CN100412962C - Optical recording device - Google Patents
Optical recording device Download PDFInfo
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- CN100412962C CN100412962C CNB2006100054045A CN200610005404A CN100412962C CN 100412962 C CN100412962 C CN 100412962C CN B2006100054045 A CNB2006100054045 A CN B2006100054045A CN 200610005404 A CN200610005404 A CN 200610005404A CN 100412962 C CN100412962 C CN 100412962C
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- sectioned lens
- sensitive surface
- lens face
- optical recording
- cut apart
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Abstract
The invention discloses an optical recording disk device which is suitable for the information recording to DVD- RAM, without unstable actions caused by crosstalk of the focusing error/ the tracking error. In an optical recording disk device, a two- focus- four-subdivision lens serves as a sensor lens. In the subdivision light interception area of a photodetector 3, according to the difference between the sum of the test signals of the subdivision light interception areas A <1>, B <2>, C<1> and D <2> and the sum of the test signals of the subdivision light interception areas A <2>, B <1>, C<2> and D <1>, the focusing error signal can be generated. Thereby, as no crosstalk of the focusing error/ the tracking error occurs, no unstable action occurs, so that the information can be recorded on the DVD-RAM reliably.
Description
Technical field
The present invention relates to carry out the regeneration of the information that optical recording write down or the optical recording device of recording of information.More particularly, relate to and be applicable to the optical recording device that DVD-RAM etc. is carried out the information record.
Background technology
As the formation that the input of optical recording is used, the motion of various formation has been proposed, but no matter adopt any formation, optical recording device all has LASER Light Source basically, photodetector, and the optical system of returning the road that constitutes the back light direct light detecting device that reflects with past the road of LASER Light Source emitting laser direct light indicator with optical recording.
In this optical recording device, according to the signal that photodetector detects, the information that the reproduced light indicator is write down simultaneously, generates focus error signal and tracking error signal.In such input, use the method for method of astigmatism as detection of focus error more.This method of astigmatism is shown in Fig. 4 (E), sensitive surface is carried out 4 to be cut apart, be divided into the the 1st, the 2nd, the 3rd, and the 4th cut apart sensitive surface A ', B ', C ', D ', according to the detection signal sum of cutting apart sensitive surface A ', C ' and detection signal sum poor of cutting apart sensitive surface B ', D ', generate focus error signal.That is, shown in Fig. 4 (D), (F), utilize when departing from focusing state, cut apart the detection signal sum of sensitive surface A ', C ' and the fact of the balance destruction of the detection signal sum of cutting apart sensitive surface B ', D ', generate focus error signal.
Here, the recording optical recording of DVD-RAM etc. just forms the structure of tracking with guiding groove in advance before record, even the optical recording before the record, if, also just can generate tracking error signal with the push-pull signal of tracking with the guiding groove generation.Here, the diffraction light that takes place with guiding groove by tracking arrives 4 of photodetector and cuts apart sensitive surface and obtain push-pull signal.
Yet.Because the manufacture deviation of optical recording device and the manufacture deviation of optical recording, often tracking does not have appropriate orientation with the diffraction light that guiding groove takes place, and can not arrive the 4 appropriate positions of cutting apart sensitive surface.As a result, the push-pull signal focus error signal that bleeds is often arranged, at this moment, can not generate suitable focus error signal.This cross (talk) is called focusing error/tracking error cross (talk), and it makes the focus servo action unstable, also makes and searches the action instability.Therefore, the problem of existence is, is necessary the gain setting compensation etc. when servo, though originally when driving regeneration with optical recording with simpler servo condition as necessary condition, can not reach this condition.
Summary of the invention
In view of the above problems, the object of the present invention is to provide and do not take place, be suitable for the optical recording device that the information to DVD-RAM etc. writes down because of the action of instability that focusing error/the tracking error cross (talk) causes.
For solving above-mentioned problem, optical recording device of the present invention, has LASER Light Source, photodetector, and the described LASER Light Source emitting laser of formation guiding is to the past road and the optical system of returning road of the back light that guides described optical recording reflection to photodetector of optical recording, signal according to described photodetector detection, generate focus error signal and tracking error signal, wherein, described optical system is returned in the road position to possess focal length different and have a sensor leads that described back light light beam is directed to a plurality of sectioned lens faces of the diverse location on the described photodetector described, described photodetector has a plurality of sensitive surfaces of each back light that receives described a plurality of sectioned lens face guiding, according to these a plurality of sensitive surfaces be subjected to the light result, generate described focus error signal.
Promptly, the present invention is adopting according to the comparative result that is directed to the described back light beam size of described photodetector, generate described focus error signal the beam size method in the middle of, position in the described way of returning the road, configuration has the different and sensor leads that described back light light beam is directed to a plurality of sectioned lens faces of the diverse location on the described detecting device of focal length.Therefore, even because of the manufacture deviation of optical recording device or the manufacture deviation of optical recording cause that tracking does not have suitable orientation with guiding groove generation diffraction light, when not reaching the appropriate position of photodetector, the push-pull signal focus error signal that also do not bleed.Thereby, owing to do not take place because of the instability action that focusing error/the tracking error cross (talk) causes, so can be in DVD-RAM with the information reliable recording.
Among the present invention, can adopt to comprise 2 the sectioned lens faces of border along the tracking direction of described optical recording and the side extension in the direction of beating, as described a plurality of sectioned lens faces, and the different formation of the focal length of these 2 sectioned lens faces.
Among the present invention, can adopt to comprise the border along 2 sectioned lens faces that extend in the tracking direction of described optical recording, as described a plurality of sectioned lens faces, and the different formation of the focal length of these 2 sectioned lens faces.
Among the present invention, described sensor leads can adopt for example following formation, possesses the 1st of matrix pattern arrangement, the 2nd, the the 3rd and the 4th sectioned lens face is as described a plurality of sectioned lens faces, simultaneously, the border of described the 1st sectioned lens face and described the 2nd sectioned lens face, border with described the 3rd sectioned lens face and described the 4th sectioned lens face, the direction of beating along described optical recording is extended, the border of described the 1st sectioned lens face and described the 4th sectioned lens face, border with described the 2nd sectioned lens face and described the 3rd sectioned lens face, tracking direction along described optical recording is extended, the 1st, the 2nd, in the 3rd and the 4th sectioned lens face, the focal length of the 1st and the 3rd sectioned lens face that is positioned at diagonal position is consistent, the focal length of the 2nd and the 4th sectioned lens face that is positioned at diagonal position is consistent, and the described the 1st is different with the described the 2nd and the focal length of the 4th sectioned lens face with the focal length of the 3rd sectioned lens face.
Be preferably, among the present invention, the described back light light beam of described the 1st sectioned lens face outgoing, described back light light beam with described the 3rd sectioned lens face outgoing, on direction at least a portion position overlapped of beating of optical recording described in the described photodetector, be received, the described back light light beam of described the 2nd sectioned lens face outgoing, with the described back light light beam of described the 4th sectioned lens face outgoing, on direction at least a portion position overlapped of beating of optical recording described in the described photodetector, be received.
Be preferably, among the present invention, in the middle of each sectioned lens face of more described sensor leads is directed to the described back light beam size of described photodetector, described photodetector possesses the matrix pattern arrangement, receive described sensor leads outgoing described back light light beam the 1st, the 2nd, the the 3rd and the 4th sensitive surface, as described a plurality of sensitive surfaces, simultaneously, the border of described the 1st sensitive surface and described the 2nd sensitive surface, border with described the 3rd sensitive surface and described the 4th sensitive surface, the direction of beating along described optical recording is extended, the border of described the 1st sensitive surface and described the 4th sensitive surface, border with described the 2nd sensitive surface and described the 3rd sensitive surface, extend along the tracking direction of described optical recording, described the 1st sensitive surface comprises, is positioned at the 1st of the opposition side of the border side of described the 2nd sensitive surface to cut apart light area A
1, be positioned at this borderline region side the 2nd cut apart light area A
2, described the 2nd sensitive surface comprises, is positioned at the 1st of the border side of described the 1st sensitive surface to cut apart light area B
1, be positioned at its opposition side the 2nd cut apart light area B
2, described the 3rd sensitive surface comprises, is positioned at the 1st of the border side of described the 4th sensitive surface to cut apart light area C
1, be positioned at its opposition side the 2nd cut apart light area C
2, described the 4th sensitive surface comprises, is positioned at the 1st of the opposition side of the border side of described the 3rd sensitive surface to cut apart light area D
1, be positioned at this borderline region side the 2nd cut apart light area D
2At this moment, be preferably following formation, the described the 1st of described the 1st sensitive surface is cut apart light area A
1With the described the 2nd cut apart light area A
2The boundary line, be set in the focal position 2 five equilibriums and cut apart optically focused on the position of the bundle point of described the 1st sensitive surface, the described the 1st of described the 2nd sensitive surface is cut apart light area B
1With the described the 2nd cut apart light area B
2The boundary line, be set in the focal position 2 five equilibriums and cut apart optically focused on the position of the bundle point of described the 2nd sensitive surface, the described the 1st of described the 3rd sensitive surface is cut apart light area C
1With the described the 2nd cut apart light area C
2The boundary line, be set in the focal position 2 five equilibriums and cut apart optically focused on the position of the bundle point of described the 3rd sensitive surface, the described the 1st of described the 4th sensitive surface is cut apart light area D
1With the described the 2nd cut apart light area D
2The boundary line, be set in the focal position 2 five equilibriums and cut apart optically focused on the position of the bundle point of described the 4th sensitive surface.When such formation, just, cut apart light area A according to described a plurality of cutting apart in the light area
1, B
2, C
1, D
2Detection signal and, and cut apart light area A
2, B
1, C
2, D
1Detection signal and poor, can generate described focus error signal.
Under the situation of this formation, as long as in described a plurality of cutting apart in the light area, according to cutting apart light area A
1, A
2, D
1, D
2Detection signal and, and cut apart light area B
1, B
2, C
1, C
2, detection signal and poor, generate described tracking error signal and just can.
The present invention is adopting according to the comparative result that is directed to the described back light beam size of described photodetector, generate described focus error signal the beam size method in the middle of, position in the described way of returning the road, it is different that configuration has focal length, and described back light light beam is directed to the sensor leads of a plurality of sectioned lens faces of the diverse location on the described detecting device.Therefore, even because of the manufacture deviation of optical recording device or the manufacture deviation of optical recording cause that tracking does not have suitable orientation with guiding groove generation diffraction light, when not reaching the appropriate position of photodetector, the push-pull signal focus error signal that also do not bleed.Thereby, owing to do not take place because of the instability action that focusing error/the tracking error cross (talk) causes, so can be in DVD-RAM with the information reliable recording.
Description of drawings
The formation key diagram of major part of the optical recording device of example 1 of the present invention is shown to Fig. 1 pattern.
Fig. 2 (A), (B) illustrate to pattern the planimetric map of sensor leads of the recording disk apparatus that is used for example 1 of the present invention and the key diagram that cut-open view constitutes thereof respectively.
Fig. 3 illustrates in the optical recording device of example 1 of the present invention back light from optical recording by the key diagram of sensor leads optically focused in the appearance of photodetector.
Fig. 4 (A)～(C) illustrates the key diagram that the sensitive surface of the photodetector of the optical recording device that is used for example 1 of the present invention constitutes, and the key diagram that the photodetector sensitive surface when adopting method of astigmatism in the optical recording device of example in the past constitutes (D)～(F) is shown.
The key diagram of the influence when Fig. 5 (A)～(C) illustrates the optical recording device that is used for example 1 of the present invention and comprises astigmatic image error from the back light of optical recording, the key diagram of the influence when back light from optical recording (D)～(F) being shown in the optical recording device of example in the past comprising astigmatic image error.
The formation key diagram of major part of the optical recording device of example 2 of the present invention is shown to Fig. 6 pattern.
Fig. 7 (A)～(C) illustrates the key diagram that the sensitive surface of the photodetector of the optical recording device that is used for example 2 of the present invention constitutes.
Fig. 8 illustrates in the optical recording device of another example of the present invention from the back light of the optical recording key diagram by the sensitive surface of sensor leads optically focused when the photodetector.
Fig. 9 is the key diagram of the optical recording device of another example of the present invention.
Label declaration
1 optical recording device, 2 LASER Light Source, 3 photodetectors
10 optical recordings, 20 optical systems, 25 sensor leads
25A, 25B, 25C, 25D sectioned lens face
26 grating A, B, C, D sensitive surface
Embodiment
With reference to description of drawings example of the present invention.Among the figure, be purpose, represent the tracking direction, with arrow J (tangent line) direction of representing to beat with arrow Tr with the pass, position of the sensitive surface of the position relation of sectioned lens face that sensor leads is shown and optical recording and light-receiving device and optical recording.
[example 1]
(overall formation)
Fig. 1 for pattern the formation key diagram of major part of the optical recording device of example 1 of the present invention is shown.
Among Fig. 1, the optical recording device 1 of this form has and for example sends the LASER Light Source 2 that wavelength is the laser beam of 650nm, and photodetector 3.In addition, optical recording device 1, from LASER Light Source 2 to optical recording 10, have the optical system 20 that comprises beam splitter 21, collimation lens 22, rising catoptron 23 and object lens 24, utilize this optical system to constitute and will be directed to the past road of optical recording 10 from LASER Light Source 2 emitting lasers.In addition, optical system 20 has sensor leads 25 between beam splitter 21 and photodetector 3, be made of the road of returning that the back light of optical recording reflection is directed to photodetector 3 object lens 24, rising catoptron 23, collimation lens 22, beam splitter 21 and sensor leads 25.Photodetector 3 is when back light that detects the optical recording reflection and recorded information, or when carrying out information regeneration, with generating focus error signal and tracking error signal, and these focus error signals and tracking error signal are fed back to objective lens device (not shown).
In addition, display monitor central monitoring system 4 (display monitor central monitoring system photodetector) before the configuration of the behind of rising catoptron 23 is used for detecting the light that leaks from rising catoptron 23 from LASER Light Source 2 biographies to the laser of optical recording 10.
(formation of signal detection system)
Fig. 2 (A), (B) illustrate to pattern the planimetric map of sensor leads of the recording disk apparatus that is used for example 1 of the present invention and the key diagram that cut-open view constitutes thereof respectively.Fig. 3 illustrates in the optical recording device of example 1 of the present invention back light from optical recording by the key diagram of sensor leads optically focused in the appearance of photodetector.Fig. 4 (A)～(C) illustrates the key diagram that the sensitive surface of the photodetector of the optical recording device that is used for example 1 of the present invention constitutes.The key diagram of the influence the when key diagram of the influence when Fig. 5 (A)～(C) illustrates the optical recording device that is used for example 1 of the present invention and comprises astigmatic image error from the back light of optical recording, Fig. 5 (D)～(F) illustrate in the optical recording device of example in the past back light from optical recording and comprise astigmatic image error.
In the optical recording device 1 shown in Figure 1, sensor leads 25 is 2 focuses, 4 sectioned lens, as shown in Figures 2 and 3, have the 1st, the 2nd, the 3rd and the 4th sectioned lens face 25A, 25B, 25C and the 25D that are arranged in matrix pattern, the boundary member of each sectioned lens face 25A, 25B, 25C, 25D forms the step discrepancy in elevation.Here, the cut-off rule L11 of sensor leads 25, the direction of L12 is orthogonal, in this example, dispose a side the cut-off rule L11 (border of the 1st sectioned lens face 25A and the 2nd sectioned lens face 25B, and the border of the 3rd sectioned lens face 25C and the 4th sectioned lens face 25D) parallels with the tangential direction (direction of beating of optical recording) of the track of optical recording 10, the tangential direction (the tracking direction of optical recording 10) of the track of configuration the opposing party's cut-off rule L12 (border of the 1st sectioned lens face 25A and the 4th sectioned lens face 25D, and the border of the 2nd sectioned lens face 25B and the 3rd sectioned lens face 25C) and optical recording 10 is quadrature mutually.
1st, the 2nd, the 3rd and the 4th sectioned lens face 25A, 25B, 25C and 25D, all has positive power of lens, but the 1st sectioned lens face 25A that is positioned at diagonal position is consistent with the 3rd sectioned lens face 25C focal length, and the 2nd sectioned lens face 25B that is positioned at diagonal position is consistent with the 4th sectioned lens face 25D focal length.In addition, the focal length of the 1st sectioned lens face 25A and the 3rd sectioned lens face 25C, different with the focal length of the 2nd sectioned lens face 25B and the 4th sectioned lens face 25D.
Therefore, as shown in Figure 3, to the photodetector emitting laser, focus in the inboard of photodetector 3 from the 1st and the 3rd sectioned lens face 25A, 25C.Relative therewith,, focus on to photodetector 3 emitting lasers from the 2nd and the 4th sectioned lens face 25B, 25D in the front of photodetector 3.
Shown in Fig. 4 (A)～(C), that photodetector 3 possesses is that matrix pattern is arranged, receive the 1st, the 2nd, the 3rd and the 4th sensitive surface A, B, C, D by the back light light beam of the described the 1st, the 2nd, the 3rd and the 4th sectioned lens face 25A, 25B, 25C, 25D guiding, as a plurality of sensitive surfaces.Here, the border of the border of the 1st sensitive surface A and the 2nd sensitive surface B and the 3rd sensitive surface C and the 4th sensitive surface D, the direction of beating along optical recording is extended, extend along the tracking direction of optical recording on the border of the border of the 1st sensitive surface A and the 4th sensitive surface D and the 2nd sensitive surface B and the 3rd sensitive surface C.Therefore, the back light light beam of the 1st sectioned lens face 25A outgoing is received by the 4th sensitive surface D, the back light light beam of the 2nd sectioned lens face 25B outgoing is received by the 2nd sensitive surface B, the back light light beam of the 3rd sectioned lens face 25C outgoing is received by the 3rd sensitive surface C, and the back light light beam of the 4th sectioned lens face 25D outgoing is received by the 1st sensitive surface A.
In addition, the 1st sensitive surface A has to be positioned at the 1st of the opposition side of the border side of the 2nd sensitive surface B and cuts apart light area A
1And be positioned at the 2nd of borderline region side and cut apart light area A
2The 2nd sensitive surface B has to be positioned at the 1st of the border side of the 1st sensitive surface A and cuts apart light area B
1And its opposition side the 2nd cut apart light area B
2The 3rd sensitive surface C has to be positioned at the 1st of the border side of the 4th sensitive surface D and cuts apart light area C
1And its opposition side the 2nd cut apart light area C
2The 4th sensitive surface D has to be positioned at the 1st of the opposition side of the border side of the 3rd sensitive surface C and cuts apart light area D
1And be positioned at the 2nd of borderline region side and cut apart light area D
2
Here, the 1st of the 1st sensitive surface A the cuts apart light area A
1With the 2nd cut apart light area A
2The boundary line, be set in the focal position 2 five equilibriums and cut apart optically focused on the position of the bundle point of the 1st sensitive surface A, the 1st of the 2nd sensitive surface B is cut apart light area B
1With the 2nd cut apart light area B
2The boundary line, be set in the focal position 2 five equilibriums and cut apart optically focused on the position of the bundle point of the 2nd sensitive surface B, the 1st of the 3rd sensitive surface C is cut apart light area C
1With the 2nd cut apart light area C
2The boundary line, be set in the focal position 2 five equilibriums and cut apart optically focused on the position of the bundle point of the 3rd sensitive surface C, the 1st of the 4th sensitive surface D is cut apart light area D
1With the 2nd cut apart light area D
2The boundary line, be set in the focal position 2 five equilibriums and cut apart optically focused on the position of the bundle point of the 4th sensitive surface D.
The photodetector 3 of Gou Chenging at 4 sensitive surface A, B, when C, D focus separately, forms such wave beam shown in Fig. 4 (B) like this, in the distally during non-focusing, form such wave beam shown in Fig. 4 (A), when the non-focusing of nearside, form such wave beam shown in Fig. 4 (C).
Therefore, cut apart in the light area being formed at a plurality of of photodetector 3, can be according to cutting apart light area A
1, B
2, C
1, D
2Detection signal and, and cut apart light area A
2, B
1, C
2, D
1Detection signal and poor, generate focus error signal.That is to say that intactly hypothesis is cut apart light area A
1, A
2, B
1, B
1, C
1, C
2, D
1, D
2Each self-monitoring signal is A
1, A
2, B
1, B
2, C
1, C
2, D
1, D
2, then available following formula
(A
1+B
2+C
1+D
2)-(A
2+B
1+C
2+D
1)
Obtain focus error signal.
Relative therewith, when asking tracking error signal, as long as use following formula with the method for recommending
(A
1+A
2+D
1+D
2)-(B
1+B
2+C
1+C
2)
Generating tracking error signal just can.
In addition, when optical recording 10 carries out information regeneration, information can be utilized following formula
(A
1+A
2+B
1+B
2+C
1+C
2+D
1+D
2)
Regenerate.
(the main effect of this example)
So, in the optical recording device 1 of this form, adopting according to the comparative result that is directed to the back light beam size of described photodetector 3, generate described focus error signal the beam size method in the middle of, position in the described way of returning the road, it is different that configuration has a focal length, and the back light light beam is directed to a plurality of sectioned lens face 25A, 25B, the 25C of the diverse location on the detecting device 3, the sensor leads of 25D.Therefore, as reference Fig. 5 aftermentioned, even because of the manufacture deviation of optical recording device 1 or the manufacture deviation of optical recording 10 cause that tracking does not have suitable orientation with guiding groove generation diffraction light, when not reaching the appropriate position of sensitive surface, focusing error/tracking error cross (talk) does not take place yet, so can carry out the focus servo action with stable status, also can search action with stable status.In addition, also there is no need gain setting compensation when servo.Therefore, in the middle of the information record that carries out DVD-RAM etc., can realize simpler servo condition when driving regeneration with optical recording.
In addition, in this example, because with 2 focuses, 4 sectioned lens with the 1st, the 2nd, the 3rd and the 4th the sectioned lens face 25A that is arranged in matrix pattern, 25B, 25C, 25D, therefore on photodetector 3, form 4 wave beams and independently restraint a little separately, thereby 4 sensitive surface A, B, C, the D direction separately of photodetector 3 easily can be adjusted on the sensor leads 25.
Fig. 5 (A), (B), (C) illustrate the optical recording device 1 of this example respectively in the state of state that astigmatic image error does not take place and generation astigmatic image error, restraint under the situation of the track inboard that is formed at optical recording 10, restraint under the situation of the track central authorities that are formed at optical recording 10, and restraint under the situation in the track that is formed at optical recording 10 outside, the bundle point is formed at the appearance on the photodetector 3.Fig. 5 (D), (E), (F) illustrate respectively in the state of state that astigmatic image error does not take place and generation astigmatic image error, restraint under the situation of the track inboard that is formed at optical recording 10, restraint under the situation of the track central authorities that are formed at optical recording 10, and restraint under the situation in the track that is formed at optical recording 10 outside, the bundle point is formed at the appearance on the photodetector.This is the situation of example in the past, according to the detection signal sum of cutting apart sensitive surface A ', C ', with the detection signal of cutting apart sensitive surface B ', D ' this and difference generate focus error signal, according to another the detection signal sum of cutting apart sensitive surface A ', D ', with the difference generation tracking error signal of the detection signal sum of cutting apart sensitive surface B ', C '.
Among Fig. 5, because astigmatism with the zone of representing in vain entirely to brighten, is represented the zone of deepening with the both sides of right oblique line and left oblique line.
Comparison diagram 5 (A)～(C) and Fig. 5 (D)～(F) are as seen, adopt the situation of this form mode to be different from the employing situation of routine mode in the past, carrying out when calculating the calculation of focus error signal, the result that the light and shade that causes because of astigmatism is cancelled, light and shade do not make a difference to the result that calculates of focus error signal.Therefore, focus error signal/tracking error signal cross (talk) does not take place.
For example, in DVD-RAM (optical recording 10), the state that is positioned on the groove with the center of restrainting point is a normal condition, halved tie point whenever departs from this reference position and moves between the 0.37 μ m (spacing of track) to the inboard and the outside of optical recording 10, utilize analogy method to obtain the result of the ratio of focus error signal contained in the push-pull signal (with the value that focusing error/the tracking error cross (talk) is corresponding), can confirm, with be 8% relative in the mode of the example in the past shown in Fig. 4 (D)～(F) and Fig. 5 (D)～(F), if adopt Fig. 4 (A)～(C) and the mode of the present invention shown in Fig. 5 (A)～(C) can be reduced to 3%.
[example 2]
Fig. 6 illustrates the key diagram of major part formation of the optical recording device of example 2 of the present invention for pattern ground.Fig. 7 illustrates in the optical recording device of example 2 of the present invention from the back light of the optical recording key diagram by the appearance of sensor leads optically focused on photodetector.In addition, because of the optical recording device of this form is identical with the basic comprising of the optical recording device of example 1, thus the identical identical label of part mark is illustrated, and omit its explanation.
Among Fig. 6, the optical recording device 1 of this form is also used the optical system same with example 1, constitutes the road of returning that LASER Light Source 2 emitting lasers is directed at past the road of optical recording 10 and the back light that optical recording 10 reflects is directed at photodetector 3.
Here, sensor leads 25 is as illustrated with reference to Fig. 2 and Fig. 3, be 2 focuses, 4 sectioned lens, have the 1st, the 2nd, the 3rd and the 4th sectioned lens face 25A, 25B, 25C and the 25D that are arranged in matrix pattern, the boundary member of each sectioned lens face 25A, 25B, 25C, 25D forms the step discrepancy in elevation.1st, the 2nd, the 3rd and the 4th sectioned lens face 25A, 25B, 25C and 25D have positive power of lens, but the 1st sectioned lens face 25A that is positioned at diagonal position is consistent with the 3rd sectioned lens face 25C focal length, and the 2nd sectioned lens face 25B that is positioned at diagonal position is consistent with the 4th sectioned lens face 25D focal length.In addition, the focal length of the 1st sectioned lens face 25A and the 3rd sectioned lens face 25C, with the focal length of the 2nd sectioned lens face 25B and the 4th sectioned lens face 25D, and inequality.Therefore, as shown in Figure 3, to the photodetector emitting laser, focus in the inboard of photodetector 3 from the 1st and the 3rd sectioned lens face 25A, 25C.Relative therewith,, focus on to photodetector 3 emitting lasers from the 2nd and the 4th sectioned lens face 25B, 25D in the front of photodetector 3.
In this example, adopt 3 wave beam methods of tracking error signal, as shown in Figure 6, configuration grating 26 between LASER Light Source 2 and beam splitter 21.Therefore, in this form, shown in Fig. 7 (A), (B), (C), photodetector 3 by the 1st photo detector 31 that receives the beamlet that+1 rank diffraction light constitutes, receive 0 rank light the 2nd photo detector 32, and the 3rd photo detector 33 that receives-1 rank diffraction light constituted.
In these photo detectors 31,32,32, photodetector 32 is identical with example 1, possess that matrix pattern is arranged, receive the 1st, the 2nd, the 3rd and the 4th sensitive surface A, B, C, D, as a plurality of sensitive surfaces by the back light light beam of the described the 1st, the 2nd, the 3rd and the 4th sectioned lens face 25A, 25B, 25C, 25D guiding.In addition, the 1st sensitive surface A has to be positioned at the 1st of the opposition side of the border side of the 2nd sensitive surface B and cuts apart light area A
1And be positioned at the 2nd of borderline region side and cut apart light area A
2The 2nd sensitive surface B has to be positioned at the 1st of the border side of the 1st sensitive surface A and cuts apart light area B
1And its opposition side the 2nd cut apart light area B
2The 3rd sensitive surface C has to be positioned at the 1st of the border side of the 4th sensitive surface D and cuts apart light area C
1And its opposition side the 2nd cut apart light area C
2The 4th sensitive surface D has to be positioned at the 1st of the opposition side of the border side of the 3rd sensitive surface C and cuts apart light area D
1And be positioned at the 2nd of borderline region side and cut apart light area D
2Here, the 1st of the 1st sensitive surface A the cuts apart light area A
1With the 2nd cut apart light area A
2The boundary line, be set in the 1st sensitive surface A done on the position that 2 five equilibriums cut apart, the 1st of the 2nd sensitive surface B is cut apart light area B
1With the 2nd cut apart light area B
2The boundary line, be set in the 2nd sensitive surface B done on the position that 2 five equilibriums cut apart, the 1st of the 3rd sensitive surface C is cut apart light area C
1With the 2nd cut apart light area C
2The boundary line, be set in the 3rd sensitive surface C done on the position that 2 five equilibriums cut apart, the 1st of the 4th sensitive surface D is cut apart light area D
1With the 2nd cut apart light area D
2The boundary line, be set in the 4th sensitive surface D done on the position that 2 five equilibriums cut apart.
The photodetector 3 of Gou Chenging at 4 sensitive surface A, B, when C, D focus separately, forms such light beam shown in Fig. 7 (B) like this, in the distally during non-focusing, form such light beam shown in Fig. 7 (A), when the non-focusing of nearside, form such light beam shown in Fig. 7 (C).
Therefore, cut apart in the light area a plurality of of the photo detector 32 that is formed at photodetector 3, can be according to cutting apart light area A
1, B
2, C
1, D
2Detection signal and, and cut apart light area A
2, B
1, C
2, D
1Detection signal and poor, generate focus error signal.That is to say that intactly hypothesis is cut apart light area A
1, A
2, B
1, B
2, C
1, C
2, D
1, D
2Each self-monitoring signal is A
1, A
2, B
1, B
2, C
1, C
2, D
1, D
2, then available following formula
(A
1+B
2+C
1+D
2)-(A
2+B
1+C
2+D
1)
Obtain focus error signal.
In addition, tracking error signal also can adopt aforementioned any of method and 3 wave beam methods of recommending.In addition, as shown in Figure 7, because in the photodetector, the 1st photo detector 31 of the beamlet that reception+1 rank diffraction light constitutes and the 3rd photo detector 33 of reception-1 rank diffraction light also carry out 4 to be cut apart, therefore also available DPP method detects tracking error signal.
[other examples]
Above-mentioned form 1, in 2, the light receiving position at the 4th sensitive surface D of the back light light beam of the 1st sectioned lens face 25A outgoing, light receiving position with the back light light beam of the 3rd sectioned lens face 25C outgoing at the 3rd sensitive surface C, on the direction of beating, depart from fully, and, the light receiving position at the 2nd sensitive surface B of the back light light beam of the 2nd sectioned lens face 25B outgoing, light receiving position with the back light light beam of the 4th sectioned lens face 25D outgoing at the 1st sensitive surface A, on the direction of beating, depart from fully, but also can constitute each sectioned lens face 25A of sensor leads, 25B, 25C, 25D, back light during as shown in Figure 8 focusing be subjected to light state such, make the light receiving position at the 4th sensitive surface D of the back light light beam of the 1st sectioned lens face 25A outgoing, light receiving position with the back light light beam of the 3rd sectioned lens face 25C outgoing at the 3rd sensitive surface C, direction top is overlapping beating, and, the light receiving position at the 2nd sensitive surface B of the back light light beam of the 2nd sectioned lens face 25B outgoing, with the light receiving position at the 1st sensitive surface A of the back light light beam of the 4th sectioned lens face 25D outgoing, direction top is overlapping beating.
In addition, though it is not shown, but also can constitute each sectioned lens face 25A of sensor leads, 25B, 25C, 25D, make the light receiving position at the 4th sensitive surface D of the back light light beam of the 1st sectioned lens face 25A outgoing, light receiving position with the back light light beam of the 3rd sectioned lens face 25C outgoing at the 3rd sensitive surface C, overlapping fully on the direction of beating, and, the light receiving position at the 2nd sensitive surface B of the back light light beam of the 2nd sectioned lens face 25B outgoing, with the light receiving position at the 1st sensitive surface A of the back light light beam of the 4th sectioned lens face 25D outgoing, overlapping fully on the direction of beating.
Adopt any form wherein, all have the sensitive surface area that can dwindle photodetector 3, and make the advantage of photodetector miniaturization, cost degradation.
In addition, in the above-mentioned form,, adopt 2 focuses, 4 sectioned lens, but also can shown in Fig. 9 (A), adopt with 1 cut-off rule L1 and make 22 focuses, 2 sectioned lens of cutting apart as sensor leads 25.At this moment, because the light beam of formation shown in Fig. 9 (B), so can utilize following formula according to the sensitive surface A of photodetector 3, the testing result of D
(A
1+D
2)-(A
2+D
1)
Generate focus signal.
In addition, also can shown in Fig. 9 (A), adopt with 1 cut-off rule L2 and make 22 focuses, 2 sectioned lens of cutting apart.At this moment, because the light beam of formation shown in Fig. 9 (C), so can utilize following formula according to sensitive surface A, the B of photodetector 3, the testing result of C, D
(A
1+B
2+C
1+D
2)-(A
2+B
1+C
2+D
1)
Generate focus signal.
Claims (10)
1. an optical recording device has
LASER Light Source,
Photodetector and
Constitute the past road and the back light that guide described optical recording reflection the optical system of returning road to photodetector of the described LASER Light Source emitting laser of guiding to optical recording,
Signal according to described photodetector detects generates focus error signal and tracking error signal,
It is characterized in that,
Described optical system is returned in the road position to possess focal length different and have a sensor leads that described back light light beam is directed to a plurality of sectioned lens faces of the diverse location on the described photodetector described,
Described photodetector has a plurality of sensitive surfaces of each back light that receives described a plurality of sectioned lens face guiding,
According to these a plurality of sensitive surfaces respectively be subjected to the light result, generate described focus error signal.
2. optical recording device as claimed in claim 1 is characterized in that,
Be directed to the comparative result of the described back light beam size of described photodetector according to each sectioned lens face of described sensor leads, generate described focus error signal.
3. optical recording device as claimed in claim 2 is characterized in that,
Comprise 2 the sectioned lens faces of border along the tracking direction of described optical recording and the side extension in the direction of beating, as described a plurality of sectioned lens faces, and the focal length difference of these 2 sectioned lens faces.
4. optical recording device as claimed in claim 3 is characterized in that,
Comprise 2 sectioned lens faces that extend along the tracking direction of described optical recording on the border, as described a plurality of sectioned lens faces, and the focal length difference of these 2 sectioned lens faces.
5. optical recording device as claimed in claim 4 is characterized in that,
Described sensor leads possesses the 1st, the 2nd, the 3rd and the 4th sectioned lens face that matrix pattern is arranged, as described a plurality of sectioned lens faces, simultaneously,
Extend along the direction of beating of described optical recording on the border of the border of described the 1st sectioned lens face and described the 2nd sectioned lens face and described the 3rd sectioned lens face and described the 4th sectioned lens face,
Extend along the tracking direction of described optical recording on the border of the border of described the 1st sectioned lens face and described the 4th sectioned lens face and described the 2nd sectioned lens face and described the 3rd sectioned lens face,
1st, in the 2nd, the 3rd and the 4th sectioned lens face, the focal length of the 1st and the 3rd sectioned lens face that is positioned at diagonal position is consistent, and the focal length of the 2nd and the 4th sectioned lens face that is positioned at diagonal position is consistent, and,
The described the 1st is different with the described the 2nd and the focal length of the 4th sectioned lens face with the focal length of the 3rd sectioned lens face.
6. optical recording device as claimed in claim 5 is characterized in that,
The described back light light beam of the described back light light beam of described the 1st sectioned lens face outgoing and described the 3rd sectioned lens face outgoing is received on direction at least a portion position overlapped of beating of optical recording described in the described photodetector,
The described back light light beam of the described back light light beam of described the 2nd sectioned lens face outgoing and described the 4th sectioned lens face outgoing is received on direction at least a portion position overlapped of beating of optical recording described in the described photodetector.
7. optical recording device as claimed in claim 4 is characterized in that,
Described photodetector possesses the 1st, the 2nd, the 3rd and the 4th sensitive surface matrix pattern arrangement, that receive the described back light light beam of described sensor leads outgoing, as described a plurality of sensitive surfaces, simultaneously,
Extend along the direction of beating of described optical recording on the border of the border of described the 1st sensitive surface and described the 2nd sensitive surface and described the 3rd sensitive surface and described the 4th sensitive surface,
Extend along the tracking direction of described optical recording on the border of the border of described the 1st sensitive surface and described the 4th sensitive surface and described the 2nd sensitive surface and described the 3rd sensitive surface,
Described the 1st sensitive surface comprises, is positioned at the 1st of the opposition side of the border side of described the 2nd sensitive surface to cut apart light area A
1, be positioned at this borderline region side the 2nd cut apart light area A
2,
Described the 2nd sensitive surface comprises, is positioned at the 1st of the border side of described the 1st sensitive surface to cut apart light area B
1, be positioned at its opposition side the 2nd cut apart light area B
2,
Described the 3rd sensitive surface comprises, is positioned at the 1st of the border side of described the 4th sensitive surface to cut apart light area C
1, be positioned at its opposition side the 2nd cut apart light area C
2,
Described the 4th sensitive surface comprises, is positioned at the 1st of the opposition side of the border side of described the 3rd sensitive surface to cut apart light area D
1, be positioned at this borderline region side the 2nd cut apart light area D
2,
According to described a plurality of cutting apart in the light area, cut apart light area A
1, B
2, C
1, D
2The detection signal sum with cut apart light area A
2, B
1, C
2, D
1Detection signal sum poor, generate described focus error signal.
8. optical recording device as claimed in claim 7 is characterized in that,
According to described a plurality of cutting apart in the light area, cut apart light area A
1, A
2, D
1D
2The detection signal sum with cut apart light area B
1, B
2, C
1, C
2Detection signal sum poor, generate described tracking error signal.
9. optical recording device as claimed in claim 7 is characterized in that,
The described the 1st of described the 1st sensitive surface is cut apart light area A
1With the described the 2nd cut apart light area A
2The boundary line, be set in the focal position 2 five equilibriums and cut apart optically focused on the position of the bundle point of described the 1st sensitive surface,
The described the 1st of described the 2nd sensitive surface is cut apart light area B
1With the described the 2nd cut apart light area B
2The boundary line, be set in the focal position 2 five equilibriums and cut apart optically focused on the position of the bundle point of described the 2nd sensitive surface,
The described the 1st of described the 3rd sensitive surface is cut apart light area C
1With the described the 2nd cut apart light area C
2The boundary line, be set in the focal position 2 five equilibriums and cut apart optically focused on the position of the bundle point of described the 3rd sensitive surface,
The described the 1st of described the 4th sensitive surface is cut apart light area D
1With the described the 2nd cut apart light area D
2The boundary line, be set in the focal position 2 five equilibriums and cut apart optically focused on the position of the bundle point of described the 4th sensitive surface.
10. optical recording device as claimed in claim 7 is characterized in that,
Described sensor leads possesses the 1st, the 2nd, the 3rd and the 4th sectioned lens face that matrix pattern is arranged, as described a plurality of sectioned lens faces, simultaneously,
Extend along the direction of beating of described optical recording on the border of the border of described the 1st sectioned lens face and described the 2nd sectioned lens face and described the 3rd sectioned lens face and described the 4th sectioned lens face,
Extend along the tracking direction of described optical recording on the border of the border of described the 1st sectioned lens face and described the 4th sectioned lens face and described the 2nd sectioned lens face and described the 3rd sectioned lens face,
1st, in the 2nd, the 3rd and the 4th sectioned lens face, the focal length of the 1st and the 3rd sectioned lens face that is positioned at diagonal position is consistent, and the focal length of the 2nd and the 4th sectioned lens face that is positioned at diagonal position is consistent, and,
The described the 1st is different with the described the 2nd and the focal length of the 4th sectioned lens face with the focal length of the 3rd sectioned lens face.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005012109 | 2005-01-19 | ||
| JP2005012109 | 2005-01-19 | ||
| JP2005194953 | 2005-07-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1808587A CN1808587A (en) | 2006-07-26 |
| CN100412962C true CN100412962C (en) | 2008-08-20 |
Family
ID=36840434
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100054045A Expired - Fee Related CN100412962C (en) | 2005-01-19 | 2006-01-17 | Optical recording device |
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|---|---|
| CN (1) | CN100412962C (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02226521A (en) * | 1989-02-28 | 1990-09-10 | Olympus Optical Co Ltd | Focal point detector |
| JPH076380A (en) * | 1993-06-15 | 1995-01-10 | Nikon Corp | Optical head |
| JP2002056550A (en) * | 2000-08-04 | 2002-02-22 | Sharp Corp | Optical pickup, information recording/reproducing device and information recording/reproducing method using its pickup |
| US6430141B1 (en) * | 1998-04-14 | 2002-08-06 | Thomson Licensing, S.A. | Device for reading from or writing to optical recording media |
| US6801491B1 (en) * | 1999-02-24 | 2004-10-05 | Pioneer Corporation | Focus error detecting apparatus of optical pickup with a light separating and astigmatism generation optical element and detection method thereof |
-
2006
- 2006-01-17 CN CNB2006100054045A patent/CN100412962C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02226521A (en) * | 1989-02-28 | 1990-09-10 | Olympus Optical Co Ltd | Focal point detector |
| JPH076380A (en) * | 1993-06-15 | 1995-01-10 | Nikon Corp | Optical head |
| US6430141B1 (en) * | 1998-04-14 | 2002-08-06 | Thomson Licensing, S.A. | Device for reading from or writing to optical recording media |
| US6801491B1 (en) * | 1999-02-24 | 2004-10-05 | Pioneer Corporation | Focus error detecting apparatus of optical pickup with a light separating and astigmatism generation optical element and detection method thereof |
| JP2002056550A (en) * | 2000-08-04 | 2002-02-22 | Sharp Corp | Optical pickup, information recording/reproducing device and information recording/reproducing method using its pickup |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1808587A (en) | 2006-07-26 |
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