CA1055594A - Television camera - Google Patents
Television cameraInfo
- Publication number
- CA1055594A CA1055594A CA252,952A CA252952A CA1055594A CA 1055594 A CA1055594 A CA 1055594A CA 252952 A CA252952 A CA 252952A CA 1055594 A CA1055594 A CA 1055594A
- Authority
- CA
- Canada
- Prior art keywords
- tube
- camera
- pick
- coil former
- ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/26—Image pick-up tubes having an input of visible light and electric output
- H01J31/28—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen
- H01J31/34—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having regulation of screen potential at cathode potential, e.g. orthicon
- H01J31/38—Tubes with photoconductive screen, e.g. vidicon
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
Abstract
ABSTRACT:
A television camera comprising pick-up tubes which can be provided, after the pick-up tube has been arranged in a coil former of the camera, with centering means for centering the pick-up tube in the coil former. One type of pick-up tube is thus suitable for a plurality of types of camera and can be made suitable for the relevant camera by a suitable choice of the centering means to be provided at a later stage.
A television camera comprising pick-up tubes which can be provided, after the pick-up tube has been arranged in a coil former of the camera, with centering means for centering the pick-up tube in the coil former. One type of pick-up tube is thus suitable for a plurality of types of camera and can be made suitable for the relevant camera by a suitable choice of the centering means to be provided at a later stage.
Description
p]-~N.~o~3 SC~IE/AVDV
1055594 ~6.4.76 "Television camera".
The invention relates to a method of mounting pick-up tubes in a coil housing, comprising adjusting means, of a television camera, and to a television camera assembled in accordance with this method.
Two methods are commonly used for mounting pick-up tubes in the coil housing of a I television camera, i.e. one method where the tube i is slid from the rear into a coil former in a camera of the rear-loading type, and one method where -the tube is slid from the front into a coil former in a camera of the front-loading type. The construction of these cameras is so that for each type only one method of mounting the pick-up tube is feasible;
consequently, it is necessary to have two different pick-up tubes adapted to the different camera types available. These pick-up tubes cannot be interchanged.
For the pick-up tube for the rear-1oading type it is not permissible to comprise a radially projecting structural element on the window side. This is per-missible for the front-loading type, and this possibility is utilized in that on the piCk-llp tube centering means are provided for centcring the pick-up tube in the coi] former of the camera.
1055594 ~6.4.76 "Television camera".
The invention relates to a method of mounting pick-up tubes in a coil housing, comprising adjusting means, of a television camera, and to a television camera assembled in accordance with this method.
Two methods are commonly used for mounting pick-up tubes in the coil housing of a I television camera, i.e. one method where the tube i is slid from the rear into a coil former in a camera of the rear-loading type, and one method where -the tube is slid from the front into a coil former in a camera of the front-loading type. The construction of these cameras is so that for each type only one method of mounting the pick-up tube is feasible;
consequently, it is necessary to have two different pick-up tubes adapted to the different camera types available. These pick-up tubes cannot be interchanged.
For the pick-up tube for the rear-1oading type it is not permissible to comprise a radially projecting structural element on the window side. This is per-missible for the front-loading type, and this possibility is utilized in that on the piCk-llp tube centering means are provided for centcring the pick-up tube in the coi] former of the camera.
-2- .
PI-~.8033 2G.4.76 ;
The invention has for its object to ! provide a method which enables the use of a single type of pick-up tube for both types of camera.
; To this end, a method of mounting pick-up tubes in a television camera in accordance with the invention is characterized in that, after having been arranged in the coil former, the pick-up tube is provided with centering means adapted to the adjusting means of the coil former.
Because the method in accordance with the invention enables a pick-up tube to be used in a camera of the front-loading type as well as in a camera of the rear-loading type, a distinction need no longer be made during the production of pick-up tubes, that is to say~a single type suffices in this respect.
In a preferred embodiment in accordance with the invention, the centering means to be separately fitted consists of a centering ring which can be slid about the entrance window with a suitable fit.
In a further preferred embodiment, the centering means to be separately fitted consists of a clamping ring which is clamped about the end of the cylindrical portion of the tube and hence about the signal electrode contact.
Some preferred embodiments of a television camera in accordance with the inventior. and the method ~HN.8033 26.4.76 of assembling the same will be described in detail hereinafter with ref`erence to the drawing.
Fig. 1 is a simplified diagrammatic view of the relevarlt portion of a television camera ' 5 with a pick-up tube.
: Figs. 2 and 3 show different embodiments of television camera tubes with mounting means in accordance with the invention.
Fig. 1 shows a portion relevant for the application of the invention of a television camera comprising a coil unit which includes, for example, a line deflection coil 2 and a frame deflection coil 3 ~ which are both disposed on a coil former 4. In the coil ¦ former there are provided adjusting means 5 and 6 ! 15 for securing a pick-up tube 7 in the coil former.-Thc pick-up tube, that is to say the optical axis of the pick-up tube, can be orientated, axially di~splaced and possibly rotated by means of these adjusting means. Depending on the type of camera, either the adjusting means 5, situated on the entrance side of the pick-up tube, or the adjusting means 6, situated on the tube base side of the pick-up tube,are usually shaped as a flexible ring, the said ring lightly cl~mping a cylindrical portion 8 of an envelope 9 of the pick-up tube. The adjusting means situated at the axially opposite end of the pick-up tube then comprise the necessary auxiliaries for readjustment p~.8033 2G.4.76 of the tube. These readjuL;ting means are included in many known cameras and are not shown in the drawing.
The envelope 9 furthermore comprises a tube base 25 which comprises passage pins 12, a p~mping stem 13 and an entrance window 14. The entrance window 14 may be composed of an optica] fibre plate as well as of a homogeneous glass plate. When a homogeneous glass plate is used for the entrance window, usually a front attachment is added which preferably has a thickness such that the disturbing effects of internal reflections and dust present on the inner side of the lens on the imaging are minimized. The d~meter of an entrance window thus formed is usually smaller than the diameter of the cylindrical portion 8 of the envelope. As is shown in Figs. 2 and 3, on the entrance side of the pick-up tubo there is provided a signal electrode contact 31, for example, in the form of one or a few passages which are electrically conductively connected to a contact ring 32 disposed about the entrance portion of the cylindrical housing. The pick-up tube accommodates a target plate which comprises, for example, a layer 18 of lead monoxide as the photosensitive material and a signal electrode 19 which is preferably arranged on tho entrance window. The pick-up tuhe furthermore ComprisQS a gauze electrode 21, an output electrode 22 . .
p~.8033 2G.4.7~
and an electron source 23 having a cathode 24.
The required voltages can be applied via a base 25 which may comprise a bush 26 for accommodating an auxiliary illumination source which is not shown.
Fig. 2 is a simplified diagrammatic representation of a front portion of a pick-up tube with the cylindrical tube wall portion 8 and the entrance window 1~ which both form part of the envelope of the pick-up tube. The tube accommodates the 10 signal electrode 19 and the photoconductive layer 18 of the target. The signal e]ectrode 19 is connected, via an electrically conductive glass passage 31, to the contact ring 32 fitted about the end of the cylindrical portion of the envelope. This contact 15 ring is integral with the pick-up tube and is provided, for example, by vapour-deposition, baking or an other method suitable for the deposition of a conductive ma-terial on glass. This contact ring is constructed to be so thin, also for known pick-up tubes, that the 20 tube is suitable for a camera of the rear-loading type.
However, the pick-up tube lacks the required centering means for use in a camera of the front-loading t~rpe. These means are constructed in this embodiment as a ring 33 which is preferably made 25 f synthetic material and which can be slid about the front attachment of the entrance window in a clamping fashion. The tube then remains suitable for p~.8033 26.4.76 use in a camera of the rear-loading type, but still includes a centering member on the entrance side.
The contact ring remains accessible for a spring contact, present in the coil former, for the output of the video signal. The centering ring is preferably provided on its inner side with ridge-like, axially extending raised portions which are regularly distributed along its circumference and which are partly cut away upon insertion, so that the ring occupies an exactly defined position about the window.
If desired, the ring can be provided on its outer side with structural parts adapted to the centering means of the relevant coil former, but for the most ` commonly used cameras a simple ring already offers 1 15 an adequate centering facility. The ring can be con-j structed to be exchangeable, but in order to avoid asymmetrical mounting, the use of a new ring after each removal is to be preferred.
Fig. 3 shows a pick-up tube which is suitable for a camera of the front-loading type and whicll has been obtained, using the same tube construction, by the provision of a ring 41 by means of a snap-lock 42. The ring 41 is preferably made of metal or an other electrically conductive material, so that the contact with the signal electrode can be esta~lished via this ring. The outer diameter of the ring, and possibly also its shape, has been adapted to tlle centering mealls of the relevant coil former.
_ 7 _
PI-~.8033 2G.4.76 ;
The invention has for its object to ! provide a method which enables the use of a single type of pick-up tube for both types of camera.
; To this end, a method of mounting pick-up tubes in a television camera in accordance with the invention is characterized in that, after having been arranged in the coil former, the pick-up tube is provided with centering means adapted to the adjusting means of the coil former.
Because the method in accordance with the invention enables a pick-up tube to be used in a camera of the front-loading type as well as in a camera of the rear-loading type, a distinction need no longer be made during the production of pick-up tubes, that is to say~a single type suffices in this respect.
In a preferred embodiment in accordance with the invention, the centering means to be separately fitted consists of a centering ring which can be slid about the entrance window with a suitable fit.
In a further preferred embodiment, the centering means to be separately fitted consists of a clamping ring which is clamped about the end of the cylindrical portion of the tube and hence about the signal electrode contact.
Some preferred embodiments of a television camera in accordance with the inventior. and the method ~HN.8033 26.4.76 of assembling the same will be described in detail hereinafter with ref`erence to the drawing.
Fig. 1 is a simplified diagrammatic view of the relevarlt portion of a television camera ' 5 with a pick-up tube.
: Figs. 2 and 3 show different embodiments of television camera tubes with mounting means in accordance with the invention.
Fig. 1 shows a portion relevant for the application of the invention of a television camera comprising a coil unit which includes, for example, a line deflection coil 2 and a frame deflection coil 3 ~ which are both disposed on a coil former 4. In the coil ¦ former there are provided adjusting means 5 and 6 ! 15 for securing a pick-up tube 7 in the coil former.-Thc pick-up tube, that is to say the optical axis of the pick-up tube, can be orientated, axially di~splaced and possibly rotated by means of these adjusting means. Depending on the type of camera, either the adjusting means 5, situated on the entrance side of the pick-up tube, or the adjusting means 6, situated on the tube base side of the pick-up tube,are usually shaped as a flexible ring, the said ring lightly cl~mping a cylindrical portion 8 of an envelope 9 of the pick-up tube. The adjusting means situated at the axially opposite end of the pick-up tube then comprise the necessary auxiliaries for readjustment p~.8033 2G.4.76 of the tube. These readjuL;ting means are included in many known cameras and are not shown in the drawing.
The envelope 9 furthermore comprises a tube base 25 which comprises passage pins 12, a p~mping stem 13 and an entrance window 14. The entrance window 14 may be composed of an optica] fibre plate as well as of a homogeneous glass plate. When a homogeneous glass plate is used for the entrance window, usually a front attachment is added which preferably has a thickness such that the disturbing effects of internal reflections and dust present on the inner side of the lens on the imaging are minimized. The d~meter of an entrance window thus formed is usually smaller than the diameter of the cylindrical portion 8 of the envelope. As is shown in Figs. 2 and 3, on the entrance side of the pick-up tubo there is provided a signal electrode contact 31, for example, in the form of one or a few passages which are electrically conductively connected to a contact ring 32 disposed about the entrance portion of the cylindrical housing. The pick-up tube accommodates a target plate which comprises, for example, a layer 18 of lead monoxide as the photosensitive material and a signal electrode 19 which is preferably arranged on tho entrance window. The pick-up tuhe furthermore ComprisQS a gauze electrode 21, an output electrode 22 . .
p~.8033 2G.4.7~
and an electron source 23 having a cathode 24.
The required voltages can be applied via a base 25 which may comprise a bush 26 for accommodating an auxiliary illumination source which is not shown.
Fig. 2 is a simplified diagrammatic representation of a front portion of a pick-up tube with the cylindrical tube wall portion 8 and the entrance window 1~ which both form part of the envelope of the pick-up tube. The tube accommodates the 10 signal electrode 19 and the photoconductive layer 18 of the target. The signal e]ectrode 19 is connected, via an electrically conductive glass passage 31, to the contact ring 32 fitted about the end of the cylindrical portion of the envelope. This contact 15 ring is integral with the pick-up tube and is provided, for example, by vapour-deposition, baking or an other method suitable for the deposition of a conductive ma-terial on glass. This contact ring is constructed to be so thin, also for known pick-up tubes, that the 20 tube is suitable for a camera of the rear-loading type.
However, the pick-up tube lacks the required centering means for use in a camera of the front-loading t~rpe. These means are constructed in this embodiment as a ring 33 which is preferably made 25 f synthetic material and which can be slid about the front attachment of the entrance window in a clamping fashion. The tube then remains suitable for p~.8033 26.4.76 use in a camera of the rear-loading type, but still includes a centering member on the entrance side.
The contact ring remains accessible for a spring contact, present in the coil former, for the output of the video signal. The centering ring is preferably provided on its inner side with ridge-like, axially extending raised portions which are regularly distributed along its circumference and which are partly cut away upon insertion, so that the ring occupies an exactly defined position about the window.
If desired, the ring can be provided on its outer side with structural parts adapted to the centering means of the relevant coil former, but for the most ` commonly used cameras a simple ring already offers 1 15 an adequate centering facility. The ring can be con-j structed to be exchangeable, but in order to avoid asymmetrical mounting, the use of a new ring after each removal is to be preferred.
Fig. 3 shows a pick-up tube which is suitable for a camera of the front-loading type and whicll has been obtained, using the same tube construction, by the provision of a ring 41 by means of a snap-lock 42. The ring 41 is preferably made of metal or an other electrically conductive material, so that the contact with the signal electrode can be esta~lished via this ring. The outer diameter of the ring, and possibly also its shape, has been adapted to tlle centering mealls of the relevant coil former.
_ 7 _
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A television camera, comprising a camera tube, a coil former surrounding said camera tube and adjusting means located in said coil former for securing the camera tube within the coil former, characterized in that the camera tube is provided with an adaptor for insertion of the tube into opposite ends of the coil former and centering means which are adapted to the adjust-ing means of the coil former and are positioned about an end of the tube whereby the camera tube is insertable into either end of said coil former.
2. A television camera as claimed in Claim 1 wherein the centering means for the camera tube is a ring of synthetic material which is positioned about an entrance window of the camera tube with a suitable fit.
3. A television camera as claimed in Claim 1 wherein the centring means for the camera tube comprises an electrically con-ductive ring positioned about a portion of the camera tube which adjoins the entrance window and which supports a signal electrode contact.
4. A television camera as claimed in Claim 2 wherein the ring of synthetic material has a plurality of ridgelike, axially extending raised portions regularly distributed along its inner circumference.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7506138A NL7506138A (en) | 1975-05-26 | 1975-05-26 | TELEVISION CAMERA. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1055594A true CA1055594A (en) | 1979-05-29 |
Family
ID=19823807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA252,952A Expired CA1055594A (en) | 1975-05-26 | 1976-05-20 | Television camera |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4135210A (en) |
| CA (1) | CA1055594A (en) |
| DE (1) | DE7614996U1 (en) |
| ES (1) | ES221167Y (en) |
| FR (1) | FR2312927A7 (en) |
| GB (1) | GB1531153A (en) |
| NL (1) | NL7506138A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8006166A (en) * | 1980-11-12 | 1982-06-01 | Philips Nv | RECORDING UNIT CONTAINING A RECORDING TUBE. |
| EP0458179B1 (en) * | 1990-05-23 | 1996-09-18 | Hitachi, Ltd. | Image pickup tube and its operating method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2877368A (en) * | 1954-03-11 | 1959-03-10 | Sheldon Edward Emanuel | Device for conducting images |
| GB833300A (en) * | 1957-12-24 | 1960-04-21 | Pye Ltd | Improvements in or relating to television cameras |
| US3628076A (en) * | 1968-12-24 | 1971-12-14 | Philips Corp | Photoconductive screen deriving light thorugh light conductor from tube filament |
| US3712604A (en) * | 1971-04-26 | 1973-01-23 | Motorola Inc | Mechanical spring constant load device |
-
1975
- 1975-05-26 NL NL7506138A patent/NL7506138A/en not_active Application Discontinuation
-
1976
- 1976-05-12 DE DE19767614996U patent/DE7614996U1/en not_active Expired
- 1976-05-13 US US05/686,092 patent/US4135210A/en not_active Expired - Lifetime
- 1976-05-20 CA CA252,952A patent/CA1055594A/en not_active Expired
- 1976-05-21 GB GB21067/76A patent/GB1531153A/en not_active Expired
- 1976-05-24 ES ES1976221167U patent/ES221167Y/en not_active Expired
- 1976-05-24 FR FR7615639A patent/FR2312927A7/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1531153A (en) | 1978-11-01 |
| ES221167U (en) | 1977-04-01 |
| FR2312927A7 (en) | 1976-12-24 |
| US4135210A (en) | 1979-01-16 |
| ES221167Y (en) | 1977-08-01 |
| NL7506138A (en) | 1976-11-30 |
| DE7614996U1 (en) | 1977-10-27 |
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