US3126498A - Thermoelectric cooling of vidicons - Google Patents

Thermoelectric cooling of vidicons Download PDF

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US3126498A
US3126498A US3126498DA US3126498A US 3126498 A US3126498 A US 3126498A US 3126498D A US3126498D A US 3126498DA US 3126498 A US3126498 A US 3126498A
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cooling
vidicon
tube
cooling unit
coil
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    • 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
    • H04N23/51—Housings
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects

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  • the invention relates to improved television cameras lthat include a picture pickup tube of the type having a photoconductive target or screen, a vidicon being an example of a tube of this type.
  • the invention relates particularly to thermoeleotnic cooling of pickup tubes of this 'type and to means for preventing the cooling current from skewing or otherwise adversely aecting the transmitted picture.
  • the invention will be described, by Way of example, as it may be applied to the television color camera described in application S.N. 119,871, tiled lune 27, 1961, in the name of A. V. Bedford and entitled Color Television Camera System.
  • This television camera comprises three color pickup tubes of the vidicon tube and' one high resolution pickup tube such -as an image orthicon which functions as a luminance pickup tube. It is desirable to cool the vidicon target both to improve the vidicon sensitivity and to prevent wide variations in the temperature of the vidicon target. The latter is of interest because the vidicon dark current increases with an increase in target temperature.
  • the cooling is done by use of a thermoelectric cooling unit, and the axial component of the magnetic field produced by the cooling unit current is balanced out by providing a bucking or cancelling axial ield.
  • Much of the magnetic iield produced by the flow of current through the cooling unit is transverse to the longitudinal axis of the vidicon and can be prevented from Vreaching the vidicon by means of shielding. It is found, however, that there is a magnetic field component that is coaxial with the vidicon which is of suiiicient strength to atleet the vidicon detiection and skew the transmitted picture unless it is prevented from reaching the vidicon.
  • FIGURE 1 is a plan view, partly in section, illustrating one embodiment of the invention
  • FlGURE 2 is a view in cross section taken on the line 2-2 of FIGURE 1,
  • FIGURE 3 is a plan view of a thermoelectric cooling unit that is included in the apparatus of -FIGURE l, and
  • FIGURE 4 is view in cross section taken on the line 4-4 of IFIGURE 3, together with a -showing of a iield balancing coil and circuit connections as employed in the apparatus of FIGURE 1.
  • a metal plate 12 is attached to the side of the box 11. 'Ihe base plate serves to support the various elements, and also serves as a heat sink.
  • the face plate end of the vidicon is supported in lirm abutting relation to Ia block of copper 13 which is cooled by a thermoelectric cooling unit 14.
  • the cooling unit 14 is in close contact with the base plate 12.
  • the copper block 13 may be supported from the base plate 12 with the cooling unit 14 clamped between the block 13 ⁇ and the ⁇ base plate 12.
  • the cross section view of the cooling unit 14 in FIG. 1 is taken on the line 1-1 of FIG. 4.
  • a ring-like member 16 of nylon is supported on the small end of the copper block 13. A portion of member 16 extend-ing beyond the block 13 is shaped to receive the end of the vidicon in a snug fit thereby supporting the end of the vidicon.
  • the other end of the vidicon is supported by a tube socket 17 which in turn is supported by an insulating support 18 secured to the base plate 12.
  • the vidicon is surrounded by a cylindrical shield 19 of ferrite. This shield is supported by metal supports 21 and 22 which Iare secured to the base plate 12.
  • a camera lens 23 is positioned in front of the vidicon for imaging the scene lto be transmitted on the vidicon target.
  • the lens is supported by an insulating support 24 which is secured to the base plate 12.
  • the camera lenses for the other two vidicons are indicated at 2.3 in FIG. 2.
  • the supports for these lenses are indicated at 24.
  • the mirror 26 for reflecting one of the primary colors of the scene to the camera lens is supported by the base plate 12, and is adjusted to be at an angle of 45 degrees to the vertical.
  • a heat exchanger 27 containing cooling tins 30 is secured in close contact with the base plate 12 to remove heat from the hot side of the cooling unit 14.
  • a blower 2.8 forces air through the heat exchanger.
  • the heavy flow of direct current through cooling unit 14 produces a magnetic tield that should not reach the vidicon.
  • the component of this ield transverse to the longitudinal axis of the vidicon does not disturb the vidicon because it is shielded by the ferrite shield 19.
  • the axial component of this iield can-not be prevented from reaching the vidicon by the use of shielding, however, s-ince there must be a clear optical path for the scene to be imaged on the orthicon target.
  • the problem is solved by providing a balancing iield that bucks out the axial field.
  • This balancing field is provided, in the specific example illustrated, by a balancing coil 31 comprising two turns of wire, that are connected in series with the cooling unit so that the cooling current flows through the coil.
  • the balancing coil 31 is of sutiicient diameter and is so positioned that it does not interfere with the optical path of the scene being televised.
  • the two turns are wound around the lens mounting structure. They are wound in the direction to provide a magnetic field that opposes the undesired axial magnetic iield of the cooling unit.
  • the cooling unit and cancellation of its yaxial iield will be discussed further, but at this point attention is directed to the optics chamber located Ibetween the camera lens and the vidicon. It will be noted that it is conical in shape, being formed by a conical opening in the copper cooling block 13.
  • the chamber is both light proof and dust proof, this being insured by the use of suit-able thermal insulation 32 such as urethane which seals the joints.
  • the cooling unit illustrated is of a well known type comprising P type and N type materials (FIG. 4) which are connected in series relation by means of copper plates 33a, 33h, etc. on the hot side of the unit and by means of copper plates 33A, etc. on the cold side of the unit. Only the first copper plate 33A and the last copper plate 33H on the cold side are shown.
  • the cooling current about 2O amperes in this example, flows from plate 33a, down a P type element to plate 33A through plate 33A and up an N type element to plate 33h, through plate 33h and down a P type element to plate 33B (not shown), etc., until the final copper plate 331' is reached.
  • the direction of the current flow will be understood from the foregoing description and from an inspection of FIG. 3 where the arrows on the copper plates indicate the direction of current ow.
  • One result of this current flow is the production of a magnetic eld having a component that is eoaxial with the vidicon as previously stated.
  • the coil 31 for bucking out this axial field is shown in FIG. 4 connected in series with the cooling unit.
  • a picture pickup tube of the type having a photoconductive target close to the end or face plate of the tube; means for cooling said target, said means comprising a metal cooling block in Contact with said face plate, said cooling block having an opening therethrough which is coaxial with said tube for providing an optical path through which an image may be formed on said target, a thermoelectric cooling unit in contact with said cooling block; a magnetic eld balancing coil positioned opposite the face plate of said tube and positioned coaxially with said tube, and means connecting said coil and said cooling unit in series, said coil being wound in the direction to provide a eld that opposes the axial component of the magnetic eld caused by the current ow through the cooling unit, said coil also having a number of turns such that its ield balances out said axial component.
  • a picture pickup tube of the type having a photoconductive target close to the end or face plate of the tube; means for cooling said target, said means comprising a metal cooling block in contact with said face plate, said cooling block having an opening therethrough which is coaxial with said tube for providing an optical path through which an image may be formed on said target, a thermoelectric cooling unit in contact with said cooling block; a magnetic iield balancing coil positioned opposite the face plate of said tube and positioned coaxially with said tube, means connecting said coil and said cooling unit in series whereby the cooling current flows through both said coil and said cooling unit, said coil being wound in the direction to provide a eld that opposes the axial component of the magnetic field caused by the current iiow through the cooling unit, said coil also having a number of turns such that its field balances out said axial component, and electromagnetic shielding means surrounding said tube for shielding it from the transverse component of said magnetic eld.
  • a vidicon having a face plate at one end and a photoconductive target close to said face plate, a cooling bloclt of good thermal conductivity positioned with one end in contact with said face plate, said cooling block having an opening therethrough that is coaxial with said vidicon for providing an unobstructed optical path, a camera lens positioned at the other end of said cooling block with the optical axis of the lens coaxial with the vidicon, a thermoelectric cooling unit positioned against said cooling block for cooling it when cooling current tiows through said cooling unit, said cooling current producing an undesired axial magnetic iield component, and means for producing a balnacing magnetic field to balance out said axial component.
  • a vidicon having a face plate at one end and a photoconductive target close to said face plate, a cooling block of good thermal conductivity positioned With one end in contact with said face plate, said cooling block having an opening therethrough that is coaxial with said vidicon for providing an unobstructed optical path, a camera lens which has the lens elements in a lens mounting structure that is positioned at the other end of said cooling block with the optical axis of the lens coaxial with the vidicon, a thermoelectric cooling unit positioned against said cooling block for cooling it when cooling current ows through said cooling unit, said cooling current producing an undesired axial magnetic eld component, and means for producing a balancing magnetic field to balance out said axial component, said last means cornprising a coil wound around the lens mounting structure.
  • a vidicon having a face plate at one end and a photoconductive target close to said face plate, a cooling block of good thermal conductivity positioned with one end in contact with said face plate, said cooling block having an opening therethrough that is coaxial with said vidicon for providing an unobstructed optical path, a camera lens which has the lens elements in a lens mounting structure that is positioned at the other end of said cooling block with the optical axis of the lens coaxial with the vidicon, a thermoelectric cooling unit positioned against said cooling block for cooling it when cooling current flows through said cooling unit, said cooling current producing an undesired axial magnetic field component, and means for producing a balancing magnetic field to balance out said axial component, said last means comprising a coil wound around the lens mounting structure and connected in series with said cooling unit.

Description

Mal'Ch 24 1964 s. l.. BENDELL THERMOELECTRIC COOLING oF vIDIcoNs Filed March 27, 1962 United States Patent O 3,125,498 THERMGELECTRIC COOLING F VIDECNS Sidney L. Rendell, Haddon Heights, NJ., assigner to Radio Corporation of America, a corporation oi' Delaware Filed Mar. 27, 1962,` Ser. No. 1S2,860 Claims. (Cl. 315-8) The invention relates to improved television cameras lthat include a picture pickup tube of the type having a photoconductive target or screen, a vidicon being an example of a tube of this type. The invention relates particularly to thermoeleotnic cooling of pickup tubes of this 'type and to means for preventing the cooling current from skewing or otherwise adversely aecting the transmitted picture.
The invention will be described, by Way of example, as it may be applied to the television color camera described in application S.N. 119,871, tiled lune 27, 1961, in the name of A. V. Bedford and entitled Color Television Camera System. This television camera comprises three color pickup tubes of the vidicon tube and' one high resolution pickup tube such -as an image orthicon which functions as a luminance pickup tube. It is desirable to cool the vidicon target both to improve the vidicon sensitivity and to prevent wide variations in the temperature of the vidicon target. The latter is of interest because the vidicon dark current increases with an increase in target temperature.
In practicing the present invention the cooling is done by use of a thermoelectric cooling unit, and the axial component of the magnetic field produced by the cooling unit current is balanced out by providing a bucking or cancelling axial ield. Much of the magnetic iield produced by the flow of current through the cooling unit is transverse to the longitudinal axis of the vidicon and can be prevented from Vreaching the vidicon by means of shielding. It is found, however, that there is a magnetic field component that is coaxial with the vidicon which is of suiiicient strength to atleet the vidicon detiection and skew the transmitted picture unless it is prevented from reaching the vidicon.
The invention will be described in detail with reference to the accompanying drawing, in which:
FIGURE 1 is a plan view, partly in section, illustrating one embodiment of the invention,
FlGURE 2 is a view in cross section taken on the line 2-2 of FIGURE 1,
FIGURE 3 is a plan view of a thermoelectric cooling unit that is included in the apparatus of -FIGURE l, and
'FIGURE 4 is view in cross section taken on the line 4-4 of IFIGURE 3, together with a -showing of a iield balancing coil and circuit connections as employed in the apparatus of FIGURE 1.
In the several figures similar parts are indicated by like reference characters.
Referring to FIGS. l and 2, the three vidicons of the color camera are supported in =a comparatively deep rectangular box 11 that is of mu metal for shielding purposes. Only one vidicon with its cooling means, axial iield cancellation means, and optical system is shown, the other two vidicons being positioned beneath the one shown in FIG. 1 and being cooled and protected from magnetic iields in the same way. The following description applies to all three vidicons.
A metal plate 12 is attached to the side of the box 11. 'Ihe base plate serves to support the various elements, and also serves as a heat sink.
The face plate end of the vidicon is supported in lirm abutting relation to Ia block of copper 13 which is cooled by a thermoelectric cooling unit 14. Thus the face plate and the photoconductive target located close thereto are ICC cooled. The cooling unit 14 is in close contact with the base plate 12. The copper block 13 may be supported from the base plate 12 with the cooling unit 14 clamped between the block 13 `and the `base plate 12. The cross section view of the cooling unit 14 in FIG. 1 is taken on the line 1-1 of FIG. 4.
In order to hold the face plate end of the vidicon in position, a ring-like member 16 of nylon is supported on the small end of the copper block 13. A portion of member 16 extend-ing beyond the block 13 is shaped to receive the end of the vidicon in a snug fit thereby supporting the end of the vidicon. The other end of the vidicon is supported by a tube socket 17 which in turn is supported by an insulating support 18 secured to the base plate 12.
The vidicon is surrounded by a cylindrical shield 19 of ferrite. This shield is supported by metal supports 21 and 22 which Iare secured to the base plate 12.
A camera lens 23 is positioned in front of the vidicon for imaging the scene lto be transmitted on the vidicon target. The lens is supported by an insulating support 24 which is secured to the base plate 12. The camera lenses for the other two vidicons are indicated at 2.3 in FIG. 2. The supports for these lenses are indicated at 24.
The mirror 26 for reflecting one of the primary colors of the scene to the camera lens is supported by the base plate 12, and is adjusted to be at an angle of 45 degrees to the vertical.
A heat exchanger 27 containing cooling tins 30 is secured in close contact with the base plate 12 to remove heat from the hot side of the cooling unit 14. A blower 2.8 forces air through the heat exchanger.
The heavy flow of direct current through cooling unit 14 produces a magnetic tield that should not reach the vidicon. The component of this ield transverse to the longitudinal axis of the vidicon does not disturb the vidicon because it is shielded by the ferrite shield 19. The axial component of this iield can-not be prevented from reaching the vidicon by the use of shielding, however, s-ince there must be a clear optical path for the scene to be imaged on the orthicon target. The problem is solved by providing a balancing iield that bucks out the axial field. This balancing field is provided, in the specific example illustrated, by a balancing coil 31 comprising two turns of wire, that are connected in series with the cooling unit so that the cooling current flows through the coil. The balancing coil 31 is of sutiicient diameter and is so positioned that it does not interfere with the optical path of the scene being televised. In the example illustrated, the two turns are wound around the lens mounting structure. They are wound in the direction to provide a magnetic field that opposes the undesired axial magnetic iield of the cooling unit.
The cooling unit and cancellation of its yaxial iield will be discussed further, but at this point attention is directed to the optics chamber located Ibetween the camera lens and the vidicon. It will be noted that it is conical in shape, being formed by a conical opening in the copper cooling block 13. The chamber is both light proof and dust proof, this being insured by the use of suit-able thermal insulation 32 such as urethane which seals the joints.
Refer now to the thremoelectric cooling unit shown in plan view in FIG. 3 and in section in FIG. 4, the section being taken on the line 4 4 of FIG. 3 looking in the direction of the arrows. In the sectional view of FIG. 4 the foamed-in-place insulation of the cooling unit is omitted for the purpose of showing the structure. The cooling unit illustrated is of a well known type comprising P type and N type materials (FIG. 4) which are connected in series relation by means of copper plates 33a, 33h, etc. on the hot side of the unit and by means of copper plates 33A, etc. on the cold side of the unit. Only the first copper plate 33A and the last copper plate 33H on the cold side are shown.
In the example illustrated, the cooling current, about 2O amperes in this example, flows from plate 33a, down a P type element to plate 33A through plate 33A and up an N type element to plate 33h, through plate 33h and down a P type element to plate 33B (not shown), etc., until the final copper plate 331' is reached. The direction of the current flow will be understood from the foregoing description and from an inspection of FIG. 3 where the arrows on the copper plates indicate the direction of current ow. One result of this current flow is the production of a magnetic eld having a component that is eoaxial with the vidicon as previously stated. The coil 31 for bucking out this axial field is shown in FIG. 4 connected in series with the cooling unit. If the cooling current is increased either manually or automatically (as by means of a. thermostatic control), this causes the eld bucking current owing through coil 31 to be increased by the same amount. Thus, there results a stronger bucking eld which balances out the increased axial eld component due to the increased cooling current.
What is claimed is:
1. A picture pickup tube of the type having a photoconductive target close to the end or face plate of the tube; means for cooling said target, said means comprising a metal cooling block in Contact with said face plate, said cooling block having an opening therethrough which is coaxial with said tube for providing an optical path through which an image may be formed on said target, a thermoelectric cooling unit in contact with said cooling block; a magnetic eld balancing coil positioned opposite the face plate of said tube and positioned coaxially with said tube, and means connecting said coil and said cooling unit in series, said coil being wound in the direction to provide a eld that opposes the axial component of the magnetic eld caused by the current ow through the cooling unit, said coil also having a number of turns such that its ield balances out said axial component.
2. A picture pickup tube of the type having a photoconductive target close to the end or face plate of the tube; means for cooling said target, said means comprising a metal cooling block in contact with said face plate, said cooling block having an opening therethrough which is coaxial with said tube for providing an optical path through which an image may be formed on said target, a thermoelectric cooling unit in contact with said cooling block; a magnetic iield balancing coil positioned opposite the face plate of said tube and positioned coaxially with said tube, means connecting said coil and said cooling unit in series whereby the cooling current flows through both said coil and said cooling unit, said coil being wound in the direction to provide a eld that opposes the axial component of the magnetic field caused by the current iiow through the cooling unit, said coil also having a number of turns such that its field balances out said axial component, and electromagnetic shielding means surrounding said tube for shielding it from the transverse component of said magnetic eld.
3. In combination, a vidicon having a face plate at one end and a photoconductive target close to said face plate, a cooling bloclt of good thermal conductivity positioned with one end in contact with said face plate, said cooling block having an opening therethrough that is coaxial with said vidicon for providing an unobstructed optical path, a camera lens positioned at the other end of said cooling block with the optical axis of the lens coaxial with the vidicon, a thermoelectric cooling unit positioned against said cooling block for cooling it when cooling current tiows through said cooling unit, said cooling current producing an undesired axial magnetic iield component, and means for producing a balnacing magnetic field to balance out said axial component.
4. In combination, a vidicon having a face plate at one end and a photoconductive target close to said face plate, a cooling block of good thermal conductivity positioned With one end in contact with said face plate, said cooling block having an opening therethrough that is coaxial with said vidicon for providing an unobstructed optical path, a camera lens which has the lens elements in a lens mounting structure that is positioned at the other end of said cooling block with the optical axis of the lens coaxial with the vidicon, a thermoelectric cooling unit positioned against said cooling block for cooling it when cooling current ows through said cooling unit, said cooling current producing an undesired axial magnetic eld component, and means for producing a balancing magnetic field to balance out said axial component, said last means cornprising a coil wound around the lens mounting structure.
5. In combination, a vidicon having a face plate at one end and a photoconductive target close to said face plate, a cooling block of good thermal conductivity positioned with one end in contact with said face plate, said cooling block having an opening therethrough that is coaxial with said vidicon for providing an unobstructed optical path, a camera lens which has the lens elements in a lens mounting structure that is positioned at the other end of said cooling block with the optical axis of the lens coaxial with the vidicon, a thermoelectric cooling unit positioned against said cooling block for cooling it when cooling current flows through said cooling unit, said cooling current producing an undesired axial magnetic field component, and means for producing a balancing magnetic field to balance out said axial component, said last means comprising a coil wound around the lens mounting structure and connected in series with said cooling unit.
References Cited in the tile of this patent UNITED STATES PATENTS 2,517,807 Sziklai Aug. 8, 1950 2,879,424 Garbuny et al. Mar. 24, 1959 2,907,914 Brownell Oct. 6, 1959 2,967,961 Heil Jan. 10, 1961 2,975,283 Morton Mar. 14, 1961 3,064,440 Waller Nov. 20, 1962

Claims (1)

1. A PICTURE PICKUP TUBE OF THE TYPE HAVING A PHOTOCONDUCTIVE TARGET CLOSE TO THE END OR FACE PLATE OF THE TUBE; MEANS FOR COOLING SAID TARGET, SAID MEANS COMPRISING A METAL COOLING BLOCK IN CONTACT WITH SAID FACE PLATE, SAID COOLING BLOCK HAVING AN OPENING THERETHROUGH WHICH IS COAXIAL WITH SAID TUBE FOR PROVIDING AN OPTICAL PATH THROUGH WHICH AN IMAGE MAY BE FORMED ON SAID TARGET, A THERMOELECTRIC COOLING UNIT IN CONTACT WITH SAID COOLING BLOCK; A MAGNETIC FIELD BALANCING COIL POSITIONED OPPOSIT THE FACE PLATE OF SAID TUBE AND POSITIONED COAXIALLY WITH SAID TUBE, AND MEANS CONNECTING SAID COIL AND SAID COOLING UNIT IN SERIES, SAID COIL BEING WOUND IN THE DIRECTION TO PROVIDE A FIELD THAT OPPOSES THE AXIAL COMPONENT OF THE MAGNETIC FIELD CAUSED BY THE CURRENT FLOW THROUGH THE COOLING UNIT, SAID COIL ALSO HAVING A NUMBER OF TURNS SUCH THAT ITS FIELD BALANCES OUT SAID AXIAL COMPONENT.
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3403723A (en) * 1965-08-10 1968-10-01 Lithonia Lighting Inc Dynamically integrated comfort conditioning system
US3464218A (en) * 1967-12-28 1969-09-02 Meade Electric Co Of Indiana I Heat exchange housing for television camera and the like
US3500453A (en) * 1968-02-02 1970-03-10 Us Air Force Fiber glass cooling jacket for directing air across an infrared scanning tube
US3715491A (en) * 1970-03-14 1973-02-06 Marconi Co Ltd Television camera tube cooling arrangements
US3919597A (en) * 1972-05-16 1975-11-11 Westinghouse Electric Corp Subminiature television camera
US4218712A (en) * 1977-03-17 1980-08-19 Bethlehem Steel Corporation Magnetically shielded image dissector tube camera
US4551760A (en) * 1983-09-16 1985-11-05 Rca Corporation Television camera with solid-state imagers cooled by a thermal servo
US5839284A (en) * 1995-10-04 1998-11-24 Raytheon Ti Systems, Inc. Image intensifier tv integral thermal control system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2517807A (en) * 1945-05-30 1950-08-08 Rca Corp Neutralization of deflection field between photocathode and mosaic of pickup tube
US2879424A (en) * 1955-04-04 1959-03-24 Westinghouse Electric Corp Image detector
US2907914A (en) * 1954-05-26 1959-10-06 Magnetic Metals Company Electrically energized magnetic shield
US2967961A (en) * 1958-07-24 1961-01-10 Gen Electric Thermally sensitive pickup tube
US2975283A (en) * 1950-12-05 1961-03-14 Rca Corp Infra-red signalling and detecting systems
US3064440A (en) * 1959-05-18 1962-11-20 Nuclear Corp Of America Thermoelectric system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2517807A (en) * 1945-05-30 1950-08-08 Rca Corp Neutralization of deflection field between photocathode and mosaic of pickup tube
US2975283A (en) * 1950-12-05 1961-03-14 Rca Corp Infra-red signalling and detecting systems
US2907914A (en) * 1954-05-26 1959-10-06 Magnetic Metals Company Electrically energized magnetic shield
US2879424A (en) * 1955-04-04 1959-03-24 Westinghouse Electric Corp Image detector
US2967961A (en) * 1958-07-24 1961-01-10 Gen Electric Thermally sensitive pickup tube
US3064440A (en) * 1959-05-18 1962-11-20 Nuclear Corp Of America Thermoelectric system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3403723A (en) * 1965-08-10 1968-10-01 Lithonia Lighting Inc Dynamically integrated comfort conditioning system
US3464218A (en) * 1967-12-28 1969-09-02 Meade Electric Co Of Indiana I Heat exchange housing for television camera and the like
US3500453A (en) * 1968-02-02 1970-03-10 Us Air Force Fiber glass cooling jacket for directing air across an infrared scanning tube
US3715491A (en) * 1970-03-14 1973-02-06 Marconi Co Ltd Television camera tube cooling arrangements
US3919597A (en) * 1972-05-16 1975-11-11 Westinghouse Electric Corp Subminiature television camera
US4218712A (en) * 1977-03-17 1980-08-19 Bethlehem Steel Corporation Magnetically shielded image dissector tube camera
US4551760A (en) * 1983-09-16 1985-11-05 Rca Corporation Television camera with solid-state imagers cooled by a thermal servo
US5839284A (en) * 1995-10-04 1998-11-24 Raytheon Ti Systems, Inc. Image intensifier tv integral thermal control system

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