Patent US3740458A successfully refreshed from Google Patents.
US3740458A
Expired / Lapsed
US
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Image pickup tube
Assignee: Sony Corp
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Filing: 1971-08-31
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Granted: 1973-06-19
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Expires: 1991-08-31
Abstract
Abstract An image pickup tube for a color television camera has a photoconductive layer for the conversion of images projected thereon into an electrical output and onto which a color separated image of an object to be reproduced is projected through a color filter which is part of the tube or separate therefrom, indexing electrodes disposed in close proximity to the photoconductive layer to electrically produce an index image on such layer in response to the application of different voltages to the indexing electrodes so that the electrical output is a composite signal containing a color video signal corresponding to the color separated image and an index signal corresponding to the index image and by which individual color component signals may be separated from the color video signal, and photoelectric transducing means, such as, photoconductive cells, photodiodes, photoswitches, phototransistors or photovoltaic cells, included in the image pickup tube and forming parts of circuits by which voltage differences are applied to the indexing electrodes for establishing the index image.
Inventors
- 👤 Y Kubota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:43
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/45; H01J29/451; H01J29/453; H01J31/00; H01J31/08; H01J31/26; H01J31/46; H04; H04N; H04N9/00; H04N9/01
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
170 words
A color television camera comprising a surface scanned by an electron beam for converting light projected on said surface into an electrical output, filter means disposed between an object in the field of view of the camera and said surface for forming on said surface a color separated image of said object made up of image elements corresponding to the color components of respective elements of said object, a pair of index electrodes for each of said image elements and which are disposed in close proximity to said surface, and circuit means including photoelectric transducing means for applying different electrical potentials to said index electrodes of each said pair thereof for electrically forming an index image on said surface and reversing said different electrical potentials in successive periods of said electrical output so that said electrical output is a composite signal containing a color video signal corresponding to said color separaTed image and an index signal corresponding to said index image and having its phase reversed in said successive periods.
Claim 2
Dependent Claim
170 words
A color television camera comprising a surface scanned by an electron beam for converting light projected on said surface into an electrical output, filter means disposed between an object in the field of view of the camera and said surface for forming on said surface a color separated image of said object made up of image elements corresponding to the color components of respective elements of said object, a pair of index electrodes for each of said image elements and which are disposed in close proximity to said surface, and circuit means including photoelectric transducing means for applying different electrical potentials to said index electrodes of each said pair thereof for electrically forming an index image on said surface and reversing said different electrical potentials in successive periods of said electrical output so that said electrical output is a composite signal containing a color video signal corresponding to said color separaTed image and an index signal corresponding to said index image and having its phase reversed in said successive periods.
Claim 3
Dependent Claim
34 words
An image pickup tube according to claim 1, in which said surface, indexing electrodes and photoelectric transducing means are joined together in a unitary structure constituting a faceplate assembly of the image pickup tube.
Claim 4
Dependent Claim
91 words
An image pickup tube according to claim 2, further comprising a tube envelope having said faceplate assembly disposed at one end, a conductive ring extending around said end of the tube envelope and around the periphery of said faceplate assembly, an electrically conductive sealing member interposed between said ring and said faceplate assembly and tube envelope for hermetically sealing said end of the tube, and conductive means on said faceplate assembly between said sealing member and said index electrodes for applying a bias voltage to the latter from said conductive ring.
Claim 5
Dependent Claim
39 words
An image pickup tube according to claim 3, in which said indexing electrodes are in contact with said surface which has a high resistance so that said electrical output is obtained at said conductive ring from said indexing electrodes.
Claim 6
Dependent Claim
61 words
An image pickup tube according to claim 3, further comprising signal electrode means in contact with said surface and electrically connected with said conductive ring for receiving a bias voltage from the latter, and a tansparent insulating layer between said indexing electrodes and said signal electrode so that said electrical output is obtained at said conductive ring from said signal electrode.
Claim 7
Dependent Claim
20 words
An image pickup tube according to claim 5, in which said signal electrode is in the form of a mesh.
Claim 8
Dependent Claim
43 words
An image pickup tube according to claim 1, in which said circuit means for applying different voltages to the indexing electrodes includes light source means at the exterior of said image pickup tube for emitting light rays to activate said photoelectric transducing means.
Claim 9
Dependent Claim
128 words
An image pickup tube according to claim 7, wherein said indexing electrodes each include a plurality of elongated parallel elements extending at right angles to the direction of scanning of said surface by said beam with said elements of one of said indexing electrodes being interleaved with said elements of the other of said indexing electrodes so that said index signal is represented by an alternating voltage in said output, and said circuit means further includes an alternating signal source synchronized with the scanning of said beam and connected with said light source means to cause said photoelectric transducing means to alternate said different voltages applied to said indexing electrodes in successive scanning periods and thereby reverse the phase of said index signal in said successive scanning periods.
Claim 10
Dependent Claim
27 words
An image pickup tube according to claim 7, in which said light source means includes at least one luminescent diode which, when energized, emits said light rays.
Claim 11
Dependent Claim
54 words
An image pickup tube according to claim 7, in which said photoelectric transducing means includes at least one photovoltaic cell which, when energized by light rays from said light source means, increases the voltage applied to one of said indexing electrodes with respect to the voltage applied to the other of said indexing electrodes.
Claim 12
Dependent Claim
76 words
An image pickup tube according to claim 7, in which said photoelectric transducing means includes at least first and second photovoltaic cells connected with said indexing electrodes to alternately increase the voltages applied to said indexing electrodes in response to the activation of said first and second cells, and said light source means includes first and second light sources which are alternately energized to emit light rays for alternately activating said first and second photovoltaic cells.
Claim 13
Dependent Claim
77 words
An image pickup tube according to claim 11, in which said photoelectric transducing means includes third and fourth photovoltaic cells activated by light rays from said first and second light sources, respectIvely, and connected with said indexing electrodes for decreasing the voltages applied to each of said indexing electrodes simultaneously with the increasing of the voltage applied to the other of said indexing voltages by activation of a selected one of said first and second photovoltaic cells.
Claim 14
Dependent Claim
85 words
An image pickup tube according to claim 7, in which said circuit means further includes means for applying a bias voltage to said indexing electrodes, asid photoelectric transducing means includes first and second phototransistors connected with said indexing electrodes to alternately decrease said bias voltage applied thereto in response to the activation of said first and second phototransistors, and said light source means includes first and second light sources which are alternately energized to emit light rays for alternately activating said first and second phototransistors.
Claim 15
Dependent Claim
41 words
An image pickup tube according to claim 13, in which said means for applying a bias voltage includes at least one photovoltaic cell included in said faceplate assembly, said photovoltaic cell being continuously energized by light from an external light source.
Claim 16
Dependent Claim
87 words
An image pickup tube according to claim 7, in which said circuit means further includes means for applying a bias voltage to said indexing electrodes, sid photoelectric transducing means includes first and second photoconductive cells through which said bias voltage is applied to the respective indexing electrodes in response to selective activation of said first and second photoconductive cells, and said light source means includes first and second light sources which are alternately energized to emit light rays for alternately activating said first and second photoconductive cells.
Claim 17
Dependent Claim
40 words
An image pickup tube according to claim 15, in which said means for applying a bias voltage includes at least one photovoltaic cell included in said faceplate assembly said photovoltaic cell being continuously energized by light from an external source.
Claim 18
Dependent Claim
96 words
An image pickup tube according to claim 7, in which said circuit means includes capacitor means connected with said indexing electrodes and said photoelectric transducing means, and is operative to charge said capacitor means and raise the potential of one of said indexing electrodes relative to the other indexing electrode upon activation of said photoelectric transducing means, with the charge on said capacitor means being effective to raise the potential on said other electrode relative to said one electrode upon deactivation of said photoelectric transducing means, and in which said light source means is intermittently energized.
Claim 19
Dependent Claim
18 words
An image pickup tube according to claim 17, in whcih said photoelectric transducing means is a single photodiode.
Claim 20
Dependent Claim
23 words
An image pickup tube according to claim 1, in which said photoelectric transducing means are responsive to light rays which surface is insensitive.
References Cited (Backward Citations)
US2843659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |