US4080624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical color-separation system for use in a color television camera
Assignee: Fujinon Corp
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Filing: 1977-01-19
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Granted: 1978-03-21
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Expires: 1997-01-19
Abstract
Abstract An optical color-separation system for use in a color television camera having an image plane compensating lens associated with each of three camera tubes. Each compensating lens is provided with a diffusing area lying on the periphery thereof so as to be out of the image forming optical path. Photo-diodes are provided in opposing relation to the diffusing area. Light from the photo-diodes passes through the diffusion area to provide bias light for the camera tube.
Inventors
- 👤 Kunio Ando
- 👤 Toshiro Yamauchi
- 👤 Seiji Toyama
- 👤 Haruo Kakizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:07
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/10; H04N23/13; H04N23/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
67 words
In an optical color-separation system for use in a color television camera including an image plane compensating lens for each camera tube, the improvement wherein said image surface compensating lens is provided with a light diffusing area through which illuminating light is projected from a light source onto the photo-electric converting plane of said camera tube, thus providing a beam of bias light to said camera tube.
Claim 2
Dependent Claim
67 words
In an optical color-separation system for use in a color television camera including an image plane compensating lens for each camera tube, the improvement wherein said image surface compensating lens is provided with a light diffusing area through which illuminating light is projected from a light source onto the photo-electric converting plane of said camera tube, thus providing a beam of bias light to said camera tube.
Claim 3
Dependent Claim
32 words
An optical color-separation system for use in a color television camera according to claim 1 wherein said diffusing area is an annular area at the periphery of said image plane compensating lens.
Claim 4
Dependent Claim
32 words
An optical color-separation system for use in a color television camera according to claim 1 wherein said light source is a plurality of photo-diodes provided in opposing relation to said diffusing area.
Claim 5
Dependent Claim
26 words
An optical color-separation system for use in a color television camera according to claim 3 wherein said photo-diodes are photo-diodes which emit yellow or green light.
References Cited (Backward Citations)
US3590145A
Cited
US4031551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |