US4123777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color television camera having an auxiliary illumination source
Assignee: Canon Inc
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Filing: 1977-03-28
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Granted: 1978-10-31
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Expires: 1997-03-28
Abstract
Abstract A color television camera having an auxiliary illumination source. This color television camera has a color separation prism of plural blocks of prisms. The incidence prism of this color separation prism has two recesses, namely, the first and the second. In the first recess, an auxiliary illumination source is positioned. A part of the light coming from this source is directed to the image pickup tube after being transmitted to the surface which forms the first recess. Another part of the light coming from this source is directed to the second recess after being transmitted to the surface which forms the first recess. The light which goes to the second recess is re-directed to the image pickup tube after being reflected from the surface of the second recess.
Inventors
- 👤 Takeshi Sekiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:18
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/10; H04N23/13; H04N23/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
185 words
A color television camera having an auxiliary illumination source, which comprises an objective lens; a color separation prism receiving a light from said objective lens and providing a plurality of component color beams, said color separation prism including a plurality of prism blocks and an incidence prism within the plurality of the prism blocks and being provided with a first and a second recesses; an auxiliary illumination device arranged on the first recess of said color separation prism; and plural image pickup tubes on which said color component images are formed; whereby the light coming from said auxiliary illumination device enters said color separation prism through the surface having the first recess, and a part of the light entering said color separation prism is directed to said second recess and reflected by the surface having the second recess, emitted through the exit surfaces of said color separation prism, and directed to the image pickup tubes, and the other part of light entering said color separation prism is directed to said image pickup tubes after being emitted through the exit surfaces of said color separation prism.
Claim 2
Dependent Claim
185 words
A color television camera having an auxiliary illumination source, which comprises an objective lens; a color separation prism receiving a light from said objective lens and providing a plurality of component color beams, said color separation prism including a plurality of prism blocks and an incidence prism within the plurality of the prism blocks and being provided with a first and a second recesses; an auxiliary illumination device arranged on the first recess of said color separation prism; and plural image pickup tubes on which said color component images are formed; whereby the light coming from said auxiliary illumination device enters said color separation prism through the surface having the first recess, and a part of the light entering said color separation prism is directed to said second recess and reflected by the surface having the second recess, emitted through the exit surfaces of said color separation prism, and directed to the image pickup tubes, and the other part of light entering said color separation prism is directed to said image pickup tubes after being emitted through the exit surfaces of said color separation prism.
Claim 3
Dependent Claim
26 words
A color television camera having an auxiliary illumination source according to claim 1, in which said surface of the second recess is a totally reflecting surface.
Claim 4
Dependent Claim
26 words
A color television camera having an auxiliary illumination source according to claim 1, in which said surface of said second recess is a diffusing mat surface.
Claim 5
Dependent Claim
27 words
A color television camera having an auxiliary illumination source according to claim 1, in which said surface of said second recess is covered with a reflective layer.
Claim 6
Dependent Claim
26 words
A color television camera having an auxiliary illumination source according to claim 1, in which said auxiliary illumination device has a tube and a light source.
Claim 7
Dependent Claim
24 words
A color television camera having an auxiliary illumination source according to claim 5, in which the inside of said tube is a reflecting surface.
References Cited (Backward Citations)
US3739080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |