US3914787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color television camera with a color-resolving optical system
Assignee: Canon Inc
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Filing: 1974-02-08
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Granted: 1975-10-21
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Expires: 1994-02-08
Abstract
Abstract A color television camera with a color-resolving optical system includes an objective lens. A diverging lens is disposed in the back-focus portion of the objective lens to make the axial convergent light from the object lens into a substantially afocal light beam. At least one color-selecting reflective filter is provided in the path of the afocal light. A converging lens is disposed in the path of the light from the color-selecting reflective filter to converge the substantially afocal light from the filter and direct it onto a pickup tube.
Inventors
- 👤 Takeshi Sekiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:39
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/1006; G02B27/1013; H; H04; H04N; H04N23/00; H04N23/10; H04N23/13; H04N23/16; G02B27/14; G02B27/145; G03; G03B; G03B33/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
176 words
A television camera provided with a color-resolving optical system comprising: an objective lens having a relatively short back focus portion; first, second and third pickup tubes; a diverging lens disposed in the back-focus portion of said objective lens; a first color-separating filter disposed in the path of light from said diverging lens to separate the light from said diverging lens into a light beam including one color component light and another light beam including the other two color component lights; a first converging lens disposed in the path of said light beam including said one color component light from said first filter to form a first image on said first pickup tube; a second converging lens disposed in the path of said light beam including said other two color component lights from said second filter; and a second color-separating filter disposed in the back-focus portion of said second converging lens to separate the light beam from said second converging lens into two monochromatic component lights and direct them to said second and third pickup tubes, respectively.
Claim 2
Dependent Claim
176 words
A television camera provided with a color-resolving optical system comprising: an objective lens having a relatively short back focus portion; first, second and third pickup tubes; a diverging lens disposed in the back-focus portion of said objective lens; a first color-separating filter disposed in the path of light from said diverging lens to separate the light from said diverging lens into a light beam including one color component light and another light beam including the other two color component lights; a first converging lens disposed in the path of said light beam including said one color component light from said first filter to form a first image on said first pickup tube; a second converging lens disposed in the path of said light beam including said other two color component lights from said second filter; and a second color-separating filter disposed in the back-focus portion of said second converging lens to separate the light beam from said second converging lens into two monochromatic component lights and direct them to said second and third pickup tubes, respectively.
Claim 3
Dependent Claim
325 words
A television camera provided with a color-resolving optical system, which comprises in combination: a. an objective lens having a relatively short back focus portion; b. first, second, and third pickup tubes, all being disposed in parallel with the optical axis of said objective lens; c. a diverging lens disposed in the back focus portion of said objective lens; d. a first color-separating filter disposed in the path of light from said diverging lens to separate the light from said diverging lens into a light beam including one color component light which is travelling in deviation from said optical axis of said objective lens, and another light beam including the remaining two color component lights which are travelling along the optical axis of said objective lens; e. a first mirror member disposed in the path of said light beam which is travelling in deviation from said optical axis to convert the same into a light beam which is travelling in parallel with said optical axis; f. a first converging lens disposed in the path of said one color component light beam to form an image on said first pickup tube; g. a second converging lens disposed in the path of said light beam including said remaining two color component lights from said first color-separating filter; h. a second color-separating filter disposed in the back focus portion of said second converging lens to separate the light beam from said second converging lens into a light beam including one color component light which is travelling in deviation from said optical axis of said objective lens, and another light beam including another color component light which is travelling along the optical axis of said objective lens; and j. a second mirror member disposed in the path of said light beam from said second color-separating filter, travelling in deviation from said optical axis, to convert the same into a light beam which is travelling in parallel with said optical axis.
Claim 4
Dependent Claim
325 words
A television camera provided with a color-resolving optical system, which comprises in combination: a. an objective lens having a relatively short back focus portion; b. first, second, and third pickup tubes, all being disposed in parallel with the optical axis of said objective lens; c. a diverging lens disposed in the back focus portion of said objective lens; d. a first color-separating filter disposed in the path of light from said diverging lens to separate the light from said diverging lens into a light beam including one color component light which is travelling in deviation from said optical axis of said objective lens, and another light beam including the remaining two color component lights which are travelling along the optical axis of said objective lens; e. a first mirror member disposed in the path of said light beam which is travelling in deviation from said optical axis to convert the same into a light beam which is travelling in parallel with said optical axis; f. a first converging lens disposed in the path of said one color component light beam to form an image on said first pickup tube; g. a second converging lens disposed in the path of said light beam including said remaining two color component lights from said first color-separating filter; h. a second color-separating filter disposed in the back focus portion of said second converging lens to separate the light beam from said second converging lens into a light beam including one color component light which is travelling in deviation from said optical axis of said objective lens, and another light beam including another color component light which is travelling along the optical axis of said objective lens; and j. a second mirror member disposed in the path of said light beam from said second color-separating filter, travelling in deviation from said optical axis, to convert the same into a light beam which is travelling in parallel with said optical axis.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |