US3925813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system for color television camera
Assignee: Fujinon Corp
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Filing: 1974-02-05
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Granted: 1975-12-09
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Expires: 1994-02-05
Abstract
Abstract An objective lens system for a double tube color television camera is divided into an afocal zooming lens component and a pair of focussing lens components. Between the zooming lens component and the pair of focussing lens components is disposed a color separating prism which divides the light into first light of first color directed to one of the focussing lens components and second light of second color directed to the other of the focussing lens components. A light deviating prism is inserted in one focussing lens component so that the light passing through the deviating prism may be directed in the direction parallel to the light passing through the other focussing lens component, so that two image pickup tubes may be oriented in parallel to each other.
Inventors
- 👤 Seiji Toyama
- 👤 Kazuo Yoshikawa
- 👤 Takeshi Higuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:32
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/1006; G02B27/1013; G02B27/14; G02B27/141; H; H04; H04N; H04N23/00; H04N23/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
130 words
An optical system for a double tube color television camera comprising an afocal objective lens component, a color separating optical means located behind said objective lens component for dividing the light incident thereto into first light carrying first color image information and second light carrying second color image information, a first focussing lens system located behind the color separating optical means for focussing said first light on a first image pickup tube of the camera, a second focussing lens system located beside the color separating optical means for focussing said second light on a second image pickup tube of the camera, and a light deviating means provided in said second focussing lens system for directing the second light in the direction parallel to the optical path of said first light.
Claim 2
Dependent Claim
130 words
An optical system for a double tube color television camera comprising an afocal objective lens component, a color separating optical means located behind said objective lens component for dividing the light incident thereto into first light carrying first color image information and second light carrying second color image information, a first focussing lens system located behind the color separating optical means for focussing said first light on a first image pickup tube of the camera, a second focussing lens system located beside the color separating optical means for focussing said second light on a second image pickup tube of the camera, and a light deviating means provided in said second focussing lens system for directing the second light in the direction parallel to the optical path of said first light.
Claim 3
Dependent Claim
46 words
An optical system for a double tube color television camera as defined in claim 1 wherein said light deviating means is an optical element having two reflecting surfaces arranged to reflect the second light from said color separating optical means toward the second image pickup tube.
Claim 4
Dependent Claim
107 words
An optical system for a double tube color television camera as defined in claim 2 wherein said light deviating means is a prism having a transmitting surface extending in perpendicular to the optical path of the second light coming from the color separating optical means, a first reflecting surface located behind the transmitting surface and extending skewly on the optical path of the second light passing through said transmitting surface, and a second reflecting surface extending skewly on the optical path of the second light reflected by said first reflecting surface to reflect the light in the direction parallel to the optical path of said first light.
Claim 5
Dependent Claim
43 words
An optical system for a double tube color television camera as defined in claim 3 wherein said prism is a triangular total reflection prism with an angle of 90* and a surface opposite to the angle of 90* is said first reflecting surface.
Claim 6
Dependent Claim
50 words
An optical system for a double tube color television camera as defined in claim 4 wherein one of the angles other than said angle of 90* is larger than 45* and the other is smaller than 45*, and the surface opposite to the latter angle is said second reflecting surface.
Claim 7
Dependent Claim
35 words
An optical system for a double tube color television camera as defined in claim 1 wherein said first color image information includes a color signal and said second color image information includes a brightness signal.
Claim 8
Dependent Claim
33 words
An optical system as defined in claim 6 wherein said color signal carries red and blue image information, and said second color image information also includes a color signal carrying green image information.
Claim 9
Dependent Claim
35 words
An optical system for a double tube color television camera as defined in claim 1 wherein said first color image information includes a brightness signal and said second color image information includes a color signal.
Claim 10
Dependent Claim
33 words
An optical system as defined in claim 8 wherein said color signal carries red and blue image information and said first color image information also includes a color signal carrying green image information.
Claim 11
Dependent Claim
141 words
An optical system as defined in claim 1 wherein said color separating optical means is a prism comprising a first transmitting surface extending perpendicular to the light incident thereto, a first reflecting surface located behind said first transmitting surface and extending skewly with respect to the light passing through said first transmitting surface, said first reflecting surface being provided with a dichroic layeR extending in contact therewith to reflect a part of the light and transmit the remainder, a second reflecting surface extending skewly on the optical path of the light reflected by said first reflecting surface, and a second transmitting surface extending in perpendicular to the optical path of the light reflected by said second reflecting surface, and a third transmitting surface extending behind said first reflecting surface in parallel to said first transmitting surface to pass the light therethrough.
Claim 12
Dependent Claim
32 words
An optical system as defined in claim 10 wherein said third transmitting surface is provided with a color filter to pass only the light which is to pass through said dichroic layer.
Claim 13
Dependent Claim
81 words
An optical system as defined in claim 10 wherein said prism comprises a first prism block and a second prism block attached to each other with said dichroic layer interposed therebetween, said first prism block having said first transmitting surface, said first reflecting surface and said second transmitting surface, and said second prism block having said third transmitting surface and a transmitting surface which is in direct contact with said dichroic layer and extending in parallel to said first reflecting surface.
Claim 14
Dependent Claim
42 words
An optical system as defined in claim 1 wherein said color separating optical means is an optical element including a dichroic filter which reflects a part of the light including brightness information and transmits the remainder of the light including color information.
Claim 15
Dependent Claim
42 words
An optical system as defined in claim 1 wherein said color separating optical means is an optical element including a dichroic filter which reflects a part of the light including color information and transmits the remainder of the light including brightness information.
Claim 16
Dependent Claim
139 words
An optical system for a double tube color television camera, comprising an afocal objective lens component; focusing lens system located behind said afocal objective lens component comprising a first focusing lens system for focusing light on a first image pick-up tube of the camera, and a second focusing lens system for focusing light on a second image pick-up tube of the camera; a color separating optical means located behind said objective lens component, and in front of said focusing lens system for dividing the light incident thereto into first light carrying first color image information and second light carrying second color image information; and a light deviating means located in said second focusing lens system and behind said color separating optical means for directing said second light in the direction parallel to the optical path of said first light.
Claim 17
Dependent Claim
139 words
An optical system for a double tube color television camera, comprising an afocal objective lens component; focusing lens system located behind said afocal objective lens component comprising a first focusing lens system for focusing light on a first image pick-up tube of the camera, and a second focusing lens system for focusing light on a second image pick-up tube of the camera; a color separating optical means located behind said objective lens component, and in front of said focusing lens system for dividing the light incident thereto into first light carrying first color image information and second light carrying second color image information; and a light deviating means located in said second focusing lens system and behind said color separating optical means for directing said second light in the direction parallel to the optical path of said first light.
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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |