Patent US3922069A successfully refreshed from Google Patents.
US3922069A
Expired / Lapsed
US
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Color separating prism system
Assignee: Fujinon Corp
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Filing: 1974-03-21
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Granted: 1975-11-25
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Expires: 1994-03-21
Abstract
Abstract Three prism blocks are cemented together with two differently colored dichroic layers interposed between the two boundaries respectively. The first entrance face of the prism system serves as a total reflection face for totally reflecting the light reflected by the two dichroic layers. The light reflected totally by the entrance face is all directed to the same side of the nonreflecting optical axis so that the image pickup tubes to receive the light are located on the same side of the prism system.
Inventors
- 👤 Toshiro Kishikawa
- 👤 Kazuo Yoshikawa
- 👤 Toshiro Yamauchi
- 👤 Takeshi Higuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:23
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/1006; G02B27/1013; G02B27/14; G02B27/145
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
379 words
A color separating prism system adapted to be used for a color television camera having a non-reflecting optical axis consisting of a single totally reflecting surface and comprising: a first prism block having an entrance face extending across said non-reflecting optical axis, a first emanting face extending across said non-reflecting optical axis behind said entrance face and being inclined in one direction at an angle with respect to a plane parallel to said entrance face, and a second emanating face extending across said entrance face and said first emanating face for transmitting light rays reflected by said entrance face, said single totally reflecting surface being located on the rear of said entrance face and presented toward said first and second emanating faces; a second prism block having an entrance face and an emanating face both extending across said non-reflecting optical axis; a third prism block having an entrance face extending across said non-reflecting optical axis and being inclined in the same direction as that of said first emanating face of the first prism block at an angle with respect to the plane parallel to said entrance face, and an emanating face extending across the non-reflecting optical axis behind said entrance face thereof; a first dichroic layer which reflects a first color light component and transmits the remainder; and a second dichroic layer which reflects another color light component contained in said remainder transmitting through the first dichroic layer and transmits the remainder; said first dichroic layer being interposed in direct contact between said first emanating face of the first prism block and said entrance face of the second prism block without any air gap therebetween, said second dichroic layer being interposed in direct contact with said emanating face of the second prism block and said entrance face of the third prism block without any air gap therebetween; said first emanating face of the first prism block and said entrance face of the third prism block being so inclined that light rays reflecTed by the dichroic layers are reflected toward said single totally reflecting surface so that said light rays are totally reflected by said single totally reflecting surface located on the rear of said entrance face of the first prism block and emanate through said second emanating face thereof.
Claim 2
Dependent Claim
379 words
A color separating prism system adapted to be used for a color television camera having a non-reflecting optical axis consisting of a single totally reflecting surface and comprising: a first prism block having an entrance face extending across said non-reflecting optical axis, a first emanting face extending across said non-reflecting optical axis behind said entrance face and being inclined in one direction at an angle with respect to a plane parallel to said entrance face, and a second emanating face extending across said entrance face and said first emanating face for transmitting light rays reflected by said entrance face, said single totally reflecting surface being located on the rear of said entrance face and presented toward said first and second emanating faces; a second prism block having an entrance face and an emanating face both extending across said non-reflecting optical axis; a third prism block having an entrance face extending across said non-reflecting optical axis and being inclined in the same direction as that of said first emanating face of the first prism block at an angle with respect to the plane parallel to said entrance face, and an emanating face extending across the non-reflecting optical axis behind said entrance face thereof; a first dichroic layer which reflects a first color light component and transmits the remainder; and a second dichroic layer which reflects another color light component contained in said remainder transmitting through the first dichroic layer and transmits the remainder; said first dichroic layer being interposed in direct contact between said first emanating face of the first prism block and said entrance face of the second prism block without any air gap therebetween, said second dichroic layer being interposed in direct contact with said emanating face of the second prism block and said entrance face of the third prism block without any air gap therebetween; said first emanating face of the first prism block and said entrance face of the third prism block being so inclined that light rays reflecTed by the dichroic layers are reflected toward said single totally reflecting surface so that said light rays are totally reflected by said single totally reflecting surface located on the rear of said entrance face of the first prism block and emanate through said second emanating face thereof.
Claim 3
Dependent Claim
32 words
A color separating prism system for a color television camera as defined in claim 1 wherein said entrance face of the first prism block is substantially perpendicular to the non-reflecting optical axis.
Claim 4
Dependent Claim
36 words
A color separating prism system for a color television camera as defined in claim 2 wherein said emanating face of the third prism block is substantially parallel to the entrance face of the first prism block.
Claim 5
Dependent Claim
86 words
A color separating prism system for a color television camera as defined in claim 1 wherein said entrance face of the third prism block is further inclined at an angle with respect to the plane parallel to said first emanating face of the first prism block so that the light rays reflected by the second dichroic layer may be directed in a direction inclined at an acute angle with respect to the direction in which the light rays reflected by the first dichroic layer are directed.
Claim 6
Dependent Claim
80 words
A color separating prism system for a color television camera as defined in claim 4 wherein said angle at which the entrance face of the third prism block is inclined with respect to the plane parallel to said first emanating face of the first prism block is the same as the angle at which said first emanating face of the first prism block is inclined with respect to the plane parallel to said entrance face of the first prism block.
Claim 7
Dependent Claim
57 words
A color separating prism system for a color television camera as defined in claim 5 wherein said second emanating face of the first prism block comprises two emanating faces which are inclined at an angle to each other and are substantially perpendicular to the optical axes of the light rays reflected by the two dichroic layers, respectively.
Claim 8
Dependent Claim
79 words
A color separating prism system for a color television camera as defined in claim 4 wherein said direction in which the entrance face of the third prism block is inclined with respect to the plane parallel to said first emanating face of the first prism block is different from the direction in which said first emanating face of the first prism block is inclined with respect to the plane parallel to said entrance face of the first prism block.
Claim 9
Dependent Claim
128 words
A color separating prism system for a color television camera as defined in claim 7 wherein said first emanating face of the first prism block is so inclined that the first dichoric layer adjacent thereto may reflect the light rays incident thereto coming along the non-reflecting optical axis obliquely upward in a vertical plane including the non-reflecting optical axis toward the entrance face of the first prism block, and said entrance face of the third prism block is so inclined that the second dichroic layer adjacent thereto may reflect the light rays incident thereto coming along the non-reflecting optical axis obliquely upward in a plane including the non-reflecting optical axis and rotated at an angle from said vertical plane toward the entrance face of the first prism block.
Claim 10
Dependent Claim
123 words
A color separating prism system for a color television camera as defined in claim 8 wherein said second emanating face of the first prism block comprises a top face extending across the entrance face and the first emanating face of the first prism block in perpendicular to the optical axis of the light rays reflected from the first dichroic layer and totally reflected by the entrance face of the first prism block, and a side face extending across the entrance face and the first emanating face of the first prism block and said top face in perpendicular to the optical axis of the light rays reflected from the second dichroic layer and totally reflected by the entrance face of the first prism block.
Claim 11
Dependent Claim
82 words
A color separating prism system for a color television camera as Defined in claim 1 wherein said entrance face of the first prism is inclined with respect to a plane perpendicular to the non-reflecting optical axis and an additional prism block is provided in front of the first prism block, said additional prism block having an entrance face extending in perpendicular to the non-reflecting optical axis and an emanating face extending in parallel to the entrance face of the first prism block.
Claim 12
Dependent Claim
168 words
A color separating prism system for a color television camera consisting of a single totally reflective surface and comprising an intermediate prism block having non-parallel opposite faces, differently colored dichroic layers applied on said faces of the intermediate prism block respectively, a front prism block having an entrance face and cemented on one of said faces with one of said dichroic layers interposed without any air gap therebetween, said single totally reflecting surface being located on the rear of said entrance face and presented toward said intermediate prism, and a rear prism block cemented on the other of said faces with the other of said dichroic layers interposed without any air gap therebetween, whereby two different color light components of the light passing through said prism blocks are reflected respectively by said dichroic layers and totally reflected by said single totally reflecting surface on said entrance face of the front prism block and emanate from the front prism block through and emanating face of the first prism block.
Claim 13
Dependent Claim
168 words
A color separating prism system for a color television camera consisting of a single totally reflective surface and comprising an intermediate prism block having non-parallel opposite faces, differently colored dichroic layers applied on said faces of the intermediate prism block respectively, a front prism block having an entrance face and cemented on one of said faces with one of said dichroic layers interposed without any air gap therebetween, said single totally reflecting surface being located on the rear of said entrance face and presented toward said intermediate prism, and a rear prism block cemented on the other of said faces with the other of said dichroic layers interposed without any air gap therebetween, whereby two different color light components of the light passing through said prism blocks are reflected respectively by said dichroic layers and totally reflected by said single totally reflecting surface on said entrance face of the front prism block and emanate from the front prism block through and emanating face of the first prism block.
Claim 14
Dependent Claim
38 words
A color separating prism system as defined in claim 11 wherein said two color light components are reflected by the dichroic layers to the same side of the optical path of the light passing through the prism blocks.
References Cited (Backward Citations)
US3202039A
Cited
US3718752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |