US4141642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical fiber cathode ray tubes and copy machines using the same
Assignee: Japan Radio Co Ltd
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Filing: 1977-07-01
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Granted: 1979-02-27
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Expires: 1997-07-01
Abstract
Abstract An improved optical fiber cathode ray tube is provided which enables the recording of images on a recording medium with a high resolution even if the recording medium is disposed with an increased gap between the tube and the recording medium to prevent mechanical contact therebetween. The tube is provided with an additional stack of optical fibers facing the optical fiber face plate of the cathode ray tube with a light transparent thin layer being interposed between the face plate and the additional stack. The transparent thin layer may be a transparent plate and/or air gap. The stack of optical fibers may be in a form of an optical fiber plate or bundle.
Inventors
- 👤 Kiyoshi Nagai
- 👤 Hiroshi Ohashi
- 👤 Takao Ohiwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:23
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J29/892
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
123 words
In an optical fiber cathode ray tube having an optical fiber stack face plate comprising a large number of parallel glass fibers of small diameter, the fiber ends forming the inner and outer surfaces of the face plate. the improvement comprising an additional stack of optical fibers which is disposed facing said face plate of said cathode ray tube, with a light transparent thin layer being interposed between said face plate and said additional stack, said additional stack comprising a large number of parallel optical fibers of small diameter, each of the optical fibers being sheathed by a lower refractive material than the optical fiber, and the fiber ends forming a surface facing said face plate and a surface facing an opposite end.
Claim 2
Dependent Claim
123 words
In an optical fiber cathode ray tube having an optical fiber stack face plate comprising a large number of parallel glass fibers of small diameter, the fiber ends forming the inner and outer surfaces of the face plate. the improvement comprising an additional stack of optical fibers which is disposed facing said face plate of said cathode ray tube, with a light transparent thin layer being interposed between said face plate and said additional stack, said additional stack comprising a large number of parallel optical fibers of small diameter, each of the optical fibers being sheathed by a lower refractive material than the optical fiber, and the fiber ends forming a surface facing said face plate and a surface facing an opposite end.
Claim 3
Dependent Claim
26 words
The improvement as claimed in claim 1, wherein said light transparent thin layer comprises an air gap of from about 0.1 to about 0.2mm in thickness.
Claim 4
Dependent Claim
18 words
The improvement as claimed in claim 1, wherein said light transparent thin layer comprises a light transparent plate.
Claim 5
Dependent Claim
28 words
The improvement as claimed in claim 3, wherein said light transparent plate comprises at least one layer of at least one of glass, ceramic and heat-resistant organic resin.
Claim 6
Dependent Claim
17 words
The improvement as claimed in claim 4, wherein said organic resin is one of polyamide and polyimide.
Claim 7
Dependent Claim
162 words
In a copy machine comprising a cathode ray tube and a photosensitive medium which is movably disposed facing a face plate of the cathode ray tube, said cathode ray tube having an optical fiber stack face plate comprising a large number of parallel glass fibers of small diameter, the fiber ends forming the inner and outer surfaces of the face plate, the improvement comprising an additional stack of optical fibers provided between said face plate and said photosensitive medium, said additional stack comprising a large number of parallel optical fibers of small diameter, each of the optical fibers being sheathed by a lower refractive material than the optical fiber, the fiber ends forming opposite surfaces of said additional stack, one of said opposite surfaces facing said face plate with a light transparent thin layer therebetween, and the other of said opposite surfaces facing said photosensitive medium with an air gap therebetween to prevent said photosensitive medium from engaging with said additional stack.
Claim 8
Dependent Claim
162 words
In a copy machine comprising a cathode ray tube and a photosensitive medium which is movably disposed facing a face plate of the cathode ray tube, said cathode ray tube having an optical fiber stack face plate comprising a large number of parallel glass fibers of small diameter, the fiber ends forming the inner and outer surfaces of the face plate, the improvement comprising an additional stack of optical fibers provided between said face plate and said photosensitive medium, said additional stack comprising a large number of parallel optical fibers of small diameter, each of the optical fibers being sheathed by a lower refractive material than the optical fiber, the fiber ends forming opposite surfaces of said additional stack, one of said opposite surfaces facing said face plate with a light transparent thin layer therebetween, and the other of said opposite surfaces facing said photosensitive medium with an air gap therebetween to prevent said photosensitive medium from engaging with said additional stack.
Claim 9
Dependent Claim
19 words
The improvement as claimed in claim 6, wherein said additional stack of optical fibers comprises a lengthy optical bundle.
Claim 10
Dependent Claim
26 words
The improvement as claimed in claim 6, wherein said light transparent thin layer comprises an air gap of from about 0.1 to about 0.2mm in thickness.
Claim 11
Dependent Claim
18 words
The improvement as claimed in claim 6, wherein said light transparent thin layer comprises a light transparent plate.
Claim 12
Dependent Claim
28 words
The improvement as claimed in claim 9, wherein said light transparent plate comprises at least one layer of at least one of glass, ceramic and heat-resistant organic resin.
Claim 13
Dependent Claim
17 words
The improvement as claimed in claim 10, wherein said organic resin is one of polyamide and polyimide.
References Cited (Backward Citations)
US3658407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |