Patent US4141641A successfully refreshed from Google Patents.
US4141641A
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 the mechanical contact therebetween. The tube is provided with a light transparent thin layer between the non-lens-like optical fiber face plate and the phosphor layer. The light transparent thin layer is a transparent plate and may include a spatial gap.
Inventors
- 👤 Kiyoshi Nagai
- 👤 Hitoshi Ikeda
- 👤 Takayuki Handa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:27
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J29/892
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
135 words
In an optical fiber cathode ray tube having an optical fiber stack face plate for forming an image at a position spaced from the outer surface of the face plate comprising a large number of parallel non-lens-like glass fibers of small diameter, each fiber of which is sheathed with a glass having a lower refractive index than that of the fiber glass, the fiber ends forming the inner and outer surfaces of the face plate and phosphor being deposited on the inner surface of the face plate, the improvement comprising a light transparent thin layer provided between said phosphor layer and said inner surface of said optical fiber stack face plate, whereby a substantially constant high image resolution is maintained within a distance less than about 0.2mm from the outer surface of the face plate.
Claim 2
Dependent Claim
135 words
In an optical fiber cathode ray tube having an optical fiber stack face plate for forming an image at a position spaced from the outer surface of the face plate comprising a large number of parallel non-lens-like glass fibers of small diameter, each fiber of which is sheathed with a glass having a lower refractive index than that of the fiber glass, the fiber ends forming the inner and outer surfaces of the face plate and phosphor being deposited on the inner surface of the face plate, the improvement comprising a light transparent thin layer provided between said phosphor layer and said inner surface of said optical fiber stack face plate, whereby a substantially constant high image resolution is maintained within a distance less than about 0.2mm from the outer surface of the face plate.
Claim 3
Dependent Claim
16 words
The improvement as claimed in claim 1, wherein said light transparent layer is 0.03-1mm in thickness.
Claim 4
Dependent Claim
27 words
The improvement as claimed in claim 2, wherein said light transparent layer is a light transparent plate of one selected from glass, ceramic and heat-resistant organic resin.
Claim 5
Dependent Claim
17 words
The improvement as claimed in claim 3, wherein said organic resin is one of polyamide and polyimide.
Claim 6
Dependent Claim
32 words
The improvement as claimed in claim 2, wherein said light transparent layer is a laminated light transparent plate of at least two layers, each selected from glass, ceramic and heat-resistant organic resin.
Claim 7
Dependent Claim
17 words
The improvement as claimed in claim 5, wherein said organic resin is one of polyamide and polyimide.
Claim 8
Dependent Claim
24 words
The improvement as claimed in claim 2, wherein said light transparent layer comprises at least one light transparent plate and at least one gap.
Claim 9
Dependent Claim
23 words
The improvement as claimed in claim 7, wherein said light transparent plate is of one selected from glass, ceramic and heat-resistant organic resin.
Claim 10
Dependent Claim
17 words
The improvement as claimed in claim 8, wherein said organic resin is one of polyamide and polyimide.
Claim 11
Dependent Claim
30 words
The improvement as claimed in claim 7, wherein said light transparent plate is a laminated plate of at least two layers each selected from glass, ceramic and heat-resistant organic resin.
Claim 12
Dependent Claim
17 words
The improvement as claimed in claim 10, wherein said organic resin is one of polyamide and polyimide.
Claim 13
Dependent Claim
174 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 non-lens-like glass fibers of small diameter, each fiber of which is sheathed with a glass having a lower refractive index than that of the fiber glass, the fiber ends forming the inner and outer surfaces of the face plate and phosphor being deposited on the inner surfaces of the face plate, the improvement wherein said cathode ray tube comprises a light transparent thin layer disposed between said phosphor layer and said inner surface of said optical fiber stack face plate, and said cathode ray tube and said photosensitive medium being disposed with a gap of about 500 μm or less between the face plate of said cathode ray tube and the photosensitive surface of said photosensitive medium so that said photosensitive surface is out of physical engagement with said face plate.
Claim 14
Dependent Claim
174 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 non-lens-like glass fibers of small diameter, each fiber of which is sheathed with a glass having a lower refractive index than that of the fiber glass, the fiber ends forming the inner and outer surfaces of the face plate and phosphor being deposited on the inner surfaces of the face plate, the improvement wherein said cathode ray tube comprises a light transparent thin layer disposed between said phosphor layer and said inner surface of said optical fiber stack face plate, and said cathode ray tube and said photosensitive medium being disposed with a gap of about 500 μm or less between the face plate of said cathode ray tube and the photosensitive surface of said photosensitive medium so that said photosensitive surface is out of physical engagement with said face plate.
Claim 15
Dependent Claim
23 words
The copy machine as claimed in claim 12, wherein said gap between said face plate and the photosensitive surface is about 500 μm.
References Cited (Backward Citations)
US3658407A
Cited
FR2025787A1
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 |