Patent US4647153A successfully refreshed from Google Patents.
US4647153A
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US
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Image guide
Assignee: Dainichi Nippon Cables Ltd
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Filing: 1985-07-19
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Granted: 1987-03-03
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Expires: 2005-07-19
Abstract
Abstract The invention relates to improvements in an image guide using optical silica glass fibers. The improved image guide has a light shielding and light absorbing thin layer formed on the periphery of an optical fiber bundle consisting of a multiplicity of optical fibers to prevent incidence of external light from the peripheral surface of the bundle and to absorb and remove any scattered light as it is transmitted to parts other than the core of each optical fiber, thereby providing improved picture quality.
Inventors
- 👤 Atsushi Utsumi
- 👤 Hiroyuki Hayami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:34
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/24; G02B23/26
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
105 words
An image guide consisting essentially of a thin layer formed on the outer periphery of a bundle-form assembly comprising a multiplicity of optical silica glass fibers, said layer having light shielding and light absorption properties, said silica glass fibers comprising a core made of substantially pure silica, a cladding around said core made of silica glass doped with B 2 O 3 or B 2 O 3 and F and a support layer around said cladding made of silica glass, the support layers of adjacent fibers being fusion bonded to each other and there being no clearance between said thin layer and said bundle-form assembly.
Claim 2
Dependent Claim
105 words
An image guide consisting essentially of a thin layer formed on the outer periphery of a bundle-form assembly comprising a multiplicity of optical silica glass fibers, said layer having light shielding and light absorption properties, said silica glass fibers comprising a core made of substantially pure silica, a cladding around said core made of silica glass doped with B 2 O 3 or B 2 O 3 and F and a support layer around said cladding made of silica glass, the support layers of adjacent fibers being fusion bonded to each other and there being no clearance between said thin layer and said bundle-form assembly.
Claim 3
Dependent Claim
16 words
An image guide as set forth in claim 1, wherein said thin layer is heat resistant.
Claim 4
Dependent Claim
29 words
An image guide as set forth in claim 2, wherein on the outer side of said thin layer there is provided a protective layer formed of a heat-resistant material.
Claim 5
Dependent Claim
23 words
An image guide as set forth in claim 1, wherein said thin layer is bonded to the outer surface of the bundle-form assembly.
Claim 6
Dependent Claim
29 words
An image guide as set forth in claim 4, wherein said thin layers is of organic or inorganic black paint, coal tar, carbon soot, black rubber, or black plastic.
Claim 7
Dependent Claim
35 words
An image guide as set forth in claim 4, wherein said thin layer contains one or more kinds of materials such as carbon pigment, copper oxide, manganese oxide, nickel oxide, cobalt oxide, and iron oxide.
Claim 8
Dependent Claim
29 words
An image guide as set forth in claim 6, wherein on the outer side of said thin layer there is provided a protective layer formed of a heat-resistant material.
Claim 9
Dependent Claim
28 words
An image guide as set forth in claim 1, wherein said thin layer is bonded to the outer periphery of a tubular skin layer enclosing said bundle-form assembly.
Claim 10
Dependent Claim
29 words
An image guide as set forth in claim 8, wherein said thin layer is of organic or inorganic black paint, coal tar, carbon soot, black rubber, or black plastic.
Claim 11
Dependent Claim
35 words
An image guide as set forth in claim 8, wherein said thin layer contains one or more kinds of materials such as carbon pigment, copper oxide, manganese oxide, nickel oxide, cobalt oxide, and iron oxide.
Claim 12
Dependent Claim
29 words
An image guide as set forth in claim 10, wherein on the outer side of said thin layer there is provided a protective layer formed of a heat-resistant material.
Claim 13
Dependent Claim
29 words
An image guide as set forth in claim 1, wherein said thin layer is of organic or inorganic black paint, coal tar, carbon soot, black rubber, or black plastic.
Claim 14
Dependent Claim
35 words
An image guide as set forth in claim 1, wherein said thin layer contains one or more kinds of materials such as carbon pigment, copper oxide, manganese oxide, nickel oxide, cobalt oxide, and iron oxide.
Claim 15
Dependent Claim
29 words
An image guide as set forth in claim 13, wherein on the outer side of said thin layer there is provided a protective layer formed of a heat-resistant material.
Claim 16
Dependent Claim
19 words
The image guide according to claim 1 wherein there is employed 3% B 2 O 3 and 1% F.
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) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |