US4598228A
Expired / Lapsed
US
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High resolution output structure for an image tube which minimizes Fresnel reflection
Assignee: Toshiba Corp
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Filing: 1984-04-26
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Granted: 1986-07-01
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Expires: 2004-04-26
Abstract
Abstract A phosphor screen which has an optical fiber plate formed of a number of bundled single optical fibers, each of which fibers consists essentially of a cylindrical core and a clad surrounding the curved peripheral wall of the core and a phosphor layer formed on one surface of the optical fiber plate, characterized in that the cylindrical core on the other surface of the optical fiber plate is removed, to provide a depression of a depth of at least 1 μm, thereby producing an image having high contrast.
Inventors
- 👤 Yoshiharu Obata
- 👤 Takashi Noji
- 👤 Masahiro Sugiyama
- 👤 Shigeharu Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:02
CPC Classifications
G; G21; G21K; G21K4/00; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/24
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
125 words
An output structure for an image tube, comprising: an optical fiber plate including a plurality of optical fibers, each said fiber including a core and a clad surrounding said core, each said fiber having a first and a second end surface, one of said end surfaces being formed with a depression of at least 1 μm in said core so that each said clad extends further away from the other end surface than does each said core; a phosphor layer formed on said first end surface of said optical fiber plate; and an output window, opposed to said second end surface of said fiber plate, wherein said output window does not extend within said depressions said optical fiber plate reducing the normally expected fresnel reflection.
Claim 2
Dependent Claim
125 words
An output structure for an image tube, comprising: an optical fiber plate including a plurality of optical fibers, each said fiber including a core and a clad surrounding said core, each said fiber having a first and a second end surface, one of said end surfaces being formed with a depression of at least 1 μm in said core so that each said clad extends further away from the other end surface than does each said core; a phosphor layer formed on said first end surface of said optical fiber plate; and an output window, opposed to said second end surface of said fiber plate, wherein said output window does not extend within said depressions said optical fiber plate reducing the normally expected fresnel reflection.
Claim 3
Dependent Claim
18 words
The structure according to claim 1, wherein the diameter of said cylindrical core is 15 μm or less.
Claim 4
Dependent Claim
36 words
The structure according to claim 1, wherein said depressions are formed by removing the end of said core and the end inner surface of said clad on the second end surface of said optical fiber plate.
Claim 5
Dependent Claim
42 words
The structure according to claim 1, further comprising a light-shielding layer, formed between said optical fibers, and wherein said depressions are formed by removing the ends of said core and said clad on said second end surface of said optical fiber plate.
Claim 6
Dependent Claim
24 words
The structure according to claim 1, wherein said core on said first end surface of said optical plate is removed to form the depressions.
Claim 7
Dependent Claim
20 words
The structure according to claim 1, further comprising a light absorbing layer formed on a side wall of said depression.
Claim 8
Dependent Claim
15 words
A structure as in claim 1 wherein each said core of said fibers is cylindrical.
Claim 9
Dependent Claim
27 words
A structure as in claim 1 further comprising a light absorbing layer, formed on an end surface of a projection which remains when said depression is formed.
Claim 10
Dependent Claim
20 words
The structure according to claim 8, wherein the end surface of said projection is an end surface of said clad.
Claim 11
Dependent Claim
35 words
The structure according to claim 8, wherein a light-shielding layer is formed between said single optical fibers, and the end surface of said projection is end surfaces of said clad and of said light-shielding layer.
Claim 12
Dependent Claim
28 words
A structure as in claim 6 wherein said light absorbing layer is also formed on an end surface of a projection which remains when said depression is formed.
Claim 13
Dependent Claim
20 words
The structure according to claim 11, wherein the end surface of said projection is an end surface of said clad.
Claim 14
Dependent Claim
35 words
The structure according to claim 11 wherein a light-shielding layer is formed between said single optical fibers, and the end surface of said projection is end surfaces of said clad and of said light-shielding layer.
Claim 15
Dependent Claim
23 words
The structure as in claim 5 wherein each said fiber is also formed with a depression in the core of said first end.
Claim 16
Dependent Claim
93 words
An optical fiber plate for use with an image tube, comprising: means for irradiating a light wave in response to an input excitation; and a plurality of optical fibers having a first and second end surface, each said fiber including a central core area, and an outer clad area, said first end surface of said optical fibers being adjacent to said irradiating means, and one of said end surfaces being formed with a depression only in said core, but not in said clad said optical fiber plate reducing the normally expected fresnel reflection.
Claim 17
Dependent Claim
93 words
An optical fiber plate for use with an image tube, comprising: means for irradiating a light wave in response to an input excitation; and a plurality of optical fibers having a first and second end surface, each said fiber including a central core area, and an outer clad area, said first end surface of said optical fibers being adjacent to said irradiating means, and one of said end surfaces being formed with a depression only in said core, but not in said clad said optical fiber plate reducing the normally expected fresnel reflection.
Claim 18
Dependent Claim
15 words
A fiber plate as in claim 15 wherein said clad includes a light shielding layer.
Claim 19
Dependent Claim
15 words
A fiber plate as in claim 15 wherein said depressions are greater than 1 μm.
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) | 1989-06-30 | 1989-12-30 | 1990-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-30 | 1993-12-30 | 1994-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-30 | 1997-12-30 | 1998-07-01 | $7700.00 | Window Closed / Lapsed |