Patent US4644155A successfully refreshed from Google Patents.
US4644155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reading optical system
Assignee: Canon Inc
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Filing: 1984-03-26
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Granted: 1987-02-17
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Expires: 2004-03-26
Abstract
Abstract A reading optical system comprises a transparent block a part of whose bottom surface is an inclined surface forming an angle with respect to the horizontal plane, combined light-guides embedded in the block and having one end thereof all disposed on the intermediate portion of the inclined surface spaced apart by a predetermined distance from the lower end of the inclined surface and the other end extending on the upper surface of the block, a light sensor installed on the upper surface of the block in opposed relationship with the other end of the combined light-guides, and an illuminating system for illuminating the vicinity of the surface of an original opposed to the one end of the combined light-guides, through the block.
Inventors
- 👤 Noritaka Mochizuki
- 👤 Chikara Jin
- 👤 Toshie Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:22
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/024; H04N1/028; H04N1/03; H04N1/031; H04N1/0311; H04N1/0312; H04N1/0315; H04N1/0317
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
182 words
A reading optical system comprising: a transparent block having an upper surface and a bottom surface, a part of said bottom surface being an inclined surface forming an angle with respect to a horizontal plane; light-guide means embedded in said block, said light-guide means having one end disposed on an intermediate portion of said inclined surface spaced apart by a predetermined distance from a lower end of said inclined surface and the other end of said light-guide means being disposed on the upper surface of said block, and said angle of said inclined surface being small enough to make a distance between the surface of an original document and said one end of said light-guide means sufficiently small to maintain a predetermined degree of resolution of reading the surface of the original document; a light sensor installed on said upper surface of said block in opposed relationship with said other end of said light-guide means; and an illuminating system for illuminating the vicinity of the surface of the original document opposed to said one end of said light-guide means, through said block.
Claim 2
Dependent Claim
182 words
A reading optical system comprising: a transparent block having an upper surface and a bottom surface, a part of said bottom surface being an inclined surface forming an angle with respect to a horizontal plane; light-guide means embedded in said block, said light-guide means having one end disposed on an intermediate portion of said inclined surface spaced apart by a predetermined distance from a lower end of said inclined surface and the other end of said light-guide means being disposed on the upper surface of said block, and said angle of said inclined surface being small enough to make a distance between the surface of an original document and said one end of said light-guide means sufficiently small to maintain a predetermined degree of resolution of reading the surface of the original document; a light sensor installed on said upper surface of said block in opposed relationship with said other end of said light-guide means; and an illuminating system for illuminating the vicinity of the surface of the original document opposed to said one end of said light-guide means, through said block.
Claim 3
Dependent Claim
21 words
A reading optical system according to claim 1, wherein said illuminating system is installed in a space formed in said block.
Claim 4
Dependent Claim
52 words
A reading optical system according to claim 2, wherein said illuminating system comprises a space formed in said block, the cross-section of said space forming a part of an ellipse and the inner surface of said space being a reflecting surface, and a light source disposed at one focus of said ellipse.
Claim 5
Dependent Claim
29 words
A reading optical system according to claim 1, wherein said light-guide means has a direction of propagation of light thereof oriented perpendicularly to the surface of the original document.
Claim 6
Dependent Claim
16 words
A reading optical system according to claim 1, wherein said light-guide means comprises combined light guides.
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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |