Patent US4518864A successfully refreshed from Google Patents.
US4518864A
Expired / Lapsed
US
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Image reader with a light diffuser
Assignee: Fujifilm Holdings Corp
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Filing: 1984-09-12
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Granted: 1985-05-21
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Expires: 2004-09-12
Abstract
Abstract An image reader in which sensitivity fluctuations of a solid-state image pickup device are eliminated. The imaging rays of a picture to be read are applied with diffusion to the surface of the solid-state image pickup device. The diffusion may be supplied by the use of a diffused light source such as a fluorescent lamp, a number of spot light sources, or a tungsten light source with a diffusing plate. Otherwise, the incident light can be diffused immediately adjacent the surface of the solid-state image pickup device with a light-diffusing plate.
Inventors
- 👤 Masafumi Inuiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:02
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/024; H04N1/028; H04N1/02815; H04N1/0282; H04N1/02845; H04N1/0287; H04N1/02885; H04N1/0289; H04N1/02895; H04N1/03; H04N2201/00; H04N2201/024; H04N2201/02493
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
An image reader having a solid-state image pickup device consisting of a plurality of photosensitive elements having a surface layer which interferes with light in a photosensitive wavelength range of said solid-state image pickup device, the improvement comprising a diffusing plate disposed adjacent said surface layer for overcoming the interference of said surface layer, said diffusing plate applying light bearing data of a picture to be read to said solid-state image pickup device in a manner that the diffused light to one photosensitive element does not substantially overflow to neighboring photosensitive elements in said pickup device.
Claim 2
Dependent Claim
96 words
An image reader having a solid-state image pickup device consisting of a plurality of photosensitive elements having a surface layer which interferes with light in a photosensitive wavelength range of said solid-state image pickup device, the improvement comprising a diffusing plate disposed adjacent said surface layer for overcoming the interference of said surface layer, said diffusing plate applying light bearing data of a picture to be read to said solid-state image pickup device in a manner that the diffused light to one photosensitive element does not substantially overflow to neighboring photosensitive elements in said pickup device.
References Cited (Backward Citations)
US3645626A
Cited
US4065788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |