Patent US3589817A successfully refreshed from Google Patents.
US3589817A
Expired / Lapsed
US
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Photoelectric web defect-detecting apparatus which provides for overcoming the ray-diverging effect of roller curvature
Assignee: Fujifilm Holdings Corp
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Filing: 1969-02-27
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Granted: 1971-06-29
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Expires: 1989-02-27
Abstract
Abstract Apparatus for optically detecting imperfections on the surface of a web which is being advanced on a roller. The apparatus comprises a light source for directing light rays onto the surface of the web on the roller, a lens assembly disposed between the light source and the roller for directing parallel light rays toward the web surface, and an optical system for directing the reflected light rays to a photoconductive element.
Inventors
- 👤 Fumio Sugaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:12
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/8901
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
156 words
In an apparatus for detecting the imperfections on the surface of a web wherein a roller is provided for feeding the web, a light source is provided for directing the light rays onto the surface of the web which moves along the roller, and an optical system is provided for directing the reflected light rays from the surface of the web to a photoconductive element; the improvement comprising a first lens disposed between said light source and said roller for making said light rays from said light source parallel with one another, and a second lens disposed between said first lens and said roller for concentrating the parallel rays formed by said first lens onto the web surface in the form of a wedge, the focal point of said second lens being positioned beyond the surface of the web on the roller so that most of the light rays will be reflected in the same direction.
Claim 2
Dependent Claim
156 words
In an apparatus for detecting the imperfections on the surface of a web wherein a roller is provided for feeding the web, a light source is provided for directing the light rays onto the surface of the web which moves along the roller, and an optical system is provided for directing the reflected light rays from the surface of the web to a photoconductive element; the improvement comprising a first lens disposed between said light source and said roller for making said light rays from said light source parallel with one another, and a second lens disposed between said first lens and said roller for concentrating the parallel rays formed by said first lens onto the web surface in the form of a wedge, the focal point of said second lens being positioned beyond the surface of the web on the roller so that most of the light rays will be reflected in the same direction.
Claim 3
Dependent Claim
43 words
The apparatus of claim 1 wherein said optical system comprises a vibrating mirror, and a third lens disposed near said roller for directing the reflected light rays toward said vibrating mirror, said vibrating mirror directing the reflected light rays toward said photoconductive element.
Claim 4
Dependent Claim
21 words
The apparatus of claim 2 further comprising an amplifier, a discriminating circuit and a memory circuit connected to said photoconductive element.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |