US5434680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image reader
Assignee: Omron Corp
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Filing: 1991-08-07
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Granted: 1995-07-18
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Expires: 2011-08-07
Abstract
Abstract An image scanner for a document incorporates a transparent member on a lower surface for passing reading and reflecting light while preventing entry of dust and foreign matter into the scanner housing. The transparent member is disposed so that at least the area which passes reflected light is located outside of the depth of field of the scanner optical system.
Inventors
- 👤 Atsushi Noda
- 👤 Haruyuki Koizumi
- 👤 Atsuo Nishijima
- 👤 Yuji Ohtsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:56
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/00909; H04N1/024; H04N1/028; H04N1/03; H04N1/04; H04N1/10; H04N1/107; H04N2201/00; H04N2201/024; H04N2201/02493; H04N2201/02495; H04N2201/028; H04N2201/03; H04N2201/031; H04N2201/03104; H04N2201/03108; H04N2201/03133; H04N2201/0315; H04N2201/0317
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
169 words
An image scanner, comprising: a light-emitting means for projecting light on a document, a light-receiving means for receiving reflected light from said document to read an image thereon, an optical system for focusing said reflected light on said light-receiving means, a sensor means for detecting a relative amount of movement between the reading position of said light receiving means and the position of the image on said document and a housing accommodating said respective means, wherein said housing is provided with a transparent member for passing said reflected light to said light-receiving means, said transparent member being disposed proximate to said optical system and said light-emitting means and spaced apart from the surface of said document in such a manner that at least its area transmitting the reflected light is located outside of the depth of field of said optical system; and wherein said transparent member has a curved portion which projects inwardly of said housing, said curved portion containing a surface defining said area transmitting the reflected light.
Claim 2
Dependent Claim
169 words
An image scanner, comprising: a light-emitting means for projecting light on a document, a light-receiving means for receiving reflected light from said document to read an image thereon, an optical system for focusing said reflected light on said light-receiving means, a sensor means for detecting a relative amount of movement between the reading position of said light receiving means and the position of the image on said document and a housing accommodating said respective means, wherein said housing is provided with a transparent member for passing said reflected light to said light-receiving means, said transparent member being disposed proximate to said optical system and said light-emitting means and spaced apart from the surface of said document in such a manner that at least its area transmitting the reflected light is located outside of the depth of field of said optical system; and wherein said transparent member has a curved portion which projects inwardly of said housing, said curved portion containing a surface defining said area transmitting the reflected light.
Claim 3
Dependent Claim
32 words
An image scanner as in claim 1, wherein said curved portion of said transparent member has another surface facing said light-emitting means for transmitting light from said light-emitting means to said document.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-07-17 | 1999-01-16 | 1999-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-17 | 2003-01-16 | 2003-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-17 | 2007-01-16 | 2007-07-18 | $7700.00 | Window Closed / Lapsed |