Facsimile and static presentation processing – Facsimile – Picture signal generator
Patent
1996-06-17
2000-07-11
Coles, Edward L.
Facsimile and static presentation processing
Facsimile
Picture signal generator
358482, 358483, 25020801, 359207, 359708, 359558, H04N 104, G01B 904, G02B 2608, G02B 302
Patent
active
060881348
ABSTRACT:
The invention is a system for scanning a document. A light source illuminates the document; an imager receives light from the document and directs it toward a detector array which produces a corresponding array of electrical signals. The imager has several optical properties that are useful either individually or in combination. The imager is telecentric and thereby ensures that image size and magnification are insensitive to object displacement along the optical axis and image brightness is uniform independent of object off-axis distance. An aspheric element within the imager balances focus variation within the depth of field with spherical aberration and thereby provides nearly uniform image resolution. A diffraction pattern, carried by the imager, corrects for spectral dispersion which occurs when light passes from air into a refractive material. An imager with a reflecting surface provides a system that is subject to little or no chromatic aberration. A solid imager with multiple internal reflecting surfaces in optical series, configured to include the previously mentioned optical properties, also provides for highly stable alignment of reflecting surfaces.
REFERENCES:
patent: 4523093 (1985-06-01), Neumann
patent: 4739414 (1988-04-01), Pryor et al.
patent: 4929066 (1990-05-01), Wakimoto et al.
patent: 5257133 (1993-10-01), Chen
patent: 5671080 (1997-09-01), Mihara
patent: 5822073 (1998-10-01), Yee et al.
Coles Edward L.
Hewlett--Packard Company
Lamb Twyler
Potts Jerry R.
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