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US 6,538,243 B1Granted
Contact image sensor with light guide having least reflectivity near a light source
AssigneeHewlett-Packard Company
InventorsDavid D Bohn, Eugene A Miksch, Ruth Ann Davies, Keith M Mahoney
Life of this patent
Estimating the term…
Abstract
A contact image sensor includes a light sensitive optical detector and a light source mounted on a mounting surface. A light guide is located under the light source and is oriented to direct a light path from the light source to a scan line region under the light sensitive optical detector.
Claims19
A contact image sensor, comprising:
- at least one light source;
- and
- a light guide located under said at least one light source, said light guide having varied reflectivity levels, wherein said light guide is least reflective adjacent said at least one light source.
A method of producing a contact image sensor, comprising:
- mounting at least one light source in said contact image sensor;
- and
- positioning a light guide adjacent said at least one light source, said light guide having at least two portions with different levels of reflectivity, wherein said light guide is positioned so that a least reflective portion of said light guide is closest to said at least one light source.
A contact image sensor, comprising:
- a plurality of light sources mounted to a printed circuit board;
- and
- means for directing light from said plurality of light sources to a region under a plurality of photodetectors, wherein said means for directing light is least reflective adjacent each of said plurality of light sources and most reflective between each of said plurality of light sources.
Dependencies are inferred from the claim text.