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US 5,841,128 AGranted
Optical sensor for reading a pattern
AssigneeOki Electric Industry Co., Ltd.
InventorsYoshiki Shibuya, Takeo Ando, Mayumi Masui
Life of this patent
Estimating the term…
Abstract
An optical read sensor includes a circuit board having light-emitting elements mounted thereon, a transparent cover on which an original to be read is placed, light-receiving elements, and a light-guide that guides the light reflected by the original to the light-receiving elements. The light-emitting elements emit light toward the original. The original reflects the light emitted from the light-emitting elements through the transparent cover. The light guide guides the light reflected by the original to the light-receiving elements.
Claims23
An optical read sensor, comprising:
- a circuit board having light-emitting elements mounted thereon, said light-emitting elements emitting light;
- a transparent cover having a surface on which an original is placed;
- light-receiving elements, receiving light reflected by the original through said transparent cover;
- and
- a lens array formed of a plurality of optical fibers arranged in parallel in a row, each of the optical fibers having an optical axis with a first focal point on a light incidence side and second focal point on a light exiting side, said lens array guiding the light reflected by the original to said light-receiving elements;
- wherein the light emitted from said light-emitting elements has a substantially uniform distribution of intensity in a volume parallel to the surface of the transparent cover after the light has passed through the transparent cover, the volume being within a predetermined range of distance from the transparent cover, the optical axis passing through the volume.
3 more elements
Dependencies are inferred from the claim text.