Hand-held instant bar code reader having automatic focus control for operation over a range of distances
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United States of America Patent
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-
May 3, 1994
Issued Date -
N/A
app pub date -
Sep 16, 1992
filing date -
Aug 8, 1986
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A hand-held bar code reader includes one or more photosensor arrays which provide a plurality of image sensor portions arranged for receiving images of a bar code through a plurality of selectively usable paths of different focal lengths which are defined by a passive optical system. A distance measuring system controls the sensor portion which is used to control the focal length. In one embodiment, the bar code image is projected to a plurality of receiving mirror surfaces, thence to a plurality of additional mirror surfaces and thence through lens barrels to mirrors which project the images to photosensor arrays. In another, the bar code image is projected to a plurality of receiving mirror surfaces, thence to an additional mirror surface, and thence through a single lens barrel to a mirror which projects the images to a photosensor array.
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