Bar code reader using holograms
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United States of America Patent
Stats
-
Oct 6, 1992
Grant Date -
N/A
app pub date -
Aug 6, 1990
filing date -
Aug 4, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bar code reader includes a hologram receiving a scanning light beam in sequence from a scanning light beam source for directing the scanning light beam to a bar code to be read along one path so that the bar code is scanned with the scanning laser beam in two-dimensional directions, and for guiding the scanning light beam to a photo-detector along the same path after the scanning light beam is reflected from the bar code, a condenser lens disposed in an optical system between the photo-detector and the hologram for collecting the reflected scanning light beam into the photo-detector, and a light blocking member disposed in an optical system between the condenser lens and the hologram for blocking unwanted light from the photo-detector, which unwanted light advances toward an incident side of the hologram on which the scanning light beam is directed.
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