Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-12-16
1990-04-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250236, 350 68, G06K 710, H01J 516
Patent
active
049163183
ABSTRACT:
A scan-type optical reader having a laser source used for reading information on a subject such as, for example, a bar code. A deflecting optical member deflects a laser beam emitted from the laser source to the subject to be scanned. In the reader there is a projecting lens displaced between the laser source and the deflecting optical member. A light-receiving member receives the laser beam reflected by the subject matter scanned in order to read the information on the subject matter. An optical member, such as a plane parallel plate, is moved back and forth in the beam of the laser source to change the beam waist of the laser beam.
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Asahi Kogaku Kogyo K.K.
Messinger Michael
Nelms David C.
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