Hand held bar code reader with modulated laser diode and detecto

Details Hand held bar code reader with modulated laser diode and detecto Hand held bar code reader with modulated laser diode and detecto

1986-02-27

1987-09-15

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214B, 235462, 235472, G06K 710

Patent

active

046941827

ABSTRACT:
A hand held bar code reader employs a laser diode as its laser source, for an efficient and compact construction. The diode is modulated, and an associated bar code reading detector is timed accordingly, so that (1) the effects of strong ambient light which may be present on the bar code surface can be subtracted out, by alternating reflected light readings of the detector between laser beam plus ambient and ambient alone, and subtracting the readings electronically, and (2) peak power can be increased to obtain more dependable readings while staying within permissible power levels for such devices, since average power is reduced by the modulation of the laser.

REFERENCES:
patent: 3867628 (1975-02-01), Brown
patent: 4047023 (1977-09-01), Key et al.
patent: 4160156 (1979-07-01), Sherer
patent: 4387297 (1983-06-01), Swartz et al.

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