Bar code reader having means for switching between drives of a p

Details Bar code reader having means for switching between drives of a p Bar code reader having means for switching between drives of a p

1994-12-27

1996-04-23

Pitts, Harold

Registers

Coded record sensors

Particular sensor structure

235462, G06K 710

Patent

active

055106056

ABSTRACT:
A plurality of semiconductor laser diodes are disposed so as to emit laser beams whose optical axes extend in different directions. The laser beam emitted from the plurality of semiconductor laser diodes is deflected by a polygon mirror and then reflected by pattern forming mirrors, to thereby form a combined scanning pattern. Although the combined scanning pattern consists of a plurality of cross patterns that are arranged as connected without being overlapped with each other, it actually has the same reading area as a single large cross pattern. Scattered light produced by scanning a bar code symbol by means of the combined scanning pattern is subjected to photoelectric conversion, and a resulting signal is decoded. To form the combined scanning pattern, the rotational angle of the polygon mirror is detected and drives of the plurality of semiconductor laser diodes are switched at high speed based on the detection result.

REFERENCES:
patent: 4816569 (1989-03-01), Bianco
patent: 5028770 (1991-07-01), Miyazaki et al.

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