Symbol reading device for varying the focal point of a scanning

Details Symbol reading device for varying the focal point of a scanning Symbol reading device for varying the focal point of a scanning

1993-03-19

1994-08-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235467, 359218, G06K 710

Patent

active

053409825

ABSTRACT:
In a symbol reading device, at least two laser beams having different optical path lengths, and, therefore, different focal positions are used to scan a symbol surface. The two laser beams are produced from a single beam issuing unit, and only one beam at a time scans the symbol surface. Furthermore, stationary reflecting mirrors are used to create the two laser beams of different focal length, reducing the number of moving mechanisms and the overall complexity of the device.

REFERENCES:
patent: 4101193 (1978-07-01), Waterworth et al.
Patent Abstracts of Japan, vol. 8, No. 137 (p. 282) 26 Jun. 1984.

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