Combined range, turn parallel beam assembly with common focusing

Details Combined range, turn parallel beam assembly with common focusing Combined range, turn parallel beam assembly with common focusing

1995-05-30

1998-03-03

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

235472, G06K 710

Patent

active

057238510

ABSTRACT:
A combined range laser scanner and method for electro-optically reading indicia such as bar codes having parts of different light reflectivity which utilizes two laser diode optical illumination systems optimally focused for different working ranges. A first laser illumination system is optimized for contact operation and has a range extending to approximately two feet. The second laser illumination system is optimized for longer range scanning from approximately two to seventeen feet, and the two laser scanning systems are integrated into one combined range laser scanner. The combined range laser scanner incorporates therein logic circuitry which enables either laser illumination system as required fro the particular scanning application. Depending upon which laser illumination system is selected, the laser spot speed (e.g. amplitude of the drive signal for the scanning motor) is controlled to limit the frequency of received light signals to that of standard signal processing and decoding circuits. Scanning is achieved with a common oscillating mirror element driven by a scanning motor, and the amplitude of the applied scanning motor driving signal is greater for the first laser illumination system optimized for contact or short range operation and less for the second laser illumination system for longer range scanning.

REFERENCES:
patent: 4251798 (1981-02-01), Swartz et al.
patent: 4369361 (1983-01-01), Swartz et al.
patent: 4387297 (1983-06-01), Swartz et al.
patent: 4758717 (1988-07-01), Shepard et al.
patent: 4760248 (1988-07-01), Swartz et al.
patent: 4808804 (1989-02-01), Krichever et al.
patent: 4816661 (1989-03-01), Krichever et al.
patent: 4843222 (1989-06-01), Hochgraf
patent: 4871904 (1989-10-01), Metlitsky et al.
patent: 4877949 (1989-10-01), Danielson et al.
patent: 4920255 (1990-04-01), Gabeler
patent: 4939355 (1990-07-01), Rando et al.
patent: 5062115 (1991-10-01), Thornton
patent: 5073702 (1991-12-01), Schuhmacher
patent: 5084895 (1992-01-01), Shimada et al.
patent: 5115121 (1992-05-01), Bianco et al.
patent: 5122644 (1992-06-01), Hasegawa et al.
patent: 5420411 (1995-05-01), Salatto

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