Multiple source optical scanner

Details Multiple source optical scanner Multiple source optical scanner

1993-05-20

1994-11-01

Sugarman, Scott J.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

235467, 2505781, G02B 2608, G06K 710

Patent

active

053611586

ABSTRACT:
A multiple source optical scanner which employs a plurality of scanning light sources to increase the total depth of field and the density of the overall scan pattern. In a first embodiment, the lasers are of different wavelengths and all on. Their individual depths of field are oriented end-to-end or in overlapping fashion. In a second embodiment, the lasers are of the same wavelength and are activated individually in sequence. Both embodiments employ collimating and focusing optics to produce scanning beams, collecting optics to collect light reflected from an article having a bar code label, and processing circuitry for generating signals having information about the articles based upon the intensities of the reflected light. The first embodiment additionally employs filter optics to separate the individual wavelengths of reflected light. Each wavelength of reflected light is processed through its own channel within the processing circuitry. The second embodiment employs modulation and control circuitry to turn each source on and off. A single channel is used for decoding.

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