Omnidirectional optical scanner

Details Omnidirectional optical scanner Omnidirectional optical scanner

G - Physics

06

K

354/56

G06K 7/10 (2006.01) G08C 9/06 (1980.01)

Patent

CA 1051553

ABSTRACT OF THE DISCLOSURE An omnidirectional optical scanner scans bar coded labels passed relative to a rectangular scan window with a plurality of interlaced X's whereby the labels are completely scanned irrespective of their orientation. The interlaces X's are generated from a laser light source directed onto a first oscillating mirror for deflecting the light beam in a horizontal direction at a slow frequency. A second oscillating mirror is positioned to further deflect the light beam in a vertical direction at a higher frequency. The horizontal and vertical frequencies are set at a particular ratio so that the X's overlap and the scan on the return passes midway between the legs of a previous scan. The horizontal and vertical amplitudes are controlled by horizontal and vertical photo detectors located adjacent the scan window which provide inputs to amplitude control circuits to assure an orthogonal pattern by keeping the crossing angle constant. The oscillating mirrors are phase and frequency locked by a precision digital system to assure phase lock stability and thereby prevent voids in the scan pattern. The scan window crops out the end portions of the scan pattern. Generally, the most linear parts of the scan pattern, but including the turn around portions of the scans within the scan window are used. However. in one embodiment, end mirrors fold the end portions of the scan pattern outside of the window into the scan window toward the center thereof to enhance the scanning of certain labels.

203370

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