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Multidirectional optical scanner
| Details |
Inventors: Metlitsky, Boris; Krichever, Mark J.;
Assignee: Symbol Technologies, Inc. (Bohemia, NY)
Primary Examiner: Trafton; David L.
Assistant Examiner:
Attorney, Agent or Firm: Kirschstein, Ottinger, Israel & Schiffmiller
A multidirectional scan pattern is generated by two mirrors, each inclined at a tilt angle and rotated about an axis at an angular speed. The size and shape of the pattern are controlled by adjusting the tilt angles and the angular speeds. |
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DETAILED DESCRIPTION 1.
Objects of the Invention It is a general object of this invention to overcome the drawbacks, and advance the state of the art, of optical scanners, particularly bar code symbol readers.
It is another object of this invention to change the size and/or configuration of a multidirectional scan pattern.
Another object of this invention is to readily change the size and/or configuration of the scan pattern either prior to, or during, use of the scanner.
A further object of this invention is to optimize the size and/or configuration of the scan pattern.
Still another object of this invention is to enable either the user and/or the manufacturer of the scanner to readily change the size and/or configuration of the scan pattern.
Yet another object of this invention is to provide a scanner of the moving light beam type, wherein a scanning light beam spot is always in the scan pattern and travels at a non-zero velocity during scanning of a symbol.
Another object of this invention is to provide a scanner of the moving light beam type, wherein the scanning light beam spot has a velocity variation during scanning which is less than that normally encountered in known scan patterns.
Still a further object of this invention is to generate a scan pattern having an N-fold symmetry and a 100% scanning efficiency, the pattern being equally and highly dense over the field of view.
Yet a further object of this invention is to reliably read height-truncated or stationary symbols by precessing a scan pattern about an axis generally perpendicular to the plane in which the symbol to be read lies.
A further object of this invention is to provide a multidirectional scan pattern generator of simple, miniature, lightweight, rugged construction.
2.
Features of the Invention In keeping with these objects, and others which will become apparent hereinafter, one feature of this invention resides, briefly stated, in a multidirectional optical scanner for, and a scanning method of, multidirectionally scanning either a light-reflecting target located in the vicinity of a reference plane and/or a field of view of light reflected from the target, by forming a multidirectional scan pattern in the reference plane
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Optical Systems 
