Registers – Coded record sensors – Particular sensor structure
Patent
1993-06-18
1995-08-01
Shepperd, John
Registers
Coded record sensors
Particular sensor structure
235467, 235472, 359204, G06K 710
Patent
active
054381878
ABSTRACT:
An optical system and method for data reading having a light source which generates an optical beam directed toward an object to be read and a focusing system in the outgoing light path which establishes multiple beam functions. In a preferred application, a scanning system includes a multifocal lens having a single lens element having an inner lens portion of a first focal length and an outer annular lens portion with a second focal length, the scanning system therefore establishing two separate focal positions from a single light source. Alternately, the system includes a focusing lens system with an corrector element disposed in the outgoing optical path, the corrector element having a plurality of optical zones, each zone having a different optical characteristic for modifying a portion of the outgoing optical beam. A zone may be a refractive region, a reflective region, a diffractive region, an empty region, a window region, or combinations thereof.
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Arends Thomas C.
Reddersen Brad R.
Shepperd John
Spectra-Physics Scanning Systems, Inc.
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