Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-05-19
1999-08-31
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250568, 235472, G06K 710
Patent
active
059456701
ABSTRACT:
An optical system and method for data reading in which a light source generates an optical beam directed toward an object to be read and a variable aperture mechanism positioned in the outgoing light path establishes at least two separate focal planes. The variable aperture device may comprise a variable aperture system in which the size of the aperture is selectively varied about a range within the diffractive limit of the light beam. A preferred aperture mechanism is an electronically actuable mechanism with no moving parts which may include a liquid crystal aperture with one or more aperture regions which are selectively or consecutively activated. The optical system therefore establishes two or more separate waist locations from a single light source resulting in greater depth of field or multiple depths of field.
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Allen Stephone
Spectra-Physics Scanning Systems, Inc.
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