Variable focus optical system for data reading

Details Variable focus optical system for data reading Variable focus optical system for data reading

1992-12-18

1994-09-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250568, 235472, G06K 710

Patent

active

053471210

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 LCD aperture with one or more aperture regions which are selectively or consecutively activated. The optical system therefore establishes two or more separate focal planes from a single light source resulting in greater depth of field or multiple depths of field.

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