Optical scanner with extended depth of focus

Details Optical scanner with extended depth of focus Optical scanner with extended depth of focus

1991-06-14

1993-05-11

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

235472, G06K 710

Patent

active

052103986

ABSTRACT:
An optical bar code scanner and method which achieves an extended depth of focus by employing a multifocal length collection optical system. A radiation beam is generated for illuminating a field of view, either by a laser or nonlaser source. The embodiments specifically disclosed herein employ nonlaser sources such as LEDs. The multifocal length collection optical system consisting of a plurality of lenses or mirrors having at least a near range focal length and a long range focal length, simultaneously collects radiation reflected from objects in the field of view, and directs it to an optical detector for detection and generation of an electrical output signal indicative thereof. The electrical output signal of the detector is then passed through a high pass filter which filters out a DC background electrical signal, thereby improving the depth of modulation of the signal.

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