Optical scanning head

Details Optical scanning head Optical scanning head

1994-09-16

1996-07-02

Pitts, Harold

Registers

Coded record sensors

Particular sensor structure

235455, G06K 710

Patent

active

055324673

ABSTRACT:
The optical scanning head includes at least one trio of light emitting diodes arranged so the LEDs emit light at different angles to create a fan of light. An optical module includes a light shield or "dark room" and a lens/filter assembly which provides control of the depth of focus of the scanner. The optical module is located behind the light source, and the detector, made up of a CCD array is mounted behind the optic module for detecting the light intensity in the reflected beam over a field of view across a bar code symbol. The CCD array generates an electrical signal indicative of the detected light intensity. A DC source or battery provides DC voltage to the LEDs and CCDs in response to a clocked signal which provides a gradual or sequential illumination of the LEDs and coordinates the activation of the CCDs in order to minimize power consumption during scans.

REFERENCES:
patent: 4315245 (1982-02-01), Nakahara
patent: 4818886 (1989-04-01), Drucker
patent: 5258605 (1993-11-01), Metlitsky
patent: 5354977 (1994-10-01), Roustaei

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