Optical reader

Details Optical reader Optical reader

1994-01-05

1996-04-02

Hajec, Donald

Registers

Coded record sensors

Particular sensor structure

362 32, G06K 710

Patent

active

055043178

ABSTRACT:
In an optical reader a lens system is located between a source of light designed to illuminate an object to be read and the object. The lens system is designed to refract and diffuse the light produced by the light source to reduce the deleterious effect of specular light reflected from the illuminated object into the optical reader and an image sensor designed to convert reflected photo signals into electric analog signals. In one embodiment of the invention the optical reader includes an array of LEDs and a lens having prisms located in front of each LED for refracting or bending the light output of each LED to reduce the generation of specular light being reflected. In another embodiment the optical reader includes a lens with a light shield strip to prevent the generation of specular light.

REFERENCES:
patent: 4516017 (1985-05-01), Hara et al.
patent: 4734566 (1988-03-01), Senda et al.
patent: 4743773 (1988-05-01), Katana et al.
patent: 4818847 (1989-04-01), Hara et al.
patent: 4935609 (1990-06-01), Wike, Jr.
patent: 4983817 (1991-01-01), Dolash et al.
patent: 5028770 (1991-07-01), Miyazaki et al.
patent: 5280161 (1994-01-01), Niwa

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