Optical scanner using plannar reflecting holograms

Details Optical scanner using plannar reflecting holograms Optical scanner using plannar reflecting holograms

1992-05-29

1993-07-27

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

235457, 235467, 359 15, 359 17, G06K 710, G02B 532

Patent

active

052312771

ABSTRACT:
An optical scanner suitable for use with a bar code reader includes a light source for generating a laser beam, a laser beam scanning device, a scanning pattern generating optical system, and a signal light condensing optical system for deflecting scattered signal light scattered by an object to be read to introduce the light to a photo-detector. The scanning pattern generating optical system or signal light condensing optical system includes two reflective holograms disposed substantially in parallel with each other to produce a reflection beam having an angle of reflection which is different from an angle of incidence of the laser beam thereon. The scanner is a miniaturized apparatus as a result of the reflection holograms.

REFERENCES:
patent: 4094576 (1978-06-01), Heiling
patent: 4766298 (1988-08-01), Meyers
patent: 4799164 (1989-01-01), Hellekson et al.
patent: 4848862 (1989-07-01), Yamazaki et al.
patent: 4861973 (1989-08-01), Hellekson et al.
patent: 4955694 (1990-09-01), Kaser
patent: 4999482 (1991-03-01), Yang

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