Optical scanner using planar reflection holograms

Details Optical scanner using planar reflection holograms Optical scanner using planar reflection holograms

1992-11-18

1993-09-14

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

235467, 235457, 359 17, G06K 710

Patent

active

052451704

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 strips of planar reflective holograms disposed substantially in parallel with each other in one plane to produce a reflection beam having an angle of reflection which is different from an angle of incidence of the laser beam thereon. Another embodiment discloses a condenser integrated with one of plane mirrors for deflecting the scan beam to form a hologram module of the reflection type. The scanner is a miniaturized apparatus as a result of the reflection holograms.

REFERENCES:
patent: 4073566 (1978-02-01), Noguchi
patent: 4094576 (1978-06-01), Heiling
patent: 4385831 (1983-05-01), Ruell
patent: 4652732 (1987-03-01), Nickl
patent: 4955694 (1990-09-01), Kaser

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