Bar code reader using holograms

Details Bar code reader using holograms Bar code reader using holograms

1990-08-06

1992-10-06

Shepperd, John W.

Registers

Coded record sensors

Particular sensor structure

235467, G06K 710

Patent

active

051534177

ABSTRACT:
A bar code reader includes a hologram receiving a scanning light beam in sequence from a scanning light beam source for directing the scanning light beam to a bar code to be read along one path so that the bar code is scanned with the scanning laser beam in two-dimensional directions, and for guiding the scanning light beam to a photo-detector along the same path after the scanning light beam is reflected from the bar code, a condenser lens disposed in an optical system between the photo-detector and the hologram for collecting the reflected scanning light beam into the photo-detector, and a light blocking member disposed in an optical system between the condenser lens and the hologram for blocking unwanted light from the photo-detector, which unwanted light advances toward an incident side of the hologram on which the scanning light beam is directed.

REFERENCES:
patent: 4224509 (1980-09-01), Cheng
patent: 4235504 (1980-11-01), Ikeda et al.
patent: 4415224 (1983-11-01), Dickson
patent: 4540247 (1985-09-01), Nishi et al.
patent: 4647143 (1987-03-01), Yamazaki et al.
patent: 4678288 (1987-07-01), Lonsdale et al.
patent: 4794237 (1988-12-01), Ferrante
patent: 4999482 (1991-03-01), Yang

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