Optical system of laser beam reader

Details Optical system of laser beam reader Optical system of laser beam reader

1990-02-02

1991-09-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235472, H01J 314

Patent

active

050476254

ABSTRACT:
An optical system of a laser reader has a light projecting portion for emitting a laser beam of light converging toward an object, a condenser lens for condensing a reflecting light from the object and a light receiving element for detecting light quantity of the reflecting light condensed by the condenser lens. The optical axis of the light projecting portion and that of the condenser lens are substantially parallel within a readable range which is established by a relation between a spatial frequency of the object and a spot diameter of the laser beam of light.

REFERENCES:
patent: 4365323 (1982-12-01), Heemskerk et al.
patent: 4488042 (1984-12-01), Clay et al.
patent: 4539482 (1985-09-01), Nose
patent: 4678288 (1987-07-01), Lonsdale et al.
patent: 4682016 (1987-07-01), Inoue
patent: 4806774 (1989-02-01), Lin et al.

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