Laser beam reader having a projecting and receiving optical syst

Details Laser beam reader having a projecting and receiving optical syst Laser beam reader having a projecting and receiving optical syst

1988-11-03

1990-11-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250566, H01J 314

Patent

active

049688766

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 intersected with each other within 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: 1014, 07071987
patent: 1016, 07211987
patent: 4365323 (1982-12-01), Heemskerk et al.
patent: 4488042 (1984-12-01), Clay et al.
patent: 4539482 (1985-09-01), Nose
patent: 4806774 (1989-02-01), Lin et al.

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