Method and system for reading encoded optical signals and formin

Details Method and system for reading encoded optical signals and formin Method and system for reading encoded optical signals and formin

1996-10-25

1998-12-29

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023114, G01D 534

Patent

active

058544836

ABSTRACT:
A method of reading encoded optical signal including the steps of: i) driving a light source to produce a light beam, ii) using a lens to focus the light beam of the light source onto a receiving face of a crystal of a phototransistor by a lens, and iii) chopping off the energy of the light from the light beam which surpasses the rated working voltage of the phototransistor, and disregarding from judgment the potential of the light beam which is below a predetermined critical level, so as to obtain a signal approximately equal to a square wave.

REFERENCES:
patent: 4507647 (1985-03-01), Minami et al.
patent: 5254919 (1993-10-01), Bridges et al.

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