Converging position detecting apparatus with a single photodetec

Details Converging position detecting apparatus with a single photodetec Converging position detecting apparatus with a single photodetec

1994-03-31

1996-01-09

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502014, 358481, 359216, H01J 4014

Patent

active

054830540

ABSTRACT:
A single photodetecting element, in front of which a knife edge is placed, is disposed in front of a scanning surface and outside a laser beam scanning region for the scanning surface. Two mirrors or a single half mirror is disposed outside the scanning region on the side opposite to the side where the photodetecting means is disposed, and directs the light beam to the photodetecting element along two optical paths. The photodetecting element and the two mirrors or single half mirror is so disposed that lengths of the two optical paths are equal to respective lengths of two imaginary optical paths to predetermined positions spaced from the scanning surface perpendicularly in opposite directions.

REFERENCES:
patent: 4720632 (1988-01-01), Kaneko
patent: 5331147 (1994-07-01), Mizuno et al.

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