Focus error detecting apparatus

Details Focus error detecting apparatus Focus error detecting apparatus

1988-03-11

1989-07-11

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120

Patent

active

048474800

ABSTRACT:
A focus error detecting apparatus is improved by splitting the light detector into three portions, with a first portion located between second and third portions and being elongated. The elongation prevents an out-of-focus condition where the detection light spot is elliptically elongated in the elongation direction from being falsely detected as the focused condition.

REFERENCES:
patent: 4242579 (1980-12-01), Bouwhuis

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