Focus detector for optical apparatus

Details Focus detector for optical apparatus Focus detector for optical apparatus

1985-08-05

1987-06-09

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250237R, 369 45, G11B 700

Patent

active

046721886

ABSTRACT:
An optical disk recorder focus-error system includes a so-called "knife-edge" focus detector. The dynamic range of the detector is enlarged by placing an apertured mask intermediate the knife edge and the source of the light beam being focused. The knife-edge mask and the apertured mask can be deposited opaque films on a lens.

REFERENCES:
patent: 4441175 (1984-04-01), Shuman
patent: 4517666 (1985-05-01), Ando

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