Focus detection method involving cutting more than half of light

Details Focus detection method involving cutting more than half of light Focus detection method involving cutting more than half of light

1986-06-30

1987-08-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120

Patent

active

046847995

ABSTRACT:
A knife edge type focus detection method for optics associated with an optical pickup is disclosed. A light intercepting member is interposed between an object lens and a light receiving element for focus detection in order to cut 60-95% of a reflected flux for focus detection before the flux reaches the light receiving element. The intercepted part of the flux includes a light ray which propagates through the optical axis of the optics.

REFERENCES:
patent: 3969576 (1976-07-01), Boonstra et al.
patent: 4349901 (1982-09-01), Howe
patent: 4441175 (1984-04-01), Shuman
patent: 4445209 (1984-04-01), Mickelson et al.
patent: 4450547 (1984-05-01), Nakamura et al.

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