Apparatus for detecting focusing state of objective lens

Details Apparatus for detecting focusing state of objective lens Apparatus for detecting focusing state of objective lens

1986-12-02

1988-12-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354408, G03B 300

Patent

active

047926686

ABSTRACT:
An apparatus for detecting a focusing state of an objective lens comprises optical means for forming light intensity distributions of object images whose relative positional relationship changes with the focusing state of the objective lens, sensing means having a plurality of sensors for sensing the light intensity distributions to produce first and second signals relating to the light intensity distributions, signal processing means for relatively displacing the first and second signals by determining correlation information and producing a signal for adjusting the focusing state of the objective lens in accordance with the correlation information, and altering means for altering a displacement range within which the first and second signals are relatively displaced.

REFERENCES:
patent: 4387975 (1983-06-01), Araki
patent: 4559446 (1985-12-01), Suzuki
patent: 4573784 (1986-03-01), Suzuki
patent: 4618236 (1986-10-01), Akashi et al.

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