Automatic focusing apparatus

Details Automatic focusing apparatus Automatic focusing apparatus

1978-07-14

1980-10-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, G01J 136

Patent

active

042309409

ABSTRACT:
An automatic focusing apparatus includes a lens for leading a laser beam onto a sample surface at a predetermined incident angle, a beam splitter to divide the reflected beam from the sample surface in accordance with the vertical shift thereof, a pair of photo diodes to respectively receive the divided beams and produce electric signals, a differential amplifier to produce a differential signal between the electric signals and a mechanism to vertically shift the stage by means of the differential signal to automatically focus a lens system on said sample surface.

REFERENCES:
patent: 3193686 (1965-07-01), Heinz
patent: 3562538 (1971-02-01), Mergler
patent: 3649840 (1972-03-01), Thorn et al.
patent: 3721827 (1973-03-01), Reinheimer
patent: 3798449 (1974-03-01), Reinheimer et al.
"Control Mechanism in the Philips VLP Record Player," Philips Tech. Rev. 33, 190-193 (1973), Janssen et al.

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