Automatic focusing apparatus

Details Automatic focusing apparatus Automatic focusing apparatus

1975-12-15

1977-08-30

Adams, Russell E.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, G03B 708

Patent

active

040458059

ABSTRACT:
An apparatus for detecting the correctly focused image of the object projected on a focal plane, comprising a suitable optical system for forming the image of an object to be photographed on the focal plane, and a circuit which receives an electric signal transduced from the image light and controls a motor for displacing an objective lens assembly associated with the apparatus. Provision is made for eliminating detection of false signals which may erroneously control the motor, by employing a peak value holding circuit in the circuit means.

REFERENCES:
patent: 3450018 (1969-06-01), John, Jr.
patent: 3896457 (1975-07-01), Yamanishi et al.
patent: 3941996 (1976-03-01), Stauffer
"The Automatic Focusing of Optical Systems," The British Journal of Photography, July 4, 1975, pp. 594-596.

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