Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1983-09-29
1985-02-19
Perkey, William B.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
250204, G03B 708, G01J 120
Patent
active
045001898
ABSTRACT:
An apparatus for detecting a focus condition of an imaging lens of a still camera by detecting a lateral shift of two images formed on a light receiving element array by means of light fluxes transmitted through different sections of the exit pupil of the imaging lens divided by a stripe mask is disclosed. The variation of outputs from light receiving elements of the array due to an image height is corrected electrically by means of a correction circuit including first and second triangular wave generating circuits for generating first and second triangular waves having negative and positive inclinations, a clock pulse generator for producing clock pulses, a signal selection circuit for selecting alternately the first and second triangular waves in synchronism with the clock pulses to produce a correction signal, and a multiplying circuit for multiplying the outputs from the light receiving elements with the correction signal to provide a corrected signal from which the lateral shift can be detected accurately.
REFERENCES:
patent: 4373791 (1983-02-01), Araki
Olympus Optical Co,. Ltd.
Perkey William B.
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