Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1978-12-22
1981-04-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354 25, G01S 136
Patent
active
042648106
ABSTRACT:
Focus detecting apparatus for an optical system including first and second image forming optical means for forming the image of an object along first and second spatially separated light paths, first and second photosensitive element arrays each comprising a plurality of photosensitive elements and producing an electrical signal representative of the intensity distribution pattern of the light incident thereon, and circuit means for detecting the focus of the optical system in accordance with the electrical signals from the first and second arrays. The circuit means includes a first processing circuit, a second processing circuit and a phase comparing circuit. The first processing circuit produces an electrical output having a phase representative of the positional relation between the first array and the intensity distribution pattern of the light incident on the first array, in accordance with the electrical signal from the first array. The second processing circuit produces an electrical signal having a phase representative of the positional relation between the second array and the intensity distribution pattern of the light incident on the second array, in accordance with the electrical signal from the second array, and the phase comparing circuit compares the phases of the electrical outputs from the first and second processing circuits and produces an output signal representative of the focus position of the optical system.
REFERENCES:
patent: 3838275 (1974-09-01), Stauffer
Shirasu Hiroshi
Utagawa Ken
Hostetter Darwin R.
Nelms David C.
Nippon Kogaku K. K.
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