Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1979-09-18
1981-06-30
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250204, G01V 120
Patent
active
042764718
ABSTRACT:
A focus detecting device comprises an image forming optical system, a light beam scanning device for scanning the light beam from the image forming optical system in a predetermined direction and for generating an electrical output corresponding to the scanning direction of the light beam, an image re-forming optical system for re-forming the image formed by the image forming optical system, an image position detecting device for photoelectrically detecting the direction of movement of the image formed by the image re-forming lens, and a discriminating circuit for discriminating between the focusing, the front focus and the backward focus from the direction of movement of the image by the image re-forming optical system with respect to the direction of scanning of the light beam by the scanning optical system on the basis of the outputs of the light beam scanning device and the image position detecting device.
REFERENCES:
patent: 3849643 (1974-11-01), Takeda
patent: 4047022 (1977-09-01), Holle
patent: 4191882 (1980-03-01), Sato
Nelms David C.
Nippon Kogaku K.K.
LandOfFree
Focus detecting device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Focus detecting device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus detecting device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2434488