Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1976-06-29
1978-03-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250201, 354 25, G01J 136
Patent
active
040805310
ABSTRACT:
An adjustable camera lens forms an image of an object on an image plane. First and second mirrors produce respective first and second detection images of the object on respective first and second arrays of light sensors. These arrays form portions of an integrated circuit chip. Upon each actuation of the apparatus to provide a focusing adjustment of the lens, a single pass scanning mechanism moves one of the mirrors, independently of the lens, completely through its full range of movement in a single scanning pass, and then arrests this scanning movement of the mirror until the apparatus is subsequently actuated again to initiate a subsequent scanning and focusing operation. The scanning movement of the mirror moves the corresponding image on the corresponding array. A signal processing circuit receives the outputs of the light sensors and produces an output signal which experiences a peak at that position of the moved mirror which causes the light distributions of the images to be in best correspondence on the arrays. This mirror position is the correlation position and represents the existing object distance. A circuit which receives the output signal produces a mirror position signal which represents the mirror correlation position at which the output signal peak occurs. A comparator compares the mirror position signal with a signal representing the lens position and allows a spring to move the lens independently of the mirror until the lens position signal corresponds to the mirror position signal. At that time, the lens movement is arrested, leaving the lens in a focus position which corresponds to the mirror correlation position and to the existing object distance, and at which the image of the object is in focus on the image plane.
REFERENCES:
patent: 3450883 (1969-06-01), Thomas
patent: 3759614 (1973-09-01), Harvey
patent: 3898676 (1975-08-01), Hosoe et al.
patent: 4002899 (1977-01-01), Stauffer
Hanson H. L.
Honeywell Inc.
Nelms David C.
Sunderdick Vincent J.
Ungemach C. J.
LandOfFree
Single pass distance determining and automatic focusing apparatu does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Single pass distance determining and automatic focusing apparatu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Single pass distance determining and automatic focusing apparatu will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-571910