US 3,937,950 AGranted

Focus defecting system

AssigneeCanon Kabushiki Kaisha

InventorsKazuya Hosoe, Seiichi Matsumoto, Hideo Yokota, Hiroshi Aizawa

Life of this patent

Estimating the term…

Loading patent…

Abstract

A system for detecting the distinction of the object image characterized in that respectively on a photoelectric transducing element presenting electrodes on both extremities along the longer sides of a photoelectric semiconductor presenting considerably short sides as compared with the long sides and on a photoelectric transducing element presenting electrodes on both extremities along the shorter sides of a photoelectric semiconductor presenting considerably short sides as compared with the long sides an object image is formed by means of an optics and that the distinction of the above mentioned object image is detected by detecting the electric characteristics variable corresponding to the distinction of the above mentioned object image, of each of the above mentioned photoelectric transducing elements.

Claims16

Dependent claims

A detecting device for detecting the image sharpness of an object, comprising;

A. a movable image forming optical system;
B. a photoelectric transducing means positioned behind the optical system to receive an image formed by the optical system, and having;
a. a first elongated photoelectric transducing element having a semiconductor and electrodes deposited on both long sides of the semiconductor;
b. a second elongated photoelectric transducing element having a semiconductor and electrodes deposited on both short sides of the semiconductor;
C electrical circuit means coupled to the elements for generating an electrical signal in response to the intensity distribution of the light on the phototransducing means, said first transducing means and second transducing means being connected to the circuit means to produce the electrical signal combining the output of the first transducing means with the output of the second transducing means,
D. signal responding means coupled to said electrical circuit means in the path of light from the imaging forming optical system for detecting the image sharpness,
E. said first transducing means and second transducing means being positioned in the path of light from the image forming optical system to receive light from the object.

4 more elements

A focusing device for focusing the image of an object in a focal plane comprising;

A. optical means for forming the image on the focal plane,
B. adjusting means for varying the distance between the optical means and the focal plane,
C. photoelectric means arranged for receiving at least one portion of the object light image, the photoelectric means comprising:
a. a first photoelectric transducing element having a first elongated semiconductor with two long sides, and electrodes deposited on both long sides of the semiconductor,
b. a second photoelectric transducing element having a second elongated semiconductor with two long sides and two short sides and electrodes deposited on both short sides of the semiconductor,
D. electrical circuit means coupled to the elements for generating an electrical signal in response to the intensity distribution of the light falling on the phototransducing means, said first transducing element and second transducing element being connected to the circuit means to produce the electrical signal combining the output of the first transducing element with the output of the second transducing element,
E. means coupled to said electrical means and responsive to the electrical signal generated for driving and adjusting means so as to cause the light ray from the object to be focused into a sharp image on the photoelectric means.

4 more elements

Dependencies are inferred from the claim text.