Focusing-point detector

Abstract

Abstract PURPOSE: To detect a focusing point securely with simple constitution by equipping a projecting means, which varies in projection direction according to focus adjusting operation, in a photographic lens body. CONSTITUTION: The lighting of a light emitting element 8 incorporated in an interchangeable photographic lens 1 is controlled by the driving circuit of a camera body 2 side. Then, the focus ring 4 of the lens 1 is rotated to settle a distance, thereby controlling the projection direction of the element 8 to a projection direction crossing a point on an optical axis where a lens group 6 is in focus. Reflected light from an object is photodetected by a photodetecting element 20 to place a focusing detection circuit 22 in a cynchronous state, so that the focusing of a single-lens reflex camera, etc., having an interchangeable lens is detected securely with simple constitution. COPYRIGHT: (C)1982,JPO&Japio

Inventors

• 👤 Tsunemi Yoshino
• 👤 Toshiji Kashiwara
• 👤 Hiroshi Iwata
• 👤 Akitoshi Morioka

Bibliographic Details