초록 ▼

In a single-lens reflex camera having an objective lens, a focusing screen and a view finder, a photodetector array is arranged to receive a central part of an object image formed by the objective lens and a focusing condition of the objective lens is detected by calculating an evaluation function f

In a single-lens reflex camera having an objective lens, a focusing screen and a view finder, a photodetector array is arranged to receive a central part of an object image formed by the objective lens and a focusing condition of the objective lens is detected by calculating an evaluation function from image signals supplied from the photodetectors. A presetting dial for selecting given photodetectors whose image signals are used for detecting the focusing condition is provided at such a position that a part of the dial is exposed to the outside through an opening formed in a rear wall of a camera body at a position underneath a film winding lever. A light emitting diode array is provided on the focusing screen so as to be seen by a user through the view finder. Only desired light emitting diodes are lighted on under the control of a signal supplied by the dial to indicate the region of the photodetector array which is used for detecting the focusing condition.

대표청구항 ▼

In an apparatus for detecting a focusing condition of an objective lens of an optical device comprising a focusing screen arranged at a position optically conjugated with a predetermined focal plane, a viewfinder for inspecting an image of an object formed on said focusing screen, a photodetector ar

In an apparatus for detecting a focusing condition of an objective lens of an optical device comprising a focusing screen arranged at a position optically conjugated with a predetermined focal plane, a viewfinder for inspecting an image of an object formed on said focusing screen, a photodetector array having a number of photodetectors arranged closely side by side on or near a plane which is optically conjugated with the predetermined focal plane, means for projecting a part of the object image upon said photodetector array, and means for receiving image signals supplied from said photodetectors and for processing the image signals in accordance with a given evaluation function to detect the focusing condition of the objective lens, the improvement comprising: means for selecting an active region portion of said photodetector array for use in detecting the focusing condition, to enable the active region portion to be selectively changed in size and position within the photodetector array to change the size and position of that part of the object image which is used to control focusing.