초록 ▼

A light measuring device, for use in a camera having an objective lens, for measuring a brightness of a spot of an object, uses an autofocus detecting system which includes an array of light receiving elements for producing charges at a rate relative to an intensity of the light impinging thereon fr

A light measuring device, for use in a camera having an objective lens, for measuring a brightness of a spot of an object, uses an autofocus detecting system which includes an array of light receiving elements for producing charges at a rate relative to an intensity of the light impinging thereon from the object, and a light receiver provided adjacent the light receiving element array for producing a photocurrent at an amount relative to an intensity of the light impinging thereon from said object. The charges produced from the light receiving elements are integrated in a plurality of charge accumulation portions, respectively, and the charges produced by the light receiver is integrated in a capacitor. A comparator is provided for comparing the integrated charges with a predetermined level, and for producing a stop integration signal when the integrated charges reaches the predetermined level so as to stop the integration in the first integration means. A spot brightness detector is provided for detecting the brightness of the sopt of the object using the integrated charges from the capacitor.

대표청구항 ▼

A light measuring device, for use in a camera having an objective lens, for measuring a brightness of a spot of an object, comprising: first light receiving means having a plurality of light receiving elements for producing charges at a rate related to an intensity of the light impinging thereon fro

A light measuring device, for use in a camera having an objective lens, for measuring a brightness of a spot of an object, comprising: first light receiving means having a plurality of light receiving elements for producing charges at a rate related to an intensity of the light impinging thereon from said object; first integration means having a plurality of charge accumulation portions for integrating charge produced by corresponding light receiving elements; second light receiving means provided adjacent said first light receiving means for producing a photocurrent at an amount relative to an intensity of the light impinging thereof from said object; second integrating means for integrating charge produced by said second light receiving means; comparing means for comparing said second integrated charge with a predetermined level, and for producing a stop integration signal when said integrated charge reaches said predetermined level, said stop integration signal being used for stopping the integration in said first integration means; focus detection means for detecting the focus condition of said objective lens using the integrated charge data from said first integration means; spot brightness detecting means for detecting the spot brightness of said spot of said object using the photocurrent from said second light receiving means; and exposure data calculating means for calculating exposure data based on the spot brightness.