AUTOMATIC FOCUSING CAMERA,申请号JP19800140751-传众专利搜索

AUTOMATIC FOCUSING CAMERA

申请公布号：JPS5764217(A)

申请号：JP19800140751

申请日期：1980.10.07

申请公布日期：1982.04.19

申请人：

CANON KK

发明人：FUJIKI MAKOTO;TSUJI SADAHIKO

分类号：G03B13/36;G02B7/30;G02B7/32

主分类号：G03B13/36

摘要：PURPOSE:To prevent a shift between a distance measuring view field mark and an actual distance measuring range, by separating a finder optical system and a distance measuring optical system from the same optical path. CONSTITUTION:A finder optical axis 51 is matched with an object to be photographed, by a distance measuring view field mark 66 in the finder, a light source 55 is emitted of light, and when the object to be photographed is scanned by infrared rays, and reflected rays are reflected by a dichromic mirror 57, and are made incident to a photodetecting element 56 through a lens 54 and mirror 63. Also, a distance of the object to be photographed is detected from a turning angle theta and a base line distance D of a light source 55 in case when the incident light quantity has become maximum, and the automatic focus control is executed by moving a lens barrel 43 in the optical axis direction in accordance with a distance of the object to be photographed. In this way, the distance measuring view field mark in the finder, and an actual distance measuring range are not varied by a distance of the object to be photographed.