| 摘要 |
PURPOSE:To restrict the minimum shutter speed in accordance with the technique of an Operator so as to effect the proper exposure without blur by providing a blur detecting mechanism having its output compensated in accordance with the information of the focal length of the lens mounted. CONSTITUTION:A blur detecting light emitting source 14 and a blur detecting photelectric converting element 19 are fixed to the body of a camera, and a blur detecting mirror 17 is always directed toward the center of gravity of the earth. When an Operator has such as insufficient technique as to effect a high blur, the optical flux reflected upon the mirror 17 is abruptly moved on the element 19. As a result, high frequency signals are generated through a grating filter 18 by the element 19. Since the frequency corresponds to the blur of the camera, the number of pulses for a preset time is counted and converted in a D/A manner. The pulses thus converted are further converted into a voltage which is fed an exposure control circuit to restrict the lowest speed of the shutter time second so that a photograph having no blue can be obtained. |
