专利汇可以提供Exposure control system of camera using physical aperture专利检索,专利查询,专利分析的服务。并且PURPOSE: To obtain adequate exposure by holding the quantity of light to an image surface constant, by varying the stop-down extent of an aperture during shutter's operation according to fluctuations of object luminance.
CONSTITUTION: If object luminance increases suddenly during the operation of a shutter, the output of photometric arithmetic circuit 12 rises. When it exceeds level VS
1 , the outputs of amplifiers 15 and 16 are held at H and L respectively, and the output of gate 20 is inverted to level H, generating a high-speed pulse string by gate 21. This pulse string is inputted to up-down counter 23 to increase the output voltage of D/A converters 24, and the collector voltage of transistor 64 drops to increase the voltage applied to transparent ceramic element 63; and the quantity of light transmission of element 63 is decreased to increase the stop-down extent of the physical aperture, thereby holding constant the quantity of light incident to a film surface.
COPYRIGHT: (C)1981,JPO&Japio,下面是Exposure control system of camera using physical aperture专利的具体信息内容。
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