Exposure value control circuit
专利汇可以提供Exposure value control circuit专利检索，专利查询，专利分析的服务。并且PURPOSE: To perform exposure value control excelling in controllability and without causing misoperation, by forming specified aperture information signal in dimmer type flash device, and using this signal for controlling and adjusting the aperture.
CONSTITUTION: When a flash device 1 is fitted to a shoe 6 of a camera main body 3, the end part 7-1 of a lever 7 is displaced by a protruding part 2 of a mounting base of which length is determined according to the specified aperutre, and S
2 -1 of a switch S
2 is changed over ot S
2 -2 side, and a resistor R
1 of which value is determined by a sliding brush 7-2 of the lever 7 is connected instead of a photo detector P. Therefore, if the specified aperture of the attached flash device 1 is, for instance, F4 at ASA100, the value of R
1 corresponds thereto, and a corresponding current flows in a meter M, then the pointer automatically inidcates F4. In such a constitution, when the flash device is fitted, the operation is automatically changed to flash photographing and the specified aperture to be set will be automatically set depending on the characteristics of the flash device and the sensitivity of the film, so that there is no risk of misoperation.
COPYRIGHT: (C)1980,JPO&Japio，下面是Exposure value control circuit专利的具体信息内容。
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