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AssigneeMinolta Camera Kabushiki Kaisha
InventorsToshio Kobori, Kayoshi Tsujimoto, Yasuhiro Nanba, Seiji Yamada
Estimating the term…
An exposure control device for a photographic camera uses a conventional exchangeable lens and achieves a highly accurate exposure control commensurate with a pre-selected shutter speed by a light measuring device measuring scene light transmitted through the objective lens, diaphragm, and exchangeable lens. The device also permits exposure control commensurate with a pre-adjusted diaphragm aperture by storing the output from the light measuring device determined with the adjusted diaphragm aperture to control the shutter speed. However, when the device controls the exposure with a pre-selected shutter speed, the output from the light measuring device produced with a fully open diaphragm aperture is compared with the output produced commensurate with the pre-selected shutter speed to thereby control the diaphragm aperture in shifting from its open position to its closed position, and then stores the output from the light measuring device with the adjusted diaphragm aperture to thereby control the shutter speed.
An exposure control device for a photographic camera having an objective lens and a diaphragm, comprising:
An exposure control device as in clam 1 further comprising means for manually setting the exposure time and means for producing a third electrical signal representative of the manually set exposure time, means for selecting one of said second electrical signal or said third electrical signal, and wherein said determining means includes means responsive to the selection of said third electrical signal for determining said operative position in accordance with the difference between said first and third electrical signals appearing with said diaphragm controlling means at said initial position.
Dependencies are inferred from the claim text.