Camera exposure calculating device
AssigneeMinolta Camera Kabushiki Kaisha
InventorsManabu Inoue, Akihiko Fujino, Masaaki Nakai
Life of this patent
Estimating the term…
Abstract
An exposure calculating device, for use in a camera having a programmed exposure control mode which automatically calculates a shutter speed and a diaphragm aperture value in a programmed manner, is further capable of modifying the combination of calculated shutter speed and aperture value in accordance with the manual operation. The amount of modification value is automatically reset in response to the detection of the operational condition of the camera, such as a detachment of an exchangeable lens, the charging completion of an electronic flash device, the camera exposure control by a camera accessory, and the change of the exposure control mode.
Claims9
An exposure calculating device for use in a camera which device automatically calculates a shutter speed and a diaphragm aperture value in accordance with a predetermined exposure program and further calculates a light measuring value, said device comprising:
- manually operable means for generating a signal in response to the manual operation thereof;
- setting means for setting a modification value in accordance with the signals from said operable means;
- calculating means for modifying the calculated shutter speed and aperture value by the modification value;
- reset means for reseting the modification value to zero;
- and
- means for automatically determining the appropriateness of the resetting of said reset means in accordance with the operational condition of said camera and generating a reset signal when the appropriateness of the resetting is determined.
Dependencies are inferred from the claim text.