Abstract: A flash photographic exposure control system for a camera having an electrically timed shutter is provided with an additional electronic or mechanical timing device in combination with an electronic changeover switch responsive to attainment of the threshold level of the flash unit associated therewith. This is done to switch the camera from an automatic daylight exposure range to an automatic flash exposure range in which a particular timed interval suited for flash photography is made by the timing device which is brought into cooperation with the shutter operating means when the changeover switch is actuated, while the intrinsic timing device for the shutter being cut off from the control means for the shutter.

Abstract: An exposure control system for a camera of the type provided with shutter preselection and diaphragm preselection automatic exposure ranges and with a manual exposure range. A switching arrangement responds to a selected range by selectively establishing one of three possible combinations of channels. These transmit photographic analog information from exposure control parameter setting means, which include means for preselection of a desired shutter time and/or diaphragm aperture to exposure determining means which have shutter and diaphragm control means, either directly or through a computer circuit. This switching arrangement is rendered less susceptible to and adapted for incorporation in a semiconductor device with integrated circuits normalized for various types of cameras including the type having an individual single exposure range and is amenable to relatively low cost unit production techniques.

Abstract: A photographic flash exposure control system for a camera associated with a flash device. In conformance with a preselected shutter interval, an effective exposure aperture of a diaphragm device is computed by a computing circuit of the system. The total flash energy available from the flash device is automatically controlled in accordance with the luminance of the subject being photographed, to thereby provide correct exposure for complex lighting situations.

Abstract: An exposure control apparatus which can set accurate shutter speed constantly irrespective of changes in ambient temperature and which can eliminate not only an error in shutter speed caused by an expansion semiconductor element but also an error in shutter speed caused by the variation in output characteristics due to variation in temperature of a compression circuit.

Abstract: A single lens reflex camera adjusted to a shutter preference exposure range in which responsive to the light sensor and preselected shutter speed, an Appex type computer derives an exposure value which is previously stored, and thereafter automatic adjustment of the diaphragm mechanism in accordance with the stored exposure value starts in substantial coincidence with the start of pivoting movement of the mirror from its viewing to non-viewing position which is followed by the operation of the shutter mechanism to thereby minimize the time interval between the time when the shutter button is depressed and the time at which the shutter is released from its cocked position.

Abstract: An automatic flash device comprising:A power source,A main capacitor to be charged to a certain level by said power source,A discharge circuit being connected to said main capacitor,A control circuit to make the amount of electricity discharged by said discharge circuit correspond to flash photographing information,A means to start discharging, which is actuated after a shutter release means of a camera is actuated to start the discharging of said main capacitor, andA means to cause a flash tube to emit light when the amount of electricity charged at the main capacitor reaches such a value as corresponds to flash photographing information.