Abstract: A camera, adapted to function with film speed data, includes structure for introducing the film speed data and for storing that data. Manually set exposure time data is also stored. A determination is made whether the film is advanced to the first effective film frame. The film speed or exposure time data is alternately indicated and the indication is controlled to indicate the film speed data until the film is advanced to the first effective film frame subsequent to which the indication is switched to indicate the exposure time data when the film is advanced to the first effective film frame. The indication may subsequently be manually switched to indicate the film speed data. The film speed data may be read from the film cartridge upon closure of the back lid of the camera and transferred to storage.

Abstract: In a camera functioning with film speed data introduced by a manual operation for setting desired film speed data, exposure time data is set by a manual operation, and one of the film speed data and the exposure time data are alternatively indicated. The first and second indicating means are controlled, in response to first setting means such that the film speed data appears at the first indicating means when the first setting means is manually operated. The exposure time data is selected to appear at the first indicating means when the first setting means is not manually operated. The second indicating means is disabled when the first setting means is manually operated so that the film speed data appears without appearance of the additional data. The second indicating means is enabled so that the additional data appears with the exposure time data when the first setting means is not manually operated.

Abstract: A camera system operable with data carried from a camera accessory to a camera body. The camera accessory has a ROM for storing various data at a plurality of addresses, respectively, each of which data consists of a plurality of bits, and a coupling terminal for receiving a train of clock pulses from the camera body. A circuit is also provided for squentially designating the address of the ROM one by one to permit the ROM to output data stored at the designated address. In the circuit, an address signal is formed in response to the clock pulses, received through the coupling terminal, for designating an address. The data derived from the ROM are transmitted to the camera body.

Abstract: A camera system comprising a camera body and an interchangeable lens assembly adapted to be coupled to the camera body. The interchangeable lens assembly has no manipulatable aperture adjusting ring, but has an aperture mechanism and a read-only memory both built therein. The read-only memory stores therein various data peculiar to such lens assembly. The camera body communicates with and power the lens assembly through a set of terminals connectable with associated terminals provided in the lens assembly. The terminals in each of the camera body and lens assembly are arranged in a generally arcuate row with the data transmitting terminal located at one extremity of the arcuate row on the leading side with respect to the direction of turn of the lens assembly which is effected when the lens assembly is to be completely coupled to the camera body.

Abstract: A camera has an automatic data reading arrangement for reading ISO data provided on a film cartridge. When a main battery is exchanged with an old battery while the film is still loaded in the camera, ISO data is maintained in a memory supported and powered by a back-up battery. If such an ISO data is not available after the exchange of the main battery, ISO data again read from the loaded film cartridge is employed. If the film is not the type that can provide an ISO data, the most widely used ISO data will be automatically set for the further exposure calculation.

Abstract: A camera system operable with data carried from a camera accessory to a camera body. The camera accessory has a ROM for storing various data at a plurality of addresses, respectively, each of which data consists of a plurality of bits, and a coupling terminal for receiving a train of clock pulses from the camera body. A circuit is also provided for sequentially designating the address of the ROM one by one to permit the ROM to output data stored at the designated address. In the circuit, an address signal is formed in response to the clock pulses, received through the coupling terminal, for designating an address. The data derived from the ROM are transmitted to the camera body.

Abstract: A camera accessory capable of transmitting data to a camera includes a ROM for storing various data at a plurality of addresses, respectively. The data includes a group of data related to the camera accessory and other groups of data which are not related to the camera accessory, but are related to other camera accessories, such that the ROM memorizes all the data of different kinds of camera accessories, and such data are divided into a number of groups, each group related to one kind of camera accessory. The camera accessory further includes a code signal producer which produces a code signal when an accessory is mounted on the camera so as to identify the type of the camera accessory, a receiver for receiving a digital signal from the camera, and a controller responsive to the code signal and the digital signal for controlling the data transmission from the camera accessory to the camera so that only the data of one group related to the particular camera accessory are transmitted to the camera.

Abstract: A camera system having an interchangeable objective lens selectively mountable to at least two different types of camera bodies of a, first type and second type, is involved. The camera system has a ROM located in the interchangeable objective lens for storing a plurality of compensation data: one is suitable for the first type camera body; and the other is suitable for the second type camera body. Each data compensates an error in fully-open aperture light measurement for each type of camera. The compensation data is transmitted from the lens to the camera body. A register is provided in the camera body for storing a selected compensation data which is necessary for the type of camera body mounted with the lens. A device is provided in the camera body for practicing a fully-open aperture light measurement through the interchangeable objective lens to produce a light measuring information including the light measurement error.

Abstract: A camera system includes a data source provided in a camera accessory such as an interchangeable lens and a micro-computer in a camera body. A requesting data for requesting particular data related to the lens is sent from the camera body to the lens, whereby the lens produces the particular data and sends it to the camera body. By the use of the particular data from the lens and other data obtained from the camera body, the micro-computer carries out exposure calculations and controls the camera based on the calculated result.

Abstract: A camera includes a manually adjustable photographic parameter such as diaphragm aperture, shutter speed, focus distance or the like and an electrically energizable network indicating the value of the adjusted parameter or a related value. The indicator network is connected through a normally open signal controlled semiconductor switch to a current source and a device is located on the manually accessible face of the photographic parameter adjusting member and is electrically connected to the switch network input and is touch responsive to produce of switch network closing signal so as to automatically energize the indicator network upon manual engagement of the adjusting member. The sensing member is alternatively a pair of spaced conductor electrodes or a piezo-electric element and the switch is respectively responsive to resistance or voltage values applied to its input. A network is provided for opening the closed switch after a predetermined period.

Abstract: A flash photography system for a camera which is adapted to be used with an electronic flash device which supplies a control signal when the device is a ready condition. The camera includes a diaphragm control circuit which automatically control the diaphragm aperture in accordance with a measurement of the light from the scene to be photographed. The diaphragm control circuit includes a circuit for producing a first program signal for controlling the diaphragm aperture and camera exposure time in a first programmed relationship with the light measurement for daylight or natural light photography, and a circuit for produces a second program signal for controlling the diaphragm aperture in a second programmed relationship with the light measurement for flash photography. The second program signal is adapted to provide a proper exposure for the ambient light condition as well as the flash light illumination.

Abstract: A camera system is provided that permits memory data dedicated to particular camera accessories to be transmitted to the camera body for enabling the operation of the camera. The camera accessories can carry dedicated information or variable information to the camera body. Synchronization between the camera accessory and the camera body can be provided by a train of clock pulses. Information can be programmed in a fixed memory circuit to insure that only a particular accessory so designated will provide information to the camera body to prevent any erroneous inputting of data from a plurality of camera accessories that are contemplated for use with a particular camera body.

Abstract: A camera capable of AE-lock photography wherein an output of a light measuring circuit is stored in response to a manual operation at an arbitrary time prior to a shutter release operation, and exposure is controlled in accordance with the stored output. AE-lock switch is interposed between a light measuring circuit and a first storage capacitor, while a buffer circuit is interposed between the first storage capacitor and a second storage capacitor. Exposure is controlled in accordance with the charged voltage of the second storage capacitor. The above mentioned buffer circuit is connected with a switch means which supplies power for a given short period at an initial stage in conjunction with a shutter release operation whereby the second storage capacitor is charged to the voltage of the first storage capacitor during that given period.

Abstract: An automatic diaphragm control camera of the T. T. L light measurement type sets a diaphragm to a fully opened aperture in the case of daylight photographing with a low brightness condition by generating a diaphragm stopping-down prevention signal which serves to deactivate an electromagnetic diaphragm stopping-down release device. Upon receipt of a flash readiness signal from an electronic flash device, however, the camera, in preference to the generation of the diaphragm stopping-down prevention signal, activates the electromagnetic diaphragm stopping-down release device in response to a camera release operation.

Abstract: An analog-to-digital converter for cameras generates a digital output signal representing the difference between a pair of analog input signals by converting a generated variable digital signal into a variable analog signal, combining a first analog input signal with the variable analog signal to provide a calculated analog signal and comparing the calculated analog signal with a second analog input signal to determine whether or not such signals have a predetermined relationship with respect to one another such that the variable digital signal is fixed when the aforementioned predetermined relationship is determined to exist.

Abstract: A controlling device that determines the diaphragm aperture of the camera in accordance with an output of a light measuring circuit, which detects a light from an object to be photographed being illuminated by a light which includes an alternatingly changing component and has its intensity maintained constant in effect for a given time period. The device is equipped with a smoothing circuit for smoothing the ripple component in the photoelectric output. The smoothing circuit is set to have a charge time constant smaller than the discharge time constant and generates an output equivalent to the peak value of the ripple component. The light that illuminates the photographic object can be generated from the electronic flash and the photoelectric detector may be arranged within the body of a camera to receive the light from the photographic object that passes through the diaphragm aperture of the camera.

Abstract: An electromechanical device such as a camera diaphragm control device includes a compensation means which compensates for a time lag from generation of a stop signal to actual stoppage of a movable member such as a diaphragm or a diaphragm drive member. The amount of compensation is varied in accordance with determination of the amount of the movement of the movable member from an initial end position to a position where the movable member is to be stopped. In the case of automatic diaphragm control, the amount to be determined may be the steps from the full open position to a position corresponding to a diaphragm aperture to be determined.

Abstract: An audible indication system indicates, by sound, information relating to camera operation and/or exposure condition such as information that a self-timer is in operation, that the camera is operated by a remote control signal, that the brightness of an object to be photographed is in a blur-occurring range or so high as to require non-available shutter speed, or that an electronic flash is ready for firing. A control means is provided for controlling the volume of the sound in accordance with the information to be indicated such that the information to be recognized remotely from the indicator, such as the information of self-timer operation and remotely controlled camera operation, is indicated with sound of a loud volume, while the information to be recognized in the proximity of the indicator, such as warning of out-of-range object brightness and the ready condition of an electronic flash device, is indicated with sound of relatively low volume.

Abstract: A flash photography system adapted for the combination of an electronic flash device and a photographic camera with an electrically controlled shutter which, as in the case of two-curtain type focal plane shutters, effects film exposure with a slit scanning or sweeping over the film surface. To enable full film exposure of a scene being illuminated by the flash light, the electronic flash tube is controlled to emit light at a constant light intensity for a period sufficient enough to cover the time during which the shutter slit completes its travel. The flash light emission is initiated in synchronization with the actuation of the shutter, i.e., the commencement of the scanning or sweeping of the shutter slit. The flash light may be emitted prior to the shutter operation for the determination of camera diaphragm aperture.

Abstract: An automatic electronic flash device capable of producing both a preliminary flash light used for automatic determination of a diaphragm aperture of a camera and a primary flash light used for actual photographing has signal contacts which are less in number than the signals to be transmitted from the camera to the flash device for the control of the production of the preliminary and primary flash lights. Thus, a common signal contact is used for transmission of both a preliminary flash control signal and a primary flash stop signal. The flash device is provided with a control circuit which properly delivers the two signals to a preliminary flash control circuit section and a primary flash termination circuit section of the flash device in dependence upon whether or not a synchronizing signal for initiating the production of the primary flash light appears at the synchronizing contacts.