Abstract: There is disclosed a camera equipped with a mode setting device which counts the number of uses of each of plural modes, and sets the most frequently used mode as the initial mode. At the phototaking operation, the camera is set at such most frequently used mode. The above-mentioned plural modes can be plural exposure control modes, focal length control modes, photographing magnification setting modes, self-timer modes, automatic exposure value correcting modes, or alarm modes.

Abstract: A camera uses a film cartridge containing photographic film having a magnetic medium for the recording of data by a magnetic head of the camera. To clean the head a cartridge containing a cleaning film is loaded in the camera. The camera detects the loading of this cartridge, inhibits the operation of an exposure mechanism, and winds and rewinds the cleaning film. The number of cleaning operations may be stored in a memory of the camera, and the cleaning film may have a magnetic medium on which the number of cleaning operations by the cleaning film is recorded by the magnetic head and from which the number of recorded cleaning operations is read by the magnetic head.

Abstract: A film feeding apparatus in a camera comprises a feeding device for feeding film from a film cartridge, a take-up spool device for taking up the film fed by the feeding device, and a judgment device for judging on the basis of a variation in the movement speed of the film whether the film has been taken up by the take-up spool. The movement speed of the film is determined by the feeding device before the film extending from the film cartridge is taken up by the take-up spool device, and the movement speed of the film is determined by the take-up spool device after the film has been taken up by the take-up spool device. The movement speed of the film driven by the feeding device differs from the movement speed of the film driven by the take-up spool device.

Abstract: A camera capable of recording information and using a film having a magnetic recording medium, a film and a cartridge which accommodates the film, the camera comprising: a recording device for recording information about photography to the magnetic recording medium; a reproducing device for reproducing the information recorded in the magnetic recording medium; a determination device for subjecting the information recorded by the recording device and the predetermined information reproduced by the reproducing device to a comparison so as to output an alarm signal in a case where the two information items are substantially different from each other; and an alarm device for issuing an alarm to a user in response to the alarm signal transmitted from the determination device, wherein the recording device records the predetermined information in the magnetic recording medium while the reproduction device reproduces the predetermined information recorded in the magnetic recording medium.

Abstract: A camera comprises a penta-roof prism, a plurality of inclined sensors respectively disposed at positions opposed to corresponding inclined planes of the prism, and an attitude detector for detecting the attitude of the camera in response to outputs of the sensors. Each sensor is capable of producing either of two outputs, and the outputs of the sensors are combined to produce a number of pieces of attitude information. This information is classified to provide a smaller number of pieces of attitude information from which the attitude of the camera is determined.

Abstract: An accessory which is mountable on a camera having film frame count data communication capability, and which can print film frame count data on a film surface comprises a detector for detecting a photographing signal generated with each photographing operation of the camera, a data reception device for receiving film frame count data from the camera by communication with the camera; and a storage device for storing film frame count data based on film frame count data received from the camera. When the detector detects the photographing signal, the storage device increments film frame count data stored therein by a value corresponding to one frame, and when the data reception device receives film frame count data from the camera, the storage device stores the received film frame count data in place of the film frame count data presently stored therein.

Abstract: A camera which can execute data communication with an attached accessory that can perform a data printing operation wherein data received from the camera is printed on a film surface comprises a release device for generating a release signal for starting a photographing operation, a transmission device for transmitting data to the accessory during a time interval from the end of a photographing operation to be beginning of a next photographing operation, and a control device for enabling the photographing operation after intervening data transmission by the transmission device when the accessory is to perform the data printing operation, and for enabling the photographing operation without intervening data transmission by the transmission device when the accessory is not to perform the data printing operation.

Abstract: There is disclosed a camera system consisting of accessories such as a speed light, a data back etc. and a camera capable of mounting these accessories, and capable of data communication between the camera and the accessory. When the power supply of the camera is turned off, a power supply activating signal is sent as a hardware signal from the accessory to the camera by the manipulation of the accessory. When the power supply of the camera is turned on, a power supply extending signal is sent as a software signal from the accessory to the camera by the manipulation of the accessory. The camera holds the operation of the power supply for a predetermined period from the latest entry of the power supply activation signal or the power supply extending signal.

Abstract: A camera data recording device comprising a control mode selector, a data mode selector and a recorder. The control mode selector sets at least one of plural control modes concerning with plural camera functions. The data mode selector selects one mode from plural data recording modes each enabling a selective recording of plural fundamental data when control mode is not set by the control mode selector, and selects one mode from plural setting modes concerning with the setting data associated with said control mode and one mode from data recording modes when one of plural control modes is set by the control mode selector. The recorder records the data on a film in response to the data recording mode or the setting mode.

Abstract: In a camera system of the present invention, two kinds of units which set picture factors for a camera, such as shutter speed and ISO value, can be selectively attached to the camera: one type mechanically sets the picture factors in a continuous operation; and the other type electrically sets the picture factors in a button operation. According to the above-mentioned composition, the camera system can be used as what is called a mechanical camera and as what is called a button type camera by exchanging the units. Thus, the camera system of the present invention can answer needs of a wide range.

Abstract: A camera which can receive an accessory for performing a data printing operation on a film surface and can execute data communication with the accessory is disclosed. The camera has a means for identifying whether or not communication is attained between the camera and the accessory and a means for transmitting a printing signal for causing the accessory to start the data printing operation from the camera to the accessory within a predetermined period of time. The transmission means changes a transmission time of the printing signal in accordance with the identification result of the identification means.

Abstract: A camera data recording device comprising a control mode selector, a data mode selector and a recorder. The control mode selector sets at least one of plural control modes concerning with plural camera functions. The data mode selector selects one mode from plural data recording modes each enabling a selective recording of plural fundamental data when control mode is not set by the control mode selector, and selects one mode from plural setting modes concerning with the setting data associated with said control mode and one mode from data recording modes when one of plural control modes is set by the control mode selector. The recorder records the data on a film in response to the data recording mode or the setting mode.

Abstract: A camera which can receive an accessory for performing a data printing operation on a film surface and can execute data communicating with the accessory is disclosed. The camera has a means for identifying whether or not communication is attained between the camera and the accessory and a means for transmitting a printing signal for causing the accessory to start the data printing operation from the camera to the accessory within a predetermined period of time. The transmission means changes a transmission time of the printing signal in accordance with the identification result of the identification means.

Abstract: A bracketing exposure control camera having a total exposure shift range calculated based on the number of frames and the exposure shift amount. If the total exposure shift range overflows a predetermined exposure shift range, then the number of frames and/or the exposure shift amount is adjusted to maintain the adjusted total exposure shift range within the predetermined exposure shift range.

Abstract: In a camera having a focal plane shutter, a magnet restrains the rearward shutter curtain in response to the supply of power to the magnet. A control device controls the period of power supply, and the restraint of the rearward shutter curtain is released when the power supply is terminated. A detecting circuit detects the termination of the power supply and outputs a detection signal. Another detecting circuit responsive to the movement of the forward shutter curtain outputs another detection signal. A selector selects one of the detection signals and inputs the selected signal to a starting circuit, which responds to the selected signal to start a flash emission.

Abstract: A system consists of a camera provided with warning means to be activated by a detection switch which is closed in cooperation with a film counter, and an accessory unit to be mounted on the camera, wherein the accessory unit is provided with means for generating a warning signal for activating the warning means when the count of shot signals of the camera reaches a number of exposures preset in the accessory unit.

Abstract: A display device for a camera constructed with a display switch to drive a display element in the camera by the first manual operation, and an illuminating switch to drive an illuminating device to illuminate the display device by the second manual operation, the display element being ensured its driving, while the illuminating device is being driven by the second manual operation.

Abstract: In a motor drive device mountable on a camera having manually operable first switch means, a magnet adapted to be energized by actuation of the first switch means and release a shutter, and first release lock means manually operated to render only the first switch means inoperable, there is provided manually operable second switch means adapted, when mounted on the camera, to be parallel-connected to the first switch means, and second release lock means manually operated to render only the second switch means inoperable.

Abstract: A speed-light, or electronic flash, having a support column provided between its light flashing part and its fitting member to be fitted with an accessory shoe of a camera body, wherein an exposure calculator device operable by a guide number is in cylindrical form so as to surround or enclose the support column.

Abstract: An electrical circuit for compensating for variations in the shutter time of the shutter mechanism in a camera which are caused by temperature variations comprises a temperature detecting circuit which generates an output voltage corresponding to the ambient temperature variation, and a control circuit which generates a compensating voltage based upon the temperature measured by the temperature detecting circuit and the known shutter time temperature characteristic of the shutter mechanism in the camera. The compensating voltage is combined with a shutter time voltage corresponding to a desired shutter time, in such a manner that the resulting voltage, which is used to control the shutter, substantially eliminates shutter time variations caused by temperature variations, thereby rendering shutter time independent of temperature.