Abstract: A data printing device for use in a photographic camera includes an electronic clock for providing time and date data to be printed in digital form on the associated film in the camera. In one embodiment, the data are grouped into two parts which are printed in time-displaced relation to each other on a common picture frame, while the data are prevented from changing during the printing operation, as time passes on. The display of data is effected only when printing is performed, or when required or desired values of time and/or date are set in the electronic clock, thereby the consumption of electrical energy of a common battery of the exposure control apparatus in the camera is minimized.

Abstract: A photographic device includes means for automatic control of the quantity of light from an electronic flash by comparing the brightness of a main object to be photographed with the brightness of a sub-object to be photographed, and the shutter of the camera opens during the time in response to the brightness of a sub-object to be photographed.

Abstract: An automatic winding up device for a camera, in which a device for detecting the winding up completion signal supplied from the camera body as well as a delay device starting to operate by the detection of the winding up completion signal by the detecting device are disclosed. These devices operate in such a manner that the current supply to the winding up motor is maintained during the operation of the delay device. This acts to overload the motor for a certain time determined by the delay device after the completion of the winding up operation and overloads the winding up mechanism of the camera body. The current supply to the motor is interrupted after lapse of a time determined by the delay device so as to stop the motor. The winding up member is driven in the reversed direction by the reaction of the overload exercised on the winding up mechanism so that the load exercised on the camera is released at the termination of the winding up operation.

Abstract: A camera having a data recording device wherein there are provided an optical path for photographic insertion of data and an optical path for displaying data. Each of these optical paths has a light inlet disposed, independently of the other, in the same light flux emitted from a data source. Photographing data are photographically applied to a film surface and are also displayed inside a view finder by means of a data signal of light which is introduced directly into each of the optical paths.

Abstract: An exposure control device for a camera, having a first light receiving element for sensing light beams reflected from a film surface and a second light receiving element for sensing light beams from an object before taking a photograph. In this arrangement an auxiliary diaphragm, which is opened as a shutter is closed and is closed as the shutter is opened, is provided in front of the second light receiving element. The first and second light receiving elements are connected in parallel between input terminals of an operational amplifier for the light measuring. Accordingly, an exposure control with a high degree of accuracy is effected based on an output of the light measuring operational amplifier.

Abstract: An exposure control device for a single lens reflex camera has an exposure calculating mechanism for determining the amount of exposure in accordance with desired shutter time, aperture value, film sensitivity and brightness of the object to be photographed. The exposure calculating mechanism is carried along one external wall of a casing for the reflex mirror of the camera.

Abstract: A filter for compensation of spectral sensitivity is provided in front of a light receiving element through a light shielding tube. A light source emitting such light as having wave length characteristics which fall within a sensitive wave length zone of the light receiving element yet fall outside of transmitting wave length zone of the filter is provided between the filter and the light receiving element. Light from outside irradiates the light receiving element through the filter while light from the light source is so controlled as irradiating the light receiving element but not leaking through the filter to outside, so that the light from the light source can irradiate the light receiving element without any relationship with the irradiation of outside light on the light receiving element.

Abstract: A shutter release system for a camera having an electric shutter, made so that when a power source battery is exhausted preventing a shutter control circuit from properly functioning, it is detected to block shutter release and an electric control mode is changed over to a mechanical control mode by handling a change over means for conducting an exposure with a constant period of time.

Abstract: A power supply circuit for a camera wherein a detection circuit which detects the voltage of a power source is provided for supplying an electric power to the electric circuit of the camera only when the detected voltage is above a preset value.In the power supply circuit, the power supply is controlled by a detection output obtained after a voltage detecting action is performed in a stable condition by the detection circuit. The power source voltage is detected in a manner suitable for the characteristic of the battery employed. Further, the voltage detection is performed only momentarily to prevent unnecessary power consumption for voltage detection.

Abstract: In the disclosed arrangement, an energy storage device such as a capacitor is discharged through a flash lamp. A sensing device produces a signal when the storage voltage is sufficient to fire the lamp. A switchover device normally permits the shutter and exposure aperture to be set for daylight operation, but automatically responds to the signal to switch the shutter speed and the exposure aperture to suitable values for flash operation.

Abstract: A leak current suppressing printed circuit board in which the input circuit is so designed that between the input terminals a light sensing photoelectric converting element operating in the current mode is connected. The input is guarded by means of the circuit net, whose potential is same as that at the input terminal of the inverting input circuit or the non-inverting input circuit of the high input impedance operation amplifier.

Abstract: An adapter matches an electronic flash unit with a single terminal carrying diaphragm and charge data to a camera having separate terminals for these data. A second adapter matches a flash unit having two terminals for diaphragm and charge data to a camera in which these data pass through a single terminal. Circuitry in the adapters combine or separate the data as needed.

Abstract: An exposure control device in which the output of a light measuring circuit which produces an electrical signal corresponding to the brightness of an object is compared with an output of a level signal circuit which produces an electrical signal of a predetermined level. When the compared value reaches a predetermined value, a flash circuit is made ready to flash, whereby the shutter time is changed over to a predetermined time suited for a flash photography and the flash circuit is made to flash in association with the shutter operation and the shutter is controlled with a constant time.

Abstract: In a camera provided with a day-light exposure range and with a flash exposure range, an automatic exposure control system for controlling the iris of the camera in accordance with a computed exposure value and a preselected shutter time is associated with a flash exposure time range bracketing device in order to insure that the formation of a correct flash exposure aperture is effected with automatic selection of one of the bracketed exposure times despite an accidentally incorrect setting of the shutter dial of the camera which may be encountered particularly when the day-light exposure range is to be left for the flash exposure range without the necessary manipulation of the shutter dial therefor.

Abstract: A selector circuit interrupted by an electrical signal from an attachment selectively mounted on the camera body and is connected in the light receiving circuit as well as the exposure determining circuit provided in the camera. When the above mentioned unit is mounted on the camera the exposure determining circuit provided in the camera is automatically connected from the light receiving circuit to the output terminal of the unit by means of the selector circuit, so as to receive the exposure value signal on the unit and set the exposure value corresponding to the exposure value signal.

Abstract: A focal plane shutter unit for a camera has a dimension-stable framework which has a rear wall member provided with an exposure aperture and with a film guide channel defining a path of the film behind the exposure aperture and which has a front surface to which a support structure having means for receiving and holding a lens mount is fixedly secured so that a predetermined spatial relationship between the objective lens and the film plane is established with dimension-stability, though the internal and external camera housing sections are made from a dimension-unstable material such as plastic. The framework is further adapted to carry front and rear shutter curtains with respective drive means, front curtain actuating means, rear curtain actuating means, and shutter cocking means coupled to the film wind mechanism of the camera.

Abstract: The present invention relates to a light measuring circuit consisting of an operational amplifier, a feed back path connected with said operational amplifier, a photo voltaic cell and a switching circuit for bringing the input terminals of said operational amplifier to the same potential at the time light measurement is commenced. By means of this switching circuit connected to the light measuring circuit the delayed response of the light measuring circuit due to the stray capacitence existing between the input terminal of the operational amplifier and ground is remarkably improved.

Abstract: A camera system is composed of a flash and a camera in which the diaphragm and shutter time control as well as the indicating mechanism are automatically switched into a flash mode in response to the charge accumulation completion signal from the electronic flash discharge device.

Abstract: An exposure control system for a camera capable of deriving more reliable and accurate exposure values over an extended range of scene luminance despite variation of the ambient temperature of the system than was previously possible. The exposure control system is characterized by the use of a photovoltaic cell and a logarithmic converter connected thereto in combination with a voltage stabilizer for providing output current signals of which the values are independent of temperature to the automatic camera diaphragm aperture regulating mechanism. The logarithmic converter consists of an operational amplifier with a feedback diode connected between the input and the output of the operational amplifier.

Abstract: The present invention relates to an exposure meter circuit of a camera with a matching network for a flash device with which camera auxiliary light photography can be carried out the flash device presents a detecting output terminal of a detecting network for detecting the level of the stored energy of an energy storing means provided in the flash circuit of the flash device, a voltage supply terminal for supplying the operation voltage to the detecting network and a synchronizing terminal for triggering the flash device. With this camera, daylight photographing can also be carried out without a flash device. The exposure meter circuit is characterized in that in the exposure meter circuit a current source is included for the exposure meter. A first switching means is connected with one electrode of the current source. Grounding of the current source occurs in functional connection with the switching of the flashlight photographing over to the daylight photographing.