Abstract: A voltage detecting means is provided in a flash lamp firing circuit for detecting the attainment of the voltage of a storage capacitor to a satisfactory lamp firing voltage level to assure that a photographic camera associated with the flash lighting unit operates in a flash exposure range switched from a daylight exposure range only when a sufficient voltage is available to fire the lamp at the time of striking of the lamp.

Abstract: In the disclosed arrangement, a data set separate from a camera includes a set of sequentially actuable numeric entry keys for entering numerical data representing various camera functions into a data control device which transmits data for energizing numerical illuminators at the film plane of a camera through a connecting element.

Abstract: In the disclosed arrangement, a data set separate from a camera includes a set of sequentially actuable numeric entry keys for entering numerical data representing various camera functions into a data control device which transmits data for energizing numerical illuminators at the film plane of a camera through a connecting element.

Abstract: An indicating device of computer type electronic flash apparatus has a plurality of display members representing respective limited distance ranges for correct exposure of an object to be photographed. Each of the display members corresponds to a respective set diaphragm value. The indicating device further includes a plurality of indicating marks provided on the same plane of said display members and corresponding to respective set diaphragm values. With this device, it is possible to be aware of the proper distance range satisfactorily.

Abstract: Disclosed is a slide switch in which a slide is slidable between a first position and a second position. A holding arrangement holds the slide in the second position when the slide has moved into the second position and permits the slide to return from the second position to the first position after a given lapse of time. A manually operable lever covering the slide serves to operate the slide. The lever is held at least at one position and forms a recess sufficiently large to enable the slide to return from the second position to the first position.

Abstract: A shutter control circuit which normally responds to ambient light switches automatically to a flash mode in response to a charge signal from a flash unit. The light flash eliminates the charge signal. To prevent the absence of a charge signal from returning the shutter to daylight control, a shutter closing signal is generated before a flash synchronizing contact is closed and hence before the charge signal ends. However shutter closing action is then started only after a delay that provides time for the flash to occur when the shutter is fully open.

Abstract: The present invention relates to a device for flash light photography and, more particularly, to a device for flash light photography for adjustable light stroboscope. A major feature of the present invention is that the adjustable light condition of the stroboscope is rendered to be adjusted, based on the film speed and diaphragm value, independently of each other. Thus, when the film speed is made high, the responsive distance for light adjustment is elongated.

Abstract: An exposure correction factor setting device is disclosed which includes an exposure correction factor setting dial, a brush connected to the dial and arranged to be operated when the film speed is manually adjusted, and a bias device connected to a variable resistor for manual adjustment of the film speed so as to apply to a film speed signal producing device for automatic adjustment of film speed a bias signal corresponding to the exposure correction factor set by the dial. It is thereby possible to utilize the exposure correction factor setting device in automatically setting a film speed by a film cassette as well as in manually setting the film speed.

Abstract: An automatic exposure control system permitting for a photographic camera to make an exposure in either of the shutter preselection automatic exposure range and the diaphragm preselection automatic exposure range is established by combination of an adapter unit with the camera. This adapter unit has a housing attachable to and detachable from the camera body, and includes an exposure operation and control circuit capable, upon preselection of an exposure time, of deriving an exposure value representing an effective exposure aperture, and, upon preselection of diaphragm value, of deriving an exposure value representing an exposure time. Responsive to the output of the adapter unit, the control device in the camera body controls operation of the shutter and diaphragm mechanisms thereof selectively in accordance with the exposure value derived from said exposure operation and control circuit.

Abstract: A self-adjusting electronic flash is attached to an interchangeable lens camera having a shutter-priority exposure control. For flash operation, aperture information suitable for electronic flash and the film sensitivity is automatically conveyed to the camera's diaphragm control. Thus the aperture can be automatically adjusted for flash as well as daylight operation.

Abstract: The present invention relates to a shutter time control circuit of the type in which the shutter time is changed over into a predetermined value for flash light photography in response to a flash charge completion signal from the flash light device. In order to eliminate the shortcoming of the conventional shutter time control circuit of this type, in that when the shutter time is changed over into the value predetermined for flash light photography predetermined shutter time is memorized in a memory capacitor for controlling the shutter time in accordance with the value memorized after the charge completion signal has disappeared.

Abstract: A device adapted for the purpose of enabling the use of presently available interchangeable photographic lenses in recently developed digitalized single lens reflex camera systems. This device is constructed in the form of an adaptor attachable to and detachable from the body of an interchangeable lens mount and capable, upon attachment to a conventional interchangeable lens, of providing information representing the full open F number of the interchangeable lens in the form of a coded digital signal. This signal is applied to a digitalized camera body associated therewith and provided, for example, with an inputting device adapted to receive the full open F number of the interchangeable lens as coded digital signal.

Abstract: A flash exposure control system comprising a flash lighting unit, a battery circuit connected to said flash lighting unit to energize said flash lighting unit during an exposure, a switching arrangement connected to said flash lighting unit to control the termination of energization of said flash lighting unit, a timer for controlling the conduction of said switching arrangement, the timer having an adjustable circuit for adjusting the duration of conducting time as a function of the camera-to-object distance and the adjustable circuit being responsive to the camera focus adjustment, and an aperture adjusting unit responsive to the focus adjustment for defining an exposure aperture.

Abstract: The present invention refers to an apparatus for taking photographs of an object in close proximity by means of a flash. A proper exposure is obtained for the object in close proximity with the use of flash equipment with variable illumination intensity, in accordance with the equation ##EQU1## L: Distance to the object M: Photographic magnificationa: ConstantN: Film sensitivityPe: Effective lighting quantityF: Aperture of diaphragmThe flash equipment is designed in such a manner that the flash light part of the flash equipment can nearly be brought in alignment with the optical axis of the objective of the photographic camera while the illumination intensity of the flash light can be varied.

Abstract: The time period necessary to charge a current-to-light convertible energy storing capacitor to a certain voltage is reduced as compared with prior art devices. The energy storing capacitor is connected across a flash tube and switching element series-connected with each other. The switching element is provided with a control circuit, responsive to the voltage of the storage capacitor decreasing to a level at which the flash tube is stopped from producing flash light, for producing a terminating signal by which the switching element is brought into the open or non conducting state. With this arrangement, it is made possible to prevent complete discharge of the electric charge stored in the storage capacitor from occurring, thereby providing the advantage of saving a good fraction of the charging time period which would be otherwise necessary when the storage capacitor is completely discharged to zero voltage.

Abstract: A device for automatic control of the quantity of light from an electronic flash tube including a silicon controlled rectifier connected in series with the flash tube, a circuit for applying a reverse voltage between the main electrodes of said silicon controlled rectifier so as to open said rectifier, and a switching element connected between said reverse voltage applying circuit and said silicon controlled rectifier. Responsive to the output signal from the reverse voltage applying circuit, the switching element short-circuits the gate electrode and cathode of the rectifier. With this arrangement, it is possible to decrease the capacity of a commutation capacitor constituting part of the reverse voltage applying circuit.

Abstract: A film rewinding device for a camera using a motor for rewinding film. Upon completion of film rewinding, the device automatically stops the film rewinding operation with detecting means disposed in the device to detect the completion of film rewinding. This is done by utilizing the difference between the load on the motor during the rewinding operation and the load at the completion of the rewinding operation.