Abstract: Disclosed are a technique that in the film feeding control of a camera, before the film is wound up, when the voltage of a battery circuit for supplying voltage to the camera is above a voltage level high enough to wind-up the film, a film winding operation is initiated, and, if this winding-up operation does not terminate normally, that the film has ended is determined and the film is rewound, and another technique that when the above-described voltage level is detected, a motor for the rewinding is used as the load of detecting the voltage level of the above-described battery circuit.

Abstract: A film feeding indication device of the type in which as a number of pulses, proportional to the distance the film has advanced, are formed, when the produced pulse number reaches a prescribed value, an indication representing the completion of film feeding is presented. The indication device, despite the produced pulse number becomes unable to reach the aforesaid prescribed value, forcibly presents that indication provided that a particular minimum value is reached.

Abstract: A multiple exposure device for a camera is arranged to permit one and the same frame portion of film to be exposed to light a plurality of times. In taking a multi-exposed photograph, the device displays a multi-exposure mode; permits a manual resetting operation on the multi-exposure mode for improved operability of the camera; and computes the degree of exposure to be effected at each step of the multiple exposure to ensure an appositely exposed state of the film frame on which the multiple exposure operation is performed.

Abstract: A mirror device for a camera having a first mirror arrangement pivotable from a finder-viewing position to an exposure or retracted position, and a second mirror arrangement pivotable with its fulcrum formed on the first mirror arrangement. While the first mirror arrangement moves pivotally from the finder-viewing position to the exposure or retracted position, the second mirror arrangement is pivotally moved from a resting position in contact with the first mirror arrangement as it is open, through a sliding movement on a camming surface of the camera body to a closing position for a half-mirrored portion of the first arrangement.

Abstract: Cameras of the kind having a computer circuit for control actions such as sequence control, etc. are arranged to render the computer circuit inoperative for prevention of an erroneous action in the event of a drop in the power supply voltage. However, in case that the voltage drop takes place during a data transfer process within the computer circuit, if the computer circuit is rendered inoperative immediately after the voltage drop, an erroneous data would be transferred to a memory circuit. Whereas, this invention provides arrangement to keep the computer circuit operative until completion of data transfer in the case of a voltage drop during the process of data transfer to the memory circuit.

Abstract: The present invention produces at least two sound signals such as warning signals or actuating signals by one sounder having a resonant frequency, wherein one of the sound signals is indicated by the resonant frequency of the sounder to enable a higher intensity sound to be produced.

Abstract: In the disclosed exposure time reproducing device, a digitally suppressed exposure time datum is expanded by shifting the decimal part of the datum according to the contents of its integral part. The expanded datum thus obtained is read out by means of pulses of a predetermined frequency.

Abstract: An indication system of a camera for audibly and distinguishably indicating at least two different kinds of information of the operating state of a self-timer, a warning against the photographing operation for insufficient brightness of the object or low range of a shutter speed, the voltage checking of a battery and the other necessary information for photographing operation. The indication system comprises an acoustic device having a sound which varies in volume, tone or time interval thereof in accordance with various kinds of output signals of a controlling circuit for digitally controlling the acoustic device by means of counting signals of a binary counter.

Abstract: An exposure time control device includes electromagnets for causing corresponding leading and trailing shutter curtains in a camera to travel. A second timer circuit, which is adjustable, is arranged to count a correction time in response to operation of a first timer circuit which counts an exposure time for the camera. After the lapse of the correction count time of the second timer circuit, the electromagnet for the leading shutter curtain is actuated, and then the electromagnet for the trailing shutter curtain is actuated after the lapse of the exposure count time of the first timer circuit. Exposure time errors which would otherwise result from overlapping of the shutter curtains and response delay of the trailing shutter curtain electromagnet, thus can be corrected by adjustment of the second timer circuit.

Abstract: When the film is being transported, a signal forming circuit produces a pulse signal. Based on this pulse signal, a prescribed plurality of signals are formed and applied to a decoder driver so that a plurality of displaying areas positioned side by side in a display are actuated successively in one direction. As the displayed pattern appears to flow, the camera operator is able to recognize that film transportation is in progress.

Abstract: The present invention relates to the exposure compensation information forming apparatus for a camera, particularly for forming the aperture and the totally opened aperture value information. Until now in order to compensate the totally opened aperture value contained in the output of the light measuring circuit and the aperture value the information setting means for the totally opened aperture value and that for the aperture value are provided, whereby both setting means are mechanically engaged with each other so as to form the totally opened aperture and the aperture information. Thus, the engaging mechanism of both of the above means is complicated, which is inconvenient. The present invention provides an exposure compensation information forming apparatus by means of which the aperture information can be composed from the totally opened aperture with a very simple circuit composition so as to overcome the above disadvantage.

Abstract: In the disclosed device, a signal forming circuit produces a signal having a frequency corresponding to the voltage of a power source. A level detector detects the level of the voltage of the power source and is arranged to produce a signal when the voltage of the power source drops below a predetermined level. A control circuit coupled to the signal forming circuit is arranged to change the frequency of the signal produced by the signal forming circuit in response to the signal produced by the detector. An indicator operates at the frequency of the signal produced by the signal forming circuit. In a specific embodiment, a detector detects whether the voltage of a battery is at and below a first level, between the first level and a second higher level, and at and higher than the second level.

Abstract: In the disclosed indicator, a display responds to various photographic modes, i.e., shutter preference, program, etc. A control arrangement connected to the display changes the display in response to a control signal indicating that a selected shutter time is shorter or longer than a shutter time faster than hand vibrations.

Abstract: In the disclosed device, the character of sound formed by a sound generator is varied by placing the sound generator in a chamber and varying the chamber to produce at least two sound modes indicating at least two data. According to one embodiment, an aperture in the chamber is covered with a shield accessible from the outside of the camera housing. According to another embodiment, the resonant frequency of the sound is varied by varying the shape of the chamber. In a third embodiment, the chamber is covered and uncovered by varying the registry of two series arranged apertures to the chamber.

Abstract: A flash system including a computer type electronic flash unit and a camera. The computer type electronic flash unit includes an output terminal at which a signal representing the fully charged condition of an electrical energy storage capacitor is produced, a firing stop signal generating circuit and a signal supply circuit for supplying the output of the generating circuit to the output terminal. The camera includes an indicating device connected to the output terminal for indicating the firing stop signal transmitted from the output terminal. The camera also includes an override circuit for inhibiting the charge completion signal from being transmitted to the indicating means in response to a release operation of the camera.

Abstract: An electromagnetically driven shutter for camera for driving the shutter blades by means of an electromagnetic driving source being characterized in that the current supply circuit to the electromagnetic driving source from the camera power source is provided with a condenser which is normally charged with the output of the camera power source or its step up circuit in such a manner that by means of the driving pulse produced with the shutter release the charge of the condenser is superposed over the power source voltage and delivered to the electromagnetic driving source so as to increase the starting speed of the shutter blades.

Abstract: An antibounce device for an electromagnetically driven shutter of a camera in which a braking current flowing in the direction reverse to the direction of a driving current is supplied to a shutter blade driving coil for a predetermined period of time immediately before completion of the travel of shutter blades.

Abstract: A voltage detecting device for a camera arranged to use an analog-to-digital converter of the camera in common. A signal representing the power source voltage of the camera to be detected is impressed on an integrator of the analog-to-digital converter. There is provided an annunciating means such as a light emitting diode or a sound emitting body which changes the condition of the output thereof alternately in accordance with charge and discharge of the integrator and has a span of output time in each of the output conditions corresponds to a span of charge time or a span of discharge time of the integrator.

Abstract: A slit exposure shutter which has an electromagnetic drive source and is arranged to have shutter blades moved by rotation of a rotor not exceeding a half turn to perform exposure effecting and returning travels. The weight of the shutter blades and that of the rotor are arranged to be approximately in balance by having the rotation shaft of the rotor eccentrically disposed in a position deviating from the center of the rotor.