Abstract: A lens-fitted film unit and production thereof, wherein lens-fitted film unit has a front cover, a rear cover, a main body and a magazine chamber lid to take out a film magazine from a film magazine chamber located in the main body, below the film magazine chamber and at the bottom surface of the lens-fitted film unit. The front cover, rear cover and main body have respectively a rib, and the surrounding of the lower portion of the film magazine chamber is surrounded by the rib of the front cover, the rib of the rear cover and the rib of the main body. After the rear cover is attached, the film magazine chamber lid is attached so that the magazine chamber lid is fixed to the front and rear cover and is not fixed to the main body.

Abstract: A single use camera with a built-in electronic flash includes a main body; a photographic film loaded in the main body previously; an electronic flash unit having an electronic flash light emitting section and an electronic flash circuit; and a photographing unit having a photographic lens and a shutter, wherein the following condition is satisfied, 6≦A≦10 wherein A represents an exposure value, which is determined by an aperture value, a shutter speed and a sensitivity of a film loaded in the single use camera, when photographed in a condition in which the electronic flash unit is used.

Abstract: A lens-fitted film unit including a main body; a photographic film, pre-loaded in the main body; an electronic flash unit; a shutter unit; a camera lens; and a diaphragm. In the lens-fitted film unit, a guide number of the electronic flash unit, a T-number determined from the camera lens and the diaphragm and a shutter speed of the shutter unit are determined so that A is not more than 8.5 when A represents an EV value of a reference exposure amount of the lens-fitted film unit under a stroboscopic photographing state minus 1.5; and intensity of a latent image, formed on the photographic film under the condition that a reference reflection panel being placed at a predetermined distance between 2-3 m from the lens-fitted film unit is illuminated by the electronic flash unit without other lights in the stroboscopic photographing state, corresponds to intensity of a latent image obtained under a photographing condition of photographing luminance not more than A+5.0 in EV value.

Abstract: A strobe circuit for use in a lens-fitted film unit is composed of a metallic thin plate punched in a circuit pattern; and insulating plate materials covering both obverse and reverse surfaces of the metallinc thin plate; wherein a part of the metallic thin plate is used as a component of the strobe circuit.

Abstract: A single lens reflex camera is provided with a photocell so positioned in the camera as to receive thereon light incident through the lens and reflected onto the photocell by the mirror. During each photographing operation, the mirror is pivotally elevated so that the incident light is no longer received by the photocell. The camera electronics monitors the photocell output which is representative of the magnitude of light received by the photocell and, unless a relatively rapid change in photocell output is detected during a photographing operation, an alarm is actuated to indicate failure of the mirror to properly pivot.

Abstract: In a motor-drive film-winding camera of the type capable of multiexposure, having separate motors for cocking the shutter (or the mirror in a single lens reflex camera), and for film winding, a changeover is provided to switch from normal operation with energization of both motors to a multiexposure mode providing for double exposure operating the shutter cocking motor while the film-winding motor remains idle. Operation is limited to a double exposure since when the latter is completed, the changeover switch is overridden and the system returns to normal operation.

Abstract: A motor driven type camera includes a shutter charging motor, a film winding motor, and a selecting member selectively operable for preventing only the film winding motor from being driven so as to enable selective performance of multiple exposures. A logic driven automatic restoration circuit activates a solenoid to return the selecting member to its inoperative condition following completion of a user-initiated multiple exposure to thereby prevent a subsequent inadvertent exposure of the same frame of film as a consequence of the user's having forgotten to return the selecting member to its normal or initial position.

Abstract: An automatic film feeding apparatus for a camera includes a first switch operable in response to the opened or closed position of the camera rear cover, a second switch operable in response to the position of a film counter, a third switch operable in accordance with the position of a film strip in a camera, and an electronic control circuit for operating a film winding motor drive mechanism in response to predetermined states of the first, second, and third switches.

Abstract: Battery voltage level warning is made according to the output signals of two detecting circuits. A first detecting circuit detects the power supply voltage having lowered to a value somewhat above the lower limit of the operation power supply voltage of an electronic system. The output thereof supplies weak battery warning. The second detecting circuit detects the power supply voltage having lowered to the lower limit level of said operation power-supply voltage. The output thereof prohibits the operation of said electronic system. Thereby, desirable battery-replacement times becomes clarified and the malfunction of said electronic system is prevented.

Abstract: A camera in which the automatic exposure control is conducted on the basis of measured light information obtained in accordance with the illumination of an object to be photographed. In the camera, a type of exposure control information that is predetermined irrespective of measured light information is supplied as first exposure control information into an exposure control circuit including an analog to digital converter. Subsequently, measured light information obtained through the operation of a shutter release of the camera is supplied thereinto as second exposure control information.

Abstract: The power supply resetting circuit of the invention is adapted to be used in such a type of camera that the shutter release action comprises two steps of strokes: a first stroke by which a power supply circuit for electric circuits mounted in the camera, such as a light measuring circuit, is closed, and a second stroke by which at least the operation of the circuits mounted in the camera is started. The power supply resetting circuit has a self-holding circuit for closing the power supply circuit and additionally mounted to the electric circuits in the camera. The self-holding circuit is adapted to be turned into operation by the second stroke of the shutter release action, substantially simultaneously with the starting of operation of the circuits mounted in the camera, and to be turned inoperative, so as to break the power supply circuit, at the instant at which the photographing sequence is completed or with a certain time lag to that instant.