Abstract: An aperture module includes a rotation plate disposed on a base, a moving portion that moves linearly to rotate the rotation plate, and blades linked to the rotation plate to form an aperture having a variable size. The blades include at least two small-aperture blades that are contracted inwardly toward an optical axis to form the aperture having a first size and at least two medium-aperture blades that are contracted inwardly toward the optical axis to form the aperture having a second size larger than the first size. The at least two small-aperture blades and the at least two medium-aperture blades are extended outwardly away from the optical axis to form the aperture having a third size larger than the second size.

Abstract: A rotary encoder has a disc, a pair of photo-interrupters, an adjusting member, and a shifting controller. The disc rotates around a rotating axis and has slits that are formed circumferentially at given intervals. Each of the photo-interrupters has a light-emitting device and a photo-detecting device opposite one another, and generates two signals with a phase difference. Each photo-interrupter is pivotable around a pivot coaxial with the rotating axis, and is arranged along the circumferential direction of the disc so as to position the slits between the light-emitting device and the photo-detector. The adjusting member contacts the pair of photo-interrupters, and is movable along a shifting direction corresponding to a radial direction of the disc, so as to engage the pair of photo-interrupters. The adjusting member adjusts a relative position-relationship between the pair of photo-interrupters associated with the phase difference.

Abstract: A quantity-of-light adjusting device comprises a first quantity-of-light adjusting blade and a second quantity-of-light adjusting blade which move to adjust quantity of light, and a detecting member which detects that the first quality-of-light adjusting blade is at a predetermined location while also detecting that the second quantity-of-light adjusting member has moved to the predetermined location following the first quantity-of-light adjusting blade moving from the predetermined location, so that the state of adjusting of the aperture with the quantity-of-light adjusting means can be detected by a single detecting member.

Abstract: A quantity-of-light adjusting device comprises a first quantity-of-light adjusting blade and a second quantity-of-light adjusting blade which move to adjust quantity of light, and a detecting member which detects that the first quantity-of-light adjusting blade is at a predetermined location while also detecting that the second quantity-of-light adjusting member has moved to the predetermined location following the first quantity-of-light adjusting blade moving from the predetermined location, so that the state of adjustment of the aperture with the quantity-of-light adjusting means can be detected by a single detecting member.

Abstract: A lens barrel drive mechanism includes a system for detecting the number of revolutions of the output shaft of a motor, which is associated with the amount of extension of the lens barrel to which the rotating force of a gear in a gear train is transmitted. The system is provided in the generally triangular space between a cell compartment and a film cartridge compartment in a camera body.

Abstract: A camera having a shutter instrumentation device for accurately measuring the actual shutter time. The camera includes a shutter which travels in a travel plane to open and close an aperture. A signal projection unit, positioned to one side of the travel plane, projects a signal towards the travel plane of the shutter so that the signal reflects off the shutter when the aperture is closed by the shutter and so that the signal passes through the aperture when the aperture is opened by the shutter. A reflecting member, positioned on the opposite side of the travel plane as the signal projection unit is positioned, reflects signals projected by the signal projection unit which pass through the aperture.

Abstract: A film feed apparatus detects the feed speed of a film having one perforation formed in a leader, and two perforations respectively formed at positions corresponding to the leading and trailing ends of each photographing frame. The apparatus includes a driving source for feeding the film, a sensor for detecting the passage of the perforation when the film is fed, a time measuring circuit for measuring the time between the instant at which the sensor detects the passage of the first perforation positioned at the leader (or the leading end of the photographing frame) and the instant at which the sensor detects passage of the second perforation positioned at the leading end of the photographing frame (or the next photographing frame), and an arithmetic circuit for calculating the feed speed of the film on the basis of the measurement result obtained by the time measuring circuit.

Abstract: In an exposure precision tester for a camera, including a flexible wiring board where a photometric sensor is implemented is contained in a case. The case has an appearance similar to that of a film cartridge loaded by drop-in operation and is insertable into a film cartridge cell of the camera. Exposure test can be performed without a back lid because the photometric sensor measures and outputs the exposure energy in the state that the photometric sensor is positioned at a film mask portion by rotating an operation part of a feed shaft with the case being inserted in the camera.

Abstract: A camera has a lens barrier apparatus in which the lens barrier apparatus is driven by a motor that is also used to drive another mechanical element in the camera. The motor is switched between the lens barrier apparatus and the mechanical element by the movement of a lens barrel. The driving of the lens barrier apparatus and the mechanical element are controlled in accordance with the output of a single sensor, for example an encoder. The driving of the lens barrier apparatus is controlled such that the barrier will not close unless the lens barrel is at the housed position and such that if the lens barrier does not open, the lens barrel will not move. The driving is further controlled such that if the lens barrier apparatus does not move to its intended state, the drive is reversed prior to again attempting to drive to the intended state.

Abstract: A control device for feeding and positioning a film precisely, in a camera, a printing apparatus, etc., includes a photo interrupter with a light emitter, a light detector for detecting a light emitted from the light emitter, and a holding member for keeping both the light emitter and the light detector in position; a frame with a guiding member for guiding a film having a longitudinal edge with a plurality of perforations which travels between the light emitter and the light detector of the photo interrupter; a perforation detector for detecting a perforation based upon a signal outputted from the light detector, which outputs the signal each time a perforation of the film edge passes a location corresponding to an optical axis existing between the light emitter and the light detector; and a controller for controlling a film feeding operation in accordance with the detection of a perforation by the perforation detector.

Abstract: When a photographic film cassette is loaded in a camera and a rear lid of the camera is closed, a current adjusting circuit supplies a light emitting element of a photo-sensor with a drive current while stepwise increasing the value of the drive current and comparing a maximum value of the output signal from the photo-sensor with a predetermined maximum level. The value of the drive current, at which the maximum value of the output signal reaches the predetermined maximum level, is stored as an optimum current value. Thereafter, photographic film is advanced from the cassette to position each exposure frame in an exposure aperture of the camera, with reference to the position of perforations formed in association with the exposure frames. The position of each perforation is determined based on a rising edge of the output signal from the photo-sensor while driving the light emitting element at the optimum current value.