摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
A film magazine is provided with a peripheral surface carrying at least one photoelectrically discriminatable strip-like mark indicative of the sensitivity of film contained within the magazine, and a photographic camera having a shutter operating circuit automatically adjustable in accordance with the sensitivity of photographic film contained within such a film magazine inserted into the camera includes photoelectric discriminating means located in the camera for discriminatably reading the at least one strip-like mark on the film magazine when placed in the magazine chamber.
摘要:
A camera which includes a liquid crystal focusing screen and an exposure control circuit that measures light reflected from the subject to be photographed after its passage through the liquid crystal screen is further provided with a circuit for compensating the light value determined by the exposure control circuit when operating voltage is not applied to the focusing screen so as to thereby compensate the amount of light measured through the screen when the nonapplication of operating voltage to the focusing screen causes the screen to transmit light therethrough less readily than when operating voltage is applied thereto.
摘要:
The color image forming machine such like a color printer or a color copier for forming a color image on a recording sheet. The image forming machine includes a photoreceptor belt; a belt driver for rotating the photoreceptor in a longitudinal direction; a laser beam scanner for repeatedly scanning the photoreceptor in a direction perpendicular to the longitudinal direction, with the laser beam, so that the latent image is formed on the photoreceptor; a developer for developing the latent image with plural color toners; a measuring unit for determining a rotation time of the photoreceptor; and a controller unit for controlling a scanning frequency of the laser beam scanner so that one scanning time of the laser beam scanner is set to the result of dividing the rotation time of the photoreceptor, while the photoreceptor rotates one round, by an integer.
摘要:
A camera device wherein a one-way clutch or a friction clutch is provided between a driving power source and a winding spool, a one-way clutch or a friction clutch is provided between a rewinding shaft and a rewinding spool, said driving power source and a sprocket, or a one-way clutch or a friction clutch is provided between a shaft of said sprocket and the same sprocket. The speed of revolution in a rewinding direction of said driving power source during a rewinding operation is set to a level not lower than a speed of revolution of said winding spool rotated in the rewinding direction by a film being rewound. The winding power source and the rewinding shaft both of which are adapted to be rotated positively at different speed ratios.
摘要:
An automatic exposure control method and device has photometry means for detecting the brightness of a subject and providing an output signal in response thereto, a shutter, driving means for driving the shutter toward a full aperture, closing means for closing the shutter in accordance with the output signal from the photometry means, and adjusting means for adjusting the photometry means in a stepwise manner to provide the output signal variably in accordance with the light detected and the opening position of the shutter. In one embodiment, the driving means for opening the shutter engages a series of contacts for correspondingly short-circuiting photoelectric elements providing the electrical signal output, thereby varying in a stepwise manner the charging of a capacitor in a comparator circuit for disengaging a solenoid controlling the shutter closing means.
摘要:
Disclosed is an apparatus adapted to be used in a single lens reflex camera for detecting whether a correct focal adjustment has been made. The apparatus includes a pair of focal point detecting optical systems placed relative to each other on symmetrical positions with respect to an extending optical axis which is turned by an optical reflecting means, at the rear of a semitransparent movable mirror. A position where an image of an object on a main optical axis of the object lens, is focused by said object lens when an observing point of the object is placed in a position with an infinity distance, is determined as a basic point. The optical axes of said pair of focal point detecting optical systems cross with each other at said basic point. A photo-electric detecting plate is arranged in the vicinity of a film surface. A position on said detecting plate where an image of the object on said basic point is projected by said focal point detecting optical systems is determined as a cardinal point. A correct focusing is detected electrically when the observing point of the object is projected onto said cardinal point.