Abstract: In an automatic control type electronic flash unit having a light-sensing element for sensing reflection of light generated by an interior light discharge tube with the aid of charging current of a capacitor, light emission of the interior light discharge tube is automatically disconnected when the light-sensing element has sensed a predetermined quantity of light. The electronic flash unit includes means for indicating that light has been automatically controlled, first signal generating means for generating a first signal when the light-sensing element has sensed a predetermined quantity of light, and means for receiving the signal as input and for rendering the indicating means operative upon reception of the signal.
Abstract: An electronic camera shutter control circuit having a reversible counter for counting a number of pulses proportional to the duration of an exposure time. When the camera shutter is opened pulses are subtracted from the memory content of the reversible counter until the counter content is zero and the exposure is terminated. The reversible counter includes a final stage which does not change state if the number of pulses applied to the counter exceeds the memory capacity of the counter. For this condition the exposure time is first controlled by the charging time of a capacitor until a voltage stored in the capacitor exceeds a certain value whereupon the memory content of the counter is subtracted until it is zero and the exposure is terminated.
Abstract: A photographic camera provided with a focal plane shutter having a plurality of vertically-movable shutter blades, in which at least a part of the leading-shutter blade consisting of a plurality of thin plates is positioned, in order to reduce the height of the camera as a whole, into the optical path of the view finder optical system of the camera when the leading-shutter blade has been brought into its opening position where it opens the exposure aperture in response to the shutter release.
Abstract: An adjustable exposure control adapter for cameras is described which includes a light producing source, such as a LED, which is mountable in juxtaposition to a photo cell forming part of the automatic exposure system of the camera. A hand unit, connected to the light source, includes a battery, a potentiometer and a series of switches. One switch is connected to the photo release mechanism of the camera while another switch, when closed, permits maximum current to flow through the light source to produce the maximum brightness which almost instantaneously closes the shutter. Another switch, when closed and the potentiometer has been set to a predetermined value, causes a current to flow through the light source which is less than the maximum with corresponding less light being emitted by the source.
Abstract: An optical system for a luminaire, such as an outdoor floodlight, is provided by an assembly of reflectors. The main reflector assembly has a simply curved preformed back component and a pair of side components that are formed in the desired shape by forcing them into place between appropriate holding members in the luminaire housing. Top and bottom reflector components may be added to provide improved optical efficiency, improved appearance and separation thermally, mechanically and electrically between the optical chamber and other portions of the luminaire. All reflector components may be made of thin gauge prefinished reflector stock.
Abstract: Imaging apparatus, in which an original is subjected to reflex imaging, is provided with exposure control for selectively varying the angle of incidence upon a platen of a predetermined amount of light emanating from a light source. Exposure control is provided by an electrooptic cell comprising a layer of liquid crystalline composition between two electrodes and having a reflecting surface. The exposure system of the present invention is particularly suited for use in automatic copying machines having compact scanning apparatus.
Abstract: The camera is for use with film cartridges and is provided with an internal support member within the camera housing which has a film engagement surface thereon. Side walls of a guide channel extend from the support member substantially beyond the plane of the film engagement surface. When the cartridge is fitted in the camera the cartridge web is located in the guide channel together with the film and the film engagement surface presses against the film to bring this into contact with a film conveying surface on said cartridge.
December 24, 1974
Date of Patent:
December 7, 1976
VEB Pentacon Dresden
Werner Hahn, Walter Hennig, Bernhard Walther
Abstract: A tubular member of predetermined length is arranged in an ornamental fasion, such as a helix disposed in conical or cylindrical configuration or as a festooned member, and is adapted to contain a first fluid, such as water, and to receive a second fluid, such as air, which is lighter than water and which passes through the first fluid in pockets separated one from the other. Seat defining means are carried by the tubular member as either a continuous or discontinuous strip and so as to receive illumination means which when illuminated coacts with the first fluid and the second fluid, as it passes through the first fluid, to provide a pleasingly aesthetic effect. A conduit member may also be carried by said tubular member to act as a return for the second fluid; and suitable pump means are provided to inject said second fluid into said first fluid. If desired particles of reflecting material may be dispersed in said first fluid.
Abstract: An automatic exposure time control circuit for use with a camera having a shutter. A light measuring circuit for measuring the scene brightness passing through the camera lens produces an electric signal proportional to the logarithm of the scene brightness. An A-D converter circuit converts the output signal from the light measuring circuit to a digital signal. A first decoder, having a plurality of output terminals, receives the converted, digital signal and produces an output at a corresponding one of the output terminals. An exposure time control circuit, comprising a binary counter having the same number of stages and output terminals as the number of output terminals of the first decoder is set to the output of the decoder upon release of the shutter.
Abstract: A system is disclosed for measuring the background density of an object to be photographed wherein a count is inserted into a counter proportional to the measured density. The intensity of illumination of the object is thereafter measured and the count within the counter is counted down at a rate proportional to the measured illumination intensity until the count reaches zero; the beginning of the exposure interval being defined by the start of the countdown step and the end of the interval being defined by the count in the counter reaching a predetermined value.
Abstract: A shutter control circuit for a camera including a timing circuit for measuring the exposure time during which the shutter will remain open. The shutter control circuit further includes a switching circuit having a switching transistor with a collector, coupled to the timing circuit, an emitter and a base. A first constant voltage source is connected to the emitter of the switching transistor. A manual exposure control circuit includes an emitter follower circuit with a transistor complementary to the switching transistor. A second constant voltage source is also included in the manual exposure control circuit and is coupled to the emitter follower circuit. The voltage level of the second constant voltage source is capable of being manually set in accordance with the desired shutter time. The output of the emitter follower circuit is coupled to the base of the switching transistor.
Abstract: This invention relates to a reflex camera device having a single lens for the photography of right and left images from an object space transmitted as first and second light ray bundles from two positions separated by an interocular distance onto a single frame of a single film strip; a first set of mutually extinguishing filters such as polarizers, one filter of the set along each of the first and second light ray bundles; a single frame aperture; a second set of mutually extinguishing filters near the image plane to separate the first and second light ray bundles from each position respectively into right and left adjacent images onto the single frame; means to control convergence, focus and interocular distance; and a reflex viewer containing a third set of mutually extingusihing filters to enable the simultaneous viewing and photographing of right and left adjacent images. SUThis invention relates to a reflex camera device for 3-dimensional photography.
Abstract: A novel electronic timing apparatus is described which contains means for selecting a preset time interval and means for selecting an actual interval to be timed which is equal to or less than, and also a function of, the preset interval. When the apparatus begins timing an actual interval, a first energy source is activated and a second energy source is deactivated. When timing of the actual interval is completed, the first energy source is deactivated and the second energy source is activated. The appartus is powered by a power supply means which furnishes a regulated direct current to integrated circuits requiring such and furnishes line frequency current to other circuits. It also contains means for generating and shaping periodic pulses from line frequency current to form an electronic time base signal for its operation.
Abstract: This invention is directed to a photographic camera having a slit shutter which utilizes two cover systems which operate above the plane of the image. These systems are movable perpendicularly to the direction of movement of the film within the camera. Each cover system comprises displaceable segments movable relative to each other. These can be brought into and out of overlapping position at a corresponding opposed end of the image window. When open, they extend across the window to cover the window, and when closed they recede into overlapping position to uncover the window. While broadly speaking, the so-called "slit shutter" type of shutter has been used, the herein described proposal for providing the open and closed systems is unique.
May 28, 1975
Date of Patent:
October 26, 1976
Prontor-Werk, Alfred Gauthier GmbH
Waldemar T. Rentschler, Franz W. R. Starp
Abstract: An automatic diaphragm control for camera lenses having independent diaphragm and shutter speed rings in which a reversible motor is positioned to drive the diaphragm ring, and a gear engaging the diaphragm ring drives a potentiometer. A light-sensor is in circuit with the motor and the potentiometer to drive the diaphragm ring to cause the potentiometer to balance the light-sensor output. The position of the diaphragm ring and the potentiometer is adjustable for film speed and for the selected shutter speed.
Abstract: An automatic exposure control circuit comprises a pair of lamp circuits for displaying the fact that an automatic exposure is feasible and the exposure period which is automatically determined, as well as an electronic shutter circuit and an automatic shutter release circuit, and optionally a color temperature measuring circuit. The control circuit is associated with a photomicrographic apparatus which takes a picture of a specimen being observed in a microscope. When taking a picture, a photometry is made of light from a specimen being photographed in order to determine initially whether an automatic exposure control is feasible for the specimen, and if it is feasible, to provide an automatic release of an electronic shutter by means of a motor, thereby activating the electronic shutter and also producing a lamp display during the period when the electronic shutter is operating. Optionally, a color temperature of the light from a light source which is used to irradiate the specimen is measured.
Abstract: A leading blind and a trailing blind are made of rigid material such as metal sheet and each is provided with at least one permanent magnet. Along the path of the blinds are arranged electromagnetic coils. Each magnet mounted on the blind has a brush which is in slidable contact with the contacts connected with the electromagnetic coils. The magnet on the blind and the electromagnetic coils arranged in a line along the path of the blind constitute a linear motor to drive the blind. The coils are connected with an exposure control circuit and are energized to drive the blind. The leading blind is driven upon depression of a shutter release button and the trailing blind is driven when a time determined by the exposure control circuit has lapsed. In a preferred embodiment of the invention, the blind is divided into a driving blade and a follower blade to save the space occupied by the blind.
November 26, 1974
Date of Patent:
October 19, 1976
Toshihiro Kondo, Fuji Photo Film Co., Ltd.
Abstract: An apparatus for activating an electronic flash by operating an X contact when the first blind of a focal plane shutter has terminated its movement to fully open an exposure light path, irrespective of an exposure period establishing operation. Where an electronic focal plane shutter is combined with an auto-strobo, a photometric circuit within the electronic circuit is used to measure the radiation from the auto-strobo, and to control the amount of exposure to a proper value. Where a proper amount of exposure is available by natural light when the shutter is opened, a closing movement of the shutter is utilized to cause the trigger capacitor of the electronic flash to be discharged, thereby disabling the illumination of the electronic flash.
Abstract: A movie camera of the kind adapted for simultaneous motion picture and magnetic sound recording on a film in a cartridge, in which sound recording means including a magnetic recording head and a capstan are disposed in the camera body, and a swingable lever carrying sound recording means including a pinch roller is disposed in the camera body to be held in a retracted position when the cover of the camera is fully opened and kept in such position for the loading and unloading of the cartridge. In the movie camera, means are provided so that the pinch roller carried by the swingable lever can be urged to a position closely adjacent to the capstan and held temporarily in such position when the cartridge is loaded and the cover is closed, and then the pinch roller can be urged further toward the capstan to bring the sound recording track portion of the film into pressure contact with the capstan in response to the manipulation of the release for starting the motion picture taking operation.
Abstract: An electric eye exposure apparatus includes an exposure meter interlocked with drive means and a switching mechanism for selectively connecting the drive means either to a shutter blade operating mechanism or to a diaphragm aperture control mechanism. The drive means further cooperates with a shutter speed governor. The exposure apparatus permits control of both the diaphragm aperture and shutter speed to be selected between at least two of a variety of optional exposure procedures including electric eye exposures of a programmed type, an electric-eye followed shutter speed type, an electric-eye followed diaphragm opening type, as well as an exposure of a manually-selected shutter speed and diaphragm opening type.