Patents Examined by Russell E. Adams, Jr.
  • Patent number: 4010479
    Abstract: Focusing apparatus for use in optical systems, such as photographing cameras, is disclosed. The focusing apparatus of the invention comprises an electronic system for developing, through either a single or two separate channels, pulse trains, the number of pulses contained in the pulse trains being related to the brightness of the image forming light received by the optical system as focused on photoconductive elements. The electronic system further includes a comparing subsystem for comparing the number of pulses included in the two pulse trains and, in accordance therewith, generating an information output signal related to the focus state of the optical system. Alternatively, the output signal may control a drive system adapted to move the imaging lens portion of the optical system toward focus.
    Type: Grant
    Filed: June 30, 1975
    Date of Patent: March 1, 1977
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventor: Tsukumo Nobusawa
  • Patent number: 4009959
    Abstract: A programmable exposure control device for use on a photographic film printer for producing special effects in motion pictures such as a fade-in, fade-out, lap dissolve or other numerous special effects requiring variations in printing beam intensity. The exposure control device comprises a mechanical shutter capable of progressively varying the intensity of the printing beam at any predetermined rate. A control system is provided for operating the shutter and includes a memory portion for storing preselected operating curves for a plurality of film exposure characteristics. The control unit is connected to a tape reader for supplying information to the control unit, for example, relating to the length of the particular fade desired. The tape reader also may provide information for controlling the position at which a fade or other special effect is to begin or end.
    Type: Grant
    Filed: June 26, 1975
    Date of Patent: March 1, 1977
    Assignee: Bell & Howell Company
    Inventors: Charles J. Watson, Larry L. Langrehr, John H. Steiner
  • Patent number: 4008481
    Abstract: An exposure control system is provided with means through which it is automatically actuated to change the exposure controlling characteristics thereof in response to the coupling of a source of artificial illumination therewith. The exposure control system is operable in both an ambient and flash mode of operation wherein the exposure control system anticipates a rather large shutter blade overshoot subsequent to the command signal to close the shutter blades during the ambient mode of operation which anticipation is automatically compensated for during the flash mode of operation to provide an optimum flash mode exposure interval prior to receipt of the command signal to close the shutter blade elements.
    Type: Grant
    Filed: October 3, 1975
    Date of Patent: February 15, 1977
    Assignee: Polaroid Corporation
    Inventor: George D. Whiteside
  • Patent number: 4007468
    Abstract: An optical trim mechanism is provided for embodiment in the exposure control system of a photographic camera apparatus wherein the output response of the exposure control system is determined by both the photographic scene light reaching the photographic camera as well as the focused distance from the photographic camera to the subject to be photographed. The trim mechanism provides the photographer with a degree of overriding personal control through which he may simultaneously vary the amount of scene light reaching the exposure control system while at the same time varying the output response of the exposure control system as determined by the focused distance from camera to subject.
    Type: Grant
    Filed: March 3, 1975
    Date of Patent: February 8, 1977
    Assignee: Polaroid Corporation
    Inventors: Igor Blinow, Bruce K. Johnson, George D. Whiteside
  • Patent number: 4007466
    Abstract: An electrical system to be used for photographic purposes. The electrical system has an input circuit for providing a given input signal as well as an output circuit for utilizing the latter signal and an intermediate circuit electrically connected between the input and output circuits for controlling the transmission of the input signal to the output circuit. The input circuit includes a photoelectric converter in the form of a semiconductor which receives light and which has an open-circuit voltage which varies in the manner of a logarithmic compression depending upon the intensity of the received light so that the input signal is determined at least in part by the nature of the light received by the photoelectric converter. The intermediate circuit is electrically connected with the input circuit for providing for the latter a stabilized circuit condition in which the photoelectric converter is in a stabilized state where no current flows therethrough.
    Type: Grant
    Filed: February 3, 1975
    Date of Patent: February 8, 1977
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventor: Seinan Miyakawa
  • Patent number: 4007467
    Abstract: A light-sensitive element is connected to a capacitor to vary the charging rate of the capacitor in accordance with the light falling on the light-sensitive element. The emitter-collector circuit of a switching transistor is connected in series with the light-sensitive element. The base of the transistor is pulsed by an astable multivibrator which furnishes a pulse sequence having a pulse repetition rate which exceeds the reciprocal of the smallest exposure time. The pulses in the pulse sequence have a pulse width determined by the selected one of a plurality of resistors. The selector switch inserting the selected one of the resistors into the astable multivibrator circuit is coupled to selector means which select one of a plurality of exposure factors as for example the aperture size. The electronic switch is conductive, permitting charging of the capacitor only during the pulse duration. The charging rate of the capacitor can therefore be adapted to the particular aperture size, film sensitivity, etc.
    Type: Grant
    Filed: July 15, 1975
    Date of Patent: February 8, 1977
    Assignee: AGFA-Gevaert, A.G.
    Inventors: Eduard Wagensonner, Kurt Borowski, Dieter Knauer
  • Patent number: 4006975
    Abstract: Pressing of the camera release button causes start of the film transport and automatic setting of the diaphragm for a normal exposure. When fade-over switch is closed, a forward-reverse counter is started. When the count on the counter reaches 31, a first AND-gate switches a first JK flip-flop to a second state wherein an additional resistor is inserted in the normally balanced diaphragm control circuit thereby unbalancing same and causing the closing of the diaphragm to commence. When the count on the counter reaches 63, another AND-gate switches additional JK flip-flops for reversing both the film transport and the counting direction of the counter. When the counter has counted down to a predetermined number, further logic circuits cause a stoppage of the film transport and stopping and resetting of the counter so that reactivation of the release button automatically starts the fade-in.
    Type: Grant
    Filed: July 23, 1975
    Date of Patent: February 8, 1977
    Assignee: AGFA-Gevaert, A.G.
    Inventors: Eduard Wagensonner, Alfred Winkler
  • Patent number: 4006354
    Abstract: A low-profile lighting fixture particularly suitable for low and medium height mounting installations. The lighting fixture includes a housing assembly comprising a base member and first and second end sections at opposite ends of the base member. The first and second end sections respectively contain a power supply ballast transformer and capacitor for the fixture. An upstanding bracket supporting a horizontally-oriented lamp-receiving socket is attached to the base member intermediate to the first and second end sections, and a generally-rectangular reflector having an opening therein is mounted to the base member in line with and intermediate to the first and second end sections with the lamp-receiving socket extending horizontally into the interior of the reflector via the opening in the reflector.
    Type: Grant
    Filed: July 9, 1975
    Date of Patent: February 1, 1977
    Assignee: GTE Sylvania Incorporated
    Inventors: Hendrik A. J. deVos, Thomas W. Carvalho
  • Patent number: 4006484
    Abstract: A camera having a digitally operating structure for determining exposure time according to a digital value corresponding to the light intensity. The camera also has an adjustable diaphragm. The latter is adjusted in accordance with the difference between the digital value used for determining the exposure time and the actual value of the light intensity where the latter does not coincide with the digital value for the exposure time, so as to increase the precision of the exposure.
    Type: Grant
    Filed: May 27, 1975
    Date of Patent: February 1, 1977
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventor: Tsukumo Nobusawa
  • Patent number: 4005443
    Abstract: A device for automatically focusing an image in an optical system such as a camera wherein a photosensitive array having a plurality of discrete sites is positioned in the focal plane of the optical system to dissect the image into segments and determine the light intensity at each segment. Means are interposed in the focal plane to vary the focus of the image, the illumination of the photosensitive array being dependent on the degree of focus of the image. The discrete sites have a charge produced thereon depending on the degree of illumination. Address means scan the photosensitive array and read out the charges on the discrete sites to form a pulse train. Discrimination means are connected to the address means to determine when the frequency of the pulse train is maximized to indicate sharp focusing of the image, as the focus of the image is varied.
    Type: Grant
    Filed: September 11, 1975
    Date of Patent: January 25, 1977
    Inventor: Fritz Albrecht
  • Patent number: 4005444
    Abstract: A photographic flash exposure control system for a camera associated with a flash device. In conformance with a preselected shutter interval, an effective exposure aperture of a diaphragm device is computed by a computing circuit of the system. The total flash energy available from the flash device is automatically controlled in accordance with the luminance of the subject being photographed, to thereby provide correct exposure for complex lighting situations.
    Type: Grant
    Filed: July 15, 1974
    Date of Patent: January 25, 1977
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Uchiyama, Yukio Mashimo, Tetsuya Taguchi, Zenzo Nakamura
  • Patent number: 4005445
    Abstract: A diaphragm of a camera is controlled by a servomotor which is actuated with an output of an amplifier. A bridge circuit including a photodetector which receives light from the object to be photographed is connected with the amplifier so that the imbalance output of the bridge circuit may be amplified by the amplifier and transmitted to the servomotor to actuate the motor in accordance with the imbalance of the bridge circuit. The output of the photodetector is differentiated by a differentiation circuit connected between the photodetector and the amplifier so that the output of the amplifier may be controlled by the differentiated output which represents the rate of variation in the quantity of light received by the photodetector.
    Type: Grant
    Filed: February 15, 1974
    Date of Patent: January 25, 1977
    Assignee: Fuji Photo Optical Co., Ltd.
    Inventor: Kunio Ando
  • Patent number: 4004145
    Abstract: A transparent prismatic low luminance lighting panel having on the outer or light-emissive surface thereof a plurality of refracting prismatic elements in the form of partially spherical domes overlapping one another and arranged in orthogonal rows and columns parallel to the length and width of the panel. The upper or light-incident surface of the panel has integral therewith a plurality of raised square-shape portions at positions opposite the square bases of the prismatic elements, or a plurality of longitudinal raised portions at positions opposite to the columns of the square bases. The upper surfaces of the raised portions are covered by a coating of an opaque material which stops and reflects any undesirable luminous rays falling thereon.
    Type: Grant
    Filed: February 24, 1975
    Date of Patent: January 18, 1977
    Inventor: Ignacio Goytisolo Taltavull
  • Patent number: 4003065
    Abstract: A flash device having a plurality of flashbulbs which operate sequentially by the use of time delay circuits to produce a longer duration of flashlight. Light reducing filters are used adjacent the flashbulbs to reduce the light intensity of the flashbulbs to obtain a more uniform light intensity during the length of the flash of all the flashbulbs, especially in the areas of overlapping of light intensity between adjacent sequential flashbulbs. A second embodiment modifies the light intensity by the placement of the flashbulbs in relation to the optical axis of the reflecting mirror.
    Type: Grant
    Filed: October 17, 1975
    Date of Patent: January 11, 1977
    Inventor: Kiyoshi Chikashige
  • Patent number: 4001571
    Abstract: An improved system for lighting a floor area in a building. A plurality of lighting fixtures mounted in a ceiling structure for lighting the floor area are connected in one or more branch circuits. Each branch circuit is defined by a plurality of plural conductor branch circuit cables which distribute power to the fixtures. Each cable connects in series or parallel to both the next cable and the next fixture in the branch circuit. Circuit connections are easily modified for changing power distribution and switching needs by selective insertion of adapters between two series connected cables or between a cable and a connected fixture. Adapters provide for switching circuits and for converting circuit connections.
    Type: Grant
    Filed: July 26, 1974
    Date of Patent: January 4, 1977
    Assignee: National Service Industries, Inc.
    Inventor: Myron D. Martin
  • Patent number: 4001843
    Abstract: A control system for a camera which automatically carries out an involved photographic cycle in response to the momentary depression of a start button. Under select low light level conditions, the automatic carrying out of the cycle is deferred for an operator light evaluation interval amounting to about 5 seconds. Should the operator determine to make a time exposure, the start button is depressed again to cause the camera to carry out a time exposure. An indicator arrangement may be supplied for apprising the operator of low light level conditions.
    Type: Grant
    Filed: July 29, 1974
    Date of Patent: January 4, 1977
    Assignee: Polaroid Corporation
    Inventor: Seymour Ellin
  • Patent number: 4001846
    Abstract: Several improvements are disclosed for a system which automatically photographically records information such as the aperture and shutter speed settings of a photographic camera on film negatives as they are exposed. The improvements include a light diffusing aperture structure for use with light emitting diode displays and several embodiments and structural features of selector switches which are used to control the light emitting diode displays. An electrical circuit is also disclosed illustrating the manner in which the various components of the present invention are combined and function in cooperation with a photographic camera.
    Type: Grant
    Filed: August 9, 1974
    Date of Patent: January 4, 1977
    Inventor: John J. Kauneckas
  • Patent number: 4001576
    Abstract: A lamp shade structure for utilization with a conventional illuminating lamp which includes a support base and a lamp illuminating means. The shade is adapted to be utilized with conventional tungsten filament lamp radiation, and comprises a lamp enclosing shade comprising a film having a metallized coating applied to one surface thereof, the film transmitting from between about 2% to 8% of incident tungsten filament lamp radiation, and reflects the balance of from about 92% to 98%, of which a portion of the reflected light is in turn transmitted to the viewer. Unusual reflective and interference patterns are generated from the combination, with these patterns extending axially through the open ends of the lamp enclosing shade.
    Type: Grant
    Filed: August 25, 1975
    Date of Patent: January 4, 1977
    Inventor: Stephen A. A. Goddard
  • Patent number: 4000496
    Abstract: A filming camera having a synchronous sound recording of the type in which the film is driven by a claw undergoing a reciprocating movement produced by a motor and, downstream of the claw, by a capstan driven by a second motor, wherein the claw motor has a constant speed and the capstan motor speed is variable and means are provided to make the average speed of said capstan motor a determined function of the claw motor speed.
    Type: Grant
    Filed: January 9, 1975
    Date of Patent: December 28, 1976
    Assignee: Beaulieu S.A.
    Inventor: Marcel Beaulieu
  • Patent number: 3999842
    Abstract: A method and apparatus for the resynchronization of the transport of movie film (image carrier) with the movement of another information-carrying medium such as sound tape film. Speed control and synchronization signals are produced by means of sensing the sound tape movement which provides control synchronization signal, monitoring the image frames for each sequence on the movie film by means of a counter, and comparing in a coincidence circuit the image frame count signal with the signal from the sound tape. Desynchronization of the movie film and tape is indicated by the absence of a predetermined relationship between the number of image frames in a given sequence and the signal from the sound tape, whereupon the coincidence circuit energizes an appropriate control means via a switching mechanism, such as a gate circuit, which produces a resynchronization of the film and the sound tape.
    Type: Grant
    Filed: August 26, 1974
    Date of Patent: December 28, 1976
    Assignee: Bolex International SA
    Inventors: Marc Niederhauser, Claude Kreienbuhl