Patents Assigned to Nihon Beru-Haueru Kabushiki Kaisha
  • Patent number: 4233503
    Abstract: A system and method for automatically focusing a camera is disclosed wher the outputs of a conventional spatial image correlator are sensed to develop a distance signal corresponding to object distance. The position of the camera lens is sensed to develop a focus signal indicative of lens position. The ratio of the distance signal to the focus signal is determined and compared to a predetermined value. When that ratio varies from the predetermined value, the lens is automatically re-positioned until correspondence occurs between the predetermined value and the ratio of the focus signal to the distance signal.
    Type: Grant
    Filed: March 5, 1979
    Date of Patent: November 11, 1980
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha (Bell & Howell Japan, Ltd.)
    Inventor: Koji Saito
  • Patent number: 4191882
    Abstract: An automatic focus adjusting device for use with an optical instrument hag a focusable objective lens which is adjusted by optical and electronic components of the instrument, such components determining the distance of an object by comparing images of separate scanning and reference optical systems. The device of the present invention has a low-reduction filter screen placed across part of each light path of the two optical systems. The filters provide an overriding apparent contrast to low-contrast object fields to cause the system to adopt a pre-set focus distance, but do not interfere with normal automatic focusing where object field contrast is adequate for normal system operation. Manual adjustment of the filter spacing varies the pre-set, low-contrast focus to any desired object distance setting. Five to ten percent light reduction in the screened part of each filter is adequate.
    Type: Grant
    Filed: July 18, 1978
    Date of Patent: March 4, 1980
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha (Bell & Howell Japan, Ltd.)
    Inventor: Hideharu Sato
  • Patent number: 4183640
    Abstract: A rangefinder mechanism is shown in which the scanning mirror has been replaced with a movable scanning optic. The automatic rangefinder system includes a pair of optical paths, one a reference path and the other a scanned path, which are lead to impinge upon a photosensitive surface for comparison purposes. The output of the photosensitive surface is used to adjust the main lens of the camera. The range of the movable optic is coordinated with the position of the main lens of the camera as feedback and adjustment of the rangefinder.
    Type: Grant
    Filed: January 23, 1978
    Date of Patent: January 15, 1980
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha
    Inventor: Masao Abe
  • Patent number: 4174892
    Abstract: A method and apparatus for automatically focusing a camera is described in which the camera has a stationary optical path and a scanning optical path for developing focusing signals. The scanning optical path is caused to undergo a range-finding reciprocation in which it reciprocates between first and second limit positions, as between the minimum lens focusing position and the infinite lens focusing position. Two focusing signals are generated during the range-finding reciprocation and the interval between the focusing signals is used to derive the distance to the subject. The lens is then positioned in accordance with the derived distance to the subject.
    Type: Grant
    Filed: July 6, 1978
    Date of Patent: November 20, 1979
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha
    Inventor: Noriaki Osawa
  • Patent number: 4171890
    Abstract: Disclosed is a reflex rangefinder system for a camera having a pair of li reflecting members mounted to reflect light rays from the scene in the viewfinder system. The members are dichroically coated with different complementary colors such that the dual image formed when the objective lens is out of focus have different colors to enhance the distinction for easy focusing.
    Type: Grant
    Filed: December 27, 1977
    Date of Patent: October 23, 1979
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha (Bell & Howell Japan, Ltd.)
    Inventors: Yoshiaki Mizuki, Michiharu Suwa
  • Patent number: 4162123
    Abstract: A technique is shown for automatically adjusting the sensitivity of an auto focus device in accordance with the level of light intensity of the subject. Sensitivity correction is required because the timing of the automatic focus signal is directly related to the intensity of the light from the subject. In systems where the timing of the automatic focus signal is used to determine the distance of the subject from the camera signal, correction is absolutely essential. A supplementary photo cell is used to measure the light coming from the subject and set the sensitivity of the automatic focus system.
    Type: Grant
    Filed: November 29, 1977
    Date of Patent: July 24, 1979
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha
    Inventor: Tadao Isono
  • Patent number: 4159868
    Abstract: A film loop size control is described for use in a camera in which the film s advanced intermittently past an image recording station by a first drive means and advanced continuously past a sound recording station by a second drive means. A detector which senses the size of the film loop between the image recording station and the sound recording station causes a control means to actuate only the second drive means whenever the detector senses a slack film loop when the film is stationary. The second drive means then advances the film past the sound recording station to remove the slack from the film loop. When the detector senses an absence of slack in the film, the control means de-actuates the second drive means. A switch is included which is adapted to be actuated when the film slack has been reduced for actuating both the first and the second drive means for advancing the film past the image recording station and the sound recording station.
    Type: Grant
    Filed: July 3, 1978
    Date of Patent: July 3, 1979
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha (Bell & Howell Japan, Ltd.)
    Inventor: Kotaro Sano
  • Patent number: 4159169
    Abstract: Disclosed is an improvement in an automatic focusing system for use with an ptical instrument having a focusable objective which is adjustable in response to optical and electronic components of the system for determining object distance of a remote subject by comparing images of scanning and reference optical systems. The scanner of the optical system is driven oscillatably across an angle to detect a subject between infinity and the minimum focus condition of the objective lens. The present invention relates to improvements in an automatic focusing system for use with an optical instrument having a focusable objective. More particularly, the improvement relates to optically correcting the images transmitted via the optical system to overcome problems of asymmetry of image position and/or intensity.
    Type: Grant
    Filed: May 30, 1978
    Date of Patent: June 26, 1979
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha (Bell & Howell Japan, Ltd.)
    Inventor: Hideharu Sato
  • Patent number: 4157217
    Abstract: Disclosed is an improvement in an automatic focusing system for use with an optical instrument having a focusable objective which is adjustable in response to optical and electronic components of the system for determining object distance of a remote subject by comparing images of scanning and reference optical systems. The scanner of the optical system is driven oscillatably across an angle to detect a subject between infinity and the minimum focus condition of the objective lens. The scanner is adjustable in response to the focus condition of the lens for alignment of the angle scanned with the subject when the lens is in perfect focus by means of an electronic and mechanical interconnecting feedback between the lens focusing ring and the aiming device for the scanning system.The present invention relates to improvements in an automatic focusing system's for use with an optical instrument having a focusable objective.
    Type: Grant
    Filed: January 23, 1978
    Date of Patent: June 5, 1979
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha
    Inventor: Tadao Isono
  • Patent number: 4146316
    Abstract: Disclosed is an improvement in an automatic focusing system for use with an optical instrument having a focusable objective which is adjustable in response to optical and electronic components of the system for determining object distance of a remote subject by comparing images of scanning and reference optical systems. The scanner of the optical system is driven oscillatably across an angle to detect a subject between infinity and the minimum focus condition of the objective lens. The present invention relates to improvements in an automatic focusing system for use with an optical instrument having a focusable objective. More particularly, the improvement relates to driving the focusing system to a preset fixed focus setting when the system senses difficult conditions for focus detection as those having low contrast or complex subject matter.A warning device is included to be activated thereby cautioning the operator that the automatic focus system has reached its operational limit.
    Type: Grant
    Filed: April 20, 1978
    Date of Patent: March 27, 1979
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha
    Inventor: Noriaki Osawa
  • Patent number: 4143952
    Abstract: An aperture assembly is described for use in a motion picture camera, parularly a camera using film cartridges and requiring an aperture assembly with a very thin profile. The aperture assembly includes a thin metal base plate to provide strength for the assembly and for alignment of aperture components thereon. The aperture components include a thin molded aperture piece and a pair of thin molded cartridge alignment shoulders, all mounted on one side of the base plate. The base plate and the aperture piece both have aligned exposure windows through which the film is exposed and aligned slits for receiving a shuttle tooth for advancing the film. Each of the cartridge alignment shoulders has an internal groove communicating with a slit in the base plate for receiving a shuttle foot. A shuttle and a side tension member for use with the aperture assembly are also described.
    Type: Grant
    Filed: June 13, 1977
    Date of Patent: March 13, 1979
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha (Bell & Howell Japan, Ltd.)
    Inventors: Yukio Katahira, Toshiaki Morimoto
  • Patent number: 4142785
    Abstract: Disclosed is a circuit for automatically intermittently sensing adequate ient light conditions and adjusting a cine camera iris for same. The circuit includes an astable multi-vibrator for intermittent switching of power to a Cds cell. Under low light conditions the resistance of the cell becomes great enough to stop the oscillations of the multi-vibrator.
    Type: Grant
    Filed: December 13, 1977
    Date of Patent: March 6, 1979
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha (Bell & Howell Japan, Ltd.)
    Inventor: Seiichi Saito
  • Patent number: 4136939
    Abstract: An automatic rangefinding optical system for a camera includes optics conted for movement subject to the operative zooming main lens. The rangefinding system has an automatic focusing device which generates a pulse when separate objective images from two optical system paths coincide. Zooming the rangefinder along the two optical system paths gives more precise automatic focusing of the subject by optically modifying the objective images according to the zoom position of the main lens.
    Type: Grant
    Filed: October 3, 1977
    Date of Patent: January 30, 1979
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha (Bell & Howell Japan, Ltd.)
    Inventor: Masao Abe
  • Patent number: 4125847
    Abstract: A rangefinder mechanism is shown in which the scanning mirror has been reced with a movable scanning optic. The automatic rangefinder system includes a pair of optical paths one a reference path and the other a scanned path which are led to impinge upon a photosensitive surface for comparison purposes. The output of the photosensitive surface is used to adjust the main lens of the camera. Disposed in front of the movable optic is another optical movable relative thereto to coordinate with the position of the main lens of the camera as feedback and adjust the rangefinder system.
    Type: Grant
    Filed: October 3, 1977
    Date of Patent: November 14, 1978
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha (Bell & Howell Japan, Ltd.)
    Inventor: Masao Abe
  • Patent number: 4123765
    Abstract: Disclosed is an improvement in an automatic focusing system for use with an optical instrument having a focusable objective which is adjustable in response to optical and electrical components of the system determining object distance of a remote subject by comparing images of scanning and reference optical systems. The scanner of the optical system is driven oscillatably across an angle to detect a subject between infinity and the minimum focus condition of the objective lens. The scanner is adjustable in response to the focus condition of the lens whereby the bisector of the angle is aligned with the subject.
    Type: Grant
    Filed: April 21, 1977
    Date of Patent: October 31, 1978
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha
    Inventor: Tadao Isono
  • Patent number: 4101843
    Abstract: A sensitivity control circuit is described for use with a sound movie camera having an automatic sound level control circuit. In one embodiment, the automatic sound level control circuit includes a pair of cascaded amplifiers whose overall gain is controlled by the conduction of an active control element. The active control element has an input terminal which receives a control signal representative of the amplitude of the signal output of the cascaded amplifiers. To desensitize the automatic sound level control circuit to background noise, a voltage source and a variable impedance element are serially coupled to the control terminal of the active control element to provide a control current for selectably varying the conduction of the active control element. The gain of the cascaded amplifiers is thereby selectively controlled and the sensitivity of the automatic sound level control circuit is reduced.
    Type: Grant
    Filed: December 2, 1976
    Date of Patent: July 18, 1978
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha
    Inventor: Eiji Aoyama
  • Patent number: 4093365
    Abstract: For use in a sound motion picture camera adapted to handle both sound and lent film and having a driven capstan at the sound station thereof, the capstan drive motor is used to power a driven component of an automatic focusing system by which a focusable objective lens can be focused automatically on a remote subject. By a control switch, associated with the camera operation control member, either manual or automatic focusing modes can be selected, the automatic mode being further selectable as being continuous during film transport operation or limited to a period before film transport operation begins.
    Type: Grant
    Filed: March 28, 1977
    Date of Patent: June 6, 1978
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha (Bell & Howell Japan, Ltd.)
    Inventor: Tadao Isono
  • Patent number: 4090783
    Abstract: A pinch roller actuating device for a sound motion picture camera including portion connected to a rotatable pinch roller to maintain the roller out of and in engagement with a capstan responsive to a movable camera actuating member having a limiting stop which defines the maximum displacement of the actuating member. A spring member is provided to move the pinch roller into engagement with the capstan after the actuating member is displaced beyond its mid-point. A bracket is arranged to prevent movement by the spring when the stopper engages the connecting portion, and instantly engages the pinch roller with the capstan by being suddenly moved by the spring member when the connection between the stopper and the connecting portion is released.
    Type: Grant
    Filed: September 20, 1976
    Date of Patent: May 23, 1978
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha (Bell & Howell Japan, Ltd.)
    Inventor: Yoshiaki Mizuki
  • Patent number: 4070106
    Abstract: To eliminate the recording of undesirable sounds which can occur upon stang a sound motion picture camera in which sound is recorded simultaneously as the picture is recorded, a circuit shorting switch is installed in parallel with the sound recording head, and a film transport motor control switch is arranged to function opposite to the circuit shorting switch but in cooperation with that switch to stabilize the amplifier before film movement begins.
    Type: Grant
    Filed: April 13, 1976
    Date of Patent: January 24, 1978
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha (Bell & Howell Japan, Ltd.)
    Inventor: Fumio Saito
  • Patent number: RE30058
    Abstract: Disclosed for a sound motion picture camera is an improved shuttle speed trol device including a film loop sensor sensitive to slight variations in the film loop for causing the speed of the shuttle to be changed by a simple brake device utilizing powers of the drive motor whereby less force is required for sensing the size of the film loop to maintain picture-sound synchronization.
    Type: Grant
    Filed: September 22, 1977
    Date of Patent: July 31, 1979
    Assignee: Nihon Beru-Haueru Kabushiki Kaisha (Bell & Howell Japan, Ltd.)
    Inventor: Yukio Katahira