Patents by Inventor Takayuki Tsuboi

Takayuki Tsuboi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4970537
    Abstract: A camera permitting close-up photography has a normal photographing mode and a close-up photographing mode. A flash device, a view finder device, a distance measuring device, a photo-taking lens drawing out device, etc. of the camera are arranged to automatically shift to a condition suited for the close-up photography in response to the switch-over of the normal photographing mode to the close-up photographing mode.
    Type: Grant
    Filed: October 18, 1989
    Date of Patent: November 13, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takayuki Tsuboi
  • Patent number: 4935764
    Abstract: A stepping drive unit for cameras which is capable of stepwise driving a photographic optical system by operating a member which is placed into a reciprocating motion by means of an electromagnetic force on a plane substantially parallel with the photographic optical axis and not through a cam, whereby the transmission efficiency of a drive cam is increased. The drive is also capable of eliminating the need to employ a stepping drive in returning the photographic optical system to an initial position whereby the number of steps taken by the stepping drive is reduced, and of conducting its functions without applying any excessive impulsive force by stepwise increasing the amount of electricity charged to the electromagnetic drive member as the number of steps taken by the stepping drive increases, whereby the level of mechanical driving sounds is greatly reduced.
    Type: Grant
    Filed: July 13, 1988
    Date of Patent: June 19, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventors: Isao Nakazawa, Takayuki Tsuboi, Yasuhik Shiomi
  • Patent number: 4870439
    Abstract: A focal length varying device for a camera comprises a photo taking optical system having a variable focal length; a discriminating device for discriminating whether or not adequate photographing is possible; and a system for automatically changing the focal length of the photo taking optical system on the basis of the result of discrimination made by the discriminating device.
    Type: Grant
    Filed: January 13, 1989
    Date of Patent: September 26, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takayuki Tsuboi, Isao Nakazawa, Hiroshi Maeno, Yasuhiko Shiomi
  • Patent number: 4862202
    Abstract: A magnification change-over device for a camera is provided with an incident optical path for the incidence of the light of an object to be photographed; a first optical path for guiding the object light incident on the incident optical path to a first aperture; a second optical path for guiding the object light incident on the incident optical path to a second aperture; changeover means for selection between the first and second optical paths; and optical means for differentiating the magnification of an image formed through the second aperture from that of an image formed through the first aperture.
    Type: Grant
    Filed: December 5, 1988
    Date of Patent: August 29, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takayuki Tsuboi, Isao Nakazawa, Yoshihiro Harunari, Yasuhisa Sato, Yasuyuki Yamada
  • Patent number: 4827303
    Abstract: In a distance measuring device for automatically detecting an object distance on the basis of triangulation by unidirectional optical scanning of a distance between the closest distance and infinity, a plurality of distance measuring points are set within an object range and are spread perpendicular to the distance measuring direction; and these distance measuring points are optically scanned concurrently with the above scanning operation.
    Type: Grant
    Filed: February 2, 1988
    Date of Patent: May 2, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takayuki Tsuboi
  • Patent number: 4811041
    Abstract: A magnification change-over device for a camera having a common incident optical path for having rays of light from an object impinge thereinto, a first optical path for guiding the rays of light from the object, impinging into the common incident optical path, to a first aperture, a second optical path for guiding the rays of light from the object, impinging into the common incident optical path, to a second aperture, a change-over device for selecting either the first aperture or the second aperture, and a wide converter for rendering magnification of an image formed at the second aperture different from a magnification of an image formed at the first aperture.
    Type: Grant
    Filed: April 11, 1988
    Date of Patent: March 7, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takayuki Tsuboi
  • Patent number: 4610523
    Abstract: An operation mechanism for a camera which performs sequential actions by engaging with and disengaging from an electromagnetic driving member moved by an electromagnetic force is arranged to be capable of disengaging from the electromagnetic driving member by its own operating force. Therefore, the electromagnetic driving member does not require any large magnetic force for the disengagement.
    Type: Grant
    Filed: March 12, 1985
    Date of Patent: September 9, 1986
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takayuki Tsuboi
  • Patent number: 4595268
    Abstract: A lens protection cover is contained within a barrel ahead of the objective lens, and opening and closing of this lens protection cover is performed by an actuator operable along the periphery of the lens barrel, whereby it is possible not only to protect the objective lens when not in use, but also to permit camera operation to be controlled by the open and closed positions of the lens projection cover so that faulty operation is prevented.
    Type: Grant
    Filed: September 17, 1985
    Date of Patent: June 17, 1986
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takayuki Tsuboi
  • Patent number: 4457604
    Abstract: A lens protection cover is contained within a barrel ahead of the objective lens, and opening and closing of this lens protection cover is performed by an actuator operable along the periphery of the lens barrel, whereby it is possible not only to protect the objective lens when not in use, but also to permit camera operation to be controlled by the open and closed positions of the lens projection cover so that faulty operation is prevented.
    Type: Grant
    Filed: February 23, 1982
    Date of Patent: July 3, 1984
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takayuki Tsuboi
  • Patent number: 4410253
    Abstract: Provided in the interior of a camera are an automatic focus adjusting mechanism which initiates a rearward motion from a position for focusing on an object at short distances to a position for focusing on an infinitely distant object when a distance adjusting member is released from the latching connection in the charged position against a bias force in response to actuation of a camera release, a protection cover arranged to shutter the front of a photographic objective lens when not in use, and an electric motor for charging the distance adjusting member. When a control knob for the protection cover is actuated, as the energized motor charges the distance adjusting member, the protection cover is caused to open.
    Type: Grant
    Filed: May 21, 1982
    Date of Patent: October 18, 1983
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takayuki Tsuboi
  • Patent number: D291090
    Type: Grant
    Filed: April 22, 1985
    Date of Patent: July 28, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Nobuhiro Ago, Takayuki Tsuboi
  • Patent number: D291579
    Type: Grant
    Filed: April 22, 1985
    Date of Patent: August 25, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hitomi Ito, Takayuki Tsuboi
  • Patent number: D311016
    Type: Grant
    Filed: December 1, 1987
    Date of Patent: October 2, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventors: Noboru Tanaka, Takayuki Tsuboi