Patents by Inventor Shigeo Tokunaga

Shigeo Tokunaga 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: 5552929
    Abstract: A stereomicroscope includes an objective optical system, a variable magnification optical system, and a plurality of imaging optical systems, in which the plurality of imaging optical systems can be moved in a plane perpendicular to the optical axis of the variable magnification optical system. Thus, the stereomicroscope has the advantage that where one of two observers wishes to observe a brighter image, the amount of light can be adjusted, without replacement of a light source, by moving the imaging optical systems.
    Type: Grant
    Filed: March 28, 1995
    Date of Patent: September 3, 1996
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Takashi Fukaya, Masami Hamada, Shinichi Nakamura, Toyoharu Hanzawa, Masahiko Kinukawa, Tomonori Ishikawa, Hiroshi Fujiwara, Shigeo Tokunaga
  • Patent number: 5273039
    Abstract: A surgical microscope apparatus is equipped with movable member of a multi-articulation mechanism capable of moving a microscope in three dimensions. A plurality of detecting devices detect the moving directions and displacement distances of the movable members and a focusing device. A processing device calculates coordinates of an observation point relative to a standard point (an affected part of a patient) on the basis of detection signals provided from these detecting devices. An indicating device displays the coordinates of the observation point within an observation visual field of the surgical microscope. Furthermore, the plurality of detecting devices may be equipped to drive each of the movable members and the focusing device. The surgical microscope apparatus can then be moved to desired positions by driving each of the movable members and the focusing device with the detecting/driving devices.
    Type: Grant
    Filed: November 17, 1992
    Date of Patent: December 28, 1993
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Hiroshi Fujiwara, Shigeo Tokunaga
  • Patent number: 5227914
    Abstract: A stereomicroscope is equipped with an objective lens, a variable magnification optical system having an optical axis common with that of the objective lens, a splitting optical system splitting emergent light from the variable magnification optical system into a plurality of optical paths, and an eyepiece disposed in at least one of the optical paths, having a diameter larger than the interpupil distance of an observer. Thus, the stereomicroscope has advantages that, with a simple structure and easy adjustment, many people can make observations, the mountings of photographic and TV devices are possible, the directions in which plural observers see through the microscope can be changed, and eyestrain is difficult to occur which may be caused by the difference in magnification between the images of a bilateral observation optical system.
    Type: Grant
    Filed: July 12, 1991
    Date of Patent: July 13, 1993
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Toyoharu Hanzawa, Tomonori Ishikawa, Shinichi Nakamura, Hiroshi Fujiwara, Masahiko Kinukawa, Kimihiko Nishioka, Masami Hamada, Takashi Fukaya, Shigeo Tokunaga, Yoshihiro Kawano, Masaaki Yamagishi
  • Patent number: 5122904
    Abstract: The operating microscope comprises at least one suction port formed in a microscope body or an arm for supporting the microscope body which is to be enveloped in a drape, and an exhaust fan or exhaust pump connected to the suction port. An exhaust port to be connected to an exhaust pump may be formed in the drape. Since air is exhausted out of the drape, and the drape is brought into close contact with the microscope body and the arm by operating the exhaust fan or the exhaust pump, the drape does not constitute a hindrance in the visual field of a surgeon or dgrade operability of the microscope.
    Type: Grant
    Filed: October 22, 1990
    Date of Patent: June 16, 1992
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Hiroshi Fujiwara, Masami Hamada, Shigeo Tokunaga, Masahiko Kinukawa, Tomonori Ishikawa, Takashi Fukaya, Masanori Kaneda, Kenji Yoshino, Tadao Hagino
  • Patent number: 5048941
    Abstract: The surgical microscope comprises a stand, an arm movably attached to said stand for sustaining a microscope body, an electric control equipment divided into a plural number of units removably piled up on said stand and a foot switch unit to be used for executing various types of functions. Accommodated in each unit are a function control means having a single specific function or plural specific functions different from those of the other units and an independent power source means connected to said function control means in a relation of 1:1 or in a different combination. The surgical microscope can be designed compact as a whole, has high operability and assures high security during operation. Should a function be lost due to troubles during operation, the surgical microscope prevents the other functions from being influenced by the troubles and allows to speedily restore the lost function.
    Type: Grant
    Filed: October 5, 1989
    Date of Patent: September 17, 1991
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Masami Hamada, Hiroshi Fujiwara, Kosaku Tsuboshima, Masahiko Kinukawa, Toshiyuki Tsunoda, Takashi Nagano, Kazyuki Minami, Shigeo Tokunaga, Masanori Kaneda, Tomonori Ishikawa
  • Patent number: 5000780
    Abstract: Disclosed is a fragrance emitting metal composed of a sintered metallic body prepared by press-molding a metal powder for sintering within a mold having a required shape, followed by sintering of the resulting molded product at a required temperature, characterized by the constitution wherein the molding pressure is controlled so that the resulting sintered product may have a porosity which permits infiltration of a liquid perfumery therethrough; and the surface of the sintered metallic body is partially polished so as to reduce the porosity of the polished surface, thereby improving the property of sustaining the diffusion of the fragrance from the liquid perfumery infiltrated therethrough and also to impart gloss and luster thereto.
    Type: Grant
    Filed: June 16, 1988
    Date of Patent: March 19, 1991
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventor: Shigeo Tokunaga
  • Patent number: 4891002
    Abstract: A product ejector in a motor-driven, direct-acting type hydraulic mold clamping system, which includes a rod mounted on a ball screw for driving a moving platen at a forward end of the screw on the side of the platen, so that the rod is immovable axially and engageable with and disengageable from an ejector plate attached to an ejector bar slidably arranged within a bore in the platen. When the platen moves rearwardly, the ejector plate, moving together with the platen, is abutted against the rod. As the platen moves farther rearwardly, the rod causes the ejector bar to project into a mold mounted to the platen, against the force of a spring inteposed between the ejector plate and the platen, to eject a molded article.
    Type: Grant
    Filed: April 15, 1988
    Date of Patent: January 2, 1990
    Assignee: Fanuc Ltd.
    Inventors: Yoshiharu Inaba, Shigeo Tokunaga
  • Patent number: 4877388
    Abstract: A mold clamping apparatus having a plurality of servomotors for drivingly rotating a ball screw as a spindle. A driven timing gear pulley is mounted on a ball nut threadedly engaged with the ball screw whereby the pulley is rotatable integrally with the nut, and driving timing gear pulleys are fixed to output shafts of the respective motors. A timing belt is wound between the driven and driving pulleys. The servomotors are driven so as to produce the same torque by means of driving circuits which respond to the same torque command generated in accordance with a signal representative of a rotational position of one of the servomotors.
    Type: Grant
    Filed: March 8, 1988
    Date of Patent: October 31, 1989
    Assignee: Fanuc Ltd.
    Inventors: Yoshiharu Inaba, Shigeo Tokunaga
  • Patent number: 4865536
    Abstract: There is provided a direct mold clamping apparatus with an ejector, which is capable of uniformly applying a mold clamping force to a movable platen and is simple in construction and compact in size. A hollow cylindrical push member (12) and a movable platen (3) are coupled to each other through a single junction plane, in the form of an annular ring. A driving force transmitted through the push member is applied uniformly to the movable platen. The ejector (1) of the mold clamping apparatus (2) is provided with a ball nut (7) disposed in a hollow portion of the push member. A ball screw (6), which mates with the nut, is coaxial with a ball screw (8) for mold clamping, and has a front end fixed to an ejector pin (4) and the rear end portion removably fitted in a hole (8a) in a front end portion of the mold clamping ball screw. Thus, the axial length of the mold clamping apparatus is reduced.
    Type: Grant
    Filed: June 17, 1988
    Date of Patent: September 12, 1989
    Assignee: Fanuc Ltd.
    Inventors: Yoshiharu Inaba, Fumio Mitoguchi, Shigeo Tokunaga
  • Patent number: 4828476
    Abstract: A direct-pressure type mold clamping apparatus of an injection-molding machine, capable of performing high-speed mold closing and opening operations and of producing a required mold clamping force, without the use of a large-sized motor, is driven by two motors. The mold clamping apparatus includes a ball screw (6) engaging a ball nut (7) which is movable in unison with a movable platen (1). The ball screw is coupled to a servomotor (10) through a transmission mechanism (8, 9, 11, 17), and is also coupled to an induction motor (12) through the transmission mechanism, a speed reducer (14), and a clutch (15). A numerical control unit (20) controls the servomotor, the induction motor, and the clutch. After the movable platen, drive by the servomotor, is moved at high speed to a die touch position, the movable platen is driven to a set mold clamping force producing position with a greater driving force, by both the servomotor and the induction motor.
    Type: Grant
    Filed: April 27, 1988
    Date of Patent: May 9, 1989
    Assignee: Fanuc Ltd
    Inventors: Inaba Yoshiharu, Fumio Mitoguchi, Masao Kamiguchi, Shigeo Tokunaga