Patents Assigned to Kabushiki Kaisha Sankyo Seiki Seisakusho
  • Rotary polygon mirror type light deflecting system
    Patent number: 5666219
    Abstract: Rotary polygon mirror type light deflecting system having a labyrinth ring fixed to an end of a fixed shaft. An outer circumferential surface of a labyrinth ring is caused to confront an inner circumferential surface of a polygon mirror while interposing a small gap therebetween in a radial direction. Further, a lower portion of a circular hole of the polygon mirror is fitted with a cylindrical sleeve of a hub to fix the polygon mirror to the hub. The polygon mirror and the labyrinth ring are made of the same material, e.g., aluminum or an aluminum alloy. The small gap is made as small as possible.
    Type: Grant
    Filed: October 31, 1996
    Date of Patent: September 9, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Yutaka Ishizuka, Koichi Katakura
  • Rotary element driving device
    Patent number: 5663603
    Abstract: A disk drive device includes a device stand on which a spindle motor and a device control board are fixedly mounted. The device stand has a motor mounting section which is embossed so that the spindle motor is mounted on the motor mounting section. Fastening members are inserted into the mounting holes which are formed in a stator core and the motor mounting section in such a manner that they are aligned with one another so that, with the fastening members, the circuit board is held between the motor mounting section and the stator core, and the spindle motor is fixedly mounted on the device stand. The circuit board follows the surface of the motor mounting surface being held in close contact with the latter.
    Type: Grant
    Filed: December 8, 1995
    Date of Patent: September 2, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Hiroshi Sakashita, Eiji Arasaki
  • Rotary polygon mirror type light deflecting system
    Patent number: 5661588
    Abstract: A rotary polygon mirror type light deflecting system including a mirror, a hub, and a fixed shaft made of materials whose coefficients of linear expansion are equal to one another. A fixed shaft is erected integrally with a frame. Inner races of ball bearings are secured to the fixed shaft. A stator has a coil wound around a stator core formed contiguously with the frame. A drive magnet annularly surrounding the outer circumferential surface of the stator core and a yoke are fixed to a polygon mirror with a clamper and screws through a hub. The drive magnet, the yoke, and the hub are secured to the fixed shaft and made rotatable by the outer races of the ball bearings secured to the fixed shaft.
    Type: Grant
    Filed: September 1, 1995
    Date of Patent: August 26, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Yutaka Ishizuka, Koichi Katakura
  • Objective lens drive unit having shaped magnetic pieces for providing a restoring force
    Patent number: 5659525
    Abstract: An objective lens drive device includes an objective lens holder, a fixing member, drive coils mounted on one of the objective lens holder and the fixing member; magnets mounted on the other, the magnets positioned in a face-to-face relationship with the drive coils and supplied with an electric current so as to drive the lens holder in both a focusing and a tracking direction, the magnets are magnetized with polarization at least in the focusing direction; and magnetic pieces placed in the magnetic circuits of the magnets relating to a focusing direction, wherein a two-dimensional restoring force is generated in the focusing and tracking directions by the magnetic attraction acting on the magnetic pieces so that the objective lens is held at the neutral point, at least one end portion of the magnetic pieces in the polarizing direction is wider than the middle portion.
    Type: Grant
    Filed: October 13, 1994
    Date of Patent: August 19, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Akira Miyamae, Hajime Kinoshita
  • Disk driving motor
    Patent number: 5653541
    Abstract: A magnetic disk driving device includes a frame which supports a shaft, a hub adapted to hold a disk, and upper and lower bearings which are fitted in a bearing holding hole and rotatably support the hub. The frame includes a cylindrical protrusion which is confronted through a small gap d with the outer cylindrical surface of the outer race of the lower bearing. The small gap d forms a labyrinth in the space through which the inside of the lower bearing is communicated with the outside. The inner cylindrical surface of an annular protrusion formed on the bottom of the hub, and the inner cylindrical surface of the cylindrical protrusion are substantially equal in diameter.
    Type: Grant
    Filed: August 15, 1995
    Date of Patent: August 5, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Yutaka Ishizuka, Shinji Kinoshita
  • Magnetic disk drive motor
    Patent number: 5654597
    Abstract: A magnetic disk drive motor includes a hub stand for driving a disk while carrying the disk thereon, a shaft fixed to the middle of the hub stand, a rotor case attached to an end of the shaft and having a drive magnet on an inner side of a circumferential wall thereof, a substantially cylindrical housing rotatably supporting the shaft through a bearing, and a base plate supporting a stator core, wherein an end of the bearing is in slidable contact with the hub stand; and at least a part of the one end surface of the bearing is cut away.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: August 5, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Hiroshi Sakashita, Eiji Arasaki
  • Motor speed detecting device
    Patent number: 5655054
    Abstract: A device for detecting the speed of a plural-phase motor in which a speed deviation occurring every m periods is eliminated, to provide a speed detection signal high in accuracy at low cost. The motor speed detecting device in which, among drive signals driving a plural-phase motor, m-phase drive signals (where m is a natural number which is not less than two (2) and equal to or smaller than the number of phases of said motor) are detected, and combined to form a signal, comprises a frequency divider adapted to subject the signal thus formed to 1/(m.times.n) frequency division (where n is a natural number).
    Type: Grant
    Filed: November 30, 1995
    Date of Patent: August 5, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventor: Isao Ushikoshi
  • Hologram integrated with a beam splitter to separate a plurality of polarized reflected light beams
    Patent number: 5648950
    Abstract: In an optical pickup system, the light emitted from a source to illuminate an optical recording medium is reflected and directed via a beam splitter to a photodetector so as to read information signals, and a hologram device for splitting the emerging light from the source into a plurality of beams is provided as an integral part of the entrance surface of the beam splitter.
    Type: Grant
    Filed: October 25, 1995
    Date of Patent: July 15, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Tadashi Takeda, Yoshio Hayashi
  • Method of measuring natural frequency of motor
    Patent number: 5644084
    Abstract: A current feed means is connected to an armature coil of a motor. Current is fed from the current feed means to the armature coil while the frequency of the current is gradually varied from a preset frequency to another preset frequency, thereby to vibrate the motor. The amplitudes of the frequencies are measured by a frequency analyzer means, which is brought into contact with the motor. The frequency at which the amplitude of the vibration of the motor is peaked indicates the natural frequency of the motor.
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: July 1, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Shinji Kinoshita, Mitsuru Ide, Koichi Katakura
  • Magnetic disk drive motor having a fixed shaft with circumferential grooves for integrating the bearing therewith and having a disc abutting the outer ring of the bearing
    Patent number: 5638233
    Abstract: A magnetic disc drive motor contains a frame; a fixed shaft mounted on the frame and provided with two circumferential grooves; a bearing member including: a plurality of balls disposed in the circumferential grooves; upper and lower roller rings mounted on the fixed shaft through the halls disposed in the circumferential grooves; a pre-loading spring mounted between the upper and lower roller rings; a rotor fixed to one end of the lower roller ring and provided with a loading surface formed in its upper surface; and a motor member mounted below the rotor, wherein the upper and lower roller rings are exposed above the upper surface of the rotor, the roller rings are fitted in center holes of magnetic discs, and inner peripheral portions of the magnetic discs are loaded on a loading surface of the rotor.
    Type: Grant
    Filed: November 2, 1995
    Date of Patent: June 10, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventor: Yutaka Ishizuka
  • Magnetic disk drive motor including a fixed shaft having mounted thereon a ball bearing with a rotor fixed at one end thereof and having a disc abutting the outer ring of the bearing
    Patent number: 5636084
    Abstract: A magnetic disc drive motor contains a frame; a fixed shaft mounted on the frame; a ball bearing for rotatably supporting a magnetic disc by fitting an inner center hole of the magnetic disc on an outer ring of the ball bearing, an inner ring of the magnetic disc being secured to the fixed shaft; a rotor fixed to one end of the ball bearing, the rotor having a loading surface defined on an upper surface thereof; and a motor member including: a rotor member mounted in an inside of the rotor; and a stator member secured on the frame, wherein the inner peripheral portion of the magnetic disc fitted on the outer ring of the ball bearing is mounted on the loading surface of the rotor.
    Type: Grant
    Filed: November 2, 1995
    Date of Patent: June 3, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventor: Yutaka Ishizuka
  • Magnetic disc drive device
    Patent number: 5633769
    Abstract: A magnetic disc drive device includes a labyrinth structure proximate to the ball bearings to effectively prevent scattering of particles. The labyrinth structures are formed by various arrangements where complicated passages are defined by elements arranged proximate to the inner ring and the outer ring of a ball bearing. One of the elements forming the passages being either the hub or the frame of the magnetic disc drive device.
    Type: Grant
    Filed: May 11, 1995
    Date of Patent: May 27, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Shinji Kinoshita, Mitsuru Ide, Toru Kumagai
  • Lubricating oil composition for use with sintered porous bearings
    Patent number: 5631211
    Abstract: Lubricating oil composition for use with sintered porous bearings includes a poly-.alpha.-olefin hydride or ethylene-.alpha.-olefin copolymer hydride containing base oil to which at least one additive selected from the group consisting of zinc dialkyl dithiophosphate, molybdenum dialkyl dithiocarbide, molybdenum dialkyl dithiophosphate and a sulfur-phosphorus containing extreme pressure additive is added in an amount of 0.01 to 5 parts by weight per 100 parts by weight of the base oil.
    Type: Grant
    Filed: November 1, 1994
    Date of Patent: May 20, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Hisaya Nakagawa, Michiaki Takizawa, Teruhiko Ohtaki, Katsumi Nagano, Masuhiro Onoyama, Tetsuo Ichimaru
  • Fluid bearing unit and manufactured method thereof
    Patent number: 5628569
    Abstract: A fluid bearing unit includes a shaft; a bearing; bearing fluid arranged between a shaft and a bearing which are rotatably engaged with each other so that they can be relatively rotated so as to generate dynamic pressure in the bearing fluid, wherein at least one of the bearing and the member for fixing the bearing unit is made of iron alloy having the volumetric magnetostriction of which acts to cancel the thermal expansion so as to become the coefficient of linear expansion thereof lower than that of the shaft.
    Type: Grant
    Filed: October 18, 1994
    Date of Patent: May 13, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Masamichi Hayakawa, Masato Gomyo, Toshihiko Miyakoshi, Arihiro Yonezawa
  • Device for transmitting signals from position detector and method of such signal transmission
    Patent number: 5625353
    Abstract: A transmitting device, for transmitting position detector signals, comprises a controller for processing signals on various kinds of data from an object of interest; a position detector that has a magnetic pole detecting portion and which detects position data on the object of interest; an up-down counter that counts in an ascending or descending order on the basis of two-phase output signals that are produced from the position detector in accordance with the change in the position of the object of interest; a converting circuit portion in which both the counter value as produced from the up-down counter or the change in the counter value per unit time and a magnetic pole position detection signal as produced from the magnetic pole detecting portion are converted to a serial signal; and a transmission path for transmitting the serial signal to the controller.
    Type: Grant
    Filed: December 28, 1993
    Date of Patent: April 29, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Takashi Katagiri, Tetsuo Momose
  • Motor control system for controlling the operations of a plurality of servo motors
    Patent number: 5619111
    Abstract: Functional element units are fixedly mounted on a circuit board, and unit-side connectors are electrically wired to base-board-side connectors. A predetermined wiring circuit has been formed on the circuit board, with the result that the wiring work is simplified as much, and the disused connectors can be disposed of, so that the number of connectors is reduced. In addition, the electrical connection of the functional element units through those connectors, provides the following effects: the wiring is orderly and reasonable, the number of wires is small, the occurrence of wiring errors is prevented, and in addition the application of external noises to the wires is prevented. That is, the operation of the motor control system high in reliability.
    Type: Grant
    Filed: January 19, 1996
    Date of Patent: April 8, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Takashi Katagiri, Tetsuo Momose
  • Optical beam scanner
    Patent number: 5617241
    Abstract: A rotating polygon mirror for optical beam scanning. The polygon mirror is fixed to a rotating shaft and is rotated at a high speed by a drive force of a rotating drive with brushes. Additionally, a magnet is fixed to an inner circumferential surface of a yoke casing that supports the rotating shaft through a bearing, and a rotor core is positioned to confront the magnet fixed to the rotating shaft.
    Type: Grant
    Filed: June 28, 1994
    Date of Patent: April 1, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventor: Hideo Kitazawa
  • Magnetic card reader
    Patent number: 5612526
    Abstract: A magnetic card reader receives a magnetic card with a magnetic stripe through an entrance port, transports the magnetic card along a transport path by transporting unit, carries out a process of reading and writing information out of and to the magnetic stripe of the magnetic card by magnetic read/write unit located facing the transport path, cuts the magnetic card into at least two cards in the direction orthogonal to the card transporting direction by a cutter unit located in the transport path, and guides those cut cards to a card discharge path or a collector path, both being continuous to the transport path, by first path-selector unit located at the intersection of the card discharge path and the collector path.
    Type: Grant
    Filed: October 6, 1995
    Date of Patent: March 18, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Shigeki Oguchi, Jun-ichi Yazaki, Shigeyuki Nagata
  • Brushless motor with hall elements for controlling drive circuit and for detecting a position of rotor by use of magnetic flux varying means
    Patent number: 5610457
    Abstract: A brushless motor including: a rotor casing having a cylindrical wall with an opening, the rotor casing holding a magnet therein, the magnet having an exposed portion which is exposed through the opening of the rotor casing; a stator core having drive coils; Hall elements for detecting the magnetic field of the magnet, the Hall elements being arranged outside the cylindrical wall of the rotor casing; a drive circuit applying drive currents to the drive coils in accordance with output signals of the Hall elements; a magnetic flux varying member provided at a point on the cylindrical wall of the rotor casing; and an index signal processing circuit for generating an index signal in accordance with an output signal of one of the Hall elements.
    Type: Grant
    Filed: February 7, 1995
    Date of Patent: March 11, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventor: Yukinobu Kurita
  • Multiple-task controller having a plurality of task memory input/output devices, input/output processing device, and a plurality of tasks controlled by external devices
    Patent number: 5608906
    Abstract: A multiple-task controller includes a plurality of tasks which are controlled with first and second external devices: task memory input/output devices provided respectively for the tasks; a serial input/output processing section and a parallel input/output processing section which process signals transmitted between the first and second external device and the input/output processing section, and perform writing and reading operations with respect to the task memory input/output devices; and a task control section which applies commands written in the task input/output devices respectively to the tasks, and applies the states of process of the tasks respectively to the task memory input/output devices.
    Type: Grant
    Filed: June 23, 1994
    Date of Patent: March 4, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Hiroshi Tonouchi, Masashi Furukawa