Patents by Inventor Tadashi Okada

Tadashi Okada 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: 5734241
    Abstract: A brushless motor includes a stationary member; a rotating member rotatably supported with respect to the stationary member; a stator provided in the stationary member and provided with a stator coil for generating current magnetic field under an exciting state; and a rotor magnet provided in the rotating member for obtaining a revolutionary power due to an electromagnetic mutual effect with the current magnet field of the stator coil. The rotor magnet is formed such that segment-shaped magnets are placed annularly with predetermined gaps circumferentially. The gaps are filled with a magnetic resin material.
    Type: Grant
    Filed: July 25, 1996
    Date of Patent: March 31, 1998
    Assignee: Nidec Corporation
    Inventors: Tadashi Okada, Akira Inui
  • Patent number: 5625757
    Abstract: In a printing system including a plurality of terminal equipment, a plurality of printers which can be shared by the terminal equipment, one or more printer/spooler control servers each for receiving a print from the terminal equipment and for controlling the print by the printer, and a distributed printing management server, for various errors which occur in the printers, the contents of the errors are informed to the user and an error recovery process according to the error is realized. Thus, a use efficiency, performance, reliability, and serviceability as a printing system are improved.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: April 29, 1997
    Assignee: Hitachi, Ltd.
    Inventors: Seiji Kageyama, Satoru Matsumoto, Makoto Kitagawa, Takuya Shimakawa, Junichi Kazama, Tadashi Okada
  • Patent number: 5604412
    Abstract: A brushless motor includes a stationary member; a rotating member rotatably supported with respect to the stationary member; a stator provided in the stationary member and provided with a stator coil for generating current magnetic field under an exciting state; and a rotor magnet provided in the rotating member for obtaining a revolutionary power due to an electromagnetic mutual effect with the current magnet field of the stator coil. The rotor magnet is formed such that segment-shaped magnets are placed annularly with predetermined gaps circumferentially. The gaps are filled with a magnetic resin material.
    Type: Grant
    Filed: March 16, 1994
    Date of Patent: February 18, 1997
    Assignee: Nidec Corporation
    Inventors: Tadashi Okada, Akira Inui, Kazuya Shigemori
  • Patent number: 5250883
    Abstract: There is provided a drive control apparatus for a motor having a drive device for controlling current supplied to an armature coil, a control device for controlling the rotation speed of a rotor, and a mode switch device for comparing a rotation speed signal and a predetermined reference voltage and generating a normal rotation mode signal or a reverse rotation mode signal. Furthermore, the drive control device has the drive device, the control device and a signal delay device. The signal delay device delays the supply of a stop signal from the control device by a predetermined time, and a reverse current is supplied to the armature coil during the delay time.
    Type: Grant
    Filed: February 18, 1992
    Date of Patent: October 5, 1993
    Assignee: Nippon Densan Corporation
    Inventor: Tadashi Okada
  • Patent number: 5245234
    Abstract: A scanning motor having a bracket, a shaft member secured to the bracket, a rotor rotatably supported by the shaft member via a pair of bearings and a polygonal mirror fastened to the rotor, the polygonal mirror being disposed at a position on the outside of either of a pair of the bearings. The rotor has a rotor body and a yoke member which constitutes a balance adjusting groove in cooperation with a frequency generating magnet fastened to the yoke member. A motor having a bracket, a rotor, magnetic force generating means disposed in the bracket, magnetic flux changing means fastened to the rotor, sensing means for sensing change in the magnetic flux taken place in a magnetic circuit constituted by the magnetic force generating means and the magnetic flux changing means and a covering member for covering the magnetic force generating means.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: September 14, 1993
    Assignee: Nippon Densan Corporation
    Inventors: Tadashi Okada, Yoshio Fujii
  • Patent number: 5003493
    Abstract: An image forming apparatus comprising rotatable cassettes rotated by cassette rotating means between a longitudinal feeding station from which paper is fed in a longitudinal direction thereof and a lateral feeding station from which paper is fed in a lateral direction thereof, wherein memory means stores a cassette rotation signal, when the cassette rotation signal is entered therein and cassette rotating means is controlled in accordance with the cassette rotation signal stored in the memory means when a cassette rotation permission signal for permitting the rotation of the rotatable cassette is generated, so that the rotatable cassette is set in a predetermined feeding station.The invention also provides an image forming apparatus capable of storing the feeding station of the rotatable cassette in the memory means and rotating the rotatable cassette to the feeding station stored in the memory means when the rotatable cassette is out of both longitudinal feeding station and lateral feeding station.
    Type: Grant
    Filed: November 3, 1989
    Date of Patent: March 26, 1991
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tadashi Okada, Junichi Kajiwara, Toshihisa Matsuo, Atsushi Narukawa, Masashi Toyoda, Yoshikado Yamada, Yoshiteru Mori, Yoshiyuki Noda, Hideo Taniguchi, Katsutoshi Ishikawa
  • Patent number: 4838120
    Abstract: A limited slip differential of this invention is equipped with two centrifugal clutches that are interposed between a differential casing and side gears or pinion gears. The centrifugal clutches provide a direct drive between the casing and the side gears in high speed driving.
    Type: Grant
    Filed: April 21, 1983
    Date of Patent: June 13, 1989
    Assignee: Nissan Motor Company, Limited
    Inventors: Tadashi Okada, Yuuji Furukawa, Makoto Murata
  • Patent number: 4466635
    Abstract: A suspension mechanism for a wheeled vehicle, comprising a suspension arm having a pair of arm portions aligned with each other in a lateral direction of the vehicle body and pivotally connected to the vehicle body for being rockable about a first axis fixed with respect to the vehicle body and transverse to the vehicle body; a wheel axle which is pivotally connected to the suspension arm and rockable about a second axis fixed with respect to the suspension arm and perpendicular to the first axis and which has a spindle portion having a center axis about which a wheel-and-tire assembly is rotatable; and angle adjusting means engaging the suspension arm and the wheel axle and adapted to permit adjustment of the angular position of the wheel axle with respect to the suspension arm about the second axis.
    Type: Grant
    Filed: February 24, 1983
    Date of Patent: August 21, 1984
    Assignee: Nissan Motor Company, Limited
    Inventors: Tadashi Okada, Yuji Furukawa, Makoto Murata
  • Patent number: 4099205
    Abstract: A television signal is encoded by the use of a sampling pulse synchronized with a color subcarrier frequency included in an input television signal, the encoded signal is compressed and recorded in a memory for later reproduction of a desired compressed picture image having a desired size and center position, the recorded signal is reproduced under the control of a clock pulse signal produced in synchronism with a sync signal obtained in a studio, for example, and the reproduced signal is corrected by inverting the polarity of the chroma component according to frame information at the time of recording of said reproduced signal.Thus, it is possible to freely obtain phase coupling of different synchronizing signals; for instance, it is possible to bring the phase of a different television signal of a different synchronization system into coincidence with the phase of a central synchronization signal and it is possible to reproduce an object image optionally compressed on a TV display screen.
    Type: Grant
    Filed: October 26, 1976
    Date of Patent: July 4, 1978
    Assignees: Chubu-Nippon Broadcasting Co., Ltd., Matsushita Electric Industrial Co., Ltd.
    Inventors: Hajime Hattori, Eiji Usui, Takashi Oya, Kaneyoshi Sugawa, Eiji Kezuka, Tadashi Okada, Toshiro Watanabe
  • Patent number: 4063280
    Abstract: Chroma-signal processing system is disclosed wherein a color television signal is sampled at a frequency equal to a sub-carrier frequency multiplied by an integer, and chroma-components of the sampled signals are sequentially stored in a plurality of storage means for each of the sample points, and the chroma-signals are retrieved from the storage means while omitting portions of the chroma signals whereby accomplishing the chroma-signal processing with a fewer number of storage means. The system can be used to reduce the size of a displayed color image without introducing phase discontinuities into the chrominance subcarrier. The reduced image may then be inset into another color image displayed on a CRT. The system may also be used to reduce the subcarrier frequency of a chrominance signal.
    Type: Grant
    Filed: September 27, 1976
    Date of Patent: December 13, 1977
    Assignees: Matsushita Electric Industrial Co., Ltd., Chubu-Nippon Broadcasting Co., Ltd.
    Inventors: Hajime Hattori, Tadashi Okada, Eiji Kezuka