Patents by Inventor Yoshifumi Tsukada

Yoshifumi Tsukada 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).

  • Disc player with objective lens arranged in a zigzag pattern
    Patent number: 6262964
    Abstract: A disc player has a first array of pickup devices arranged in a line for reading information from a disc and a second array of pickup devices arranged in a parallel line. The pickup devices are each independently movable along their respective lines with the devices of the first line offset from the devices of the second line so as to form a zigzag pattern.
    Type: Grant
    Filed: June 8, 1999
    Date of Patent: July 17, 2001
    Assignee: Pioneer Electronic Corporation
    Inventors: Hiroshi Yokota, Ryuichi Naito, Hiroyuki Hirano, Katsumi Ishii, Shinichi Naohara, Yoshifumi Tsukada, Kanya Matsumoto
  • Disc player with parallel objective lenses
    Patent number: 5848049
    Abstract: A disc player includes at least one pickup device, which includes a pair of objective lenses for reading information from a disc. The pair of objective lenses are independently movable in the radial direction of the disc by a magnetic field generated by a common magnet.
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: December 8, 1998
    Assignee: Pioneer Electronic Corporation
    Inventors: Hiroshi Yokota, Ryuichi Naito, Hiroyuki Hirano, Katsumi Ishii, Shinichi Naohara, Yoshifumi Tsukada, Kanya Matsumoto
  • Disc player
    Patent number: 5677904
    Abstract: A disc player includes: a plurality of pickup devices for reading information from a disc; and a plurality of guide devices having a longitudinal axis for transferring the pickup device, the longitudinal axis being directed in a direction rotated by a predetermined angle with respect to a radial direction of the disc.
    Type: Grant
    Filed: October 10, 1995
    Date of Patent: October 14, 1997
    Assignee: Pioneer Electronic Corporation
    Inventors: Hiroshi Yokota, Ryuichi Naito, Hiroyuki Hirano, Katsumi Ishii, Shinichi Naohara, Yoshifumi Tsukada, Kanya Matsumoto
  • Pulling-in circuit for PLL circuit, pulling-in method for PLL circuit, PLL circuit device and apparatus for reproducing optical disc
    Patent number: 5671201
    Abstract: A PLL circuit, to which an input signal is inputted, is provided with: a voltage controlled oscillator for outputting an output signal; a control voltage generation circuit for generating a control voltage to lock phases of the input and output signals by a loop, and outputting the generated control voltage to a control input terminal of the voltage controlled oscillator; and a central frequency setting circuit for setting a central frequency, to which a frequency of the output signal is to be pulled-in, to the control voltage generation circuit.
    Type: Grant
    Filed: October 29, 1996
    Date of Patent: September 23, 1997
    Assignee: Pioneer Electronic Corporation
    Inventors: Hiroshi Yokota, Ryuichi Naito, Hiroyuki Hirano, Katsumi Ishii, Shinichi Naohara, Yoshifumi Tsukada, Kanya Matsumoto
  • Method and apparatus for reproducing information recorded on CLV disc type record medium
    Patent number: 5646921
    Abstract: A record medium of disc type is recorded by a constant linear velocity. The record medium is reproduced by a reproducing apparatus, which reads the information from the rotated record medium into a buffer memory by a transmission rate corresponding to the number of rotation of the record medium and outputs the read information from the buffer memory to an external apparatus by a predetermined output rate.
    Type: Grant
    Filed: October 11, 1995
    Date of Patent: July 8, 1997
    Assignee: Pioneer Electronic Corporation
    Inventors: Hiroshi Yokota, Ryuichi Naito, Hiroyuki Hirano, Katsumi Ishii, Shinichi Naohara, Yoshifumi Tsukada, Kanya Matsumoto
  • Pulling-in circuit for PLL circuit, pulling-in method for PLL circuit, PLL circuit device and apparatus for reproducing optical disc
    Patent number: 5619484
    Abstract: A PLL circuit, to which an input signal is inputted, is provided with: a voltage controlled oscillator for outputting an output signal; a control voltage generation circuit for generating a control voltage to lock phases of the input and output signals by a loop, and outputting the generated control voltage to a control input terminal of the voltage controlled oscillator; and a central frequency setting circuit for setting a central frequency, to which a frequency of the output signal is to be pulled-in, to the control voltage generation circuit.
    Type: Grant
    Filed: October 11, 1995
    Date of Patent: April 8, 1997
    Assignee: Pioneer Electronic Corporation
    Inventors: Hiroshi Yokota, Ryuichi Naito, Hiroyuki Hirano, Katsumi Ishii, Shinichi Naohara, Yoshifumi Tsukada, Kanya Matsumoto