Patents Assigned to Seikosha Co., Ltd.
  • Arrangement for compensating for variable speed of a camera shutter
    Patent number: 5220376
    Abstract: A camera shutter system has a motor driven sector for opening and closing a shutter opening. A photo-interruptor is positioned to intercept a light beam, to effect the outputting by the photo-interruptor of a signal pulse corresponding to the speed of the shutter. A memory storing exposure data, such as a matrix memory, is accessible as a function of the speed signal and an exposure quantity that is a function of the brightness of the brightness of an object to be photographed. The accessed exposure data is modified as a function of an observed exposure quantity.
    Type: Grant
    Filed: June 24, 1991
    Date of Patent: June 15, 1993
    Assignee: Seikosha Co., Ltd.
    Inventors: Shigeru Tagami, Kazuo Akimoto, Kanji Ito, Katsuhiko Matsushita
  • Printing control method
    Patent number: 5217310
    Abstract: A print head of a dot printer is controlled to move at a speed that is a function of a maximum dot duty cycle value from an accumulation of dot duty cycle values that are functions of the numbers of dots in the various columns of a line of print and a constant value.
    Type: Grant
    Filed: April 24, 1991
    Date of Patent: June 8, 1993
    Assignee: Seikosha Co., Ltd.
    Inventor: Atsushi Watanabe
  • Instant photocopying apparatus
    Patent number: 5218401
    Abstract: An instant photocopying apparatus that allows scanning of an optical means to be carried out plural times continuously by one copying starting operation in the instant photocopying apparatus for sequentially imaging and copying fine areas of an object on an instant photosensitive material by scanning the optical means in parallel to the object is provided.A scanning number setting means 57 is provided and a control circuit 48 is programmed so that it scans continuously by the number of times set by the scanning number setting means 57. An user set any scanning number by the scanning number setting means 57. Then when a start switch SW3 is pressed, the control circuit 48 lights up an illuminating means 24 and issues a command to a motor driving circuit 54 to scan continuously by the preset number of times from one end to the other end of a copying area.
    Type: Grant
    Filed: April 29, 1992
    Date of Patent: June 8, 1993
    Assignee: Seikosha Co., Ltd.
    Inventors: Masuo Ogihara, Hiroaki Ishida, Hajime Oda
  • Focal plane shutter
    Patent number: 5214463
    Abstract: A focal plane shutter has at least one shutter blade group comprised of a leading blade and a set of trailing blades. A first parallel link mechanism is pivotally connected at two spaced locations to the leading blade to effect displacement of the leading blade relative to a shutter opening. A second parallel link mechanism is pivotally connected at two or more spaced locations to the set of trailing blades to effect displacement of the trailing blades relative to the shutter opening. The distance between the two pivotal connections of the first parallel link mechanism is greater than the distance between the at least two pivotal connections of the second parallel link mechanism.
    Type: Grant
    Filed: March 29, 1991
    Date of Patent: May 25, 1993
    Assignee: Seikosha Co., Ltd.
    Inventors: Hiroaki Ishida, Ichiro Nemoto, Hiroyuki Izumi
  • Piezoelectric printer
    Patent number: 5207518
    Abstract: A piezoelectric printer including a piezoelectric actuator having piezoelectric elements for driving printing elements. A drive voltage applied to the piezoelectric elements for printing operations fluctuates with a predetermined period and amplitude. The drive voltage applied to the piezoelectric elements can fluctuate with a period or amplitude related to a gradation signal for effecting printing gradation.
    Type: Grant
    Filed: March 28, 1991
    Date of Patent: May 4, 1993
    Assignee: Seikosha Co., Ltd.
    Inventor: Mikio Hayashi
  • Acoustic signal generator with means for changing the time constant of the envelope signal
    Patent number: 5208414
    Abstract: An acoustic signal synthesizer stores a plurality of different acoustic data and includes a separate D-A converter connected to receive each of the different acoustic data. The D-A converters are responsive to separate envelope generators for controlling their respective outputs. A controller controls the output of the acoustic data to the respective D-A converter and simultaneously controls the respective envelope generator output. The output of the converters are mixed.
    Type: Grant
    Filed: September 16, 1991
    Date of Patent: May 4, 1993
    Assignee: Seikosha Co., Ltd.
    Inventor: Kunio Yamada
  • Clock
    Patent number: D335087
    Type: Grant
    Filed: January 11, 1991
    Date of Patent: April 27, 1993
    Assignee: Seikosha Co., Ltd.
    Inventor: Katsumi Shimamura
  • Clock movement
    Patent number: D335099
    Type: Grant
    Filed: May 24, 1991
    Date of Patent: April 27, 1993
    Assignee: Seikosha Co., Ltd.
    Inventors: Nobuhiro Goto, Hidetsugu Ikeda
  • Clock movement housing set
    Patent number: D335101
    Type: Grant
    Filed: May 24, 1991
    Date of Patent: April 27, 1993
    Assignee: Seikosha Co., Ltd.
    Inventor: Nobuhiro Goto
  • Timer
    Patent number: D335460
    Type: Grant
    Filed: January 11, 1991
    Date of Patent: May 11, 1993
    Assignee: Seikosha Co. Ltd.
    Inventor: Makoto Tanaka
  • Travel alarm clock
    Patent number: D335629
    Type: Grant
    Filed: July 26, 1990
    Date of Patent: May 18, 1993
    Assignee: Seikosha Co., Ltd.
    Inventor: Asao Takashima
  • Clock
    Patent number: D335630
    Type: Grant
    Filed: May 10, 1991
    Date of Patent: May 18, 1993
    Assignee: Seikosha Co., Ltd.
    Inventor: Mitsuo Wada
  • Clock
    Patent number: D335631
    Type: Grant
    Filed: November 23, 1990
    Date of Patent: May 18, 1993
    Assignee: Seikosha Co., Ltd.
    Inventor: Tsuyoshi Oyanagi
  • Clock
    Patent number: D335632
    Type: Grant
    Filed: January 11, 1991
    Date of Patent: May 18, 1993
    Assignee: Seikosha Co., Ltd.
    Inventors: Tsuyoshi Oyanagi, Seiji Odaka
  • Clock
    Patent number: D335633
    Type: Grant
    Filed: May 10, 1991
    Date of Patent: May 18, 1993
    Assignee: Seikosha Co., Ltd.
    Inventor: Mitsuo Wada
  • Watch band
    Patent number: D335636
    Type: Grant
    Filed: June 6, 1991
    Date of Patent: May 18, 1993
    Assignee: Seikosha Co., Ltd.
    Inventor: Ryoichi Kaneko
  • Clock
    Patent number: D336048
    Type: Grant
    Filed: January 25, 1991
    Date of Patent: June 1, 1993
    Assignee: Seikosha Co., Ltd.
    Inventors: Keiko Nomura, Mariko Minami
  • Clock
    Patent number: D336249
    Type: Grant
    Filed: May 31, 1991
    Date of Patent: June 8, 1993
    Assignee: Seikosha Co., Ltd.
    Inventor: Hisako Sugano
  • Clock
    Patent number: D336437
    Type: Grant
    Filed: July 22, 1991
    Date of Patent: June 15, 1993
    Assignee: Seikosha Co., Ltd.
    Inventor: Hisako Sugano
  • Clock
    Patent number: D336438
    Type: Grant
    Filed: August 8, 1991
    Date of Patent: June 15, 1993
    Assignee: Seikosha Co., Ltd.
    Inventor: Satoshi Wakahara