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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Tanaka; Tomiji
Address:
Saitama, JP
No. of patents:
14
Patents:












Patent Number Title Of Patent Date Issued
8194517 Hologram recording and reproducing device and method for recording hologram June 5, 2012
A hologram recording and reproducing device controls an optical beam output from an external cavity semiconductor laser to improve a diffraction efficiency. The hologram recording and reproducing device includes an external cavity laser, a photodiode, a laser drive circuit and a lase
8134765 Hologram recording and reconstruction apparatus March 13, 2012
A hologram recording and reconstruction apparatus records and reconstructs a hologram in a recording layer of a holographic recording medium using a signal light beam and a reference light beam. The apparatus includes an objective lens, a spatial light modulator on which a reference
8130620 Hologram recording/reproducing device, method thereof, and holographic recording medium March 6, 2012
A hologram recording/reproducing device includes an optical section which irradiates a holographic recording medium with an optical beam; and a control unit which controls the optical section. The optical section includes a laser light source which emits the optical beam, and a spatial
7969846 Hologram recording and reproducing device and method for recording hologram June 28, 2011
A hologram recording and reproducing device controls an optical beam output from an external cavity semiconductor laser to improve a diffraction efficiency. The hologram recording and reproducing device includes an external cavity laser, a photodiode, a laser drive circuit and a lase
7889407 Method for producing a duplicate hologram recording medium, apparatus for producing a duplicatio February 15, 2011
An apparatus for producing a duplicate hologram recording medium includes: a positioning section configured to place the duplication master and the duplicate hologram recording medium at predetermined relative positions; an angle selective plate arranged between the duplication master an
7808876 Hologram recording/reconstructing apparatus October 5, 2010
A hologram recording/reconstructing apparatus includes a spatial modulator in which a reference beam region and a reconstruction beam region are formed, and a controller configured to control a range of the reference beam region and a range of the reconstruction beam region. According to
7729400 External cavity type semiconductor laser June 1, 2010
An external cavity type semiconductor laser that has a larger output and a more excellent single mode characteristic than a conventional external cavity type semiconductor laser is provided. The external cavity type semiconductor laser has a laser diode 11, a window glass 16, a grating,
7580433 Laser system August 25, 2009
A laser system includes a laser diode that oscillates in a multi-mode and has characteristics in which its oscillation wavelength varies with temperature, a grating that receives a light beam emitted from the laser diode and returns a diffracted beam to the laser diode, a mechanism that
7502151 Holographic recording and reconstructing apparatus and method March 10, 2009
A holographic recording and reconstructing apparatus includes a light source having a variable oscillation wavelength; a temperature sensing unit operable to sense temperature; and a control unit operable to record information about a temperature sensed by the temperature sensing unit on
7426222 Laser apparatus September 16, 2008
A laser apparatus is disclosed. An optical element receives at least a part of laser light emitted from a laser generation source and generates interference fringes. Each of first and second two-divided detectors has two detectors arranged in the direction of which the interference fring
7366221 Laser apparatus and method of driving diffraction grating April 29, 2008
A laser apparatus is disclosed. The laser apparatus has a diffraction grating that receives laser light from a semiconductor laser, emits first order diffracted light having a predetermined wavelength to the semiconductor laser, and reflects zero-th order light, a reflection section
7310173 Hologram recording method, hologram recording reproduction method, hologram recording device, ho December 18, 2007
In the hologram recording and hologram-record reproduction using a one-dimensional optical modulator, the one-dimensional optical modulator where a plurality of light-modulating pixels are arranged modulates a laser beam to record a digital-data signal on a hologram recording medium,
4955007 Thermomagnetic recording method applying power modulated laser on a magnetically coupled double September 4, 1990
Thermomagnetic recording method using a thermomagnetic recording medium having a superposed layer of magnetically coupled first and second magnetic thin films is disclosed. The magnetic thin film includes a portion where the respective magnetic moments of the first and second thin fi
4878132 Thermomagnetic recording method applying power modulated laser on a magnetically coupled multi-l October 31, 1989
A thermomagnetic recording method is disclosed using a thermomagnetic recording medium where first, second and third magnetic thin films each formed of rare-earth and transition metals are sequentially superposed to form layers in a magnetically coupled manner. The recording is carried o










 
 
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