| Patent | Date |
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Displacement information detection apparatus
Grant 6,617,572 - Ishizuka September 9, 2 | 2003-09-09 |
Displacement detection apparatus, and magnetic recording apparatus and encoder using the displacement detection apparatus
App 20020021523 - Ishizuka, Koh | 2002-02-21 |
Displacement information detection apparatus
App 20010013583 - Ishizuka, Koh | 2001-08-16 |
Apparatus for optically detecting displacement of an object using a synthesizing means utilizing a substrate with two diffraction gratings thereon
Grant 5,680,211 - Kaneda , et al. October 21, 1 | 1997-10-21 |
Rotary encoder measuring substantially coinciding phases of interference light components
Grant 5,661,296 - Ishizuka , et al. August 26, 1 | 1997-08-26 |
Apparatus for measuring relative displacement between the apparatus and a scale which a grating is formed
Grant 5,621,527 - Kaneda , et al. April 15, 1 | 1997-04-15 |
Head positioning using a disk drive mounted to a rotating table
Grant 5,568,337 - Eguchi , et al. October 22, 1 | 1996-10-22 |
Velocity information detecting apparatus
Grant 5,557,396 - Ishizuka , et al. September 17, 1 | 1996-09-17 |
Rotary detector having an optical system for guiding two diffracted lights
Grant 5,532,819 - Ishizuka , et al. July 2, 1 | 1996-07-02 |
Rotation information detection apparatus
Grant 5,498,870 - Ishizuka March 12, 1 | 1996-03-12 |
Displacement detection apparatus
Grant 5,483,377 - Kaneda , et al. January 9, 1 | 1996-01-09 |
Apparatus with light-emitting element and method for producing it
Grant 5,438,586 - Ishii , et al. August 1, 1 | 1995-08-01 |
Measuring method and measuring apparatus for determining the relative displacement of a diffraction grating with respect to a plurality of beams
Grant 5,404,220 - Takeuchi , et al. April 4, 1 | 1995-04-04 |
Displacement information detection apparatus for receiving a divergent light beam
Grant 5,390,022 - Ishizuka , et al. February 14, 1 | 1995-02-14 |
Encoder using a birefringent element and a system including the same
Grant 5,302,821 - Igaki , et al. April 12, 1 | 1994-04-12 |
Displacement detecting device with integral optics
Grant 5,283,434 - Ishizuka , et al. February 1, 1 | 1994-02-01 |
Encoder with high resolving power and accuracy
Grant 5,146,085 - Ishizuka , et al. September 8, 1 | 1992-09-08 |
Method of optically detecting position of object and position detecting apparatus using the method
Grant 5,129,725 - Ishizuka , et al. July 14, 1 | 1992-07-14 |
Rotary encoder having a plurality of beams emitted by a diffraction grating
Grant 5,101,102 - Nishimura , et al. March 31, 1 | 1992-03-31 |
Displacement measuring apparatus
Grant 5,066,130 - Tsukiji , et al. November 19, 1 | 1991-11-19 |
Encoder incorporating a displaceable diffraction grating
Grant 5,038,032 - Nishimura , et al. August 6, 1 | 1991-08-06 |
Relief diffraction grating encoder
Grant 5,021,649 - Nishimura , et al. June 4, 1 | 1991-06-04 |
Diffracted beam encoder
Grant 5,017,777 - Ishizuka , et al. May 21, 1 | 1991-05-21 |
Encoder having long length measuring stroke
Grant 4,998,798 - Ishizuka , et al. March 12, 1 | 1991-03-12 |
Displacement measuring apparatus
Grant 4,979,826 - Ishizuka , et al. December 25, 1 | 1990-12-25 |
Encoder
Grant 4,933,673 - Ishizuka , et al. June 12, 1 | 1990-06-12 |
Encoder for forming interference fringes by re-diffracted lights from an optical type scale and photoelectrically converting the interference fringes to thereby detect the displacement of the scale
Grant 4,930,895 - Nishimura , et al. June 5, 1 | 1990-06-05 |
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