| Patent Number |
Title Of Patent |
Date Issued |
| 5416757 |
Optical disk drive system for use with disks having different protection layer depths |
May 16, 1995 |
| The objective lens of an optical disk drive has a suitable positioning and numerical aperture so that the light beam will be focused into a spot on the optical media of a first optical disk having a cover plate with a first thickness. When a second optical disk is utilized having a cover |
| 5253236 |
Optical beam focusing and tracking system for an optical disk information storage device |
October 12, 1993 |
| A mask is used to remove substantially all of the first order diffraction components of a reflected light beam which are generated as the beam crosses grooved data tracks in an optical media. The mask may comprise a transparent substrate with an opaque layer having a pair of circular |
| 5202875 |
Multiple data surface optical data storage system |
April 13, 1993 |
| An optical data storage system comprises a multiple data surface medium and optical head. The medium comprises a plurality of substrates separated by a light transmissive medium. Data surfaces are located on the substrate surfaces which lie adjacent a light transmissive medium. The data |
| 5166989 |
Integrated polarization detection system |
November 24, 1992 |
| A substrate has a pair of overlapping optical couplers for separately coupling a first and a second polarization component of a light beam into a first and a second waveguide channel. The channels are oriented with their longitudinal axis approximately perpendicular to each other. A firs |
| 5031993 |
Detecting polarization state of an optical wavefront |
July 16, 1991 |
| An improved apparatus and method for detecting the polarization state of an optical wavefront is disclosed, which is especially suitable for use in an integrated magneto-optic recording head. An optically transparent waveguide structure transmits TE and TM modes of the wavefront propagat |
