| Patent Number |
Title Of Patent |
Date Issued |
| 7773490 |
Optical compensator for use in an optical scanning device |
August 10, 2010 |
| An optical compensator is included in an optical scanning device for scanning optical record carriers. There are at least two different information layer depths within two different carriers. The scanning device produces first to third radiation beams respectively having different wa |
| 7742381 |
Optical scanning device |
June 22, 2010 |
| The invention relates to an optical scanning device for scanning in a first mode a first information layer (111) of an information carrier and in a second mode a second information layer (112) of the information carrier. The optical scanning device comprises a radiation source (101) |
| 7701832 |
Optical record carrier scanning device |
April 20, 2010 |
| An optical scanning device scans optical record carriers, such as three optical record carriers, where each optical record carrier has an information layer having a depth which is different from the information layer depth of other optical record carriers, where d.sub.3<d.sub.2< |
| 7099254 |
Optical scanning device |
August 29, 2006 |
| An optical scanning device for scanning an optical record carrier includes a radiation source and a beam splitter arranged to pass a first portion of the source beam to the record carrier, and a second portion to an intensity sensor. A signal detector is arranged in the path of the beam |
| 6894968 |
Optical wavefront modifier including a series arrangement of transparent resistors between elect |
May 17, 2005 |
| An optical wavefront modifier (27) is adapted for modifying a wavefront of an optical beam passing through the modifier. The modifier comprises a first and a second transparent electrode layer (42', 43') and a flat medium (46) for modifying the wavefront in dependence on electrical e |
| 6650613 |
Optical scanning device |
November 18, 2003 |
| An optical scanning device for scanning a recordable optical disk (20) with a laser beam having a linear polarisation. A quarter wave plate (16) is used to alter the polarisation of the beam on reflection from the disk. A partially polarising beam splitter (8) is used and arranged such t |
| 6596984 |
Optical scanning unit comprising a detection system for detecting the position of a movable elem |
July 22, 2003 |
| In an optical unit for scanning an information plane having a track structure by means of a scanning spot, which unit is provided with a pivotable mirror for fast movement of the scanning spot perpendicular to the track direction, the angular position of the mirror is determined by m |
| 6586717 |
Optical scanning head |
July 1, 2003 |
| An optical head scans the information layer (3) of an optical record carrier (1) by means of a radiation beam (13). Optical aberrations in the beam such as coma and spherical aberration, caused by tilt and thickness variations in the optical disc respectively, are compensated by an a |
| 6496452 |
Optical scanning with aberration correction |
December 17, 2002 |
| An optical head scans the information layer (3) of an optical record carrier (1) by means of a radiation beam (13). Optical aberrations in the beam such as coma and spherical aberration, caused by tilt and thickness variations in the optical disc respectively, are compensated by an a |
| 6449236 |
Optical wavefront modifier |
September 10, 2002 |
| An optical wavefront modifier modifies a wavefront of an optical beam passing through the modifier. The modifier comprises a first and a second transparent electrode layer and a flat medium for modifying the wavefront depending on electrical excitation of the medium and arranged between |
