G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/125 (2006.01) G11B 7/12 (2006.01) G11B 7/13 (2006.01) G11B 7/135 (2006.01) H01S 5/026 (2006.01) G11B 7/09 (2006.01)
Patent
CA 2188006
The disclosure relates to a laser (L) and to at least one detector integrated side by side on one and the same substrate so that the laser emits, through the edge of the device, a light beam along a direction and so that the detector can detect, through the same edge of the device, a beam substantially parallel to this direction of emission. In a system for the optical reading of a recording medium, the light emitted is reflected by the medium to be read to the detector or detectors. A diffraction grating (RZ) that diffracts only diffraction waves with the same sign (positive for example) deflects at least a part of the light to the detector or detectors. Application to the reading of optical disks.
Lehureau Jean-Claude
Renaud Jean-Charles
Goudreau Gage Dubuc
Thomson-Csf
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