Light emitter-receiver device and optical reading system
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United States of America Patent
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Feb 16, 1999
Grant Date -
N/A
app pub date -
Oct 16, 1996
filing date -
Oct 17, 1995
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Abstract
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.
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