G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/125 (2006.01) G11B 7/13 (2006.01) G11B 7/00 (2006.01) G11B 7/0037 (2006.01) G11B 7/09 (2006.01) G11B 7/135 (2006.01)
Patent
CA 2189719
A laser diode applies a laser beam through a grating, a beam splitter, and an objective to a compact disc. A laser beam reflected by the compact disc is applied through the objective and the beam splitter to a photodiode. The objective has a large numerical aperture of 0.6 in order to be able of play back a digital video disc that has a thin substrate and contains information recorded at a high density. To prevent the photodiode from suffering aberrations caused due to the large numerical aperture of the objective, the photodiode has a relatively small photodetector unit having a normalized detector size ranging from 3 µm to 16 µm, for detecting only returning light up to a numerical aperture of 0.3 and not detecting light of greater numerical aperture values.
Uemura Kamon
Yamakawa Akio
Gowling Lafleur Henderson Llp
Sony Corporation
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