Apparatus and method for recording and reproducing information f

Details Apparatus and method for recording and reproducing information f Apparatus and method for recording and reproducing information f

1996-11-05

1999-02-23

Neyzari, Ali

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 4423, 369112, G11B 2736, G11B 700

Patent

active

058751645

ABSTRACT:
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 .mu.m to 16 .mu.m, for detecting only returning light up to a numerical aperture of 0.3 and not detecting light of greater numerical aperture values.

REFERENCES:
patent: 4079421 (1978-03-01), Kermisch
patent: 4672187 (1987-06-01), Fujita et al.
patent: 5161063 (1992-11-01), Krill et al.

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