Optical data recording/reproducing apparatus

Details Optical data recording/reproducing apparatus Optical data recording/reproducing apparatus

1994-08-26

1996-02-27

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 90, 369116, G11B 700

Patent

active

054954649

ABSTRACT:
In an optical data recording/reproducing apparatus for performing write and read operations of data by irradiating laser light onto an optical data recording medium, in order to reduce noise of a semiconductor laser, an HF oscillator is provided to superpose an HF current on a drive current to be applied to the semiconductor laser. The HF oscillator is housed in a conductive shield case together with the semiconductor laser. An LC low-pass filter is also provided in a signal line connecting the components inside and outside the shield case to prevent undesired radiation of the HF current. A write drive line and a read drive line of the semiconductor laser are separated in the shield case, and the write drive line is disconnected from the HF oscillator in at least a read mode.

REFERENCES:
patent: 4107478 (1978-08-01), Takahashi et al.
patent: 5307337 (1994-04-01), Woloszczuk
patent: 5335213 (1994-08-01), Fukomoto et al.
patent: 5363365 (1994-11-01), Ajima

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