Controlling a laser used with an optical disk apparatus

Details Controlling a laser used with an optical disk apparatus Controlling a laser used with an optical disk apparatus

1992-01-07

1992-10-06

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

G11B 700

Patent

active

051538717

ABSTRACT:
During playback of data from a recording medium, a light source emitting a light beam incident on the recording medium is driven by a first drive circuit. During this time, a first control circuit produces a control signal to the first driving circuit and controls the first drive circuit such that a power of the light beam is kept constant. During recording of data, on the other hand, a second drive circuit supplies a drive current in superimposition on a drive current from the first drive circuit with a timing corresponding to the recording data. During this time, the control of the first drive circuit by the first control circuit is inhibited. However, the control signal immediately before the inhibition is held, and hence the light source is continually driven by the first drive circuit. Thus, only a single reference level is necessary for the power control, permitting a simplification of the construction and cost reduction of the apparatus.

REFERENCES:
patent: 4685097 (1987-08-01), Van der Put
patent: 4698797 (1987-10-01), Komatsu
patent: 4785443 (1988-11-01), Minami et al.
patent: 4858220 (1989-08-01), Funada

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