Output stabilizing apparatus for an optical head

Details Output stabilizing apparatus for an optical head Output stabilizing apparatus for an optical head

1989-10-25

1991-11-19

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

050671170

ABSTRACT:
An output stabilizing apparatus for an optical head having a semiconductor laser, a beam splitter, an optical projection system, a monitor photodiode and an automatic laser power control circuit. A main laser beam emitted from the semiconductor laser is split into two beams by the beam splitter. The monitor photodiode is disposed to receive one of the beams and generates a monitor signal. In response to the monitor signal, the automatic laser power control circuit controls the semiconductor laser intensity.

REFERENCES:
patent: 4516242 (1985-05-01), Yokota
patent: 4580044 (1986-04-01), Hongo et al.
patent: 4712203 (1987-12-01), Saito et al.
patent: 4733398 (1988-03-01), Shibagaki et al.
patent: 4803579 (1989-02-01), Koyama

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