Apparatus for focusing a light beam onto an information memory m

Details Apparatus for focusing a light beam onto an information memory m Apparatus for focusing a light beam onto an information memory m

1988-11-29

1991-01-01

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, 369 56, 369 4432, G11B 700

Patent

active

049823973

ABSTRACT:
In the initial operation phase of a data recording apparatus, a controller detects the output signal of a position detector, thus determining whether or not a data objective lens of an optical head is facing the non-storage region of an optical disk. If the lens faces the data non-storage region, the controller turns on a semiconductor laser, whereby the laser emits a laser beam onto the disk. The lens is moved in its axial direction, thereby focusing the beam. The beam emitted from the laser is detected by photodetectors. If this beam is too intense, the controller turns off the laser.

REFERENCES:
patent: 4499571 (1985-02-01), Yokota
patent: 4570251 (1986-02-01), Yokota et al.
patent: 4669077 (1987-05-01), Gerard et al.
patent: 4754460 (1988-06-01), Kimura et al.
patent: 4858219 (1989-08-01), Yoshikawa et al.

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