Optical focusing in magneto-optic disk system

Details Optical focusing in magneto-optic disk system Optical focusing in magneto-optic disk system

1986-10-06

1988-08-16

Richardson, Robert L.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 46, 369 13, 360114, 250201, G11B 700

Patent

active

047649127

ABSTRACT:
In an optical head, a polarized laser beam is converged by an objective lens onto a magnetooptical disk to which a magnetic field is applied by a magnet unit in recording or erasing mode. The laser beam reflected from the disk is reflected by a half prism, passes through a half wave plate, and is applied to a polarizing beam splitter. The laser beam is splitted into first and second laser beams, which are applied to first and second photodetectors having a same structure, through cylindrical lenses. The detection signals output from the photodetectors are processed into a focusing error signal. The objective lens is moved along its optical axis by a voice coil driver in response to the focusing error signal.

REFERENCES:
patent: 3925603 (1975-12-01), Naruse et al.
patent: 4123652 (1978-10-01), Bouwhuis
patent: 4357533 (1982-11-01), Winslow
patent: 4626679 (1986-12-01), Kuwayama et al.

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