Focusing error detecting system for optical head

Details Focusing error detecting system for optical head Focusing error detecting system for optical head

1990-06-01

1992-03-10

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4437, G11B 700

Patent

active

050954725

ABSTRACT:
In a focusing error detecting method for an optical head wherein a laser beam from a laser light source is applied to a magneto-optical recording medium to form an image as a light spot thereon, and a focusing error is detecting according to a reflected light from the magneto-optical recording medium, the focusing error detecting method includes a step of dividing the reflected light from the magneto-optical recording medium into a 0-th order light, a +1-st order light and a -1-st order light by a diffraction grating, a step of applying the +1-st order light and the -1-st order light to a first detector and a second detector, respectively, the first and second detectors being arranged before and behind a beam emitting position of the laser light source, respectively and a step of computing outputs from the first and second detectors to obtain a focusing error signal. It is preferably that the laser light source is a semiconductor laser, and that the first and second detectors are mounted on a chip of the semiconductor laser to form a hybrid construction, thereby making the optical head more compact.

REFERENCES:
patent: 4626679 (1986-12-01), Kuwayama et al.
patent: 4771415 (1988-09-01), Taki

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