2-laser optical head and recording/reproducing apparatus

Details 2-laser optical head and recording/reproducing apparatus 2-laser optical head and recording/reproducing apparatus

1993-10-18

1996-02-20

Nguyen, Tan T.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4437, 369 4438, 369 4423, G11B 712

Patent

active

054935547

ABSTRACT:
A 2-laser optical head in which the number of optical parts is small and an arrangement is also simple and a whole optical system can be miniaturized. As a construction to realize the 2-laser optical head, there is a construction in a 2-laser optical head comprising at least: semiconductor laser devices for rewriting and reproducing; a beam splitter for transmitting a laser beam emitted from the reproducing semiconductor laser device and for reflecting a laser beam emitted from the rewriting semiconductor laser device; an objective lens for converging the laser beams and irradiating onto a recording surface of a magneto-optic disk, thereby forming a spot for reproduction and a spot for rewriting; a detection optical system for detecting a reflected light from the recording surface of the spot; and a detection optical system for detecting a reflected light from the recording surface of the spot, wherein a dichroism beam splitter is arranged in a manner such that the angles between normal vectors of incident surfaces and incident optical axes and are equal to 45.degree., and the occurrence of a phase difference which causes a deterioration of a deflecting state is corrected by a beam splitter.

REFERENCES:
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patent: 4621353 (1986-11-01), Hazel et al.
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patent: 5068843 (1991-11-01), Takeshita et al.
patent: 5070494 (1991-12-01), Emoto et al.
patent: 5249171 (1993-09-01), Matsubayashi et al.
patent: 5295125 (1994-03-01), Oonishi et al.
"3-Beam Overwritable Magneto-Optic Disk Drive", Watabe, et al.

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