Optical head

Details Optical head Optical head

1998-01-30

1999-11-02

Cabeca, John W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4424, 369 94, 369103, 369116, G11B 712

Patent

active

059783460

ABSTRACT:
An optical head has a light source; luminous flux splitting means for splitting radiation luminous flux of linearly polarized light radiated from the light source into plural luminous fluxes without changing the luminous flux diameter substantially; a wavelength plate for polarizing at least one of the luminous fluxes split by the luminous flux splitting means into a nearly circularly polarized light as illumination luminous flux; an objective lens for converging the illumination luminous flux through the wavelength plate on an optical information medium and collecting the reflected light; and a photodetector for receiving the reflected luminous flux collected by the objective lens after passing through the wavelength plate and the luminous flux splitting means. The quantity of received light for maintaining the S/N ratio is sufficient for reproducing a high density optical disk and a conventional optical disk with a large birefringence.

REFERENCES:
patent: 5665957 (1997-09-01), Lee et al.
patent: 5703856 (1997-12-01), Hayashi et al.
patent: 5703862 (1997-12-01), Lee et al.
patent: 5754512 (1998-05-01), Komma et al.
patent: 5768251 (1998-06-01), Ito et al.

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