Optical head

Details Optical head Optical head

1996-11-22

1998-08-04

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369110, G11B 700

Patent

active

057905037

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, 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 on an optical information medium and collecting the reflected light, and a photo detector for receiving the reflected luminous flux, after passing through the wavelength plate and the luminous flux splitting means, wherein supposing a power efficiency when splitting the illumination luminous flux from the radiation luminous flux to be E1, a power efficiency when transmitting a polarized light component of the reflected luminous flux, the component being orthogonal to a direction of polarization of the illumination luminous flux, to the photo detector to be E2, and a power efficiency when transmitting a polarized light component of the reflected luminous flux, the component having substantially same direction as a direction of polarization of the illumination luminous flux, to the photo detector to be E3, the E2 is larger than the E1 and the E1.times.E3 is such amount that can be detected by the photo detector.

REFERENCES:
patent: 5467336 (1995-11-01), Ando et al.
patent: 5513164 (1996-04-01), Tanaka et al.

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