Optical head

Details Optical head Optical head

1998-01-29

2000-08-29

Edun, Muhammad

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369 4424, G11B 709

Patent

active

061118427

ABSTRACT:
An optical head has a light source for emitting a light beam; optical device for condensing the emitted light beam onto an information recording medium and condensing light reflected from the information recording medium; and aperture limitation device for, of the condensed reflected light, causing light of a predetermined outer region to exit in a position different from a position where light of an inner region exits, wherein the light of the outer region and the light of the inner region caused to exit by the aperture limitation devices are separated to different places.

REFERENCES:
patent: 5798994 (1998-08-01), Kamatani
patent: 5802036 (1998-09-01), Ohba et al.

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