Optical head and an optical disk apparatus

Details Optical head and an optical disk apparatus Optical head and an optical disk apparatus

1998-05-29

2000-07-04

Edun, Muhammad

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4414, 369 4437, 369 94, G11B 709

Patent

active

060848456

ABSTRACT:
An optical head has a first light source; a second light source; a transmitting and reflecting element having a first surface and a second surface, and used to reflect diverging light from the first light source at the first surface, and to allow diverging light from the second light source to enter the second surface and to go out from the first surface, thereby to synthesize optical paths; an objective lens for converging light from the transmitting and reflecting element on an information recording surface of an optical disk and for condensing light reflected from the disk; and a photo-detector for receiving the reflected light, wherein the first surface and the second surface of the transmitting and reflecting element are not parallel to each other in order to decrease aberration when the diverging light from the second light source passes through the transmitting and reflecting element.

REFERENCES:
patent: 5235581 (1993-08-01), Miyagawa et al.
patent: 5703856 (1997-12-01), Hayashi et al.
patent: 5982732 (1999-11-01), Yamanaka
European Search Report for Int'l Appln No. 98109896 dated Dec. 9, 1998.

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