Optical head device to maximize the effective diameter of an obj

Details Optical head device to maximize the effective diameter of an obj Optical head device to maximize the effective diameter of an obj

1996-10-18

1998-10-13

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, G11B 700

Patent

active

058222952

ABSTRACT:
Disclosed is an optical head device which has: a laser light source; an objective lens to which light emitted from the laser light source is entered through a beam splitter and in which the light is collected to be focused as a very small spot on a recording surface of an optical disk medium; an optical detector to which modulated light reflected on the recording surface of the optical disk medium is entered through the objective lens and the beam splitter; and a shading plate which is located between the laser light source and the beam splitter and through which a central part of the light emitted from the laser light source is passed; wherein the objective lens is designed to have an effective diameter greater than a diameter of the laser light output from the beam splitter.

REFERENCES:
patent: 4411500 (1983-10-01), Yonezawa et al.
patent: 5155718 (1992-10-01), Hashimoto et al.
patent: 5293366 (1994-03-01), Ohta
patent: 5555232 (1996-09-01), Kobayashi et al.

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