Objective lens device, optical pickup adopting the same and meth

Details Objective lens device, optical pickup adopting the same and meth Objective lens device, optical pickup adopting the same and meth

1997-02-14

1999-05-11

Edun, Muhammad N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4412, 369 4423, 369 93, G11B7/00

Patent

active

059035366

ABSTRACT:
An objective lens for reproducing/recording information from/onto discs having different thicknesses and an optical pickup device adopting the same. The objective lens device includes an objective lens provided along a light path facing a plane of a disc and having a predetermined effective diameter, and a light controller provided along the light path for controlling the light of an incident light beam between near and far axes of the objective lens, wherein the central portion of the objective lens corresponding to the near-axis region of the incident light beam has the optimum curvature and aspherical coefficient for both thick and thin discs. Therefore, the objective lens device is simplified and inexpensive. Also, the objective lens device can be used for discs of different thicknesses in a single disc drive, by reducing the spherical aberration effect.

REFERENCES:
patent: 4668056 (1987-05-01), Braat et al.
patent: 5349592 (1994-09-01), Ando 372 32

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