Optical pick-up device

Details Optical pick-up device Optical pick-up device

1996-02-12

1998-01-27

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, G11B 700

Patent

active

057128421

ABSTRACT:
There is provided an optical pick-up device capable of eliminating a spherical aberration due to a thickness error of an optical disc. The optical pick-up device includes a convex lens having a flat surface opposed to a surface of an optical recording medium, and having a predetermined refractive index, and an objective lens disposed such that the convex lens is interposed between said optical recording medium and the objective lens. A position-detecting means detects a position relation between the light-incident surface of the optical recording medium and the flat surface of the convex lens, based on first and second detection signals. A drive means drives the convex lens along an optical axis thereof such that the convex lens is caused to move in the opposite directions toward the optical recording medium or the objective lens, whereby a distance between the light-incident surface of the optical recording medium and the flat surface of the convex lens is controlled based on the first and second detection signals.

REFERENCES:
patent: 4610515 (1986-09-01), Tanaka
patent: 5058091 (1991-10-01), Murao et al.
patent: 5631885 (1997-05-01), Brazas, Jr.
patent: 5638221 (1997-06-01), Maruyama et al.

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