Multiple focal lens multiple focal optical pickup and optical in

Details Multiple focal lens multiple focal optical pickup and optical in Multiple focal lens multiple focal optical pickup and optical in

1997-01-30

1999-03-23

Tran, Thang V.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369109, G11B 700

Patent

active

058869700

ABSTRACT:
A multiple focal lens is provided with: a diffraction element having a light incident surface and a light outgoing surface for diffracting a light beam incident from the external to the light incident surface and generating a plurality of diffraction light beams from the light outgoing surface; a light condense element for condensing the generated diffraction light beams respectively onto a plurality of focal points different in position from each other; and a main body for holding said diffraction element and said light condense element. A central axis of said diffraction element and a central axis of said light condense element are offset to each other such that one optical path of one reflection light, which is used for reproducing information, among a plurality of reflection lights of the condensed diffraction light beams reflected from an information record medium on which the information to be reproduced is recorded, and the other optical paths of the other reflection lights among the plurality of reflection lights are offset to each other.

REFERENCES:
patent: 5526336 (1996-06-01), Park et al.
patent: 5526338 (1996-06-01), Hasman et al.

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