Optical-pick up device using multi-lens holder

Details Optical-pick up device using multi-lens holder Optical-pick up device using multi-lens holder

1994-12-15

1996-03-05

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, 369120, 369 4437, G11B 700

Patent

active

054973660

ABSTRACT:
In an optical pick-up device adapted for detecting light reflected from a disc by using a photo detector to drive an object lens in focus and tracking directions on the basis of a detected signal of the photo detector, a multi-lens for improving sensitivity and accuracy of the photo detector and a multi-lens holder for holding the multi-lens are provided, wherein the multi-lens holder is such a shape that it traverses a first optical path from a light source to a beam and traverses a second optical path from the beam splitter to the photo detector. Thus, adjustment of the spacing between the multi-lens and the photo detector can be facilitated, and the shape of the optical pick-up device itself can be thin and light-weight.

REFERENCES:
patent: 4581728 (1986-04-01), Nakamura et al.
patent: 4656618 (1987-04-01), Kaku et al.
patent: 4669071 (1987-05-01), Minami et al.
patent: 4670869 (1987-06-01), Chen
patent: 4773053 (1988-09-01), Gottfried
patent: 4908813 (1990-03-01), Ojima et al.
patent: 5073884 (1991-12-01), Kobayashi
patent: 5189655 (1993-02-01), Ogata et al.

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