Optical pickup device

Details Optical pickup device Optical pickup device

1997-09-26

2001-07-24

Neyzari, Ali (Department: 2752)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044120, C369S044230, C369S044370, C369S094000, C369S122000

Reexamination Certificate

active

06266314

ABSTRACT:

BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT
The present invention relates to an optical pickup for recording information onto an optical recording medium and/or reading out the information from the optical recording medium.
In the prior art, when information needs to be recorded onto a plurality of optical recording media different in recording density and/or medium-thickness from each other and/or to be read out from the different optical recording media, a plurality of optical systems each of which includes a light beam source, a collimator, a light beam splitter, a quarter-wave plate, and an objective lens for respective recording density and/or medium-thickness are used.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an optical pickup device for recording media having recording densities and/or recording-medium-thicknesses that are different from each other, wherein a size of the optical pickup device is minimized.
An optical pickup device according to the present invention has a single light beam path in which at least one or either of a plurality of kinds of light beams (different from each other in, for example, wavelength) for the respective recording densities and/or recording-media-thicknesses proceeds toward a surface of an optical recording medium and proceeds to a light beam detector after being reflected by the surface.
Since the at least one or either of the plurality of kinds of light beams proceeds in the single light beam path in opposite directions, in other words, the single light beam path is used to pass the plurality of kinds of light beams in the opposite directions, a structure and volume between the optical recording medium and light beam emitting elements may be small to minimize the size of the optical pickup device.


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