Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
1997-09-26
2001-07-03
Careca, John W. (Department: 2752)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S044120, C369S044370, C369S094000
Reexamination Certificate
active
06256283
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 need to be recorded onto a plurality of optical recording mediums different in recording density and/or medium-thickness from each other and/or to be read out from the different optical recording mediums, a plurality of optical system each of which includes a light beam source, a collimator, a light beam splitter, a quarter-wave plate, and an objective 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 with a minimized size and a simplified structure.
According to the present invention, the optical pickup device comprises a single light beam path toward an optical recording medium (the single light beam path may include, for example, a single quarter-wave plate and/or a single collimator and/or a single objective) to be used for treating or passing optically a plurality of kinds of light beams (different from each other in, for example, wavelength) for respective recording densities and/or recording-medium-thicknesses, that is, the optical pickup device according to the present invention has the single light beam path for common use in treating or passing either of the plurality of kinds of light beams for respective recording densities and/or recording-medium-thicknesses different from each other, in other words, at least one or either of the plurality of kinds of light beams is introduced into the common single light beam path which may includes the single quarter-wave plate and/or single collimator and/or single objective.
Since the quarter-wave plate and/or the collimator and/or the objective is used in both of the optical treatings or passings of the plurality of different kinds of light beams for respective recording densities and/or recording-medium-thicknesses different from each other, that is, a number of the quarter-wave plate and/or the collimator and/or the objective necessary for the optical treatings of the plurality of different kinds of light beams is minimized, a size of the optical pickup device for the recording densities and/or recording-medium-thicknesses different from each other is minimized.
Further, since the single light beam path is used in both of the optical passings of the plurality of different kinds of light beams for respective recording densities and/or recording-medium-thicknesses different from each other, a structure of the optical pickup device is simplified, and the size of the optical pickup device for the recording densities and/or recording-medium-thicknesses different from each other is minimized.
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Fukakusa Masaharu
Ito Seigi
Kono Haruhiko
Mori Taiichi
Nakashima Kazuyuki
Careca John W.
Chu Kim-Kwok
Matsushita Electric - Industrial Co., Ltd.
Stevens Davis Miller & Mosher LLP
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