Title:
OPTICAL PICKUP AND OPTICAL DISC DRIVE
Document Type and Number:
WIPO Patent Application WO/2005/048249
Kind Code:
A1
Abstract:
An optical pickup for an optical recording medium (1) having a plurality of recording faces (1a, 1b), wherein a light source, having a plurality of laser light emitting sections (a, b) that are provided for respective recording faces (1a, 1b) and adjusted and set in the mutual positions in the direction of optical axis such that spherical aberration does not occur due to the optical characteristics of laser light being applied to the corresponding recording face (1a, 1b) through a common objective lens (8), is provided. Since recording or reproducing operation can be carried out using the light emitting section (a, b) corresponding to the recording face (1a, 1b), a good recording or reproducing operation can be realized using a small and low-cost optical system as compared with that employing a wave aberration correction element, e.g. a liquid crystal element.
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Inventors:
ABE ISSEI (JP)
Application Number:
PCT/JP2004/010662
Publication Date:
May 26, 2005
Filing Date:
July 27, 2004
Export Citation:
Assignee:
RICOH KK (JP)
ABE ISSEI (JP)
ABE ISSEI (JP)
International Classes:
G11B7/12; G11B7/123; G11B7/125; G11B7/127; G11B7/135; H01S5/02; H01S5/40; G11B7/00; (IPC1-7): G11B7/135; G11B7/125
Foreign References:
| JPH04243024A | 1992-08-31 | |||
| JP2004241088A | 2004-08-26 |
Attorney, Agent or Firm:
Itoh, Tadahiko (Yebisu Garden Place Tower 20-3, Ebisu 4-chom, Shibuya-ku Tokyo 32, JP)
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