Title:
光ヘッド装置及び光ヘッド装置の製造方法
Document Type and Number:
Japanese Patent JP3791778
Kind Code:
B2
Abstract:
An objective lens (1) for an optical disk, which focuses a light beam from a light source, is designed so that a third-order coma aberration generated when the objective lens is inclined at a unit angle is larger than a third-order coma aberration generated when the optical disk (2) is inclined at the unit angle, mounted on an actuator for inclining the objective lens according to an inclination amount of the optical disk, and used. With this structure, it is possible to obtain an objective lens for an optical disk that has a large numerical aperture and is easy to manufacture and assemble, and in which the third-order coma aberration generated when the optical disk surface is inclined owing to a warp or the like can be corrected by small inclination of the objective lens, so as to reduce a residual astigmatism, which is generated according to the inclination amount, after the correction.
Inventors:
Tomohiko Sasano
Yasuhiro Tanaka
Michihiro Yamagata
Yasuhiro Tanaka
Michihiro Yamagata
Application Number:
JP2001517383A
Publication Date:
June 28, 2006
Filing Date:
July 27, 2000
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
G02B3/02; G02B13/00; G02B13/18; G02B27/00; G11B7/00; G11B7/09; G11B7/095; G11B7/135; G11B7/22
Domestic Patent References:
| JP10228653A | ||||
| JP7272301A |
Attorney, Agent or Firm:
Shiro Ogasawara
Fumio Iwahashi
Tomoyasu Sakaguchi
Hiroki Naito
Fumio Iwahashi
Tomoyasu Sakaguchi
Hiroki Naito
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