Title:
光ピックアップ装置
Document Type and Number:
Japanese Patent JP4803235
Kind Code:
B2
Abstract:
In the invention, a movable lens (15) varying the rate of convergence or divergence of light reaching an objective lens (17) by moving in an optical axis direction has its position adjusted to correspond to ambient temperature. The objective lens (17) is arranged to be tilted with respect to an optical axis of light reaching the objective lens (17) from the movable lens (15). First coma aberration of which the amount produced varies according to movement of the movable lens (15), and second coma aberration of which the amount produced varies due to variation in the warping state of an optical disc that is caused along with variation in ambient temperature both occur in the radius direction of the optical disc, and the objective lens (17) has its tilting direction adjusted such that the first coma aberration and the second coma aberration have their increasing and decreasing directions of the amount of coma aberration produced with respect to variation in ambient temperature reversed.
Inventors:
Tanabe Wakaho
Application Number:
JP2008261259A
Publication Date:
October 26, 2011
Filing Date:
October 08, 2008
Export Citation:
Assignee:
Funai Electric Co., Ltd.
International Classes:
G11B7/135; G11B7/095
Domestic Patent References:
| JP2008186537A |
Foreign References:
| WO2006006381A1 |
Attorney, Agent or Firm:
Shizuo Sano
Inoue On
Takeshi Saito
Inoue On
Takeshi Saito