Title:
対物レンズ、光ピックアップ装置及び光情報記録再生装置
Document Type and Number:
Japanese Patent JP4404092
Kind Code:
B2
Abstract:
An objective lens according to the present invention is an objective lens used for an optical pickup apparatus, and the objective lens includes a superimposed structure on a surface of a lens with a power in which a first optical path difference providing structure changing spherical aberration in under-corrected direction when a wavelength of an incident light flux becomes longer, and a second optical path difference providing structure changing spherical aberration in over-corrected direction when a wavelength of an incident light flux becomes longer are superimposed.
Inventors:
Toru Kimura
Eiji Nomura
Eiji Nomura
Application Number:
JP2006519651A
Publication Date:
January 27, 2010
Filing Date:
January 31, 2006
Export Citation:
Assignee:
Konica Minolta Opto Co., Ltd.
International Classes:
G11B7/135
Domestic Patent References:
| JP2004264815A | ||||
| JP2004247025A | ||||
| JP2004326861A | ||||
| JP2004362626A |