Title:
対物レンズ、光ヘッド、及び光ピックアップ装置
Document Type and Number:
Japanese Patent JP4539651
Kind Code:
B2
Abstract:
An objective lens for at least one of recording and reproducing for an optical information recording medium includes in the order from a light source side: a first lens group having negative refracting power, which is in a meniscus shape having a concave surface facing the light source side; a second lens group having positive refracting power; and a third lens group having positive refracting power, which is in a meniscus shape having a concave surface facing an image side.
Inventors:
Katsuya Sakamoto
Application Number:
JP2006512002A
Publication Date:
September 08, 2010
Filing Date:
March 24, 2005
Export Citation:
Assignee:
Konica Minolta Opto Co., Ltd.
International Classes:
G11B7/135; G02B9/12; G02B13/00; G02B13/18; G02B13/24; G11B7/1374; G11B7/1392; G11B7/1372
Domestic Patent References:
| JPH06138384A | 1994-05-20 | |||
| JPS63106713A | 1988-05-11 | |||
| JPS6091317A | 1985-05-22 | |||
| JPS59176715A | 1984-10-06 | |||
| JP2003084196A | 2003-03-19 |