Invention Grant
- Patent Title: Objective lens, optical head, and optical pickup apparatus
- Patent Title (中): 物镜，光头和光学拾取装置
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Application No.: US11547686Application Date: 2005-03-24
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Publication No.: US07656774B2Publication Date: 2010-02-02
- Inventor: Katsuya Sakamoto
- Applicant: Katsuya Sakamoto
- Applicant Address: JP Tokyo
- Assignee: Konica Minolta Opto, Inc.
- Current Assignee: Konica Minolta Opto, Inc.
- Current Assignee Address: JP Tokyo
- Agency: Cohen Pontani Lieberman & Pavane LLP
- Priority: JP2004-116269 20040409
- International Application: PCT/JP2005/005316 WO 20050324
- International Announcement: WO2005/098838 WO 20051020
- Main IPC: G11B7/00
- IPC: G11B7/00
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.
Public/Granted literature
- US20070211605A1 Objective Lens, Optical Head, and Optical Pickup Apparatus Public/Granted day:2007-09-13
Information query
IPC分类:
