Invention Grant
- Patent Title: Objective lens, optical pickup apparatus, and optical information recording reproducing apparatus
- Patent Title (中): 物镜，光学拾取装置和光学信息记录再现装置
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Application No.: US13236302Application Date: 2011-09-19
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Publication No.: US08310909B2Publication Date: 2012-11-13
- Inventor: Kentarou Nakamura
- Applicant: Kentarou Nakamura
- Applicant Address: JP Tokyo
- Assignee: Konica Minolta Opto, Inc.
- Current Assignee: Konica Minolta Opto, Inc.
- Current Assignee Address: JP Tokyo
- Agency: Cozen O'Connor
- Priority: JP2009-112918 20090507; JP2009-112919 20090507; JP2009-148535 20090623; JP2010-050599 20100308
- Main IPC: G11B7/00
- IPC: G11B7/00
Abstract:
An objective lens relating to the present invention includes a first optical path difference providing structure in which a first basic structure and a second basic structure are overlapped with each other. The first basic structure is a blaze-type structure which emits a Xth-order diffracted light flux, when the first light flux passes through the first basic structure, where the value of X is an odd integer. At least a part of the first basic structure arranged around an optical axis includes a step facing an opposite direction to the optical axis. The second basic structure is a blaze-type structure which emits a Lth-order diffracted light flux, when the first light flux passes through the second basic structure, where the value of L is an even integer. At least a part of the second basic structure arranged around the optical axis includes a step facing the optical axis.
Public/Granted literature
- US20120008485A1 Objective Lens, Optical Pickup Apparatus, and Optical Information Recording Reproducing Apparatus Public/Granted day:2012-01-12
Information query
IPC分类:
