发明授权
- 专利标题： Objective lens, optical head and optical information recording/reproducing apparatus
- 专利标题（中）： 物镜，光头和光信息记录/重放装置
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申请号： US10663596申请日： 2003-09-16
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公开(公告)号： US07272101B2公开(公告)日： 2007-09-18
- 发明人: Masanari Mohri , Yoshiaki Komma , Hiroshi Yamamoto
- 申请人： Masanari Mohri , Yoshiaki Komma , Hiroshi Yamamoto
- 申请人地址： JP Osaka
- 专利权人： Matsushita Electric Industrial Co., Ltd.
- 当前专利权人： Matsushita Electric Industrial Co., Ltd.
- 当前专利权人地址： JP Osaka
- 代理机构： Hamre, Schumann, Mueller & Larson, P.C.
- 优先权： JP2002-308230 20021023
- 主分类号： G11B7/00
- IPC分类号： G11B7/00 ; G02B27/02
摘要：
A light beam emitted from a light source is focused by an objective lens onto an information recording surface of an optical information recording medium. The objective lens has a substantially truncated-cone-shaped portion on its surface on the side of the optical information recording medium. This makes it possible to prevent interference with a DVD-RAM cartridge and ensure optical compatibility with a BD and a DVD.
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