发明申请
US20070230311A1 DIFFRACTION ELEMENT, OBJECTIVE LENS UNIT, OPTICAL PICKUP AND OPTICAL DISC APPARATUS
失效
衍射元件，目标透镜单元，光学拾取器和光盘设备
- 专利标题： DIFFRACTION ELEMENT, OBJECTIVE LENS UNIT, OPTICAL PICKUP AND OPTICAL DISC APPARATUS
- 专利标题（中）： 衍射元件，目标透镜单元，光学拾取器和光盘设备
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申请号： US11684133申请日： 2007-03-09
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公开(公告)号： US20070230311A1公开(公告)日： 2007-10-04
- 发明人: Satoshi Kawakita , Motoo Aiba , Kyu Kanno , Jin Sato , Takatoshi Yamada
- 申请人： Satoshi Kawakita , Motoo Aiba , Kyu Kanno , Jin Sato , Takatoshi Yamada
- 申请人地址： JP Tokyo
- 专利权人： SONY CORPORATION
- 当前专利权人： SONY CORPORATION
- 当前专利权人地址： JP Tokyo
- 优先权： JP2006-098706 20060331
- 主分类号： G11B7/00
- IPC分类号： G11B7/00
摘要：
A diffraction element for diffracting a particular wavelength of incident optical beam includes: a base section made from a first resin and provided with a predetermined diffraction pattern; and a cover section made from a second resin and covering the diffraction pattern, wherein a rate of change of refraction index of the first resin is substantially the same as a rate of change of refraction index of the second resin in a temperature range between a first temperature and a second temperature.
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