Invention Grant
US07715300B2 Diffraction element, objective lens unit, optical pickup and optical disc apparatus
失效
衍射元件，物镜单元，光学拾取器和光盘装置
- Patent Title: Diffraction element, objective lens unit, optical pickup and optical disc apparatus
- Patent Title (中): 衍射元件，物镜单元，光学拾取器和光盘装置
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Application No.: US11684133Application Date: 2007-03-09
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Publication No.: US07715300B2Publication Date: 2010-05-11
- Inventor: Satoshi Kawakita , Motoo Aiba , Kyu Kanno , Jin Sato , Takatoshi Yamada
- Applicant: Satoshi Kawakita , Motoo Aiba , Kyu Kanno , Jin Sato , Takatoshi Yamada
- Applicant Address: JP Tokyo
- Assignee: Sony Corporation
- Current Assignee: Sony Corporation
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2006-098706 20060331
- Main IPC: G11B7/00
- IPC: G11B7/00
Abstract:
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.
Public/Granted literature
- US20070230311A1 DIFFRACTION ELEMENT, OBJECTIVE LENS UNIT, OPTICAL PICKUP AND OPTICAL DISC APPARATUS Public/Granted day:2007-10-04
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