发明授权
- 专利标题： Optical recording medium, manufacturing method for optical recording medium, information recording/reproducing method and information recording/reproducing device
- 专利标题（中）： 光记录介质，光记录介质的制造方法，信息记录/再现方法和信息记录/再现装置
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申请号： US13236812申请日： 2011-09-20
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公开(公告)号： US08259551B2公开(公告)日： 2012-09-04
- 发明人: Yoshiaki Komma , Joji Anzai
- 申请人： Yoshiaki Komma , Joji Anzai
- 申请人地址： JP Osaka
- 专利权人： Panasonic Corporation
- 当前专利权人： Panasonic Corporation
- 当前专利权人地址： JP Osaka
- 代理机构： Wenderoth, Lind & Ponack, L.L.P.
- 主分类号： G11B7/00
- IPC分类号： G11B7/00
摘要：
An optical recording medium (disk) capable of preventing a back focus at a face thereof and reducing the interference between beams reflected by each recording surface, thereby improving a quality of a servo signal and a reproductive signal. In a disk having (N−1) layers, if N is a natural number (more than three), and if a cover-layer thickness and intermediate-layer thicknesses are d1, d2, . . . dN, then a difference of 1 μm or above is set between the sum of di to dj and the sum of dk to dm for arbitrary natural numbers i, j, k, m (i≦j≦k≦m≦N). If refractive indexes are different from a standard value or different for each layer, then the thickness of each layer is converted based on a spread width of light according to the thickness.
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