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公开(公告)号:US6054199A
公开(公告)日:2000-04-25
申请号:US155988
申请日:1999-02-08
申请人: Toshinori Sugiyama , Masashi Suenaga , Hitoshi Watanabe , Shinitsu Kinoshita , Hirofumi Sukeda , Hisataka Sugiyama
发明人: Toshinori Sugiyama , Masashi Suenaga , Hitoshi Watanabe , Shinitsu Kinoshita , Hirofumi Sukeda , Hisataka Sugiyama
IPC分类号: G11B7/007 , G11B7/09 , G11B7/24079 , G11B11/105 , B32B3/00
CPC分类号: G11B7/24079 , G11B7/0938 , G11B11/10578 , Y10S428/913 , Y10S430/146 , Y10T428/21
摘要: A high density optical recording medium having wide-width grooves capable of reliable tracking is provided. The optical recording medium is formed with the wide-width grooves 12 in which a width g of the groove 12 is larger than a width L of a land between the grooves. The lands 11 and the grooves 12 are formed so that a track pitch Tp is less than 1 .mu.m, and a land height h from a groove bottom surface 13 satisfies [(.lambda./(8n)).multidot.Ltan.theta.]/[Ltan.theta.-(.lambda./(8n))].ltoreq.h.ltoreq.[(.lambda./(5n)).multidot.Ltan.theta.]/[Ltan.theta.-(.lambda./(5n))] with respect to a wavelength .lambda. of a reproducing light beam and a refractive index n of a substrate. An angle of inclination of a groove side wall is represented by .theta., and the refractive index of the substrate is represented by n. Even when the width L and the height h of the land is changed due to any optical blur, the disturbance of diffracted light from a land shoulder 19 is suppressed, making it possible to obtain a stable track position control signal.
摘要翻译: PCT No.PCT / JP97 / 01230 Sec。 371日期1999年2月8日 102(e)1999年2月8日PCT PCT 1997年4月10日PCT公布。 第WO97 / 38421号公报 日期1997年10月16日提供了具有能够可靠跟踪的宽幅凹槽的高密度光学记录介质。 光记录介质形成有宽槽12,其中槽12的宽度g大于槽之间的焊盘的宽度L。 焊盘11和槽12形成为轨道间距Tp小于1μm,并且从槽底面13的焊盘高度h满足[(λ/(8n))×Ltanθ/ [Ltanθ- (λ/(8n))] = h = [(λ/(5n))xLtanθ/ [Ltanθ-(λ/(5n))] 和基板的折射率n。 槽侧壁的倾斜角由θ表示,衬底的折射率由n表示。 即使当由于任何光学模糊而改变焊盘的宽度L和高度h时,也会抑制来自焊台肩19的衍射光的干扰,从而可以获得稳定的轨道位置控制信号。
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公开(公告)号:US5180595A
公开(公告)日:1993-01-19
申请号:US892479
申请日:1992-06-02
申请人: Shinitsu Kinoshita
发明人: Shinitsu Kinoshita
CPC分类号: B29C37/0003 , B29C33/44 , B29C45/263 , B29D17/005 , G11B7/263 , Y10S425/81
摘要: A metal mold for manufacturing a resin substrate useful as a optical recording medium.
摘要翻译: 一种用作制造用作光记录介质的树脂基板的金属模。
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