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    • 21. 发明专利
    • Optical disk
    • 光盘
    • JP2003022568A
    • 2003-01-24
    • JP2001204906
    • 2001-07-05
    • Hitachi Maxell Ltd日立マクセル株式会社
    • FUJIKAWA KAZUHIRO
    • G11B7/24G11B7/26
    • G11B7/24003
    • PROBLEM TO BE SOLVED: To provide an optical disk wherein double refraction in a substrate inner peripheral side is small even when a stamper inner diameter is small, 22 mm to 23 mm. SOLUTION: A groove 130 by a stamper pressing claw or an information recording area 140 by a step and a stamper is formed on one plane of a plastic transparent substrate 100. In a surface opposite the stamper information surface and in an area between the groove 130 by the stamper pressing claw or the step and the information recording area 140, a step part 120 is formed to be extended continuously or intermittently along the peripheral surface of the plastic transparent substrate.
    • 要解决的问题:为了提供即使在压模内径小的情况下,基板内周侧的双折射也很小的光盘,即22mm〜23mm。 解决方案:在塑料透明基板100的一个平面上形成由压模爪或通过台阶和压模的信息记录区域140的凹槽130.在压模信息表面相对的表面和凹槽130之间的区域 通过压模爪或台阶和信息记录区域140,台阶部分120形成为沿着塑料透明基板的圆周表面连续地或间断地延伸。
    • 29. 发明专利
    • Method and device for reducing contraction of clamp part of optical disk, and optical disk thereby obtained
    • 用于减少光盘夹部分合同的方法和装置以及获得的光盘
    • JP2003077182A
    • 2003-03-14
    • JP2002234033
    • 2002-08-09
    • Wea Mfg Incウェア マニュファクチャリング インコーポレイティド
    • MYRTLE JAMES
    • G11B7/26G11B7/24G11B23/00
    • G11B7/24003G11B7/24G11B23/0035
    • PROBLEM TO BE SOLVED: To provide a method and a device for reducing the contraction of the clamp part of an optical disk, wherein a distortion is reduced and efficient production is carried out.
      SOLUTION: The improved optical disk has a substantially transparent substrate, and includes an optical data structure constituted of a pit and a land in the outside of the clamp area of a disk on its one surface. In the clamp area, a protruded part structure is provided to protrude from a first surface, and accordingly a thickness for a clamp is provided, which is thicker than the thickness of the other part of the disk. Only a part of the clamp area is covered with the protruded part, thereby ensuring a thickness equivalent to that of a disk having thick clamp area. To reduce distortion generated by the contraction of a material, the amount of a material used for forming the protruded part is set less than 5% of the amount of a material used for forming the other clamp area.
      COPYRIGHT: (C)2003,JPO
    • 要解决的问题:提供减少光盘的夹紧部分的收缩的方法和装置,其中减小了变形并且执行了有效的生产。 解决方案:改进的光盘具有基本上透明的基板,并且包括在其一个表面上的盘的夹紧区域的外部由凹坑和焊盘构成的光学数据结构。 在夹紧区域中,设置有从第一表面突出的突出部分结构,因此提供了比盘的另一部分的厚度更厚的夹具的厚度。 只有夹紧区域的一部分被突出部分覆盖,从而确保与具有较厚夹紧区域的盘的厚度相当的厚度。 为了减少由材料收缩产生的变形,用于形成突出部分的材料的量被设定为用于形成另一个夹紧区域的材料的量的5%。