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76 条记录 (耗时 0.022 秒)

    Reproduction apparatus for optical disk
    5.
    发明公开
    Reproduction apparatus for optical disk 失效
    用于光盘再现装置

    公开(公告)号：EP1049078A2

    公开(公告)日：2000-11-02

    申请号：EP00113179.6

    申请日：1997-04-09

    申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

    发明人： Koishi, Kenji ,  Ohara, Shunji ,  Ishida, Takashi ,  Satoh, Isao ,  Takemura, Yoshinari ,  Gushima, Toyoji ,  Deguchi, Hironori ,  Mitui, Yoshitaka

    IPC分类号： G11B7/00 ,  G11B7/007

    CPC分类号： G11B7/24085 ,  G11B7/0053 ,  G11B7/00718 ,  G11B7/00745 ,  G11B7/0079 ,  G11B7/0906 ,  G11B20/1426 ,  G11B27/19 ,  G11B27/24 ,  G11B27/3027 ,  G11B2020/1259 ,  G11B2220/2562

    摘要： An optical disk has a rewritable first recording area and a read-only second recording area. The first recording area includes first tracks composed of groove tracks and land tracks formed on an optical disk substrate alternately in a spiral or concentric shape. Each of the first tracks is divided into a plurality of first sectors, and each of the first sectors includes a first header region having identification data for identifying the first sector and a first data region for recording user data by forming recording marks by changing optical characteristics of a recording surface. The second data recording area includes second tracks formed with physical concave and convex shaped pit rows arranged on the optical disk substrate in a spiral or concentric shape. Each of the second tracks is divided into a plurality of second sectors, and each of the second sectors includes a second header region having identification data for identifying the second sector and a second data region having read-only data recorded as the pit rows. The first header region includes a physical concave and convex shaped first pit row. Each pit of the first pit row has a width in a radial direction of the optical disk substantially equal to a width of the groove track and is wobbled outward or inward from a center line of the groove track by about a quarter of a pitch of the groove track. The second header region includes a physical concave and convex shaped second pit row. Each pit of the second pit row has a width in the radial direction of the optical disk smaller than the width of the groove track and is formed substantially along the center line of the second track.

    High density disk apparatus
    8.
    发明公开
    High density disk apparatus 失效
    Plattengerätvon hoher Dichte。

    公开(公告)号：EP0487296A2

    公开(公告)日：1992-05-27

    申请号：EP91310641.5

    申请日：1991-11-19

    申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

    发明人： Honjo, Masahiro ,  Takemura, Yoshinari

    IPC分类号： G11B20/10 ,  G11B21/00

    CPC分类号： G11B21/003 ,  G11B7/08529 ,  G11B7/14 ,  G11B20/10 ,  G11B20/1258

    摘要： A rotating disk-shape recording medium (1) has, on each of its opposite sides, a recording area which is divided in a radial direction into n recording zones (a₁,a₂,b₁,b₂). A disk apparatus for reproducing information from and/or reproducing information from the recording medium has a first group of n heads (A₁,A₂) disposed to respectively oppose to the n recording zones on one side of the recording medium, and a second group of n heads (B₁,B₂) disposed to respectively oppose to the n recording zones on the other side of the recording medium, each head being movable to scan its corresponding recording zone. A head drive unit (4) causes each of the first group of n heads to move within its corresponding recording zone in a direction from an outer circumference to an inner circumference of the zone and each of the first group of n heads to move within its corresponding recording zone in a direction from an inner circumference to an outer circumference of the zone so that a sum of linear velocities of the first and second groups of n heads is substantially constant. Further, the first group of n heads and the second group of n heads respectively constitute n pairs of heads each being consituted by an i-th head from an outermost head of the first group and an i-th head from an innermost head of the second group ( i = 1 through n) such that a sum of linear velocities of each pair of heads is substantially constant and equal to a sum of linear velocities of another pair of heads.

    摘要翻译： 旋转盘状记录介质在其每个相对侧上具有沿径向被划分为n个记录区（n> / = 2）的记录区域。 用于从记录介质再现信息和/或再现信息的盘装置具有第一组n个头，分别与记录介质的一侧上的n个记录区分别对置，并且分别设置在第二组n个头 与记录介质另一侧的n个记录区相对，每个磁头可移动以扫描其对应的记录区。 头驱动单元使得第一组n个头中的每一个在其相应的记录区域内沿着从该区域的外周到内周的方向移动，并且第一组n个头中的每一个在其对应的记录区域内移动 在从该区域的内周到外周的方向上，使得第一组和第二组n个磁头的线速度之和基本上恒定。 此外，n个头部和第二组n个头部的第一组分别构成n对头部，每个头部由第一组的最外侧头部的第i个头部和从第一组件的最内侧头部的第i个头部 第二组（i = 1至n），使得每对头的线速度之和基本上恒定，并且等于另一对头的线速度之和。