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    • 6. 发明授权
    • Method and apparatus for optically recording and reproducing information
    • 用于光学记录和再现信息的方法和装置
    • US4545044A
    • 1985-10-01
    • US408698
    • 1982-08-16
    • Isao SatohTomio YoshidaShunji OharaKenji Koishi
    • Isao SatohTomio YoshidaShunji OharaKenji Koishi
    • G11B20/10G11B7/00G11B7/004G11B7/0045G11B7/0055G11B7/007G11B17/00G11B27/034G11B27/036G11B27/11G11B27/19G11B27/24G11B27/32
    • G11B17/005G11B27/034G11B27/036G11B27/11G11B27/19G11B27/24G11B27/329G11B7/0045G11B7/007G11B2220/20G11B2220/216G11B2220/218G11B2220/65
    • In an optical disc having a file region and a directory region for carrying various pieces of information or data, one or more designated information can be erased by irradiating a laser light beam on a corresponding region in the file region where the light beam is modulated by a superposing writing signal which may be a d.c. or a predetermined a.c. signal. When it is intended to renew the information, designated information is first read out and stored in an external memory prior to performing superposing writing. Meanwhile, the data is renewed and is then written on an unused region in the file region. The directory of the renewed data region is also written so that the renewed information will be read out by searching the new directory. In another embodiment of the invention, the information in the file region is not erased to renew the same, but its directory is erased by superposing writing. A new directory for a renewed information, which is written in unused region in the same manner as the above, is written so that the renewed information can be read out by using the new directory. When reproducing, an envelope of the reproduced signal is detected to see whether information can be read out or not. Thus, erased information is skipped to reproduce only unerased information.
    • 在具有用于承载各种信息或数据的文件区域和目录区域的光盘中,可以通过将激光束照射在光束被调制的文件区域中的相应区域上来消除一个或多个指定信息 一个叠加的写信号可能是直流电 或预定的a.c. 信号。 当意图更新信息时,首先将指定的信息读出并存储在外部存储器中,然后再进行叠加写入。 同时,更新数据,然后写入文件区域中的未使用区域。 更新的数据区域的目录也被写入,以便通过搜索新的目录来读出更新的信息。 在本发明的另一个实施例中,文件区域中的信息不被擦除以更新它,但是通过叠加写入来擦除其目录。 以与上述相同的方式写入未使用区域的新信息的新目录被写入,以便可以通过使用新目录读出更新的信息。 当再现时,检测再现信号的包络线以查看是否可读出信息。 因此,擦除的信息被跳过以仅再现未被更新的信息。