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Optical information recording disc and apparatus for driving the disc
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Inventors: Suzuki, Masahiro; Sonobe, Takeo; Kurane, Koreaki; Saito, Akira;
Assignee: Hitachi Maxell, Ltd. (Osaka, JP); Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Ip; Paul
Assistant Examiner:
Attorney, Agent or Firm: Birch, Stewart, Kolasch & Birch
An optical information recording disc having at least one substrate for recording/reproducing information through an optical unit wherein a spindle hole, through which a spindle is provided as a disc drive system, is formed in a central portion of the substrate and an engagement member engageable with a disc engagement member integrally formed with the spindle, is formed around the central portion. |
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DETAILED DESCRIPTION In order to overcome the above-noted defects, an object of the present invention is to provide a compact disc, a drive apparatus for rotatably driving an optical information recording disc at a high speed, and an optical information recording disc applicable to the drive apparatus.
In order to attain the object, the present invention is characterized in that a substrate or base where information is recorded/reproduced by optical means has a spindle hole, into which in the disc drive apparatus is inserted and a disk engagement means formed integral with a spindle means at an outer peripheral portion thereof which engages an engagement means formed integral with the disc.
In addition, according to the invention, a disc engagement means, engageable with an engagement means provided in the central portion of the optical disc, is formed on in the spindle for rotatably driving the optical information recording disc.
As described above, when the optical information recording disc and the spindle are engaged with each other through mechanical engagement means, there is no slippage therebetween even during the application of a large torque.
It is, therefore, possible to start the rotation of the optical information recording disc at a high speed or rapidly and to rotatably drive the disc at a high speed.
Thus, it is possible to increase the data transfer speed and to reduce errors in recording/ reproducing the information.
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