Optical recording disc

Details Optical recording disc Optical recording disc

G - Physics

11

B

352/32.4

G11B 7/24 (2006.01) B29C 65/00 (2006.01) B29C 65/08 (2006.01) G11B 7/26 (2006.01) G11B 11/10 (2006.01) G11B 11/105 (2006.01) G11B 23/00 (2006.01)

Patent

CA 1276722

ABSTRACT OF THE DISCLOSURE An optical recording disc in which a disc substrate made of a synthetic resin having a light transmittance and a hub made of a synthetic resin, fixed to a center part of the disc substrate by means of a predetermined technique such as a supersonic wave expansion molding and on which a circular magnetic metal plate is installed by means of an insert molding and so on are provided and a circular groove which is continuous at an outer peripheral side of a fixing part between the disc substrate and hub is furthermore installed on at least either of the disc substrate or hub. The groove is provided for absorbing a stress generated due to a difference in thermal expansion rates between the disc substrate made of the synthetic resin and magnetic metal plate.

529674

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