Title:
DISK FOR INFORMATION SIGNAL RECORDING
Document Type and Number:
Japanese Patent JPH064909
Kind Code:
A
Abstract:
PURPOSE: To assure the strength of a disk substrate having a recessed part to be disposed with a plate for magnetic attraction and to exactly dispose the plate in a stable state into the recessed part.
CONSTITUTION: This disk has a center hole 23 in the central part and has the disk substrate 22 consisting of a synthetic resin formed with the recessed part 26 disposed with the plate 25 for magnetic attraction on one main surface side enclosing this center hole 23. A curved part 36 having the depth recessing from an placing surface 27 is formed 10 the part of the recessed part 26 of the disk substrate 22 where the placing surface 27 on the base side and the rising surface 35 of the recessed part 26 are continuous.
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Inventors:
TAKAHASHI KENJI
Application Number:
JP18891392A
Publication Date:
January 14, 1994
Filing Date:
June 24, 1992
Export Citation:
Assignee:
SONY CORP
International Classes:
G11B7/24097; G11B23/00; (IPC1-7): G11B7/24; G11B23/00
Attorney, Agent or Firm:
Akira Koike (2 outside)
Next Patent: PRODUCTION OF OPTICAL DISK