Information recording disk, its production method and recording

Details Information recording disk, its production method and recording Information recording disk, its production method and recording

1990-01-25

1996-08-20

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

369 58, 360 7702, 360135, 360 9801, 360 9912, G11B 1518, G11B 5596

Patent

active

055484549

ABSTRACT:
In the information recording disk, the positioning signal of the information convertor is provided permanently, as a change in shape or material, to the front and reverse surfaces of the disk substrate and their eccentric distances from the center position is made to be smaller than half the repeating unit length of the positioning signal of the information convertor in the radial direction. The start position of the positioning signal in the circumferential direction is preferably made to be coincident on the front and reverse surfaces of the disk substrate within 10 .mu.m. The position reference for aligning the position in the radial direction or the position reference for aligning the rotation angle position in the circumferential direction is preferably disposed on the inner diameter portion or outer diameter portion of the disk substrate, respectively, and these position references can be accomplished by disposing at least one notch on the inner or outer peripheral edge portion of the disk substrate.

REFERENCES:
patent: 4670803 (1987-06-01), DeMoss et al.
patent: 4697216 (1987-09-01), Tsukahara
patent: 4730300 (1988-03-01), Ramoshita et al.
patent: 4807063 (1989-02-01), Moteki
patent: 4910616 (1990-03-01), Sirai et al.
patent: 5023857 (1991-06-01), Verboom
patent: 5050013 (1991-09-01), Holsinger
patent: 5072438 (1991-12-01), Suzuki et al.
patent: 5111446 (1992-05-01), Fujita

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