Recording disk with low total indicated runout

Details Recording disk with low total indicated runout Recording disk with low total indicated runout

1986-01-27

1989-01-10

Hecker, Stuart N.

Dynamic magnetic information storage or retrieval

Record medium

Disk

360131, G11B 582

Patent

active

047977647

ABSTRACT:
A magnetic recording medium disk with substantially improved tolerances comprising:
a hub including a center portion and recessed flange portion, the center portion having a planar drive surface; magnetic medium, including a side zero and a side one; and an adhesive bonding the side one of the medium to the flange of the hub, wherein the side zero of the medium is fixed a precise, desired distance .alpha. from the plane of the drive surface and the total indicated runout of the hub used divided by the total indicated runout of the distance .alpha. is greater than one. A method and apparatus for manufacturing a magnetic recording medium disk with substantially improved tolerances by applying ultrasonic vibrations to the medium and a hot melt adhesive until the precise desired distance .alpha. is achieved.

REFERENCES:
patent: 3689334 (1972-09-01), Dermody
patent: 3727619 (1973-04-01), Kuris
patent: 4445157 (1984-04-01), Takahashi
patent: 4470083 (1984-09-01), Doering et al.
patent: 4544977 (1985-10-01), Ozawa et al.
patent: 4609964 (1986-09-01), Sobel
patent: 4698715 (1987-10-01), Oishi

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