Magnetic disk coating method and apparatus

Details Magnetic disk coating method and apparatus Magnetic disk coating method and apparatus

1984-12-21

1986-05-06

Silverberg, Sam

Coating processes

Magnetic base or coating

Magnetic coating

118 52, 118107, 118240, 118401, 118409, 427240, 427377, B05D 512

Patent

active

045871396

ABSTRACT:
A rigid magnetic disk substrate is spin coated using a closely confining, stationary air barrier adjacent the surface being coated. The coating is applied through a slotted opening in the air barrier which is progressively closed as the coating is applied and completely sealed during the spin-off operation. During the application of the coating, the air barrier is positioned approximately 0.15 inch from the disk substrate surface and prior to spin-off, the barrier is moved to a position 0.025 inch from the coated surface. Further, during the high speed spin-off cycle a high kinematic viscosity gas, such as helium, is introduced into the space between the barrier and the coated surface to establish a laminar flow condition and eliminate spoking of the coated material.

REFERENCES:
patent: 4133911 (1979-01-01), Koester et al.
patent: 4201149 (1980-05-01), Koester et al.
patent: 4393807 (1983-07-01), Fujimura et al.
patent: 4416213 (1983-11-01), Sakiya
patent: 4485758 (1984-12-01), Peugh et al.

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