US 5,478,595 A · Method and apparatus for forming film on surface of disk

Abstract

A disk body (1) is arranged so that a portion of the coating forming surface thereof exists over a spray region A of a substantially circular cross-section made by a nozzle (10) for production of super fine particles to spray a coating forming agent, and the coating forming agent is sprayed while the disk body (1) is being rotated about the center thereof. The section near the peripheral edge of the disk body (1) passes through the section near the center of the spraying region where the density of fine particles is higher; however the passing speed thereof is fast, so the deposit efficiency of fine particles per unit area of the disk body (1) is lower, while the section near the center of the disk body (1) passes through the section near the peripheral edge of the spray region where the density of fine particles is lower; however, the passing speed thereof is slow, so the deposit efficiency of fine particles per unit area of the disk body is higher. This makes the amount of the fine particles which sticks to and accumulates on the disk body (1) uniform in the radial direction of the disk.

Claims9

Dependent claims

A method for forming a uniform coating of a sprayable coating agent on a flat surface of a peripheral portion of a disc body along the radius thereof by means of a spray nozzle means for spraying particles of said coating agent in a generally circular pattern, wherein the radius of the spray pattern is equal to or greater than the radial extent of the peripheral portion of the disc body to be coated, and the density of the particles along the radius of the pattern is greater toward the center of the pattern and lesser toward the edge of the pattern, comprising the steps of:

positioning said nozzle means so that one side of the circular spray pattern completely overlaps the radial extent of said peripheral portion of the disc, with the center of said circular spray pattern being directed toward the periphery of the disc body and the edge of said pattern being directed toward the center of the disc body while the other side of the circular spray pattern does not overlap said disc body, and
actuating said spray means while rotating said disc body at a speed sufficient to create a difference in the deposit efficiency of the spray particles along the radius of the disc body that complements the radial difference in the density of the spray particles in the circular spray pattern such that said spray particles are uniformly deposited along the radius of the disc body.

An apparatus for forming a uniform coating of a sprayable coating agent on a flat surface of a peripheral portion of a disc body along the radius thereof, comprising:

a spray nozzle means for spraying particles of said coating agent in a generally circular pattern wherein the radius of the spray pattern is equal to or greater than the extent of the peripheral portion of the disc body to be coated, and the density of the particles along the radius of the pattern is greater toward the center of the pattern and lesser toward the edge of the pattern;
means for positioning said nozzle means so that one side of the circular spray pattern completely overlaps the radial extent of said peripheral portion of the disc with the center of the circular spray pattern contacting the periphery of the disc body and the edge of the pattern contacting the center of the disc body while the other side of the spray pattern does not overlap said disc body, and
means for rotating said disc body at a speed sufficient to create a difference in the deposit efficiency of the spray particles that complements the radial difference in the density of the spray pattern such that said spray particles are uniformly deposited along the radius of the disc body.

Dependencies are inferred from the claim text.

Method and apparatus for forming film on surface of disk

Life of this patent

Method and apparatus for forming film on surface of disk

Life of this patent

Abstract

Claims9