Patent ID: 8313803
Filing Date: 2012-11-20
Classification: G11B

Abstract:
1. A spin coating method for coating a recording medium substrate having a hole in a center thereof, comprising: providing a feeding nozzle for feeding a coating liquid onto a recording surface of the recording medium; moving a tip of the feeding nozzle to an initial position, the initial position being at a distance X above the recording surface of the recording medium substrate, and at a distance A radially apart from a periphery of the hole of the recording medium substrate; and feeding the coating liquid onto the recording surface for a predetermined period of time while rotating the recording medium substrate at a predetermined rotating speed, and moving the tip of the feeding nozzle from the initial position along a radial direction towards an outer periphery of the recording medium substrate while keeping the tip of the feeding nozzle above the recording surface at the distance X; wherein X satisfies X≦2[3 r y/(2g C)] A satisfies A≧r+X/3.