Patent ID: 7507039

Claim:
A method of manufacturing one or more grooves in a bearing, the method comprising: forming a resist on the inner surface of the bearing; inserting a mask on which at least one dynamic pressure generating groove pattern is formed; applying exposure and transferring the dynamic pressure generating groove pattern of the mask to the resist; developing the resist; etching a transferred dynamic pressure groove pattern on the bearing; and removing the resist; wherein the mask is made of transparent material; a first dynamic pressure generating groove pattern is formed on a cylindrical or conical outer peripheral surface of the mask, and a second dynamic pressure generating groove pattern is formed on a flange part of the mask; and the mask is inserted in the bearing, a light-guiding material is inserted in the cylindrical or conical mask, and exposure is applied by guiding light from an external light source to the inside of the bearing through the light-guiding material.