Patent ID: 7650697

Claim:
A method in the manufacturing of a fluid-dynamic-pressure bearing which includes a stationary unit and a rotary unit having respective surfaces, the method comprising: treating at least one of the respective surfaces of the stationary unit and the rotary unit with plasma or ultraviolet radiation; assembling the stationary unit and the rotary unit such that that the respective surfaces of the stationary and rotary units confront and are spaced from one another and such that the rotary unit is rotatable relative to the stationary unit, wherein an interspace constituting a micro-gap is delimited by and between the respective surfaces; and subsequently infusing into the micro-gap lubricating fluid in an amount by which a boundary between the lubricating fluid and the ambient atmosphere is formed in the interspace, and wherein the shape of the boundary is formed by capillary action between the lubricating fluid and the respective confronting surfaces of the stationary and rotary units such that a surface of the lubricating fluid at the boundary provides a capillary seal that retains the lubricating fluid in the micro-gap; wherein the treating at least one of the respective surfaces of the stationary unit and the rotary unit with plasma or ultraviolet radiation includes treating a location thereon where the surface of the lubricating fluid constituting the capillary seal will touch, and wherein the method further comprises fabricating a component of one of the units of resin, and wherein the resin component has one of the respective surfaces, and the treating of the respective surface of the resin component comprises treating the surface with ultraviolet radiation.