| 摘要 |
PROBLEM TO BE SOLVED: To provide a dynamic pressure bearing device furnished with a thrust plate the rotating part of which is easy to float at the rotating initial stage and excellent in durability, its manufacturing method and a manufacturing method of a die for molding to be used for the manufacturing method. SOLUTION: A pair of dynamic pressure bearing surfaces 15, 16 facing against each other is formed on a shaft member 1 and a bearing member 4 free to relatively rotate, lubricating fluid is interposed between the both dynamic pressure bearing surfaces, a dynamic pressure generating groove formed into a specified shape exists at least on one side of the both dynamic pressure bearing surfaces, and a part except for the dynamic pressure generating groove part makes a land part having a protruded surface. The dynamic pressure bearing surfaces 15, 16 forming the dynamic pressure generating groove are constituted of a resin material. An inclined guide surface to introduce lubricating fluid in the dynamic pressure generating groove by wedge film work by this inclination to the land part side is provided on an edge part at least of the entering side of lubricating fluid out of the both opposed edge parts forming a groove opening part of the dynamic pressure generating groove.
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