| 摘要 |
PROBLEM TO BE SOLVED: To inexpensively provide a hydrodynamic bearing device provided with high durability and reliability. SOLUTION: A step 17 is formed on an inner circumferential face of a bearing member 8. A dynamic pressure groove pattern is printed on an outer circumferential face 2a1 of a shaft member 2 facing a large diameter inner circumferential face 8a1 by an ink jet method to form a first bearing part 14 comprised of a hydrodynamic bearing. A radial bearing clearance is formed between a small diameter inner circumferential face 8a2 and the outer circumferential face 2a1 of the shaft member 2 facing it to form a second bearing member 15 comprised of a perfect circle bearing. The shaft member 2, and a portion forming the small diameter inner circumferential face 8a2 of the bearing member 8 are both formed by a metal material. COPYRIGHT: (C)2006,JPO&NCIPI
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