Patent ID: 7265467

Claim:
A bearing device comprising: a shaft body; a stationary part; a bearing cavity which is formed in the stationary part, and is opened on one end side thereof to rotatably insert the shaft body therein; a first tapered seal part which is formed in the stationary part, and is opened at an end surface on the one end side of the stationary part to communicate to ambient air; a radial gap which is formed between an inner peripheral surface of the bearing cavity and a surface of the shaft body opposed to the inner peripheral surface of the bearing cavity; a radial dynamic pressure bearing mechanism comprising the outer peripheral surface of the shaft body as a bearing surface, and the inner peripheral surface of the bearing cavity as a bearing surface; a connecting path which is formed in the stationary part and connects the first tapered seal part and the radial gap; a communicating path being connected to the radial gap at two points to communicate the radial gap therethrough, the two points positioned axially apart to each other, at least a part of the radial dynamic pressure bearing mechanism located between the two points; a lubricating liquid which fills the radial gap, the connecting path, and the communicating path, substantially without interruption and fills up to the middle of the first tapered seal part; a first interface which is formed between the lubricating liquid and the ambient air in the first tapered seal part; a second interface which is formed between the lubricating liquid filling the radial gap and ambient air in an end surface on one end side of the radial gap, and is narrower in width than the first interface; and an oil repellent region formed on a surface of the stationary part adjacent to the ambient air side of the second interface, and on a peripheral surface of the shaft body adjacent to the ambient air side of the second interface.