Patent ID: 6860636

Claim:
A dynamic pressure bearing in which a shaft is fitted into a sleeve via a minute gap, dynamic pressure grooves are formed in at least one of an inner peripheral face of said sleeve and an outer peripheral face of said shaft, and a lubricant fluid is filled into said minute gap, wherein first and second tapered portions are disposed in an end part of said sleeve, said first tapered portion in which a diameter is gradually increase toward an outer side in a radial direction as moving from an end face of said sleeve toward an inner side, and said second tapered portion which is continuous to said first tapered portion, and in which a diameter is gradually decrease toward an outer side in a radial direction as moving toward the inner side, an inclination angle β of said second tapered portion with respect to said shaft is 4° to 10°, and an inclination angle α of said first tapered portion with respect to said shaft is smaller than the inclination angle β of said second tapered portion with respect to said shaft.