Panasonic Corporation

Yoshihito Watanabe

Takao Yoshitsugu

Keigo Kusaka

Hiroyuki Kiriyama

Koji Hirata

Hisaaki Yano

With a hydrodynamic bearing device, a first gap Gis formed between a shaftand a sleeve. A second gap Gis formed between a sleeve capand the sleeve, and holds a lubricant. A thrust bearing memberis disposed near the inner peripheral surface of a center holeof the sleeve cap. A third gap Gis formed between the thrust bearing memberand the sleeve cap, and is open to the atmosphere. A fourth gap Gis formed between the thrust bearing memberand the sleeve. The lubricantcirculates along a circulation passage that includes a communicating path, the first gap Gand the second gap G

Hydrodynamic bearing device, and spindle motor and information apparatus equipped with same

The cross sectional shape of an axial direction communicating path when viewed in the axial direction is flat in the circumferential direction, and the cross sectional area of the communicating path gradually decreases moving from the center of the cross section toward the both ends in the circumferential direction. When a sleeve and a cover member are bonded with an adhesive, the adhesive is actively made to flow into an adhesive inflow portion.

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Ehime, Japan

Yoshihito Watanabe