Nidec Copal Electronics Corporation

Copal Electronics Co., Ltd.

Takeshi Hijiya

Akiyoshi Takahashi

Toshiya Uchida

Kachu Ishizuka

Hiroki Matsushita

Nakazo Ariyama

Takahiro Kikuchi

Provided are a fluid dynamic bearing, a motor, and an optical deflector, for which a fixed shaft can be attached with little axial eccentricity. The bearing () is equipped with a fixed shaft (), a sleeve () provided so as to be capable of rotating around the fixed shaft (), dynamic pressure generating sections () provided in the sleeve (), and a lower case () for securing the lower end () of the fixed shaft (). In addition, the bearing is equipped with a retaining case (), which has a chuck () that retains the upper end () of the fixed shaft () secured by the lower case (), and which can be secured to the lower case () in a state that does not generate pressure causing the axial center of the fixed shaft () to move.

Fluid dynamic bearing, motor, and optical deflector

A circumferential flow type dynamic pressure bearing 1 is comprised of a shaft 2 having a multiple-arc-shaped pressure generating surface and a circular sleeve 3 fitted on the shaft 2. The shaft or the sleeve is formed with a plurality of proximity portions 4 each of which is close in distance to the surface opposed thereto whereby the support force of gas is generated. A plurality of grooves 5 formed at locations spaced from each other by an angle obtained by dividing the circumference by the number of proximity portions 4 or a divisor thereof. Use of such bearing ensures compatibility with high-humidity environmental conditions by provision of grooves, and at the same time it is capable of eliminating or reducing noise generated by vibration caused by radial deviations of the shaft due to provision of the grooves.

Circumferential flow type dynamic pressure bearing

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Iruma, Japan

Takeshi Hijiya