| 摘要 |
Provided are: a synthetic-resin bearing base (2) provided with a base (4), an ring-shaped protruding part (6) integrally projecting from one surface (5) of the base (4), and an air-supply channel (11) that opens at one end (7) on the protruding end surface (8) of the ring-shaped protruding part (6) and at the other end (9) at the outer circumferential surface (10) of the base (4) and is provided in the ring-shaped protruding part (6) and the base (4); and a synthetic-resin bearing (3) having an ring-shaped depression (42) formed in one surface (41) facing one surface (5) of the base (4), the depression accommodating the ring-shaped protruding part (6) of the bearing base (2), and a plurality of air-outflow holes (47) acting as an annular restrictor, communicating at one end (45) with a ring-shaped concave groove (44) opening at the other surface (43), and opening to the ring-shaped depression (42) at the other end (46). |
