| 摘要 |
The present invention relates to a housing (7) for a fluid dynamic bearing device, the housing (7) being a product which is formed by injection molding a resin, the housing (7) integrally having a cylindrical side section (7a) and a bottom section (7b) which closes one axial end of the side section (7a). The housing (7) has a gate mark (7b30) comprising a surface formed by a closure member (27) for closing an injection gate (26). The present invention also relates to a fluid dynamic pressure bearing device having the housing (7) and to a motor having the fluid dynamic pressure bearing device. The present invention further relates to a method for manufacturing the housing (7), the method having: a step in which a molten resin within a runner is injected into a cavity (23) through the injection gate (26); a step in which the injection gate (26) is closed by the closure member (27) to separate the molten resin within the runner (25) and the molten resin having been introduced into the cavity (23); and a step in which the molten resin having been introduced into the cavity (23) is cooled and solidified. |
