| 摘要 |
PURPOSE:To improve accuracy, detachability, and a cooling ability by simple construction by integrally forming an external cylinder and an internal cylinder to be used as a bearing by radially connecting ribs and inserting radiating fins with a predetermined density between the ribs. CONSTITUTION:An external cylinder 6 and an internal cylinder 5 of a bearing are integrally connected by a number of radial connecting ribs 3. Between these ribs 3, radiating fins 4a, 4b and the like having different length are disposed and the nearer there goes to a cool air flowing out side, the larger a density of a cooling fin becomes. By a simple construction, a rotating body suitable for a sensitive drum and the like has excellent characteristics such as an easiness in detaching, an alignment with a high accuracy with a drum axis, and a cooling feature with high efficiency. |
