| 摘要 |
PROBLEM TO BE SOLVED: To prevent molding burrs and work burrs from affecting a focusing servo and a tracking servo even when minute molding burrs are generated by an injection molding and work burrs are generated at the time of a chamfering work by providing a large diameter part having a diameter larger than the diameter of a bearing hole at the circumference of the end face of one side of the bearing hole engaging freely rotatably with respect to a supporting shaft and freely movably in the axial direction of the shaft. SOLUTION: A lens holder 10 has a bearing hole 11 at its center part and a lens fitting hole 12 at the eccentric position of the hole 11 and a large diameter part 11a at the hole 11. The size of the large diameter part 11a is made such the diameter of the size that even when a molding burrs at the time of a molding are generated or work burrs at the time of chamfering the bearing hole 11 are generated, the molding burrs and the work burrs are not produced to the inside of bearing hole 11. Concretely, it is preferable for the size of the large diameter part 11a when the the diameter of the bearing hole 11 is 1 to 2 mm that the increment A of one side is 3 to 10 μm and a length B is 0.3 to 1 mm. When the size of the part 11a is within this range, the molding burrs and the work burrs are never protruded to the inside of the hole 11. |
