| 摘要 |
PURPOSE:To displace a coil bobbin in axial direction only and vibrate the coil with good linearity even at a large amplitude by pulling outward a damper cylinder of quadrangular prism against a force shrinking toward the center and fixing the cylinder to an outer circumferential support ring. CONSTITUTION:The required parts of two damper plates 12, 13 are sticked and fitting parts 20a, 20b of the outer circumferential part are adhered to the upper face of the outer circumferential support ring 25 so as to form a damper 11. In an example of operation, a solid line shows a stillstand state and a broken line indicates the state upward displaced. A quadrilateral a, b, c, d are constituted by picture elements 22a, 22b, 23a, 23b and the coil bobbin fixed to the center support part is displaced upward, the point (c) is displaced to c' in the axial direction l of the coil bobbin, the quadrilateral a, b, c, d is deformed into a quadrilateral a', b', c', d'. The point (c) is displayed in the axial direction lnot displaced in the direction perpendicular to the axis l because the displacement is restricted by damper pieces 17b, 18b and 17d, 18d adjacent to damper pieces 17a, 18a, and the damper is vibrated with good linearity even at a large amplitude. |
