Patent ID: 8531789
Filing Date: 2013-09-10
Classification: F16F

Abstract:
1. A leaf spring supporting a pillar shaped movable portion disposed in a center portion with respect to a cylindrical fixed portion disposed around said movable portion in a direction of a center axis shiftably so as to position said movable portion in a radial direction, said leaf spring comprising: an inner edge portion having an annular shape; an outer edge portion apart from said inner edge portion, said outer edge portion having a larger radius than said inner edge portion; N arm portions disposed along a circumferential direction in order to connect said inner edge portion and said outer edge portion, where N represents an integer which is not less than two; N inner coupling portions coupling said inner edge portion and said N arm portions; and N outer coupling portions coupling said outer edge portion and said N arm portions; wherein said leaf spring is made of stainless steel having a relative magnetic permeability which is not less than 1.1.