| 摘要 |
PURPOSE:To improve resonance characteristics and mechanical strength by concentrically disposing plural reinforcing members in a manner that the radial interval of the concentrical members increases with the radius. CONSTITUTION:Four ring-type reinforcing members 7 each having different diameter to others are concentrically disposed with an adhesive 6 between an inner spacer 2 and an outer spacer 3 between two transparent substrates 1. These reinforcing members 7 are disposed in a manner that the radial interval increases with the radius. In this constitution, each reinforcing member acts as a beam, which raises the total mechanical strength and prevents distortion or deformation of the transparent substrates 1. Moreover, weight distribution of the disk decreases with the radius, which improves the resonance characteristics. |
