| 摘要 |
PURPOSE:To minimize the overall size of a pickup, by supporting elastically the optical parts with a thin plate spring so that they can move in a 2-dimensional way toward an optical axis and the direction orthogonal to the optical axis and therefore decreasing the mobile mass as well as increasing the degree of feedom for the relation of position between an objective lens and other optical parts. CONSTITUTION:A frame 12 is elastically connected to a housing 14 by means of 4 thin plate springs 13 and can move toward an optical axis shown by an arrow 15 and in the direction orthogonal to the optical axis shown by an arror 16, respectively. The spring 13 has its side face form equal to a junction form with a part of an arc, and the combination of the side face forms is decided by the desired value of stiffness in both directions of arrows 15 and 16. The arrow 15 moves more easily than the arrow 16 to the same force, and furthermore, the natural oscillations are reduced toward the arrow 15 in terms of an oscillating element. The driving of a lens holder 11 is controlled in both directions of arrows 15 and 16 is controlled by the magnetic sucking force produced between a mobile part magnetic pole 21 adhered to the frame 12 and static part magnetic poles 22 and 23 which are set opposite to each other and have their end part split into two parts, respectively. |
