| 摘要 |
PURPOSE:To control abnormal resonance and to decrease resonance sharpness, by supporting an objective lens or its holding frame by means of an elastic support plate consisting of a plate spring. CONSTITUTION:An objective lens 7 which transmits an optical signal is fixed to the center hole of a holding member 8 which serves also as a coil winding frame. Support members 11 and 12 for control of 2-dimensional shift are connected to the tip of a coupling projection 10 formed on the member 8. These members 11 and 12 are formed by connecting frame matters similar to a parallelogrammic frame consisting of a pair of elastic faces and a pair of rigid faces. A tubular damper 20 made of a viscoelastic material like rubber, etc. is pressed into the frame matter. When a current supplied to a coil 6, the members 11 and 12 are shifted in the tracking direction T and the focusing direction F due to the elasticity of the elastic face while the rigid face kept vertical to the member 8 and a case 21. |
