| 摘要 |
PURPOSE:To suppress the effect of gravity by tilting two orthogonal drive axes to a perpendicular line when an optical axis correction lens is driven in two orthogonal directions within a plane at a right angles to its optical axis with an equivalent component of the gravity in the two orthogonal directions. CONSTITUTION:A weight of an X axis drive system comprising an X axis direct drive guide 51 and an X axis voice coil motor 53 and a weight of a Y axis drive system comprising a Y axis direct drive guide 52 and a Y axis voice coil motor 54 are independently received by a voice coil base 40. Then only a lens unit such as a voice coil bobbin 78 whose weight is light, X, Y axis direct drive guides 51, 52, and a lens holder 47 are adopted for moving parts. Thus, a drive load for the X, Y axis drive systems is uniformized, a high speed response operation of an optical axis correction lens 8 is attained and a servo gain is easily optimized. Then the X, Y axes are tilted respectively by 45 deg. with respect to a perpendicular line P1 to share the effect of gravity onto the X, Y axis drive systems equivalently so as to suppress the effect of gravity onto the drive systems thereby eliminating the need for adjustment of servo gain. |
