METHOD FOR DRIVING OBJECT-LENS AND DISK DEVICE USING IT

摘要

PROBLEM TO BE SOLVED: To offset a moment generated in a focusing coil against a moment generated in a tracking coil to reduce a lens inclination by arranging a fixed part substrate so that an intersectional position of diagonal lines between fixing points of elastic support members stays nearer the side of a disk-like recording medium than a position of a center of gravity of a magnet in the focusing direction. SOLUTION: If a gravitational settlement of a lens holder in the case of performing record or reproduction to a disk in a horizantal state is expressed asδ, a distance between an intersection Ckiban of diagonal lines of elastic support member attachment holes 17 of a fixed part substrate 10 and the center of gravity Cmag of a magnet 8 is aboutδ/2 in the focusing direction 15, and the intersection Ckiban of the diagonal lines of the attachment holes 17 is to be arranged on a fixed part substrate 10 so as to be on the disk side to the center-of-gravity Cmag of the magnet 8. Thus, a lens inclination can be kept small in any case when an objective lens driving device is placed horizontally or vertically.