PRINTED COIL SUBSTRATE FOR OPTICAL DISC ACTUATOR, OPTICAL DISC PICKUP, AND OPTICAL DISC DRIVE DEVICE

摘要

The present invention provides a printed coil substrate for an optical disc actuator so that the sensitivity will change as little as possible when shifting in a focal direction and a tracking direction. Although the coil patterns laminated at a corresponding position have approximately same shape, center locations in shape of the tracking coil and the focus coils are displaced between the neighboring substrate layers, and the center locations in shape are displaced by a predetermined distance toward a direction of driving the movable portion driven by the coils. Even when the coil pattern of the first layer is moved in a direction of leaving from the position where magnetic force of the magnet is strong, the coil pattern of the second layer is simultaneously moved into the position where magnetic force of the magnet is strong. Therefore, the change of the sensitivity can be relatively compensated.

主权项

1. A printed coil substrate for an optical disc actuator so as to drive a movable portion of the optical disc actuator relatively to a fixed portion, wherein
the printed coil substrate is formed by a plurality of laminated substrate layers,
coil patterns are formed on predetermined portions of each of the substrate layers,the coil patterns of the substrate layers having an approximately same shape are connected with each other between the coil patterns laminated at a corresponding position so that coils are formed at each of the predetermined portions,center locations in shape of the coil patterns, which are formed on the substrate layers to form the coils, are displaced between neighboring substrate layers, andthe center locations are displaced by a predetermined distance toward a direction of driving the movable portion driven by each of the coils.