| 摘要 |
PURPOSE:To obtain a desired movable range and to reduce size by forming commonly magnetic circuits and coils for both control of focus and tracking. CONSTITUTION:Three movable coils 13-15 of which the respective axial directions are the direction A-A having an angle theta to a Z-Z axis in an X-X plane, the direction B-B symmetrically with the direction A-A with respect to the Z-Z axis and the X-Z axis direction are wound respectively around the outside circumference of a lens barrel 6' and are connected to each other. Magnetic circuits 16, 16' consisting of magnetics 16a, 16a' and yokes 16b, 16b' of which the respective magnetic pole directions are in the Y-Y axis direction are so disposed that the N pole and N pole of the magnets 16a, 16a' face each other with the barrel 6' in-between and that the magnetic pole directions thereof coincide with the direction Y-Y. If the magntiudes and directions of the currents I1-I3 to be conducted to these coils 13-15 are selected, thin plate parts 12a, 12a' displace in the direction Z-Z and focus control is accomplished. Tracking control is accomplished when thin plate parts 12b, 12b' displace in the direction X-X. |
