| 摘要 |
PURPOSE:To attain stable head positioning with high accuracy by increasing the surging frequency of a coil spring of a support supporting a head arm and a voice coil so as to prevent vibration from being delivered to the carriage system. CONSTITUTION:Plural holes 15 to surround a shaft 4 as a ring-form are porivided to the upper end of a thick part 14 of a support 13 supported by a shaft 4 having the head arm 6 and the voice coil 7 at the outer circumference and implanted onto the base 3 and the coil spring 16 is inserted to each hole 15. The diameter and length of the coil spring 16 are designed to small values so that the surging frequency is a frequency far higher than the resonance frequency of the mechanical system such as the carriage or the like. Thus, the vibration of the coil spring 16 does not vibrate the mechanical system such as the carriage or the like. After the coil spring 16 is inserted to each hole 15 of the support 13, the assembly is supported by an upper bearing 10 via a ring washer 17. |
