| 摘要 |
<P>PROBLEM TO BE SOLVED: To decrease the movement of a mass center during shrinkage and expansion of a hair spring. <P>SOLUTION: In association with the field of a spring balance resonator, a hair spring 1 includes: a first hair spring 3 of which the curved line is extended on a first plane; a second hair spring 5 of which the curved line is extended on a second plane in parallel with the first plane; and a mounting member 4 for fixing one end of the curved line of the first hair spring 3 to one end of the curved line of the second hair spring 5 so as to form serial double hair springs 1. The curved line of the first hair spring 3 and the curved line of the second hair spring 5 include continuous variable pitches, respectively, pass through a central plane of a projection of the mounting member 4 and is symmetric to a straight line in parallel with the first and second planes and in order to decrease the movement of a mass center during shrinkage and expansion, each of the curved lines obeys the relationship. <P>COPYRIGHT: (C)2012,JPO&INPIT |
