| 摘要 |
An arm member (52) detachably provided with a stylus arm (53) is rotatably held by a casing (11), where pivots (68) respectively project from both sides of a rotation center of the arm member (52), a first ball bearing (70) engaging with one of the pivots (68) is fixed to the casing (11) and a second ball bearing (70) engaging with the other one of the pivots (68) is fixed to the second ball bearing (70). A leaf-spring (75) has one end fixed to the casing (11) and the other end fixed to the second ball bearing (70). Since the second ball bearing (70) does not shift relative to the leaf-spring (75), measuring pressure remains stable.
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