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    • 57. 发明专利
    • WRIST WATCH WITH ROTARY WEIGHT
    • JPH05323051A
    • 1993-12-07
    • JP12606792
    • 1992-05-19
    • SEIKO EPSON CORP
    • NAGAO SHOICHI
    • G04B5/10G04B27/02G04C3/14G04C10/00
    • PURPOSE:To realize a smaller size and a less thickness of a rotary weight by a method wherein a thick part is formed on the outer circumference side of a rotary weight while a thin part on the side of the center of rotation thereof and a wheel train part is arranged in a range of a rotating locus of the thin part while a part of a coil is arranged in a range of a rotating locus of the thick part. CONSTITUTION:A rotary weight 20 has a thick part 20a on an outer circumference part 20a and takes a locus rotating outside the most of built-in parts constituting a movement. A dynamo coil 29 has a part thereof overlapping a coil winding part flatly with respect to a thick part 20a. The winding part of the dynamo coil 29 overlaps a gear 25b of a dynamo rotor transmission wheel 25 and further, a MOSIC chip 32 constituting a circuit and a circuit substrate 37. This enables the ensuring of a half weight value of the rotary weight even if the diameter of the movement is small.