Horology: time measuring systems or devices – Cases – With protection means
Patent
1980-06-16
1982-02-23
Miska, Vit W.
Horology: time measuring systems or devices
Cases
With protection means
310256, G04B 3700, H02K 112
Patent
active
043171885
ABSTRACT:
A magnetic shielding plate for decreasing the affects of external magnetic flux fields on a step motor in an electronic wristwatch is provided. Specifically, the step motor includes a permanent magnet rotor and a magnetic permeable stator surrounding said rotor for incrementally rotating said rotor in response to changes in the magnetic orientation of said stator. A coil assembly includes an elongated coil core coupled to the stator and a coil wrapped around the elongated core for receiving timekeeping signals. A magnetic shield plate extends the lengthwise extent of the elongated core for shielding the coil core from external magnetic fields surrounding the wristwatch. The minimum cross-sectional area of the shield in the direction perpendicular to the elongated core, taken along the lengthwise extent of the core, defines the magnetic shielding characteristics of the shielding plate.
REFERENCES:
patent: 1871345 (1932-08-01), Rigante
patent: 2579318 (1951-12-01), Hershberger
patent: 2964901 (1960-12-01), Betner et al.
patent: 3414483 (1973-01-01), Nurnberg et al.
patent: 3919836 (1975-11-01), Nishizawa
patent: 4033111 (1977-07-01), Matsuura
patent: 4117665 (1978-10-01), Nakao et al.
Kabushiki Kaisha Suwa Seikosha
Miska Vit W.
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