发明名称 |
Electronic analogue timepiece of DC magnetic field detection type |
摘要 |
In an electronic analogue timepiece driven by a stepping motor, DC magnetic field detector is connected to the stepping motor to detect the presence of an external DC magnetic field by comparing two induced voltages induced across a motor coil due to free rotation of a motor rotor after each application of two successive drive pulses to the motor coil. A controller is connected to the DC magnetic field detector to control the stepping motor to effect compensation for the detected DC magnetic field.
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申请公布号 |
US4688948(A) |
申请公布日期 |
1987.08.25 |
申请号 |
US19860903692 |
申请日期 |
1986.09.04 |
申请人 |
SEIKO INSTRUMENTS & ELECTRONICS LTD. |
发明人 |
KIYONO, YOSHIHIKO |
分类号 |
G04C3/00;G04C3/14;(IPC1-7):G04F5/00;G05B19/40 |
主分类号 |
G04C3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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