JPS5518949A - Electronic wrist watch - Google Patents

Electronic wrist watch

Info

Publication number
JPS5518949A
JPS5518949A JP9179078A JP9179078A JPS5518949A JP S5518949 A JPS5518949 A JP S5518949A JP 9179078 A JP9179078 A JP 9179078A JP 9179078 A JP9179078 A JP 9179078A JP S5518949 A JPS5518949 A JP S5518949A
Authority
JP
Japan
Prior art keywords
motor
resistor
voltage
magnetic field
closed loop
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9179078A
Other languages
Japanese (ja)
Inventor
Jun Ueda
Akira Torisawa
Masaharu Shida
Masaaki Bandai
Shuji Otawa
Katsuhiko Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP9179078A priority Critical patent/JPS5518949A/en
Publication of JPS5518949A publication Critical patent/JPS5518949A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/14—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating a stepping motor
    • G04C3/143—Means to reduce power consumption by reducing pulse width or amplitude and related problems, e.g. detection of unwanted or missing step

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Stepping Motors (AREA)
  • Electromechanical Clocks (AREA)

Abstract

PURPOSE:To make it difficult to receive an external magnetic field by detecting the voltage, which is induced in the coil of a motor, thereby to control the drive current of the motor. CONSTITUTION:A drive circuit and an amplifying unit are composed of P- MOSFETs 21 and 22, N-MOSFETs 23 to 26, detecting resistors 28 and 29 and a motor 20. During the non-driven operation of the motor 20, the closed loop of the motor 20 and the FEDs 23 and 24 and the closed loop of the motor 20, the resistor 29 and the FETs 26 and 23 are alternately switched to amplify the signals resulting from an external magnetic field. At this time, the voltage induced in the coil of the motor 20 by the external magnetic field is short-circuited by the closed loop of the FETs 23 and 24 so that it is converted into a relatively high current. Then, at the resistor 29, there is generated instantly a high voltage in the resistor 29, and stability is subsequently attained under a steady condition. As a result, the motor 20 is controlled by the voltage coming from the resistor 29.
JP9179078A 1978-07-27 1978-07-27 Electronic wrist watch Pending JPS5518949A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9179078A JPS5518949A (en) 1978-07-27 1978-07-27 Electronic wrist watch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9179078A JPS5518949A (en) 1978-07-27 1978-07-27 Electronic wrist watch

Publications (1)

Publication Number Publication Date
JPS5518949A true JPS5518949A (en) 1980-02-09

Family

ID=14036391

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9179078A Pending JPS5518949A (en) 1978-07-27 1978-07-27 Electronic wrist watch

Country Status (1)

Country Link
JP (1) JPS5518949A (en)

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