JPS5517438A - Electronic wrist watch - Google Patents

Electronic wrist watch

Info

Publication number
JPS5517438A
JPS5517438A JP9023078A JP9023078A JPS5517438A JP S5517438 A JPS5517438 A JP S5517438A JP 9023078 A JP9023078 A JP 9023078A JP 9023078 A JP9023078 A JP 9023078A JP S5517438 A JPS5517438 A JP S5517438A
Authority
JP
Japan
Prior art keywords
motor
fet
magnetic field
mosfet
coil
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
JP9023078A
Other languages
Japanese (ja)
Inventor
Makoto Ueda
Akira Torisawa
Masaharu Shida
Shuji Otawa
Masaaki Bandai
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 JP9023078A priority Critical patent/JPS5517438A/en
Publication of JPS5517438A publication Critical patent/JPS5517438A/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

Abstract

PURPOSE:To constitute that the effect by AC magnetic field is hardly affected by controlling the drive current of motor, through the use of the motor coil as the detection element of AC magnetic field. CONSTITUTION:The drive circuit and the amplifying section are constituted with the P-MOSFET 21, 22, N-MOSFET 23 to 26, detection resistors 28, 29 and motor 20, and the amplification of the detection signal is made by alternate switching of the closed loops of the motor 20 and FET 23 and 24, and of the motor 20 and FET 26 and 23. The voltage induced in the coil 20 with external magnetic field is shortened with the closed loop of FET 23, 24, and comparatively greater current flows. Further, the closed loop is selected to that of FET 26, then a high voltage is produced across the resistor 29 instantly and the circuit is in steady-state. By detecting the high voltage, the control for the motor drive current is made.
JP9023078A 1978-07-24 1978-07-24 Electronic wrist watch Pending JPS5517438A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9023078A JPS5517438A (en) 1978-07-24 1978-07-24 Electronic wrist watch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9023078A JPS5517438A (en) 1978-07-24 1978-07-24 Electronic wrist watch

Publications (1)

Publication Number Publication Date
JPS5517438A true JPS5517438A (en) 1980-02-06

Family

ID=13992676

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9023078A Pending JPS5517438A (en) 1978-07-24 1978-07-24 Electronic wrist watch

Country Status (1)

Country Link
JP (1) JPS5517438A (en)

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