JPS5517472A - Electronic wrist watch - Google Patents

Electronic wrist watch

Info

Publication number
JPS5517472A
JPS5517472A JP9083078A JP9083078A JPS5517472A JP S5517472 A JPS5517472 A JP S5517472A JP 9083078 A JP9083078 A JP 9083078A JP 9083078 A JP9083078 A JP 9083078A JP S5517472 A JPS5517472 A JP S5517472A
Authority
JP
Japan
Prior art keywords
motor
gates
voltage
magnetic field
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
JP9083078A
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 JP9083078A priority Critical patent/JPS5517472A/en
Publication of JPS5517472A publication Critical patent/JPS5517472A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)

Abstract

PURPOSE:To reduce the effect by AC magnetic field, by constituting the entire circuit with one chip C-MOS IC. CONSTITUTION:The drive circuit and amplifying section is formed with P type MOSFET gates 21 and 22, N type MOSFET gates 23 to 26, detection resistors 28 and 29 and motor 20. The voltage induced in the coil by external magnetic field is shortened with the closed loop of the N gates 23 and 24. The N gates 23 and 24 are transistors for motor drive and ON resistance is about 10 ohms. Thus, the voltage induced in the coil is shortened and comparatively greater current flows. Next, switching is made to the closed loop of the motor 20, N gates 26 and 23, detection resistor 29. Since the coil of the motor 20 has an inductive component, comparatively greater current keeps flowing, a greater voltage is produced across the detection resistor 29 for a moment, and the voltage is in steady state which is determined with the detection resistor 29, induced voltage by external magnetic field, and coil resistance. Accordingly, without using special detection element, AC magnetic field can be detected with low power consumption and the drive current of motor can be controlled to achieve initial objective.
JP9083078A 1978-07-25 1978-07-25 Electronic wrist watch Pending JPS5517472A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9083078A JPS5517472A (en) 1978-07-25 1978-07-25 Electronic wrist watch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9083078A JPS5517472A (en) 1978-07-25 1978-07-25 Electronic wrist watch

Publications (1)

Publication Number Publication Date
JPS5517472A true JPS5517472A (en) 1980-02-06

Family

ID=14009497

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9083078A Pending JPS5517472A (en) 1978-07-25 1978-07-25 Electronic wrist watch

Country Status (1)

Country Link
JP (1) JPS5517472A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02195933A (en) * 1989-01-25 1990-08-02 Topcon Corp Ophthalmologic instrument

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02195933A (en) * 1989-01-25 1990-08-02 Topcon Corp Ophthalmologic instrument

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