CH634964B - Dispositif detecteur de champ magnetique pour piece d'horlogerie. - Google Patents

Dispositif detecteur de champ magnetique pour piece d'horlogerie.

Info

Publication number
CH634964B
CH634964B CH492479A CH492479A CH634964B CH 634964 B CH634964 B CH 634964B CH 492479 A CH492479 A CH 492479A CH 492479 A CH492479 A CH 492479A CH 634964 B CH634964 B CH 634964B
Authority
CH
Switzerland
Prior art keywords
magnetic field
driving coil
closed loop
resistance element
impedance closed
Prior art date
Application number
CH492479A
Other languages
English (en)
Other versions
CH634964GA3 (fr
Inventor
Makoto Ueda
Akira Torisawa
Shuji Otawa
Masaaki Mandai
Masaharu Shida
Katsuhiko Sato
Original Assignee
Seiko Instr & Electronics
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 of CH634964B publication Critical patent/CH634964B/fr
Application filed by Seiko Instr & Electronics filed Critical Seiko Instr & Electronics
Publication of CH634964GA3 publication Critical patent/CH634964GA3/fr

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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/0064—Visual time or date indication means in which functions not related to time can be displayed
CH492479A 1978-05-26 1979-05-25 Dispositif detecteur de champ magnetique pour piece d'horlogerie. CH634964B (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6299678A JPS54155079A (en) 1978-05-26 1978-05-26 Magnetic field detector for electronic watch

Publications (2)

Publication Number Publication Date
CH634964B true CH634964B (fr)
CH634964GA3 CH634964GA3 (fr) 1983-03-15

Family

ID=13216483

Family Applications (1)

Application Number Title Priority Date Filing Date
CH492479A CH634964B (fr) 1978-05-26 1979-05-25 Dispositif detecteur de champ magnetique pour piece d'horlogerie.

Country Status (6)

Country Link
US (1) US4321519A (fr)
JP (1) JPS54155079A (fr)
CH (1) CH634964B (fr)
DE (1) DE2920894C2 (fr)
FR (1) FR2426999A1 (fr)
GB (1) GB2023891B (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5515054A (en) * 1978-07-19 1980-02-01 Seiko Instr & Electronics Ltd Electronic watch
US4321521A (en) * 1978-12-25 1982-03-23 Kabushiki Kaisha Daini Seikosha Detection device of electronic timepiece
JPS55147381A (en) * 1979-05-04 1980-11-17 Seiko Instr & Electronics Ltd Detector for electronic watch
GB2134290B (en) * 1982-12-16 1986-02-26 Suwa Seikosha Kk An analog electronic timepiece
CH671135GA3 (en) * 1987-12-11 1989-08-15 Control method for stepper motor - using magnetic field detector allowing compensation for ambient magnetic field by adjusting drive pulses
US5600611A (en) * 1995-10-04 1997-02-04 Timex Corporation Wrist mountable compass
JP3508444B2 (ja) * 1997-02-07 2004-03-22 セイコーエプソン株式会社 ステッピングモーターの制御装置、その制御方法および計時装置
US6327225B1 (en) * 1998-12-14 2001-12-04 Seiko Epson Corporation Electronic unit, and control method for electronic unit
JP3395786B1 (ja) * 2002-02-26 2003-04-14 セイコーエプソン株式会社 電子機器、電子機器の受信制御方法および電子機器の受信制御プログラム
JP5711910B2 (ja) * 2010-07-29 2015-05-07 セミコンダクター・コンポーネンツ・インダストリーズ・リミテッド・ライアビリティ・カンパニー モータ駆動回路
EP2993534A1 (fr) * 2014-09-05 2016-03-09 EM Microelectronic-Marin SA Circuit détecteur de chocs
EP3171231B1 (fr) * 2015-11-18 2018-06-06 ETA SA Manufacture Horlogère Suisse Circuit detecteur de chocs et son procede de fonctionnement

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756010A (en) * 1970-08-11 1973-09-04 Matsushita Electric Works Ltd Magnetic-induction clock
US4158287A (en) * 1976-08-12 1979-06-19 Citizen Watch Company Limited Driver circuit for electro-mechanical transducer

Also Published As

Publication number Publication date
DE2920894A1 (de) 1979-11-29
GB2023891B (en) 1982-09-15
GB2023891A (en) 1980-01-03
FR2426999B1 (fr) 1983-08-19
DE2920894C2 (de) 1983-10-13
CH634964GA3 (fr) 1983-03-15
US4321519A (en) 1982-03-23
FR2426999A1 (fr) 1979-12-21
JPS54155079A (en) 1979-12-06
JPS6120821B2 (fr) 1986-05-23

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