EP0101410A2 - Elektromechanische Uhr, die mit einem Magnetschirm ausgestattet ist - Google Patents

Elektromechanische Uhr, die mit einem Magnetschirm ausgestattet ist Download PDF

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Publication number
EP0101410A2
EP0101410A2 EP83810327A EP83810327A EP0101410A2 EP 0101410 A2 EP0101410 A2 EP 0101410A2 EP 83810327 A EP83810327 A EP 83810327A EP 83810327 A EP83810327 A EP 83810327A EP 0101410 A2 EP0101410 A2 EP 0101410A2
Authority
EP
European Patent Office
Prior art keywords
motor
electro
screen
coil
plate
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.)
Withdrawn
Application number
EP83810327A
Other languages
English (en)
French (fr)
Other versions
EP0101410A3 (de
Inventor
Jean-Claude Schaffner
Jacques Mueller
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.)
ETA SA Manufacture Horlogere Suisse
Ebauchesfabrik ETA AG
Original Assignee
Ebauchesfabrik ETA AG
Eta SA Fabriques dEbauches
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 Ebauchesfabrik ETA AG, Eta SA Fabriques dEbauches filed Critical Ebauchesfabrik ETA AG
Publication of EP0101410A2 publication Critical patent/EP0101410A2/de
Publication of EP0101410A3 publication Critical patent/EP0101410A3/de
Withdrawn legal-status Critical Current

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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
    • G04C3/008—Mounting, assembling of components
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B43/00—Protecting clockworks by shields or other means against external influences, e.g. magnetic fields

Definitions

  • the present invention relates to electro-mechanical watches. It relates, more particularly, to an electro-mechanical watch comprising a magnetic screen for the protection of its motor.
  • the object of the present invention is to remedy these drawbacks.
  • This object is achieved by using, as a screen, a curved strip of soft magnetic material, advantageously in an arc, which extends only on the peripheral part of the movement closest to the motor and the two end portions of which extend at least as far as the ends of the motor coil.
  • the watch according to the invention comprises a support structure which comprises a bottom 10 forming a plate and a side wall 12 forming a middle part.
  • this structure is made of plastic by injection, in a single piece, and at the same time forms the watch case. This is completed by a crystal 14 and a dial 16.
  • a stepping motor 18 is mounted on the base plate 10. It essentially consists of a stator 20, a coil 22 surrounding a core 23 and a rotor 24. The latter drives a gear train shown very schematically at 26, which itself drives the hands 28.
  • the control member of the watch consists of a rod shown schematically at 30.
  • the plate also carries, quite conventionally, a battery, a resonator quartz and an integrated circuit which have not been shown in the figures.
  • the middle 12, of generally circular shape, comprises, at the height of the motor 18 and only in its closest portion thereof, a groove 32 in an arc of a circle and perpendicular to the plane of the plate.
  • This groove which is advantageously provided during the injection operation, serves as a housing for a magnetic screen 34 intended to protect the motor against the influence of external magnetic fields.
  • the screen 34 consists of a curved strip of soft magnetic material, advantageously a soft iron of very high purity, for example that known under the name of Sulem H4, sold by the house of Matthey SA, La Neuveville. Its thickness is typically 0.5 mm.
  • the dial 16 maintains this screen in place.
  • the screen 34 embraces the entire volume occupied by the motor 18. It would be sufficient, however, for the two terminal portions of the screen to be opposite the respective ends of the coil 22. It has in fact been observed that it is this part of the motor which is, by far, the most sensitive to parasitic magnetic fields and, more especially, to components parallel to the axis of the coil.
  • the proposed magnetic screen since it consists not of a ring but simply of a ring portion, can be obtained by cutting and forming a strip, which avoids the loss of material and allows the use of simple and easy-to-sharpen tools.
  • This solution also makes it possible, of course, to avoid the problem of the passage of the control member of the watch.
  • the present invention is not limited to the single embodiment which has just been described and that the scope of this patent also extends to the variant embodiments of all or part of the arrangements described, remaining within the scope equivalences.
  • the invention has been described with reference to to a watch whose injected plastic case constitutes, at the same time, the plate and the middle part. It is obvious, however, that the invention also applies in the case of more conventional structures, when the plate and the middle part are separate or the plate does not constitute the back of the watch.
  • the magnetic screen can then be mounted either in the middle or in the plate itself.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
EP83810327A 1982-08-16 1983-07-19 Elektromechanische Uhr, die mit einem Magnetschirm ausgestattet ist Withdrawn EP0101410A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH489082 1982-08-16
CH4890/82 1982-08-16

Publications (2)

Publication Number Publication Date
EP0101410A2 true EP0101410A2 (de) 1984-02-22
EP0101410A3 EP0101410A3 (de) 1984-03-28

Family

ID=4284320

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83810327A Withdrawn EP0101410A3 (de) 1982-08-16 1983-07-19 Elektromechanische Uhr, die mit einem Magnetschirm ausgestattet ist

Country Status (2)

Country Link
EP (1) EP0101410A3 (de)
JP (1) JPS5981580A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100861887B1 (ko) * 2000-11-24 2008-10-09 코닌클리케 필립스 일렉트로닉스 엔.브이. 수직 필드 ｍｒｉ 장치에서 서브-샘플링을 이용하여ｍｒｉ 이미지들을 보기 위한 방법

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4618120B2 (ja) * 2005-12-22 2011-01-26 セイコーエプソン株式会社 アンテナ内蔵式電子時計
JP4535185B2 (ja) * 2008-09-26 2010-09-01 カシオ計算機株式会社 電波腕時計

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2645158A1 (de) * 1975-10-08 1977-04-21 Seiko Instr & Electronics Uhrgehaeuse
JPS5510532A (en) * 1978-07-08 1980-01-25 Citizen Watch Co Ltd Antimagnetic structure for crystal watch
DE2918373A1 (de) * 1979-05-07 1980-11-13 Zimmermann Walter Vorrichtung zur abschirmung von empfindlichen anzeigeinstrumenten
US4317188A (en) * 1977-02-17 1982-02-23 Kabushiki Kaisha Suwa Seikosha Magnetic shielding plate for a step motor in an electronic wristwatch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2645158A1 (de) * 1975-10-08 1977-04-21 Seiko Instr & Electronics Uhrgehaeuse
US4317188A (en) * 1977-02-17 1982-02-23 Kabushiki Kaisha Suwa Seikosha Magnetic shielding plate for a step motor in an electronic wristwatch
JPS5510532A (en) * 1978-07-08 1980-01-25 Citizen Watch Co Ltd Antimagnetic structure for crystal watch
DE2918373A1 (de) * 1979-05-07 1980-11-13 Zimmermann Walter Vorrichtung zur abschirmung von empfindlichen anzeigeinstrumenten

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 4, no. 39 (P-4) (521), 28 mars 1980 & JP-A-55 010 532 (CITIZEN TOKEI K.K.) (25-01-1980) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100861887B1 (ko) * 2000-11-24 2008-10-09 코닌클리케 필립스 일렉트로닉스 엔.브이. 수직 필드 ｍｒｉ 장치에서 서브-샘플링을 이용하여ｍｒｉ 이미지들을 보기 위한 방법

Also Published As

Publication number Publication date
EP0101410A3 (de) 1984-03-28
JPS5981580A (ja) 1984-05-11

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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PUAL Search report despatched

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AK Designated contracting states

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18D Application deemed to be withdrawn

Effective date: 19841129

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SCHAFFNER, JEAN-CLAUDE

Inventor name: MUELLER, JACQUES