Magnetic protection for timepiece balance spring

A hairspring and timepiece technology, applied in protection against external influences, spring protection, mechanically driven clocks, etc., can solve problems such as no hairspring

Active Publication Date: 2011-03-30
THE SWATCH GRP RES & DEVELONMENT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in this document, regardless of the orientation of the magnetic field that exists in the plane of the hairspring, it does not protect the hairspring itself from stray magnetic fields

Method used

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  • Magnetic protection for timepiece balance spring
  • Magnetic protection for timepiece balance spring
  • Magnetic protection for timepiece balance spring

Examples

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Embodiment Construction

[0015] figure 1 is a schematic perspective view of a device according to the invention for protection against stray magnetic fields originating from outside the timepiece in a simplified manner. The device thus comprises at least one disc 2 of high magnetic permeability, arranged in a plane parallel to the plane of balance spring 1 , mounted on the timepiece. figure 1 It is also shown that this disc 2 and balance spring 1 are mounted coaxially with each other about an axis denoted by the letter Z.

[0016] Unlike the first document cited above (CH122391), it seems to us a more sensible solution to try to reduce or completely remove the stray magnetic field of the balance spring, thus proposing a heavy or cumbersome solution as stated above Yes, orienting or deflecting the stray magnetic field in such a way that it has less effect on the potential polarization of the magnetic material forming the balance spring, without necessarily reducing or removing the stray magnetic field...

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PUM

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Abstract

The device for protecting a timepiece balance spring (1) from stray magnetic fields includes at least one disc (2) with high magnetic permeability, arranged in a parallel plane to the plane of the balance spring, wherein the disc (2) and the balance spring are mounted coaxially with each other.

Description

technical field [0001] The invention relates to a device for protecting the balance spring of a timepiece from stray or parasitic magnetic fields originating externally to said timepiece. Background technique [0002] There are devices that protect timepieces from any type of external magnetic field, such as a permanent magnet or the field of an electric motor of any kind. [0003] The simplest and most radical solution consists in completely shielding the movement of the timepiece so that no magnetic field lines that disturb the magnetic field can penetrate it. This is the case proposed by patent CH122391, where the movement of the watch is protected by a set of elements formed of a highly penetrable, anti-rust alloy with low hysteresis, which forms a magnetic shield. These elements are: the inner cover placed between the movement and the back cover of the watch, the dust cover gasket that forms the cap between the movement and the case back, and the dial that is placed be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04B43/00
CPCG04B43/007G04B17/285G04B17/06
Inventor J-P·米格诺特J-J·伯恩
Owner THE SWATCH GRP RES & DEVELONMENT LTD
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