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
CN101995814BActive Publication Date: 2015-02-18THE SWATCH GRP RES & DEVELONMENT LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
THE SWATCH GRP RES & DEVELONMENT LTD
Publication Date
2015-02-18

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Abstract

#CMT# # / CMT# The device has a disk with high magnetic permeability, arranged in a plane parallel to a plane of a balance spring. The disk and the balance spring are mounted coaxially with each other while allowing magnetic field to reach the balance spring in a direction of the magnetic field. A ring (3) with the high magnetic permeability is mounted on the disk. The ring is arranged around the balance spring in a coaxial manner. The disk is made to fit with a set of branches (4) made of the same material as the disk and arranged in a star-form. #CMT#USE : # / CMT# Protecting device mounted in a tourbillon (claimed), for protecting a balance spring of a timepiece from stray / parasitic magnetic fields originating from outside timepiece. #CMT#ADVANTAGE : # / CMT# The device is designed to align field lines in more or less orthogonal and radial configuration to the plane of the balance spring, thus protecting the balance spring from the stray magnetic fields, using more compact and lighter structure. #CMT#DESCRIPTION OF DRAWINGS : # / CMT# The drawing shows a plan view of a device for protecting a timepiece balance spring. 3 : Ring 4 : Branches 10 : Escape wheel 13 : Balance 14 : Rotating cartridge.
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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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