| 摘要 |
#CMT# #/CMT# The device has a disk i.e. ring, provided with high magnetic permeance and placed in a plane parallel to a plane of a balance spring of a timepiece, where the device is placed in a tourbillon. Another disk (2) and the balance spring (1) are mounted coaxially with respect to each another. The latter disk is mounted on a top of the ring, and is equipped with a set of branches made of same material. A star is mounted on the top of the ring. The ring, the disk or the star are made of high magnetic permeance material such as soft iron or an AFK502 type alloy iron-nickel. #CMT#USE : #/CMT# Device for protecting a balance spring of a timepiece against disturbing magnetic fields from an exterior of the timepiece. #CMT#ADVANTAGE : #/CMT# The device can divert the field lines in orthogonal and radial directions to the plane of the balance spring to avoid or decrease the longitudinal polarization, and can protect the balance spring of the timepiece irrespective of the direction of the disturbing field in the timepiece. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic sectional of a device for protecting a balance spring of a timepiece. 1 : Balance spring 2 : Disk 6 : Field lines. |
