公开(公告)号：US11480925B2

公开(公告)日：2022-10-25

申请号：US16494496

申请日：2018-03-16

Applicant: The Swatch Group Research and Development Ltd

Inventor： Lionel Tombez

IPC: G04B17/26 ,  G04B15/14

Abstract: The mechanical timepiece is equipped with a movement which includes an indicator mechanism of at least one time data item, a mechanical resonator forming a slave oscillator which paces the running of the indicator mechanism, and a mechanical correction device to prevent a possible time drift in the running of the indicator mechanism. The mechanical correction device is formed by a master mechanical oscillator and a mechanical braking device of the mechanical resonator, this braking device arranged to apply periodically to the mechanical resonator mechanical braking pulses at a braking frequency determined by the master mechanical oscillator. Then, the mechanical system, formed by the mechanical resonator and the braking device, is configured to enable the braking device to be able to start the braking pulses preferably at any position of the mechanical resonator. Preferably, the braking pulses have a duration of less than one quarter of a set-point period.

公开(公告)号：US10969745B2

公开(公告)日：2021-04-06

申请号：US16112817

申请日：2018-08-27

Applicant: The Swatch Group Research and Development Ltd

Inventor： Alexandre Haemmerli ,  Francois Gueissaz ,  Lionel Tombez ,  Bernhard Schnyder ,  Silvio Dalla Piazza

IPC: G04C3/04 ,  G04B17/06 ,  G04B17/22

Abstract: A piezoelectric element for an automatic frequency control circuit. The element includes a balance spring formed of a piezoelectric crystal strip, a first electrode connected to the automatic control circuit, and disposed on at least a first side of the strip, and a second electrode connected to the automatic control circuit and disposed on at least a second side of the strip. The first and second electrodes are placed on one portion or over the entire length of the balance spring in a predetermined angular distribution.

公开(公告)号：US20190196408A1

公开(公告)日：2019-06-27

申请号：US16150524

申请日：2018-10-03

Applicant: The Swatch Group Research and Development Ltd

Inventor： Alexandre Haemmerli ,  Francois Gueissaz ,  Jean-Claude Martin ,  Lionel Paratte ,  Yves Winkler ,  Gianni Di Domenico ,  Pascal Winkler ,  Jean-Luc Helfer ,  Lionel Tombez ,  Baptiste Hinaux ,  Donald William Corson ,  Michel Willemin

IPC: G04B17/22 ,  G04B17/06

CPC classification number: G04B17/227 ,  B22C9/00 ,  B22D15/00 ,  B22D25/026 ,  B22D27/04 ,  C22C14/00 ,  C22C16/00 ,  C22C21/00 ,  C22C38/08 ,  G04B17/063 ,  G04B17/066 ,  G04B17/222 ,  G04B18/006 ,  G04C3/04

Abstract: A process for producing a metal alloy balance wheel by molding, the process including the following steps: a) making a mold in the negative shape of the balance wheel, b) getting hold of a metal alloy that has a thermal expansion coefficient of less than 25 ppm/° C. and is able to be in an at least partly amorphous state when it is heated to a temperature between its glass transition temperature and its crystallization temperature, c) putting the metal alloy into the mold, the metal alloy being heated to a temperature between its glass transition temperature and its crystallization temperature so as to be hot-molded and to form a balance wheel, d) cooling the metal alloy to obtain a balance wheel made of the metal alloy, e) releasing the balance wheel obtained in step d) from its mold.