公开(公告)号：US20210181679A1

公开(公告)日：2021-06-17

申请号：US16767778

申请日：2018-12-03

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 ,  Bapitste HINAUX ,  Donald Willan CORSON ,  Michel WILLEMIN

IPC: G04B17/22

Abstract: A balance for timepieces includes a rim, a hub, and at least one arm connecting the hub to the rim. At least one portion of the balance is made of an at least partially amorphous metal alloy. The at least partially amorphous metal alloy is based on an element chosen from the group consisting of platinum, zirconium and titanium, and has a coefficient of thermal expansion comprised between 7 ppm/° C. and 12 ppm/° C. The balance can be manufactured by moulding. A resonator can include such a balance and a monocrystalline quartz balance spring.