公开(公告)号：US20190079460A1

公开(公告)日：2019-03-14

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

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：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：US10983479B2

公开(公告)日：2021-04-20

申请号：US16104212

申请日：2018-08-17

Applicant: The Swatch Group Research and Development Ltd

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

IPC: G04B17/06 ,  G04C3/04 ,  H01L41/04 ,  H01L41/047 ,  H01L41/335 ,  H01L41/18 ,  H01L41/23 ,  H01L41/29 ,  H01L41/332 ,  H01L41/053

Abstract: A piezoelectric element for an automatic frequency control circuit, the element including: a balance spring formed of a strip of piezoelectric material; at least a first electrode, configured to be connected to the circuit and being disposed on all or part of one side of the strip; at least a second electrode configured to be connected to the circuit and being disposed on all or part of another one side of the strip distinct from the one side on which the first electrode is disposed, the piezoelectric material being a piezoelectric crystal or a piezoelectric ceramic; and at least two discontinuous layers of an insulating material, each discontinuous layer being disposed on at least one side of the strip and separating the first electrode from the second electrode, the layers of insulating material being distributed on predetermined portions of the balance spring substantially forming arcs in a predetermined angular periodicity.