Title:
自動周波数制御回路用の圧電素子、それを備えた機械振動系および装置、ならびに圧電素子の製造方法
Document Type and Number:
Japanese Patent JP6633705
Kind Code:
B2
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.
Inventors:
Alexander hemmeri
Francois Geisha
Lionel Tombe
Bernhard Schneider
Silvio Dara Piazza
Francois Geisha
Lionel Tombe
Bernhard Schneider
Silvio Dara Piazza
Application Number:
JP2018166631A
Publication Date:
January 22, 2020
Filing Date:
September 06, 2018
Export Citation:
Assignee:
The Swatch Group Research and Development Limited
International Classes:
G04C3/04; G04B17/06; H03H3/02; H03H9/17; H03H9/19
Domestic Patent References:
| JP2002228774A | ||||
| JP2013096991A | ||||
| JP48071586A | ||||
| JP2011259426A |
Foreign References:
| KR1020110135341A | ||||
| CN101546965A | ||||
| WO2014203085A1 |
Attorney, Agent or Firm:
Shigeki Yamakawa
Masaki Yamakawa
Masaki Yamakawa