公开(公告)号：US20220199892A1

公开(公告)日：2022-06-23

申请号：US17651483

申请日：2022-02-17

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Shigeo OJIMA ,  Masaki USHIRO

IPC: H01L41/047 ,  H03H9/19 ,  H03H3/02

Abstract: A piezoelectric vibrator having a piezoelectric vibration element that includes a piezoelectric piece and a pair of electrodes that face each other with the piezoelectric piece interposed therebetween; a holder that accommodates the piezoelectric vibration element; a resin layer covering at least one electrode of the pair of electrodes; and a water-repellent layer, which has a lower moisture permeability than the resin layer, between the electrode and the resin layer.

公开(公告)号：US20220158618A1

公开(公告)日：2022-05-19

申请号：US17586950

申请日：2022-01-28

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Shigeo OJIMA ,  Masaki USHIRO ,  Hiroyuki YAMAMOTO

IPC: H03H9/19 ,  H03H3/02 ,  H03H9/10 ,  H01L41/18

Abstract: A crystal vibrator that includes a crystal vibration element having a crystal piece and a pair of electrodes that face each other with the crystal piece interposed therebetween; and a holder that accommodates the crystal vibration element. At least one electrode of the pair of electrodes includes an upper layer containing gold and a lower layer between the crystal piece and the upper layer and containing chromium. A surface of the at least one electrode contains a plurality of crystal grains composed of gold and a chromium compound along grain boundaries between the plurality of crystal grains. An area percentage of the plurality of crystal grains is equal to or more than 35% and equal to or less than 60% when the surface of the at least one electrode is viewed in a plan view thereof.