Invention Grant
- Patent Title: Crystal resonator
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Application No.: US15486313Application Date: 2017-04-13
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Publication No.: US10425059B2Publication Date: 2019-09-24
- Inventor: Shigeru Obara , Tetsuya Sato , Masaaki Nakahara , Tomonori Shibazaki , Yuki Oi , Yuya Nishimura
- Applicant: NIHON DEMPA KOGYO CO., LTD.
- Applicant Address: JP Tokyo
- Assignee: NIHON DEMPA KOGYO CO., LTD.
- Current Assignee: NIHON DEMPA KOGYO CO., LTD.
- Current Assignee Address: JP Tokyo
- Agency: JCIPRNET
- Priority: JP2016-080528 20160413
- Main IPC: H03H9/17
- IPC: H03H9/17 ; H03H3/04 ; H03H9/02

Abstract:
A crystal resonator includes a crystal element and excitation electrodes. The crystal element has a pair of principal surfaces parallel to an X′-axis and a Z′-axis. The X′-axis is an axis of rotating an X-axis as a crystallographic axis of a crystal in a range of 15 degrees to 25 degrees around a Z-axis as a crystallographic axis of the crystal. The Z′-axis is an axis of rotating the Z-axis in a range of 33 degrees to 35 degrees around the X′-axis. The excitation electrodes are formed on the respective principal surfaces of the crystal element. Elliptical mesa portions or elliptical inverted mesa portions are formed on the respective principal surfaces. The mesa portions project from outer peripheries of the principal surfaces. The inverted mesa portions are depressed from the outer peripheries of the principal surfaces.
Public/Granted literature
- US20170302249A1 CRYSTAL RESONATOR Public/Granted day:2017-10-19
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