发明名称 |
Ultrasonic sensor for high temperature and manufacturing method thereof |
摘要 |
Provided is an ultrasonic sensor which includes a piezoelectric vibrator made of a lithium niobate (LN) single crystal and may be used in a high temperature region by generating a high ultrasonic wave output, and prevents cracks from being generated in the crystal. A piezoelectric vibrator 1 of the present invention has a surface (Y-axis 36° cut surface) obtained by rotating a surface orthogonal to a Y-axis of the LN crystal about an X-axis by 36°±2° as an output surface. The ultrasonic sensor further includes a retarder 3 made of titanium and a bonding layer 2 for bonding one surface of the retarder 3 to the output surface. The bonding layer 2 is made of silver and frit glass, and the frit glass has a coefficient of linear expansion ranging from 5×10−6 K−1 to 15×10−6 K−1. |
申请公布号 |
US9494453(B2) |
申请公布日期 |
2016.11.15 |
申请号 |
US201414398374 |
申请日期 |
2014.03.25 |
申请人 |
WOOJIN INC.;SONIC CORPORATION |
发明人 |
Nam Ki Han;Joo Hyeon Kyu;Tonosaki Minehiro;Ikarashi Fumiyasu;Kawaguchi Hideo;Saito Noriaki |
分类号 |
G01F1/66;G01N29/22;H04R17/00;G01N29/24 |
主分类号 |
G01F1/66 |
代理机构 |
Baker & Hostetler LLP |
代理人 |
Baker & Hostetler LLP |
主权项 |
1. An ultrasonic sensor, comprising:
a piezoelectric vibrator which is made of lithium niobate and has a surface obtained by rotating a surface orthogonal to a Y-axis of a lithium niobate crystal about an X-axis by 36°±2° as an output surface; a retarder made of titanium; and a bonding layer for bonding one surface of the retarder to the output surface, wherein the bonding layer is made of silver and frit glass, and the frit glass has a coefficient of linear expansion ranging from 5×10−6 K−1 to 15×10−6 K−1. |
地址 |
Hwaseong-Si KR |