The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 15, 2016
Filed:
Mar. 25, 2014
Woojin Inc., Hwaseong-si, KR;
Sonic Corporation, Tokyo, JP;
Ki Han Nam, Hwaseong-si, KR;
Hyeon Kyu Joo, Hwaseong-si, KR;
Minehiro Tonosaki, Tokyo, JP;
Fumiyasu Ikarashi, Tokyo, JP;
Hideo Kawaguchi, Tokyo, JP;
Noriaki Saito, Tokyo, JP;
WOOJIN INC., Hwaseong-Si, KR;
SONIC CORPORATION, Tokyo, JP;
Abstract
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 vibratorof 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 retardermade of titanium and a bonding layerfor bonding one surface of the retarderto the output surface. The bonding layeris made of silver and frit glass, and the frit glass has a coefficient of linear expansion ranging from 5×10Kto 15×10K.