Title:
ULTRASONIC SENSOR
Document Type and Number:
WIPO Patent Application WO/2019/058842
Kind Code:
A1
Abstract:
An ultrasonic sensor (101) comprises: a case (4) that has a base plate (3); and a piezoelectric vibration element (7) that is mounted on the base plate (3). The case (4) has an inner space (20) that is a concave portion recessed toward the base plate (3). When viewed from a direction perpendicular to the base plate (3), the inner space (20) has a shape in which a longitudinal direction (91) thereof is one direction that is parallel to the base plate (3). The case (4) includes a first part (41) that has a cylindrical shape and in which the diameter of the outer shape thereof in the longitudinal direction (91) is a first length D1 and a second part (42) that has a cylindrical shape and in which the diameter of the outer shape thereof in the longitudinal direction (91) is a second length D2 that is larger than the first length D1. The maximum length in the longitudinal direction (91) of a part of the inner space (20) that is inside the second part (42) is larger than the maximum length in the longitudinal direction (91) of a part of the inner space (20) that is inside the first part (41).
Inventors:
SATO TAKEHIRO (JP)
Application Number:
PCT/JP2018/030840
Publication Date:
March 28, 2019
Filing Date:
August 21, 2018
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H04R17/00
Foreign References:
| JP2002112395A | 2002-04-12 | |||
| JP2002262383A | 2002-09-13 | |||
| JP2002209294A | 2002-07-26 |
Other References:
See also references of EP 3687191A4
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
Download PDF:
Previous Patent: ELECTRODE, SECONDARY BATTERY, BATTERY PACK, AND VEHICLE
Next Patent: POSITION DETECTION SENSOR
Next Patent: POSITION DETECTION SENSOR