JPH0293897U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a structural diagram of an embodiment of an airborne ultrasonic transducer according to the present invention, where a is a perspective view of the exterior, b is a longitudinal front view passing through the center, and Fig. 2 is an example of a conventional airborne ultrasonic transducer. In the structural drawings, a is an external perspective view, and b is a longitudinal sectional front view passing through the center. In addition, 1: vibration element, 2: outer casing, 3: bottom plate, 4
: Holding tube, 5a, 5b: Terminal, 6: Shielding plate, 7:
Shielding wall, 8: Shielding tube, 9a, 9b: Lead wire, 1
0: Inner opening, 11: Outer opening, 12: Groove.

Claims (1)

[Scope of utility model registration request] A cylindrical holding cylinder 4 whose one end is fixed at the position of the ring-shaped bending vibration node of the disc-shaped piezoelectric vibrating element 1
The bottom plate 3 is provided with a groove 12 having a V-shaped cross section along the outer periphery of the holding cylinder 4 to which the other end is fixed, and an inner opening 10 is opened on the upper surface of the inner portion of the vibration node, and the upper surface of the outer portion is opened on the bottom plate 3. A ring-shaped shielding plate 6 for covering, a cylindrical shielding wall 7 hanging from the outer peripheral edge, and a cylindrical shielding tube 8 separated by an outer opening 11 keeping a constant gap in the outer circumference are integrally formed. Aerial ultrasonic wave transmission and reception in which a housing 2 is attached and the length of the propagation path from the outer part of the node to the outer opening 11 via the bottom of the groove 12 is an integral multiple of the resonant wavelength of the vibrating element 1. vessel.