EP 1202249 A1 20020502 - Waterproof transducer for half-wavelength array
Title (en)
Waterproof transducer for half-wavelength array
Title (de)
Wasserdichter Wandler für Halbwellenwandleranordnung
Title (fr)
Transducteur étanche pour une array à demi-longeur d'onde
Publication
Application
Priority
EP 00402981 A 20001026
Abstract (en)
The ultrasonic transducer device (10) for a lambda /2 ultrasonic sensor phased array comprises a rectangular housing having thin sidewalls (13), having a height h, and having a rectangular or elliptical membrane (12) attached to the upper extremities of the sidewalls, and having a longer side A and a shorter side a1, and a vibrator (11) attached to said membrane (12) for causing said membrane to vibrate. According to the present invention, the thickness e of the sidewalls fulfils the following equation <DF>e/a1 = d1-a1 DIVIDED 2a1 ≤1 DIVIDED 8 with d1 ≤ lambda /2, </DF> the height h fulfils the following equation <DF>0.1 x d1 ≤ h < 0.6 x d1, with d1 = lambda /2 </DF> so as to avoid generation of parasitic flexural vibration of said sidewalls, and the longer side A has the following relation with the shorter side a1: <DF>1.5 x a1 ≤ A ≤ 3 x a1. </DF> The device is sensitive and robust and may be used for indoor and outdoor applications such as parking-aid systems for vehicles. <IMAGE>
IPC 1-7
IPC 8 full level
G10K 9/125 (2006.01); G10K 11/00 (2006.01); G10K 13/00 (2006.01)
CPC (source: EP)
G10K 9/125 (2013.01); G10K 11/004 (2013.01); G10K 13/00 (2013.01)
Citation (search report)
- [A] WO 9202795 A2 19920220 - BOSCH GMBH ROBERT [DE]
- [A] US 3492633 A 19700127 - MASSA FRANK
- [A] DE 1183287 B 19641210 - AEROPROJECTS INC
- [A] EP 0075302 A1 19830330 - GELHARD EGON
Designated contracting state (EPC)
FR
DOCDB simple family (publication)
DOCDB simple family (application)
EP 00402981 A 20001026