Ultrasonic transducer with piezoelectric element, manufacturing method and distance sensor
A technology of ultrasonic transducers and piezoelectric elements, applied in the direction of piezoelectric/electrostrictive transducers, sensors, electrical components, etc., can solve complex steps, affect signal quality and other problems, achieve low cost and reduce susceptibility to interference sexual effect
Active Publication Date: 2018-03-30
ROBERT BOSCH GMBH
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Problems solved by technology
In the case of this signal strength, small electromagnetic interference can also significantly affect the signal quality
[0005] Furthermore, for example in DE 102 61 033 A1 a connection structure is known, which is based on a multi-core cable, but this entails complex steps in the automated production
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[0031] figure 1 An ultrasonic transducer according to the present invention is shown, which has a piezoelectric element 10, a printed circuit board 20, and a diaphragm 30. The piezoelectric element 10 is bonded on the front end side 32 of the diaphragm 30, preferably by means of a film, which forms a unit after bonding with the piezoelectric element 10. The printed circuit board 20 carries two signal connection locations 22, which are arranged as plane conductors. The signal connection point 22 is arranged on a section 24 of the printed circuit board 22 that protrudes into the diaphragm 30. The section 24 is constructed as a protrusion of the printed circuit board 20. The piezoelectric element 10 is connected to the signal connection part 22 through two lines 40 and 42.
[0032] The piezoelectric element 10 includes electrode surfaces 12, 14, and an electrode gap having an electrode gap width 16 is constructed between the electrode surfaces. Contact points 50, 52 are formed on...
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An ultrasonic transducer comprises a piezoelectric element 10, with a printed circuit board 20 and with a diaphragm pot 30. The piezoelectric element is attached to the front face 32 of the diaphragm pot and connected via at least two leads 40,42 to signal connection points 22 of the printed circuit board 20. In one arrangement a portion 24 of the circuit board projects into the diaphragm pot. The portion of the PCB may be smaller in width than the clear width of the diaphragm pot, and the remainder of the PCB may be arranged outside the pot. Alternatively the leads 40,42 (e.g. wires, single core cables) are arranged so that they run with a spacing from one another which is smaller than half the width of the piezoelectric element, preferably no more than the electrode gap width of the element 10. The transducer may be attached to a panel of a motor vehicle and used as a distance sensor . The distance sensor includes the ultrasonic transducer and also an acoustic damping ring 72 and a housing 70.
Description
Technical field [0001] The invention relates to an ultrasonic transducer and a distance sensor with piezoelectric elements and a method for manufacturing the ultrasonic transducer. Background technique [0002] Especially in automotive applications, it is known to detect the distance to an object by means of the pulse echo method. One process is to send scan pulses with the help of ultrasonic transducers, receive echoes and calculate distances based on the propagation time, where piezoelectric elements are used as transducer elements. [0003] Such an ultrasonic transducer is installed in a distance sensor in the outer cover of the vehicle in order to realize, for example, a parking assist or collision warning system. [0004] Piezoelectric sensors are used in particular to receive ultrasonic echoes, in which piezoelectric elements generate voltages of several millivolts. In the case of this signal strength, small electromagnetic interference will also significantly affect the sign...
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IPC IPC(8): H04R17/00
CPCG01S7/521G01S15/931G10K9/122G10K9/22G10K11/004G01H11/08G01S7/52079
Inventor B·巴亚尔塞汉M·施耐德P·拉普斯T·S·舍费尔
Owner ROBERT BOSCH GMBH