Ultrasonic transducer for automatically parking

Abstract

The invention relates to a transducer, in particular to an ultrasonic transducer for automatically parking. The ultrasonic transducer comprises a metal shell with a chamber, wherein the metal shell is internally provided with a piezoelectric ceramic piece; a silver-plated layer is arranged on the lower surface of the piezoelectric ceramic piece; the upper surface comprises a first silver plating region and a second silver plating region; the first silver plating region and the second silver plating region are separated; the first silver plating region is connected with an anode lead wire end; the second silver plating region is connected with a cathode lead wire end; the second silver plating region is communicated with the silver-plated layer of the lower surface through a side face metal body; and the silver-plated layer of the lower surface of the piezoelectric ceramic piece is fixed in the metal shell through an adhesive layer. With the adoption of the structure, the ultrasonic transducer for automatically parking has the highest conversion efficiency and is at the lowest energy consumption rate in a process; and the transducer obtains the high flexibility and a tested distance is far. Meanwhile, the metal shell is in a gradually-changed abnormal structure so that a sound field radiation angle is changed, the angle of the transducer is reduced and erroneous judgment is prevented.

Description

technical field [0001] The invention relates to a sensor, in particular to an ultrasonic sensor for automatic parking. Background technique [0002] Reversing is an action that ordinary cars often perform. In the narrow alleys or parking areas of the city, only relying on the driver's superb and skilled driving skills, it is very easy to avoid adjacent vehicles or obstacles. With the continuous advancement of industrial technology, most vehicles on the market have been equipped with reversing radar to assist the driver in reversing. It uses ultrasonic technology to detect whether the distance between the rear of the vehicle and the object behind the vehicle or the vehicle is less than the set value. When the distance of the rear object or vehicle is less than the set value, the driver will be notified by an alarm or other display methods as a reference for reversing, so as to avoid disturbing mutual collision accidents. [0003] The existing ultrasonic sensor for reversing ...

AI Technical Summary

Problems solved by technology

Since the piezoelectric ceramic sheet has positive and negative piezoelectric effects, after the ceramic sheet is energized, an inverse piezoelectric effect is generated to send out ultrasonic waves; when the ultrasonic wave encounters an obstacle, the feedback ultrasonic wave acts on the sensor, and the ceramic sheet converts mechanical energy into Electric energy, showing a positive piezoelectric effect, transmits the electrical signal to the central control circuit. Due to the adhesive layer and the sensor shell in the electrical circuit, the strength of the received signal is attenuated, resulting in a large sensitivity attenuation, resulting in a short test distance of the sensor.

Most of its structures adopt circular or square structures to increase the ratio between horizontal and vertical. This type of sensor has low sensitivity, short test distance and large angle.

Images