TWM461061U - Anisotropic ultrasonic detecting device - Google Patents

Description

Anisotropic ultrasonic detector

The present invention relates to an ultrasonic detector for detecting the presence of an object and/or measuring the distance from the object, and more particularly to a diverging and receiving wave field having a relatively wide horizontal direction and a relatively narrow vertical direction. The anisotropic ultrasonic detector.

Ultrasonic detectors are suitable for a variety of applications where objects are detected. Typical uses for ultrasonic detectors include detection and range finding of target objects. For example, the distance measurement required for camera and camera focusing, or the use of ultrasonic waves for obstacle detection at the rear end of the vehicle are examples of common applications. Among various examples, ultrasonic detectors utilize piezoelectric elements to generate ultrasonic waves for performing such functions. In most cases, the same ultrasonic detector is often utilized as a dual function device for ultrasonic transmitters and ultrasound receivers. In other words, the same ultrasonic device is responsible for generating ultrasonic waves that are used for scanning and/or ranging, and for receiving reflected ultrasonic waves.

Whether in the transmitting or receiving mode of operation, the divergence of an ultrasonic detector and the shape of the receiving wave field often have an important influence on its application. For example, in the use of monitoring the periphery of the rear end of the vehicle, Both the imaging and receiving ultrasonic wave coverage fields usually need to be shaped to achieve optimal operation. In general, both of the coverage fields require a field shape that is relatively wide in the horizontal direction and relatively narrow in the vertical direction. A wide horizontal launch coverage field shape can increase the effective range of angles to avoid missing objects behind the vehicle that is being reversed. On the other hand, a lower narrow vertical scanning angle reduces the possibility of interference from the reflected waves reflected from the ground.

Wherein, the ultrasonic detector applied to the vehicle rear-end monitoring system receives the cover field shape under the operation mode, and should basically be the same as or similar to the mode of the emission mode.

In order to meet the above requirements, as shown in FIG. 5, a current method is to adjust and adjust the configuration of the housing 40 of the ultrasonic detector. The prior art ultrasonic detector includes a housing 40 and a housing. The sheet-shaped piezoelectric element 50 includes a bottom wall 41 and a side wall 42. The side wall 42 is axially extended and formed on the periphery of the bottom wall 41. The bottom wall 41 and the side wall 42 are shaped together. The piezoelectric element 50 is adhesively attached to the bottom wall 41; wherein the accommodating groove has an elongated cross section, thereby generating a radiation coverage field shape close to the ideal ultrasonic wave.

In an ideal case, after the piezoelectric element 50 stops generating or receiving ultrasonic waves, the piezoelectric element 50 and the housing 40 should stop vibrating. However, as shown in Fig. 6, in the actual case, the test is carried out using a sensitivity box. The test condition is that the obstacle (Φ 60 PVC water pipe) is 90 cm away from the existing ultrasonic detector, and the back vibration specification is 0.8 to 1.5 milliseconds. After the piezoelectric element 50 and the housing 40 are used, the vibration is not stopped but a large vibration is generated. The waveform of the blessing, as shown in FIG. 6, is the region A, that is, the post-vibration. This phenomenon is caused by defects in the process: the bottom wall 41, the sidewall 42 and the piezoelectric element 50 have uneven thicknesses, respectively. After the piezoelectric element 50 is adhesively attached to the bottom wall 41, the total thickness of the piezoelectric element 50, the dispensing and the bottom wall 41 is not uniform; resulting in the piezoelectric element 50 and the shell The body 40 stores energy during use and generates post-vibration after use, which makes the prior art ultrasonic detector less reliable and affects its measurement effect.

In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an anisotropic ultrasonic detector that produces a near-ideal ultrasonic radiation coverage field shape without still generating post-vibration and having better reliability. .

In order to achieve the aforementioned novel object, the technical means adopted by the present invention is to create an anisotropic ultrasonic detector comprising: a housing comprising a bottom wall and a side wall, the side wall being axially extended and formed a receiving groove is formed between the inner surface of the side wall and the inner side surface of the side wall, the receiving groove has a long cross section; and a piezoelectric element is fixed on the inner side of the bottom wall a central position; a vibrating member whose both ends closely abut the side wall and is located on the top side of the piezoelectric element, and has a hardness greater than the hardness of the housing.

Since the vibration-damping member is fastened to the side wall, the back-vibration generated by the casing is pressed, and the piezoelectric element disposed on the casing is then pressed, and the whole is used. After the vibration cannot be generated, the advantage of the novel is that it has better reliability and measurement effect while generating a near-ideal ultrasonic radiation coverage field shape.

On the other hand, the novel uses the difference in hardness between the vibration damper and the casing to combine the two, which has the advantage of saving cost and time in the process.

10‧‧‧shell

11‧‧‧ bottom wall

12‧‧‧ side wall

121‧‧‧ Straight line

122‧‧‧Circular segments

123‧‧‧curved segments

13‧‧‧ Groove

20‧‧‧Piezoelectric components

30‧‧‧Vibration parts

40‧‧‧shell

41‧‧‧ bottom wall

42‧‧‧ side wall

50‧‧‧Piezoelectric components

A‧‧‧ area

Figure 1 is a perspective view of the present invention.

Figure 2 is a top view of the present invention.

Figure 3 is a side cross-sectional view of the present invention.

Figure 4 is a waveform diagram of the present invention.

Figure 5 is a top view of the prior art.

Fig. 6 is a waveform diagram of the prior art.

In the following, in conjunction with the drawings and the preferred embodiment of the present invention, the technical means adopted by the present invention for the intended purpose are further explained.

As shown in FIG. 1, the anisotropic ultrasonic detector of the present invention comprises a housing 10, a piezoelectric element 20 and a vibrating member 30.

As shown in FIG. 1 , the housing 10 includes a bottom wall 11 and a side wall 12 extending axially from the periphery of the bottom wall 11 . The inner surface of the side wall 12 and the inner side of the side wall 11 . Forming a receiving groove, the cross section of the receiving groove is elongated, thereby generating a radiation coverage field shape close to the ideal ultrasonic wave; in this embodiment, as shown in FIG. 1 to FIG. 3, the cross section of the receiving groove Forming a substantially dumbbell-shaped peripheral curve having a pair of symmetrically opposed straight lines 121 parallel to the direction of the long axis of the dumbbell, and forming the dumbbell shape opposite to each other at both ends of the long axis of the dumbbell Expanding the two arc segments 122 of the head, and joining the arc segments 122 An arcuate line segment 123 corresponding to the adjacent straight line 121.

However, as will be understood by those of ordinary skill in the art, the cross section of the accommodating groove can also be formed into a substantially rectangular, elliptical, teardrop shape or the like before the cross section of the accommodating groove is elongated. The peripheral curve is applicable to this new model.

As shown in FIG. 1 to FIG. 3, the piezoelectric element 20 is disposed at a central position of the inner side surface of the bottom wall 11; generally, the piezoelectric element 20 is attached to the piezoelectric element 20 in a dispensing manner. On the bottom wall 11.

As shown in FIG. 1 to FIG. 3, the vibrating member 30 has its two ends closely contacting the side wall 12, so that the relative positions of the vibrating members 30 are fixed, and the vibrating member 30 is located at the pressure. The top side of the electrical component 20, and the hardness thereof is greater than the hardness of the housing 10; in the embodiment, the vibration-damping member 30 is an elongated piece passing through the central axis of the bottom wall 11, At the same time, the long axis is along the long axis of the dumbbell, and the two ends thereof closely abut the two arc segments 122 of the dumbbell shape.

Further, since the hardness of the vibrating member 30 is greater than the hardness of the housing 10, when the vibrating member 30 is in close contact with the side wall 12, the inner surface of the side wall 12 is The contact of the vibrating member 30 will inevitably be slightly deformed, thereby producing the groove 13 as shown in FIGS. 1 to 3; even though the groove 13 can be formed when the side wall 12 is formed, The side wall 12 is used as the vibration damper 30 in combination with the casing 10, but in order to save cost and time in the process, it is preferred to use the vibration damper 30 and the The difference in hardness between the casings 10 allows the vibration damper 30 to be combined with the casing 10 without presetting the recesses 13.

The new type of anisotropic ultrasonic detector is tested by using a sensitivity box. The test condition is that the obstacle (Φ 60 PVC water pipe) is 90 cm away from the anisotropic ultrasonic detector of the present type, and the post-vibration specification is 0.8 to 1.5 milliseconds. The waveform diagram obtained by the test is shown in Fig. 4, and at the same time, referring to Fig. 6; the anisotropic ultrasonic detector of the present invention is shown, and after use, the vibration is stopped immediately, and the waveform of the large vibration is not generated ( In the area A) referred to in Fig. 6, the anisotropic ultrasonic detector of the present invention has no post-vibration phenomenon.

It can be seen from the foregoing that the present invention differs from the prior art only in the vibration damper 30, and it can be inferred from the above test results that when the piezoelectric element 20 stops generating or receiving ultrasonic waves, and the piezoelectric element 20 and the When the housing 10 is stored with a certain amount of energy, since the vibration-damping member 30 is fastened against the side wall 12, the rear vibration generated by the housing 10 is pressed and coupled to the housing 10 After the piezoelectric element 20 is pressed, the vibration is also suppressed, and the whole vibration cannot be generated after use, whereby the novel system has better reliability and measurement effect.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the present invention has been disclosed above in the preferred embodiments, it is not intended to limit the present invention, and any technology that is familiar with the present technology. A person skilled in the art can make some modifications or modifications to the equivalent embodiments by using the technical content disclosed above without departing from the spirit and scope of the present invention. Technical simplifications Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the present invention.

10‧‧‧shell

11‧‧‧ bottom wall

12‧‧‧ side wall

13‧‧‧ Groove

20‧‧‧Piezoelectric components

30‧‧‧Vibration parts

Claims (7)

An anisotropic ultrasonic detector comprising: a housing comprising a bottom wall and a side wall, the side wall extending axially formed on a periphery of the bottom wall, an inner surface of the side wall and an inner side surface of the side wall Forming a receiving groove, the receiving groove has a long section; a piezoelectric element is fixed at a central position of the inner side surface of the bottom wall; and a vibrating member has two ends closely adjacent to the side wall It is located on the top side of the piezoelectric element and has a hardness greater than the hardness of the housing. The anisotropic ultrasonic detector according to claim 1, wherein the cross section of the accommodating groove exhibits a substantially dumbbell-shaped peripheral curve having a pair of symmetrical pairs parallel to the longitudinal direction of the dumbbell shape. A straight line is formed, and two circular arc segments of the dumbbell-shaped expanded head are formed opposite to each other at opposite ends of the dumbbell-shaped long axis, and arcuate segments connecting the circular arc segments and the corresponding adjacent straight lines. The anisotropic ultrasonic detector according to claim 1, wherein the vibration-damping member passes through a central axis of the bottom wall. The anisotropic ultrasonic detector according to claim 2, wherein the two ends of the vibration-damping member are respectively closely opposed to the two circular arc segments of the dumbbell shape. The anisotropic ultrasonic detector according to claim 3, wherein the vibration-damping member is an elongated sheet. The anisotropic ultrasonic detector according to claim 4, wherein the vibration-damping member is elongated, the long axis thereof is along the long axis of the dumbbell shape, and the two ends thereof are respectively formed with the two circles of the dumbbell shape. The arc segments are closely offset. The anisotropic ultrasonic detector according to claim 6, wherein the vibration-damping member is an elongated sheet.