CN103256950A - Ultrasonic sensor device - Google Patents

Abstract

An ultrasonic sensor device includes: a hollow shell, a connecting pipe connected to the hollow shell, five pins, a sensor and a circuit board. One end of the pins is located on one side of the hollow shell. The first opening, the other ends of two pins are located in the second opening of the hollow shell, the other ends of the other three pins extend into the connecting pipe part and are located in a third opening of the connecting pipe part; the sensor has an opening And its side wall has a ground hole, the sensor is fixed on the second opening of the hollow shell, so that the other end of one of the pins extending to the second opening extends into the opening to be electrically connected to a piezoelectric piece, and The other end of the other pin extending to the second opening is inserted into the ground hole; the circuit board is disposed on the first opening of the hollow shell and is electrically connected to one end of the pins.

Description

Ultrasonic sensor device

technical field

The invention relates to a sensor, in particular to an ultrasonic sensor device.

Background technique

Referring to Fig. 1 and Fig. 2, an ultrasonic sensor device in the past has a hollow shell 1, a connecting pipe part 2 connected to the hollow shell 1 at one end, and a circuit board arranged in the hollow shell 1 11 and an ultrasonic sensor 3. The circuit board 11 is provided with three pins 12 . One end of the pins 12 is fixed on the circuit board 11 , and the other end extends into the connecting tube 2 and faces the opening 21 at the other end of the connecting tube 2 . As shown in Figure 2, the ultrasonic sensor 3 has an aluminum hollow casing 31, a piezoelectric sheet 32 arranged on the inner bottom surface of the hollow casing 31, and an adapter circuit board 33 arranged above the piezoelectric sheet 32 , and two wires 34, 35 electrically connected to the circuit board 33. The adapter circuit board 33 is electrically connected to the piezoelectric sheet 32 through a first wire 36, and is electrically connected to the hollow casing 31 through a second wire 37, and then transmits the first wire 36 through a wire 34. The signal is sent to the circuit board 11 , and the second wire 37 is connected to the circuit board 11 through the wire 35 to output the signal and ground through two pins 12 of the circuit board 11 .

However, when the second wire 37 is welded to the hollow shell 31 , since the hollow shell is made of aluminum, the solder joints are high and it is difficult to weld. In addition, the piezoelectric film 32 needs to be electrically connected to the circuit board 11 through the adapter circuit board 33, which not only increases the material cost, but also easily causes signal attenuation. , the wires 34, 35 also need to be soldered to the adapter circuit board 33 and the circuit board 11 respectively, thus increasing the man-hours and complexity of the manufacturing process, and relatively increasing the manufacturing cost.

Contents of the invention

Therefore, the purpose of the present invention is to provide an ultrasonic sensor device with a relatively simple structure, which can reduce material costs and is easy to assemble and electrically connect.

To achieve the above object, the ultrasonic sensor device of the present invention includes a housing, a sensor and a circuit board.

The shell includes a hollow shell, a connecting pipe part and five pins. The hollow shell has a first opening and a second opening which are opposite and communicated with each other. The shells are connected, and the other end has a third opening. The pins are fixed in the hollow shell, with one end facing the first opening, and the other ends of the two pins facing the second opening, and the other three The other end of the supporting leg extends into the connecting pipe portion and faces the third opening.

The sensor includes a hollow chamber formed by a surrounding wall and a bottom wall, a piezoelectric sheet arranged on the bottom wall, and a ground wire hole arranged on the surrounding wall, the sensor is fixed in the the second opening of the hollow housing, and make the hollow chamber and the ground wire hole face into the hollow housing, make the other end of one of the pins extending to the second opening extend into the hollow chamber of the sensor and It is electrically connected with the piezoelectric sheet, and the other end of the other pin extending to the second opening is inserted into the ground hole.

The circuit board is arranged on the first opening of the hollow casing and is electrically connected with one end of the pins.

Preferably, the ultrasonic sensor device further includes an annular seat, and the sensor is fixed on the annular seat, and then fixed on the housing by the annular seat being engaged with the first opening of the hollow casing.

Preferably, the rear end portion of the surrounding wall of the sensor is exposed outside the housing, and the ultrasonic sensor further includes an O-ring, which is sleeved on the rear end portion of the sensor surrounding the wall to cover the surrounding wall the backend part of the .

Preferably, the ultrasonic sensor device further includes an isolation cover covering the circuit board.

Preferably, the pin whose other end extends to the hollow chamber of the sensor is a first signal pin, the pin whose other end is inserted into the ground hole of the sensor is a first ground pin, and the other The three pins extending from one end to the connecting tube are respectively a second signal pin, a second ground pin and a power pin, and the circuit board is provided with five through holes for one end of these pins Through and electrically connected, the first signal pin outputs a sensing signal to the circuit board, and after being processed by the circuit board, it is output to the second signal pin, and the first ground pin passes through the circuit board It is electrically connected with the second ground pin, and the power pin transmits a power signal to the circuit board.

Preferably, the hollow chamber of the sensor is also filled with an encapsulation glue, the encapsulation glue will cure and encapsulate the piezoelectric sheet and the other end of the pin protruding into the hollow chamber of the sensor in the sensor, and the middle An encapsulation glue is poured into the hollow shell, and the encapsulation glue will be cured to encapsulate the circuit board and the isolation cover in the hollow shell.

In the present invention, a plurality of pins are arranged in the hollow shell of the shell, and the other ends of two pins are extended to the second opening of the hollow shell, and the grounding hole is set on the sensor, so that the sensor When it is fixed on the second opening of the hollow shell, the other end of one of the two pins can extend into the hollow chamber of the sensor, and easily connect with the piezoelectric sheet on the bottom wall of the sensor. connected, and the other end of the other pin of the two pins is inserted into the ground hole to be easily electrically connected to the housing of the sensor, which not only has a simple structure, is easy to assemble, and reduces material costs, it is also not easy to cause signal attenuation, and The wire welding operation is reduced, the manufacturing man-hours and the complexity of the manufacturing process are reduced, and the manufacturing cost is relatively reduced, and the efficacy and purpose of the present invention are indeed achieved.

Description of drawings

FIG. 1 is a plan sectional view of a conventional ultrasonic sensor device.

Fig. 2 is a plan sectional view of a conventional sensor.

Fig. 3 is an exploded perspective view of a preferred embodiment of the ultrasonic sensor device of the present invention.

Fig. 4 is a top view of the appearance of the ultrasonic sensor device of this embodiment.

FIG. 5 is a cross-sectional view along line I-I of FIG. 4 .

FIG. 6 is a sectional view taken along line II-II of FIG. 4 .

FIG. 7 is a cross-sectional view along line III-III in FIG. 4 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:

Referring to Fig. 3 to shown in Fig. 5, a preferred embodiment of the ultrasonic sensor device of the present invention comprises a housing 4, a sensor (transducer) 5, an annular seat 6, an O-ring 7, a circuit board 8 and an isolation cover 9.

The shell 4 includes a hollow shell 41, a connecting pipe portion 42 and five connecting pins 43-47. The hollow shell 41 is formed by an annular surrounding wall 48 and has a first opening which is opposite and communicated with each other. 411 and a second opening 412 . One end of the connecting pipe portion 42 is connected to the surrounding wall 48 of the hollow shell 41, and the other end has a third opening 421, and in this embodiment, the connecting pipe portion 42 and the hollow shell 41 are integrally formed, but Not limited to this. These pins 43-47 are fixed in the hollow housing 41, one end of which faces the first opening 411, and the other ends 431, 441 of two of the pins 43, 44 face the second opening 412, and the other three pins are connected to the second opening 412. The other ends of the pins 45 - 47 (only the other end 461 of the pin 46 is shown in FIG. 5 ) extend into the connecting pipe portion 42 and face the third opening 421 .

The sensor 5 includes a hollow chamber 53 surrounded by a surrounding wall 51 and a bottom wall 52 , a piezoelectric film 54 disposed on the bottom wall 52 , and a ground hole 55 disposed on the surrounding wall 51 . In this embodiment, the surrounding wall 51 and the bottom wall 52 are integrally formed and usually made of aluminum metal, but not limited thereto, and the sensor 5 has a top surface 56 opposite to the bottom wall 52, and the hollow chamber The openings of the ground hole 53 and the ground wire hole 55 both face the top surface 56 . The sensor 5 is fixed on the second opening 412 of the hollow housing 41 with the top surface 56 facing the hollow housing 41, so that the hollow chamber 53 and the ground wire hole 55 face in the hollow housing 41 so as to extend to the second opening 412 of the hollow housing 41. The other end 431 of the pin 43 of the opening 412 extends into the hollow chamber 53 of the sensor 5 and is electrically connected with the piezoelectric sheet 52 (for example, by wire bonding or direct contact, the present embodiment is an example of wire bonding), And make the other end 441 of the other pin 44 extending to the second opening 412 be inserted into the ground wire hole 55 and closely fit with the ground wire hole 55 to be electrically connected. Then, the hollow chamber 53 of the sensor 5 is usually filled with encapsulant (not shown in the figure), so that the piezoelectric film 52 and the other end 431 of the pin 43 are encapsulated in the sensor 5 after the encapsulant is cured.

More precisely, the sensor 5 is fixed on the hollow housing 41 by means of the annular seat 6 . As shown in Fig. 5 and Fig. 6, the inner wall surface of the hollow shell 41 close to the second opening 411 also extends a first flange 413 laterally inwardly, and the annular seat 6 is made of plastic material and has certain elasticity, and the annular The top surface 61 of the seat 6 retracts and forms a hook portion 62 upwards, and the inner wall surface 63 of the annular seat 6 is also recessed to form a locking groove 64, and the periphery of the top surface 56 of the sensor 5 also extends laterally outwards with a second protrusion. edge 57, the sensor 5 faces the annular seat 6 with the top surface 56 and is fixed on the annular seat 6 by inserting the second flange 57 into the slot 64 of the annular seat 6, and the annular seat 6 is then locked by the hook part 62 The sensor 5 is fixed on the second opening 412 of the hollow housing 41 on the first flange 413 of the hollow housing 41 , and the bottom wall 52 of the sensor 5 and the rear end of the surrounding wall 51 are exposed.

Therefore, further, in this embodiment, an O-ring 7 is sleeved on the rear end portion of the surrounding wall 51 of the sensor 5 , so as to cover the surrounding wall of the rear end portion of the sensor 5 and expose the bottom wall 52 of the sensor 5 .

The circuit board 8 is disposed on the first opening 411 of the hollow casing 41 to be electrically connected to one end of the pins 43 - 47 . More precisely, the circuit board 8 of this embodiment is provided with five through holes 81-85, and in order to prevent the circuit board 8 from leaking electromagnetic waves or being interfered by external electromagnetic waves, the circuit board 8 is also covered with a metal isolation layer. Cover 9, and as shown in FIG. 4, the isolation cover 9 covers the main circuit part of the circuit board 8 and exposes the through holes 81-85. Then, when the circuit board 8 is inserted into the first opening 411 of the hollow casing 41, one end of the pins 43-47 will pass through the corresponding through holes 81-85 and be soldered or connected to the through holes 81-85. 85 is tightly fitted to be electrically connected to the circuit board 8 . Finally, the hollow casing 41 is usually filled with encapsulation glue (not shown in the figure), and after the encapsulation glue is cured, the circuit board 8 and the isolation cover 9 are encapsulated in the hollow casing 41, that is, the assembly of the ultrasonic sensor device is completed. Operation.

Furthermore, in this embodiment, the pin 43 extending the other end 431 into the hollow chamber 53 of the sensor 5 is a first signal pin, and the other end 441 is inserted into the ground hole 55 of the sensor 5. The pin 44 is a first ground wire pin, and the other three pins 45-47 extending into the connecting pipe part 42 are respectively a second signal pin, a second ground wire pin and a power supply pin. pin, the first signal pin 43 is used to output a sensing signal generated by the piezoelectric sheet 54 to the circuit board 8, so that the circuit board 8 can properly process the sensing signal, and output it to the second signal pin 45, the first The ground pin 44 is electrically connected to the second ground pin 46 through the circuit board 8 , and the power pin 47 is used to transmit power signals to the circuit board 8 . Therefore, when the ultrasonic sensor of this embodiment is plugged into a connector with the connecting tube portion 42, such as a car connector installed on a car, the car can supply power to the circuit board 8 through the power supply pin 47, so that the circuit board 8. The sensing signal can be output to the car through the second signal pin for further judgment or use by the car, and the second ground pin is electrically connected to the car for grounding.

In addition, it is worth mentioning that the annular seat 6 is not an essential element, that is, when the sensor 5 itself can be fixed on the housing 4 by other methods or structures, the annular seat 6 can be omitted, and the O-ring 7 is not required. Necessary elements, such as the sensor 5 have been entirely placed in the second opening 412 of the casing 4, or it is unnecessary to consider whether the rear end of the surrounding wall 51 of the sensor 5 is exposed. Moreover, if it is not necessary to consider the problem of electromagnetic wave interference, the isolation cover 9 can also be omitted.

To sum up, in this embodiment, the pins 43-47 are provided in the hollow shell 41 of the casing 4, so that the other ends 431, 441 of the pins 43, 44 extend to the second end of the hollow shell 41. Two openings 412, and a grounding hole 55 is formed through the top surface 56 of the sensor 5, so that when the sensor 5 is fixed on the second opening 412 of the hollow housing 41 with the top surface 56, the pins 43 The other end of the pin 44 can be inserted into the hollow chamber 53 of the sensor 5, and can be easily electrically connected with the piezoelectric sheet 54 provided on the bottom wall 52 of the sensor 5, and the other end 441 of the pin 44 can be inserted into the ground. The hole 55 can easily be electrically connected with the housing of the sensor 5. Compared with the conventional sensor device using an adapter circuit board, it not only has a relatively simple structure, is easy to assemble, and reduces material costs, it is also not easy to cause signal attenuation, and reduces the number of wires. Welding operations, thereby reducing manufacturing man-hours and process complexity, and relatively reducing manufacturing costs, indeed achieve the efficacy and purpose of the present invention.

Claims (7)

1. An ultrasonic sensor device, characterized in that: The ultrasonic sensor device includes: A shell, including a hollow shell, a connecting pipe portion and five pins, the hollow shell has a first opening and a second opening opposite and communicated with each other, one end of the connecting pipe portion is connected to the The hollow shells are connected, and the other end has a third opening. The pins are fixed in the hollow shell, with one end facing the first opening, and the other ends of the two pins facing the first opening. the second opening, the other ends of the other three pins extend into the connecting pipe part and face the third opening; A sensor, comprising a hollow chamber formed by a surrounding wall and a bottom wall, a piezoelectric sheet arranged on the bottom wall, and a ground wire hole arranged on the surrounding wall, the sensor fixed on the second opening of the hollow shell, and make the hollow chamber and the ground wire hole face into the hollow shell, so that the other end of one of the pins extending to the second opening extends into the The hollow chamber of the sensor is electrically connected to the piezoelectric sheet, and the other end of the other pin extending to the second opening is inserted into the ground hole; and A circuit board is arranged on the first opening of the hollow casing and is electrically connected with one end of the pins. 2. The ultrasonic sensor device according to claim 1, characterized in that: the ultrasonic sensor device also includes an annular seat, the sensor is fixed on the annular seat, and the annular seat is clamped on the The first opening of the hollow housing fixes the sensor on the housing. 3. The ultrasonic sensor device according to claim 1, characterized in that: the rear end portion of the sensor surrounding the wall is exposed outside the housing, and the ultrasonic sensor also includes an O-ring, which is sleeved at the rear end portion of the surrounding wall of the sensor to cover the rear end portion of the surrounding wall. 4. The ultrasonic sensor device according to claim 1, wherein the ultrasonic sensor device further comprises an isolation cover covering the circuit board. 5. The ultrasonic sensor device according to claim 1, wherein the pin whose other end extends to the hollow chamber of the sensor is a first signal pin, and the other end is inserted into the ground wire of the sensor The pin of the hole is a first ground pin, and the three pins extending from the other end to the connecting tube are respectively a second signal pin, a second ground pin and a power supply pin. There are five through holes on the circuit board for one end of these pins to be pierced and electrically connected, and the first signal pin outputs a sensing signal to the circuit board, which is processed by the circuit board Then output to the second signal pin, the first ground pin is electrically connected to the second ground pin through the circuit board, and the power pin transmits a power signal to the circuit plate. 6. The ultrasonic sensor device according to claim 1, characterized in that: an encapsulant is also provided in the hollow chamber of the sensor, and the encapsulant will solidify to seal the piezoelectric sheet and the part of the sensor The other end of the pin in the hollow chamber is packaged in the sensor. 7. The ultrasonic sensor device according to claim 4, characterized in that: an encapsulant is also provided in the hollow housing, and the encapsulant will cure to encapsulate the circuit board and the isolation cover in the inside the hollow shell.

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