TW201415057A - Embedded ultrasonic transducer device and assembling method thereof - Google Patents

Abstract

An embedded ultrasonic transducer device comprising a housing, a transducer, a fixing ring, a circuit board, and a sealing cover. The housing comprises a hollow casing and at least one external pin, and the hollow casing has a first opening and an opposite second opening. The transducer comprises a hollow base and a piezoelectric piece and a damping member stacked in the base, and the base is disposed in the hollow casing and seals the second opening. The fixing ring is disposed corresponding to the transducer and fitted to the hollow casing to fix the transducer. The fixing ring comprises a ring body and at least one internal pin. The ring body has at least one rib extending toward the first opening, and the internal pin is electrically connected with the piezoelectric piece of the transducer. The circuit board, the external pin and the internal pin are electrically connected. The sealing cover closes the first opening and has an inner wall surface abutted against the rib of the fixing ring.

Description

Chimeric ultrasonic sensor device and assembly method thereof

The present invention relates to an ultrasonic sensing device, and more particularly to an ultrasonic sensing device for a vehicle ranging radar.

At present, various types of vehicles are usually equipped with ranging radars (such as anti-collision radars or reversing radars) that detect obstacles or come in to assist the driver in paying attention to environmental changes around the vehicle. Among them, ultrasonic radar is one of the common vehicle radars.

Referring to Figures 1 and 2, a conventional ultrasonic sensor device 9 for a vehicle is used. The ultrasonic sensor device 9 includes a housing 91, a sensor 92, a fixing ring 93 and a circuit board 94.

The housing 91 includes a housing 911 and a plurality of external pins 912 electrically connected to the sensor 92 and the circuit board 94. The inner wall surface of the housing 911 defines a plurality of limiting slots 913 for assembling and positioning the fixing ring 93.

The sensor 92 is mounted in the housing 911 corresponding to its opening 914 and partially protrudes from the opening 914 and closes the opening 914. The sensor 92 includes a body 921 and a piezoelectric piece 921 disposed in the base 921 and a foam 923. The piezoelectric piece 921 is used to generate and receive ultrasonic waves used for ranging, and the foam 923 is used for absorbing environmental shock to ensure The piezoelectric piece 921 operates stably.

The fixing ring 93 is mounted in the housing 911 and cooperates with the housing 911 to fix the position of the sensor 92 in the housing 911 and is electrically connected to the circuit board 94. Specifically, the fixing ring 93 includes a ring body 931, a plurality of inner pins 932 electrically connected to the circuit board 94, and a corresponding one disposed on the ring body 931. A damping ring 933 at the position of the sensor 92. A limiting protrusion 934 is formed on the outer edge of the ring body 931 corresponding to the limiting slot 913 of the housing 911 to provide a guiding and positioning function when the fixing ring 93 is mounted on the housing 911. The damper ring 933 is pressed against the sensor 92 to create a limit effect on the sensor 92.

The circuit board includes a plurality of through holes 941 for the external pins 912 and the inner pins 932 to pass through and form an electrical connection.

When the fixing ring 93 is assembled, the adhesive bumps 934 and the limiting slot 913 are coated with an adhesive (not shown) adjacent to the bottom end of the opening 914 to fix the fixing ring 93 to the fixing ring 93. Inside. However, during the subsequent assembly process, the retaining ring 93 may be peeled off by the applied adhesive, which affects the production yield.

Further, after the sensor 92, the fixing ring 93, and the circuit board 94 are mounted on the casing 911, a filling and curing process is further performed in the casing 911 to fix and package the member in the casing 911. However, the filling and curing process takes a lot of time (more than 24 hours), which affects production efficiency.

Moreover, after filling the encapsulant (not shown) in the housing 911, the encapsulant will chemically react with the circuit board 94, affecting its normal operation, and reducing the durability of the ultrasonic sensor device 9.

Accordingly, it is an object of the present invention to provide a chimeric ultrasonic sensor apparatus capable of solving the problem of fixing the peeling of a fixed ring without performing an encapsulating colloid filling step and a curing step, that is, an assembly procedure can be completed.

Thus, the chimeric ultrasonic sensor device of the present invention comprises a housing , a sensor, a fixing ring, a circuit board and a sealing cover.

The outer casing includes a hollow casing and at least one outer leg disposed in the hollow casing, the hollow casing having a first opening and a second opening corresponding to the position.

The sensor comprises a hollow seat body and a piezoelectric piece and a shock absorbing member stacked in the seat body. The seat body is disposed in the hollow housing corresponding to the second opening and closes the second opening.

The fixing ring is disposed in the hollow housing corresponding to the sensor, and cooperates with the hollow housing to fix the sensor. The fixing ring includes a ring body and at least one inner leg disposed on the ring body, the ring body having at least one rib protruding toward the first opening of the hollow casing, the inner leg and the pressure of the sensor The electrical sheets form an electrical connection.

The circuit board is disposed in the hollow housing and electrically connected to the external pin and the inner leg.

The sealing cover is mounted on the hollow casing and closes the first opening, and an inner wall surface thereof is pressed against the rib of the fixing ring.

Preferably, the inner wall surface of the hollow casing is recessed to form at least one limiting sliding slot, and the outer edge of the ring body forms at least one limiting convex corresponding to the limiting sliding slot and received in the limiting sliding slot. And a rib of the ring body is disposed at the corresponding limiting protrusion and received in the limiting sliding slot.

More preferably, the limit chutes, the limit protrusions and the number of the ribs are two, and the limit chutes are formed on the inner wall surface of the hollow casing and opposite to each other, The equipotential protrusions and the ribs are respectively disposed on opposite sides of the ring body, and are respectively accommodated in the corresponding limit chutes.

Further, the number of the limit chutes and the limit bumps is three, and the number of the ribs is two; the second of the limit chutes is formed in the hollow shell The inner wall surfaces are opposite to each other, and two of the limiting protrusions and the rib columns are respectively disposed on opposite sides of the ring body, and the limiting protrusions and the rib columns are respectively accommodated Corresponding in the limit chute.

Preferably, the outer casing further includes a first damper ring, the first damper ring is made of a resilient material, and is disposed at the second opening of the hollow casing, and the base of the sensor The second opening is closed in contact.

Preferably, the fixing ring further comprises a second damper ring disposed at the sensor corresponding to the ring body, the second damper ring is made of a resilient material and is in contact with the seat of the sensor.

Preferably, the sealing cover is welded to the hollow casing by ultrasonic welding technology or laser welding technology.

Another object of the present invention is to provide a method of assembling the above-described chimeric ultrasonic sensor device.

Therefore, the assembling method of the chimeric ultrasonic sensor device of the present invention comprises the following steps: (A) preparing a housing having a corresponding first opening and a second opening and including at least one external pin, and a piezoelectric piece and a shock absorbing member is sequentially disposed in the body to prepare a sensor; (B) the sensor is mounted on the outer casing, and the second opening of the outer casing is closed by the sensor; (C) one having at least one rib column And a fixing ring of the at least one inner pin is mounted in the outer casing and pressed against the sensor, and electrically connects the inner leg of the fixing ring to the sensor, and the first opening of the rib is toward the outer casing (D) mounting a circuit board in the housing, and electrically connecting the circuit board to the outer leg of the outer casing and the inner leg of the fixing ring; and (E) mounting a sealing cover a rib disposed on the outer casing and pressed against the fixing ring, and the first opening of the outer casing is closed by the sealing cover.

Preferably, in step (B), the sensor is mounted in the outer casing via a first opening of the outer casing and partially protrudes outside the second opening.

Preferably, the inner wall surface of the hollow casing of the outer casing forms at least one limiting chute extending between the first opening and the second opening, and the ring system of the fixing ring forms at least one corresponding limit a limiting protrusion of the sliding groove, wherein the rib column is disposed at a corresponding limiting protrusion; and the fixing ring is installed in the outer casing through the first opening of the outer casing in the step (C), and the limit is The bump and the rib are slid into the limit chute from the first opening toward the second opening.

Preferably, in step (E), the sealing cover is welded to the outer casing by ultrasonic welding technology or laser welding technology.

The effect of the invention is that after the sensor, the fixing ring, the circuit board and the sealing cover are mounted on the outer casing of the fitting ultrasonic sensor device, the second damping ring of the fixing ring adjacent to the second opening is in contact with the sensor to limit the position thereof. As a result, the rib protruding from the fixing ring toward the first opening is pressed by the inner wall surface of the sealing cover to fix the fixing ring. Therefore, the chimeric ultrasonic sensor device of the present invention can complete the assembly process without using the adhesive and the encapsulant, and can avoid the peeling problem of the fixing ring, thereby effectively improving the process efficiency and the process yield.

The foregoing and other technical aspects, features and advantages of the present invention will be apparent from the following description of the preferred embodiments.

Referring to Figures 3, 4 and 5, a preferred embodiment of the chiseled ultrasonic sensor device 1 of the present invention is shown. The chimeric ultrasonic sensor device 1 can be applied to a reversing radar or an anti-collision radar of a vehicle to improve driving safety, but the application field is not limited to the above.

Specifically, the chimeric ultrasonic sensor device 1 includes a casing 2, a sensor 3 mounted on the casing 2, a fixing ring 4, a circuit board 5, and a sealing cover 6.

Referring to FIG. 3, FIG. 5, FIG. 7, and FIG. 8, the outer casing 2 includes a hollow casing 21, a first damper ring 22, a first outer leg 23, a second outer leg 24, and a third outer leg. 25.

The hollow casing 21 has a substantially cylindrical shape, and its outer edge forms a connecting pipe portion 211 that communicates with the hollow casing 21. The hollow housing 21 has a corresponding first opening 213 and a second opening 214, and is recessed on the inner wall surface to form three extending between the first opening 213 and the second opening 214 for fixing the ring 4. The set position stop chute 212 is mounted, and four positioning plates 216 protruding toward the first opening 213 for mounting the circuit board 5 are formed. However, the number of the limiting slot 212 and the positioning plate 216 can be flexibly adjusted as needed, and is not limited thereto.

The first damper ring 22 is made of a material having elasticity (such as rubber), is disposed adjacent to the second opening 214 of the hollow casing 21, and is in contact with the sensor 3 partially protruding from the second opening 214, and Closing the second opening 214 .

The first outer leg 23, the second outer leg 24 and the third outer leg 25 are disposed in the hollow housing 21, and the three ends that protrude toward the first opening 213 are electrically connected to the circuit board 5, respectively, and are oriented toward the third The other end of the opening 215 is electrically connected to an external control circuit (not shown). The first external pin 23 provides a grounding function, the second external pin 24 transmits the signal generated by the sensor 3 to the external control circuit through the circuit board 5, and the third external pin 25 provides the power required by the circuit board 5 through an external control circuit. .

In this embodiment, the first outer leg 23 and the second outer leg 24 are disposed adjacent to the third outer leg 25 on one side of the hollow housing 21 and are equally spaced from the three limiting slots 212. Inside the hollow casing 21. However, the positions of the external legs 23, 24, 25 and the limit chute 212 can be adjusted as needed, and are not limited to the contents disclosed herein.

Referring to FIG. 3, FIG. 5, FIG. 9 and FIG. 10, the sensor 3 can generate a sensing signal for ranging according to the ultrasonic wave reflected by the adjacent object, and is disposed in the hollow housing 21 corresponding to the second opening 214. And being fastened in the first damper ring 22 and partially protruding outside the hollow casing 21 to close the second opening 214.

Specifically, the sensor 3 includes a hollow metal base 31 and a piezoelectric piece 32 and a shock absorbing member 33 which are sequentially stacked in the base 31. Here, the piezoelectric sheet 32 is made of a piezoelectric material and is disposed on the inner bottom surface of the base body 31, and is controlled to generate oscillation to emit ultrasonic waves, and receives the reflected ultrasonic waves to generate a sensing signal. The shock absorbing member 33 is made of foam and is disposed on the piezoelectric sheet 32 for absorbing shock generated by the external environment to prevent the piezoelectric sheet 32 from being disturbed.

Referring to FIG. 3, FIG. 5, FIG. 11 and FIG. 12, the fixing ring 4 is disposed in the corresponding sensor 3 in the hollow casing 21, and includes a ring body 41, a second damping ring 42, and a first inner leg 43. A second inner pin 44.

The ring body 41 protrudes outwardly from the position of the three limiting slots 212 of the hollow housing 21 to form a limiting protrusion 411 for assembling and positioning, and adjacent to the first inner leg 43 and the second At the two opposite limiting protrusions 411 of the inner leg 44, a rib 412 is formed to extend toward the first opening 213 of the hollow housing 21, respectively. The ribs 412 respectively abut against the sealing cover 6 that closes the first opening 213, and the fixing ring 4 is stuck and limited.

The second damper ring 42 is disposed at a position corresponding to the sensor 3 of the ring body 41, is made of a material having elasticity, and is fixed to the seat body 31 of the sensor 3 after the fixing ring 4 is assembled to the hollow casing 21, and the first reduction The ring 22 is coupled to the hollow housing 21 to provide a fixed effect on the sensor 3.

The first inner leg 43 and the second inner leg 44 are disposed on the ring body 41 and both ends of the two protrude outward. The first inner leg 43 has one end connected to the metal base 31 of the sensor 3 and the other end electrically connected to the circuit board 5 for providing a grounding effect. On the other hand, one end of the second inner leg 44 is electrically connected to the piezoelectric piece 32 of the sensor 3, and the other end thereof is electrically connected to the circuit board 5, and the sensing signal generated by the piezoelectric piece 32 is transmitted to the circuit board 5.

3, 5, 13, and 14, the circuit board 5 is disposed on the four positioning plates 216 in the hollow casing 21, and is electrically connected to the inner legs 43, 44 and the external pins 23, 24, 25. The connection is made to provide a medium for the sensor 3 to be electrically connected to an external control circuit (not shown).

Referring to FIGS. 3, 4 and 5, the sealing cover 6 is mounted on the hollow casing 21 The first opening 213 is closed, and the inner wall surface thereof is pressed against the rib 412 of the fixing ring 4 to generate a limiting effect on the fixing ring 4 and the sensor 3.

The above description is an embodiment in which the sensor 3, the fixing ring 4, the circuit board 5, and the sealing cover 6 are mounted on the casing 2, and the fitting ultrasonic sensor device 1 can perform the function of the device.

The assembly flow of the fitting ultrasonic sensor device 1 will be described below with reference to Fig. 6 and related drawings.

Step S1: A casing 2 is prepared and a sensor 3 is assembled.

Step S2: The sensor 3 is mounted in the casing 2.

Refer to Figures 7 to 10. Step S1 is a pre-preparation step of firstly forming various members of the outer casing 2 (the hollow casing 21, the first damper ring 22 and the outer legs 23, 24, 25) and the various members of the sensor 3 (the seat body 31, the pressure) The electric piece 32 is assembled with the shock absorbing member 33), and then the sensor 3 is installed in the hollow casing 21 from the first opening 213 in step S2.

Step S3: The fixing ring 4 is mounted in the outer casing 2, thereby fixing the sensor 3.

Referring to FIG. 3, FIG. 11 and FIG. 12, the fixing ring 4 is installed in the hollow casing 21 from the first opening 213, and electrically connects the first inner leg 43 and the second inner leg 44 to the sensor. 3. The three limiting protrusions 411 and the two ribs 412 of the fixing ring 4 are respectively aligned with the three limiting sliding slots 212 of the hollow housing 21, and are slid into the fixed ring 4 from the top. The second damper ring 42 contacts the sensor 3 and the first damper ring 22, and initially positions the sensor 3.

Step S4: mounting the circuit board 5 in the outer casing 2, and the external pins 23 24, 25 and the inner legs 43, 44 form an electrical connection.

Referring to FIG. 3, FIG. 13, and FIG. 14, the circuit board 5 is mounted on the hollow housing 21 by the first opening 213, and is disposed on the positioning board 216, and further connected to the external pins 23, 24, 25 is connected to the inner pins 43, 44 to form an electrical connection.

Step S5: The second opening 214 of the outer casing 2 is closed by the sealing cover 6, and a positioning effect is generated on the fixing ring 4 and the sensor 3.

Referring to FIG. 3 to FIG. 5, the sealing cover 6 is welded to the hollow casing 21 by an ultrasonic welding technique or a laser welding technique, and the first opening 213 is closed. Here, the inner wall surface of the sealing cover 6 is pressed against the rib 412 of the fixing ring 4, and the limiting effect of the fixing ring 4 and the sensor 3 can be further produced.

In summary, the chisel type ultrasonic sensor device 1 is configured such that the sensor 3, the fixing ring 4, the circuit board 5 and the sealing cover 6 are mounted on the outer casing 2 without the need of adhesive or encapsulant. The internal member produces a fixing positioning effect, and the conventional ultrasonic sensor device 9 of Figs. 1 and 2 effectively improves the production efficiency and the production yield, and thus the object of the present invention can be attained.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

1‧‧‧Chimeric ultrasonic sensor device

2‧‧‧ Shell

21‧‧‧ hollow housing

211‧‧‧Connected pipe department

212‧‧‧Limit chute

213‧‧‧ first opening

214‧‧‧ second opening

215‧‧‧ third opening

216‧‧‧ positioning board

22‧‧‧First damping ring

23‧‧‧First external pin

24‧‧‧Second external feet

25‧‧‧ Third external leg

3‧‧‧ Sensor

31‧‧‧

32‧‧‧ Piezo Pieces

33‧‧‧ Shock absorbers

4‧‧‧Fixed ring

41‧‧‧ Ring Ontology

411‧‧‧ Limit bumps

412‧‧‧ ribs

42‧‧‧Second damping ring

43‧‧‧First internal pin

44‧‧‧Second internal pin

5‧‧‧Circuit board

6‧‧‧ Sealing cover

S1~S5‧‧‧ Process steps

Figure 1 is an exploded perspective view showing a conventional ultrasonic sensor for vehicles Figure 2 is a side cross-sectional view of the conventional ultrasonic sensor device; Figure 3 is an exploded perspective view showing a preferred embodiment of the chimeric ultrasonic sensor device of the present invention; and Figure 4 is a perspective combination of the embedded ultrasonic sensor device Figure 5 is a side cross-sectional view of the fitting ultrasonic sensor device; Figure 6 is a flow chart illustrating the assembly steps of the fitting ultrasonic sensor device; Figure 7 is a top view showing the outer casing of the fitting ultrasonic sensor device Figure 8 is a side cross-sectional view of the outer casing; Figure 9 is a top view showing a sensor mounted on the outer casing; Figure 10 is a side cross-sectional view of Figure 9; and Figure 11 is a top view illustrating FIG. 12 is a side cross-sectional view of FIG. 11; FIG. 13 is a top view showing a fitting ultrasonic sensor with a circuit board mounted in FIG. An embodiment of the device semi-finished product; and FIG. 14 is a side cross-sectional view of FIG.

1‧‧‧Chimeric ultrasonic sensor device

2‧‧‧ Shell

21‧‧‧ hollow housing

211‧‧‧Connected pipe department

212‧‧‧Limit chute

213‧‧‧ first opening

214‧‧‧ second opening

215‧‧‧ third opening

22‧‧‧First damping ring

23‧‧‧First external pin

24‧‧‧Second external feet

25‧‧‧ Third external leg

3‧‧‧ Sensor

31‧‧‧

32‧‧‧ Piezo Pieces

33‧‧‧ Shock absorbers

4‧‧‧Fixed ring

41‧‧‧ Ring Ontology

411‧‧‧ Limit bumps

412‧‧‧ ribs

42‧‧‧Second damping ring

43‧‧‧First internal pin

44‧‧‧Second internal pin

5‧‧‧Circuit board

6‧‧‧ Sealing cover

Claims (11)

A fitting ultrasonic sensor device comprising: a housing comprising a hollow housing and at least one external leg disposed in the hollow housing, the hollow housing having a first opening and a second corresponding position a sensor, comprising a hollow body and a piezoelectric piece and a shock absorbing member stacked in the body, the seat body is disposed in the hollow casing corresponding to the second opening and closing the second opening a fixing ring disposed in the hollow housing corresponding to the sensor and cooperating with the hollow housing to fix the sensor, the fixing ring comprising a ring body and at least one inner pin disposed on the ring body The ring body has at least one rib protruding toward the first opening of the hollow casing, the inner leg being electrically connected to the piezoelectric piece of the sensor; a circuit board disposed in the hollow casing And forming an electrical connection with the external leg and the inner leg; and a sealing cover mounted on the hollow casing and closing the first opening, and the inner wall surface of the sealing cover is pressed against the fixing ring Ribs. The fitting ultrasonic sensor device according to claim 1, wherein the inner wall surface of the hollow casing is recessed to form at least one limiting chute, and the outer edge of the ring body forms at least one corresponding limit chute. And a limiting protrusion disposed in the limiting slot, and the rib of the ring body is disposed at the corresponding limiting protrusion and received in the limiting sliding slot. The chisel type ultrasonic sensor device according to claim 2, wherein the limit chute, the limit bump and the number of the ribs are two The limiting chutes are formed on the inner wall surface of the hollow casing and opposite to each other, and the limiting lugs and the ribbed columns are respectively disposed on opposite sides of the ring body, and are respectively accommodated in Corresponding in the limit chute. The chisel type ultrasonic sensor device of claim 2, wherein the number of the limit chutes and the limit bumps is three, and the number of the ribs is two; the limit chutes Two of the limiting protrusions are formed on the inner wall surface of the hollow housing and opposite to each other, and two of the limiting protrusions and the rib pillars are respectively disposed on opposite sides of the ring body, and the limiting protrusions are respectively The block and the ribs are respectively accommodated in the corresponding limit chutes. The chisel type ultrasonic sensor device according to claim 1, wherein the outer casing further comprises a first damper ring, the first damper ring is made of a resilient material, and is disposed on the hollow shell The second opening of the body is closed in contact with the seat of the sensor. The chisel type ultrasonic sensor device of claim 1, wherein the fixing ring further comprises a second damper ring disposed at the sensor corresponding to the ring body, the second damper ring being elastic Made of material and against the body of the sensor. The fitting ultrasonic sensor device according to claim 1, wherein the sealing cover is welded to the hollow casing by an ultrasonic welding technique or a laser welding technique. A method for assembling a chimeric ultrasonic sensor device comprises the steps of: (A) preparing a housing having a corresponding first opening and a second opening and including at least one external pin, and a piezoelectric piece and a shock absorbing Piece a sensor is disposed in the body to prepare a sensor; (B) the sensor is mounted on the outer casing, and the second opening of the outer casing is closed by the sensor; (C) having at least one rib column and at least one inner portion a fixing ring of the pin is mounted in the outer casing and is pressed against the sensor, and electrically connects the inner leg of the fixing ring to the sensor, and protrudes the rib toward the first opening of the outer casing; a circuit board is mounted in the outer casing, and the circuit board is electrically connected to the outer leg of the outer casing and the inner leg of the fixing ring; and (E) a sealing cover is mounted on the outer casing and Pressing the rib of the retaining ring and closing the first opening of the outer casing by the sealing cover. The assembly method according to claim 8, wherein in the step (B), the sensor is installed in the outer casing via the first opening of the outer casing and partially protrudes outside the second opening. The assembly method of claim 8, wherein the inner wall surface of the hollow casing of the outer casing forms at least one limit chute extending between the first opening and the second opening, the fixing The ring-shaped ring system forms at least one limiting protrusion corresponding to the limiting chute, and the rib column is disposed at the corresponding limiting protrusion; in the step (C), the fixing ring is first through the outer casing The opening is installed in the outer casing, and the limiting protrusion and the rib are slid into the limiting sliding slot from the first opening toward the second opening. The assembly method according to claim 8, wherein in the step (E), the sealing cover is welded to the outer casing by an ultrasonic welding technique or a laser welding technique.