TWM448862U - Stacked type ultrasonic transducer apparatus - Google Patents

Description

Stacked ultrasonic sensor device

The present invention relates to a sensor device, and more particularly to a stacked ultrasonic sensor device for transmitting a sensing signal of a piezoelectric sheet.

Referring to FIG. 1, Taiwan Patent No. M433689 discloses a prior art related to an ultrasonic sensor device having a hollow housing 21, a circuit board 22, a connecting tube portion 23, and a hollow housing 21. Ultrasonic sensor 24. One end of the connecting pipe portion 23 is connected to the hollow casing 21. The circuit board 22 is provided with three pins 221 (only one of which is shown in cross section). One end of the pins 221 is fixed on the circuit board 22, and the other end extends into the connecting tube portion 23 and faces the connecting tube portion 23. An opening 231 at one end.

Referring to FIG. 2, the ultrasonic sensor 24 has an aluminum hollow casing 241, a piezoelectric piece 242 disposed on the inner bottom surface of the hollow casing 241, a transit circuit board 243 disposed above the piezoelectric piece 242, and Two wires 244, 245 are electrically connected to the circuit board 22. The transit circuit board 243 is electrically connected to the piezoelectric strip 242 through a first wire 246, and is electrically connected to the hollow casing 241 through a second wire 247, and then transmits the signal transmitted by the first wire 246 through the wire 244. The circuit board 22 is connected to the circuit board 22 via the wires 245 to output signals and ground via the two pins 221 of the circuit board 22.

However, when the second wire 247 is welded to the hollow casing 241, since the hollow casing 241 is made of aluminum, the joint is high and it is difficult to weld. In addition, the piezoelectric piece 242 needs to be electrically connected to the circuit board 22 through the transit circuit board 243, which is not only increased. Add material cost and installation steps, and easily cause signal attenuation, and in addition to the two ends of the first and second wires 246, 247 need to be separately soldered, the wires 244, 255 also need to be respectively connected to the transfer circuit board 243 and the circuit board 22 welding, thereby increasing the working hours and process complexity, and relatively increasing the manufacturing cost.

Therefore, the purpose of the present invention is to provide a stacked ultrasonic sensor device that is easy to assemble to reduce process complexity and thereby reduce manufacturing costs.

Therefore, the novel ultrasonic sensor device comprises a casing, a sensor, a fixing ring, and a circuit board.

The outer casing includes a hollow casing, a connecting pipe portion extending radially from an outer surface of the hollow casing, and three outer legs. The hollow housing has a first opening and a second opening in communication on an imaginary axis. The connecting tube portion has a third opening remote from the hollow housing. The outer legs are secured within the hollow housing. Each of the outer legs has a first end facing the first opening and a second end extending into the connecting tube portion and facing the third opening.

The sensor is disposed at a second opening of the hollow housing of the housing. The sensor includes a bottom wall, a surrounding wall extending from the peripheral edge of the bottom wall in the direction of the axis to be in contact with the hollow casing, and a pressure placed on the surface of the bottom wall facing the hollow casing Electric film. The surrounding wall has a ground hole extending in the direction of the axis and opening toward the hollow housing.

The fixing ring includes a sensor disposed in the hollow housing adjacent to the sensor The ring body and the inner leg of the ring body are disposed. The ring body cooperates with the outer casing to fix the sensor. Each inner leg has a first end that is closer to the first opening of the hollow housing and a second end that is closer to the second opening. A second end of one of the inner legs is inserted into the ground hole, and a second end of the other of the inner legs is electrically connected to the piezoelectric piece.

The circuit board is disposed adjacent to the first opening of the hollow housing and is electrically connected to the first end of the external legs and the first end of the inner legs.

Preferably, the hollow casing of the outer casing further has a first damper ring disposed at the second opening to reduce the diameter and elasticity of the second opening. The retaining ring further includes a second damper ring that is disposed on a side of the ring body adjacent to the sensor and has elasticity. The surrounding wall of the sensor has a limiting flange extending radially outward from one side of the first opening and being clamped between the first damper ring and the second damper ring.

Preferably, the hollow housing further includes at least one limiting chute formed on the inner circumferential surface and extending in the axial direction. The fixing ring further includes at least one outer peripheral surface of the ring disposed on the fixing ring and slidably disposed on the limiting sliding slot to limit the limiting protrusion of the fixing ring displaced along the axial direction.

Preferably, among the inner pins of the fixing ring, the inner leg of the second end portion inserted into the ground hole of the sensor is a first ground pin, and the other end is electrically connected to the piezoelectric plate. The connected internal pin is a first signal pin. The external pins defining the hollow housing are a second signal pin, a second ground pin and a power pin, respectively. The board has five perforations for each The first end of the inner leg is threaded and electrically connected to the first end of each outer leg. The first signal pin of the fixing ring outputs a sensing signal from the piezoelectric piece to the circuit board, and is processed by the circuit board and output to the second signal pin of the hollow casing. The first ground pin is electrically connected to the second ground pin through the circuit board. The power pin supplies power to the board.

Preferably, the bottom wall of the sensor cooperates with the surrounding wall to define a hollow chamber. The hollow chamber is filled with an encapsulant, and the encapsulant is cured to encapsulate the piezoelectric sheet in the sensor.

Preferably, the sensor further comprises a foam for pressing the piezoelectric sheet and for absorbing the shock.

More preferably, the bottom wall of the sensor cooperates with the surrounding wall to define a hollow chamber, which is filled with an encapsulant, and the encapsulant is cured to encapsulate the piezoelectric sheet and the foam in the sensor.

Preferably, the encapsulating glue is further filled in the hollow casing, and the encapsulant is cured to encapsulate the circuit board and the fixing ring in the hollow casing.

The utility model has the advantages that the fixing ring is fixed in the hollow casing of the outer casing, the assembly step of the novel ultrasonic sensor device is simplified, and the number of components is also reduced, thereby effectively improving the manufacturing speed and reducing the manufacturing cost. .

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

Referring to FIG. 3 and FIG. 5, the stacked ultrasonic sensor device of the present invention A preferred embodiment includes a housing 3, a sensor 4, a retaining ring 5, and a circuit board 6.

The outer casing 3 includes a hollow casing 31, a connecting pipe portion 32, and three outer legs 33, 34, 35. The hollow casing 31 has a first opening 311 and a second opening 312 connected to an imaginary axis 30, and a first shock absorbing ring 314 having elasticity. The first damper ring 314 is disposed at the second opening 312 to reduce the diameter of the second opening 312. The hollow casing 31 also has three limit chutes 313 formed on the inner peripheral surface and extending in the direction of the axis 30. The connecting pipe portion 32 extends radially from the outer surface of the hollow casing 31. The connecting pipe portion 32 has a third opening 321 away from the hollow casing 31. The outer legs 33, 34, 35 are fixed in the hollow casing 31. Each of the outer legs 33, 34, 35 has a first end portion 331, 341, 351 facing the first opening 311, and a second end portion 342 extending into the connecting tube portion 32 and facing the third opening 321 ( Only the second end 342) of the outer leg 34 is shown in FIG.

The sensor 4 is provided at the first damping ring 314 of the hollow casing 31 of the outer casing 3. The sensor 4 includes a bottom wall 41, a surrounding wall 42, a piezoelectric sheet 43, and a shock absorbing foam 45. The outer diameter of the bottom wall 41 conforms to the inner diameter of the first damper ring 314 of the hollow casing 31. The surrounding wall 42 extends from the periphery of the bottom wall 41 in the direction of the axis 30. The surrounding wall 42 has a stop flange 421 extending radially outward from one side of the first opening 311 of the hollow housing 31. The surrounding wall 42 also has a ground hole 44 extending in the direction of the axis 30 and opening toward the hollow casing 31. The bottom wall 41 cooperates with the surrounding wall 42 to define a hollow chamber 40. The piezoelectric sheet 43 is placed in the hollow chamber 40 and is in contact with the bottom wall 41 to face the surface of the hollow casing 31. The foam 45 is placed in the hollow chamber 40 and pressed against the piezoelectric sheet 43.

The fixing ring 5 includes a ring body 51, a second damper ring 52, two inner pins 53, 54 and three limiting bumps 55. The ring body 51 is disposed within the hollow housing 31 and adjacent to the sensor 4. The second damper ring 52 is disposed on a side of the ring body 51 close to the sensor 4, and the inner diameter of the second damper ring 52 is the same as the inner diameter of the first damper ring 314 of the hollow casing 31. The second damper ring 52 cooperates with the first damper ring 314 of the hollow housing 31 to clamp the limiting flange 421 of the sensor wall 4 around the wall 42 therein. The inner pins 53, 54 are disposed in the ring body 51. Each of the inner legs 53, 54 has a first end 531, 541 that is closer to the first opening 311 of the hollow housing 31, and a second end 532, 542 that is closer to the second opening 312. The second end portion 532 of one of the inner legs 53 is inserted into the ground hole 44 of the sensor 4 surrounding the wall 42 and is in contact with the ground hole 44, and the second end portion 542 of the other inner pin 54 is lined. The method is electrically connected to the piezoelectric piece 43 of the sensor 4, but it is not limited to the wire bonding method, and may be directly connected and electrically connected.

Referring to FIGS. 3 and 6 , the limiting protrusions 55 are disposed on the outer circumferential surface of the ring body 51 and are relatively slidable in the limiting sliding slots 313 of the hollow housing 31 . The engagement of the limiting projection 55 with the limiting slot 313 limits the movement of the retaining ring 5 only in the direction of the axis 30.

Referring to Figures 4 and 5, five perforations 61 are formed in the circuit board 6. The circuit board 6 is disposed adjacent to the first opening 311 of the hollow casing 31 of the outer casing 3. The first ends 331 , 341 , 351 of the external legs 33 , 34 , 35 and the first ends 531 , 541 of the internal pins 53 , 54 are respectively inserted in the through holes 61 and electrically connected to the circuit board 6 . connection.

In the preferred embodiment, the inner legs 53 of the retaining ring 5 are defined In FIG. 54, the second end portion 532 is inserted into the grounding hole 44 of the sensor 4 surrounding the wall 42, that is, the inner connecting pin 53 is a first grounding pin 53; the other inner connecting pin 54 is A first signal pin 54. The external pins 33, 34, 35 defining the hollow housing 31 are a second ground pin 33, a second signal pin 34, and a power pin 35, respectively. The sensing signal of the piezoelectric sheet 43 is transmitted to the circuit board 6 through the first signal pin 54 and processed by the circuit board 6 to be output to the second signal pin 34. The first ground pin 53 is electrically connected to the second ground pin 33 through the circuit board 6. The power pin 35 supplies power to the circuit board 6.

The assembling step of the stacked ultrasonic sensor device of the present invention firstly inserts the sensor 4 into the hollow casing 31 from the first opening 311 of the hollow casing 31 of the outer casing 3, and then follows the retaining ring 5 along the limiting chute 313. Slide into the hollow housing 31 to clamp the sensor 4. The second end portion 532 of the first grounding pin 53 of the fixing ring 5 is inserted into the grounding hole 44 of the sensor 4 surrounding the wall 42 and connected to the grounding hole 44, and then the first signal pin 54 of the fixing ring 5 is connected. The second end portion 542 is electrically connected to the piezoelectric piece 43 of the sensor 4, and finally the circuit board 6 is placed in the hollow casing 31, so that the external pins 33, 34, 35 of the outer casing 3 and the fixing ring 5 are The inner pins 53, 54 are respectively inserted into the through holes 61 of the circuit board 6 and electrically connected to the circuit board 6.

In the preferred embodiment, after the assembly is completed, a package adhesive (not shown) may be poured into the hollow chamber 40 of the sensor 4. After the package is cured, the piezoelectric sheet 43 and the foam 45 may be packaged. In the sensor 4. In addition, the encapsulant can be filled in the hollow casing 31 of the outer casing 3. When the encapsulant is cured, the circuit board 6 and the fixing ring 5 can be encapsulated in the hollow casing 31.

In summary, by the arrangement of the hollow shell and the retaining ring, and sensing The design of the external shape can fix the sensor in the construction of the hollow shell, and then the internal pins and the arrangement of the external pins can be used to make the circuit board installation without other wires, and the assembly steps are completed. The purpose of this novel is indeed achieved by streamlining and reducing the number of components.

However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention cannot be limited thereto, that is, the simple equivalent change and modification made by the novel patent application scope and the novel description content, All remain within the scope of this new patent.

[Pre-Technical Component Symbols]

21‧‧‧ hollow housing

22‧‧‧ Circuit board

221‧‧‧ feet

23‧‧‧Connected pipe department

231‧‧‧ openings

24‧‧‧ ultrasonic sensor

241‧‧‧ hollow housing

242‧‧‧ Piezo Pieces

243‧‧‧Transfer board

244‧‧‧ wire

245‧‧‧Wire

246‧‧‧First wire

247‧‧‧second wire

[Main components of this new model]

3‧‧‧ Shell

30‧‧‧ axis

31‧‧‧ hollow shell

311‧‧‧ first opening

312‧‧‧ second opening

313‧‧‧Limit chute

314‧‧‧First damping ring

32‧‧‧Connected pipe department

321‧‧‧ third opening

33‧‧‧External feet (second ground pin)

331‧‧‧ first end

332‧‧‧ second end

34‧‧‧External pin (second signal pin)

341‧‧‧ first end

342‧‧‧second end

35‧‧‧External pin (power pin)

351‧‧‧ first end

352‧‧‧ second end

4‧‧‧ sensor

40‧‧‧ hollow room

41‧‧‧ bottom wall

42‧‧‧ Around the wall

421‧‧‧Limited flange

43‧‧‧ Piezo Pieces

44‧‧‧ Ground hole

45‧‧•foam

5‧‧‧Fixed ring

51‧‧‧ Ring Ontology

52‧‧‧Second damping ring

53‧‧‧Internal pin (first ground pin)

531‧‧‧First end

532‧‧‧second end

54‧‧‧Internal pin (first signal pin)

541‧‧‧ first end

542‧‧‧second end

55‧‧‧ Limit bumps

6‧‧‧Circuit board

61‧‧‧Perforation

1 is a cross-sectional view showing a conventional ultrasonic sensor device; FIG. 2 is a cross-sectional view showing the conventional sensor; FIG. 3 is an exploded perspective view showing a preferred embodiment of the stacked ultrasonic sensor device of the present invention. Figure 4 is a plan view showing the preferred embodiment; Figure 5 is a cross-sectional view taken along line II of Figure 4, illustrating the relationship of the components of the preferred embodiment; and Figure 6 is a top view, not shown A circuit board in the preferred embodiment to show the relationship between the various components.

3‧‧‧ Shell

30‧‧‧ axis

31‧‧‧ hollow shell

311‧‧‧ first opening

313‧‧‧Limit chute

314‧‧‧First damping ring

32‧‧‧Connected pipe department

33‧‧‧External feet (second ground pin)

331‧‧‧ first end

34‧‧‧External pin (second signal pin)

341‧‧‧ first end

35‧‧‧External pin (power pin)

351‧‧‧ first end

4‧‧‧ sensor

40‧‧‧ hollow room

41‧‧‧ bottom wall

42‧‧‧ Around the wall

421‧‧‧Limited flange

43‧‧‧ Piezo Pieces

44‧‧‧ Ground hole

45‧‧•foam

5‧‧‧Fixed ring

51‧‧‧ Ring Ontology

52‧‧‧Second damping ring

53‧‧‧Internal pin (first ground pin)

531‧‧‧First end

532‧‧‧second end

54‧‧‧Internal pin (first signal pin)

541‧‧‧ first end

542‧‧‧second end

55‧‧‧ Limit bumps

6‧‧‧Circuit board

61‧‧‧Perforation

Claims (8)

A stacked ultrasonic sensor device comprising: a casing comprising a hollow casing, a connecting pipe portion extending radially from an outer surface of the hollow casing, and three external legs, the hollow casing having an imaginary a first opening and a second opening on the axis of the connecting tube, the connecting tube portion has a third opening away from the hollow housing, the external legs are fixed in the hollow housing, each external pin Having a first end facing the first opening and a second end extending into the connecting tube portion and facing the third opening; a sensor disposed at the second opening of the hollow casing of the outer casing The sensor includes a bottom wall, a surrounding wall extending from the peripheral edge of the bottom wall in the direction of the axis to be in contact with the hollow casing, and a surface disposed on the surface of the bottom wall facing the hollow casing a piezoelectric sheet, the surrounding wall has a ground hole extending in a direction of the axis and opening toward the hollow casing; a fixing ring comprising a ring body disposed in the hollow casing adjacent to the sensor, and Second, the inner pin of the ring body is disposed, and the ring is Fixing the sensor in cooperation with the outer casing, each inner leg having a first end adjacent to the first opening of the hollow housing, and a second end adjacent to the second opening, the inner end a second end of one of the pins is inserted into the ground hole, and a second end of the other of the inner pins is electrically connected to the piezoelectric piece; and a circuit board is disposed therein The empty housing is adjacent to the first opening and is electrically connected to the first end of the outer legs and the first end of the inner legs. The stacked ultrasonic sensor device according to claim 1, wherein the hollow casing of the outer casing further has a first reduction provided at the second opening to reduce the diameter of the second opening and have elasticity. a vibration ring, the fixing ring further includes a second damper ring having a side of the ring body adjacent to the sensor and having elasticity, the surrounding wall of the sensor has a radially outward extension from a side of the first opening, And a limiting flange is clamped between the first damping ring and the second damping ring. The stacked ultrasonic sensor device according to claim 1, wherein the hollow housing further includes at least one limiting chute formed on the inner circumferential surface and extending in the axial direction; the fixing ring further comprising at least one And disposed on the outer peripheral surface of the ring of the retaining ring and slidably disposed on the limiting slot to limit the limiting protrusion of the retaining ring displaced along the axial direction. The stacked ultrasonic sensor device according to claim 1, wherein the inner leg of the inner leg defining the fixing ring is inserted into the grounding hole of the sensor is a first ground a wire pin, the other inner pin electrically connected to the piezoelectric piece is a first signal pin, and the external pins defining the hollow case are respectively a second signal pin and a second a grounding pin and a power pin, the circuit board is provided with five through holes for the first end of each inner leg to be through and electrically connected to the first end of each outer leg, the fixing ring of the fixing ring The first signal pin outputs a sensing signal from the piezoelectric piece to the circuit board, and is processed by the circuit board and output to the second signal pin of the hollow casing, the first grounding pin Electrically connecting to the second ground pin through the circuit board, The power pin supplies power to the board. The stacked ultrasonic sensor device according to claim 1, wherein the bottom wall of the sensor cooperates with the surrounding wall to define a hollow chamber, the hollow chamber is filled with an encapsulant, and the encapsulant is cured to The piezoelectric sheet is encapsulated within the sensor. The stacked ultrasonic sensor device according to claim 1, wherein the sensor further comprises a foam for pressing the piezoelectric sheet and for absorbing the shock. The stacked ultrasonic sensor device according to claim 6, wherein the bottom wall of the sensor cooperates with the surrounding wall to define a hollow chamber, and the hollow chamber is filled with an encapsulant, and the encapsulant is cured to The piezoelectric sheet and the foam are encapsulated in a sensor. The stacked ultrasonic sensor device according to claim 1, wherein the hollow housing is further filled with a potting glue, and the encapsulant is cured to encapsulate the circuit board and the fixing ring in the hollow housing.