Waterproof vibration transducer module

Abstract

We provide a waterproof vibration transducer module that is less prone to manufacturing variations. [Solution] The waterproof vibration transducer module includes a substrate with a through hole, a projection provided on one side to surround the through hole, and a vibration conversion die mounted on the other side to close the through hole, a hole, a holder including ribs at positions surrounding the hole, a barrier diaphragm located in a position overlapping the through hole and the hole in a stacking direction view, sandwiched between the projection and the rib, and vibrating in the space formed by the hole and the projection, a first case with sound holes formed therein, and a second case combined with the first case. The substrate, holder and barrier diaphragm are housed in an internal space formed by combining the first and second cases, the internal space is divided into two spaces by the holder and the barrier diaphragm, and the space on the second case side is sealed.

Description

Technical Field

[0001] This disclosure relates to a waterproof vibration transducer module.

Background Art

[0002] As an example of a conventional waterproof vibration transducer module, there is Patent Document 1. In the waterproof vibration transducer module of Patent Document 1, a waterproof vibration membrane is adhesively fixed to the lower surface of the case.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a waterproof vibration membrane is adhesively fixed to a case as in Patent Document 1, variations are likely to occur during manufacturing due to reasons such as the overflow of the adhesive.

[0005] Therefore, an object of this disclosure is to provide a waterproof vibration transducer module in which variations during manufacturing are unlikely to occur.

Means for Solving the Problems

[0006] The waterproof vibration transducer module of this disclosure includes a substrate, a holder, a barrier diaphragm, a first case, and a second case.

[0007] The substrate includes a through hole, a protrusion provided on one surface so as to surround the through hole, and a vibration conversion die mounted on the other surface so as to close the through hole.

[0008] The holder includes a hole and ribs at positions surrounding the hole.

[0009] The barrier diaphragm is positioned to overlap the through-holes and holes when viewed in the stacking direction, is sandwiched between the protrusions and ribs, and vibrates within the space formed by the holes and protrusions.

[0010] In the first case, a tone hole is formed.

[0011] The second case is combined with the first case.

[0012] The circuit board, holder, and barrier diaphragm are housed in an internal space formed by combining the first and second cases. The internal space is divided into two sections by the holder and barrier diaphragm, and the section on the second case side is sealed. [Effects of the Invention]

[0013] The waterproof vibration transducer module of this disclosure is less prone to manufacturing variations. [Brief explanation of the drawing]

[0014] [Figure 1] Plan view of the waterproof vibration transducer module of Example 1. [Figure 2] Perspective view of the waterproof vibration transducer module of Example 1. [Figure 3] Exploded perspective view of the waterproof vibration transducer module of Example 1. [Figure 4] Exploded perspective view of the waterproof vibration transducer module of Example 1. [Figure 5] CC cross-sectional view of the waterproof vibration transducer module of Example 1. [Modes for carrying out the invention]

[0015] The embodiments of this disclosure will be described in detail below. Components having the same function will be numbered the same, and redundant explanations will be omitted. [Examples]

[0016] Hereinafter, referring to FIGS. 1-5, the structure of the waterproof vibration transducer module of Example 1 will be described.

[0017] The waterproof vibration transducer module 1 of this embodiment includes a substrate 2, a holder 3, a barrier diaphragm 4, a first case 5, a second case 6, and a connector 7.

[0018] In FIGS. 1-5, the x-axis, y-axis, and z-axis are defined to indicate directions. As shown in FIG. 1, the direction from the first case 5 toward the connector 7 is defined as the +x direction, the opposite direction of the +x direction is defined as the -x direction, and as shown in FIG. 2, the direction from the second case 6 toward the first case 5 is defined as the +z direction, the opposite direction of the +z direction is defined as the -z direction, the direction perpendicular to the (+ / -)x direction and the (+ / -)z direction is defined as the (+ / -)y direction, the left direction when facing the +x direction is defined as the +y direction, and the opposite direction of the +y direction is defined as the -y direction.

[0019] As shown in FIG. 3, the substrate 2 includes a through hole 21 penetrating the substrate 2, a protrusion 22 provided on one surface (the surface in the +z direction) of the substrate 2 so as to surround the through hole 21, and a vibration conversion die 23 mounted on the other surface (the surface in the -z direction) of the substrate 2 so as to block the through hole 21 as shown in FIG. 4. The substrate 2 may be, for example, in a substantially rectangular plate shape. As shown in FIG. 3, the protrusion 22 may be formed in an annular shape so as to surround the through hole 21. For example, the protrusion 22 is more preferably in an annular shape with an inner diameter of φ8 - 12 mm and a height of 0.02 - 0.08 mm.

[0020] Further, the substrate 2 may include a notch filter (not shown) that blocks a predetermined frequency of the output signal from the vibration conversion die 23 and an amplifier circuit (not shown) that adjusts the level of the output signal from the vibration conversion die 23. By correcting the peak of the frequency characteristics generated due to the influence of the barrier diaphragm 4 with the notch filter, a flat frequency characteristic over a wide band can be obtained. Thereby, while ensuring waterproofness, it is possible to correspond to, for example, Fullband (50 Hz - 16 kHz) which is the specification of CarPlay (registered trademark).

[0021] As shown in FIG. 3, the holder 3 includes a hole 31 and a rib 32 at a position surrounding the hole 31. The hole 31 may be circular. It is preferable that the inner diameter of the hole 31 is larger than that of the through hole 21.

[0022] As shown in FIGS. 3 and 4, the rib 32 may be provided not only at a position surrounding the hole 31 but also at the ends of the holder 3 in the + / -x direction and + / -y direction, or may be provided on both one surface (+z direction surface) and the other surface (-z direction surface) of the holder 3. The rib 32 provided at a position surrounding the hole 31 contributes to the fixing of the barrier diaphragm 4 and the sealing structure (sealing structure), and the rib 32 provided at the end of the holder 3 contributes to the sealing structure (sealing structure).

[0023] As shown in FIG. 5, the upper and lower ribs 32 on the outside of the holder 3 (the ribs 32 located on the outermost + / -y sides) are sandwiched between the first case 5 and the second case 6, and the contact portions are sealed to prevent water from entering the space B where the vibration conversion die 23 is disposed.

[0024] Also, the upper and lower inner ribs 32 are sandwiched between the first case 5 and the diaphragm 4, and the contact portions are sealed to prevent water from entering the space B where the vibration conversion die 23 is disposed.

[0025] Therefore, the holder 3 (especially the rib 32) is more suitable because the sealing performance is increased if it is an elastic body having appropriate hardness. For example, it is more suitable if the holder 3 is made of a material with a Shore hardness of D40 - D70.

[0026] As shown in FIG. 3, the barrier diaphragm 4 is located at a position overlapping the through hole 21 and the hole 31 in the stacking direction (z-axis direction) view, and its end is sandwiched between the protrusion 22 and the rib 32, and vibrates in the + / -z direction within the space (void) formed by the hole 31 and the protrusion 22.

[0027] The barrier diaphragm 4 can be formed of, for example, a SUS material. Further, it is more suitable if the barrier diaphragm 4 has a circular shape with an outer diameter of φ10 - 16 mm and a thickness of 0.01 - 0.03 mm.

[0028] Thus, in this embodiment, the waterproof vibration transducer module 1 does not have the barrier diaphragm 4 glued and fixed to the case as in Patent Document 1, but rather is fixed by being sandwiched between the ribs 32 of the holder 3 and the protrusions 22 of the substrate 2, which has the advantage of being less prone to variations during manufacturing.

[0029] As shown in Figure 4, the first case 5 can be, for example, a case with a roughly rectangular parallelepiped shape that is open in the -z direction. A sound hole 51 is formed on the +z side surface of the first case 5.

[0030] As shown in Figure 3, it is preferable to form a cover portion 52 over the sound hole 51, which covers the hole 31 when viewed in the stacking direction (z-axis direction). For example, it is even preferable if the cover portion 52 covers 90 percent or more of the hole 31 when viewed in the stacking direction (z-axis direction).

[0031] Another way to describe the cover portion 52 is that the sound hole 51 is formed as an annular slit whose center is the same as the center of the hole 31 when viewed in the stacking direction (z-axis direction).

[0032] By forming a cover portion 52, or by forming the sound hole 51 as an annular slit with the same center as the center of the hole 31 when viewed in the stacking direction (z-axis direction), it is possible to prevent water jets during high-pressure cleaning from passing through the sound hole 51 and directly hitting the barrier diaphragm 4. This prevents the gap between the holder 3 and the barrier diaphragm 4 from being pushed open by water pressure and preventing water from entering space B, thus improving waterproof performance.

[0033] As shown in Figure 5, the sound holes 51 may be formed to penetrate the first case 5 at an angle different from the stacking direction (+ / -z direction) (in the example shown in the figure, diagonally downward left and diagonally downward right). By forming the sound holes 51 to penetrate the first case 5 at an angle different from the stacking direction (+ / -z direction), it is possible to prevent jets of water during high-pressure cleaning from directly hitting the barrier diaphragm 4.

[0034] The second case 6 is combined with the first case 5. As shown in Figure 3, the second case 6 can be, for example, a rectangular parallelepiped with an opening in the +z direction. The second case 6 may also include terminals 61 and a cable 62 that are electrically connected to the substrate 2. The -x end of the cable 62 is connected to terminal 61, and the +x end is connected to connector 7.

[0035] It is preferable that the terminal 61 and cable 62 are integrally formed with the second case 6. By integrally forming the terminal 61 and cable 62 with the second case 6, the terminal 61 and cable 62 are also waterproofed, improving the waterproof performance of the entire module.

[0036] As shown in Figure 5, the substrate 2, holder 3, and barrier diaphragm 4 are housed in an internal space formed by combining the first case 5 and the second case 6. As shown in the figure, the internal space is divided into two spaces (A and B) by the holder 3 and the barrier diaphragm 4, and space B on the second case 6 side is sealed.

[0037] The waterproof vibration transducer module 1 of this embodiment can be used, for example, in sound-collecting microphones that require waterproofing, sound-collecting microphones that require a flat frequency response over a wide bandwidth, sound-collecting microphones that require a high signal-to-noise ratio, and sound-collecting microphones that require high-pressure cleaning.

Claims

1. A substrate including a through hole, a projection provided on one side so as to surround the through hole, and a vibration conversion die mounted on the other side so as to close the through hole, A hole, and a holder including ribs at positions surrounding the hole, A barrier diaphragm is located in a position that overlaps the through hole and the hole when viewed in the stacking direction, is sandwiched between the projection and the rib, and vibrates within the space formed by the hole and the projection, The first case in which a tone hole is formed, Including a second case that is combined with the first case described above, The substrate, the holder, and the barrier diaphragm are housed in an internal space formed by combining the first and second cases, and the internal space is divided into two spaces by the holder and the barrier diaphragm, with the space on the second case side being sealed. Waterproof vibration transducer module.

2. A waterproof vibration transducer module according to claim 1, In the sound hole, A cover portion was formed that covers more than 90 percent of the holes when viewed in the stacking direction. Waterproof vibration transducer module.

3. A waterproof vibration transducer module according to claim 1, The aforementioned sound hole is, Formed as an annular slit with the same center as the center of the hole when viewed in the stacking direction. Waterproof vibration transducer module.

4. A waterproof vibration transducer module according to claim 2 or 3, The aforementioned sound hole is, Penetrating the first case at an angle different from the stacking direction Waterproof vibration transducer module.

5. A waterproof vibration transducer module according to claim 1, The two cases mentioned above are: The circuit board includes terminals and cables that are electrically connected to it. The terminal and the cable are, It is formed integrally with the second case mentioned above. Waterproof vibration transducer module.

6. A waterproof vibration transducer module according to claim 1, The aforementioned substrate is A notch filter that blocks a predetermined frequency of the output signal from the vibration conversion die, Includes an amplifier circuit that adjusts the level of the output signal from the vibration conversion die. Waterproof vibration transducer module.

7. A waterproof vibration transducer module according to claim 1, The aforementioned protrusion is It has an annular shape with an inner diameter of φ8-12 mm and a height of 0.02-0.08 mm. Waterproof vibration transducer module.

8. A waterproof vibration transducer module according to claim 1, The barrier diaphragm is It has a circular shape with an outer diameter of φ10-16 mm and a thickness of 0.01-0.03 mm. Waterproof vibration transducer module.

9. A waterproof vibration transducer module according to claim 1, The aforementioned holder is The Shore hardness is D40-D70. Waterproof vibration transducer module.

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