JP2021179576A - Buzzer device - Google Patents

Abstract

To make it possible, in a buzzer device in which sound emitting and draining holes are provided with a case which is a resonance chamber of a substantially cylindrical hole shape, to smoothly discharge water which is flown along a peripheral surface of the resonance chamber to the lowest portion of the peripheral surface from the sound emitting and draining hole, even if a mounting angle of the case to a support body varies, and to suppress deterioration of a sound emitting property from the sound emitting and draining hole as well.SOLUTION: In a buzzer device B in which a sound emitting and draining holes H1 to H3 are provided in a case 10, a resonance chamber C arranged together with a piezoelectric buzzer 30 is formed in the case 10 in a substantially cylindrical hole shape, and an outer edge 21 of the sound emitting and draining holes H1 to H3 in the radial direction of the resonance chamber is formed so as to be adjacent to the peripheral surface 11ki of the resonance chamber C in the axial direction of the resonance chamber and extend along the peripheral surface 11ki, and the sound emitting and draining holes H1 to H3 are formed in a size so as to surround a circle having a diameter of 5 mm or more.SELECTED DRAWING: Figure 8

Description

In the present invention, a buzzer device, particularly a resonance chamber in the case and a piezoelectric buzzer having a diaphragm facing the resonance chamber, is provided in the case, and a buzzer is provided in the case with a sound emitting hole for emitting sound from the piezoelectric buzzer. Regarding the device.

In the above buzzer device, a technique for providing a drainage hole in a case having a sound emitting hole separately from the sound emitting hole is disclosed in Patent Document 1. Further, Patent Document 2 discloses a technique of providing a sound emitting / draining hole in a case which also serves as a sound emitting hole and a drainage hole.

Jitsukaisho 57-93999 Gazette Jikkai Sho 55-129854

In a structure such as the buzzer device of Patent Document 1 in which a drain hole is provided in the case separately from the sound release hole, the resonance frequency in the resonance chamber changes with the addition of the drain hole, and a decrease in sound pressure becomes a problem.

Therefore, in order to solve this problem, it is conceivable to reduce the diameter of the sound emitting hole and the drainage hole. There is a risk that the water film will be stretched due to surface tension, and the water film will cause a decrease in sound emission, or the water remaining in the case will cause a failure of the piezoelectric buzzer, which is an electronic component. There is another inconvenience.

Further, in the conventional structure in which the sound emitting / draining hole that also serves as the sound emitting hole and the draining hole is provided in the case as in Patent Document 2, the sound emitting / draining hole is a circular hole and is in contact with the peripheral surface of the resonance chamber. Is located in. Therefore, when the mounting angle of the case to the support (for example, the vehicle body, etc.) to which the buzzer device should be assembled varies, the communication portion between the sound emitting / draining hole and the peripheral surface of the resonance chamber becomes the circumference of the resonance chamber. Since it is displaced from the bottom of the surface, there is a risk that the water flowing down to the bottom of the peripheral surface along the peripheral surface of the resonance chamber cannot be smoothly discharged from the sound emitting and draining holes.

Even in the member of Patent Document 2, if the sound emitting and draining hole has a small diameter, inconvenience due to the water film occurs as in the structure of Patent Document 1.

The present invention has been proposed in view of the above, and an object of the present invention is to provide a buzzer device capable of solving the above-mentioned problems of a conventional structure with a simple structure.

In order to achieve the above object, in the present invention, a resonance chamber and a piezoelectric buzzer having a vibration plate facing the resonance chamber are provided in the case, and sound is emitted from the piezoelectric buzzer and the resonance chamber is described. In the buzzer device provided in the case with a sound emitting / draining hole that is also used for draining water from the water, the resonance chamber is formed in a substantially cylindrical hole shape, and the sound emitting / draining hole is outward in the resonance chamber radial direction. The side edge is formed so as to be adjacent to the peripheral surface of the resonance chamber in the axial direction of the resonance chamber and extend along the peripheral surface, and the sound emitting and draining hole has a circle having a diameter of 5 mm or more. The first feature is that it is formed in a size that can be enclosed.

Further, in addition to the first feature, in the present invention, as the edge of the sound emitting / draining hole on one side and the edge on the other side in the circumferential direction of the resonance chamber are directed outward in the radial direction of the resonance chamber. The second feature is that the sound is opened so as to be gradually separated from each other and is formed line-symmetrically with respect to the bisector in the circumferential direction of the resonance chamber of the sound emitting and draining hole.

Further, in the present invention, in addition to the second feature, the edge of the sound emitting / draining hole on one side and the edge on the other side in the circumferential direction of the resonance chamber are each 20 ° with respect to the bisector. The third feature is that they are opened one by one.

Further, in addition to the first to third features, the present invention has a fourth feature that the sound emitting and draining holes are provided and arranged at intervals in the circumferential direction of the resonance chamber. And.

Further, in the present invention, in addition to any of the first to fourth features, the outer edge portion of the sound emitting / draining hole in the radial direction of the resonance chamber is more the resonance chamber than the inner edge portion. The fifth feature is that it is wide in the circumferential direction.

Further, in the present invention, in addition to any of the first to fifth features, the front surface of the case where the sound emitting / draining hole opens is outward in the resonance chamber radial direction of the sound emitting / draining hole. It has a low-level surface portion connected to the side edge portion and a high-level surface portion connected to other edge portions, and a step portion formed between the low-level surface portion and the high-level surface portion is the outer edge portion. The sixth feature is that the sound emitting / draining hole extends from both ends of the sound emitting / draining hole to the side separated from the one-sided edge portion and the other-sided edge portion in the circumferential direction of the resonance chamber.

Further, in addition to the first to sixth features, the seventh feature of the present invention is that the peripheral surface of the resonance chamber is formed as a tapered surface whose diameter is gradually increased toward the front side of the case. And.

According to the first feature, in a buzzer device in which a sound emitting / draining hole is provided in a case in which the resonance chamber has a substantially cylindrical hole shape, the sound emitting / draining hole is formed in a size surrounding a circle having a diameter of 5 mm or more. Therefore, not only is it possible to secure a sufficient opening area of the hole and exhibit good drainage, but also effectively suppress the formation of a water film on the inner surface of the hole, and the sound is emitted by the water film. It is possible to prevent deterioration of sex. Further, the outer edge of the sound emitting / draining hole in the radial direction of the resonance chamber is formed so as to be adjacent to the peripheral surface of the resonance chamber in the axial direction of the resonance chamber and to extend along the peripheral surface. Therefore, by extending the outer edge in the circumferential direction along the peripheral surface of the resonance chamber, the communication part between the sound emitting / draining hole and the peripheral surface of the resonance chamber expands in the circumferential direction, and therefore, the buzzer device is attached. Even if the mounting angle of the case to the support to be used varies, the outer edge of the sound emitting and draining hole can be exposed at the bottom of the peripheral surface of the resonance chamber, so that the peripheral surface of the resonance chamber can be exposed. The water that has flowed down to the bottom of the peripheral surface can be smoothly discharged from the sound emitting and draining holes. In this way, the sound emitting and draining hole has the effect of extending the outer edge of the hole along the peripheral surface of the resonance chamber and the size effect of sufficiently securing the above-mentioned opening area. Since good and smooth drainage as a whole can be obtained without being affected by the variation in the mounting angle, water is less likely to remain in the case, which can contribute to suppressing the occurrence of failure of the buzzer device.

Further, according to the second feature, the edge of the sound emitting / drainage hole on one side and the edge on the other side in the circumferential direction of the resonance chamber gradually open toward the outside in the radial direction of the resonance chamber. Since it is formed line-symmetrically with respect to the bisector in the circumferential direction of the resonance chamber of the sound emitting and drainage hole, the mounting angle of the case to the support is either one direction or the other direction from the regular mounting angle. Even if it varies, it is possible to ensure smooth drainage of sound and drainage holes without being affected by it.

Further, according to the third feature, the edge of the sound emitting / draining hole on one side and the edge on the other side in the circumferential direction of the resonance chamber are opened by 20 ° with respect to the bisector. Even if the mounting angle of the case to the support varies from the regular mounting angle to either one direction or the other direction, if the variation is 20 ° or less, the sound is emitted and the drainage hole is not affected by the variation. Smooth drainage can be ensured.

Further, according to the fourth feature, since there are a plurality of sound emitting / draining holes and they are arranged at intervals in the circumferential direction of the resonance chamber, any of the sound emitting / draining holes is provided at the lowermost part of the peripheral surface of the resonance chamber. Even if it is placed in the case, drainage is possible, and therefore, the degree of freedom in the mounting position with respect to the support of the case is increased.

Further, according to the fifth feature, since the outer edge of the sound emitting and draining hole in the radial direction of the resonance chamber is wider in the circumferential direction of the resonance chamber than the inner edge, the sound is emitted and also discharged. Sound can be emitted and the communication part between the drainage hole and the peripheral surface of the resonance chamber can be expanded in the circumferential direction without increasing the opening area of the drainage hole, and the water flowing down along the peripheral surface of the resonance chamber can be emitted. It can be drained more efficiently and smoothly than the drainage hole.

According to the sixth feature, the front surface of the case where the sound emitting / draining hole opens is the lower surface portion of the sound emitting / draining hole connected to the outer edge in the radial direction of the resonance chamber, and other edges. It has a high-level surface portion connected to the portion, and a stepped portion formed between the low-level surface portion and the high-level surface portion is one side in the circumferential direction of the resonance chamber of the sound emitting and drainage hole from both ends of the outer edge portion. Since it extends to the side away from the edge of the and the other side, the drainage that reaches the front side of the case from the sound emitting and draining hole can smoothly flow out through the stepped part due to the action of the surface tension, and the sound is emitted. The drainage property of the combined drainage hole can be further improved.

Further, according to the seventh feature, the peripheral surface of the resonance chamber is formed on a tapered surface whose diameter is gradually expanded on the front side of the case, so that the water flowing down the peripheral surface is peripheral due to the gradient of the tapered surface. It flows smoothly to the front end at the bottom of the surface, and can flow out of the case through the sound emitting and draining holes that open there. As a result, water can be drained from the resonance chamber more reliably.

Overall perspective view of the buzzer device according to the embodiment of the present invention as viewed from the front lower side. Front view of the buzzer device (2 arrow view in FIG. 1) Enlarged sectional view taken along line 3-3 in FIG. 4-4 line enlarged cross-sectional view of FIG. Partially broken perspective view of the buzzer device attached to the support plate viewed from diagonally behind (5 arrow view in FIG. 3). An exploded perspective view of the buzzer device Explanatory drawing showing an example of the flow of water flowing down the peripheral surface of the resonance chamber and reaching the sound emitting and draining hole (enlarged cross-sectional view of the 7th arrow in FIG. 4). Explanatory drawing showing an example of the flow of water that has left the resonance chamber and reached the front side of the case from the sound emitting and draining hole (enlarged cross-sectional view of the 8th arrow in FIG. 2). (A) is a front view of the buzzer device in the vertical mounting posture, (B) is a front view of the buzzer device in the horizontal mounting posture on one side of the left and right, and (C) is a horizontal mounting posture on the other side of the left and right. Front view of the buzzer device in

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

First, in FIGS. 1 to 4, a buzzer device B that issues an alarm (for example, an alarm when turning left, an alarm when reversing, etc.) to a person outside the vehicle or a driver at an appropriate position on the vehicle body of the vehicle as a vehicle, depending on the driving situation. Is attached.

The buzzer device B is provided in the case 10 made of synthetic resin, the resonance chamber C defined in the case 10, the piezoelectric buzzer 30 in which the vibration plate 31 faces the resonance chamber C, and the piezoelectric chamber C. It is provided with sound emitting and draining holes H1 to H3 that are used for both sound emission from the buzzer 30 and drainage from the resonance chamber C. In particular, there are a plurality of sound emitting / draining holes H1 to H3 of the embodiment, and they are arranged at intervals in the circumferential direction of the resonance chamber C.

The case 10 is divided into a case body 11 formed in a hollow box shape and a box-shaped case cover 12 fitted to the case body 11 so as to cover the surface of the case body 11 except for the lower surface. ..

A plurality of coupling mechanisms 13 are provided between the fitting surfaces of the case body 11 and the case cover 12 so as to be detachably coupled between the fitting surfaces, and each coupling mechanism 13 is one of the above fitting surfaces (illustrated example). Then, a plurality of locking holes 12a provided in the case cover 12) and a plurality of locking holes 12a projecting from one of the other (case body 11 in the illustrated example) and engaging with each other in a detachable manner. It is provided with a locking claw 11t. The coupling means between the case body 11 and the case cover 12 is not limited to the coupling mechanism 13 of the embodiment, and for example, coupling means such as screwing, caulking, and pinning can also be implemented.

On a plurality of specific outer surfaces (for example, left and right side surfaces and back surface) of the case cover 12, a support for supporting the buzzer device B, for example, a clip 40 for attaching and fixing the case 10 to a support plate F fixed to the vehicle body is selectively and fixed. It can be attached and detached. The clip 40 is made of an elastic material (eg, hard rubber). The clip 40 may be directly attached and fixed to the plate-shaped portion of the vehicle body without passing through the support plate F, in which case the vehicle body becomes the support.

Next, the mounting structure of the clip 40 will be described. A pair of support rails 12r extending in the vertical direction and parallel to each other are projected from the plurality of specific outer surfaces (for example, the left and right side surfaces and the back surface) of the case cover 12, and the upper ends of both support rails 12r slide with respect to the clip 40. It is connected by a connecting frame 12s that also serves as a stopper. On the other hand, the clip 40 has a pedestal 41 having a supported portion 41b slidably sandwiched and supported between the pair of support rails 12r on the back surface. The first and second locking projections 41bt and 12t that can be engaged with and detached from each other are formed on the facing surface of the back surface of the pedestal 41 (that is, the supported portion 41b) and the specific outer surface of the case cover 12.

Therefore, the pedestal 41 (hence, the clip 40) is fixed at a fixed position on the support rail 12r by locking the locking projections 41bt and 12t to each other and engaging the upper end of the supported portion 41b with the connecting frame 12s. It is possible.

Further, the pedestal tip portion 41a that rises from the surface of the pedestal 41 in a tapered shape is arranged so as to face the support plate F with the cushion body 43 in the mounted state of the clip 40 attached to the support plate F. Further, in the central portion of the surface of the pedestal 41, a strut portion 45 extending outward through the central hole 43h of the cushion body 43 is projected, and the tip portion of the strut portion 45 has a tip portion in the central hole 43h of the cushion body 43. It integrally has a pair of engageable elastic locking claws 45t. On the outer surface of the intermediate portion between the two elastic locking claws 45t, a locking protrusion 45 tk that can be elastically locked is provided on the edge of the engagement hole Fh of the support plate F, and the locking protrusion 45 tk The edge of the engagement hole Fh is sandwiched and fixed between the cushion body 43 and the engagement hole Fh.

When the clip 40 attached to the case 10 is attached to the support plate F, the cushion body 43 is temporarily fixed to the clip 40 in advance between the pedestal tip portion 41a and the elastic locking claw 45t. Then, if the elastic locking claw 41t of the clip 40 is pushed into the engaging hole Fh of the support plate F from that state, the clip 40 can be attached to the support plate F in the manner shown in FIG. Thus, the clip 40 (and thus the case 10) can be fixed to the support plate F, and thus to the vehicle body.

Next, the structure of the case body 11 will be described more specifically. The case main body 11 has a box-shaped case main body main portion 11 m having an open front side, a substantially cylindrical resonance chamber forming wall portion 11k integrally coupled to the inner surface of the case main body main portion 11 m, and a resonance chamber forming wall. A reinforcing rib portion 11a for integrally connecting the bottom wall portion 11k and the bottom wall portion of the case main body main portion 11m is provided, and a coupler portion 11c is integrally provided on the bottom surface of the case main body main portion 11m.

The internal space of the resonance chamber forming wall portion 11k constitutes the resonance chamber C. The inner peripheral surface of the resonance chamber forming wall portion 11k of the embodiment is formed in a tapered shape with a gently enlarged diameter on the front side, and the tapered inner peripheral surface constitutes the peripheral surface 11ki of the resonance chamber C. Due to the gradient of the taper, the water that has entered the peripheral surface 11ki of the resonance chamber C smoothly flows down to the front side of the case 10.

An outer peripheral portion of the piezoelectric buzzer 30 is attached to the open rear end of the resonance chamber forming wall portion 11k so as to close the opening rear end. The piezoelectric buzzer 30 has a disk-shaped diaphragm 31 whose outer peripheral portion is fixed to the resonance chamber forming wall portion 11k, and a piezoelectric element 32 joined to the central portion of the diaphragm 31.

A pair of terminals 34, 35, one end of which is connected to the diaphragm 31 and the piezoelectric element 32 via a lead wire, are fixed to the back surface of the case main body 11 m. Both terminals 34 and 35 are connected via a resistor 36, and the other ends of the terminals 34 and 35 extend downward and are exposed in the coupler portion 11c, and the exposed portion is connected to the external wiring. It constitutes a possible coupler terminal part. Thus, the coupler terminal portion is connected to an electronic control device (not shown) via external wiring.

The front wall portion of the case cover 12 is arranged adjacent to the resonance chamber forming wall portion 11k so as to close most of the front surface of the resonance chamber C. Then, on the front surface, that is, the front surface 15 of the case cover 12, there are a first sound emitting and draining hole H1 which is the lowest position when the case 10 is vertically arranged (see FIG. 9A), and the case 10. The second sound and drainage hole H2, which is the lowest position when placed horizontally on one of the left and right sides (see FIG. 9B), and the case 10 are placed horizontally on the other side of the left and right (see FIG. 9C). A third sound and drainage hole H3, which is the lowest position in the state of), is provided.

The outer edges 21 of the sound emitting and draining holes H1 to H3 in the radial direction of the resonance chamber are adjacent to the peripheral surface 11ki of the resonance chamber C in the axial direction of the resonance chamber and in the circumferential direction of the peripheral surface 11ki. It is formed to extend along (in the embodiment, in an arc shape). Moreover, each of the sound emitting and draining holes H1 to H3 is formed in a size that surrounds the virtual circle X having a diameter of 5 mm or more.

Further, in the present embodiment, a small tapered chamfered surface 11kic is formed on the outer edge of the peripheral surface 11ki of the resonance chamber C, and the circumference of the resonance chamber C is passed through a small stepped surface corresponding to the chamfered surface 11kic. The surface 11ki and the edge portion 21 are connected to each other. The chamfered surface 11kic may be omitted.

Further, the edge portion 22 on one side and the edge portion 23 on the other side in the circumferential direction of the resonance chamber of each of the sound emitting and draining holes H1 to H3 are opened so as to gradually separate from each other toward the outside in the radial direction of the resonance chamber. Therefore, the sound emitting and draining holes H1 to H3 are formed line-symmetrically with respect to the bisector L in the circumferential direction of the resonance chamber.

In particular, in the present embodiment, as clearly shown in FIG. 8, the edge portion 22 on one side and the edge portion 23 on the other side in the circumferential direction of the resonance chamber of the sound emitting and draining holes H1 to H3 are in the resonance chamber C (hence, therefore). Each of the sound emitting and draining holes H1 to H3 is opened by 20 ° with respect to the bisector L that bisects each of the sound emitting and draining holes H1 to H3 in the circumferential direction of the resonance chamber through the central axis of the diaphragm 31).

Moreover, the outer edge 21 of each sound emitting and draining hole H1 to H3 in the radial direction of the resonance chamber is formed wider in the circumferential direction of the resonance chamber than the inner edge 24. Further, in the embodiment, the inner edge portion 24 is formed in a middle-high chevron shape on the inner side in the radial direction of the resonance chamber, whereby the sound emitting and draining holes H1 to H3 are formed as described above. The hole shape can be formed so as to surround the virtual circle X having a diameter of 5 mm or more, but the opening area of the hole can be suppressed as much as possible.

Further, the front surface, that is, the front surface 15 of the case 10 (more specifically, the case cover 12) through which the sound emitting / draining holes H1 to H3 are opened is the outer side of the sound emitting / draining holes H1 to H3 in the radial direction of the resonance chamber. It has a low-level surface portion 15l connected to the edge portion 21 and a high-level surface portion 15h connected to the other edge portions 22 to 24. Then, the stepped portion 15s formed between the low surface portion 15l and the high surface portion 15h is unilateral in the resonance chamber circumferential direction of the sound emitting and draining holes H1 to H3 from both ends of the outer edge portion 21. It is formed so as to extend to a side away from the edge portion 22 and the other edge portion 23 (in other words, linearly on an extension line of the respective edge portions 22 and 23).

Next, the operation of the embodiment will be described.

In the buzzer device B, when an electric signal is sent to the piezoelectric buzzer 30 from an electronic control device (not shown), an alarm sound is emitted by the vibration of the vibrating plate 31 interlocked with the piezoelectric element 32, which is amplified in the resonance chamber C. The sound is emitted from the first to third sound emitting and draining holes H1 to H3.

Further, the clip 40 for attaching the case 10 of the buzzer device B to the support plate F as the support has a plurality of specific outer surfaces (more specifically, the left and right side surfaces in the embodiment) of the case 10 (more specifically, the case cover 12). By selectively mounting it on any of the back surfaces), it is possible to select a plurality of mounting postures of the case 10 with respect to the support plate F. That is, as illustrated in FIGS. 9A to 9C, the vertical mounting posture in which the first sound emitting / draining hole H1 faces the lowermost part of the resonance chamber C and the second sound emitting / draining hole The first horizontal mounting posture in which H2 faces the bottom of the resonance chamber C, and the second horizontal mounting posture in which the third sound emitting and drainage hole H3 faces the bottom of the resonance chamber C. Either can be selected.

By the way, in the buzzer device B, rainwater, dew condensation water, etc. may enter and stay in the case 10, especially in the resonance chamber C, and in that case, the first to third sound is emitted in order to discharge the water to the outside. Any one of the combined drainage holes H1 to H3 (particularly the sound emitting and drainage hole at the lowest position) is used as the drainage hole. For example, when the case 10 is in the vertical mounting posture, the first sound emitting and draining hole H1 at the lowest position serves as a drainage hole, and drainage is performed from there. When the case 10 is in the horizontal mounting posture on one side or the other side, the second sound emitting / draining hole H2 or the third sound emitting / draining hole H3 at the lowest position serves as a drainage hole. , Drained from there.

An example of the drainage mode will be described when the case 10 is in the vertical mounting posture and the first sound emitting and draining hole H1 serves as a draining hole.

When water adheres to the peripheral surface 11ki of the resonance chamber C, it flows down the peripheral surface 11ki to the lowermost side. In this case, since the peripheral surface 11ki of the resonance chamber C is a tapered surface whose diameter gradually increases toward the front side (front) of the case cover 12, the water W flowing down the peripheral surface 11ki is as shown in FIG. In addition, it flows to the lowermost front end of the peripheral surface 11ki due to the gradient of the tapered surface, and flows out of the case cover 11 from the first sound emitting and draining hole H1 opened there.

Therefore, in the buzzer device B of the present embodiment, the first sound emitting and draining hole H1 is formed in a size that surrounds the virtual circle X having a diameter of 5 mm or more, so that a sufficient opening area of the hole is secured. Not only is it possible to exhibit good drainage, but it is also possible to effectively suppress the formation of a water film on the inner surface of the hole and prevent a decrease in sound emission due to the water film.

Moreover, the outer edge 21 of the first sound emitting and draining hole H1 in the radial direction of the resonance chamber is adjacent to the lowermost portion of the peripheral surface 11ki of the resonance chamber C in the axial direction of the resonance chamber and its peripheral surface. It is formed so as to extend along 11 ki (in an arc shape in the embodiment). As a result, the outer edge portion 21 extends long along the peripheral surface 11ki of the resonance chamber C, so that the communication portion between the first sound emitting and drainage hole H1 and the peripheral surface 11ki of the resonance chamber C is in the circumferential direction. Even if the mounting angle of the case 10 to the support plate F to which the buzzer device B should be mounted varies, the outer edge 21 of the first sound emitting and draining hole H1 is circumscribed around the resonance chamber C. It can be exposed at the bottom of the surface. Therefore, the water W that has flowed down to the lowermost front end of the peripheral surface 11ki along the peripheral surface 11ki of the resonance chamber C can be smoothly discharged from the first sound emitting and draining hole H1.

As described above, the first sound emitting and draining hole H1 has the effect that the outer edge 21 of the first sound emitting and draining hole extends along the peripheral surface 11ki of the resonance chamber C, and the size that can sufficiently secure the above-mentioned opening area. Combined with the effect, good and smooth drainage as a whole can be obtained without being affected by the variation in the mounting angle. Therefore, it becomes difficult for water to remain in the case 10, and the occurrence of failure of the buzzer device B is suppressed. Can contribute to.

Further, the edge portion 22 on one side and the edge portion 23 on the other side in the circumferential direction of the resonance chamber of the first sound emitting and draining hole H1 of the present embodiment are gradually separated from each other toward the outside in the radial direction of the resonance chamber. It is open and is formed line-symmetrically with respect to the bisector L in the circumferential direction of the resonance chamber of the first sound emitting and draining hole H1. As a result, even if the mounting angle of the case 10 with respect to the support plate F around the central axis of the resonance chamber C (hence, the diaphragm 31) varies from the normal mounting angle to either one direction or the other direction, it is affected. The smooth drainage of the first sound emitting and draining hole H1 can be ensured without this.

In this case, particularly in the present embodiment, the one-sided edge portion 22 and the other-sided edge portion 23 of the first sound emitting and draining hole H1 are opened by 20 ° each with respect to the bisector L. Therefore, if the variation of the mounting angle in one direction and the other direction is 20 ° or less, the outer edge 21 of the first sound emitting and draining hole H1 is the maximum of the peripheral surface 11ki of the resonance chamber C. It can be exposed at the bottom. As a result, smooth drainage of the first sound emitting and draining hole H1 can be ensured without being affected by the above variation.

Moreover, there are a plurality of sound emitting and draining holes H1 to H3 of the present embodiment, and they are arranged at intervals in the circumferential direction of the resonance chamber. As a result, even if any of the sound emitting and draining holes H1 to H3 is arranged at the lowermost part of the peripheral surface 11ki of the resonance chamber C (in other words, the case 10 is placed in the above-mentioned vertical mounting posture, one side and the other side). Since the water W can be discharged without any trouble (regardless of which of the horizontal mounting postures of the case 10 is mounted), the degree of freedom in the mounting position of the case 10 with respect to the support plate F is increased.

Further, the outer edge portion 21 of each sound emitting / draining hole H1 to H3 in the radial direction of the resonance chamber is formed wider in the circumferential direction of the resonance chamber than the inner edge portion 24. As a result, the communication portion between each sound emitting / draining hole H1 and the peripheral surface 11ki of the resonance chamber C can be expanded in the circumferential direction without particularly increasing the opening area of each sound emitting / draining hole H1, so that the resonance chamber can be expanded. The water W flowing down along the peripheral surface 11ki of C can be discharged more efficiently and smoothly than each sound emitting and draining hole H1.

Furthermore, in the present embodiment, the front surface 15 of the case cover 12 through which the sound emitting / draining holes H1 to H3 are opened is the outer edge of the sound emitting / draining holes H1 to H3 in the radial direction of the resonance chamber. It has a low-level surface portion 15l connected to 21 and a high-level surface portion 15h connected to other edge portions 22 to 24, and a stepped portion 15s formed between the low-level surface portion 15l and the high-level surface portion 15h is on the outer side. From both ends of the edge portion 21, each of the sound emitting and draining holes H1 to H3 extends to the side away from the edge portion 22 on one side and the edge portion 23 on the other side in the circumferential direction of the resonance chamber. As a result, as shown in FIG. 8, the water W reaching the front 15 side of the case 10 from the sound emitting and draining holes H1 to H3 can smoothly flow out through the stepped portion 15s due to the action of surface tension. Therefore, the drainage property of each sound emitting and draining hole H1 to H3 can be further improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes are made without departing from the present invention described in the claims. Is possible.

For example, in the above embodiment, the buzzer device B is installed and used in a vehicle such as an automobile, but the buzzer device of the present invention may be installed and used in various devices other than the vehicle.

Further, in the above embodiment, the edge portion 21 of the sound emitting / draining hole H1 on the outer side in the radial direction of the resonance chamber is formed in an arc shape extending substantially along the peripheral surface 11ki of the resonance chamber C. The shape is not limited to an arc as long as it extends substantially along the peripheral surface 11ki of the resonance chamber C, and may be, for example, a linear shape extending substantially along the peripheral surface 11ki of the resonance chamber C. In order to ensure smooth drainage from the sound emitting and draining holes H1 to H3, the outer edge portion 21 is placed at a position where it is in frontal contact with the peripheral surface 11ki of the resonance chamber C or at a position lower than that. It is desirable to form.

Further, in the above embodiment, the case 10 is provided with a plurality of sound emitting and draining holes H1 to H3 so that the mounting posture of the buzzer device B on the support (support plate F) can be selected from a plurality of mounting postures. However, in the present invention, a single sound emitting / draining hole may be used, in which case the buzzer device is attached to the support only in a fixed posture.

B ... Buzzer device C ... Resonance chambers H1 to H3 ... 1st to 3rd sound emitting and draining holes as sound emitting and draining holes 10 ... Case 11ki ... As peripheral surface The inner peripheral surface of the resonance chamber forming wall 15 ... The front surface of the case cover as the front of the case 15h ... The high surface portion of the front of the case 15l ... The low surface portion of the front of the case 15s ... The step on the front of the case Part 21 ... The outer edge of the sound emitting and draining hole in the radial direction of the resonance chamber 22 ... The edge 23 of the sound emitting and draining hole on one side in the circumferential direction of the resonance chamber ...・ The edge 24 of the sound emitting and draining hole on the other side in the circumferential direction of the resonance chamber ・ ・ ・ ・ The edge 30 of the sound emitting and draining hole on the inner side in the radial direction of the resonance chamber ・ ・ ・ ・・ ・ ・ Vibration plate

Claims (7)

A resonance chamber (C) and a piezoelectric buzzer (30) having a vibration plate (31) facing the resonance chamber (C) are arranged in the case (10), and sound is emitted from the piezoelectric buzzer (30). In the buzzer device provided in the case (10) with sound emitting and draining holes (H1 to H3) that are also used for draining water from the resonance chamber (C).
The resonance chamber (C) is formed in a substantially cylindrical hole shape, and is formed.
The outer edge (21) of the sound emitting and draining holes (H1 to H3) in the radial direction of the resonance chamber is adjacent to the peripheral surface (11ki) of the resonance chamber (C) in the axial direction of the resonance chamber. And it is formed so as to extend along the peripheral surface (11ki).
The buzzer device is characterized in that the sound emitting and draining holes (H1 to H3) are formed in a size surrounding a circle having a diameter of 5 mm or more. The edge portion (22) on one side and the edge portion (23) on the other side of the sound emitting and draining holes (H1 to H3) in the circumferential direction of the resonance chamber gradually move outward in the radial direction of the resonance chamber. The first aspect of the present invention is characterized in that the sound is opened so as to be separated from each other and is formed line-symmetrically with respect to the bisector (L) in the circumferential direction of the resonance chamber of the sound emitting and draining holes (H1 to H3). Buzzer device. The edge portion (22) on one side and the edge portion (23) on the other side of the sound emitting and draining holes (H1 to H3) in the circumferential direction of the resonance chamber are 20 each with respect to the bisector (L). The buzzer device according to claim 2, wherein the buzzer device is opened by °. The buzzer according to any one of claims 1 to 3, wherein the buzzer having a plurality of sound emitting and draining holes (H1 to H3) are arranged at intervals in the circumferential direction of the resonance chamber. Device. The sound emitting and draining holes (H1 to H3) have a wider outer edge (21) in the radial direction of the resonance chamber than the inner edge (24) in the circumferential direction of the resonance chamber. The buzzer device according to any one of claims 1 to 4, wherein the buzzer device is characterized. The front surface (15) of the case (10) where the sound emitting / draining holes (H1 to H3) open is the outer edge of the sound emitting / draining holes (H1 to H3) in the radial direction of the resonance chamber. It has a low-level surface portion (15 l) connected to the portion (21) and a high-level surface portion (15 h) connected to the other edge portions (22 to 24).
The stepped portion (15s) formed between the lower surface portion (15l) and the higher surface portion (15h) emits sound and drains holes (H1 to H3) from both ends of the outer edge portion (21). ), Which one of claims 1 to 5, is characterized in that it extends to a side away from the edge portion (22) on one side and the edge portion (23) on the other side in the circumferential direction of the resonance chamber. The buzzer device described. One of claims 1 to 6, wherein the peripheral surface (11ki) of the resonance chamber (C) is formed on a tapered surface whose diameter is gradually increased on the front side of the case (10). The buzzer device described in.

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