CN113674726A - Buzzer device - Google Patents

Abstract

The invention provides a buzzer device, wherein a sound emission and drainage hole is arranged on a shell forming a resonance chamber into a roughly cylindrical hole shape, even if the installation angle of the shell on a supporting body is deviated, water flowing down to the lowest part of the circumferential surface along the circumferential surface of the resonance chamber can be smoothly drained from the sound emission and drainage hole, and the reduction of the sound emission performance from the sound emission and drainage hole is restrained. In a buzzer device (B) in which sound emission/drainage holes (H1-H3) are provided in a housing (10), a resonance chamber (C) arranged in the housing (10) together with a piezoelectric buzzer (30) is formed in a substantially cylindrical hole shape, edges (21) of the sound emission/drainage holes (H1-H3) on the outer side in the radial direction of the resonance chamber are adjacent to the circumferential surface (11ki) of the resonance chamber (C) in the axial direction of the resonance chamber, the edges (21) are formed so as to extend along the circumferential surface (11ki), and the sound emission/drainage holes (H1-H3) are formed in a size so as to surround a circle having a diameter of 5 mm or more.

Description

Buzzer device

Technical Field

The present invention relates to a buzzer device, and more particularly to a buzzer device comprising: a resonance chamber and a piezoelectric buzzer having a vibrating plate facing the resonance chamber are disposed in a case, and a sound emitting hole for emitting sound from the piezoelectric buzzer is provided in the case.

Background

Patent document 1 discloses a technique in which a casing having sound emission holes is provided with drain holes separately from the sound emission holes in the above buzzer device. Patent document 2 discloses a technique in which a sound emission/drainage hole serving as both a sound emission hole and a drainage hole is provided in a housing.

Documents of the prior art

Patent document 1: japanese Kokai publication Sho 57-93999

Patent document 2: japanese Kokai publication Sho 55-129854

Disclosure of Invention

Problems to be solved by the invention

In a structure in which the drain hole is provided in the casing separately from the sound emission hole as in the buzzer device of patent document 1, the resonance frequency in the resonance chamber changes as the drain hole increases, and a problem of a decrease in sound pressure arises.

Therefore, in order to solve this problem, it is conceivable to form the sound emission hole and the drain hole with a small diameter, but in this case, there is a possibility that the drainage property of the drain hole is lowered or a water film formed by surface tension spreads on the inner surface of the hole as the diameter is reduced, and there are other problems that the sound emission property is lowered by the water film, or water remaining in the case becomes a cause of a failure of the piezoelectric buzzer as an electronic component.

In a conventional structure in which a sound emission/drainage hole serving as both a sound emission hole and a drainage hole is provided in a casing as in patent document 2, the sound emission/drainage hole is a circular hole and is disposed in contact with the peripheral surface of a resonance chamber. Therefore, when the assembly angle of the housing to the support body (for example, a vehicle body or the like) to which the buzzer device is to be assembled varies, the communication portion between the sound emission/drainage hole and the circumferential surface of the resonance chamber is deviated from the lowermost portion of the circumferential surface of the resonance chamber, and therefore, water flowing down along the circumferential surface of the resonance chamber to the lowermost portion of the circumferential surface may not be smoothly drained from the sound emission/drainage hole.

In the component of patent document 2, if the sound emission/drainage hole has a small diameter, a defect due to a water film may occur in the same manner as in the structure of patent document 1.

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

Means for solving the problems

In order to achieve the above object, the present invention provides a buzzer unit including a resonance chamber and a piezoelectric buzzer having a vibration plate facing the resonance chamber, the casing being provided with a sound emission/drainage hole which is used for both sound emission from the piezoelectric buzzer and drainage from the resonance chamber, wherein the resonance chamber is formed in a substantially cylindrical hole shape, an outer edge of the sound emission/drainage hole in a radial direction of the resonance chamber is adjacent to a circumferential surface of the resonance chamber in an axial direction of the resonance chamber and extends along the circumferential surface, and the sound emission/drainage hole is formed in a size surrounding a circle having a diameter of 5 mm or more.

In addition to the first aspect, the present invention may be characterized as in claim 1, in accordance with a second aspect, wherein the sound emission/drainage hole is formed so that one edge portion and the other edge portion thereof in the circumferential direction of the resonance chamber are opened so as to be gradually separated from each other toward the outside in the radial direction of the resonance chamber, and are formed so as to be line-symmetrical with respect to a bisector in the circumferential direction of the resonance chamber of the sound emission/drainage hole.

Further, according to the present invention as defined in claim 3 of the present invention, in addition to the feature 2, one edge and the other edge of the sound emission/drainage hole in the circumferential direction of the resonance chamber are opened by 20 ° with respect to the bisector.

In addition to any one of the features 1 to 3, the present invention is characterized by claim 4 in that the sound emission/drainage hole has a plurality of holes, and the holes are arranged at intervals in a circumferential direction of the resonance chamber.

Further, according to the present invention, as for the 5 th aspect, in addition to any one of the 1 st to 4 th aspects, a width of an outer edge portion of the sound emission/drainage hole in a radial direction of the resonance chamber is larger than a width of an inner edge portion in a circumferential direction of the resonance chamber.

Further, according to the present invention, as recited in any one of the features 1 to 5, in the case, the front surface of the opening of the sound emission/drainage hole has a low-level surface portion and a high-level surface portion, the low-level surface portion is continuous with an outer edge portion of the sound emission/drainage hole in a radial direction of the resonance chamber, the high-level surface portion is continuous with other edge portions of the sound emission/drainage hole, and a stepped portion formed between the low-level surface portion and the high-level surface portion extends from both ends of the outer edge portion to a side of one edge portion and the other edge portion in a circumferential direction of the resonance chamber away from the sound emission/drainage hole.

In addition to any one of the features 1 to 6, the present invention is characterized by claim 7 in that a circumferential surface of the resonance chamber is formed as a tapered surface having a diameter gradually increased toward a front surface side of the case.

Effects of the invention

According to the first aspect of the present invention, in the buzzer unit having the sound emission/drainage hole in the case where the resonance chamber is formed in the substantially cylindrical hole shape, the sound emission/drainage hole is formed to have a size surrounding a circle having a diameter of 5 mm or more, and therefore, not only can the opening area of the hole be sufficiently ensured and excellent drainage performance be exhibited, but also the water film can be effectively suppressed from spreading on the inner surface of the hole, and the sound emission performance can be prevented from being lowered due to the water film. In addition, since the outer edge of the sound emission/drainage hole in the radial direction of the resonance chamber is formed to extend along the circumferential surface of the resonance chamber adjacent to the circumferential surface of the resonance chamber in the axial direction of the resonance chamber, the communication portion between the sound emission/drainage hole and the circumferential surface of the resonance chamber is expanded in the circumferential direction by the outer edge extending in the circumferential direction along the circumferential surface of the resonance chamber, and therefore, even when the mounting angle of the housing to the support body to which the buzzer device is to be mounted varies, the outer edge of the sound emission/drainage hole can be exposed to the lowermost portion of the circumferential surface of the resonance chamber, and therefore, water flowing down to the lowermost portion of the circumferential surface along the circumferential surface of the resonance chamber can be smoothly drained from the sound emission/drainage hole. In this way, the effect of the sound emission/drainage hole extending along the peripheral surface of the resonance chamber along the outer edge portion is supplemented with the dimensional effect of sufficiently securing the opening area, and the good and smooth drainage performance can be obtained without being affected by the variation of the mounting angle as a whole.

Further, according to the second aspect of the invention, since the sound emission/drainage hole is formed so as to be opened such that one edge portion and the other edge portion thereof on the circumferential direction of the resonance chamber are gradually separated from each other as approaching outward in the radial direction of the resonance chamber and so as to be line-symmetrical with respect to the bisector on the circumferential direction of the resonance chamber, even when the mounting angle of the housing with respect to the support body is deviated in one direction or the other direction from the normal mounting angle, smooth drainage of the sound emission/drainage hole can be ensured without being affected by the deviation.

Further, according to the 3 rd feature, since the one side edge and the other side edge of the sound emission/drainage hole in the circumferential direction of the resonance chamber are opened by 20 ° with respect to the bisector, even when the attachment angle of the housing with respect to the support body deviates from the normal attachment angle in one direction or the other direction, smooth drainage of the sound emission/drainage hole can be ensured without being affected by the deviation as long as the deviation is 20 ° or less.

Further, according to the 4 th aspect, since the plurality of sound emission/drainage holes are provided and are arranged at intervals in the circumferential direction of the resonance chamber, drainage can be performed regardless of which sound emission/drainage hole is arranged at the lowermost portion of the circumferential surface of the resonance chamber, and thus the degree of freedom in the mounting position of the housing to the support plate is improved.

Further, according to the 5 th aspect, since the width of the outer edge of the sound emission/drainage hole in the radial direction of the resonance chamber is larger than the width of the inner edge in the circumferential direction of the resonance chamber, the communication portion between the sound emission/drainage hole and the circumferential surface of the resonance chamber can be expanded in the circumferential direction without particularly increasing the opening area of each sound emission/drainage hole, and water flowing down along the circumferential surface of the resonance chamber can be more efficiently and smoothly drained from the sound emission/drainage hole.

Further, according to the 6 th aspect, the sound emission/drainage hole has a low-level surface portion and a high-level surface portion on the casing, the low-level surface portion being continuous with the outer edge portion of the sound emission/drainage hole in the radial direction of the resonance chamber, the high-level surface portion being continuous with the other edge portion of the sound emission/drainage hole, and the step portion formed between the low-level surface portion and the high-level surface portion extends from both ends of the outer edge portion to a side away from the one edge portion and the other edge portion of the sound emission/drainage hole in the circumferential direction of the resonance chamber, respectively.

Further, according to the 7 th aspect, since the peripheral surface of the resonance chamber is formed as a tapered surface having a diameter gradually increasing toward the front side of the housing, water descending along the peripheral surface smoothly flows to the lowermost end of the peripheral surface by the slope of the tapered surface, and can flow out of the housing through the sound emission/drainage hole opened therein. This enables more reliable drainage from the resonance chamber.

Drawings

Fig. 1 is an overall perspective view of a buzzer unit according to an embodiment of the present invention, as viewed from the front lower side.

Fig. 2 is a front view (view in the direction of arrow 2 in fig. 1) of the buzzer unit.

Fig. 3 is an enlarged sectional view taken along line 3-3 in fig. 2.

Fig. 4 is an enlarged sectional view taken along line 4-4 of fig. 2.

Fig. 5 is a partially cut-away perspective view of the buzzer unit mounted on the support plate, as viewed obliquely from the rear (a view in the direction of arrow 5 in fig. 3).

Fig. 6 is an exploded perspective view of the buzzer unit.

Fig. 7 is an explanatory diagram (an enlarged cross-sectional view in the direction of arrow 7 in fig. 4) showing an example of the flow of water that descends along the peripheral surface of the resonance chamber and reaches the sound emission/drainage hole.

Fig. 8 is an explanatory diagram (an enlarged cross-sectional view in the direction of arrow 8 in fig. 2) showing an example of the flow of water that exits from the resonance chamber and reaches the front surface side of the case from the sound emission/drainage hole.

In fig. 9, (a) is a front view of the buzzer unit in a vertical installation posture, (B) is a front view of the buzzer unit in a lateral installation posture to one side of the right and left, and (C) is a front view of the buzzer unit in a lateral installation posture to the other side of the right and left.

Description of the reference symbols

B: a buzzer device;

c: a resonance chamber;

H1-H3: 1 st to 3 rd sound reproduction and drainage holes as sound reproduction and drainage holes;

10: a housing;

11 ki: an inner peripheral surface of a resonance chamber forming wall portion as a peripheral surface;

15: a front face of the housing cover as a front face of the housing;

15 h: a high-level face part on the front face of the shell;

15 l: a lower face part on the front face of the shell;

15 s: a step portion of the front face of the housing;

21: an edge of the sound reproduction/drainage hole on the outer side in the radial direction of the resonance chamber;

22: an edge of the sound reproduction/drainage hole on one side in the circumferential direction of the resonance chamber;

23: an edge of the sound reproduction/drainage hole on the other side in the circumferential direction of the resonance chamber;

24: an edge of the sound emission/drainage hole on the inner side in the radial direction of the resonance chamber;

30: a piezoelectric buzzer;

31: a vibrating plate.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

First, in fig. 1 to 4, a buzzer device B for giving an alarm (for example, an alarm at the time of left turn, an alarm at the time of reverse movement, or the like) to a person or a driver outside a vehicle according to a driving situation is attached to an appropriate portion of a vehicle body of an automobile as a vehicle.

The buzzer device B is provided with: a case 10 made of synthetic resin; a resonance chamber C formed in the housing 10; a piezoelectric buzzer 30 having a vibrating plate 31 facing the resonance chamber C; and sound emission/drainage holes H1 to H3 provided in the casing 10 and used for both sound emission from the piezoelectric buzzer 30 and water drainage from the resonance chamber C. In particular, the sound emission/drainage holes H1 to H3 of the embodiment are plural and arranged at intervals in the circumferential direction of the resonance chamber C.

The casing 10 is formed by dividing a casing body 11 into a hollow box shape and a box-shaped casing cover 12, and the casing body 11 is fitted to the casing body 11 so as to cover the surface of the casing body 11 except the lower surface thereof with the casing cover 12.

A plurality of coupling mechanisms 13 for detachably coupling the housing main body 11 and the housing cover 12 are provided between the fitting surfaces of the housing main body and the housing cover, and each coupling mechanism 13 includes: a plurality of locking holes 12a provided in any one of the fitting surfaces (in the illustrated example, the housing cover 12); and a plurality of locking claws 11t that are provided to protrude from the other side (the housing body 11 in the illustrated example) and are locked in the plurality of locking holes 12a so as to be able to engage and disengage. The coupling means between the housing body 11 and the housing cover 12 is not limited to the coupling mechanism 13 of the embodiment, and may be, for example, screw fastening, caulking, pin fastening, or the like.

A jig 40 is selectively and detachably attached to a plurality of specific outer surfaces (e.g., left and right side surfaces and a back surface) of the housing cover 12, and the jig 40 is used to attach and fix the housing 10 to a support body that supports the buzzer unit B, e.g., a support plate F that is fixed to a vehicle body. The clip 40 is formed of an elastic material (e.g., hard rubber). The jig 40 may be directly attached to a plate-like portion fixed to the vehicle body without interposing the support plate F, and in this case, the vehicle body may be a support body.

Next, a mounting structure of the jig 40 will be explained. A pair of support rails 12r extending in the vertical direction and parallel to each other are provided in a protruding manner on a plurality of specific outer surfaces (for example, left and right side surfaces and a back surface) of the housing cover 12, and upper ends of the two support rails 12r are coupled to each other by a coupling frame 12s serving also as a slide stopper for the jig 40. On the other hand, the jig 40 includes a base 41, and the base 41 integrally includes a supported portion 41b slidably supported between the pair of support rails 12r on the back surface. On the facing surface between the rear surface (i.e., supported portion 41b) of the base 41 and the specific outer surface of the housing cover 12, 1 st and 2 nd locking projections 41bt and 12t that can be engaged with and disengaged from each other are formed.

Therefore, the base 41 (and thus the clip 40) can be fixed to a fixed position on the support rail 12r by locking the locking projections 41bt and 12t with each other and engaging the upper end of the supported portion 41b with the connecting frame 12 s.

In the state where the jig 40 is attached to the support plate F, the base distal end portion 41a rising in a tapered shape from the surface of the base 41 is disposed to face the support plate F via the buffer 43. Further, a support portion 45 is provided projecting from a central portion of the surface of the base 41, the support portion 45 extends outward through the center hole 43h of the cushion body 43, and a distal end portion of the support portion 45 integrally includes a pair of elastic locking claws 45t, and distal end portions of the pair of elastic locking claws 45t are engageable with the center hole 43h of the cushion body 43. The two elastic locking claws 45t have locking projections 45tk projected from the outer surfaces of the intermediate portions thereof, the locking projections 45tk being elastically locked to the edge portions of the engagement holes Fh of the support plate F, and the edge portions of the engagement holes Fh being held and fixed between the locking projections 45tk and the cushion body 43.

When the jig 40 attached to the housing 10 is attached to the support plate F, the cushion body 43 is temporarily fixed to the jig 40 in advance between the base distal end portion 41a and the elastic locking claw 45 t. Then, if the elastic locking claw 41t of the clip 40 is pressed into the engagement hole Fh of the support plate F from this state, the clip 40 can be attached to the support plate F as shown in fig. 4. In this way, the jig 40 (and hence the housing 10) can be fixed to the support plate F and hence to the vehicle body.

Next, the structure of the housing main body 11 will be described more specifically. The case body 11 includes: a box-shaped housing main body portion 11m whose front surface side is open; a substantially cylindrical resonance chamber forming wall portion 11k integrally coupled to an inner surface of the housing main body main portion 11 m; and a reinforcing rib 11a that integrally connects the resonance chamber forming wall 11k and the bottom wall of the case main body main portion 11m, and a connector portion 11c is integrally provided on the bottom surface of the case main body main portion 11 m.

The internal space of the resonance chamber forming wall portion 11k constitutes a resonance chamber C. The inner peripheral surface of the resonance chamber forming wall portion 11k of the embodiment is formed in a tapered shape gradually expanding in diameter toward the front side, and the tapered inner peripheral surface forms the peripheral surface 11ki of the resonance chamber C. The water entering the peripheral surface 11ki of the resonance chamber C smoothly flows down toward the front side of the housing 10 due to the inclination of the taper.

The 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 same. The piezoelectric buzzer 30 includes a diaphragm 31 having a disc shape and an outer peripheral portion fixed to the resonance chamber forming wall portion 11k, and a piezoelectric element 32 joined to a central portion of the diaphragm 31.

A pair of terminals 34, 35 are fixed to the back surface of the case main body main portion 11m, and one ends of the pair of terminals 34, 35 are connected to the diaphragm 31 and the piezoelectric element 32 via lead wires. The two 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 connector portion 11c, and the exposed portion constitutes a connector terminal portion connectable to an external connection. The connector terminal is connected to an electronic control device, not shown, via an external wiring.

The front wall of the case cover 12 is disposed adjacent to the resonant chamber forming wall 11k so as to close most of the front surface of the resonant chamber C. The front surface 15, which is the front surface of the housing cover 12, is provided with: a 1 st sound emission/drainage hole H1 that is the lowermost position in the case 10 arranged vertically (see fig. 9 a); a 2 nd sound emission/drainage hole H2 which is the lowermost position in a state where the casing 10 is disposed laterally to the left and right (see fig. 9 (B)); and a 3 rd sound emission/drainage hole H3 which is the lowermost position in a state where the casing 10 is disposed laterally on the other of the left and right sides (see fig. 9C).

The outer edge 21 of each of the sound emission/drainage holes H1 to H3 in the radial direction of the resonance chamber is adjacent to the circumferential surface 11ki of the resonance chamber C in the axial direction of the resonance chamber, and the edge 21 is formed to extend in the circumferential direction of the circumferential surface 11ki (in the embodiment, in an arc shape). The sound emission/discharge holes H1 to H3 are formed to surround a virtual circle X having a diameter of 5 mm or more.

In the present embodiment, a tapered small chamfered surface 11kic is formed at the outer edge portion of the peripheral surface 11ki of the resonance chamber C, and the peripheral surface 11ki of the resonance chamber C and the edge portion 21 are connected via a small step surface corresponding to the chamfered surface 11 kic. The chamfered surface 11kic may be omitted.

Further, the one-side rim 22 and the other-side rim 23 of each of the sound emission/drainage holes H1 to H3 in the circumferential direction of the resonance chamber are opened so as to be gradually separated from each other as they are located outward in the radial direction of the resonance chamber, and are formed so as to be line-symmetrical with respect to the bisector L in the circumferential direction of the resonance chamber of the sound emission/drainage holes H1 to H3.

In particular, in the present embodiment, as is apparent from fig. 8, the one-side rim portion 22 and the other-side rim portion 23 of the sound emission/drainage holes H1 to H3 are opened by 20 ° with respect to the bisector L that bisects the sound emission/drainage holes H1 to H3 in the circumferential direction of the resonance chamber through the center axis of the resonance chamber C (and hence the vibration plate 31).

The outer edge 21 of each of the sound emission/drainage holes H1 to H3 in the radial direction of the resonance chamber is formed to have a width larger than that of the inner edge 24 in the circumferential direction of the resonance chamber. In the embodiment, the inner edge 24 is formed in a mountain shape having a high middle inward in the radial direction of the resonance chamber, and thus the sound emission/drainage holes H1 to H3 can have the following hole shapes: the dimension of the imaginary circle X having a diameter of 5 mm or more is formed as described above, and the opening area of the hole can be suppressed as much as possible.

The front surface 15 of the casing 10 (more specifically, the casing cover 12) on which the sound emission/drainage holes H1 to H3 are opened has a low surface portion 15l and a high surface portion 15H, the low surface portion 15l is continuous with the edge portion 21 of the sound emission/drainage holes H1 to H3 on the outer side in the radial direction of the resonance chamber, and the high surface portion 15H is continuous with the other edge portions 22 to 24. The step portion 15s formed between the low-level surface portion 15l and the high-level surface portion 15H is formed to extend from both ends of the outer edge portion 21 to one side (in other words, linearly on an extension line of each of the edge portions 22 and 23) of the one edge portion 22 and the other edge portion 23 in the circumferential direction of the resonance chamber away from the sound emission/drainage holes H1 to H3, respectively.

Next, the operation of the embodiment will be described.

When an electric signal is transmitted from an electronic control unit, not shown, to the piezoelectric buzzer 30, the buzzer unit B generates an alarm sound by the vibration of the vibrating plate 31 in conjunction with the piezoelectric element 32, and the alarm sound is amplified by the resonance chamber C and is emitted from the 1 st to 3 rd sound emission/discharge holes H1 to H3.

Further, the jig 40 for attaching the housing 10 of the buzzer unit B to the support plate F as a support body can select a plurality of attachment postures of the housing 10 with respect to the support plate F by selectively attaching it to any one of a plurality of specific outer surfaces (left and right side surfaces and a back surface in the embodiment) of the housing 10 (more specifically, the housing cover 12). That is, as illustrated in fig. 9 (a) to (C), any one of a vertical mounting posture in which the 1 st sound emission/drainage hole H1 faces the lowermost portion of the resonance chamber C, a 1 st horizontal mounting posture in which the 2 nd sound emission/drainage hole H2 faces the lowermost portion of the resonance chamber C, and a 2 nd horizontal mounting posture in which the 3 rd sound emission/drainage hole H3 faces the lowermost portion of the resonance chamber C can be selected.

In the buzzer unit B, rainwater, dew condensation water, and the like may enter and stay in the casing 10, particularly in the resonance chamber C, and in this case, any one of the 1 st to 3 rd sound emission/drainage holes H1 to H3 (particularly, the sound emission/drainage hole located at the lowermost position) is used as the drainage hole in order to drain water to the outside. For example, when the casing 10 is in the vertical installation posture, the 1 st sound emission/drainage hole H1 located at the lowermost position serves as a drainage hole, and water is drained therefrom. When the casing 10 is in the horizontal installation posture on one side or the other side, the 2 nd sound emission/drainage hole H2 or the 3 rd sound emission/drainage hole H3 located at the lowermost position serves as a drainage hole, and water is drained therefrom.

An example of the drainage method will be described with respect to the case 10 in the vertical installation posture and the 1 st sound emission/drainage hole H1 serving as a drainage hole.

When water adheres to the peripheral surface 11ki of the resonance chamber C, the water flows down along the peripheral surface 11ki toward the lowermost portion. In this case, the peripheral surface 11ki of the resonance chamber C is a tapered surface having a diameter gradually increasing toward the front side (front side) of the housing cover 12, and therefore, as shown in fig. 7, the water W descending along the peripheral surface 11ki flows to the lowermost end of the peripheral surface 11ki due to the slope of the tapered surface, and flows out of the housing cover 12 through the 1 st sound emission/drainage hole H1 opened therein.

In the buzzer unit B of the present embodiment, the 1 st sound emission/drainage hole H1 is formed to have a size capable of surrounding the virtual circle X having a diameter of 5 mm or more, and therefore, not only can the opening area of the hole be sufficiently ensured and excellent drainage performance be exhibited, but also the water film can be effectively suppressed from spreading on the inner surface of the hole, and the sound emission performance degradation due to the water film can be prevented.

In addition, the outer edge 21 of the 1 st sound emission/drainage hole H1 in the radial direction of the resonance chamber is adjacent to the lowermost portion of the circumferential surface 11ki of the resonance chamber C in the axial direction of the resonance chamber, and the edge 21 is formed to extend along the circumferential surface 11ki (in the embodiment, in an arc shape). Accordingly, since the outer edge 21 extends long along the circumferential surface 11ki of the resonance chamber C, the communication portion between the 1 st sound emission/drainage hole H1 and the circumferential surface 11ki of the resonance chamber C expands in the circumferential direction, and therefore, even when the mounting angle of the housing 10 to the support plate F to which the buzzer unit B is to be mounted varies, the outer edge 21 of the 1 st sound emission/drainage hole H1 can be exposed to the lowermost portion of the circumferential surface of the resonance chamber C. Therefore, the water W flowing down along the peripheral surface 11ki of the resonance chamber C to the lowermost end of the peripheral surface 11ki can be smoothly discharged from the 1 st sound emission/drainage hole H1.

In this way, the effect of the 1 st sound emission/drainage hole H1, in which the outer edge 21 extends along the circumferential surface 11ki of the resonance chamber C, is supplemented with the dimensional effect of ensuring the opening area described above sufficiently, and good and smooth drainage can be obtained without being affected by the variation in the mounting angle as a whole, so that water is less likely to remain in the housing 10, and it is possible to contribute to suppressing the occurrence of a malfunction of the buzzer unit B.

Further, the 1 st sound emission/drainage hole H1 of the present embodiment is formed so that the one side edge 22 and the other side edge 23 in the circumferential direction of the resonance chamber are opened so as to be gradually separated outward in the radial direction of the resonance chamber, and are formed so as to be line-symmetrical with respect to the bisector L in the circumferential direction of the resonance chamber of the 1 st sound emission/drainage hole H1. Accordingly, even when the mounting angle of the housing 10 with respect to the support plate F around the center axis of the resonance chamber C (and hence the vibration plate 31) deviates in one direction or the other direction from the normal mounting angle, smooth drainage of the 1 st sound emission/drainage hole H1 can be ensured without being affected by the deviation.

In this case, in particular, in the present embodiment, since the one side edge 22 and the other side edge 23 of the 1 st sound emission/drainage hole H1 are opened by 20 ° with respect to the bisector L, the outer edge 21 of the 1 st sound emission/drainage hole H1 can be exposed to the lowermost portion of the peripheral surface 11ki of the resonance chamber C as long as the deviation of the attachment angle in one direction and the other direction is 20 ° or less. This ensures smooth drainage of the 1 st sound emission/drainage hole H1 without being affected by the variations.

In addition, the sound emission/drainage holes H1 to H3 of the present embodiment are plural and arranged at intervals in the circumferential direction of the resonance chamber. Accordingly, the water W can be discharged without any trouble regardless of which of the sound emission/drainage holes H1 to H3 is disposed at the lowermost portion of the circumferential surface 11ki of the resonance chamber C (in other words, regardless of which of the above-described vertical mounting posture and the lateral mounting posture of one side and the other side the housing 10 is mounted), and therefore the degree of freedom of the mounting position of the housing 10 to the support plate F is improved.

The outer edge 21 of each of the sound emission/drainage holes H1 to H3 in the radial direction of the resonance chamber is formed to have a width larger than that of the inner edge 24 in the circumferential direction of the resonance chamber. Accordingly, the communication portion between each sound emission/drainage 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 emission/drainage hole H1, and therefore, the water W flowing down along the peripheral surface 11ki of the resonance chamber C can be more efficiently and smoothly discharged from each sound emission/drainage hole H1.

In the present embodiment, the front surface 15 of the casing cover 12, on which the sound emission/drainage holes H1 to H3 are open, includes a low surface portion 15l and a high surface portion 15H, the low surface portion 15l is continuous with the outer edge portion 21 of the sound emission/drainage holes H1 to H3 in the radial direction of the resonance chamber, the high surface portion 15H is continuous with the other edge portions 22 to 24, and the step portion 15s formed between the low surface portion 15l and the high surface portion 15H extends from both ends of the outer edge portion 21 to the side away from the one edge portion 22 and the other edge portion 23 of the sound emission/drainage holes H1 to H3 in the circumferential direction of the resonance chamber. As a result, as shown in fig. 8, the water W reaching the front face 15 side of the casing 10 from the sound emission/drainage holes H1 to H3 can smoothly flow out along the step portion 15s by the surface tension, and therefore, the drainage of the sound emission/drainage holes H1 to H3 can be further improved.

While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the present invention described in the claims.

For example, in the above-described embodiment, the buzzer device B is provided for use in a vehicle such as an automobile, but the buzzer device of the present invention may be provided for use in various devices other than a vehicle.

In the above-described embodiment, the case where the outer edge 21 of the sound emission/drainage hole H1 in the radial direction of the resonance chamber is formed in an arc shape extending substantially along the circumferential surface 11ki of the resonance chamber C has been described, but the shape extending substantially along the circumferential surface 11ki of the resonance chamber C is not limited to the arc shape, and may be, for example, a straight line extending substantially along the circumferential surface 11ki of the resonance chamber C.

In the above-described embodiment, the case where the plurality of sound emission/drainage holes H1 to H3 are provided in the housing 10 so that the mounting posture of the buzzer unit B to the support body (support plate F) can be selected from a plurality of mounting postures is shown, but in the present invention, the sound emission/drainage holes may be single, and in this case, the buzzer unit is mounted to the support body only in a fixed posture.

Claims (8)

1. A buzzer device, in which a resonance chamber (C) and a piezoelectric buzzer (30) for making a vibration plate (31) face the resonance chamber (C) are arranged in a housing (10), sound emission/drainage holes (H1-H3) for discharging sound from the piezoelectric buzzer (30) and draining water from the resonance chamber (C) are arranged in the housing (10),

the buzzer unit is characterised in that it is,

the resonance chamber (C) is formed into a substantially cylindrical hole shape,

the outer edge (21) of the sound emission/drainage holes (H1-H3) in the radial direction of the resonance chamber is adjacent to the circumferential surface (11ki) of the resonance chamber (C) in the axial direction of the resonance chamber, and the edge (21) is formed to extend along the circumferential surface (11ki),

the sound emission/drainage holes (H1-H3) are formed in a size capable of surrounding a circle having a diameter of 5 mm or more.

2. The buzzer unit of claim 1,

one edge (22) and the other edge (23) of the sound emission/drainage holes (H1-H3) in the circumferential direction of the resonance chamber are opened so as to be gradually separated from each other as they are moved outward in the radial direction of the resonance chamber, and are formed so as to be line-symmetrical with respect to a bisector (L) in the circumferential direction of the resonance chamber of the sound emission/drainage holes (H1-H3).

3. Buzzer unit according to claim 2,

the sound emission/drainage holes (H1-H3) are opened at 20 DEG to the bisector (L) respectively at one edge (22) and the other edge (23) in the circumferential direction of the resonance chamber.

4. The buzzer unit of claim 1,

the sound emission/discharge holes (H1-H3) are provided in plural numbers and are arranged at intervals in the circumferential direction of the resonance chamber.

5. The buzzer unit of claim 1,

the sound emission/drainage holes (H1-H3) have an outer edge (21) that is wider in the radial direction of the resonance chamber than an inner edge (24) in the circumferential direction of the resonance chamber.

6. The buzzer unit according to any one of claims 1 to 5,

the front face (15) of the opening of the sound emission and drainage holes (H1-H3) on the shell (10) is provided with a low-level face part (15l) and a high-level face part (15H), the low-level face part (15l) is connected with the edge part (21) of the sound emission and drainage holes (H1-H3) on the outer side in the radial direction of the resonance chamber, the high-level face part (15H) is connected with other edge parts (22-24) of the sound emission and drainage holes (H1-H3),

a step portion (15s) formed between the low-level surface portion (15l) and the high-level surface portion (15H) extends from both ends of the outer edge portion (21) to one side of the edge portion (22) and the other side of the edge portion (23) in the circumferential direction of the resonance chamber, which are separated from the sound emission/drainage holes (H1-H3).

7. The buzzer unit according to any one of claims 1-5,

the circumferential surface (11ki) of the resonance chamber (C) is formed as a tapered surface having a diameter gradually increased toward the front side of the housing (10).

8. The buzzer unit of claim 6,

the circumferential surface (11ki) of the resonance chamber (C) is formed as a tapered surface having a diameter gradually increased toward the front side of the housing (10).

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