JP2011253032A - Sound emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device having such a feature as emitting loud sound but not a buzz sound, with ease and at low cost.SOLUTION: A sound emitting device includes: a housing; a substrate provided inside the housing; a case that incorporates a sound source mounted on the substrate; and a duct unit that is coupled to the substrate and the housing, and that covers the case. The case incorporating the sound source has an air hole and a sound emitting hole. The duct unit includes a partition for separating an interior space of the duct unit into an interior space of the duct unit that the air hole faces and an interior space of the duct unit that the sound emitting hole faces, as separate spaces. The housing includes a sound emitting portion corresponding to the interior space of the duct unit that the sound emitting hole of the duct unit faces.

Description

  The present invention relates to a sound emitting device.

  A sound emitting device shown in FIG. 11 is conceivable. In FIG. 11, 1 is a housing half (lid). Reference numeral 1 c denotes a sound emitting hole provided in the housing half (cover) 1. Reference numeral 2 denotes a housing half (housing main body). Reference numeral 3 denotes a packing (waterproof packing) provided to enhance the airtightness at the joint when the lid 1 and the housing body 2 are combined to form a housing. The packing 3 is compressed by being sandwiched between the lid 1 and the housing body 2, thereby achieving an airtight function (waterproof function). 4 is a buzzer (sound source). Reference numeral 5 denotes a first circuit board. The buzzer 4 is mounted on the circuit board 5. Reference numeral 7 denotes a second circuit board. Reference numeral 8 denotes a frame. 9 is a waterproof sheet.

Japanese Utility Model Publication No. 6-15364 Japanese Utility Model Publication No. 7-39193 JP 2001-229468 A

  By the way, the above sound emitting device has a sealed structure. For this reason, it is difficult to emit sound efficiently. Further, since the circuit board 5 cannot be sufficiently fixed, the circuit board 5 vibrates inside the housing by the sound of the buzzer 4. Because of this vibration, the sound has a flicker. And sound pressure is greatly lost. In order to cope with this significant loss of sound pressure, it was necessary to select components with a large margin when selecting acoustic components. For this reason, the cost is high.

  In order to reduce the loss of sound pressure, it is conceivable to add a resonance cylinder 12.

  However, each part is necessary for the vibration prevention measure and the sound pressure loss countermeasure. Furthermore, a part for blocking the sound of opposite phase may be necessary. For this reason, in order to solve each problem, there are problems such as an increase in the number of parts, an increase in parts cost, and an increase in assembly process.

  Therefore, the problem to be solved by the present invention is to solve the above problem. That is, the sound to be emitted is loud and there is no tingling sound, and an apparatus having such a feature can be provided simply and at low cost.

The above issues are
A housing, a substrate disposed in the housing, a case body containing a sound source mounted on the substrate, and a cylindrical body connected to the substrate and the housing and surrounded by the case body. A sound emitting device,
The case body incorporating the sound source includes an air hole and a sound emitting hole,
The cylindrical body includes a partition portion that partitions the cylindrical space facing the air hole and the cylindrical space facing the sound emitting hole into separate spaces,
The casing is solved by a sound emitting device comprising a sound emitting portion corresponding to a space in the cylinder facing the sound emitting hole of the cylinder.

  It is effectively suppressed that the substrate on which the sound source component is mounted due to the sound is vibrated, and a sound without a beating sound is efficiently emitted. Furthermore, since the space in the cylinder facing the air hole and the sound emission hole is partitioned by a part of the cylinder so that it becomes a separate independent space, the sound from the sound source is canceled due to the phase difference This phenomenon is difficult to occur, and loss of the emitted sound is difficult to occur. Moreover, the mechanism for achieving the above features is simple, and a sound emitting device can be obtained at low cost.

The disassembled state perspective view which shows the internal structure of the sound emission apparatus which becomes 1st Embodiment. The top view of the sound emission device which becomes 1st Embodiment AA sectional view of FIG. Enlarged view of part a in FIG. The perspective view which shows the connection structure with respect to the board | substrate of a cylinder and the housing | casing in the sound emission device which becomes 1st Embodiment. Detailed view of part a in FIG. Explanatory drawing of the principal part of the sound emission device which becomes 2nd Embodiment. Explanatory drawing of the principal part of the sound emitting device according to the third embodiment. The disassembled state perspective view which shows the internal structure of the sound emission device which becomes 4th Embodiment. AA sectional view of FIG. Cross-sectional view of a conventional sound emitting device

  The present invention is a sound emitting device. The sound emitting device particularly includes a casing, a substrate, a case body, and a cylinder. The housing is, for example, a sealed housing having a waterproof function. The substrate is disposed in the housing. The case body has a built-in sound source. The sound source is an acoustic component that emits an alarm sound, for example. The case body is mounted on the substrate. The cylindrical body connects the substrate and the housing. By this connection (fixation), the substrate has vibration damping properties. The cylindrical body surrounds the case body. The case body includes an air hole and a sound emitting hole. The cylinder includes a partition portion. The partition portion partitions the space in the cylinder into a cylinder space facing the air hole and a cylinder space facing the sound emitting hole. The housing includes a sound emitting unit. The sound emitting portion corresponds to a cylindrical space facing the sound emitting hole of the cylindrical body.

  The casing preferably includes a cylindrical fitting portion. By fitting the cylindrical body (a part of the cylindrical body) into the fitting portion, the cylindrical body is fixed to the housing. A substrate is connected to the cylindrical body. As a result, the substrate has vibration damping properties. Therefore, vibration due to vibration caused by the sound source in the mounted case body is prevented.

  The in-cylinder space that faces the sound emitting hole formed by the partition portion preferably has a resonant cylinder structure. The cylindrical space of this resonant cylinder structure is connected to the sound emitting part of the casing. And the sound from a sound source is guide | induced to the sound emission part via the space in the cylinder which the said sound emission hole and the said sound emission hole of the said resonance cylinder structure face.

  The housing includes, for example, a housing half (housing body) and a housing half (cover). A packing (waterproof packing) is preferably disposed at the abutting portion between the housing half (housing main body) and the housing half (cover). The casing has watertightness (airtightness) by the sandwiched packing.

  The housing includes a substrate (for example, a circuit board) and a sound source (for example, an acoustic component; buzzer). Furthermore, a cylinder (nozzle) is incorporated. The cylinder (nozzle) is press-fitted into the fitting portion (boss) of the casing. Due to the large frictional resistance due to the press-fitting, the cylindrical body and the housing are firmly integrated. As a result, the vibration of the substrate (circuit board) due to the sound of the sound source (acoustic component; buzzer) is suppressed. In addition, the sound chatter is suppressed. Furthermore, since the cylindrical body (nozzle) has a resonant cylindrical structure, the sound of the sound source (acoustic component: buzzer) is efficiently emitted from the sound emitting unit. The case body of the sound source (acoustic component; buzzer) includes a sound emitting hole and an air hole. The holes exist in separate spaces (space y and space z) partitioned by partition portions (ribs) of the cylinder (nozzle). Therefore, even if the sound from the sound emission hole and the sound from the air hole are in opposite phases, each sound is blocked, so that the loss of the sound canceled by the phase difference is reduced.

  That is, vibration suppression of the substrate and sound pressure loss reduction are achieved with a simple structure.

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

  1-6 is explanatory drawing of 1st Embodiment of the sound emission apparatus which becomes this invention. FIG. 1 is an exploded perspective view showing the internal configuration of the sound emitting device. FIG. 2 is a plan view. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 4 is an enlarged view of a main part in FIG. FIG. 5 is a perspective view showing a connecting structure of the cylinder (nozzle) to the substrate and the housing. FIG. 6 is a detailed view of a portion in FIG.

  In each figure, 1 is a housing half (lid). Reference numerals 1 a and 1 a ′ are cylindrical bosses formed at predetermined positions of the housing half 1. 1c is a sound emission part (sound emission hole) provided in the location of the boss | hub 1a. Reference numeral 2 denotes a housing half (housing main body). The housing half (lid body) 1 and the housing half body (housing body) 2 constitute a housing (enclosure housing). 3 is a substantially rectangular ring-shaped waterproof packing. The waterproof packing 3 is disposed in a concave groove formed in a butt (joint surface) between the housing half (lid) 1 and the housing half (housing main body) 2. The volume of the waterproof packing 3 is slightly larger than the volume of the inner space of the concave groove. Therefore, when the housing half (lid) 1 and the housing half (housing main body) 2 are joined together and joined by the waterproof packing 3 disposed in the concave groove, the housing (enclosure housing) Watertightness (airtightness) is ensured.

  Reference numeral 4 denotes a buzzer (acoustic component) having a configuration in which a sound source is built in a case body. A sound emitting hole 4 a and an air hole 4 b are formed in the case body of the buzzer 4. If the sound emitting hole 4a is formed in the right side wall of the case body 4, the air hole 4b is formed in the left side wall of the case body 4 (see FIG. 4). That is, the holes 4a and 4b are formed at positions where the phases are shifted by 180 °. The buzzer 4 is mounted on the circuit board 5, and the circuit board 5 is built in the housing. Reference numerals 5a, 5b, 5c, and 5d denote holes formed at predetermined positions of the circuit board 5 (positions around the buzzer 4 mounting position).

  6 is a cylinder (nozzle). The cylinder 6 has claws 6a, 6b, 6c, and 6d. When the cylindrical body 6 is arranged on the circuit board 5 so that the buzzer 4 can be accommodated inside, the claws 6a, 6b, 6c, 6d of the cylindrical body 6 are latched in the holes 5a, 5b, 5c, 5d of the circuit board 5. Then, the circuit board 5 and the cylindrical body 6 are integrated (connected: coupled). The cylindrical body 6 has a large-diameter portion with a large diameter that houses the buzzer 4 and a small-diameter portion with a small diameter located above the buzzer 4. The small diameter portion constitutes the resonance cylinder portion 6e. That is, it functions as a resonance cylinder. That is, the sound of the buzzer 4 reaching the space in the cylinder body 6 through the sound emitting hole 4a is resonated and expanded by the resonance cylinder portion 6e. The cylindrical body 6 has partition portions (ribs) 6f extending from the small diameter portion (resonance cylindrical portion) 6e. When the cylindrical body 6 is disposed so as to cover the buzzer 4, the tip of the partition 6 f comes into contact with the top surface of the buzzer 4. That is, the partition 6f divides the internal space of the cylinder 6 into a space z and a space y. Needless to say, the space z and the space y are two independent (separate) spaces by the partition 6f (see FIG. 4). The small diameter part (resonance cylinder part) 6 e of the cylindrical body 6 is also used for fixing the circuit board 5. That is, the circuit board 5 is fixed by press-fitting (fitting) the small diameter part (resonance cylinder part) 6e of the cylindrical body 6 into the boss 1a and into the boss 1a 'of the shaft 10 implanted in the circuit board 5. This is done by press-fitting (fitting). Therefore, the circuit board 5 vibrates in the thickness direction of the board due to the action of the buzzer 4 when the buzzer 4 rings, but the vibration is suppressed by the fixing force. And the horizontal positioning is also performed by the said fixation. That is, the vibration of the circuit board 5 due to the sound of the buzzer 4 is suppressed, the position of the circuit board 5 is determined, and the resonance cylinder part 6e of the cylinder 6 is a sound emission part (sound emission hole). Reduce sound loss to 1c.

  Reference numeral 7 denotes a second circuit board. Reference numeral 8 denotes a frame. The circuit board 5 and the circuit board 7 are held by a frame 8. 9 is a waterproof sheet. The waterproof sheet 9 is provided at the position of the sound emitting part (sound emitting hole) 1c. Reference numeral 10 denotes a shaft.

  In the sound emitting device configured as described above, the circuit board 5 on which the buzzer is mounted is provided in the boss 1a of the small diameter part (resonance cylinder part) 6e of the cylindrical body 6 on which the circuit board 5 is hooked. It is firmly integrated (fixed) by press-fitting (fitting) and further by press-fitting (fitting) the shaft 10 implanted in the circuit board 5 into the boss 1a ′. Therefore, since the circuit board 5 is firmly fixed, the vibration of the circuit board 5 in the vertical direction is suppressed even when the buzzer 4 sounds. As a result, the sound chatter is suppressed. The integration (fixing) operation is a simple operation such as press-fitting (fitting) the small diameter portion (resonance tube portion) 6e into the boss 1a and press-fitting (fitting) the shaft 10 into the boss 1a '. It's easy and very easy. And the resonance cylinder part 6e of the cylinder 6 has the function to transmit the sound of the buzzer 4 efficiently to the sound emission part 1c. That is, the rib 6f formed on the cylinder 6 separates the space in the cylinder 6 into the space y where the sound emitting hole 4a of the buzzer 4 faces and the space z where the air hole 4b faces separately. It is divided. Accordingly, the sound from the buzzer 4 through the sound emission hole 4a and the sound through the air hole 4b are blocked, and the phenomenon that the sound having the phase difference is canceled does not occur. There is no loss.

  FIG. 7 is an explanatory view of a second embodiment of the sound emitting device according to the present invention.

  In the first embodiment, the circuit board 5 and the cylinder 6 are integrated by hooking the claws 6a, 6b, 6c, 6d in the holes 5a, 5b, 5c, 5d. However, in this embodiment, it is performed with the double-sided tape 14.

  In FIG. 7, 4 is a buzzer, 5 is a circuit board, and 13 is a cylinder. In FIG. 7, since the claws are no longer necessary in the cylinder, the cylinder is denoted by 13 instead of 6. In addition, the same code | symbol as the code | symbol attached | subjected in the said 1st Embodiment is an equivalent member.

  FIG. 8 is an explanatory view of a third embodiment of the sound emitting device according to the present invention.

  In the first embodiment, the cylindrical body 6 and the boss 1a are fitted with each other even though the small-diameter portion (resonance cylindrical portion) 6e of the cylindrical body 6 is press-fitted into the boss 1a (see FIG. 4). On the other hand, in this embodiment, the small diameter part (resonance cylinder part) 6e of the cylinder 6 is press-fitted (see FIG. 8) outside the boss 1a. In addition, the same code | symbol as the code | symbol attached | subjected in the said 1st Embodiment is an equivalent member.

  9 and 10 are explanatory views of a fourth embodiment of the sound emitting device according to the present invention. FIG. 9 is an exploded perspective view showing the internal configuration of the sound emitting device. FIG. 10 is a cross-sectional view taken along the line AA of FIG.

  The first embodiment is an example in which the sound emitting part (sound emitting hole) 1 c is provided in the top plate part of the housing half (lid body) 1. In this embodiment, a sound emission part (sound emission hole) is provided in the side plate part of the housing half (housing body) 2.

  As can be seen from FIGS. 9 and 10, the circuit board 5 integrated with the cylindrical body 6 is fixed to the casing 1 by pressing the shaft 15 a provided in the cylindrical body 6 into the boss 1 a of the casing 1. . Reference numeral 15b denotes a resonance cylinder part of the cylinder 6 (corresponding to the resonance cylinder part 6e described in the first embodiment). Reference numeral 15c denotes a rib (corresponding to the partition portion (rib) 6f described in the first embodiment). The rib 15c divides the space where the sound emission hole 4a of the buzzer 4 faces from the space where the air hole 4b faces, and blocks the sound having a phase difference. The basic operations and effects of the present embodiment are the same as the operations and effects of the first embodiment. In addition, the same code | symbol as the code | symbol attached | subjected in the said 1st Embodiment is an equivalent member.

1 Housing half (lid)
1a, 1a 'Boss 1c Sound emission part (sound emission hole)
2 half housing (housing body)
3 Waterproof packing 4 Buzzer (acoustic parts)
4a Sound emission hole 4b Air hole 5 Circuit boards 5a, 5b, 5c, 5d Hole 6 Cylindrical body (nozzle)
6a, 6b, 6c, 6d Claw 6e Small diameter part (resonance tube part)
6f Partition (rib)
9 Tarpaulin 10 Shaft

Claims (3)

A housing, a substrate disposed in the housing, a case body containing a sound source mounted on the substrate, and a cylindrical body connected to the substrate and the housing and surrounded by the case body. A sound emitting device,
The case body incorporating the sound source includes an air hole and a sound emitting hole,
The cylindrical body includes a partition portion that partitions the cylindrical space facing the air hole and the cylindrical space facing the sound emitting hole into separate spaces,
The housing includes a sound emitting portion corresponding to a cylindrical space facing the sound emitting hole of the cylindrical body. The housing has a cylindrical fitting part,
By fitting the cylinder to the fitting portion, the cylinder is fixed to the housing,
2. The sound emitting device according to claim 1, wherein the substrate connected to the cylindrical body is prevented from being wobbled by vibration caused by a sound source in the mounted case body. The space inside the cylinder facing the sound emission hole configured by being partitioned by the partition part is a resonance cylinder structure, and is connected to the sound emission part of the housing,
The sound from the sound source is configured to be guided to a sound emitting portion via a cylindrical space facing the sound emitting hole and the sound emitting hole of the resonant cylinder structure. Or the sound emission apparatus of Claim 2.

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