sound generator

Abstract

This sound generator comprises a sound generating body (6) for generating a sound, and a housing (1) accommodating the sound generating body, wherein: the housing is configured from a base (2) including a base outer cylinder portion (21) and a separating wall (22) which is provided inside the base outer cylinder portion and to which the sound generating body is joined, a cover (3) covering an opening portion on a front surface side of the base outer cylinder portion, and a case (4) covering an opening portion on a rear surface side of the base outer cylinder portion; the case comprises a case rear surface portion (41) disposed so as to face the opening portion in the base outer cylinder portion, and a case width adjusting portion (42) provided upright from the case rear surface portion; and the case is joined to the base outer cylinder portion at an edge portion of the case width adjusting portion.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on Japanese Patent Application No. 2022-34433, filed on March 7, 2022, the contents of which are incorporated herein by reference. [Technical Field]

[0002] The present disclosure relates to sound generators. [Background technology]

[0003] An example of a vehicle sounder used in vehicle alarms, vehicle proximity notification devices, etc. is described in Patent Document 1. This sounder has a structure in which a sounding body is provided inside a housing made up of a cylindrical base, a case on the back of the base, and a cover on the front of the base. The acoustic characteristics of such a sounder are determined by the diameter of the sounding body, the size of the space formed between the base and the case, the size of the space formed between the base and the cover, etc. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-121249 Summary of the Invention

[0005] In the manufacture of such sound generators, the base, case, cover, and sound generator are designed to obtain the desired acoustic characteristics. For multiple products with different desired acoustic characteristics, adjusting the acoustic characteristics takes time if the base, case, cover, and sound generator are all designed for each product. In recent years, the acoustic characteristics desired for sound generators have become more diverse, and in order to quickly manufacture sound generators that meet customer needs, it is necessary to make it easier to adjust the acoustic characteristics. In view of the above, an object of the present disclosure is to provide a sound generator whose acoustic characteristics can be easily adjusted.

[0006] According to one aspect of the present disclosure, the sound generator comprises a sound-generating body and a housing that houses the sound-generating body, the housing being composed of a base outer tube portion, a base having a partition wall provided inside the base outer tube portion and to which the sound-generating body is joined, a cover that covers the opening on the front side of the base outer tube portion, and a case that covers the opening on the back side of the base outer tube portion, the case comprising a case back portion arranged to face the opening of the base outer tube portion and a case width adjustment portion erected from the case back portion, and joined to the base outer tube portion at the end of the case width adjustment portion.

[0007] In this way, by configuring the case on the back of the base to have a case width adjustment section between the case back and the base, it is possible to change the size of the space formed between the base and the case simply by changing the width of the case width adjustment section, thereby changing the acoustic characteristics of the sound generator, making it easy to adjust the acoustic characteristics of the sound generator.

[0008] From another point of view, the case width adjustment portion is configured integrally with the case rear surface portion.

[0009] This allows the manufacturing costs of the case to be reduced compared to when the case width adjustment portion and the case back portion are formed separately.

[0010] From another perspective, the case width adjustment portion is configured as a separate body from the case rear portion.

[0011] This makes it easier to adjust the size of the space formed between the base and the case compared to when the case width adjustment portion and the case back portion are configured as one unit.

[0012] From another perspective, the cover comprises a cover front portion arranged to face the opening of the base outer tube portion, and a cover width adjustment portion erected from the cover front portion, and is joined to the base outer tube portion at the end of the cover width adjustment portion.

[0013] In this way, by forming the cover on the front side of the base with a cover width adjustment section between the front cover section and the base, it is possible to change the size of the space formed between the base and the cover simply by changing the width of the cover width adjustment section, thereby changing the acoustic characteristics of the sound generator, thereby facilitating adjustment of the acoustic characteristics of the sound generator.

[0014] From another perspective, the sound generator comprises a sound generating body that generates sound and a housing that houses the sound generating body, the housing being composed of a base outer tube portion, a base having a partition wall provided inside the base outer tube portion and to which the sound generating body is joined, a cover that covers the opening on the front side of the base outer tube portion, and a case that covers the opening on the back side of the base outer tube portion, the cover comprising a cover front portion that is arranged to face the opening of the base outer tube portion and a cover width adjustment portion that stands upright from the cover front portion, and is joined to the base outer tube portion at the end of the cover width adjustment portion.

[0015] In this way, by forming the cover on the front side of the base with a cover width adjustment section between the front cover section and the base, it is possible to change the size of the space formed between the base and the cover simply by changing the width of the cover width adjustment section, thereby changing the acoustic characteristics of the sound generator, thereby facilitating adjustment of the acoustic characteristics of the sound generator.

[0016] From another point of view, the cover width adjustment portion is configured integrally with the cover front portion.

[0017] This allows the manufacturing costs of the cover to be reduced compared to when the cover width adjustment portion and the cover front portion are formed separately.

[0018] From another point of view, the cover width adjustment portion is configured as a separate body from the cover front portion.

[0019] This makes it easier to adjust the size of the space formed between the base and the cover compared to when the cover width adjustment portion and the cover front portion are integrally configured.

[0020] From another perspective, the cover front portion includes one or more cover inner cylindrical portions erected toward the inside of the housing, and a resonance chamber is formed inside the housing by the cover inner cylindrical portions.

[0021] By providing a cover width adjustment section, it becomes possible to form such a cover inner cylindrical section, and a resonance chamber is further formed in the space formed between the base and the cover, allowing sound pressure to be amplified over a wide frequency band.

[0022] From another perspective, the cover inner cylindrical portion is formed to face the base inner cylindrical portion formed in the base, and the cover inner cylindrical portion and the base inner cylindrical portion form a resonance chamber.

[0023] According to this, the sound pressure of the sound generated by the sound generator is amplified by the resonance chamber, improving the acoustic characteristics of the sound generator.

[0024] From another perspective, the cover inner cylinder portion is formed to face the outer wall surface of the base inner cylinder portion formed in the base, and a resonance chamber is formed by the cover inner cylinder portion and the base inner cylinder portion.

[0025] According to this, the sound pressure of the sound generated by the sound generator is amplified by the resonance chamber, improving the acoustic characteristics of the sound generator.

[0026] From another point of view, at least one of the inside and outside of the part of the partition to which the sounding body is joined has the same shape as the part to which the sounding body is joined.

[0027] This allows a plurality of sound producing bodies with different diameters to be combined with a partition of the same shape, making it easier to adjust the acoustic characteristics of the sound producing body.

[0030] From another perspective, the partition is joined to the sound-producing body at a groove portion shaped to correspond to the end of the sound-producing body, and a groove portion of the same shape as the groove portion is formed on at least one of the inside and outside of the groove portion of the partition.

[0031] This allows a plurality of sound producing bodies with different diameters to be combined with a partition of the same shape, making it easier to adjust the acoustic characteristics of the sound producing body.

[0032] From another perspective, the sound-producing body has a tapered end, the partition is joined to the sound-producing body at a tapered portion that corresponds to the end of the sound-producing body, and a tapered portion of the partition that has the same shape as the tapered portion is formed on at least one of the inside and outside of the tapered portion.

[0033] This allows sound generating bodies of various diameters to be attached, and the acoustic characteristics of the sound generator can be finely adjusted.

[0034] The reference symbols in parentheses attached to each component indicate an example of the correspondence between the component and the specific components described in the embodiments described below. [Brief explanation of the drawings]

[0035] [Figure 1A] 1 is a front view showing the overall configuration of a sound generator according to a first embodiment. [Figure 1B] 1 is a left side view showing the overall configuration of a sound generator according to a first embodiment. FIG. [Figure 1C] FIG. 2 is a bottom view showing the overall configuration of the sound generator according to the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1A. [Figure 3] FIG. 10 is a cross-sectional view of a base with a large-diameter sounding body attached thereto. [Figure 4] FIG. 10 is a cross-sectional view of the sound generator according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0036] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the following embodiments, identical or equivalent parts will be denoted by the same reference numerals.

[0037] (First embodiment) A first embodiment will be described below. The sound generator of this embodiment is installed, for example, outside the cabin of an automobile and is used to generate an alarm sound.

[0038] As shown in Figures 1A to 1C and 2, the sound generator has a housing 1 with a space formed inside. Housing 1 is composed of a base 2, a cover 3, and a case 4, all made of resin. The sound generator also has a terminal 5 and a sound generator 6 arranged inside housing 1.

[0039] The base 2 has a substantially cylindrical base outer cylinder 21. A cover 3 is fitted to an opening at one end of the base outer cylinder 21 to cover this opening, and a case 4 is airtightly joined to an opening at the other end of the base outer cylinder 21 by adhesive.

[0040] The space inside the base outer cylinder part 21 is divided into two parts, a front side and a rear side, by a partition wall 22 provided inside the base outer cylinder part 21. In other words, the inside of the housing 1 is divided into a space formed by the base outer cylinder part 21, the partition wall 22, and the cover 3, and a space formed by the base outer cylinder part 21, the partition wall 22, and the case 4.

[0041] A circular through-hole 23 is formed in the inner periphery of the partition wall 22. A frame 61 (described later) is joined to the open end of the through-hole 23 in the partition wall 22, and the through-hole 23 is closed by the sound generating body 6.

[0042] At least one of the inside and outside of the portion of partition wall 22 to which frame 61 is joined has the same cross-sectional shape as the portion to which frame 61 is joined. Specifically, a circumferential groove 221 is formed on the back surface of partition wall 22 so as to surround through-hole 23. This groove 221 has a shape corresponding to the end of frame 61, and partition wall 22 is joined to frame 61 at this groove 221. Then, on the outside of groove 221, a groove 222 is formed which has the same cross-sectional shape but a larger radius than groove 221, so that a frame with a larger diameter than frame 61 shown in FIG. 2 can be attached to outer groove 222.

[0043] 3, when the frame 61 is joined to the outer groove portion 222, the inside of the portion of the partition wall 22 to which the frame 61 is joined has the same cross-sectional shape as the portion to which the frame 61 is joined. Note that three or more groove portions may be formed in the partition wall 22. For example, when three groove portions are formed and the frame 61 is joined to the second groove portion from the inside, both the inside and outside of the portion of the partition wall 22 to which the frame 61 is joined have the same cross-sectional shape as the portion to which the frame 61 is joined.

[0044] As shown in Figure 2, a shielding plate 24 is disposed on the front side of the sounding body 6. The shielding plate 24 prevents water and other substances adhering to the surface of the cover 3 from reaching the sounding body 6, thereby preventing damage to the sounding body 6 due to the adhesion of water and other substances. The shielding plate 24 is composed of a hollow truncated cone-shaped outer periphery that widens in the front direction, and a dome-shaped inner periphery that is convex toward the front side.

[0045] A cylindrical shielding tube portion 25 is formed at the open end of the partition wall 22. The shielding tube portion 25 protrudes from the end of the partition wall 22 toward the cover 3 side, and the shielding plate 24 is connected to the shielding tube portion 25 by a plurality of beam portions 26.

[0046] The sound generated by the sound generator 6 passes between the shielding plate 24 and the cylindrical shielding portion 25 and travels to the outside of the housing 1. The sound path formed by the shielding plate 24 and the cylindrical shielding portion 25 is referred to as a sound path 81.

[0047] The shielding plate 24 has a configuration for amplifying the sound pressure of sound that has passed through the sound passage 81. Specifically, the shielding plate 24 has a cylindrical base inner cylinder portion 27 that protrudes from the outer edge of the inner periphery toward the cover 3. A resonance chamber 82 is formed by the outer periphery of the shielding plate 24, the base inner cylinder portion 27, and the cover 3. A resonance chamber 83 is formed by the inner periphery of the shielding plate 24, the base inner cylinder portion 27, and the cover 3. By forming multiple resonance chambers in this way, it is possible to obtain a large sound pressure over a wide frequency band.

[0048] A ventilation hole (not shown) is formed in the partition wall 22 at a location away from the through-hole 23 and the sounding body 6. This ventilation hole is intended to prevent a pressure difference caused by temperature changes from occurring between the space formed by the base outer cylinder part 21, the partition wall 22, and the cover 3 and the space formed by the base outer cylinder part 21, the partition wall 22, and the case 4. A ventilation membrane that allows air to pass through but blocks water is stretched over this ventilation hole.

[0049] 1A to 1C and 2, a substantially rectangular cylindrical connector 28 is formed on the outside of the base outer cylinder portion 21. The connector 28 is used to electrically connect the sound generator 6 to an external harness (not shown). The connector 28 is disposed on the lower surface of the base outer cylinder portion 21, and opens downward from the housing 1.

[0050] Terminals 5 are arranged inside connector 28. Terminals 5 electrically connect the inside and outside of housing 1. Terminals 5 penetrate the side wall of base outer cylinder 21, and the bases of the portions of terminals 5 exposed from the inner wall surface of base outer cylinder 21 are covered with adhesive and fixed to base outer cylinder 21. Terminals 5 are connected to lead pins 64, which will be described later.

[0051] The cover 3 comprises an approximately disk-shaped cover front portion 31 arranged opposite the opening of the base outer tube portion 21, and an approximately cylindrical cover width adjustment portion 32 erected from the end of the cover front portion 31, and is joined to the base outer tube portion 21 at the end of the cover width adjustment portion 32.

[0052] The cover width adjustment unit 32 is used to adjust the size of the space formed between the base 2 and the cover 3 so as to obtain desired acoustic characteristics. The sound generated by the sound generator 6 resonates in the space formed between the base 2 and the cover 3, and the sound pressure is amplified and emitted to the outside of the housing 1. This resonance frequency is determined by the volume of the space, and the resonance frequency can be adjusted by the width of the cover width adjustment unit 32. Note that, although the cover width adjustment unit 32 is configured integrally with the cover front surface 31 in FIG. 2, the cover width adjustment unit 32 may also be configured separately from the cover front surface 31.

[0053] The cover front portion 31 is formed with a plurality of cover inner cylinder portions that stand upright toward the inside of the housing 1. Specifically, the cover front portion 31 has an inner circumferential portion 33 formed in a position corresponding to the base inner cylinder portion 27, and a resonance chamber 83 is formed by the inner circumferential portion of the shielding plate 24, the base inner cylinder portion 27, the cover front portion 31, and the cover inner cylinder portion 33.

[0054] A cover inner cylinder portion 34 is formed on the outer periphery of the cover front surface 31. The cover inner cylinder portion 34 is formed outside the shielding cylinder portion 25 and faces the outer wall surface of the base inner cylinder portion 27. A resonance chamber 84 is formed by the base outer cylinder portion 21, the partition wall 22, the cover front surface 31, the cover width adjustment portion 32, and the cover inner cylinder portion 34. A resonance chamber 85 is formed by the partition wall 22, the shielding cylinder portion 25, the base inner cylinder portion 27, the cover front surface 31, the cover inner cylinder portion 33, and the cover inner cylinder portion 34. Note that only one of the cover inner cylinder portion 33 and the cover inner cylinder portion 34 may be formed.

[0055] A circumferential through-hole 35 is formed in the cover front portion 31 in a portion between the cover inner cylindrical portion 33 and the cover inner cylindrical portion 34. The through-hole 35 is for discharging the sound, which has passed through the sound passage 81 and whose sound pressure has been amplified by the resonance chambers 82 to 85, to the outside of the housing 1.

[0056] 1A, the inside and outside of the through-hole 35 are connected by a beam portion 36. A plurality of beam portions 36 are formed, and the through-hole 35 is divided into a plurality of portions by the plurality of beam portions 36. These divided through-holes 35 open the internal space of the housing 1 to the atmosphere, and form sound emission holes 86 for emitting sound generated by the sound generator 6 to the outside.

[0057] The case 4 has an approximately circular disk-shaped case back portion 41 arranged opposite the opening of the base outer tube portion 21, and an approximately cylindrical case width adjustment portion 42 erected from the end of the case back portion 41, and is joined to the base outer tube portion 21 at the end of the case width adjustment portion 42.

[0058] The case width adjustment unit 42 is used to adjust the size of the space formed between the base 2 and the case 4 so as to obtain the desired acoustic characteristics. The resonance frequency of the sound generator 6 is determined by factors such as the volume of the space formed between the base 2 and the case 4, and a large sound pressure caused by resonance is emitted to the outside of the housing 1. This resonance frequency can be adjusted by the width of the case width adjustment unit 42. Note that, although the case width adjustment unit 42 is configured separately from the case rear part 41 in FIG. 2, the case width adjustment unit 42 may also be configured integrally with the case rear part 41.

[0059] As shown in FIG. 2, the sound generating body 6 includes a frame 61, a diaphragm 62, a driving portion 63, and a terminal metal fitting 64.

[0060] The frame 61 supports the diaphragm 62 and the drive unit 63. The frame 61 is generally cylindrical with a step, and has a larger opening on the front side than on the rear side. The opening on the front side of the frame 61 is closed by the diaphragm 62. The sound generator 6 is fitted into the groove 221 of the partition wall 22 at the open end on the front side of the frame 61, and is airtightly joined by adhesive. The frame 61 is made of resin.

[0061] Diaphragm 62 is composed of a hollow truncated cone-shaped outer peripheral portion that widens toward the front and a dome-shaped inner peripheral portion that is convex toward the front. As mentioned above, shielding plate 24 has a similar shape, and the inner and outer peripheral portions of shielding plate 24 face the inner and outer peripheral portions of diaphragm 62, respectively. A drive unit 63 is connected to the back surface of diaphragm 62.

[0062] The driving unit 63 vibrates the diaphragm 62. The driving unit 63 is composed of a bobbin around which a voice coil is wound, and a magnetic circuit unit that applies a magnetic field to the voice coil. The bobbin is cylindrical and is joined to the outer edge of the inner periphery of the diaphragm 62. The magnetic circuit unit includes a cylindrical yoke with a bottom, a disk-shaped magnet placed on the inner bottom surface of the yoke, and a disk-shaped top plate stacked on the magnet.

[0063] The yoke and top plate are made of magnetic material. The yoke opens toward the diaphragm 62 and is positioned to cover the opening on the rear side of the frame 61. A gap is formed between the magnet and the top plate and the side wall of the yoke. When the voice coil fits into this gap, the magnetic field generated between the top plate and the side wall of the yoke is applied to the voice coil. When a current is passed through the voice coil in this state, the bobbin is displaced axially, causing the diaphragm 62 to vibrate and generate sound. The voice coil is connected to the terminal 5 by lead wires and terminal fittings 64 (not shown).

[0064] Such a sound generator is disposed outside the vehicle cabin, more specifically, inside the front bumper of the vehicle, with the cover 3 positioned further forward than the case 2. When current is applied to the voice coil of the sound generator 6, the diaphragm 62 vibrates, generating sound. The sound emitted by the sound generator 6 passes through the gap formed between the shielding plate 24 and the diaphragm 62 and the sound passage 81, has its sound pressure amplified by the resonance chambers 82-85, and is emitted to the outside of the housing 1 through the sound emission hole 86.

[0065] The effects of this embodiment will be described below. In this embodiment, the case 4 includes a case back surface portion 41 disposed to face the opening of the base outer cylinder portion 21, and a case width adjustment portion 42 erected from the case back surface portion 41, and is joined to the base outer cylinder portion 21 at its end.

[0066] This allows the size of the space formed between the base 2 and the case 4 to be changed by simply changing the width of the case width adjustment portion 42, without changing the shapes of the base 2 and the case back portion 41, thereby changing the acoustic characteristics of the sound generator. This makes it easier to adjust the acoustic characteristics of the sound generator, and also reduces the manufacturing costs of the sound generator.

[0067] In addition, in this embodiment, the cover 3 comprises a cover front portion 31 arranged to face the opening of the base outer tube portion 21, and a cover width adjustment portion 32 erected from the cover front portion 31, and is joined to the base outer tube portion 21 at the end of the cover width adjustment portion 32.

[0068] This allows the size of the space formed between the base 2 and the cover 3 to be changed, and the acoustic characteristics of the sound generator to be changed, simply by changing the width of the cover width adjustment portion 32, without changing the shapes of the base 2 and the cover front portion 31. This makes it easier to adjust the acoustic characteristics of the sound generator, and also reduces the manufacturing costs of the sound generator.

[0069] In this embodiment, at least one of the inside and outside of the part of the partition wall 22 to which the sounding body 6 is joined has the same shape as the part to which the sounding body 6 is joined.

[0070] This allows a plurality of frames 61 with different diameters to be combined with partition 22 without changing the shape of partition 22 or the end shape of frame 61. This makes it easier to adjust the acoustic characteristics of the sound generator and reduces the manufacturing cost of the sound generator.

[0071] Furthermore, according to the above embodiment, the following effects can be obtained.

[0072] (1) When the case width adjustment portion 42 is integrally formed with the case back portion 41, the manufacturing cost of the case 4 can be reduced compared to when these are formed separately.

[0073] (2) When the case width adjustment portion 42 is configured separately from the case back portion 41, it is easier to adjust the size of the space formed between the base 2 and the case 4 than when they are configured as a single unit.

[0074] (3) When the cover width adjusting portion 32 is integrally formed with the cover front portion 31, the manufacturing cost of the cover 3 can be reduced compared to when these are formed separately.

[0075] (4) When the cover width adjustment portion 32 is configured separately from the cover front portion 31, it is easier to adjust the size of the space formed between the base 2 and the cover 3 than when they are configured integrally.

[0076] (5) The cover front portion 31 has one or more cover inner cylindrical portions that stand upright toward the inside of the housing 1, and the cover inner cylindrical portions form a resonance chamber inside the housing 1. By providing the cover width adjustment portion 32, it becomes possible to form such cover inner cylindrical portions, and a resonance chamber is further formed in the space formed between the base 2 and the cover 3, making it possible to amplify sound pressure over a wide frequency band.

[0077] (6) The cylindrical portion 33 is formed to face the base inner cylindrical portion 27, and a resonance chamber 83 is formed by the cylindrical portion 33 and the base inner cylindrical portion 27. As a result, the sound pressure of the sound generated by the sound generator 6 is amplified by the resonance chamber 83, improving the acoustic characteristics of the sound generator.

[0078] (7) The cylindrical portion 34 is formed to face the outer wall surface of the base inner cylindrical portion 27, and a resonance chamber 86 is formed by the cylindrical portion 34 and the base inner cylindrical portion 27. As a result, the sound pressure of the sound generated by the sound generator 6 is amplified by the resonance chamber 86, improving the acoustic characteristics of the sound generator.

[0079] (8) The partition 22 is joined to the frame 61 at a groove having a shape corresponding to the end of the frame 61, and at least one of the inside and outside of this groove has a groove having the same cross-sectional shape as this groove. This allows a plurality of frames 61 with different diameters to be combined with the partition 22 without changing the shape of the partition 22 or the end shape of the frame 61. This makes it easy to adjust the acoustic characteristics of the sound generator.

[0080] (Second embodiment) The second embodiment will be described. This embodiment is different from the first embodiment in that the shapes of the partition wall 22 and the frame 61 are changed, but the rest is the same as the first embodiment, so only the parts that are different from the first embodiment will be described.

[0081] 4, in this embodiment, the end of the frame 61 is tapered. Furthermore, the partition wall 22 is joined to the frame 61 at a tapered portion 223 having a shape corresponding to the end of the frame 61. On the inner and outer sides of the tapered portion 223 of the partition wall 22, tapered portions 224 and 225 having the same cross-sectional shape as the tapered portion 223 to which the frame 61 is joined are formed.

[0082] In addition, a tapered portion having the same cross-sectional shape as the tapered portion 223 to which the frame 61 is joined may be formed on only one of the inside and outside of the tapered portion 223 to which the frame 61 is joined.

[0083] This embodiment has the same configuration and operation as the first embodiment, and can therefore obtain the same effects as the first embodiment.

[0084] Furthermore, according to the above embodiment, the following effects can be obtained.

[0085] (1) Partition 22 is joined to frame 61 at tapered portion 223, which has a shape corresponding to the end of frame 61, and at least one of the inside and outside of tapered portion 223 is formed with a tapered portion having the same cross-sectional shape as tapered portion 223. This allows frames 61 of various diameters to be combined with partition 22, making it possible to fine-tune the acoustic characteristics of the sound generator.

[0086] (Other embodiments) The present disclosure is not limited to the above-described embodiments and can be modified as appropriate. It goes without saying that, in each of the above-described embodiments, the elements constituting the embodiments are not necessarily essential unless expressly stated as essential or clearly considered essential in principle. In each of the above-described embodiments, when numerical values ​​such as the number, numerical value, amount, and range of components of the embodiments are mentioned, they are not limited to the specific number unless expressly stated as essential or clearly limited to a specific number in principle. In each of the above-described embodiments, when the shape, positional relationship, etc. of components, etc. are mentioned, they are not limited to the shape, positional relationship, etc. unless expressly stated or limited to a specific shape, positional relationship, etc. in principle.

Claims

1. A sound generator, a sound generating body (6) that generates sound; a housing (1) that houses the sound-producing body, The housing is composed of a base (2) having a base outer cylindrical part (21) and a partition wall (22) provided inside the base outer cylindrical part and to which the sound-producing body is joined, a cover (3) covering an opening on the front side of the base outer cylindrical part, and a case (4) covering an opening on the back side of the base outer cylindrical part, The case comprises a case back portion (41) arranged to face the opening of the base outer tube portion, and a case width adjustment portion (42) erected from the case back portion, and a sound generator joined to the base outer tube portion at the end of the case width adjustment portion.

2. The sound generator according to claim 1 , wherein the case width adjustment portion is integral with the case rear portion.

3. The sound generator according to claim 1 , wherein the case width adjustment portion is formed separately from the case rear portion.

4. 2. The sound generator according to claim 1, wherein the cover comprises a cover front portion (31) arranged to face the opening of the base outer tube portion, and a cover width adjustment portion (32) erected from the cover front portion, and is joined to the base outer tube portion at an end of the cover width adjustment portion.

5. A sound generator, a sound generating body (6) that generates sound; a housing (1) that houses the sound-producing body, The housing is composed of a base (2) having a base outer cylindrical part (21) and a partition wall (22) provided inside the base outer cylindrical part and to which the sound-producing body is joined, a cover (3) covering an opening on the front side of the base outer cylindrical part, and a case (4) covering an opening on the back side of the base outer cylindrical part, The cover comprises a cover front portion (31) arranged to face the opening of the base outer tube portion, and a cover width adjustment portion (32) erected from the cover front portion, and a sound generator joined to the base outer tube portion at the end of the cover width adjustment portion.

6. 6. The sound generator according to claim 4, wherein the cover width adjustment portion is integral with the cover front portion.

7. 6. The sound generator according to claim 4, wherein the cover width adjustment portion is formed separately from the cover front portion.

8. The cover front portion includes one or more cover inner cylindrical portions (33, 34) extending upright toward the inside of the housing, 6. The sound generator according to claim 4, wherein a resonance chamber (82, 83, 84, 85) is formed inside the housing by the cover inner cylindrical portion.

9. The cover inner cylindrical portion is formed to face a base inner cylindrical portion (27) formed in the base, 9. The sound generator according to claim 8, wherein a resonance chamber is formed by the cover inner cylindrical portion and the base inner cylindrical portion.

10. The cover inner cylinder portion is formed to face an outer wall surface of a base inner cylinder portion (27) formed in the base, 9. The sound generator according to claim 8, wherein a resonance chamber is formed by the cover inner cylindrical portion and the base inner cylindrical portion.

11. 6. The sound generator according to claim 1, wherein at least one of the inside and outside of the part of the partition to which the sounding body is joined has the same shape as the part to which the sounding body is joined.

12. The partition is joined to the sound generating body at grooves (221, 222) having shapes corresponding to the ends of the sound generating body, 12. The sound generator according to claim 11, wherein a groove (221, 222) having the same shape as the groove is formed on at least one of the inside and outside of the groove in the partition.

13. The sounding body has a tapered end, The partition is joined to the sound-producing body at a tapered portion (223) having a shape corresponding to the end of the sound-producing body, 12. The sound generator according to claim 11, wherein a tapered portion (224, 225) having the same shape as the tapered portion is formed on at least one of the inside and outside of the tapered portion of the partition wall.

Images