JP2019165378A - Sound transmission structure of housing, electroacoustic transducer, and electronic device - Google Patents

Abstract

To provide a sound transmission structure for a housing that can provide a good housing passage sound even when water enters the housing through the sound passage hole of the housing.SOLUTION: A sound transmission structure includes a housing (1) that can accommodate an electroacoustic transducer (13) inside and has a sound passage hole group (61G) constituted by a plurality of sound passage holes (61), and a sheet (12a) having air permeability. The housing (1) has a groove group (11G) including at least one first groove (11a) extending in one direction at a position corresponding to the sound passage hole group (61G) on the inner surface (1a) and a plurality of second grooves (11b) having one end connected in parallel to the first groove (11a), and the groove group (11G) is located between the sound passage hole group (61G) and the sheet (12a).SELECTED DRAWING: Figure 4

Description

  The present invention relates to a sound transmission structure of a casing, and an electroacoustic conversion device and an electronic apparatus, and relates to a sound transmission structure of a casing in which an electroacoustic transducer such as a microphone or a speaker is housed, and the sound transmission structure thereof. The present invention relates to an electroacoustic transducer and an electronic device.

A housing in which an electroacoustic transducer such as a microphone or a speaker is housed has a sound passage structure including a sound passage hole for allowing sound to pass inside and outside.
And in order to make it possible to use the electroacoustic transducer and the electronic device having such a sound passage structure of the housing in the rain, even if rainwater enters the housing from the sound passage hole, it is discharged well to the outside. A sound passage structure has been studied, and is described in Patent Document 1 as a water draining structure for an intercom device.

  In the sound passage structure described in Patent Document 1, an opening formed corresponding to a speaker in a housing is covered with a plate having a vertically long sound passage hole, and the sound passage hole of the plate is closed on the inner surface of the housing. Waterproof film is affixed. As a result, the sound output from the speaker is released to the outside through the waterproof film and the sound passage hole, while the water that has entered from the outside through the sound passage hole accumulates between the plate and the waterproof film. Water flows out to the outside from the lower part of the sound emission hole by its own weight.

JP 2013-070262 A

In the structure described in Patent Document 1, since the opening area of the sound hole is small and the sound hole is covered with a waterproof film, the sound passing through the housing is released to the outside through the sound hole. There was room for improvement in that the sound pressure was small and the sound quality changed, making it difficult to obtain good listening sound.
Moreover, although the structure described in Patent Document 1 can be used for a sound collecting device that accommodates a microphone, the sound passing through the housing that reaches the internal microphone from the outside via the sound hole and the waterproof film of the housing. Similarly, there was room for improvement in that the sound pressure was small, the sound quality changed, and it was difficult to obtain a good collected sound.

  Therefore, the problem to be solved by the present invention is that the sound transmission structure of the housing that can obtain a good housing passage sound even when water enters from the sound passage hole of the housing, the electroacoustic transducer, and To provide electronic equipment.

In order to solve the above problems, the present invention has the following configuration.
1) A housing that can accommodate an electroacoustic transducer therein and has a group of sound holes made of a plurality of sound holes;
A breathable sheet;
With
The housing includes a plurality of first grooves extending in one direction and one end side connected to the first grooves at a position corresponding to the sound hole group on the inner surface thereof. A groove group including a second groove;
The groove group is located between the sound hole group and the sheet;
It is the sound transmission structure of the housing | casing characterized by these.
2) an electroacoustic transducer;
While housing the electroacoustic transducer inside, a housing having a sound passage hole group consisting of a plurality of sound passage holes,
A breathable sheet;
With
The housing includes a plurality of first grooves extending in one direction and one end side connected to the first grooves at a position corresponding to the sound hole group on the inner surface thereof. A groove group including a second groove;
The groove group is located between the sound hole group and the sheet;
An electroacoustic transducer characterized by the above.
3) a housing having a group of sound holes made of a plurality of sound holes;
An electroacoustic transducer housed inside the housing;
A display unit provided in the housing so as to be visible from the outside;
A breathable sheet;
With
The housing includes a plurality of first grooves extending in one direction and one end side connected to the first grooves at a position corresponding to the sound hole group on the inner surface thereof. A groove group including a second groove;
The groove group is located between the sound hole group and the sheet;
Is an electronic device characterized by

  According to the present invention, there is an effect that a good housing passage sound can be obtained even when water enters from the sound hole of the housing.

FIG. 1 is a front view showing a wireless device 51 that is Example 1 of the electronic apparatus according to the embodiment. FIG. 2 is a partially enlarged view of the vicinity of the sound passing portion 6 of the wireless device 51 shown in FIG. FIG. 3 is a perspective view showing the inner surface shape in the vicinity of the sound passing portion 6 in the casing 1 of the wireless device 51. 4 is a cross-sectional view at the position S4-S4 in FIG. FIGS. 5A and 5B are views showing the sheet assembly 12 used in the sound passing structure TK. FIG. 5A is a plan view, and FIG. FIG. 6 is a two-sided view showing the packing 14 used in the sound transmission structure TK of the housing according to the embodiment of the present invention, where (a) is a plan view and (b) is a position of S6b-S6b in the plan view. FIG. FIG. 7 is a perspective view for explaining the flow of rainwater in the groove group 11G when the wireless device 51 is used in the rain. FIG. 8 is a cross-sectional view for explaining the flow of rainwater in the front space Vf when the wireless device 51 is used in the rain. FIG. 9 is a front view showing a portable speaker 51 </ b> A that is Example 2 of the electronic apparatus according to the embodiment. FIG. 10 is a perspective view showing an inner surface shape in the vicinity of the sound passing portion 6A in the housing 1A of the portable speaker 51A. FIG. 11 is a cross-sectional view taken along S11-S11 in FIG. FIG. 12 is a partial front view showing a sound passing portion 6B of a wireless device 51B which is a modification of the wireless device 51. As shown in FIG. FIG. 13 is a perspective view showing an inner surface shape in the vicinity of the sound passing portion 6B in the housing 1B of the wireless device 51B. FIG. 14 is a cross-sectional view taken along S14-S14 in FIG. FIGS. 15A to 15G are diagrams illustrating modifications of the groove group 11 </ b> G in the wireless device 51.

  An electronic apparatus and an electroacoustic transducer according to an embodiment of the present invention will be described with reference to FIGS. 1 to 11 by a wireless device 51 of Example 1 and a portable speaker 51A of Example 2, respectively.

(Example 1)
FIG. 1 is a front view of a wireless device 51 as an electronic device. Here, the up, down, left, and right directions are defined by arrows in FIG. The front side is the front side of the page.

As shown in FIG. 1, the wireless device 51 includes an elongated casing 1 having a size that can be easily grasped by a hand.
A display unit 2, an operation unit 3, and a sound passing unit 6 are provided on the front surface of the housing 1. An antenna 4 and a volume control unit 5 are provided on the upper surface of the housing 1, and a transmission key 7 is provided on the upper side of the left side surface.
The display unit 2 displays information related to communication (channel number, volume, etc.). The operation unit 3 includes buttons that are operated by a user to operate the wireless device 51. The sound passing portion 6 has a sound passing hole group 61G in which a plurality of sound passing holes 61 are densely formed in a predetermined pattern.

In the housing 1, an electroacoustic transducer 62 is provided at a position corresponding to the sound hole group 61 </ b> G. Examples of the electroacoustic transducer 62 used in the wireless device 51 include a speaker unit and a microphone, and either one or both are provided at positions corresponding to the sound hole group 61G.
The wireless device 51 includes both a speaker unit and a microphone. For convenience, the microphone is not shown in each drawing, and only the speaker unit 13 (see FIG. 4) is described as an electroacoustic transducer. is there.

The wireless device 51 is used in a posture that corresponds to the direction shown in FIG.
When the user speaks to the sound passing part 6 while pressing the transmission key 7, the voice is picked up by a microphone (not shown) through the sound hole group 61G and transmitted to another wireless device. Further, when sound is received from another wireless device without the transmission key 7 being pressed, the sound is output from the speaker unit 13, and the sound is emitted to the outside through the sound hole group 61G. Listening is possible.

Next, the structure (sound passing structure TK) of the sound passing portion 6 will be described with reference to FIGS.
FIG. 2 is an enlarged view of the sound passing section 6 and its vicinity in FIG.
FIG. 3 is a perspective view of the sound passing portion 6 as viewed from the inner surface 1 a side of the housing 1.
FIG. 4 is a cross-sectional view taken along the S4-S4 position in FIG. 1 and is a view for explaining the sound passage structure TK that is the entire structure of the sound passage section 6. FIG.

As shown in FIG. 2, the sound passing portion 6 includes a sound passing hole group 61 </ b> G in which a plurality of sound passing holes 61 are provided in a predetermined pattern as described above.
In this example, the predetermined pattern is a square lattice pattern of 9 columns × 9 rows that is inclined in a posture in which the diagonal is in the vertical and horizontal directions. That is, in this pattern, the arrangement direction line LN61 indicating the arrangement direction of the sound holes 61 is inclined by 45 ° with respect to the central axis line CL1 extending in the vertical direction of the housing 1.

Among the plurality of sound passage holes 61, holes corresponding to one row extending vertically above the center position in the left-right direction are referred to as a central column hole 61a, and a group of the central column holes 61a is referred to as a central column hole group 61aG.
Of the plurality of sound holes 61, a hole provided on the left side of the central column hole group 61aG is a sound hole 61b, and a hole provided on the right side is a sound hole 61c. The left sound hole group 61bG and the sound hole 61c are referred to as a right sound hole group 61cG.
That is, the sound hole group 61G includes a central column hole group 61aG, a left sound hole group 61bG, and a right sound hole group 61cG.

On the other hand, as shown in FIG. 3, a groove group 11 </ b> G is formed on the inner surface 1 a side of the housing 1 as a group of a plurality of grooves 11.
The groove group 11G includes a central vertical groove 11a extending in the up-down direction at a central position in the left-right direction, and a lower horizontal groove 11d connected to the lower end of the central vertical groove 11a and extending in the left-right direction. The groove group 11G has a right end connected to the central vertical groove 11a or the lower horizontal groove 11d, a plurality of left inclined grooves 11b extending obliquely upward 45 ° to the left, and a left end portion of the central vertical groove 11a or the lower horizontal groove. 11d, and a plurality of left inclined grooves 11c extending obliquely upward and 45 ° to the right.

  A group of the plurality of left inclined grooves 11b is a left inclined groove group 11bG, and a group of the plurality of right inclined grooves 11c is a right inclined groove group 11cG. Further, the left inclined groove group 11bG and the right inclined groove group 11cG are combined to form an inclined groove group 11bcG.

On the rear side of all the central vertical holes 61a in the sound passage hole group 61G, at least a part of the cross-sectional shape is open to the central vertical groove 11a.
Further, the plurality of left inclined grooves 11b are formed with a vertical pitch or the like so that at least a part of the cross-sectional shape on the rear side of all the sound holes 61b is opened.
Further, the plurality of right inclined grooves 11c are formed with a vertical pitch or the like set so that at least a part of the cross-sectional shape on the rear side of all the sound holes 61c is opened.

  As shown in FIGS. 2 and 3, the sound hole 61b1 located at the bottom of the left sound hole group 61bG and the sound hole 61c1 located at the bottom of the right sound hole group 61cG have a cross-sectional shape. The entire range is open to the lower lateral groove 11d (fully open).

As shown in FIGS. 3 and 4, the groove forming portion 1 a 1 including a portion where the groove group 11 </ b> G is formed on the inner surface 1 a of the housing 1 protrudes in a circular shape toward the rear side (inner side).
Further, the protruding amount of the groove forming portion 1a1 increases as it goes upward.
That is, the groove forming portion 1a1 has a pedestal surface 1a2 that is inclined so that the upper side protrudes rearward.
Thereby, in the sound hole group 61G, the length of the sound hole 61 on the lower edge side is shorter than the length of the sound hole 61 at the center at least.

As shown in FIG. 4, the seat assembly 12 is affixed to the pedestal surface 1a2. Furthermore, the speaker unit 13 is attached to the pedestal surface 1a2 with the packing 14 interposed between the flange portion 13a and the pedestal surface 1a2.
The speaker unit 13 is, for example, a dynamic electroacoustic transducer, and a diaphragm 13c to which a voice coil bobbin 13b is attached is attached to a frame 13d via an edge (not shown).

5A and 5B are views showing the sheet assembly 12, in which FIG. 5A is a plan view, and FIG. 5B is a cross-sectional view at a position S5b-S5b in the plan view.
6A and 6B are views showing the packing 14, wherein FIG. 6A is a plan view and FIG. 6B is a cross-sectional view at a position S6b-S6b in the plan view.

As shown in FIG. 5, the sheet assembly 12 includes a sheet 12 a that has a filter function that allows air to pass therethrough and blocks dust from passing therethrough and hardly allows water to pass therethrough, and a double-sided pressure-sensitive adhesive sheet 12 b that is affixed to one surface thereof. It is configured.
The sheet 12a is a circular sheet, and the double-sided pressure-sensitive adhesive sheet 12b has an opening 12b1 in which a shape corresponding to the groove group 11G is removed.
As a result, the sheet assembly 12 is air permeable because the sheet 12a is exposed in the opening 12b1 of the double-sided pressure-sensitive adhesive sheet 12b.
The sheet assembly 12 is affixed to the pedestal surface 1a2 of the housing 1 with the groove 11G and the opening 12b1 matched.

As shown in FIG. 6, the packing 14 is a sealing member having a circular outer shape and having an opening 14 a that includes the sound hole group 61 </ b> G. The packing 14 has elasticity in the compression direction and is made of, for example, rubber.
The packing 14 has double ribs: an inner frame rib 14b that protrudes to one side at the edge of the opening 14a, and an outer frame rib 14c that protrudes to one side provided on the outer side.

  As described above, the speaker unit 13 is attached to the pedestal surface 1a2 with the packing 14 having the inner frame rib 14b and the outer frame rib 14c interposed therebetween. In this attached state, the inner frame rib 14b of the packing 14 is compressed to form a waterproof line, and the interior of the housing 1 with respect to the front space Vf of the speaker unit 13 including the space outside the housing 1 (see FIG. 4). The rear space Vb (see FIG. 4) of the speaker unit 13 is maintained in a watertight state.

When the wireless device 51 having the above configuration is used in, for example, rain, rainwater enters inside through the sound hole 61 (solid arrow) as shown in FIG.
The rainwater that has entered passes through the groove 11 and hardly passes through the speaker unit 13 due to the filter function of the seat 12a of the seat assembly 12.
On the other hand, as indicated by the solid line arrow in FIG. 7, the rainwater that has entered the inclined groove group 11bcG has both the left inclined groove 11b and the right inclined groove 11c inclined low on the central vertical groove 11a side. It reaches the groove 11a and descends in the central vertical groove 11a to reach the lower horizontal groove 11d. Further, rainwater directly entering the central vertical groove 11a also descends in the central vertical groove 11a due to its own weight and reaches the lower horizontal groove 11d.

  Since all of the sound holes 61 are open to the groove group 11G, most of the rainwater that has passed through the sound holes 61 gathers toward the lower lateral groove 11d by its own weight.

As described above, the sound passage hole 61b1 and the sound passage hole 61c1 are opened in the lower lateral groove 11d. Therefore, rainwater collected in the lower lateral groove 11d is discharged to the outside through the sound hole 61a1 (see FIGS. 2 and 4), the sound hole 61b1, and the sound hole 61c1 (FIGS. 7 and 8: broken line). Arrow).
That is, the sound holes 61a1, 61b1, 61c1 function as water discharge holes.

If the amount of rainwater entering from the sound hole 61 increases rapidly, the amount of rainwater entering may be larger than the amount of rainwater discharged in a short period of time.
In this case, a small amount of water that has passed through the seat 12a may be stored for a short time as the stored water Q in the lower part of the front space Vc between the inner surface 1a of the housing 1 and the speaker unit 13 in the front space Vf. .
However, as the amount of the stored water Q increases, discharge from the sound holes 61a1, 61b1, 61c1 is promoted by its own weight.

Furthermore, the pedestal surface 1a2 is an inclined surface that goes forward as it goes downward. That is, rainwater approaches the sound holes 61a1, 61b1, 61c1 to be discharged as it flows downward through the groove group 11G.
Thereby, even if rainwater enters the housing 1 from the sound hole 61, the wireless device 51 is discharged from the sound holes 61a1, 61b1, 61c1 below the sound hole group 61G to the outside.

In this way, the wireless device 51 can pass sound well inside and outside the housing 1 by providing a large number of sound passage holes 61 to increase the total opening area and using the air-permeable sheet 12a. it can. Furthermore, even when water enters through the sound hole 61 of the housing 1, the drainage of the water that has entered through the groove group 11G and the sheet 12a is promoted.
Therefore, the volume of sound emitted from the speaker unit 13 to the outside through the housing 1 and sound collected from the external space through the housing 1 by the internal microphone is difficult to decrease, and the sound quality is also difficult to change. Sound that passes through the housing.

(Example 2)
A portable speaker 51A as an electroacoustic transducer of Example 2 is rectangular in front view as shown in FIG. 9, and has a thin flat hexahedron shape in front and rear. For convenience of explanation, each of the upper, lower, left and right directions is defined by the arrow direction in FIG. The front is the front side of the page.

The portable speaker 51A includes the same speaker unit 13 as that of the first embodiment inside the housing 1A, and further includes an amplifier unit (not shown) that drives the speaker unit 13 and a receiving unit that receives an audio signal from the outside in a wired or wireless manner ( (Not shown).
As a result, an audio signal supplied from the outside is output as a sound from a speaker unit that is an electroacoustic transducer, and is emitted to the outside through the sound passing portion 6A provided in the housing 1A.
The portable speaker 51A is not limited to the one shown in FIG. 9, and can be used in four postures with the top, bottom, left, and right sides shown in FIG. Recommended.

FIG. 9 is a front view of the portable speaker 51A, FIG. 10 is a perspective view of the portion corresponding to the sound passing portion 6A of the housing 1A as seen from the rear left obliquely lower side, and FIG. 11 is S11 in FIG. It is sectional drawing in position -S11, and is a figure for demonstrating the sound transmission structure TKA which is the whole structure of the sound transmission part 6A.
9 to 11 correspond to FIGS. 2 to 4 in the first embodiment, respectively.

As shown in FIG. 9, the sound passing portion 6A has a sound passing hole group 71G in which a plurality of sound passing holes 71 are provided in a predetermined pattern.
In this example, the predetermined pattern is obtained by inclining a square grid pattern of 9 rows × 9 columns into a posture in which the diagonal is vertically and horizontally. That is, in this pattern, the arrangement direction line LN71 indicating the arrangement direction of the sound holes 71 is inclined by 45 ° with respect to the central axis CL1A of the casing 1 extending in the vertical direction.

  In the sound hole group 71G, a hole corresponding to a cross arrangement composed of a row extending vertically from the left and right center position and a row extending right and left from the upper and lower center position is referred to as a cross array hole 71a. A group of a plurality of cross array holes 71a is defined as a cross array hole group 71aG.

Further, among the plurality of sound holes 71, a hole in the upper left triangular region with respect to the cross array hole group 71aG is defined as a sound hole 71b, and a group of the plurality of sound holes 71b is defined as a sound hole group 71bG.
In addition, among the plurality of sound holes 71, a hole in the lower left triangular region with respect to the cross array hole group 71aG is defined as a sound hole 71c, and a group of the plurality of sound holes 71c is defined as a sound hole group 71cG.
Of the plurality of sound holes 71, a hole in the lower right triangular region with respect to the cross array hole group 71aG is defined as a sound hole 71d, and a group of the plurality of sound holes 71d is defined as a sound hole group 71dG.
Further, among the plurality of sound holes 71, a hole in the upper right triangular region with respect to the cross array hole group 71aG is defined as a sound hole 71e, and a group of the plurality of sound holes 71e is defined as a sound hole group 71eG.

As shown in FIG. 10, a groove group 21 </ b> G is formed as a group of a plurality of grooves 21 on the inner surface 1 </ b> Aa side of the housing 1 </ b> A.
The groove group 21G includes a cross-shaped cross groove 21a formed of a vertical groove extending vertically at the left and right central position and a horizontal groove extending left and right at the vertical center position, and formed so that the cross array hole group 71aG is opened on the bottom surface.
End grooves 21f3 and 21f1 extending in the left-right direction are respectively formed at the upper and lower ends of the vertical groove of the cross groove 21a. End grooves extending in the vertical direction are respectively formed at the left and right ends of the horizontal groove of the cross groove 21a. 21f4 and 21f2 are formed.

The groove group 21G includes inclined groove groups 21bG to 21eG whose both ends are connected obliquely (for example, at 45 °) to the vertical and horizontal grooves of the cross groove 21a.
The inclined groove group 21bG has a plurality of grooves 21b formed in parallel corresponding to the arrangement of the sound holes 71b.
The inclined groove group 21cG has a plurality of grooves 21c formed in parallel corresponding to the arrangement of the sound holes 71c.
The inclined groove group 21dG has a plurality of grooves 21d formed in parallel corresponding to the arrangement of the sound holes 71d.
The inclined groove group 21eG has a plurality of grooves 21e formed in parallel corresponding to the arrangement of the sound holes 71e.
In this example, four grooves 21b to 21e are formed.

In the sound hole group 71G, the sound holes 71b1 and 71e2 near the upper vertex are fully opened in the end groove 21f3, and the sound holes 71c2 and 71d1 near the lower vertex are fully opened in the end groove 21f1.
The sound holes 71b2 and 71c1 in the vicinity of the left apex are fully opened in the end groove 21f4, and the sound holes 71d2 and 71e1 in the vicinity of the right apex are fully opened in the end groove 21f2.

As shown in FIG. 11, the bottom surface 21 a 1 of the vertical groove extending vertically from the cross groove 21 a has the center in the vertical direction at the rearmost side and the plate thickness of the housing 1 A is thick, and as the distance from the center increases and decreases, It is formed as a surface that is inclined forward and the casing 1A becomes thinner. Similarly, the horizontal groove extending in the left-right direction is the same, and the center is at the rearmost side.
Thereby, in the sound hole group 71G, at least the length of the sound hole 71 on the edge side is shorter than the length of the sound hole 71 at the center.

On the other hand, in the inner surface 1Aa of the housing 1A, a circular range including a region where the groove group 21G is formed is a seat portion 1Aa1 that is slightly recessed with respect to the surroundings.
As shown in FIG. 11, the surface 1Aa2 of the seat 1Aa1 is flat, and a sheet assembly 12A corresponding to the sheet assembly 12 described in the first embodiment is attached to the surface 1Aa2.

Similar to the sheet assembly 12, the sheet assembly 12 </ b> A is obtained by laminating a double-sided adhesive sheet and a sheet. And the double-sided adhesive sheet has the opening part extracted by the shape corresponding to the groove group 21G.
The seat assembly 12A is pasted so that the opening and the groove group 21G coincide with each other. Therefore, a portion corresponding to the groove group 21G can be vented to the rear side through the seat of the sheet assembly 12A. .

With this configuration, in any of the four postures of the portable speaker 51A, any one of the end grooves 21f1 to 21f4 extends in the horizontal direction in the vertical lower portion of the groove group 21G. Here, for example, it is assumed that the end groove 21f4 on the right side in FIG.
In this posture, when the portable speaker 51A is used in the rain, rainwater that has entered from the sound hole 71 passes through one of the cross groove 21a and the inclined groove groups 21bG, 21cG, 21dG, and 21eG, and the end groove due to its own weight. Gather toward 21f4.
Since the sound hole 71b2 and the sound hole 71c1 are connected to the end groove 21f4 in a fully open state, the rainwater collected in the end groove 21f4 passes through the sound hole 71a1 (see FIGS. 9 and 11). It is smoothly discharged to the outside through the holes 71b2 and 71c1.

Further, the cross groove 21a and the inclined groove groups 21bG, 21cG, 21dG, and 21eG are closed from the rear side by a seat portion having at least air permeability and dust resistance of the seat assembly 12A.
Therefore, the rainwater that has passed through the sound passage hole 71 is difficult to pass through the sheet portion, and most of the rainwater is discharged to the outside through the sound passage holes 71a1, 71b2, and 71c1.
The drainage of rainwater that has entered the inside through the sound hole 71 is similarly performed in the other three postures of the portable speaker 51A.

The portable speaker 51A can be used in a plurality of recommended usage postures.
Even if the portable speaker 51A is used in an environment where water can enter from the sound hole 71, such as in the rain, the water that has entered the inside through the sound hole 71 is discharged to the outside in any use posture. The Therefore, the portable speaker 51 </ b> A can pass sound well inside and outside the housing 1 </ b> A by providing a large number of sound passage holes 71 to increase the total opening area and using the sheet assembly 12 </ b> A. Further, even when water enters from the sound passage hole 71 of the housing 1A, the drainage of the intruded water is promoted by the groove group 21G and the sheet assembly 12A.
Therefore, the volume of sound emitted from the speaker unit 13 to the outside through the housing 1A is difficult to decrease, the sound quality is hardly changed, and a good housing sound can be obtained.

  The first and second embodiments described in detail above are not limited to the above-described configuration, and may be modified in a range not departing from the gist of the present invention.

The wireless device 51 may be transformed into the sound transmitting unit 6B by changing the structure of the sound transmitting unit 6 to be a wireless device 51B. Hereinafter, the structure (sound passing structure TKB) of the sound passing portion 6B will be described with reference to FIGS.
FIG. 12 is an enlarged view of the sound passing portion 6B and the vicinity thereof.
FIG. 13 is a perspective view of the sound passing portion 6B as viewed from the inner surface 1Ba side of the housing 1B.
FIG. 14 is a cross-sectional view at the position S14-S14 in FIG. 12, and is a view for explaining the sound passing structure TKB that is the entire structure of the sound passing portion 6B.

  As shown in FIG. 12, the sound passing portion 6B provided in the casing 1B of the wireless device 51B has sound passing holes 81 arranged vertically and horizontally in a square range diagonally in the vertical direction and the horizontal direction. A through hole group 81G formed in a square lattice shape. However, in the sound hole group 81G, the sound hole 81 corresponding to the vertex is not formed except for the lower vertex among the top, bottom, left and right vertices.

As shown in FIG. 13, a groove group 31G formed by connecting a plurality of grooves is formed in a portion corresponding to the sound passing portion 6B on the inner surface 1Ba of the housing 1B.
The groove group 31G includes a central vertical groove 31a that extends vertically at the center in the left-right direction, a left horizontal groove group 31bG, and a right horizontal groove group 31cG.
An upper horizontal groove 31e is connected to the upper end of the central vertical groove 31a, and a lower horizontal groove 31d is connected to the lower end.

The left lateral groove group 31bG is composed of a plurality of left lateral grooves 31b whose right end is connected to the central longitudinal groove 31a, extends horizontally to the left, and is arranged in parallel in the vertical direction.
The right lateral groove group 31cG is composed of a plurality of right lateral grooves 31c whose left end is connected to the central longitudinal groove 31a, extends horizontally to the right, and is arranged in parallel in the vertical direction.

All the sound holes 81 are opened in any one of the central vertical groove 31a, the left horizontal groove 31b, and the right horizontal groove 31c. In the patterns shown in FIGS. 12 and 13, the sound holes 81 are open in grooves other than the central longitudinal groove 31a.
Further, the sound passage holes 81a1, 81a2, 81a3 at the lower part of the sound passage portion 6B are opened in the lower lateral groove 31d.

As shown in FIGS. 13 and 14, in the inner surface 1Ba of the housing 1B, a circular range including a region where the groove group 31G is formed is a seat portion 1Ba1 that is slightly recessed with respect to the surroundings.
The surface 1Ba2 of the seat portion 1Ba1 is flat, and a sheet assembly 12B corresponding to the sheet assembly 12 is attached to the surface 1Ba2.
In the sheet assembly 12B, the opening shape of the double-sided pressure-sensitive adhesive sheet corresponds to the shape of the groove group 31G, and the opening is pasted so as to match the groove group 31G. Therefore, a portion corresponding to the groove group 31G can be vented to the rear side through the seat of the seat assembly 12B.

In the wireless device 51B of this modification, water that has entered from the outside through the sound hole 81 due to use in the rain in the posture shown in FIG. 12 enters the left lateral groove group 31bG or the right lateral groove group 31cG and is stored.
Part of the water accumulated in the left lateral groove group 31bG and the right lateral groove group 31cG moves downward by its own weight through the central longitudinal groove 31a to which these groove groups are connected, and reaches the lower lateral groove 31d.

On the other hand, when a certain amount of water accumulates in the left lateral groove group 31bG and the right lateral groove group 31cG, and passes through the seat of the seat assembly 12B, the immediately preceding space Vc between the seat assembly 12 and the speaker unit 13 (see FIG. 14). Enter. Then, it travels down along the rear surface of the seat assembly 12 due to its own weight (FIG. 14: solid line arrow) and reaches and accumulates in the lower lateral groove 31d.
The water accumulated in the lower lateral groove 31d passes through the sound holes 81a1, 81a2, 81a3 opened in the lower lateral groove 31d and is discharged to the outside (FIG. 14: broken line arrows).

In this way, the wireless device 51B can pass sound well inside and outside the housing 1B by providing a large number of sound holes 81 to increase the total opening area and using the air-permeable sheet 12B. it can. Furthermore, even when water enters from the sound passage hole 81 of the housing 1B, the drainage of the intruded water is promoted by the groove group 31G and the sheet assembly 12B.
Therefore, the sound emitted from the speaker unit 13 through the housing 1B to the outside, and the sound volume collected by the internal microphone from the external space through the housing 1B when the microphone is provided is as follows. It is difficult to decrease and the sound quality is hardly changed, and a good case passing sound can be obtained.

The formation mode of the sound passing portions 6, 6 </ b> A, 6 </ b> B is not limited to that mode, and can be modified to various modes.
For example, you may deform | transform like Fig.15 (a)-(g).
(A) is the sound passing part 6Va of the aspect which extends the center vertical groove 11a below with respect to the groove group 11G, and induces water to the extended part.
(B) is a sound passing portion 6Vb in which a plurality of vertical grooves are juxtaposed in the left-right direction, the central vertical groove is extended downward, and water is guided to the extended portion.
(C) is a sound passing portion 6Vc in which the central longitudinal groove is inclined with respect to the groove group 31G.
(D) is a sound passing portion 6Vd in a mode in which vertical grooves are provided on the left and right of the central vertical groove with respect to the groove group 31G and water is guided to the lower portions of all the central vertical grooves.
(E) is a sound passing portion 6Ve in which a longitudinal groove is provided in parallel to the left and right of the central longitudinal groove with respect to the groove group 31G, and only the central longitudinal groove is extended downward to guide water to the extended portion. .
(F) is a sound passing portion 6Vf in which the central vertical groove is deleted from the groove group 31G and the vertical grooves are provided at both left and right ends.
(G) is the sound passing portion 6Vg in a mode in which the sound holes of the lateral grooves are horizontally long holes with respect to the groove group 31G.
Each aspect can be combined suitably.

The electronic device is not limited to the wireless devices 51 and 51B described as the first embodiment and the modified example, and various devices such as a mobile terminal including a mobile phone, a music playback device, and a game machine are applicable.
The electroacoustic transducer is not limited to the one having only the speaker unit 13 like the portable speaker 51A described as the second embodiment, and has only the microphone, or both the speaker unit 13 and the microphone unit. Various devices such as the ones are applicable.

1, 1A, 1B Housing 1a, 1Aa, 1Ba Inner surface, 1a1 Groove formation part, 1a2 Base surface 1Aa1, 1Ba1 Seat part, 1Aa2, 1Ba2 Surface 2 Display part 3 Operation part 4 Antenna 5 Volume adjustment part 6, 6A, 6B, 6Va to 6Vg Sound passing portion 7 Transmission key 11 groove, 11G groove group 11a Center vertical groove, 11b Left inclined groove, 11c Right inclined groove 11d Lower horizontal groove, 11bcG inclined groove group 11bG Left inclined groove group, 11cG Right inclined groove group 12, 12A, 12B sheet assembly 12a sheet, 12b double-sided adhesive sheet, 12b1 opening 13 speaker unit (electroacoustic transducer)
13a flange portion, 13b voice coil bobbin, 13c diaphragm 13d frame 14 packing 14a opening, 14b inner frame rib, 14c outer frame ribs 21, 21b, 21c, 21d, 21e groove, 21G groove group 21a cross groove, 21a1 bottom surface 21bG, 21cG, 21dG, 21eG Inclined groove group 21f1, 21f3, 21f2, 21f4 End groove 31a Central longitudinal groove, 31b Left lateral groove, 31bG Left lateral groove group 31c Right lateral groove, 31cG Right lateral groove group, 31d Lower lateral groove 31e Upper lateral groove, 31G groove group 51,51B Radio (electronic equipment)
51A Portable speaker (electroacoustic transducer)
61 sound hole, 61G sound hole group 61a center column hole, 61aG center column hole group 61b, 61b1, 61c, 61c1 sound hole, 61bG left sound hole group 61cG right sound hole group 62 electroacoustic transducer 71, 71b, 71c, 71d, 71b1, 71b2, 71c1, 71c2,
71d1, 71d2, 71e1, 71e2 Sound hole 71bG, 71cG, 71dG, 71eG Sound hole group 71a Cross array hole, 71aG Cross array hole group, 71G Sound hole group 81, 81a1, 81a2, 81a3 Sound hole, 81G Sound hole group CL1, CL1A Center axis line, LN61, LN71 Alignment direction line Q Reserved water TK, TKA, TKB Sound transmission structure Vb Rear space, Vc Immediate space, Vf Front space

Claims (7)

A housing that can accommodate an electroacoustic transducer inside and has a sound passage group consisting of a plurality of sound passage holes;
A breathable sheet;
With
The housing includes a plurality of first grooves extending in one direction and one end side connected to the first grooves at a position corresponding to the sound hole group on the inner surface thereof. A groove group including a second groove;
The groove group is located between the sound hole group and the sheet;
The sound transmission structure of the housing characterized by.   2. The sound passage structure for a housing according to claim 1, wherein the second groove includes a groove extending obliquely toward one side in the one direction with respect to the first groove.   The bottom surfaces of the first groove and the second groove are inclined so as to shorten the length of the sound hole formed on the edge side of the sound hole in the center of the sound hole group. The sound transmission structure of the housing according to claim 1 or 2.   In a posture in which the one direction is a vertical direction, water can enter one of the first groove and the second groove from the outside of the housing through the sound hole, and the one The water that has entered the groove is configured to move between the one groove and the sheet and be discharged to the outside through the sound hole from the lower portion of the first groove. Item 4. The sound transmission structure of the housing according to any one of items 1 to 3. An electroacoustic transducer;
While housing the electroacoustic transducer inside, a housing having a sound passage hole group consisting of a plurality of sound passage holes,
A breathable sheet;
With
The housing includes a plurality of first grooves extending in one direction and one end side connected to the first grooves at a position corresponding to the sound hole group on the inner surface thereof. A groove group including a second groove;
The groove group is located between the sound hole group and the sheet;
An electroacoustic transducer characterized by the above.   The electroacoustic transducer according to claim 5, wherein the one direction is a direction along a vertical direction in a use posture of the electroacoustic transducer. A housing having a group of sound holes made of a plurality of sound holes;
An electroacoustic transducer housed inside the housing;
A display unit provided in the housing so as to be visible from the outside;
A breathable sheet;
With
The housing includes a plurality of first grooves extending in one direction and one end side connected to the first grooves at a position corresponding to the sound hole group on the inner surface thereof. A groove group including a second groove;
The groove group is located between the sound hole group and the sheet;
Electronic equipment characterized by

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