Case structure

Abstract

To provide a structure which suppresses sound leakage from a case for housing a speaker unit.SOLUTION: Disclosed is a case structure 100 of a case 3 for housing a speaker unit 2. The case 3 has an upper case 4 and a lower case 5 which are assemble to each other in a straight line Lz direction. In the upper case 4, an opening 45 which brings the inside and the outside of a peripheral wall part 41 into communication with each other is formed, over to a bonding surface to the lower case 5, on the peripheral wall part 41 covering the speaker unit 2. The lower case 5 has a protruding wall 533 which protrudes in the straight line Lz direction so as to close the opening 45 when the lower case 5 is assembled to the upper case 4. Peripheral parts 46 and 47 of the opening 45 are provided with recessed grooves 6A and 6B into which fitting walls 7A and 7B, i.e., peripheral parts of the protruding wall 533, are inserted.SELECTED DRAWING: Figure 16

Description

Technical Field

[0001] The present invention relates to a case structure.

Background Art

[0002] Patent Document 1 discloses a speaker device having a speaker unit and a case for housing the speaker unit.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The case for housing the speaker unit may be formed by combining a plurality of housings. In this case, there is a risk that the sound emitted from the speaker unit leaks through the gaps between the housings, affecting the sound perceived by the user.

[0005] Therefore, there is a need to provide a case structure that can suppress sound leakage from the case for housing the speaker unit. Note that, not limited to such requirements, the actions and effects derived from each configuration disclosed in the "Mode for Carrying Out the Invention" described later, which are actions and effects not achievable by the conventional technology, can also be positioned as other objects of the present case.

Means for Solving the Problems

[0006] The present invention is a case structure of a case for housing a speaker unit, wherein the case has a first housing and a second housing that are assembled to each other in a first direction, In the first housing, a first opening that communicates the inside and the outside of the wall portion covering the speaker unit is formed up to the joint surface with the second housing. The second housing has a protruding wall that protrudes in the first direction so as to close the first opening when the second housing is assembled to the first housing. A case structure is provided in which a concave groove into which the other peripheral edge is inserted is provided in one of the peripheral edge of the protruding wall and the peripheral edge of the first opening.

Advantages of the Invention

[0007] According to the present invention, it is possible to provide a case structure that can suppress sound leakage from a case that houses a speaker unit.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Mode for Carrying Out the Invention

[0009] In the present embodiment, the case structure 100 is adopted as an example to explain the speaker unit 1 provided in the switch device 9 for a vehicle. The switch device 9 can be arranged, for example, on the instrument panel of the vehicle. FIG. 1 is a diagram for explaining the switch device 9. FIG. 1 is a perspective view of the switch device 9 as viewed from the user side. FIG. 2 is a diagram for explaining the switch device 9. FIG. 2 is an exploded perspective view of the switch device 9 as viewed from the speaker unit 1 side. In the enlarged view of FIG. 2, only the upper case 4 is shown, omitting the illustration of the lower case 5 in the speaker unit 1. FIG. 3 is a diagram for explaining the arrangement of the speaker unit 1 on the rear cover 92. (A) of FIG. 3 is a plan view schematically showing an enlarged area where the speaker unit 1 is provided in the upper case 4. (B) of FIG. 3 is a diagram showing the area around the upper case 4 before assembly, with the lower case 5 assembled to the upper case 4 arranged at a position separated from the upper case 4. FIG. 4 is a schematic cross-sectional view of the switch device 9. In FIG. 4, a cross-section of the switch device 9 cut along the line A-A in (A) of FIG. 3 is shown together with other components of the switch device 9. FIG. 5 is a schematic cross-sectional view of the switch device 9. (A) of FIG. 5 is a diagram schematically showing a cross-section of the speaker unit 1 cut along the line A-A in FIG. 4. (B) of FIG. 5 is a diagram schematically showing a cross-section of the speaker unit 1 cut along the line B-B in FIG. 4. In addition, in FIGS. 4 and 5, the illustration of the speaker unit 2 is omitted, and the area where the speaker unit 2 is arranged is indicated by a virtual line.

[0010] In the following description, when explaining the positional relationship of the components of the speaker unit 1, the XYZ directions (see FIG. 1 etc.) are used as a reference. The X direction is generally along the vehicle width direction, the Y direction is along the vehicle longitudinal direction, and the Z direction is along the up and down direction, but they do not necessarily have to be completely parallel. Also, as necessary, the terms "front side of the vehicle" and "rear side of the vehicle" may be used with reference to the Y direction. Further, with reference to the Z direction, the terms "upper side" or "above" and "lower side" or "below" may be used.

[0011] As shown in FIG. 1, the switch device 9 includes a plurality of switches SW. The switch SW is used for the user to operate various in-vehicle devices such as an air conditioner, an audio device, and a car navigation device. The switch SW can be, for example, a capacitive touch sensor.

[0012] The switch device 9 includes the speaker unit 1 on the front side in the Y direction (second direction). In a state where the switch device 9 is arranged on the instrument panel, the switch SW is exposed in the vehicle cabin VR, and the speaker unit 1 is provided at a position where it is not exposed in the vehicle cabin VR. The speaker unit 1 outputs a notification sound or the like for notifying the operation of the switch SW when the switch SW is operated.

[0013] The switch device 9 has an operation panel 91 provided with the switch SW and a rear cover 92 (third housing) connected to the operation panel 91 from the front side in the Y direction. The speaker unit 1 is provided on the rear cover 92 of the switch device 9.

[0014] As shown in FIG. 2, the switch device 9 has a basic configuration in which an intermediate case 93 and a printed circuit board 94 are accommodated between an operation panel 91 and a rear cover 92. In the switch device 9, the operation panel 91, the intermediate case 93, the printed circuit board 94, and the rear cover 92 are arranged in this order in the assembling direction of the rear cover 92 with respect to the operation panel 91 (Y direction in the figure).

[0015] As shown in FIG. 1, on the surface 91a of the operation panel 91 exposed to the vehicle interior VR, marks Mk indicating the respective functions of the switches SW are displayed. Examples of the marks Mk include those indicating the ON / OFF of the air conditioner, outside air introduction, internal air circulation, and seat heater.

[0016] As shown in FIG. 2, six bolt bosses 911 (911a to 911f) are provided on the back surface 91b of the operation panel 91. The six bolt bosses 911 (911a to 911f) protrude in a direction away from the back surface 91b. The six bolt bosses 911 (911a to 911f) are provided at intervals in the longitudinal direction (X direction) of the operation panel 91.

[0017] Also, a sheet-like electrostatic sensor S is attached to the back surface 91b of the operation panel 91 (see FIG. 4). The electrostatic sensor S has sensor portions that correspond one-to-one to the respective switches SW (see FIG. 1) of the operation panel 91. The electrostatic sensor S is electrically connected to the connector portion C1 of the printed circuit board 94 via a wiring Sa.

[0018] The intermediate case 93 has a belt-shaped base portion 930 and a peripheral wall portion 932 that surrounds the outer periphery of the base portion 930 over the entire circumference. The base portion 930 is provided in a direction along the X direction. Through holes 931 are provided in the base portion 930 at positions overlapping the bolt bosses 911 (911a to 911f) of the operation panel 91 when viewed from the Y direction. The same number of through holes 931 as the bolt bosses 911 are provided.

[0019] When viewed from the intermediate case 93, on the side opposite to the operation panel 91 in the Y direction, a strip-shaped printed circuit board 94 is provided. The printed circuit board 94 is provided in a direction along the X direction. When viewed from the Y direction, the printed circuit board 94 is provided with a through hole 941 at a position overlapping the bolt boss 911 of the operation panel 91 described above and the through hole 931 of the intermediate case 93. The number of through holes 931 provided is the same as the number of bolt bosses 911.

[0020] On the opposing surface 94b of the printed circuit board 94 to the rear cover 92 in the Y direction, three connector portions C1, C2, and C3 are provided. The wiring Sa of the electrostatic sensor S is electrically connected to the connector portion C1. The wiring Sb (see FIG. 6) of the speaker unit 2 described later is electrically connected to the connector portion C2. A power supply line (not shown) is electrically connected to the connector portion C3.

[0021] Although not shown in the drawings, on the opposing surface 94a of the printed circuit board 94 to the intermediate case 93 in the Y direction, a light-emitting element (LED) is provided. The intermediate case 93 is provided with a lens for diffusing the light emitted from the light-emitting element. The light-emitting element and the lens are provided at positions overlapping the marks Mk (see FIG. 1) of the respective switches SW of the operation panel 91 when viewed from the straight line Y direction. Thereby, the user can visually recognize the lighting / extinguishing of the mark Mk of the operated switch SW.

[0022] As shown in FIG. 2, the rear cover 92 has a strip-shaped base portion 920. The rear cover 92 is provided in a direction with the base portion 920 along the X direction. As shown in FIG. 4, in the base portion 920, an upper case 4 which is a component of the speaker portion 1 is provided at a substantially central portion in the X direction. The upper case 4 and the base portion 920 are integrally formed resin components.

[0023] As shown in FIG. 2, six counterbore holes 921 (921a to 921f) are provided in the base 920 of the rear cover 92. The counterbore holes 921 (921a to 921f) are provided at intervals in the X direction. The number of counterbore holes 921 (921a to 921f) is the same as the number of the bolt bosses 911 described above.

[0024] In the rear cover 92, two counterbore holes 921a and 921b are located on one side (the upper left diagonal side in FIG. 2) when viewed from the upper case 4, and three counterbore holes 921d, 921e, and 921f are located on the other side (the lower right diagonal side in FIG. 2). The counterbore hole 921c (the second opening) is provided in a region overlapping the upper case 4 when viewed from the Y direction.

[0025] As shown in FIG. 4, when the rear cover 92 is assembled to the operation panel 91, the intermediate case 93 and the printed circuit board 94 are accommodated in a state of being sandwiched between the rear cover 92 and the operation panel 91. In this state, the bolt bosses 911 of the operation panel 91, the through holes 931 of the intermediate case 93, the through holes 941 of the printed circuit board 94, and the counterbore holes 921 of the rear cover 92 are arranged in an overlapping positional relationship.

[0026] Thereby, by screwing bolts B (Ba to Bf) inserted into the counterbore holes 921 of the rear cover 92 into the bolt bosses 911 on the operation panel 91 side, a housing of the switch device 9 in which the intermediate case 93 and the printed circuit board 94 are sandwiched between the operation panel 91 and the rear cover 92 is formed.

[0027] FIG. 6 is an exploded perspective view of the speaker unit 1. FIG. 7 is a schematic cross-sectional view of the speaker unit 1. FIG. 7(A) schematically shows a cross-section obtained by cutting around the speaker unit 1 along the line C-C in FIG. 4. FIG. 7(B) schematically shows a cross-section obtained by cutting around the speaker unit 1 along the line A-A in FIG. 7(A). FIG. 8 is a diagram for explaining the upper case 4. (A) of FIG. 8 is a perspective view of the upper case 4 as viewed from the lower side in the Z direction. In (A) of FIG. 8, the connector portion C2 provided on the printed circuit board 94 is shown by a phantom line. (B) of FIG. 8 is a plan view of the upper case 4 as viewed from the opening portion 45 side. FIG. 9 is a schematic cross-sectional view of the upper case 4. FIG. 9 schematically shows a cross-section of the upper case 4 cut along the line A-A in (B) of FIG. 8. FIG. 10 is a schematic cross-sectional view of the upper case 4. (A) of FIG. 10 schematically shows a cross-section of the upper case 4 cut along the line A-A in (A) of FIG. 9. (B) of FIG. 10 schematically shows a cross-section of the upper case 4 cut along A-A in (A) of FIG. 10. (C) of FIG. 10 schematically shows a cross-section with the lower case 5 superimposed on (B) of FIG. 10.

[0028] As shown in FIG. 6, the speaker unit 1 includes a speaker unit 2 and a case 3 that houses the speaker unit 2. The case 3 includes an upper case 4 (first housing) integrally formed with the rear cover 92, and a lower case 5 (second housing) detachably provided on the upper case 4.

[0029] The upper case 4 and the lower case 5 are joined to each other in the linear Lz direction (first direction) along the Z direction with the speaker unit 2 sandwiched therebetween. The speaker unit 2 is fixed to the upper case 4 by bolts B4. Also, a straight line Ly passing through the center of the counterbore 921c is a straight line along the Y direction. The straight lines Lz and Ly are orthogonal to each other.

[0030] (Upper case 4) As shown in FIG. 5, the upper case 4 has a peripheral wall portion 41 (wall portion) that surrounds the outer periphery of the speaker unit 2 and a bottom wall portion 42 that closes one opening of the peripheral wall portion 41. As shown in FIG. 6, the peripheral wall portion 41 is provided with an opening in a direction along the assembling direction (linear Lz direction) of the upper case 4 and the lower case 5. Here, the assembling direction of the upper case 4 and the lower case 5 is a direction orthogonal to the assembling direction (linear Ly direction) of the operation panel 91 and the back cover 92.

[0031] As shown in FIG. 9, when viewed from the linear Lz direction, the peripheral wall portion 41 forms a substantially rectangular shape surrounding the linear Lz. The peripheral wall portion 41 is formed in a cylindrical shape from a pair of side wall portions 411 and 412 provided at intervals in the X direction (left - right direction in the figure), a connecting wall portion 413 connecting the end portions on the tip side of the side wall portions 411 and 412, and a common wall portion 414 connecting the end portions on the base end side of the side wall portions 411 and 412. The common wall portion 414 is an area overlapping the upper case 4 at the base portion 920 of the back cover 92.

[0032] Here, in FIG. 9, the linear Lx is a straight line passing through the mid - points of the pair of side wall portions 411 and 412 along the X direction. The linear Ly is a straight line passing through the mid - points of the connecting wall portion 413 and the common wall portion 414 along the Y direction. The linear Lz is a straight line orthogonal to the linear Lx and the linear Ly.

[0033] The inside of the peripheral wall portion 41 is the accommodation space R for the speaker unit 2. Inside the peripheral wall portion 41, a seating portion 43 serving as the mounting surface for the speaker unit 2 is provided. The seating portion 43 is provided straddling the four corners of the substantially rectangular peripheral wall portion 41.

[0034] As shown in FIG. 9, in the X direction, the pair of side wall portions 411 and 412 are located on one side and the other side of the linear Ly. The side wall portions 411 and 412 are formed in a symmetrical shape at positions sandwiching the linear Ly.

[0035] In the side wall portions 411 and 412, recesses 416 and 416 are formed on the outer periphery at a position substantially in the middle in the longitudinal direction (up - down direction in the figure). The recesses 416 and 416 are grooves with a rectangular cross - section opening to the outer peripheral surfaces 411a and 412a of the side wall portions 411 and 412.

[0036] As shown in FIG. 5(A), the recesses 416, 416 have lengths L416, L416 extending to the lower end sides of the side wall portions 411, 412 in the straight line Lz direction. In the recesses 416, 416, engagement protrusions 417, 417 are provided at positions closer to the bottom wall portion 42 in the straight line Lz direction. As shown in FIG. 9, the engagement protrusions 417, 417 are located on the side of the connection wall portion 413 (upper side in the figure) rather than in the straight line Lx direction.

[0037] As shown in FIG. 5(B), the side wall portions 411, 412 each have a step portion 415, 415 at their lower ends in the straight line Lz direction. The step portion 415 has a first lower end surface 415a (bonding surface) and a second lower end surface 415b that are offset in the straight line Lz direction, and a step surface 415c that connects the first lower end surface 415a and the second lower end surface 415b. The first lower end surface 415a and the second lower end surface 415b are flat surfaces orthogonal to the straight line Lz. The step surface 415c is a flat surface parallel to the straight line Lz.

[0038] The first lower end surface 415a is connected to the outer peripheral surfaces 411a, 412a of the side wall portions 411, 412. The second lower end surface 415b is connected to the inner peripheral surfaces 411b, 412b of the side wall portions 411, 412. The second lower end surface 415b is located lower in the straight line Lz direction than the first lower end surface 415a.

[0039] Thereby, when the lower case 5 is joined to the upper case 4, the first lower end surface 415a of the side wall portion 412 abuts against the lower case 5. Also, the second lower end surface 415b side is configured to overlap the lower case 5 when viewed from the X direction. Thereby, since the upper case 4 and the lower case 5 constitute a seal structure at the boundary portion, the accommodation space R surrounded by the upper case 4 and the lower case 5 is less likely to communicate with the outside in the X direction.

[0040] As shown in FIG. 8, in the connection wall portion 413, recesses 418, 418 are formed on the outer periphery of the connection portions with the side wall portions 411, 412. As shown in FIG. 9, the recesses 418, 418 are grooves having a rectangular cross-section that open to the outer peripheral surfaces 411a, 412a of the side wall portions 411, 412 and the outer periphery 413a of the connection wall portion 413. As shown in FIG. 7(A), the recesses 418, 418 have a length L418 that extends to the end portion 413c on the lower case 5 side of the connection wall portion 413 in the straight line Lz direction. Engagement protrusions 419, 419 are provided in the recesses 418, 418

[0041] As shown in FIG. 9, in the connection wall portion 413, an opening 45 (first opening) is provided at a substantially central portion in the straight line Lx direction. The opening 45 penetrates the connection wall portion 413 in the thickness direction (vertical direction in the figure).

[0042] The connection wall portion 413 has peripheral portions 46, 47 having concave grooves 6A, 6B at the boundary with the opening 45. The peripheral portions 46, 47 have thicknesses W46, W47 in the straight line Ly direction and predetermined widths L46, L47 in the straight line Lx direction (left - right direction in the figure).

[0043] As shown in FIG. 8(B), the opening 45 is a region surrounded by a first side surface 451 which is the side surface on the opening 45 side of the peripheral portion 46, a second side surface 452 which is the side surface on the opening 45 side of the peripheral portion 47, and a third side surface 453 connecting the upper end portions of the first side surface 451 and the second side surface 452 The third side surface 453 is located above (upper side in the figure) the bottom surface 42a of the bottom wall portion 42 of the upper case 4 in the straight line Lz direction. Therefore, on the third side surface 453 side of the opening 45, the side surface 42c of the bottom wall portion 42 is exposed

[0044] As shown in the enlarged area of FIG. 9, when viewed from the direction of the straight line Lz, the first side surface 451 and the second side surface 452 of the opening 45 are flat surfaces parallel to the straight line Ly. The concave grooves 6A and 6B are recessed in a direction away from each other at substantially the central portions of the first side surface 451 and the second side surface 452 in the direction of the straight line Ly. The interval W2 between the concave grooves 6A and 6B in the X direction is wider than the interval W1 between the first side surface 451 and the second side surface 452 (W2>W1, see (B) of FIG. 8).

[0045] In the present embodiment, the concave grooves 6A and 6B are formed by utilizing the thicknesses of the peripheral portions 46 and 47. The concave grooves 6A and 6B have symmetrical shapes with the straight line Ly interposed therebetween. In the following description, the shape of the concave groove 6A will be described by taking the concave groove 6A as an example.

[0046] The concave groove 6A has a groove bottom 61 parallel to the straight line Ly, and groove walls 62 and 63 connecting both ends of the groove bottom 61 in the direction of the straight line Ly and the first side surface 451. The groove walls 62 and 63 are orthogonal to the groove bottom 61.

[0047] In the concave groove 6A, a rib 65 is provided on the groove wall 63 on the seating portion 43 side in the direction of the straight line Ly. The rib 65 has, for example, an arcuate shape with a vertex 65a facing the groove wall 62 side. In the concave groove 6A, the groove width W65 in the region where the rib 65 is provided is narrower than the groove width W6 in the region where the rib 65 is not provided (W65<W6).

[0048] As shown in FIG. 10(A), in the direction of the straight line Lz, the upper ends 6A1 and 6B1 of the concave grooves 6A and 6B are connected to the third side surface 453 of the opening 45. The lower ends of the concave grooves 6A and 6B reach the lower end surfaces 46a and 47a of the peripheral portions 46 and 47. That is, the concave grooves 6A and 6B are sealed at the upper side in the direction of the straight line Lz by the bottom wall portion 42, and the lower ends are open at the lower end surfaces 46a and 47a of the peripheral portions 46 and 47.

[0049] The rib 65 is a linear protrusion extending along the direction of the straight line Lz inside the concave grooves 6A and 6B. In the direction of the straight line Lz, the rib 65 is formed to have a length extending from the third side surface 453 of the opening 45 to the vicinity of the lower end surfaces 46a and 47a of the peripheral portions 46 and 47.

[0050] As shown in (B) of FIG. 10, on the lower end surface 47a side of the peripheral portion 47, there is a region with a height h65 where the rib 65 is not provided. In this region, the concave groove 6B has a wider opening area on the lower end surface 47a side of the peripheral portion 47 by the amount corresponding to the absence of the rib 65. This makes it easier to insert the fitting wall 7B (see (C) of FIG. 10) of the lower case 5 described later into the concave groove 6B, rather than making the lower end 65c of the rib 65 flush with the lower end surface 47a of the peripheral portion 47. Although not shown, the same applies to the rib 65 provided in the concave groove 6A.

[0051] Here, as shown in (B) of FIG. 8, on the back side of the opening 45 in the direction of the straight line Ly, the common wall portion 414 of the peripheral wall portion 41 and the above-described countersunk hole 921c are located. In the opening 45, the distance W1 between the first side surface 451 and the second side surface 452 in the X direction is set to be wider than the hole diameter D1 of the countersunk hole 921c (W1 > D1).

[0052] As shown in (A) of FIG. 8, the countersunk hole 921c of the back cover 92 is provided in the common wall portion 414. An opening window 923 is provided below the common wall portion 414. The opening window 923 communicates with the countersunk hole 921c via a communication passage 924. When viewed from the direction of the straight line Ly, the connector portion C2 (see the phantom line in the figure) provided on the printed circuit board 94 is exposed from the opening window 923. The wiring Sb (see FIG. 6) of the speaker unit 2 is connected from the opening window 923 to the connector portion C2 of the printed circuit board 94.

[0053] As shown in FIG. 4, a boss portion 925 surrounding the countersunk hole 921c is provided on the common wall portion 414. The boss portion 925 protrudes in the direction of the straight line Ly from the opposing surface 414a of the common wall portion 414 with respect to the printed circuit board 94. Also, on the opposing surface 414a of the common wall portion 414, engaging protrusions 928, 928 are provided on one side and the other side sandwiching the boss portion 925 in the X direction.

[0054] Here, as shown in FIG. 4, when fixing the back cover 92 to the operation panel 91 using the bolt B, a tool T (such as a driver, hexagon wrench, etc.) is used. The opening 45 of the connection wall portion 413 is provided to secure a space where the tool T can access in order to tighten the bolt Bc accommodated in the countersunk hole 921c.

[0055] (Lower case 5) FIG. 11 is a view for explaining the lower case 5. (A) of FIG. 11 is a perspective view of the lower case 5 seen from the upper side in the Z direction. (B) of FIG. 11 is a plan view of the lower case 5. FIG. 12 is a view for explaining the lower case 5. (A) of FIG. 12 is a schematic view of the A - A cross section of (B) of FIG. 11. (B) of FIG. 12 is a view seen in the direction of the arrow A - A of (A) of FIG. 12. Note that in (B) of FIG. 12, in order to make the shape easier to understand, the side wall portion 53 is hatched. FIG. 13 is a view for explaining the protruding wall 533. FIG. 13 is a schematic view of the A - A cross section of (B) of FIG. 12. FIG. 14 is a view for explaining the joining of the upper case 4 and the lower case 5. (A) of FIG. 14 is a perspective view of the case 3 seen from the lower side in the Z direction. (B) of FIG. 14 is a view seen in the direction of the arrow A - A of (A) of FIG. 14.

[0056] As shown in FIG. 11(A), the lower case 5 has a bottom wall portion 50 orthogonal to the straight line Lz, and a peripheral wall portion 55 surrounding the outer periphery of the bottom wall portion 50. The peripheral wall portion 55 protrudes upward in the direction of the straight line Lz from the bottom wall portion 50.

[0057] As shown in FIG. 11(B), the bottom wall portion 50 has a mesh - like grill portion 502 in which a plurality of through - holes 501 are formed, and a frame portion 503 surrounding the outer periphery of the grill portion 502. As shown in FIG. 12(A), in the bottom wall portion 50, the upper surface 502a of the grill portion 502 is slightly offset downward in the direction of the straight line Lz from the upper surface 503a of the frame portion 503.

[0058] As shown in Fig. 11(B), the peripheral wall portion 55 has side wall portions 51 and 52 that face each other with the grill portion 502 interposed therebetween in the X direction, and side wall portions 53 and 54 that face each other with the grill portion 502 interposed therebetween in the Y direction.

[0059] As shown in Fig. 12(A), the side wall portion 51 has a base portion 510 connected to the bottom wall portion 50. The base portion 510 is provided over the entire length of the bottom wall portion 50 in the Y direction. On the upper surface 510a (bonding surface) of the base portion 510, a protruding wall 511 protruding upward in the direction of the straight line Lz is provided. An engaging hole 511a penetrating the protruding wall 511 is provided in the protruding wall 511. As shown in Fig. 11(A), the side wall portion 52 has a shape symmetric to the side wall portion 51 with the grill portion 502 interposed therebetween. The side wall portion 52 also has a base portion 520 connected to the bottom wall portion 50 and a protruding wall 521 protruding from the base portion 520. An engaging hole 521a penetrates the protruding wall 521.

[0060] As shown in Fig. 11(A), a notch portion 545 is formed in the central portion of the side wall portion 54 in the X direction. The notch portion 545 is provided over the entire length of the side wall portion 54 in the direction of the straight line Lz. Engagement holes 54a and 54a penetrating the side wall portion 54 are provided on the side wall portion 51 and the side wall portion 52 sides sandwiching the notch portion 545.

[0061] As shown in Fig. 11(B), in the X direction, the notch width W545 of the notch portion 545 has a width wider than the width W925 of the boss portion 925 provided on the rear cover 92 (see Fig. 7(B)) (W545 > W925).

[0062] As shown in Fig. 12(A), a lid portion 56 is provided below the side wall portion 54 sandwiching the bottom wall portion 50 in the direction of the straight line Lz. As shown in Fig. 12(B), the lid portion 56 is provided over the entire length of the bottom wall portion 50 in the X direction.

[0063] As shown in FIGS. 11(A) and 11(B), the side wall portion 53 is composed of three wall portions arranged at intervals in the X direction. Specifically, it has a protruding wall 531 connected to the side wall portion 51, a protruding wall 532 connected to the side wall portion 52, and a protruding wall 533 disposed between the protruding walls 531 and 532. As shown in FIG. 12(B), the protruding walls 531 and 532 are respectively provided with engaging holes 531a and 532a that penetrate the protruding walls 531 and 532.

[0064] As shown in FIG. 12(B), in the X direction, intervals CL1 and CL1 are provided between the protruding wall 533 and the protruding walls 531 and 532. The protruding walls 531 and 532 and the protruding wall 533 are connected via connecting walls 536 and 537 respectively. The upper surfaces 536a and 537a of the connecting walls 536 and 537 are slightly positioned above the upper surface 503a of the frame portion 503 of the bottom wall portion 50.

[0065] In FIG. 11(B), cross-hatching is applied to the upper surfaces 510a and 520a of the base portions 510 and 520 of the side wall portions 51 and 52, and the upper surfaces 536a and 537a of the connecting walls 536 and 537. These upper surfaces 510a, 520a, 536a, and 537a are flat surfaces perpendicular to the straight line Lz and constitute the joint surfaces with the upper case 4.

[0066] As shown in FIG. 12(B), the protruding wall 533 has a first side surface 533b and a second side surface 533c along the straight line Lz direction, and a third side surface 533a connecting the upper end portions of the first side surface 533b and the second side surface 533c in the straight line Lz direction.

[0067] In the X direction, the width W3 from the first side surface 533b to the second side surface 533c substantially matches the opening width W1 of the opening 45 of the upper case 4 (see (B) of FIG. 8) (W3≈W1). Also, in the Z direction, the height H533 from the upper surfaces 536a, 537a of the connecting walls 536, 537 to the third side surface 533a substantially matches the groove length L6 in the straight line Lz direction of the concave grooves 6A, 6B (see (B) of FIG. 10) (H533≈L6). That is, the protruding wall 533 has an area that substantially matches the opening area of the opening 45 of the upper case 4. Thereby, when the lower case 5 is joined to the upper case 4, the opening 45 is blocked by the protruding wall 533 (see (A) of FIG. 14). That is, the protruding wall 533 protrudes in the straight line Lz direction so as to block the opening 45 when the lower case 5 is assembled to the upper case 4.

[0068] Here, as shown in the enlarged area of (A) of FIG. 12, a stepped portion 535 formed by partially notching the protruding wall 533 is provided at the upper end portion of the protruding wall 533. Specifically, the stepped portion 535 has a first stepped surface 535a connected to the third side surface 533a and a second stepped surface 535b connecting the first stepped surface 535a and the inner peripheral surface 533d. The first stepped surface 535a is a flat surface parallel to the straight line Lz. The second stepped surface 535b is a flat surface orthogonal to the straight line Lz.

[0069] When the opening 45 is blocked by the protruding wall 533, in the straight line Lz direction, the third side surface 533a of the protruding wall 533 faces the third side surface 453 of the opening 45. The second stepped surface 535b of the stepped portion 535 faces the bottom surface 42a of the bottom wall portion 42. Also, in the Y direction, the first stepped surface 535a of the stepped portion 535 faces the side surface 42c of the bottom wall portion 42. Thereby, a seal structure is formed at the boundary portion between the bottom wall portion 42 and the protruding wall 533. Therefore, the accommodation space R surrounded by the upper case 4 and the lower case 5 is difficult to communicate with the outside in the Y direction (see (C) of FIG. 10).

[0070] (Fitting walls 7A, 7B) As shown in Fig. 12(B), fitting walls 7A and 7B that protrude away from each other in the X direction are provided on the first side surface 533b and the second side surface 533c of the protruding wall 533. The fitting walls 7A and 7B are continuous walls linearly provided over the entire length of the protruding wall 533 in the direction of the straight line Lz, and are provided in a range spanning from the third side surface 533a of the protruding wall 533 to the connecting walls 536 and 537. These fitting walls 7A and 7B constitute the peripheral edge portion of the protruding wall 533 in the present invention.

[0071] In the X direction, the width W4 from the fitting wall 7A to the fitting wall 7B substantially matches the width W2 from the concave groove 6A to the concave groove 6B of the upper case 4 (see Fig. 8(B)) (W4≈W2).

[0072] As shown in Fig. 13, the fitting walls 7A and 7B are provided between the inner peripheral surface 533d and the outer peripheral surface 533e of the protruding wall 533 in the Y direction. The fitting wall 7A has side surfaces 71 and 72 orthogonal to the first side surface 533b of the protruding wall 533, and an end surface 73 connecting the tip portions of the side surfaces 71 and 72 in the X direction. The fitting wall 7B has side surfaces 71 and 72 orthogonal to the second side surface 533c of the protruding wall 533, and an end surface 73 connecting the tip portions of the side surfaces 71 and 72 in the X direction.

[0073] As shown in the enlarged area of Fig. 13, the thickness T7 of the fitting walls 7A and 7B in the Y direction substantially matches the groove width W65 of the region where the ribs 65 (see the virtual lines in the figure) are provided in the concave grooves 6A and 6B (T7≈W65). Also, the protruding lengths L7 of the fitting walls 7A and 7B from the first side surface 533b and the second side surface 533c in the X direction are set to be shorter than the groove depths D6 of the concave grooves 6A and 6B, respectively (L7<D6). Thereby, the fitting walls 7A and 7B are in surface contact with the groove walls 62 of the concave grooves 6A and 6B at the side surface 71, and are in line contact with the ribs 65 at the side surface 72.

[0074] As shown in Fig. 14(A), when the lower case 5 is assembled to the upper case 4 to form the case 3, the engaging hole 521a provided in the side wall portion 52 of the lower case 5 engages with the engaging protrusion 417 of the side wall portion 412 of the upper case 4. The engaging holes 531a and 532a provided in the side wall portion 53 of the lower case 5 engage with the engaging protrusions 419 and 419 of the connecting wall portion 413 of the upper case 4. As shown in Fig. 14(B), the engaging holes 54a and 54a provided in the side wall portion 54 engage with the engaging protrusions 928 and 928 provided in the common wall portion 414. Further, the engaging hole 511a provided in the side wall portion 51 of the lower case 5 (see Fig. 12(A)) engages with the engaging protrusion 417 of the side wall portion 411 of the upper case 4 (see Fig. 5(A)). The opening window 923 of the rear cover 92 is closed by the lid portion 56 of the lower case 5.

[0075] Also, as shown in Fig. 5(B), on the first lower end surfaces 415a and 415a of the side wall portions 411 and 412 of the upper case 4, the upper surface 510a of the base portion 510 of the lower case 5 and the upper surface 520a of the base portion 520 respectively come into contact. Further, on the lower end surfaces 46a and 47a of the peripheral portions 46 and 47 (see Fig. 8(B)), the upper surfaces 536a and 537a of the connecting walls 536 and 537 of the lower case 5 (see Fig. 12(B)) come into contact.

[0076] That is, the first lower end surfaces 415a and 415a in the upper case 4 (see Fig. 8(A)), and the lower end surfaces 46a and 47a of the peripheral portions 46 and 47 (see Fig. 8(B)), and the upper surfaces 510a, 520a, 536a, and 537a in the lower case 5 (see Fig. 11(B)) constitute the joint surfaces in the present application.

[0077] Also, as shown in Fig. 5(B), when viewed from the X direction, the second lower end surface 415b and 415b sides of the side wall portions 411 and 412 of the upper case 4 overlap with the base portions 510 and 520 of the lower case 5.

[0078] And in the present embodiment, as shown in FIG. 10(C), the opening 45 of the upper case 4 is closed by inserting the protruding wall 533 of the lower case 5 from the lower side in the Z direction. The fitting wall 7B (see the broken line in the figure) is inserted into the concave groove 6B from the lower end surface 47a side of the peripheral edge 47, moves upward in the Z direction, and finally faces the third side surface 453 of the opening 45 with a slight gap therebetween.

[0079] In this state, as shown in FIG. 16, when viewed from the Y direction, the peripheral edges 46 and 47 of the opening 45 overlap with the fitting walls 7A and 7B which are the peripheral edges of the protruding wall 533.

[0080] Also, as shown in FIG. 12(A), when viewed from the Y direction, the first stepped surface 535a of the protruding wall 533 is overlapped with the stepped surface 42b of the bottom wall portion 42 of the upper case 4.

[0081] Thereby, when viewed from the X direction and the Y direction which are directions orthogonal to the joining direction (Z direction) of the case 3, the regions around the joint portion between the upper case 4 and the lower case 5 overlap with each other. Thereby, the sealing property of the accommodation space R of the case 3 is ensured.

[0082] (Case structure 100) FIG. 15 is a diagram for explaining the sound pressure generated in the case 3. FIG. 15 is a schematic cross-sectional view of the speaker unit 1 in FIG. 14(A) cut along the plane B. FIG. 16 is a diagram for explaining the case structure 100. FIG. 16 is a schematic cross-sectional view of the A-A cross section in FIG. 15.

[0083] As shown in FIG. 15, in the speaker unit 1, the speaker unit 2 is housed in an accommodation space R surrounded by an upper case 4 and a lower case 5. The speaker unit 2 is housed in the accommodation space R in a state where the front-rear direction of the speaker unit 2 is arranged along the direction of the straight line Lz. The speaker unit 2 has a drive unit 20 that generates sound and a support unit 21 that supports the drive unit 20. The speaker unit 2 is housed in the accommodation space R of the upper case 4 and the lower case 5 with the diaphragm 201 (cone paper) of the drive unit 20 constituting the front face facing downward in the direction of the straight line Lz. A wiring Sb is connected to the drive unit 20 of the speaker unit 2. The wiring Sb is electrically connected to a connector portion C2 provided on a printed circuit board 94.

[0084] As shown in FIG. 6, the support unit 21 of the speaker unit 2 has a flange portion 210 that surrounds the outer peripheral edge of the diaphragm 201. A through hole 211 penetrates the flange portion 210 in the direction of the straight line Lz. The speaker unit 2 is fixed to the upper case 4 by screwing a bolt B4 that penetrates the through hole 211 with the flange portion 210 seated on the seating portion 43 of the upper case 4.

[0085] As shown in FIG. 15, in a state where the upper case 4 and the lower case 5 are joined, the flange portion 210 of the speaker unit 2 abuts against the frame portion 503 of the bottom wall portion 50 of the lower case 5 in the direction of the straight line Lz. The diaphragm 201 of the speaker unit 2 faces the grill portion 502 with a gap therebetween. In the speaker unit 2, portions other than the flange portion 210 are arranged with a gap from the upper case 4 and the lower case 5.

[0086] When the diaphragm 201 vibrates as the drive unit 20 of the speaker unit 2 is driven, a sound pressure Sp in the positive phase is generated toward the front side of the diaphragm 201 (the lower side in the direction of the straight line Lz), and a sound pressure Sp' in the reverse phase is generated toward the rear side of the diaphragm 201 (the upper side in the direction of the straight line Lz). The sound pressure Sp in the positive phase and the sound pressure Sp' in the reverse phase each spread spherically from the diaphragm 201. In the present embodiment, with the contact surface P between the flange portion 210 and the lower case 5 as a boundary, the lower side in the direction of the straight line Lz from the contact surface P is a region where the sound pressure Sp in the positive phase is generated, and the upper side is a region where the sound pressure Sp' in the reverse phase is generated. Therefore, as shown in FIG. 16, when viewed from the direction of the straight line Lz, the sound pressure Sp' in the reverse phase acts on substantially the entire surface of the peripheral wall portion 41 of the upper case 4.

[0087] Here, among the peripheral wall portion 41, the side wall portions 411, 412, and the common wall portion 414 are continuous walls formed integrally with the rear cover 92, so they have high rigidity strength. Therefore, the influence of the sound pressure Sp' in the reverse phase acting is small. On the other hand, in the present embodiment, in order to secure a working space, an opening 45 is provided in the connecting wall portion 413 of the peripheral wall portion 41, and the opening 45 is structured to be blocked by the protruding wall 533 of the lower case 5. Since the protruding wall 533 is separate from the rear cover 92, its rigidity strength is lower than that of the side wall portions 411, 412, and the common wall portion 414 of the peripheral wall portion 41. Therefore, it is easily affected by the sound pressure Sp' in the reverse phase acting on the protruding wall 533.

[0088] When the sound pressure Sp' acts on the protruding wall 533, the protruding wall 533 is displaced in a direction away from the speaker unit 2, and as a result, a gap is formed between the protruding wall 533 and the opening 45, and thus sound may leak. The sound leaking from the gap between the protruding wall 533 and the opening 45 is out-of-phase sound, which weakens the in-phase sound. Also, when the out-of-phase sound is perceived by the user, it gives the user a sense of discomfort. Further, when the sound pressure Sp' acts on the protruding wall 533, the protruding wall 533 vibrates in the direction in which the sound pressure Sp' acts. When the vibration of the protruding wall 533 propagates throughout the case 3, the case 3 may vibrate. The rattling sound of the case 3 also gives the user a sense of discomfort. In contrast, for example, if the opening 45 is not provided in the connecting wall portion 413 and the wall portion is made continuous with the side wall portions 411 and 412, the rigidity strength against the sound pressure Sp' is ensured, so that sound leakage and rattling are suppressed. However, since there is no working space for screwing in the bolt Bc (see FIG. 4), this leads to a deterioration in the assemblability of the rear cover 92.

[0089] Therefore, in the present embodiment, a case structure 100 is provided in which concave grooves 6A, 6B and fitting walls 7A, 7B that fit with each other are provided on the opening 45 and the protruding wall 533. As shown in FIG. 16, when an out-of-phase sound pressure Sp' acts on the inner peripheral surface 533d of the protruding wall 533 and the protruding wall 533 is pushed in a direction away from the speaker unit 2 in the Y direction (black arrow in the enlarged region of FIG. 16), the side surfaces 71, 71 of the fitting walls 7A, 7B are respectively pressed against the groove walls 62, 62 of the concave grooves 6A, 6B. At this time, reaction forces act on the side surfaces 71, 71 of the fitting walls 7A, 7B from the groove walls 62, 62 of the concave grooves 6A, 6B respectively (white arrows in the enlarged region of FIG. 16).

[0090] Thereby, since the pressing force by the sound pressure Sp' and the reaction forces from the concave grooves 6A, 6B are balanced, the displacement of the protruding wall 533 in the direction away from the speaker unit 2 is reduced. Therefore, in the case structure 100 according to the present embodiment, it is possible to secure a working space, suppress sound leakage, and suppress rattling.

[0091] Furthermore, in the case structure 100 according to the present embodiment, ribs 65 are provided on the groove wall 63 side of the concave grooves 6A and 6B. As a result, the side surfaces 72, 72 of the fitting walls 7A, 7B also come into contact with the ribs 65. Thus, the fitting walls 7A, 7B are supported by the concave grooves 6A, 6B from both sides in the Y direction. Thereby, it is possible to reduce the rattling of the fitting walls 7A, 7B within the concave grooves 6A, 6B as the sound pressure Sp' changes.

[0092] In this case, it is also conceivable to simply narrow the distance W6 (see FIG. 9) between the groove walls 62 and 63 without providing the ribs 65. However, the fitting walls 7A, 7B will be in surface contact with both of the groove walls 62, 63 of the concave grooves 6A, 6B. Then, the resistance when inserting the fitting walls 7A, 7B into the concave grooves 6A, 6B increases, which affects workability. Therefore, by providing the ribs 65 that narrow the distance between the groove walls 62 and 63 as in the present application, the side of the fitting walls 7A, 7B that contacts the ribs 65 will be in line contact, so the resistance during insertion becomes smaller. Thus, the fitting walls 7A, 7B can be inserted into the concave grooves 6A, 6B with a light force, leading to an improvement in workability.

[0093] As described above, the case structure 100 according to the present embodiment has the following configuration. (1) It is a case structure 100 of a case 3 that houses the speaker unit 2. The case 3 has an upper case 4 (first housing) and a lower case 5 (second housing) that are assembled to each other in the straight line Lz direction (first direction). In the upper case 4, an opening 45 (first opening) that connects the inside and outside of the peripheral wall portion 41 (wall portion) covering the speaker unit 2 is formed up to the lower end surfaces 46a, 47a of the peripheral edge portions 46, 47 that are the joint surfaces with the lower case 5. The lower case 5 has a protruding wall 533 that protrudes in the straight line Lz direction so as to close the opening 45 when the lower case 5 is assembled to the upper case 4. When viewed from the direction of the straight line Ly (the second direction) orthogonal to the direction of the straight line Lz, the fitting walls 7A and 7B, which are the peripheral portions of the protruding wall 533, and the peripheral portions 46 and 47 of the opening 45 in the peripheral wall portion 41 overlap each other. In the peripheral portions 46 and 47 (one peripheral portion) of the opening 45, concave grooves 6A and 6B into which the fitting walls 7A and 7B (the other peripheral portion) of the protruding wall 533 are inserted are provided.

[0094] The sound pressures Sp and Sp' generated from the speaker unit 2 spread spherically. Therefore, the sound pressures Sp and Sp' also act on the upper case 4. Here, if the opening 45 is formed in the peripheral wall portion 41 covering the speaker unit 2, simply closing the opening 45 with the protruding wall 533 may cause a gap to occur between the protruding wall 533 and the opening 45 when the sound pressures Sp and Sp' (especially the sound pressure Sp') act, resulting in sound leakage. Also, as a result of the protruding wall 533 vibrating due to the sound pressure Sp', the case 3 itself may vibrate, and the required sound pressure may not be ensured. Therefore, with the above configuration, even when the sound pressure acts on the protruding wall 533, since the fitting walls 7A and 7B are fitted into the concave grooves 6A and 6B, a reaction force in the direction against the sound pressure Sp' is generated on the protruding wall 533. As a result, the vibration of the protruding wall 533 is suppressed, and it becomes difficult for a gap to occur between the protruding wall 533 and the opening 45. Thereby, since the state where the opening 45 is closed by the protruding wall 533 is maintained, sound leakage and the vibration of the case 3 can be suppressed.

[0095] The case structure 100 according to the present embodiment has the following configuration. In the above (1), (2) The concave grooves 6A and 6B are provided with ribs 65 and 65 that narrow the groove width W6 of the concave grooves 6A and 6B.

[0096] With this configuration, it is possible to reduce the rattling of the protruding wall 533 within the concave grooves 6A and 6B. Here, it is also conceivable to simply reduce the groove width W6 (see FIG. 9) without providing the rib 65. However, the fitting walls 7A and 7B will be in surface contact with both of the groove walls 62 and 63 of the concave grooves 6A and 6B. Then, the resistance when inserting the fitting walls 7A and 7B into the concave grooves 6A and 6B will increase, which will affect the workability when assembling the lower case 5 to the upper case 4. Therefore, configured as described above, by providing the ribs 65 in the concave grooves 6A and 6B, the side of the protruding wall 533 that contacts the rib 65 will be in line contact, so the resistance during insertion will be reduced, leading to an improvement in workability.

[0097] The case structure 100 according to this embodiment has the following configuration. In the above (1) or (2), (3) The direction of the straight line Lz is the direction along the front-rear direction of the speaker unit 2. The lower case 5 is assembled to the upper case 4 from the side of the diaphragm 201 (front side) of the speaker unit 2 in the direction of the straight line Lz. The opening 45 and the protruding wall 533 are arranged at least on the side of the reverse phase of the sound emitted from the speaker unit 2.

[0098] In the sound pressures Sp and Sp' that spread spherically, particularly when the sound having the reverse-phase sound pressure Sp' leaks to the outside and interferes with the sound having the positive-phase sound pressure Sp, it may affect the sound perceived by the user. Therefore, configured as described above, it is possible to reduce the leakage of the sound having the reverse-phase sound pressure Sp' outside the case 3, so it is possible to reduce the influence on the sound perceived by the user.

[0099] The case structure 100 according to this embodiment has the following configuration. In any one of the above (1) to (3), (4) When viewed from the direction of the straight line Ly, the concave grooves 6A and 6B are located on both sides of the opening 45 in the X direction (width direction).

[0100] Configured in this way, the support stability of the protruding wall 533 with respect to the sound pressures Sp and Sp' is improved.

[0101] The case structure 100 according to this embodiment has the following configuration. In any one of (1) to (4) above, (5) It has a back cover 92 (third housing) provided with a switch device 9 electrically connected to the speaker unit 2. The peripheral wall portion 41 of the upper case 4 shares a region located on the side opposite to the opening 45 in the direction of the straight line Ly with the back cover 92. In the shared wall portion 414, which is the region of the peripheral wall portion 41 shared with the back cover 92, a countersunk hole 921c (second opening) for accessing the inside of the back cover 92 from the opening 45 side is provided.

[0102] With this configuration, when assembling the switch device 9, the opening 45 can be used as a working space for accessing the countersunk hole 921c. Thereby, in the switch device 9, it is possible to achieve both improvement in workability and reduction of sound leakage.

[0103] (Modification) FIG. 17 is a diagram for explaining a case structure 100A according to a modification. In this embodiment, the concave grooves 6A and 6B are provided at the peripheral edge of the opening 45 of the upper case 4, and the fitting walls 7A and 7B are provided at the peripheral edge of the protruding wall 533 of the lower case 5 as an example. However, it is not limited to this aspect.

[0104] For example, as shown in FIG. 17, fitting walls 7A' and 7B' may be provided on the opening 45A side of the upper case 4A, and concave grooves 6A' and 6B' may be provided on the protruding wall 533A side of the lower case 5A. In the case structure 100A according to the modification, ribs 75 and 75 are provided on the side surfaces 72' and 72' of the fitting walls 7A' and 7B'. That is, in the case structure 100A according to the modification, the fitting walls 7A' and 7B' constitute the peripheral edge of the opening 45A. Also, the region surrounding the concave grooves 6A' and 6B' in the protruding wall 533A constitutes the peripheral edge of the protruding wall 533A.

[0105] In this case, a sound pressure Sp' of an opposite phase acts on the inner peripheral surface 533d of the protruding wall 533A, and the protruding wall 533A is pushed in a direction away from the speaker unit 2 in the Y direction (black arrow in the enlarged area of FIG. 17). Then, the groove walls 63', 63' of the concave grooves 6A', 6B' are brought into pressure contact with the side surfaces 71', 71' of the fitting walls 7A', 7B', respectively. At this time, a reaction force acts on the groove walls 63', 63' of the concave grooves 6A', 6B' from the side surfaces 71', 71' of the fitting walls 7A', 7B' (white arrow in the enlarged area of FIG. 17).

[0106] As a result, since the pressing force by the sound pressure Sp' and the reaction force from the fitting walls 7A', 7B' are balanced, the displacement of the protruding wall 533A in the direction away from the speaker unit 2 is reduced.

[0107] As described above, the case structure 100A according to the modification has the following configuration. (I) It is a case structure 100A of the case 3 that houses the speaker unit 2. The case 3A has an upper case 4A (first housing) and a lower case 5A (second housing) that are assembled to each other in the straight line Lz direction (first direction). In the upper case 4A, an opening 45A (first opening) that communicates the inside and the outside of the peripheral wall portion 41A (wall portion) covering the speaker unit 2 is formed up to the lower end surfaces 46a, 47a of the peripheral edges 46, 47 that are the joint surfaces with the lower case 5A. The lower case 5A has a protruding wall 533A that protrudes in the straight line Lz direction so as to close the opening 45A when the lower case 5A is assembled to the upper case 4A. When viewed from the straight line Ly direction (second direction) orthogonal to the straight line Lz direction, the fitting walls 7A', 7B' that are the peripheral edges of the opening 45A and the concave grooves 6A', 6B' that are the peripheral edges of the protruding wall 533A overlap each other. The fitting walls 7A', 7B' of the opening 45A constitute one peripheral edge. The region surrounding the concave grooves 6A' and 6B' of the protruding wall 533A constitutes the other peripheral portion into which the fitting walls 7A' and 7B' are inserted.

[0108] By configuring it in this way, it is possible to achieve both ensuring the working space and suppressing sound leakage.

[0109] As described above, the embodiments and modifications of the present invention have been explained. However, the present invention is not limited to these, and can be appropriately changed within the scope of the technical idea of the invention.

Explanation of Reference Numerals

[0110] 1 Speaker unit 2 Speaker unit 3 Case 4 Upper case 5 Lower case 6A, 6B Concave groove 7A, 7B Fitting wall (peripheral portion) 9 Switch device 41 Peripheral wall portion (wall portion) 45 Opening (first opening) 46 Peripheral portion 46a Lower end surface (joint surface) 47 Peripheral portion 47a Lower end surface (joint surface) 65 Rib 91 Operation panel 92 Rear cover (third housing) 100 Case structure 413 Connection wall portion 414 Shared wall portion (region shared with the third housing in the wall portion) 533 Protruding wall 921c Counterbore (second opening) Bc Bolt Sp Sound pressure of positive phase Sp' Sound pressure of reverse phase Lx Straight line Ly Straight line (second direction) Lz Straight line (first direction)

Claims

1. A case structure of a case for housing a speaker unit, The case has a first housing and a second housing that are assembled to each other in a first direction, In the first housing, a first opening that communicates the inside and the outside of the wall portion is formed up to the joint surface with the second housing in a wall portion that covers the speaker unit, The second housing has a protruding wall that protrudes in the first direction so as to close the first opening when the second housing is assembled to the first housing, A case structure characterized in that a concave groove into which the other peripheral edge is inserted is provided in one of the peripheral edge of the protruding wall and the peripheral edge of the first opening.

2. In claim 1, A case structure characterized in that a rib that narrows the groove width of the concave groove is provided in the concave groove.

3. In claim 1, The first direction is a direction along the front-rear direction of the speaker unit, The second housing is assembled to the first housing from the front side of the speaker unit, A case structure characterized in that the first opening and the protruding wall are arranged at least on the antiphase side of the sound emitted from the speaker unit.

4. In claim 1, A case structure characterized in that the concave groove is located on both sides in the width direction of the first opening when viewed from a second direction orthogonal to the first direction.

5. In any one of claims 1 to 4, It has a third housing provided with a switch that is electrically connected to the speaker unit, A region of the wall portion of the first housing that is located on the side opposite to the first opening in a second direction orthogonal to the first direction is shared with the third housing, A case structure characterized in that a second opening for accessing the inside of the third housing from the first opening side is provided in a region shared with the third housing in the wall portion.

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