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 technology]

[0002] Patent Document 1 discloses a speaker device having a speaker unit and a case that houses the speaker unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-304236 Summary of the Invention [Problem to be solved by the invention]

[0004] The case that houses the speaker unit may be formed by combining multiple housings. In this case, the sound emitted from the speaker unit may leak through the gaps between the housings, which may affect the sound perceived by the user.

[0005] Therefore, there is a need to provide a case structure that can suppress sound leakage from a case that houses a speaker unit. In addition to such requirements, another objective of the present invention is to achieve actions and effects derived from the various configurations disclosed in the "Forms for Implementing the Invention" described below, which actions and effects cannot be obtained with conventional technologies. [Means for solving the problem]

[0006] The present invention provides A case structure for a case that houses a speaker unit, the case has a first housing and a second housing assembled to each other in a first direction; In the first housing, a wall portion covering the speaker unit has a first opening portion that communicates the inside and outside of the wall portion and that extends to a 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, One of the peripheral edge of the protruding wall and the peripheral edge of the first opening has a recessed groove into which the other peripheral edge is inserted. And, a third housing provided with a switch electrically connected to the speaker unit; a region of the wall portion of the first housing that is located on an opposite side to the first opening in a second direction orthogonal to the first direction is shared with the third housing; A second opening is provided in the wall portion in a region shared with the third housing, for accessing the inside of the third housing from the first opening side. The case structure is designed to accommodate this. [Effects 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 explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a diagram illustrating a switch device. [Figure 2] FIG. [Figure 3] 10A and 10B are diagrams illustrating the arrangement of a speaker unit on the rear cover. [Figure 4] FIG. 2 is a schematic cross-sectional view of the switch device. [Figure 5] FIG. 2 is a schematic cross-sectional view of the switch device. [Figure 6] FIG. [Figure 7] FIG. 2 is a schematic cross-sectional view of a speaker unit. [Figure 8] FIG. [Figure 9] FIG. 2 is a schematic cross-sectional view of an upper case. [Figure 10] FIG. 2 is a schematic cross-sectional view of an upper case. [Figure 11] FIG. [Figure 12] FIG. [Figure 13] FIG. 10 is a diagram illustrating a protruding wall. [Figure 14] 10A and 10B are diagrams illustrating the joining of the upper case and the lower case. [Figure 15] FIG. 4 is a diagram illustrating sound pressure generated inside the case. [Figure 16] FIG. 2 is a diagram illustrating a case structure. [Figure 17] 10A and 10B are diagrams illustrating a case structure according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] In this embodiment, a speaker unit 1 provided in a switch device 9 for a vehicle will be described by taking as an example a case in which a case structure 100 is used. The switch device 9 can be disposed, for example, on an instrument panel of the vehicle. Fig. 1 is a diagram illustrating a switch device 9. Fig. 1 is a perspective view of the switch device 9 as seen from the user side. Fig. 2 is a diagram illustrating the switch device 9. Fig. 2 is an exploded perspective view of the switch device 9 as seen from the speaker unit 1 side. Note that in the enlarged view of Fig. 2, the lower case 5 of the speaker unit 1 is not shown, and only the upper case 4 is shown. Fig. 3 is a diagram illustrating the arrangement of the speaker unit 1 on the rear cover 92. Fig. 3(A) is an enlarged plan view schematically showing the area in the upper case 4 where the speaker unit 1 is provided. Fig. 3(B) is a diagram showing the area around the upper case 4 before assembly, with the lower case 5 to be assembled to the upper case 4 positioned at a distance from the upper case 4. Fig. 4 is a schematic cross-sectional view of the switch device 9. Fig. 4 shows a cross section of the switch device 9 taken along line AA in Fig. 3(A) together with other components of the switch device 9. Fig. 5 is a schematic cross-sectional view of the switch device 9. Fig. 5(A) is a schematic cross-sectional view of the speaker unit 1 taken along line AA in Fig. 4. Fig. 5(B) is a schematic cross-sectional view of the speaker unit 1 taken along line BB in Fig. 4. 4 and 5, the speaker units 2 are not shown, and the areas where the speaker units 2 are arranged are indicated by imaginary lines.

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

[0011] 1, the switch device 9 includes a plurality of switches SW. The switches SW are used by a user to operate various in-vehicle devices such as an air conditioner, an audio device, a car navigation device, etc. The switches SW may be, for example, capacitance-type touch sensors.

[0012] The switch device 9 is provided with a speaker unit 1 on the front side in the Y direction (second direction). When the switch device 9 is arranged on the instrument panel, the switch SW is exposed inside the vehicle interior VR, and the speaker unit 1 is provided in a position where it is not exposed inside the vehicle interior VR. When the switch SW is operated, the speaker unit 1 outputs an alarm sound or the like to notify the user of the operation of the switch SW.

[0013] The switch device 9 has an operation panel 91 provided with a 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] 2, the switch device 9 has a basic configuration in which an intermediate case 93 and a printed circuit board 94 are housed 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 assembly direction of the rear cover 92 to the operation panel 91 (Y direction in the figure).

[0015] 1, marks Mk indicating the functions of the switches SW are displayed on a surface 91a of the operation panel 91 that is exposed to the vehicle interior VR. Examples of the marks Mk include those indicating air conditioner ON / OFF, outside air intake, inside air circulation, seat heater, etc.

[0016] 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] Furthermore, a sheet-like electrostatic sensor S is attached to the rear surface 91b of the operation panel 91 (see FIG. 4). The electrostatic sensor S has a sensor portion that corresponds one-to-one to each switch SW (see FIG. 1) of the operation panel 91. The electrostatic sensor S is electrically connected to a connector portion C1 of the printed circuit board 94 via a wiring Sa.

[0018] The intermediate case 93 has a band-shaped base 930 and a peripheral wall 932 that surrounds the entire outer periphery of the base 930. The base 930 is oriented along the X direction. When viewed from the Y direction, the base 930 is provided with through holes 931 at positions that overlap with the bolt bosses 911 (911a to 911f) of the operation panel 91. The number of through holes 931 provided is the same as the number of bolt bosses 911.

[0019] A strip-shaped printed circuit board 94 is provided on the opposite side of the intermediate case 93 in the Y direction from the operation panel 91. The printed circuit board 94 is oriented along the X direction. When viewed from the Y direction, the printed circuit board 94 has through holes 941 formed in positions that overlap the bolt bosses 911 of the operation panel 91 and the through holes 931 of the intermediate case 93. The number of through holes 931 provided is the same as the number of bolt bosses 911.

[0020] The printed circuit board 94 has three connectors C1, C2, and C3 on a surface 94b facing the rear cover 92 in the Y direction. The connector C1 is electrically connected to a wiring Sa of the electrostatic sensor S. The connector C2 is electrically connected to a wiring Sb (see FIG. 6) of the speaker unit 2, which will be described later. The connector C3 is electrically connected to a power supply line (not shown).

[0021] Although not shown in the drawings, the printed circuit board 94 has a light-emitting element (LED) on a surface 94a facing the intermediate case 93 in the Y direction. The intermediate case 93 is provided with a lens that diffuses light emitted from the light-emitting element. The light-emitting element and the lens are positioned so as to overlap the mark Mk (see FIG. 1) of each switch SW on the operation panel 91 when viewed from the linear Y direction. This allows the user to visually recognize whether the mark Mk of the operated switch SW is on or off.

[0022] As shown in Fig. 2, the rear cover 92 has a strip-shaped base 920. The rear cover 92 is provided with the base 920 oriented along the X direction. As shown in Fig. 4, the upper case 4, which is a component of the speaker unit 1, is provided in approximately the center of the base 920 in the X direction. The upper case 4 and the base 920 are integrally formed resin parts.

[0023] 2, six countersunk holes 921 (921a to 921f) are provided in the base 920 of the rear cover 92. The countersunk holes 921 (921a to 921f) are provided at intervals in the X direction. The number of the countersunk 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 countersunk holes 921a and 921b are located on one side (diagonally upper left in Figure 2) when viewed from the upper case 4, and three countersunk holes 921d, 921e, and 921f are located on the other side (diagonally lower right in Figure 2). The countersunk hole 921c (second opening) is provided in a region overlapping with the upper case 4 when viewed from the Y direction.

[0025] 4, when the rear cover 92 is attached to the operation panel 91, the intermediate case 93 and the printed circuit board 94 are housed in a sandwiched state 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] As a result, by screwing the bolt B (Ba to Bf) inserted into the countersunk hole 921 of the rear cover 92 into the bolt boss 911 on the operation panel 91 side, the housing of the switch device 9 is formed between the operation panel 91 and the rear cover 92, with the intermediate case 93 and printed circuit board 94 sandwiched between them.

[0027] FIG. 6 is an exploded perspective view of the speaker unit 1. As shown in FIG. Fig. 7 is a schematic cross-sectional view of the speaker unit 1. Fig. 7(A) is a schematic cross-sectional view of the speaker unit 1 and its surroundings taken along line CC in Fig. 4. Fig. 7(B) is a schematic cross-sectional view of the speaker unit 1 and its surroundings taken along line AA in Fig. 7(A). 8A and 8B are diagrams illustrating the upper case 4. Fig. 8A is a perspective view of the upper case 4 as seen from below in the Z direction. In Fig. 8A, the connector portion C2 provided on the printed circuit board 94 is shown by imaginary lines. Fig. 8B is a plan view of the upper case 4 as seen from the opening 45 side. Fig. 9 is a schematic cross-sectional view of the upper case 4. Fig. 9 is a schematic cross-sectional view of the upper case 4 taken along line AA in Fig. 8(B). Fig. 10 is a schematic cross-sectional view of the upper case 4. Fig. 10(A) is a schematic cross-sectional view of the upper case 4 taken along line AA in Fig. 9(A). Fig. 10(B) is a schematic cross-sectional view of the upper case 4 taken along line AA in Fig. 10(A). Fig. 10(C) is a schematic cross-sectional view of Fig. 10(B) with the lower case 5 superimposed thereon.

[0028] 6, the speaker section 1 has a speaker unit 2 and a case 3 that houses the speaker unit 2. The case 3 has an upper case 4 (first housing) that is formed integrally with the rear cover 92, and a lower case 5 (second housing) that is provided so as to be engageable with and detachable from the upper case 4.

[0029] The upper case 4 and the lower case 5 are joined to each other along a line Lz (first direction) along the Z direction, with the speaker unit 2 sandwiched between them. The speaker unit 2 is fixed to the upper case 4 with a bolt B4. A line Ly passing through the center of the countersunk hole 921c is a line along the Y direction. The lines Lz and Ly are perpendicular to each other.

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

[0031] 9, the peripheral wall 41 has a generally rectangular shape surrounding the line Lz when viewed in the direction of the line Lz. The peripheral wall 41 is cylindrically formed from a pair of side walls 411, 412 spaced apart in the X direction (the left-right direction in the figure), a connecting wall 413 connecting the distal ends of the side walls 411, 412, and a shared wall 414 connecting the proximal ends of the side walls 411, 412. The shared wall 414 is an area of ​​the base 920 of the rear cover 92 that overlaps with the upper case 4.

[0032] 9, the line Lx is a line that runs along the X direction and passes through the midpoint between the pair of side wall portions 411 and 412. The line Ly is a line that runs along the Y direction and passes through the midpoint between the connecting wall portion 413 and the shared wall portion 414. The line Lz is a line that is perpendicular to the lines Lx and Ly.

[0033] The inside of the peripheral wall 41 is an accommodation space R for the speaker unit 2. A seating portion 43 is provided inside the peripheral wall 41, which serves as a mounting surface for the speaker unit 2. The seating portion 43 is provided across the four corners of the peripheral wall 41, which has a substantially rectangular shape.

[0034] 9, the pair of side wall portions 411 and 412 are located on one side and the other side of a straight line Ly in the X direction. The side wall portions 411 and 412 are formed in symmetrical shapes at symmetrical positions sandwiching the straight line Ly therebetween.

[0035] Recesses 416 are formed on the outer periphery of the side wall portions 411 and 412 at approximately the middle in the longitudinal direction (vertical direction in the drawing). The recesses 416 are grooves with a rectangular cross section that open to the outer periphery surfaces 411a and 412a of the side wall portions 411 and 412.

[0036] 5A, the recesses 416, 416 have lengths L416, L416 that extend to the lower ends of the side wall portions 411, 412 in the direction of the straight line Lz. The recesses 416, 416 are provided with engagement protrusions 417, 417 at positions closer to the bottom wall portion 42 in the direction of the straight line Lz. As shown in FIG. 9, the engagement protrusions 417, 417 are located closer to the connecting wall portion 413 (upper side in the drawing) than to the direction of the straight line Lx.

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

[0039] As a result, 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. Additionally, the second lower end surface 415b side overlaps the lower case 5 when viewed from the X direction. As a result, the upper case 4 and the lower case 5 form a sealed structure at their boundary, making it difficult for the housing space R surrounded by the upper case 4 and the lower case 5 to communicate with the outside in the X direction.

[0040] As shown in Fig. 8, recesses 418, 418 are formed on the outer periphery of the connecting wall portion 413 with the side wall portions 411, 412. As shown in Fig. 9, the recesses 418, 418 are grooves with a rectangular cross section that open into the outer periphery surfaces 411a, 412a of the side wall portions 411, 412 and the outer periphery 413a of the connecting wall portion 413. As shown in Fig. 7(A), the recesses 418, 418 have a length L418 in the direction of the straight line Lz that reaches the end 413c of the connecting wall portion 413 on the lower case 5 side. The recesses 418, 418 are provided with engagement protrusions 419, 419.

[0041] 9, an opening 45 (first opening) is provided in the approximate center in the direction of the straight line Lx in the connecting wall portion 413. The opening 45 penetrates the connecting wall portion 413 in the thickness direction (the vertical direction in the figure).

[0042] The boundary between the connecting wall portion 413 and the opening 45 is formed as peripheral portions 46, 47 having recessed grooves 6A, 6B. The peripheral portions 46, 47 have thicknesses W46, W47 in the direction of the straight line Ly, and predetermined widths L46, L47 in the direction of the straight line Lx (left-right direction in the drawing).

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

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

[0045] In this embodiment, the grooves 6A and 6B are formed by utilizing the thickness of the peripheral edges 46 and 47. The grooves 6A and 6B have shapes that are symmetrical with respect to the straight line Ly. In the following explanation, the shape of the groove 6A will be described using the groove 6A as an example.

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

[0047] In the recessed 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 arc shape with an apex 65a facing the groove wall 62 side. In the recessed groove 6A, the groove width W65 in the area where the rib 65 is provided is narrower than the groove width W6 in the area where the rib 65 is not provided (W65 <W6)。

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

[0049] The ribs 65 are linear protrusions extending along the line Lz inside the recessed grooves 6A and 6B. In the line Lz direction, the ribs 65 are formed to have a length that extends from the third side surface 453 of the opening 45 to near the lower end surfaces 46a and 47a of the peripheral portions 46 and 47.

[0050] 10(B), there is an area of ​​height h65 where ribs 65 are not provided on the lower end surface 47a side of peripheral edge portion 47. In this area, the opening area of ​​recessed groove 6B on the lower end surface 47a side of peripheral edge portion 47 is wider by the amount of ribs 65 not provided. This makes it easier to insert a fitting wall 7B (see FIG. 10(C)) of the lower case 5, which will be described later, into the recessed groove 6B than if the lower end 65c of the rib 65 were flush with the lower end surface 47a of the peripheral edge 47. Although not shown, the same applies to the rib 65 provided in the recessed groove 6A.

[0051] As shown in FIG. 8B, the common wall portion 414 of the peripheral wall portion 41 and the countersunk hole 921c are located on the rear side of the opening 45 in the direction of the straight line Ly. 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 FIG. 8(A), the countersunk hole 921c of the rear cover 92 is provided in the common wall portion 414. An opening window 923 is provided on the underside of 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, a connector portion C2 (see the imaginary 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 to the connector portion C2 of the printed circuit board 94 from the opening window 923.

[0053] 4, a boss 925 surrounding the countersunk hole 921c is provided on the common wall 414. The boss 925 protrudes in the direction of a straight line Ly from a surface 414a of the common wall 414 facing the printed circuit board 94. Furthermore, the opposing surface 414a of the common wall portion 414 is provided with engagement protrusions 928, 928 on one side and the other side of the boss portion 925 in the X direction.

[0054] 4, a tool T (such as a screwdriver or hex wrench) is used to fasten the rear cover 92 to the operation panel 91 using the bolt B. The opening 45 of the connection wall 413 is provided to ensure a space accessible to the tool T for tightening the bolt Bc housed in the counterbore 921c.

[0055] (Lower Case 5) Fig. 11 is a diagram illustrating the lower case 5. Fig. 11(A) is a perspective view of the lower case 5 as seen from above in the Z direction. Fig. 11(B) is a plan view of the lower case 5. Figure 12 is a diagram illustrating the lower case 5. Figure 12(A) is a schematic diagram of a cross section taken along line AA in Figure 11(B). Figure 12(B) is a view taken along line AA in Figure 12(A). In Figure 12(B), cross-hatching is applied to the side wall portion 53 to make the shape easier to understand. Fig. 13 is a diagram illustrating the protruding wall 533. Fig. 13 is a schematic diagram of the AA cross section of Fig. 12(B). Figure 14 is a diagram illustrating the joining of the upper case 4 and the lower case 5. Figure 14(A) is a perspective view of the case 3 as seen from below in the Z direction. Figure 14(B) is a view taken along the arrow AA in Figure 14(A).

[0056] 11(A), the lower case 5 has a bottom wall portion 50 that is perpendicular to the straight line Lz, and a peripheral wall portion 55 that surrounds the outer periphery of the bottom wall portion 50. The peripheral wall portion 55 protrudes upward from the bottom wall portion 50 in the direction of the straight line Lz.

[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), peripheral wall 55 has side walls 51 and 52 that face each other in the X direction with grill section 502 therebetween, and side walls 53 and 54 that face each other in the Y direction with grill section 502 therebetween.

[0059] As shown in FIG. 12A, the side wall 51 has a base 510 connected to the bottom wall 50. The base 510 is provided over the entire length of the bottom wall 50 in the Y direction. A protruding wall 511 protruding upward in the direction of the straight line Lz is provided on an upper surface 510a (joint surface) of the base 510. The protruding wall 511 is provided with an engagement hole 511a penetrating the protruding wall 511. Note that, as shown in FIG. 11A, the side wall 52 has a shape symmetrical to the side wall 51 with the grill portion 502 interposed therebetween. The side wall 52 also has a base 520 connected to the bottom wall 50 and a protruding wall 521 protruding from the base 520. The protruding wall 521 is provided with an engagement hole 521a penetrating therethrough.

[0060] 11A, the side wall portion 54 has a notch 545 formed in the center in the X direction. The notch 545 is provided over the entire length of the side wall portion 54 in the direction of the straight line Lz. The side wall portion 54 has engagement holes 54a, 54a penetrating the side wall portion 54 on the sides of the side wall portion 51 and the side wall portion 52 that sandwich the notch 545.

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

[0062] As shown in Fig. 12(A), a lid portion 56 is provided below the side wall portion 54 across 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] 11A and 11B, side wall 53 is composed of three walls spaced apart in the X direction. Specifically, side wall 53 has a protruding wall 531 connected to side wall 51, a protruding wall 532 connected to side wall 52, and a protruding wall 533 disposed between protruding walls 531 and 532. As shown in FIG. 12B, protruding walls 531 and 532 are provided with engagement holes 531a and 532a that penetrate protruding walls 531 and 532, respectively.

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

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

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

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

[0068] 12A, a step portion 535 is provided at the upper end of the protruding wall 533 by partially cutting away the protruding wall 533. Specifically, the step portion 535 has a first step surface 535a connected to the third side surface 533a and a second step surface 535b connecting the first step surface 535a and the inner circumferential surface 533d. The first step surface 535a is a flat surface parallel to the straight line Lz. The second step surface 535b is a flat surface perpendicular to the straight line Lz.

[0069] When the opening 45 is closed by the protruding wall 533, the third side surface 533a of the protruding wall 533 faces the third side surface 453 of the opening 45 in the direction of the straight line Lz. The second step surface 535b of the step portion 535 faces the bottom surface 42a of the bottom wall portion 42. In addition, the first step surface 535a of the step portion 535 faces the side surface 42c of the bottom wall portion 42 in the Y direction. This forms a sealed structure at the boundary between the bottom wall portion 42 and the protruding wall 533. Therefore, the storage space R surrounded by the upper case 4 and the lower case 5 is unlikely to communicate with the outside in the Y direction (see FIG. 10(C)).

[0070] (Mating wall 7A, 7B) As shown in (B) of FIG. 12, fitting walls 7A and 7B that protrude in directions 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 straight line Lz direction, 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 described above (see (B) of FIG. 8) (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 described above (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. 14A, when the lower case 5 is assembled to the upper case 4 to form the case 3, engagement hole 521a formed in side wall portion 52 of lower case 5 engages with engagement protrusion 417 of side wall portion 412 of the upper case 4. Engagement holes 531a, 532a formed in side wall portion 53 of lower case 5 engage with engagement protrusions 419, 419 of connecting wall portion 413 of the upper case 4. As shown in FIG. 14B, engagement holes 54a, 54a formed in side wall portion 54 engage with engagement protrusions 928, 928 formed in common wall portion 414. In addition, engagement hole 511a (see FIG. 12A) formed in side wall portion 51 of lower case 5 engages with engagement protrusion 417 (see FIG. 5A) of side wall portion 411 of the upper case 4. The opening window 923 of the rear cover 92 is closed by the lid portion 56 of the lower case 5.

[0075] 5B, an upper surface 510a of a base 510 of the lower case 5 and an upper surface 520a of a base 520 thereof abut against first lower end surfaces 415a, 415a of the side wall portions 411, 412 of the upper case 4. Furthermore, upper surfaces 536a, 537a (see FIG. 12B) of connecting walls 536, 537 of the lower case 5 abut against lower end surfaces 46a, 47a (see FIG. 8B) of the peripheral portions 46, 47.

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

[0077] 5B, the second lower end faces 415b, 415b of the side wall portions 411, 412 of the upper case 4 overlap with the base portions 510, 520 of the lower case 5 when viewed from the X direction.

[0078] 10(C), in this embodiment, the opening 45 of the upper case 4 is blocked by inserting the protruding wall 533 of the lower case 5 from below in the Z direction. The fitting wall 7B (see the dashed line in the drawing) is inserted into the recessed groove 6B from the lower end surface 47a side of the peripheral edge portion 47, moves upward in the Z direction, and ultimately faces the third side surface 453 of the opening 45 with a small 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] 12A, the first step surface 535a of the protruding wall 533 overlaps with the step surface 42b of the bottom wall portion 42 of the upper case 4 when viewed from the Y direction.

[0081] As a result, when the case 3 is viewed from the X and Y directions, which are perpendicular to the joining direction (Z direction), the areas around the joint between the upper case 4 and the lower case 5 overlap each other, thereby ensuring the sealing of the housing space R of the case 3.

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

[0083] As shown in FIG. 15 , in the speaker section 1, the speaker unit 2 is accommodated in an accommodation space R surrounded by an upper case 4 and a lower case 5. The speaker unit 2 is accommodated in the accommodation space R with the front-to-rear direction of the speaker unit 2 oriented along the 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 accommodated in the accommodation space R between the upper case 4 and the lower case 5 with the diaphragm 201 (cone paper) of the drive unit 20 that forms the front surface facing downward in the 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 unit C2 provided on the printed circuit board 94.

[0084] 6, the support portion 21 of the speaker unit 2 has a flange portion 210 that surrounds the outer periphery 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 passes through the through-hole 211 with the flange portion 210 seated on the seating portion 43 of the upper case 4.

[0085] 15 , when the upper case 4 and the lower case 5 are joined together, 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. The speaker unit 2 is arranged so that portions other than the flange portion 210 are spaced apart from the upper case 4 and the lower case 5 with a gap therebetween.

[0086] When the diaphragm 201 vibrates in response to driving of the driver 20 of the speaker unit 2, a positive-phase sound pressure Sp is generated toward the front side of the diaphragm 201 (the lower side in the direction of the straight line Lz), and an opposite-phase sound pressure Sp' is generated toward the rear side of the diaphragm 201 (the upper side in the direction of the straight line Lz). The positive-phase sound pressure Sp and the opposite-phase sound pressure Sp' each spread spherically from the diaphragm 201. In this embodiment, with the abutment surface P between the flange portion 210 and the lower case 5 as the boundary, the area below the abutment surface P in the direction of the straight line Lz is the area from which the positive-phase sound pressure Sp is generated, and the area above the abutment surface P is the area from which the opposite-phase sound pressure Sp' is generated. Therefore, as shown in FIG. 16, the sound pressure Sp' in the opposite phase acts on substantially the entire surface of the peripheral wall portion 41 of the upper case 4 when viewed from the direction of the straight line Lz.

[0087] Here, the side wall portions 411, 412 and the common wall portion 414 of the peripheral wall portion 41 are continuous walls formed integrally with the rear cover 92, and therefore have high rigidity. Therefore, they are little affected by the action of the opposite-phase sound pressure Sp'. On the other hand, in this embodiment, to ensure 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 configured to be closed by the protruding wall 533 of the lower case 5. Because the protruding wall 533 is separate from the rear cover 92, the rigidity of the protruding wall 533 is lower than that of the side wall portions 411, 412 and the common wall portion 414 of the peripheral wall portion 41. Therefore, they are easily affected by the action of the opposite-phase sound pressure Sp' on the protruding wall 533.

[0088] When the sound pressure Sp' acts on the protruding wall 533, the protruding wall 533 is displaced away from the speaker unit 2, forming a gap between the protruding wall 533 and the opening 45, which may result in sound leakage. The sound leaking from the gap between the protruding wall 533 and the opening 45 is an antiphase sound, which weakens the positive phase sound. Furthermore, if the antiphase sound is perceived by the user, it will cause the user to feel uncomfortable. Furthermore, 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. If the vibration of the protruding wall 533 propagates throughout the case 3, chatter may occur in the case 3. The chatter sound of the case 3 will also cause the user to feel uncomfortable. In contrast to these problems, for example, if the connecting wall portion 413 is not provided with the opening 45 and is made a wall portion continuous with the side walls 411, 412, the rigidity strength against the sound pressure Sp' is ensured, and sound leakage and chattering are suppressed. However, this leads to a decrease in the ease of assembling the rear cover 92, since there is no working space for threading the bolts Bc (see FIG. 4).

[0089] Therefore, in this embodiment, the case structure 100 is provided with the recessed grooves 6A, 6B and the fitting walls 7A, 7B that fit into each other in the opening 45 and the protruding wall 533. 16, when an antiphase sound pressure Sp' acts on inner peripheral surface 533d of protruding wall 533, pushing protruding wall 533 in the Y direction away from speaker unit 2 (black arrow in the enlarged area of ​​FIG. 16), side surfaces 71, 71 of fitting walls 7A, 7B are pressed against groove walls 62, 62 of recessed grooves 6A, 6B, respectively. At this time, a reaction force acts on side surfaces 71, 71 of fitting walls 7A, 7B from groove walls 62, 62 of recessed grooves 6A, 6B, respectively (white arrow in the enlarged area of ​​FIG. 16).

[0090] As a result, the pressing force due to the sound pressure Sp' and the reaction force from the recessed grooves 6A and 6B are balanced, reducing the displacement of the protruding wall 533 in a direction away from the speaker unit 2. Therefore, the case structure 100 according to this embodiment can ensure a working space, suppress sound leakage, and suppress chatter.

[0091] Furthermore, in the case structure 100 according to this embodiment, a rib 65 is provided on the groove wall 63 side of the grooves 6A and 6B. This allows the side surfaces 72 and 72 of the fitting walls 7A and 7B to also abut against the rib 65. As a result, the fitting walls 7A and 7B are supported by the grooves 6A and 6B from both sides in the Y direction. This reduces rattling of the fitting walls 7A and 7B within the grooves 6A and 6B that occurs in response to changes in the sound pressure Sp'.

[0092] In this case, it is also possible to simply narrow the gap W6 (see FIG. 9 ) between the groove walls 62 and 63 without providing the rib 65. However, the fitting walls 7A and 7B would be in surface contact with both the groove walls 62 and 63 of the recessed grooves 6A and 6B. This would increase resistance when inserting the fitting walls 7A and 7B into the recessed grooves 6A and 6B, affecting workability. Therefore, by providing the rib 65 that narrows the gap between the groove walls 62 and 63 as in the present application, the fitting walls 7A and 7B on the sides that contact the rib 65 are in line contact, thereby reducing resistance during insertion. Therefore, the fitting walls 7A and 7B can be inserted into the recessed grooves 6A and 6B with less force, improving workability.

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

[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 an opening 45 is formed in the peripheral wall 41 that covers the speaker unit 2, simply closing the opening 45 with the protruding wall 533 may result in a gap being created between the protruding wall 533 and the opening 45 when the sound pressures Sp and Sp' (especially the sound pressure Sp') act, which may cause sound leakage. Furthermore, the sound pressure Sp' may cause the protruding wall 533 to vibrate, which may cause chatter in the case 3 itself, making it impossible to ensure the required sound pressure. Therefore, with the above configuration, even if sound pressure acts on protruding wall 533, fitting walls 7A and 7B are fitted into recessed grooves 6A and 6B, so that a reaction force in a direction against sound pressure Sp' is generated in protruding wall 533. As a result, vibration of protruding wall 533 is suppressed, and a gap is less likely to occur between protruding wall 533 and opening 45. This keeps opening 45 closed by protruding wall 533, thereby suppressing sound leakage and chattering of case 3.

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

[0096] With this configuration, it is possible to reduce rattling of the protruding wall 533 within the recessed grooves 6A and 6B. Here, it is also possible to simply reduce the groove width W6 (see FIG. 9) without providing the rib 65. However, the fitting walls 7A, 7B would be in surface contact with both the groove walls 62, 63 of the recessed grooves 6A, 6B. This would increase the resistance when inserting the fitting walls 7A, 7B into the recessed grooves 6A, 6B, affecting the ease of assembly of the lower case 5 to the upper case 4. Therefore, by configuring as described above and providing ribs 65 in the recessed grooves 6A and 6B, the side of the protruding wall 533 that comes into contact with the ribs 65 is in line contact, which reduces resistance during insertion and improves 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 along the front-rear direction of the speaker unit 2. The lower case 5 is attached to the upper case 4 from the diaphragm 201 side (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 opposite phase side of the sound emitted from the speaker unit 2.

[0098] In the spherically spreading sound pressures Sp, Sp', if sound having anti-phase sound pressure Sp' leaks to the outside and interferes with the positive phase sound pressure Sp, it may affect the sound perceived by the user. Therefore, by configuring as described above, it is possible to reduce the leakage of sound having the opposite phase sound pressure Sp' to the outside of the case 3, thereby reducing 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 recessed grooves 6A and 6B are located on both sides of the opening 45 in the X direction (width direction).

[0100] With this configuration, the supporting stability of the protruding wall 533 against 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 the above (1) to (4), (5) A rear cover 92 (third housing) is provided with a switch device 9 electrically connected to the speaker unit 2, The peripheral wall portion 41 of the upper case 4 shares an area located on the opposite side of the opening 45 in the direction of the straight line Ly with the rear cover 92 . A common wall portion 414, which is an area of ​​the peripheral wall portion 41 shared with the rear cover 92, is provided with a countersunk hole 921c (second opening) for accessing the inside of the rear cover 92 from the opening portion 45 side.

[0102] With this configuration, when assembling the switch device 9, the opening 45 can be used as a working space for accessing the counterbore 921c. This allows the switch device 9 to achieve both improved workability and reduced sound leakage.

[0103] (Variation) FIG. 17 is a diagram illustrating a case structure 100A according to a modified example. In the present embodiment, the recessed grooves 6A and 6B are provided on the periphery of the opening 45 of the upper case 4, and the fitting walls 7A and 7B are provided on the periphery of the protruding wall 533 of the lower case 5. However, the present invention is not limited to this embodiment.

[0104] 17, mating walls 7A', 7B' may be provided on the opening 45A side of the upper case 4A, and recessed grooves 6A', 6B' may be provided on the protruding wall 533A side of the lower case 5A. In a case structure 100A according to a modified example, ribs 75, 75 are provided on side surfaces 72', 72' of the mating walls 7A', 7B'. That is, in the case structure 100A according to the modified example, the fitting walls 7A' and 7B' form the peripheral edge of the opening 45A. Also, the area of ​​the protruding wall 533A surrounding the recessed grooves 6A' and 6B' forms the peripheral edge of the protruding wall 533A.

[0105] In this case, an antiphase sound pressure Sp' acts on the inner peripheral surface 533d of the protruding wall 533A, pushing the protruding wall 533A in the Y direction away from the speaker unit 2 (shown by the black arrow in the enlarged area of ​​FIG. 17). As a result, the groove walls 63', 63' of the recessed grooves 6A', 6B' are pressed against 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 recessed grooves 6A', 6B' from the side surfaces 71', 71' of the fitting walls 7A', 7B' (shown by the white arrow in the enlarged area of ​​FIG. 17).

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

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

[0108] This configuration also makes it possible to secure a working space and suppress sound leakage at the same time.

[0109] Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to these and can be modified as appropriate within the scope of the technical concept of the invention. [Explanation of symbols]

[0110] 1. Speaker section 2 speaker units 3 cases 4 Upper Case 5 Lower case 6A, 6B Concave groove 7A, 7B Fitting wall (periphery) 9 Switching Device 41 Peripheral wall (wall) 45 Opening (first opening) 46 Periphery 46a Lower end surface (joint surface) 47 Periphery 47a Lower end surface (joint surface) 65 Ribs 91 Operation Panel 92 Back cover (third housing) 100 Case Structure 413 Connecting wall 414 Shared Wall (area in wall shared with third enclosure) 533 Projecting wall 921c Counterbore (second opening) Bc bolt Sp Positive phase sound pressure Sp' antiphase sound pressure Lx straight line Ly Line (second direction) Lz Straight line (first direction)

Claims

1. A case structure for a case that houses a speaker unit, the case has a first housing and a second housing assembled to each other in a first direction; In the first housing, a wall portion covering the speaker unit has a first opening portion that communicates the inside and outside of the wall portion and that extends to a 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 recessed groove into which the other peripheral edge portion is inserted is provided in one peripheral edge portion of the protruding wall and the first opening; a third housing provided with a switch electrically connected to the speaker unit; a region of the wall portion of the first housing that is located on an opposite side 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 is provided in an area of ​​the wall portion shared with the third housing, for accessing the inside of the third housing from the side of the first opening.

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

3. In claim 1, the first direction is a direction along a front-rear direction of the speaker unit, the second housing is attached 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 opposite phase side of the sound emitted from the speaker unit.

4. In claim 1, A case structure characterized in that, when viewed from a second direction perpendicular to the first direction, the recessed grooves are located on both sides of the first opening in the width direction.

Images