JP4541130B2 - instrument panel - Google Patents

Description

  The present invention relates to an instrument panel that covers an airbag.

Conventionally, the technique of the instrument panel which covers an airbag door is well-known.
For example, in the airbag door mounting structure disclosed in Patent Document 1, the airbag door is bent outward as the airbag is inflated, thereby releasing the fixing by the claw provided at the end of the airbag door. . The deployed airbag door is supported by a hinge band.
Moreover, the hinge apparatus of the airbag door currently disclosed by patent document 2 is as follows. That is, the hinge bracket which makes a pair with the airbag door which is a part of instrument panel and instrument panel is provided. One of the hinge brackets has a hinge pin, and the other has a long hole connected to the hinge pin. An air bag door is pivotally attached to the hinge pin and the long hole.
Japanese Patent Laid-Open No. 7-81510 (Refer to 0004, 0005, and FIG. 1 regarding airbag door deployment) Japanese Utility Model Laid-Open No. 3-107367 (see the scope of the utility model registration request and FIG. 2 regarding the structure of the hinge device)

However, in the configuration disclosed in Patent Document 1, it is necessary to bend the airbag door in order to release the claw for fixing the airbag provided at the end portion of the airbag door. by. Accordingly, not only the deployment of the airbag is obstructed structurally, but the claw and the hinge band are required, so that the number of parts is increased and the configuration is complicated.
Further, in the configuration disclosed in Patent Document 2, a pair of hinge brackets having a hinge pin and a long hole to which the hinge pin is connected are required to rotate the airbag door. Therefore, the number of parts increases and the configuration becomes complicated.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

The first invention, and the instrument panel body forming a readily breakable line so that an opening is formed at a predetermined region when the airbag deployment, the instrument panel body Guyo extend over the inside and outside of the region an airbag door that will be placed I line with, comprising a main body which rotates when the air bag deployment, and a formed protrusion so as to protrude to the outside of the region from the body, the body is the While being fixed to the back surface of the instrument panel main body, the protruding portion is slidably attached to the center of the opening along the instrument panel main body without being fixed to the back surface of the instrument panel main body . an air bag door, and an air bag case attached to the back surface of the instrument panel main body, a slide-friendly the projecting portion And an air bag case provided with a recess capable of housing the, wherein the thickness of the protrusion is smaller than the depth of the recess, a instrument panel.

With this configuration, when the airbag is deployed, the airbag door rotates in the airbag inflating direction while bending the boundary portion of the region, but at the same time, the outer portion of the region slides, so that the folded portion is excessive. Power is not applied. Therefore, the airbag door can be reliably opened by a sufficient angle so as not to hinder the deployment of the airbag, and at the same time, breakage of the bent portion can be prevented. Further, with this configuration, since the airbag is rotated while bending the protruding portion, the airbag can be rotated with a small force and hardly resists the deployment of the airbag. Moreover, the said function is realizable with the simple structure of a protrusion part and a recessed part. Further, with this configuration, a gap can be formed between the protruding portion and the recessed portion, so that the sliding movement between the protruding portion and the recessed portion can be performed smoothly.

The second invention is the instrument panel according to the first invention, wherein the depth of the recess is larger than the thickness of the fixing portion of the airbag case to the instrument panel.

  With this configuration, a sufficiently large depth of the recess can be ensured, so that the airbag case can be easily fixed to the instrument panel (for example, using vibration welding) in a state where the protrusion is housed in the recess.

3rd invention is an instrument panel as described in 1st or 2nd invention , Comprising: If the said protrusion part displaces in the direction which pulls out from the said recessed part at the time of airbag deployment, the displacement beyond it will be controlled. It is characterized by doing.

  With this configuration, it is possible to prevent the airbag door from being detached from the instrument panel when the airbag is deployed.

4th invention is an instrument panel of 3rd invention, Comprising: The said control is performed by the taper engagement of the said protrusion part and the said recessed part, It is characterized by the above-mentioned.

  With this configuration, the protrusion and the concave portion are taper-engaged so that the restriction of the protrusion on the slide is gradually increased. Therefore, it is possible to prevent an excessive force from being instantaneously applied to the protruding portion and the bent portion, and to reliably prevent the protruding portion from being removed from the recess and the airbag door from being released. Moreover, since the said effect is achieved only by determining each shape so that a protrusion part and a recessed part may carry out taper engagement, a structure can be simplified.

A fifth invention is an instrument panel according to the third or fourth invention, wherein the protruding portion and the concave portion are formed in a shape that narrows the width as approaching the boundary of the region. .

  With this configuration, the configuration can be simplified.

  Next, an embodiment of an instrument panel according to the present invention will be described with reference to the drawings. Here, an instrument panel provided in front of the passenger seat in the automobile interior will be described.

FIG. 1 shows an exploded perspective view of an instrument panel according to an embodiment of the present invention.
FIG. 2 shows a top view of an airbag case of an instrument panel according to an embodiment of the present invention.
FIG. 3 is a top view of the airbag door of the instrument panel according to the embodiment of the present invention.
FIG. 4 is a partial top view of the hinge portion of the instrument panel according to the embodiment of the present invention.
FIG. 5 shows a partial cross-sectional view of the hinge portion of the instrument panel according to the embodiment of the present invention.
6 shows a cross-sectional view of the airbag case shown in FIG.
FIG. 7 is a cross-sectional view of the airbag case shown in FIG.
FIG. 8 is a cross-sectional view of a modification of the airbag case, and shows one corresponding to FIG.
FIG. 9 is an overall view of an automobile dashboard in which an instrument panel according to an embodiment of the present invention is provided in a passenger seat.

  First, the outline of the configuration of the instrument panel 1 according to the present embodiment will be described with reference to FIG.

  The instrument panel 1 according to the present embodiment is provided in front of the passenger seat of an automobile and is formed as a part of the dashboard 100. The instrument panel 1 is configured such that the presence of an airbag case or the like cannot be identified from the occupant due to a request for an aesthetic appearance.

  Next, the general configuration of the instrument panel 1 will be described with reference to FIGS. 1 to 3. However, FIG. 1 is a view seen from the back side of the dashboard 100.

  The instrument panel 1 is roughly composed of the following elements. That is, the instrument panel body 2, the airbag case 3 that is attached to the back surface of the instrument panel body 2, and stores the airbag, and the airbag that rotates a predetermined region of the instrument panel body 2 when the airbag is deployed. And a door 4.

  Next, each element will be described in more detail.

  The instrument panel main body 2 has a through-opening region 2a that opens when the airbag is deployed. In addition, an easy break line 2b for opening the through opening region 2a and an easy break center line 2c that allows the through opening region 2a to be opened more quickly are provided.

  The through-opening region 2a opens when the airbag is deployed, but the region is substantially rectangular, and has a sufficient area so that the airbag stored in the airbag case 3 can be deployed without delay. .

  The breakable line 2b is for opening the through-opening region 2a, but is provided at the outer edge of the through-opening region 2a.

  The easily breakable center line 2c allows the through-opening region 2a to be opened more quickly, but is a single line that substantially bisects the area of the through-opening region 2a.

  The through-opening region 2a or the easily breakable center line 2c is, for example, a V-shaped groove, and may be formed on the back surface of the instrument panel body 2, that is, a surface that cannot be seen from the living space of the automobile. Alternatively, for example, a small number of through holes that are not normally visible to an occupant and may be formed at appropriate intervals along the line.

  The airbag case 3 is attached to the back surface of the instrument panel body 2 and stores the airbag. More specifically, the airbag case 3 includes a case wall 3a that forms a space for storing the airbag, and the airbag case 3. Is mounted on the back surface of the instrument panel body 2, a recess 3c that slidably accommodates a portion of the airbag door 4 and outside the through opening region 2a, and the airbag is deployed. And an opening 3d for the purpose.

  The case wall 3a forms a space for storing the airbag, but protrudes along the opening 3d in a direction away from the passenger, and the space surrounded by the case wall 3a is a substantially rectangular parallelepiped. ing.

  The attachment plate 3b is for attaching the airbag case 3 to the back surface of the instrument panel main body 2, and is formed in a substantially rectangular shape so as to surround the opening 3d, and one surface thereof is attached to the instrument panel main body 2. A mounting surface 3e is formed. There are various attachment methods, and for example, fastening elements such as bolts and nuts may be used, or a suitable adhesive may be used. In the present embodiment, both are fixed by vibration welding because of a demand on the appearance of the instrument panel 1 and a demand for cost reduction.

  The recess 3c is a part of the airbag door 4 and slidably accommodates a portion outside the through-opening region 2a, but a plurality of recesses 3c are provided on a pair of opposing sides of the mounting surface 3e. The shape and size will be described later.

  The opening 3d is provided on the mounting plate 3b for deployment of the airbag, but its shape and area substantially coincide with those of the through-opening region 2a surrounded by the breakable line 2b of the instrument panel body 2. Yes.

  The airbag door 4 is for rotating the through-opening region 2a of the instrument panel main body 2 when the airbag is deployed, and is disposed across the inside and the outside of the through-opening region 2a. More specifically, the airbag door 4 is composed of a door body 4a that rotates together with the through-opening region 2a of the instrument panel body 2 when the airbag is deployed, and a protrusion 4b that is slidably housed in the recess 3c. ing. Here, two airbag doors 4 are separately provided so as to sandwich the easy-to-break center line 2c so that the through-opening region 2a can be separated from the easy-to-break center line 2c. A suitable door gap 4c is formed between them.

  The door body 4a rotates together with the through-opening region 2a of the instrument panel body 2 when the airbag is deployed, but is fixed to the back surface of the through-opening region 2a. Although there are various fixing methods, vibration welding is applied in the present embodiment.

  The projecting portion 4b is formed so as to be slidably accommodated in the recess 3c, and a plurality of the projecting portions 4b project from the door body 4a toward the outside of the through-opening region 2a. The shape and size will be described later.

  Next, the recessed portion 3c of the airbag case 3, the protruding portion 4b of the airbag door 4, and the hinge portion 40 that is the rotation center of the door body 4a will be described in more detail with reference to FIGS.

  Here, based on the drawing on the left side of FIG. 4, the loosely mounted state of the recessed portion 3 c and the protruding portion 4 b as viewed from the back side of the instrument panel 1 will be described.

  The width of the inner wall of the recess 3c is formed so as to become narrower from the outer periphery of the mounting plate 3b toward the inner periphery. Similarly, the width of the protruding portion 4b is formed so as to become narrower in the same direction, and is substantially accommodated in the concave portion 3c. Further, the width of the protrusion 4b is slightly narrower over the entire area than the width of the inner wall of the recess 3c, and a suitable gap 34 is formed between the two, and the gap 34 is constant over the entire area. By providing such a gap 34, the protrusion 4b can slide in the removal direction from the recess 3c.

  However, when the airbag is deployed and the door body 4a rotates, as shown in the drawing on the right side of FIG. 4, the protruding portion 4b slides out of the recess 3c, but the airbag door 4 is mounted on the instrument panel. In order to prevent deviation from 1, it is necessary to restrict further sliding when a predetermined amount (distance d on the right side of FIG. 4) slides. Therefore, the width of the gap 34 is suitably determined so that the protrusion 4b and the recess 3c are taper-engaged when the predetermined amount is slid and further sliding in the removal direction is restricted. To put it simply, for example, the widest portion (tip portion) of the protrusion 4b is configured to be wider than the narrowest portion of the recess 3c.

As described above, the protrusion 4b is loosely slidably mounted in the recess 3c, and when it slides a predetermined amount in the removal direction, the protrusion 4b and the recess 3c are taper-engaged and further sliding is restricted. Thus, the following effects are obtained.
That is, when the airbag is deployed, the airbag door 4 rotates in the airbag inflating direction while bending the boundary portion of the through-opening region 2a. However, since the protruding portion 4b slides at the same time, excessive force is applied to the bent portion. Is not added. Therefore, the airbag door 4 can be surely opened by a sufficient angle so as not to hinder the deployment of the airbag, and at the same time, breakage of the bent portion can be prevented.

  Here, based on FIG. 6 and FIG. 7, the loosely-mounted state of the recessed part 3c and the protrusion part 4b seen from the cut surface of the instrument panel 1 is demonstrated.

  As described above, a plurality of the recesses 3c are arranged in parallel on the pair of attachment surfaces 3e of the attachment plate 3b. The depth of the recess 3c is formed larger than the thickness of the mounting plate 3b (in FIG. 6, a represents the thickness of the mounting plate 3b and b represents the depth of the recess 3c). The protrusion 4b is formed so that the thickness of the protrusion 4b accommodated in the recess 3c is smaller than the depth of the recess 3c (in FIG. 7, b is the depth of the recess 3c, and c is the depth of the protrusion 4b). The gap 35 is provided between the protrusion 4b and the instrument panel body 2 and between the protrusion 4b and the recess 3c.

  On the other hand, since the door body 4a is vibration welded to the through-opening region 2a, no gap is required between them. Therefore, the door main body 4a and the protrusion 4b constituting the airbag door 4 are not on the same plane.

  The above configuration has the following effects. That is, due to the gap 35, the protrusion 4b can smoothly slide in the removal direction. Further, when the door main body 4a and the through-opening region 2a, or the attachment plate 3b and the instrument panel main body 2 are welded by vibration welding, the protrusion 4b and the recess 3c, and the protrusion 4b and the instrument panel. It is possible to prevent the main body 2 from being welded against the intention.

  The hinge part 40 shown in FIG. 4 is provided with the recessed part 3c and the protrusion part 4b which were demonstrated above, and also has the breakable line 2b previously. Accordingly, the through-opening region 2a can be rotated without delay when the airbag is deployed, and can be smoothly rotated to a necessary and sufficient angle (for example, 180 degrees).

  In addition, a gap 36 is formed between the door body 4a and the mounting plate 3b. This can reduce the processing accuracy requirements for the inner peripheral surface of the mounting plate 3b and the outer peripheral surface of the door main body 4a. it can. Further, by providing the gap 36, the attachment plate 3b and the door main body are unexpectedly welded when the door main body 4a and the through-opening region 2a or the attachment plate 3b and the instrument panel main body 2 are welded by vibration welding. It also has an effect of preventing 4a from being welded.

  By the way, the aesthetic appearance of the instrument panel 1 according to the present embodiment will be described. That is, in order to maintain the aesthetic appearance of the front side, that is, the passenger side of the instrument panel 1 according to the present embodiment provided in front of the passenger seat of the dashboard 100 shown in FIG. 9, it is formed as follows.

First, the airbag case 3 is attached to the back surface of the instrument panel body 2.
Secondly, vibration welding is used as means for attaching the airbag case 3 to the instrument panel body 2.
Thirdly, it is formed so that an appropriate process such as a groove or a minute through hole forming the easy breakable line 2b or the easy breakable center line 2c for opening the through opening region 2a of the instrument panel body 2 cannot be seen by the passenger. Yes.
As described above, the presence of an airbag for an occupant riding in the passenger seat is configured so that it cannot be easily identified by the occupant, and does not impair the aesthetic appearance of the dashboard 100 that is an interior component.

  With the above configuration, the instrument panel 1 according to the present embodiment has the following effects.

  In the instrument panel 1 according to the present embodiment, an instrument panel body 2 in which an easy breakable line 2b and an easy breakable centerline 2c are formed so that an opening is formed in the through opening region 2a when the airbag is deployed, and the instrument panel The airbag case 3 attached to the back surface of the main body 2 and the inner side and the outer side of the through-opening region 2a are arranged across the outer opening portion (projecting part 4b) on the back surface of the instrument panel main body 2. The airbag door 4 is attached to the airbag case 3 so as to be slidable in a linear direction without being fixed, while the inner portion (door body 4a) of the through-opening region 2a is fixed to the back surface of the instrument panel body 2. And.

  Thus, when the airbag is deployed, the airbag door 4 rotates in the airbag inflating direction while bending the boundary portion of the through-opening region 2a, but at the same time, the portion outside the through-opening region 2a (protruding portion 4b) As it slides, excessive force is not applied to the bent part. Therefore, the airbag door 4 can be surely opened by a sufficient angle so as not to hinder the deployment of the airbag, and at the same time, breakage of the bent portion can be prevented.

  The airbag door 4 includes a door body 4a that rotates when the airbag is deployed, and a protruding portion 4b that is formed to protrude from the airbag door 4 to the outside of the through-opening region 2a. Is provided with a recess 3c in which the protrusion 4b can be slidably accommodated.

  Thereby, since it is the structure which turns while an airbag bends the part of the protrusion part 4b, it can be rotated with a small force and it becomes difficult to become resistance with respect to deployment of an airbag. Moreover, the said function is realizable with the simple structure of the protrusion part 4b and the recessed part 3c.

  The thickness of the protrusion 4b is smaller than the depth of the recess 3c.

  Thereby, since a clearance gap can be formed between the protrusion part 4b and the recessed part 3c, the sliding movement of the protrusion part 4b and the recessed part 3c is made smoothly.

  The depth of the recessed part 3c is larger than the thickness of the fixed part to the instrument panel 1 of the airbag case 3. FIG.

  As a result, the depth of the recess 3c can be secured sufficiently large, so that the airbag case 3 can be easily fixed to the instrument panel body 2 (for example, using vibration welding) in a state where the protrusion 4b is housed in the recess 3c. it can.

  When the protrusion 4b is displaced by a predetermined amount in the direction in which the protrusion 4b is removed from the recess 3c when the airbag is deployed, further displacement is restricted.

  Thereby, it can prevent that the airbag door 4 remove | deviates from the instrument panel 1 at the time of airbag deployment.

  The restriction is performed by the taper engagement between the protrusion 4b and the recess 3c.

  Since the protrusion 4b and the recess 3c are taper-engaged, a restriction on the slide of the protrusion 4b can be gradually increased. Accordingly, it is possible to prevent an excessive force from being instantaneously applied to the protruding portion 4b and the bent portion, and to reliably prevent the protruding portion 4b from being detached from the recess 3c and the airbag door 4 from being removed. Moreover, since the said effect is achieved only by determining each shape so that the protrusion part 4b and the recessed part 3c may taper-engage, a structure can be simplified.

  The protrusion 4b and / or the recess 3c are formed in a shape that narrows the width as it approaches the boundary of the through-opening region 2a.

  Thereby, a structure can be simplified.

  Next, based on FIG. 4 thru | or FIG. 9, the action | operation of the instrument panel 1 which concerns on this embodiment is demonstrated.

  First, the instrument panel 1 before airbag deployment will be described.

As shown in the drawing on the left side of FIG. 4, in the surface direction, the protrusion 4b is substantially accommodated in the recess 3c, and a suitable gap 34 is formed between the inner wall of the recess 3c and the protrusion 4b. .
As shown in the drawing on the left side of FIG. 5, in the thickness direction, the protrusion 4b is substantially accommodated in the recess 3c, and the inner wall of the recess 3c, the protrusion 4b, and the protrusion 4b and the instrument panel main body 2 A suitable gap 35 is formed between them.
Thereby, the protrusion part 4b is standing by in the state which can be slid in the removal direction from the recessed part 3c.

  Next, the instrument panel 1 when the airbag is deployed will be described.

  An outline of the operation of the instrument panel 1 when the airbag is deployed is as follows. That is, the airbag stored in the airbag case 3 in advance in FIG. 7 is inflated when the automobile collides with an obstacle, for example, and opens the instrument panel body 2 covering the airbag accordingly. More specifically, the through-opening region 2a of the instrument panel body 2 is rotated in a double-opening direction toward the interior of the automobile with the hinge portion 40 as the center of rotation with the easy-to-break center line 2c as a boundary.

  The right side of the drawing of FIG. 5 shows the state of the opening of the through-opening region 2a when the airbag is deployed. More specifically, the operation of the hinge portion 40 is shown. When the airbag is deployed, the door body 4a that is vibration welded to the through-opening region 2a due to the inflation of the airbag is first pressurized from the back side of the instrument panel 1. Next, the easy break center line 2c and the easy break line 2b break. Next, the protruding portion 4b starts to slide out from the recess 3c, and the through-opening region 2a starts to rotate around the hinge portion 40 substantially at the same time.

  As described above, since the projecting portion 4b can slide in the recess 3c by a predetermined amount of displacement, the hinge portion 40 opens through to a sufficient angle (for example, 180 degrees) without delay in deployment of the airbag. The region 2a and the door body 4a welded to the region 2a can be rotated. Moreover, since an excessive force is not added to the bending part around the base end of the protrusion part 4b by this, the fracture | rupture of this bending part can be prevented. Moreover, since the shape of the protrusion part 4b and the recessed part 3c is determined so that the slide beyond that when a predetermined amount is slid, the protrusion part 4b can be prevented from being detached from the recessed part 3c. In addition, since taper engagement is used as a means for restricting the removal of the protruding portion 4b, the restriction can be performed gently, thereby preventing breakage or cracking at the proximal end of the protruding portion 4b. be able to.

  As described above, the instrument panel 1 according to the present embodiment has the through-opening region 2a formed by the hinge portion 40 including the concave portion 3c and the protruding portion 4b that is slidably accommodated in the concave portion 3c. The opening can be sufficiently made without delay, and breakage of the bent portion around the base end of the protrusion 4b can be prevented. Note that the present invention is not limited to this, and can be freely designed within the scope of the present invention.

  In the present embodiment, the cross-sectional shape of the recess 3c is rectangular as shown in FIG. 6 but is not limited to this. For example, as shown in FIG. 8, the width thereof becomes narrower toward the instrument panel body 2. It may be a trapezoid. As a result, when the through-opening region 2a rotates, the concave wall 3c and the protruding portion 4b can be more gently taper-engaged by the inclined inner wall of the concave portion 3c, and the base end of the protruding portion 4b can be more reliably secured. The peripheral breakage can be prevented.

  Further, the easy break line 2b is cracked when the airbag is deployed, and the instrument panel main body 2 and the through opening region 2a can be separated from each other. However, the crack may be completely broken, or the door main body 4a Partial breakage may be used as long as rotation is not hindered.

  In FIG. 4, the gap 34 provided between the protrusion 4 b and the recess 3 c is constant over the entire area. However, the present invention is not limited to this, and the inner peripheral side of the mounting plate 3 b is slightly narrowed, while the outer peripheral side. May be provided to be slightly wider. Alternatively, the inner peripheral side of the mounting plate 3b may be slightly widened while the outer peripheral side may be slightly narrowed. Alternatively, the surface on which the gap 34 is formed may have minute irregularities. Alternatively, a suitable elastic material such as rubber may be provided in the gap 34 to such an extent that the slide is not hindered. Thereby, the protrusion part 4b can taper-engage with the recessed part 3c more gently, and the fracture | rupture of the bending part around the base end of the protrusion part 4b can be prevented more reliably.

The disassembled perspective view of the instrument panel which concerns on one Embodiment of this invention. The top view of the airbag case of the instrument panel which concerns on one Embodiment of this invention. The top view of the airbag door of the instrument panel which concerns on one Embodiment of this invention. The partial top view of the hinge part of the instrument panel which concerns on one Embodiment of this invention. The fragmentary sectional view of the hinge part of the instrument panel concerning one embodiment of the present invention. FIG. 3 is a cross-sectional view of the airbag case taken along the line AA in FIG. 2. BB sectional drawing of the airbag case shown in FIG. It is sectional drawing of the modification of an airbag case, and respond | corresponds with FIG. 1 is an overall view of an automobile dashboard in which an instrument panel according to an embodiment of the present invention is provided in a passenger seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Instrument panel 2 Instrument panel main body 3 Airbag case 3c Recessed part 4 Airbag door 4b Protrusion part 40 Hinge part

Claims (5)

An instrument panel main body formed with an easy-to-break line so that an opening is formed in a predetermined area when the airbag is deployed;
A said instrument panel air bag door that will be placed I along the body Guyo extend over the inside and outside of the region, projecting a body which rotates when the air bag deployment, from the body to the outside of the area And the main body is fixed to the back surface of the instrument panel main body, while the protrusion is not fixed to the back surface of the instrument panel main body. slidably mounted toward the center of the opening along the air bag door,
An airbag case attached to the back surface of the instrument panel body, the airbag case including a recess capable of slidably storing the protruding portion;
Equipped with a,
You, wherein the thickness of the protrusion is smaller than the depth of the recess, the instrument panel. An instrument panel according to claim 1 ,
The depth of the said recessed part is larger than the thickness of the fixed part to the said instrument panel of the said airbag case, The instrument panel characterized by the above-mentioned. An instrument panel according to claim 1 or 2 ,
An instrument panel that restricts further displacement when the protruding portion is displaced by a predetermined amount in a direction in which the protruding portion is withdrawn from the recess when the airbag is deployed. 4. The instrument panel according to claim 3 , wherein the restriction is performed by taper engagement between the protrusion and the recess. 5. 5. The instrument panel according to claim 3 , wherein the protrusion and the recess are formed in a shape that decreases in width as approaching a boundary of the region.

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