JP2006309835A - Attaching structure of baked ceramic plate, and portable electronic device using this structure, and portable audio device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure to attach a baked ceramic plate capable of withstanding impacts applied when dropped or collided with other objects and obtaining a stateliness, high-end, or novel appearance. <P>SOLUTION: The case 12 of an MD player 10 has a case body 14 and a lid 16. Attaching sections 20 are formed on all over the lower surface 1402 of the case body 14 and the top surface 1602 of the lid 16. A baked ceramic plate 30 is attached to the attaching section 20. The attaching section 20 is formed with a bottom walls 22, and side walls 24. The surface 3002 of the baked ceramic plates 30 is formed as a deep mirror decorative surface by diamond polishing to effectively show their own zirconia color. The baked ceramic plate 30 is attached to the bottom 22 by using a double-sided adhesive tape 40 which has an elastic back surface 3004 while securing gaps S between the sides of the ceramic plate 30 and the side walls 24. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ceramic fired plate mounting structure, and a portable electronic device and a portable audio device using the mounting structure.

Conventionally, a casing of a portable electronic device such as a portable audio device is configured using a synthetic resin material, or a metal material such as an aluminum alloy or stainless steel.
Then, the following processing is performed to give a sense of quality and novelty.
When the casing is made of a synthetic resin material, the surface is shined with a hologram or the like, or the surface is subjected to a finishing process such as gloss plating or painting.
In addition, when the casing is made of a metal material, for example, an alumite treatment is applied in the case of an aluminum alloy, or a gloss or matte finish is applied in the case of a stainless steel. We are processing.
JP2002-262197 JP 2003-89882 A JP 2003-258446 A

However, when a synthetic resin material is used, a light feeling is inevitably generated due to the characteristics of the material, and a heavy feeling, a high-class feeling, and a novel feeling cannot be produced.
Further, when a metal material is used, the color is not deep and a cold feeling peculiar to the metal is generated, so that a heavy feeling, a high-class feeling, and a novel feeling cannot be obtained.
This is because synthetic resin materials and metal materials are widely used in various fields, and since the materials themselves are general, there is a limit to producing a profound feeling, a high-class feeling, and a novel feeling.
Therefore, it is conceivable to use a ceramic fired plate such as zirconia, sapphire, etc. that has gloss, deep color, resists contamination, and has strength and hardness.
However, such a ceramic fired plate has a property of being easily broken.

Therefore, if a ceramic fired plate with a large thickness is used, it is difficult to break and no problem arises, but the size of the housing is limited to a size within a certain range like a portable audio device, The thickness must be reduced, and the ceramic fired plate is easily broken.
Therefore, when a ceramic fired plate is used for the housing, the thin ceramic fired plate should be able to withstand the impact of falling or colliding with other objects. How to increase the feeling is a very important issue.
The present invention has been made in view of such circumstances, and its purpose is to withstand the impact of a drop or a collision with another object, and to enhance the profound feeling, luxury, and novelty. An object of the present invention is to provide a ceramic fired plate mounting structure that can be mounted.
In addition, the object of the present invention is to use a ceramic fired plate that can withstand impacts when dropped or collides with other objects, and can be mounted with enhanced solidity, luxury and novelty. It is to provide portable electronic devices and portable audio devices.

In order to achieve the above object, the present invention has a structure in which a ceramic fired plate is attached to an attachment portion. The ceramic fired plate has a surface formed as a decorative surface that forms one surface in the thickness direction and a back surface that forms the other surface in the thickness direction. The attachment portion has a bottom wall having a larger contour than the ceramic fired plate and a side wall standing from the periphery of the bottom wall. In the ceramic fired plate, the back surface is attached to the bottom wall with an elastic material interposed in a state where a gap is secured between the periphery of the ceramic fired plate and the side wall.
The present invention is a portable electronic device having a housing. A mounting portion is provided on the surface of the housing. A ceramic fired plate is disposed on the mounting portion. The ceramic fired plate has a surface formed as a decorative surface that forms one surface in the thickness direction and a back surface that forms the other surface in the thickness direction. The attachment portion has a bottom wall having a larger contour than the ceramic fired plate and a side wall standing from the periphery of the bottom wall. In the ceramic fired plate, the back surface is attached to the bottom wall with an elastic material interposed in a state where a gap is secured between the periphery of the ceramic fired plate and the side wall.
The present invention is also a portable audio device having a housing. The housing includes a housing body and a lid body connected to the housing body so as to be openable and closable. The casing main body has a flat plate shape, and one surface in the thickness direction is an inner surface opened and closed by the lid, and the other surface in the thickness direction is a lower surface. The lid body has a flat plate shape, and one surface in the thickness direction is an inner surface that opens and closes the inner surface of the housing body, and the other surface in the thickness direction is an upper surface. A mounting portion is provided over the entire upper surface of the lid. A ceramic fired plate is disposed on the mounting portion. The ceramic fired plate has a surface formed as a decorative surface that forms one surface in the thickness direction and a back surface that forms the other surface in the thickness direction. The attachment portion has a bottom wall having a larger contour than the ceramic fired plate and a side wall standing from the periphery of the bottom wall. In the ceramic fired plate, the back surface is attached to the bottom wall with an elastic material interposed in a state where a gap is secured between the periphery of the ceramic fired plate and the side wall.
The present invention is also a portable audio device having a housing. The housing includes a housing body and a lid body connected to the housing body so as to be openable and closable. The casing main body has a flat plate shape, and one surface in the thickness direction is an inner surface opened and closed by the lid, and the other surface in the thickness direction is a lower surface. The lid body has a flat plate shape, and one surface in the thickness direction is an inner surface that opens and closes the inner surface of the housing body, and the other surface in the thickness direction is an upper surface. Attachment portions are provided over the entire area of the lower surface of the housing and the entire area of the upper surface of the lid. A ceramic fired plate is disposed on the mounting portion. The ceramic fired plate has a surface formed as a decorative surface that forms one surface in the thickness direction and a back surface that forms the other surface in the thickness direction. The attachment portion has a bottom wall having a larger contour than the ceramic fired plate and a side wall standing from the periphery of the bottom wall. In the ceramic fired plate, the back surface is attached to the bottom wall with an elastic material interposed in a state where a gap is secured between the periphery of the ceramic fired plate and the side wall.
The present invention is also a portable audio device having a flat plate-shaped housing. In the casing, one surface in the thickness direction is an upper surface, and the other surface in the thickness direction is a lower surface. Attachment portions are respectively provided on the entire surface and the lower surface. A ceramic fired plate is disposed on the mounting portion. The ceramic fired plate has a surface formed as a decorative surface that forms one surface in the thickness direction and a back surface that forms the other surface in the thickness direction. The attachment portion has a bottom wall having a larger contour than the ceramic fired plate and a side wall standing from the periphery of the bottom wall. In the ceramic fired plate, the back surface is attached to the bottom wall with an elastic material interposed in a state where a gap is secured between the periphery of the ceramic fired plate and the side wall.

According to the present invention, a product or an article including an electronic device or the like having a ceramic fired plate attached to the attachment portion falls from the front or back or side of the product, or hits the front or back or side of the product. When applied, the impact acts on the side wall, but a gap is secured between the ceramic fired plate and the side wall, so that the impact can be prevented from acting on the ceramic fired plate. Can be prevented from cracking. In addition, when an impact is applied by dropping from the upper surface or the lower surface or by hitting an object on the upper surface or the lower surface, the impact acts on the upper surface or the lower surface, but between the ceramic fired plate and the bottom wall. Since the elastic material is interposed, the impact can be mitigated by the elasticity of the elastic material, and cracking of the ceramic fired plate can be prevented.
Therefore, it becomes possible to use the ceramic fired board which is easy to break for products and articles including electronic devices and the like, and it is possible to enhance the profound feeling, luxury and novelty of those products and articles.

Next, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, a case where the ceramic fired plate mounting structure of the present invention is applied to a housing of an MD (minidisc) player which is a portable electronic device and a portable audio device will be described.
1 is a perspective view of the MD player, FIG. 2 is a perspective view of the MD player with the lid fully opened, FIG. 3 is a perspective view of the housing body viewed from below, FIG. 4 is a perspective view of the lid, and FIG. (A) is a perspective view of a ceramic fired plate attached to the housing body, (B) is a perspective view of the back surface of the ceramic fired plate, and FIG. 6 (A) is a perspective view of the ceramic fired plate attached to the lid. FIG. 7B is a perspective view of the back surface of the ceramic fired plate, FIG. 7A is a cross-sectional view showing the mounting state of the ceramic fired plate, FIG. 8B is an enlarged view of the B arrow portion of FIG. It is CC sectional drawing of FIG. 7 (A).

As shown in FIG. 1, the housing 12 of the MD player 10 has a flat rectangular plate shape.
The housing 12 includes a rectangular plate-shaped housing main body 14 and a rectangular plate-shaped lid body 16 connected to the housing main body 14 so as to be openable and closable.
As shown in FIG. 2, in this embodiment, the lid body 16 is swingably connected to the housing body 14 to open and close a recording medium (minidisc) loading / unloading port 18.
The housing body 14 and the lid body 16 are both made of metal such as brass, but may be made of synthetic resin.
The casing main body 14 has a flat plate shape, and one surface in the thickness direction is an inner surface closed by the lid body 16, and the other surface in the thickness direction is a lower surface 1402 formed as a decorative surface.
Inside the housing body 14, a recording medium (mini disk) inserted through the recording medium loading / unloading port 18 is reproduced and a recording / reproducing unit for recording information on the recording medium (mini disk), a personal computer, etc. A data communication unit or the like for bidirectionally transmitting information to and from an external device is provided, and a headphone or earphone jack for listening to reproduced audio information is provided on the side surface of the housing body 14. An input connector for inputting information from the outside, a data communication connector for connecting to the external device, and the like are provided.

The lid 16 has a flat plate shape with a small thickness.
The lid body 16 is an inner surface where one surface in the thickness direction closes the inner surface of the housing body 14 and the other surface in the thickness direction is an upper surface 1602 formed as a decorative surface.

Attachment portions 20 are provided on the entire area of the lower surface 1402 of the housing body 14 and the entire area of the upper surface 1602 of the lid body 16, and the ceramic fired plate 30 is disposed on the attachment portion 20.
As shown in FIGS. 3 and 4, the attachment portion 20 is formed of a bottom wall 22 and a side wall 24 that rises from the periphery of the bottom wall 22.
For convenience of explanation, a direction parallel to the pivot axis of the lid 16 is referred to as a horizontal direction, and a direction perpendicular to the horizontal direction is referred to as a vertical direction.
The bottom wall 22 is formed of a rectangular flat surface having a larger outline than the ceramic fired plate 30.
As shown in FIG. 3, the bottom wall 22 of the mounting portion 20 of the housing body 14 is provided with a notch 26 extending in the lateral direction, and the notch 26 extends in the vertical direction on both sides of the extending direction. The width is small, and the width in the longitudinal direction at the center in the extending direction is formed with a large dimension. The notch 26 is for avoiding a collision with a member such as a gear constituting the recording / reproducing unit.
As shown in FIG. 4, the bottom wall 22 of the attachment portion 20 of the lid body 16 is provided with a notch 26 extending in the horizontal direction with a uniform width in the vertical direction. The notch 26 is for avoiding a collision with the recording medium when the recording medium is loaded or unloaded.

The side walls 24 stand from four sides around the bottom wall 22.
As shown in FIGS. 7A and 8, the side wall 24 has a height lower than the surface of the ceramic fired plate 30 (this embodiment) when the ceramic fired plate 30 is attached onto the bottom wall 22. In this case, the height is 0.15 mm lower than the surface of the ceramic fired plate 30.
This is because even if an impact acts on the ceramic fired plate 30 from above the side wall 24, the size of the ceramic fired plate 30 in this direction is large and difficult to break, and the ceramic fired plate 30 is also provided on the side of the mounting portion 20. This is to enhance the exposure, profound feeling, luxury, and novelty.

In the present embodiment, the ceramic fired plate 30 may be mainly composed of zirconia and may contain yttria, alumina, titania and the like. Hereinafter, the term “zirconia” in this specification includes the case where yttria, alumina, titania and the like are appropriately added. More specifically, it is tetragonal (tetragonal) and polycrystalline.
The ceramic fired plate 30 is manufactured through a process of press molding, degreasing, and firing by mixing a binder or the like with zirconia powder.
The specific gravity of zirconia used in the present embodiment is about 6.0, the bending strength is about 100 Kgf / mm ² , and the Vickers hardness is 1700 Kg / m ² , so that it is strong in strength and hardly damaged.
As shown in FIGS. 5 and 6, the ceramic fired plate 30 has one surface in the thickness direction as the front surface 3002 and the other surface in the thickness direction as the back surface 3004.
The surface 3002 is subjected to a diamond polishing process, and is formed as a decorative surface having a deep mirror surface utilizing the original color of zirconia.
In other words, the surface 3002 has a property of being glossy, deep in color, not easily scratched, and not easily soiled, even if it is soiled, if it is wiped with a cloth, it returns to its original gloss.

The surface 3002 of the ceramic fired plate 30 is formed with a curved surface having a uniform height in the horizontal direction and having a middle portion in the vertical direction lower than both end portions in the vertical direction.
In more detail, the surface 3002 of the ceramic fired plate 30 is formed such that the height in the lateral direction is slightly lower in the center than on both sides thereof.
The back surface 3004 is formed as a molded surface.
On the back surface 3004, a bulging portion extending in the lateral direction is formed at a uniform height in the middle portion in the vertical direction, and the thickness of this portion of the ceramic fired plate 30 is large due to the bulging portion 3006. Is formed. As shown in FIG. 5, the bulging portion 3006 of the back surface 3004 of the ceramic fired plate 30 provided in the housing main body 14 is formed with a width that is greater in the intermediate portion in the lateral direction than both side portions thereof. As shown in FIG. 6, the bulging portion 3006 on the back surface of the ceramic fired plate 30 provided on the lid 16 is formed with a uniform width in the lateral direction.

The ceramic fired plate 30 (fired plate made of zirconia) is vulnerable to deflection. Therefore, the ceramic fired plate 30 having a small thickness is cracked when subjected to an impact in the thickness direction.
In the present embodiment, as in other types of portable electronic devices, the ceramic fired plate 30 is set horizontally, and a weight of 500 g in weight is dropped onto the ceramic fired plate 30 from a height of 6 cm. The minimum value of the thickness that can withstand the weight drop was measured and found to be 0.6 mm.
For this reason, the thickness of the ceramic fired plate 30 is set to 0.6 mm at the thinnest portion where the surface 3002 is depressed in the middle portion in the vertical direction, and the thickest surface 3002 protrudes toward both ends in the vertical direction. However, it was 2.3 mm for the decoration (bottom surface) of FIG. 5 and 2.1 mm for the decoration (top surface) of FIG.

Further, as shown in FIG. 7, the thickness of the ceramic fired plate 30 corresponding to this portion is increased by using the notch 26 of the bottom wall 22, and specifically, a member such as a recording medium or a gear does not hit. Thus, the bulging portion 3006 is formed with a protruding height of 0.35 mm in the decoration (bottom surface) of FIG. 5 and 0.45 mm in the decoration (top surface) of FIG. I try to position it.
That is, the bulging portion 3006 is provided to make the ceramic fired plate 30 difficult to bend and hard to crack.
In this case, as shown in FIG. 7B, the wall surface of the bulging portion 3006 rising from the back surface 3004 is not a flat surface rising from the back surface 3004 but a curved surface 3008 that gradually rises from the back surface 3004. When an impact is applied in the vertical direction, the stress concentration on the portion where the bulging portion 3006 rises is dispersed by the curved surface 3008 to prevent cracking.

The ceramic fired plate 30 has a back surface 3004 attached to the bottom wall 22 with an elastic material interposed in a state where a gap S is secured between the periphery of the ceramic fired plate 30 and the side wall 24.
In the present embodiment, the back surface 3004 of the ceramic fired plate 30 is attached to the bottom wall 22 by the double-sided adhesive tape 40 having elasticity, and the elastic material is included in the double-sided adhesive tape 40.
A commercially available product can be used as such a double-sided adhesive tape 40. For example, a shock-resistant thin double-sided adhesive tape having a trade name “DaiTac # 8810SA-120” available from Dainippon Ink and Chemicals, Inc. can be used.
Further, instead of the double-sided pressure-sensitive adhesive tape 40, the back surface 3004 of the ceramic fired plate 30 may be attached to the bottom wall 22 with an adhesive having elasticity, and a commercially available product can be used as such an adhesive. Toray Corning Silicone Co., Ltd., trade name “low-tone adhesive silicone adhesive” and Konin Co., Ltd., trade name “Bond Neda Bond G Quick” can be used.

In the present embodiment, the gap S is formed with a uniform distance from the side wall 24 over the entire circumference of the ceramic fired plate 30.
The dimension of the gap S is determined from the viewpoint of preventing the transmission of impact from the side to the ceramic fired plate 30, and the maximum value is determined from the viewpoint of appearance and design. From such a viewpoint, the dimension of the gap S is preferably in the range of 0.03 to 0.1 mm, more preferably in the range of 0.04 to 0.06 mm. In the embodiment, the dimension of the gap S is 0.05 mm. .
The management of the gap S is performed by using a jig when the ceramic fired plate 30 is attached, and after the attachment, a gauge is inserted to check whether or not the gap S has a desired value.

According to the present embodiment, the MD player 10 is dropped when being carried, and the MD player 10 falls to the ground from the front or back or side thereof, or an object hits the front or back or side of the MD player 10. When an impact is applied to the front and rear or the left and right sides, the impact acts on the side wall 24, but since the gap S is secured between the ceramic fired plate 30 and the side wall 24, the impact is applied to the ceramic. Acting on the fired plate 30 can be prevented, and cracking of the ceramic fired plate 30 can be prevented.
In addition, when the MD player 10 was dropped when being carried, the MD player 10 fell to the ground from the upper surface or the lower surface, or an object hit the upper surface or the lower surface of the MD player 10, and an impact was applied to the upper surface or the lower surface of the MD player 10. At this time, although the impact acts on the upper surface or the lower surface, since the double-sided adhesive tape 40 having elasticity is interposed between the ceramic fired plate 30 and the bottom wall 22, the impact is mitigated by the elasticity of the double-sided adhesive tape 40. And cracking of the ceramic fired plate 30 can be prevented.
Further, since there is no attachment member such as a screw head on the surface 3002 of the ceramic fired plate 30, the ceramic fired plate 30 has a solid feeling and a high-class feeling, and a novel feeling. This is extremely advantageous in generating the product.

In the present embodiment, the gap S is formed with a uniform distance from the side wall 24 over the entire circumference of the ceramic fired plate 30, and the gap S is 0.05 mm. The gap S is not conspicuous around the fired plate 30, and is therefore advantageous for enhancing the sense of solidness, luxury, and novelty by the ceramic fired plate 30.
Further, the ceramic fired plate 30 is hard to be scratched, and the surface 3002 keeps its shine, and the double-sided adhesive tape 40 is used to attach the ceramic fired plate 30. When the model is changed due to a change in the form or recording / reproduction method, if the mounting part 20 having the same size is provided in the case 12 whose model has been changed, the ceramic fired plate 30 is peeled off from the old model and the both sides are again applied to the new model. It can be reused by attaching with the adhesive tape 40, and the ceramic fired plate 30 can be used permanently without being discarded.
Further, in the present embodiment, the ceramic fired plate 30 attached to the entire area of the lower surface 1402 of the housing body 14 and the entire area of the upper surface 1602 of the lid body 16 has a surface 3002 whose longitudinal intermediate portion is longitudinal. Is formed with a curved surface lower than both end portions of the portable audio device. Therefore, it is easy to have a vertical intermediate portion of the portable audio device, which is advantageous for carrying.

Although the case where the ceramic fired plate 30 is made of zirconia has been described in the present embodiment, the ceramic fired plate 30 is not limited to zirconia, and may be other ceramic materials such as sapphire, glass, and ceramics.
Further, in the present embodiment, the case where the ceramic fired plate 30 is provided on both the lower surface 1402 of the housing body 14 and the upper surface 1602 of the lid body 16 has been described, but the ceramic fired plate may be provided on either one. The location where 30 is provided is determined from the viewpoint of further enhancing the profound feeling, luxury, and novelty according to the application and shape of the applied electronic device. For example, the housing 12 has an upper surface and a lower surface. When the front, back, and left and right side surfaces are provided, the mounting portion 20 is provided on any one of the front, top, left and right side surfaces, or among the front, top, left and right side surfaces. The attachment part 20 may be provided on any two or more surfaces, and the ceramic fired plate 30 may be disposed on the housing 12 via the attachment part 20.
Further, in the present embodiment, the size of the attachment portion 20 and the ceramic fired plate 30 is the size over the entire area of the lower surface 1402 of the housing body 14 and the entire area of the upper surface 1602 of the lid body 16, and the planar view shape is rectangular. Although the case has been described, the size and shape of the mounting portion 20 and the ceramic fired plate 30 are arbitrary, and from the viewpoint of further enhancing the profound feeling, luxury feeling, and novelty depending on the application and shape of the applied electronic device. It is changed as appropriate.

Further, in the present embodiment, the case has been described in which the housing 12 of the portable electronic device includes the housing body 14 and the lid body 16 that is connected to the housing body 14 so as to be openable and closable. Of course, the present invention can also be applied to the casing 12 of a portable electronic device that does not include the lid 16.
In this embodiment, the case where the portable electronic device is a portable audio device has been described. However, the portable electronic device is not limited to the portable audio device. For example, the portable electronic device is a mobile phone, a digital camera, or a digital video camera. It can be widely applied to other electronic devices such as in-vehicle electronic devices (such as car audio systems and navigation systems), notebook computers, and portable game machines.
Further, in the present embodiment, the case where the present invention is applied to the casing 12 of the electronic device has been described. However, the scope of the present invention is not limited to the casing 12 of the electronic device. When the ceramic fired plate 30 is formed on a plate 30 and attached to a bag such as an attache case or a woman's bag, or the surface of a gear box provided in a driver's seat of an automobile and having a groove for moving a gear change lever is formed. The present invention is widely applied to various products, articles, members, and parts thereof, such as the ceramic fired plate 30.

It is a perspective view of MD player. It is a perspective view of MD player in the state where a lid was fully opened. It is the perspective view which looked at the housing body from the lower part. It is a perspective view of a lid. (A) is a perspective view of the ceramic fired board attached to a housing body, (B) is a perspective view of the back surface of a ceramic fired board. (A) is a perspective view of the ceramic fired board attached to a cover body, (B) is a perspective view of the back surface of a ceramic fired board. (A) is sectional drawing which shows the attachment state of a ceramic baking board, (B) is an enlarged view of the B arrow part of (A). It is CC sectional drawing of FIG. 7 (A).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... MD player, 12 ... Case, 14 ... Case body, 16 ... Cover body, 20 ... Mounting part, 22 ... Bottom wall, 24 ... Side wall, 30 ... Ceramic fired plate, 40 ...... Double-sided adhesive tape.

Claims (20)

A structure in which a ceramic fired plate is attached to a mounting portion,
The ceramic fired plate has one surface in the thickness direction and has a surface formed as a decorative surface, and a back surface that forms the other surface in the thickness direction,
The attachment portion has a bottom wall having a larger contour than the ceramic fired plate, and a side wall standing from the periphery of the bottom wall,
The ceramic fired plate is attached to the bottom wall with an elastic material interposed between the back surface and a gap between the ceramic fired plate and the side wall.
A ceramic fired plate mounting structure characterized by that.   2. The attachment of a ceramic fired plate according to claim 1, wherein the back surface of the ceramic fired plate is attached to the bottom wall by a double-sided adhesive tape having elasticity, and the elastic material is included in the double-sided adhesive tape. Construction.   2. The ceramic fired plate mounting structure according to claim 1, wherein a back surface of the ceramic fired plate is attached to the bottom wall by an adhesive having elasticity, and the elastic material is included in the adhesive.   2. The ceramic fired plate mounting structure according to claim 1, wherein the gap is formed with a uniform distance from the side wall over the entire circumference of the ceramic fired plate.   2. The ceramic fired plate mounting structure according to claim 1, wherein the ceramic fired plate is a fired plate mainly composed of zirconia. A portable electronic device having a housing,
A mounting portion is provided on the surface of the housing,
A ceramic fired plate is disposed in the mounting portion,
The ceramic fired plate has one surface in the thickness direction and has a surface formed as a decorative surface, and a back surface that forms the other surface in the thickness direction,
The attachment portion has a bottom wall having a larger contour than the ceramic fired plate, and a side wall standing from the periphery of the bottom wall,
The ceramic fired plate is attached to the bottom wall with an elastic material interposed between the back surface and a gap between the ceramic fired plate and the side wall.
A portable electronic device characterized by that.   7. The portable electronic device according to claim 6, wherein a back surface of the ceramic fired plate is attached to the bottom wall by an elastic double-sided adhesive tape, and the elastic material is included in the double-sided adhesive tape.   7. The portable electronic device according to claim 6, wherein a back surface of the ceramic fired plate is attached to the bottom wall by an adhesive having elasticity, and the elastic material is included in the adhesive.   The portable electronic device according to claim 6, wherein the gap is formed with a uniform distance from the side wall over the entire circumference of the ceramic fired plate.   The housing includes a front surface and a back surface, an upper surface and a lower surface, and left and right side surfaces, and a surface on which the mounting portion is provided is any one or more of the front surface, the upper surface, or the left and right side surfaces. The portable electronic device according to claim 6.   The portable electronic device according to claim 6, wherein the ceramic fired plate is a fired plate mainly composed of zirconia. A portable audio device having a housing,
The casing includes a casing main body and a lid connected to the casing main body so as to be openable and closable.
The housing body has a flat plate shape, one surface in the thickness direction is an inner surface opened and closed by the lid, and the other surface in the thickness direction is a lower surface,
The lid body has a flat plate shape, one surface in the thickness direction is an inner surface that opens and closes the inner surface of the housing body, and the other surface in the thickness direction is an upper surface,
A mounting portion is provided over the entire upper surface of the lid,
A ceramic fired plate is disposed in the mounting portion,
The ceramic fired plate has one surface in the thickness direction and has a surface formed as a decorative surface, and a back surface that forms the other surface in the thickness direction,
The attachment portion has a bottom wall having a larger contour than the ceramic fired plate, and a side wall standing from the periphery of the bottom wall,
The ceramic fired plate is attached to the bottom wall with an elastic material interposed between the back surface and a gap between the ceramic fired plate and the side wall.
A portable audio device characterized by that. A portable audio device having a housing,
The casing includes a casing main body and a lid connected to the casing main body so as to be openable and closable.
The housing body has a flat plate shape, one surface in the thickness direction is an inner surface opened and closed by the lid, and the other surface in the thickness direction is a lower surface,
The lid body has a flat plate shape, one surface in the thickness direction is an inner surface that opens and closes the inner surface of the housing body, and the other surface in the thickness direction is an upper surface,
A mounting portion is provided in each of the entire lower surface of the housing and the entire upper surface of the lid,
A ceramic fired plate is disposed in the mounting portion,
The ceramic fired plate has one surface in the thickness direction and has a surface formed as a decorative surface, and a back surface that forms the other surface in the thickness direction,
The attachment portion has a bottom wall having a larger contour than the ceramic fired plate, and a side wall standing from the periphery of the bottom wall,
The ceramic fired plate is attached to the bottom wall with an elastic material interposed between the back surface and a gap between the ceramic fired plate and the side wall.
A portable audio device characterized by that. A portable audio device having a flat plate-shaped housing,
The housing has one surface in the thickness direction as an upper surface, and the other surface in the thickness direction is a lower surface,
A mounting portion is provided on each of the entire surface and the lower surface,
A ceramic fired plate is disposed in the mounting portion,
The ceramic fired plate has one surface in the thickness direction and has a surface formed as a decorative surface, and a back surface that forms the other surface in the thickness direction,
The attachment portion has a bottom wall having a larger contour than the ceramic fired plate, and a side wall standing from the periphery of the bottom wall,
The ceramic fired plate is attached to the bottom wall with an elastic material interposed between the back surface and a gap between the ceramic fired plate and the side wall.
A portable audio device characterized by that.   The back surface of the ceramic fired plate is attached to the bottom wall by a double-sided adhesive tape having elasticity, and the elastic material is included in the double-sided adhesive tape. 2. A portable audio device according to item 1.   The back surface of the ceramic fired plate is attached to the bottom wall by an adhesive having elasticity, and the elastic material is included in the adhesive. The portable audio device described.   The portable audio according to any one of claims 12, 13, and 14, wherein the gap is formed with a uniform distance from the side wall over the entire circumference of the ceramic fired plate. machine.   The lid body has a longitudinal direction and a transverse direction orthogonal to the thickness direction, and the surface of the ceramic fired plate has a uniform height in the transverse direction and an intermediate portion in the longitudinal direction is the longitudinal direction. The portable audio device according to claim 12 or 13, wherein the portable audio device is formed with a curved surface lower than both end portions.   The casing body and the lid body have a vertical direction and a horizontal direction orthogonal to the thickness direction, and the surface of the ceramic fired plate has a uniform height in the horizontal direction and a middle in the vertical direction. 14. The portable audio device according to claim 13, wherein the portion is formed with a curved surface lower than both ends in the vertical direction.   The portable audio device according to any one of claims 12, 13, and 14, wherein the ceramic fired plate is a fired plate mainly composed of zirconia.

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