Shell and electric appliance

Abstract

A case is made of glass and is provided with a first surface. The first surface has a concavo-convex structure formed by concavo-convex processing in at least a partial region, and in the region of the first surface having the concavo-convex structure, the ratio of the surface area when the first surface has the concavo-convex structure to the surface area when the first surface is regarded as a surface without the concavo-convex processing is 1.01 or more.

Description

TECHNICAL FIELD

[0001] The present technology relates to a housing and an electric appliance. BACKGROUND

[0002] Glass is used in electric appliances such as smartphones (for example, refer to Patent Document 1). For example, as a housing of a smartphone or the like, a resin or a metal or the like is often selected, but in recent years, glass is often used as a material of a housing.

[0003] PRIOR ART DOCUMENT

[0004] PATENT DOCUMENT

[0005] Patent Document 1: Japanese Patent Application Publication No. 2002-308637 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] For example, recent smartphones become easy to heat with an increase in performance. As a material of a housing of a smartphone, from the viewpoint of radio wave permeability, a metal having high thermal conductivity is not suitable, and a resin which is easy to scratch and has low rigidity is not suitable, and thus glass is often used. However, glass is not enough in performance although it is slightly better than a resin in thermal conductivity, and an effective heat dissipation is expected to be achieved for a glass housing.

[0008] In view of the above circumstances, an object of the present technology is to provide a housing composed of glass suitable for an electric appliance and an electric appliance equipped with the housing.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] To achieve the above object, the housing of the present technology is composed of glass and has a first surface. The first surface is a first surface having a concave-convex structure formed by concave-convex processing in at least a part of the region, and a ratio of a surface area when the first surface has the concave-convex structure to a surface area when the first surface is regarded as a surface which is not subjected to the concave-convex processing is 1.01 or more in a region of the first surface having the concave-convex structure.

[0011] According to such a structure, a housing which can effectively dissipate heat can be obtained.

[0012] The first surface forms a surface of an electric appliance in which the housing is assembled, and a height of the convex portion can be 0.005 mm or more.

[0013] The height of the convex portion can be 20% or less of a thickness of the housing in a region corresponding to the convex portion.

[0014] A distance between adjacent convex portions can be 0.2 mm or more.

[0015] The surface of the above-mentioned first surface of the region having the above-mentioned concavo-convex structure can be roughened.

[0016] The heat flow peak value Qmax of the region having the above-mentioned concavo-convex structure can be 0.50 or less.

[0017] The above-mentioned housing can be attached to an electric appliance.

[0018] The electric appliance of the present technology is provided with a housing. The above-mentioned housing is composed of glass, is provided with a first surface, at least a part of the first surface has a concavo-convex structure formed by concavo-convex processing, and the ratio of the surface area of the first surface when having the concavo-convex structure to the surface area of the first surface when the first surface is regarded as a surface not subjected to the concavo-convex processing is 1.01 or more in the region of the first surface having the concavo-convex structure. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 An exploded perspective view of a smartphone that is one embodiment of the present technology.

[0020] Figure 2 (A) to (C) of FIG. 1 are plan views each showing an example of the arrangement of a concavo-convex structure region on a back panel of a smartphone.

[0021] Figure 3 (A) of FIG. 2 is a partially enlarged plan view showing a concavo-convex structure formed on the surface of a back panel of a smartphone, Figure 3 (B) of FIG. 2 is a partially enlarged cross-sectional view of a portion of Figure 3 (A) of FIG. 2 taken along the line IIIB-IIIB, Figure 3 (C) of FIG. 2 is a view showing the concavo-convex state of the surface of Figure 3 (B) of FIG. 2 taken along the line IIIC-IIIC, Figure 3 (D) of FIG. 2 is an enlarged plan view of a convex portion formed on the surface of the back panel.

[0022] Figure 4 is a schematic view showing a state in which a user's finger touches the back panel.

[0023] Figure 5 is a schematic partially cross-sectional view showing a manufacturing process of the back panel.

[0024] Figure 6 (A) to (D) of FIG. 3 are partially enlarged cross-sectional views each showing another example of the cross-sectional shape of the back panel.

[0025] Figure 7 (A) of FIG. 4 is a partially enlarged plan view of the vicinity of the boundary between a convex portion and a concave portion formed on the surface of a back panel, Figure 7 (B) of FIG. 4 is a view showing the concavo-convex state of the surface of Figure 7 (A) of FIG. 4 taken along the line VIIB-VIIB,

[0026] Figure 8 (A) to (H) are partial enlarged plan views each showing another example of the concavo-convex structure formed on the surface of the back surface panel.

[0027] Figure 9 (A) to (H) are partial enlarged plan views each showing another example of the concavo-convex structure formed on the surface of the back surface panel.

[0028] Figure 10 is a schematic partial cross-sectional view showing a manufacturing process of a side housing of a smartphone.

[0029] Figure 11 is a flowchart showing a manufacturing method of a side housing.

[0030] Figure 12 (A) of is a graph for explaining an evaluation method of heat dissipation performance of a back surface panel, Figure 12 (B) of is a graph showing evaluation results of heat dissipation performance of a back surface panel of one embodiment of the present technology and a back surface panel of a comparative example at measurement point A.

[0031] Reference Signs

[0032] 1: smartphone (electrical appliance); 2: back surface panel (housing); 2a: first surface, surface of the smartphone; 2b: second surface; 3: side housing; 20: convex portion; 21: concave portion DETAILED DESCRIPTION

[0033] Embodiments of the present technology will be described below with reference to the drawings.

[0034] [Structure of Electrical Appliance]

[0035] The housing of the present technology is excellent in heat dissipation performance, and is suitable for use as an exterior (housing) of an electrical appliance that generates heat during operation. As such an electrical appliance, for example, there are electronic devices, household electrical appliances, in-vehicle products, and the like. As electronic devices, for example, there are portable terminals such as smartphones and mobile phones, tablet computers, wearable devices, personal computers, cameras, audio players, game machines, mobile devices, monitors, and the like. As household electrical appliances, there are refrigerators, oven ranges, ovens, microwave ovens, toaster ovens, water heaters, television sets, humidifiers, dehumidifiers, and the like. As in-vehicle products, there are car stereos, car navigation systems, instrument panels, center consoles, and the like. Further, the instrument panel and the center console are configured with a touch panel provided on a display such as a liquid crystal display, and the touch panel also functions as a housing that accommodates the display. In the present embodiment, as an electrical appliance, a smartphone is exemplified and described.

[0036] Figure 1 is an exploded perspective view of the smartphone 1, showing a state in which the back surface panel 2 serving as a housing provided on the back surface side of the smartphone 1 is removed. As shown inFigure 1 As shown, smartphone 1 includes a circuit board 4, a display, a camera, a battery, a speaker, a microphone, and various sensors, as well as a back panel 2 and side shells 3 that house them. The side shells 3 have a generally rectangular frame shape, forming the external skeleton of smartphone 1. The first surface 3a of the side shells 3 forms the side of smartphone 1. The back panel 2 is located on the side opposite to the front of smartphone 1 where the display is located. The first surface 2a of the back panel 2 forms the surface of the back side of smartphone 1. The circuit board 4 includes a controller IC (integrated circuit) and a main CPU (central processing unit). Furthermore, Figure 1 The diagram of the raised and recessed structure provided on the first surface 2a of the rear panel 2 is omitted.

[0037] In the accompanying drawings, the horizontal axis of the rectangular back panel 2 is defined as the X-axis, and the vertical axis as the Y-axis. The Z-axis is orthogonal to both the X and Y axes and parallel to the thickness direction of the back panel 2. In this specification, the view of the back panel 2 from the Z-axis direction (thickness direction) is referred to as a top view.

[0038] [Rear Panel]

[0039] (Structure of the rear panel)

[0040] The back panel 2 is made of a glass substrate, which is a plate-shaped glass component with one side textured. There are no particular limitations on this glass component; for example, aluminosilicate glass, soda-lime glass, alkali-free glass, borosilicate glass, etc., can be used. Figure 1 and Figure 3 As shown in (B), the back panel 2 has a first surface 2a and a second surface 2b located on the side opposite to the first surface 2a. Hereinafter, the back panel 2 is sometimes referred to as a glass substrate. In this embodiment, the first surface 2a forms the surface of a smartphone (electronic device). Figure 4 As shown, the first surface 2a is the part that the user U's fingers can easily touch when using the smartphone 1. The second surface 2b is the surface located on the inside when assembled into the smartphone 1.

[0041] By using glass with radio wave transmittance as the back panel 2, radio waves transmitted and received by the communication antenna built into the smartphone 1 can pass through the back panel, thus increasing the freedom of antenna placement. Furthermore, using glass as the back panel enables electromagnetic induction-based touchless charging. Additionally, using glass as the back panel gives it a premium feel.

[0042] Typically, the glass used for the back panel of a smartphone is glossy glass with an unfinished surface. This glossy glass substrate is prone to fingerprints. In contrast, when frosted glass is used to create a matte look and prevent fingerprints, the smooth surface of frosted glass can make it slippery, posing a risk of the smartphone being dropped.

[0043] Furthermore, glass has low thermal conductivity, making heat dissipation difficult. For high-performance electrical appliances that generate a large amount of heat, this presents a technical challenge of insufficient heat dissipation, such as the formation of localized high-temperature areas. In this embodiment, effective heat dissipation is achieved by providing a region (a textured area) with a surface area that is at least a predetermined proportion relative to the surface area of ​​a surface that is not textured. This will be explained in detail below.

[0044] Figure 2 (A) is a top view of the rear panel 2 of this embodiment, showing the area (undulating structure area) where the uneven structure 26 is arranged on the first surface 2a of the rear panel 2. When describing the case where the rear panel 2 has the uneven structure 26, Figure 2 (A), as described later Figure 2 In (B) and (C), the diagrams are presented at a scale where the size of the protrusion 20 is larger than its actual size when viewed from above. Figure 2 (A)~(C) and Figure 3 In (A), the convex part 20 is represented by filling with fine dots.

[0045] like Figure 2 As shown in (A), the rear panel 2 has an opening 23 in the area where the camera is disposed. On the first surface 2a of the rear panel 2, a raised-recessed structure 26, consisting of a plurality of protrusions 20 and recesses 21, is provided over its entire extent. This raised-recessed structure 26 is uniformly provided in a predetermined pattern throughout the entire extent of the first surface 2a. In the rear panel 2, the first surface 2a is a raised-recessed surface with a raised-recessed structure, and the second surface 2b is a flat surface. In this embodiment, although an example of providing the raised-recessed structure 26 over the entire extent of the rear panel 2 has been given, other embodiments are also possible. Figure 2 As shown in (B) and (C), a raised and recessed structure area is provided locally on the first surface 2a of the back panel 2, which will be explained later.

[0046] Figure 3 (A) is a partially enlarged top view showing the undulation structure 26 formed on the surface of the rear panel 2. Figure 3 (B) is Figure 3 A sectional view at line IIIB-IIIB of (A). Figure 3 (C) is Figure 3Enlarged view of the portion of (B) enclosed by the rectangle IIIC with a single-dotted line. Figure 3 (D) is an enlarged top view of the protrusion 20 formed on the surface of the rear panel 2. Furthermore, Figure 3 The embossed pattern shape shown in (A) is an example, and is not limited to that embossed pattern shape.

[0047] like Figure 3 As shown in (A) and (B), the first surface 2a has multiple independent island-shaped protrusions 20 and recesses 21. The protrusions 20 protrude from the second surface 2b toward the first surface 2a. Due to the presence of multiple protrusions 20, recesses 21 are formed. The region where the protrusions 20 are located is a relatively thick region of the glass substrate, referred to as the first region 40. The region where the recesses 21 formed by the protrusions 20 are located is a relatively thin region of the glass substrate, referred to as the second region 41.

[0048] On the second side 2b of the back panel 2, a film with a colored film formed by printing or vapor deposition can be adhered via transparent double-sided adhesive (corresponding to...). Figure 5 (As indicated by reference numeral 6 in the attached drawing (F), this coloring film forms the color of the back panel 2. Alternatively, the coloring film can also be formed on the second surface 2b by a coating method such as direct printing or coating. Or, a metallic film can be formed on the second surface 2b as a coloring film by vapor deposition to impart a metallic luster to the back panel 2.

[0049] (The textured surface of the back panel)

[0050] exist Figure 3 In the example shown in (A), a plurality of protrusions 20 are distributed in an alternating grid pattern, arranged at approximately constant intervals (spacing) in the X-axis and Y-axis directions. More specifically, a column of protrusions 25 arranged at intervals in the Y-axis direction and other adjacent columns of protrusions 25 arranged separately in the X-axis direction are each staggered by half a spacing in the Y-axis direction.

[0051] like Figure 3 As shown in (A) and (D), the protrusions 20 have a rhombus shape when viewed from above. The embossed pattern shape of this embodiment is a pattern formed by the rhombus-shaped protrusions 20 arranged in an interlaced grid pattern when viewed from above. Furthermore, the shape of the protrusions 20 is not limited to rhombus, but can take various shapes. Other specific examples will be described later.

[0052] like Figure 3As shown in (C), the surface of the concave-convex surface of the first surface 2a is roughened by sanding processing and has fine concave-convexes. The fine concave-convexes are extremely fine in size compared with the concave-convexes in the concave-convex structure 26. By roughening the surface of the concave-convex surface of the first surface 2a, the first surface 2a is given a matte finish, and fingerprints are difficult to adhere. In addition, the first surface 2a can be given a glossy finish without sanding processing. In the present specification, the "concave-convex structure" is not the fine concave-convexes formed by sanding processing but refers to the concave-convex structure 26 having a predetermined pattern shape with a height of 0.005 mm or more of the convex portion 20. In addition, the processing for forming the concave-convex structure 26 is referred to as concave-convex processing, and the processing for forming the fine concave-convexes of the surface of the concave-convex surface is referred to as sanding processing for distinction.

[0053] (Surface area of back surface panel)

[0054] In the concave-convex structure region (the entire range in the present embodiment) of the back surface panel 2, the ratio A of the surface area of the first surface 2a when the first surface is given a concave-convex structure to the surface area when the first surface is regarded as a surface not given concave-convex processing is 1.01 or more.

[0055] By making the ratio A 1.01 or more, the back surface panel 2 can efficiently dissipate heat due to the concave-convex structure. That is, by increasing the surface area of the first surface 2a of the back surface panel 2 compared with the surface area when the first surface 2a is regarded as a surface not given concave-convex processing, heat emitted from the smartphone 1 is easily efficiently released. Accordingly, for example, in the smartphone 1, in a case where heat is generated due to a heavy load on the CPU or heat is generated while the smartphone 1 is operated with a load applied to the battery during charging, the surface area of the back surface panel 2 is increased and has a concave-convex structure, so heat is efficiently released, and a user holding the smartphone 1 is less likely to feel overheating, and the user's anxiety about the smartphone 1 becoming hot can be alleviated.

[0056] In addition, by dissipating heat using the concave-convex structure of the back surface panel 2, the processing speed of the CPU is less likely to decrease. In general, a mechanism of suppressing heat generation by itself decreasing the operation speed is adopted in the CPU, but by dissipating heat using the concave-convex structure of the back surface panel 2 as in the present embodiment to suppress temperature rise, the processing speed of the CPU is less likely to decrease, and the operation of the smartphone 1 can be made more stable.

[0057] In addition, since the surface (the first surface 2a) of the back surface panel 2 of the present embodiment has a concave-convex structure region, the user's hand holding the smartphone 1 is less likely to come into contact with the first surface 2a, and the user is less likely to feel the heat of the back surface panel 2.

[0058] Further, the concavo-convex structure 26 can be formed by concavo-convex processing using etching processing, the details of which will be described later. The "unprocessed surface" of the above-mentioned first surface 2a means a surface in a state where the concavo-convex structure 26 has not been processed. For example, with respect to a surface that has been processed by both the concavo-convex processing and the frosting processing, the unprocessed surface is a surface that has been processed only by the frosting processing. In addition, with respect to a surface that has been processed by the concavo-convex processing but not by the frosting processing, the unprocessed surface is a surface that has not been processed by either the concavo-convex processing or the frosting processing, and is a flat surface having a gloss. The surface area when the first surface 2a of the back surface panel 2 is regarded as the unprocessed surface can be calculated, for example, in the following manner.

[0059] The calculation of the surface area when the first surface 2a is regarded as the unprocessed surface and the calculation of the ratio A will be described taking, as an example, a region of the back surface panel 2 having a concavo-convex structure, which is a region of 10 mm square. Here, it is assumed that the concavo-convex surface (first surface 2a) is not processed by the frosting processing, and the side surface of the convex portion 20 is perpendicular to the second surface 2b. It is assumed that 400 convex portions 20, which are viewed as rhombuses, are arranged in a region of 10 mm square of the glass substrate constituting the back surface panel 2, the height f of the convex portion 20 is 0.015 mm, and the length of the diagonal of the convex portion 20, which is viewed as a rhombus, is 0.32 mm and 0.24 mm. In this case, the increased surface area of each convex portion is 0.012 mm 2 . Therefore, in the region of 10 mm square, the increased surface area due to the provision of the convex portion 20 is 4.8 mm 2 . The surface area when the first surface 2a is regarded as the unprocessed surface in the region of 10 mm square is 100 mm 2 , and the surface area when the first surface 2a is the concavo-convex structure is 104.8 mm 2 , and the ratio A is 1.048.

[0060] Further, although the side surface of the convex portion 20 is schematically illustrated as being perpendicular to the second surface 2b in Figure 3~Figure 5 , in the present embodiment, strictly speaking, as shown in (A) of Figure 6 , (A) and (B) of Figure 7 , the side surface of the convex portion 20 is a surface inclined with respect to the second surface 2b, and is formed in a manner in which the cross-sectional shape of the convex portion 20 becomes larger as it goes from the top to the bottom of the convex portion. Further, whether the side surface of the convex portion 20 is a surface inclined with respect to the second surface 2b or a surface perpendicular to the second surface 2b can be adjusted, for example, by changing the etching conditions (the kind of etching solution, the etching time, and the like) at the time of etching processing.

[0061] The surface area when the first surface is in the concave-convex structure was measured using a laser microscope "VK-X150" manufactured by Keyence Corporation. The shape measurement was performed by an observation application of the laser microscope. Thereafter, data such as the surface area, the surface roughness, the concave-convex height difference, and the like were measured by an analysis application.

[0062] From the viewpoint of achieving effective heat dissipation, in the concave-convex structure region (in the present embodiment, the entire range) of the first surface 2a having the concave-convex structure 26, the ratio A of the surface area when the first surface is in the concave-convex structure to the surface area when the first surface is regarded as a surface which is not subjected to the concave-convex processing is 1.01 or more, and more preferably 1.04 or more.

[0063] The heat dissipation effect tends to increase in proportion to the surface area. The higher the height f of the convex portion 20, in other words, the deeper the depth of the concave portion 21, the larger the surface area of the first surface 2a. Here, with reference to (C) of FIG. 6, the height f of the convex portion 20 refers to the distance from the deepest bottom of the concave portion 21 to the uppermost portion of the convex portion 20. With reference to (C) of FIG. 6, from the viewpoint of ensuring the strength of the back surface panel 2, the height f of the convex portion 20 is preferably 20% or less of the thickness e of the back surface panel 2 from the second surface 2b to the uppermost portion of the convex portion 20. Further, the thickness e of the back surface panel 2 from the second surface 2b to the uppermost portion of the convex portion 20 is identical to the thickness of the glass substrate before the concave-convex processing, and hereinafter is sometimes referred to as the thickness e of the back surface panel 2. Figure 3 Figure 3 The upper limit value of the above-mentioned ratio A is not particularly limited, and can be appropriately set depending on the thickness of the glass substrate before the concave-convex processing. In the back surface panel 2 of the smartphone 1 in the present embodiment, from the viewpoint of the lightweight of the smartphone 1 and ensuring the strength of the back surface panel 2, and further the smartphone 1, the thickness e of the back surface panel 2 is about 0.3 mm or more and 1.0 mm or less. In this range, from the viewpoint of ensuring the strength of the back surface panel 2, the ratio A is preferably, for example, 1.2 or less. Further, in the case where the housing (in the present embodiment, the back surface panel) of the electric appliance is formed using a glass substrate having a relatively large thickness, the ratio A can be set to be as high as, for example, 1.50 to 2.00 while ensuring the strength of the housing.

[0064] With respect to the back surface panel 2 of the smartphone 1, from the viewpoint of achieving effective heat dissipation while ensuring the strength of the back surface panel 2, the ratio A is 1.01 or more and 1.20 or less, and more preferably 1.04 or more and 1.15 or less. Further, from the viewpoint of making the user who holds the smartphone 1 less likely to feel heat, the height f of the convex portion 20 (corresponding to the depth of the concave portion 21) is preferably 0.005 mm or more, and more preferably 0.015 mm or more.

[0065] With respect to the back surface panel 2 of the smartphone 1, from the viewpoint of achieving effective heat dissipation while ensuring the strength of the back surface panel 2, the ratio A is 1.01 or more and 1.20 or less, and more preferably 1.04 or more and 1.15 or less. Further, from the viewpoint of making the user who holds the smartphone 1 less likely to feel heat, the height f of the convex portion 20 (corresponding to the depth of the concave portion 21) is preferably 0.005 mm or more, and more preferably 0.015 mm or more.

[0066] (Dimensions related to the concave-convex structure of the back surface panel)​

[0067] The following uses Figure 3 The dimensions related to the concavo-convex configuration in the present embodiment are described. The numerical values listed here are examples, and are not limited to these values.

[0068] Referring to Figure 3 (A) of FIG. 1, the distance (pitch) a between the centers of the adjacent convex portions 20 in the Y-axis direction is 0.5 mm or more and 2.0 mm or less, and in the present embodiment, is 0.5 mm. The distance (pitch) b between the centers of the adjacent convex portions 20 in the X-axis direction is 0.5 mm or more and 2.0 mm or less, and in the present embodiment, is 0.5 mm.

[0069] Referring to Figure 3 (A) of FIG. 1, from the viewpoint of improving the grip property by the concavo-convex rubbing of the skin of the user of the smartphone 1, the distance c (distance d) between the adjacent convex portions 20 in the X-axis direction (Y-axis direction) is preferably 0.2 mm or more and 2.0 mm or less. For example, if the distance between the adjacent convex portions 20 is too narrow, the fingers are difficult to enter and the concavo-convex feeling is not easily felt. By making the distance between the adjacent convex portions 20 in the above range, the concavo-convex feeling is easily felt by the sense of touch, and by this sense of touch, the user can be provided with a sense of security in use that the smartphone 1 is not easily dropped from the hand. In the present embodiment, the distance c between the adjacent convex portions 20 in the X-axis direction is 0.18 mm, and the distance d between the adjacent convex portions 20 in the Y-axis direction is 0.26 mm.

[0070] Referring to Figure 3 (B) and (C) of FIG. 1, from the viewpoint of improving the portability with the lightening when the smartphone 1 while ensuring the strength of the back panel 2, the thickness e of the back panel 2 is preferably 0.3 mm or more and 1.0 mm or less, and more preferably 0.5 mm or more to 0.7 mm. In the present embodiment, the thickness e of the back panel 2 is 0.55 mm. The thickness e of the back panel 2 is the thickness of the first region 40 of the back panel 2. In the present embodiment, the thickness of the second region 41 of the back panel 2 is 0.535 mm.

[0071] Referring to Figure 3Regarding (B) and (C), the height f of the protrusion 20 (corresponding to the depth of the recess 21) is preferably 0.005 mm or more, more preferably 0.015 mm or more, from the perspective of making it less likely to feel heat, making it easier to feel the unevenness through touch, providing the user with a sense of security during use that prevents it from slipping out of their hand, and actually preventing slippage. Furthermore, from the perspective of ensuring the strength of the back panel 2, the height f of the protrusion 20 is preferably 20% or less of the thickness e of the back panel 2. Specifically, in the back panel 2 of the smartphone 1, from the viewpoint of ensuring the strength of the back panel and from the perspective of good productivity during the uneven processing of the glass substrate, the height f of the protrusion 20 is preferably 0.05 mm or less, more preferably 0.02 mm or less. In this embodiment, the height f of the protrusion 20 is 0.015 mm.

[0072] Considering grip, tactile feel, and dimensions when the protrusions 20 are distributed, the top-view dimensions of the protrusions 20 are preferably both 0.1 mm or more along the X-axis and Y-axis. (Refer to...) Figure 3 For (B) and (D), the length g along the X-axis corresponding to the longer of the two diagonals of the rhomboid protrusion 20 when viewed from above is preferably 0.1 mm or more and 1 mm or less, more preferably 0.2 mm or more and 0.6 mm or less. In this embodiment, the length g is 0.32 mm. The length h along the Y-axis corresponding to the shorter diagonal is preferably 0.1 mm or more and 1 mm or less, more preferably 0.2 mm or more and 0.6 mm or less. In this embodiment, the length h is 0.24 mm.

[0073] In this embodiment, the surface roughness Ra of the first surface 2a, which has fine irregularities due to the sanding process, is 0.7 μm.

[0074] (Evaluation of heat dissipation on the rear panel)

[0075] As an example, a Figure 3 The glass substrate shown in this embodiment has the aforementioned values ​​for the thickness and various dimensions related to the raised and recessed patterns of the glass substrate used in the back panel 2. The glass substrate of this embodiment is a substrate that has undergone raised and recessed processing and a matte finish with a surface roughness Ra of 0.7 μm. As a comparative example, a glass substrate with a surface roughness Ra of 0.7 μm and a thickness of 0.55 mm was prepared after only a matte finish to roughen the surface. The surface of this comparative example's glass substrate corresponds to the surface of the glass substrate of the embodiment when it is considered as an un-raised and recessed surface. The scale A in the glass substrate of the embodiment is 1.048.

[0076] Figure 12 (A) is a top view used to illustrate the heat dissipation evaluation method. For example...Figure 12 As shown in (A), the glass substrate of the embodiment (or the glass substrate of the comparative example, with a frosted surface) is arranged on the heat diffusion graphite sheet 50 with the first surface 2a having an uneven structure as the upper surface. The heat diffusion graphite sheet 50 is arranged such that a portion overlaps with the glass substrate of the test object, while the remaining portion does not overlap with the glass substrate of the test object and protrudes from the glass substrate. A heater (1.55W) 51 is arranged in the area of ​​the heat diffusion graphite sheet 50 that does not overlap with the glass substrate. Heat from the heater 51 diffuses throughout the entire area of ​​the heat diffusion graphite sheet 50. The glass substrate of the test object is heated using the heater 51 and the heat diffusion graphite sheet 50, and two measurement points A and B are set in the area where the heat diffusion graphite sheet 50 overlaps with the glass substrate of the test object to evaluate the temperature rise at each measurement point.

[0077] Figure 12 (B) shows the evaluation results of the temperature rise at measurement point A. The vertical axis, Δ, represents the temperature difference between measurement point A and room temperature. Figure 12 As shown in (B), the glass substrate of the embodiment exhibits a lower temperature rise compared to the glass substrate of the comparative example. The same trend in temperature rise is also observed at measurement point B. Thus, it is confirmed that the glass substrate of the embodiment has a temperature approximately 1 degree lower than the glass substrate of the comparative example, suppressing the temperature rise of the glass substrate of the embodiment, and the heat dissipation performance of the glass substrate of the embodiment is higher than that of the glass substrate of the comparative example.

[0078] Furthermore, a glass substrate was placed on a heater coated with thermally conductive lubricating oil (Example or Comparative Example), and the thermal resistance value was calculated based on the temperature difference between a temperature measuring point on the heater and a temperature measuring point on the glass substrate at the corresponding position. The thermal resistance value was 0.4 in the glass substrate of the Example and 0.45 in the glass substrate of the Comparative Example. Thus, it was confirmed that the thermal resistance of the glass substrate of the Example was lower than that of the glass substrate of the Comparative Example, and that the heat dissipation performance of the glass substrate of the Example was higher than that of the glass substrate of the Comparative Example.

[0079] (Evaluation of the temperature feel of the back panel)

[0080] The term "contact temperature sensation" refers to the feeling of "warmth" or "coldness" that the skin experiences when touching a sample such as a glass substrate. This sensation can be represented using the peak heat flux, Qmax. The peak heat flux, Qmax, is an indicator of the amount of heat movement. A smaller Qmax value means that it is less likely for the user to feel the temperature when picking up the sample.

[0081] According to this technology, by providing a textured area with a ratio A of 1.01 or higher on the rear panel 2, the peak heat flux Qmax can be reduced to 0.50 W / cm². 2The following design makes it less likely for users to feel the temperature of the back panel 2 when they touch it. This, for example, can alleviate users' anxiety about the smartphone 1 getting hot.

[0082] Examples 1 to 3 and Comparative Examples 1 to 6 were prepared as samples. Examples 1 to 3 were samples that had undergone surface finishing. Comparative Examples 1 to 6 were samples that had not undergone surface finishing.

[0083] The glass substrate of the first embodiment is having Figure 3 The glass substrate used in the back panel 2 of the embossed pattern of the above-described embodiment has the thickness and various dimensions related to the embossed pattern as described above, and is a glass substrate with a scale ratio of 1.048. The glass substrate of the second embodiment is a glass substrate with a convex portion larger in plan view than the embossed pattern of the first embodiment, having a diagonal length g of 0.4 mm and a length h of 0.3 mm, a diamond-shaped embossed pattern in plan view, and has also undergone a frosted finish; it is a glass substrate with a scale ratio of 1.06. The glass substrate of the third embodiment is a glass substrate with a convex portion smaller in plan view than the embossed pattern of the first embodiment, having a diagonal length g of 0.16 mm and a length h of 0.06 mm, a diamond-shaped embossed pattern in plan view, and has also undergone a frosted finish; it is a glass substrate with a scale ratio of 1.11. All three embodiments have undergone a frosted finish to achieve a surface roughness Ra of 0.7 μm.

[0084] The glass substrate of the first comparative example was a glass substrate with a surface roughness Ra of 0.7 μm and a thickness of 0.55 mm, which was only frosted. The surface of this glass substrate of the first comparative example was used as the "un-roughened surface" for calculating ratio A, and ratio A was calculated based on the surface area of ​​the glass surface of the first comparative example. The glass substrate of the second comparative example was a glass substrate with a surface roughness Ra of 0.2 μm and a thickness of 0.57 mm, which was only frosted, and ratio A was less than 1.01. The glass substrate of the third comparative example was a glass substrate with a flat surface that was neither frosted nor roughened, and a glossy surface with a thickness of 0.57 mm, the thickness of which was adjusted by surface grinding.

[0085] Comparative Examples 4 through 6 are sheet-like objects made of materials other than glass. Comparative Example 4 is resin. Comparative Example 5 is corrugated cardboard. Comparative Example 6 is stainless steel sheet.

[0086] Table 1 shows the heat flow peak value Qmax of each sample determined. The heat flow peak value Qmax was determined using a Thermo Labo KES-F7 (manufactured by KatoTech Corporation) in accordance with JIS L 1927 "Method for evaluating the cool touch property of fiber products". The heat flow peak value Qmax was determined three times for each sample, and the average value thereof was taken as the heat flow peak value Qmax of each sample.

[0087] [Table 1]

[0088]

[0089] As shown in Table 1, it was confirmed that the glass substrate is a material that is more easily felt hot or cold than resin but is more difficult to feel hot or cold than metal. It was further confirmed that the glass substrate constituting the back panel 2 of the present embodiment is more difficult to feel hot or cold than the glass substrate subjected to only the frosted processing and the glossy surface glass substrate.

[0090] (Evaluation of the grip property of the back panel)

[0091] The back panel 2 of the present embodiment can achieve effective heat dissipation by having the concave-convex configuration region with the ratio A of 1.01 or more. Further, the first surface 2a having the concave-convex configuration forms the surface of the smartphone 1, whereby the heat is not easily felt by the concave-convex configuration, and in addition, the finger does not easily slip on the first surface 2a and the grip property can be improved.

[0092] The "grip property" can be expressed using the static friction coefficient. The greater the value of the static friction coefficient, the more difficult to slip and the higher the grip property.

[0093] As samples, the glass substrate of the first embodiment and the glass substrates of the first to third comparative examples described in the evaluation of the contact cool and warm feeling of the back panel described above were prepared, and the static friction coefficient of each sample was calculated.

[0094] The static friction coefficient was calculated from the results of the friction measurement shown below. That is, using a static-dynamic friction tester (TL201Tt) manufactured by Trinity Lab Co., Ltd., the friction measurement was performed using a tactile probe that imitates a fingertip. The conditions at the time of the test were set to a load of 50 g, a speed of 10 mm / sec, and an operation distance of 50 mm. The static friction coefficient was calculated from the maximum friction force at the time of the activation of the tactile probe using the following equation.

[0095] μs = Fs / m x g (in the equation, μs: static friction coefficient, Fs: static friction force, m: load, g: acceleration due to gravity)

[0096] When determining the static friction coefficient of each sample, the static friction coefficients were calculated when there was nothing between the glass substrate and the tactile probe, when hand cream was in between, when oil was in between, when cloth (denim fabric) was in between, and when anti-slip powder (magnesium carbonate powder) was in between. Table 2 shows the calculated static friction coefficients of each sample.

[0097] [Table 2]

[0098]

[0099] As shown in Table 2, when there is nothing between the glass substrate and the tactile probe, the glossy glass substrate of the third comparative example has the best grip and is the least slip-resistant. However, as mentioned above, its heat dissipation is poor, fingerprints are easily visible, and the tactile feel is also unpleasant. Furthermore, as shown in Table 2, when anti-slip powder is present, the grip of the glossy glass substrate of the third comparative example decreases. This indicates that fingers with dry skin, for example, are less oily and more prone to slipping.

[0100] As shown in Table 2, it was confirmed that when there was nothing between the glass substrate and the tactile probe, when hand cream was present, when oil was present, or when cloth was present, the static friction coefficient of the glass substrate of the first embodiment was close to that of the frosted glass substrates of the first and second comparative examples, and the grip performance was similar. On the other hand, it was confirmed that when anti-slip powder was present, the static friction coefficient of the glass substrate of the first embodiment was higher than that of the frosted glass substrates of the first and second comparative examples and the glossy glass substrate of the third comparative example, and the grip performance was superior. In other words, it was confirmed that the glass substrate of the first embodiment is a surface that is easy to wipe even with fingers that have dry skin and little oil.

[0101] (Manufacturing method of the back panel)

[0102] Figure 5 This diagram illustrates the manufacturing process of the back panel 2. A known method is selected as appropriate to perform the raised / lowering process. Generally, photolithography is used with wet etching to perform the raised / lowering process, which can form a raised / lower pattern of a predetermined shape.

[0103] like Figure 5 As shown in (A), a glass substrate 27 is prepared. This glass substrate 27 is, for example, a glass substrate that is cut into individual smartphone units by dividing a large glass substrate.

[0104] Next, as follows Figure 5 As shown in (B), a mask 5 with a predetermined pattern shape is formed on one side of a glass substrate 27 using photolithography. The area of ​​the glass substrate 27 covered by the mask 5 will not be removed by wet etching as described later. In this embodiment, the mask 5 has a pattern shape that covers the area that serves as the protrusion 20.

[0105] Next, the glass substrate 27 is wet-etched through the mask 5. Hydrofluoric acid, for example, can be used as the etching solution. Accordingly, as... Figure 5 As shown in (C), the substrate surface in the area corresponding to the mask opening is removed to form a recess 21, while the remaining substrate surface covered by the mask 5 is not removed to form a protrusion 20. Then, as... Figure 5 As shown in (D), the mask 5 is removed to form a glass substrate 28 having a textured structure 26 on the first surface 2a.

[0106] Next, as Figure 5 As shown in (E), a frosting process is performed on the uneven surface (first surface 2a) to form micro-undulations on the surface of the uneven surface, forming the back panel 2. A known method may be selected to perform the frosting process as appropriate, for example, hydrofluoric acid may be used.

[0107] Next, as Figure 5 As shown in (F), a film 6, for example, with a colored film formed, is pasted onto the second surface 2b. Alternatively, the colored film can be formed directly on the second surface 2b by printing, coating, vapor deposition, etc.

[0108] (Other examples of embossed or recessed structures on the back panel)

[0109] exist Figure 3 In the rear panel 2 shown, an example is given where the side of the protrusion 20 has a shape that is substantially perpendicular to the second surface 2b. In contrast, as... Figure 6 Like the other back panel 2 shown in (A), the protrusion 20 can also be embossed so that the cross-section increases from the first surface 2a to the second surface 2b, and the side surface is inclined relative to the second surface 2b. Or as Figure 6 As shown in (B) of the other back panel 2, the protrusion 20 can also be embossed so that the cross-section decreases (gradually tapers) from the first surface 2a to the second surface 2b, and the side surface is inclined relative to the second surface 2b. Furthermore, although in Figure 6 Examples shown in (A) and (B) illustrate instances where micro-bumps are not provided on the uneven surface, but micro-bumps can also be provided by performing a sanding process.

[0110] In addition, although Figure 3 The rear panel 2 shown has a raised / recessed textured area on only one side, but it can also be like... Figure 6 As shown in (C) and (D), concave and convex machining is performed on surfaces 1 (2a) and 2 (2b). In this case, it can be done as follows: Figure 6 As shown in (C), the back panel 2 is configured such that the recess 21a formed on the first surface 2a and the recess 21b formed on the second surface 2b overlap when viewed from above. Alternatively, it can be configured as follows: Figure 6The back surface panel 2 shown in (D) is configured such that the recessed portion 21a formed in the first surface 2a and the recessed portion 21b formed in the second surface 2b do not overlap when viewed from above. In the case where the concave-convex processing is performed on both surfaces, it is more preferable that the concave-convex pattern applied to the first surface 2a and the concave-convex pattern applied to the second surface 2b be different, as shown in (D) of FIG. 6. In this case, the concave-convex pattern applied to the first surface 2a is preferably a pattern in which the height of the convex portion 20 is higher than the height of the convex portion 20 of the concave-convex pattern applied to the second surface 2b. By performing the concave-convex processing on the inside of the back surface panel 2 as well, it is possible to form a back surface panel having a sense of depth, for example, and it is possible to expand the range of design. Figure 6 The back surface panel 2 shown in (D) is configured such that the recessed portion 21a formed in the first surface 2a and the recessed portion 21b formed in the second surface 2b do not overlap when viewed from above. In the case where the concave-convex processing is performed on both surfaces, it is more preferable that the concave-convex pattern applied to the first surface 2a and the concave-convex pattern applied to the second surface 2b be different, as shown in (D) of FIG. 6. In this case, the concave-convex pattern applied to the first surface 2a is preferably a pattern in which the height of the convex portion 20 is higher than the height of the convex portion 20 of the concave-convex pattern applied to the second surface 2b. By performing the concave-convex processing on the inside of the back surface panel 2 as well, it is possible to form a back surface panel having a sense of depth, for example, and it is possible to expand the range of design.

[0111] In addition, although the smartphone (electrical appliance) 1 shown in Figure 1 and Figure 2 is cited as an example in which the back surface panel (housing) 2 is configured such that the first surface 2a having the concave-convex structure is on the surface side, it can also be configured such that the first surface 2a having the concave-convex structure is on the inside, and such that the second surface 2b having a flat surface is on the surface side. Such a structure also makes it possible to achieve effective heat dissipation.

[0112] (Other concave-convex pattern examples)

[0113] The concave-convex structure 26 can adopt various concave-convex pattern shapes with the ratio A being 1.01 or more, and it is possible to achieve effective heat dissipation as with the back surface panel 2 shown in Figure 3 . Figure 8 (D) of FIG. 6 (A) to (H) and Figure 9 (A) to (H) of FIG. 6 show other concave-convex pattern examples, respectively. The height of the convex portion, the distance between the convex portions, the pitch of the convex portions, the shape of the convex portions, the area of the convex portions when viewed from above, the arrangement position of the convex portions, and the like can be appropriately set from the perspective of making it difficult to feel heat and the perspective of gripability, and the like, on the basis of making the ratio A 1.01 or more to achieve effective heat dissipation.

[0114] Although an example in which the shape of the convex portion 20 when viewed from above is a rhombus is cited in the concave-convex pattern example shown in (A) of FIG. 6, the shape is not limited to this. For example, as shown in (A) to (H) of FIG. 6 and (A) to (H) of FIG. 7, the shape of the convex portion 20 when viewed from above can adopt various shapes such as a circular shape, an elliptical shape, a square shape, a triangular shape, a heart shape, a hexagonal shape, a cross shape, a zigzag line shape extending in one direction, a straight line shape, and the like. In addition, from the perspective of making it easy for a finger to rub against and improving gripability, the shape of the convex portion 20 when viewed from above is preferably a polygonal shape or the like having a corner portion. Figure 3 Figure 8 Although an example in which the shape of the convex portion 20 when viewed from above is a rhombus is cited in the concave-convex pattern example shown in (A) of FIG. 6, the shape is not limited to this. For example, as shown in (A) to (H) of FIG. 6 and (A) to (H) of FIG. 7, the shape of the convex portion 20 when viewed from above can adopt various shapes such as a circular shape, an elliptical shape, a square shape, a triangular shape, a heart shape, a hexagonal shape, a cross shape, a zigzag line shape extending in one direction, a straight line shape, and the like. In addition, from the perspective of making it easy for a finger to rub against and improving gripability, the shape of the convex portion 20 when viewed from above is preferably a polygonal shape or the like having a corner portion. Figure 9

[0115] Although an example in which the shape of the convex portion 20 when viewed from above is a rhombus is cited in the concave-convex pattern example shown in (A) of FIG. 6, the shape is not limited to this. For example, as shown in (A) to (H) of FIG. 6 and (A) to (H) of FIG. 7, the shape of the convex portion 20 when viewed from above can adopt various shapes such as a circular shape, an elliptical shape, a square shape, a triangular shape, a heart shape, a hexagonal shape, a cross shape, a zigzag line shape extending in one direction, a straight line shape, and the like. In addition, from the perspective of making it easy for a finger to rub against and improving gripability, the shape of the convex portion 20 when viewed from above is preferably a polygonal shape or the like having a corner portion. Figure 3 ​​In the example of the convex-concave diagram shown in (A), the convex portion 20 is configured with an alternating grid, but it can also be configured as follows: Figure 8 (A) Figure 9 (D) Figure 9 As shown in (E), the protrusion 20 is configured in a lattice pattern.

[0116] In addition, although Figure 2 The examples shown in (A) to (C) illustrate an instance where the same convex and concave pattern is formed over the entire area of ​​the convex and concave construction region, but the convex and concave patterns can also be arranged irregularly. For example, the convex and concave patterns can be formed by randomly arranging protrusions of different shapes and sizes when viewed from above.

[0117] As described above, the back panel 2 of this embodiment has a textured area with a ratio A of 1.01 or higher, thereby achieving effective heat dissipation, good grip, and high functionality. Smartphones equipped with such a back panel are less prone to overheating, making them less likely to feel hot during use, and are less likely to slip or fall, thus providing users with peace of mind during use. Furthermore, in the back panel 2 of this embodiment, the textured surface is roughened to form fine bumps, making it less prone to fingerprints and creating a matte appearance.

[0118] [Side shell]

[0119] Figure 10 A partial cross-sectional view showing the manufacturing process of the side shell 3. Figure 11 This is a flowchart of the manufacturing process for the side shell 3.

[0120] like Figure 1 and Figure 10 As shown in (D), the side casing 3 has a first surface 3a and a second surface 3b. When the side casing 3 is assembled onto the smartphone 1, the first surface 3a forms the side of the smartphone 1. This side is the part touched by the hand of the user who picks up the smartphone 1.

[0121] The side shell 3 is made of aluminum that has undergone corrosion-resistant treatment. For example... Figure 10As shown in (D), the first surface 3a is integrally formed with an anti-corrosion aluminum coating 34, which has micro-protrusions on a surface with relatively large protrusions and depressions. Accordingly, the first surface 3a has a wrinkled appearance and is a surface that is not slippery to the fingers. For example, in the case of enabling the smartphone 1 to have high camera performance like a digital camera, by making the surface of the side shell 3 (first surface 3a) non-slip, a tactile feel reminiscent of holding a digital camera can be provided when holding the smartphone 1 by touching the side shell 3 with one's fingers. Furthermore, by adopting a wrinkled appearance, an appearance reminiscent of holding a digital camera can be created. Accordingly, the product characteristics of the smartphone, such as high camera performance, can be expressed through both tactile and visual senses. In addition, in the smartphone 1 of this embodiment, the back panel 2 and the side shell 3 have non-slip surfaces, so the smartphone 1 is less likely to slip from the hand when used, providing a stable user experience. Furthermore, with the matte texture of the back panel 2 and the wrinkled side shell 3, the smartphone 1 of this embodiment forms an overall integrated appearance.

[0122] Next, according to Figure 11 The process, refer to Figure 10 The manufacturing method of the side shell 3 will be explained.

[0123] like Figure 10 As shown in (A), a housing 30 made of frame-shaped aluminum material is prepared. Next, as... Figure 10 As shown in (B), the first surface 3a is subjected to a first sandblasting treatment (ST1) using a sandblasting medium (abrasive material) with a large particle size. Accordingly, an aluminum shell 31 with a relatively large unevenness is formed on the first surface 3a. The sandblasting medium is, for example, spherical with a particle size of 60 μm.

[0124] Next, as Figure 10 As shown in (C), the first surface 3a is subjected to a second sandblasting treatment (ST2) using a sandblasting medium (abrasive material) with a small particle size. Accordingly, an aluminum shell 32 with fine irregularities is formed on the uneven surface. The sandblasting medium is, for example, a block with a major diameter of about 0.8 mm and a minor diameter of about 0.4 mm. Glass beads, for example, can be used as the sandblasting medium.

[0125] Next, an anodizing treatment (anti-corrosion aluminum treatment) is performed using a known method (ST3). This forms an anti-corrosion aluminum coating (oxide coating) with numerous micropores on the first surface 3a. Then, dye is allowed to penetrate the pores formed on the first surface 3a (ST4), and the pores are sealed using pressurized steam or hot water treatment (ST5, sealing). Based on this, as... Figure 10As shown in (D), a side shell 3 is manufactured that is colored and has an anti-corrosion aluminum coating 34 formed on the first surface 3a. The anti-corrosion aluminum coating 34 has micro-undulations on its surface with relatively large unevenness. By implementing the anti-corrosion aluminum treatment, hardness and corrosion resistance can be improved.

[0126] As described above, in the manufacturing of the side shell 3, a medium with a larger particle size is used to form a large-sized unevenness on the first surface 3a, and then a medium with a smaller particle size is used to form a fine unevenness on the surface of the uneven surface. Then, an anodizing process is performed on the first surface 3a with such unevenness to form a corrosion-resistant aluminum coating, thereby forming a wrinkled appearance on the first surface 3a.

[0127] [other]

[0128] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments. Various modifications can be made without departing from the spirit of the present invention.

[0129] For example, in the above embodiments, such as Figure 2 As shown in (A), the example given is the back panel 2, where the entire area of ​​the first surface 2a is a region with a concave-convex structure. However, it can also be shown as... Figure 2 As shown in (B) and (C) of the back panel 2, a raised / recessed textured area is provided locally on the first surface 2a. The raised / recessed textured area is an area with raised / recessed texture provided in a manner where the scale A is 1.01 or more.

[0130] When holding a smartphone 1, it is usually held with the camera at the top. In this case, the user's hand often touches the lower area of ​​the back panel 2. Figure 2 The back panel 2 shown in (B) is configured with a textured area in the lower region of the back panel 2 where the user is likely to touch. Accordingly, the user holding the smartphone 1 is less likely to feel excessive heat, which can reduce the user's anxiety about the smartphone 1 getting hot.

[0131] It can also be like Figure 2 As shown in (C), a raised / lowered structure area is provided corresponding to the position of the CPU built into the smartphone 1 on the back panel 2. The CPU may sometimes get hot under heavy load, but because the area corresponding to the CPU on the back panel 2 has a raised / lowered structure, the temperature rise is suppressed by utilizing the heat dissipation of the raised / lowered structure, so that the processing speed of the CPU is not easily reduced, and the operation of the smartphone 1 is more stable.

[0132] The concave-convex structure region can be provided locally like this, as long as at least a part of one face of the back face panel 2 has a concave-convex structure region. Furthermore, from the viewpoint of achieving more effective heat dissipation, it is preferable that more than 50% of the area of the back face panel 2 be a concave-convex structure region with a ratio A of 1.01 or more, and more preferably more than 70%. In addition, a logo or the like can be provided on the back face panel 2, and a concave-convex structure region can be provided on an area other than the logo.

[0133] In the above, the housing (back face panel) composed of a plate-shaped glass member (glass substrate) is exemplified, but the shape of the housing is not limited to a plate shape, and for example, can be a frame shape, and various shapes can be adopted depending on the electric appliance in which the housing is assembled.

[0134] In the electric appliance, in addition to the housing composed of glass having the concave-convex structure of the present technology, a heat dissipation unit such as a fan that forcibly cools air can be provided, and the heat dissipation performance of the electric appliance can be further improved.

[0135] The present technology can also adopt the following structure.

[0136] (1) A housing composed of glass, having a first face, at least a part of the first face having a concave-convex structure formed by concave-convex processing, and in the area of the first face having the concave-convex structure, the ratio of the surface area of the first face when the first face has the concave-convex structure to the surface area of the first face when the first face is considered to be a face that has not been processed by the concave-convex processing is 1.01 or more.

[0137] (2) The housing according to the above (1), wherein

[0138] the first face forms a surface of an electric appliance in which the housing is assembled,

[0139] the height of the convex portion is 0.005 mm or more.

[0140] (3) The housing according to the above (1) or (2), wherein

[0141] the height of the convex portion is 20% or less of the thickness of the housing in the area corresponding to the convex portion.

[0142] (4) The housing according to any one of the above (1) to (3), wherein

[0143] the distance between adjacent convex portions is 0.2 mm or more.

[0144] (5) The housing according to any one of the above (1) to (4), wherein

[0145] the surface of the first face in the area having the concave-convex structure is roughened.

[0146] (6) The housing according to any one of (1) to (5) above, wherein

[0147] The heat flow peak value Qmax of the region having the concave-convex structure is 0.50 or less.

[0148] (7) The housing according to any one of (1) to (6) above, wherein

[0149] The housing is attached to an electric appliance.

[0150] (8) An electric appliance comprising:

[0151] The housing is composed of glass, has a first surface, and has a concave-convex structure formed by concave-convex processing in at least a part of the first surface. In the region of the first surface having the concave-convex structure, the ratio of the surface area of the first surface when having the concave-convex structure to the surface area of the first surface when not having the concave-convex processing is 1.01 or more.

Claims

1. A housing made of glass, having a first surface, wherein at least a portion of the first surface has an uneven surface formed by an uneven process, wherein the ratio of the surface area of ​​the first surface with the uneven surface to the surface area of ​​the first surface as a surface without the uneven process is 1.01 or more in the region of the first surface having the uneven surface to the surface area of ​​the first surface as a surface without the uneven process.

2. The outer casing according to claim 1, wherein, The first surface forms the surface of the electrical appliance on which the housing is assembled. The height of the protrusion is 0.005 mm or more.

3. The housing according to claim 1, wherein, The height of the protrusion is less than 20% of the thickness of the outer shell in the area corresponding to the protrusion.

4. The housing according to claim 1, wherein, The distance between adjacent protrusions is 0.2 mm or more.

5. The housing according to claim 1, wherein, The surface of the first surface of the region having the aforementioned uneven structure is roughened.

6. The housing according to claim 1, wherein, The peak heat flux Qmax of the region with the aforementioned uneven structure is below 0.

50.

7. The housing according to claim 1, wherein, The outer casing is mounted on the electrical appliance.

8. An electrical appliance that has: The outer casing is made of glass and has a first surface. At least a portion of the first surface has an uneven surface formed by an uneven process. The ratio of the surface area of ​​the first surface with the uneven surface to the surface area of ​​the first surface without the uneven process is 1.01 or more.

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