JP2016090193A - Home electric appliance and decoration exterior plate used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a home electric appliance and a decoration exterior plate having an appearance which has a deep feeling in gloss and color, and high quality.SOLUTION: A coating film layer 52 is formed on a transparent exterior base material 51 of a home electric appliance body for configuring an appearance, and the outermost coating film layer in the coating film layer is formed by a lacquer coating material in which ultraviolet ray curable type lacquer coating material is the main component, and a lacquer coating film layer 56 is made to be the outermost layer. Thereby, the home electric appliance and the decoration external plate can be achieved having gloss and a deep feeling which cannot be expressed by general coating, film attachment and the like. Also, the home electric appliance and the decoration exterior plate can be provided in a short time and at low price.SELECTED DRAWING: Figure 5

Description

  The present invention relates to various appliances for home appliances intended for refrigeration, air conditioning, cooking, housework, beauty, health, hobbies, and the like, and decorative exterior plates used therefor.

  In general, home appliances such as a refrigerator, an air conditioner, a washing machine, a microwave oven, a rice cooker, a vacuum cleaner, an air purifier, an electric toothbrush, and an audio may use a transparent exterior material having a transparent appearance. This transparent exterior material is assembled and mounted on the surface or frame of a metal molded body or resin molded body constituting the exterior (see, for example, Patent Documents 1 and 2).

JP 2004-278891 A JP 2014-055569 A

  However, such a conventional transparent exterior material has a problem of improving the texture because it has less gloss and depth in color and pattern.

  The present invention has been made in view of these points, and an object of the present invention is to provide a home electric appliance having a glossy and deep appearance with a high texture and a decorative exterior plate used therefor.

  In order to achieve the above object, the present invention forms a coating layer on the transparent exterior material of the home appliance body constituting the exterior, and the outermost coating layer of the coating layer is a lacquer-containing coating layer. At the same time, the lacquer-containing coating layer is formed of a paint mainly composed of an ultraviolet curable lacquer-containing paint.

  Thereby, while being able to set it as the household appliances which have the glossiness and the deep feeling which cannot be expressed with general painting, a transparent exterior material, etc., the said household appliances can be provided in a short time and low price.

  ADVANTAGE OF THE INVENTION According to this invention, the household appliances with a high texture and the transparent exterior material used for this can be mass-produced cheaply.

External appearance perspective view of the refrigerator shown as an example of the apparatus in Embodiment 1 of this invention The perspective view which shows one of the doors of the refrigerator in the same Embodiment 1. The exploded perspective view of the door of the refrigerator in Embodiment 1 AA sectional view of FIG. 3 in the first embodiment The expanded sectional view of the transparent exterior material in Embodiment 1 (A) (b) (c) The front view which shows the example of a decoration of the door of the refrigerator in Embodiment 1 The expanded sectional view of the decorative exterior board in Embodiment 2 of this invention The expanded sectional view of the decorative exterior board in Embodiment 3 of this invention

  1st invention forms a coating-film layer in the transparent exterior base material of the household appliance main body which comprises external appearance, and makes the outermost coating layer in the said coating-film layer into a lacquer-containing coating-film layer, The lacquer coating layer is formed of a paint mainly composed of an ultraviolet curable lacquer-containing paint.

  As a result, it is possible to provide a device with gloss and depth that cannot be expressed by general painting or transparent exterior materials, and to provide the device in a short time and at a low price.

  According to a second aspect of the present invention, in the first aspect of the present invention, the transparent exterior base material of the decorative exterior plate that constitutes the door has an outer frame edge fixed to the exterior member. It is a thing.

  As a result, as with the first invention, it is possible to provide a device with gloss and depth that cannot be expressed by general painting or transparent exterior materials, and provide the device in a short time and at a low price. In addition to being able to stably hold the transparent exterior base material, the appearance of the lacquer-containing paint on the outer periphery of the transparent exterior base material does not deteriorate due to liquid dripping or liquid shrinkage accumulation, etc. Equipment can be provided.

  3rd invention provides a handle part in an exterior member in 2nd invention, and also gave the lacquer-containing coating-film layer also to the said handle part, and hold | maintains a handle part hygienically by the antibacterial property which lacquer has can do.

  According to a fourth invention, in the second or third invention, the transparent exterior base material has a configuration in which a lacquer-containing coating layer is applied only on the front side, and the back side of the exterior base material is held with a jig during painting. Can be applied to improve productivity.

  A fifth invention is the invention according to any one of the second to fourth inventions, wherein the door is provided with a plurality of doors in the device main body, and the pattern such as a lacquer by the coating layer formed on the transparent exterior base material constituting the door, It is formed so as to form one continuous pattern between the doors, and the design of the entire device can be greatly improved.

  6th invention forms a some coating-film layer in a transparent exterior base material, and while making the outermost layer of the said coating-film layer into a lacquer-containing coating-film layer, the said lacquer-containing coating-film layer is an ultraviolet curable lacquer-containing coating. It is a decorative exterior material characterized by being formed with a lacquer paint as a main component.

  As a result, it is possible to provide a decorative exterior plate having a gloss and depth that cannot be expressed by general coating or transparent exterior materials, and to provide the decorative exterior materials in a short time and at a low price. .

  7th invention is 6th invention. WHEREIN: The said coating-film layer is equipped with the lacquer-containing coating-film layer and the resin coating-film layer, and is either of the said lacquer-containing coating-film layer or the said resin coating-film layer. A decorative layer such as a lacquered picture is formed between them, and a high-quality decorative exterior material having a variety of patterns can be obtained.

  An eighth invention is the sixth or seventh invention, wherein the coating layer comprises a lacquer-containing coating layer and a resin coating layer, and the lacquer-containing coating layer or the resin coating layer is provided. A light shining material is added, and a decorative exterior material having a higher texture such as expression of depth can be obtained by a change in reflection of light by the light shining material.

A ninth invention is the invention according to any one of the sixth to eighth inventions, which has a colored layer on the back surface of the transparent exterior base material. Various colors and patterns can be easily obtained by printing, painting, pasting, etc. Since it can be carried out at a low cost, it is possible to obtain a high-quality decorative exterior material having various patterns.

  According to a tenth aspect, in the ninth aspect, the transparent exterior base material has a pair of designs of a pattern such as a lacquer by a coating layer on the front side and a colored layer on the back side. The difference in appearance can give a sense of perspective, and the difference in expression method can widen the range of design, and it can be used as a high-quality decorative exterior material.

  In an eleventh aspect of the invention according to any one of the sixth to tenth aspects, the second decorative layer is formed on the surface of the lacquer-coated film layer, and only the second decorative layer floats on the surface. It is possible to make a decorative exterior material with a high texture that gives a sense of perspective.

  In a twelfth aspect of the invention according to any one of the sixth to eleventh aspects, a coating layer is formed on the exposed portion including the end face of the transparent exterior base material. It is possible to provide a protection function from the surface, and it is possible to provide a decorative exterior material with improved quality as well as texture.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, a refrigerator is described as an example of the device. However, the present invention is not limited to this, and the configuration of the decorative exterior plate is not limited to the plate material as in this embodiment.

(Embodiment 1)
1 is an external perspective view showing a refrigerator as a home electric appliance according to Embodiment 1 of the present invention, FIG. 2 is an external perspective view showing one of the doors of the refrigerator according to Embodiment 1, FIG. 4 is an exploded perspective view of the refrigerator door according to the first embodiment, and FIG. 4 is a cross-sectional view taken along the line AA of FIG.

  In FIG. 1, a refrigerator body 1 includes a metal (for example, iron plate) outer box 2 that opens forward, a hard resin (for example, ABS) inner box 3, and the outer box 2 and the inner box 3. It consists of hard foamed urethane 4 filled with foam. The refrigerator main body 1 includes a refrigerator compartment 5, an ice making chamber 6 located below the refrigerator compartment 5, a switching chamber 7 arranged in parallel with the ice making compartment 6, and a freezer compartment located below the ice making compartments 6 and 7. 8 and a vegetable compartment 9 located in the lower part of the freezer compartment 8. Further, the front surface of the refrigerator compartment 5 can be freely opened and closed by, for example, a double door 10, and the ice making room 6, the switching room 7, the freezing room 8, and the vegetable room 9 have front-side doors 11, 12, 13 and 14 are open and closed freely.

  Here, each of the doors 10 to 14 is formed in a rectangular shape by filling and foaming hard urethane like the refrigerator main body 1 so as to have heat insulation properties, and the front surface thereof is made of a glass plate or the like in order to further improve the design. The decorative exterior plate 25 is formed by forming a coating layer 52 on the transparent exterior substrate 51.

  Hereinafter, the structure of the door 10 will be described as an example with reference to FIGS. The doors 11 to 14 other than the door 10 have the same configuration.

  For example, it is made of ABS resin. The inner frame 23 is molded by, for example, vacuum molding or injection molding. The edge frame 24 is bonded and fixed to the peripheral end surface of the inner frame 23, and is also formed of ABS resin. The decorative exterior plate 25 is obtained by forming a coating layer 52 on a transparent exterior substrate 51 made of a glass material laminated on the edge frame 24 so as to cover the inner frame 23.

  The urethane 29 is filled and foamed in the space between the inner side surface of the decorative exterior plate 25 and the inner frame 23 and the edge frame 24, and is bonded to the inner surface side of the decorative exterior plate 25 together with the inner frame 23 and the edge frame 24 by foaming. The decorative exterior plate 25 is bonded and held by the agent 26.

  Here, the edge frame 24 of the inner frame 23 does not have the insertion portion of the decorative exterior plate 25, and the decorative exterior plate 25 is configured such that its outer peripheral portion is exposed as it is.

  Further, a grip portion 31 that is recessed toward the foam heat insulating material 29 is formed in a part of the edge frame 24.

  In general, lacquer coating has a characteristic luster and depth on its surface, and the depth increases as time passes, but it must be dried for a long time in a high-humidity atmosphere. Careful attention is required for temperature management, and productivity is poor. This is due to the dehydrogenation reaction of urushiol by the enzyme (laccase) contained in the lacquer and auto-oxidation by oxygen in the air, and the painting process is a laborious and time-consuming work due to the slow reaction. .

  Accordingly, in the present invention, a light containing a monomer or oligomer having an acrylate ester nucleus disclosed in Japanese Patent No. 2821110 and Japanese Patent No. 3833202, for example, a lacquer-containing paint with improved low workability. Polymerization type lacquer paint, lacquer printing ink, or photopolymerization type lacquer paint comprising this monomer, converted from an epoxy derivative of cashew oil disclosed in JP-A-8-41166 to an acrylate derivative by chemical reaction. Furthermore, a photocurable lacquer-containing paint containing a cationically polymerizable compound, a photopolymerization initiator, and an auto-oxidized coating film component selected from the group consisting of lacquer and cashew oil disclosed in Japanese Patent No. 4868390 Used.

  FIG. 5 is an enlarged cross-sectional view of the decorative exterior plate 25 constituted by using a lacquer paint mainly composed of the ultraviolet curable lacquer-containing paint containing 50% or more of the lacquer liquid.

  In FIG. 5, the transparent exterior base material 51 of the decorative exterior board 25 is comprised, for example with the tempered glass board. This transparent exterior base material 51 has a plate thickness of about 3 to 4 mm, and has transparency enough to show through to the back surface.

  The resin coating layer 53 formed on the surface of the transparent exterior substrate 51 is formed of a colorless, transparent or colored urethane-based resin paint. In this embodiment, the resin coating layer 53 is lightly colored with a base color. The decorative layer 54 such as a lacquer painting is formed of gold powder, colored powder, screw, foil, or the like.

  The second resin coating layer 55 formed on the decorative layer 54 and the resin coating layer 53 serving as the base coloring layer is formed of a colorless and transparent urethane resin coating. The lacquer-containing coating layer 56 formed on the second resin coating layer 55 is formed of a lacquer coating mainly composed of an ultraviolet curable lacquer-containing coating containing 50% or more of lacquer liquid.

  The colored layer 57 formed on the back surface of the transparent exterior substrate 51 has a resin film attached to the inner surface via an adhesive, and the resin film is colored with a pattern such as a metallic pattern such as a hairline. Is formed. Further, instead of using a resin film, coloring or the like may be formed on the inner surface of the transparent exterior substrate 51 using a paint such as silk printing.

  The decorative exterior plate 25 having the above-described configuration is first applied or printed with the resin coating layer 53 on the surface of the transparent exterior base material 51 for ensuring adhesion or coloring, and then dried and cured. Next, a decorative layer 54 referred to as a maki-e is formed by spreading gold powder, colored powder, screw, foil, or the like at an appropriate position of the resin coating layer 53. In this state, a second resin coating layer 55 serving as an intermediate coating is formed on the decorative layer 54 and the resin coating layer 53. Thereafter, the surface of the second resin coating layer 55 is coated or printed with the lacquer coating mainly composed of the above-mentioned UV curable lacquer-containing coating, and in this state, it is irradiated with UV to be dried and cured to complete.

  Note that the resin coating layer and the lacquer-containing coating layer 56 can be formed on the decorative exterior plate 25 at the stage of parts before being completed as a door, or after foaming urethane and completing as a door. May be selected as appropriate.

  Since the decorative exterior plate 25 formed in this way forms the lacquer-containing coating layer 56 using a lacquer coating composition mainly composed of an ultraviolet curable lacquer-containing paint, it is tens of seconds when irradiated with ultraviolet rays. It can be dried and cured at a degree, and the productivity is remarkably improved as compared with the case of using a conventional lacquer paint, and mass production becomes possible. Moreover, since the lacquer-containing coating layer 56 can be dried and cured in about several tens of seconds, the lacquer coating can be applied repeatedly several times to increase the depth, and the productivity can be achieved even if applied several times. Can be made superior to the conventional lacquer coating.

  In addition, since the lacquer-containing coating layer 56 is formed through the resin coating layer 53, even if various processes are applied to the surface of the transparent exterior base material 51, the lacquer-containing coating layer 56 is firmly bonded and retained. Sufficient durability can be secured.

  In particular, in this embodiment, since the resin coating layer 53 and the second resin coating layer 55 are both made of a urethane resin having a strong adhesive force, more sufficient adhesion durability can be ensured.

  In addition, the resin coating layer 53 and the second resin coating layer 55 serving as the base coloring layer have different resin materials and resin compounding ratios, that is, the resin coating layer 53 serving as the base coloring layer is a transparent exterior base. The second resin coating film layer 55 has a good adhesion to the lacquer paint mainly composed of an ultraviolet curable lacquer-containing paint, and becomes a base colored layer with a resin material having a large adhesive strength to the material of the material 51 and a resin compounding ratio. The resin coating layer 53 can also be made of a resin material having a good adhesiveness or a resin compounding ratio, and in this way, it has a high adhesion durability to the transparent exterior substrate 51 of any material. The decorative exterior plate 25 can be used.

  In addition, the resin coating layer 53 serving as the base coloring layer adheres and holds the decorative layer 54, and the gold powder or colored powder constituting the decorative layer 54 is displaced when the second resin coating layer 55 is applied. The second resin coating layer 55 covers the decorative layer 54 while preventing the lacquered coating layer 56 from being coated with the decorative layer 54 and the resin coating. It is also possible to use a single material of only two resin coating layers 55 instead of two different materials with the film layer 53, in this embodiment, a homogeneous material of only a urethane-based resin coating layer, and lacquer coating on a different material. As compared with a lacquer-coated film layer formed by coating or the like, the reliability of the adhesion durability can be made higher.

  Furthermore, since the resin coating layer 52 is formed on the surface of the transparent exterior substrate 51, a decorative exterior plate having various colors can be obtained by using this as a base colored layer as in the present embodiment. In addition, for example, as shown in FIGS. 6 (a), 6 (b) and 6 (c), each door alone or the entire door is provided with a gradation of color shading X or a gradation for changing the color. An integral pattern (decorative layer) can be provided between the doors as indicated by Y in FIG.

  In addition, the shade of the color is such that the resin coating layer 53 serving as the base coloring layer is colored at a certain concentration, and several layers of lacquer coating mainly composed of an ultraviolet curable lacquer-containing coating are applied. It can also be applied by changing the film thickness of the lacquer-containing coating layer 56. In this case, since the light transmittance varies depending on the film thickness of the lacquer-containing coating layer 56, the light and shade appear when viewed from the outside. Further, the gradation such as light and shade can be formed by applying colored powder on the surface of the resin coating layer 53 serving as a base colored layer and changing the coating amount. In this case, a pattern is formed in addition to the light and shade. It can also be selected as needed.

In addition, the colored layer 57 on the back surface of the transparent exterior base material 51 is formed by painting such as a resin film or silk printing, and a coloring or light shining treatment made of a metallic pattern such as a hairline is formed. is there. Thereby, the coloring and pattern shown in FIGS. 6A, 6B, and 6C can be processed by the colored layer 57. FIG.

  Furthermore, the pattern of the resin coating layer 52, the lacquer-containing coating layer 56, and the decorative layer 54 on the front surface side of the transparent exterior substrate 51 is colored, and the coloring layer 57 on the back surface side of the transparent exterior substrate 51 is colored. It is also possible to imagine a pair of designs on the front and back with patterns and patterns, which can give a deeper sense of depth and expand the range of design.

  The appearance of the lacquer-containing coating layer 56 when viewed from the surface is brilliant by making the resin coating layer 53 serving as the base colored layer colorless and transparent or pale like the second resin coating layer 55. Can be made even higher in texture.

  On the other hand, the decorative exterior plate 25 formed as described above, when the lacquer-coated film layer 56 is formed, the lacquer-coated film layer 56 is cured in about several tens of seconds, but at the edge thereof, the liquid is applied. It may present a state like anyone.

  Therefore, there is a concern that an unsightly thing may occur when used as a refrigerator door in this state, but in this embodiment, the edge of the decorative exterior plate 25 is provided with an edge frame 24, and a portion where liquid dripping or the like is likely to remain. Can be configured in a position where it is difficult to see, or can be covered by the shape, so that it cannot be seen from the outside, and a good appearance can be maintained.

  In addition, the edge frame 24 is provided with the handle portion 31 and the lacquer-containing coating film layer 56 is formed, whereby the handle portion 31 can be hygienically held by the antibacterial property of the lacquer. Can also be obtained.

  Moreover, since the exterior base material 15 of the decorative exterior plate 25 is configured to apply the lacquer-containing coating layer 56 only on the front surface side, the back surface side of the exterior base material 15 can be held with a jig during painting. And productivity is improved.

(Embodiment 2)
FIG. 7 is an enlarged cross-sectional view and an enlarged front view of the decorative exterior plate in the second embodiment. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described. The description of the same effects as those in the first embodiment is omitted, and only different effects are described.

  The decorative exterior plate 25 according to the second embodiment has a plurality of decorative layers 54 formed on the surface of a resin coating layer 53 serving as a base colored layer. That is, the decorative layer 54 is composed of, for example, two layers 54a and 54b, which are formed using gold powder, colored powder, screw, foil, or the like. Furthermore, in this embodiment, the second decorative layer 61 is also formed on the surface of the lacquer-containing coating layer 56.

  As a result, in this decorative exterior plate 25, the decorative layer 54, for example, the maple, overlaps with 54a and 54b, so that a perspective can be given to the design. In addition, since the second decorative layer 61 is also formed on the surface of the lacquer-coated film layer 56, a sense of perspective is also expressed between the decorative layers 54a and 54b and the second decorative layer 61. be able to. Therefore, the texture of the decorative exterior board 25 can be made higher.

Moreover, the decorative exterior board 25 of this Embodiment 2 does not provide a printing layer in the back surface of the transparent exterior base material 51, but expresses the permeation | transmission state of the transparent exterior base material 51, The front side of the transparent exterior base material 51 The decorative layer 54 or the like can be shown as if it floats in the space, and the food placed on the back side from the transparent exterior base material 51 can be shown, or the electricity disposed on the back side of the transparent exterior base material 51 can be seen. It is possible to light a decoration device or the like through the transparent exterior substrate 51. Therefore, the range of the expression method of the decorative exterior board 25 can be further expanded.

(Embodiment 3)
FIG. 8 is a cross-sectional view of the decorative exterior plate 25 in the third embodiment. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, the description thereof is omitted, and only different parts will be described. The description of the same effects as those in the first embodiment is omitted, and only different effects are described.

  In the decorative exterior plate 25 of the third embodiment, a concave shaped portion 62 is formed on the surface of the transparent exterior base material 51 by cutting or the like, and a resin coating layer 53 and a decorative layer 54 serving as a base coloring layer are formed thereon. The second decorative layer 61 and the lacquer-containing coating layer 56 are formed.

  As a result, in this decorative exterior plate 25, the reflection of light by the concave surface of the concave shaped portion 62 differs depending on the angle at which the manner of light refraction of the lacquer-coated film layer 56 is viewed. The appearance can be changed and the texture can be further improved. In particular, if the concave portion 62 is colored, the change in appearance can be made clear and effective.

  As mentioned above, although an example of the device of the present invention and the decorative exterior plate used for the same has been shown with each embodiment, the present invention is not limited to the configuration illustrated in each of the above embodiments, Needless to say, it may be formed by combining the portions of the form, or the lacquer-containing coating layer may be formed as a plurality of layers, and various modifications can be made within the scope of the object of the present invention.

  Moreover, although the refrigerator was illustrated as an apparatus using the decorative exterior board 25 demonstrated in the said embodiment, this is an air conditioner, a washing machine, a microwave oven, a rice cooker, a vacuum cleaner, an air cleaner, an electric toothbrush, a system kitchen, etc. It can be applied to various appliances such as home electrical appliances, information communication equipment such as personal computers, audio / visual equipment such as stereos and televisions for homes and cars, etc. The outer side is decorated while being seen through, and the application method may be a state of being attached to a casing made of synthetic resin instead of as a plate material.

  The present invention can inexpensively mass-produce home appliances with high texture and decorative exterior plates used therefor, as well as home appliances such as refrigerators, information communication devices such as personal computers, audio / audio devices such as stereos and televisions, etc. It can be widely applied to various devices such as visual devices.

1 Refrigerator body (home appliance body)
10, 11, 12, 13, 14, 15 Door 23 Inner frame 24 Edge frame 25 Decorative exterior plate 29 Foam insulation 31 Handle part 51 Transparent exterior base material 52 Coating layer 53 Resin coating layer 54 Decorating layer 55 Second Resin coating layer 56 Lacquered coating layer 57 Colored layer 61 Second decorative layer 62 Concave shaped part

Claims (12)

A coating layer is formed on the transparent exterior base material of the home electric appliance main body constituting the appearance, and the outermost coating layer of the coating layer is a lacquer-containing coating layer, and the lacquer-containing coating layer is an ultraviolet ray. Home appliances made of lacquer paint with curable lacquer paint as the main component. 2. The home appliance according to claim 1, further comprising a storage chamber and a door for opening and closing the storage chamber, wherein the transparent exterior base material of the decorative exterior plate constituting the door has an outer frame edge fixed to the exterior member. machine. The household electrical appliance of Claim 2 which provided the handle part in the exterior member and gave the lacquer-containing coating-film layer also to the said handle part. The household electrical appliance according to claim 2 or 3, wherein the transparent exterior base material has a lacquer-containing coating layer only on the surface side. A plurality of doors are provided in the apparatus main body, and a pattern such as a lacquer by a coating layer formed on the transparent exterior base material constituting the door is formed so as to form one continuous pattern between the doors. 5. The home appliance according to any one of 4 to 4. A coating layer is formed on a transparent exterior base material, and the outermost layer of the coating layer is a lacquer-containing coating layer. The lacquer-containing coating layer is a lacquer coating mainly composed of an ultraviolet curable lacquer-containing coating. A decorative exterior material formed. The said coating-film layer is provided with the lacquered coating-film layer and the resin coating-film layer, and formed decorative layers, such as a picture, between either the said lacquer-containing coating-film layer or the said resin coating-film layer Item 6. The decorative exterior material according to Item 6. The decoration according to claim 6 or 7, wherein the coating layer includes a lacquer-containing coating layer and a resin coating layer, and a photoluminescent material is added to either the lacquer-containing coating layer or the resin coating layer. Exterior material. The decorative exterior material according to any one of claims 6 to 8, wherein a colored layer is provided on the back surface of the transparent exterior base material. The decorative exterior material according to claim 9, wherein the transparent exterior base material has a pair of designs of a pattern such as a lacquer by a coating layer on the front side and a colored layer on the back side. The decorative exterior material according to any one of claims 6 to 10, wherein a second decorative layer is formed on the surface of the lacquer-containing coating layer. The decorative exterior material according to any one of claims 6 to 11, wherein a coating layer is formed on an exposed portion including an end face of the transparent exterior base material.

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