JP2014135652A - Electronic apparatus, housing, and coating member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus, a housing, and a coating member which are less likely to be scratched.SOLUTION: An electronic apparatus includes: a housing 10 including a base material 11, a first layer 15 located at the outer side relative to the base material 11, and a second layer 17 which is located at the outer side relative to the first layer 15 and has a wear level higher than that of the first layer 15; and an electronic component housed in the housing 10. The second layer 17 is thinner than the first layer 15. The above object is attained by the electronic apparatus, the housing, and a coating member.

Description

  The present invention relates to an electronic device, a housing, and a coating member.

  Not only electronic devices but also many members and casings are painted. For example, there is a technique for preventing damage by using a UV ((ultraviolet) cured film on the outermost side of a base material. Patent Document 1 discloses a technique related to this.

JP 2008-180077 A

  The UV cured film coated on the outside of the substrate may be fragile and easily cracked or scratched even if it is too hard. Moreover, when the hardness of the coating film is low, the substrate may be damaged. Further, the UV cured film may have insufficient hardness when the coating film is thickened.

  An object of this invention is to provide the electronic device which is hard to be damaged, a housing | casing, and a coating member.

  An electronic device disclosed in the present specification includes a base material, a first layer outside the base material, and a second layer outside the first layer and having a higher wear rate than the first layer. A housing and an electronic component housed in the housing are provided.

  The housing disclosed in the present specification includes a base material, a first layer outside the base material, and a second layer outside the first layer and having a higher wear rate than the first layer. It is equipped with.

  The coated member disclosed in the present specification includes a base material, a first layer outside the base material, a second layer outside the first layer and having a higher wear rate than the first layer, It is equipped with.

  It is possible to provide an electronic device, a housing, and a coating member that are not easily damaged.

FIG. 1 is an external view of a smartphone. FIG. 2 is a cross-sectional view of the housing. FIG. 3 is a graph showing the difference in wear depth of coating films having different wear rates. FIG. 4 is a table showing the evaluation results of the difficulty of scratching the coating film.

  FIG. 1 is an external view of the smartphone 1. The smartphone 1 is an example of an electronic device. The smartphone 1 has a housing 10 and a display DP provided on the front surface of the housing 10. The display DP has a touch panel function. A housing 10 houses a printed circuit board P on which a CPU (Central Processing Unit) is mounted. The CPU and the printed circuit board P are examples of electronic components. The electronic component may be a battery or a sensor.

  FIG. 2 is a partial cross-sectional view of the outer wall of the housing 10. 2 shows the outside of the housing 10 and the lower side shows the inside of the housing 10. The housing 10 includes a base material 11, a decorative layer 13 outside the base material 11, a protective layer 15 outside the decorative layer 13, and a protective layer 17 outside the protective layer 15. Although the base material 11 is a plastic, it is not limited to this, A metal may be sufficient and an elastic member like rubber | gum may be sufficient. The wear rate of the protective layer 17 is larger than the wear rate of the protective layer 15, and the thickness of the protective layer 17 is thinner than the protective layer 15. The protective layer 15 includes at least one of an acrylic resin, an acrylic urethane resin, a resin containing polylactic acid, an epoxy resin, a polyester resin, and cellulose. The protective layer 17 includes at least one of an acrylic resin and an epoxy resin. Thereby, the housing | casing 10 is hard to get a damage | wound. The reason will be described below.

  FIG. 3 is a graph showing the difference in wear depth of coating films having different wear rates. The wear rate was measured by the MSE (Micro Slurry-jet Erosion) method for Sample A in which a coating film having a thickness of 15 μm was formed on the substrate and Sample B in which a coating film having a thickness of 10 μm was formed on the substrate. The coating film of sample A is an acrylic resin, and the coating film of sample B is a resin containing polylactic acid. The MSE method is a method in which a certain amount of fine particles are projected onto the film surface, the amount of wear (thickness reduction) is measured, and the strength of the film is evaluated by the wear rate. As a result, the wear rate of sample A was 3.1 μm / g, and the wear rate of sample B was 0.53 μm / g. The coating film of sample A having a larger wear rate wears more deeply with a smaller amount of projected particles. When a sample in which only one layer was coated on the base material was evaluated, it was found that a sample with a high wear rate was not easily damaged when rubbed with steel wool.

  Five types of samples were prepared by combining the above coating films, and each sample was evaluated by a steel wool test and a sand eraser rubbing test. FIG. 4 is a table showing the evaluation results of the difficulty of scratching the coating film. In the steel wool test, the steel wool was rubbed 5 times and the degree of damage was visually confirmed. Items that are not scratched are marked with ◎. In the steel wool test, the scratch resistance can be evaluated.

  In the sand eraser rubbing test, rubbing is performed by applying a weight of 1 kg using a sand eraser, and evaluation is performed by the number of times until the base material is exposed. The case where the base material was exposed at 5000 times or less was indicated by x, the case where the base material was exposed at 5000 to 10,000 times was indicated as Δ, and the case where the base material was exposed at 10000 times or more was indicated by ○. In the sand eraser rubbing test, wear resistance can be evaluated.

  Sample 1 is a sample coated with sample A with a thickness of 10 μm, Sample 2 is a substrate coated with sample A with a thickness of 25 μm, Sample 3 is a substrate coated with sample B with a thickness of 25 μm It is. Sample 4 is obtained by coating sample B with a thickness of 25 μm on the outside of the substrate and further coating sample A with a thickness of 10 μm on the outside. Sample 5 is obtained by coating sample A with a thickness of 10 μm on the outside of the substrate and further coating sample B with a thickness of 25 μm on the outside.

  As shown in FIG. 4, Samples 1 and 2 in which only the sample A having a high wear rate is coated on the base material have some durability against steel wool but low durability against sand eraser. I understood it. That is, Samples 1 and 2 were found to have scratch resistance but low wear resistance. Further, it was found that Sample 1 having a smaller thickness of Sample A has higher scratch resistance.

  Sample 3 in which only the sample B having a low wear rate was coated on the base material was found to have low durability against steel wool, but some durability against sand eraser. That is, Sample 3 was found to have low scratch resistance and only low wear resistance.

  Sample 4 with sample A having a high wear rate applied to the outermost side and sample B having a low wear rate applied thereto is less likely to be damaged against steel wool, and good results can be obtained even with sandblasting rubbing. It was. That is, Sample 4 was found to be excellent in both scratch resistance and wear resistance.

  Sample 5, which is coated on the outermost side with sample B with the lower wear rate and coated with sample A with the higher wear rate below, is less durable against steel wool, but has some durability against sand eraser. I found it. That is, Sample 5 was found to have low abrasion resistance but excellent wear resistance.

  From the above results, it was found that Sample 4 was excellent in both scratch resistance and wear resistance. Therefore, as shown in FIG. 2, by forming the protective layer 17 having a greater wear rate than the protective layer 15 on the outermost side, the housing 10 is less likely to be scratched and not easily penetrated (teared). It has become. Like the smart phone 1 of a present Example, this invention is effective for what a user always carries and uses, but it is not limited to this. In addition, the decorative layer 13 is not provided, and the protective layer 15 may be provided directly on the surface of the base material 11, or another layer is provided between the protective layer 15 and the base material 11. May be.

  The thickness of the outermost protective layer 17 is preferably 5 to 10 μm, and the thickness of the protective layer 15 below the protective layer 17 is preferably 10 to 30 μm, but is not limited thereto.

  The preferred embodiment of the present invention has been described in detail above, but the present invention is not limited to the specific embodiment, and various modifications can be made within the scope of the gist of the present invention described in the claims.・ Change is possible.

  In the said Example, although the smart phone was demonstrated to the example as an example of an electronic device, the electronic device may be other than that. Electronic devices are portable devices such as notebook computers, tablet computers, open / close and mobile phones, mobile TVs, electronic dictionaries, PDAs, game machines, cameras, music players, navigation devices, and portable projectors. There may be. The electronic device may be a pointing device such as a keyboard and a mouse, a controller, a telephone, a desktop computer, a monitor, a monitor with a built-in computer, a television, an audio, a projector, and other stationary devices. . Further, the present invention may be applied to other than the case. For example, it is a painted member coated with the above-mentioned layer, for example, a mouse pad, but is not limited thereto.

DESCRIPTION OF SYMBOLS 1 Smart phone 10 Case 11 Base material 15 Protective layer (1st layer)
17 Protective layer (second layer)
PR printed circuit board (electronic parts)

Claims (5)

A housing including a base material, a first layer outside the base material, a second layer outside the first layer and having a higher wear rate than the first layer;
And an electronic component housed in the housing.   The electronic device according to claim 1, wherein the second layer is thinner than the first layer. The first layer includes at least one of an acrylic resin, an acrylic urethane resin, a resin containing polylactic acid, an epoxy resin, a polyester resin, and cellulose.
The electronic device according to claim 1, wherein the second layer includes at least one of an acrylic resin and an epoxy resin. A substrate;
A first layer on the outside of the substrate;
And a second layer that is outside the first layer and has a higher wear rate than the first layer. A substrate;
A first layer on the outside of the substrate;
A coating member comprising: a second layer outside the first layer and having a higher wear rate than the first layer.

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