Resin mirror and cosmetic tool

Abstract

Provided are a resin mirror and a cosmetic tool that can suppress warping deformation due to heat. 【Solution means】The resin mirror 20 includes a plate-shaped base material 22 made of resin, a first resin film 21 that is thinner than the base material 22 and laminated so as to cover the front side of the base material 22, and a second resin film 23 that is thinner than the base material 22 and laminated so as to cover the back side of the base material 22. A reflective layer 21b mainly composed of metal is formed on the back side of the first resin film 21 or the front side of the second resin film 23. The resin mirror 20 reflects an object facing the surface of the first resin film 21 through the first resin film 21 or the first resin film 21 and the base material 22, which are disposed on the front side of the reflective layer 21b, with the reflective layer 21b. The first resin film 21 and the second resin film 23 are characterized in that their thicknesses and materials are set so as to have the same rigidity.

Description

Technical Field

[0001] The present invention relates to a resin mirror attached to a cosmetic tool or the like, particularly a resin mirror having heat resistance, and a cosmetic tool to which the resin mirror is attached.

Background Art

[0002] In recent years, resin mirrors made of resin have been manufactured from the viewpoints of weight reduction and easy disposal. Among them, resin mirrors that can prevent distortion due to environmental changes, for example, in the hot and humid state in summer, have been intensively studied.

[0003] As such a resin mirror, for example, in Patent Document 1 (conventional example), as shown in FIG. 13, a resin mirror 110 is disclosed which is composed of a transparent resin plate 111, a transparent overcoat 112 applied to the surface of the resin plate 111, a reflective metal layer 113 such as aluminum or silver formed on the back surface of the resin plate 111, and a protective coating film 114 applied to the back surface of the reflective metal layer 113.

[0004] According to the resin plate 111 of Patent Document 1, by using an amorphous polyolefin material with a low water absorption rate for the resin plate 111, deformation such as warping hardly occurs in the resin plate 110 even under high humidity conditions in summer, and distortion on the surface of the resin plate 111 can be suppressed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Such a resin plate 111 of Patent Document 1 is generally used because it is simple to mold a resin of an amorphous polyolefin material by extrusion molding.

[0007] However, when molding a resin of an amorphous polyolefin material by extrusion molding, stress is generated along the extrusion direction, and this stress remains in the resin plate 111 even after the resin plate 111 is cured.

[0008] This residual stress is not noticeable due to the curing of the resin plate 111 under low-temperature conditions. However, under high-temperature conditions such as when the room temperature rises, the resin plate 111 of the thermoplastic amorphous polyolefin material becomes soft.

[0009] Therefore, when the resin mirror 110 including the resin plate 111 is placed under high-temperature conditions such as inside a car in summer, the resin mirror 110 as a whole may bend due to the bending caused by the residual stress of the resin plate 111 and the bending caused by the bimetal effect due to the different coefficients of thermal expansion between the resin plate 111 and the reflective metal layer 113, and there is a risk that the resin mirror 110 will also bend.

[0010] Particularly when the resin plate 111 is thin, the rigidity of the resin plate 111 is low, so there is a significant risk of being affected by bending due to residual stress and bending due to the bimetal effect under such high-temperature conditions.

[0011] In addition, since the resin mirror 110 is formed of a thermoplastic resin, once the resin mirror 110 is deformed, it may not return to its original shape after deformation, and there is also a risk that it will no longer be usable as a mirror.

[0012] The present invention has been made in view of the above problems, and an object thereof is to provide a resin mirror and a cosmetic tool that can suppress warping deformation due to heat.

Means for Solving the Problems

[0013] The invention according to claim 1 made to solve the above problems includes a plate-shaped base material made of resin, a first resin film that is thinner than the base material and laminated so as to cover the front side of the base material, , having a front film layer made of resin a first resin film, and a second resin film that is thinner than the base material and laminated so as to cover the back side of the base material, and the first resin film is formed on the back surface of the front film layer A reflective layer mainly composed of a metal has Disposed on the front side of the reflective layer the front film layer A resin mirror that transmits light and reflects an object facing the surface of the first resin film with the reflective layer, The thicknesses and materials of the front film layer and the second resin film are the same. Characterized by this.

[0014] According to the invention described in claim 1, the first resin film and the second resin film are set in terms of thickness and material so as to have the same rigidity as each other, so that equal stresses are generated in each other during heating. For this reason, when heat is applied to the resin mirror, the stress generated toward the front side of the resin mirror by the first resin film and the stress generated toward the back side of the resin mirror by the second resin film become equal, and warping deformation of the base material can be suppressed.

[0015] Since the thicknesses and materials of the first resin film and the second resin film are the same, when heated, the stress generated by the first resin film toward the front side of the resin lens is the same as the stress generated by the second resin film toward the back side of the resin lens. Therefore, even when heat is applied to the resin lens, the upward warping deformation of the substrate in the vertical direction can be suppressed by the uniform stress in the vertical direction by the first resin film and the second resin film.

[0016] Furthermore, by using the first resin film and the second resin film having the same thickness and material, the common use of members can be achieved, and an increase in manufacturing cost and complication of the manufacturing process due to the use of a plurality of different members can be prevented.

[0017] The invention according to claim 2 is a resin mirror comprising a plate-shaped substrate made of resin, a first resin film that is thinner than the substrate and is laminated so as to cover the front side of the substrate and is disposed on the front side of the substrate, and a second resin film that is thinner than the substrate and is laminated so as to cover the back side of the substrate and has a back film layer made of resin. The second resin film is formed on the front surface of the back film layer and has a reflective layer mainly composed of metal. The resin mirror reflects an object facing the surface of the first resin film by passing through the first resin film disposed on the front side of the reflective layer and the substrate and using the reflective layer. The thicknesses and materials of the front film layer and the back film layer are the same.

[0018] The invention described in claim 3 is a cosmetic tool comprising cosmetic powder applied to a user's face or the like, the resin mirror described in claim 1 or 2, and a cosmetic tool body filled with the cosmetic powder and having the resin mirror attached thereto, characterized in that the thickness of the base material is 1.5 mm or more and less than 3.0 mm.

[0019] According to the invention described in claim 3, a cosmetic powder that denatures at a temperature of 55°C or higher is generally used. In the resin mirror used in a cosmetic tool using this cosmetic powder, a heat resistance temperature at 50°C, compactness, and rigidity are required. By setting the thickness of the base material of the resin mirror to 1.5 mm or more, the rigidity of the resin mirror during manufacturing can be ensured. By setting it to less than 3.0 mm, it is possible to reduce the material cost and miniaturize the resin mirror while satisfying the requirements at the required heat resistance temperature (50°C or lower). Therefore, it is possible to achieve miniaturization and reduction of manufacturing costs while ensuring the heat resistance and rigidity required for cosmetic tools.

Advantages of the Invention

[0020] As described above, according to the resin mirror of the present invention, since the thicknesses and materials of the first resin film and the second resin film are formed to have the same rigidity, stress acts substantially uniformly in the vertical direction of the base material. Therefore, even when heat is applied to the resin mirror, the uniform stress in the vertical direction can suppress the one-sided warping deformation in one direction in the vertical direction due to heat.

Brief Description of the Drawings

[0021] [FIG. 1] It is a schematic perspective view of a cosmetic tool with a resin mirror according to the first embodiment of the present invention in an open state. [FIG. 2] It is a schematic front view of the cosmetic tool in FIG. 1 in a state where it is opened 180 degrees. [FIG. 3] It is a schematic cross-sectional view taken along line A-A of FIG. 2. [FIG. 4] It is a perspective view of the resin mirror of FIG. 1. [FIG. 5] It is an exploded perspective view of the resin mirror of FIG. 4 disassembled. [FIG. 6] It is a flowchart showing the manufacturing method of the resin mirror of FIG. 4. [FIG. 7] It is a test condition table showing the first resin film 21, base material 22, second resin film 23, adhesive, and adhesion order conditions of Examples 1 to 6 and Comparative Examples 1 to 5 of the heat and moisture resistance confirmation test. [FIG. 8] It is a warp and bulge result list table 1 showing the experimental results of warp and bulge of Examples 1 to 6 of the heat and moisture resistance confirmation test. [FIG. 9] It is a warp and bulge result list table 2 showing the experimental results of warp and bulge of Comparative Examples 1 to 5 of the heat and moisture resistance confirmation test. [FIG. 10] It is a thickness and material experimental result table showing the evaluation results of the warp after heating of Examples 1 to 5 and Comparative Examples 1 to 7 in the thickness and material comparison experiment. [FIG. 11] It is a schematic perspective view of a cosmetic tool with a resin mirror according to the second embodiment of the present invention in an open state. [FIG. 12] It is a schematic cross-sectional view taken along line B-B of FIG. 11. [FIG. 13] It is a cross-sectional view showing a compact container with a resin mirror according to a conventional example.

Embodiments for Carrying Out the Invention

[0022] (First Embodiment) Hereinafter, with reference to the drawings, the cosmetic tool 1 according to the first embodiment of the present invention will be described.

[0023] FIG. 1 is a schematic perspective view of a cosmetic tool 1 with a resin mirror 20 according to the first embodiment of the present invention, FIG. 2 is a schematic front view of the cosmetic tool 1 of FIG. 1 in a state opened 180 degrees, FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2, FIG. 4 is a perspective view of the resin mirror 20 of FIG. 1, and FIG. 4 is an exploded perspective view of the resin mirror 20 of FIG. 3.

[0024] For the sake of explanation hereinafter, the height direction of the cosmetic tool 1 will be described as the Z-axis (the front-back direction of the paper surface in FIG. 2), the depth direction as the X-axis (the up-down direction of the paper surface in FIG. 2), and the width direction as the Y-axis (the left-right direction of the paper surface in FIG. 2).

[0025] In this specification, "bulge" refers to bubbles generated between the base material 22 and the first resin film 21 or the second resin film 23 when the resin lens 20 is in a heated state.

[0026] Also, "warp" means that when heat is applied to the resin lens 20, the resin lens 20 warps upward and deforms into a substantially U shape. In this specification, a state where the end portion of the resin lens 20 warps upward by 0.5 mm or more with respect to the central portion of the resin lens 20 is described as "warp".

[0027] Furthermore, in FIGS. 3 to 5, the front film layer 21a is illustrated as being thinner than the second resin film 23, but these are for convenience of explanation, and as will be described later, the front film layer 21a and the second resin film 23 shall have the same thickness.

[0028] As shown in FIG. 1, the cosmetic tool 1 includes a cosmetic tool body 10 formed such that a lid body 11 described later and a cosmetic container 12 described later are rotatably attached to each other and foldable, a resin lens 20 attached to the lid body 11 of the cosmetic tool body 10, and a cosmetic powder 30 filled with powder to be applied to the user's face or the like and attached to the cosmetic container 12 of the cosmetic tool body 10.

[0029] The cosmetic tool body 10 includes a lid body 11, a cosmetic container 12 rotatably attached to the lid body 11, and a rotation support portion 13 that rotatably connects the lid body 11 and the cosmetic container 12. The cosmetic tool body 10 is formed of, for example, resin so as to be easily disposable. The resin used for the cosmetic tool body 10 is preferably formed of a heat-resistant resin such as polyethylene or polypropylene so as to withstand high-temperature situations such as inside a car in summer. The cosmetic tool body 10 is formed to be square in a folded state, but the shape of the cosmetic tool body 10 is not limited to a square shape, and may be a pentagon, a hexagon, other polygons, a circular shape, an elliptical shape, etc., as long as the lid body 11 and the cosmetic container 12 are rotatably attached.

[0030] As shown in FIGS. 1 to 3, a lens mounting portion 11a to which a resin lens 20 can be attached is formed on the lid body 11.

[0031] The lens mounting portion 11a is formed on the lid body 11 so as to face the inside (lower side in the Z-axis direction) in a state where the cosmetic tool body 10 is folded. The lens mounting portion 11a is a depression having a shape slightly larger than that of the resin lens 20 so that the resin lens 20 can be attached, and has substantially the same shape as the resin lens 20 (a substantially rectangular shape having a shape in which both end portions in the longitudinal direction are curved so as to draw a curve in the longitudinal direction so that the four vertices are obtuse angles).

[0032] As shown in FIGS. 1 and 2, the shape of the lid body 11 is formed in a square shape in a front view in the present embodiment, but is not limited to a square shape, and may be a pentagon, a hexagon, other polygons, a circle, an ellipse, or the like.

[0033] As shown in FIGS. 1 and 2, a powder mounting portion 12a to which a cosmetic powder 30 can be attached is formed on the cosmetic container 12.

[0034] The powder mounting portion 12a is formed on the cosmetic container 12 so as to face the inside (upper side in the Z-axis direction) in a state where the cosmetic tool body 10 is folded. The powder mounting portion 11a is a depression having a shape slightly larger than that of the cosmetic powder 30 so that the cosmetic powder 30 can be attached, and is formed to have substantially the same shape as the cosmetic powder 30 (a square shape in the present embodiment).

[0035] As shown in FIGS. 1 and 2, the shape of the cosmetic container 12 preferably has substantially the same shape as the lid body 11 (a quadrilateral in the present embodiment) in a plan view so as to overlap the lid body 11 in a state where the cosmetic tool body 10 is folded.

[0036] The rotation support portion 13 rotatably supports the end portion of the lid body 11 and the end portion of the cosmetic container 12, and a known one such as a hinge is used. The rotation support portion 13 is arranged along the Y-axis, and rotatably supports the lid body 11 and the cosmetic container 12 around the Y-axis.

[0037] As shown in FIGS. 1 and 2, the resin lens 20 is a resin lens attached to the lens attachment portion 11a of the lid body 11. As shown in FIGS. 3 to 5, it includes a plate-shaped base material 22, a transparent first resin film 21 laminated so as to cover the front side (upper surface in the Z-axis direction) of the base material 22, and a second resin film 23 laminated so as to cover the back side (lower surface in the Z-axis direction) of the base material 22.

[0038] The resin lens 20 is formed in a substantially horizontally long rectangular shape. Specifically, as shown in FIG. 2, the resin lens 20 is formed in a horizontally long rectangular shape where the width direction is longer than the depth direction (X-axis direction).

[0039] The base material 22 is formed of a resin such as PET (polyethylene terephthalate). The thickness of this base material 22 is preferably set within the range of 1.5 to 3.0 mm from the viewpoints of ensuring durability and weight reduction. In this embodiment, the thickness of the base material 22 is set to 1.5 mm.

[0040] The base material 22 is formed by extruding it into a plate shape by extrusion molding and then forming it into a substantially rectangular shape by pressing. It is formed by cutting in this pressing process so that the longitudinal direction is along the direction perpendicular to the extrusion direction of the extrusion molding. The thickness of the base material 22 is preferably 1.5 mm or more and less than 3.0 mm. In this embodiment, the thickness of the base material 22 is 1.5 mm.

[0041] As shown in FIG. 3, the first resin film 21 is a mirror film having a transparent resin front film layer 21a, a reflective layer 21b vapor-deposited on the back side (lower side in the Z-axis direction) of this front film layer 21a, a hard coat layer 21c applied so as to cover the front side (upper side in the Z-axis direction) of the front film layer 21a, and a protective layer 21d applied so as to cover the back side (lower side in the Z-axis direction) (front side of the base material 22) of the reflective layer 21b.

[0042] The ratio of the thickness of the first resin film 21 to the thickness of the base material 22 (thickness of the first resin film 21 / thickness of the base material 22) is preferably from 0.17 to 0.033 from the viewpoints of suppressing warping and reducing the weight of the resin lens 20. In the present embodiment, the thickness of the first resin film 21 is 50 μm, that is, the ratio of the thickness of the first resin film 21 to the thickness of the base material 22 (thickness of the first resin film 21 / thickness of the base material 22) is set to 0.033. Note that the thicknesses of the reflective layer 21b, the hard coat layer 21c, and the protective layer 21d are extremely thin compared to the thickness of the front film layer 21a and thus can be ignored.

[0043] The first resin film 21 is adhered to the front side of the base material 22 with an adhesive. As this adhesive, from the viewpoints of preventing blistering and warping, it is preferable to use an adhesive that takes measures against outgassing (gas permeability) (an acrylic adhesive for anti - blister). In the present embodiment, for example, Air Coupe Neo (manufactured by Nisshin Shinwa Co., Ltd.) is used as such an adhesive. By adhering the base material 22 and the first resin film 21 with an adhesive that takes measures against outgassing in this way, generation of air bubbles between the base material 22 and the first resin film 21 can be suppressed, and generation of blistering can be suppressed.

[0044] The front film layer 21a is a colorless and transparent sheet - like resin. The material of the front film layer 21a is preferably a PET resin. In the present embodiment, the thickness of the front film layer 21a is 50 μm. The thicknesses of the reflective layer 21b, the hard coat layer 21c, and the protective layer 21d are extremely thin compared to the thickness of the front film layer 21a, so the thickness of the front film layer 21a is almost equal to the thickness of the first resin film 21.

[0045] The reflective layer 21b is a thin layer formed by vapor - depositing aluminum on the back side of the front film layer 21a. By vapor - depositing the reflective layer 21b on the back side of the front film layer 21a, the reflective layer 21b can be protected by the front film layer 21a, and peeling and damage of the reflective layer 21b can be suppressed. The reflective layer 21b reflects an object facing the surface of the first resin film 21.

[0046] The hard coat layer 21c is a thin layer coated so as to cover the surface of the front film layer 21a, and is applied to suppress scratches and dirt on the front film layer 21a. As the hard coat layer 21c, a hard coat agent cured by a UV curing type or any other method is used.

[0047] The protective layer 21d is a thin layer coated on the back side of the reflective layer 21b, and is applied to suppress peeling of the reflective layer 21b. As the protective layer 21d, for example, a protective agent cured by a UV curing type or any other method is used.

[0048] The second resin film 23 is a film adhered to the lower side of the base material 22, and its thickness and material are set so as to have the same rigidity as the first resin film 21.

[0049] In this embodiment, the second resin film 23 is set to 50 μm, which is substantially the same thickness as the first resin film 21. Here, the so-called substantially the same thickness includes the range within ±1 μm of the thickness of the first resin film 21.

[0050] The material of the second resin film 23 is the same as the material of the front film layer 21a of the first resin film 21. Specifically, in this embodiment, the material of the second resin film 23 is formed of the same PET resin as the material of the film layer 21a of the first resin film 21.

[0051] The second resin film 23 is adhered to the back side of the base material 22 with an adhesive. From the viewpoints of preventing swelling and warping, it is preferable to use, for example, an adhesive with outgas countermeasures.

[0052] (Effect) According to the resin lens 20 according to this embodiment, the thicknesses and materials of the first resin film 21 and the second resin film 23 are thinner than those of the base material 22, and are formed of materials having substantially the same thickness and the same characteristics as each other, and have the same rigidity. Therefore, when heated, the stress generated by the first resin film 21 toward the front side of the resin lens 20 is the same as the stress generated by the second resin film 23 toward the back side of the resin lens 20. For this reason, even when heat is applied to the resin lens 20, the upward warping deformation of the base material 22 in the vertical direction can be suppressed by the uniform stress in the vertical direction by the first resin film 21 and the second resin film 23.

[0053] Moreover, by adopting a configuration in which the thicknesses and materials of the first resin film 21 and the second resin film 23 are the same, it is possible to share the used members and prevent an increase in manufacturing cost and complication of the manufacturing process due to the use of a plurality of different members.

[0054] In addition, since the resin lens 20 of this embodiment is formed in a substantially rectangular shape that is horizontally long, the warping deformation can be dispersed in the longitudinal direction by the stress in the longitudinal direction (Y-axis direction) being larger than the stress in the short-side direction (X-axis direction). Thereby, compared with the case where the longitudinal direction and the short-side direction are deformed with the same stress, the distorted deformation during the warping deformation can be suppressed.

[0055] Furthermore, the reflective layer 21b is formed on the back side of the film layer 21a of the first resin film 21, and the first resin film 21 further includes a hard coat layer 21c that covers the surface and a protective layer 21d that protects the back side of the reflective layer 21a. Therefore, the bending of the reflective layer 21b can be further suppressed by the rigidity of the hard coat layer 21c, and good reflection by the reflective layer 21b can be ensured.

[0056] Cosmetic powder 30 that denatures at a temperature of 55°C or higher is generally used. In the resin mirror 20 used in the cosmetic tool 1 using this cosmetic powder 30, a heat resistance temperature, compactness, and rigidity at 50°C are required. By attaching the resin mirror 20 to the cosmetic tool body 10 filled with the cosmetic powder 30, while having this heat resistance requirement, by setting the thickness of the base material 22 of the resin mirror 20 to 1.5 mm or more, the rigidity of the resin mirror 20 during manufacturing can be ensured, and by setting it to less than 3.0 mm, reduction of material costs and miniaturization of the resin mirror 20 can be achieved. For this reason, while ensuring the heat resistance and rigidity required for the cosmetic tool 1, miniaturization and reduction of manufacturing costs can also be achieved.

[0057] Furthermore, by providing the reflective layer 21b on the front side of the base material 22, it is not necessary to make the base material 22 of a transparent material, so the manufacturing cost of the base material 22 can be reduced.

[0058] (Manufacturing method) Next, the manufacturing method of the resin mirror 20 according to this embodiment will be described. FIG. 6 is a flowchart showing the manufacturing method of the resin mirror 20.

[0059] As shown in FIG. 6, the manufacturing method of the resin mirror 20 includes an extrusion molding step (STEP2) of extruding PET resin to mold the base material 22, a first resin film manufacturing step (STEP3) of manufacturing the first resin film 21, an adhesion step (STEP4) of adhering the second resin film 23 to the back side of the base material 22 molded in the extrusion molding step and adhering the first resin film 21 to the front side of the base material 22, and a cutting step (STEP5) of cutting the plate-shaped resin mirror plate to which the first resin film 21 and the second resin film 23 are adhered to the base material into a predetermined size.

[0060] In the extrusion molding step, the operator puts PET resin into the extrusion molding machine and molds the base material 22 by extruding the PET resin melted inside the extrusion molding machine in a flat plate shape (STEP1, 2).

[0061] In the film manufacturing process, a reflective layer 21a is formed by vapor-depositing aluminum on the back surface of a previously prepared front film layer 21a made of PET. Also, a hard coat layer 21c is formed by applying a hard coat agent to the surface of the front film layer 21a. Further, a protective layer 21d is formed by applying a protective agent to the back side of the reflective layer 21b. Thus, the first resin film 21 can be molded (STEP3).

[0062] In the adhesion process, the second resin film 23 is adhered to the back side of the base material 22 formed in the extrusion molding process using an adhesive with outgassing countermeasures (STEP4).

[0063] Also, similarly, the first resin film 21 is attached to the front side of the base material 22 using an adhesive with outgassing countermeasures to manufacture a resin platen (STEP4). When adhering the first resin film 21 to the front side of the base material 22, it is adhered so that the protective layer 21d of the first resin film 21 contacts the surface of the base material 22. By adhering in this way, the reflective layer 21b can be more firmly protected by the front film layer 21a of the first resin film 21.

[0064] The resin platen thus manufactured is further cut, etc. in a Thomson type so that the longitudinal direction of the base material 22 is along the direction perpendicular to the extrusion direction of the extruder to form a resin mirror 20 (STEP5, 6). In the present embodiment, by processing it into a horizontally long substantially rectangular shape, it can be used as the mirror of the cosmetic tool 1.

[0065] In the resin mirror 20 of the present embodiment, after adhering the second resin film 23 to the back side of the base material 22, the first resin film 21 is adhered to the front side of the base material 22, so that the surface of the first resin film 21 is located on the lower surface during manufacturing, thereby preventing it from being damaged.

[0066] That is, in the resin mirror 20 of the present embodiment, the first resin film 21 including the reflective layer 21b is not damaged when the second resin film 23 is adhered to the base material 22, so that the object reflected by the reflective layer 21b can be clearly visually recognized from the outside.

[0067] Also, by manufacturing the resin lens 20 by extrusion molding, mass production can be enabled.

[0068] Furthermore, by setting the longitudinal direction of the base material 22 to a direction perpendicular to the extrusion direction of the extrusion molding, the length in the direction in which the base material 22 itself is likely to bend (the fiber direction of the base material 22) is shortened, and it is possible to further prevent the base material 22 from bending due to residual stress.

[0069] Moreover, by setting the thickness of the base material 22 of the present embodiment to 1.5 mm or more, the rigidity of the base material 22 is ensured, and when the first resin film 21 and the second resin film 23 are adhered to the base material 22 by adhesion or the like, it is possible to prevent the base material 22 from bending or the like.

[0070] (Heat and humidity resistance confirmation experiment) Next, in order to confirm the heat and humidity resistance of the resin lens 20 at 50°C and 90% humidity, Examples 1 to 6 and Comparative Examples 1 to 5 in which the first resin film 21, the base material 22, the second resin film 23, the adhesive, and the adhesion order conditions were appropriately changed were left in a thermo-hygrostat for a certain period of time, and then the warpage and swelling were confirmed after leaving them at room temperature for 24 hours or more. The experiment will be described.

[0071] FIG. 7 is a test condition table showing the first resin film 21, the base material 22, the second resin film 23, the adhesive, and the adhesion order conditions of Examples 1 to 6 and Comparative Examples 1 to 5, FIG. 8 is a warpage and swelling result list table 1 showing the warpage and swelling experimental results of Examples 1 to 6, and FIG. 9 is a warpage and swelling result list table 2 showing the warpage and swelling experimental results of Comparative Examples 1 to 5.

[0072] As initial conditions, the following Examples 1 to 6 and Comparative Examples 1 to 5 in a rectangular shape as shown in FIG. 7 were created. Note that the extrusion direction of the base material 22 is the short side direction (vertical direction), and the base material 22 was cut by pressing so that the extrusion direction of the extrusion molding machine is perpendicular to the longitudinal direction of the base material 22. Conversely, the extrusion direction of the base material 22 is the longitudinal direction, and the base material 22 was pressed and cut so that the extrusion direction of the extrusion molding machine is along the longitudinal direction of the base material 22.

[0073] In Example 1, a mirror film (hereinafter simply referred to as "mirror film") obtained by vapor-depositing aluminum on one side of a PET resin film was used as the first resin film 21, a mirror film was used as the second resin film 23, A-PET was used as the base material 22, and an outgassing countermeasure product was used as the adhesive. As the adhesion order condition, first, the first resin film 21 was attached to the surface of the base material 22 (adhesion STEP1), and then the second resin film 23 was attached to the back surface of the base material 22 (adhesion STEP2). The extrusion direction of the base material 22 in the short side direction (vertical direction) was used.

[0074] In Example 2, a mirror film was used as the first resin film 21, a mirror film was used as the second resin film 23, A-PET was used as the base material 22, and an outgassing countermeasure product was used as the adhesive. As the adhesion order condition, first, the second resin film 23 was attached to the back surface of the base material 22 (adhesion STEP1), and then the first resin film 21 was attached to the surface of the base material 22 (adhesion STEP2). The extrusion direction of the base material 22 in the short side direction (vertical direction) was used.

[0075] In Example 3, a mirror film was used as the first resin film 21, a clear film made of PET resin was used as the second resin film 23, A-PET was used as the base material 22, and a normal product with a small effect of outgassing countermeasures was used as the adhesive. The mirror film and the clear film have substantially the same rigidity. As the adhesion order condition, first, the second resin film 23 was attached to the back surface of the base material 22 (adhesion STEP1), and then the first resin film 21 was attached to the surface of the base material 22 (adhesion STEP2). The extrusion direction of the base material 22 in the short side direction (vertical direction) was used.

[0076] In Example 4, a mirror film was used as the first resin film 21, a mirror film was used as the second resin film 23, A-PET was used as the base material 22, and an outgas countermeasure product was used as the adhesive. As the adhesion order condition, first, the first resin film 21 was attached to the surface of the base material 22 (adhesion STEP1), and then the second resin film 23 was attached to the back surface of the base material 22 (adhesion STEP2). The extrusion direction of the base material 22 was in the longitudinal direction (lateral direction).

[0077] In Example 5, a mirror film was used as the first resin film 21, a mirror film was used as the second resin film 23, A-PET was used as the base material 22, and an outgas countermeasure product was used as the adhesive. As the adhesion order condition, first, the second resin film 23 was attached to the back surface of the base material 22 (adhesion STEP1), and then the first resin film 21 was attached to the surface of the base material 22 (adhesion STEP2). The extrusion direction of the base material 22 was in the longitudinal direction (lateral direction).

[0078] In Example 6, a mirror film was used as the first resin film 21, a clear film was used as the second resin film 23, A-PET was used as the base material 22, and a normal product with a small effect of outgas countermeasure was used as the adhesive. The mirror film and the clear film have substantially the same rigidity. As the adhesion order condition, first, the second resin film 23 was attached to the back surface of the base material 22 (adhesion STEP1), and then the first resin film 21 was attached to the surface of the base material 22 (adhesion STEP2). The extrusion direction of the base material 22 was in the longitudinal direction (lateral direction).

[0079] In Comparative Example 1, the second resin film 23 was not used. A mirror film was used as the first resin film 21, A-PET was used as the base material 22, and an outgas countermeasure product was used as the adhesive. As the adhesion order condition, the first resin film 21 was only bonded to the surface of the base material 22. The extrusion direction of the base material 22 was in the short side direction (vertical direction).

[0080] In Comparative Example 2, the second resin film 23 was not used. A mirror film was used as the first resin film 21, A-PET was used as the base material 22, and an outgassing countermeasure product was used as the adhesive. As the adhesion order condition, the first resin film 21 was bonded only to the back surface of the base material 22. The extrusion direction of the base material 22 was the short side direction (vertical direction).

[0081] In Comparative Example 3, the second resin film 23 was not used. A mirror film was used as the first resin film 21, A-PET was used as the base material 22, and an outgassing countermeasure product was used as the adhesive. As the adhesion order condition, the first resin film 21 was bonded only to the front surface of the base material 22. The extrusion direction of the base material 22 was the long side direction (horizontal direction).

[0082] In Comparative Example 4, the second resin film 23 was not used. A mirror film was used as the first resin film 21, A-PET was used as the base material 22, and an outgassing countermeasure product was used as the adhesive. As the adhesion order condition, the first resin film 21 was bonded only to the back surface of the base material 22. The extrusion direction of the base material 22 was the long side direction (horizontal direction).

[0083] In Comparative Example 5, A-PET (Amorphous-PET) was used as the base material 22 without using the first resin film 21, the second resin film 23, and the adhesive.

[0084] Regarding the measurement conditions, assuming the transport environment of the resin mirror 20, Examples 1 to 6 and Comparative Examples 1 to 5 were placed in a constant temperature and humidity chamber for 10 days. The temperature of the constant temperature and humidity chamber was set to 50°C, which is the heat resistance temperature required for the cosmetic powder 30, and the humidity of the constant temperature and humidity chamber was set to 90%.

[0085] Next, as shown in FIG. 8, the results of Examples 1 to 6 will be described.

[0086] Regarding the mapping property, those judged to have no distortion or abnormality are marked as "○", those with a sense of discomfort and whose appearance changes depending on the distance used and the direction of deformation are marked as "△", and those with distorted mapping and judged to be abnormal are marked as "×".

[0087] In Example 1, neither swelling nor warping occurred immediately after any of the first to third tests, and the mapability was "○".

[0088] In Example 2, in 2 out of the 3 tests, neither swelling nor warping occurred immediately after the tests, and the mapability was "○". However, in 1 test, although no swelling occurred, a warp of 0.5 mm occurred in the short side direction immediately after the test and did not return even after standing at room temperature, so it was "×".

[0089] In Example 3, a large number of swellings occurred in all of the first to third tests, there was a warp of 0.2 mm in the short side direction, and it did not return even after standing at room temperature, so the mapability was "△".

[0090] In Example 4, neither swelling nor warping occurred immediately after any of the first to third tests, and the mapability was "○".

[0091] In Example 5, in 2 out of the 3 tests, neither swelling nor warping occurred immediately after the tests, and the mapability was "○". However, in 1 test, although no swelling occurred, a warp of 0.5 mm occurred in the longitudinal direction immediately after the test and did not return even after standing at room temperature, so it was "×".

[0092] In Example 6, a large number of swellings occurred in all of the first to third tests, there was a warp of 0.2 mm in the longitudinal direction, and it did not return even after standing at room temperature, so the mapability was "△".

[0093] Next, as shown in FIG. 9, the results of Comparative Examples 1 to 5 will be described.

[0094] In Comparative Example 1, no swelling occurred in any of the first to third tests, but in the first test, a warp of 0.75 mm occurred in the short side direction and did not return even after standing at room temperature, and the mapability was "×". In the second test, a warp of 1.0 mm occurred in the short side direction and did not return even after standing at room temperature, and the mapability was "×". In the third test, a warp of 0.5 mm occurred in the short side direction and did not return even after standing at room temperature, and the mapability was "×".

[0095] In Comparative Example 2, no swelling occurred in any of the first to third times. However, in the first time, a warp of 0.75 mm occurred in the short side direction, and the warp did not return even after standing at room temperature, and the imaging property was "×". In the second time, a warp of 1.0 mm occurred in the short side direction, and after standing at room temperature, there was still a warp of 0.75 mm, and the imaging property was "×". In the third time, a warp of 1.0 mm occurred in the short side direction, and the warp did not return even after standing at room temperature, and the imaging property was "×".

[0096] In Comparative Example 3, no swelling occurred in any of the first to third times. However, in any of the first to third times, a warp of 0.5 mm occurred in the longitudinal direction, and the warp hardly returned even after standing at room temperature, and the imaging property was "×".

[0097] In Comparative Example 4, swelling occurred at one place in one of the three tests. In any of the first to third times, a warp of about 0.5 mm occurred in the longitudinal direction, and the warp hardly returned even after standing at room temperature, and the imaging property was "×".

[0098] In Comparative Example 5, in Test Piece 0 using A-PET alone, a warp of 1.0 mm occurred in the short side direction immediately after the test, but after standing at room temperature, it returned to a warp of 0.2 to 0.5 mm in the short side direction.

[0099] From the results of this experiment, as in Comparative Examples 1 to 5, when using only the base material 22 or when adhering the resin film (the first resin film 21) only to one side of the base material 22, large warps occurred and the imaging properties were all "×". On the contrary, when resin films (the first resin film 21 and the second resin film 23) were adhered to both sides of the base material 22 as in Examples 1 to 6, the occurrence of warps was significantly suppressed.

[0100] Also, as in Examples 1 and 4, when the first resin film 21 was first adhered to the surface of the base material 22 and then the second resin film 23 was adhered to the back surface of the base material 22, no warp occurred during any of the three tests, and all the imaging properties were "○".

[0101] On the other hand, when the second resin film 23 is first adhered to the back surface of the base material 22 and then the first resin film 21 is adhered to the front surface of the base material 22 as in Examples 2 and 5, in both cases, warping did not occur twice during the three tests and the imaging property was "○", but in both cases, there was a sample in which warping of 0.5 mm occurred once and the imaging property became "×".

[0102] From this, as in Examples 1 and 4, by first adhering the first resin film 21 to the front surface of the base material 22 and then adhering the second resin film 23 to the back surface of the base material 22, it was found that the occurrence of warping may be further suppressed.

[0103] That is, by first adhering the first resin film 21 including the reflective layer 21b to the base material 22, the adhesion state of the second resin film 23 to the base material 22 is not affected, so the reflective layer 21b can be adhered in a flat state, and there is a possibility that the warping of the reflective layer 21b itself can be reduced.

[0104] In this embodiment, the first resin film 21 is a mirror film in which the reflective layer 21b is laminated on the front film layer 21a, and the second resin film 23 is made of the same material as the front film layer 21a (that is, the second resin film 23 is not a mirror film). However, since good results regarding warping were obtained in Examples 1, 2, 4, and 5 compared to Examples 3 and 6, by using the same material (mirror film) for the first resin film 21 and the second resin film 23, the stresses acting in the vertical direction of the base material 22 become equal, and there is a possibility that warping can also be reduced.

[0105] Here, generally, cosmetic powder 30 denatures when it reaches a temperature of 55°C. Therefore, as a specification requirement of the resin mirror 20, it is required that no warping or swelling occurs at 50°C, which is the upper limit temperature at which it can be used as a cosmetic tool 1, and at a humidity of 90%, which is the upper limit.

[0106] The resin mirror 20 of this embodiment is used for the cosmetic tool 1 filled with the cosmetic powder 30. Regarding warpage, in Examples 1 to 6 (where the first resin film 21 and the second resin film 23 are adhered to the base material 22), good results were obtained at 50°C and 90% humidity compared to Comparative Examples 1 to 5 (where only the first resin film 21 is adhered to the base material 22 or only the base material 22). Therefore, it was found that by using the resin mirror 20 for the cosmetic tool 1, the specification requirements of the cosmetic tool 1 can be satisfied.

[0107] Further, even when the resin mirror 20 of this embodiment uses a highly water-absorbent A-PET resin as the base material 22, under the condition of high humidity of 90% humidity, by adhering the first resin film 21 and the second resin film 23 to the base material 22, it can be confirmed that the occurrence of warpage can be reduced compared to Comparative Examples 1 to 5.

[0108] (Thickness and Material Comparison Experiment) Next, a thickness and material comparison experiment was conducted to evaluate the heat resistance and moisture resistance of the resin mirror 20 when the thicknesses of the first resin film 21, the base material 22, and the second resin film 23 were changed respectively, and when the materials of the first resin film 21, the base material 22, and the second resin film 23 were changed respectively. Therefore, this experiment will be described.

[0109] Figure 10 is a table showing the evaluation results of the warpage after heating in Examples 1 to 5 and Comparative Examples 1 to 7 in the thickness and material comparison experiment.

[0110] As the initial conditions of the thickness and material comparison experiment, the temperature of the constant temperature and humidity chamber was set to 50°C and the humidity was set to 90%. The period for placing the samples shown in Examples 1 to 5 and Comparative Examples 1 to 7 in this constant temperature and humidity chamber was set to 10 days. Also, the size of each sample was set to 52 mm × 59 mm.

[0111] Also, as the judgment criteria, if the warpage is less than 0.5 mm, the evaluation is "○", and if the warpage is 0.5 mm or more, the evaluation is "×".

[0112] In Example 1, the thickness of the base material 22 was 1.5 mm, the thickness of the first resin film 21 was 50 μm, and the thickness of the second resin film 23 was 50 μm. Also, the material of the base material 22 was G-PET (Glycol-modified-PET), the material of the first resin film 21 was mirror PET (mirror film), and the material of the second resin film 22 was PET (polyethylene terephthalate). In the table of FIG. 11, "mirror PET" is a mirror film formed by vapor-depositing aluminum on one side of a PET resin film.

[0113] The evaluation result of Example 1 had a warp of 0.2 mm, and the evaluation was "○".

[0114] In Example 2, the thickness of the base material 22 was 1.5 mm, the thickness of the first resin film 21 was 40 μm, and the thickness of the second resin film 23 was 40 μm. Also, the material of the base material 22 was G-PET, the material of the first resin film 21 was OPP (Oriented Polypropylene), and the material of the second resin film 22 was OPP.

[0115] The evaluation result of Example 2 had a warp of 0.2 mm or less, and the evaluation was "○".

[0116] In Example 3, the thickness of the base material 22 was 1.5 mm, the thickness of the first resin film 21 was 50 μm, and the thickness of the second resin film 23 was 50 μm. Also, the material of the base material 22 was G-PET, the material of the first resin film 21 was PVC (Poly vinyl chloride), and the material of the second resin film 22 was PVC.

[0117] The evaluation result of Example 3 had a warp of 0.2 mm or less, and the evaluation was "○".

[0118] In Example 4, the thickness of the base material 22 was 3.0 mm, the thickness of the first resin film 21 was 50 μm, and the thickness of the second resin film 23 was 50 μm. Also, the material of the base material 22 was G-PET, the material of the first resin film 21 was mirror PET, and the material of the second resin film 22 was PET.

[0119] The evaluation result of Example 4 showed that the warp was 0.2 mm or less, and the evaluation was "○".

[0120] In Example 5, the thickness of the base material 22 was 3.0 mm, the thickness of the first resin film 21 was 100 μm, and the thickness of the second resin film 23 was 100 μm. Also, the material of the base material 22 was G-PET, the material of the first resin film 21 was PET, and the material of the second resin film 22 was PET.

[0121] The evaluation result of Example 5 showed that the warp was 0 mm and no warp occurred, so the evaluation was "○".

[0122] In Comparative Example 1, the thickness of the base material 22 was 1.5 mm, the thickness of the first resin film 21 was 50 μm, and the thickness of the second resin film 23 was 100 μm. Also, the material of the base material 22 was G-PET, the material of the first resin film 21 was mirror PET, and the material of the second resin film 22 was PET.

[0123] The evaluation result of Comparative Example 1 showed that the warp was 0.5 mm, which exceeded 0.2 mm, so the evaluation was "×".

[0124] In Comparative Example 2, the thickness of the base material 22 was 1.5 mm, the thickness of the first resin film 21 was 50 μm, and the thickness of the second resin film 23 was 25 μm. Also, the material of the base material 22 was G-PET, the material of the first resin film 21 was mirror PET, and the material of the second resin film 22 was PET.

[0125] The evaluation result of Comparative Example 2 showed that the warp was 0.5 mm, which exceeded 0.2 mm, so the evaluation was "×".

[0126] In Comparative Example 3, the thickness of the base material 22 was 1.5 mm, the thickness of the first resin film 21 was 50 μm, and the thickness of the second resin film 23 was 50 μm. Also, the material of the base material 22 was G-PET, the material of the first resin film 21 was mirror PET, and the material of the second resin film 22 was OPP.

[0127] The evaluation result of Comparative Example 3 had a warp of 0.5 mm, which exceeded 0.2 mm, so the evaluation was "×".

[0128] In Comparative Example 4, the thickness of the base material 22 was 1.5 mm, the thickness of the first resin film 21 was 50 μm, and the thickness of the second resin film 23 was 50 μm. Also, the material of the base material 22 was G-PET, the material of the first resin film 21 was mirror PET, and the material of the second resin film 22 was PVC.

[0129] The evaluation result of Comparative Example 4 had a warp of 0.5 mm, which exceeded 0.2 mm, so the evaluation was "×".

[0130] In Comparative Example 5, the thickness of the base material 22 was 1.5 mm, the thickness of the first resin film 21 was 50 μm, and the second resin film 23 was not used. Also, the material of the base material 22 was G-PET, and the material of the first resin film 21 was mirror PET.

[0131] The evaluation result of Comparative Example 5 had a warp of 1.0 mm, which exceeded 0.2 mm, so the evaluation was "×".

[0132] In Comparative Example 6, the thickness of the base material 22 was 2.0 mm, the thickness of the first resin film 21 was 50 μm, and the second resin film 23 was not used. Also, the material of the base material 22 was A-PET (Amorphous-PET), and the material of the first resin film 21 was mirror PET.

[0133] The evaluation result of Comparative Example 6 had a warp of 0.5 mm, which exceeded 0.2 mm, so the evaluation was "×".

[0134] In Comparative Example 7, the thickness of the base material 22 was 3.0 mm, the thickness of the first resin film 21 was 50 μm, and the second resin film 23 was not used. Also, the material of the base material 22 was G-PET, and the material of the first resin film 21 was mirror PET.

[0135] The evaluation result of Comparative Example 7 had a warp of 0.2 mm or less, and the evaluation was "○".

[0136] In Examples 1 to 5, the materials and thicknesses of the first resin film 21 and the second resin film 23 are the same. Since the warp after heating in any of Examples 1 to 5 was 0.2 or less, the evaluation was "○".

[0137] Thus, by making the materials and thicknesses of the first resin film 21 and the second resin film 23 the same, the stresses generated in the first resin film 21 and the second resin film 23 become the same. Therefore, even when heat is applied to the resin lens 20, it is considered that the one-sided warping deformation in the vertical direction can be suppressed by the uniform stress in the vertical direction by the first resin film 21 and the second resin film 23.

[0138] Also, the ratio of the first resin film 21 or the second resin film 23 to the thickness of the base material 22 was 0.033 in Comparative Examples 1, 4, and 6, 0.026 in Comparative Example 2, and 0.017 in Comparative Example 5. That is, if the materials and thicknesses of the first resin film 21 and the second resin film 23 are the same, when the ratio of the first resin film 21 or the second resin film 23 to the thickness of the base material 22 is within the range of 0.017 to 0.033, the warp in all cases was 0.2 mm or less, so the evaluation was "○".

[0139] On the other hand, in Comparative Examples 1 and 2, the materials of the first resin film 21 and the second resin film 23 are the same, but the thicknesses are different. Also, in Comparative Examples 3 and 4, the thicknesses of the first resin film 21 and the second resin film 23 are the same, but the materials are different. In this case, a warp of 0.5 mm occurred in any of Comparative Examples 1 to 4, so the evaluation was "×".

[0140] This is because the stress of the first resin film 21 generated on the surface of the base material 22 and the stress of the second resin film 23 generated on the back surface of the base material 22 are different due to the difference in material or thickness between the first resin film 21 and the second resin film 23, and the stresses acting on the front and back of the base material 22 become non-uniform, so it is considered that warping occurred in the direction of the greater stress.

[0141] In Comparative Examples 5 to 7, without using the second resin film 23, the first resin film 21 was attached to the surface of the base material 22, and the evaluation was performed by changing the thickness of the base material 22.

[0142] As a result, the warp decreased as the thickness of the base material 22 increased. In Comparative Example 7, since the warp was 0.2 mm or less, the evaluation was "○".

[0143] This is presumably because as the thickness of the base material 22 increases, the rigidity of the base material 22 increases, and deformation due to residual stress is suppressed.

[0144] That is, it can be confirmed that the resin mirror 20 of the present embodiment compensates for the rigidity of the base material 22 by adhering the first resin film 21 and the second resin film 23 at a relatively low rigidity of the base material 22 of 1.5 mm to 3.0 mm, and significantly exhibits the effect of reducing warpage while obtaining the effects of reducing material costs and miniaturization.

[0145] More specifically, in the case where the first resin film 21 is adhered only to one side of the base material 22 (Comparative Examples 5 and 6), or in the case where the first resin film 21 and the second resin film 23 having different thicknesses are adhered to the front and back surfaces of the base material 22 (Comparative Examples 1 to 4), the base material 22 warped due to heat. However, by adhering the first resin film 21 and the second resin film 23 having the same thickness to the base material 22 as in the invention of the present embodiment (Examples 1 to 6), it can be confirmed that the base material 22 is prevented from warping under heat resistance and humidity resistance when used as the cosmetic tool 1.

[0146] Further, for the resin mirror 20 of the present embodiment, even when a PET resin with high water absorption is used for the base material 22, the first resin film 21, and the second resin film 23, by adhering the first resin film 21 and the second resin film 23 of the same thickness to the base material 22, the risk of warping of the resin mirror 20 can be reduced even under a high humidity of 90%. Thereby, since the first resin film 21 and the second resin film 23 can be manufactured from a relatively inexpensive PET resin for the base material 22, the manufacturing cost of the resin mirror 20 can be reduced.

[0147] (Second Embodiment) Hereinafter, with reference to the drawings, the cosmetic tool 1' according to the second embodiment of the present invention will be described.

[0148] FIG. 11 is a schematic perspective view of a state in which a cosmetic tool with a resin mirror according to the second embodiment of the present invention is opened, and FIG. 12 is a schematic cross-sectional view taken along line B-B of FIG. 12.

[0149] Furthermore, in FIG. 12, although the front film layer 21a' is shown to be thicker than the back film layer 23a, these are for convenience of explanation, and as will be described later, the front film layer 21a' and the back film layer 23a shall have the same thickness.

[0150] As shown in FIG. 11, the cosmetic tool 1' includes a cosmetic tool body 10 formed to be foldable, a resin mirror 20' attached to the lid 11 of the cosmetic tool body 10, and a cosmetic powder 30 attached to the cosmetic container 12 of the cosmetic tool body 10, similar to the cosmetic tool 1 of the first embodiment.

[0151] The cosmetic tool body 10 and the cosmetic powder 30 have the same structure as the cosmetic tool body 10 and the cosmetic powder 30 of the cosmetic tool 1 described in the first embodiment, so the same reference numerals are given, and detailed description thereof is omitted.

[0152] As shown in Fig. 12, the resin lens 20' includes a transparent plate-shaped base material 22', a first resin film 21' adhered so as to cover the upper side of the base material 22' in the Z-axis direction, and a second resin film 23' adhered so as to cover the lower side of the base material 22' in the Z-axis direction.

[0153] The base material 22' is made of resin such as transparent PET resin, and its thickness is set to 1.5 mm. Since other configurations are the same as those of the base material 22 in the first embodiment, the description here is omitted.

[0154] As shown in Fig. 12, the first resin film 21' has a front-side film layer 21a' adhered to the upper side of the base material 22' and a protective layer 21b' (hard coat) applied so as to cover the front side (upper side in the Z-axis direction) of the front-side film layer 21a'. The ratio of the thickness of the first resin film 21' to the thickness of the base material 22' (thickness of the first resin film 21' / thickness of the base material 22') is preferably 0.017 to 0.033. In this embodiment, the thickness of the first resin film 21' is 50 μm, that is, the ratio of the thickness of the first resin film 21' to the thickness of the base material 22' (thickness of the first resin film 21' / thickness of the base material 22') is set to about 0.033. The first resin film 21' is adhered to the surface of the base material 22' by an adhesive (such as Air Coupe Neo) with outgassing countermeasures.

[0155] The second resin film 23' has a resin back-side film layer 23a, a reflective layer 23b' vapor-deposited on the upper side (side facing the base material 22') of the back-side film layer 23a in the Z-axis direction, a hard coat layer 23c' applied so as to cover the lower side (side opposite to the side facing the base material 22') of the back-side film layer 23a in the Z-axis direction, and a protective layer 23d' (hard coat) applied so as to cover the upper side (side facing the base material 22') of the reflective layer 23b' in the Z-axis direction. For example, a mirror film is used as the second resin film 23'. The thickness of the second resin film 23' is preferably set to be substantially the same as the thickness of the first resin film 21'.

[0156] Unlike the hard coat layer 21c of the first embodiment, the hard coat layer 23c' of this embodiment is applied to the back side (lower side in the Z-axis direction) of the back film layer 23a.

[0157] More specifically, in the first embodiment, the first resin film 21 having the reflective layer 21b was positioned in the order of the hard coat layer 21c, the front film layer 21a, the reflective layer 21b, and the protective layer 21d from the front side (upper side in the Z-axis direction). However, in this embodiment, the second resin film 23' having the reflective layer 23b' is in the reverse order, and is positioned in the order of the protective layer 23d', the reflective layer 23b', the back film layer 23a, and the hard coat layer 23c' from the front side.

[0158] Regarding the back film layer 23a, the reflective layer 23b', the hard coat layer 23c', and the protective layer 23d', since the same ones as the front film layer 21a, the reflective layer 21b, the hard coat layer 21c, and the protective layer 21d of the first embodiment are used respectively, detailed description is omitted.

[0159] (Effect) According to the resin mirror 20' of such a second embodiment, since the second resin film layer 23' having the reflective layer 23b' is on the back side of the base material 22', the base material 22' and the first resin film 21' can more effectively protect the mirror surface, and the warping of the resin mirror 20' due to temperature change caused by the adhesion of the first resin film 21' and the second resin film 23' to the base material 22' can be suppressed.

[0160] (Other Embodiments) In the above first embodiment, the resin mirror 20 was described as an element constituting the cosmetic tool 1 attached to the cosmetic tool body 10. However, the use of the resin mirror 20 is not limited to the cosmetic tool 1, and it may be used, for example, as a mirror used inside a vehicle. If the resin mirror 20 is used as a mirror inside the vehicle in this way, for example, even when the temperature inside the vehicle is 50°C and the humidity is 90%, the risk of the mirror deforming can be reduced.

[0161] In the above first embodiment, the reflective layer 21b was formed by vapor-depositing a metal such as aluminum on the surface (the surface on the lower side in the Z-axis direction) of the base material 22 of the film layer 21a. However, the method of forming the reflective layer 21b is not limited to aluminum vapor deposition, and any material mainly composed of a metal may be used. For example, the reflective layer 21b may be formed by a silver mirror reaction or the like, or the reflective layer 21b may be formed by adhering or laminating a thin metal film.

[0162] In the above first embodiment, a PET resin was used as the material for the first resin film 21 and the second resin film 23. However, the materials for the first resin film 21 and the second resin film 23 are not limited to PET resin as long as they are the same. For example, OPP or PVC materials can also be used.

[0163] Also, in the above first embodiment, the materials of the first resin film 21 and the second resin film 23 were described as being the same. However, the materials of the first resin film 21 and the second resin film 23 only need to be materials with the same characteristics. For example, when there are multiple types among PET resins such as A-PET (Amorphous-PET), C-PET (Crystallized-PET), and G-PET (Glycol-modified-PET), materials with the same characteristics can be appropriately selected from among them.

[0164] In the above first embodiment, the first resin film 21 formed on the front side of the reflective layer 21b was described as being transparent. However, it is not particularly limited to this, and any material that can transmit the object on the front side of the first resin film 21 may be used. For example, colored materials or materials with a translucent pattern may be used.

[0165] Similarly, in the above second embodiment, the base material 22 and the first resin film 21 formed on the front side of the reflective layer 21b were described as being transparent. However, it is not particularly limited to this, and any material that can transmit the base material 22 and the first resin film 21 may be used. For example, colored materials or materials with a translucent pattern may be used.

[0166] In the above-described first embodiment, the reflective layer 21b is vapor-deposited on the back side of the front-side film layer 21a. However, the position where the reflective layer 21b is formed is not limited to the back side of the front-side film layer 21a. As long as it can reflect the light from the front side of the resin lens 20, it may be vapor-deposited on the front side of the second resin film 23 (the surface on the base material 22 side in the second resin film 23). Thereby, peeling and damage of the reflective layer 21b can be effectively suppressed by the base material 22 and the film layer 21a.

[0167] In the above-described first embodiment, the hard coat layer 21c is formed by applying a hard coat agent that cures by UV curing or any other method on the surface of the front-side film layer 21a. However, the method of forming the hard coat layer 21c is not limited to the application of the hard coat agent. For example, the hard coat layer 21c may be formed by adhering or laminating a thin protective film having scratch prevention and stain prevention performance.

[0168] In the above-described first embodiment, the protective layer 21d is formed by applying a protective agent that cures by UV curing or any other method on the reflective layer 21b. However, the method of forming the protective layer 21d is not limited to the application of the protective agent. For example, the protective layer 21d may be formed by adhering or laminating a thin protective film having scratch prevention and stain prevention performance.

[0169] In the above-described first and second embodiments, the first resin films 21, 21' and the second resin films 23, 23' have been described as having the same thickness and material. However, the first resin films 21, 21' and the second resin films 23, 23' do not necessarily have the same thickness and material, as long as the thickness and material are set so that the rigidity is the same.

[0170] Specifically, even if the first resin films 21, 21' are thinner than the second resin films 23, 23', the material of the first resin films 21, 21' is set to be a material having a higher rigidity than the rigidity of the material of the second resin films 23, 23', and the materials and thicknesses are set so that the rigidity of the first resin films 21, 21' is the same as the rigidity of the second resin films 23, 23'.

[0171] In the above embodiment, the resin mirror 20 has been described as being formed in a horizontally long substantially rectangular shape. However, the shape of the resin mirror 20 is not limited to this, and for example, it may be formed in other shapes such as a circular shape or a square shape.

[0172] By appropriately changing the shape of the resin mirror 20 in this way, aesthetic properties can be imparted to the shape of the resin mirror 20 in the cosmetic tool 1.

[0173] In the above embodiment, after the second resin film 23 is adhered to the back side of the base material 22, the first resin film 21 having the reflective layer 21b is adhered to the front side of the base material 22. However, the order of adhering the first resin film 21 and the second resin film 23 to the base material 22 may be reversed. That is, after the first resin film 21 having the reflective layer 21b is adhered to the front side of the base material 22, the second resin film 23 may be adhered to the back side of the base material 22.

[0174] By adhering the second resin film 23 to the back side of the base material 22 after adhering the first resin film 21 having the reflective layer 21b to the front side of the base material 22, the second resin film 23 can be adhered to the back side of the base material 22 in a state where the surface of the base material 22 is flattened by the rigidity of the first resin film 21 having the reflective layer 21b. Therefore, compared with the case where the first resin film 21 is adhered to the front side of the base material 22 after the second resin film 23 having relatively low rigidity is adhered to the back side of the base material 22, warping of the resin mirror 20 can be more effectively suppressed.

[0175] In the above embodiment, an adhesive that suppresses the generation of air bubbles between the base material 22 and the first resin film 21 is used. However, the adhesives that can be used are not limited to those that suppress the generation of air bubbles in this way, and an adhesive having a function of discharging the air bubbles generated between the base material 22 and the first resin film 21 to the outside may be used.

[0176] In the above embodiment, the first resin film 21 is a mirror film obtained by vapor-depositing a reflective layer 21b on the front film layer 21a, and the second resin film 23 is made of the same material as the front film layer 21a (that is, the second resin film 23 is not a mirror film). However, the second resin film 23 may also be a mirror film.

[0177] By making the first resin film 21 and the second resin film 23 of the same material (mirror film), the stresses acting in the vertical direction of the base material 22 become equal, and the effect of further suppressing warping is obtained.

[0178] The lid body 11 to which the resin mirror 20 is attached as the cosmetic tool body 10 of the cosmetic tool 1 of the present embodiment has been described as being rotatably attached to the cosmetic container 12 filled with the cosmetic powder 30. However, the configuration of the cosmetic tool body 10 is not particularly limited to this, and as long as it includes the cosmetic powder 30 applied to the user's face or the like, the resin mirror 20, and the cosmetic tool body 10 filled with the cosmetic powder 30 and to which the resin mirror 20 is attached, any other configuration may be used. For example, as the configuration of the cosmetic tool body 10, the resin mirror 20 and the cosmetic powder 30 may be arranged side by side vertically or horizontally on the same surface of the cosmetic container 12.

[0179] The present invention can be implemented in various other forms without departing from its spirit or main features. Therefore, the above-described embodiments are merely illustrative in all respects and should not be construed in a limiting sense. The scope of the present invention is indicated by the claims and is not restricted by the description in the specification. Furthermore, all modifications, various improvements, alternatives, and modifications belonging to the equivalent scope of the claims are all within the scope of the present invention.

Explanation of Reference Numerals

[0180] 1, 1’: Cosmetic tool 10: Cosmetic tool body 11: Lid body 11a: Mirror attachment portion 12: Cosmetic container 12a: Powder attachment portion 20, 20’: Resin lens 21, 21’: First resin film 21a, 21a’: Front film layer 21b, 23b’: Reflective layer 21c, 23c’: Hard coat layer 21d, 21b’, 23d’: Protective layer 22, 22’: Substrate 23, 23’: Second resin film 23a: Back film layer 30: Cosmetic powder

Claims

1. A resin mirror comprising a plate-shaped base material made of resin, a first resin film that is thinner than the base material and laminated so as to cover the front side of the base material and has a resin front-side film layer, and a second resin film that is thinner than the base material and laminated so as to cover the back side of the base material, wherein the first resin film has a reflective layer formed on the back side surface of the front-side film layer and made mainly of metal, and the reflective layer reflects an object facing the surface of the first resin film through the front-side film layer disposed on the front side of the reflective layer. The resin mirror, wherein the front-side film layer and the second resin film have the same thickness and material.

2. A resin mirror comprising a plate-shaped base material made of resin, a first resin film that is thinner than the base material and laminated so as to cover the front side of the base material and has a resin front-side film layer disposed on the front side of the base material, and a second resin film that is thinner than the base material and laminated so as to cover the back side of the base material and has a resin back-side film layer, wherein the second resin film has a reflective layer formed on the front side surface of the back-side film layer and made mainly of metal, and the reflective layer reflects an object facing the surface of the first resin film through the first resin film and the base material disposed on the front side of the reflective layer. The resin mirror, wherein the front-side film layer and the back-side film layer have the same thickness and material.

3. A cosmetic tool comprising cosmetic powder to be applied to a user's face or the like, the resin mirror according to claim 1 or 2, and a cosmetic tool body filled with the cosmetic powder and attached with the resin mirror. The cosmetic tool, wherein the thickness of the base material is 1.5 mm or more and less than 3.0 mm.

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