Resin molded article with coating film, method for manufacturing the same, and optical apparatus

Abstract

The present application provides a resin molded product with a coating film and a method for manufacturing the same, and an optical device. The resin molded product with a coating film, when used for an optical device, has high decorative quality, can perform high-precision light display, and on the other hand, has a shielding property that cannot see a symbol or the like except when in use. The resin molded product with a coating film includes a primary resin molded member having a through hole, and a light-transmissive coating film covering one end surface of the through hole of the primary resin molded member and a surface of the primary resin molded member around the one end surface of the through hole.

Description

Technical Field

[0001] This invention relates to resin molded articles with coating film, methods for manufacturing the same, and optical devices using the resin molded articles with coating film. Background Technology

[0002] In recent years, decorative components for interfaces such as displays and switches have become increasingly popular. These components, when the lighting or display is off, feature high-quality finishes, such as wood-like textures, and various design combinations that provide a tactile experience. Furthermore, there is a demand for decorative components that can display high-precision light when the lighting or display located on the back of the component is turned on. Additionally, when the lighting or display is not in use (off), there is a requirement for components that prevent the visibility of markings or symbols on the back of the component, and for display shielding. Summary of the Invention

[0003] The problem that the invention aims to solve As optical devices such as displays and switches, it is possible to embed a decorative film molded onto the surface or back of a resin molded article. However, when using a decorative film on the surface of a resin molded article, even if highly fine wrinkles are formed on the protective layer or hard coating of the film surface, these wrinkles are easily damaged during embedding. Furthermore, even methods that transfer wrinkles formed on the mold surface during embedding to the surface of the protective layer or hard coating of the decorative film are difficult to form highly fine wrinkle shapes on the surface of the protective layer or hard coating, which has poor flowability, thus making it difficult to achieve a satisfactory tactile feel.

[0004] On the other hand, when a decorative film is used on the back of the resin molded article, light easily diffuses from the back to the surface, potentially causing display blurring. Furthermore, if mold wrinkles are formed on the surface of the resin molded article, light diffuses even more easily due to the wrinkles, worsening the display blurring. The surface hardness of the resin is also insufficient, making it susceptible to damage. From the perspective of resin flowability, it is difficult to transfer fine, uneven wrinkle shapes with high precision. Additionally, in all the above processing methods, a decorative film is used, thus increasing costs.

[0005] Therefore, the purpose of this disclosure is to provide a resin molded article with a coating film that, when used in optical equipment, has high decorative quality and can perform high-precision light display, and on the other hand, has the property of being opaque enough that symbols and the like cannot be seen through it when in use.

[0006] Methods for solving problems The resin molded article with a coating film disclosed herein comprises: a primary resin molded part having a through hole; and a light-transmitting coating film covering one end face of the through hole of the primary resin molded part and the surface of the primary resin molded part surrounding the one end face of the through hole.

[0007] The optical device disclosed herein comprises: the aforementioned resin molded article with a coating film; a shielding portion that covers the periphery of the other end face of the through hole and forms a dark chamber between the shielding portion and the back face of the resin molded article with the coating film; and a light irradiation portion that irradiates light from the dark chamber formed between the back face of the resin molded article with the coating film and the shielding portion toward the other end face of the through hole.

[0008] The method for manufacturing a resin molded article with a coating film disclosed herein includes: a step of preparing a primary resin molded part having a through hole; and a step of forming a light-transmitting coating film covering one end face of the through hole of the primary resin molded part and the surface of the primary resin molded part surrounding the one end face of the through hole, thereby obtaining a resin molded article with a coating film having a primary resin molded part and a coating film.

[0009] Invention Effects The resin molded article with a coating film according to the present invention has high decorative quality when used in optical equipment, enabling high-precision light display, and also has the property of shielding symbols and the like from being seen through the lens when in use. Attached Figure Description

[0010] Figure 1 This is a schematic cross-sectional view taken from a direction perpendicular to the center of the through hole of the resin molded article with coating film in Embodiment 1.

[0011] Figure 2A This is a schematic cross-sectional view showing the visibility from the surface of the light device in Embodiment 1 with the LEDs disconnected.

[0012] Figure 2B This is a schematic cross-sectional view showing the visibility from the surface of the light device in Embodiment 1 with the LED illumination turned on.

[0013] Figure 3A This is a schematic cross-sectional view showing the process of forming a primary resin molded part with a through hole in the manufacturing method of a resin molded article with a coating film according to Embodiment 1.

[0014] Figure 3B It means in Figure 3A A schematic cross-sectional view of a primary resin-molded component formed between a first core mold and a mold cavity mold for resin molding during the process.

[0015] Figure 3CThis is a schematic plan view showing the case where eight primary resin molded parts are formed simultaneously in the process of forming a primary resin molded part with a through hole.

[0016] Figure 4A This is a schematic cross-sectional view showing the process of forming a resin molded article with a coating film in the manufacturing method of the resin molded article with a coating film according to Embodiment 1.

[0017] Figure 4B It means in Figure 4A A schematic cross-sectional view of a resin molded article with a coating film formed between the second core mold and the coating film mold cavity mold during the process.

[0018] Figure 5A This is a schematic cross-sectional view of a resin molded article with a coated film, as shown in Modified Example 1.

[0019] Figure 5B It means Figure 5A A partial enlarged view of the undercut portion on the back side of part A near the through hole.

[0020] Figure 6A This is a schematic cross-sectional view taken from a direction perpendicular to the center of the through hole of the resin molded article with coating film in Embodiment 2.

[0021] Figure 6B It constitutes Figure 6A An enlarged cross-sectional view of part B near the through hole of a primary resin-molded component of a resin-molded article with a coated film.

[0022] Figure 6C It means in Figure 6B An enlarged cross-sectional view showing a coated film forming near the through hole.

[0023] Figure 7A This is a schematic cross-sectional view of the resin molded article with a coating film in Modified Example 2.

[0024] Figure 7B This is a schematic cross-sectional view of the resin molded article with a coating film in variation 3.

[0025] Figure 7C This is a schematic cross-sectional view of the resin molded article with a coating film in variation 4.

[0026] Figure 8A This is a schematic cross-sectional view showing the situation where the light irradiation unit in the optical device of Embodiment 1 is housed in a dark chamber.

[0027] Figure 8B This is a schematic cross-sectional view showing the light irradiation part of the resin molded article with a coated film in Modified Example 5 as an optical fiber inserted from outside the dark room into the dark room.

[0028] Figure 9A This is a schematic cross-sectional view of the resin molded article with a coating film of variation 6.

[0029] Figure 9B This is a schematic cross-sectional view of the resin molded article with a coated film in variation 7.

[0030] Figure 9C This is a schematic cross-sectional view of the resin molded article with a coating film in variation 8.

[0031] Figure 10 This is a schematic cross-sectional view taken from a direction perpendicular to the center of the through hole of the resin molded article with coating film in Embodiment 3.

[0032] Figure 11A This is a schematic cross-sectional view taken from a direction perpendicular to the center of the through hole of the resin molded article with coating film in Modified Example 9.

[0033] Figure 11B yes Figure 11A An enlarged sectional view of part D.

[0034] Figure 12A This is a schematic cross-sectional view viewed from a direction perpendicular to the center of the through hole of the resin molded article with coating film in Modified Example 10.

[0035] Figure 12B This is a schematic cross-sectional view viewed from a direction perpendicular to the center of the through hole of the resin molded article with coating film in Modified Example 11.

[0036] Figure 13 This is a plan view from above of the resin molded article with a coating film according to Embodiment 4.

[0037] Figure 14A It is along Figure 13 A rough cross-sectional view viewed from the EE direction.

[0038] Figure 14B This is a schematic cross-sectional view of a resin molded article with a coated film, as shown in Modified Example 12.

[0039] Figure 15 This is a plan view from above of the resin molded article with a coating film according to Embodiment 5.

[0040] Figure 16A It is along Figure 15 A rough cross-sectional view viewed from the FF direction.

[0041] Figure 16B This is a schematic cross-sectional view of a resin molded article with a coated film, as shown in Modified Example 13.

[0042] Figure 16C This is a schematic cross-sectional view of a resin molded article with a coated film, as shown in Modified Example 14.

[0043] Figure 16D This is a schematic cross-sectional view of a resin molded article with a coated film, as shown in Modified Example 15.

[0044] Figure 16E This is a schematic cross-sectional view of a resin molded article with a coated film, as shown in Modified Example 16.

[0045] Figure 16F This is a schematic cross-sectional view of a resin molded article with a coated film, as shown in Modified Example 17.

[0046] Figure 17 This is a plan view of the upper surface of the resin molded article with a coating film in Modified Example 13.

[0047] Figure 18A This is a schematic cross-sectional view of a resin molded article with a coated film, as shown in Modified Example 13.

[0048] Figure 18B This is a schematic cross-sectional view of a resin molded article with a coated film, as shown in Modified Example 18.

[0049] Figure 19 It means Figure 17 A partial plan view of the central island section, the surrounding through holes, and the lower bridging section with bottom holes.

[0050] Figure 20A Is Figure 19 A schematic cross-sectional view of the H section, observed in the GG direction, showing the coating film filling the through holes and the lower bridging section with bottom holes.

[0051] Figure 20B This is a schematic cross-sectional view of the H portion of the bridging portion of the resin molded article with coating film of modified example 19, which includes a coating film filled with through holes and a bottom hole.

[0052] Figure 20C This is a schematic cross-sectional view of the H portion of the resin molded article with coating film of modified example 20, which includes a coating film filled with through holes and a lower bridging portion with bottom holes.

[0053] Figure 21A This is a plan view from above of the resin molded article with a coated film of Modified Example 21.

[0054] Figure 21B This is a plan view from above of the resin molded article with a coated film of Modified Example 22.

[0055] Symbol Explanation 2. Symbol (C) 4. Symbol (O) 6. Symbol (triangle) 10 One-time resin molded parts 12 Through Holes 14 Surface 16. Back 17 Inner edge 18, 18a, 18b Outer edge 19 protuberance 22 folds 24. Uneven parts 30 Coating film 32. Undercut 34 gaps 36 Hook and Hanging Part 38 has a bottom hole 40 Conical section 42. Island 44 Bridging section 50, 50a, 50b, 50c, 50d, 50e, 50f, 50g, 50h, 50i, 50j, 50k, 50l, 50m, 50n, 50o, 50p, 50q, 50r, 50s, 50t, 50u, 50v, 50w - Resin molded products with coated films. 52 Base plate (shielding part) 54 Dark Room 60 LED (light irradiation part) 60A optical fiber (light irradiation section) 62 Light 70 Resin molding mold 72 First Core Mold 74 Molds for resin molded products 76 Mold cavities for resin molded articles 77 recess 78 Injection Resin Gate 79. Runner gate 80 Coating film mold 82 Second Core Mold 84. Mold for coating film 86. Mold cavity for coating film 88 Paint Injection Head 100, 100a optical equipment Detailed Implementation

[0056] The first type of resin molded article with a coating film comprises: a primary resin molded part having a through hole; and a light-transmitting coating film covering one end face of the through hole of the primary resin molded part and the surface of the primary resin molded part surrounding the one end face of the through hole.

[0057] In the second method, the coated resin molded article can fill a portion of the through-hole in the first method described above.

[0058] In the third method, the coated resin molded article is in the same way as the first method described above, where the coated film can cover a portion of the inner wall of the through hole from one end face of the through hole.

[0059] In the fourth method, the coated resin molded article is in the first method described above, where the coated film can fill from one end face of the through hole to the other end face.

[0060] In the fifth embodiment, the coated resin molded article is in the same manner as the fourth embodiment described above, where the coated film may have an undercut portion extending from the periphery of the other end face of the through hole into the back side of the primary resin molded part.

[0061] In the sixth method, the through hole in the coated resin molded article in the first method described above can be formed by a gap from one end face to the other.

[0062] In the seventh method, the coated resin molded article may contain fillers, pigments or dyes in any of the first to sixth methods mentioned above.

[0063] The resin molded article with coating film involved in the eighth method may also be, in any of the first to seventh methods described above, the wall thickness of the inner edge portion constituting the through hole of the primary resin molded component is thinner than the wall thickness of the outer edge portion located outside the radial direction of the through hole.

[0064] Based on any of the first to eighth embodiments, the resin molded article with coating film in the ninth embodiment may also have a wall thickness variation section in which the wall thickness increases from the inside to the outside in the radial direction of the through hole.

[0065] In any of the first to ninth embodiments of the tenth embodiment, the through hole has an uneven shape, a wrinkled shape or a conical shape on its inner side, and the primary resin and the coating film can be joined by interlocking of the uneven shape, the wrinkled shape or the conical shape.

[0066] In the eleventh embodiment, the coated resin molded article may have an uneven or wrinkled surface in any of the first to tenth embodiments described above.

[0067] In the twelfth method, the resin molded article with a coating film can be a cured coating material in any of the first to eleventh methods described above.

[0068] In any of the first to twelfth embodiments, the coating film of the resin molded article with coating film involved in the thirteenth embodiment may have: an inset portion that extends from one end face of the through hole on the surface of the primary resin molded part and insets from the end of the surface to the back side of the primary resin molded part.

[0069] The optical device of the fourteenth type comprises: a resin molded article with a coating film of any one of the first to thirteenth types described above; a shielding portion that covers the periphery of the other end face of the through hole and forms a dark chamber between the shielding portion and the back face of the resin molded article with the coating film; and a light irradiation portion that irradiates light from the dark chamber formed between the back face of the resin molded article with the coating film and the shielding portion toward the other end face of the through hole.

[0070] The fifteenth method for manufacturing a resin molded article with a coating film includes: a step of preparing a primary resin molded part having a through hole; and a step of forming a light-transmitting coating film covering one end face of the through hole of the primary resin molded part and the surface of the primary resin molded part surrounding the one end face of the through hole, thereby obtaining a resin molded article with a coating film having a primary resin molded part and a coating film.

[0071] The method for manufacturing a resin molded article with a coating film according to the sixteenth embodiment may also include, in the fifteenth embodiment, the process of preparing a primary resin molded component with a through hole, comprising: a first mold closing process, in which a first core mold for a resin molded article mold and a cavity mold for a resin molded article are closed together to define a cavity for a resin molded article corresponding to the primary resin molded component with a through hole; a resin introduction process, in which primary resin is introduced into the cavity for a resin molded article to form a primary resin molded component with a through hole; and a mold opening process, in which the first core mold and the cavity mold for a resin molded article are opened to obtain a primary resin molded component with a through hole.

[0072] The method for manufacturing a resin molded article with a coating film in the seventeenth method is as follows: In the fifteenth method described above, the step of preparing a primary resin molded part with a through hole can be a step of cutting a primary resin material that has been molded into an arbitrary shape to obtain a primary resin molded part with a through hole.

[0073] The method for manufacturing a resin molded article with a coating film in the eighteenth method is as follows: In the fifteenth method described above, the process of preparing a primary resin molded part with a through hole can be a process of forming a primary resin molded part by using a 3D printer.

[0074] The nineteenth method of manufacturing a resin molded article with a coating film, in any of the fifteenth to eighteenth methods described above, may include the following steps in forming a translucent coating film: a second mold-closing step, in which a primary resin molding component having a through hole is placed on a second core mold, the second core mold is closed with a coating film cavity mold, and a coating film cavity including the one end face of the through hole is defined; a coating filling step, in which a translucent coating is filled into the coating film cavity, and a coating film is formed by the coating covering the one end face of the through hole and the surface of the primary resin molding component surrounding the one end face of the through hole; and a demolding step, in which the second core mold and the coating film cavity mold are opened, and a resin molded article with a coating film is extruded from the inside of the second core mold, thereby obtaining a resin molded article with a coating film.

[0075] The twentieth method relates to a method for manufacturing a resin molded article with a coating film. In the nineteenth method described above, during the coating filling process, a coating film containing through holes filled with coating film can be formed.

[0076] The manufacturing method of the resin molded article with coating film in the twenty-first method can also be that, in the nineteenth method above, the second core mold has a recess for introducing paint on the back side of the primary resin molding component facing the through hole of the primary resin molding component. In the paint filling process, paint is introduced from the surface of the mold cavity facing the coating film through hole to the back side, forming an infeed portion that extends from one end face of the through hole on the surface of the primary resin molding component and wraps around the back side of the primary resin molding component from the end of the surface.

[0077] Hereinafter, the resin molded article with coating film of the present disclosure, the method for manufacturing the same, and the optical device will be described with reference to the accompanying drawings.

[0078] (Implementation Method 1) Figure 1 This is a schematic cross-sectional view taken from a direction perpendicular to the center of the through hole 12 of the resin molded article 50 with coating film in Embodiment 1. Figure 2A This is a schematic cross-sectional view showing the visibility from the surface of the light device 100 of Embodiment 1 with the LED 60 disconnected. Figure 2B This is a schematic cross-sectional view showing the visibility from the surface of the light device 100 of Embodiment 1 with the LED 60 turned on.

[0079] <Resin molded products with coating> like Figure 1As shown, the resin molded article 50 with a coated film according to Embodiment 1 includes: a primary resin molded part 10 having a through hole 12; and a light-transmitting coated film 30 filling the through hole 12. The coated film 30 covers one end face of the through hole 12 and the surface 14 of the primary resin molded part 10 surrounding the one end face of the through hole 12. It should be noted that, for example, even for micro-sized through holes with a pore diameter d of 0.05 mm (50 μm) to 0.2 mm (200 μm), as described later, the coated film 30 is formed using a low-viscosity paint, thus it can be filled, enabling high-precision display using micro-sized through holes. In addition, the coated film 30 can be as thin as approximately 0.05 mm to 1 mm, and wrinkles can also be provided, thus resulting in high decorative quality.

[0080] The following describes the constituent elements of the resin molded article 50 with the coating film.

[0081] <One-piece resin molded parts> The primary resin molded part 10 is formed by injection molding a primary resin. Any commonly used injection-moldable resin can be used as the primary resin, with thermoplastic resins being particularly preferred. Examples of thermoplastic resins include polyethylene, polypropylene, polyamide, ABS resin, polyvinyl chloride, polystyrene, polyvinyl acetate, polyurethane, acrylic resin, polycarbonate, and polyester, but other resins not listed herein may also be used. It should be noted that thermosetting resins have a cross-linked structure, resulting in a stable molecular structure on the surface of the molded article, which can lead to difficulties in the adhesion of in-mold coatings. However, even with thermosetting resins, there are no problems as long as sufficient adhesion to the coating can be ensured.

[0082] Alternatively, the one-piece resin molded part 10 can also be colored black to prevent light transmission. Therefore, in the case of use in optical devices, a darkroom can be formed on the back side.

[0083] <Through Hole> In addition, the primary resin molding component 10 has a through hole 12. The through hole 12 in the primary resin molding component 10 preferably has a diameter d of 0.05 mm (50 μm) or more and 5 mm or less.

[0084] Furthermore, the upper limit of the diameter of the through hole 12 is illustrative and is not limited to the above range. For example, if a through hole of 5 mm or more is required for the application, it is not a problem to form a through hole 12 that exceeds the above range.

[0085] Furthermore, the through hole 12 is not limited to the case where the cross-sectional shape is continuous along the same thickness direction between one end face and the other end face; the cross-sectional shape can also vary between the two ends. Additionally, as described later, the through hole can also have an uneven shape on its inner surface. Figure 9B ), pleated shape or cone shape ( Figure 9A , Figure 9C Thus, the primary resin and the coating film are joined together through interlocking of concave, pleated, or conical shapes.

[0086] like Figure 1 As shown, the wall thickness of the inner edge portion 17 of the primary resin molding component 10, for example, constituting the through hole 12, can be thinner than the wall thickness of the outer edge portion 18 located radially outward of the inner edge portion 17 relative to the through hole 12. By making the wall thickness of the inner edge portion 17 thinner than that of the outer edge portion 18, the length of the through hole 12 can be shortened, and the attenuation of light passing through the through hole 12 can be suppressed. In addition, during the formation stage of the primary resin molding component 10, by thinning the wall thickness of the inner edge portion 17, the generation of deformation caused by shrinkage marks of the primary resin around the through hole 12 can be suppressed.

[0087] <Coating Film> The coating film 30 is formed by curing a translucent coating. The translucent coating can be, for example, a two-component thermosetting polyurethane coating, a two-component thermosetting epoxy coating, a one-component thermosetting acrylic coating, or a UV-curing coating. The coating film 30 may contain additives such as fillers, colorants, curing accelerators, and release agents. The fillers mentioned above can be, for example, glossy metallic fillers or optical interference pigments such as highly translucent polarizing pearls.

[0088] The coating film 30 fills the through hole 12 of the primary resin molding component 10. Furthermore, the coating film 30 covers one end face of the through hole 12 and the surface 14 of the primary resin molding component 10 surrounding the one end face of the through hole 12. The thickness t of the coating film 30 covering the surface 14 of the primary resin molding component 10 is, for example, 0.05 mm or more and 1 mm or less. Furthermore, the thickness t can be, for example, 0.1 mm or more and 0.5 mm or less. Additionally, as shown in Modification 1 described later, the coating film 30 may also have an undercut portion 32 that wraps around the other end face of the through hole 12. Figure 5B ).

[0089] The coating film 30 can also impart uneven or wrinkled shapes to the surface. This results in high decorative quality. In addition, the coating film 30 uses a two-component curing type paint with high fluidity, or a one-component paint in which the main agent and curing agent are pre-mixed and injected into the mold, thus enabling high-precision transfer of uneven or wrinkled shapes onto the mold surface.

[0090] <Optical Equipment> like Figure 2A and Figure 2B As shown, the optical device 100 of Embodiment 1 includes: the aforementioned resin molded article 50 with a coating film; a substrate (shielding portion) 52, covering the periphery of the other end face of the through hole 12, forming a dark chamber 54 between the substrate (shielding portion) and the back surface 16 of the resin molded article 50 with the coating film; and an LED (light irradiation portion) 60 disposed in the dark chamber 54. Figure 2A As shown, with the LED 60 turned off, a dark chamber 54 is formed between the back surface 16 of the resin molded article 50 with a coated film, which includes the through hole 12, and the substrate 52, making the through hole 12 invisible from the surface. On the other hand, as Figure 2B As shown, when LED60 is turned on, light 62 from LED60 reaches the surface through through hole 12, thus making through hole 12 visible from the surface.

[0091] Therefore, according to the optical device 100, it has high decorative quality, can perform high-precision light display, and on the other hand, it has the ability to shield symbols and the like from being seen outside of use.

[0092] The following describes the constituent elements of the optical device 100, excluding the resin molded article 50 with coating film described above.

[0093] <Concealed Area> The shielding portion 52 can also be a substrate, for example. The substrate 52 only needs to cover the area around the other end face of the through hole 12, forming a dark chamber 54 between itself and the back surface 16 of the resin molded article 50 with the coated film. It should be noted that... Figure 2A , Figure 2B In this process, the entire back surface 16 of the resin molded article 50 with the coating film is covered by the substrate 52, but it is not limited to this; it is acceptable as long as the back surface 16 can be partially covered to form a darkroom. The shielding part 52 is not limited to a flat plate shape, but can also be curved.

[0094] Alternatively, part of the shielding section 52 may be made of a light-transmitting material to draw light from the light source into the darkroom 54.

[0095] <Light irradiation part> The light irradiation unit 60 may be, for example, an LED, a light bulb, or the like that can be placed inside the darkroom 54. Alternatively, as described later, it may be a combination of a light-transmitting shielding part and a light source, in a way that guides light from an external light source into the darkroom 54, allowing light to be transmitted from the external light source and enter the darkroom 54.

[0096] <Manufacturing Method of Resin Molded Articles with Coated Film (Manufacturing Method of In-Mold Coated Articles)> Figure 3AThis is a schematic cross-sectional view showing the process of forming a one-time resin molded part 10 with a through hole in the manufacturing method of the resin molded article 10 with a coating film according to Embodiment 1. Figure 3B It means in Figure 3A A schematic cross-sectional view of a primary resin molding component 10 formed between a first core mold 72 and a resin molding cavity mold 74 during the process. Figure 3C This is a schematic plan view showing the case where eight primary resin molded parts 10 are formed simultaneously in the process of forming a primary resin molded part 10 with a through hole.

[0097] The following describes a method for manufacturing a resin molded article with a coating film according to Embodiment 1. This method includes a resin molded article forming step (…). Figure 3A , Figure 3B , Figure 3C ) and coating injection process ( Figure 4A , Figure 4B ).

[0098] <Forming process of one-time resin molded parts> The resin-molded part 10 is formed using a resin-molded mold 70 in an in-mold coating mold set. Specifically, as... Figure 3A and Figure 3B As shown, the first core mold 72 and the cavity mold 74 of the resin molding mold 70 are closed to define a resin molding cavity 76 corresponding to the resin molded article 10. Then, primary resin is introduced into the resin molding cavity 76 from the injection resin gate 78 via the runner gate 79. Thus, a resin molded article 10 containing primary resin is formed.

[0099] After the resin has cured once, the first core mold 72 and the resin molded article are molded together using the mold cavity mold 74 to obtain the resin molded article 10. Additionally, as... Figure 3C As shown, even when the primary resin molding component 10 is small, it is possible to form 8 primary resin molding components 10 at the same time.

[0100] Furthermore, when forming the one-piece resin molded part 10, for example, as Figure 3C As shown, a runner gate 79 can also be formed simultaneously with the formation of the primary resin molded part 10, which guides paint from the paint injection head 88 to the paint film cavity 86 when the first core mold 72 is moved to a position opposite to the coating film cavity mold 84. In this case, during the formation process of the primary resin molded part 10, in addition to the path from the injection resin gate 78 to the resin molded part cavity 76, it is also necessary to guide primary resin to the path 79a from the injection resin gate 78 to the paint injection head 88 (after moving in the first core mold).

[0101] However, it is not always necessary to manufacture a primary resin molded part through injection molding. For example, it can be formed by pre-machining or by 3D printing. Alternatively, a primary resin molded part obtained by various methods can be placed in a mold or fixture for coating film formation, and manufactured by covering the through holes and surfaces of the primary resin molded part with a coating. Furthermore, the method for obtaining a primary resin molded part is not limited to the methods described above, as long as it is possible to obtain the coated resin molded article of the present invention. Other methods may also be used.

[0102] <Forming process of resin molded articles with coated film> Figure 4A This is a schematic cross-sectional view showing the process of forming a resin molded article with a coating film in the manufacturing method of the resin molded article 50 with a coating film according to Embodiment 1. Figure 4B It is shown in Figure 4A A schematic cross-sectional view of a resin molded article 50 with a coating film formed between the second core mold 82 of the coating film mold 80 and the coating film cavity mold 84 during the process.

[0103] (1) As Figure 4A , Figure 4B As shown, during the formation of the coating film, a primary resin molding component 10 is placed on the second core mold 82. A paint injection head 88 is installed in the coating film cavity mold 84, and the paint injection head 88 is positioned close to the runner gate 79. (As shown...) Figure 4B As shown, when the second core mold 82 and the coating film cavity mold 84 are closed, a coating film cavity 86 is formed between the resin molded article 10 and the coating film cavity mold 84.

[0104] In addition, regarding Figure 3A The first core mold 72 and Figure 4A The second core mold can also be the same mold used continuously. That is, the first core mold 10 formed on the first core mold 72 in the forming process of the first core mold 10 can also be used as the second core mold 82 (72) in the forming process of the resin molded article with coating film while it is placed on the first core mold 72.

[0105] Alternatively, the mold cavity 74 for resin molding and the mold cavity 84 for coating film can be arranged side by side, so that the first core mold 72 is as follows: Figure 4A As indicated by the arrow, it moves parallel to the position opposite to the mold cavity 74 for resin molding and to the position opposite to the mold cavity 84 for coating film.

[0106] (2) Next, a translucent paint is introduced from the paint injection head 88 through the runner gate 79 into the coating film cavity 86. The paint fills the coating film cavity 86 to form a coating film 30.

[0107] Any transparent resin can be used as the coating. For example, if the coating injection head 88 is a commonly used injection head, it can also be a type of injection head that mixes the base agent, hardener, filler, colorant, or other coatings within the head by collision. Alternatively, an injection head can be used where the base agent and hardener, filler, or colorant are pre-mixed in the can, and the coating is injected without being mixed into a single liquid.

[0108] Furthermore, the viscosity of the coating is, for example, in the range of 50 to 1,000 mPa·s between 60°C and 100°C. More preferably, it is 50 to 500 mPa·s, and even more preferably, it is 50 to 300 mPa·s. If it is 50 mPa·s or higher, it is easier to prevent the coating from leaking from the mold and fixture, and if it is 300 mPa·s or lower, the coating has better flowability in the thin film stage.

[0109] In the case of two-component curing, when using the main agent, curing agent, and colorant in the same viscosity range, the dispersibility during collision mixing in the injection head is improved. Therefore, it is preferable to use coatings in which the main agent, curing agent, and colorant all fall within the above-mentioned viscosity range. In addition, the above-mentioned viscosity range is also preferred in the case of one-component curing.

[0110] (3) Figure 4B As shown, the coating material is filled into the mold cavity 86 for coating film and then cured. It should be noted that the curing method is not limited to the case of curing over time as described above; it can also be cured by heating. Alternatively, a portion of the mold can be irradiated with ultraviolet light or similar transparent material to cure it.

[0111] (4) After the coating film 30 has cured, the resin molded article 50 with the coating film (in-mold coated molded article) is demolded by being pushed out of the second core mold 82 (72) along the Z direction by an ejector pin (not shown) located inside the second core mold 82 (72). It should be noted that there can be one or more ejector pins, or two or more ejector pins. In addition, the ejector pin driving method can be any commonly used method, such as hydraulic, pneumatic or mechanical drive.

[0112] Thus, a resin molded article with a coating film (in-mold coated molded article) 50 can be obtained.

[0113] It should be noted that in this process, in-mold coatings are not used; instead, a two-color molding method using a molding resin that ensures adhesion to the primary resin in two-color molding is also considered. However, in the two-color molding process, the surface of the thermoplastic resin has low damage resistance, and the viscosity of the molding resin itself is higher than that of the in-mold coating used in this disclosure. Therefore, the filling capacity of the molding resin in the film to the through holes and the surface is low, and the thickness of the surface layer formed by the molding resin becomes thicker, resulting in an increase in the overall thickness of the part. In addition, due to this reason, the wall thickness difference of the transparent molding resin between the through holes and other parts becomes larger, which can easily cause appearance problems such as shrinkage marks on the surface of the molded part caused by the difference in shrinkage caused by the difference in the wall thickness of the transparent resin (molding resin). Furthermore, in designs where a wrinkled surface finish is desired on the transparent resin (molding resin), the wall thickness of the transparent resin (molding resin) increases. Consequently, the thickness of the transparent resin (molding resin) layer through which light emitted from the through-hole formed in the primary resin molding component passes increases, thus lengthening the distance to the wrinkled surface and easily causing light diffusion. Furthermore, because the wrinkled shape of the surface causes light diffusion, the display of symbols and markings is easily blurred when viewed visually, becoming a major cause of reduced visibility.

[0114] Due to the main reasons mentioned above in the two-color molding process, compared with the two-color molding process, the use of in-mold coating with high fluidity allows for easy filling into thin films and fine shapes, which has advantages.

[0115] (Variation Example 1) Figure 5A This is a schematic cross-sectional view of the resin molded article 50a with a coating film of modified example 1. Figure 5B It means Figure 5A A partial enlarged view of the undercut portion 32 on the back side 16 near the through hole 12.

[0116] In the resin molded article 50a with a coated film in Modified Example 1, such as Figure 5B As shown, a bottom cut 32 is provided where the coating material enters the back surface 16 from the periphery of the other end face of the through hole 12. This is because the coating material forming the coating film 30 has a low viscosity, and therefore leaks slightly from the other end face of the through hole 12 of the primary resin molding component 10. Through this bottom cut 32, the adhesion between the primary resin molding component 10 and the coating film 30 is strengthened.

[0117] Alternatively, the one-time resin molding component 10 may also have pleats 22 on the inner side of the through hole 12. By having pleats 22 on the inner side of the through hole 12, the coating film 30 filling the through hole 12 is difficult to peel off.

[0118] In addition, a structure that allows light to easily pass through may be provided inside the through-hole 12. Thereby, the light transmission efficiency through the through-hole 12 is improved.

[0119] As such a structure, for example, the inner wall surface of the through-hole may be a smooth surface, a mirror surface, a polished surface, a surface-treated surface, a curved surface, a surface formed with fine ribs (grooves, linear processing), or the like. Thereby, the light passing through the through-hole 12 is likely to be reflected by the wall surface of the through-hole 12 or leak to the outside. As a result, the light transmittance is increased.

[0120] In addition, for example, a hologram or the like may be used to form a surface that improves the above transmittance not on the inner wall surface but on the lower surface of the filled resin.

[0121] In addition, it may have a holographic function toward the upper surface, or such a shape and function may be imparted in a subsequent process.

[0122] In addition, in order to further improve the transmittance, a low refractive index material may be added to the coating film, and the light transmittance may be improved by reducing the refractive index of the coating film itself.

[0123] (Embodiment 2) Figure 6A It is a schematic cross-sectional view observed from a direction perpendicular to the center of the through-hole 12 of the resin molded product 50b with a coating film according to Embodiment 2. Figure 6B It is a component of Figure 6A An enlarged cross-sectional view of part B near the through-hole 12 of the primary resin molded part 10 of the resin molded product 50b with a coating film. Figure 6C It is shown in Figure 6B An enlarged cross-sectional view of the state where a coating film 30 is formed near the through-hole 12.

[0124] The resin molded product 50b with a coating film according to Embodiment 2 is different from that of Embodiment 1 in that, in the primary resin molded part 10, there are wall thickness change parts where the wall thickness thickens in three stages: the inner edge part 17 constituting the through-hole 12, the outer edge part 18a outside the inner edge part 17 in the radial direction, and the outer edge part 18b. Specifically, the wall thickness a of the inner edge part 17, the wall thickness b of the outer edge part 18a, and the wall thickness c of the outer edge part 18b have a size relationship of a < b < c. By making the wall thickness change in multiple stages, it is possible to suppress a decrease in strength caused by a sharp wall thickness change and the generation of sink marks during the formation of the primary resin molded part. In addition, the wall thickness change part is not limited to being stepped as described above, and the wall thickness may change continuously.

[0125] In addition, in the formation stage of the primary resin molded part, when a concave part 77 having a small radial length x is provided near the through-hole 12 of the first core mold 72, as Figure 6BAs shown, there is a case where the protrusion 19 is formed by not filling the concave portion 77 when the length x is the viscosity of the primary resin. In addition, the length x is, for example, 0.5 mm or less. In addition, the relationship of x < a < b < c can also be satisfied.

[0126] In such a case, at the stage of forming the resin molded product with a coating film, the low-viscosity coating fills the gap between the protrusion 19 near the through-hole 12 and the concave portion of the second core mold 82 (72) to form the undercut portion 32. Through this undercut portion 32, the adhesion between the primary resin molding member 10 and the coating film 30 becomes stronger.

[0127] (Variation Examples 2 to 4) Figure 7A It is a schematic cross-sectional view of the resin molded product 50c with a coating film of Variation Example 2. Figure 7B It is a schematic cross-sectional view of the resin molded product 50d with a coating film of Variation Example 3. Figure 7C It is a schematic cross-sectional view of the resin molded product 50e with a coating film of Variation Example 4.

[0128] The resin molded product 50c with a coating film of Variation Example 2 is characterized in that the primary resin molding member 10 is flat. The resin molded product 50d with a coating film of Variation Example 3 is characterized in that the coating film 30 is provided not only covering the upper surface of the primary resin molding member 10 but also covering the side surface. The resin molded product 50e with a coating film of Variation Example 4 is characterized in that the coating film 30 has a wrap-around (portion C) from the surface of the primary resin molding member 10 to the back side.

[0129] As Figures 7A to 7C shown, the primary resin molding member 10 and the coating film 30 can be appropriately selected in shape according to the use.

[0130] (Variation Example 5) <Optical Device> Figure 8A It is a schematic cross-sectional view showing the case where the LED as the light irradiation unit 60 in the optical device 100 of Embodiment 1 is housed in the dark room 54. Figure 8B It is a schematic cross-sectional view showing the case where the light irradiation unit in the resin molded product 100a with a coating film of Variation Example 5 is the optical fiber 60a inserted into the dark room from outside the dark room.

[0131] As Figure 8BAs shown, the optical device 100a of Modified Example 5 differs from that of Embodiment 1 in that it includes a resin molded article 50 with a coated film, a substrate 52 serving as a shielding portion, and an optical fiber 60a serving as a light irradiation portion. The light irradiation portion is not limited to LEDs, bulbs, etc., placed inside the dark chamber 54 as in the optical device of Embodiment 1, but can also be an optical fiber inserted into the dark chamber 54 from the outside. The dark chamber 54 is formed by covering the area around the other end face of the through hole 12 with the substrate 52 serving as the shielding portion. In addition, the optical fiber 60a, serving as the light irradiation portion, guides light from a light source 64 outside the dark chamber 54 formed by the shielding portion 52 into the interior of the dark chamber 54, irradiating light 62 onto the other end face of the through hole 12.

[0132] According to this optical device, when light is not irradiated from the optical fiber 60a (which serves as the light irradiation unit) to the other end face of the through-hole 12 (illumination off), the dark chamber 54 remains relatively dark, and therefore the through-hole 12 cannot be seen from one end face. On the other hand, when light 62 is irradiated from the optical fiber 60a (which serves as the light irradiation unit) to the other end face of the through-hole 12 (illumination on), the light 62 passes through the coating film 30 containing the light-transmitting resin from the other end face of the through-hole 12 and is transmitted to one end face of the through-hole 12, emitting light in the shape of the through-hole 12, thus making the shape of the through-hole 12 visible. Therefore, when the illumination is off, only the coating film 30 covering the surface of the resin-molded component 10 can be seen, and when the illumination is on, the shape of the through-hole 12 can be seen. That is, for example, by forming a symbol with the shape of the through-hole 12, the symbol formed by the through-hole 12 can be obscured when the illumination is off, and the symbol can be seen when the illumination is on.

[0133] Alternatively, as a method of drawing light from an external light source 64 into a darkroom 54 without using an optical fiber 60a, a light-transmitting material may be used for part or all of the substrate 52.

[0134] (Variations 6-8) Figure 9A This is a schematic cross-sectional view of the resin molded article 50f with a coated film of variation 6. Figure 9B This is a schematic cross-sectional view of 50g of a resin molded article with a coating film, as described in Modified Example 7. Figure 9C This is a schematic cross-sectional view of the resin molded article 50h with a coating film of variation 8.

[0135] The resin molded article 50f with a coated film in Modification 6 is characterized in that the through hole 12 of the primary resin molded component 10 is tapered, with the hole diameter increasing from the surface to the back side. By expanding the back side, a large amount of light can be guided. On the other hand, by narrowing the surface side, an aperture can be applied, diffusion can be suppressed, and display blurring can be suppressed.

[0136] The 50g resin molded article with a coated film in Modification 7 is characterized in that the through hole 12 of the primary resin molded part 10 has a protrusion 24 on its inner side. The protrusion 24 may also be formed, for example, by rough machining.

[0137] Furthermore, the shape is not limited to being made by injection molding; for example, it can also be formed by pre-machining, partial sandblasting of the wall surface of the through hole 12, etc. Alternatively, the through hole 12 of a one-piece resin molded part can be formed using a 3D printer. Any appropriate method can be chosen.

[0138] The resin molded article 50h with a coated film in Modification Example 8 is characterized in that the through hole 12 of the primary resin molded part 10 is tapered with the diameter increasing from the back side to the surface, and has an undercut portion 32 of the coated film 30 on the back side. The undercut portion 32 can also be formed by using a low-viscosity coating material to wrap around the coating on the back side.

[0139] According to the resin molded articles 50f~h with coating film involved in the modifications 6 to 8, the coating film 30 is difficult to peel off from the primary resin molding part 10 due to the shape of the through hole 12 itself or the undercut portion 32. As a result, the strength of the resin molded articles 50f~h with coating film can be improved.

[0140] (Implementation Method 3) Figure 10 This is a schematic cross-sectional view taken from a direction perpendicular to the center of the through hole 12 of the resin molded article 50i with coating film in Embodiment 3.

[0141] The resin molded article 50i with a coated film in Embodiment 3 differs from the resin molded article with a coated film in Embodiment 1 in that the through-hole 12 is not filled with paint, and is instead formed by a gap from one end face to the other. Since the through-hole 12 is not filled with paint, even if the paint contains filler material, the absence of paint in the through-hole 12 prevents the filler material from becoming trapped in the through-hole and increasing in concentration, thus avoiding difficulties in orientation on the surface of the resin molded article. Furthermore, by eliminating the filler material in the paint, the absence of paint in the through-hole also suppresses the formation of wrinkles caused by the difference in shrinkage rate between the increased resin thickness in the through-hole (when the through-hole is filled with resin) and other shrinkage rates.

[0142] In the process of forming a translucent coating film, when the second core mold 82 and the coating film cavity mold 84 are closed, the second core mold 82 or the coating film cavity mold 84 can be inserted into the through hole 12, such that the interior of the through hole 12 is not included in the coating film cavity. Therefore, without filling the through hole 12 with paint, the through hole 12 can be formed by a gap 34 from one end face to the other. Furthermore, as shown in the modified example 9 described later, it is practically difficult to make it a completely "gap," such as... Figure 11B As shown in the enlarged view, it may also include a case where a very small amount of paint covers a portion of the inner wall starting from one end face of the through hole 12.

[0143] (Variation Example 9) Figure 11A This is a schematic cross-sectional view viewed from a direction perpendicular to the center of the through hole of the resin molded article 50j with coating film in modified example 9. Figure 11B yes Figure 11A An enlarged sectional view of part D.

[0144] The resin molded article 50j with a coated film involved in Modification Example 9 appears at first glance to be similar to the resin molded article with a coated film involved in Embodiment 3, in that the through hole 12 does not appear to be filled with paint. However, it is also possible that... Figure 11B As shown in the enlarged view, a very small amount of paint 36 covers a portion of the inner wall, starting from one end face of the through hole 12. For example, such paint is referred to as a "hook portion." This "hook portion" 36 is sometimes formed unintentionally through gaps in the mold where paint enters.

[0145] (Variations 10 and 11) Figure 12A This is a schematic cross-sectional view viewed from a direction perpendicular to the center of the through hole 12 of the resin molded article 50k with coating film in Modified Example 10. Figure 12B This is a schematic cross-sectional view viewed from a direction perpendicular to the center of the through hole 12 of the resin molded article 50l with coating film in Modified Example 11.

[0146] like Figure 12A As shown, in the resin molded article 50k with a coated film in Modified Example 10, the coating fills a portion of the through-hole 12 with a coating film thickness of, for example, 20% of the length of the coating film along the extending direction of the through-hole 12. Figure 12B As shown, the resin molded article 50l with coating film in Modified Example 11 is filled with coating film with a portion of the through hole 12, for example, 50% of the thickness of the coating film along the extension direction of the through hole 12.

[0147] As shown in variations 10 and 11, the coating film 30 can fill a portion of the through-hole 12. For example, a portion of the through-hole 12 can be filled with a thickness of 5 to 100% of its length along the extending direction of the through-hole 12. Furthermore, a portion of the through-hole 12 can be filled with a thickness of 20 to 50% of its length along the extending direction of the through-hole 12. By setting these ranges, shrinkage marks on the surface of the coating film 30 containing the through-hole 12 can be suppressed. Additionally, when the coating contains a filler material, optical properties can also be obtained by setting these ranges.

[0148] (Implementation Method 4 and Variation 12) Figure 13 This is a plan view of the resin molded article 50m with coating film according to Embodiment 4, viewed from the top surface. Figure 14A It is along Figure 13 A rough cross-sectional view viewed from the EE direction. Figure 14B This is a schematic cross-sectional view of the resin molded article 50n with a coating film of modified example 12.

[0149] like Figure 13 As shown in the plan view, the resin molded article 50m with a coated film in Embodiment 4 forms the symbol 2 of the letter C. (As shown in the plan view...) Figure 14A As shown, symbol 2 is formed by a through hole 12, which is visible from the surface when light is shone from below the through hole 12. Figure 14A In the middle, the back 16 is a single layer. Additionally, in... Figure 14B In the modified example 12 shown, it is a multi-layered structure with an inner edge portion 17 and an outer edge portion 18.

[0150] Furthermore, by adjusting the width of the bridging section, it can be displayed not only as the letter C, but also as the letter O by reducing the width of the bridging section.

[0151] (Implementation Method 5 and Variation 13) Figure 15 This is a plan view of the upper surface of the resin molded article 50o with coating film according to Embodiment 5. Figure 16A It is along Figure 15 A rough cross-sectional view viewed from the FF direction. Figure 16B This is a schematic cross-sectional view of a 50p resin molded article with a coated film, as described in Modified Example 13.

[0152] like Figure 15 As shown in the plan view, the resin molded article 50o with a coated film in Embodiment 5 forms the symbol 4 of the letter O. (As shown in the plan view...) Figure 16AAs shown, symbol 4 is composed of a through hole 12 and a bottom hole 38. As a symbol, in the case of a structure where the center and outer parts are separated, such as the letter O or the Arabic numeral 0 (zero), if the entire symbol were to be formed by a through hole, the center would fall off from the outside; therefore, this cannot be achieved using only a through hole. Therefore, for example, in… Figure 16A In this design, a portion of the through-hole 12 is designated as a bottomed hole 38. A so-called floating island structure, consisting of a central island surrounded by the through-hole 12 and a bridging portion connecting to the outside via the bottomed hole 38, forms the letter O as the symbol 4. In this case, for example, by appropriately setting the width of the bridging portion defined by the width of the bottomed hole 38, when light shines from the lower part of the through-hole 12, light from the surrounding through-holes 12 is guided to the upper part of the bottomed hole 38, thus displaying the letter O. This makes the bridging portion inconspicuous.

[0153] Furthermore, by adjusting the width of the bridging section, it can be displayed not only as the letter O, but also as the letter C by increasing the width of the bridging section.

[0154] In addition, Figure 16A In the middle, the back side 16 is a single layer, which is the same side. Additionally, in... Figure 16B In the modified example 13 shown, it is a multi-layered structure with an inner edge portion 17 and an outer edge portion 18.

[0155] (Variations 14 to 17) Figures 16C to 16F These are schematic cross-sectional views of resin molded articles 50q, 50r, 50s, and 50t with coated films, as shown in variations 14 to 17.

[0156] In the resin molded article 50q with a coated film in Modified Example 14, a portion of the through hole 12 is filled with a coated film 30. Specifically, the thickness is the same as that of the coated film filling the bottom hole 38. In the resin molded article 50r with a coated film in Modified Example 15, the difference from Modified Example 14 is that it is a multilayered structure having an inner edge portion 17 and an outer edge portion 18.

[0157] In the resin molded article 50s with a coating film in Modified Example 16, the through hole 12 is not filled with a coating film, and the coating film 30 covers one end face of the through hole and the surface of the primary resin molded part surrounding the one end face of the through hole. In the resin molded article 50t with a coating film in Modified Example 17, the difference from Modified Example 16 is that it is a multilayered structure having an inner edge portion 17 and an outer edge portion 18.

[0158] (Variations 13 and 18) Figure 17 This is a plan view of the upper surface of the resin molded article 50p with coating film in Modified Example 13. Figure 18AThis is a schematic cross-sectional view of a 50p resin molded article with a coated film, as described in Modified Example 13. Figure 18B This is a schematic cross-sectional view of the resin molded article 50u with a coated film of variation 18. Figure 19 It means Figure 17 A partial plan view of the central island portion 42, the surrounding through holes 12, and the lower bridging portion 44 with bottom holes 38. Figure 20A It is along Figure 19 A schematic cross-sectional view of the H section viewed from the GG direction, the H section including a coating film 30 filled with through holes and a bridging portion 44 at the bottom with bottom holes 38.

[0159] As mentioned above, such as Figure 17 As shown in the plan view, the resin molded article 50p with coating film in Modified Example 13 forms the symbol 4 of the letter O. The difference between Modified Example 13 and the resin molded article 50u with coating film in Modified Example 18 is that the through hole 12 has a tapered portion 40 extending towards the back side. Therefore, the coating film 30 filling the through hole 12 is difficult to detach.

[0160] like Figure 20A As shown, when light 62 is irradiated from the lower part of the through hole, the light 62 flows around the coating film 30 filling the through hole and into the upper part of the bottom hole 38, and then leaks out to the surface, where the symbol 4 of the letter O can be seen. Furthermore, in the resin molded article 50u with coating film in Modified Example 18, the through hole 12 has a downwardly extending tapered portion 40, which makes it easier to guide light from below.

[0161] (Variations 19 and 20) Figure 20B This is a schematic cross-sectional view of the H portion of the resin molded article with a coating film, including the through hole of the coating film 30 of the filled modified example 19 and the bridging portion 44a of the lower portion with a bottom hole 38a. Figure 20C It is a schematic cross-sectional view of the H portion of the resin molded article with a coating film, including the through hole of the coating film 30 of the filled modified example 20 and the bridging portion 44b of the lower portion with a bottom hole 38b.

[0162] In the resin molded article with a coated film in Modified Example 19, the upper part of the bridging portion 44a is designed as a thin cone. This facilitates the guidance of light from the lower part to the upper part. Furthermore, the coating flows easily during manufacturing.

[0163] In the resin molded article with a coated film in Modified Example 20, the bridging portion 44b is a tapered shape with a thicker upper part. As a result, the coated film is less likely to peel off.

[0164] (Variations 21 and 22) Figure 21A This is a plan view of the top surface of the resin molded article 50v with a coated film, which is a modified example 21. Figure 21BThis is a plan view of the upper surface of the resin molded article 50w with a coated film as described in Modified Example 22.

[0165] As shown in the plan view of Figure 21, the resin molded article 50v with a coated film in Modification 21 is shaped like a triangle (symbol 6). In Modification 21, a bridging portion is provided at the vertex of the triangle. In this case, it can also be constructed with a floating island structure, similar to Embodiment 5 and Modifications 13 to 20. The difference between Modification 21 and the resin molded article 50w with a coated film in Modification 22 is that a bridging portion is provided on the side of the triangle.

[0166] [Industrial Applicability] The resin molded article with a coating film according to the present invention has high decorative quality when used in optical equipment, enabling high-precision light display, and also has the property of shielding symbols and the like from being seen except when in use.

Claims

1. A resin molded article with a coated film, comprising: One-piece resin molded component, having a through hole; and A translucent coating film covers one end face of the through hole of the primary resin molding component and the surface of the primary resin molding component surrounding the one end face of the through hole.

2. The resin molded article with a coated film according to claim 1, wherein, The coating film fills a portion of the through hole.

3. The resin molded article with a coated film according to claim 1, wherein, The coating film covers a portion of the inner wall of the through hole from one end face of the through hole.

4. The resin molded article with a coated film according to claim 1, wherein, The coating film fills from one end face of the through hole to the other end face.

5. The resin molded article with a coated film according to claim 4, wherein, The coating film has an undercut portion that extends from the other end face of the through hole into the back side of the primary resin molding component.

6. The resin molded article with a coated film according to claim 1, wherein, The through hole is formed by a gap from one end face to the other end face.

7. The resin molded article with a coated film according to claim 1, wherein, The coating film contains fillers, pigments, or dyes.

8. The resin molded article with a coated film according to claim 1, wherein, The wall thickness of the inner edge portion constituting the through hole of the primary resin molding component is thinner than the wall thickness of the outer edge portion located radially outside the through hole.

9. The resin molded article with a coated film according to claim 1, wherein, The primary resin molding component has a wall thickness variation section where the wall thickness increases from the inside to the outside in the radial direction of the through hole.

10. The resin molded article with a coated film according to claim 1, wherein, The through hole has an uneven, wrinkled, or conical shape on its inner side, and the primary resin and the coating film are bonded together by engaging the uneven, wrinkled, or conical shape.

11. The resin molded article with a coated film according to claim 1, wherein, The coating film is given an uneven or wrinkled shape on the surface.

12. The resin molded article with a coated film according to claim 1, wherein, The coating film is a cured paint.

13. The resin molded article with a coated film according to claim 1, wherein, The coating film extends from one end face of the through hole onto the surface of the primary resin molding component and has an undercut portion that wraps around from the end of the surface to the back side of the primary resin molding component.

14. An optical device comprising: The resin molded article with a coated film as described in claim 1; A shielding portion, covering the area around the other end face of the through hole, forms a dark chamber between the shielding portion and the back surface of the resin molded article with the coated film; and The light irradiation section irradiates light from the dark chamber formed between the back side of the resin molded article with the coating film and the shielding section onto the other end face of the through hole.

15. A method for manufacturing a resin molded article with a coated film, comprising: The process of preparing a one-time resin-molded part with a through hole; as well as A process of forming a light-transmitting coating film covering one end face of the through hole of the primary resin molding component and the surface of the primary resin molding component surrounding the one end face of the through hole, to obtain a resin molded article with the coating film having the primary resin molding component and the coating film.

16. The method for manufacturing a resin molded article with a coated film according to claim 15, wherein, The process of preparing a one-piece resin molded part having the through hole includes: In the first mold-closing process, the first core mold and the cavity mold of the resin mold are closed to define the mold cavity of the resin mold corresponding to the primary resin molding component having the through hole. In the resin introduction process, primary resin is introduced into the mold cavity of the resin molded article to form the primary resin molded part having the through hole. as well as In the mold-opening process, the first core mold and the resin molded product are opened using a mold cavity mold to obtain a one-time resin molded part with a through hole.

17. The method for manufacturing a resin molded article with a coated film according to claim 15, wherein, The process of preparing a primary resin molded component having the through hole is a process of cutting and machining a primary resin raw material that has been molded into an arbitrary shape to obtain the primary resin molded component having the through hole.

18. The method for manufacturing a resin molded article with a coated film according to claim 15, wherein, The process of preparing a primary resin molded part having the through hole is a process of forming the primary resin molded part by using a 3D printer.

19. The method for manufacturing a resin molded article with a coated film according to any one of claims 15 to 18, wherein, The process of forming a translucent coating film includes: In the second molding process, the primary resin molding component having the through hole is placed in the second core mold, and the second core mold is closed with the coating film mold to define the coating film mold cavity containing the one end face of the through hole. In the coating filling process, a translucent coating is filled into the mold cavity of the coating film, and the coating is used to form a coating film covering the surface of the primary resin molding component that covers the one end face of the through hole and the area surrounding the one end face of the through hole. as well as In the demolding process, the second core mold and the coating film mold cavity are opened, and a resin molded article with the coating film is extruded from the inside of the second core mold to obtain the resin molded article with the coating film.

20. The method for manufacturing a resin molded article with a coated film according to claim 19, wherein, In the coating filling process, a coating film is formed that includes the through holes filled by the coating.

21. The method for manufacturing a resin molded article with a coated film according to claim 19, wherein, The second core mold has a recess for introducing the coating material on the back side of the through hole of the primary resin molding component facing the second core mold. In the coating filling process, the coating is introduced from the surface of the through hole facing the mold cavity of the coating film toward the back side, and extends from one end face of the through hole onto the surface of the primary resin molding component, forming an inset portion that wraps around from the end of the surface to the back side of the primary resin molding component.

Images