Resin molded product, mold, manufacturing method of resin molded product, camera, and printer

Abstract

To realize a resin molded product that can achieve a luxurious color without painting in response to recent demands for diversity in product design, and in particular for a luxurious deep black exterior to enhance design.SOLUTION: A resin molded product having a plurality of convex portions in a predetermined region is provided so that the height of the plurality of convex portions is 2 μm or more and 15 μm or less, and an arithmetic mean height Sa of a high frequency component in the predetermined region is 12 nm or more and 20 nm or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a resin molded product, a mold, a method for manufacturing a resin molded product, a camera, and a printer. [Background technology]

[0002] High design quality is required for the exterior surfaces of resin parts used in the housings and shells of various products, including electronic devices such as digital cameras and printers. For example, smoothing the surface of a part can give it a mirror-like shine, creating a lustrous aesthetic, or conversely, creating minute, invisible irregularities on the surface of a part can create a matte texture.

[0003] Painting the exterior surfaces of molded products has long been used as a method for enhancing the texture and design of the exterior surfaces of resin products. However, because painting is applied to each individual molded product, it is not always suitable for mass production in terms of uniformity, variation, labor hours, productivity, cost, etc.

[0004] Therefore, attempts have been made to improve the texture of the exterior surface by devising the molding surface of the mold used when molding resin, without relying on painting.

[0005] For example, Patent Document 1 proposes a method for manufacturing a molding die for obtaining a textured product with improved design and scratch resistance. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 9-314569 Summary of the Invention [Problem to be solved by the invention]

[0007] In recent years, there has been a demand for diversity in product design, and in particular, there is a demand for a luxurious deep black exterior to enhance design.

[0008] For example, when expressing a deep, luxurious black color through painting, techniques such as applying multiple layers of lacquer or painting multiple layers of paint with different reflectivity and materials are used to express the depth of the black. Another known method is to create layers of materials with different reflectivity, creating areas with strong and weak light, to create a deep black color.

[0009] However, as already mentioned, the painting method is not necessarily suitable for mass production in terms of uniformity, variation, man-hours, productivity, cost, and the like.

[0010] The present invention has been made in view of the above-mentioned problems, and aims to provide a resin molded product that can achieve a luxurious color without being painted. [Means for solving the problem]

[0011] One aspect of the present invention is a resin molded product having a plurality of convex portions in a predetermined region, characterized in that the height of the plurality of convex portions is 2 μm or more and 15 μm or less, and the arithmetic mean height Sa of the high-frequency components in the predetermined region is 12 nm or more and 20 nm or less. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a resin molded product that can achieve a luxurious color without painting. [Brief explanation of the drawings]

[0013] [Figure 1] 1A is a perspective view schematically illustrating an enlarged portion of an outer surface of a resin molded article according to an embodiment, and FIG. 1B is a cross-sectional view taken along line A1-A2. [Figure 2] A diagram showing the BRDF values ​​of painted black. [Figure 3] A diagram explaining the principle of how we perceive black. [Figure 4] 1A is a schematic perspective view showing an example of a mold for molding a resin molded article according to an embodiment, and FIG. 1B is a schematic perspective view showing an example of a resin molded article according to an embodiment. [Figure 5] 10A and 10B are diagrams for explaining a method for manufacturing a mold using a laser processing machine. [Figure 6] (a) Diagram showing the setup of the injection molding machine. (b) Diagram showing the mold clamping process. (c) Diagram showing the injection process. (d) Diagram showing the pressure holding and cooling processes. (e) Diagram showing the mold opening and demolding processes. [Figure 7] (a) Measured BRDF value of a resin molded product. (b) Image showing the height information of the resin molded product. [Figure 8] FIG. 2 is a cross-sectional view of a resin molded product. [Figure 9] (a) Image of the vertices of the convex parts of a resin molded product. (b) Image showing the height information of the high-frequency components of the resin molded product. [Figure 10] 1A is an external view of a camera including a resin molded product according to an embodiment, and FIG. 1B is an external view of a printer including a resin molded product according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A resin molded product, a method for manufacturing a resin molded product, a mold, a device including a resin molded product, and the like, which are embodiments of the present invention, will be described with reference to the drawings.

[0015] Note that the exterior surfaces of the resin molded products in the embodiments described below are not necessarily limited to surfaces exposed on the front side of the housing, outer shell, etc. of the device. Even if a surface is not always visible to the user, for example, a surface that becomes visible when a door, hatch, or lid of the device is opened may be treated as an exterior surface. Therefore, in the following, a surface of a resin part or resin product that may be visible to the user may be referred to simply as an "exterior surface."

[0016] In the drawings referred to in the following description of the embodiments, elements denoted by the same reference numerals have the same functions unless otherwise specified.

[0017] (Regarding resin molded products) Regarding a resin molded product according to an embodiment, the shape of the outer surface as a predetermined region that gives an observer a sense of a luxurious color without the need for painting will be described. Fig. 1(a) is a perspective view showing an enlarged schematic view of a portion of the outer surface (predetermined region) of the resin molded product according to the embodiment, and Fig. 1(b) is a cross-sectional view showing the shape of the outer surface taken along line A1-A2 in Fig. 1(a). As shown in Figs. 1(a) and 1(b), the outer surface of the embodiment has many minute protrusions.

[0018] FIG. 2 is a diagram showing the BRDF (Bidirectional Reflectance Distribution Function) value of black achieved by painting. BRDF is a bidirectional reflectance distribution function, and it represents the angular distribution characteristics of reflected light when light is incident from a specific angle. In this embodiment, the objective is to reproduce a deep black color on a resin surface while suppressing the glossiness of a painted surface, as shown in FIG. 2. In other words, the objective is to reproduce a BRDF value equivalent to that of a painted surface that gives the impression of a deep black color while suppressing glossiness, by processing the surface shape of a black-colored resin layer.

[0019] Figure 3 is a diagram explaining the principle behind the perception of black when viewed by humans. Figure 3(a) shows the appearance of molded article 31 when incident light 35 is irradiated onto it and a person views molded article 31 at location 34. Figure 3(b) shows the appearance of molded article 31 as viewed by an observer at location 34.

[0020] Region 32 of molded product 31 indicates the area where the effect of specular reflection of incident light 35 can be seen. Region 33 of molded product 31 indicates a location at an angle between -30° and 0° (where the effect of specular reflection is minimal), away from the area of ​​specular reflection of incident light 35. When humans judge the color of a molded product, they do not judge it from only one location on the molded product, but rather from multiple locations, particularly high-gloss and low-gloss areas, and judge the color based on the glossiness of those areas—in the case of black, the depth of the black. In the example shown in Figure 3(b), when viewing only region 32 where specular reflection of incident light 35 can be seen, the light reflection is strong, and the observer cannot judge the black color of molded product 31 from region 32 alone. However, by making the glossiness of region 33, which is away from region 32 where specular reflection is seen, different from that of region 32, the observer can perceive the depth of the black color. In other words, by configuring the surface so that such differences in glossiness occur between adjacent regions, the degree of blackness when viewed can be adjusted.

[0021] In terms of BRDF values, the observer can perceive a deep black color (blackness) by suppressing the peak luminance 21 of the BRDF value in the specular reflection region 32 and suppressing the luminance 22 in the region 33 where the reflection angle is between -30° and 0°. In other words, if the surface has a peak luminance of between 62 and 112 cd / m2 and an average luminance of between 10 and 19 cd / m2 at a reflection angle between -30° and 0°, it can be said that the surface has a low gloss and can be perceived as a deep black color.

[0022] In this embodiment, a deep black color with reduced gloss is reproduced by providing a concave-convex structure in a predetermined area on the surface of the resin molded product. Such a concave-convex structure on the surface of the resin molded product can be provided, for example, by forming a fine pattern (convex and concave) on the surface of a mold (casting mold or press mold) and then transferring the pattern on the surface of the mold to the molded product.

[0023] The inventors have found that such peak brightness can be adjusted by controlling the structure of the uneven structure of the resin molding, which is on the order of several tens of micrometers, and further that the average brightness at a reflection angle of -30° or more and 0° or less can be adjusted by controlling the structure of less than 1 micrometer.

[0024] Specifically, the concave-convex structure of the resin molded product is preferably provided so that the average spacing between the apexes of the plurality of protrusions 11 dispersedly arranged in a predetermined region is 20 μm to 60 μm, and the height of the plurality of protrusions 11 is 2 μm to 15 μm. When expressed as an arithmetic mean height Sa, it is preferably 2.0 μm to 3.0 μm.

[0025] By setting the spacing within this range, the peak luminance can be set to 62 to 112 cd / m². Here, if the average spacing is less than 20 µm, the convex portions will overlap too much and the convex portions will no longer be able to maintain their shape, which is undesirable. Also, if the average spacing exceeds 60 µm, the entire surface of the resin molded product will not be covered with the convex portions, exposing the original surface of the resin molded product. This is undesirable, as it results in the peak luminance value of the gloss that gives the impression of black being outside the desired range.

[0026] Next, we will explain the structure of the concave-convex structure of the resin molded product that is less than 1 μm. The enlarged area 12 in FIG. 1(b) shows the surface roughness of the high-frequency components present on the convex portions 11 of the concave-convex structure of the resin molded product. The surface roughness of the high-frequency components is obtained by removing the micron-order profile from the overall profile of the A1-A2 cross section in FIG. 1(b). For example, this is the surface roughness in a profile obtained by removing height information of 1 μm or more from the height information of the multiple convex portions 11 of the resin molded product in this embodiment.

[0027] The arithmetic mean height Sa of the high-frequency components of the uneven structure of such a resin molded product is preferably set to 12 nm or more and 20 nm or less. By setting the arithmetic mean height Sa of the high-frequency components in this way, it is possible to obtain a surface with an average luminance of 10 to 19 cd / m2 at a reflection angle of -30° to 0°.

[0028] It is preferable that the concave-convex structure be formed so that the curvature of the convex portions of the resin molded product is approximately the same. By making the curvature of the convex portions uniform, the light reflection state can be made uniform, and the color of the overall appearance of the resin molded product can be unified.

[0029] By forming the surface of the resin molded product in this shape, it is possible to realize a structure with a luxurious appearance that has a deep black color with reduced gloss, without using paint.

[0030] (Resin molded product) Fig. 4(a) is a schematic perspective view showing an example of a mold for molding a resin molded product according to an embodiment, and Fig. 4(b) is a schematic perspective view showing an example of a resin molded product according to an embodiment. A structure is formed on a surface region 42 of a mold 41 for a resin molded product, and the structure of the mold surface can be transferred to a resin material, for example, to form a desired appearance structure. By transferring the surface region 42 of such a mold 41 to the surface of a resin material, a resin molded product 43 with a desired appearance structure can be obtained.

[0031] The transfer molding of the mold surface can be performed by any transfer method, such as injection molding, roll molding, or press molding. In the example shown in Figure 4, the resin molded product 43 is shown as a rectangular, flat plate. However, it can also be formed into a curved or curved original shape from a thin, flat plate such as a sheet or film. For example, thermoplastic materials such as polyethylene, polystyrene, polypropylene, polyvinyl chloride, polyester, polyamide, and polycarbonate can be used as the resin material for the resin molded product 43. Furthermore, as long as the resin material for the resin part is opaque, high-strength resins containing glass filler or carbon filler, or conductive resins, can also be used.

[0032] (Method of manufacturing mold) Next, an example of a method for manufacturing a mold used in manufacturing the resin molded product of this embodiment will be described.

[0033] The mold material can be, for example, stainless steel, aluminum, or any other material suitable for transferring a fine shape to a resin with good reproducibility. In this embodiment, a metallic mold is described, but the mold need not be made of metal as long as the fine shape can be transferred to the resin with good reproducibility. A recess (reverse mold) is formed on the molding surface of the mold to form a textured surface that reproduces the above-mentioned black color by transferring it to the resin molded product. In principle, such a recess can be formed by cutting, blasting, etching, or the like, but laser processing is particularly suitable for forming fine recesses with high precision in a short time.

[0034] 5 is a diagram illustrating a method for manufacturing a mold according to an embodiment using a laser processing machine. The laser processing machine 51 includes a laser head 53 capable of emitting a processing laser beam 52 and a processing stage 55 on which a mold block 54, which is the workpiece, can be placed. The relative positions of the laser head 53 and the mold block 54 can be changed by an X-axis movement mechanism, a Y-axis movement mechanism, and a Z-axis movement mechanism, and the processing laser beam 52 can be irradiated at any position on the mold block 54.

[0035] The laser light emitted from the laser head 53 is converged by an optical system (not shown) and collected at a predetermined focal position. Therefore, when irradiating the processing area with laser light, the movement mechanisms for each axis are driven so that the laser head 53 and the irradiated point are always maintained at a distance equal to the focal length. Furthermore, as a method for reducing the irradiation energy density in order to control the processing shape (e.g., the curvature and depth of the recess), laser irradiation may be performed while maintaining a defocused state shifted by a certain distance from the focal length.

[0036] The laser head has a built-in two-axis galvanometer scanner and an fθ lens, and by driving the galvanometer mirror, the irradiation position can be scanned at high speed. Since scanning with a galvanometer mirror can be performed faster than driving the stage, controlling the irradiation position by not only moving the stage but also using scanning with the galvanometer mirror in combination is advantageous in terms of reducing processing time.

[0037] The laser light source for laser processing can be either a CW laser that performs continuous irradiation or a pulsed laser that repeats irradiation in a short period of time. In this embodiment, a laser light source with a nanosecond pulse width is preferably used. It is desirable to use a laser light source that allows arbitrary selection of conditions such as laser irradiation intensity, pulse length, and pulse interval. For example, a nanosecond pulsed laser manufactured by AMPLITUDE SYSTEMS can be used as the laser oscillator. In this embodiment, the wavelength of the processing laser generated by the nanosecond pulsed laser oscillator is 1030 nm, the pulse width is 30 nanoseconds, and the average output is 15 W.

[0038] By using such a laser processing machine, setting irradiation conditions according to the shape, and irradiating the laser while scanning the desired area of ​​the mold surface, it is possible to form a large number of recesses on the mold surface.

[0039] (Method of manufacturing resin molded products) Next, a method for producing a resin molded product having a resin surface with a deep black color while suppressing glossiness using a mold prepared by the above-mentioned method will be described. Figures 7(a) to 7(e) are schematic diagrams for explaining the manufacturing process when producing a resin molded product according to the embodiment using an injection molding machine.

[0040] Figure 6(a) is a schematic diagram showing the setup of an injection molding machine, with 61 and 62 being molds, 63 being a cylindrical cylinder for injecting resin into the mold, and 64 being a part called a hopper for pouring the resin material into the cylinder 63. In this embodiment, black-colored polycarbonate containing approximately 30% glass filler from Teijin Limited is added as a colorant for the resin material. This gives the resin material its black color.

[0041] There is a screw (not shown) inside the cylinder 63, which is rotated by a motor 65 to send the resin material to the tip of the cylinder 63. The cylinder 63 is also equipped with a heater (not shown), and the solid resin material fed from the hopper 64 is heated to a temperature above the melting point on the way to the tip of the cylinder, melting it and storing it in the space at the tip of the cylinder 63.

[0042] Next, the mold clamping process shown in Figure 6(b) is performed. Molds 61 and 62 are aligned by a movable mechanism (not shown) and closed to form a cavity. Molds 61 and 62 are heated by a heater (not shown). Generally, a flow path for flowing high-temperature liquid is formed inside the mold, and the temperature of the mold is adjusted by controlling the flow rate and temperature of the liquid. The heating temperature of the mold in this process is called the mold temperature.

[0043] Next, the injection process shown in Figure 6(c) is carried out. The nozzle at the tip of cylinder 63 is pressed against an injection hole provided in mold 62. Then, motor 65 is operated to rotate a screw (not shown), thereby injecting molten resin 66 into the cavity formed by molds 61 and 62. The temperature of the molten resin in this process is called the resin temperature.

[0044] Next, the pressure holding process and cooling process shown in Figure 6(d) are carried out. In the pressure holding process, the pressure applied to the molten resin 66 injected into the cavity is maintained at a predetermined level by controlling the hydraulic pressure inside the cylinder 63. This predetermined pressure is called the holding pressure. The holding pressure is selected to ensure that the molten resin 66 reaches every corner of the space inside the cavity.

[0045] In the cooling process following the pressure holding process, the molds 61 and 62 are cooled by a cooling mechanism (not shown) while remaining in the arrangement shown in Fig. 6(d), and the resin inside the cavities is cooled to a temperature below the glass transition point and solidified. As the cooling mechanism, for example, a system in which a refrigerant flow path is arranged around the molds and the refrigerant is circulated to cool the molds can be used.

[0046] Once the resin in the cavity has solidified, the mold opening and demolding steps shown in Fig. 6(e) are carried out. First, in the mold opening step, a drive mechanism (not shown) moves mold 61 and / or mold 62 to separate them.

[0047] In the subsequent demolding step, the resin molded product 67 adhering to one mold is peeled off and removed from the mold by, for example, protruding an ejector pin (not shown). If necessary, gate marks (burrs left at the injection gate position) formed on the removed resin molded product 67 may be removed.

[0048] A resin molded product can be obtained by the manufacturing method described above.

[0049] (Evaluation method) Next, a method for evaluating the manufactured resin molded product will be described.

[0050] The BRDF value of the molded product was measured using a three-dimensional goniospectrophotometric colorimeter GCMS11 manufactured by Murakami Color Research Institute Co., Ltd. The height of the convex parts of the molded product was measured using a Keyence VK-X series shape analysis laser microscope.

[0051] Example 1 In this example, a mold created by the mold manufacturing method described above was used to create a resin molded product using the resin molded product manufacturing method described above, and the height of the convex portion and the BRDF value were measured using the evaluation method described above.

[0052] Figure 7(a) shows data for a resin molded product measured using a three-dimensional goniospectrophotometric colorimetry system GCMS11. The X axis represents the reflection angle, and the Y axis represents the luminance. The measurement results showed that the peak luminance 72 was 87.8 cd / m2, and the average luminance 73 at a reflection angle between -30° and 0° was 11.5 cd / m2.

[0053] Figure 7(b) shows monochrome image data of height information measured on a resin molded product using a 20x microscope lens on a VK-X series laser microscope. The white parts represent the higher parts of the molded product's shape, and the black parts represent the lower parts. The surface was analyzed using the software provided with the Keyence laser microscope, and the arithmetic mean height Sa was found to be 2.5 μm.

[0054] Figure 8 is a cross-sectional view of the resin molded product created in this example. Profile height information can be obtained using the software provided with a Keyence laser microscope. The height 125 of the lowest convex portion was 3 μm, and the height 123 of the highest convex portion was 9.5 μm. In Figure 8, dashed line 121 indicates the lowest point, dashed line 122 corresponds to the highest convex portion relative to dashed line 121, and height 123 indicates the height of the highest convex portion. Dashed line 124 indicates the lowest convex portion, and height 125 indicates the height of the lowest convex portion.

[0055] Figure 9(a) shows an image of the surface of the resin molded product produced in this example, which was observed with a laser microscope. The vertex information of the convex parts was extracted from the data and converted into points. The vertices were extracted using software attached to the laser microscope manufactured by Keyence Corporation, and the average spacing was calculated to be 30 μm.

[0056] Figure 9(b) shows the surface of the resin molded product produced in this example, as observed with a laser microscope. Figure 9(b) shows data measured with a 200x microscope lens on a VK-X series laser microscope. High-frequency components were extracted using software included with the Keyence laser microscope. The arithmetic weapon height Sa of the high-frequency components was calculated to be 0.015 μm.

[0057] When the resin molded product prepared in Example 1 was visually observed, it was found to have a deep black color with a subdued gloss, and to have a luxurious finish that was comparable to painted products painted with lacquer or multiple layers of paint.

[0058] [Other embodiments] The present invention is not limited to the above-described embodiments, and many modifications and combinations are possible within the technical concept of the present invention.

[0059] For example, the uneven structure can be formed on the resin surface by various transfer molding methods, not limited to the injection molding method described above, in which the shape of a mold surface is transferred to a resin material. For example, the uneven structure can be formed on the resin surface by an appropriate transfer method such as roll molding or press molding.

[0060] Furthermore, the resin molded product according to the embodiment is not limited to the example shown in Fig. 4. According to the present invention, it is possible to impart a luxurious color to resin molded products having various shapes and functions.

[0061] For example, a luxurious color can be imparted to the surfaces of the exterior parts 151 of the camera body and the exterior parts 152 of the lens barrel of the camera shown in FIG. 10(a). Alternatively, a luxurious color can be imparted to the surfaces of the exterior part 161 of the top panel and the exterior parts 12 of the side of the printer shown in FIG. 10(b). The camera is not limited to the example shown in FIG. 10(a) and may be an interchangeable lens single-lens reflex camera, a mirrorless camera, a compact camera, or a smartphone with a photography function. The printer is not limited to the example shown in FIG. 10(b) and may be applied to various forms such as a dedicated printer, a copier, or a multifunction printer with a reading function, and the recording method is not particularly limited, including electrophotographic, inkjet, and thermal transfer.

[0062] Furthermore, the present invention can be applied not only to flat surfaces but also to surfaces that have been subjected to a surface treatment (knurling) to enhance grip. In such cases, the shape of the concave-convex structure of the resin molded product according to the present invention must be designed to satisfy the above-mentioned conditions, excluding the knurling. That is, when a resin molded product is to be provided on the surface of a member having knurling-processed concave-convex surfaces of approximately 1 mm, the knurling-processed concave-convex surfaces of approximately 1 mm are used as the reference surface. The same effect can be achieved by providing the height of the multiple convex portions of the resin molded product provided on the reference surface to be 2 μm or more and 15 μm or less, and by providing the arithmetic mean height Sa of the high-frequency components in the predetermined region to be 12 nm or more and 20 nm or less.

[0063] Furthermore, the present invention is not limited to resin molded products such as cameras and printers, but can also be applied to any resin molded product for which it is desired to present a luxurious color to the observer, such as interior parts of automobiles or outer boxes for cosmetics. The resin molded product may be in the form of a thin flat plate such as a sheet or film, or may have a three-dimensional shape with a curved surface, or may be flexible.

[0064] The resin material used for the resin molded product may preferably be a thermoplastic resin such as polyethylene, polystyrene, polypropylene, polyvinyl chloride, polyester, polyamide, polycarbonate, etc. However, it is not limited to these. It may also be a high-strength resin containing glass filler or carbon filler, or a functional resin such as a conductive resin.

[0065] In this embodiment, a resin molded product formed using a resin material colored black to achieve depth of color has been described, but the present invention is not limited to black, and color depth can be achieved using similar techniques with colors other than black. Any color can be achieved by adding an appropriate pigment or the like to the resin material.

[0066] <Summary of the embodiment> The disclosure of the present specification includes at least the following configurations.

[0067] (Item 1) A resin molded product having a plurality of convex portions in a predetermined area, The height of the plurality of protrusions is 2 μm or more and 15 μm or less, A resin molded product characterized in that the arithmetic mean height Sa of the high frequency components in the predetermined region is 12 nm or more and 20 nm or less.

[0068] (Item 2) The resin molded product described in item 1, characterized in that the arithmetic mean height of the high-frequency components is the arithmetic mean height in a profile obtained by removing height information of 1 μm or more from height information of multiple convex portions.

[0069] (Item 3) 3. The resin molded product according to item 1 or 2, characterized in that the resin molded product is made of a black resin material.

[0070] (Item 4) The resin molded product according to any one of items 1 to 3, characterized in that the BRDF measurement value of the specified area has a peak luminance of 62 to 112 cd / m2 and an average luminance of 10 cd / m2 to 19 cd / m2 at a reflection angle of -30° to 0°.

[0071] (Item 5) 5. The resin molded product according to any one of items 1 to 4, wherein the average interval between the plurality of convex portions is 20 μm or more and 60 μm or less.

[0072] (Item 6) 6. The resin molded product according to any one of items 1 to 5, wherein the arithmetic mean height Sa of the predetermined region is 2.0 μm or more and 3.0 μm or less.

[0073] (Item 7) 7. The resin molded product according to any one of items 1 to 6, wherein the curvatures of the plurality of convex portions are substantially the same.

[0074] (Item 8) The resin molded product described in any one of items 1 to 7 is characterized in that the resin molded product is formed on the surface of a member having an uneven structure.

[0075] (Item 9) A mold having a molding surface including a plurality of recesses for molding the plurality of protrusions of the resin molded product according to any one of items 1 to 8.

[0076] (Item 10) The resin molded product according to any one of items 1 to 8 is formed by a transfer molding method using a mold. A method for producing a resin molded product, comprising:

[0077] (Item 11) The resin molded product according to any one of items 1 to 8 is provided. A camera characterized by:

[0078] (Item 12) The resin molded product according to any one of items 1 to 8 is provided. A printer characterized by:

Claims

1. A resin molded product having a plurality of protrusions in a predetermined area, The height of the plurality of protrusions is 2 μm or more and 15 μm or less, A resin molded product, characterized in that the arithmetic mean height Sa of the high frequency components in the predetermined region is 12 nm or more and 20 nm or less.

2. 2. The resin molded product according to claim 1, wherein the arithmetic mean height of the high frequency components is the arithmetic mean height in a profile obtained by removing height information of 1 μm or more from height information of a plurality of convex portions.

3. 2. The resin molded product according to claim 1, wherein the resin molded product is made of a black resin material.

4. The BRDF measurement value of the predetermined area has a peak luminance of 62 to 112 cd / m2 and an average luminance of 10 cd / m2 to 19 cd / m2 at a reflection angle of -30° to 0°. The resin molded product according to claim 1, wherein the peak luminance is 62 to 112 cd / m2 and an average luminance of 10 cd / m2 to 19 cd / m2 at a reflection angle of -30° to 0°.

5. 2. The resin molded product according to claim 1, wherein an average interval between the plurality of protrusions is 20 μm or more and 60 μm or less.

6. 2. The resin molded product according to claim 1, wherein the arithmetic mean height Sa of the predetermined region is 2.0 μm or more and 3.0 μm or less.

7. 2. The resin molded product according to claim 1, wherein the curvatures of the plurality of convex portions are substantially the same.

8. 2. The resin molded product according to claim 1, wherein the resin molded product is formed on a surface of a member having an uneven structure.

9. A mold, comprising a molding surface having a plurality of recesses for molding the plurality of protrusions provided on the resin molded product according to any one of claims 1 to 8.

10. The resin molded product according to any one of claims 1 to 8 is formed by a transfer molding method using a mold. A method for producing a resin molded product, comprising:

11. A resin molded product according to any one of claims 1 to 8, A camera characterized by:

12. A resin molded product according to any one of claims 1 to 8, A printer characterized by:

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