Light shielding member

Abstract

A light shielding member (1) is provided with: a metal core layer (2); and a low reflection layer (4) covering the core layer (2). The light shielding member (1) has: a first main surface (11); a second main surface (12) disposed on the other side in the thickness direction of the first main surface (11) so as to face the first main surface (11) with a gap therebetween; an outer peripheral surface (13) that is continuous with the peripheral edge of the first main surface (11) and the peripheral edge of the second main surface (12) and has a tapered shape in which the area in the plane direction orthogonal to the thickness direction decreases from the first main surface (11) toward the second main surface (12); and a through hole (14) penetrating in the thickness direction. The through hole (14) has an inner peripheral surface (15). The first main surface (11) is the outer surface of the low reflection layer (4). The second main surface (12) is an outer surface of the low reflection layer (4). And the 5-degree specular reflectance of the low-reflection layer (4) is lower than that of the core layer (2).

Description

Technical Field

[0001] This invention relates to light-shielding components. Background Technology

[0002] Previously, as a light-shielding component, there are known light-shielding components that have an optical multilayer film on the surface of a substrate (for example, see Patent Document 1 below).

[0003] The substrate contains resin. The optical multilayer film consists of a light-absorbing layer and a dielectric layer. The light-absorbing layer and the dielectric layer contain metal or metal oxide.

[0004] Existing technical documents Patent documents Patent Document 1: International Publication Publication No. 2021 / 193652 Summary of the Invention

[0005] The problem that the invention aims to solve In Patent Document 1, most of the light incident on the light-shielding member is absorbed by the light-absorbing layer, while on the other hand, there is a case where a portion of the incident light is reflected.

[0006] However, in the light-shielding member of Patent Document 1, when viewed in cross-section along the thickness direction, the upper surface of the light-shielding member is orthogonal to the side surface of the light-shielding member. Therefore, depending on the angle of light incidence, there is an undesirable situation where light reflected from the side surface of the light-shielding member can intrude into the object being shielded.

[0007] The present invention provides a light-shielding component that suppresses light intrusion into the object to be shaded by reflection.

[0008] Technical solutions for solving the problem The present invention [1] is a light-shielding member comprising: a metal core layer; and a low-reflection layer covering the core layer, the light-shielding member having: a first main surface; a second main surface disposed opposite to the first main surface at a distance from the first main surface on the other side of the thickness direction; an outer peripheral surface continuous with the peripheral edge of the first main surface and the peripheral edge of the second main surface, and having a tapered shape in which the area in the surface direction orthogonal to the thickness direction decreases from the first main surface toward the second main surface; and a through hole extending through in the thickness direction, the through hole having an inner peripheral surface, the first main surface being the outer surface of the low-reflection layer, the second main surface being the outer surface of the low-reflection layer, and the 5° specular reflectance of the low-reflection layer being lower than the 5° specular reflectance of the core layer.

[0009] With this structure, the first and second main surfaces of the light-shielding member are the outer surfaces of the low-reflection layer. Therefore, light reflection can be suppressed.

[0010] In addition, the outer peripheral surface of the light-shielding member has a conical shape. Therefore, even when light is incident on the outer peripheral surface of the light-shielding member and reflected, the reflected light can be suppressed from entering the object to be shaded.

[0011] In addition, the rigidity can be improved by using a metal core layer.

[0012] The present invention [2] includes the light-shielding member according to claim 1, wherein the outer peripheral surface is the outer surface of the low-reflection layer and the inner peripheral surface is the outer surface of the low-reflection layer.

[0013] With this structure, the outer and inner peripheral surfaces of the light-shielding member are the outer surfaces of the low-reflection layer. Therefore, light reflection can be suppressed.

[0014] The present invention [3] includes the light-shielding member described in [2] above, wherein the core layer has: a first main surface of the core; a second main surface of the core, which is disposed opposite to the first main surface of the core on the other side of the thickness direction of the first main surface of the core at a distance from the first main surface of the core; an outer peripheral surface of the core, which is continuous with the peripheral edge of the first main surface of the core and the peripheral edge of the second main surface of the core; and a through hole of the core, which, when viewed from the thickness direction, includes the through hole and penetrates in the thickness direction, wherein the length between the outer peripheral surface and the outer peripheral surface of the core is longer than the length between the inner peripheral surface and the inner peripheral surface of the core.

[0015] With this structure, the durability of the outer periphery of the light-shielding component can be further improved.

[0016] The present invention [4] includes any one of [1] to [3] above, wherein, when viewed in cross-section along the thickness direction, the angle between the first main surface and the outer peripheral surface is 15° or more and 70° or less.

[0017] With this structure, it is possible to further suppress the intrusion of light reflected from the outer peripheral surface of the light-shielding member into the light-shielding object.

[0018] The present invention [5] includes a light-shielding member as described in any one of [1] to [4] above, wherein the light-shielding member further comprises a resin layer disposed between the core layer and the low-reflection layer, the core layer having: a first core main surface; a second core main surface disposed opposite to the first core main surface at a distance from the first core main surface on the other side of the thickness direction; an outer peripheral surface of the core continuous with the peripheral edge of the first core main surface and the peripheral edge of the second core main surface; and a core through hole, which, when viewed from the thickness direction, includes the through hole and penetrates in the thickness direction, the core through hole having an inner peripheral surface, the resin layer having: a first resin main surface covering the first core main surface and being covered by the first main surface; and a second resin main surface disposed opposite to the first resin main surface at a distance from the first resin main surface on the other side of the thickness direction, covering the second core main surface and being covered by the second main surface.

[0019] Based on this structure, the durability can be improved through the resin layer.

[0020] The present invention [6] includes the light-shielding member described above [5], wherein the resin layer further comprises: a resin outer peripheral surface that is continuous with the peripheral edge of the first resin main surface and the peripheral edge of the second resin main surface, covers the core outer peripheral surface, and is covered by the outer peripheral surface; and a resin through hole that, when viewed from the thickness direction, includes the through hole and is included in the core through hole, and extends through the thickness direction, the resin through hole having a resin inner peripheral surface.

[0021] Based on this structure, the durability can be improved through the resin layer.

[0022] The present invention [7] includes the light-shielding member described above [6], wherein the inner circumference of the resin covers the inner circumference of the core and is covered by the inner circumference, and the length between the outer circumference of the resin and the outer circumference of the core is longer than the length between the inner circumference of the resin and the inner circumference of the core.

[0023] With this structure, the durability of the outer periphery of the light-shielding component can be further improved.

[0024] The present invention [8] includes the light-shielding member described above [6], wherein the light-shielding member further comprises a cylindrical portion protruding from the core layer in the thickness direction and having an inner peripheral surface continuous from the inner peripheral surface of the core, the inner peripheral surface of the core being covered by the low-reflection layer, and the inner peripheral surface of the cylindrical portion being covered by the low-reflection layer.

[0025] This structure can improve the strength around the through-hole of the light-shielding component.

[0026] The present invention [9] includes the light-shielding member described above [1], wherein the inner peripheral surface comprises the outer surface of the core layer.

[0027] This structure can improve the strength around the through-hole of the light-shielding component.

[0028] Invention Effects According to the light-shielding member of the present invention, light intrusion into the light-shielding object can be suppressed by reflection. Attached Figure Description

[0029] Figure 1 This is a top view of the light-shielding member as a first embodiment of the present invention.

[0030] Figure 2 yes Figure 1 The AA section view of the light-shielding component shown.

[0031] Figure 3 express Figure 1 One embodiment of the manufacturing method of the light-shielding component shown. Figure 3 (A) indicates the first step in preparing the resin layer. Figure 3 (B) indicates the process of forming a seed layer on one side of the resin layer in the thickness direction during the second process. Figure 3 (C) indicates the process of configuring the core layer on one side of the seed layer in the thickness direction in the second process. Figure 3 (D) indicates the third process of coating the core layer with a resin layer. Figure 3 (E) indicates the process of coating the resin layer with a metal layer in the fourth process. Figure 3 (F) indicates the process of coating the resin layer with a low-reflection layer through a metal layer in the fourth process.

[0032] Figure 4 Yes Figure 1 The diagram illustrates the function and effect of the light-shielding component shown. Figure 4 (A) is an explanatory diagram illustrating the light L reflected from the outer peripheral surface of the light-shielding member when the outer peripheral surface of the light-shielding member does not have a conical shape. Figure 4 (B) is an explanatory diagram illustrating the light L reflected from the outer peripheral surface of the light-shielding member when the outer peripheral surface of the light-shielding member has a conical shape.

[0033] Figure 5 This is a cross-sectional view of the light-shielding member as a second embodiment of the present invention.

[0034] Figure 6 express Figure 1 A variation of the manufacturing method of the light-shielding component shown. Figure 6 (A) indicates the process of preparing a substrate made of the core layer material in the first process. Figure 6 (B) indicates the process of preparing the core layer by etching away the substrate in the first process. Figure 6 (C) indicates the sixth process of coating the core layer with a resin layer. Figure 6 (D) indicates the seventh step of using a low-reflection layer to coat the resin layer.

[0035] Figure 7 This is a top view of a modified example of the light-shielding member of the present invention (a light-shielding member having a guide groove).

[0036] Figure 8 This illustrates a modified example of the light-shielding member of the present invention (a light-shielding member with a conical through hole). Figure 8 (A) represents a light-shielding member in which the through hole is a tapered hole whose area expands from the first main surface toward the second main surface in a plane direction orthogonal to the thickness direction. Figure 8 (B) represents a light-shielding member in which the through hole is a tapered hole with an area that decreases from the first main surface toward the second main surface in a direction orthogonal to the thickness direction.

[0037] Figure 9 This illustrates a modified example of the light-shielding member of the present invention (a light-shielding member having a parabolic cone shape on its outer peripheral surface). Figure 9 (A) represents a parabolic cone shape, which is a light-shielding member with a central arc shape on the inner circumferential side of the light-shielding member. Figure 9 (B) represents a parabolic cone shape, which is a light-shielding member with a central arc shape on the outer peripheral surface of the light-shielding member.

[0038] Figure 10 This illustrates a modified example of the light-shielding member of the present invention (a light-shielding member in which the inner peripheral surface 15 includes the outer surface of the core layer 2). Detailed Implementation

[0039] 1. First Implementation Method Reference Figure 1 as well as Figure 2 The first embodiment of the light-shielding member of the present invention will be described.

[0040] like Figure 1 As shown, the light-shielding member 1 has a generally elliptical shape when viewed from above. Additionally, as... Figure 2 As shown, it has a roughly trapezoidal shape in side view, with the width narrowing from one side of the thickness direction to the other side of the thickness direction.

[0041] like Figure 2 As shown, the light-shielding member 1 has a first main surface 11, a second main surface 12, an outer peripheral surface 13, and a through hole 14.

[0042] The first principal surface 11 is a flat surface.

[0043] The second main surface 12 is disposed opposite the first main surface 11 on the other side of the first main surface 11 in the thickness direction, spaced apart from it. The second main surface 12 is parallel to the first main surface 11. The second main surface 12 is a flat surface.

[0044] It should be noted that a flat surface refers to a surface that appears flat, such as allowing for minute bumps and undulations of less than 15 μm (the same applies below).

[0045] The outer peripheral surface 13 is continuous with the peripheral edges of the first main surface 11 and the second main surface 12. The outer peripheral surface 13 has a conical shape in which the area in the surface direction orthogonal to the thickness direction decreases from the first main surface 11 toward the second main surface 12. More specifically, the outer peripheral surface 13 has a conical shape in which the area in the surface direction changes linearly with respect to the thickness direction (linear conical shape). The outer peripheral surface 13 is a flat surface.

[0046] When viewed in cross-section along the thickness direction, the angle α formed by the first principal surface 11 and the outer peripheral surface 13 is an acute angle. The angle α is, for example, 15° to 70°, and preferably 25° to 60°.

[0047] If the angle α is within the above range, it is possible to further suppress the intrusion of light reflected from the outer peripheral surface 13 of the light-shielding member 1 into the light-shielding object (described later).

[0048] It should be noted that angle α is calculated based on the contour of the outer peripheral surface 13 obtained using a laser microscope. Specifically, firstly, the slope (slope function) of the straight line connecting the outer peripheral edge of the second principal surface 12 to the inner peripheral edge of the second principal surface 12 is calculated, and then converted into an angle (first angle) using the arctangent. Next, the slope (slope function) of the straight line connecting the peripheral edge of the first principal surface 11 to the peripheral edge of the second principal surface 12 is calculated, and then converted into an angle (second angle) using the arctangent. Finally, based on the second angle, the first angle is corrected, and angle α is calculated.

[0049] Furthermore, when viewed in cross-section along the thickness direction, the angle β formed by the second main surface 12 and the outer peripheral surface 13 is an obtuse angle. The angle β is, for example, 110° to 165°, and preferably 120° to 155°.

[0050] It should be noted that the sum of angle α and angle β is 180°.

[0051] The through hole 14 extends through the thickness of the light-shielding member 1. By inserting a fixing member (not shown) through the through hole 14, the light-shielding member 1 can be rotated about the fixing member as a central axis. By rotating the light-shielding member 1, a light-shielding posture or a light-entry posture can be adopted relative to the light-shielding object (described later).

[0052] The through hole 14 has an inner circumferential surface 15.

[0053] The through hole 14 is a circular hole. If the through hole 14 is a circular hole, the rotational flexibility can be improved. The inner diameter of the through hole 14 is, for example, 50 μm to 1000 μm, preferably 100 μm to 500 μm.

[0054] Furthermore, the first main surface 11, the second main surface 12, the outer peripheral surface 13, and the inner peripheral surface 15 are the outer surfaces of the low-reflection layer 4, which will be described later. That is, all surfaces of the light-shielding member 1 are the outer surfaces of the low-reflection layer 4.

[0055] The light-blocking component 1 at least blocks visible light.

[0056] The visible light transmittance (JIS 7375) of the light-shielding member 1 in the thickness direction is, for example, 1.0% or less, preferably 0.01% or less, and more preferably 0%.

[0057] The visible light specular reflectance of the first main surface 11, the second main surface 12, the outer peripheral surface 13, and the inner peripheral surface 15 of the light-shielding member 1 at 5° is, for example, 1.0% or less, preferably 0.5% or less, and also, for example, 0% or more.

[0058] It should be noted that the above-mentioned specular reflectance is determined by the average reflectance of visible light with wavelengths of 500nm to 600nm.

[0059] The flexural modulus of light-shielding member 1 (JIS 7171) is, for example, 10 GPa to 250 GPa, preferably 50 GPa to 200 GPa.

[0060] The thickness T of the light-shielding member 1 is, for example, 10 μm to 150 μm, preferably 20 μm to 100 μm, and more preferably 30 μm to 90 μm.

[0061] In detail, the thickness T of the light-shielding member 1 is, for example, 10 μm or more, preferably 20 μm or more, more preferably 30 μm or more, and also, for example, 150 μm or less, preferably 100 μm or less, more preferably 90 μm or less.

[0062] The length of the major axis of the light-shielding member 1 is, for example, 1 mm to 30 mm, preferably 3 mm to 10 mm.

[0063] The length of the short axis of the light-shielding member 1 is, for example, 0.5 mm to 15 mm, preferably 1 mm to 7 mm.

[0064] The light-shielding component 1 has a core layer 2, a resin layer 3, and a low-reflection layer 4.

[0065] <Core Layer> The core layer 2 is disposed approximately at the center of the light-shielding member 1 in the thickness direction. The core layer 2 extends in an orthogonal direction. The core layer 2 has a flat plate shape that is rectangular when viewed from above.

[0066] The core layer 2 has a first main surface 21, a second main surface 22, an outer peripheral surface 23, and a through hole 24.

[0067] The first main surface 21 of the core is a flat surface.

[0068] The second main surface 22 of the core is disposed opposite to the first main surface 21 on the other side of the core in the thickness direction, spaced apart from it. The second main surface 22 of the core is parallel to the first main surface 21 of the core. The second main surface 22 of the core is a flat surface.

[0069] The outer peripheral surface 23 of the core is continuous with the peripheral edge of the first main surface 21 of the core and the peripheral edge of the second main surface 22 of the core. The outer peripheral surface 23 of the core is a flat surface.

[0070] When viewed from the thickness direction of the light-shielding member 1, the core through-hole 24 includes the through-hole 14 and the resin through-hole 34 (described later), and extends through the member in the thickness direction. The core through-hole 24 has a similar shape to the through-hole 14.

[0071] The core through hole 24 has a core inner circumferential surface 25.

[0072] The inner diameter of the core through hole 24 is, for example, 50 μm to 1000 μm, preferably 100 μm to 500 μm.

[0073] The ratio of the inner diameter of the through hole 14 to the inner diameter of the core through hole 24 is, for example, 0.5 to 1.0, preferably 0.8 to 1.0.

[0074] The thickness T1 of the core layer 2 is, for example, 5 μm to 70 μm, preferably 10 μm to 30 μm.

[0075] In detail, from the viewpoint of improving rigidity, the thickness T1 of the core layer 2 is, for example, 5 μm or more, preferably 10 μm or more, and also, for example, 70 μm or less, preferably 30 μm or less.

[0076] When the thickness T of the light-shielding member 1 is set to 100%, the thickness T1 of the core layer 2 is, for example, 10% to 50%, preferably 15% to 40%.

[0077] In detail, when the thickness T of the light-shielding member 1 is set to 100%, from the viewpoint of improving rigidity, the thickness T1 of the core layer 2 is, for example, 10% or more, preferably 15% or more, and also, for example, 50% or less, preferably 40% or less.

[0078] The core layer 2 is made of metal. Examples of materials suitable for the core layer 2 include copper, copper alloys, stainless steel, aluminum, titanium, nickel, tantalum, and magnesium. Copper and stainless steel are preferred materials for the core layer 2.

[0079] The visible light specular reflectance of core layer 2 at 5° is, for example, 10% to 80%.

[0080] <Resin Layer> A resin layer 3 is disposed between the core layer 2 and the low-reflection layer 4. The resin layer 3 covers the core layer 2. The resin layer 3 covers the first main surface 21, the second main surface 22, the outer peripheral surface 23, and the inner peripheral surface 25 of the core. The resin layer 3 improves durability.

[0081] The resin layer 3 has a first resin main surface 31, a second resin main surface 32, a resin outer peripheral surface 33, and a resin through hole 34.

[0082] The first main surface 31 of the resin is a flat surface. The first main surface 31 of the resin covers the first main surface 21 of the core.

[0083] The second resin main surface 32 is disposed opposite the first resin main surface 31 on the other side of its thickness direction, spaced apart from it. The second resin main surface 32 is parallel to the first resin main surface 31. The second resin main surface 32 is a flat surface. The second resin main surface 32 covers the second core main surface 22.

[0084] The resin outer peripheral surface 33 is continuous with the peripheral edge of the resin first main surface 31 and the peripheral edge of the resin second main surface 32. The resin outer peripheral surface 33 has a similar shape to the outer peripheral surface 13. The resin outer peripheral surface 33 covers the core outer peripheral surface 23.

[0085] When viewed from the thickness direction of the light-shielding member 1, the resin through-hole 34 includes the through-hole 14 and is contained within the core through-hole 24, and extends through in the thickness direction. The resin through-hole 34 has a similar shape to the through-hole 14.

[0086] The resin through hole 34 has a resin inner circumferential surface 35. The resin inner circumferential surface 35 covers the core inner circumferential surface 25.

[0087] The thickness T2 of the resin layer 3 is, for example, 3 μm to 50 μm, preferably 5 μm to 20 μm.

[0088] In detail, from the viewpoint of improving durability, the thickness T2 of the resin layer 3 is, for example, 3 μm or more, preferably 5 μm or more, and also, for example, 500 μm or less, preferably 20 μm or less.

[0089] The thickness T2 of the resin layer 3 is thinner than the thickness T1 of the core layer 2. When the thickness T1 of the core layer 2 is set to 100%, the thickness T2 of the resin layer 3 is, for example, 40% to 90%, preferably 50% to 70%.

[0090] When the thickness T of the light-shielding member 1 is set to 100%, the thickness T2 of the resin layer 3 is, for example, 5% to 40%, preferably 10% to 30%.

[0091] In detail, when the thickness T of the light-shielding member 1 is set to 100%, from the viewpoint of improving durability, the thickness T2 of the resin layer 3 is, for example, 5% or more, preferably 10% or more, and also, for example, 40% or less, preferably 30% or less.

[0092] Resins can be used as the material for resin layer 3. Examples of resins include acrylic resins, epoxy resins, polyimides (e.g., photosensitive polyimides), and silicone resins. Polyimides are preferred as resins. That is, it is preferable that resin layer 3 contains polyimide. If resin layer 3 contains polyimide, it has excellent dimensional accuracy.

[0093] The visible light specular reflectance of resin layer 3 at 5° is, for example, 5% to 20%.

[0094] <Low-reflection layer> The low-reflection layer 4 covers the core layer 2 and the resin layer 3. Specifically, the low-reflection layer 4 covers the first resin main surface 31, the second resin main surface 32, the outer resin peripheral surface 33, and the inner resin peripheral surface 35.

[0095] In detail, as described above, the light-shielding member 1 has a first main surface 11, a second main surface 12, an outer peripheral surface 13, and a through hole 14 having an inner peripheral surface 15. That is, the low-reflection layer 4 has a first main surface 11, a second main surface 12, an outer peripheral surface 13, and an inner peripheral surface 15. The first main surface 11 is covered with a resin first main surface 31. The second main surface 12 is covered with a resin second main surface 32. The outer peripheral surface 13 is covered with a resin outer peripheral surface 33. The inner peripheral surface 15 is covered with a resin inner peripheral surface 35.

[0096] The 5° specular reflectance of the low-reflection layer 4 is lower than that of the core layer 2. The 5° specular reflectance of the low-reflection layer 4 is, for example, 1.0% or less, preferably 0.5% or less, and for example, 0% or more.

[0097] The thickness T3 of the low-reflection layer 4 is, for example, 0.01 μm to 30 μm, preferably 0.05 μm to 20 μm.

[0098] In detail, from the viewpoint of improving light-shielding performance, the thickness T3 of the low-reflection layer 4 is, for example, 0.01 μm or more, preferably 0.05 μm or more, for example, 30 μm or less, and preferably 20 μm or less.

[0099] When the thickness T1 of the core layer 2 is set to 100%, the thickness T3 of the low-reflection layer 4 is, for example, 0.1% to 150%, preferably 0.3% to 140%.

[0100] When the thickness T of the light-shielding member 1 is set to 100%, the thickness T3 of the low-reflection layer 4 is, for example, 0.05% to 40%, preferably 0.1% to 30%.

[0101] In detail, when the thickness T of the light-shielding member 1 is set to 100%, from the viewpoint of improving light-shielding performance, the thickness T3 of the low-reflection layer 4 is, for example, 0.05% or more, preferably 0.1% or more. In addition, from the viewpoint of lightweighting, the thickness T3 of the low-reflection layer 4 is, for example, 40% or less, preferably 30% or less.

[0102] The surface roughness Ra of the low-reflection layer 4 (arithmetic mean surface roughness according to JIS B 0601-2001) is, for example, 1.0 nm to 15000 nm, preferably 100 nm to 5000 nm.

[0103] Materials that can be used as the low-reflection layer 4 include, for example, resin compositions, metals and their oxides.

[0104] The resin composition contains resin, pigment, and filler. That is, when the material of the low-reflection layer 4 is a resin composition, the low-reflection layer 4 contains resin, pigment, and filler.

[0105] Examples of resins include acrylic resins, epoxy resins, polyimides, and polyamides. Acrylic resins are preferred as resins.

[0106] In the resin composition, the resin content is, for example, 20% to 80% by mass, preferably 30% to 70% by mass.

[0107] Examples of pigments include black pigments and gray pigments. Black pigments are preferred. Examples of black pigments include black dyes and black pigments. Examples of black dyes include carbon black and titanium-based pigments. Examples of black dyes include mixtures of dyes such as phthalocyanine blue, phthalocyanine green, monoazo yellow, diazo yellow, benzimidazolone yellow, quinacridone red, monoazo red, polyazo red, and perylene red. Black pigments are more preferred. Carbon black is even more preferred.

[0108] In the resin composition, the pigment content is, for example, 0.1% to 20% by mass, preferably 0.5% to 10% by mass.

[0109] In addition, the proportion of pigment relative to 100 parts by weight of resin is, for example, 1 to 50 parts by weight, preferably 5 to 30 parts by weight.

[0110] Examples of filler materials include acrylic microgels and silica. Acrylic microgels are preferred as filler materials.

[0111] The average particle size of the filler material is determined by laser diffraction scattering method, and is, for example, 1.0 μm or more, preferably 5.0 μm or more, and also, for example, 20.0 μm or less.

[0112] In the resin composition, the content of the filler material is, for example, 1% to 50% by mass, preferably 5% to 30% by mass.

[0113] The proportion of filler material relative to 100 parts by weight of resin is, for example, 5 to 50 parts by weight, preferably 10 to 40 parts by weight.

[0114] Furthermore, as detailed later, in the fourth process, when the low-reflection layer 4 is configured by electrodeposition coating, the low-reflection layer 4 contains the material of the metal layer M3.

[0115] Examples of metals and their oxides include titanium, nickel, chromium, niobium, and their oxides.

[0116] In the light-shielding member 1, it is preferable that the length D between the resin outer peripheral surface 33 and the core outer peripheral surface 23 is longer than the length E between the resin inner peripheral surface 35 and the core inner peripheral surface 25. Specifically, the ratio of the length D between the resin outer peripheral surface 33 and the core outer peripheral surface 23 to the length E between the resin inner peripheral surface 35 and the core inner peripheral surface 25 (length D / length E) is, for example, greater than 1, preferably 1.5 or more, and, for example, less than 50.

[0117] If the length D between the outer peripheral surface 33 of the resin and the outer peripheral surface 23 of the core is longer than the length E between the inner peripheral surface 35 of the resin and the inner peripheral surface 25 of the core, then the durability of the outer peripheral surface 13 of the light-shielding member 1 can be further improved.

[0118] Furthermore, in the light-shielding member 1, it is preferable that the length F between the outer peripheral surface 13 and the core outer peripheral surface 23 is longer than the length G between the core inner peripheral surface 25 and the inner peripheral surface 13. The ratio of the length F between the outer peripheral surface 13 and the core outer peripheral surface 23 to the length G between the core inner peripheral surface 25 and the inner peripheral surface 13 (length F / length G) is, for example, greater than 1, preferably more than 1.5, and also, for example, less than 50.

[0119] If the length F between the outer peripheral surface 13 and the outer peripheral surface 23 of the core is longer than the length G between the inner peripheral surface 25 of the core and the inner peripheral surface 13, then the durability of the outer peripheral surface 13 of the light-shielding member 1 can be further improved.

[0120] <Manufacturing Method of Light-Shielding Components> Reference Figure 3(A) to (F) describe one embodiment of the manufacturing method of the light-shielding component.

[0121] The manufacturing method of the light-shielding component 1 includes: a first step of preparing a resin layer 3; a second step of placing a core layer 2 on the other side of the resin layer 3 in the thickness direction; a third step of covering the core layer 2 with the resin layer 3; and a fourth step of covering the resin layer 3 with a low-reflection layer 4.

[0122] [First Process] In the first process, such as Figure 3 As shown in (A), resin layer 3 is prepared. Specifically, in order to prepare resin layer 3, firstly, substrate M1 is prepared.

[0123] The substrate M1 contains a metal that can be removed by etching. Examples of materials used for the substrate M1 include stainless steel.

[0124] Next, a resin layer 3 is disposed on the other side of the substrate M1 in the thickness direction. Then, if the material of the resin layer 3 is a photosensitive resin, a solution of the resin layer 3 material (varnish) is applied to the other side of the substrate M1 in the thickness direction to obtain a coating film. The coating film is then exposed and developed. Thus, a resin layer 3 is disposed on the other side of the substrate M1 in the thickness direction. Alternatively, if the material of the resin layer 3 is not a photosensitive resin (in the case of a non-photosensitive resin), the resin layer 3 is disposed by printing a solution of the resin layer 3 material (varnish).

[0125] [Second Process] In the second process, such as Figure 3 As shown in (B), a core layer 2 is disposed on the other side of the resin layer 3 in the thickness direction. Specifically, a seed layer M2 is first formed on the other side of the resin layer 3 by sputtering. Examples of materials for the seed layer M2 include chromium, copper, nickel, titanium, and alloys thereof. It should be noted that the seed layer M2 can be a single layer or multiple layers.

[0126] Next, as Figure 3 As shown in (C), firstly, a partially open resist R is disposed on the other side of the substrate M1 in the thickness direction to form the core layer 2. On the other side of the seed layer M2 exposed from the resist R in the thickness direction, the core layer 2 is disposed by electrolytic plating. According to the plating method, the core layer 2 can be reliably disposed.

[0127] [Third Process] In the third process, such as Figure 3As shown in (D), the core layer 2 is coated with resin layer 3. Specifically, the first main surface 21, the second main surface 22, the outer peripheral surface 23, and the inner peripheral surface 25 of the core are coated with resin layer 3. The method of coating the first main surface 21, the second main surface 22, the outer peripheral surface 23, and the inner peripheral surface 25 of the core with resin layer 3 is the same as the first step described above.

[0128] Subsequently, substrate M1 is removed by etching. It should be noted that... Figure 3 In (D), the core layer 2 and the seed layer M2 are integrated to form the core layer 2.

[0129] [Fourth Process] In the fourth process, such as Figure 3 As shown in (E), a low-reflection layer 4 is used to cover the resin layer 3. Specifically, the low-reflection layer 4 covers the first resin main surface 31, the second resin main surface 32, the outer resin peripheral surface 33, and the inner resin peripheral surface 35.

[0130] As a method of using a low-reflection layer 4 to cover the first main surface 31, the second main surface 32, the outer peripheral surface 33, and the inner peripheral surface 35 of the resin, examples include electrodeposition coating, physical vapor deposition, and plating (e.g., electrolytic plating).

[0131] When the material of the low-reflection layer 4 is a resin composition, electrodeposition coating is the preferred coating method described above. Furthermore, when the material of the low-reflection layer 4 is a metal or its oxide, physical vapor deposition is the preferred coating method described above.

[0132] In the electrodeposition coating method, firstly, a metal layer M3 is used to coat the resin layer 3. Specifically, the metal layer M3 coats the first main surface 31, the second main surface 32, the outer peripheral surface 33, and the inner peripheral surface 35 of the resin.

[0133] Materials that can be used as the metal layer M3 include, for example, chromium, nickel, titanium, copper, nickel-chromium, tungsten, cobalt, and their alloys.

[0134] The materials of the metal layer M3 can be used alone or in combination with two or more materials.

[0135] Methods for coating the metal layer M3 include, for example, physical vapor deposition and electroless plating.

[0136] Examples of physical vapor deposition methods include vacuum vapor deposition, sputtering, and ion plating. Sputtering is a preferred physical vapor deposition method.

[0137] The metal layer M3 has a thickness of, for example, 1 nm to 1000 nm, preferably 10 nm to 500 nm. If the thickness of the metal layer M3 is above or above the lower limit mentioned above, the adhesion between the resin layer 3 and the low-reflection layer 4 can be improved.

[0138] The metal layer M3 can also be set to a single layer or multiple layers.

[0139] Next, as Figure 3 As shown in (F), the resin layer 3 is coated with a low-reflection layer 4 through a metal layer M3 using an electrodeposition coating method. Specifically, the first main surface 31, the second main surface 32, the outer peripheral surface 33, and the inner peripheral surface 35 of the resin are coated with the low-reflection layer 4 through the metal layer M3. It should be noted that in... Figure 3 In (F), a metal layer M3 is included and shown as a low-reflection layer 4.

[0140] By following the above steps, light-shielding component 1 is manufactured.

[0141] 2. Effects In the light-shielding member 1, the first main surface 11, the second main surface 12, the outer peripheral surface 13, and the inner peripheral surface 15 are the outer surfaces of the low-reflection layer 4. Therefore, light reflection can be suppressed.

[0142] Furthermore, the outer peripheral surface 13 of the light-shielding member 1 has a conical shape. Therefore, even when light is incident on the outer peripheral surface 13 of the light-shielding member 1 and reflected, the reflected light can be suppressed from entering the light-shielding object 100.

[0143] In detail, using Figure 4 (A) and Figure 4 (B) Describe in detail the function and effect of the light-shielding component 1. It should be explained, such as... Figure 4 (A) and Figure 4 As shown in (B), the light-shielding member 1 is used such that the first main surface 11 is the light incident side and the second main surface 12 is the light-shielding object 100 side. That is, the light-shielding member 1 has an outer peripheral surface 13, which has a conical shape in which the area in the surface direction orthogonal to the thickness direction expands from the light incident side toward the light-shielding object 100.

[0144] like Figure 4 As shown in (A), when the outer peripheral surface 13 of the light-shielding member 1 does not have a conical shape, and when viewed in cross section along the thickness direction, the first main surface 11 of the light-shielding member 1 is orthogonal to the outer peripheral surface 13 of the light-shielding member 1, depending on the incident angle of the light L, there is a case where the light L reflected from the outer peripheral surface 13 enters the light-shielding object 100.

[0145] On the other hand, such as Figure 4 As shown in (B), when the outer peripheral surface 13 of the light-shielding member 1 has a conical shape, even when light L is incident on the outer peripheral surface 13 of the light-shielding member 1 and reflected, the reflected light L can be suppressed from entering the light-shielding object 100.

[0146] In addition, the rigidity of the light-shielding member 1 can be improved by the metal core layer 2.

[0147] 3. Second Implementation Method In the second embodiment, the same reference numerals are used to label the same components and processes as in the first embodiment, and detailed descriptions are omitted. Furthermore, unless otherwise specified, the second embodiment can achieve the same effects as the first embodiment. Moreover, the first and second embodiments can be appropriately combined.

[0148] Reference Figure 5 The second embodiment of the light-shielding member of the present invention will be described.

[0149] The light-shielding component 1 has a core layer 2, a resin layer 3, and a low-reflection layer 4.

[0150] In addition, the light-shielding member 1 has a cylindrical portion 5 that protrudes from the core layer 2 in the thickness direction.

[0151] The cylindrical portion 5 has an inner circumferential surface 51 and an outer circumferential surface 52, which serve as the inner circumferential surface of the cylindrical portion 5. The inner circumferential surface 51 is continuous from the inner circumferential surface 25 of the core. The inner circumferential surface 51 and the inner circumferential surface 25 of the core have the same inner diameter and share a common center.

[0152] The resin layer 3 is disposed between the core layer 2 and the low-reflection layer 4. The resin layer 3 covers the core layer 2.

[0153] The first main surface 31 of resin covers the first main surface 21 of the core. The second main surface 32 of resin covers the second main surface 22 of the core. The outer peripheral surface 33 of resin covers the outer peripheral surface 23 of the core. The inner peripheral surface 35 of resin covers the outer peripheral surface 52 of the cylinder.

[0154] The low-reflection layer 4 covers a first resin main surface 31, a second resin main surface 32, a resin outer peripheral surface 33, a resin inner peripheral surface 35 on the other side of the thickness direction, a core inner peripheral surface 25, and a cylinder inner peripheral surface 51. Specifically, the first main surface 11 covers the first resin main surface 31. The second main surface 12 covers the second resin main surface 32. The outer peripheral surface 13 covers the resin outer peripheral surface 33. The inner peripheral surface 15 covers the core inner peripheral surface 25, the resin inner peripheral surface 35 on the other side of the thickness direction, and the cylinder inner peripheral surface 51.

[0155] The inner circumferential surface 25 of the core is covered by a low-reflection layer 4. In addition, the inner circumferential surface 51 of the cylinder is covered by a low-reflection layer 4, thereby improving the strength around the through hole 14 of the light-shielding member 1.

[0156] The light-shielding member 1 can be manufactured based on the above-described manufacturing method for a light-shielding member. However, in the third step, the first main surface 21, the second main surface 22, and the outer peripheral surface 23 of the core are covered with a resin layer 3. Furthermore, in the fourth step, the first main surface 31, the second main surface 32, the outer peripheral surface 33, the inner peripheral surface 35, the inner peripheral surface 25 of the core, and the inner peripheral surface 51 of the cylinder are covered with a low-reflection layer 4.

[0157] 4. Variations In the modified examples, the same reference numerals are used to mark the same components and processes as in the first and second embodiments, and detailed descriptions are omitted. Furthermore, unless otherwise specified, the modified examples can achieve the same effects as the first and second embodiments. Moreover, the first embodiment, the second embodiment, and the modified examples can be appropriately combined. It should be noted that the following description will detail the modified examples of the first embodiment.

[0158] (A variation of the manufacturing method for a light-shielding component) Reference Figure 6 Examples of variations in the manufacturing method of the light-shielding component are described in (A) to (D).

[0159] The manufacturing method of the light-shielding component 1 includes: a fifth step, preparing a core layer 2; a sixth step, covering the core layer 2 with a resin layer 3; and a seventh step, covering the resin layer 3 with a low-reflection layer 4.

[0160] [Fifth Process] In the fifth process, such as Figure 6 As shown in (A), core layer 2 is prepared. To prepare core layer 2, firstly, a substrate M of material comprising the aforementioned core layer 2 is prepared. Next, as... Figure 6 As shown in (B), the substrate M is etched to prepare the core layer 2. Specifically, the portion forming the core layer 2 is covered with a photoresist, and the substrate M exposed from the photoresist is removed by etching. Thus, the core layer 2 is prepared.

[0161] [Sixth Process] In the sixth process, such as Figure 6 As shown in (C), the core layer 2 is coated with resin layer 3. Specifically, the first main surface 21, the second main surface 22, the outer peripheral surface 23, and the inner peripheral surface 25 of the core are coated with resin layer 3. The method of coating the core layer 2 with resin layer 3 is the same as the first step described above.

[0162] [Seventh Process] In the seventh process, such as Figure 6As shown in (D), the resin layer 3 is coated with a low-reflection layer 4. Specifically, the resin first main surface 31, the resin second main surface 32, the resin outer peripheral surface 33, and the resin inner peripheral surface 35 are coated with the low-reflection layer 4. The method of coating the resin layer 3 with the low-reflection layer 4 is the same as the fourth step described above.

[0163] By following the above steps, light-shielding component 1 is manufactured.

[0164] In addition, in the above description, the core layer 2 is prepared by etching the substrate M made of the material of the core layer 2. However, it is also possible to prepare the core layer 2 by placing the core layer 2 on the substrate M and then removing the substrate M by etching, based on the same steps as the second process described above.

[0165] like Figure 7 As shown, the light-shielding member 1 can also have a guide groove 40 extending through the thickness direction. The guide groove 40 ensures accurate rotation of the light-shielding member 1. The shape of the guide groove 40 is appropriately selected based on the rotation direction of the light-shielding member 1. Figure 7 In this configuration, the guide groove 40 is disposed separately from the through hole 14 along its long axis. The guide groove 40 has a top-view arc shape that shares the center of the through hole 14.

[0166] In the first and second embodiments, the through hole 14 is a round hole, but the through hole 14 is not particularly limited, for example, it can also be a square hole or a conical hole.

[0167] As a conical hole, for example, such as Figure 8 The tapered hole shown in (A) has an area that expands from the first main surface 11 toward the second main surface 12 in a direction orthogonal to the thickness direction.

[0168] In this case, when viewed in cross-section along the thickness direction, the angle γ formed by the first main surface 11 and the inner peripheral surface 15 is an acute angle. The angle γ is, for example, 45° or more, preferably 60° or more, and also, for example, less than 90°.

[0169] If the angle γ is within the range mentioned above, rotational performance can be improved.

[0170] In addition, as a conical hole, examples such as Figure 8 (B) shows a tapered hole whose area decreases from the first main surface 11 toward the second main surface 12 in the direction of the surface orthogonal to the thickness direction.

[0171] In the above description, the outer peripheral surface 13 has a conical shape (linear conical shape) in which the area in the surface direction changes linearly with respect to the thickness direction, but the outer peripheral surface 13 can also have a parabolic conical shape in which the area in the surface direction changes exponentially or with respect to the thickness direction.

[0172] As a parabolic cone shape, examples include... Figure 9 As shown in (A), the light-shielding member 1 has a central arc shape on the inner side of its outer peripheral surface 13, and as shown in (A). Figure 9 As shown in (B), the outer side of the outer peripheral surface 13 of the light-shielding member 1 has a central arc shape.

[0173] In the above description, the light-shielding member 1 is composed of a core layer 2, a resin layer 3, and a low-reflection layer 4, but the structure of the light-shielding member 1 is not limited to the above embodiment. The light-shielding member 1 may also include components other than the core layer 2, the resin layer 3, and the low-reflection layer 4. For example, the light-shielding member 1 may have a sealing layer disposed between the core layer 2 and the resin layer 3 and / or between the resin layer 3 and the low-reflection layer 4.

[0174] In the above description, the inner peripheral surface 15 is the outer surface of the low-reflection layer 4, but the inner peripheral surface 15 can also be the outer surface of the core layer 2 or the outer surface of the resin layer 3. In other words, the inner peripheral surface 15 may not be covered by the low-reflection layer 4. Additionally, as... Figure 10 As shown, the inner peripheral surface 15 may also include the outer surface of the core layer 2. If the inner peripheral surface 15 includes the outer surface of the core layer 2, the strength around the through hole 14 of the light-shielding member 1 can be improved. In addition, the inner peripheral surface 15 may also include the outer surface of the resin layer 3.

[0175] In the above description, the outer peripheral surface 13 is the outer surface of the low-reflection layer 4, but the outer peripheral surface 13 can also be the outer surface of the core layer 2 or the outer surface of the resin layer 3. In other words, the outer peripheral surface 13 may not be covered by the low-reflection layer 4. Alternatively, the outer peripheral surface 13 may also include the outer surface of the core layer 2. Alternatively, the outer peripheral surface 13 may also include the outer surface of the resin layer 3.

[0176] Alternatively, the light-shielding component 1 may not have a resin layer 3 and may instead consist of a core layer 2 and a low-reflection layer 4.

[0177] Furthermore, in the above description, the light-shielding member 1 has a generally elliptical shape when viewed from above, but the shape of the light-shielding member 1 is not particularly limited and can be appropriately changed according to its use and purpose.

[0178] It should be noted that the above-described invention is provided as an illustrative embodiment of the present invention, but this is merely illustrative and should not be interpreted as limiting. Modifications of the invention that are obvious to those skilled in the art are included within the scope of protection of the technical solutions described below.

[0179] Industrial availability The light-shielding component of the present invention can be used, for example, to block visible light.

[0180] Symbol Explanation 1: Light-shielding components 2: Core layer 3: Resin layer 4: Low-reflection layer 5: Cylinder section 11: First Main Page 12: Second Main Face 13: Outer perimeter 14: Through hole 15: Inner circumference 21: The First Main Surface of the Chip 22: Core Second Main Surface 23: Core outer periphery 24: Core through hole 25: Core inner circumference 31: First main surface of resin 32: Resin Second Main Surface 33: Resin outer peripheral surface 34: Resin through hole 35: Inner circumferential surface of resin 51: Inner circumferential surface of the cylinder.

Claims

1. A light-shielding member comprising: a core layer made of metal; and a low-reflection layer that covers the core layer, the light-shielding member has: a first main surface; a second main surface that is arranged in opposition to the first main surface at an interval on the other side in a thickness direction of the first main surface; an outer peripheral surface that is continuous with a peripheral edge of the first main surface and a peripheral edge of the second main surface and has a tapered shape in which an area in a surface direction orthogonal to the thickness direction decreases from the first main surface toward the second main surface; and a through-hole that penetrates in the thickness direction, the through-hole has an inner peripheral surface, the first main surface is an outer surface of the low-reflection layer, the second main surface is an outer surface of the low-reflection layer, a 5° specular reflectance of the low-reflection layer is lower than a 5° specular reflectance of the core layer.

2. The light shielding member according to claim 1, wherein the outer peripheral surface is an outer surface of the low-reflection layer, the inner peripheral surface is an outer surface of the low-reflection layer.

3. The light shielding member according to claim 2, wherein the core layer has: a core first main surface; a core second main surface that is arranged in opposition to the core first main surface at an interval on the other side in the thickness direction of the core first main surface; a core outer peripheral surface that is continuous with a peripheral edge of the core first main surface and a peripheral edge of the core second main surface; and a core through-hole that, when viewed in the thickness direction, includes the through-hole and penetrates in the thickness direction, the core through-hole has a core inner peripheral surface, a length between the outer peripheral surface and the core outer peripheral surface is longer than a length between the core inner peripheral surface and the inner peripheral surface. an angle formed by the first main surface and the outer peripheral surface, when viewed in a cross section along the thickness direction, is 15° or more and 70° or less.

4. The light shielding member according to claim 1, wherein the light-shielding member further comprises a resin layer that is arranged between the core layer and the low-reflection layer, 5. The light shielding member according to any one of claims 1 to 4, wherein the core layer has: a core first main surface; a core second main surface that is arranged in opposition to the core first main surface at an interval on the other side in the thickness direction of the core first main surface; a core outer peripheral surface that is continuous with a peripheral edge of the core first main surface and a peripheral edge of the core second main surface; and a core through-hole that, when viewed in the thickness direction, includes the through-hole and penetrates in the thickness direction, the core through-hole has a core inner peripheral surface, the resin layer has: a resin first main surface that covers the core first main surface and is covered by the first main surface; and a resin second main surface that is arranged in opposition to the resin first main surface at an interval on the other side in the thickness direction of the resin first main surface, covers the core second main surface, and is covered by the second main surface. the resin layer further has: a resin outer peripheral surface that is continuous with a peripheral edge of the resin first main surface and a peripheral edge of the resin second main surface, covers the core outer peripheral surface, and is covered by the outer peripheral surface; and a resin through-hole that, when viewed in the thickness direction, includes the through-hole and is included in the core through-hole and penetrates in the thickness direction, 6. The light shielding member according to claim 5, wherein the resin through-hole has a resin inner peripheral surface. the resin inner peripheral surface covers the core inner peripheral surface and is covered by the inner peripheral surface, a length between the resin outer peripheral surface and the core outer peripheral surface is longer than a length between the resin inner peripheral surface and the core inner peripheral surface. ​ ​ 7. The light shielding member according to claim 6, wherein ​ ​ 8. The light shielding member according to claim 6, wherein The light-shielding member further has a cylindrical portion that protrudes from the core layer in the thickness direction and has an inner peripheral surface that is continuous with the inner peripheral surface of the core, The inner peripheral surface of the core is covered by the low-reflection layer. The inner peripheral surface of the cylindrical portion is covered by the low-reflection layer.

9. The light shielding member according to claim 1, wherein The inner peripheral surface includes an outer surface of the core layer.

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