Light blocking material

Abstract

To provide a light-shielding member that suppresses light from entering a light-shielding target by reflection. [Solution] The light-blocking member 1 includes a metal core layer 2 and a low-reflection layer 4 covering the core layer 2. The light-blocking member 1 has a first main surface 11, a second main surface 12 disposed opposite the first main surface 11 on the other side of the thickness direction of the first main surface 11 with a gap therebetween, an outer peripheral surface 13 continuous with the peripheral edges of the first main surface 11 and the second main surface 12 and tapered such that the area in a plane direction perpendicular to the thickness direction decreases from the first main surface 11 toward the second main surface 12, and a through-hole 14 penetrating the light-blocking member 1 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 the outer surface of the low-reflection layer 4. The 5° specular reflectance of the low-reflection layer 4 is lower than the 5° specular reflectance of the core layer 2.

Description

[Technical Field]

[0001] The present invention relates to a light blocking member. [Background technology]

[0002] BACKGROUND ART Conventionally, a light-shielding member having an optical multilayer film on the surface of a base material is known (see, for example, Patent Document 1 below).

[0003] The substrate is made of resin. The optical multilayer film is composed of a light-absorbing layer and a dielectric layer. The light-absorbing layer and the dielectric layer are made of metal or metal oxide. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2021 / 193652 Brochure Summary of the Invention [Problem to be solved by the invention]

[0005] While most of the light incident on the light blocking member of Patent Document 1 is absorbed by the light absorption layer, a portion of the incident light may be reflected.

[0006] In the light-shielding member of Patent Document 1, the top surface of the light-shielding member and the side surface of the light-shielding member are perpendicular to each other in a cross section along the thickness direction, which causes a problem that light reflected from the side surface of the light-shielding member may penetrate into the object to be shielded, depending on the angle of incidence of the light.

[0007] The present invention provides a light-shielding member that suppresses light from entering a light-shielding target by reflection. [Means for solving the problem]

[0008] The present invention [1] is a light-shielding element comprising a metal core layer and a low-reflection layer covering the core layer, the light-shielding element having a first main surface, a second main surface arranged opposite to the first main surface at an interval 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 a plane direction perpendicular to the thickness direction decreases from the first main surface toward the second main surface, and a through hole penetrating 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] According to this configuration, the first main surface of the light-shielding member and the second main surface of the light-shielding member are the outer surfaces of the low-reflection layer, thereby making it possible to suppress light reflection.

[0010] In addition, the outer peripheral surface of the light-blocking member has a tapered shape, so that even when light is incident on the outer peripheral surface of the light-blocking member and is reflected, the reflected light can be prevented from penetrating into the object to be blocked.

[0011] Furthermore, the metal core layer can improve rigidity.

[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] According to this configuration, the outer peripheral surface and the inner peripheral surface of the light-shielding member are the outer surfaces of the low-reflection layer, thereby making it possible to suppress light reflection.

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

[0015] With this configuration, the durability of the outer peripheral surface of the light blocking member can be further improved.

[0016] The present invention [4] includes a light-shielding member according to any one of [1] to [3] above, in which, in a cross-sectional view 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 configuration, it is possible to further prevent light reflected from the outer peripheral surface of the light-shielding member from entering the object to be shielded.

[0018] The present invention [5] further includes a light-shielding member according to any one of [1] to [4] above, which further includes a resin layer disposed between the core layer and the low-reflection layer, wherein the core layer has a core first main surface, a core second main surface disposed opposite to and spaced apart on the other side of the core first main surface in the thickness direction, a core outer peripheral surface continuous with the peripheral edge of the core first main surface and the peripheral edge of the core second main surface, and a core through hole that includes the through hole and penetrates in the thickness direction when viewed from the thickness direction, the core through hole having a core inner peripheral surface, and the resin layer has a resin first main surface that covers the core first main surface and is coated on the first main surface, and a resin second main surface that is disposed opposite to and spaced apart on the other side of the resin first main surface in the thickness direction, covers the core second main surface, and is coated on the second main surface.

[0019] According to this configuration, the resin layer can improve durability.

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

[0021] According to this configuration, the resin layer can improve durability.

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

[0023] With this configuration, the durability of the outer peripheral surface of the light blocking member can be further improved.

[0024] The present invention [8] includes the light-shielding member described in [6] above, further comprising a tubular portion protruding from the core layer in the thickness direction and having an inner surface continuous with the inner surface of the core, the inner surface of the core being coated with the low-reflection layer, and the inner surface of the tubular portion being coated with the low-reflection layer.

[0025] With this configuration, the strength of the light blocking member around the through hole can be improved.

[0026] The present invention [9] includes the light-shielding member according to the above [1], in which the inner peripheral surface includes the outer surface of the core layer.

[0027] With this configuration, the strength of the light blocking member around the through hole can be improved. [Effects of the Invention]

[0028] According to the light-shielding member of the present invention, it is possible to prevent light from entering the object to be shielded by reflection. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is a plan view of a light blocking member according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view of the light-shielding member shown in FIG. 1 taken along the line AA. [Figure 3] 3A to 3F show one embodiment of a method for manufacturing the light-shielding member shown in FIG. 1. FIG. 3A shows a first step of preparing a resin layer. FIG. 3B shows a second step of forming a seed layer on one surface of the resin layer in the thickness direction. FIG. 3C shows a second step of disposing a core layer on one surface of the seed layer in the thickness direction. FIG. 3D shows a third step of covering the core layer with a resin layer. FIG. 3E shows a fourth step of covering the resin layer with a metal layer. FIG. 3F shows a fourth step of covering the resin layer with a low-reflection layer via the metal layer. [Figure 4] Figures 4A and 4B are explanatory diagrams illustrating the action and effect of the light-shielding member shown in Figure 1. Figure 4A is an explanatory diagram illustrating 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 tapered shape. Figure 4B is an explanatory diagram illustrating 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 tapered shape. [Figure 5] FIG. 5 is a cross-sectional view of a light blocking member according to a second embodiment of the present invention. [Figure 6] 6A to 6D show modified examples of the method for manufacturing the light-shielding member shown in FIG. 1. FIG. 6A shows a first step in which a base material made of the material for the core layer is prepared. FIG. 6B shows a first step in which the base material is removed by etching to prepare the core layer. FIG. 6C shows a sixth step in which the core layer is coated with a resin layer. FIG. 6D shows a seventh step in which the resin layer is coated with a low-reflection layer. [Figure 7] FIG. 7 is a plan view of a modified example of the light-shielding member of the present invention (a light-shielding member having a guide groove). [Figure 8]8A and 8B show modified examples of the light-shielding member of the present invention (light-shielding members in which the through holes are tapered holes). Fig. 8A shows a light-shielding member in which the through holes are tapered holes whose area in a plane direction perpendicular to the thickness direction increases from the first main surface to the second main surface. Fig. 8B shows a light-shielding member in which the through holes are tapered holes whose area in a plane direction perpendicular to the thickness direction decreases from the first main surface to the second main surface. [Figure 9] 9A and 9B show modified examples of the light-shielding member of the present invention (light-shielding members whose outer peripheral surfaces have a parabolic tapered shape). Fig. 9A shows a light-shielding member in which the parabolic tapered shape is an arc shape having a center on the inner peripheral surface side of the light-shielding member. Fig. 9B shows a light-shielding member in which the parabolic tapered shape is an arc shape having a center on the outer peripheral surface side of the light-shielding member. [Figure 10] FIG. 10 shows a modified example of the light-shielding member of the present invention (a light-shielding member in which the inner circumferential surface 15 includes the outer surface of the core layer 2). DETAILED DESCRIPTION OF THE INVENTION

[0030] 1. First embodiment A first embodiment of the light-shielding member of the present invention will be described with reference to FIGS.

[0031] As shown in Fig. 1, the light blocking member 1 has a generally elliptical shape in a plan view, and as shown in Fig. 2, it has a generally trapezoidal shape in a side view that narrows from one side in the thickness direction to the other side in the thickness direction.

[0032] As shown in FIG. 2, the light-shielding member 1 has a first main surface 11, a second main surface 12, an outer peripheral surface 13, and through holes .

[0033] The first main surface 11 is a flat surface.

[0034] The second main surface 12 is disposed opposite to and spaced apart from the first main surface 11 on the other side in the thickness direction of the first main surface 11. The second main surface 12 is parallel to the first main surface 11. The second main surface 12 is a flat surface.

[0035] A flat surface is a surface that appears flat at first glance, and for example, minute irregularities or waviness of less than 15 μm are permitted (the same applies below).

[0036] The outer peripheral surface 13 is continuous with the peripheral edge of the first main surface 11 and the peripheral edge of the second main surface 12. The outer peripheral surface 13 has a tapered shape in which the area in a plane direction perpendicular 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 tapered shape in which the area in the plane direction changes linearly with respect to the thickness direction (linear tapered shape). The outer peripheral surface 13 is a flat surface.

[0037] In a cross-sectional view along the thickness direction, the angle α formed between the first main surface 11 and the outer peripheral surface 13 is an acute angle. The angle α is in the range of, for example, 15° to 70°, or preferably 25° to 60°.

[0038] If the angle α is within the above range, it is possible to further prevent light reflected from the outer peripheral surface 13 of the light-shielding member 1 from entering an object to be shielded (described later).

[0039] The angle α is calculated from a profile of the outer peripheral surface 13 obtained using a laser microscope. Specifically, first, the slope (slope function) of a line connecting the outer peripheral edge of the second main surface 12 and the inner peripheral edge of the second main surface 12 is calculated, and then converted into an angle (first angle) using an arctangent. Next, the slope (slope function) of a line connecting the peripheral edge of the first main surface 11 and the peripheral edge of the second main surface 12 is calculated, and then converted into an angle (second angle) using an arctangent. Next, the first angle is corrected based on the second angle to calculate the angle α.

[0040] In addition, in a cross-sectional view along the thickness direction, the angle β formed between the second main surface 12 and the outer peripheral surface 13 is an obtuse angle. The angle β is in the range of, for example, 110° to 165°, or preferably 120° to 155°.

[0041] The sum of angles α and β is 180°.

[0042] The through-hole 14 penetrates the light-shielding member 1 in the thickness direction. By inserting a fixing member (not shown) into the through-hole 14, the light-shielding member 1 can be rotated around the fixing member as a central axis. By rotating the light-shielding member 1, it can be placed in a light-shielding position or a light-entering position relative to a light-shielding target (described later).

[0043] The through hole 14 has an inner circumferential surface 15 .

[0044] The through hole 14 is a round hole. Rotatability can be improved if the through hole 14 is a round hole. The inner diameter of the through hole 14 is in the range of, for example, 50 μm to 1000 μm, or preferably 100 μm to 500 μm.

[0045] 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 described later. In other words, all surfaces of the light-shielding member 1 are the outer surfaces of the low-reflection layer 4.

[0046] The light blocking member 1 blocks at least visible light.

[0047] The light-shielding member 1 has a visible light transmittance (JIS7375) in the thickness direction of, for example, 1.0% or less, preferably 0.01% or less, and more preferably 0%.

[0048] The 5° specular reflectance of visible light on 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 is, for example, 1.0% or less, preferably 0.5% or less, and for example, 0% or more.

[0049] The regular reflectance is measured as the average value of the reflectance of visible light having a wavelength of 500 nm to 600 nm.

[0050] The light-shielding member 1 has a flexural modulus (JIS7171) of, for example, 10 GPa to 250 GPa, or preferably 50 GPa to 200 GPa.

[0051] The thickness T of the light shielding member 1 is in the range of, for example, 10 μm to 150 μm, preferably 20 μm to 100 μm, or more preferably 30 μm to 90 μm.

[0052] Specifically, 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 for example, 150 μm or less, preferably 100 μm or less, more preferably 90 μm or less.

[0053] The length of the major axis of the light blocking member 1 is in the range of, for example, 1 mm to 30 mm, or preferably 3 mm to 10 mm.

[0054] The length of the minor axis of the light blocking member 1 is in the range of, for example, 0.5 mm to 15 mm, or preferably 1 mm to 7 mm.

[0055] The light-shielding member 1 includes a core layer 2, a resin layer 3, and a low-reflection layer 4.

[0056] <Core layer> The core layer 2 is disposed in the approximate center of the light blocking member 1 in the thickness direction. The core layer 2 extends in the orthogonal direction. The core layer 2 has a rectangular flat plate shape in plan view.

[0057] The core layer 2 has a core first main surface 21, a core second main surface 22, a core outer peripheral surface 23, and a core through-hole 24.

[0058] The core first main surface 21 is a flat surface.

[0059] The core second main surface 22 is disposed opposite to and spaced apart from the core first main surface 21 on the other thickness direction side. The core second main surface 22 is parallel to the core first main surface 21. The core second main surface 22 is a flat surface.

[0060] The core outer peripheral surface 23 is continuous with the peripheral edge of the core first main surface 21 and the peripheral edge of the core second main surface 22. The core outer peripheral surface 23 is a flat surface.

[0061] The core through hole 24 penetrates in the thickness direction and includes the through hole 14 and a resin through hole 34 described later when viewed in the thickness direction of the light blocking member 1. The core through hole 24 has a shape similar to that of the through hole 14.

[0062] The core through-hole 24 has a core inner peripheral surface 25 .

[0063] The inner diameter of the core through-hole 24 is in the range of, for example, 50 μm to 1000 μm, or preferably 100 μm to 500 μm.

[0064] The ratio of the inner diameter of the through-hole 14 to the inner diameter of the core through-hole 24 is in the range of, for example, 0.5 to 1.0, or preferably 0.8 to 1.0.

[0065] The core layer 2 has a thickness T1 in the range of, for example, 5 μm to 70 μm, or preferably 10 μm to 30 μm.

[0066] Specifically, from the viewpoint of improving rigidity, the thickness T1 of the core layer 2 is, for example, 5 μm or more, or preferably 10 μm or more, and for example, 70 μm or less, or preferably 30 μm or less.

[0067] When the thickness T of the light shielding member 1 is taken as 100%, the thickness T1 of the core layer 2 is in the range of, for example, 10% to 50%, or preferably 15% to 40%.

[0068] Specifically, if the thickness T of the light-shielding member 1 is 100%, the thickness T1 of the core layer 2 is, from the viewpoint of improving rigidity, for example, 10% or more, preferably 15% or more, and for example, 50% or less, preferably 40% or less.

[0069] The core layer 2 is made of metal. Examples of materials for the core layer 2 include copper, copper alloys, stainless steel, aluminum, titanium, nickel, tantalum, and magnesium. Preferred materials for the core layer 2 include copper and stainless steel.

[0070] The core layer 2 has a specular reflectance of visible light at 5° of, for example, 10% to 80%.

[0071] <Resin layer> 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. The resin layer 3 covers the core first main surface 21, the core second main surface 22, the core outer peripheral surface 23, and the core inner peripheral surface 25. The resin layer 3 can improve durability.

[0072] The resin layer 3 has a resin first main surface 31, a resin second main surface 32, a resin outer peripheral surface 33, and resin through holes .

[0073] The resin first main surface 31 is a flat surface. The resin first main surface 31 covers the core first main surface 21.

[0074] The resin second main surface 32 is disposed opposite to and spaced apart from the resin first main surface 31 on the other side in the thickness direction of the core. The resin second main surface 32 is parallel to the resin first main surface 31. The resin second main surface 32 is a flat surface. The resin second main surface 32 covers the core second main surface 22.

[0075] 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 shape similar to that of the outer peripheral surface 13. The resin outer peripheral surface 33 covers the core outer peripheral surface 23.

[0076] When viewed from the thickness direction of the light blocking member 1, the resin through hole 34 includes the through hole 14 and is included in the core through hole 24, penetrating in the thickness direction. The resin through hole 34 has a shape similar to that of the through hole 14.

[0077] The resin through hole 34 has a resin inner peripheral surface 35. The resin inner peripheral surface 35 covers the core inner peripheral surface 25.

[0078] The resin layer 3 has a thickness T2 in the range of, for example, 3 μm to 50 μm, or preferably 5 μm to 20 μm.

[0079] Specifically, from the viewpoint of improving durability, the thickness T2 of the resin layer 3 is, for example, 3 μm or more, or preferably 5 μm or more, and for example, 500 μm or less, or preferably 20 μm or less.

[0080] 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 taken as 100%, the thickness T2 of the resin layer 3 is in the range of, for example, 40% to 90%, or preferably 50% to 70%.

[0081] When the thickness T of the light-shielding member 1 is taken as 100%, the thickness T2 of the resin layer 3 is in the range of, for example, 5% to 40%, or preferably 10% to 30%.

[0082] Specifically, if the thickness T of the light-shielding member 1 is 100%, the thickness T2 of the resin layer 3 is, from the viewpoint of improving durability, for example, 5% or more, preferably 10% or more, and for example, 40% or less, preferably 30% or less.

[0083] Examples of materials for the resin layer 3 include resins. Examples of resins include acrylic resins, epoxy resins, polyimides (e.g., photosensitive polyimides), and silicone-based resins. A preferred example of the resin is polyimide. That is, the resin layer 3 preferably contains polyimide. If the resin layer 3 contains polyimide, it will have excellent dimensional accuracy.

[0084] The 5° specular reflectance of the resin layer 3 for visible light is, for example, 5% to 20%.

[0085] <Low reflective layer> The low-reflection layer 4 covers the core layer 2 and the resin layer 3. Specifically, the low-reflection layer 4 covers 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. Specifically, as described above, the light-shielding member 1 has the through-hole 14 having the first main surface 11, the second main surface 12, the outer peripheral surface 13, and the inner peripheral surface 15. That is, the low-reflection layer 4 has the first main surface 11, the second main surface 12, the outer peripheral surface 13, and the inner peripheral surface 15. The first main surface 11 covers the resin first main surface 31. The second main surface 12 covers the resin second main surface 32. The outer peripheral surface 13 covers the resin outer peripheral surface 33. The inner peripheral surface 15 covers the resin inner peripheral surface 35.

[0086] The 5° specular reflectance of visible light of the low-reflection layer 4 is lower than the 5° specular reflectance of visible light of the core layer 2. The 5° specular reflectance of visible light of the low-reflection layer 4 is, for example, 1.0% or less, preferably 0.5% or less, for example, 0% or more.

[0087] The low reflective layer 4 has a thickness T3 in the range of, for example, 0.01 μm to 30 μm, or preferably 0.05 μm to 20 μm.

[0088] Specifically, from the viewpoint of improving light blocking properties, the thickness T3 of the low reflective layer 4 is, for example, 0.01 μm or more, or preferably 0.05 μm or more, and for example, 30 μm or less, or preferably 20 μm or less.

[0089] When the thickness T1 of the core layer 2 is taken as 100%, the thickness T3 of the low reflective layer 4 is in the range of, for example, 0.1% to 150%, or preferably 0.3% to 140%.

[0090] When the thickness T of the light-shielding member 1 is taken as 100%, the thickness T3 of the low-reflection layer 4 is in the range of, for example, 0.05% to 40%, or preferably 0.1% to 30%.

[0091] Specifically, when the thickness T of the light-shielding member 1 is taken as 100%, the thickness T3 of the low-reflection layer 4 is, for example, 0.05% or more, preferably 0.1% or more, from the viewpoint of improving light-shielding properties, and is, for example, 40% or less, preferably 30% or less, from the viewpoint of reducing weight.

[0092] The surface roughness Ra (arithmetic mean surface roughness in accordance with JIS B 0601-2001) of the low reflective layer 4 is in the range of, for example, 1.0 nm to 15000 nm, or preferably 100 nm to 5000 nm.

[0093] Examples of materials for the low reflection layer 4 include resin compositions, metals and oxides thereof.

[0094] The resin composition contains a resin, a pigment, and a filler. That is, when the material of the low-reflection layer 4 is a resin composition, the low-reflection layer 4 contains a resin, a pigment, and a filler.

[0095] Examples of the resin include acrylic resin, epoxy resin, polyimide, and polyamide, and preferably acrylic resin.

[0096] The resin content in the resin composition is, for example, 20% by mass to 80% by mass, or preferably 30% by mass to 70% by mass.

[0097] Examples of the pigment include black pigments and gray pigments. Preferably, the pigment is black pigment. Preferably, the black pigment is black pigment and black dye. Preferably, the black pigment is carbon black or a titanium-based pigment. Preferably, the black dye is a mixture of dyes such as phthalocyanine blue, phthalocyanine green, monoazo yellow, disazo yellow, benzimidazolone yellow, quinacridone red, monoazo red, boriazo red, and perylene red. More preferably, the pigment is black. Still more preferably, the pigment is carbon black.

[0098] The content of the dye in the resin composition is, for example, 0.1 to 20% by mass, or preferably 0.5 to 10% by mass.

[0099] The content of the dye relative to 100 parts by mass of the resin is, for example, 1 to 50 parts by mass, or preferably 5 to 30 parts by mass.

[0100] Examples of the filler include acrylic microgel and silica, and preferably, acrylic microgel.

[0101] The average particle size of the filler is measured by a laser diffraction scattering method and is, for example, 1.0 μm or more, preferably 5.0 μm or more, and, for example, 20.0 μm or less.

[0102] The content of the filler in the resin composition is, for example, 1 to 50% by mass, or preferably 5 to 30% by mass.

[0103] The content ratio of the filler relative to 100 parts by mass of the resin is, for example, 5 parts by mass to 50 parts by mass, or preferably 10 parts by mass to 40 parts by mass.

[0104] Furthermore, as will be described in detail later, in the fourth step, when the low-reflection layer 4 is disposed by electrodeposition coating, the low-reflection layer 4 contains the material of the metal layer M3.

[0105] Metals and their oxides include, for example, titanium, nickel, chromium, and niobium and their oxides.

[0106] In the light-shielding member 1, the length D between the resin outer peripheral surface 33 and the core outer peripheral surface 23 is preferably 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, 50 or less.

[0107] If 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, the durability of the outer peripheral surface 13 of the light blocking member 1 can be further improved.

[0108] Furthermore, in the light-shielding member 1, the length F between the outer peripheral surface 13 and the core outer peripheral surface 23 is preferably 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 of the core inner peripheral surface 25 and the inner peripheral surface 13 (length F / length G) is, for example, greater than 1, preferably 1.5 or more, and, for example, 50 or less.

[0109] If 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 durability of the outer peripheral surface 13 of the light blocking member 1 can be further improved.

[0110] <Method of manufacturing light-shielding member> An embodiment of a method for manufacturing a light-shielding member will be described with reference to FIGS. 3A to 3F.

[0111] The manufacturing method of the light-shielding member 1 includes a first step of preparing a resin layer 3, a second step of arranging a core layer 2 on the other thickness-wise surface of the resin layer 3, a third step of coating the core layer 2 with the resin layer 3, and a fourth step of coating the resin layer 3 with a low-reflection layer 4.

[0112] [1st step] In the first step, as shown in Fig. 3A, the resin layer 3 is prepared. Specifically, to prepare the resin layer 3, first, a base material M1 is prepared.

[0113] The substrate M1 is made of a metal that can be removed by etching, such as stainless steel.

[0114] Next, a resin layer 3 is disposed on the other surface in the thickness direction of the substrate M1. Next, if the material of the resin layer 3 is a photosensitive resin, a solution (varnish) of the material of the resin layer 3 is applied to the other surface in the thickness direction of the substrate M1 to obtain a coating film, and then the coating film is exposed to light and developed. In this way, the resin layer 3 is disposed on the other surface in the thickness direction of the substrate M1. Furthermore, if the material of the resin layer 3 is not a photosensitive resin (if it is a non-photosensitive resin), the solution (varnish) of the material of the resin layer 3 is printed to dispose the resin layer 3.

[0115] [Second process] In the second step, as shown in FIG. 3B, a core layer 2 is disposed on the other surface in the thickness direction of the resin layer 3. Specifically, a seed layer M2 is first formed on the other surface in the thickness direction of the resin layer 3 by sputtering. Examples of materials for the seed layer M2 include chromium, copper, nickel, titanium, and alloys thereof. The seed layer M2 may be a single layer or multiple layers.

[0116] 3C, a resist R having an opening where the core layer 2 will be formed is placed on the other thickness-wise surface of the base material M1. The core layer 2 is then placed by electroplating on the other thickness-wise surface of the seed layer M2 exposed from the resist R. Plating ensures that the core layer 2 is reliably placed.

[0117] [3rd step] 3D, in the third step, the core layer 2 is coated with a resin layer 3. More specifically, the core first main surface 21, the core second main surface 22, the core outer peripheral surface 23, and the core inner peripheral surface 25 are coated with the resin layer 3. The method for coating the core first main surface 21, the core second main surface 22, the core outer peripheral surface 23, and the core inner peripheral surface 25 with the resin layer 3 is the same as in the first step.

[0118] 3D, the core layer 2 and the seed layer M2 are integrated together to form the core layer 2. Then, the base material M1 is removed by etching.

[0119] [4th step] 3E, 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.

[0120] Methods for coating 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 with the low-reflection layer 4 include, for example, electrodeposition coating, physical vapor deposition, and plating (e.g., electrolytic plating).

[0121] When the material of the low-reflection layer 4 is a resin composition, the electrodeposition coating method is preferably selected as the coating method. When the material of the low-reflection layer 4 is a metal or its oxide, the physical vapor deposition method is preferably selected as the coating method.

[0122] In the electrodeposition coating method, first, the resin layer 3 is coated with a metal layer M3. 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 metal layer M3.

[0123] Examples of materials for the metal layer M3 include chromium, nickel, titanium, copper, nickel chromium, tungsten, cobalt, and alloys thereof.

[0124] The material of the metal layer M3 can be used alone or in combination of two or more kinds.

[0125] Methods for coating the metal layer M3 include, for example, physical vapor deposition and electroless plating.

[0126] Examples of the physical vapor deposition method include vacuum deposition, sputtering, and ion plating. Of the physical vapor deposition methods, sputtering is preferred.

[0127] The metal layer M3 has a thickness of, for example, 1 nm to 1000 nm, or preferably 10 nm to 500 nm. When the thickness of the metal layer M3 is at least the above lower limit, the adhesion between the resin layer 3 and the low-reflection layer 4 can be improved.

[0128] The metal layer M3 can be a single layer or a multilayer.

[0129] Next, as shown in Fig. 3F, the resin layer 3 is coated with a low-reflection layer 4 via the metal layer M3 by electrodeposition coating. 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 via the metal layer M3. In Fig. 3F, the low-reflection layer 4 is shown to include the metal layer M3.

[0130] In this way, the light blocking member 1 is manufactured.

[0131] 2. Action and 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.

[0132] Furthermore, the outer peripheral surface 13 of the light-shielding member 1 has a tapered shape. Therefore, even when light is incident on the outer peripheral surface 13 of the light-shielding member 1 and is reflected, the reflected light can be prevented from entering the light-shielding target 100.

[0133] 4A and 4B, the effects of the light-shielding member 1 will be described in detail. As shown in Fig. 4A and 4B, the light-shielding member 1 is used so that the first main surface 11 is the light incident side and the second main surface 12 is the light-shielding target 100 side. In other words, the light-shielding member 1 has an outer peripheral surface 13 having a tapered shape in which the area in the surface direction perpendicular to the thickness direction increases from the light incident side toward the light-shielding target 100.

[0134] As shown in Figure 4A, if the outer surface 13 of the light-shielding member 1 does not have a tapered shape and, in a cross-sectional view along the thickness direction, the first main surface 11 of the light-shielding member 1 and the outer surface 13 of the light-shielding member 1 are perpendicular to each other, depending on the angle of incidence of the light L, the light L reflected from the outer surface 13 may enter the light-shielding target 100.

[0135] On the other hand, as shown in Figure 4B, when the outer surface 13 of the light-shielding member 1 has a tapered shape, even if light L is incident on the outer surface 13 of the light-shielding member 1 and is reflected, the reflected light L can be prevented from entering the light-shielding target 100.

[0136] Furthermore, the rigidity of the light shielding member 1 can be improved by the metal core layer 2.

[0137] 3. Second embodiment In the second embodiment, the same components and steps as those in the first embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted. Furthermore, the second embodiment can achieve the same effects as those of the first embodiment, unless otherwise specified. Furthermore, the first and second embodiments can be combined as appropriate.

[0138] A second embodiment of the light-shielding member of the present invention will be described with reference to FIG.

[0139] The light-shielding member 1 includes a core layer 2, a resin layer 3, and a low-reflection layer 4.

[0140] The light shielding member 1 also includes a tubular portion 5 that protrudes from the core layer 2 to one side in the thickness direction.

[0141] The cylindrical portion 5 has a cylindrical portion inner peripheral surface 51 as the inner peripheral surface of the cylindrical portion 5, and a cylindrical portion outer peripheral surface 52. The cylindrical portion inner peripheral surface 51 is continuous with the core inner peripheral surface 25. The cylindrical portion inner peripheral surface 51 and the core inner peripheral surface 25 have the same inner diameter and share a common center.

[0142] 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.

[0143] The resin first principal surface 31 covers the core first principal surface 21. The resin second principal surface 32 covers the core second principal surface 22. The resin outer peripheral surface 33 covers the core outer peripheral surface 23. The resin inner peripheral surface 35 covers the cylindrical portion outer peripheral surface 52.

[0144] The low-reflection layer 4 covers the resin first main surface 31, the resin second main surface 32, the resin outer peripheral surface 33, the resin inner peripheral surface 35 on the other side in the thickness direction, the core inner peripheral surface 25, and the tubular portion inner peripheral surface 51. Specifically, the first main surface 11 covers the resin first main surface 31. The second main surface 12 covers the resin second 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 in the thickness direction, and the tubular portion inner peripheral surface 51.

[0145] Since the core inner peripheral surface 25 is coated with the low-reflection layer 4 and the cylindrical portion inner peripheral surface 51 is also coated with the low-reflection layer 4, the strength of the light-shielding member 1 around the through-hole 14 can be improved.

[0146] The light-shielding member 1 can be manufactured based on the above-described method for manufacturing a light-shielding member. However, in a third step, the core first main surface 21, the core second main surface 22, and the core outer peripheral surface 23 are coated with a resin layer 3. In a fourth step, the resin first main surface 31, the resin second main surface 32, the resin outer peripheral surface 33, the resin inner peripheral surface 35, the core inner peripheral surface 25, and the cylindrical portion inner peripheral surface 51 are coated with a low-reflection layer 4.

[0147] 4. Variations In the modified example, the same components and steps as those in the first and second embodiments are denoted by the same reference numerals, and detailed descriptions thereof will be omitted. Furthermore, the modified example can achieve the same effects as those in the first and second embodiments, unless otherwise specified. Furthermore, the first and second embodiments and the modified example can be combined as appropriate. In the following description, the modified example will be described in detail as a modified example of the first example.

[0148] (Modification of the manufacturing method of the light-shielding member) A modified example of the method for manufacturing the light blocking member will be described with reference to FIGS. 6A to 6D.

[0149] The method for manufacturing the light-shielding member 1 includes a fifth step of preparing a core layer 2, a sixth step of covering the core layer 2 with a resin layer 3, and a seventh step of covering the resin layer 3 with a low-reflection layer 4.

[0150] [5th ​​step] In the fifth step, as shown in FIG. 6A, the core layer 2 is prepared. To prepare the core layer 2, first, a base material M made of the material for the core layer 2 described above is prepared. Next, as shown in FIG. 6B, the base material M is etched to prepare the core layer 2. More specifically, the portion where the core layer 2 is to be formed is covered with an etching resist, and the base material M exposed from the etching resist is removed by etching. In this way, the core layer 2 is prepared.

[0151] [6th step] In the sixth step, as shown in Fig. 6C, the core layer 2 is coated with the resin layer 3. Specifically, the core first main surface 21, the core second main surface 22, the core outer peripheral surface 23, and the core inner peripheral surface 25 are coated with the resin layer 3. The method for coating the core layer 2 with the resin layer 3 is the same as in the first step.

[0152] [Step 7] 6D, 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 for coating the resin layer 3 with the low-reflection layer 4 is the same as in the above-described fourth step.

[0153] In this way, the light blocking member 1 is manufactured.

[0154] 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, the core layer 2 can also be prepared by placing the core layer 2 on the substrate M based on a procedure similar to that of the second step, and then removing the substrate M by etching.

[0155] As shown in Fig. 7, the light blocking member 1 may also be provided with a guide groove 40 that penetrates in the thickness direction. The guide groove 40 ensures accurate rotation of the light blocking member 1. The shape of the guide groove 40 is selected appropriately based on the rotation direction of the light blocking member 1. In Fig. 7, the guide groove 40 is disposed away from the through hole 14 in the long axis direction. The guide groove 40 has an arc shape in plan view that shares the center with the through hole 14.

[0156] In the first and second embodiments, the through-hole 14 is a round hole, but the through-hole 14 is not particularly limited, and may be, for example, a square hole or a tapered hole.

[0157] An example of a tapered hole is a tapered hole whose area in a plane direction perpendicular to the thickness direction increases from first main surface 11 to second main surface 12 as shown in FIG. 8A.

[0158] In such a case, in a cross-sectional view along the thickness direction, the angle γ formed between the first main surface 11 and the inner circumferential surface 15 is an acute angle. The angle γ is, for example, 45° or more, preferably 60° or more, and, for example, less than 90°.

[0159] If the angle γ is within the above range, the rotational performance can be improved.

[0160] Further, as an example of a tapered hole, as shown in FIG. 8B, a tapered hole whose area in a plane direction perpendicular to the thickness direction decreases from first main surface 11 to second main surface 12 can be given.

[0161] In the above description, the outer peripheral surface 13 has a tapered shape (linear tapered 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 tapered shape in which the area in the surface direction changes exponentially or as a square root with respect to the thickness direction.

[0162] Examples of the parabolic tapered shape include an arc shape having a center inside the outer peripheral surface 13 of the light-shielding member 1, as shown in FIG. 9A, and an arc shape having a center outside the outer peripheral surface 13 of the light-shielding member 1, as shown in FIG. 9B.

[0163] In the above description, the light-shielding member 1 is composed of the core layer 2, the resin layer 3, and the low-reflection layer 4, but the configuration of the light-shielding member 1 is not limited to the above embodiment. The light-shielding member 1 may 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 an adhesion 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.

[0164] In the above description, the inner circumferential surface 15 is the outer surface of the low-reflection layer 4, but the inner circumferential surface 15 may also be the outer surface of the core layer 2 or the outer surface of the resin layer 3. In other words, the inner circumferential surface 15 does not have to be covered with the low-reflection layer 4. Furthermore, as shown in FIG. 10 , the inner circumferential surface 15 may also include the outer surface of the core layer 2. If the inner circumferential 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. Furthermore, the inner circumferential surface 15 may also include the outer surface of the resin layer 3.

[0165] 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 may 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 does not have to be covered with the low-reflection layer 4. The outer peripheral surface 13 may also include the outer surface of the core layer 2. The outer peripheral surface 13 may also include the outer surface of the resin layer 3.

[0166] Furthermore, the light-shielding member 1 may be configured with only the core layer 2 and the low-reflection layer 4 without including the resin layer 3 .

[0167] Furthermore, in the above description, the light blocking member 1 has a generally elliptical shape in plan view, but the shape of the light blocking member 1 is not particularly limited and can be changed as appropriate depending on the application and purpose. [Explanation of symbols]

[0168] 1 Light blocking material 2 Core layer 3 Resin layer 4 Low reflective layer 5 Cylinder part 11 First main surface 12 Second main surface 13 Outer surface 14 Through holes 15 Inner surface 21 Core first principal surface 22 Core second principal surface 23 Core outer surface 24 Core through hole 25 Core inner surface 31 Resin first main surface 32 Resin second main surface 33 Resin outer surface 34 Resin through hole 35 Resin inner surface 51 Inner peripheral surface of cylinder part

Claims

1. A light-shielding member comprising a metal core layer and a low-reflection layer covering the core layer, The light blocking member is A first major surface; a second main surface disposed opposite to and spaced apart from the first main surface on the other side in the thickness direction; 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 plane direction perpendicular to the thickness direction decreases from the first main surface toward the second main surface; A through hole penetrating in the thickness direction, The through hole has an inner circumferential 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 light-shielding member, wherein the 5° specular reflectance of the low-reflection layer is lower than the 5° specular reflectance of the core layer.

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

3. The core layer is a core first main surface; a core second main surface disposed opposite to and spaced apart from the core first main surface on the other side in the thickness direction; 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; a core through-hole that includes the through-hole when viewed from the thickness direction and penetrates in the thickness direction, the core through-hole has a core inner peripheral surface, The light-shielding member according to claim 2 , wherein a length between the outer peripheral surface and the outer peripheral surface of the core is longer than a length between the inner peripheral surface of the core and the inner peripheral surface.

4. The light-shielding member according to claim 1 , wherein an angle formed between the first main surface and the outer circumferential surface is equal to or greater than 15° and equal to or less than 70° in a cross-sectional view along the thickness direction.

5. further comprising a resin layer disposed between the core layer and the low-reflection layer, The core layer is a core first main surface; a core second main surface disposed opposite to and spaced apart from the core first main surface on the other side in the thickness direction; 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; a core through-hole that includes the through-hole when viewed from the thickness direction and penetrates in the thickness direction, the core through-hole has a core inner peripheral surface, The resin layer is a resin first principal surface that covers the core first principal surface and is coated on the first principal surface; A light-shielding member described in any one of claims 1 to 4, having a resin second main surface arranged opposite the resin first main surface at a distance from the other side of the thickness direction, covering the core second main surface, and covered by the second main surface.

6. The resin layer further comprises: The outer circumferential surface of the resin that is continuous with the peripheral edge of the first main surface of the resin and the peripheral edge of the second main surface of the resin, covers the outer circumferential surface of the core, and is covered by the outer circumferential surface of the resin, Viewed from the thickness direction, it includes the through hole and a resin through hole that is included in the core through hole and penetrates in the thickness direction, The light-shielding member according to claim 5, wherein the resin through-hole has an inner circumferential surface of resin.

7. The resin inner surface covers the core inner surface, and is covered on the inner surface. The light-shielding member according to claim 6, wherein the length between the outer surface of the resin and the outer surface of the core is longer than the length between the inner surface of the resin and the inner surface of the core.

8. The system further comprises a cylindrical portion that protrudes from the core layer in the thickness direction and has an inner surface continuous with the inner surface of the core, The inner surface of the core is covered with the low-reflection layer. The light-shielding member according to claim 6, wherein the inner circumferential surface of the cylindrical portion is covered with the low-reflection layer.

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

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