Light beam converging member and optical component

Abstract

To provide a light converging member that enables reduction in light distribution angle and reduction in size of a light source, and to provide an optical component.SOLUTION: A light converging member 10 is used for an optical component 100 having an optical element 14 for emitting light, and comprises: a recess 32 facing the optical element 14 and having a size of 0.5 times or more of the maximum length of a light-emitting area of the optical element; and a lens body 30 for converging light passing through the recess 32.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a light converging member and an optical component that converge light from an optical element.

Background Art

[0002] Ultraviolet light sources are used in various fields such as purification, sterilization, and optical analysis. As such an ultraviolet light source, an optical element (for example, LED: light emitting diode, LD: semiconductor laser) that is easy to miniaturize has been developed (see, for example, Japanese Patent Application Laid-Open No. 2016-121926).

[0003] Here, for example, for optical analysis (as an example, DNA (deoxyribonucleic acid) concentration analysis), it is preferable that the change in the intensity of light accompanying the change in the distance from the light source to the illuminance sensor is small, that is, the light distribution angle of the light is narrow.

[0004] However, in a surface light emitting source such as an LED, in order to obtain a narrow light distribution angle, it is a general method to use a large lens, and it is not easy to achieve both reduction (narrowing) of the light distribution angle and miniaturization of the light source.

Summary of the Invention

[0005] An object of the present invention is to provide a light converging member and an optical component that achieve both reduction of the light distribution angle and miniaturization of the light source.

[0006] The light converging member according to an embodiment is used for an optical component having an optical element that emits light, and includes a concave portion that faces the optical element and has a size of 0.5 times or more the maximum length of the light emitting region in the optical element, and a lens body that converges the light that has passed through the concave portion.

[0007] According to the present invention, it is possible to provide a light converging member and an optical component that achieve both reduction of the light distribution angle and miniaturization of the light source.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

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Figure 8

Figure 9

Mode for Carrying Out the Invention

[0009] Hereinafter, with reference to FIGS. 1 to 9, a light converging member and an optical component according to an embodiment will be described.

[0010] As shown in FIG. 1, the optical component 100 has at least one optical element 14 and a package 16. The optical element 14 emits light (for example, ultraviolet light), and the package 16 houses the optical element 14.

[0011] The optical element 14 is, for example, an LED (light emitting diode) or an LD (semiconductor laser). Although not shown, the optical element 14 can be configured by laminating a GaN-based crystal layer having a quantum well structure on, for example, a sapphire substrate.

[0012] For the optical element 14, for example, a so-called face-up mounting can be adopted in which the crystal layer formation surface 14a is faced to the light converging member 10 described later and functions as a light emission surface. That is, a terminal (not shown) led out from the optical element 14 and a circuit wiring (not shown) formed on the mounting substrate 18 are electrically connected by, for example, a bonding wire (not shown). In addition, a so-called flip-chip mounting in which the crystal layer formation surface 14a is disposed on the bottom surface of the accommodation space 26 and the back surface of the sapphire substrate functions as a light emission surface can also be adopted.

[0013] The package 16 has a mounting substrate 18 and a light converging member 10.

[0014] The mounting substrate 18 is composed of, for example, aluminum nitride, alumina, or aluminum, has an accommodation space 26, and accommodates the optical element 14 therein. The accommodation space 26 has, for example, a cylindrical shape or a rectangular parallelepiped shape, and the optical element 14 is disposed on the bottom surface thereof.

[0015] The light converging member 10 is fixed on the mounting substrate 18 and has a pedestal 28, a lens body 30, and a recess 32 as shown in FIGS. 1 and 2. The pedestal 28 and the lens body 30 can be integrally formed of a material (for example, quartz glass, borosilicate glass, silicone resin, fluororesin, refractive index n = 1.44 to 1.54 of these materials) that transmits light (for example, ultraviolet light). As will be described later, quartz glass can be formed, for example, by a powder sintering method. In addition, borosilicate glass, silicone resin, and fluororesin can be formed, for example, by press molding, injection molding, or machining.

[0016] The light converging member 10 is joined to the mounting substrate 18 via, for example, an organic or metal bonding layer 20. As the organic bonding layer 20, for example, an epoxy-based, silicone-based, or urethane-based adhesive can be used. As the metal bonding layer 20, for example, an AuSn-based solder can be used.

[0017] The pedestal 28 has an annular shape and is fixed on the mounting substrate 18. The outer shape (planar shape) of the pedestal 28 is, for example, a square shape. However, the outer shape of the pedestal 28 may be a circular shape, a rectangular shape, a triangular shape, a hexagonal shape, or other polygonal shapes. Note that the light converging member 10 may be constituted by the lens body 30 and the concave portion 32 without using the pedestal 28.

[0018] The lens body 30 converges light and is integrally formed on the pedestal 28 and has, for example, a convex shape upward. The outer periphery of the lens body 30 can be shaped such that it continuously shrinks as it moves away from the optical element 14. Also, the lens body 30 can have a symmetric curved surface shape with respect to the central axis O. Note that not all of the outer surface of the lens body 30 needs to be a curved surface. For example, it is also acceptable to make the vicinity of the top of the lens body 30 (a part of the upper surface that intersects the central axis O) a planar shape. This is because the light traveling along the central axis O has less need for convergence.

[0019] It is preferable that the ratio (aspect ratio Rm = hm / Lm) of the maximum height hm to the maximum diameter Lm of the lens body 30 is greater than 0.5 (tall lens shape). By making the aspect ratio Rm greater than 0.5, it becomes easier to reduce the light distribution angle θf.

[0020] A bottom surface 30a can be conceived at the boundary between the lens body 30 and the pedestal 28. The planar shape of this bottom surface 30a is, for example, a circular shape. However, the planar shape of the bottom surface 30a may be an elliptical shape, a track shape, or the like.

[0021] The concave portion 32 is disposed to face the optical element 14 and supports the light converging function of the lens body 30 as described later , match and contributes to the reduction of the light angle θf. Here, the concave portion 32 is formed in the pedestal 28, but it may be formed in the lens body 30 as described later.

[0022] The recess 32 can have various shapes such as a dome shape, a cylindrical shape, a prismatic shape (e.g., a triangular prism, a quadrangular prism, a prism shape with five or more sides), a conical shape, a pyramidal shape (e.g., a triangular pyramid, a quadrangular pyramid, a pyramid shape with five or more sides). In the case of a conical shape or a pyramidal shape, it is preferably arranged such that its top is upward.

[0023] The bottom surface of the recess 32 can have, for example, a flat surface close to the central axis O and an inclined surface away from the central axis O. At this time, if the inclination of the bottom surface is continuously changed according to the distance from the central axis O, the recess 32 (its bottom surface) becomes a dome shape. As an example of the dome shape, a hemispherical dome shape, a Low dome shape, and a Tall dome shape can be mentioned. The hemispherical dome shape is a curved surface with a ratio (aspect ratio Rr = hr / Lr) of its depth hr to the outer diameter Lr of 0.5. The Low dome shape and the Tall dome shape are curved surfaces with an aspect ratio Rr less than 0.5 and greater than 0.5, respectively.

[0024] The diameter Lr means the maximum length of the bottom surface of the recess 32. That is, if the shape of the bottom surface is circular, the diameter Lr means its diameter. If the shape of the bottom surface is triangular, the diameter Lr means the length of its side. If the shape of the bottom surface is a polygon with four or more sides, the diameter Lr means the length of its diagonal (the maximum length connecting the vertices).

[0025] In this way, by using the recess 32 of various shapes, the light converging function of the lens body 30 can be assisted , match and it can contribute to the reduction of the light angle θf.

[0026] The light converging member 10 having such a shape can be manufactured by a powder sintering method, press molding, injection molding, or machining. In the case of the powder sintering method, for example, a molding slurry containing a powder of quartz glass (silica powder) and an organic compound is poured into a mold. This slurry is solidified by a chemical reaction between the organic compounds, for example, a chemical reaction between the dispersion medium and the curing agent or between the curing agents, to form a molded body. The molded body is removed from the mold and fired. In this way, the light converging member 10 can be manufactured.

[0027] As for the dimensions of the light converging member 10, the height hc of the light converging member 10 is, for example, 0.7 to 30 [mm]. The outer diameter Da and the height hl of the pedestal 28 are, for example, 3.0 to 100 [mm] and 0.2 to 1 [mm], respectively. The lens body 30 has a maximum diameter Lm, a maximum height hm, and an aspect ratio Rm of, for example, 1 to 20 [mm], 0.5 to 30.0 [mm], and 0.3 to 1.5, respectively.

[0028] The recess 32 has a diameter Lr, a depth hr, and an aspect ratio Rr of, for example, 0.1 to 5.0 [mm], 0.1 to 5.0 [mm], and 0.1 to 1.0, respectively.

[0029] The distance dr between the bottom surface 30a of the lens body 30 and the outer periphery of the recess 32 (here, the bottom surface of the pedestal 28) is, for example, 0 to 1.0 [mm].

[0030] The optical element 14 has a substantially rectangular parallelepiped shape (for example, a rectangular parallelepiped shape, a shape with chamfered edges of a rectangular parallelepiped), a substantially prismatic shape (for example, a prismatic shape (triangular prism, hexagonal prism, etc.), a shape with chamfered edges of a prism), and the shape in a top view is a rectangle (square, rectangle), a shape with chamfered edges of a rectangle, a triangle, or a hexagon.

[0031] The optical element 14 has a height (thickness) ht and a size Dt of, for example, 0.005 to 0.5 [mm] and 0.5 to 2.0 [mm], respectively.

[0032] The size Dt means the maximum length of the light emitting region when the optical element 14 is viewed from above. When the entire optical element 14 is emitting light, for example, if the shape of the optical element 14 in a top view is a polygon with four or more sides (for example, a square shape, a hexagonal shape), the size Dt means the length of its diagonal (the maximum length connecting the vertices). Also, when a part of the optical element 14 is emitting light, the maximum length of the light emitting region when viewed from above is taken as the size Dt.

[0033] The distance dt between the upper surface (light emitting surface, crystal layer forming surface 14a) of the optical element 14 and the outer periphery of the recess 32 (here, the bottom surface of the pedestal 28) is, for example, 0.05 to 1.0 [mm].

[0034] (Modification example) As shown in FIGS. 3 and 4, in the optical component 100 according to the modified example, the mounting substrate 18 does not have the accommodation space 26. The light converging member 10 has the accommodation space 26, and the concave portion 32 is disposed on the upper surface of the accommodation space 26. Therefore, the outer periphery of the concave portion 32 is flush with the bottom surface 30a of the lens body 30 (distance dr = 0).

[0035] Thus, even in the modified example in which the mounting substrate 18 does not have the accommodation space 26, similar to the embodiment, the concave portion 32 is used to assist the light converging function of the lens body 30 , match and can contribute to the reduction of the light angle θf.

Example

[0036] For Examples 1 to 18 and Comparative Examples 1 to 5, the light distribution angle θf (in some cases, the light extraction efficiency E and the illuminance I were also) was confirmed.

[0037] Basically, both the examples and the comparative examples can be represented by FIG. 1. In these examples and comparative examples, the shape, diameter Lr, and depth hr of the concave portion 32 were changed as follows (see Table 1).

[0038] Examples 1 to 11 and Comparative Examples 2 to 4 were hemispherical domes, Examples 12 and 13 were Low domes, Examples 14 to 17 and Comparative Example 5 were Tall domes, and Example 18 was cylindrical. Comparative Example 1 does not have the concave portion 32.

[0039] The hemispherical dome shape has an aspect ratio Rr (hr / Lr) of 0.5, the Low dome is smaller than 0.5, and the Tall dome is larger than 0.5.

[0040] The diameters Lr of Comparative Examples 2 to 4 and Examples 1 to 11 were changed to 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.6, 2.0, 2.4, 2.6 [mm] (the ratio (Lr / Dt) to the size Dt of the optical element 14 at this time was 0.27, 0.35, 0.44, 0.53, 0.62, 0.71, 0.80, 0.88, 0.97, 1.06, 1.41, 1.77, 2.12, 2.30).

[0041] In Examples 12 to 18 and Comparative Example 5, the diameter Lr was set to 1.1 [mm] (the ratio (Lr / Dt) was 0.97). The depths hr of Examples 12 to 17 and Comparative Example 5 were set to 0.275, 0.4, 0.7, 0.825, 0.9, 0.95, and 1 [mm], respectively (the aspect ratios Rr were 0.25, 0.36, 0.64, 0.75, 0.82, 0.86, and 0.91).

[0042] Except for the recess 32 (its shape, diameter Lr, and depth hr), both the examples and the comparative examples have the shapes shown in Table 2 and are made of quartz glass. That is, the light converging member 10 has a height hc of 2.47 [mm]. The lens body 30 has a Tall lens shape, a maximum diameter Lm of 3.2 [mm], a maximum height hm of 1.97 [mm], and an aspect ratio Rm (hm / Lm) of 0.62.

[0043] For the recess 32, the outer peripheral curvature radius Ra was 0.1 [mm], the distance dr was 0.5 [mm], and the distance dt was 0.4 [mm].

[0044] The pedestal 28 had a height hl of 0.5 [mm] and an outer diameter Da of 3.5 [mm]. The accommodation space 26 was arranged on the mounting substrate 18, had a cylindrical shape, an outer diameter Dk of 2.5 [mm], and a height hk of 0.5 [mm].

[0045] The optical element 14 was an LED chip, had a rectangular parallelepiped shape (quadrilateral shape when viewed from above), a size Dt of 1.1 [mm] (the length of one side of the quadrilateral: 0.8 [mm]), and a height ht of 0.1 [mm].

[0046] The light distribution characteristics, light distribution angle θf, light extraction efficiency E, and illuminance I of the optical components according to the examples and comparative examples according to were confirmed by simulation (ray tracing method).

[0047] [Simulation Results] The light distribution angle θf, light extraction efficiency E, and illuminance I of the optical components according to the examples and comparative examples are shown in Table 1.

[0048] The light distribution angle θf refers to the angular width at which the luminous intensity becomes 1 / 2 of the maximum luminous intensity in the angular distribution of the luminous intensity (see Fig. 7). The light extraction efficiency E refers to the ratio of the light output emitted outside the optical component to the light output emitted from the LED chip. The illuminance I indicates the relative value of the illuminance in the direction parallel to the central axis O (angle θ = 0).

[0049] Fig. 8 is a graph showing the relationship between the diameter Lr of the recess 32 and the light distribution angle θf, and summarizes the results of Comparative Examples 1 to 4 and Examples 1 to 11.

[0050] As shown in this graph, the diameter Lr of the recess 32 (size ratio (Lr / Dt) with the optical element 14) has a great influence on the light distribution angle θf. From the viewpoint of a small light distribution angle θf, the diameter Lr is preferably 0.55 to 1.6 [mm] (size ratio (Lr / Dt) is 0.5 to 1.5), and more preferably 0.6 to 1.0 [mm] (size ratio (Lr / Dt) is 0.5 to 0.9).

[0051] Fig. 9 is a graph showing the relationship between the depth hr of the recess 32 and the light distribution angle θf (and the illuminance I), and summarizes the results of Comparative Example 1, 5, and Examples 6, 12 to 17.

[0052] As shown in this graph, the depth hr of the recess 32 (aspect ratio Rr (= hr / Lr)) has a great influence on the light distribution angle θf and the illuminance I. The depth hr is preferably 0.275 to 0.95 [mm] (aspect ratio Rr is 0.25 to 0.86), and more preferably 0.275 to 0.7 [mm] (aspect ratio Rr is 0.25 to 0.64). If it exceeds the former range, the light distribution angle θf becomes large, and if it is within the latter range, the illuminance / light distribution angle ratio (I / θf) can be increased (the light distribution angle θf is small and the illuminance I is large).

[0053] As can be seen from comparing Comparative Example 1, Example 1, Example 6, and Example 18, the shape of the concave portion 32 is not limited to a hemispherical dome. Even when it has a cylindrical shape, good results were obtained for both the light distribution angle θf and the light extraction efficiency E as compared to the case where there is no concave portion 32 (Comparative Example 1). That is, the concave portion 32 can have any shape among a hemispherical dome, a Low dome, a Tall dome, and a cylinder. Also, it can be inferred that even in the case of a prism, a cone, or a pyramid, it is better than the case where there is no concave portion 32 (Comparative Example 1).

[0054] As shown by these results, the light converging member 10 is useful for reducing the light distribution angle θf. small to useful.

[0055] [Invention Obtained from the Present Embodiment] The invention that can be grasped from the above embodiment will be described below.

[0056] [1] The light converging member (10) according to the present embodiment is used for an optical component (100) having an optical element (14) that emits light, faces the optical element (14), and has a concave portion (32) having a size of 0.5 times or more the maximum length of the light emitting region in the optical element (14), and a lens body (30) that converges the light passing through the concave portion (32). Thereby, it is possible to achieve both a reduction in the light distribution angle (θf) and miniaturization of the light source. For example, a light distribution angle (θf) of 17° or less can be obtained.

[0057] [2] In the present embodiment, it is preferable that the concave portion (32) has a size of 1.5 times or less the maximum length of the light emitting region in the optical element (14), and more preferably a size of 0.9 times or less the maximum length of the light emitting region in the optical element (14). Thereby, further reduction of the light distribution angle (θf) can be achieved.

[0058] [3] In the present embodiment, the ratio (aspect ratio Rr) of the depth (hr) to the diameter (Lr) of the concave portion (32) is 0.25 to 0.86. If it is outside this range, the light distribution angle (θf) may increase.

[0059] [4] In this embodiment, the ratio (aspect ratio Rr) of the depth (hr) to the diameter (Lr) of the concave portion (32) is 0.25 to 0.64. Thereby, the ratio (I / θf) of the illuminance (I) to the light distribution angle (θf) can be increased (convergence of strong light (illuminance I) to a narrow light distribution angle θf). When the aspect ratio (Rr) is less than 0.25, the light distribution angle (θf) becomes large, and when the aspect ratio (Rr) is greater than 0.64, the illuminance (I) may become small.

[0060] [5] In this embodiment, the concave portion (32) has any one of the shapes of a dome, a cylinder, a prism, a cone, and a pyramid. Regardless of the shape, reduction of the light distribution angle (θf) can be achieved. Among these, it is preferable that the concave portion (32) is dome-shaped.

[0061] [6] In this embodiment, the light converging member (10) includes an annular pedestal (28) that is fixed on the mounting substrate (18) and integrally formed with the lens body (30). Thereby, fixation to the mounting substrate (18) becomes easy.

[0062] [7] In this embodiment, the light converging member (10) has an accommodation space (26) that accommodates the optical element (14), and the concave portion (32) is formed on the bottom surface of the accommodation space (26). Thereby, an inexpensive flat substrate can be used for the mounting substrate (18).

[0063] [8] The optical component (100) according to this embodiment includes at least one optical element (14) that emits light, a concave portion (32) that faces the optical element (14) and has a size of 0.5 times or more the maximum length of the light emitting region in the optical element (14), and a light converging member (10) that has a lens body (30) that converges the light that has passed through the concave portion (32). Thereby, reduction of the light distribution angle (θf) can be achieved.

[0064] Note that the light converging member and the optical component according to the present invention are not limited to the above-described embodiments, and various configurations can be adopted without departing from the gist of the present invention.

Claims

1. An optical focusing member (10) used for an optical component (100) having an optical element (14) that emits light, A concave portion (32) facing the optical element (14) and having a diameter (Lr) that is 0.5 times or more the maximum length (Dt) of the light-emitting region in the optical element (14), A lens body (30) that converges the light emitted from the optical element (14), comprising, The ratio (aspect ratio Rr) of the depth (hr) to the diameter (Lr) of the concave portion (32) is 0.25 to 0.86, The ratio (aspect ratio Rm = hm / Lm) of the maximum height (hm) to the maximum diameter (Lm) of the lens body (30) is greater than 0.5, The optical element (14) is disposed outside the concave portion (32), and a gap of a constant distance (dt) is provided in the normal direction of the upper surface of the optical element (14) between the upper surface of the optical element (14) and the outer periphery of the concave portion (32). The relative value of the light distribution angle (θf) (the light distribution angle (θf) when the concave portion (32) is provided / the light distribution angle (θf) when the concave portion (32) is not provided) is 93% or less. An optical focusing member.

2. An optical focusing member (10) used for an optical component (100) having an optical element (14) that emits light, A concave portion (32) facing the optical element (14) and having a diameter (Lr) that is 0.5 times or more the maximum length (Dt) of the light-emitting region in the optical element (14), A lens body (30) that converges the light emitted from the optical element (14), comprising, The ratio (aspect ratio Rr) of the depth (hr) to the diameter (Lr) of the concave portion (32) is 0.25 to 0.86, The ratio (aspect ratio Rm = hm / Lm) of the maximum height (hm) to the maximum diameter (Lm) of the lens body (30) is greater than 0.5, The optical element (14) is disposed outside the concave portion (32), and a gap with a constant distance (dt) is provided in the normal direction of the upper surface of the optical element (14) between the upper surface of the optical element (14) and the outer periphery of the concave portion (32). The light-converging member has a light distribution angle (θf) of 17° or less.

3. In the light-converging member according to Claim 1, The light-converging member, wherein the light distribution angle (θf) (the light distribution angle (θf) when the concave portion (32) is provided) is 17° or less.

4. In the light-converging member according to Claim 1 or 3, The light-converging member, wherein the relative value of the light distribution angle (θf) is 59 to 93%.

5. In the light-converging member according to Claim 4, The light-converging member, wherein the relative value of the light distribution angle (θf) is 59 to 70%.

6. In the light-converging member according to any one of Claims 1 to 5, The light-converging member, wherein the light distribution angle (θf) is 10.4° or more and 16.4° or less.

7. In the light-converging member according to Claim 6, The light-converging member, wherein the light distribution angle (θf) is 10.4° or more and 12.2° or less.

8. In the light-converging member according to any one of Claims 1 to 7, The light-converging member, wherein the diameter (Lr) of the concave portion (32) is 1.5 times or less the maximum length (Dt) of the light-emitting region in the optical element (14).

9. In the light-converging member according to Claim 8, The light-converging member, wherein the diameter (Lr) of the concave portion (32) is 0.9 times or less the maximum length (Dt) of the light-emitting region in the optical element (14).

10. In the light-converging member according to any one of Claims 1 to 9, The light converging member, wherein a ratio (aspect ratio Rr) of a depth (hr) to a diameter (Lr) of the concave portion (32) is 0.25 to 0.

64.

11. In the light converging member according to any one of Claims 1 to 10, The light converging member, wherein the concave portion (32) has any one of a dome shape, a cylinder, a prism, a cone, and a pyramid.

12. In the light converging member according to Claim 11, The light converging member, wherein the concave portion (32) is dome-shaped.

13. In the light converging member according to any one of Claims 1 to 12, having an accommodation space (26) for accommodating the optical element (14), The light converging member, wherein the concave portion (32) is formed on a bottom surface of the accommodation space.

14. At least one optical element (14) that emits light, A light converging member (10) having a concave portion (32) that faces the optical element (14) and has a diameter (Lr) that is 0.5 times or more the maximum length (Dt) of a light emitting region in the optical element (14), and a lens body (30) that converges light emitted from the optical element (14), comprising a ratio (aspect ratio Rr) of a depth (hr) to a diameter (Lr) of the concave portion (32) is 0.25 to 0.86, a ratio (aspect ratio Rm = hm / Lm) of a maximum height (hm) to a maximum diameter (Lm) of the lens body (30) is greater than 0.5, the optical element (14) is disposed outside the concave portion (32), and a gap having a constant distance (dt) is provided in a normal direction of the upper surface of the optical element (14) between the upper surface of the optical element (14) and an outer periphery of the concave portion (32), An optical component (100), wherein a relative value of a light distribution angle (θf) (light distribution angle (θf) when the concave portion (32) is provided / light distribution angle (θf) when the concave portion (32) is not provided) is 93% or less.

15. at least one optical element (14) that emits light; a light converging member (10) having a concave portion (32) facing the optical element (14) and having a diameter (Lr) of 0.5 times or more the maximum length (Dt) of the light emitting region in the optical element (14), and a lens body (30) that converges the light emitted from the optical element (14); comprising the ratio (aspect ratio Rr) of the depth (hr) to the diameter (Lr) of the concave portion (32) is 0.25 to 0.86; the ratio (aspect ratio Rm = hm / Lm) of the maximum height (hm) to the maximum diameter (Lm) of the lens body (30) is greater than 0.5; the optical element (14) is disposed outside the concave portion (32), and a gap of a constant distance (dt) is provided in the normal direction of the upper surface of the optical element (14) between the upper surface of the optical element (14) and the outer periphery of the concave portion (32); an optical component (100) in which the light distribution angle (θf) is 17° or less.

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