Light source device

Abstract

To radiate heat efficiently.SOLUTION: A light source device includes: a heat sink which has a plurality of tabular heat radiation fins arranged radially; and a light source part which has one or a plurality of LED light sources provided at each of the radiation fins. The heat radiation fin includes: a light source mounting part in which the LED light source is provided; and a fin body part provided at the upper side of the light source mounting part. When viewed along a first direction which is a thickness direction of the heat radiation fin, the fin body part includes an inclination part whose area becomes larger as it goes upward in the vertical direction, and the width of the light source mounting part is equal to or less than the width of a lower end of the fin body part. The LED light source is provided on the surface facing outside of the light source mounting part. When viewed along the first direction, the surface facing inside of the inclination part is along the vertical direction, and the surface facing outside of the inclination part is inclined with respect to the vertical direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a light source device. [Background technology]

[0002] Patent Document 1 discloses an illumination device in which a lens body is provided with a cylindrical body made of a thermally conductive material, the internal space of which serves as an air flow passage that passes through the lens body and communicates with the outside, a light source is attached to the outer peripheral surface of the cylindrical body facing the inner surface of the lens body, and a light source is also attached to a support member made of a thermally conductive material connected to the cylindrical body at a position facing the inner surface of the lens body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-99397 A Summary of the Invention [Problem to be solved by the invention]

[0004] The invention described in Patent Document 1 is an LED lighting device for general lighting or decorative purposes, and therefore the required light intensity is limited, and therefore the temperature rise of the LED element is also limited.

[0005] Navigational aids such as lighthouses and light beacons are required to be brighter than light source devices for general illumination or decoration. Generally, the brightness required of a light source device is proportional to the amount of heat generated by the light source device. Therefore, when it is required to irradiate strong light, such as light source devices used for navigational aids, the heat dissipation structure described in Patent Document 1 does not dissipate heat sufficiently, which may cause failure or early deterioration.

[0006] The present invention has been made in view of the above circumstances, and has an object to provide a light source device capable of efficiently dissipating heat. [Means for solving the problem]

[0007] In order to solve the above problems, the light source device of the present invention comprises, for example, a heat sink having a plurality of plate-shaped heat dissipation fins arranged radially, and a light source unit having one or more LED light sources provided on each of the heat dissipation fins, the heat dissipation fin having a light source mounting portion on which the LED light sources are provided, and a fin main body portion provided on the upper side of the light source mounting portion, when viewed along a first direction which is the thickness direction of the heat dissipation fin, the fin main body portion has an inclined portion whose area becomes wider as it extends vertically upward, the width of the light source mounting portion is less than or equal to the width of the lower end of the fin main body portion, the LED light source is provided on a surface facing outward of the light source mounting portion, when viewed along the first direction, the inward surface of the inclined portion is aligned along the vertical direction, and the outward surface of the inclined portion is inclined with respect to the vertical direction.

[0008] According to the light source device of the present invention, a heat sink has a plurality of plate-shaped heat dissipation fins arranged radially, a light source portion is provided on the light source mounting portion of the heat dissipation fin, and a fin body portion having an inclined portion whose area increases vertically upward is provided on the upper side of the light source mounting portion. The inclined portion increases the area of ​​the fin body portion without blocking the light emitted upward from the LED light source. In addition, since the heat dissipation fins are arranged radially, the amount of air between adjacent inclined portions increases vertically upward, making it difficult for the air to rise in temperature. This allows for efficient heat dissipation.

[0009] The heat sink may have a plurality of heat dissipation fins arranged radially to form a hollow space inside the plurality of heat dissipation fins, and a gap may be provided between adjacent heat dissipation fins, thereby preventing heat from being trapped in the hollow space and increasing the efficiency of heat dissipation.

[0010] The second heat dissipation section may include a fan provided below the heat sink and a cylindrical airflow straightening member provided above the fan, and the second heat dissipation section may blow air from below the light source attachment section toward the entire side surface of the light source attachment section. This increases the heat dissipation efficiency compared to heat dissipation by the heat sink alone.

[0011] The light source attachment part may be rod-shaped, the rectifying member may be provided in the vicinity of the lower end of the light source attachment part so as to surround a portion where the LED light source is not provided, and the rectifying member may have a tapered portion that is inclined so as to approach the heat dissipation fin as it approaches the LED light source. This allows the wind blown from the fan to directly hit the LED light source. Therefore, the LED light source, which is a heat source, can be directly cooled and heat can be efficiently dissipated. Effect of the Invention

[0012] According to the present invention, heat can be dissipated efficiently. [Brief description of the drawings]

[0013] [Figure 1] 1 is a perspective view showing an outline of a lamp 100 in which a light source device 1 is provided. [Diagram 2] 1A and 1B are diagrams showing an outline of a lamp 100 provided with a light source device 1, in which (A) is a front view and (B) is a cross-sectional view taken along the line AA of (A). [Diagram 3] FIG. 1 is a perspective view showing an outline of a light source device 1. [Figure 4] 1 is a front view showing an outline of a light source device 1. FIG. [Diagram 5] FIG. 2 is a perspective view showing an outline of a heat dissipation fin 11. [Figure 6] 1A and 1B are diagrams showing an outline of a heat dissipation fin 11, in which (A) is a diagram seen along the thickness direction, and (B) is a diagram seen along a direction perpendicular to the thickness direction. [Figure 7] 5A and 5B are diagrams showing an outline of a heat sink 10, in which (A) is a cross-sectional view taken along line BB in FIG. 4, and (B) is a cross-sectional view taken along line CC in FIG. [Figure 8]1A and 1B are diagrams showing an outline of a light source device 1A, in which (A) is a perspective view and (B) is a front view. [Figure 9] 8A and 8B are diagrams showing an outline of a heat sink 10A, where (A) is a cross-sectional view taken along line DD of FIG. 8B, and (B) is a cross-sectional view taken along line EE of FIG. 8B. [Figure 10] 1A and 1B are diagrams showing an outline of a light source device 1B, in which (A) is a plan view and (B) is a front view. [Figure 11] 10A and 10B are diagrams showing an outline of a heat sink 10B, where (A) is a cross-sectional view taken along line FF in FIG. 10B, and (B) is a cross-sectional view taken along line GG in FIG. 10B. [Figure 12] 1 is a perspective view showing an outline of a lamp 100A provided with a light source device 2. FIG. [Figure 13] FIG. 2 is a perspective view showing an outline of a light source device 2. [Figure 14] FIG. 2 is a front view showing an outline of the light source device 2. [Figure 15] FIG. 14B is a cross-sectional view taken along line JJ of FIG. [Figure 16] 13A is a perspective view showing an outline of a rectifying member 42A, and FIG. 13B is a perspective view showing an outline of a rectifying member 42B. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The light source device of the present invention is a light source device used in navigational aids, for example, lighthouses. For example, the light source device of the present invention emits light with an intensity of about 300,000 cd (candela) to 1.6 million cd. Note that a 40W fluorescent lamp for home use has an intensity of about 370 cd, and a halogen lamp for vehicles has an intensity of about 40,000 cd, and the light source device of the present invention emits light that is stronger than these lamps.

[0015] <First embodiment> Fig. 1 is a perspective view showing an outline of a lamp 100 provided with a light source device 1 according to a first embodiment of the present invention. Fig. 2 shows an outline of the lamp 100 provided with the light source device 1, where (A) is a front view and (B) is a cross-sectional view taken along line AA of (A). Note that hatching showing a cross section is omitted in Fig. 2(B).

[0016] The lighting device 100 is a lighting device used in a lighthouse, and mainly comprises a light source device 1 and a pair of lenses 101. The lens 101 on the front side is omitted in Fig. 1. For example, the lens 101 is provided on a base (not shown) and rotates at a constant speed.

[0017] The lens 101 is bowl-shaped and is provided so as to surround the light source device 1. The lens 101 has a Fresnel lens 101a provided at the bottom of the bowl shape. This allows the lens 101 to be thin, while narrowing the light irradiated from the light source device 1 and projecting it far away. The lens 101 also collects the light irradiated from the light source device 1 within a range of angle θ2 centered on the optical axis ax, and emits strong light (flash) in the direction along the optical axis ax.

[0018] Fig. 3 is a perspective view showing an outline of light source device 1. Fig. 4 is a front view (viewed from the -y direction) showing an outline of light source device 1. Hereinafter, the vertical direction is defined as the z direction, and the two orthogonal directions along the horizontal direction are defined as the x direction and the y direction.

[0019] The light source device 1 mainly includes a heat sink 10, a light source unit 20, and a base 30. The heat sink 10 is provided on the base 30, and the light source unit 20 is provided on the heat sink 10. In this embodiment, the base 30 is a metal plate, but the shape of the base 30 is not limited to this.

[0020] The heat sink 10 mainly includes a plurality of heat dissipation fins 11 and a mounting plate 12. The heat dissipation fins 11 and the mounting plate 12 are formed using metal. In this embodiment, the heat dissipation fins 11 and the mounting plate 12 are desirably made of copper, aluminum, or the like having high thermal conductivity. The upper ends (ends on the +z side) of the plurality of heat dissipation fins 11 are provided on the mounting plate 12, and the lower ends (ends on the -z side) are provided on the base 30. In this embodiment, the heat dissipation fins 11 are provided on the mounting plate 12 and the base 30 by screws 19, but the method of attaching the heat dissipation fins 11 is not limited to this.

[0021] The mounting plate 12 has a hole 12a formed at a position overlapping with a hollow portion 10a (described in detail later) of the heat sink 10 in a plan view (when viewed from the +z direction). The hole 12a connects the hollow portion 10a with the space outside the heat sink 10.

[0022] Fig. 5 is a perspective view showing an outline of the heat dissipating fin 11. Fig. 6 shows an outline of the heat dissipating fin 11, where (A) is a view seen along the thickness direction of the heat dissipating fin 11 and (B) is a view seen along a direction perpendicular to the thickness direction of the heat dissipating fin 11. Hereinafter, the thickness direction of the heat dissipating fin 11 is defined as the u direction (corresponding to the first direction of the present invention), and the direction perpendicular to the u direction and the z direction is defined as the v direction.

[0023] The heat dissipation fin 11 is plate-shaped and mainly includes a light source attachment portion 11a, a fin body portion 11b, and an attachment portion 11c. The light source attachment portion 11a is rod-shaped and is provided with its longitudinal direction aligned along the vertical direction. The attachment portion 11c is provided below the light source attachment portion 11a, but the attachment portion 11c is not essential.

[0024] The fin body 11b is plate-shaped and provided on the upper side of the light source attachment portion 11a. The light source attachment portion 11a and the fin body 11b, that is, the inner surface 11h of the heat dissipation fin 11, are aligned along the vertical direction (z direction).

[0025] When viewed along the u direction, the fin body 11b has an inclined portion 11d whose area increases vertically upward (in the +z direction), and a non-inclined portion 11e provided above the inclined portion 11d. However, the non-inclined portion 11e is not essential. The inclined portion 11d has an inclined surface 11f that is inclined with respect to the vertical direction. In the heat sink 10, the heat dissipation fins 11 are arranged so that the inclined surface 11f faces outward.

[0026] As shown in Fig. 6(A), the width w of the light source attachment portion 11a when viewed along the u direction (width in the v direction) is equal to or smaller than the width of the lower end of the fin main body portion 11b. In this embodiment, the width w is the same as the width of the lower end of the fin main body portion 11b. As shown in Fig. 6(B), the thickness t of the heat dissipation fin 11 (width in the u direction) is constant.

[0027] The heat dissipation fin 11 is not limited to the shape shown in the figure. For example, the light source attachment portion 11a is a square bar shape, but the light source attachment portion 11a may be a round bar shape, a round bar shape with a D-cut, or a polygonal shape such as a triangle or hexagon in a plane perpendicular to the longitudinal direction. The width w may be equal to or greater than the width t. The shape of the fin main body portion 11b is also not limited to this. For example, the fin main body portion 11b may be a right-angled triangle shape or an isosceles triangle shape when viewed along the thickness direction. However, it is preferable that the fin main body portion 11b has an inclined portion 11d whose area becomes wider as it goes vertically upward (in the +z direction).

[0028] Returning to the explanation of Figs. 3 and 4, the light source unit 20 mainly includes an LED light source 21 and a plate-shaped member 22. The plate-shaped member 22 is formed using a metal. In this embodiment, the plate-shaped member 22 is desirably made of copper, aluminum, or the like having high thermal conductivity. A plurality of LED light sources 21 are provided on the plate-shaped member 22. The plate-shaped member 22 may also be provided with a substrate or the like including a control unit that drives the LED light source 21.

[0029] In this embodiment, the LED light sources 21 are arranged along the z direction. A plate-shaped member 22 is provided on a surface 11g (see FIGS. 5 and 6) facing outward of the light source attachment portion 11a, so that the LED light sources 21 are provided on the surface 11g via the plate-shaped member 22.

[0030] In the present embodiment, a plurality of (for example, nine) LED light sources 21 are provided on the plate-shaped member 22, but the number of LED light sources 21 is not limited to this. For example, one LED light source 21 may be provided on the plate-shaped member 22.

[0031] Since the plate-like member 22 is made of metal, the heat generated by the LED light source 21 is transferred to the heat dissipation fins 11 (light source attachment portion 11a) via the plate-like member 22. In addition, since the heat dissipation fins 11 are made of metal, the heat transferred to the light source attachment portion 11a is transferred to the fin main body portion 11b.

[0032] Fig. 7(A) is a cross-sectional view taken along line BB in Fig. 4, and Fig. 7(B) is a cross-sectional view taken along line CC in Fig. 4. As shown in Fig. 7, the heat dissipating fins 11 are arranged radially. The heat dissipating fins 11 are also spaced apart from one another.

[0033] In the heat sink 10, a plurality of heat dissipation fins 11 are arranged radially, so that a hollow portion 10a is formed inside the plurality of heat dissipation fins 11. An inner surface 11h of the heat dissipation fin 11 faces the hollow portion 10a. In addition, a gap 10b is formed between adjacent heat dissipation fins 11. The gap 10b connects the hollow portion 10a to a space 10c outside the hollow portion 10a.

[0034] Furthermore, by arranging the heat dissipation fins 11 radially, the surface 11g, i.e., the LED light source 21, is provided facing outward on the circle c. Therefore, the LED light source 21 can radiate light radially, i.e., in all directions.

[0035] In addition, since the light source mounting portion 11a is rod-shaped, the circle c (see FIG. 7(B)) passing through the surface 11g becomes smaller, that is, the distance between adjacent LED light sources 21 becomes shorter. This allows the light source mounting portion 11a of the heat sink 10 to be made smaller.

[0036] As shown in Fig. 6, when viewed along the u direction, the width w of the light source attachment portion 11a is equal to or less than the width of the lower end of the fin main body portion 11b, and the fin main body portion 11b is cut out by the inclined portion 11d, so that the light irradiated upward from the LED light source 21 is not blocked by the heat dissipation fin 11. Since the inclination of the inclined portion 11d with respect to the z direction is θ1 (see Fig. 6(A)), the light irradiated over a wide angle θ1 range from the horizontal plane is concentrated on the lens 101, as shown in Fig. 2(A). Therefore, the lamp 100 can effectively use the light from the light source device 1.

[0037] Returning to the explanation of Figs. 3 and 4, the heat generated by the LED light source 21 is transferred to the fin body 11b via the plate-like member 22 and the light source attachment portion 11a. Since the fin body 11b is plate-like, the heat is diffused over a wide area, and the heat dissipation efficiency is increased. Also, since the heat dissipation fins 11 are arranged radially, the amount of air between adjacent inclined portions 11d increases in the +z direction, which makes it difficult for the air temperature to rise, and therefore heat can be dissipated efficiently. Also, when the air temperature rises due to heat dissipation, the air with a higher temperature moves upward, but since the amount of air between adjacent inclined portions 11d increases in the +z direction, it is possible to prevent a decrease in the efficiency of heat dissipation due to the temperature rise.

[0038] Since the mounting plate 12 has the holes 12a, the heat in the hollow portion 10a can be easily dissipated to the outside of the heat sink 10. In addition, since there is a gap 10b that connects the hollow portion 10a to the space 10c, heat is not trapped in the hollow portion 10a, and the efficiency of heat dissipation can be improved.

[0039] According to this embodiment, the heat dissipation fins 11, each having an inclined portion 11d whose area increases vertically upward, are radially arranged above the light source attachment portion 11a on which the LED light source 21 is provided, so that heat can be dissipated efficiently without blocking the light emitted from the LED light source 21. Therefore, sufficient heat dissipation can be achieved even in the light source device 1 that requires a high luminous flux, such as that used in a navigation aid.

[0040] Furthermore, according to this embodiment, the heat dissipation fins 11 are provided at intervals to form the gaps 10b, thereby making it possible to increase the heat dissipation efficiency.

[0041] In this embodiment, the mounting plate 12 is provided with the holes 12a, but since there are gaps 10b between the adjacent heat dissipation fins 11, the holes 12a are not essential.

[0042] In the present embodiment, the hole 12a is provided in the mounting plate 12, but the form of the mounting plate 12 is not limited to this. For example, a plurality of holes may be provided at a position overlapping with the space 10c in a plan view.

[0043] In the present embodiment, the light source attachment portion 11a is rod-shaped, but the shape of the light source attachment portion 11a is not limited to this. For example, when only one LED light source 21 is provided on the light source attachment portion 11a, the light source attachment portion 11a may be short, and in this case, the light source attachment portion 11a does not have a rod shape.

[0044] <Modification 1 of the First Embodiment> In the light source device 1 according to the first embodiment, the heat sink 10 has ten heat dissipation fins 11, but the number of heat dissipation fins 11 of the heat sink 10 is not limited to ten. Fig. 8 is a diagram showing an outline of a light source device 1A having a heat sink 10A according to a modified example, (A) being a perspective view and (B) being a front view. The light source device 1A mainly has a heat sink 10A, a light source unit 20, and a base 30.

[0045] The heat sink 10A mainly includes five heat dissipation fins 11 and an attachment plate 12. On a surface 11g of a light source attachment portion 11a of each heat dissipation fin 11, a light source portion 20 is provided.

[0046] FIG. 9(A) is a DD cross-sectional view of FIG. 8(B), and FIG. 9(B) is an EE cross-sectional view of FIG. 8(B). As shown in FIG. 9, the heat dissipation fins 11 are arranged radially. The heat dissipation fins 11 are provided at intervals from each other. A gap 10d is formed between adjacent heat dissipation fins 11. The gap 10d connects the hollow portion 10a to a space 10e outside the hollow portion 10a. The heat dissipation fins 11 are arranged radially, so that the surface 11g, i.e., the LED light source 21, faces outward along the circle c.

[0047] In this way, the light source device 1A can also dissipate heat efficiently without blocking the light emitted from the LED light sources 21.

[0048] <Modification 2 of the First Embodiment> In the light source device 1 according to the first embodiment, the heat sink 10 has the gap 10b, but the gap 10b is not essential. Fig. 10 is a diagram showing an outline of a light source device 1B having a heat sink 10B according to a modified example, (A) being a plan view and (B) being a front view. The light source device 1B mainly has a heat sink 10B, a light source unit 20, and a base 30.

[0049] Fig. 11(A) is a cross-sectional view taken along line FF in Fig. 10(B), and Fig. 11(B) is a cross-sectional view taken along line GG in Fig. 10(B). The heat sink 10B has a cylindrical portion 13 that connects radiation fins 11A arranged radially. The radiation fins 11A are similar to the radiation fins 11 except that they are connected to the cylindrical portion 13. In a plan view, holes 12a are provided in the cylindrical portion 13 at positions overlapping with the hollow portion 10a.

[0050] Furthermore, the heat dissipation fins 11A are arranged radially, so that the surface 11g, that is, the LED light source 21, faces outward along the circle c.

[0051] In this way, in the light source device 1B, the heat dissipation fins 11A having inclined portions 11d whose area increases vertically upward are arranged radially, so that heat can be dissipated efficiently without blocking the light irradiated from the LED light source 21.

[0052] <Second embodiment> In the light source device 1 according to the first embodiment of the present invention, heat is dissipated using a heat sink 10 which is a heat dissipation member, but the heat dissipation efficiency can be further improved by using a fan. A light source device 2 according to a second embodiment will be described below. Note that the same parts as those in the light source device 1 according to the first embodiment are given the same reference numerals and description thereof will be omitted.

[0053] Fig. 12 is a perspective view showing an outline of a lamp 100A provided with a light source device 2 according to a second embodiment of the present invention. As in the first embodiment, the lamp 100A is a lamp used in a lighthouse, and mainly comprises a light source device 2 and a pair of bowl-shaped lenses 101. In Fig. 12, the lens 101 on the near side is omitted.

[0054] Fig. 13 is a perspective view showing an outline of the light source device 2. Fig. 14 is a front view (viewed from the -y direction) showing an outline of the light source device 2. The light source device 2 mainly has a heat sink 10, a light source unit 20, a base 30A, and a heat dissipation unit 40. The base 30A has two plate-like members 31 and 32, and the heat sink 10 (heat dissipation fins 11) is provided on the plate-like member 31.

[0055] The heat dissipation section 40 mainly has a fan 41 and a straightening member 42. The fan 41 is provided between the plate-like member 31 and the plate-like member 32, i.e., below the heat sink 10. The fan 41 blows air from the below of the heat sink 10 toward the heat sink 10.

[0056] The rectifying member 42 is provided on the plate-shaped member 31 so as to be located above the fan 41. The rectifying member 42 is cylindrical and provided in the vicinity of the lower end of the light source attachment portion 11a so as to surround a portion where the LED light source 21 is not provided.

[0057] The flow straightening member 42 has four plate-shaped members 42b. The plate-shaped members 42b are provided on each side of the plate-shaped member 31. The plate-shaped members 42b have a first flat portion 42c along the vertical direction (z direction) and a second flat portion 42d inclined with respect to the vertical direction. The four second flat portions 42d form a tapered portion 42a. Note that in the flow straightening member 42 of the present embodiment, minute gaps are formed between adjacent plate-shaped members 42b, and this case is also included in the cylindrical shape of the present invention.

[0058] The tapered portion 42a, i.e., the second flat portion 42d, is inclined so as to approach the heat dissipation fins 11 toward the upper end. Therefore, the tapered portion 42a becomes smaller in the hollow portion of the rectifying member 42 toward the upper end. Therefore, the rectifying member 42 prevents the light emitted from the LED light source 21 from being blocked.

[0059] The HH cross-sectional view in Fig. 14(A) is the same as the BB cross-sectional view (Fig. 7(A)) in Fig. 4, and the II cross-sectional view in Fig. 14(A) is the same as the CC cross-sectional view (Fig. 7(B)) in Fig. 4. The heat dissipation fins 11 are provided radially and spaced apart from one another.

[0060] Fig. 15 is a cross-sectional view taken along line JJ of Fig. 14(A) In Fig. 15, the illustration of the heat dissipating fins 11 and the hatching showing the cross section are omitted.

[0061] The plate-like member 31 has holes 31a, 31b, and 31c. The hole 31a is a hole through which a screw 19 (see FIG. 14) for fixing the heat dissipation fin 11 passes. The holes 31b and 31c are holes through which the air blown from the fan 41 passes and guides the air to the heat dissipation fin 11. In plan view, the hole 31b is provided at a position overlapping with the hollow portion 10a. In plan view, the hole 31c is provided at a position overlapping with the fin main body portion 11b.

[0062] Returning to the description of FIG. 14, the flow of air is indicated by a two-dot chain line in FIG. 14. The air blown by the fan 41 passes through the hole 31b and is guided to the hollow portion 10a. This air cools the light source mounting portion 11a from the inside (hollow portion 10a). The air blown into the hollow portion 10a cools the side surface of the light source mounting portion 11a by passing through the gap 10b (see FIG. 7(B)). In this way, the fan 41 blows air from the lower side of the light source mounting portion 11a toward the entire side surface of the light source mounting portion 11a. The side surface of the light source mounting portion 11a includes a surface 11h facing the hollow portion 10a and a surface 11i adjacent to the surface 11h (see FIGS. 5 to 7).

[0063] In addition, the air blown by the fan 41 passes through the holes 31c, is rectified inward by the tapered portion 42a, and directly hits the outside of the light source attachment portion 11a, i.e., the light source portion 20. This directly cools the LED light source 21, which is the source of heat.

[0064] In addition, the wind that passes through holes 31c hits fin main body portion 11b, particularly side surfaces 11j and inclined surfaces 11f (see Figures 5 to 7) on both sides of fin main body portion 11b, thereby cooling fin main body portion 11b, thereby improving the efficiency of heat dissipation from fin main body portion 11b.

[0065] According to this embodiment, the heat dissipation section 40 blows air from the underside of the light source mounting section 11a toward the entire side surface of the light source mounting section 11a, thereby improving the heat dissipation efficiency compared to the case where heat is dissipated only by the heat sink 10 (light source device 1), and sufficient heat dissipation can be achieved even in the light source device 2 which requires a high luminous flux, such as that used in navigation aids.

[0066] Furthermore, according to this embodiment, heat dissipating fins 11 are provided at intervals to form gaps 10b, so that air blown from fan 41 flows more smoothly, and heat dissipation efficiency can be improved.

[0067] Furthermore, in this embodiment, since the rectifying member 42 has the tapered portion 42a, the air passing through the holes 31c can be directly blown onto the LED light source 21, thereby directly cooling the LED light source 21 which is the source of heat generation.

[0068] In this embodiment, since the plate-shaped member 31 is a plate having a rectangular shape in a plan view, the rectifying member 42 has four plate-shaped members 42b, but the shape of the plate-shaped member 31 and the rectifying member 42 is not limited to this. For example, the rectifying member 42 may be a continuous cylinder without any breaks. For example, as shown in FIG. 16(A), the plate-shaped member 31A may be a plate having a circular shape in a plan view, and the rectifying member 42A may be a cylindrical shape. In this case, the tapered portion 42e may be a truncated cone shape inclined so as to approach the heat dissipation fin 11 toward the upper end (as it approaches the LED light source 21). Also, for example, as shown in FIG. 16(B), the plate-shaped member 31B may be a plate having a hexagonal shape in a plan view, the rectifying member 42B may be a hexagonal cylindrical shape, and the tapered portion 42f may be a hexagonal truncated pyramid shape inclined so as to approach the heat dissipation fin 11 toward the upper end. Also, the rectifying member may be a rectangular cylinder shape or a truncated pyramid shape other than a square or hexagonal shape.

[0069] In the present embodiment, the rectifying member 42 has the tapered portion 42a, but the tapered portion 42a is not essential. Even if the rectifying member does not have the tapered portion 42a, it is possible to send air from the lower side of the light source attachment portion 11a toward the entire side surface of the heat dissipation fin 11.

[0070] Although the embodiment of the present invention has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like within the scope of the gist of the present invention are also included. In addition, in the present invention, "approximately" is a concept that includes not only cases where something is strictly the same, but also errors and deformations to the extent that the identity is not lost. In addition, in the present invention, "nearby" means including a certain range (which can be arbitrarily determined) near a reference position. For example, in the case of "near the end," it is a concept that indicates a certain range of an area near the end, which may or may not include the end. [Explanation of symbols]

[0071] 1, 1A, 1B, 2: Light source device 10, 10A, 10B: Heat sink 10a: Hollow part 10b, 10d: gap 10c, 10e: Space 11, 11A: Heat dissipation fin 11a: Light source mounting part 11b: Fin body 11c: Mounting part 11d: Inclined part 11e: Non-slope section 11f: Inclined surface 11g, 11h, 11i: Surface 11j: Side 12: Mounting plate 12a:hole 13: Cylindrical part 19: Screw 20: Light source section 21:LED light source 22: Plate-shaped member 30, 30A: Base 31, 31A, 32 Plate-shaped members 31a, 31b, 31c: Hole 40: Heat dissipation part 41: Fan 42, 42A, 42B: Straightening member 42a, 42e, 42f: Tapered portion 42b: Plate-shaped member 42c: 1st plane part 42d: 2nd plane part 100, 100A: Light equipment 101: Lens 101a: Fresnel lens

Claims

1. a heat sink having a plurality of plate-shaped heat dissipation fins arranged radially; a light source unit having one or more LED light sources provided on each of the heat dissipation fins; Equipped with The heat dissipation fin has a light source attachment portion on which the LED light source is provided and a fin main body portion provided on an upper side of the light source attachment portion, When viewed along a first direction which is a thickness direction of the heat dissipation fin, the fin main body has an inclined portion whose area increases toward the vertically upward direction, and a width of the light source attachment portion is equal to or smaller than a width of a lower end of the fin main body, The LED light source is provided on an outwardly facing surface of the light source mounting portion, When viewed along the first direction, an inwardly facing surface of the inclined portion is aligned along the vertical direction, and an outwardly facing surface of the inclined portion is inclined with respect to the vertical direction. A light source device characterized by:

2. The heat sink has a plurality of heat dissipation fins arranged radially to form a hollow portion inside the plurality of heat dissipation fins, There is a gap between adjacent heat dissipation fins.

2. The light source device according to claim 1.

3. a second heat dissipation section including a fan provided below the heat sink and a cylindrical airflow straightening member provided above the fan; The second heat dissipation section blows air from a lower side of the light source attachment section toward the entire side surface of the light source attachment section.

3. The light source device according to claim 1, wherein the light source device is a light source unit.

4. The light source attachment portion is rod-shaped, the rectifying member is provided in the vicinity of a lower end of the light source attachment portion so as to surround a portion where the LED light source is not provided, The rectifying member has a tapered portion that is inclined so as to approach the heat dissipation fins as it approaches the LED light source.

4. The light source device according to claim 3.

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