JP2024016379A - Lighting device - Google Patents

Abstract

To provide a lighting device which does not cause glare when a lens is viewed from the front side, by emitting light emitted from an LED light source to the side.SOLUTION: A lighting device includes a light source 1, a first lens 3, a second lens 4, and an air layer 17 provided between the lenses. The first lens 3 includes: a conically concaved first reflection surface 9 including a first incident surface 6 formed at the bottom part in parallel with a light source emission surface 33, a light refraction surface 8 for refracting a portion of light entered from the first incident surface 6 to the side of the second lens 4, and a light reflection surface 7 located adjacent to the outside of the light refraction surface 8 for reflecting a portion of light incident from the first incident surface 6 to the side; and a first emission surface 11 for emitting light reflected by the light reflection surface 7 to the side. The second lens 4 includes: a second incident surface 12 arranged in parallel to the first incident surface 6 for accepting light emitted from the light refraction surface 8; a second reflection surface 13 concaved in conical shape for reflecting light entered from the second incident surface 12 to the side; and a second emission surface 14 for emitting light reflected by the second reflection surface 13 to the side.SELECTED DRAWING: Figure 2

Description

The present invention relates to a lighting device that reflects light in the optical axis direction of a light source and emits the light laterally.

The LED light source has a directional light emission distribution and emits light strongly upward. Conventionally, as a lighting device that emits light from an LED light source laterally, a lighting device that covers the LED light source with a lens and uses reflection from the lens to direct the light in a direction perpendicular to the optical axis is known. However, even if the design is such that the light rays emitted from the center of the LED light source are totally reflected by a single reflective surface, some of the light rays emitted from other parts of the LED light source are not totally reflected by the reflective surface and leak upward. However, there was a problem in that the lens caused glare when viewed from the front. Patent Document 1 discloses an illumination device in which two reflective surfaces are stacked in the optical axis direction. By providing a second reflective surface above the first reflective surface, even if the light emitted from the LED light source passes through the first reflective surface, the second reflective surface It can be reflected and directed to the side.

Japanese Patent Application Publication No. 2015-159075

However, in the lighting device described in Patent Document 1, the incident surface of the second lens is at approximately the same height as the upper end of the first lens, and the light incident on the second lens is Because the refracting position was far from the light source, some of the refracted light was totally reflected at the output surface of the second lens, rather than at the reflective surface. Since the light that is totally reflected at the output surface is incident on the reflective surface at an angle smaller than the critical angle, it is refracted and exits from the reflective surface as it is. For this reason, there was a problem in that the lens caused glare when viewed from the front side.

The present invention has been made in view of the above circumstances, and provides an illumination device that emits light emitted from an LED light source to the side and does not cause glare when the lens is viewed from the front side. .

The lighting device according to the present invention includes a light source and a lens group disposed on the side of the light source output surface which is a planar area in the light emitting part of the light source, and the lens group includes a first lens disposed on the light source side. , a lighting device comprising: a second lens disposed on the opposite side of the light source via the first lens; and an air layer provided between the first lens and the second lens, wherein the first lens is , a first entrance surface parallel to the light source exit surface, which is formed at the bottom of the first lens on the light source side, into which the light emitted from the light source exit surface enters, and a second lens that directs a portion of the light incident from the first entrance surface a conically recessed first surface having a light refraction surface that refracts the light toward the side; and a light reflection surface that is adjacent to the outside of the light refraction surface and reflects a part of the light incident from the first incidence surface to the side. The second lens includes a first incident surface and a first incident surface inside a conical recess surrounded by the first reflective surface. a second incident surface arranged in parallel to which the light emitted from the light refractive surface enters; a second reflective surface recessed in a conical shape that reflects the light incident from the second incident surface laterally; and a second exit surface that emits the reflected light laterally, and the distance between the second entrance surface and the first entrance surface is equal to the distance between the boundary between the light refractive surface and the light reflection surface and the first entrance surface. and smaller than the distance between the outermost periphery of the first reflecting surface and the first incident surface.

According to the lighting device of the present invention, by arranging the entrance surface of the second lens adjacent to the first lens disposed on the light source side inside the first reflective surface of the first lens, the entrance surface of the second lens Since the light incident on the lighting device can be refracted and reflected sideways by hitting the second reflecting surface of the second lens, no glare is felt when the lens of the lighting device is viewed from the front side.

FIG. 1 is a perspective view of a lighting device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 1 is a cross-sectional view showing a laminated structure of a lens according to a first embodiment of the present invention. FIG. 3 is a cross-sectional view showing the arrangement of the second entrance surface according to the first embodiment of the present invention. It is a reference diagram for explaining the path of light. FIG. 3 is a cross-sectional view illustrating a state of light diffusion according to the first embodiment of the present invention. It is a sectional view of the illumination device concerning a 2nd embodiment of the present invention.

Hereinafter, the lighting device of the present invention will be described based on each embodiment with reference to the drawings. Please note that the drawings schematically represent the lighting equipment, the components of the lighting equipment, and the surrounding parts of the lighting equipment, and the actual dimensions and dimensional ratios thereof do not necessarily match the dimensions and dimensional ratios on the drawings. Not yet. Further, unless otherwise specified, for convenience, directions such as up and down are expressed based on the orientation of the lighting device shown in FIG. Duplicate explanations will be omitted as appropriate, and the same members may be given the same reference numerals.

(First embodiment)
FIG. 1 shows a lighting device 10 according to a first embodiment of the invention. The illumination device 10 includes a light source (not shown) and a lens group 2 arranged on the exit surface side of the light source. The light source is arranged at the bottom of the lens group 2, and the lens group 2, which is made up of two lenses, a first lens 3 and a second lens 4, is arranged so as to cover the top of the light source. The lens group 2 has a cylindrical shape as a whole and is made of a transparent material. Most of the light emitted from the light source is emitted laterally from the cylindrical surface on the side surface of the lens group 2.

Next, the structure of the lighting device 10 will be explained in more detail with reference to FIG. Representative light rays are shown in FIG. The optical axis 15, which is the central axis of the lens group 2, passes through the center of the first lens 3, the second lens 4, and the light source 1. Lens group 2 consists of a combination of two individual lenses. The lens group 2 includes a first lens 3 disposed on the light source 1 side, and a second lens 4 disposed on the opposite side of the light source 1 with the first lens 3 interposed therebetween. The first lens 3 and the second lens 4 have a cylindrical shape having substantially the same diameter and having the optical axis 15 as the same axis.

The light source 1 includes a plate-shaped substrate 34 having an upper surface and a lower surface, a light emitting section 35 that emits light on the upper surface of the substrate 34, and a planar surface that emits light on the side opposite to the light source 1 of the light emitting section 35. It has a light source exit surface 33 which is an area of . In this embodiment, the light emitting section 35 is fixed to the upper surface of the substrate 34, but the fixing method and fixing member are not limited as long as the light emitting section 35 can be reliably fixed to the lens group 2.

The first reflective surface 9 on the upper surface side of the first lens 3 has a conical shape with a concave upper part. The second lens lower surface 16 on the bottom side of the second lens 4 has a truncated conical shape that projects downward. Since the second lens lower surface 16 and the first reflective surface 9 have substantially the same cross-sectional shape of the conical slope, they can be combined so as to be close to each other. FIG. 3 shows an example of a method for assembling the first lens 3 and the second lens 4. The first reflective surface 9 of the first lens 3 has a protrusion 25 on its outer periphery. The second lens lower surface 16 of the second lens 4 has a hole 21 on its outer periphery. At least one set of protrusions 25 and holes 21 are formed at corresponding locations on the outer peripheries of the first reflective surface 9 and the second lens lower surface 16. The second lens 4 and the first lens 3 are stacked and combined by fitting the projections 25 and the holes 21 to form the lens group 2.

The number of combinations of protrusions 25 and holes 21 may be two or more. Further, the second lens 4 and the first lens 3 can be joined by interposing an adhesive in the gap between the protrusion 25 and the hole 21. By making the length of the protrusion 25 longer than the depth of the hole 21, a slight gap is created between the first reflective surface 9 and the second lens lower surface 16, and an air layer 17 is formed. has been done. Note that the air layer 17 can also be formed by fine irregularities due to the roughness of the surfaces of the first lens 3 and the second lens 4.

As shown in FIG. 2, the first lens 3 includes a first incident surface 6 formed on the bottom 5 and into which light emitted from the light source exit surface 33 of the light source 1 enters, and a first reflective surface 9 that is conically recessed. and a first output surface 11 that outputs the light reflected by the first reflection surface 9 laterally. The first reflecting surface 9 further includes a light reflecting surface 7 that reflects part of the light incident from the first incident surface 6 to the side depending on the incident angle of the light incident from the first incident surface 6; A light refracting surface 8 is formed that refracts a portion of the light incident from the surface 6 toward the second incident surface 12.

The first entrance surface 6 is a planar surface located above the light source 1 . The first entrance surface 6 is formed perpendicular to the optical axis 15 . The first entrance surface 6 is arranged parallel to the light source exit surface 33 in plan view.

The first reflecting surface 9 is conically depressed, and is a concave curved surface whose cross-sectional shape is symmetrically inclined with the optical axis 15 as the axis of symmetry. There is. Further, the first reflecting surface 9 has a steeper inclination as it approaches the optical axis 15. The tangential direction of the first reflective surface 9 in a cross-sectional view is formed to be closer to the normal direction of the first incident surface 6 as it approaches the center from the outside of the first reflective surface 9 .

The first reflecting surface 9 includes a light reflecting surface 7 that reflects a portion of the light incident from the first incident surface 6 to the side, and a light refracting surface 7 that refracts a portion of the light incident from the first incident surface 6 upward. It has a surface 8. Here, the first reflective surface 9 is irradiated with a plurality of light beams having different incident angles from the first incident surface 6 . As described above, a slight air layer 17 is formed at the interface between the first reflective surface 9 and the second lens lower surface 16. The first reflective surface 9 is a boundary between the first lens 3, which is a medium with a high refractive index, and the air layer 17, which is a medium with a low refractive index. It can also be a refractive surface. In order for the first reflective surface 9 to become a reflective surface, it is necessary that the incident angle of light incident on the first reflective surface 9 be equal to or greater than a critical angle. In order for the first reflective surface 9 to become a refractive surface, the incident angle of the light that enters from the first incident surface 6 and directly enters the first reflective surface 9 without being reflected by the light exit surface 11 must be less than the critical angle. is required.

The light refractive surface 8 is configured such that at least a portion of the light that is emitted from the light source exit surface 33, enters the first entrance surface 6, and is not reflected at the first exit surface is directed to the first reflection surface 9 at an angle less than the critical angle. This is the area on the first reflecting surface 9 that directly hits the area. Light refracted by the light refractive surface 8 is indicated by an arrow L2. The light reflecting surface 7 is adjacent to the outside of the light refractive surface 8, and the light emitted from the light source output surface 33 and incident on the first incident surface 6 is not refracted toward the second lens 4 side, and is provided with a first reflection surface. This is a region on the first reflective surface 9 that hits the surface 9 at an angle equal to or greater than the critical angle. Light reflected by the light reflecting surface 7 is indicated by an arrow L3. Point P indicates the boundary between the light reflecting surface 7 and the light refracting surface 8. In the first reflecting surface 9, on the side farther from the optical axis 15 than the point P, all the light is totally reflected to the side, and between the point P and the optical axis 15, it is refracted and directed to the second incident surface 12 side. There is incident light.

The first output surface 11 is a cylindrical side surface formed so that the outer periphery of the first reflective surface 9 and the outer periphery of the bottom portion 5 are continuous. From the first output surface 11, the light reflected by the first reflection surface 9 is output laterally.

The second lens includes a second entrance surface 12 arranged within the first reflection surface 9 and into which the light emitted from the light refraction surface 8 enters, and a conical shape that reflects the light incident from the second entrance surface 12 laterally. A second reflecting surface 13 having a concave shape and a second emitting surface 14 that emits the light reflected by the second reflecting surface 13 to the side are provided.

Since the second entrance surface 12 protrudes toward the light source 1, it is located below the lower end 32 of the second exit surface 14 on the light source 1 side. Further, the second incident surface 12 disposed inside the conical depression surrounded by the first reflective surface 9 has an outer diameter smaller than the outer diameter of the second output surface 14 , and has a smaller outer diameter than the first output surface 11 . It is formed smaller than the outer diameter. The second incident surface 12, which is disposed inside the conical depression surrounded by the first reflective surface 9 and projects downward toward the light source 1, is formed parallel to the first incident surface 6. In a top view, the second incident surface can take in the light incident from the light refractive surface 8 by including a region where the light emitted from the light refractive surface irradiates the plane including the second incident surface.

The second incident surface 12 is arranged at least closer to the light reflecting surface 7 than a point P, which is the boundary between the light reflecting surface 7 and the light refracting surface 8 of the first reflecting surface 9 . That is, the distance between the second entrance surface 12 and the first entrance surface 6 is greater than the distance between the first entrance surface 6 and the point P that is the boundary between the light refraction surface 8 and the light reflection surface 7. The distance between the outermost periphery of the first reflective surface 9 and the first incident surface 6 is smaller than the distance between the outermost periphery of the first reflective surface 9 and the first incident surface 6 . This is because the second incident surface 12 takes in the refracted light L2 from the light refractive surface 8 without omission. Further, the second incident surface 12 is such that the refracted light L2 incident on the second incident surface 12 from near the boundary between the light reflective surface 7 and the light refracting surface 8 of the first reflective surface 9 is directed to a surface other than the second reflective surface 13. It is arranged at a position where it is directly reflected by the second reflecting surface 13 without being reflected by the second reflecting surface 13.

The second entrance surface 12 will be explained in more detail. As shown in FIG. 4, the position of the point P corresponding to the position on the first reflective surface 9 of the light ray L2 located on the outermost side of the light transmitted through the first reflective surface 9 is the outermost position of the light source 1. It is determined by the side position, that is, the radius r of the light source 1. Here, if the incident angle at the first incident surface 6 of the light ray L2 emitted from the position of radius r, which is the outermost circumferential side of the light source 1, is θ1, the refraction angle is θ2, and the refractive index of the lens is n, then θ1 and θ2 are The following relationship (Equation 1) holds true.
sin θ ₁ = n×sin θ ₂ (Formula 1)
At this time, if the angle between the first reflective surface and the first incident surface at point P is α, the critical angle at point P is θ ₂ +α, and the light ray L2 satisfies (Formula 2).
θ ₂ +α-sin ⁻¹ (1/n)=0...(Formula 2)
The coordinates in FIG. 4 of the point P on the first reflective surface 9 that L2 reaches are (x, y) = (a, b), and the coordinates of the outermost point P' of the second incident surface 12 are (x , y) = (c, d), and the coordinates of the point Q at the outermost periphery of the first reflective surface 9 are (x, y) = (e, f), then the x coordinate of the outermost periphery of the second incident surface c satisfies a≦c<e, and the y coordinate d satisfies b≦d<f. Therefore, the second entrance surface 12 can include a region where the light emitted from the light refraction surface 8 illuminates the plane including the second entrance surface 12.

As described above, the second entrance surface 12 can allow all the light emitted from the light refraction surface 8 to enter therein at a position closer to the light source 1 than the outermost periphery of the first reflection surface 9 . Therefore, the light that is emitted from the light refractive surface 8 and enters the second incident surface 12 is directly reflected by the second reflective surface 13. Specifically, the position on the second entrance surface 12 where the light emitted from the light refraction surface 8 is incident is (d-b)tan (90°-α) away from the optical axis 15 in the orthogonal direction. This distance satisfies (Equation 3) since it is closer to the optical axis 15 than point P'.
a+(d-b)tan(90°-α)≦c...(Formula 3)
Further, the radius of the first lens 3 is R, and the point Q', which is the position of the second reflective surface 13 where the outermost light that has entered from the light refractive surface 8 and entered the second incident surface 12, reaches (x, y) = (g, h), point Q' is a+(d-b)tan(90°-α)+(h-d)tanβ away from the optical axis 15 in the orthogonal direction, and this distance is is closer to the optical axis 15 than the outer diameter of the first lens 3, so it satisfies (Formula 4).
a+(d-b)tan(90°-α)+(h-d)tanβ≦R...(Formula 4)

As shown in FIG. 5, when the second incident surface 12 is not placed sufficiently close to the light source 1, the light reflecting surface 7 and the light refracting surface 8 of the first reflecting surface 9 The light L4 that has entered the second entrance surface 12 from the boundary may be separated from the optical axis 15 due to diffusion, and may strike the second exit surface 14 even if it is refracted by the second entrance surface 12. The light totally reflected by the second output surface 14 exits from the second reflection surface 13, causing glare when the lens is viewed from the front side. In this way, the role of the second entrance surface 12 is to guide the light L2 leaking from the light refraction surface 8 to the second reflection surface 13.

As shown in FIG. 2, the second reflecting surface 13 is conically depressed and has a cross-sectional shape that is symmetrically inclined with respect to the optical axis 15. It is tilted away from the sky. The second reflective surface 13 is not formed from the outer edge of the second lens 4, and the outer peripheral end 23 of the second reflective surface 13 is located inside the outer edge of the second lens 4. That is, in the second lens 4, the second reflective surface 13 and the second exit surface 14 are not formed continuously. The second lens 4 has a flat portion 31 between the second reflective surface 13 and the second exit surface 14 . The plane portion 31 is perpendicular to the optical axis 15 and is formed in a ring shape when viewed from above. A conically recessed second reflecting surface 13 is formed inside the ring-shaped flat section 31 . As described above, although the outer diameter of the second reflecting surface 13 is smaller than the outer diameters of the first reflecting surface 9 and the second exit surface 14, the refracted light from the light refractive surface 8 can be reflected toward the side surface. This is achieved by providing the second incident surface 12 inside the light reflecting surface 7 and further refracting the refracted light from the light refracting surface 8 at a position close to the light source 1, so that the refracted light is shifted closer to the optical axis 15. Because you will be guided. Therefore, the second lens 4 can be accommodated within the outer diameter of the first lens 3.

The height of the deepest portion 19 of the second reflective surface 13 from the second entrance surface 12 is greater than or equal to the height of the lower end 32 of the second exit surface 14 from the second entrance surface 12 . By setting the height of the deepest portion 19 to be equal to or higher than the height of the lower end 32, the light reflected by the second reflective surface can be efficiently emitted from the second output surface. The closer the height of the deepest part 19 is to the height of the lower end 32, the thinner the second lens 4 can be. In this embodiment, the height of the deepest part 19 of the second reflective surface 13 from the second incident surface 12 and the height of the lower end 32 of the second exit surface 14 from the second incident surface 12 are set to be the same. It is set up. Therefore, the second reflective surface 13 is located so as to substantially overlap the second output surface 14 in a side view. Since the second reflective surface 13 and the second output surface 14 are provided so as to overlap in a side view, the light reflected by the second reflective surface 13 can be efficiently output from the second output surface 14. In addition, the second lens 4 can be made thinner. The second exit surface 14 is the same cylindrical side surface as the first exit surface 11 .

As shown in FIG. 2, the first reflective surface 9 of the first lens 3 and the second lens lower surface 16 of the second lens 4 that continues from the second entrance surface 12 to the second exit surface 14 of the second lens 4. An air layer 17 is provided between them, and a light diffusing surface 24 can also be formed on the second lens lower surface 16 of the second lens along this air layer 17. As shown in FIG. 6, there is light that enters the first lens 3 from the first incident surface 6 of the first lens 3 and hits the first exit surface 11 without hitting the first reflective surface 9 of the first lens 3. (arrow L4). This light is totally reflected by the first output surface 11 and exits from the first reflection surface 9, then enters the second lens lower surface 16 and exits from the second reflection surface 13 of the second lens 4. . In this case as well, since the light is emitted in the front direction of the second lens 4, there is a problem in that when the lens group 2 is viewed from the front side, the user feels dazzled. By forming the light diffusing surface 24 on the second lens lower surface 16 of the second lens 4, the light that is totally reflected on the first exit surface 11 is diffused, so that the light emitted in the front direction of the second lens 4 can be greatly reduced. can be reduced. Note that the light diffusing surface 24 needs to be formed at least near the second exit surface 14 . The light that enters the first lens 3 from the first incident surface 6 of the first lens 3 and hits the first exit surface 11 without hitting the first reflective surface 9 of the first lens 3 comes from near the second exit surface 14. This is because the light is incident on the lower surface 16 of the second lens. The light diffusing surface 24 can be formed by providing a continuous finely uneven surface on the second lens lower surface 16.

In this way, by stacking the first reflective surface 9 and the second reflective surface 13 in the optical axis direction, and further providing the second incident surface 12 on the side closer to the light source 1 between the two reflective surfaces, Although it is a small-diameter lens that does not use a reflector, it is able to emit light to the side, suppressing light emitted from the front.

(Second embodiment)
FIG. 7 shows a lighting device 20 according to a second embodiment of the invention. This lighting device 20 differs from the lighting device 10 according to the first embodiment in the points described below, and has the same configuration as the lighting device 10 according to the first embodiment in other points. Therefore, detailed explanation will be omitted by using the same reference numerals for the same configurations.

The first lens 3 is provided with a recess 27 in which the light emitting portion 35 of the light source 1 is accommodated, and the first entrance surface 6 is provided at the bottom of the recess 27. A side entrance surface 29 is formed from the outer periphery of the first entrance surface 6 toward the light source 1 in parallel with the optical axis 15 . By providing the side entrance surface 29 close to the light source exit surface 33 and parallel to the optical axis 15, the path of the light L4 shown in FIG. 6 is refracted at the first exit surface 11 as shown in FIG. The light L5 can be changed to the light L5 that is emitted laterally. Since the light L5 is not totally reflected by the first exit surface 11, the light emitted toward the front of the second lens 4 can be significantly reduced without providing the light diffusing surface 24 on the second lens lower surface 16.

1 Light source 2 Lens group 3 First lens 4 Second lens 5 Bottom part 6 First entrance surface 7 Light reflection surface 8 Light refraction surface 9 First reflection surface 10 Illumination device 11 First exit surface 12 Second entrance surface 13 Second reflection Surface 14 Second exit surface 15 Optical axis 16 Second lens lower surface 17 Air layer 18 Deepest part 19 Deepest part 20 Illumination device 21 Hole 22 Outer edge 23 Outer edge 24 Light diffusing surface 25 Projection 27 Recess 29 Side entrance surface 31 Plane part 32 Lower end 33 Light source exit surface 34 Substrate 35 Light emitting part

Claims (9)

a light source; a lens group disposed on the side of a light source output surface which is a planar area in a light emitting part of the light source; the lens group includes a first lens disposed on the side of the light source; A lighting device comprising: a second lens disposed on the opposite side of the light source through one lens; and an air layer provided between the first lens and the second lens.
The first lens is
a first incident surface parallel to the light source exit surface, which is formed at the bottom of the first lens on the light source side, and into which the light emitted from the light source exit surface enters;
a light refraction surface that refracts a portion of the light incident from the first incidence surface toward the second lens; and a light refraction surface adjacent to the outside of the light refraction surface that refracts a portion of the light incident from the first incidence surface. a conically recessed first reflecting surface having a light reflecting surface that reflects sideways;
a first output surface that outputs the light reflected by the light reflection surface to the side;
The second lens is
a second incident surface arranged parallel to the first incident surface inside a conical recess surrounded by the first reflective surface and into which the light emitted from the light refractive surface is incident;
a conically recessed second reflecting surface that laterally reflects the light incident from the second incident surface;
a second output surface that outputs the light reflected by the second reflection surface to the side,
The distance between the second incident surface and the first incident surface is greater than the distance between the boundary between the light refractive surface and the light reflective surface and the first incident surface, and An illumination device characterized in that the distance is smaller than the distance between the outermost periphery and the first incident surface. The light refractive surface is configured so that at least a portion of the light emitted from the light source exit surface and incident on the first incident surface directly impinges on the first reflective surface at an angle less than a critical angle. and the light reflecting surface is such that the light emitted from the light source exit surface and incident on the first incident surface strikes the first reflecting surface at a critical angle or more without being refracted toward the second lens. The illumination device according to claim 1, wherein the area on the first reflective surface is struck at an angle of . 2. The illumination device according to claim 1, wherein the second entrance surface includes a region where the light emitted from the light refraction surface illuminates a plane including the second entrance surface. The illumination device according to claim 1, wherein the tangential direction of the first reflective surface in a cross-sectional view becomes closer to the normal direction of the first incident surface from the outside to the center of the first reflective surface. The illumination device according to claim 1, wherein the second incident surface is arranged at a position where light emitted from the light refractive surface and incident from the second incident surface is directly reflected by the second reflective surface. The lower surface of the second lens along the air layer between the first reflective surface of the first lens and the lower surface of the second lens, which is a surface between the second incident surface and the second exit surface of the second lens. The illumination device according to claim 1, wherein a light diffusing surface is formed on. The lighting device according to claim 6, wherein the light diffusion surface is formed at least near the second exit surface. The illumination device according to claim 6 or 7, wherein the light diffusing surface comprises a continuous finely uneven surface. The first lens has a recess in which the light emitting part is housed, the first incident surface is formed at the bottom of the recess, and a side surface of the recess is formed to emit light toward the first exit surface. 2. The illumination device according to claim 1, wherein a side entrance surface is formed, and the side entrance surface is radially close to the light source exit surface.

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