CN213237060U

CN213237060U - Lighting device and lamp

Info

Publication number: CN213237060U
Application number: CN202022674969.0U
Authority: CN
Inventors: 杨毅
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-05-18
Anticipated expiration: 2030-11-18

Abstract

The utility model provides a lighting device and a lamp with low chromatic aberration and high heat dispersion efficiency, a reflecting cup, wherein the reflecting cup comprises a light outlet enclosed by a curved surface and a curved surface, and a light transmission area is arranged on the curved surface; the laser light source is positioned on one side of the curved surface, which is far away from the light outlet, and laser emitted by the laser light source penetrates through the light-transmitting area to reach the other side of the curved surface; the laser light which penetrates through the light-transmitting area and reaches the other side of the curved surface excites the fluorescent light-emitting device to emit fluorescent light, the light-emitting direction of the fluorescent light faces the curved surface, and the fluorescent light is emitted from the light outlet after being reflected by the curved surface to form emergent light; compared with the prior art, the laser emitted by the laser source excites the fluorescence light-emitting device to generate fluorescence, and the fluorescence is not refracted by objects such as lenses and is reflected by the reflecting cup and then emitted, so that the chromatic aberration after fluorescence imaging is greatly reduced; and the heat pipe is used for heat dissipation, so that the heat dissipation efficiency is greatly improved, and the damage of the fluorescent material is avoided.

Description

Lighting device and lamp

Technical Field

The utility model relates to the field of lighting technology, specifically speaking relates to a lighting device and lamps and lanterns.

Background

Nowadays, the technology is gradually developed, the light source is updated, and the requirements of people on the light emitted from the light source are more and more strict. Tungsten lamps, xenon lamps and LED lamps, where people are constantly looking for higher brightness light, while laser sources enter the field of vision of people.

The laser light source has the characteristics of high brightness, small wavelength width, small optical expansion and the like, and has wide application scenes in the laser display field and the laser illumination field. The laser emitted by the laser source excites the fluorescent material to emit fluorescence, and the fluorescence also has a series of advantages of the laser, but if the fluorescence is refracted by an object such as a lens in the transmission process, the defects of overlarge chromatic aberration and the like exist after imaging; and laser excitation of the fluorescent material generates a large amount of heat, which may cause damage to the fluorescent material.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the weak point of above-mentioned conventional art, the utility model provides a lighting device and lamps and lanterns that have the colour difference and hang down and heat dispersion is efficient.

In order to solve the above problems, the utility model adopts the following technical scheme: a lighting device comprises a light reflecting cup, wherein the light reflecting cup comprises a curved surface and a light outlet defined by the curved surface, and a light transmitting area is arranged on the curved surface; the laser light source is positioned on one side of the curved surface, which is far away from the light outlet, and laser emitted by the laser light source penetrates through the light-transmitting area to reach the other side of the curved surface; the laser light which penetrates through the light-transmitting area and reaches the other side of the curved surface excites the fluorescent light-emitting device to emit fluorescent light, the light-emitting direction of the fluorescent light faces the curved surface, and the fluorescent light is emitted from the light outlet after being reflected by the curved surface to form emergent light.

As an improvement of the technical scheme: the light-transmitting area is made of transparent materials, a reflecting film for transmitting laser reflection fluorescence is arranged on one surface of the light-transmitting area, and laser from the laser source is converged on the fluorescence light-emitting device after being refracted by the light-transmitting area.

As an improvement of the technical scheme: one surface of the light transmission area, which is plated with the reflecting film, is a spherical surface, part of fluorescence emitted by the fluorescence light-emitting device irradiates the light transmission area, and the light returns to the fluorescence light-emitting device after being reflected by the light transmission area.

As an improvement of the technical scheme: the light-transmitting area is a concave lens.

As an improvement of the technical scheme: the geometric center of the light-transmitting area is positioned in the projection of the fluorescent light-emitting device on the concave surface under the reverse irradiation of the emergent light.

As an improvement of the technical scheme: the curved surface of the reflecting cup is an ellipsoid, and the light emitting point of the excited light of the fluorescent light emitting device is at one focus of the ellipsoid; the curved surface of the reflecting cup is a paraboloid, and the light emitting point of the excited light of the fluorescent light emitting device is at the focus of the paraboloid.

As an improvement of the technical scheme: the fluorescent light-emitting device is fixed on the focus of the reflecting cup by the heat conduction pipe.

As an improvement of the technical scheme: the heat conduction pipe is long-strip-shaped in cross section, and one side of the long-strip-shaped short side faces the reflection cup.

As an improvement of the technical scheme: the device also comprises a shell, wherein a groove is formed in the shell; the heat conduction fixing block is provided with a groove, one side, provided with the groove, of the heat conduction fixing block is fixed with the shell, the groove of the shell is opposite to the groove of the heat conduction fixing block, the heat conduction pipe penetrates through the two grooves, and a heat conduction medium is filled between the heat conduction pipe and the groove.

As an improvement of the technical scheme: a luminaire comprising any one of the lighting devices described herein.

Owing to adopted above-mentioned technical scheme, compare with prior art, the beneficial effect of the utility model: the laser emitted by the laser source excites the fluorescence light-emitting device to generate fluorescence, and the fluorescence is not refracted by an object such as a lens and is reflected by the reflecting cup and then emitted, so that the chromatic aberration after fluorescence imaging is greatly reduced; and the heat pipe is used for heat dissipation, so that the heat dissipation efficiency is greatly improved, and the damage of the fluorescent material is avoided.

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

Drawings

Fig. 1 is a front view of a lighting device.

FIG. 2 is a view showing the structure of a lighting device of embodiment 2

FIG. 3 is a plan view of a lighting device according to embodiment 2

FIG. 4 is a structural view of a heat transfer pipe

FIG. 5 is a top view of the housing

FIG. 6 is a top view of the anchor block

Detailed Description

Example 1:

the structure of the lighting device shown in fig. 1 includes: the light source device comprises a light reflecting cup 101, a curved surface 102, a light outlet 111, a light transmitting area 112, a laser light source 113, a fluorescent light emitting device 114 and a focusing lens 115.

In the field of laser illumination, laser excites fluorescent materials to generate fluorescence, so that an illumination light beam required by heat is obtained, but if the fluorescence passes through a device capable of refracting the light beam such as a lens for multiple times, the light beam generates stray light due to chromatic aberration during imaging. To the above problem, the utility model provides a new thinking: a lighting device comprises a light reflecting cup 101, wherein the light reflecting cup 101 comprises a light outlet 111 enclosed by a curved surface 102 and the curved surface 102, and a light transmitting area 112 is arranged on the curved surface 102; the laser device further comprises a laser light source 113 positioned on one side of the curved surface 102 far away from the light outlet 112, and laser emitted by the laser light source 113 passes through the light-transmitting area 112 to reach the other side of the curved surface 102; the laser light-emitting device 114 passes through the light-transmitting area 112 and reaches the other side of the curved surface 102 to excite the fluorescent light-emitting device 114 to emit fluorescent light, the light-emitting direction of the fluorescent light faces the curved surface 102, and the fluorescent light is reflected by the curved surface 102 and then emitted from the light-emitting port 111 to form emergent light. In order to collect and utilize the light emitted from the fluorescent light emitting device 114, the fluorescent light emitting device 114 can be placed inside the reflective cup 101. In order to enable the collected light to reach the expected emergent effect, the inner wall of the light reflecting cup 101 is generally surrounded by a curved surface 102. In the utility model, the curvature of the curved surface 102 of the reflecting cup 101 can be customized according to the requirement of the customer; the light exiting the reflector cup 101 may be parallel light, divergent light or convergent light, which is determined by the curvature of the reflector cup 101. In this embodiment, in order to obtain the light emitted in parallel from the light reflecting cup 101, it is preferable that the curved surface 102 of the light reflecting cup 101 is a paraboloid, and the light emitting point of the excited light of the fluorescent light emitting device is at the focus of the paraboloid. When the curved surface 102 of the reflector cup 101 is a paraboloid, the curved surface 102 reflects the received light as parallel light and emits the parallel light, wherein in order to enable the light emitted from the fluorescent light-emitting device to be received by the curved surface 102 of the reflector cup 101 to the maximum extent, the light-emitting point of the fluorescent light-emitting device when excited by the excitation light to emit the fluorescent light needs to be arranged on the focal point of the curved surface 102. The light-transmitting area 112 is disposed on the light-reflecting cup 101, and is used in cooperation with the laser light source 113, so that light emitted from the laser light source 113 enters the light-reflecting cup 101 through the light-transmitting area 112, and irradiates the fluorescent light-emitting device 114 to excite the fluorescent light-emitting device 114 to emit fluorescent light, and the fluorescent light is emitted toward the inner wall of the light-reflecting cup 101, and is reflected by the inner wall of the light-reflecting cup 101 and then exits through the light-exiting opening 111. Preferably, the fluorescent light emitting device 114 is disposed at the focal point of the reflective cup 101, so that the reflective cup 101 can collect the fluorescent light emitted by the fluorescent light emitting device 114.

The laser light source 113 may be disposed at other positions, for example, on the light path of the light emitted from the reflector cup 101, or on the side of the light outlet 111 away from the reflector cup 101, as long as the light emitted from the laser light source 113 can excite the fluorescence emitting device 114 to emit fluorescence. However, this arrangement blocks much of the outgoing light from the reflector cup 101, and the spot formed by the outgoing light has a large dark area. Therefore, the present invention preferably provides the laser light source 113 on the side of the curved surface 102 away from the light outlet 111, so that the laser light source 113 can not block the emergent light emitted from the reflective cup 101 while exciting the fluorescence light emitting device 114 to emit fluorescence. In the present invention, the fluorescent light emitting device 114 is a reflective fluorescent light emitting device for further optimizing the light emitting effect.

The present invention is directed to a light-transmitting area 112 used in cooperation with a laser light source 113, wherein the laser light emitted from the laser light source 113 can pass through the light-transmitting area 112 to be utilized, thereby reducing the loss of the laser light in the transmission process, so that the light-transmitting area 112 is made of a transparent material. Further, a reflective film for transmitting laser light and reflecting fluorescence is disposed on one surface of the light-transmitting region 112, and the laser light from the laser light source 113 is refracted by the light-transmitting region 112 and then focused on the fluorescence light-emitting device 114. The utility model discloses the reflectance coating of selecting for use in is the reflectance coating of transmission laser reflection fluorescence. Since the fluorescent light emitting device 114 is inside the reflective cup 101, the fluorescent light emitting device 114 blocks the light emitted from the reflective cup 101, so that the reflective film functions to reuse the fluorescent light emitted from the fluorescent light emitting device 114, reduce light loss, and enhance the brightness of the emitted light; laser emitted from the reflection cup 101 can be reduced, and potential safety hazards are reduced. The laser emitted from the laser source 113 firstly passes through the light-transmitting area 112 on the reflecting cup 101, then is converged on the fluorescent light-emitting device 114 through the refraction of the light-transmitting area 112, and excites the fluorescent light-emitting device 114 to emit fluorescence; when the fluorescence light emitting device 114 converts the laser light into fluorescence, some of the laser light is not converted, and the unconverted laser light is emitted to the inner wall of the reflector 101 together with the fluorescence. And the light-transmitting region 112 is located on the inner wall of the reflector cup 101, so that the light-transmitting region 112 will receive part of the light from the fluorescent light-emitting device 114. Since the reflection film that transmits laser light and reflects fluorescence is disposed on one surface of the light-transmitting region 112, the fluorescence is reflected and reused in the light received by the light-transmitting region 112; the unconverted laser light passes through the light-transmitting region 112 and exits to the laser light source 113. This reduces the laser light component of the light emitted from the reflector cup 101 and increases the fluorescence component. Furthermore, the surface of the transparent area 112 coated with the reflective film is a spherical surface, and a part of the fluorescence emitted by the fluorescent light emitting device 114 irradiates the transparent area 112, and the light is reflected by the transparent area 112 and then returns to the fluorescent light emitting device 114. Since light emitted from the center of the sphere is reflected by the spherical surface centered on the center of the sphere and then returns to the center of the sphere, the surface of the light-transmitting region 112 coated with the reflective film is preferably a spherical surface. The center of the spherical surface is located at the same position as the focus of the reflective cup 101 surrounded by the curved surface 102, and when the fluorescent light emitting device 114 is excited by the laser, the light emitting point on the fluorescent light emitting device 114 is also preferably located at the same position as the center of the spherical surface where the light transmitting area 112 is located. In order to maximize the concentration of the laser light emitted from the laser light source 113 on the fluorescent light emitting device 114, a focusing lens 115 is preferably disposed between the laser light source 113 and the fluorescent light emitting device 114. The focusing lens 115 is a convex lens through which the laser light converges to make the laser light more concentrated when reaching the fluorescent light emitting device 114, thereby reducing the divergence of the laser light.

In summary, the light emitted from the fluorescent light emitting device 114 is divided into two parts, wherein most of the light can be received by the inner wall of the reflective cup 101 and reflected by the reflective cup 101; a small portion of the light is received by the transparent region 112, the fluorescence in the small portion of the light is reflected by the reflective film back to the fluorescent light emitting device 114 for reuse, and the laser in the small portion of the light is emitted through the transparent region 112. This makes the laser part in the emergent light reduced, and the fluorescence part increases, makes the light that emerges from reflector cup 101 safer, and luminance is also higher, and the fluorescence that produces does not pass through the refraction of object such as lens, and directly emerges after being reflected by reflector cup 101, and this colour difference after also greatly reducing the emergent light formation of image.

In order to prevent the transparent region 112 from being redesigned when the curved surface 102 of the reflective cup 101 is changed, and to reduce the time required for re-molding during the shaping process, it is preferable that the transparent region 112 is a concave lens. The concave lens can be customized in a large scale, requires low cost, and is very suitable for the light-transmitting area 112. In order to prevent the laser light from spreading too much before reaching the fluorescence light emitting device 114, a focusing lens 115 is disposed on the laser light path, but the focusing lens 115 may also make the laser light converge in advance and continue to diverge after converging, so the concave lens can also prevent the laser light from converging in advance.

In the present invention, the geometric center of the light-transmitting region 112 is located inside the projection of the fluorescent light emitting device 114 on the concave surface under the backward irradiation of the emergent light. In order to further reduce the light blocked by the fluorescent light emitting device 114 and to enable the light blocked by the fluorescent light emitting device 114 to be reused as much as possible, it is preferable that the light transmitting region 112 is covered to project the fluorescent light emitting device 114 on a concave surface in a direction opposite to the direction of light emitted from the reflector cup 101. That is to say, the range of the light-transmitting region 112 is equal to or slightly larger than the range of the fluorescent light-emitting device 114 projected on the concave surface under the reverse irradiation of the light emitted from the reflective cup 101, so that the emitted light blocked by the fluorescent light-emitting device 114 can be reused, and the light-transmitting region 112 does not additionally reflect other directly emitted light while reflecting the light blocked by the fluorescent light-emitting device 114, so that the emitted light in the whole lighting device can be reasonably utilized.

Example 2:

as shown in the structure diagram of the lighting device shown in fig. 2 and the top view of the lighting device shown in fig. 3, the present embodiment includes: the device comprises a reflecting cup 201, a curved surface 202, a heat pipe 203, a fixed platform 204, a heat conducting fixed block 205, a shell 206, a light transmitting area 212, a laser light source 213, a fluorescent light-emitting device 214, a first focus 216a and a second focus 216b

The curved surface 202 of the reflector 201 is an ellipsoid, and the light emitting point of the fluorescence light emitting device 214 excited by the excitation light is at a focal point of the ellipsoid. Geometrically, an ellipsoid has two focal points, and light emitted from one of the focal points is reflected by the inner surface of the ellipsoid, and then the light converges on the other focal point. In this embodiment, there are two embodiments, the first is that when the fluorescent light-emitting device 214 is placed at the first focal point 216a, the light emitted from the fluorescent light-emitting device 214 is converged at the second focal point 216b after being reflected by the inner wall of the light-reflecting cup 201, and then emitted in a divergent manner. Secondly, when the fluorescent light-emitting device 214 is placed at the second focal point 216b, the light emitted from the fluorescent light-emitting device 214 is converged at the first focal point 216a after being reflected by the inner wall of the light-reflecting cup 201, and then is emitted in a divergent manner. In the first embodiment, the light reflected and emitted by the reflective cup 201 will pass through the fluorescent light-emitting device 214 and be converged at the second focal point 216 b; in the second embodiment, the light reflected by the reflector 201 is converged at the first focal point 216a, and then the divergent light exits. Although the outgoing light in both embodiments is partially blocked by the fluorescent light emitting device 214, in the first embodiment, the outgoing light is converged after passing through the fluorescent light emitting device 214, which makes the dark area of the outgoing light forming a spot after being emitted smaller, and meets our needs, so the first embodiment is preferred in this embodiment.

In the first embodiment, the light-transmitting area 212 on the reflective cup 201 is also preferably a spherical surface, and the center of the spherical surface where the light-transmitting area 212 is located needs to coincide with the focus where the fluorescent light-emitting device 214 is located, which ensures that the light emitted from the fluorescent light-emitting device 214 can be sufficiently received by the reflective cup 201 and reflected out, and at the same time ensures that the light shielded by the fluorescent light-emitting device 214 can be reused, thereby avoiding waste of light energy.

In this embodiment, in order to ensure the heat dissipation of the fluorescent light emitting device 214, a preferred embodiment further includes a heat conducting pipe 203, and the heat conducting pipe 203 fixes the fluorescent light emitting device 214 at the focal point of the light reflecting cup 201. The heat conductive pipe 203 is preferably a heat pipe, which utilizes the phase change process of the medium after evaporating at the hot end and condensing at the cold end (i.e. utilizing the latent heat of evaporation and condensation of the liquid) to rapidly conduct heat. The heat pipe 203 also has a fixing function, so that the fluorescent light emitting device 214 can be fixed on the focus of the light reflecting cup 201, and when the light reflecting cup 201 can better receive the light from the fluorescent light emitting device 214, the need of additionally installing a support frame is eliminated, and the shielding area of the fluorescent light emitting device 214 for emergent light is also reduced. In order to further reduce the shielding of the outgoing light, as shown in fig. 4, it is preferable that the heat pipe 203 has a long cross section and a short side of the long cross section faces the reflector 201. The cross section of the heat conductive pipe 203 is elongated, and the elongated shape has a short side 203b and a long side 203a opposed to each other in two dimensions. The side of the short side 203b opposite to the side of the long side 203a is narrower than the side of the short side opposite to the side of the short side, and therefore, the light is less blocked, so that the long short side is disposed toward the reflector cup 201.

In this patent, in order to protect the reflector cup 201 from being damaged, a housing 206 is further included on the periphery of the reflector cup 201, and a top view of the housing 206 is shown in fig. 5. In order to avoid further increase in the volume of the whole device, the heat pipe 203 is closely attached to the housing 206 and extends toward the light-transmitting region 212 of the reflector 201. Further, the housing 206 is provided with a groove, and the heat conducting pipe 203 is embedded into the groove, which not only increases the heat dissipation area of the heat conducting pipe 203, but also fully uses the space, and reduces the volume of the whole device. Still further, the heat conduction module further comprises a heat conduction fixed block 205, a groove is arranged on the heat conduction fixed block 205, one side of the heat conduction fixed block 205, which is provided with the groove, is fixed with the shell 206, the groove of the shell 206 is arranged opposite to the groove of the heat conduction fixed block 205, the heat conduction pipe 203 penetrates through the two grooves, and a heat conduction medium is filled between the heat conduction pipe 203 and the grooves. A top view of the heat-conducting fixing block 205 is shown in fig. 6. Because of the factors such as error existing during the manufacturing process of the heat pipe, it is difficult to make a tight seam when the heat pipe is embedded into the groove on the housing 206, which results in that a worker needs to press the heat pipe 203 when embedding the heat pipe 203 into the groove for fixing, and then fills the heat conducting glue to fix the heat pipe 203. This not only increases the production time of the device, but also causes the problem that the heat conduction pipe 203 is warped due to the incomplete fixation of the whole device, so we introduce the heat conduction fixing block 205 to fix the heat conduction pipe 203. The heat-conducting fixing block 205 is provided with a groove, and the side of the heat-conducting fixing block 205 provided with the groove is arranged towards the reflection cup 201, the groove corresponds to the groove on the device shell 206, and the heat-conducting pipe 203 passes through the two grooves. Because the heat conduction fixed block 205 is fixed on the device shell 206, the groove of the heat conduction fixed block 205 and the corresponding groove on the shell 206 form a channel, so that a worker can position the heat conduction pipe 203 by only penetrating the groove through the channel when embedding the heat conduction pipe 203 into the groove, the problem that the worker needs to press the heat conduction pipe 203 is avoided, and the problem that the heat conduction pipe 203 is warped due to improper fixation is also avoided. Moreover, the heat conducting pipes 203 are embedded in the heat conducting fixing block 205, so that the contact area between the heat conducting pipes 203 and the heat conducting fixing block 205 is increased, that is, the heat dissipation area of the heat conducting pipes 203 is increased, and the heat dissipation rate is increased.

Since the narrow side of the heat pipe 203 is disposed toward the reflective cup 201, which also causes inconvenience in fixing the fluorescent light emitting device 214 to the heat pipe 203, a fixing stand 204 may be further provided for convenience of fixing. The fluorescent light emitting device 214 is fixed to the fixing base 204, and then the fixing base 204 is fixed to the heat pipe 203. The heat generated by the fluorescent light emitting device 214 is conducted to the heat conduction pipe 203 through the fixing base 204, and finally, the heat is conducted to the outside by the heat conduction pipe 203. In the present embodiment, since the light is first converged and then diverged, the shape of the fixed stage 204 may be a circular truncated cone, a circular cone, a truncated pyramid, or a pyramid in order to reduce the light blocked by the fixed stage 204.

The heat-dissipating fixing devices such as the heat pipe 203 and the fixing base 204 described in this embodiment are also applicable to the other embodiments in this patent.

The present invention is not limited to the embodiments described above, but the embodiments are only preferred embodiments of the present invention and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should fall within the patent coverage of the present invention.

Claims

1. An illumination device, characterized by: the light-emitting cup comprises a light-reflecting cup, wherein the light-reflecting cup comprises a curved surface and a light-emitting opening defined by the curved surface, and a light-transmitting area is arranged on the curved surface; the laser light source is positioned on one side of the curved surface, which is far away from the light outlet, and laser emitted by the laser light source penetrates through the light-transmitting area to reach the other side of the curved surface; the laser light which penetrates through the light-transmitting area and reaches the other side of the curved surface excites the fluorescent light-emitting device to emit fluorescent light, the light-emitting direction of the fluorescent light faces the curved surface, and the fluorescent light is emitted from the light outlet after being reflected by the curved surface to form emergent light.

2. A lighting device as recited in claim 1, wherein: the light-transmitting area is made of transparent materials, a reflecting film for transmitting laser reflection fluorescence is arranged on one surface of the light-transmitting area, and laser from the laser source is converged on the fluorescence light-emitting device after being refracted by the light-transmitting area.

3. A lighting device as recited in claim 2, wherein: one surface of the light transmission area, which is plated with the reflecting film, is a spherical surface, part of fluorescence emitted by the fluorescence light-emitting device irradiates the light transmission area, and the light returns to the fluorescence light-emitting device after being reflected by the light transmission area.

4. A lighting device as recited in claim 3, wherein: the light-transmitting area is a concave lens.

5. A lighting device as recited in any one of claims 1-4, wherein: the geometric center of the light-transmitting area is positioned in the projection of the fluorescent light-emitting device on the concave surface under the reverse irradiation of the emergent light.

6. A lighting device as recited in claim 1, wherein: the curved surface of the reflecting cup is an ellipsoid, and the light emitting point of the excited light of the fluorescent light emitting device is at one focus of the ellipsoid; the curved surface of the reflecting cup is a paraboloid, and the light emitting point of the excited light of the fluorescent light emitting device is at the focus of the paraboloid.

7. A lighting device as recited in claim 1, wherein: the fluorescent light-emitting device is fixed on the focus of the reflecting cup by the heat conduction pipe.

8. A lighting device as recited in claim 7, wherein: the heat conduction pipe is long-strip-shaped in cross section, and one side of the long-strip-shaped short side faces the reflection cup.

9. A lighting device as recited in claim 7, wherein: the device also comprises a shell, wherein a groove is formed in the shell; the heat conduction fixing block is provided with a groove, one side, provided with the groove, of the heat conduction fixing block is fixed with the shell, the groove of the shell is opposite to the groove of the heat conduction fixing block, the heat conduction pipe penetrates through the two grooves, and a heat conduction medium is filled between the heat conduction pipe and the groove.

10. A light fixture, characterized by: a lighting device comprising any one of claims 1-9.