CN114647140A - A lighting device and lamps and a projection display device - Google Patents

Abstract

The invention discloses a lighting device, a lamp and a projection display device with high-efficiency heat dissipation, which comprise a light source, a light-transmitting support substrate and a fluorescent material arranged on one side of the light-transmitting support substrate, wherein the light-transmitting support substrate comprises a ring area and a transparent area, the fluorescent material is arranged at least partially in the ring area, the ring area is arranged around the transparent area, and a reflecting surface for reflecting fluorescence is arranged between the light-transmitting support substrate and the fluorescent material; the light emitted by the light source irradiates the annular area to form a light spot and excites the fluorescent material, so that the fluorescent material emits fluorescence; the light-transmitting support substrate is characterized by further comprising a motor for driving the light-transmitting support substrate to rotate, and a rotating shaft penetrates through the circle center of the circular ring area when the light-transmitting support substrate rotates. The motor drives the light-transmitting support substrate to rotate to form air flow, the air flow accelerates the heat dissipation speed of the whole lighting device, and the damage of fluorescent materials caused by heat accumulation is avoided.

Description

A lighting device and lamps and a projection display device

technical field

The present invention relates to the technical field of lighting, and in particular, to a lighting device and a lamp.

Background technique

The use of LED light-emitting chips to excite fluorescent materials to emit light for lighting, decoration and projection has gradually replaced traditional lamps, such as tungsten lamps, xenon lamps, etc., and LED light sources have the advantages of high brightness and long life.

Compared with LED chips, the light emitted by laser-excited fluorescent materials has the advantages of higher brightness, longer life, better directivity and lower energy consumption. It is a recognized solution for the next generation of high brightness light sources in the lighting field. Program.

However, whether it is an LED light source or a laser light source, there is a heat dissipation problem. Since the fluorescent material will release heat in the process of converting the absorbed light to fluoresce, and the LED chip and the laser diode itself will also emit a lot of heat in the process of emitting light. Therefore, if the temperature is too high, the fluorescent material will be burnt, and the life of the light source will be shortened. Therefore, how to solve the problem of heat dissipation of the light source has always been a problem in the lighting field.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the above-mentioned conventional technologies, and the present invention provides a lighting device, a lamp and a projection display device that can efficiently dissipate heat.

In order to solve the above problems, the technical solution adopted in the present invention is: an illuminating device, comprising a light source that emits light, a light-transmitting support substrate, and a fluorescent material disposed on one side of the light-transmitting support substrate, the light-transmitting supporting substrate comprising a circular an annular area and a transparent area, the annular area is at least partially provided with a fluorescent material, the annular area is arranged around the transparent area, and a reflective surface for reflecting fluorescence is arranged between the light-transmitting support substrate and the fluorescent material; a light source that emits light The emitted light irradiates the annular area to form a light spot, and excites the fluorescent material, so that the fluorescent material emits fluorescence; it also includes a motor that drives the light-transmitting support substrate to rotate, and the rotation axis of the light-transmitting support substrate when it rotates passes through the circle. The center of the circle.

As an improvement of the above technical solution: it also includes a reflective cup, the reflective cup includes a reflection area and a light outlet, the light transmission area at least partially covers the light outlet, and the fluorescent light is emitted toward the reflective surface and reflected by the reflective surface. The light outlet exits.

As an improvement of the above technical solution, the transparent support substrate uses a transparent thermal conductive material, or the transparent area is hollowed out.

As an improvement of the above technical solution, the motor is located at the edge of the light outlet.

As an improvement of the above technical solution: the reflector further includes a through hole, the light emitted by the light source passes through the through hole to excite the fluorescent material, a concave lens is arranged in the through hole, and the concave surface of the concave lens faces the fluorescent material In the configuration, the concave surface is coated with a reflective film that transmits laser light and reflects fluorescence.

As an improvement of the above technical solution, the reflection area is a part of an ellipsoid or a paraboloid, and the light spot formed on the fluorescent material by the light emitted by the light source coincides with the focal point of the reflector.

As an improvement of the above technical solution: it also includes a series of first fins, the series of first fins are connected to the side of the light-transmitting support substrate away from the fluorescent material, and the series of first fins at least partially cover The annular area is used to generate an air flow that flows outward in a radial direction when the light-transmitting support substrate rotates.

As an improvement of the above technical solution: it also includes a casing, the casing includes a series of second fins, and at least part of the adjacent second fins form air ducts, the air ducts are used to guide the radial direction from the annular region to the At least part of the outgoing airflow returns to the end of the first fin near the center of the annular region to form an airflow loop.

As an improvement of the above technical solution: a lamp includes the lighting device described in any one of the above.

As an improvement of the above technical solution: a projection display device includes the lighting device described in any one of the above.

Due to the adoption of the above technical solution, compared with the prior art, in the present invention, the fluorescent material is arranged in the annular area on the light-transmitting heat-conducting substrate, the light emitted by the light source excites the fluorescent material, and the fluorescent material emits a large amount of light while emitting fluorescence. The heat is carried away by the air flow formed by the rotation of the light-transmitting and heat-conducting substrate driven by the motor. In summary, we use the motor to drive the light-transmitting support substrate to rotate to form an air flow, and the air flow accelerates the heat dissipation rate of the entire lighting device and avoids the damage to the fluorescent material caused by heat accumulation.

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

Description of drawings

FIG. 1 is a configuration diagram of a lighting device.

FIG. 2 is a plan view of the lighting device.

FIG. 3 is a top view of another light-transmitting support substrate.

FIG. 4 is a top view of another light-transmitting support substrate.

FIG. 5 is a structural diagram of a preferred lighting device.

FIG. 6 is a configuration diagram of a lighting device.

7 is a plan view of a light-transmitting support substrate.

FIG. 8 is a structural diagram of the first fin.

FIG. 9 is a plan view of the lighting device.

Detailed ways

Example 1:

In this embodiment, the components are labeled as follows: light source 111, light-transmitting support substrate 101, fluorescent material 112, annular area 101a, transparent area 101b, reflective surface 113, motor 102, light emitted by the light source 121, fluorescent light 122, reflective Cup 103, reflective area 103a, light outlet 103b, through hole 104, concave lens 114, reflective film 114a.

In the current lighting field, people have come up with various solutions to solve the heat dissipation problem of light sources. However, when facing the heat dissipation problem of small-volume light sources, it is still one of the pain points of the industry. Faced with these problems, we propose a new solution to heat dissipation. As shown in FIG. 1 , a structural diagram of a lighting device, a lighting device includes a light source 111 that emits light, a light-transmitting support substrate 101 and a fluorescent material 112 disposed on one side of the light-transmitting support substrate 101 . The light-transmitting support substrate 101 includes The annular region 101a and the transparent region 101b, the annular region 101a is at least partially provided with a fluorescent material 112, the annular region 101a is arranged around the transparent region 101b, and a light-transmitting support substrate 101 and the fluorescent material 112 are arranged between The reflective surface 113 that reflects the fluorescence; the light 121 emitted by the light-emitting light source 111 irradiates the annular area 101a to form a light spot, and excites the fluorescent material 112, so that the fluorescent material 112 emits fluorescence 122; it also includes driving the transparent supporting substrate 101 to rotate The motor 102 of the light-transmitting support substrate 101 rotates through the center of the annular area 101a. As shown in the top view of the lighting device in FIG. 2 , in this embodiment, the light-transmitting support substrate 101 is selected as the carrier, and the fluorescent material 112 is arranged on one side of the light-transmitting support substrate 101 . The light-transmitting support substrate 101 is divided into two regions, a ring region 101a and a light-transmitting region 101b, and the ring region 101a is arranged around the light-transmitting region 101b. The annular region 101a is used as the main bearing region of the fluorescent material 112, so the annular region 101a is provided with the fluorescent material 112 at least in part. Of course, when this solution is used in the field of illumination, the area of the annular region 101a is preferably covered with the fluorescent material 112, so that when the light beam excites the fluorescent material 112 and causes the fluorescent material 112 to emit fluorescence, the generated fluorescence will not appear. Uneven distribution; however, this solution can also be applied in the field of projection display. As shown in the top view of the light-transmitting support substrate shown in FIG. 3 , in order to make the display color more abundant, the circle area can be divided into a red area R, a green area G, a blue area B and a white area W. If the light-emitting source is a laser light source that emits blue laser light, then the red area is provided with a fluorescent material that is excited to emit red light, the green area is provided with a fluorescent material that is excited to emit green light, and the white area is provided with yellow fluorescent material (yellow fluorescent material). Excited, yellow light is emitted, and the yellow light is mixed with the blue laser to become white light), and the blue area is provided with a scattering sheet, so that the entire device will emit different colors of sequential light when the light-transmitting support substrate rotates. These different colors After the timing light is adjusted, it can be used for projection display. In the device structure shown in FIG. 1 , in order to match the optical path design of the device in this solution, a reflective surface 113 needs to be provided between the fluorescent material 112 and the light-transmitting support substrate 101 , so that the fluorescence generated by the excitation of the fluorescent material 112 will be reflected and emitted . The light 121 emitted by the light source 111 irradiates the annular area 101a and forms a light spot on the annular area 101a. The light 121 excites the fluorescent material 121 on the annular area 101a to emit fluorescence 122. However, when the fluorescent material 112 is excited to emit the fluorescent light 122, a large amount of heat will be generated. If the heat is not quickly dissipated, heat accumulation will occur and the fluorescent material 112 will be thermally quenched, which will reduce the service life of the lighting device. It can also cause safety hazards. Therefore, in this solution, the motor 102 is used to drive the light-transmitting support substrate 101 to rotate, and the speed of heat dissipation is increased by accelerating the flow of air. In this solution, in order to avoid wasting light energy, the fluorescent material 112 needs to preferentially cover the light spot, so that the light 121 can fully excite the fluorescent material 112, which avoids wasting light energy and also avoids the fluorescent light 122 excited by the fluorescent material 112. uneven distribution. Preferably, the annular region 101a also needs to be covered with the fluorescent material 112 to prevent the possibility of the fluorescent material from also existing in the transparent region 101b, and to prevent the fluorescent material from affecting the emission of fluorescence through the transparent region 101b. More preferably, the annular region 101a, the fluorescent material 112 and the light spot overlap. In order to enable the transparent support substrate 101 to rotate smoothly, the rotation axis of the transparent support substrate 101 needs to pass through the center of the annular area 101a when it rotates.

Since the laser has the advantages of high brightness and high directivity, and the fluorescence obtained by exciting the fluorescent material by the laser also inherits various advantages of the laser, in this solution, we prefer to use a laser diode as the light source 111 . The fluorescent material 112 emits Lambertian light when it is excited. It can be understood that the fluorescence emitted by the fluorescent material 112 will be randomly emitted around, but if these randomly emitted lights cannot be collected, we cannot get the outgoing light we want. of. Therefore, a preferred embodiment further includes a reflective cup 103, the reflective cup 103 includes a reflective area 103a and a light outlet 103b, the light transmission area 101b at least partially covers the light outlet 103b, and the fluorescent light 122 faces the reflective area 103a The light is emitted and reflected by the reflection area 103a and then exits through the light outlet 103b. The reflective cup 103 is used to collect the fluorescent light 122 randomly emitted around, and then the optical path of the collected fluorescent light 122 is changed through the reflection area 103a of the reflective cup 103, so that the optical path of the fluorescent light 122 changes to the direction expected by the design, and then passes through the reflection area 103a of the reflective cup 103. The light is emitted through the light outlet 103b of the reflector 103 . Wherein, in order to prevent the annular region 101a from blocking too much outgoing fluorescent light 122, the light-transmitting region 101b of the light-transmitting supporting substrate 101 needs to at least partially cover the light-exiting port 103b. This design enables the reflector to receive more fluorescent light 122 and at the same time allow part of the fluorescent light 122 to exit through the light-transmitting region 101b.

In order to prevent the light-transmitting support substrate 101 from blocking the fluorescence, preferably, the light-transmitting support substrate 101 uses a transparent thermally conductive material. Since the light-transmitting support substrate 101 covers the light outlet 103b, in order to allow the emitted fluorescence to pass through as much as possible, the light-transmitting support substrate 101 needs to use a transparent material, and in order to assist the fluorescent material 112 to dissipate heat, the light-transmitting support substrate needs to use a thermally conductive material. Considering factors, the light-transmitting support substrate 101 can be processed by using materials such as sapphire sheet, diamond sheet and the like. However, considering the problem of heat dissipation alone, there is another preferred method that the light-transmitting support substrate 101 is a metal substrate. The metal substrate has better heat dissipation capability, but the metal substrate has the great defect of opacity. Therefore, in order to reduce the shielding of light by the metal substrate, as shown in FIG. 4 , the top view of the light-transmitting support substrate is preferably, the light-transmitting area 101 b of the light-transmitting support substrate 101 is hollowed out. By hollowing out the transparent area 101b, the fluorescent light 122 can be emitted through the light-transmitting supporting substrate 101 as much as possible. Although part of the fluorescent light is still blocked, as the rotation speed of the light-transmitting supporting substrate 101 is accelerated to a certain speed, the human eye will not be affected. It is impossible to recognize the presence of dark areas, so it is acceptable that part of the fluorescence is occluded.

In order to further emit more fluorescent light 122, the light source 111 needs to avoid being disposed on the light path of the fluorescent light 122. Therefore, in a preferred embodiment, the reflector 103 further includes a through hole 104, and the light source 111 emits light. The light 121 excites the fluorescent material 112 after passing through the through hole 104 . A through hole 104 is machined on the reflector 103 by a milling machine, the light source 111 emits light 121 outside the reflector 103, and then the light 121 passes through the through hole 104 to excite the fluorescent material 112, so that the fluorescent material 112 emits fluorescence. This design avoids The light source 111 blocks the fluorescent light and avoids wasting light energy. In order to prevent the light from the light source 111 from forming an excessively large spot on the fluorescent material 112, resulting in the reduction of the central light intensity of the excited fluorescent light, the optical axis of the light 121 from the light source 111 needs to be perpendicular to the fluorescent material 112, so the through hole 104 needs to be provided The projection of the fluorescent material on the reflector 103 . However, the existence of the through hole 104 will cause light leakage from the reflector 103. In order to avoid light leakage from the reflector 103, the front view of the structure is shown in FIG. 5. Preferably, the through hole 104 is provided with a concave lens 114. The concave surface of 114 is disposed toward the fluorescent material 112, and the concave surface is coated with a reflective film 114a that transmits laser light and reflects fluorescent light. By arranging a concave lens in the through hole 104 with a reflective film 114a that transmits laser light and reflects fluorescence, the fluorescence that may pass through the through hole 104 is reflected and emitted, which not only avoids light leakage but also increases the utilization rate of the fluorescence. The purpose of arranging a concave lens in the through hole 104 is to prevent the light emitted by the light source 111 from concentrating on a point of the fluorescent material 112, because the ability of the fluorescent material 112 to convert light per unit area is limited. If the light is too concentrated, it is unavoidable It will cause part of the light not to be converted and utilized. The concave lens has the function of diffusing light, so the concave lens is used to diffuse the light in a certain range to increase the conversion of the light by the fluorescent material 112 . In addition, the concave lens 114 is coated with a reflective film 114a that can transmit laser reflected fluorescence, so that the fluorescence originally intended to be emitted through the through hole 104 will be reflected toward the light outlet 103b of the reflector 103, and the fluorescence that may be wasted can be reused. . Furthermore, the concave surface of the concave lens 114 is a spherical surface, and the light-emitting point of the fluorescent material 112 coincides with the spherical center of the spherical surface. According to geometric principles, the light emitted from the center of the sphere will continue to return to the center of the sphere after being reflected by the inner wall of the sphere where the center of the sphere is located. Therefore, the fluorescent light reflected by the concave surface of the concave lens 114 will return to the fluorescent material 112 . The fluorescent material 112 itself is granular and has the function of scattering, and coupled with the reflection of the reflective surface 113, the fluorescent light returned from the concave surface of the concave lens 114 will be reflected and emitted again.

Still further, the motor 102 is located at the edge of the light outlet 103b. The purpose of this design is to prevent the motor 102 from blocking the fluorescent light 122 emitted from the light outlet 103b, and also to minimize the volume of the entire device. In order to conveniently adjust the distance between the light-transmitting support substrate 101 and the reflector 103 , in this solution, the motor 102 is disposed on the side of the light-transmitting support substrate 101 away from the fluorescent material 112 . In order to further reduce the volume of the entire device, the motor 102 can also be disposed on the same side of the thermally conductive support substrate 101 and the fluorescent material 112, so that the space required for the entire device will be further reduced.

In order to make the fluorescent light 122 exit from the light outlet to the greatest extent, there is also a preferred embodiment that the reflection area 103a is a part of an ellipsoid surface. According to the geometric principle, the ellipsoid has two focal points, and the light emitted from one focal point is reflected by the inner wall of the ellipsoid and then converges to the other focal point, and then radiates out. Using this principle, the light-emitting point of the fluorescent material 112 is set at the same position as a focal point of the ellipsoid surface, so that the fluorescent light 122 emitted from the fluorescent material 112 will also converge. The fluorescence of 122 will bypass the two and then converge, so as to ensure the emission rate of fluorescence 122 to the greatest extent.

In the process of emitting the fluorescent light 122, the size of the reflective surface 113 on the light-transmitting support substrate 101 also needs to be considered. In order to ensure that all the fluorescent light emitted by the fluorescent material 112 can be emitted toward the reflector 103, the reflective surface 113 needs to cover the fluorescent material 112; However, if the area covered by the reflective surface 113 is too large, it will affect the fluorescent light 122 passing through the light-transmitting supporting substrate 101 . Therefore, the reflective surface 113 needs to be the same size as the fluorescent material 112, or the reflective surface 113 also needs to be a ring, and the size of the reflective surface 113 is the same as that of the ring area 101a and the center of the circle coincides. Therefore, the reflective surface 113 may be a metal ring made of a metal substrate, or may be a reflective coating or a reflective coating disposed on the annular region 101a to reflect fluorescence.

In summary, in order to solve the problem of heat dissipation of the fluorescent material 112, in this embodiment, the fluorescent material is arranged on the light-transmitting support substrate 101, and then the motor 102 is used to drive the light-transmitting support substrate 101 to rotate to generate air flow, and the air flow is used to displace the fluorescent material. The heat generated when the material 112 is excited to generate fluorescence is quickly taken away; in order to match the emission of the fluorescence 122, a reflector 103 is provided to collect the fluorescence 122 and change the light path to emit light to obtain the output light that meets the needs of use.

Example 2:

In this embodiment, the components are labeled as follows: first fin 205, shell 206, second fin 207, light-transmitting support substrate 201, annular area 201a, fluorescent material 212, light source 211, reflection area 203a, fluorescent material 212, reflector 203.

As shown in FIG. 6 , one of the differences between this embodiment and Embodiment 1 is that the reflection area 203a is a part of a paraboloid. The paraboloid can collimate the collected light and then exit it, making the exit light distribution more uniform. Regardless of whether the reflection area is an ellipsoid or a paraboloid, in order to achieve the best effect of the emitted fluorescence, preferably, the light spot formed by the light 221 emitted by the light source 211 on the fluorescent material 212 coincides with the focus of the reflector 203 . Only when the light spot formed by the light 121 from the light source 211 on the fluorescent material 122 coincides with the focal point of the reflector 203 , that is, the excitation of the fluorescent material 212 coincides with the focus of the reflector 203 , can the fluorescence emitted from the fluorescent material 212 be guaranteed to be absorbed by the reflector 203 . Reflector 203 for better reception.

In order to further increase the heat dissipation speed of the fluorescent material, we can also make improvements on the basis of Example 1. When the light emitted by some high-power light sources makes the fluorescent material excited, it is far from enough to only use the motor to drive the air flow generated by the rotation of the light-transmitting support substrate. Therefore, a series of first fins 205 are also included, the series of first fins 205 are connected to the side of the light-transmitting support substrate 201 away from the fluorescent material 212 , and the series of first fins 205 at least partially cover the annular area 201a, for generating the airflow 231 flowing out in the radial direction when the light-transmitting supporting substrate 201 rotates. As shown in the top view of the light-transmitting support substrate 201 as shown in FIG. 7 , a series of first fins 205 are disposed on the side of the light-transmitting support substrate 201 away from the fluorescent material 212 , so that the heat generated when the fluorescent material 212 converts light can be minimized in the shortest The distance and time are transferred to the first fins 205, which at least partially need to be connected to the annular region 201a. This design makes the overall heat dissipation area larger and drives more air flow, thereby increasing the heat dissipation efficiency of the fluorescent material 212 . In order to further increase the flow speed of the air, a preferred embodiment is that the direction of the first fins 205 is along the radial direction of the annular area 201a, and the purpose of this design is to ensure that the light-transmitting support substrate 201 rotates along the circular direction. The outgoing airflow 231 in the radial direction of the annular region 201a. The air between the adjacent first fins 205 will flow out to the periphery of the light-transmitting supporting substrate 201 along the direction of the first fins 205 due to centrifugal force, and at the same time, due to the negative pressure, the first fins 205 will be close to the annular area. The air at one end of the center of the circle 201 a flows between the first fins 205 . This part of the air flowing between the first fins 205 takes away heat, and the air entering from the center of the annular region 201a will be heated by the first fins 205, thereby realizing rapid heat dissipation. In this embodiment, the first fins 205 are centripetal, but may not be completely centripetal in actual product use. As shown in FIG. 8 , for example, the first fins 205 are curved. It is worth noting that the direction of the first fin 205 is along the radial direction of the annular area 201a, which means that the distance from one end of the first fin 205 to the center of the annular area 201a is smaller than the distance from the other end to the annular area The distance from the center of the area 201a can be achieved in this way to achieve the purpose of generating an air flow that flows outward in the radial direction when the light-transmitting supporting substrate 201 rotates. Here, the air flow out in the radial direction is not limited to the outflow in the centrifugal direction, as long as it flows out from the periphery of the annular region 201a, the purpose can be achieved.

Further, as shown in the top view of the lighting device in FIG. 9 , it further includes a casing 206, the casing 206 includes a series of second fins 207, and at least some of the adjacent second fins 207 form air ducts. For guiding the air flow radially outward from the annular region 201a to return at least part of the first fin 205 to the end of the first fin 205 near the center of the annular region to form an air flow loop. The housing 206 encloses the light-transmitting support substrate 201 in its interior, the housing 206 includes a series of second fins 207, and at least some of the adjacent second fins 207 form air ducts for guiding the light-transmitting support substrate 201 At least part of the airflow 232 in the airflow flowing out in the radial direction of the annular region 201a returns to the end of the first fin 205 close to the center of the annular region 201a to form an airflow loop, which flows into the first fin 205 again. between. It can be seen that after the heated airflow enters the air duct formed by the second fins 207, it will first be guided by the air duct to flow upward, and then be bent toward the center of the circle, and finally the second fins arranged along the radial direction will flow upward. The air channel formed by the fins 207 flows in the direction of the center of the circle, and finally forms an air flow loop and flows into the first fins 205 again. During this process, the airflow 231 flowing out of the first fins 205 will transfer the heat carried by it to the second fins 207 and the casing 206 , and the temperature of the airflow will drop, so as to flow into the first fins 205 again. Time will continue to take away heat, forming a cycle.

To sum up, in this embodiment, in order to obtain collimated parallel light, the shape of the reflection area 203a of the reflector 203 is preferably a paraboloid; and in order to further speed up the heat dissipation of the entire device, we introduce the first fin 205 , so that the light-transmitting support substrate 201 can drive more airflow; further, a casing 206 and a second fin 207 are added. The casing 206 can protect the entire device and increase the heat dissipation area of the device. The second fin 207 It can cooperate with the first fins 205 to form a circulating airflow to increase the heat dissipation speed.

Several embodiments of the present invention have been described in detail above, but the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention shall fall within the scope of the patent of the present invention.

Claims (10)

1. A lighting device comprising a light source that emits light, characterized in that it also comprises a light-transmitting support substrate and a fluorescent material provided on one side of the light-transmitting support substrate, the light-transmitting support substrate comprising a ring area and a transparent area, and the The annular area is at least partially provided with fluorescent materials, the annular area is arranged around the transparent area, and a reflective surface for reflecting fluorescence is arranged between the light-transmitting support substrate and the fluorescent material; the light emitted by the light-emitting light source irradiates the annular area A light spot is formed, and the fluorescent material is excited, so that the fluorescent material emits fluorescence; it also includes a motor for driving the light-transmitting support substrate to rotate, and the rotation axis of the light-transmitting support substrate when rotating passes through the center of the annular area. 2 . The lighting device according to claim 1 , further comprising a reflective cup, wherein the reflective cup comprises a reflective area and a light outlet, the light transmission area at least partially covers the light outlet, and the fluorescent light is reflective. 3 . The area emits and is reflected by the reflective area and then exits the light outlet. 3 . The lighting device according to claim 1 , wherein the light-transmitting support substrate is made of a transparent thermally conductive material, or the light-transmitting area is hollowed out. 4 . 4 . The lighting device according to claim 1 , wherein the motor is located at the edge of the light outlet. 5 . 5 . The lighting device according to claim 2 , wherein the reflective cup further comprises a through hole, the light emitted by the light source passes through the through hole to excite the fluorescent material, and the through hole is provided with a concave lens. 6 . , the concave surface of the concave lens is arranged toward the fluorescent material, and the concave surface is coated with a reflective film that transmits laser light and reflects fluorescence. 6 . The lighting device according to claim 5 , wherein the reflection area is a part of an ellipsoid or a paraboloid, and the light spot formed on the fluorescent material by the light emitted by the light source coincides with the focal point of the reflector. 7 . 7. The lighting device according to claim 1 or 2, further comprising a series of first fins, the series of first fins are connected to a side of the light-transmitting support substrate away from the fluorescent material, The series of first fins at least partially cover the annular area, and are used to generate an air flow that flows outward in a radial direction when the light-transmitting support substrate is rotated. 8 . The lighting device according to claim 7 , further comprising a housing, the housing comprises a series of second fins, and at least some adjacent second fins form air ducts, the air duct is used for air ducts. 9 . for guiding the air flow radially outward from the annular region to return at least part of the first fin to the end of the first fin near the center of the annular region to form an air flow loop. 9. A lamp, characterized in that it comprises any one of the lighting devices of claims 1-8. 10. A projection display device, characterized in that it comprises any one of the lighting devices according to claims 1-8.

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