TWI719706B - Wavelength conversion unit and lighting device - Google Patents

Abstract

A lighting device includes a wavelength conversion unit, a driving unit, and a light source. The wavelength conversion unit includes a main body and a fluorescent powder layer. The main body has a cylindrical outer surface. The fluorescent powder layer is disposed on the cylindrical outer surface. The driving unit is configured to drive the wavelength conversion unit to rotate around an axis. The cylindrical outer surface surrounds the axis. The light source is configured to emit light toward the fluorescent powder layer.

Description

Wavelength conversion unit and lighting device

The invention relates to a wavelength conversion unit and a lighting device.

Most of the conventional wavelength conversion devices use a disc color wheel, and the phosphor layer is coated on the disc surface of the disc color wheel. In order to dissipate heat, some conventional technologies are to install a heat dissipation module on the back of the disc color wheel to conduct heat away from the disc color wheel. The aforementioned heat dissipation module is, for example, heat exchange fins.

However, for the aforementioned conventional technology that uses a disc color wheel with heat exchange fins, the overall space is relatively large, which is not conducive to the internal component layout of the lighting device using the conventional wavelength conversion device.

Therefore, how to provide a wavelength conversion unit and a lighting device that can solve the above-mentioned problems is one of the problems that the industry urgently wants to invest in research and development resources to solve.

In view of this, one objective of the present invention is to provide a wavelength conversion unit and a lighting device that can effectively solve the aforementioned problems.

In order to achieve the above objective, according to an embodiment of the present invention, a wavelength conversion unit includes a body and a phosphor layer. The body has a cylindrical outer surface. The phosphor layer is arranged on the cylindrical outer surface.

In one or more embodiments of the present invention, the body has a through channel. The cylindrical outer surface surrounds the through channel.

In one or more embodiments of the present invention, the wavelength conversion unit further includes a blade group. The blade group is arranged in the through channel and fixed to the main body.

In one or more embodiments of the present invention, the material of the phosphor layer includes aluminate (YAG), silicate, nitride, or quantum dots.

In one or more embodiments of the present invention, the material of the binder used in the phosphor layer includes silicone, epoxy resin, aluminum oxide, or aluminum nitride.

In order to achieve the above objective, according to an embodiment of the present invention, a lighting device includes the aforementioned wavelength conversion unit, a driving unit, and a light source. The driving unit is configured to drive the wavelength conversion unit to rotate around the axis. The cylindrical outer surface surrounds the axis. The light source is configured to emit light toward the phosphor layer.

In one or more embodiments of the present invention, the drive unit is connected to the blade group.

In one or more embodiments of the present invention, the through channel has a first opening and a second opening opposite to each other. The lighting device further includes a pipeline and a heat dissipation fluid. The pipeline has a first end and a second end. The first end and the second end are respectively coupled to the first opening and the second opening, so that the through channel and the pipeline jointly form a fluid passage. The heat dissipation fluid is located in the fluid passage.

In one or more embodiments of the present invention, the heat dissipation fluid is gas or liquid.

In one or more embodiments of the present invention, the lighting device further includes a first connecting member and a second connecting member. The first connecting piece is rotatably connected and airtightly communicated between the first opening and the first end of the pipeline. The second connecting piece is rotatably connected and airtightly connected between the second opening and the second end of the pipeline.

In one or more embodiments of the present invention, the lighting device further includes a heat exchange module. The heat exchange module is thermally connected to the pipeline.

In one or more embodiments of the present invention, the lighting device further includes a transmission member. The transmission part is connected with the cylindrical outer surface. The driving unit drives the wavelength conversion unit to rotate via the transmission member.

In order to achieve the above objective, according to an embodiment of the present invention, a lighting device includes a light source, a wavelength conversion unit, and a light splitting filter. The light source is configured to generate excitation light. The wavelength conversion unit has at least one fluorescent section for setting fluorescent powder to convert the excitation light into the received laser light. The wavelength conversion unit is configured to rotate around an axis. The direction in which the excitation light is irradiated to the wavelength conversion unit is orthogonal to the axis. The spectroscopic filter is configured to reflect the excitation light and allow the laser light to pass through, or is configured to reflect the laser light and allow the excitation light to pass through.

In one or more embodiments of the present invention, the number of the aforementioned at least one fluorescent segment is plural. The fluorescent segments are arranged in a ring around the axis. The fluorescent powder set on the fluorescent section is different.

In one or more embodiments of the present invention, the wavelength conversion unit further has a reflection section. The aforementioned at least one fluorescent section and the reflecting section are arranged annularly around the axis.

In one or more embodiments of the present invention, the lighting device further includes a driving unit. The driving unit is configured to drive the wavelength conversion unit to rotate around the axis.

In one or more embodiments of the present invention, the wavelength conversion unit has a through channel.

In one or more embodiments of the present invention, the lighting device further includes a blade group. The blade group is configured to rotate to drive the fluid through the through channel.

In one or more embodiments of the present invention, the blade group is disposed in the through channel and fixed to the wavelength conversion unit.

In summary, the present invention provides a wavelength conversion unit with a cylindrical outer surface on the body and a lighting device using the wavelength conversion unit. Compared with the conventional wavelength conversion device in which the phosphor layer is coated on the front surface of the disc color wheel, since the wavelength conversion unit of the present invention coats the phosphor layer on the cylindrical outer surface, it is effective Reduce the lateral space occupied by the wavelength conversion unit. The body of the wavelength conversion unit of the present invention can also be a hollow cylinder, that is, the body has a through channel through which a heat dissipation fluid (for example, gas or liquid) can pass, and it can also be used as a heat dissipation channel. In addition, the wavelength conversion unit of the present invention can also be provided with a blade group in the through channel of the body. When the driving unit drives the main body to rotate, the blade group located in the through channel will also force the heat dissipation fluid to pass through the through channel at the same time. Thereby, the wavelength conversion unit of the present invention can effectively dissipate the large amount of heat generated when the light source (for example, laser) irradiates the phosphor layer, and lower the temperature of the phosphor layer. In some embodiments where the drive unit is connected to the blade set, the forcedly driven gas can also dissipate the drive unit at the same time. Furthermore, since the illuminating device of the present invention does not need to be provided with a heat exchange module in the inner housing, the overall volume of the inner housing can be smaller than that of the conventional technology, which is beneficial to the internal components of the illuminating device using the wavelength conversion unit of the present invention layout.

The above description is only used to illustrate the problem to be solved by the present invention, the technical means to solve the problem, and the effects produced by it, etc. The specific details of the present invention will be described in detail in the following embodiments and related drawings.

Hereinafter, a plurality of embodiments of the present invention will be disclosed in drawings. For clear description, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is to say, in some embodiments of the present invention, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventionally used structures and elements will be shown in a simple schematic manner in the drawings.

Please refer to Figure 1 and Figure 2. FIG. 1 is a three-dimensional assembly diagram of a lighting device 100 according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing some elements included in the lighting device 100 according to an embodiment of the present invention. As shown in FIG. 1 and FIG. 2, in this embodiment, the lighting device 100 is a projector as an example, but the present invention is not limited to this. The lighting device 100 includes an outer casing 110, inner casings 111 and 112, a wavelength conversion unit 120 and a light source 140. The inner shells 111 and 112 are adjacent to each other. The wavelength conversion unit 120 and the light source 140 are respectively accommodated in the inner casings 111 and 112 to prevent the internal optical elements from being contaminated by external dirt (for example, dust in the air).

The wavelength conversion unit 120 includes a body 121 and a phosphor layer 122. The main body 121 has a cylindrical outer surface 121a, and the material of the main body 121 is different from the phosphor layer 122, preferably a material with higher thermal conductivity, such as metal or thermally conductive ceramic. In this embodiment, the cylindrical outer surface 121a of the main body 121 is a cylindrical surface, but the invention is not limited to this. In practical applications, the cylindrical outer surface 121a of the main body 121 may also be a cone-shaped outer surface, or an outer surface with a cross-section orthogonal to the axis A and a regular polygon (not shown). The phosphor layer 122 is disposed on the cylindrical outer surface 121a. The light source 140 is configured to emit light toward the phosphor layer 122, and the direction of the emitted light is substantially orthogonal to the axis A. Specifically, the phosphor layer 122 is substantially disposed on the cylindrical outer surface 121a along a circular path. Thereby, when the wavelength conversion unit 120 rotates around its axis A and the light source 140 emits light substantially toward this axis A, the light emitted by the light source 140 can continuously illuminate the phosphor layer 122 arranged along the circular path. on.

With the aforementioned structural configuration, compared to the conventional wavelength conversion device in which the phosphor layer is coated on the disc surface of the disc color wheel, since the wavelength conversion unit 120 of this embodiment has the phosphor layer 122 disposed on the column On the outer surface 121a (that is, the phosphor layer 122 will be distributed along the axis A of the main body 121 along the traveling direction of the light emitted by the light source 140), so the lateral space occupied by the wavelength conversion unit 120 can be effectively reduced, and also That is, reducing the space occupied by the plane orthogonal to the traveling direction of the light emitted by the light source 140 is beneficial to the layout of the internal components of the lighting device 100.

In some embodiments, the aforementioned light source 140 is a laser light source, but the present invention is not limited to this.

In some embodiments, the material of the phosphor layer 122 includes aluminate (YAG), silicate, nitride, or quantum dots, but the invention is not limited thereto.

In some embodiments, the material of the binder used in the phosphor layer 122 can be an organic material or an inorganic material, where the organic material is, for example, silicone, epoxy resin, etc., and the inorganic material is, for example, alumina, aluminum nitride, etc. …Etc, but the present invention is not limited to this.

Please refer to Figure 3 and Figure 4. FIG. 3 is a three-dimensional schematic diagram showing some elements included in the lighting device 100 according to an embodiment of the present invention. FIG. 4 is a partial cross-sectional schematic diagram showing the structure in FIG. 3 in an embodiment. As shown in FIGS. 3 and 4, in this embodiment, the body 121 of the wavelength conversion unit 120 has a through channel 121b. The through passage 121b extends substantially along the axis A. The cylindrical outer surface 121a surrounds the through channel 121b. In other words, the body 121 of the wavelength conversion unit 120 is a hollow cylinder. With this configuration, the through channel 121b of the main body 121 can allow the heat dissipation fluid F to pass through, and thus can be used as a heat dissipation channel.

As shown in FIG. 4, in this embodiment, the wavelength conversion unit 120 further includes a blade group 123 and a driving unit 130. The blade group 123 is disposed in the through channel 121b of the main body 121 and fixed to the main body 121 with each other. For example, the blade group 123 may include a plurality of blades. These leaves can be arranged radially. The driving unit 130 is configured to drive the wavelength conversion unit 120 to rotate about the axis A. Specifically, the driving unit 130 is connected to the blade group 123 and is coupled to the body 121 via the blade group 123. With this configuration, when the drive unit 130 drives the main body 121 to rotate through the blade set 123, the blade set 123 located in the through channel 121b will also simultaneously disturb the heat dissipation fluid F or force the heat dissipation fluid F to pass through the through channel 121b, so as to achieve the opposite wavelength. The conversion unit 120 has the effect of forcibly dissipating heat. In this way, the wavelength conversion unit 120 of this embodiment can effectively dissipate the large amount of heat generated when the light source 140 irradiates the phosphor layer 122 and reduce the temperature of the phosphor layer 122. In addition, the forcibly driven heat dissipation fluid F also passes through the driving unit 130, so that the driving unit 130 can be dissipated at the same time. In other embodiments, the number of the blade groups 123 may be two or more, or the blades are also made of thermally conductive material, such as metal, to further conduct heat from the phosphor layer 122 through the body 121 and the blade group 123 to The heat dissipation fluid F dissipates.

As shown in FIGS. 3 and 4, in this embodiment, the through channel 121b has a first opening 121b1 and a second opening 121b2 opposite to each other. The lighting device 100 further includes a pipeline 150. The pipe 150 has a first end 151 and a second end 152. The first end 151 and the second end 152 are respectively coupled to the first opening 121b1 and the second opening 121b2 of the penetrating channel 121b, so that the penetrating channel 121b and the pipeline 150 jointly form a fluid passage. The heat dissipation fluid F is located in the fluid passage. With this configuration, when the drive unit 130 drives the main body 121 to rotate through the blade set 123, the blade set 123 located in the through channel 121b will force the heat dissipation fluid F to circulate along the fluid path formed by the through channel 121b and the pipeline 150. flow. It should be noted that one function of the blade set 123 is to drive the heat dissipation fluid F to pass through the through channel 121b. Therefore, in other embodiments, the blade set 123 does not have to be coupled to the body 121, nor does it need to be arranged in the through channel. In 121b, for example, the blade group 123 is attached to the side of the first opening 121b1 and/or the second opening 121b2 of the through channel 121b, even if the distance is a predetermined distance, the heat dissipation fluid F in the fluid passage can be forced to pass through the through channel. 121b.

Furthermore, since the driving unit 130 drives the wavelength conversion unit 120 to rotate, the pipe 150 is statically disposed in the outer casing 110 of the lighting device 100. In order for the through channel 121b and the pipeline 150 to form a fluid path together, the lighting device 100 further includes a first connector 160a and a second connector 160b. The first connecting member 160a is rotatably connected and air-tightly connected between the first opening 121b1 of the through channel 121b and the first end 151 of the pipeline 150. The second connecting member 160b is rotatably connected and airtightly connected between the second opening 121b2 of the through channel 121b and the second end 152 of the pipe 150, so as to realize the connection between the rotating wavelength conversion unit 120 and the stationary pipe 150 The connection between. In practical applications, each of the first engaging member 160a and the second engaging member 160b may be a rotary bearing with an airtight design, but the present invention is not limited to this.

In addition, in some embodiments, the driving unit 130 can be coupled to the stationary pipeline 150 (for example, directly or indirectly coupled to the inner wall of the pipeline 150), so as to drive the wavelength conversion unit 120 to rotate relative to the pipeline 150 .

In addition, as shown in FIG. 3, the lighting device 100 further includes a heat exchange module 170 (for example, a heat sink or a heat dissipation fin). The heat exchange module 170 is thermally connected to the pipeline 150. Thereby, the heat energy absorbed by the wavelength conversion unit 120 of the heat dissipation fluid F can be cooled by heat exchange through the heat exchange module 170. Please refer to Figure 2 in conjunction. Since the lighting device 100 of this embodiment does not need to be provided with a heat exchange module 170 in the inner housing 111, the overall volume of the inner housing 111 can be smaller than that of the conventional technology, which is beneficial to adopting this embodiment. In this way, the internal component layout of the lighting device 100 of the wavelength conversion unit 120.

In some embodiments where the heat dissipation fluid F uses gas, the aforementioned pipeline 150, the first connector 160a, and the second connector 160b can be directly replaced by the internal flow channel design of the outer casing 110. In other words, in such an embodiment, the through passage 121b of the main body 121 and the internal flow passage of the outer casing 110 can be designed to form a fluid passage together.

Please refer to FIG. 5, which is a three-dimensional schematic diagram showing some components included in a lighting device 100 according to another embodiment of the present invention. As shown in Fig. 5, the difference between this embodiment and the embodiment shown in Figs. 3 and 4 is that the drive unit 230 in this embodiment is located in the through channel 121b and the pipeline 150. In addition to the fluid passage of the illuminating device 100, the illuminating device 100 further includes a transmission member 280. The transmission member 280 is engaged with the cylindrical outer surface 121 a of the main body 121. The driving unit 230 drives the wavelength conversion unit 120 to rotate via the transmission member 280.

In some embodiments, the transmission member 280 is a belt (as shown in FIG. 5), and it is sleeved on the cylindrical outer surface 121a of the main body 121, but the present invention is not limited to this. In some other embodiments, the transmission member 280 may be a gear, and it is meshed with the cylindrical outer surface 121 a of the main body 121 so as to drive the main body 121 to rotate after being driven by the driving unit 230. In some other embodiments, the transmission member 280 may be a roller with a surface with a high friction coefficient, and this surface is in contact with the cylindrical outer surface 121a of the main body 121, so that the main body can be driven after being driven by the driving unit 230 121 turns.

Please refer to FIG. 6, which is a graph showing the relative input power-brightness curve of the wavelength conversion unit 120 of the present invention and the conventional wavelength conversion device in the actual test experiment. As shown in Figure 6, in the actual test experiment, the conventional wavelength conversion device (for example, an aluminum disc with a diameter of about 65 mm) is coated with a phosphor layer of YAG and used with a laser light source Perform irradiation. After the experiment, it is found that when the relative input power of the laser light source is as high as about 80%, the brightness (lumen value) obtained by measuring the conventional wavelength conversion device with the integrating sphere will reach the upper limit, and is about the relative input power of the laser light source. The input power drops sharply from about 85% to about 90%.

On the contrary, as shown in Fig. 6, in the actual test experiment, the wavelength conversion unit 120 of the present invention (for example, the body 121 with a diameter of about 55 mm) is coated with a phosphor layer of YAG and used The laser light source 140 performs irradiation. After the experiment, it will be found that the relative input power of the laser light source 140 and the brightness (lumen value) obtained by the integrating sphere measured by the wavelength conversion unit 120 will approach a linear proportional relationship, and even if the relative input power of the laser light source 140 reaches 90 There is no obvious decline in the corresponding brightness above %. It is obvious that the wavelength conversion unit 120 of the present invention does have an excellent heat dissipation effect. Moreover, it can be seen from Figure 6 that the luminous efficiency of the wavelength conversion unit 120 of the present invention is better than conventional ones in terms of brightness and durability when the diameter of the main body 121 is smaller than the diameter of the aluminum disc of the conventional wavelength conversion device. The known wavelength conversion device is excellent.

Please refer to FIG. 7, which is a schematic diagram showing some elements included in the lighting device 100 according to an embodiment of the present invention. As shown in FIG. 7, in this embodiment, the lighting device 100 further includes lenses 180a, 180b, 180c, and a dichroic filter 190a. Specifically, the light splitting filter 190a is located between the light source 140 and the wavelength conversion unit 120. The lens 180a is located between the light source 140 and the dichroic filter 190a. The lens 180b is located between the light splitting filter 190a and the wavelength conversion unit 120. The light splitting filter 190a is configured to allow the light emitted by the light source 140 to pass (that is, to allow the excitation light to pass), and is configured to reflect the light converted by the wavelength conversion unit 120 (that is, to reflect the received laser light). Whether light can pass through the light splitting filter 190a is based on whether the wavelength range of the light falls within the wavelength range allowed by the light splitting filter 190a, and the principle will not be described in detail here. Therefore, the light emitted by the light source 140 passes through the lens 180a, the dichroic filter 190a, and the lens 180b in sequence to reach the wavelength conversion unit 120. The light converted by the reflection wavelength conversion unit 120 reaches the dichroic filter 190a through the lens 180b, and is reflected by the dichroic filter 190a through the lens 180c to be output.

Please refer to FIG. 8, which is a schematic diagram showing some elements included in the lighting device 100 according to an embodiment of the present invention. As shown in FIG. 8, in this embodiment, the lighting device 100 further includes lenses 180a, 180b, 180c, and a dichroic filter 190b. Specifically, the lens 180a is located between the light source 140 and the dichroic filter 190b. The lens 180b is located between the light splitting filter 190b and the wavelength conversion unit 120. The dichroic filter 190b is located between the lenses 180b and 180c. The dichroic filter 190b is configured to reflect the light emitted by the light source 140 (that is, to reflect the excitation light), and is configured to allow the light converted by the wavelength conversion unit 120 to pass (that is, to allow the received laser light to pass). Therefore, the light emitted by the light source 140 passes through the lens 180a to reach the light splitting filter 190b, is reflected by the light splitting filter 190b, and reaches the wavelength conversion unit 120 through the lens 180b. The light converted by the reflection wavelength conversion unit 120 then sequentially passes through the lens 180b, the dichroic filter 190b and the lens 180c to be output.

In addition, it should be noted that, in addition to a single fluorescent section, the above-mentioned phosphor layer 122 may also include a plurality of fluorescent sections to set different phosphors on some requirements. Please refer to FIG. 9, which is a schematic diagram illustrating a wavelength conversion unit 320 according to an embodiment of the present invention. As shown in FIG. 9, in this embodiment, the wavelength conversion unit 320 includes a main body 121 and a plurality of fluorescent segments 322a and 322b. The fluorescent segments 322a, 322b are arranged in a ring around the axis A. The phosphors arranged on the phosphor sections 322a and 322b are of different types, such as green phosphors and yellow phosphors. Thereby, the above-mentioned excitation light will be sequentially converted into green receiving laser light and yellow receiving laser light as the main body 121 rotates.

Please refer to FIG. 10, which is a schematic diagram illustrating a wavelength conversion unit 420 according to an embodiment of the present invention. As shown in FIG. 10, in this embodiment, the wavelength conversion unit 420 includes a main body 121, fluorescent sections 422a and 422b, and a reflective section 423. Different phosphors are arranged on the phosphor sections 422a and 422b to convert the excitation light into different colors of the received laser light. The fluorescent sections 422a, 422b and the reflective section 423 are arranged in a ring around the axis A. Thereby, as the main body 121 rotates, the wavelength conversion unit 420 can sequentially generate the received laser light and the reflected excitation light and output it to the rear end.

From the above detailed description of the specific embodiments of the present invention, it can be clearly seen that the present invention provides a wavelength conversion unit with a cylindrical outer surface on its body and a lighting device using the same. Compared with the conventional wavelength conversion device in which the phosphor layer is coated on the front surface of the disc color wheel, since the wavelength conversion unit of the present invention coats the phosphor layer on the cylindrical outer surface, it is effective Reduce the lateral space occupied by the wavelength conversion unit. The body of the wavelength conversion unit of the present invention can also be a hollow cylinder, that is, the body has a through channel through which a heat dissipation fluid (for example, gas or liquid) can pass, and it can also be used as a heat dissipation channel. In addition, the wavelength conversion unit of the present invention can also be provided with a blade group in the through channel of the body. When the driving unit drives the main body to rotate, the blade group located in the through channel will also force the heat dissipation fluid to pass through the through channel at the same time. Thereby, the wavelength conversion unit of the present invention can effectively dissipate the large amount of heat generated when the light source (for example, laser) irradiates the phosphor layer, and lower the temperature of the phosphor layer. In some embodiments where the drive unit is connected to the blade set, the forcedly driven gas can also dissipate heat from the drive unit at the same time. Furthermore, since the illuminating device of the present invention does not need to be provided with a heat exchange module in the inner housing, the overall volume of the inner housing can be smaller than that of the conventional technology, which is beneficial to the internal components of the illuminating device using the wavelength conversion unit of the present invention layout.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone who is familiar with the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be subject to those defined by the attached patent scope.

100: lighting device

110: outer shell

111, 112: inner shell

120, 320, 420: wavelength conversion unit

121: body

121a: cylindrical outer surface

121b: Through channel

121b1: first opening

121b2: second opening

122: Phosphor layer

123: Blade Group

130, 230: drive unit

140: light source

150: pipeline

151: first end

152: second end

160a: the first connecting piece

160b: The second connecting piece

170: Heat Exchange Module

180a, 180b, 180c: lens

190a, 190b: Spectroscopic filter

322a, 322b, 422a, 422b: fluorescent section

423: reflection section

280: Transmission parts

A: axis

F: Cooling fluid

In order to make the above and other objectives, features, advantages and embodiments of the present invention more comprehensible, the description of the accompanying drawings is as follows: Fig. 1 is a three-dimensional assembly diagram of a lighting device according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing some elements included in the lighting device according to an embodiment of the present invention. FIG. 3 is a three-dimensional schematic diagram showing some elements included in the lighting device according to an embodiment of the present invention. FIG. 4 is a partial cross-sectional schematic diagram showing the structure in FIG. 3 in an embodiment. FIG. 5 is a three-dimensional schematic diagram showing some elements included in the lighting device according to an embodiment of the present invention. Fig. 6 is a graph showing the relative input power-brightness curve of the wavelength conversion unit of the present invention and the conventional wavelength conversion device in an actual test experiment. FIG. 7 is a schematic diagram showing some elements included in the lighting device according to an embodiment of the present invention. FIG. 8 is a schematic diagram showing some elements included in the lighting device according to an embodiment of the present invention. FIG. 9 is a schematic diagram showing a wavelength conversion unit according to an embodiment of the present invention. FIG. 10 is a schematic diagram showing a wavelength conversion unit according to an embodiment of the present invention.

111, 112: inner shell

120: Wavelength conversion unit

121: body

121a: cylindrical outer surface

122: Phosphor layer

140: light source

150: pipeline

151: first end

152: second end

160a: the first connecting piece

160b: The second connecting piece

A: axis

Claims (8)

A lighting device, comprising: a wavelength conversion unit, comprising: a body with a cylindrical outer surface and a through channel, the through channel having a first opening and a second opening opposite to each other; and a phosphor layer, Disposed on the cylindrical outer surface; a driving unit configured to drive the wavelength conversion unit to rotate around an axis, wherein the cylindrical outer surface surrounds the axis; a light source configured to emit light toward the phosphor layer; A pipeline having a first end and a second end, the first end and the second end are respectively coupled to the first opening and the second opening, so that the through channel and the pipeline jointly form a fluid passage ; And a heat dissipation fluid located in the fluid passage. The lighting device according to claim 1, wherein the cylindrical outer surface surrounds the through passage. The lighting device according to claim 2, wherein the wavelength conversion unit further includes a blade group, and the blade group is disposed in the through channel and fixed to the main body. The lighting device according to claim 3, wherein the drive unit is connected to the blade group. The lighting device according to claim 1, wherein the heat dissipation fluid is gas or liquid. The lighting device according to claim 1, further comprising: a first connecting member rotatably connected and airtightly connected between the first opening and the first end of the pipeline; and a second connecting member The piece is rotatably connected and airtightly communicated between the second opening and the second end of the pipeline. The lighting device according to claim 1, further comprising a heat exchange module, and the heat exchange module is thermally connected to the pipeline. The lighting device according to claim 1, further comprising a transmission member, the transmission member is engaged with the cylindrical outer surface, and the driving unit drives the wavelength conversion unit to rotate through the transmission member.

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