WO2019024499A1

WO2019024499A1 - Color wheel, light source system and projection system

Info

Publication number: WO2019024499A1
Application number: PCT/CN2018/077768
Authority: WO
Inventors: 戴达炎; 李屹
Original assignee: 深圳市光峰光电技术有限公司
Priority date: 2017-08-01
Filing date: 2018-03-01
Publication date: 2019-02-07
Also published as: CN207164450U

Abstract

A color wheel (40), a light source system (100) comprising the color wheel (40), and a projection system comprising the light source (100); the color wheel comprises a wavelength conversion layer (41), a heat sink (42), a filter (43) and a driving device (44); the wavelength conversion layer (41) is disposed on a top surface of the heat sink (42); one end of the heat sink (42) near the radial direction of the driving device (44) is connected to the filter (43); the outer edge of the filter (43) is connected to the heat sink (42), and the middle part of the filter (43) is connected to the driving device (44); the driving device (44) is connected to the middle part of the filter (43) and drives the filter (43) to rotate. The present invention has advantages such as being thin and light weight and having a simple assembly process.

Description

Color wheel, light source system and projection system

Technical field

The utility model relates to the field of projection display technology, in particular to a color wheel, a light source system and a projection system.

Background technique

At present, laser light sources are becoming more and more widely used in display (such as projection field) and illumination. Due to the high energy density and small optical expansion, laser light sources have gradually replaced bulbs and LEDs in the field of high-brightness light sources. light source. Among them, the light source system that uses the first light source to excite the phosphor to generate the required light (such as the blue laser to excite the yellow phosphor to produce white light) has become the mainstream of the application because of its high luminous efficiency, good stability and low cost. However, how to further reduce the volume of the light source system is one of the important issues that the industry is trying to solve. Especially for the light source system used in the micro-injection field, the smaller light source system is more conducive to miniaturization of the terminal, and also increases The possibility of battery-driven driving in the micro-investment field.

technical problem

At present, the color wheel in the light source system of the related art mainly performs heat dissipation by forced air flow, that is, the heat of the color wheel is dissipated by the flow of air generated by the rotation of the color wheel, so that the heat dissipation effect of the light source system is not good. Especially for the realization of the integrated color wheel that generates the laser and filter function, there is currently no good heat dissipation technical solution, thus limiting the miniaturization of the color wheel and the miniaturization of the light source system.

Technical solution

In view of the above, it is necessary to provide a color wheel with good heat dissipation and small volume, and it is also necessary to provide a light source system using the above color wheel and a projection system using the same.

a color wheel comprising a wavelength conversion layer, a heat sink, a filter and a driving device, wherein the wavelength conversion layer is disposed on a top surface of the heat sink, the heat sink is adjacent to one end of the driving device and the filter a light sheet is connected, an outer edge of the filter is connected to the heat sink and a middle portion of the filter is connected to the driving device, the driving device is connected to a middle portion of the filter and drives the The filter rotates.

A light source system employing a color wheel as described above.

A projection system employing a light source system as described above.

Beneficial effect

The color wheel provided by the utility model has the advantages of thin thickness, light weight and simple assembly process. Moreover, the weight reduction of the driving device can also increase the service life of the driving device, thereby improving the service life of the light source system. In addition, the light source system having the color wheel can be correspondingly reduced, and has the advantages of good heat dissipation, high brightness, and good color, which enables the volume of the end product having the light source system to be made smaller.

DRAWINGS

FIG. 1 is a schematic structural view of an embodiment of the present invention.

2 is a schematic structural view of the color wheel shown in FIG. 1.

3 is a schematic top plan view of the color wheel shown in FIG. 2.

4 is a schematic structural view of another embodiment of the color wheel structure shown in FIG. 1.

FIG. 5 is a schematic top plan view of the color wheel shown in FIG. 4. FIG.

主要元件符号说明Main component symbol description

Light source system 100

Excitation source 10

Filter device 20

Collection lens 30

Color wheel 40, 40a

Wavelength conversion layer 41, 41a

Heat sink 342, 42a

Main body 421, 421a

Step structure 34211, 4211a

Top surface 34212

Bottom surface 34212a

Side surface 34213, 4231a

Heat dissipation unit 422, 422a

Filters 43, 43a

Drive unit 44, 44a

Reflecting device 50

Concentrating device 60

Uniform rod 70

The present invention will be further described in conjunction with the above drawings in the following detailed description.

Embodiments of the invention

Please refer to FIG. 3 to FIG. 5 simultaneously. FIG. 3 is a schematic structural view of a light source system 100 according to an embodiment of the present invention; FIG. 4 is a schematic structural view of the color wheel shown in FIG. 3; A schematic plan view of the color wheel shown. The light source system 100 includes an excitation light source 10, a filter device 20, a collection lens 30, a color wheel 40, a reflection device 50, a concentrating device 60, and a light homogenizing rod 70. The excitation light source 10 is for generating excitation light, which is sequentially passed through the filter device 20, the collection lens 30, and then incident on the color wheel 40. The color wheel 40 is irradiated with excitation light to generate a laser beam. The laser light is collected by the collecting lens 30 and then incident on the filter device 20, and then the laser light is reflected by the filter device 20 to reflect the reflecting device 50. The reflecting device 50 reflects the received laser light to the color wheel 40. The laser light is incident on the light homogenizing rod 70 after passing through the color wheel 40, and is homogenized by the light homogenizing rod 70 to transmit light.

The excitation light source 10 is used to emit excitation light, which may be a semiconductor diode or a semiconductor diode array such as a laser diode (LD) or a light emitting diode (LED). The excitation light may be blue light, purple light or ultraviolet light, etc., but is not limited to the above.

The filter device 20 is located on the optical path where the excitation light emitted by the excitation light source 10 is located. Specifically, the filter device 20 allows transmission of excitation light emitted from the excitation light source 10, and is capable of reflecting a laser light generated by the excitation light to excite the color wheel.

In the embodiment, the excitation light source 10 emits blue excitation light, the excitation is yellow received laser light, and the filter device 20 is a blue anti-yellow filter 102, that is, the filter device 20 allows the blue excitation light to pass through, and additionally reflects the yellow laser light. The filter device 20 is disposed at a position capable of emitting the laser light to the reflection device 50. In the present embodiment, the filter device 20 is disposed at an angle of substantially 45 degrees between the emission direction of the excitation light.

The collecting lens 30 is located on the optical path where the excitation light transmitted by the filter device 20 is located, which can simultaneously collect the received laser light and transmit the received laser light to the color wheel 40. Wherein the laser received by the color wheel 40 is excited by the excitation light,

The color wheel 40 is located on the optical path where the excitation light emitted by the collecting lens 30 is located, and is capable of receiving the excitation light emitted by the collecting lens 30 and converting the excitation light into laser light of different wavelengths. The color wheel 40 includes a wavelength conversion layer 41, a heat sink 42, a filter 43, and a driving device 44. The wavelength conversion layer 41 is disposed on the surface of the heat sink 42. Both ends of the filter 43 are connected to the heat sink 42 and the driving device 44, respectively. The driving device 44 is coupled to the filter 43 and drives the filter 43 to rotate.

The wavelength conversion layer 41 is disposed on the surface of the heat sink 42 and the thickness of the wavelength conversion layer 41 is uniformly disposed. The wavelength conversion layer 41 has an annular shape as a whole. The wavelength conversion layer 41 is configured to receive the excitation light and generate a laser light under excitation of the excitation light. The wavelength conversion layer 41 includes a wavelength converting material for absorbing excitation light and generating laser light of different wavelengths. The wavelength converting material may be a phosphorescent material such as a phosphor, or a nanomaterial such as a quantum dot or a phosphor. The wavelength conversion layer 41 includes at least two wavelength conversion sections, and each of the wavelength conversion sections is provided with a different fluorescent material. Each of the wavelength conversion sections is different in color of the laser light generated when the excitation light is irradiated. Further, the wavelength conversion layer 41 further includes at least one reflective segment for reflecting the excitation light.

In the present embodiment, the conversion material of the wavelength conversion layer 41 is a phosphor, and the wavelength conversion layer 41 is a phosphor layer. The phosphor layer receives the excitation light and is excited by the excitation light to generate a laser light.

The heat sink 42 has an annular shape as a whole. The top surface of the heat sink 42 is provided with a wavelength conversion layer 41 and is connected to the filter 43. The heat sink 42 includes a body portion 421 and a heat sink portion 422. The main body portion 421 is coupled to the main body portion. In the present embodiment, the heat dissipation portion 422 is provided at the bottom of the main body portion 421. Of course, in other embodiments, the heat dissipating portion 422 may be disposed at a side portion of the main body portion 421 or at the same time at a bottom portion and a side portion of the main body portion 421, that is, the heat dissipating portion 422 simultaneously The bottom and side connections are described.

The top surface of the main body portion 421 is connected to the wavelength conversion layer 41, and one end thereof in the radial direction of the driving device 44 is connected to the filter 43. The main body portion 421 can conduct heat, and the main body portion 421 can conduct heat generated by the wavelength conversion layer 41 to the heat dissipation portion 422. Specifically, a step structure 4211 is disposed at an end of the bottom of the main body portion 421 near the driving device 44. The step structure 4211 includes a top surface 4212 and a side surface 4213. In the present embodiment, the top surface 4212 is connected to the filter 43. The side surface 4213 has a gap with the filter 43 before, and the height of the side surface 4213 is the same as the thickness of the filter 43. Of course, in other embodiments, the side surface 4213 may also be disposed in contact with the side surface of the filter 43 , and the height of the side surface 4213 and the thickness of the filter 43 may also be The present invention is not limited thereto.

The heat dissipating portion 422 is disposed at the bottom of the main body portion 421. In the embodiment, the heat dissipating portion 422 has an annular shape as a whole. The heat radiating portion 422 is for receiving heat from the main body portion 421 and dissipating heat from the main body portion 421. The heat radiating portion 422 can accelerate heat dissipation of the main body portion 421, thereby lowering the temperature of the main body portion 421 and finally lowering the temperature of the wavelength conversion layer 41. The heat dissipation portion 422 may be a circular ring, a columnar protrusion, a sheet-like protrusion or the like distributed along the bottom of the main body portion 421. In the present embodiment, the heat dissipation portion 422 is a heat dissipation blade that is in the form of a sheet-like projection. Of course, in other embodiments, the heat dissipating portion 422 may have other shapes, which is not limited by the present invention.

The filter 43 has a disk-like structure as a whole. The filter 43 may be an integral disk-shaped filter, or may be formed by splicing a plurality of fan-shaped or fan-ring shaped filters having different plating films, wherein when the plurality of coatings have different coatings When the filter is in the shape of a fan ring, a through hole is formed in a middle portion of the filter formed by the plurality of fan ring shapes having different plating films. In the embodiment, the filter 43 has a circular through hole in the middle. Of course, it can be understood that the filter 43 is an integral disk-shaped filter or a complete disk-shaped structure formed by splicing a plurality of differently coated fan-shaped filters. Light film. In other embodiments, the central portion of the filter 43 may not include a circular through hole, that is, the filter 43 may be an integral circular plate-shaped filter having a through hole in the middle. A filter having a through hole in the middle may be formed by splicing a plurality of filters having a fan shape having different plating films. The utility model does not limit this. An outer edge of the filter 43 is coupled to the main body portion 421, and a central portion of the filter 43 is coupled to the driving device 44 and is driven to rotate by the driving device 44. The filter 43 is for filtering the laser light and absorbing light of some wavelengths therein to finally obtain a laser beam of a desired wavelength. In this embodiment, the filter 43 further includes a filter region for filtering the excitation light reflected by the color wheel; it can be understood that the filter region is used for filtering the blue excitation light. A blue filter region of light, and the filter region has a scattering material for scattering the excitation light.

The driving device 44 is connected to the middle of the filter 43 and drives the filter 43 to rotate. It can be understood that when the middle portion of the filter 43 is a disc-shaped structure without a circular through hole, the driving device 44 is connected to the middle portion of the filter 43 at this time, specifically, the driving. The device is connected to the middle of the filter 43. At this time, the filter 43 may be an integral disk-shaped filter, or may be a complete disk-like structure formed by splicing a plurality of fan-shaped filters having different plating films. When the middle portion of the filter 43 is a disk-like structure having a circular through hole, the driving device 44 is also connected to the middle portion of the filter 43 at this time. Specifically, the driving device 44 and Portions of the edge of the circular through hole adjacent to the filter 43 are connected. Similarly, the filter 43 may be an integral disk-shaped filter having a through hole in the middle, or may be formed by splicing a plurality of filter-shaped filters having different coatings. A filter with a through hole. In addition, it can be understood that the filter formed by the integral disk-shaped filter or the filter of the fan-shaped filter having different plating films has no through holes in the middle thereof. In order to be closed, the driving device can be connected to each other by bonding or snapping the driving ends of the two filters to the middle of the two filters. When the filter 43 rotates, the wavelength conversion layer 41 and the heat sink 42 are also rotated. In the embodiment, the driving device is a motor.

Referring to FIG. 6 and FIG. 7 together, in another embodiment of the present invention, the structure of the color wheel 40a is substantially the same as that of the color wheel 40, and the same includes the wavelength conversion layer 41a, the heat sink 42a, and the filter. The light sheet 43a and the driving device 44a. The color wheel 40 is different from the color wheel 40a in that the structure of the heat sink 42 is different.

Specifically, the heat sink 42a also includes a main body portion 421a and a heat dissipating portion 422a, and the main body portion 421a of the heat sink 42a is different from the main body portion 421 of the heat sink 42.

A stepped structure 4211a is disposed at an end of the main body portion 421a near the driving device 44a. The step structure includes a bottom surface 4212a and a side surface 4213a. In the present embodiment, the bottom surface 4212a is connected to the filter 43a. The side surface 4213a has a gap with the filter 43 before, and the height of the side surface 4213a is the same as the thickness of the filter 43. Of course, in other embodiments, the side surface 4213a may also be disposed in contact with the side surface of the filter 43a, and the height of the side surface 4213a and the thickness of the filter 43a may also be The present invention is not limited thereto. At this time, the bottom portion of the main body portion 421a has a large area, and the bottom portion of the main body portion 421a has a larger area for the heat dissipating portion 422a, thereby further improving the heat dissipating capability of the color wheel 40a.

The reflecting device 50 is configured to receive the received laser light reflected from the filtering device 20, and reflect the reflected laser light again and reflect it to the collecting device 60. The reflecting device 50 is a full-spectrum mirror that is capable of reflecting light of different wavelengths.

The concentrating device 60 is disposed on the top of the filter 43 and spaced apart from the filter 43 by a certain distance. The concentrating device 60 is disposed on the optical path of the laser light reflected by the reflecting device 50, and is capable of concentrating the laser light.

The light homogenizing rod 70 is disposed at the bottom of the filter 43 and spaced apart from the filter 43 by a certain distance. The homogenizing rod 70 receives the laser light that has been subjected to the filtering treatment by the filter 43, and performs a homogenizing treatment on the laser light, and finally emits the laser light that has been subjected to the homogenizing treatment.

In order to more clearly understand the working principle of the light source system 100, the illumination process of the light source system 100 will be described in its entirety.

First, excitation light is emitted from the excitation light source 10, and the excitation light is sequentially passed through the filter device 20 and the collecting lens 30 to be irradiated to the surface of the wavelength conversion layer 41 of the color wheel 40. The wavelength conversion layer 41 is irradiated with the excitation light to emit a corresponding laser light. The wavelength conversion layer 41 includes a plurality of segments. Different fluorescent materials are disposed in each of the segments, and the fluorescent material in each of the segments emits laser light of different colors when irradiated with the excitation light. Furthermore, the wavelength conversion device 41 further comprises a reflective section for reflecting the excitation light, the reflective section being exclusively for reflecting the excitation light.

The laser light is incident on the collecting lens 30 and converted into parallel light by the collecting lens 30. The parallel light passing through the collecting lens 30 is irradiated to the filter device 20 and reflected by the filter device 20 to the reflecting device 50. The reflecting device 50 reflects the laser light reaching its surface to the light collecting device 60. The concentrating device 60 converges the laser light to reach the surface of the color wheel 40. The filter 43 of the color wheel 40 filters the laser light and obtains a laser beam of a desired wavelength. In particular, the filter further includes a filter region that filters the excitation light. The filter region is configured to filter the excitation light reflected by the reflective segment.

The light homogenizing rod 70 receives the laser light that has been processed by the filter 43 and is subjected to a light-homing treatment.

The present invention also provides a projection system that includes a light source system 100 as described above.

Claims

A color wheel, comprising: a wavelength conversion layer, a heat sink, a filter, and a driving device, wherein the wavelength conversion layer is disposed on a top surface of the heat sink, and the heat sink is adjacent to the driving device One end of the radial direction is connected to the filter, an outer edge of the filter is connected to the heat sink, and a middle portion of the filter is connected to the driving device, the driving device and the driving device The middle of the filter is connected and drives the filter to rotate.

The color wheel according to claim 1, wherein the heat sink comprises a main body portion and a heat dissipating portion, wherein the heat dissipating portion is disposed on a bottom surface of the main body portion, and the main body portion is adjacent to the driving portion One end of the device in the radial direction is connected to the filter.

3. The color wheel of claim 2, wherein the heat dissipating portion is a heat dissipating blade.

The color wheel according to claim 2, wherein a bottom portion of the bottom portion of the main body portion adjacent to the driving device is provided with a stepped structure, the stepped structure including a top surface and a side surface, the top surface and The filters are connected.

The color wheel according to claim 2, wherein a top end of the main body portion near the driving device is provided with a stepped structure, and the stepped structure includes a bottom surface and a side surface, the bottom surface and The filters are connected.

6. A color wheel according to claim 1 wherein the wavelength converting layer comprises at least two wavelength converting sections and each of said wavelength converting sections is provided with a different fluorescent material than the other sections.

7. A color wheel according to claim 1 wherein the filter has a through hole in the middle.

A light source system, characterized in that the light source system employs the color wheel according to any one of claims 1-7.

9. The light source system of claim 8, wherein the light source system comprises an excitation light source, a filter device, a collection lens, a reflection device, a concentrating device, a homogenizing rod, and the color wheel, the excitation The light source is configured to emit excitation light, which is sequentially passed through the filter device and the collection lens, and then incident on a wavelength conversion layer of the color wheel, and the wavelength conversion layer is excited by the excitation light to generate a laser beam, which is collected by the collecting lens and incident on the filter device, and the laser light is sequentially reflected by the filter device and the reflecting device and then incident on the color wheel filter The filter is configured to filter the laser light, and the laser light passing through the filter is incident on the light homogenizing rod and is homogenized by the light homogenizing rod to transmit light.

10. A projection system, characterized in that the projection system employs the light source system of claim 8.