WO2019134265A1

WO2019134265A1 - Light source system and projection device

Info

Publication number: WO2019134265A1
Application number: PCT/CN2018/080873
Authority: WO
Inventors: 郭祖强; 杨炳柯; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2018-01-03
Filing date: 2018-03-28
Publication date: 2019-07-11
Also published as: CN109991802A

Abstract

A light source system and a projection device. The light source system (100) comprises a main light source (110) and a wavelength conversion apparatus (130). The main light source (110) is used for emitting laser as the excitation light. The wavelength conversion apparatus (130) comprises a base plate (131). The base plate (131) comprises a columnar side wall, and the outer surface of the side wall is provided with a wavelength converting material. The wavelength converting material is used for receiving excitation light, performing wavelength conversion on the excitation light, and outputting excited light of at least one color. The height of the side wall is compatible with the size of the facula of the incident excitation light irradiating on the sidewall. The height of the side wall of the base plate (131) of the wavelength conversion apparatus (130) can be quite thin, facilitating the thinning of the light source system (100). The cross section of the base plate (131) can be quite large, thereby enhancing the conversion efficiency of the wavelength conversion apparatus (130) and enhancing the brightness of the light source system (100) and the projection quality of the projection device.

Description

Light source system and projection equipment

Technical field

The present invention relates to the field of projection technologies, and in particular, to a light source system and a projection device.

Background technique

This section is intended to provide a context or context for the specific embodiments of the invention set forth in the claims. The description herein is not admitted to be prior art as it is included in this section.

The thin-plate color wheel is widely used, the technology is relatively mature, and there are various options for design choice. However, for the color wheel of this structure, when the color wheel is made larger to improve the heat dissipation performance of the color wheel, the thickness of the light source system is increased, which is contrary to the thinning that we hope to achieve.

Summary of the invention

The invention provides a thinned light source system, and the illumination also provides a projection device.

A light source system comprising:

a main light source for emitting laser light as excitation light;

a wavelength conversion device comprising a substrate, the substrate comprising a cylindrical sidewall, a thermal conversion material disposed on an outer surface of the sidewall, the wavelength conversion material for receiving the excitation light and The excitation light is wavelength converted and emits a laser of at least one color having a height dimension at least comparable to the size of the excitation spot incident thereon.

A projection apparatus to which a light source system as described above is applied.

The sidewall of the cylindrical substrate on the wavelength conversion device in the light source system provided by the present invention is equivalent to the size of the excitation light spot incident thereon, that is, the height of the cylindrical sidewall of the substrate of the wavelength conversion device can be made thin. The shape of the light source system to which the wavelength conversion device is applied can be made thin, which is advantageous for the thin design of the light source system. In addition, the cross section of the substrate can be large, the heat dissipation performance of the wavelength conversion device is improved, and the optical power can be withstood, the energy utilization rate of the wavelength conversion device is improved, and the light source system is improved. Brightness and projection quality of the projection system.

DRAWINGS

FIG. 1 is a schematic structural diagram of a light source system according to a first embodiment of the present invention.

2 is a schematic structural view of a second embodiment of the wavelength conversion device shown in FIG. 1.

FIG. 3 is another perspective view of the wavelength conversion device shown in FIG.

FIG. 4 is a schematic structural diagram of a light source system according to a second embodiment of the present invention.

Fig. 5 is a schematic view showing another embodiment of the second embodiment shown in Fig. 4.

Fig. 6 is a partial structural schematic view showing a non-conversion area of the wavelength conversion device shown in Fig. 5.

Main component symbol description

光源系统 Light source system	100、300、400100, 300, 400
主光源Main light source	110、410110,410
发光体illuminator	111、371111,371
匀光器件 Homogenizing device	112112
波长转换装置 Wavelength conversion device	130、230、330、430130, 230, 330, 430
基板 Substrate	131、231、431131, 231, 431
区段Section	RR
区段Section	GG
非转换区Non-conversion zone	BB
轮辐区Spoke area	SS

固定件Fastener	233233
驱动单元 Drive unit	139、239139, 239
引导装置 Guiding device	150、350、450150, 350, 450
会聚透镜 Converging lens	151、373151, 373
第一反射元件First reflective element	152a、352a152a, 352a

第一分光滤光片First spectroscopic filter	152b、352b152b, 352b
收集透镜组Collecting lens group	154、454154, 454
中继透镜 Relay lens	155、375155, 375
匀光器件Homogenizing device	156、372156,372
补充光源 Supplementary light source	370370
散射元件 Scattering element	374374

The invention will be further illustrated by the following detailed description in conjunction with the accompanying drawings.

Detailed ways

Please refer to FIG. 1 , which is a schematic structural diagram of a light source system 100 according to a first embodiment of the present invention. The light source system 100 provided by the invention has uniform spot color and brightness and can be applied to a projection device.

The light source system 100 includes a main light source 110, a wavelength conversion device 130, and a guiding device 150. Wherein, the main light source 110 is configured to emit excitation light; the wavelength conversion device 130 is provided with a wavelength conversion material for generating a laser light of at least one color under the action of the excitation light; and a guiding device 150 for guiding the The excitation light is incident on the wavelength conversion device 130, and the light guided from the wavelength conversion device 130 is emitted from the light source system 100.

Specifically, the main light source 110 includes an illuminator 111 for generating excitation light and a light homogenizing device 112 that multiplexes the excitation light.

Further, the main light source may be a blue light source that emits blue excitation light. It can be understood that the main light source is not limited to the blue light source, and the main light source may also be a purple light source, a red light source or a green light source. In the present embodiment, the illuminant 111 is a blue laser for emitting blue laser light as excitation light. It can be understood that the illuminant 111 can include one, two blue lasers or a blue laser array, and the number of lasers can be selected according to actual needs.

The light homogenizing device 112 is configured to emit the excitation light and then emit it. In this embodiment, the light-sharing device 112 is a light-diffusing rod. It is to be understood that in other embodiments, the light-homogenizing device 112 may include a fly-eye lens or the like, and is not limited thereto.

The wavelength conversion device 130 provided with a filter layer (not shown) includes a substrate 131 having a cylindrical shape, and the wavelength conversion material is disposed on the outer surface of the side wall of the substrate 131, and the wavelength conversion material is used to receive the excitation light. And wavelength conversion of the excitation light. The wavelength conversion device 130 is further provided with a driving unit 139. The substrate 131 is periodically rotated about the rotation axis by the driving unit 139, and the projection of the substrate 131 along the direction of propagation of the incident light is strip-shaped. The filter layer is used to color the light emitted from the wavelength conversion device 130 to improve the color purity of the emitted light.

The outer surface of the side wall of the substrate 131 is provided with a conversion region and a non-transition region B, the conversion region includes a segment R and a segment G, and the segment R and the segment G are respectively provided for generating red under the excitation light And a green wavelength-converting material that is subjected to laser light, and the non-conversion region B is provided with a scattering material for scattering the excitation light and then emitting. The section R, the section G and the non-conversion zone B are alternately located on the optical path where the excitation light is located, driven by the driving unit 139.

The connection area between the section R, the section G, and the non-conversion zone B is the spoke zone S. When the wavelength conversion device 130 is rotated at a position such that the excitation light spot is irradiated on the spoke region S, two different colors of light are emitted. For optomechanical systems, this mixed light cannot be handled. Therefore, in an actual product, it is usually necessary to discard this portion of light, and a typical spoke area S angle is 12°, so that the three-stage wavelength conversion device 130 is used in the period in which the wavelength conversion device 130 rotates one revolution. The light energy generated by the angle of 36° cannot be utilized. This causes a decrease in the energy utilization rate of the wavelength conversion device 130.

In order to solve the above problem, the height dimension of the wavelength conversion device 130 can be made very thin, that is, the size of the wavelength conversion device 130 in the direction parallel to the rotation axis can be made thin, and at least excited with the illumination on the wavelength conversion device 130. The light spot size is equivalent, which is advantageous for the light source system 100 to be thinned; in addition, the cross section of the wavelength conversion device 130 (the cross section perpendicular to the rotation axis) can be made very large, and the wavelength conversion device occupied by the excitation light spot The angle on the side wall of the 130 is small, thereby reducing the efficiency loss caused by the spoke area S; and at the same time, the heat dissipation performance of the wavelength conversion device 130 is also improved due to the large contact area with air, thereby improving the conversion efficiency and energy of the wavelength conversion device 130. Utilization rate.

Please refer to FIG. 2 to FIG. 3 . FIG. 2 is a schematic structural diagram of a second embodiment of the wavelength conversion device 130 shown in FIG. 1 . FIG. 3 is another perspective view of the wavelength conversion device 230 shown in FIG. 2. In the second embodiment of the wavelength conversion device 230, the wavelength conversion device 230 is further provided with a fixing member 233. The driving unit 239 is disposed on the inner side of the substrate 231. One end of the fixing member 233 is connected to the driving unit 239, and the other end of the fixing member 233 is connected to the substrate. The inner surface of the side wall of the 231 corresponds to the area of the spoke area S, so that the substrate 231 can be periodically rotated along with the driving unit 239, and the structure is made more compact. For the three-stage wavelength conversion device 230, three fixing members 233 are provided. In another embodiment, for the two-stage wavelength conversion device 230, the conversion region of the wavelength conversion device 230 emits only one color of the received laser light, and two fixing members 233 are disposed.

It can be understood that the inner sidewall of the substrate 231 may be provided with a heat dissipating device, such as a heat sink, to further improve the heat dissipation performance of the wavelength conversion device 230.

Referring to FIG. 1 further, the guiding device 150 includes a condenser lens 151, a first reflective element 152a, a first beam splitting filter 152b, a collecting lens group 154, a relay lens 155, and a light homogenizing device 156. The excitation light is sequentially concentrated by the condenser lens 151, the first spectral filter 152b is transmitted, and the collecting lens group 154 is concentrated, and then incident on the wavelength conversion device 130.

The laser light emitted by the wavelength conversion device 130 is sequentially collimated by the collecting lens group 154, reflected by the beam splitting light element 152a, and adjusted by the divergence angle of the relay lens 155, and then incident on the light homogenizing device 156;

The scattered excitation light emitted from the wavelength conversion device 130 is sequentially collimated by the collecting lens group 154, the first spectral filter 152b is transmitted, the first reflective element 152a is reflected, the first spectral filter 152b is transmitted, and the relay lens 155 is relayed. Adjusting the divergence angle and then incident on the light homogenizing device 156;

The laser and the excitation light are emitted from the light source system 100 after being homogenized in the light homogenizing device 156.

The first reflective element 152a and the first spectral filter 152b are disposed between the main light source 110 and the wavelength conversion device 130. The first spectral filter 152b is configured to transmit the excitation light and reflect the laser light, the first reflective element 152a is configured to reflect the excitation light, and the first spectral filter 152b is stacked with the first reflective element 152a. The first spectral filter 152b is remote from the primary light source 110 with respect to the first reflective element 152a. The first spectral filter 152b is longer than the first reflective element 152a, and the unconverted excitation light is transmitted through the first spectral filter 152b, and a portion thereof is incident on the first reflective element 152a to enter the light homogenizing device 156. The remaining portion of the excitation light passes through the first spectral filter 152a without being received by the first reflective element 152b, improving the purity and projection quality of the outgoing primary light.

Specifically, the first spectral filter 152b is for transmitting blue excitation light and reflecting red and green received laser light, and the first spectral filter 152b may be a blue anti-yellow dichroic filter. The first reflective element 152a is for reflecting blue excitation light and may be a total reflection mirror or a band pass filter.

It can be understood that both the first spectral filter 152b and the first reflective component 152 can be respectively disposed to pass light of a predetermined wavelength range to perform color correction on the incident light.

The collection lens group 154 is disposed adjacent to the wavelength conversion device 130 for collecting the light incident to the wavelength conversion device 130 and collimating the light emitted from the wavelength conversion device 130. In this embodiment, the collecting lens group 154 is a convex lens; in an embodiment, the collecting lens group 154 may include a plurality of lens assemblies having different optical focal lengths, wherein the closer the wavelength conversion device 130 is, the closer the lens focal length is. Small enough to converge the light incident on the wavelength conversion device 130 to collimate the light emitted from the wavelength conversion device 130.

The collecting lens group 154 does not coincide with the optical axis of the main light source 110, and the excitation light is incident on the collecting lens group 154 at a position deviating from the optical axis of the collecting lens group 154, and is irradiated to the wavelength at a certain oblique angle after being concentrated by the collecting lens group 154. The device 130 is switched and a smaller spot is formed on the wavelength conversion device 130. The non-conversion region B of the wavelength conversion device 130 receives the excitation light, and scatters the excitation light and reflects it in the form of Gaussian light, that is, the incident light of the non-conversion region B and the optical path of the outgoing light are optically symmetric along the collecting lens group 154. . When the excitation light is irradiated to the conversion region, the conversion region emits a laser light in the form of a Lambertian light, and is incident to the collecting lens group 154 at a large divergence angle. It will be appreciated that in one embodiment, the non-conversion zone B scatters the excitation light out of other light.

The relay lens 155 adjusts the divergence angle of the incident light and directs it to the light homogenizing device 156. In this embodiment, the light-homogenizing device 156 is a light-diffusing rod. It can be understood that in other embodiments, the light-homogenizing device 156 may include other components such as a fly-eye lens, and is not limited thereto.

In this embodiment, the height dimension of the wavelength conversion device 130 can be made very thin, that is, the size of the wavelength conversion device 130 in the direction parallel to the rotation axis can be made thin, and the excitation light irradiated on the wavelength conversion device 130 The spot size is equivalent to facilitate the thinning of the light source system 100; in addition, the cross section of the wavelength conversion device 130 (the cross section perpendicular to the rotation axis) can be made large, and the wavelength conversion device 130 occupied by the excitation light spot 130 The angle on the side wall is small, thereby reducing the efficiency loss caused by the spoke area S; and at the same time, since the contact area with air is large, the heat dissipation performance of the wavelength conversion device 130 is also improved, thereby improving the conversion efficiency of the wavelength conversion device 130.

In one embodiment, the light source system 100 includes a primary light source 110 and a wavelength conversion device 130, and the guiding device 150 is omitted. The excitation light emitted from the light source system 100 is directly irradiated to the outer surface of the side wall of the substrate 131 of the wavelength conversion device 130. As in the first embodiment, the height of the side wall of the substrate 131 can be made thin, and the cross section is made large, thereby realizing the light source. The system 100 is thinned and the conversion efficiency of the wavelength conversion device 130 is improved.

Please refer to FIG. 4 , which is a schematic structural diagram of a light source system 300 according to a second embodiment of the present invention. The main difference between the light source system 300 and the light source system 100 is that the light source system 300 further includes a supplemental light source 370 for emitting supplemental light. Accordingly, the wavelength conversion device 330 omits the filter layer structure, and the first beam splitting in the guiding device 350 The filter 352a is provided with a coating area corresponding to the supplementary light, and the first spectral filter 352a is further configured to transmit the supplementary light, and the supplementary light passes through the first reflective element 352b and the coating area and is subjected to laser irradiation. Heguang.

Specifically, the supplemental light source 370 includes an illuminant 371, a light homogenizing device 372, a converging lens 373, a scattering element 374, and a relay lens 375.

In this embodiment, the illuminant 371 is a red laser, and emits red laser light as red supplemental light to correct the red laser light to improve the purity of the red light source light emitted by the light source system 300. Accordingly, the wavelength conversion device 330 omits the filtering. Layer structure.

The complementary light emitted from the illuminant 371 is de-cohered by the scattering element 374, and the relay lens 375 is concentrated, passes through the first reflective element 352a, and is focused near the first spectral filter 352b. The first reflective element 352a may be a red-transparent blue spectroscopic filter or a region-coated spectroscopic filter; the first spectroscopic light-combining element 352b is provided with a full-transparent film in a coating area corresponding to the spot of the complementary light. Or cover the red and blue anti-green dichroic film. Since the spot of the supplemental light is small, the coated area can be made small to reduce the loss of laser light.

As in the first embodiment, the height dimension of the wavelength conversion device 330 can be made very thin, that is, the size of the wavelength conversion device 330 in the direction parallel to the optical axis can be made thin, and is irradiated on the wavelength conversion device 330. The size of the excitation light spot is equivalent, which is advantageous for the light source system 300 to be thinned. In addition, the cross section of the wavelength conversion device 330 (a cross section perpendicular to its optical axis) can be made large, and the wavelength conversion device occupied by the excitation light spot can be made. The angle on the side wall of the 330 is small, thereby reducing the efficiency loss caused by the spoke area S; and at the same time, the heat dissipation performance of the wavelength conversion device 330 is also improved due to the large contact area with air, thereby improving the conversion efficiency of the wavelength conversion device 330.

Please refer to FIG. 5 to FIG. 6. FIG. 5 is a schematic diagram of another embodiment of the second embodiment shown in FIG. 4. FIG. 6 is a partial structural diagram of the non-conversion area B of the wavelength conversion device 430 shown in FIG. . In the present embodiment, the main difference between the light source system 400 and the light source system 300 is that the non-conversion zone B of the wavelength conversion device 430 is different from the non-conversion zone B structure of the wavelength conversion device 330, and accordingly, the collection lens group in the guiding device 450 The optical axis of 454 coincides with the optical axis of the primary light source 410, saving the internal space of the light source system 400.

As shown in FIG. 6, the surface non-conversion region B of the substrate 431 of the wavelength conversion device 430 is provided with a reflection slope such that the incident excitation light of the non-conversion region B is separated from the optical path from which the excitation light is emitted, thereby collecting the lens group 454 and the main light source 410. The optical axis does not need to be offset. It can be understood that the surface non-conversion area B of the substrate 431 may be provided with a reflection slope, or the surface of the non-conversion area B is provided with a plurality of reflection slopes, and the plurality of reflection slopes are connected in a zigzag manner to the non-conversion. Area surface. In a possible implementation manner, the reflective bevel may be a microstructure disposed on a surface of the non-conversion zone B.

As in the first embodiment, the height dimension of the wavelength conversion device 430 can be made very thin, that is, the size of the wavelength conversion device 430 in the direction parallel to the optical axis can be made thin and at least irradiated onto the wavelength conversion device 430. The size of the excitation light spot is equivalent to facilitate the thinning of the light source system 400; in addition, the cross section of the wavelength conversion device 430 (the cross section perpendicular to its optical axis) can be made large, and the wavelength conversion occupied by the excitation light spot The angle on the side wall of the device 430 is small, thereby reducing the efficiency loss caused by the spoke area S; and at the same time, the heat dissipation performance of the wavelength conversion device 430 is also improved due to the large contact area with air, thereby improving the conversion efficiency of the wavelength conversion device 430.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims

A light source system, comprising:

a main light source for emitting laser light as excitation light;

a wavelength conversion device comprising a substrate, the substrate comprising a cylindrical sidewall, a thermal conversion material disposed on an outer surface of the sidewall, the wavelength conversion material for receiving the excitation light and The excitation light is wavelength converted and emits a laser of at least one color having a height dimension at least comparable to the size of the excitation spot incident thereon.
The light source system according to claim 1, wherein a conversion area and a non-conversion area are disposed on an outer surface of the side wall of the substrate, and the conversion area includes at least one section, and different sections are respectively provided for generating The different wavelengths are subjected to a wavelength conversion material of the laser, and the non-conversion region is provided with a scattering material for scattering the incident light.
The light source system according to claim 2, wherein a connection region between the conversion region and the non-conversion region, and a connection region between the conversion regions is a spoke region, the wavelength conversion The device is further provided with a driving unit and a fixing member on the inner side of the substrate, and two ends of the fixing member are respectively connected to the driving unit and an inner surface of the substrate sidewall corresponding to the spoke region, and the driving unit is used for Driving the substrate to periodically move.
The light source system according to claim 1, wherein said light source system further comprises a first reflective element, a first spectral filter, a relay lens and a light homogenizing device, said second spectral filter being used for Directing the excitation light to the wavelength conversion device, and guiding the received laser light to the light homogenizing device, the first reflective element for reflecting the excitation light emitted by the wavelength conversion device to the uniformity An optical device that emits light after the incident laser light and the excitation light are homogenized.
The light source system according to claim 4, wherein a collecting lens group is further disposed between the first spectral filter and the wavelength conversion device, and the collecting lens group is configured to be incident on the wavelength The light of the conversion device converges and collimates the light emitted by the wavelength conversion device.
The light source system according to claim 5, wherein the collecting lens group does not coincide with an optical axis of the main light source, and the excitation light is irradiated to the ground at a certain oblique angle after being concentrated by the collecting lens group. The wavelength conversion device includes a filter layer covering a surface of the substrate, and both the incident light and the outgoing light of the wavelength conversion device are color-corrected by the filter layer, and the incident of the non-conversion region The light path and the outgoing light path are symmetrical along the optical axis of the collecting lens group.
The light source system according to claim 5, wherein the surface of the non-conversion region is provided with a reflection slope such that the incident excitation light of the non-conversion region is separated from the optical path of the exit excitation light, the collection lens group and the The optical axes of the main light source coincide.
The light source system according to claim 7, wherein the surface of the non-conversion zone is provided with a plurality of reflective bevels, and the plurality of reflective bevels are connected in a zigzag manner on the surface of the non-conversion zone.
A light source system according to claim 5, wherein said light source system further comprises a supplemental light source, said supplemental light emitted by said supplemental light source being used for color correction of said laser light emitted from said wavelength conversion means, said supplement Light converges in the vicinity of the first spectral filter, the first spectral filter is provided with a coating area corresponding to the spot of the supplementary light, and the supplementary light passes through the coating area to be combined with the laser Light.
A projection apparatus characterized by using the light source system according to any one of claims 1-9.