Light source structure, color wheel and projection device

Abstract

The application provides a light source structure, which comprises a laser light source, a color wheel, a first guide component and a second guide component, and the laser light source is used for emitting excitation light. The color wheel comprises an inner ring and an outer ring which are concentrically arranged, the inner ring comprises a light conversion area which generates stimulated light under the excitation of the excitation light, and the outer ring comprises a first guide area and a second guide area, and the first guide area and the second guide area are both used for guiding the excitation light emitted by the laser light source. The first guide component is used for guiding the excitation light emitted from the first guide area to exit along an exit light path. The second guide component is used for guiding the excitation light emitted from the second guide area to the light conversion area, and is also used for guiding the stimulated light emitted from the light conversion area to the exit light path. The light source structure provided by the application has less optical elements through which the excitation light passes, reduces energy loss, and improves the optical utilization rate of the light source structure. The application further provides a color wheel and a projection device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical technology, in particular to a light source structure, a color wheel and a projection device. BACKGROUND

[0002] In recent years, with the rapid development of the market and the progress of components and devices, the design of laser projection light machines is also evolving and upgrading. The cost of excitation light is relatively lower than that of red and green lasers, so in existing laser fluorescent light sources, excitation light is often used as a laser light source. However, in the light path of the existing laser light source, the excitation light passes through many optical elements, the energy loss is large, and the optical utilization rate is not high. SUMMARY

[0003] The purpose of the present application is to provide a light source structure, a color wheel and a projection device to solve the problem of low optical utilization rate of excitation light. The present application achieves the above-mentioned purpose through the following technical solutions.

[0004] In a first aspect, the present application provides a light source structure, comprising a laser light source, a color wheel, a first guide assembly and a second guide assembly, the laser light source being configured to emit excitation light. The color wheel comprises a concentric inner ring and an outer ring, the inner ring comprising a light conversion region, the light conversion region generating stimulated light under the excitation of the excitation light, the outer ring comprising a first guide region and a second guide region, both the first guide region and the second guide region being configured to guide the excitation light emitted by the laser light source. The first guide assembly is configured to guide the excitation light emitted from the first guide region. The second guide assembly is configured to guide the excitation light emitted from the second guide region to the light conversion region, and to guide the stimulated light emitted from the light conversion region.

[0005] In an embodiment, the central angle of the second guide region corresponds to the central angle of the light conversion region.

[0006] In an embodiment, the light conversion region comprises a first fluorescent region and a second fluorescent region, the first fluorescent region being configured to be excited by the excitation light to generate first fluorescent light, the second fluorescent region being configured to be excited by the excitation light to generate second fluorescent light, and the light source structure further comprising a light combining device, the first fluorescent light, the second fluorescent light and the excitation light emitted from the first guide region being combined by the light combining device and then emitted along an emission light path.

[0007] In an embodiment, the light source structure further comprises a first reflector located between the laser light source and the color wheel, configured to reflect the excitation light emitted by the laser light source to the color wheel, and to make the angle of incidence of the excitation light incident on the outer ring of the color wheel an acute angle.

[0008] In an embodiment, the light source structure further comprises a second reflector, the second reflector being inclined at an acute angle with respect to the plane of the color wheel, and the second reflector being configured to reflect the excitation light incident on the first guide region to the first guide assembly.

[0009] In an embodiment, the first guiding assembly comprises a third reflector for reflecting the excitation light out of the first guiding region, the second reflector and the third reflector are disposed on opposite sides of the color wheel, the excitation light incident on the first guiding region is guided to the second reflector, the excitation light is reflected by the second reflector to enter the first guiding region and is out of the third reflector, and the third reflector reflects the excitation light to the light exit path.

[0010] In an embodiment, the first guiding region is disposed obliquely relative to the second guiding region, and the first guiding region is configured to reflect the incident excitation light to the first guiding assembly.

[0011] In an embodiment, the second guiding assembly comprises a fourth reflector and a first dichroic sheet, the excitation light incident on the second guiding region and guided out of the second guiding region by the second guiding region is reflected by the fourth reflector to the first dichroic sheet, the first dichroic sheet is configured to guide the excitation light from the fourth reflector to the light conversion region, and is configured to guide the stimulated light generated by the light conversion region.

[0012] In an embodiment, the light source structure further comprises a light combining device and a light homogenizing device, the stimulated light out of the second guiding assembly is guided by the light combining device to the light homogenizing device, and the excitation light out of the first guiding assembly is guided by the light combining device to the light homogenizing device.

[0013] In an embodiment, the light source structure further comprises a supplemental light source and a second dichroic sheet, the supplemental light source is configured to emit supplemental light, and the second dichroic sheet is disposed between the color wheel and the first guiding assembly and is configured to guide the excitation light out of the first guiding region and the supplemental light emitted by the supplemental light source to the first guiding assembly.

[0014] In a second aspect, the present application also provides a color wheel, comprising a concentrically disposed inner ring and an outer ring, the outer ring comprises a first guiding region and a second guiding region, the first guiding region and the second guiding region are respectively configured to guide the excitation light incident thereon and make the excitation light out of different directions, and the inner ring comprises a light conversion region, the light conversion region is configured to generate stimulated light under excitation of the excitation light.

[0015] In an embodiment, the first guiding region is disposed obliquely relative to the second guiding region, and the first guiding region is configured to reflect the excitation light.

[0016] In a third aspect, the present application also provides a projection device, the projection device comprises the light source structure of the first aspect.

[0017] Compared with the prior art, the light source structure provided by the application guides the excitation light to the first guide assembly and the second guide assembly respectively by setting the first guide area and the second guide area on the color wheel, and the excitation light emitted from the first guide area passes through fewer optical elements after being guided by the first guide assembly, thereby reducing energy loss and improving the optical utilization rate of the light source structure.

[0018] These and other aspects of the application will become more fully understood from the following description of the embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0020] Figure 1 is a structural schematic diagram of a light source structure provided by a first embodiment of the application.

[0021] Figure 2 is a structural schematic diagram of a color wheel provided by the embodiment of the application.

[0022] Figure 3 is a structural schematic diagram of a light source structure provided by a second embodiment of the application.

[0023] Figure 4 is a structural schematic diagram of a light source structure provided by a third embodiment of the application.

[0024] Figure 5 is a structural schematic diagram of a light source structure provided by a fourth embodiment of the application.

[0025] Figure 6 is a structural schematic diagram of a color wheel provided by the fourth embodiment of the application.

[0026] Figure 7 is Figure 6 is a sectional view along the A-A direction.

[0027] Figure 8 is a structural schematic diagram of a light source structure provided by a fifth embodiment of the application.

[0028] Figure 9 is a structural schematic diagram of a light source structure provided by a sixth embodiment of the application.

[0029] Figure 10 is a structural schematic diagram of a projection device provided by a seventh embodiment of the application. DETAILED DESCRIPTION

[0030] For the purpose of clarity, the present embodiments will be described with reference to the accompanying drawings in which preferred embodiments of the application are shown. The application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0032] First Embodiment

[0033] Referring to Figure 1 and Figure 2 The present application provides a light source structure 1, comprising a laser light source 11, a color wheel 10, a first guiding assembly 13 and a second guiding assembly 14, the laser light source 11 is used for emitting excitation light. The color wheel 10 comprises an inner ring 100 and an outer ring 110 arranged concentrically, the inner ring 100 comprises a light conversion region 101, the light conversion region 101 is used for generating stimulated light under the excitation of the excitation light, the outer ring 110 comprises a first guiding region 112 and a second guiding region 114, the first guiding region 112 and the second guiding region 114 are respectively used for guiding the excitation light incident thereon and making the excitation light exit in different directions. The first guiding assembly 13 is used for guiding the excitation light exiting from the first guiding region 112. The second guiding assembly 14 is used for guiding the excitation light exiting from the second guiding region 114 to the light conversion region 101, and is also used for guiding the stimulated light exiting from the light conversion region 101.

[0034] Specifically, the laser light source 11 can comprise a laser, which can be a single laser, a laser chip or a laser diode, etc., or other laser emitting devices. It can be understood that the laser light source 11 can also comprise two, three or more lasers, which can be arranged in an array to increase the light intensity of the laser, and the plurality of lasers can also be arranged non-uniformly.

[0035] In the present embodiment, the laser light source 11 can be a blue light source, and the corresponding excitation light is blue light. Since the cost of the blue light source is relatively low, the use of the blue light source can reduce the cost. The excitation light, as a primary color light, also serves as an excitation light, which excites red light and green light, two other primary color lights, so as to mix and emit white light.

[0036] In other embodiments, the laser light source 11 can also be a red light source, a green light source or a violet light source, etc.

[0037] In the embodiment, the color wheel 10 is a circular ring. In other embodiments, the color wheel 10 can also be a circle, a rectangle, an ellipse or a trapezoid.

[0038] The light source structure 1 further comprises a color wheel motor 15, the color wheel 10 is driven by the color wheel motor 15. The color wheel motor 15 drives the color wheel 10 to rotate around the rotation axis of the color wheel motor 15, which on one hand avoids the laser acting on the same position of the color wheel 10 for a long time, thereby reducing the service life of the color wheel 10. On the other hand, the rotation of the color wheel 10 can also alternately generate different colors of fluorescent light.

[0039] The light source structure 1 further comprises a light combining device 12, which is used for combining the excitation light emitted by the first guide assembly 13 and the laser.

[0040] The light conversion area 101 comprises a first fluorescent area 1011 and a second fluorescent area 1013, the first fluorescent area 1011 is used for being excited by the excitation light to emit first fluorescent light, the second fluorescent area 1013 is used for being excited by the excitation light to emit second fluorescent light, and the first fluorescent light, the second fluorescent light and the excitation light emitted from the first guide area 112 are combined by the light combining device 12 and then emitted along the emission light path.

[0041] In the embodiment, the first fluorescent area 1011 is provided with red fluorescent powder, which can be sintered with the adhesive in the first fluorescent area 1011, or directly coated on the reflective substrate, and the first fluorescent light is red. The second fluorescent area 1013 is provided with green fluorescent powder, which can also be sintered with the adhesive in the second fluorescent area 1013, or directly coated on the reflective substrate, and the second fluorescent light is green.

[0042] In other embodiments, the first fluorescent light can also be green, and the second fluorescent light can also be red.

[0043] In other embodiments, when the light conversion area 101 only comprises one area, the area can be provided with yellow fluorescent powder, and the emitted yellow fluorescent light can be combined with a filter to obtain red fluorescent light and green fluorescent light.

[0044] In the embodiment, the inner ring 100 further comprises an invalid area 103, which is arranged between the first fluorescent area 1011 and the second fluorescent area 1013. The invalid area 103 is arranged opposite to the first guide area 112, and the central angle corresponding to the invalid area 103 is equal to the central angle corresponding to the first guide area 112. The invalid area 103 can not be provided with fluorescent powder, and it can be transparent glass with transmission function, or can be provided with a balancing device to keep the color wheel 10 balanced during rotation.

[0045] In the embodiment, the first guide area 112 is a transmission area, which can be used for transmitting the excitation light. The second guide area 114 is a reflection area, which can be used for reflecting the excitation light to change the propagation direction of the excitation light.

[0046] In an implementation, the first guide area 112 can also be designed as a through hole. The through hole can be a hollow design in a partial area of the first guide area 112, or a hollow design in the entire area of the first guide area 112. Correspondingly, the invalid area 103 opposite to the first guide area 112 is also a through hole, which can meet the requirement that the color wheel 10 can keep balance during rotation.

[0047] In the embodiment, the central angle of the second guide area 114 is equal to the central angle of the light conversion area 101, that is, the central angle of the second guide area 114 is equal to the sum of the central angles of the first fluorescent area 1011 and the second fluorescent area 1013. Therefore, the excitation light reflected by the second guide area 114 can be guided by the second guide assembly 14 and incident on the first fluorescent area 1011 and the second fluorescent area 1013, but not on the invalid area 103. The excitation light transmitted by the first guide area 112 will not enter the first fluorescent area 1011 and the second fluorescent area 1013, so that the excitation light will not affect the color of the first fluorescent light and the second fluorescent light.

[0048] The light combination device 12 can be used for combining the excitation light and the stimulated light. The first fluorescent light, the second fluorescent light and the excitation light transmitted through the first guide area 112 can be emitted in the same direction after passing through the light combination device 12. In the embodiment, the light combination device 12 can be a blue-transmissive and yellow-reflective dichroic sheet, which can reflect the red first fluorescent light and the green second fluorescent light and transmit the excitation light. Therefore, the blue excitation light mixed in the first fluorescent light and the second fluorescent light and not absorbed will be transmitted at the light combination device 12, so as not to affect the color of the red and green primary color light.

[0049] The light source structure 1 further includes a first reflector 16 and a first positive lens 17. The first reflector 16 is located between the laser light source 11 and the color wheel 10, and is used for reflecting the excitation light emitted by the laser light source 11 to the color wheel 10, so that the incident angle of the excitation light incident on the outer ring 110 of the color wheel 10 is an acute angle. The first positive lens 17 is located between the laser light source 11 and the first reflector 16, and is used for converging the excitation light emitted by the laser light source 11 to the first reflector 16, that is, the first positive lens 17 can be used for converging the excitation light emitted by the laser light source 11 and making the converged excitation light incident on the first reflector 16.

[0050] The light source structure 1 further comprises a second reflector 18 corresponding to the outer ring 110, the second reflector 18 is inclined at an acute angle relative to the plane where the color wheel 10 is located, and the second reflector 18 is used to reflect the excitation light incident to the first guide component 13 to the first guide component 13. The second reflector 18 is arranged to be inclined relative to the incident plane of the color wheel 10, which can separate the excitation light reflected from the reflector 18 from the excitation light reflected from the second guide component 14 in the path, facilitating the separation of the light paths of the excitation light emitted from the first guide component 112 and the excitation light emitted from the second guide component 114, so that different optical devices can be used for guiding along different paths. The light paths of the excitation light emitted from the first guide component 112 and the excitation light emitted from the second guide component 114 are separated, which is beneficial to efficiently utilize the excitation light as the primary color light (i.e. the excitation light emitted from the first guide component 112), avoids the excitation light as the primary color light from passing through too many optical elements to cause light loss, that is, the excitation light passes through fewer optical elements, thereby reducing energy loss and improving the optical utilization rate of the light source structure 1. When the color wheel 10 is turned to the position where the second reflector 18 corresponds to the second guide component 114, the excitation light is reflected by the second guide component 114 and does not incident to the second reflector 18; when the color wheel 10 is turned to the position where the second reflector 18 corresponds to the first guide component 112, the excitation light is transmitted by the first guide component 112, the excitation light is incident to the second reflector 18, and the excitation light is emitted from the color wheel 10 again after being reflected by the second reflector 18 and passing through the first guide component 112. The excitation light emitted by the laser light source 11 is incident to the color wheel 10 after passing through the first positive lens 17 and the first reflector 16 in turn, and the excitation light passing through the first guide component 112 is emitted from the first guide component 112 again after being reflected by the second reflector 18.

[0051] The light source structure 1 further comprises a light homogenizing device 19 adjacent to the light combining device 12, the stimulated light emitted from the second guide component 14 is guided to the light homogenizing device 19 by the light combining device 12, and the excitation light emitted from the first guide component 13 is guided to the light homogenizing device 19 by the light combining device 12. In this embodiment, the light homogenizing device 19 can be a square rod. In other embodiments, the light homogenizing device 19 can also be a scattering sheet, a single compound eye, a double compound eye, or a compound eye assembly, and the specific structure can be selected according to the actual situation to meet the light homogenizing function. The light homogenizing device 19 is adjacent to the light combining device 12, specifically, the first fluorescence and the second fluorescence are reflected to the light homogenizing device 19 by the light combining device 12, and the excitation light passing through the first guide component 112 is incident to the light homogenizing device 19 after passing through the light combining device 12.

[0052] The first guiding assembly 13 comprises a third mirror 132, which is arranged on the opposite side of the color wheel 10 from the second mirror 18. The excitation light incident to the first guiding area 112 is guided to the second mirror 18, and after being reflected by the second mirror 18, the excitation light enters the first guiding area 112 and is emitted to the third mirror 132. The third mirror 132 is configured to reflect the excitation light emitted from the first guiding area 112 and reflect the excitation light to an emission light path.

[0053] The first guiding assembly 13 further comprises a first relay lens 134. The first relay lens 134 is arranged between the third mirror 132 and the light combining device 12. The excitation light passing through the first guiding area 112 is concentrated to one side of the light combining device 12 by the first relay lens 134 after being reflected by the third mirror 132. The first relay lens 134 can reduce the energy loss of the excitation light during transmission. Since the excitation light emitted from the first guiding area 112 only passes through the third mirror 132 and the first relay lens 134, the excitation light passes through fewer optical elements, and thus the loss of the excitation light is less, and the optical utilization rate is higher.

[0054] The second guiding assembly 14 comprises a fourth mirror 141 and a first dichroic plate 143. The excitation light reflected by the second guiding area 114 is reflected by the fourth mirror 141 to the first dichroic plate 143. The first dichroic plate 143 is configured to guide the excitation light from the fourth mirror 141 to the light conversion area 101, and to guide the stimulated light generated by the excitation of the light conversion area 101 to the light combining device 12. In this embodiment, the first dichroic plate 143 can be a yellow-passing blue-reflection dichroic plate, which reflects the excitation light to a collection lens group 147, and transmits the first fluorescent light and the second fluorescent light generated by the excitation.

[0055] The second guiding assembly 14 further comprises a second positive lens 145, a light homogenizing element 146 and a collecting lens set 147. The second positive lens 145 is located between the fourth mirror 141 and the light homogenizing element 146, and is used to converge the excitation light reflected by the fourth mirror 141 to the light homogenizing element 146. The light homogenizing element 146 is located between the second positive lens 145 and the first dichroic plate 143, and is used to homogenize the excitation light emitted by the second positive lens 145 and direct the homogenized excitation light to the first dichroic plate 143. The collecting lens set 147 comprises at least two convex lenses. In the embodiment, the collecting lens set 147 comprises two plano-convex lenses. In other embodiments, the collecting lens set 147 can also be a concave-convex lens or a biconvex lens, as long as it can converge the excitation light. The collecting lens set 147 is located between the first dichroic plate 143 and the color wheel 10, and is used to converge the excitation light reflected by the first dichroic plate 143 to the first fluorescent region 1011 or the second fluorescent region 1013 of the inner ring 100, and also used to converge the first fluorescent light excited by the first fluorescent region 1011 and the second fluorescent light excited by the second fluorescent region 1013 to the first dichroic plate 143. The collecting lens set 147 can make the excitation light incident to the first fluorescent region 1011 and the second fluorescent region 1013 more concentrated, so as to improve the efficiency of exciting the first fluorescent light and the second fluorescent light. The excitation light reflected by the second guiding region 114 is guided by the fourth mirror 141, the second positive lens 145, the light homogenizing element 146, the first dichroic plate 143 and the collecting lens set 147 in sequence, and then is incident to the first fluorescent region 1011 and the second fluorescent region 1013.

[0056] In the embodiment, the second guiding assembly 14 further comprises a second relay lens 149. The second relay lens 149 is located between the first dichroic plate 143 and the light combining device 12. The first fluorescent light and the second fluorescent light are converged by the second relay lens 149 to the other side of the light combining device 12. The second relay lens 149 can reduce the energy loss of the first fluorescent light and the second fluorescent light in the transmission process. The excited first fluorescent light and second fluorescent light are guided by the collecting lens set 147, the transmission of the first dichroic plate 143, the second relay lens 149 and the light combining device 12 in sequence, and then are incident to the light homogenizing device 19.

[0057] In the embodiment, the excitation light incident to the first guiding region 112 is transmitted through the first guiding region 112 and then is incident to the second mirror 18. After being reflected by the second mirror 18, the excitation light is incident to the first guiding region 112 again, is transmitted through the first guiding region 112 and then is incident to the third mirror 132. After being reflected by the third mirror 132 and being converged by the first relay lens 134, the excitation light is incident to the light combining device 12, passes through the light combining device 12 and finally is incident to the light homogenizing device 19.

[0058] The excitation light incident to the second guide area 114 is reflected by the second guide area 114, and then is incident to the first fluorescent area 1011 and the second fluorescent area 1013 after being reflected by the fourth reflecting mirror 141, the second positive lens 145 and the light homogenizing element 146, the reflection of the first dichroic plate 143 and the convergence of the collection lens group 147, and the first fluorescent light and the second fluorescent light are excited in the first fluorescent area 1011 and the second fluorescent area 1013 respectively. The first fluorescent light and the second fluorescent light are finally incident to the light homogenizing device 19 after being converged by the collection lens group 147, being transmitted by the first dichroic plate 143, being converged by the second relay lens 149 and being reflected by the light combining device 12. That is, the light path of the excitation light as the illumination light is shorter than the light path of the excitation light as the excitation light for generating the fluorescent light, and the excitation light passes through fewer components, so that the energy loss of the excitation light as the illumination light is reduced, and the optical utilization of the light source structure 1 is improved.

[0059] In summary, the light source structure 1 provided by the present application divides the excitation light as the illumination light and the excitation light as the excitation light for generating the fluorescent light into different light paths by the first guide area 112 and the second guide area 114 provided on the color wheel 10. On the one hand, the excitation light as the illumination light does not pass through the light path for generating the fluorescent light, and the light path is shorter. On the other hand, the excitation light as the illumination light passes through fewer optical components after being emitted from the first guide area 112, so that the energy loss of the excitation light as the illumination light is reduced, and the optical utilization of the light source structure 1 is improved.

[0060] Second embodiment

[0061] Please refer to Figure 2 and Figure 3 Different from the first embodiment, the light combining device 22 of the light source structure 2 provided by the present application can be a yellow-transmitting and blue-reflecting dichroic plate, and the first fluorescent light and the second fluorescent light can be incident to the light homogenizing device 29 through the light combining device 22. The light homogenizing device 29 can be an ommatidium, a scattering plate or other light homogenizing devices, and the excitation light passing through the first guide area 112 is reflected to the light homogenizing device 29 by the light combining device 22. That is, the first fluorescent light and the second fluorescent light are transmitted, and the excitation light is reflected. The excitation light not absorbed in the first fluorescent light and the second fluorescent light is also transmitted at the light combining device 22, and does not enter the light homogenizing device 29.

[0062] In the embodiment, since the light combining device 22 is a yellow-transmitting and blue-reflecting dichroic plate, the first fluorescent light and the second fluorescent light can be incident to the light homogenizing device 29 through the light combining device 22, so that the transmission distance of the first fluorescent light and the second fluorescent light in the vertical direction is shortened, and the volume of the light source structure 2 is reduced.

[0063] Third embodiment

[0064] Please refer to Figure 2 and Figure 4Different from the first embodiment, the light source structure 3 provided by the present embodiment further comprises a supplementary light source 33, a speckle elimination device 34, a second dichroic plate 35 and a third relay lens 36. The supplementary light source 33 is adjacent to the laser light source 11 and is used to emit supplementary light, thereby improving the light brightness, primary color purity of the light source structure 3 and expanding the color gamut space of the emitted light rays. The supplementary light source 33 can also be a laser or a laser chip, etc. The third relay lens 36 is located between the color wheel 10 and the second dichroic plate 35 and is used to converge and emit the excitation light from the second mirror 38 to the second dichroic plate 35. The third relay lens 36 can reduce the energy loss of the excitation light emitted by the first guide area 112, so as to maintain the light intensity of the excitation light. The second dichroic plate 35 is located between the color wheel 10 and the first guide assembly 37 and is used to guide the excitation light emitted by the first guide area 112 and the supplementary light emitted by the supplementary light source 33 to the first guide assembly 37. Specifically, the second dichroic plate 35 is located between the third relay lens 36 and the speckle elimination device 34 and is used to make the excitation light emitted by the third relay lens 36 pass through and be incident on the speckle elimination device 34, and is also used to reflect the supplementary light emitted by the supplementary light source 33 to the speckle elimination device 34. The speckle elimination device 34 is located between the second dichroic plate 35 and the third mirror 332, and the excitation light and the supplementary light passing through the speckle elimination device 34 are guided to the light homogenizing device 39 by the third mirror 332. By arranging the speckle elimination device 34, the excitation light and the supplementary light can be scattered and diffused, thereby eliminating the coherence of the laser.

[0065] In the present embodiment, the supplementary light source 33 is a red light source or a green light source and emits red supplementary light or green supplementary light. In other embodiments, the supplementary light source 33 is not limited to a red light source or a green light source, but can also be a red-green light source, i.e., emits red laser and green laser, or a violet light source, etc. The color of the supplementary light emitted by the supplementary light source 33 can be set according to different requirements for the excitation light, for example, when the excitation light is insufficient in a certain color, the supplementary light is the light of that color. In the present embodiment, the mixed light is guided to the light homogenizing device 39 by the speckle elimination device 34, the third mirror 332 and the first relay lens 334 in turn. That is, the supplementary light is mixed with the excitation light first and then passes through the speckle elimination device 34 together and is incident on the third mirror 332.

[0066] In the present embodiment, the supplementary light source 33 is a red light source or a green light source and emits red supplementary light or green supplementary light. In other embodiments, the supplementary light source 33 is not limited to a red light source or a green light source, but can also be a red-green light source, i.e., emits red laser and green laser, or a violet light source, etc. The color of the supplementary light emitted by the supplementary light source 33 can be set according to different requirements for the excitation light, for example, when the excitation light is insufficient in a certain color, the supplementary light is the light of that color. In the present embodiment, the mixed light is guided to the light homogenizing device 39 by the speckle elimination device 34, the third mirror 332 and the first relay lens 334 in turn. That is, the supplementary light is mixed with the excitation light first and then passes through the speckle elimination device 34 together and is incident on the third mirror 332.

[0067] Third Embodiment

[0068] Please refer to Figure 5 , Figure 6 and Figure 7Different from the third embodiment, the first guide area 412 of the light source structure 4 is arranged obliquely relative to the second guide area 414 in the embodiment, and the first guide area 412 is used for reflecting the incident excitation light to the first guide assembly 43. The second reflector 48 is arranged in the first guide area 412. Specifically, a chamfer can be formed in the first guide area 412, and the angle of the chamfer can be designed according to the actual light path and the space size. The second reflector 48 can be a reflecting surface or can be formed on the inclined surface formed by the chamfer of the first guide area 412 by coating or the like. It can be understood that the chamfer of the first guide area 412 can increase the weight of the first guide area 412 at the same time, so that the color wheel 40 can be balanced during rotation.

[0069] In the embodiment, the first guide area 412 of the color wheel is arranged as an inclined surface, so that the excitation light is directly reflected out of the inclined surface, and the reflector arranged on the back of the color wheel is omitted, and the light loss caused by the transmission of the excitation light through the color wheel can also be avoided.

[0070] Fifth Embodiment

[0071] Please refer to Figure 2 and Figure 8 Different from the first embodiment, the second reflector 58 and the second dichroic sheet 55 of the light source structure 5 are arranged on opposite sides of the color wheel 10 in the embodiment, the second reflector 58 is opposite to the outer ring 110, the excitation light incident to the first guide area 112 is guided to the second reflector 58, and after being reflected by the second reflector 58, the excitation light is incident to the second dichroic sheet 55 through the first guide area 112 and is guided to the light combining device 52 by the second dichroic sheet 55. The second dichroic sheet 55 corresponds to the light combining device 52 and is used for guiding the excitation light out of the first guide area 112 to the light combining device 52 through the first guide assembly 51. Specifically, the second dichroic sheet 55 is located between the speckle eliminating device 54 and the light homogenizing device 59, is used for passing the supplemental light out of the speckle eliminating device 54, and is used for reflecting the excitation light from the second reflector 58 to the light combining device 52. The speckle eliminating device 54 is located between the supplemental light source 53 and the second dichroic sheet 55, and is used for eliminating the speckle of the supplemental light and emitting the speckle-eliminated supplemental light to the second dichroic sheet 55. The supplemental light passes through the speckle eliminating device 54 and is guided to the light combining device 52 by the second dichroic sheet 55.

[0072] In the embodiment, the supplemental light is added, so that the supplemental light can be used to adjust the mixed primary color light to a better level at a higher excitation light power density level, and the higher brightness and wider color gamut of the light engine can be achieved.

[0073] Sixth Embodiment

[0074] Please refer to Figure 2 and Figure 9Different from the first embodiment, the first guide area 112 of the light source structure 6 in the embodiment is a reflection area, and the second guide area 114 is a transmission area. The second reflector 68 and the color wheel motor 15 are located on the same side of the color wheel 10, and the first dichroic sheet 643 is a blue-reflection and yellow-transmission dichroic sheet, that is, the excitation light emitted by the laser light source 61 is reflected by the first guide area 112 and then guided to the light combination device 62 by the first guide assembly 63; the excitation light emitted by the laser light source 61 is transmitted through the second guide area 114 and then reflected by the second reflector 68, guided by the second guide assembly 14, and reflected by the first dichroic sheet 643, and then incident on the light conversion area 101, and the stimulated light generated by the light conversion area 101 is transmitted through the first dichroic sheet 643 and then incident on the light combination device 62. In the embodiment, the excitation light passes through fewer elements, and the energy loss can be reduced, and the optical utilization rate of the light source structure 6 can be improved.

[0075] In the embodiment, the first guide area 112 is a reflection area, and the second guide area 114 is a transmission area. Since the area of the first guide area 112 is smaller than the area of the second guide area 114, the light quantity of the excitation light for generating fluorescence is greater than the light quantity of the excitation light for illumination, and the light path of the excitation light for generating fluorescence is longer, so the energy loss is greater. Increasing the light quantity of the excitation light for generating fluorescence can compensate for the loss of fluorescence energy.

[0076] Seventh embodiment

[0077] Please refer to Figure 10 The application also provides a projection device 100, which comprises the light source structure 1. In the embodiment, the projection device 100 further comprises an optical engine 8 and a lens 9, and the light emitted by the light source structure 1 is transmitted through the lens 9 after being imaged by the optical engine 8.

[0078] The above-described embodiments only express several embodiments of the application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the application. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which are all within the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A light source structure, characterized in that: include: a laser light source, for emitting excitation light; A color wheel comprising an inner ring and an outer ring arranged concentrically, wherein the inner ring comprises a light conversion area, wherein the light conversion area generates converted light under the excitation of the excitation light, and the outer ring comprises a first guide area and a second guide area, wherein the first guide area and the second guide area are both used to guide the excitation light emitted by the laser light source; A first guiding component is used to guide the excitation light emitted from the first guiding area to be emitted along an outgoing light path; The light source structure further includes a second reflector, which is inclined at an acute angle relative to the plane where the color wheel is located, and is used to reflect the excitation light incident on the first guide area to the first guide component; The first guide assembly includes a third reflector, the third reflector being used to reflect the excitation light emitted from the first guide area. The second reflector and the third reflector are respectively arranged on opposite sides of the color wheel. The excitation light incident on the first guide area is guided to the second reflector. After being reflected by the second reflector, the excitation light enters the first guide area and is emitted to the third reflector. The third reflector reflects the excitation light to the output light path. as well as A second guiding component is used to guide the excitation light emitted from the second guiding area to the light conversion area, and is also used to guide the stimulated light emitted from the light conversion area to the output light path; the light source structure also includes a first reflector, which is located between the laser light source and the color wheel, and is used to reflect the excitation light emitted by the laser light source to the color wheel, and make the incident angle of the excitation light when it enters the outer ring of the color wheel an acute angle.

2. The light source structure according to claim 1, characterized in that: A central angle corresponding to the second guide region is equal to a central angle corresponding to the light conversion region.

3. The light source structure according to claim 1, characterized in that: The light conversion area includes a first fluorescent area and a second fluorescent area. The first fluorescent area generates a first fluorescence under the excitation of the excitation light, and the second fluorescent area generates a second fluorescence under the excitation of the excitation light. The light source structure also includes a light combining device. The first fluorescent light, the second fluorescent light and the excitation light emitted from the first guide area are combined by the light combining device and then emitted along the output light path.

4. The light source structure according to claim 1, characterized in that: The second guide assembly includes a fourth reflector and a first dichroic plate. The excitation light incident on the second guide area and guided out by the second guide area is reflected by the fourth reflector to the first dichroic plate. The first dichroic plate is used to guide the excitation light from the fourth reflector to the light conversion area and to guide the stimulated light generated by the excitation of the light conversion area.

5. The light source structure according to claim 1, characterized in that: The light source structure further includes a light combining device and a light homogenizing device. The converted light emitted from the second guiding component is guided to the light homogenizing device by the light combining device, and the excitation light emitted from the first guiding component is guided to the light homogenizing device by the light combining device.

6. The light source structure according to any one of claims 1 to 5, characterized in that: The light source structure also includes a supplementary light source and a second dichroic plate. The supplementary light source is used to emit supplementary light. The second dichroic plate is located between the color wheel and the first guide component and is used to guide the excitation light emitted by the first guide area and the supplementary light emitted by the supplementary light source to the first guide component.

7. A projection device, characterized in that: The light source structure comprises the light source structure according to any one of claims 1 to 6.

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