CN113156750A

CN113156750A - Light source structure, color wheel and projection device

Info

Publication number: CN113156750A
Application number: CN202010015489.5A
Authority: CN
Inventors: 郭祖强; 杨炳柯; 王则钦; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2020-01-07
Filing date: 2020-01-07
Publication date: 2021-07-23
Also published as: WO2021139501A1

Abstract

The invention provides a light source structure, which comprises a laser light source, a color wheel, a first guide assembly and a second guide assembly, wherein the laser light source is used for emitting exciting light. The color wheel comprises an inner ring and an outer ring which are concentrically arranged, the inner ring comprises a light conversion area, the light conversion area generates excited light under the excitation of the excited light, the outer ring comprises a first guide area and a second guide area, and the first guide area and the second guide area are used for guiding the excited light emitted by the laser light source. The first guide assembly is used for guiding the exciting light emitted from the first guide area to emit along an emitting light path. The second guiding component is used for guiding the exciting light emitted from the second guiding area to the light conversion area and is also used for guiding the excited light emitted from the light conversion area to the emergent light path. The light source structure provided by the invention has the advantages that the number of optical elements for passing exciting light is small, the energy loss is reduced, and the optical utilization rate of the light source structure is improved. The invention also provides a color wheel and a projection device.

Description

Light source structure, color wheel and projection device

Technical Field

The invention relates to the technical field of optics, in particular to a light source structure, a color wheel and a projection device.

Background

In recent years, with rapid market development and advance of component technology, the design of laser projection optical machine is also evolving and upgrading. The cost of the exciting light is lower than that of the red and green laser, so the exciting light is mostly used as the laser light source in the existing laser fluorescence light source. However, in the optical path of the conventional laser light source, the number of optical elements through which the excitation light passes is large, the energy loss is large, and the optical utilization rate is not high.

Disclosure of Invention

The invention aims to provide a light source structure, a color wheel and a projection device, which aim to solve the problem of low optical utilization rate of exciting light. The embodiment of the invention achieves the aim through the following technical scheme.

In a first aspect, the present invention provides a light source structure, which includes a laser light source, a color wheel, a first guide assembly, and a second guide assembly, wherein the laser light source is configured to emit excitation light. The color wheel comprises an inner ring and an outer ring which are concentric, the inner ring comprises a light conversion area, the light conversion area generates excited light under the excitation of exciting light, the outer ring comprises a first guide area and a second guide area, and the first guide area and the second guide area are used for guiding the exciting light emitted by the laser light source. The first guide assembly is used for guiding the exciting light emitted from the first guide area. The second guide assembly is used for guiding the exciting light emitted from the second guide area to the light conversion area and is also used for guiding the excited light emitted from the light conversion area.

In one embodiment, the central angle of the second guiding region is equal to the central angle of the light conversion region.

In one embodiment, the light conversion region includes a first fluorescence region and a second fluorescence region, the first fluorescence region is used to be excited by the excitation light to generate first fluorescence, the second fluorescence region is used to be excited by the excitation light to generate second fluorescence, the light source structure further includes a light combining device, and the first fluorescence, the second fluorescence and the excitation light emitted from the first guiding region are emitted along the emission light path after being combined by the light combining device.

In one embodiment, the light source structure further includes a first reflector, which is located between the laser light source and the color wheel, and is configured to reflect the excitation light emitted from the laser light source to the color wheel, and make an incident angle when the excitation light enters the outer ring of the color wheel be an acute angle.

In one embodiment, the light source structure further includes a second reflecting mirror inclined at an acute angle with respect to the plane of the color wheel, and the second reflecting mirror is configured to reflect the excitation light incident on the first guiding region to the first guiding component.

In one embodiment, the first guiding assembly includes a third reflecting mirror, the third reflecting mirror is configured to reflect the excitation light emitted from the first guiding region, the second reflecting mirror and the third reflecting mirror are respectively disposed on two opposite sides of the color wheel, the excitation light incident on the first guiding region is guided to the second reflecting mirror, the excitation light enters the first guiding region after being reflected by the second reflecting mirror and is emitted to the third reflecting mirror, and the third reflecting mirror reflects the excitation light to the emission light path.

In one embodiment, the plane of the first guiding region is arranged obliquely with respect to the plane of the second guiding region, and the first guiding region is used for reflecting the incident excitation light to the first guiding component.

In one embodiment, the second guiding component comprises a fourth reflecting mirror and a first dichroic filter, the excitation light incident to the second guiding region and guided out by the second guiding region is reflected by the fourth reflecting mirror to the first dichroic filter, and the first dichroic filter is used for guiding the excitation light from the fourth reflecting mirror to the light conversion region and guiding the stimulated light generated by the excitation of the light conversion region.

In one embodiment, the light source structure further includes a light combining device and a light uniformizing device, the received laser light emitted from the second guiding assembly is guided to the light uniformizing device by the light combining device, and the excitation light emitted from the first guiding assembly is guided to the light uniformizing device by the light combining device.

In one embodiment, the light source structure further includes a supplementary light source for emitting supplementary light, and a second dichroic sheet located between the color wheel and the first guide member for guiding the excitation light emitted from the first guide region and the supplementary light emitted from the supplementary light source to the first guide member.

In a second aspect, the present invention further provides a color wheel, including an inner ring and an outer ring concentrically arranged, where the outer ring includes a first guiding region and a second guiding region, the first guiding region and the second guiding region are respectively configured to guide excitation light incident thereon and enable the excitation light to exit in different directions, and the inner ring includes a light conversion region configured to generate excited light under excitation of the excitation light.

In one embodiment, the plane of the first guiding region is inclined with respect to the plane of the second guiding region, and the first guiding region is used for reflecting the excitation light.

In a third aspect, the present invention further provides a projection apparatus, which includes the light source structure of the first aspect.

Compared with the prior art, the light source structure provided by the invention has the advantages that the first guide area and the second guide area are arranged on the color wheel to respectively guide the exciting light to the first guide assembly and the second guide assembly, so that the number of optical elements which are passed by the exciting light emitted from the first guide area after being guided by the first guide assembly is small, the energy loss is reduced, and the optical utilization rate of the light source structure is improved.

These and other aspects of the invention are apparent from and will be elucidated with reference to the embodiments described hereinafter.

Drawings

In order to more clearly illustrate the technical solution in the present embodiment, the drawings needed to be used in the description of the embodiment will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

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

Fig. 2 is a schematic structural diagram of a color wheel provided in an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a light source structure according to a second embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a light source structure according to a third embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a light source structure according to a fourth embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a color wheel according to a fourth embodiment of the present invention.

Fig. 7 is a sectional view along a-a of fig. 6.

Fig. 8 is a schematic structural diagram of a light source structure according to a fifth embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a light source structure according to a sixth embodiment of the present invention.

Fig. 10 is a schematic structural diagram of a projection apparatus according to a seventh embodiment of the invention.

Detailed Description

To facilitate an understanding of the present embodiments, the present embodiments will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention 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.

Unless defined otherwise, 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 invention belongs. The terminology used herein in the present examples is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

First embodiment

Referring to fig. 1 and fig. 2, the present invention provides a light source structure 1, which includes a laser light source 11, a color wheel 10, a first guiding assembly 13 and a second guiding assembly 14, wherein the laser light source 11 is configured to emit excitation light. The color wheel 10 includes an inner ring 100 and an outer ring 110 concentrically arranged, the inner ring 100 includes a light conversion region 101, the light conversion region 101 is used for generating stimulated light under excitation of excitation light, the outer ring 110 includes a first guide region 112 and a second guide region 114, the first guide region 112 and the second guide region 114 are respectively used for guiding the excitation light incident thereon and enabling the excitation light to exit in different directions. The first guiding component 13 is used for guiding the excitation light emitted from the first guiding region 112. The second guiding component 14 is used for guiding the excitation light emitted from the second guiding region 114 to the light conversion region 101, and is also used for guiding the excited light emitted from the light conversion region 101.

Specifically, the laser light source 11 may include a laser, which may be a single laser, a laser chip, a laser diode, or the like, or other laser emitting device. It is understood that the laser source 11 may also include two, three or more lasers, multiple lasers may be arranged in an array to increase the intensity of the laser light, and multiple lasers may also be arranged non-uniformly.

In this embodiment, the laser light source 11 may be a blue light source, and the corresponding excitation light is excitation light. The cost of the blue light source is low, so the cost can be reduced by using the blue light source. The exciting light is used as the primary color light and is used as the exciting light to excite the red light and the green light and other two primary color lights, thereby being capable of mixing into white light and emitting the white light.

In other embodiments, the laser light source 11 may be a red light source, a green light source, or a violet light source.

In this embodiment, the color wheel 10 is a circular ring. In other embodiments, the color wheel 10 may also be one of circular, rectangular, elliptical, or trapezoidal.

The light source structure 1 further comprises a color wheel motor 15, and 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 rotating shaft of the color wheel motor 15, so that on one hand, the phenomenon that the local temperature is too high due to the fact that laser is applied to the same position of the color wheel 10 for a long time is avoided, and the service life of the color wheel 10 is shortened. On the other hand, the rotation of the color wheel 10 may also alternately generate fluorescent light of different colors.

The light source structure 1 further includes a light combining device 12, and the light combining device 12 is configured to combine the excited light and the excited light emitted by the first guiding assembly 13.

The light conversion region 101 includes a first fluorescence region 1011 and a second fluorescence region 1013, the first fluorescence region 1011 is used for being excited by the excitation light to emit first fluorescence, the second fluorescence region 1013 is used for being excited by the excitation light to emit second fluorescence, and the first fluorescence, the second fluorescence and the excitation light emitted from the first guide region 112 are emitted along the emission light path after being combined by the light combining device 12.

In this embodiment, the first fluorescent region 1011 is provided with red phosphor, the red phosphor may be formed on the first fluorescent region 1011 by sintering with an adhesive, or the red phosphor may be directly coated on the reflective substrate, and the first phosphor is red light. The second fluorescent region 1013 is provided with green phosphor, and the green phosphor may be formed on the second fluorescent region 1013 by sintering with an adhesive, or directly coated on a reflective substrate, and the second phosphor is green light.

In other embodiments, the first fluorescent light may be green light, and the second fluorescent light may be red light.

In other embodiments, when the light conversion region 101 includes only one region, the region may be provided with yellow phosphor, and the emitted yellow phosphor is matched with the filter to obtain red phosphor and green phosphor.

In the present embodiment, the inner ring 100 further includes an ineffective area 103, and the ineffective area 103 is disposed between the first fluorescence area 1011 and the second fluorescence area 1013. The dead zone 103 is arranged opposite to the first guiding zone 112, and the central angle corresponding to the dead zone 103 is equal to the central angle corresponding to the first guiding zone 112. The inactive area 103 may not be provided with phosphor, and may be transparent glass having a transmission function, or may be provided with a balancing device so that the color wheel 10 may be balanced during rotation.

In the present embodiment, the first guiding region 112 is a transmissive region, and the transmissive region can be used for transmission of the excitation light. The second guiding region 114 is a reflective region that can be used to reflect the excitation light to change the propagation direction of the excitation light.

In one embodiment, the first guiding region 112 may be further provided with a through hole, and the through hole may be provided with a hollow in a partial area of the first guiding region 112, or the entire area of the first guiding region 112 may be designed as a hollow. Correspondingly, the ineffective area 103 opposite to the first guiding area 112 is also a through hole, so that the color wheel 10 can keep balance during the rotation process.

In the present embodiment, the central angle corresponding to the second guiding region 114 is equal to the central angle corresponding to the light conversion region 101, that is, the central angle corresponding to the second guiding region 114 is equal to the sum of the central angles corresponding to the first fluorescent region 1011 and the second fluorescent region 1013, so that the excitation light reflected by the second guiding region 114 is guided by the second guiding component 14 to be incident on the first fluorescent region 1011 and the second fluorescent region 1013 without being incident on the ineffective region 103, and the excitation light transmitted by the first guiding region 112 does not enter the first fluorescent region 1011 and the second fluorescent region 1013, so that the excitation light does not affect the colors of the first fluorescent light and the second fluorescent light.

The light combining device 12 may be configured to combine the excitation light and the received laser light, and the first fluorescence, the second fluorescence and the excitation light passing through the first guiding region 112 are emitted along the same direction after being combined by the light combining device 12. In this embodiment, the light combining device 12 may be a blue-transparent and yellow-reflective dichroic sheet, that is, a first fluorescent light of red and a second fluorescent light of green are reflected and excitation light is transmitted. Therefore, the blue excitation light not absorbed in the first fluorescent light and the second fluorescent light is transmitted at the light combining device 12, and the color of the red and green primary light is not affected.

The light source arrangement 1 further comprises a first reflector 16 and a first positive lens 17. The first mirror 16 is located between the laser light source 11 and the color wheel 10, and is configured to reflect the excitation light emitted from the laser light source 11 to the color wheel 10, and make an incident angle when the excitation light enters the outer ring 110 of the color wheel 10 be an acute angle. The first positive lens 17 is located between the laser light source 11 and the first reflector 16, and is configured to converge the excitation light emitted from the laser light source 11 to the first reflector 16, that is, the first positive lens 17 may be configured to converge the excitation light emitted from the laser light source 11, and to make the converged excitation light enter the first reflector 16.

The light source structure 1 further includes a second reflector 18, the second reflector 18 corresponds to the outer ring 110, the second reflector 18 is inclined at an acute angle with respect to the plane of the color wheel 10, and the second reflector 18 is used for reflecting the excitation light incident to the first guiding region 112 to the first guiding component 13. The second reflecting mirror 18 is disposed obliquely with respect to the incident plane of the color wheel 10, so that the excitation light reflected and emitted from the reflecting mirror 18 can be separated from the excitation light reflected and emitted from the second guiding region 114 on the path, and the excitation light emitted from the first guiding region 112 can be separated from the excitation light emitted from the second guiding region 114 on the optical path, so that different optical devices can be adopted for guiding along different paths. The optical path separation between the excitation light emitted from the first guide region 112 and the excitation light emitted from the second guide region 114 is beneficial to efficiently utilizing the excitation light as the primary light (i.e., the excitation light emitted from the first guide region 112), and the light loss of the excitation light as the primary light through too many optical devices is avoided, that is, the number of optical elements through which the excitation light passes is small, so that the energy loss is reduced, and the optical utilization rate of the light source structure 1 is improved. When the color wheel 10 rotates to the second reflecting mirror 18 corresponding to the second guiding region 114, the excitation light is reflected by the second guiding region 114 and does not enter the second reflecting mirror 18; when the color wheel 10 rotates to the second reflecting mirror 18 corresponding to the first guiding region 112, the excitation light is transmitted by the first guiding region 112, the laser light is incident on the second reflecting mirror 18, and the laser light is reflected by the second reflecting mirror 18 to exit the color wheel 10 again through the first guiding region 112. The excitation light emitted by the laser light source 11 sequentially passes through the first positive lens 17 and the first reflecting mirror 16 and then enters the color wheel 10, and the excitation light passing through the first guiding area 112 is reflected by the second reflecting mirror 18 and then exits from the first guiding area 112 again.

The light source structure 1 further includes a light homogenizing device 19, the light homogenizing device 19 is adjacent to the light combining device 12, the received laser light emitted from the second guiding assembly 14 is guided to the light homogenizing device 19 by the light combining device 12, and the excitation light emitted from the first guiding assembly 13 is guided to the light homogenizing device 19 by the light combining device 12. In this embodiment, the light unifying means 19 may be a square bar. In other embodiments, the light uniformizing device 19 may also be a scattering sheet, a single compound eye or a double compound eye or a compound eye assembly, and the specific structure may be selected according to actual conditions, so as to satisfy the light uniformizing function. The light unifying device 19 is adjacent to the light combining device 12, specifically, the first fluorescence and the second fluorescence are reflected to the light unifying device 19 by the light combining device 12, and the excitation light passing through the first guiding region 112 passes through the light combining device 12 and then is incident to the light unifying device 19.

The first guiding assembly 13 comprises a third mirror 132, the third mirror 132 and the second mirror 18 being arranged on opposite sides of the color wheel 10, respectively. The excitation light incident on the first guiding region 112 is guided to the second reflecting mirror 18, the excitation light enters the first guiding region 112 after being reflected by the second reflecting mirror 18 and exits to the third reflecting mirror 132, and the third reflecting mirror 132 is configured to reflect the excitation light exiting from the first guiding region 112 and reflect the excitation light to an exit light path.

The first guide assembly 13 also includes a first relay lens 134. The first relay lens 134 is located between the third mirror 132 and the light combining device 12. The excitation light passing through the first guiding region 112 is reflected by the third reflecting member and then is converged to one side of the light combining device 12 by the first relay lens 134, and the first relay lens 134 can reduce the energy loss of the excitation light in the transmission process. Since the excitation light exits from the first guide region 112 and passes through only the third mirror 132 and the first relay lens 134, the number of optical elements passing through is small, so that the loss of the excitation light is less, and the optical utilization rate is higher.

The second guide member 14 includes a fourth reflecting mirror 141 and a first dichroic filter 143. The excitation light reflected by the second guide region 114 is reflected by the fourth mirror 141 to the first dichroic filter 143. The first dichroic filter 143 is configured to guide the excitation light from the fourth mirror 141 to the light conversion region 101, and is configured to guide the stimulated light generated by the excitation of the light conversion region 101 to the light combining device 12. In the present embodiment, the first dichroic filter 143 may be a yellow-transmitting and blue-reflecting dichroic filter, reflects the excitation light to the collection lens group 147, and transmits the excited first fluorescence and second fluorescence.

The second guiding assembly 14 further includes a second positive lens 145, a light unifying element 146, and a collecting lens group 147, the second positive lens 145 being located between the fourth reflecting mirror 141 and the light unifying element 146 and configured to converge the excitation light reflected by the fourth reflecting mirror 141 to the light unifying element 146. The light uniformizing element 146 is located between the second positive lens 145 and the first dichroic filter 143, and is configured to uniformize the excitation light emitted from the second positive lens 145 and direct the uniformized excitation light to the first dichroic filter 143. The collection lens group 147 includes at least two convex lenses. In the present embodiment, the collection lens group 147 includes two plano-convex lenses. In other embodiments, the lens may be a meniscus lens or a biconvex lens, and the converging action may be satisfied. The collecting lens group 147 is located between the first dichroic filter 143 and the color wheel 10, and is configured to converge the excitation light reflected from the first dichroic filter 143 to the first fluorescence region 1011 or the second fluorescence region 1013 of the inner ring 100, and further configured to converge the first fluorescence excited by the first fluorescence region 1011 and the second fluorescence excited by the second fluorescence region 1013 to the first dichroic filter 143. The collection lens group 147 may further concentrate the excitation light incident to the first fluorescence region 1011 and the second fluorescence region 1013 to improve the efficiency of exciting the first fluorescence and the second fluorescence. The excitation light reflected by the second guide region 114 is guided by the fourth mirror 141, the second positive lens 145, the light uniformizing element 146, the first dichroic filter 143, and the collecting lens group 147 in this order, and then is incident on the first fluorescence region 1011 and the second fluorescence region 1013.

In this embodiment, the second guiding assembly 14 further includes a second relay lens 149, the second relay lens 149 is located between the first dichroic filter 143 and the light combining device 12, the first fluorescent light and the second fluorescent light are converged to the other side of the light combining device 12 by the second relay lens 149, and the second relay lens 149 can reduce energy loss of the first fluorescent light and the second fluorescent light during transmission. The excited first fluorescence and the second fluorescence are guided to the light uniformizing device 19 by the collecting lens group 147, the transmission of the first dichroic filter 143, the second relay lens 149 and the light combining device 12 in this order.

In the embodiment, the excitation light incident on the first guiding region 112 is transmitted through the first guiding region 112 and then incident on the second reflecting mirror 18, reflected by the second reflecting mirror 18 and then incident on the first guiding region 112 again, transmitted through the first guiding region 112 and then incident on the third reflecting mirror 132, reflected by the third reflecting mirror 132, condensed by the first relay lens 134 and then incident on the light combining device 12, and then passes through the light combining device 12 and finally incident on the light uniformizing device 19.

The excitation light incident on the second guide region 114 is reflected by the second guide region 114, then sequentially reflected by the fourth reflector 141, reflected by the second positive lens 145 and the dodging element 146, reflected by the first dichroic filter 143, and condensed by the collecting lens group 147, then incident on the first fluorescence region 1011 and the second fluorescence region 1013, and respectively excited in the first fluorescence region 1011 and the second fluorescence region 1013 to generate first fluorescence and second fluorescence, which are sequentially condensed by the collecting lens group 147, transmitted by the first dichroic filter 143, condensed by the second relay lens 149, and reflected by the light combining device 12, and finally incident on the dodging device 19. That is, the light path of the excitation light as the illumination light is shorter than the light path of the excitation light for exciting fluorescence, and the number of components passing through is also smaller, so that the energy loss of the excitation light for illumination is reduced, and the optical utilization rate of the light source structure 1 is improved.

In summary, the light source structure 1 provided by the present invention separates the excitation light for illumination and the excitation light for exciting to generate fluorescence into different light paths and emits them through the first guide region 112 and the second guide region 114 disposed on the color wheel 10, on one hand, the excitation light for illumination does not go along the light path for generating fluorescence and the light path is shorter, and on the other hand, the optical elements through which the excitation light for illumination passes after exiting from the first guide region 112 are fewer, so that the energy loss of the excitation light for illumination is reduced, and the optical utilization rate of the light source structure 1 is improved.

Second embodiment

Referring to fig. 2 and fig. 3, different from the first embodiment, the light combining device 22 of the light source structure 2 provided in this embodiment may be a dichroic sheet that transmits yellow and reflects blue, and the first fluorescent light and the second fluorescent light may pass through the light combining device 22 and enter the light uniformizing device 29, wherein the light uniformizing device 29 may be a compound eye, a scattering sheet, or another light uniformizing device, and the excitation light passing through the first guide region 112 is reflected by the light combining device 22 to the light uniformizing device 29. That is, the first fluorescent light of red and the second fluorescent light of green are transmitted, and the excitation light is reflected. The excitation light not absorbed in the mixed first and second fluorescent light is also transmitted at the light combining means 22 and does not enter the light unifying means 29.

In this embodiment, since the light combining device 22 is a dichroic filter that transmits yellow and reflects blue, the first fluorescent light and the second fluorescent light can pass through the light combining device 22 and be incident on the light uniformizing device 29, and the transmission distance of the first fluorescent light and the second fluorescent light in the vertical direction is shortened, thereby reducing the volume of the light source structure 2.

Third embodiment

Referring to fig. 2 and 4, unlike the first embodiment, the light source structure 3 provided in this embodiment further includes a supplementary light source 33, a speckle dispersing device 34, a second dichroic plate 35, and a third relay lens 36. The complementary light source 33 is adjacent to the laser light source 11 and is used for emitting complementary light, so as to improve the light-emitting brightness and the primary color purity of the light source structure 3 and expand the color gamut space of the emergent light. The supplemental light source 33 may be a laser or a laser chip. A third relay lens 36 is located between the color wheel 10 and the second dichroic plate 35, and is configured to condense and emit the excitation light from the second reflecting mirror 38 to the second dichroic plate 35. The third relay lens 36 may reduce energy loss of the excitation light emitted from the first guide region 112 to maintain the light intensity of the excitation light. The second dichroic sheet 35 is located between the color wheel 10 and the first guide assembly 37, and is used for guiding the excitation light emitted from the first guide region 112 and the complementary light emitted from the complementary 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 removing device 34, and is used for passing the excitation light emitted from the third relay lens 36 and making the excitation light incident on the speckle removing device 34, and also for reflecting the supplementary light emitted from the supplementary light source 33 to the speckle removing device 34. The speckle reducing 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 reducing device 34 are directed to the light unifying device 39 by the third mirror 332. The speckle eliminating device 34 can scatter and diffuse the exciting light and the supplementary light, so as to eliminate the coherence of the laser light.

In the present embodiment, the supplemental light source 33 is a red light source or a green light source, and emits red supplemental light or green supplemental light. In other embodiments, the supplemental light source 33 is not limited to a red light source or a green light source, but may also be a red and green light source, i.e., a light source emitting red laser light and green laser light, 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 stimulated light, for example, when light of a certain color in the stimulated light is insufficient, the supplementary light is the light of the certain color. In this embodiment, the mixed light is directed to the light unifying device 39 by the speckle dissipating device 34, the third mirror 332, and the first relay lens 334 in this order. That is, the supplement light and the excitation light are combined, then pass through the speckle dispersing device 34, and then enter the third reflector 332.

In this embodiment, because the complementary light is added on the basis of being used as the excitation light for illumination, the complementary light can expand the color gamut range and the brightness of the fluorescence, thereby improving the light-emitting brightness and the primary color purity of the light source structure 3, and expanding the color gamut space of the emergent light.

Third embodiment

Referring to fig. 5, fig. 6 and fig. 7, different from the third embodiment, the plane of the first guiding region 412 of the light source structure 4 provided in the present embodiment is disposed obliquely with respect to the plane of the second guiding region 414, and the first guiding region 412 is used for reflecting the incident excitation light to the first guiding element 43. The second reflector 48 is disposed at the first guide area 412. Specifically, the first guiding area 412 may be chamfered, wherein the angle of the chamfer may be designed according to the actual optical path and the size of the space, and the second reflecting mirror 48 may be a reflecting surface, or may be formed on an inclined surface formed by chamfering the first guiding area 412 by a plating method or the like. It is understood that after the first guiding region 412 is chamfered, the weight of the first guiding region 412 may be increased to balance the color wheel 40 during the rotation process.

In this embodiment, the first guiding region 412 of the color wheel is set as an inclined plane, so that the excitation light is directly reflected and emitted on the inclined plane, thereby omitting the arrangement of a reflecting mirror on the back surface of the color wheel, and simultaneously avoiding light loss generated when the excitation light transmits through the color wheel.

Fifth embodiment

Referring to fig. 2 and fig. 8, different from the first embodiment, the second reflector 58 and the second dichroic sheet 55 of the light source structure 5 provided in the present embodiment are located on two opposite sides of the color wheel 10, the second reflector 58 is opposite to the outer ring 110, the excitation light incident on the first guiding region 112 is guided to the second reflector 58, reflected by the second reflector 58, passes through the first guiding region 112, and is incident on the second dichroic sheet 55, and is guided by the second dichroic sheet 55 to the light combining device 52. The second dichroic sheet 55 corresponds to the light combining device 52 and is used for guiding the excitation light emitted from the first guiding region 112 to the light combining device 52 through the first guiding assembly 51, and specifically, the second dichroic sheet 55 is located between the speckle reduction device 54 and the light uniformizing device 59, is used for eliminating the passing of the supplement light emitted from the speckles and is used for reflecting the excitation light from the second reflecting mirror 58 to the light combining device 52. The speckle removing device 54 is located between the supplementary light source 53 and the second dichroic plate 55, and is configured to remove the speckles of the supplementary light and emit the light to the second dichroic plate 55. The supplemental light passes through the despeckle device 54 and is then directed by the second dichroic plate 55 to the light combining device 52.

In this embodiment, the supplementary light is added, so that at a higher level of the excitation light power density, the supplementary light can be used as a supplement to adjust the color of the mixed primary color light to a better level, and higher brightness and wider color gamut of the optical machine are realized.

Sixth embodiment

Referring to fig. 2 and fig. 9, different from the first embodiment, the first guiding region 112 of the light source structure 6 provided in the present embodiment is a reflecting region, and the second guiding region 114 is a transmitting region. The second reflecting mirror 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-reflecting yellow-transmitting dichroic sheet, that is, the excitation light emitted from the laser light source 61 is reflected by the first guiding area 112 and then guided to the light combining device 62 through the first guiding assembly 63; the excitation light emitted from the laser light source 61 passes through the second guiding region 114, and then sequentially passes through the reflection of the second reflecting mirror 68, the guiding of the second guiding assembly 14, and the reverse color of the first dichroic filter 643 and then enters the light conversion region 101, and the received laser light generated by the light conversion region 101 passes through the first dichroic filter 643 and then enters the light combining device 62. In this embodiment, the number of the elements through which the excitation light passes is small, which can also reduce energy loss and improve the optical utilization rate of the light source structure 6.

In this embodiment, the first guiding region 112 is a reflecting region, the second guiding region 114 is a transmitting region, and since the area of the first guiding region 112 is smaller than the area of the second guiding region 114, the amount of the excitation light for exciting to generate fluorescence is larger than the amount of the excitation light for illumination, and the optical path of the excitation light for exciting to generate fluorescence is longer, so that the more energy is lost, and the increase of the amount of the excitation light for exciting to generate fluorescence can compensate for the loss of the fluorescence energy.

Seventh embodiment

Referring to fig. 10, the present invention further provides a projection apparatus 100, the projection apparatus 100 includes a light source structure 1, in this embodiment, the projection apparatus 100 further includes an optical engine 8 and a lens 9, and light emitted from the light source structure 1 is imaged by the optical engine 8 and then transmitted through the lens 9.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A light source structure, comprising:

a laser light source 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, the light conversion area generates excited light under the excitation of the excited light, 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 excited light emitted by the laser light source;

the first guide assembly is used for guiding the exciting light emitted from the first guide area to emit along an emitting light path; and

and the second guiding component is used for guiding the exciting light emitted from the second guiding area to the light conversion area and guiding the excited light emitted from the light conversion area to the emergent light path.

2. The light source structure of claim 1, wherein a central angle of the second guiding region is equal to a central angle of the light conversion region.

3. The light source structure of claim 1, wherein the light conversion region includes a first fluorescent region and a second fluorescent region, the first fluorescent region generates first fluorescent light under excitation of the excitation light, the second fluorescent region generates second fluorescent light under excitation of the excitation light, and the light source structure further includes a light combining device, and the first fluorescent light, the second fluorescent light, and the excitation light emitted from the first guide region are emitted along the emission light path after being combined by the light combining device.

4. The light source structure according to claim 1, further comprising a first reflector, located between the laser light source and the color wheel, for reflecting the excitation light emitted from the laser light source to the color wheel, and making an incident angle of the excitation light incident on an outer ring of the color wheel be an acute angle.

5. The light source structure of claim 1, further comprising a second mirror inclined at an acute angle with respect to the plane of the color wheel, the second mirror being configured to reflect the excitation light incident on the first guiding region to the first guiding component.

6. The light source structure of claim 5, wherein the first guiding assembly includes a third mirror for reflecting the excitation light emitted from the first guiding region, the second mirror and the third mirror are respectively disposed at two opposite sides of the color wheel, the excitation light incident on the first guiding region is guided to the second mirror, the excitation light enters the first guiding region after being reflected by the second mirror and is emitted to the third mirror, and the third mirror reflects the excitation light to the emission light path.

7. The light source structure of claim 1, wherein the plane of the first guiding region is disposed obliquely to the plane of the second guiding region, and the first guiding region is configured to reflect the incident excitation light to the first guiding component.

8. The structure of claim 1, wherein the second guiding component comprises a fourth mirror and a first dichroic filter, the excitation light incident to the second guiding region and guided out by the second guiding region is reflected by the fourth mirror to the first dichroic filter, and the first dichroic filter is configured to guide the excitation light from the fourth mirror to the light conversion region and guide the stimulated light generated by the excitation of the light conversion region.

9. The light source structure of claim 1, further comprising a light combining device and a light unifying device, wherein the received laser light emitted from the second guiding assembly is guided to the light unifying device by the light combining device, and the excitation light emitted from the first guiding assembly is guided to the light unifying device by the light combining device.

10. The light source structure according to any one of claims 1 to 9, further comprising a supplementary light source for emitting supplementary light, and a second dichroic sheet located between the color wheel and the first guide member for guiding the excitation light emitted from the first guide region and the supplementary light emitted from the supplementary light source to the first guide member.

11. The color wheel is characterized by comprising an inner ring and an outer ring which are concentrically arranged, wherein the outer ring comprises a first guide area and a second guide area, the first guide area and the second guide area are respectively used for guiding exciting light incident on the first guide area and emitting the exciting light along different directions, the inner ring comprises a light conversion area, and the light conversion area is used for generating excited light under the excitation of the exciting light.

12. The color wheel of claim 11 wherein the plane of the first guiding region is disposed obliquely with respect to the plane of the second guiding region, the first guiding region being configured to reflect the excitation light.

13. A projection device comprising a light source structure according to any one of claims 1-10.