WO2021238891A1 - 棱镜组件、发光装置和投影系统 - Google Patents

棱镜组件、发光装置和投影系统 Download PDF

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Publication number
WO2021238891A1
WO2021238891A1 PCT/CN2021/095686 CN2021095686W WO2021238891A1 WO 2021238891 A1 WO2021238891 A1 WO 2021238891A1 CN 2021095686 W CN2021095686 W CN 2021095686W WO 2021238891 A1 WO2021238891 A1 WO 2021238891A1
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Prior art keywords
light
prism
splitting element
incident
polarization
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PCT/CN2021/095686
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English (en)
French (fr)
Inventor
方元戎
郭祖强
陈晨
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深圳光峰科技股份有限公司
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Publication of WO2021238891A1 publication Critical patent/WO2021238891A1/zh

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2073—Polarisers in the lamp house

Definitions

  • This application relates to the technical field of light-emitting devices, in particular to prism assemblies, light-emitting devices and projection systems.
  • the laser has the advantages of high brightness and long life, but its spectrum is very narrow.
  • the high coherence of the laser makes the speckle effect of the projected image more obvious, which seriously affects the imaging quality. Therefore, the laser is often used to excite the fluorescent material in use. Form a mixed light.
  • the mixed light formed in the light-emitting device enters the subsequent optical system far away, which dilutes the amount of optical expansion, so that the energy cannot be fully utilized by the optical machine, and ultimately results in the inefficiency of the light source. high.
  • This application proposes a prism assembly, a light emitting device and a projection system, so that the angular distribution of incident light does not change when propagating in the prism, so as to reduce the area of the beam splitting element, reduce the dilution of the expansion amount, and improve the efficiency of the light source.
  • the prism assembly includes a prism.
  • the prism includes a light-incident surface, a functional surface opposite to the light-incident surface, and a light splitting element arranged between the light-incident surface and the functional surface. ;
  • the incident light is transmitted to the light-splitting element via the light-incident surface, and the light-splitting element is used to reflect at least part of the incident light out of the prism, and the rest of the incident light passes through the light-splitting element to reach the functional surface.
  • the prism assembly also includes an optical processing element arranged on the functional surface;
  • the light splitting element is used to reflect part of the incident light out of the prism, and transmit the remaining part of the incident light to form bypass light and irradiate it to the optical processing element; the bypass light is processed by the optical processing element and then returns to the light splitting element, and then The beam splitting element reflects out of the prism.
  • the optical processing element includes a mirror.
  • the beam splitting element is a polarization beam splitting element, and the polarization beam splitting element is used to reflect the incident light in the first polarization state and transmit the incident light in the second polarization state to form the bypass light and irradiate the optical processing element;
  • the optical processing components include a mirror and a quarter-wave plate.
  • the quarter-wave plate is located between the mirror and the polarization beam splitter.
  • the quarter-wave plate and the mirror are used to change the polarization direction of the bypass light.
  • the bypass light after the polarization direction can be reflected out of the prism by the polarization beam splitting element.
  • the prism includes four side surfaces connecting the light incident surface and the functional surface, the four side surfaces are respectively perpendicular to the light incident surface and the functional surface, and at least one set of opposite side surfaces are parallel to each other.
  • this application proposes a light emitting device, which includes a light source, a prism assembly and a wavelength conversion device;
  • the light source is used to emit excitation light
  • the prism assembly includes a prism, the prism includes a light incident surface, a functional surface opposite to the light incident surface, and a light splitting element arranged between the light incident surface and the functional surface, and a light source is arranged on one side of the light incident surface of the prism;
  • the wavelength conversion device is used to absorb the excitation light and be stimulated to emit the laser light propagating to the prism;
  • the excitation light of the light source is transmitted to the light splitting element provided in the prism through the light incident surface of the prism.
  • the light splitting element is used to emit at least part of the excitation light to the wavelength conversion device, and the rest of the excitation light passes through the light splitting element to reach the functional surface.
  • the light emitting device also includes a homogenizing device
  • the light homogenizing device is arranged between the light source and the prism, and the light emitting surface of the light homogenizing device is closely attached to the light incident surface of the prism; the area of the light incident surface of the prism matches the size of the light spot emitted by the light homogenizing device.
  • the prism assembly further includes an optical processing element arranged on the functional surface, and the beam splitting element is located between the optical processing device and the light incident surface;
  • the spectroscopic element is used to reflect part of the excitation light to the wavelength conversion device, and transmit the remaining part of the excitation light to form bypass light and irradiate it to the optical processing element; the bypass light is processed by the optical processing element and then returns to the spectroscopic element.
  • the light splitting element reflects and forms the second outgoing light.
  • the light splitting element is a polarization light splitting element, and the polarization light splitting element is used to reflect the excitation light of the first polarization state to the wavelength conversion device. At least part of the light emitted from the wavelength conversion device vertically enters one side of the prism, and is parallel to the other side of the prism through the prism. Eject from the side, transmit the excitation light of the second polarization state to form bypass light and irradiate the optical processing element;
  • the optical processing device includes a reflector and a quarter wave plate.
  • the quarter wave plate is located between the reflector and the polarization beam splitter.
  • the quarter wave plate and the reflector are used to change the polarization direction of the bypass light so as to change the polarization direction of the bypass light.
  • the bypass light after the polarization direction can be reflected by the polarization splitting element to form the second outgoing light.
  • At least part of the light emitted by the wavelength conversion device vertically enters one side surface of the prism, and exits through the other side surface of the prism parallel and opposite to the side surface.
  • this application proposes a projection system, which includes the above-mentioned prism assembly and/or the above-mentioned light-emitting device.
  • the incident light passes through the light-incident surface of the prism to the light-splitting element arranged between the light-incident surface and the functional surface.
  • the angular distribution does not change, and the area of the light-splitting element can be reduced. Reduce the dilution of the expansion volume and improve the efficiency of the light source.
  • Fig. 1 is a schematic diagram of the structure of the prism component of the present application
  • Fig. 2 is a schematic structural diagram of an embodiment of the prism assembly of the present application
  • Fig. 3 is a schematic structural diagram of an embodiment of a light-emitting device of the present application.
  • FIG. 4 is a schematic structural diagram of an embodiment of a wavelength conversion device in the light-emitting device of the present application.
  • FIG. 5 is a schematic structural diagram of another embodiment of the light-emitting device of the present application.
  • the present application provides a prism assembly.
  • the prism 12 in the prism assembly 10 includes a light incident surface 121 and a functional surface 122.
  • the functional surface 122 is opposite to the light incident surface 121.
  • the light splitting element 13 is disposed between the light incident surface 121 and the functional surface 122, the incident light is transmitted to the light splitting element 13 via the light incident surface 121, and the light splitting element 13 is used to reflect at least part of the incident light out of the prism 12.
  • an inclined surface may also be provided inside the prism 12, and the entire inclined surface is plated with a light-splitting film to form the light-splitting element 13.
  • the inclined surface can be arranged at an inclination angle of 45°.
  • the setting angle of the inclined plane is not limited to this, for example, the inclined plane may also be arranged at an inclination angle of 30°.
  • the beam splitting element 13 may be a polarization beam splitting element.
  • the polarization splitting element can only have polarization splitting characteristics for the light whose polarization state is the same as that of the incident light, so as to prevent the light whose emission color or polarization state is different from that of the incident light from being polarized and split by the splitting element 13, and avoid the light emission color or polarization state of the incident light. Different lights cannot pass through the spectroscopic element 13 at all.
  • the light splitting element 13 may be a wavelength splitting element.
  • the wavelength splitting element can only have wavelength splitting characteristics for the light whose emission color or wavelength is the same as that of the incident light, so as to prevent the light that is different from the emission color or wavelength of the incident light from being wavelength split by the light splitting element 13, and avoid the emission color of the incident light.
  • all lights with different emission wavelengths cannot pass through the spectroscopic element 13.
  • the spectroscopic element 13 may be a reflective sheet.
  • the reflective sheet may only have reflection and spectroscopy characteristics for light having the same emission color or wavelength as the incident light, so as to prevent the light that is different from the emission color or emission wavelength of the incident light from being unable to pass through the spectroscopic element 13 completely.
  • the prism assembly 10 of the present application may further include an optical processing element 17.
  • the beam splitting element 13 can be used to reflect part of the incident light out of the prism 12 and transmit the remaining part of the incident light to form a bypass light and irradiate the optical processing element 17.
  • the optical processing element 17 is used for processing the bypass light and returning to the beam splitting element 13, and is reflected out of the prism 12 by the beam splitting element 13.
  • the optical processing element 17 is disposed on the functional surface of the prism 12. And the light splitting element 13 is located between the optical processing element 17 and the light incident surface. In this way, the beam splitter element 13 reflects part of the incident light out of the prism 12, and transmits the remaining part of the incident light to form a bypass light and irradiate it to the optical processing element 17.
  • the optical processing element 17 can process the bypass light and return to the beam splitter.
  • the element 13 is reflected from the prism 12 by the beam splitting element 13.
  • the configuration of the optical processing element 17 can be adjusted reasonably based on the light splitting principle of the light splitting element 13.
  • the beam splitting element 13 is a polarization beam splitting element. Since the polarization state of the incident light may be impure, part of the incident light may pass through the beam splitting element 13, causing loss of light energy and reducing the efficiency of the light source.
  • the optical processing element 17 can be used to change the polarization state of the incident light passing through the beam splitter element 13, so that the light whose polarization state is changed can be reflected by the beam splitter element 13, thereby improving the efficiency of the light source.
  • the optical processing element 17 in this embodiment may include a mirror 171 and a quarter-wave plate 172.
  • the quarter-wave plate 172 is located between the mirror 171 and the beam splitting element 13, 1/
  • the 4-wave plate 172 and the reflecting mirror 171 cooperate to change the polarization direction of the bypass light, so that the bypass light whose polarization direction is changed can be reflected by the beam splitting element 13 out of the prism 12.
  • the light splitting element 13 may be a reverse p-transmitting s polarization splitting element or a reverse s-transmitting p polarization splitting element.
  • the incident light is blue light
  • the light splitting element 13 is an anti-s-polarized blue light penetrating p-polarized blue light polarizing light splitting element. After reflection, it will pass through the quarter-wave plate 172 again. At this time, the circularly polarized light will be converted into s blue light and enter the beam splitting element 13 along the original optical path.
  • the p blue light transmitted by the light splitting element 13 is converted into s blue light and returned to the light splitting element 13 to make full use of the p blue light transmitted from the light splitting element 13.
  • the beam splitting element 13 is a polarization beam splitting element, to ensure that the beam splitting element 13 at least reflects most of the incident light out of the prism 12, the polarization direction of most of the incident light is the same as the polarization direction of the light reflected by the beam splitting element 13. For example, if the incident light is at least mostly s light, the light splitting element 13 can reflect s incident light and transmit p incident light.
  • the beam splitting element 13 is a wavelength beam splitting element, and further, the beam splitting element 13 may be a reflective sheet.
  • the optical processing element 17 may include only the mirror 171. In this way, the reflector 171 can reflect the bypass light to the beam splitting element 13, and the beam splitting element 13 can reflect at least part of the bypass light out of the prism 12, which can make full use of the excitation light transmitted through the beam splitting element 13.
  • the configuration of the processing element 17 is again very simple.
  • the reflectivity of the reflective sheet can be adjusted according to requirements.
  • the reflectivity of the reflective sheet is 50%, 60%, 70%, 80%, 90%, etc.
  • the incident light is transmitted to the beam splitter 13 arranged between the light incident surface 121 and the functional surface 122 via the light incident surface of the prism 12, and the angular distribution of the incident light does not change when it propagates through the prism 12.
  • the area of the spectroscopic element 13 can be reduced, thereby reducing the dilution of the expansion amount and improving the efficiency of the light source.
  • the prism 12 may further include a side surface connecting the light incident surface 121 and the functional surface 122.
  • the light incident surface 121, the functional surface 122, and the side surface of the prism 12 may all be optical planes.
  • the number of sides can be adjusted according to specific conditions.
  • the prism 12 includes at least four sides. More preferably, the prism 12 includes four sides. Most preferably, the prism 12 has a rectangular parallelepiped shape.
  • At least one set of opposite sides are parallel to each other.
  • the light enters one side of the prism 12 perpendicularly, and can exit vertically through the other side of the prism 12 parallel to the side surface.
  • the distance of the light traveling in the prism 12 can be as consistent as possible, and the uniformity of the light propagating through the prism 12 can be improved.
  • the subsequent optical elements since the vertical emission does not cause the further increase of the optical expansion, it is convenient for the subsequent optical elements to collect and utilize the light beam.
  • the opposite sides of all groups are parallel to each other.
  • two adjacent sides can also be perpendicular to each other.
  • the side surfaces can be perpendicular to the light-incident surface and the functional surface, respectively.
  • the present application provides a light emitting device.
  • the light-emitting device 1 includes a light source 11, the prism assembly 10 of the above-mentioned embodiment, and a wavelength conversion device 14.
  • the light source 11 is used to emit excitation light.
  • a light source 11 is arranged on the side of the light incident surface of the prism 12.
  • a beam splitting element 13 is provided in the prism 12.
  • the excitation light of the light source 11 is transmitted to the spectroscopic element 13 provided in the prism 12 through the light incident surface of the prism 12.
  • the spectroscopic element 13 is used to emit at least part of the excitation light to the wavelength conversion device 14, and the wavelength conversion device 14 is used to absorb the excitation light and The stimulated emission of the laser light propagated to the prism 12.
  • the light source 11 is used to emit excitation light.
  • the light source 11 may be a laser light source including one luminous color.
  • the excitation light emitted by the light source 11 is absorbed and excited by the wavelength conversion device 14 to generate a received laser light, and the combination of the excitation light and the received laser light can form the first emitted light.
  • the received laser light may include at least two colors of light or a composite light of at least two colors of light, so that the received laser light and the excitation light can be combined to form white outgoing light.
  • the light source 11 may be a blue laser light source array composed of several blue lasers.
  • the blue excitation light is absorbed and excited by the wavelength conversion device 14 to produce green and red lasers, green and red lasers.
  • Blue excitation light can be combined with light to form white outgoing light. It can be understood that the light source 11 may not be limited to a blue light source, and may also be a purple light source, a red light source, a green light source, or the like.
  • the excitation light emitted by the light source 11 is transmitted to the beam splitting element 13 arranged in the middle of the prism 12 via the light incident surface of the prism 12.
  • the angular distribution of the excitation light will not change when it propagates in the prism 12, and the beam splitting element 13 can be reduced. This reduces the distance of the received laser light into the subsequent optical system, reduces the dilution of the expansion, and improves the efficiency of the light source.
  • an inclined surface may be provided in the middle of the prism 12, and the entire inclined surface is plated with a light-splitting film to form the light-splitting element 13.
  • the inclined surface can be arranged at an inclination angle of 45°.
  • the installation angle of the inclined plane is not limited to this, and it can be specifically determined according to the installation positions of the light source 11 and the wavelength conversion device 14.
  • the beam splitting element 13 may be a polarization beam splitting element.
  • the polarization splitting element is used to reflect the excitation light in the first polarization state to the wavelength conversion device, and transmit the excitation light in the second polarization state to form the bypass light and irradiate it to the optical processing element, thus preventing The received laser light is polarized and split by the light splitting element 13 so that all the received laser light cannot pass through the light splitting element 13.
  • the light splitting element 13 may be a wavelength splitting element.
  • the wavelength splitting element may only have wavelength splitting characteristics for light having the same emission color or wavelength as the excitation light, so as to prevent the received laser light from being wavelength split by the splitting element 13 so that all the received laser light cannot pass through the splitting element 13.
  • the light splitting element 13 may be a reflective sheet. The reflective sheet can only reflect and disperse light with the same emission color or wavelength as the excitation light, so as to prevent the received laser light from being reflected and split by the light splitting element 13 so that all the received laser light cannot pass through the light splitting element 13.
  • the spectroscopic element 13 is used to reflect at least part of the excitation light to the wavelength conversion device 14.
  • the wavelength conversion device 14 absorbs the excitation light and generates the received laser light that propagates to the prism 12.
  • the wavelength conversion device 14 may be circular, square or other shapes, and there is no limitation here. In this embodiment, a circle is taken as an example for description.
  • the wavelength conversion device 14 may include a conversion area, a non-conversion area, and a driving device disposed at the bottom of the wavelength conversion device 14.
  • the conversion area and the non-conversion area are alternately located on the optical path where the excitation light emitted by the light source 11 is located under the action of the driving unit.
  • the conversion area and the non-conversion area may be respectively located in part of the same circular ring, and form a circular ring with a through hole in the center after being spliced with each other.
  • the conversion area and the non-conversion area can be set continuously or intermittently.
  • At least one wavelength conversion material can be arranged on the conversion zone to generate at least one color of the lasing under the excitation of the excitation light.
  • the wavelength conversion material can be phosphor, quantum dot material and phosphorescent material.
  • the emission color of the wavelength conversion material can be set according to the color of the excitation light, so that the excitation light and the received laser light of at least one color emitted by the wavelength conversion device 14 can be combined to form white outgoing light.
  • the emission color of the wavelength conversion material when the color of the excitation light is blue, the emission color of the wavelength conversion material is yellow-green.
  • the emission colors of the wavelength conversion material when the color of the excitation light is blue, the emission colors of the wavelength conversion material are red and green. It is understandable that, in addition to red, green, and yellow-green, the luminous color of the wavelength conversion material may also be other colors, which are not limited here.
  • the conversion area can be divided into at least two sub-conversion areas, and each wavelength conversion material is arranged in a one-to-one correspondence.
  • the wavelength conversion material provided on the wavelength conversion device 14 includes a red wavelength conversion material and a green wavelength conversion material.
  • the conversion area is also divided into a first sub-conversion area and a second sub-conversion area.
  • the red wavelength conversion material is provided in the first sub-conversion area.
  • the green wavelength conversion material is arranged on the second sub-conversion area.
  • the sub-conversion area may be continuously set, or may be discontinuously set.
  • the areas of different sub-conversion regions may be equal or not equal.
  • the structure of the wavelength conversion device 14 is as shown in FIG. Distributed arc areas, and the center of each arc area is the center of rotation of the wavelength conversion device 14.
  • the sum of the central angle radii of the first sub-conversion area 141, the second sub-conversion area 142, and the non-conversion area 143 is 360 degrees .
  • the light emitting device 1 may further include a light homogenizing device 16 arranged between the light source 11 and the prism 12.
  • the homogenizing device 16 is used to shape the angular distribution of the excitation light emitted by the light source 11 to generate a uniformly distributed light spot.
  • the light homogenizing device 16 is a double compound eye or a light homogenizing rod, and it is not limited thereto.
  • the light-emitting surface of the light homogenizing device 16 is close to the light-incident surface of the prism 12, or directly attached to the light-incident surface of the prism 12, and the area of the light-incident surface of the prism 12 is the same as the light spot emitted by the light homogenizing device 16.
  • the inventor of the present application found that when the first emitted light reaches the area of the beam splitter 13, the received laser light and a part of the excitation light pass through the beam splitter 13, and the other part of the excitation light is reflected by the beam splitter 13, so that part of the excitation light cannot pass through the beam splitter.
  • the element 13 causes the color of the emitted light leaving the area of the light splitting element 13 to be inconsistent with the preset color, that is, the color of the first emitted light leaving the area of the light splitting element 13 is not uniform. For example, when the excitation light is blue light, part of the blue light cannot pass through the light splitting element 13, resulting in a yellowish color of the first outgoing light leaving the area of the light splitting element 13.
  • both the received laser light and the excited light can pass through, and will not be reflected out. Because of the effect of the light splitting element 13, only the area of the light splitting element 13 will reflect a part of the excitation light, so that the light colors of the first outgoing light leaving the area of the light splitting element 13 and the area other than the light splitting element 13 are inconsistent, making it leave the area of the prism 12
  • the color of the first emitted light is uneven, which in turn will cause the color of the final projected picture to be uneven.
  • the prism assembly of the present application further includes an optical processing element 17.
  • the excitation light is processed and returned to the beam splitting element 13, so that the beam splitting element 13 reflects this part of the light and forms the second outgoing light.
  • the first outgoing light can be combined with the second outgoing light to be emitted.
  • the excitation light can reduce the problem of uneven color of the light emitted by the light-emitting device 1 through the second emitted light, and improve the efficiency of the light source.
  • the optical processing element 17 is disposed on the functional surface of the prism 12. And the light splitting element 13 is located between the optical processing element 17 and the light incident surface. In this way, when the spectroscopic element 13 reflects part of the excitation light to the wavelength conversion device 14, and transmits the remaining part of the excitation light to form bypass light and irradiate it to the optical processing element 17, the optical processing element 17 can process the bypass light and return to The dichroic element 13 is reflected by the dichroic element 13 to form the second outgoing light, which is used to reduce the problem of uneven color of the light emitted by the light-emitting device 1 and improve the efficiency of the light source.
  • the configuration of the optical processing element 17 can be adjusted reasonably based on the light splitting principle of the light splitting element 13.
  • the beam splitter 13 is a polarization beam splitter. Since the polarization state of the excitation light emitted by the light source 11 may be impure, part of the excitation light may pass through the beam splitter 13, causing light Energy is lost, and the efficiency of the light source is reduced.
  • the optical processing element 17 can be used to change the polarization state of the excitation light transmitted through the light splitting element 13 so that the light whose polarization state is changed can be reflected by the light splitting element 13 and form a second outgoing light, which improves the efficiency of the light source.
  • the optical processing element 17 may include a mirror 171 and a quarter-wave plate 172.
  • the quarter-wave plate 172 is located between the mirror 171 and the beam splitting element 13, and the quarter-wave plate 172 and The reflecting mirror 171 is used to change the polarization direction of the bypass light, so that the bypass light after the polarization direction is changed can be reflected by the light splitting element 13 to form the second outgoing light.
  • the light splitting element 13 may be a polarizing light splitting element that transmits reverse p excitation light and transmits s excitation light or a polarization light splitting element that transmits reverse s excitation light and transmits p excitation light.
  • the excitation light is blue light
  • the light splitting element 13 is an anti-s-polarized blue light transmitting p-polarized blue light polarization splitting element.
  • the p blue light will be converted into circularly polarized light when it passes through the quarter-wave plate 172 for the first time, and it will be converted into circularly polarized light by the reflecting mirror 171. After reflection, it will pass through the quarter-wave plate 172 again.
  • the circularly polarized light will be converted into s blue light and enter the beam splitting element 13 along the original light path, and be reflected by the beam splitting element 13 to form the second outgoing light.
  • the p blue light transmitted by the light splitting element 13 is converted into s blue light and returned to the light splitting element 13 to make full use of the p blue light transmitted from the light splitting element 13.
  • the beam splitting element 13 is a polarization beam splitting element, in order to ensure that the beam splitting element 13 at least reflects most of the excitation light emitted by the light source 11 to the wavelength conversion device 14, the polarization direction of most of the excitation light emitted by the light source 11 is reflected by the beam splitting element 13.
  • the polarization direction of the light is the same. For example, if at least most of the excitation light emitted by the light source 11 is s light, the light splitting element 13 can reflect the s excitation light and transmit the p excitation light.
  • the beam splitting element 13 is a wavelength beam splitting element, and further, the beam splitting element 13 may be a reflective sheet.
  • the optical processing element 17 may include only the mirror 171. In this way, the reflector 171 can reflect the bypass light to the beam splitting element 13, and the beam splitting element 13 can reflect at least part of the bypass light to form a second outgoing light, which can make full use of the excitation light transmitted through the beam splitting element 13. ,
  • the configuration of the optical processing element 17 is very simple.
  • the reflectivity of the reflective sheet can be adjusted according to requirements.
  • the reflectivity of the reflective sheet is 50%, 60%, 70%, 80%, 90%, etc.
  • the light-emitting device 1 may further include a first collection device 18 located between the light homogenization device 16 and the light source 11.
  • the first collection device 18 is used to collect the excitation light and emit it into the homogenization device 16, which can compress the spot size.
  • the area of the light splitting element 13 can be further reduced, the distance from which the first emitted light enters the subsequent optical system can be reduced, and the efficiency of the light source can be improved.
  • the first collection device 18 may be a positive and negative lens group.
  • the light-emitting device 1 may further include a second collection device 19 located between the beam splitting element 13 and the wavelength conversion device 14 for imaging the excitation light reflected by the beam splitting element 13 on the wavelength conversion device 14 after the face angle is changed. Then, the first outgoing light formed by the wavelength conversion device 14 is condensed and then emitted.
  • the second collecting device 19 may be a collecting lens.
  • the second collecting device 19 can be close to the side of the prism 12, and because the area of the beam splitting element 13 is relatively small, this will reduce the distance of the light emitted by the second collecting device 19 into the subsequent optical system, so that it enters the subsequent optical system. The light spot is reduced, thereby reducing the solid angle at the panel and improving the efficiency of the system through the lens.
  • the light emitted by the second collection device 19 can be perpendicularly incident on one side of the prism 12 and emitted from the other side of the prism 12; and one side of the prism 12 and the other side of the prism 12 are parallel to each other, so that the second collection
  • the distance that the light emitted by the device 19 travels in the prism 12 can be as uniform as possible, so that the uniformity of the light emitted by the light-emitting device 1 is higher.
  • the above is an embodiment of the light-emitting device 1 provided in this application.
  • This application also provides a projection system.
  • the projection system includes a light-emitting device 1.
  • the light-emitting device 1 is the light-emitting device 1 provided by any of the above-mentioned embodiments and has The technical features and technical effects of, will not be repeated here.
  • the excitation light emitted by the light source 11 is transmitted through the light incident surface of the prism 12 to the spectroscopic element 13 arranged in the middle of the prism 12.
  • the spectroscopic element 13 reflects at least part of the excitation light to the wavelength conversion device 14, and the wavelength conversion device 14 absorbs the excitation light.
  • the angular distribution of the excitation light will not change when propagating in the prism 12, the area of the beam splitter 13 can be reduced, thereby reducing the distance of the received laser light entering the subsequent optical system, and reducing the amount of expansion Dilute to improve the efficiency of the light source.

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Abstract

棱镜组件（10）、发光装置（1）和投影系统。棱镜组件（10）中的棱镜（12）包括入光面（121）、与入光面（121）相对的功能面（122）以及设置在入光面（121）与功能面（122）之间的分光元件（13）；其中，入射光经由入光面（121）传递至分光元件（13），分光元件（13）用于将至少部分入射光反射出于棱镜（12）外。入射光在棱镜（12）中传播时角分布不改变，以减小分光元件（13）的面积，减小扩展量的稀释，提高光源的效率。

Description

棱镜组件、发光装置和投影系统 技术领域
本申请涉及发光器件技术领域，尤其涉及棱镜组件、发光装置和投影系统。
背景技术
目前，激光光源的应用已经越来越得到人们的重视。激光具有高亮度、长寿命的优点，但其光谱很窄，同时激光的高相干性使得投影图像的散斑效应比较明显，严重影响了成像质量，因此在使用中往往是利用激光激发荧光材料来形成混合发光。
现有技术中，由于发光装置的结构配置导致发光装置中形成的混合光进入后续光学系统的距离较远，稀释了光学扩展量，使得能量不能完全被光机所利用，最终导致光源的效率不高。
发明内容
本申请提出棱镜组件、发光装置和投影系统，使得入射光在棱镜中传播时角分布不改变，以减小分光元件的面积，减小扩展量的稀释，提高光源的效率。
为解决上述目的，本申请提出一种棱镜组件，棱镜组件中包括一棱镜，所述棱镜包括入光面、与入光面相对的功能面以及设置在入光面与功能面之间的分光元件；
其中，入射光经由入光面传递至分光元件，分光元件用于将至少部分入射光反射出于棱镜外，其余入射光透射所述分光元件后到达所述功能面。
其中，棱镜组件还包括设置在功能面上的光学处理元件；
分光元件用于将部分入射光反射出于棱镜外，并将剩余部分入射光 透过以形成旁路光并照射至光学处理元件；旁路光经由光学处理元件进行处理后返回到分光元件，再经分光元件反射出于棱镜外。
其中，光学处理元件包括反射镜。
其中，分光元件为偏振分光元件，偏振分光元件用于反射第一偏振态的入射光，透射第二偏振态的入射光以形成所述旁路光并照射至所述光学处理元件；
光学处理元件包括反射镜和1/4波片，1/4波片位于反射镜和偏振分光元件之间，1/4波片和反射镜配合用于改变旁路光的偏振方向，以让改变偏振方向后的旁路光能被偏振分光元件反射出于棱镜外。
其中，棱镜包括连接入光面和功能面的四个侧面，四个侧面分别与入光面和功能面垂直，且至少一组相对的侧面相互平行。
为解决上述目的，本申请提出一种发光装置，该发光装置包括光源、棱镜组件和波长转换装置；
光源用于发射激发光；
棱镜组件包括一棱镜，棱镜包括入光面、与入光面相对的功能面以及设置在入光面与功能面之间的分光元件，棱镜的入光面一侧配置有光源；
波长转换装置用于吸收激发光并受激发射出向棱镜传播的受激光；
其中，光源的激发光经由棱镜的入光面传递至棱镜中设置的分光元件，分光元件用于将至少部分激发光发射至波长转换装置，其余激发光透射分光元件后到达功能面。
其中，发光装置还包括匀光装置；
匀光装置设置在光源和棱镜之间，匀光装置的出光面紧贴着棱镜的入光面；棱镜的入光面面积与匀光装置出射光斑的大小相匹配。
其中，棱镜组件还包括设置在功能面上的光学处理元件，分光元件位于光学处理装置和入光面之间；
分光元件用于将部分激发光反射至波长转换装置，并将剩余部分激发光透过以形成旁路光并照射至光学处理元件；旁路光经由光学处理元件进行处理后返回到分光元件，经分光元件反射形成第二出射光。
其中，分光元件为偏振分光元件，偏振分光元件用于将第一偏振态的激发光反射至波长转换装置至少部分出射的光垂直射入棱镜的一侧面，并经棱镜与侧面平行相对的另一侧面射出，将第二偏振态的激发光透射形成旁路光并照射至光学处理元件；
光学处理装置包括反射镜和1/4波片，1/4波片位于反射镜和偏振分光元件之间，1/4波片和反射镜配合用于改变旁路光的偏振方向，以让改变偏振方向后的旁路光能被偏振分光元件反射形成第二出射光。
其中，波长转换装置至少部分出射的光垂直射入棱镜的一侧面，并经棱镜与侧面平行相对的另一侧面射出。
为解决上述目的，本申请提出一种投影系统，该投影系统包括上述的棱镜组件和/或上述的发光装置。
本申请中入射光经由棱镜的入光面，传递至设置在入光面和功能面之间的分光元件，入射光在棱镜中传播时角分布不会改变，可以减小分光元件的面积，从而减小扩展量的稀释，提高光源效率。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请棱镜组件的结构示意图；
图2是本申请棱镜组件一实施方式的结构示意图；
图3是本申请发光装置一实施例的结构示意图；
图4是本申请发光装置中波长转换装置一实施例的结构示意图；
图5是本申请发光装置另一实施例的结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本申请的一部分实 施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
在一方面，本申请提供一棱镜组件。请参阅图1，棱镜组件10中的棱镜12包括入光面121和功能面122。其中，功能面122与入光面121相对。分光元件13设置在入光面121与功能面122之间，入射光经由入光面121传递至分光元件13，分光元件13用于将至少部分入射光反射出于棱镜12外。具体地，棱镜12内部还可设置有一斜面，整个斜面上镀有分光膜，以形成分光元件13。可选地，该斜面可呈45°倾角设置。当然斜面的设置角度不限于此，例如，该斜面还可呈30°倾角设置。
可选地，分光元件13可以为偏振分光元件。其中偏振分光元件可以仅对与入射光偏振态相同的光具有偏振分光特性，这样防止与入射光发光颜色或偏振态不相同的光被分光元件13偏振分光，避免与入射光发光颜色或偏振态不相同的光无法全部透过分光元件13。
可选地，分光元件13可以为波长分光元件。其中波长分光元件可以仅对与入射光发光颜色或发光波长相同的光具有波长分光特性，这样防止与入射光发光颜色或发光波长不相同的光被分光元件13波长分光，避免与入射光发光颜色或发光波长不相同的光无法全部透过分光元件13。例如，分光元件13可以为反射片。其中反射片可以仅对与入射光发光颜色或发光波长相同的光具有反射分光特性，这样避免与入射光发光颜色或发光波长不相同的光无法全部透过分光元件13。
本申请的棱镜组件10可进一步包括光学处理元件17。分光元件13可用于将部分入射光反射出于棱镜12外，并将剩余部分入射光透过以形成旁路光并照射至光学处理元件17。光学处理元件17用于对旁路光进行处理并返回到分光元件13，经分光元件13反射出于棱镜12外。
其中，光学处理元件17设置于棱镜12的功能面上。并且分光元件13位于光学处理元件17和入光面之间。这样分光元件13将部分入射光反射出于棱镜12外，并透过剩余部分入射光以形成旁路光并照射至光学处理元件17，光学处理元件17可以对旁路光进行处理后返回到分光 元件13，经分光元件13反射出于棱镜12外。
为对透过分光元件13的入射光进行充分利用，可以基于分光元件13的分光原理合理调整光学处理元件17的配置。
在一实现方式中，分光元件13为偏振分光元件，由于入射光偏振态可能存在着不纯的问题，入射光中的部分光可能会透过分光元件13，造成光能损失，光源效率降低。利用光学处理元件17可以改变透过分光元件13的入射光的偏振态，以让偏振态改变后的光能被分光元件13反射出去，提高了光源效率。具体地，如图2所示，本实施方式中的光学处理元件17可以包括反射镜171和1/4波片172，1/4波片172位于反射镜171和分光元件13之间，1/4波片172和反射镜171配合用于改变旁路光的偏振方向，以让改变偏振方向后的旁路光能被分光元件13反射出于棱镜12外。
其中，分光元件13可以为反p透s偏振分光元件或反s透p偏振分光元件。
示例性地，入射光为蓝光，分光元件13为反s偏振蓝光透p偏振蓝光偏振分光元件，p蓝光在第一次过1/4波片172时会被转为圆偏光，被反射镜171反射后会再次过1/4波片172，此时，圆偏光会被转化为s蓝光，并随原光路入射至分光元件13，被分光元件13反射出于棱镜12外，这样就可以将从分光元件13透过的p蓝光转化为s蓝光并返回到分光元件13，以对从分光元件13透过的p蓝光进行充分利用。
另外，在分光元件13为偏振分光元件时，为保证分光元件13至少将大部分入射光反射出于棱镜12外，大部分入射光的偏振方向与分光元件13反射的光的偏振方向相同。例如，入射光至少大部分为s光，那分光元件13能够反射s入射光，透射p入射光。
在另一实现方式中，分光元件13为波长分光元件，进一步的，分光元件13可以为反射片。光学处理元件17可以只包括反射镜171。这样反射镜171就可以将旁路光反射到分光元件13上，分光元件13可以将至少部分旁路光反射出于棱镜12外，既可以对透过分光元件13的激发光进行充分利用，光学处理元件17的配置又非常简单。
其中，反射片的反射率可以根据要求调整。可选地，反射片的反射率为50％、60％、70％、80％或90％等。
总而言之，在本实施方式中，入射光经由棱镜12的入光面传递至设置在入光面121和功能面122之间的分光元件13，入射光在棱镜12中传播时角分布不会改变，可以减小分光元件13的面积，从而减小扩展量的稀释，提高光源效率。
另外，棱镜12还可包括连接入光面121和功能面122的侧面。并且，棱镜12的入光面121、功能面122和侧面可均为光学平面。
其中，侧面的数量可以根据具体情况进行调节。优选地，棱镜12包括至少四个侧面。更为优选地，棱镜12包括四个侧面。最为优选地，棱镜12呈长方体。
其中，至少一组相对的侧面相互平行。这样光垂直射入棱镜12的一侧面，可以经棱镜12与侧面平行相对的另一侧面垂直出射，可以使光在棱镜12中传播的距离尽量一致，可以提高经过棱镜12传播的光的均匀性，同时由于垂直出射未造成光学扩展量的进一步增加，便于后续光学元件对光束的收集利用。更为优选地，所有组相对的侧面相互平行。
可选地，相邻的两个侧面还可以相互垂直。
并且，侧面可分别与入光面和功能面垂直。
在另一方面，本申请提供一发光装置。如图3所示，发光装置1包括光源11、上述实施方式的棱镜组件10和波长转换装置14。光源11用于发射激发光。棱镜12的入光面一侧配置有光源11。棱镜12内设置有分光元件13。光源11的激发光经由棱镜12的入光面传递至棱镜12中设置的分光元件13，分光元件13用于将至少部分激发光发射至波长转换装置14，波长转换装置14用于吸收激发光并受激发射出向棱镜12传播的受激光。
光源11用于发射激发光。光源11可以是包括一种发光颜色的激光光源。光源11发射出的激发光经由波长转换装置14吸收并激发产生受激光，激发光和受激光合光可以形成第一出射光。其中，受激光可以包括至少两种颜色的光或至少两种颜色光的复合光，以让受激光和激发光 可以合光形成白色出射光。
示例性地，光源11可以是由若干个蓝色激光器组成的蓝色激光光源阵列，蓝色激发光经由波长转换装置14吸收并激发产生绿色受激光和红色受激光，绿色受激光和红色受激光、蓝色激发光可以合光形成白色出射光。可以理解的是，光源11可以不限于蓝色光源，也可以是紫色光源、红色光源或绿色光源等。
在本实施例中，光源11发出的激发光经由棱镜12的入光面传递至棱镜12中部设置的分光元件13，激发光在棱镜12中传播时角分布不会改变，可以减小分光元件13的面积，从而减小受激光进入后续光学系统的距离，减小扩展量的稀释，提高光源效率。
具体地，棱镜12中间可设置有一斜面，整个斜面上镀有分光膜，以形成分光元件13。可选地，该斜面可呈45°倾角设置。当然斜面的设置角度不限于此，具体可以根据光源11和波长转换装置14的设置位置来确定。
可选地，分光元件13可以为偏振分光元件。其中偏振分光元件用于将第一偏振态的所述激发光反射至波长转换装置，将第二偏振态的所述激发光透射形成所述旁路光并照射至所述光学处理元件，这样防止受激光被分光元件13偏振分光导致受激光无法全部透过分光元件13。
可选地，分光元件13可以为波长分光元件。其中波长分光元件可以仅对与激发光发光颜色或发光波长相同的光具有波长分光特性，这样防止受激光被分光元件13波长分光导致受激光无法全部透过分光元件13。例如，在其他实现方式中，分光元件13可以为反射片。其中反射片可以仅对与激发光发光颜色或发光波长相同的光具有反射分光特性，这样防止受激光被分光元件13反射分光导致受激光无法全部透过分光元件13。
分光元件13用于将至少部分激发光反射至波长转换装置14。
波长转换装置14会吸收激发光并产生向棱镜12传播的受激光。
波长转换装置14可以为圆形、方型或其他形状，在此不做限制。本实施例以圆形为例进行说明。
波长转换装置14可以包括转换区、非转换区及设置于波长转换装置14底部的驱动装置。转换区与非转换区在驱动单元的作用下交替位于光源11发出的激发光所在的光路上。
转换区与非转换区可以分别位于同一圆环的部分区域，相互拼接后形成中心带有通孔的圆环状。
转换区和非转换区可以是连续设置的，或者是间断设置的。
为了让转换区能够实现吸收激发光并激发产生受激光的功能，转换区上可以设置至少一种波长转换材料，以在激发光的激发下产生至少一种颜色的受激光。
其中，波长转换材料可以为荧光粉、量子点材料和磷光材料。
另外，可以根据激发光的颜色设定波长转换材料的发光颜色，以让激发光和波长转换装置14发出的至少一种颜色的受激光可以合光形成白色出射光。
例如，在激发光的颜色为蓝色时，波长转换材料的发光颜色为黄绿色。或者，激发光的颜色为蓝色时，波长转换材料的发光颜色为红色和绿色。可以理解的是，除红色和绿色、黄绿色外，波长转换材料的发光颜色还可以是其他颜色，在此不做限制。
可以理解的是，为了便于设置波长转换装置14，在波长转换材料的发光颜色的数量为至少两种时，转换区可以分为至少两个子转换区，每一种波长转换材料一一对应地设置在每一个子转换区上。例如，设置在波长转换装置14上的波长转换材料包括红色波长转化材料和绿色波长转换材料，转换区也相应分为第一子转换区和第二子转换区，红色波长转换材料设置在第一子转换区上，绿色波长转换材料设置在第二子转换区上。
其中，子转换区可以是连续设置的，或者可以是不连续设置的。
另外，不同的子转换区的面积可相等，或可不相等。
在本实施例中，波长转换装置14的结构如图4所示，波长转换装置14的横截面呈圆形，第一子转换区141、第二子转换区142和非转换区143均呈连续分布的圆弧区域，且各圆弧区域的圆心均为波长转换装 置14的旋转中心，第一子转换区141、第二子转换区142和非转换区143的圆心角半径之和为360度。
进一步地，为了提高射入到棱镜12入光面的光斑的均匀性，发光装置1还可以包括设置于光源11和棱镜12之间的匀光装置16。匀光装置16用于将光源11发射的激发光的角分布整形，以产生均匀分布的光斑。可选地，匀光装置16为双复眼或匀光棒，并不以此为限。
进一步地，匀光装置16的出光面紧贴着棱镜12的入光面，或者直接贴合到棱镜12的入光面上，并且棱镜12的入光面的面积与匀光装置16发出的光斑大小相匹配，这样可以使棱镜12中分光元件13的面积达到最小，从而进一步减小第一出射光进入后续光学系统的距离，并且可以减小第一出射光过棱镜12时被分光元件13反射的光的量，进一步提高光源效率。
本申请发明人发现，第一出射光到达分光元件13区域时，受激光和一部分激发光透过分光元件13，另一部分激发光会被分光元件13反射走，这样有一部分激发光无法透过分光元件13，从而导致离开分光元件13区域的出射光的颜色与预设颜色不相符，即离开分光元件13区域的第一出射光存在颜色不均匀的现象。例如，激发光为蓝光时，一部分蓝光无法透过分光元件13，导致离开分光元件13区域的第一出射光的发光颜色偏黄。第一出射光到达分光元件13以外区域时，受激光和激发光都可以透过，不会被反射出去。因为分光元件13的作用导致只有分光元件13区域会将一部分激发光反射走，从而分别从分光元件13区域和分光元件13以外的区域离开的第一出射光的发光颜色不一致，使得离开棱镜12区域的第一出射光存在颜色不均匀的现象，进而会导致最终投影出来的画面颜色不均匀。
为解决上述离开棱镜12区域的第一出射光存在颜色不均匀的问题，本申请的棱镜组件进一步包括光学处理元件17，光学处理元件17用于对从光源11发射出并透过分光元件13的激发光进行处理后并返回到分光元件13，以让分光元件13将这部分光反射并形成第二出射光，第一出射光可与第二出射光组合出射，既可以利用透过分光元件13的激发 光，又可以通过第二出射光减弱发光装置1发出的光的颜色不均匀的问题，提高光源效率。
其中，光学处理元件17设置于棱镜12的功能面上。并且分光元件13位于光学处理元件17和入光面之间。这样分光元件13将部分激发光反射至波长转换装置14，并透过剩余部分激发光以形成旁路光并照射至光学处理元件17时，光学处理元件17可以对旁路光进行处理后返回到分光元件13，经分光元件13反射形成第二出射光，用以减弱发光装置1发出的光颜色不均匀的问题，提高光源效率。
为对透过分光元件13的激发光进行充分利用，可以基于分光元件13的分光原理合理调整光学处理元件17的配置。
在本申请另一实现方式中，分光元件13为偏振分光元件，由于光源11发出的激发光偏振态可能存在着不纯的问题，激发光中的部分光可能会透过分光元件13，造成光能损失，光源效率降低。利用光学处理元件17可以改变透过分光元件13的激发光的偏振态，以让偏振态改变后的光能被分光元件13反射出去并形成第二出射光，提高了光源效率。具体地，如图5所示，光学处理元件17可以包括反射镜171和1/4波片172，1/4波片172位于反射镜171和分光元件13之间，1/4波片172和反射镜171配合用于改变旁路光的偏振方向，以让改变偏振方向后的旁路光能被分光元件13反射形成第二出射光。
其中，分光元件13可以为反p激发光透s激发光偏振分光元件或反s激发光透p激发光偏振分光元件。
示例性地，激发光为蓝光，分光元件13为反s偏振蓝光透p偏振蓝光偏振分光元件，p蓝光在第一次过1/4波片172时会被转为圆偏光，被反射镜171反射后会再次过1/4波片172，此时，圆偏光会被转化为s蓝光，并随原光路入射至分光元件13，被分光元件13反射形成第二出射光，这样就可以将从分光元件13透过的p蓝光转化为s蓝光并返回到分光元件13，以对从分光元件13透过的p蓝光进行充分利用。
另外，在分光元件13为偏振分光元件时，为保证分光元件13至少将光源11发出的大部分激发光反射至波长转换装置14，光源11发出的 大部分激发光的偏振方向与分光元件13反射的光的偏振方向相同。例如，光源11发出的激发光至少大部分为s光，那分光元件13能够反射s激发光，透射p激发光。
在另一实现方式中，分光元件13为波长分光元件，进一步的，分光元件13可以为反射片。光学处理元件17可以只包括反射镜171。这样反射镜171就可以将旁路光反射到分光元件13上，分光元件13可以将至少部分旁路光反射出并形成第二出射光，既可以对透过分光元件13的激发光进行充分利用，光学处理元件17的配置又非常简单。
其中，反射片的反射率可以根据要求调整。可选地，反射片的反射率为50％、60％、70％、80％或90％等。
进一步地，发光装置1还可包括位于匀光装置16和光源11之间的第一收集装置18，第一收集装置18用于将激发光聚集后射入匀光装置16，可以压缩光斑大小，可以进一步减小分光元件13的面积，减小第一出射光进入后续光学系统的距离，提高光源效率。可选地，第一收集装置18可以为正负透镜组。
另外，发光装置1还可包括位于分光元件13和波长转换装置14之间的第二收集装置19，用于将分光元件13反射出的激发光做面角变化后，成像于波长转换装置14上，再将经波长转换装置14形成的第一出射光会聚后射出。
可选地，第二收集装置19可以为收集透镜。第二收集装置19可以紧贴于棱镜12的侧面，并且由于分光元件13的面积相对较小，这样会减小第二收集装置19发出的光进入后续光学系统的距离，使得射入后续光学系统的光斑减小，从而减小panel处的立体角大小，提高系统过镜头的效率。
另外，第二收集装置19射出的光可以垂直射入棱镜12的一侧面，并将棱镜12的另一侧面射出；并且棱镜12的一侧面和棱镜12的另一侧面相互平行，这样第二收集装置19射出的光在棱镜12中传播的距离可以尽量一致，使得发光装置1发出的光的均匀性更高。
以上为本申请提供的发光装置1的实施例，本申请还提供了一种投 影系统，该投影系统包括发光装置1，该发光装置1为上述任意一种实施例提供的发光装置1，具有相应的技术特征和技术效果，在此不再赘述。
综上，光源11发出的激发光经由棱镜12的入光面传递至棱镜12中部设置的分光元件13，分光元件13将至少部分激发光反射至波长转换装置14，波长转换装置14会吸收激发光并产生向棱镜12传播的受激光，激发光在棱镜12中传播时角分布不会改变，可以减小分光元件13的面积，从而减小受激光进入后续光学系统的距离，减小扩展量的稀释，提高光源效率。
以上仅为本申请的实施方式，并非因此限制本申请的专利范围，凡是利用本申请说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本申请的专利保护范围内。

Claims (10)

  1. 一种棱镜组件，其特征在于，所述棱镜组件包括一棱镜，所述棱镜包括入光面、与入光面相对的功能面以及设置在所述入光面与功能面之间的分光元件；
    其中，入射光经由所述入光面传递至所述分光元件，所述分光元件用于将至少部分所述入射光反射出于所述棱镜外，其余入射光透射所述分光元件后到达所述功能面。
  2. 根据权利要求1所述的棱镜组件，其特征在于，所述棱镜组件还包括设置在所述功能面上的光学处理元件；
    所述分光元件用于将部分所述入射光反射出于所述棱镜外，并将剩余部分所述入射光透过以形成旁路光并照射至所述光学处理元件；所述旁路光经由所述光学处理元件进行处理后返回到所述分光元件，再经所述分光元件反射出于所述棱镜外。
  3. 根据权利要求2所述的棱镜组件，其特征在于，所述光学处理元件包括反射镜。
  4. 根据权利要求2所述的棱镜组件，其特征在于，所述分光元件为偏振分光元件，所述偏振分光元件用于反射第一偏振态的入射光，透射第二偏振态的入射光以形成所述旁路光并照射至所述光学处理元件；
    所述光学处理元件包括反射镜和1/4波片，所述1/4波片位于所述反射镜和所述偏振分光元件之间，所述1/4波片和所述反射镜配合用于改变所述旁路光的偏振方向，以让改变偏振方向后的旁路光能被所述偏振分光元件反射出于所述棱镜外。
  5. 根据权利要求1所述的棱镜组件，其特征在于，
    所述棱镜包括连接所述入光面和所述功能面的四个侧面，所述四个侧面分别与所述入光面和所述功能面垂直，且至少一组相对的侧面相互平行。
  6. 一种发光装置，其特征在于，所述发光装置包括：
    光源，用于发射激发光；
    棱镜组件，所述棱镜组件包括一棱镜，所述棱镜包括入光面、与入光面相对的功能面以及设置在所述入光面与功能面之间的分光元件，所述入光面一侧配置有所述光源；
    波长转换装置，用于吸收所述激发光并受激发射出向所述棱镜传播的受激光；
    其中，所述光源的激发光经由所述棱镜的入光面传递至棱镜中设置的分光元件，所述分光元件用于将至少部分所述激发光发射至波长转换装置，其余激发光透射所述分光元件后到达所述功能面。
  7. 根据权利要求6所述的发光装置，其特征在于，所述发光装置还包括匀光装置；
    所述匀光装置设置在所述光源和所述棱镜之间，所述匀光装置的出光面紧贴着所述棱镜的入光面；所述棱镜的入光面面积与所述匀光装置出射光斑的大小相匹配。
  8. 根据权利要求6所述的发光装置，其特征在于，所述棱镜组件还包括设置在所述功能面上的光学处理元件，所述分光元件位于所述光学处理装置和所述入光面之间；
    所述分光元件用于将部分所述激发光反射至所述波长转换装置，并将剩余部分所述激发光透过以形成旁路光并照射至所述光学处理元件；所述旁路光经由所述光学处理元件进行处理后返回到所述分光元件，经所述分光元件反射形成第二出射光。
  9. 根据权利要求8所述的发光装置，其特征在于，所述分光元件为偏振分光元件，所述偏振分光元件用于将第一偏振态的所述激发光反射至波长转换装置，将第二偏振态的所述激发光透射形成所述旁路光并照射至所述光学处理元件；
    所述光学处理装置包括反射镜和1/4波片，所述1/4波片位于所述反射镜和所述偏振分光元件之间，所述1/4波片和所述反射镜配合用于改变所述旁路光的偏振方向，以让改变偏振方向后的旁路光能被所述偏振分光元件反射形成第二出射光。
  10. 一种投影系统，其特征在于，所述投影系统包括权利要求1-5 任一项所述的棱镜组件和/或权利要求6-9中任一项所述的发光装置。
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