WO2022143318A1

WO2022143318A1 - Light emitting device

Info

Publication number: WO2022143318A1
Application number: PCT/CN2021/140269
Authority: WO
Inventors: 万民
Original assignee: 万民
Priority date: 2020-12-31
Filing date: 2021-12-22
Publication date: 2022-07-07
Also published as: CN112815273A; CN214501113U

Abstract

The present invention provides a light emitting device, comprising a first light source, a second light source, a dichroic mirror, a wavelength conversion apparatus, a first light path adjusting apparatus or a second light path adjusting apparatus, and a first scattering optical system. In the present invention, the light mixing effect of emergent light can be improved by using the first scattering optical system. The color temperature of the emergent light of the light emitting device can be freely adjusted by independently adjusting the power of the first light source and the power of the second light source. A laser capable of emitting light of different dominant wavelengths can be used in the second light source to improve the color rendering index of the emergent light of the light emitting device. Light emitted by the first light source in the present invention is all used for exciting the wavelength conversion apparatus. Compared with existing technical solutions, the light emitting device provided by the present invention can achieve output of higher light flux in the case that an optical expansion amount is not increased, and if a polarization selection element is used in the first light source in a matching mode, the output of light flux of the light emitting device can be further improved.

Description

a light-emitting device

technical field

The invention belongs to the field of lighting, in particular to the field of solid-state light source lighting. The light-emitting device provided by the present invention can be applied to systems requiring high light intensity and small etendue, such as entertainment lighting systems, projection systems, automotive lighting systems, medical lighting systems, search lighting systems, field work lighting systems, Nautical lighting systems, portable lighting systems, etc.

Background technique

As an ideal point light source, laser has the advantages of small etendue, long life and no mercury. Using it as a light source, exciting fluorescent materials can get colored light or white light. At the same time, with the use of optical components, an ideal laser with a small amount of light can be obtained. Optical etendue light-emitting device.

FIG. 1 is a schematic structural diagram of a conventional light-emitting device using a dichroic mirror. As shown in FIG. 1, an existing light-emitting device using a dichroic mirror includes a light source 101, a light source 102, a dichroic mirror 103, a lens group 104 (including a lens 104a and a lens 104b), a wavelength conversion device 105 (including a reflective layer) 105a and wavelength conversion layer 105b), transmissive diffuser 106, collimating lens 107 and focusing lens 108. The light source 101 includes a plurality of lasers 101a and a plurality of collimating lenses 101b corresponding to the plurality of lasers 101a one-to-one, the laser 101a emits blue light, and the light source 102 includes a plurality of lasers 102a and a plurality of lasers 102a one-to-one Corresponding to several collimating lenses 102b, the laser 102a also emits blue light.

The characteristic of the dichroic mirror 103 is to transmit blue light and reflect yellow light. The blue light emitted from the light source 101 is transmitted through the dichroic mirror 103 and then directed to the lens group 104. The lens group 104 converges the blue light from the dichroic mirror 103 towards the wavelength conversion device 105. The wavelength conversion device 105 is reflective and includes a reflective layer. 105a and the wavelength conversion layer 105b (for example, a yellow phosphor layer) disposed on the reflective layer 105a, the wavelength conversion device 105 converts the incident blue light into yellow light and sends it to the lens group 104, and the yellow light is collected by the lens group 104 and then emitted. To the dichroic mirror 103, the dichroic mirror 103 reflects the yellow light. The blue light emitted from the light source 102 is directed to the transmissive diffuser 106, and the transmissive diffuser 106 makes it homogenized and then goes to the collimating lens 107, and the blue light collimated by the collimating lens 107 goes to the dichroic mirror 103, the dichroic Mirror 103 makes it transmissive. The yellow light reflected by the dichroic mirror 103 and the blue light transmitted through the dichroic mirror 103 are combined into a mixed light, and the mixed light of the yellow light and the blue light is white light. out.

The disadvantage of the solution shown in FIG. 1 is that the transmissive diffuser 106 cannot well uniform the blue light emitted by the light source 102 , and the light distribution of the blue light uniformed by the transmissive diffuser 106 is different from the light emitted by the wavelength conversion device 105 . It is difficult to completely match the light distribution of the yellow light, so that the light mixing effect of the blue light and the yellow light in the outgoing light of the light-emitting device is not good.

FIG. 2 is a schematic structural diagram of an existing light-emitting device using a polarization beam splitter. As shown in FIG. 2, the existing light-emitting device includes a light source 201, a quarter-wave plate 202, a polarizing beam splitter 203, a lens group 204 (including a lens 204a and a lens 204b), a wavelength conversion device 205 (including a reflective layer 205a and a wavelength conversion layer 205b), quarter wave plate 206, lens group 207 (including lens 207a and lens 207b), reflective diffusing plate 208, and focusing lens 209. The light source 201 includes a plurality of lasers 201a and a plurality of collimating lenses 201b corresponding to the plurality of lasers 201a one-to-one, and the lasers 201a emit blue light of S-polarized light.

The characteristic of the polarizing beam splitter 203 is to reflect blue light of S-polarized light and transmit blue light of P-polarized light, while the polarizing beam splitter 203 also transmits yellow light. The blue light of the S-polarized light emitted by the light source 201 is transmitted through the quarter-wave plate 202 and converted into blue light formed by mixing the S-polarized light component and the P-polarized light component according to a prescribed ratio, and then incident on the polarization beam splitter 203, The polarizing beam splitter 203 separates the blue light of the S-polarized light and the blue light of the P-polarized light, and reflects the blue light of the S-polarized light therein and transmits the blue light of the P-polarized light therein. The blue light of the S-polarized light reflected by the polarizing beam splitter 203 is directed to the lens group 204 , and the blue light of the P-polarized light transmitted through the polarizing beam splitter 203 is directed to the quarter-wave plate 206 . The lens group 204 converges the blue light of the S-polarized light toward the wavelength conversion device 205. The wavelength conversion device 205 is reflective and includes a reflective layer 205a and a wavelength conversion layer 205b (eg, a yellow phosphor layer) disposed on the reflective layer 205a, The wavelength conversion device 205 converts the blue light of the S-polarized light into yellow light and sends it to the lens group 204. The yellow light is collected by the lens group 204 and then sent to the polarization beam splitter 203, and the polarization beam splitter 203 transmits the yellow light. The blue light of the P-polarized light is transmitted through the quarter-wave plate 206 and then converted into blue light of circularly polarized light. The lens group 207 converges the blue light of the circularly polarized light toward the reflective scattering plate 208, and the blue light of the circularly polarized light is reflectively scattered. After reflection by the plate 208, it is directed to the lens group 207, and then collected by the lens group 207 and then directed to the quarter-wave plate 206. The blue light of circularly polarized light is transmitted through the quarter-wave plate 206 and converted into blue light of S-polarized light. , the blue light of the S-polarized light is directed to the polarization beam splitter 203, and the polarization beam splitter 203 reflects the blue light of the S-polarized light. The yellow light transmitted through the polarizing beam splitter 203 and the blue light of the S-polarized light reflected by the polarizing beam splitter 203 are combined into one mixed light, and the mixed light of the yellow light and the blue light is white light. The luminaire exits.

The scheme shown in Figure 2 has the following shortcomings:

First, in the solution shown in FIG. 2 , the blue light of the S-polarized light emitted by the light source 201 is transmitted through the quarter-wave plate 202 and converted into a mixture of the S-polarized light component and the P-polarized light component according to a prescribed ratio. The ratio of the S-polarized light component and the P-polarized light component will determine the ratio of blue light and yellow light in the outgoing light of the light-emitting device, thereby determining the color temperature of the outgoing light of the entire light-emitting device, but this structure cannot realize the outgoing light. The color temperature is adjustable. On the basis of this structure, the ratio of the S-polarized light component and the P-polarized light component can be changed by rotating the quarter-wave plate 202, so that the color temperature of the light emitted from the light-emitting device can be adjusted. The adjustment of yellow light is not independent of each other. Increasing or decreasing the proportion of blue light will directly affect the output of the luminous flux of the yellow light. Therefore, in the process of adjusting the color temperature, it will affect the output of the luminous flux of the light-emitting device.

Second, in the solution shown in FIG. 2 , part of the blue light emitted by the light source 201 is converted into yellow light by the wavelength conversion device 205 , and the remaining blue light and yellow light are mixed to form white light. The wavelength conversion device 205 includes a reflective layer 205a and a wavelength conversion layer 205b (eg, a yellow phosphor layer) disposed on the reflective layer 205a. The yellow phosphor emits yellow light after being excited by blue light. Select a laser that can emit light in the wavelength band that is most likely to excite yellow phosphors to get as much yellow light as possible, such as selecting a blue laser with a dominant wavelength of 455nm, but the spectrum of the blue wavelength band in the synthesized white light will be Very narrow, because the main component of the blue light band at this time is 455nm monochromatic light, so the color rendering index of the emitted light of the light-emitting device is generally relatively low.

Third, in the solution shown in FIG. 2, if the output of the luminous flux of the light-emitting device needs to be significantly improved, the number of lasers 201a needs to be increased in the light source 201, but this will increase the etendue of the entire light-emitting device, thereby increasing the number of lasers 201a. It cannot meet some applications that require small etendue, such as entertainment lighting systems, projection systems, etc.

SUMMARY OF THE INVENTION

The technical problems to be solved by the present invention are: first) the light mixing effect of the outgoing light of the existing light-emitting devices using dichroic mirrors is not good; During the process, the output of the luminous flux will be affected; 3) the color rendering index of the outgoing light of the existing light-emitting device using the polarization beam splitter is low; 4) if the output of the luminous flux of the light-emitting device needs to be significantly improved, the existing light-emitting device will be reduced. The etendue of some light-emitting devices using polarizing beam splitters becomes larger.

In order to solve the above technical problems, a technical solution of the present invention is to provide a light-emitting device, which is characterized by comprising a first light source, a second light source, a dichroic mirror, a wavelength conversion device, a first optical path adjustment device, and a first light source. Scattering optics, where:

the first light source is used for emitting light of the first wavelength band;

the second light source is used for emitting light in a second wavelength band, and the second wavelength band is the same as or different from the first wavelength band;

The dichroic mirror receives the light of the first wavelength band emitted by the first light source, and transmits or reflects it;

When the dichroic mirror transmits the light of the first wavelength band emitted by the first light source, the wavelength conversion device receives the light of the first wavelength band transmitted through the dichroic mirror, and converts it into converting into light of a third wavelength band different from the first wavelength band and the second wavelength band; the dichroic mirror reflects the light of the third wavelength band from the wavelength conversion device; passing through the dichroic mirror The light of the third wavelength band reflected by the color mirror is directed to the first optical path adjusting device;

When the dichroic mirror reflects the light of the first wavelength band emitted by the first light source, the wavelength conversion device receives the light of the first wavelength band reflected from the dichroic mirror, converting it into light of a third wavelength band different from both the first wavelength band and the second wavelength band; the dichroic mirror transmits the light of the third wavelength band from the wavelength conversion device; the light of the third wavelength band of the dichroic mirror is directed to the first optical path adjusting device;

The first optical path adjusting device receives the light of the second wavelength band emitted by the second light source, and makes it at least partially transmit or at least partially reflect;

When the light of the second wavelength band emitted by the second light source is at least partially transmitted by the first optical path adjustment device, the first scattering optical system receives the second light transmitted through the first optical path adjustment device the light of the second wavelength band, which is reflected to form scattered light of the second wavelength band; the first optical path adjusting device reflects at least part of the light of the second wavelength band from the first scattering optical system; the first An optical path adjusting device transmits the light of the third wavelength band from the dichroic mirror;

When the light of the second wavelength band emitted by the second light source is at least partially reflected by the first optical path adjustment device, the first scattering optical system receives the reflected light from the first optical path adjustment device The light of the second wavelength band is reflected to form scattered light of the second wavelength band; the first optical path adjusting device transmits at least part of the light of the second wavelength band from the first scattering optical system; the The first optical path adjusting device reflects the light of the third wavelength band from the dichroic mirror.

In the above technical solution, the wavelength conversion device is reflective, which can be static or dynamic:

The static wavelength conversion device includes a reflective layer and a wavelength conversion layer disposed on the reflective layer, wherein the wavelength conversion layer absorbs the incident light in the first wavelength band and emits light in the third wavelength band after being excited.

The dynamic wavelength conversion device is a rotatable fluorescent wheel, which includes a reflection layer and a wavelength conversion layer arranged on the reflection layer, wherein the wavelength conversion layer absorbs the incident light in the first wavelength band and emits light in the third wavelength band after being excited .

It should be noted that, for example, two or more different wavelength conversion layers are provided on the reflective layers of different sectors of the fluorescent wheel, and each wavelength conversion layer absorbs the incident light of the first wavelength band and emits different wavelength bands after being excited. At this time, the combined light of these different wavelength bands should be regarded as the light of the third band.

In the above technical solution, the dichroic mirror can reflect the light of the first wavelength band with a certain polarization direction and transmit the light of the first wavelength band with another polarization direction. At this time, the polarization state and/or polarization direction of the light emitted by the first light source and directed to the first wavelength band of the dichroic mirror will affect the role played by the dichroic mirror in the optical path (for example, reflecting the first wavelength of light) The light of the wavelength band still transmits the light of the first wavelength band), at this time, the dichroic mirror can also be called a polarizing beam splitter. The dichroic mirror can also reflect or transmit light of the first wavelength band with any polarization state and/or any polarization direction. At this time, the polarization state and/or polarization direction of the light emitted by the first light source and directed towards the first wavelength band of the dichroic mirror will not affect the function of the dichroic mirror in the optical path (for example, it is a reflection of the The light of one wavelength band still transmits the light of the first wavelength band).

The dichroic mirror may be a flat-type dichroic mirror or a cube-type dichroic mirror.

Preferably, the first optical path adjusting device is a first polarization beam splitter, and the first polarization beam splitter has the following first characteristic with respect to the incident light of the second wavelength band: reflecting the second polarization beam having a first polarization direction the linearly polarized light of the wavelength band and transmit the linearly polarized light of the second wavelength band having a second polarization direction, wherein the first polarization direction is different from the second polarization direction; the first polarization beam splitter is related to the The incident light of the third wavelength band has the second characteristic of transmitting or reflecting the light of the third wavelength band.

In the above technical solution, the first polarization beam splitter is a flat plate type polarization beam splitter or a cube type polarization beam splitter.

Preferably, it also includes a polarization conversion element, the polarization conversion element is located on the optical path between the first optical path adjustment device and the first scattering optical system, and is used to make the light emitted from the first optical path adjustment device to the When the light of the second wavelength band of the first scattering optical system is reflected by the first scattering optical system and returns to the first optical path adjusting device, its polarization direction or polarization state is changed.

Preferably, the polarization conversion element is a first quarter wave plate.

Preferably, the first light source includes N first lasers and N first collimating elements corresponding to the N first lasers, N≥1, where:

the first laser is used for emitting light in the first wavelength band;

The first collimating element is integrated in the first laser or disposed outside the first laser, and is used for collimating the light of the first wavelength band emitted by the first laser.

In the above technical solution, the first collimating element can be integrated inside the first laser, and when the first laser used is not integrated with the first collimating element, the first collimating element can also be added outside the first laser (eg: collimating lens), used for collimating the light emitted by the first laser.

In addition to the first laser and the first collimating element indicated in the above technical solution, the first light source may also contain other optical elements (such as a mirror), and these optical elements can be used to collect the light emitted from the first laser, and finally A first wavelength band of light emitted by the first light source is formed.

Preferably, the first light source further includes a polarization selection element, and the polarization selection element is characterized to reflect the S-polarized light of the first wavelength band and transmit the P-polarized light of the first wavelength band. At least one of the first lasers in the light source is used to emit the S-polarized light of the first wavelength band to form incident light 1, and the remaining first lasers in the first light source are used to emit the P of the first wavelength band The polarized light forms incident light 2, and the polarization selection element combines the incident light 1 and the incident light 2 into one light and then emits it.

Preferably, the second light source includes M second lasers and M second collimating elements corresponding to the M second lasers one-to-one, where M≥1, where:

the second laser is used for emitting light in the second wavelength band;

The second collimating element is integrated in the second laser or disposed outside the second laser, and is used for collimating the light of the second wavelength band emitted by the second laser.

In the above technical solution, the second collimating element can be integrated inside the second laser, and when the second laser used is not integrated with the second collimating element, a second collimating element can also be added outside the second laser (eg: collimating lens), used for collimating the light emitted by the second laser.

In addition to the second laser and the second collimating element indicated in the above technical solution, the second light source may also contain other optical elements (such as: mirrors), and these optical elements can be used to collect the light emitted from the second laser, and finally A second wavelength band of light emitted by the second light source is formed.

Preferably, the first scattering optical system is composed of a first reflective scattering plate, or a first transmissive scattering plate and a first reflecting mirror.

In the above technical solution, the first reflective diffuser plate may be static or a dynamic rotatable first reflective diffuser plate.

Preferably, a first collection optical system is also included, and the first collection optical system is located on the optical path between the dichroic mirror and the wavelength conversion device, and is used to convert the light from the dichroic mirror. The light of the first wavelength band is converged towards the wavelength conversion device, and at the same time, the light of the third wavelength band from the wavelength conversion device is collected and directed toward the dichroic mirror.

In the above technical solution, the first collection optical system may be composed of a lens, a lens group, a compound parabolic concentrator or a tapered light guide column alone, or may be composed of any combination of the above-mentioned optical elements.

Preferably, it also includes a second collection optical system, the second collection optical system is located on the optical path between the first optical path adjustment device and the first scattering optical system, and is used for adjusting the optical path from the first optical path. The light of the second wavelength band of the device is converged toward the first scattering optical system, and at the same time, the light of the second wavelength band from the first scattering optical system is collected and directed to the first optical path adjustment device.

In the above technical solution, the second collection optical system may be composed of a lens, a lens group, a compound parabolic concentrator or a tapered light guide column alone, or may be composed of any combination of the above-mentioned optical elements.

Preferably, it also includes a first uniform light optical system, the first uniform light optical system is located on the optical path from the first light source to the dichroic mirror, and is used to uniformly emit the light emitted by the first light source. light in the first wavelength band.

In the above technical solution, the first uniform light optical system may be composed of a diffuser, an optical integrator or at least one fly-eye lens array, wherein the optical integrator may be solid or hollow. In addition, since the use of the diffuser will diffuse the light of the first wavelength band emitted by the first light source, a positive beam can be arranged on the light path from the first light source to the diffuser or on the light path from the diffuser to the dichroic mirror. The lens is used for converging the light of the first wavelength band emitted from the first light source to the dichroic mirror.

Preferably, it also includes a second uniform light optical system, the second uniform light optical system is located on the optical path from the second light source to the first light path adjustment device, and is used for uniform light emitted by the second light source. the light of the second wavelength band.

In the above technical solution, the second uniform light optical system may be composed of a diffuser, an optical integrator or at least one fly-eye lens array, wherein the optical integrator may be solid or hollow. In addition, since the use of the diffusing sheet will diffuse the light of the second wavelength band emitted by the second light source, a light path from the second light source to the diffusing sheet or the light path from the diffusing sheet to the first optical path adjusting device can be provided with a diffusing sheet. The positive lens is used for converging the light of the second wavelength band emitted from the second light source to the first optical path adjusting device.

Preferably, a condensing optical system is also included for condensing the light emitted from the first optical path adjusting device.

In the above technical solution, the condensing optical system may be composed of one or more lenses.

Preferably, a first lens group is also included, the first lens group is located on the optical path from the first light source to the dichroic mirror, and is used for reducing the first wavelength band emitted by the first light source beams of light.

Preferably, a second lens group is also included, the second lens group is located on the light path from the second light source to the first light path adjusting device, and is used for reducing the second light source emitted by the second light source. A beam of light in a wavelength band.

Preferably, a reflective element is further included, the reflective element is located on the optical path between the second light source and the first optical path adjusting device, the reflective element has a transmission area and a reflection area, the transmission area allows the The light of the second wavelength band passes through or is transmitted, and the reflection area is used for reflecting the light of the second wavelength band from the first optical path adjusting device, and at least part of the light is reflected back to the first optical path adjusting device .

In the above technical solutions, the reflective element may be planar or non-planar. The transmission area of the reflective element may be a light-transmitting hole or a light-transmitting structure composed of a light-transmitting material. The reflective element can also be a transmissive diffuser plate coated with a reflective film on a part of the area, wherein the area on the transmissive diffuser plate that is not coated with the reflective film is the transmissive area, and the area on the transmissive diffuser plate with the reflective film is the reflective area .

Preferably, a light guide optical system is also included, the light guide optical system is located on the light path from the second light source to the first light path adjusting device, and is used to guide the light emitted from the second light source at least in part. The light of the second wavelength band passes through or transmits through the transmission region of the reflection element and then enters the first optical path adjusting device.

In the above technical solution, the light guiding optical system may be constituted by a lens, a compound parabolic concentrator or a light guiding column alone, or may be constituted by any combination of the above-mentioned optical elements. In addition, the number of lenses, compound parabolic concentrators, and light guide rods can be determined according to requirements, which may be one, or two or more. The light guide rod may be solid or hollow, and the end face of the light guide rod may be flat or non-planar.

Preferably, it further includes a second scattering optical system, the first optical path adjusting device allows the light of the second wavelength band emitted by the second light source to be partially transmitted and partially reflected and then emitted from different optical paths, the first scattering optical system The optical system receives the light of the second wavelength band emitted from one of the optical paths, and the dichroic mirror receives the light of the second wavelength band emitted from the other optical path, and transmits or reflects it to the second wavelength. a scattering optical system that reflects and forms scattered light of the second wavelength band; the dichroic mirror reflects the light of the second wavelength band from the second scattering optical system Or after transmission, it is directed to the first optical path adjusting device, and the first optical path adjusting device makes it transmit or reflect.

Preferably, the second scattering optical system is composed of a second reflective scattering plate, or a second transmissive scattering plate and a second reflecting mirror.

In the above technical solution, the second reflective diffuser plate may be static or a dynamic rotatable second reflective diffuser plate.

Preferably, a third collection optical system is also included, and the third collection optical system is located on the optical path between the dichroic mirror and the second scattering optical system, and is used to combine the light from the dichroic mirror. The light of the second wavelength band is condensed toward the second scattering optical system, and at the same time, the light of the second wavelength band is collected from the second scattering optical system and directed to the dichroic mirror.

In the above technical solution, the third collection optical system may be composed of a lens, a lens group, a compound parabolic concentrator or a tapered light guide column alone, or may be composed of any combination of the above-mentioned optical elements.

Preferably, a second quarter-wave plate is also included, the second quarter-wave plate is located on the optical path between the dichroic mirror and the second scattering optical system.

Another technical solution of the present invention is to provide a light-emitting device, which is characterized by comprising a first light source, a second light source, a dichroic mirror, a wavelength conversion device, a second optical path adjustment device, and a first scattering optical system, wherein :

the first light source is used for emitting light of the first wavelength band;

The second light path adjusting device receives the light of the second wavelength band emitted by the second light source, and makes it at least partially transmit or at least partially reflect;

When the second optical path adjusting device at least partially transmits the light of the second wavelength band emitted by the second light source, the first scattering optical system receives the second light transmitted through the second optical path adjusting device The second wavelength band light is reflected to form scattered light of the second wavelength band; the second optical path adjusting device reflects at least part of the light of the second wavelength band from the first scattering optical system, and the second wavelength band light is passed through the second wavelength band. The light of the second wavelength band from the first scattering optical system reflected by the two optical path adjustment devices is directed to the dichroic mirror;

When the light of the second wavelength band emitted by the second light source is at least partially reflected by the second optical path adjustment device, the first scattering optical system receives the reflected light from the second optical path adjustment device The light of the second wavelength band is reflected to form scattered light of the second wavelength band; the second optical path adjusting device transmits at least part of the light of the second wavelength band from the first scattering optical system; transmission The light of the second wavelength band from the first scattering optical system passing through the second optical path adjusting device is directed to the dichroic mirror;

When the dichroic mirror transmits the light of the first wavelength band emitted by the first light source, the wavelength conversion device receives the light of the first wavelength band transmitted through the dichroic mirror, and converts it into converted into light in a third wavelength band different from both the first wavelength band and the second wavelength band; the dichroic mirror reflects the light in the third wavelength band from the wavelength conversion device; the dichroic mirror a mirror transmits the light of the second wavelength band from the second optical path adjusting device;

When the dichroic mirror reflects the light of the first wavelength band emitted by the first light source, the wavelength conversion device receives the light of the first wavelength band reflected from the dichroic mirror, converting it into light of a third wavelength band different from both the first wavelength band and the second wavelength band; the dichroic mirror transmits the light of the third wavelength band from the wavelength conversion device; the The dichroic mirror reflects the light of the second wavelength band from the second optical path adjusting device.

Preferably, the second optical path adjusting device is a second polarizing beam splitter, and the second polarizing beam splitter has the following characteristics with respect to the incident light of the second wavelength band: reflecting light of the second wavelength band having the first polarization direction Linearly polarized light and transmit the linearly polarized light of the second wavelength band having a second polarization direction, wherein the first polarization direction is different from the second polarization direction.

In the above technical solution, the second polarizing beam splitter is a plate-type polarizing beam splitter or a cube-type polarizing beam splitter.

Preferably, it also includes a polarization conversion element, the polarization conversion element is located on the optical path between the second optical path adjustment device and the first scattering optical system, and is used to make the second optical path adjustment device emit light toward the When the light of the second wavelength band of the first scattering optical system is reflected by the first scattering optical system and returns to the second optical path adjusting device, its polarization direction or polarization state is changed.

Preferably, the polarization conversion element is a first quarter wave plate.

the first laser is used for emitting light in the first wavelength band;

the second laser is used for emitting light in the second wavelength band;

Preferably, it also includes a second collection optical system, the second collection optical system is located on the optical path between the second optical path adjustment device and the first scattering optical system, and is used for adjusting the optical path from the second optical path. The light of the second wavelength band of the device is converged toward the first scattering optical system, and at the same time, the light of the second wavelength band from the first scattering optical system is collected and directed to the second optical path adjustment device.

Preferably, it also includes a second uniform light optical system, the second uniform light optical system is located on the optical path from the second light source to the second light path adjustment device, and is used for uniformly emitted light from the second light source. the light of the second wavelength band.

In the above technical solution, the second uniform light optical system may be composed of a diffuser, an optical integrator or at least one fly-eye lens array, wherein the optical integrator may be solid or hollow. In addition, since the use of the diffusing sheet will diffuse the light of the second wavelength band emitted by the second light source, a light path from the second light source to the diffusing sheet or on the optical path from the diffusing sheet to the second optical path adjusting device can be arranged The positive lens is used for converging the light of the second wavelength band emitted from the second light source to the second optical path adjusting device.

Preferably, a condensing optical system is also included for condensing the light emitted from the dichroic mirror.

Preferably, a second lens group is also included, the second lens group is located on the light path from the second light source to the second light path adjusting device, and is used for reducing the second light source emitted by the second light source. A beam of light in a wavelength band.

Preferably, a reflective element is further included, the reflective element is located on the optical path between the second light source and the second optical path adjusting device, the reflective element has a transmission area and a reflection area, the transmission area allows the The light of the second wavelength band passes through or is transmitted, and the reflection area is used for reflecting the light of the second wavelength band from the second optical path adjusting device, and at least part of the light is reflected back to the second optical path adjusting device .

Preferably, it also includes a light guide optical system, the light guide optical system is located on the light path from the second light source to the second light path adjusting device, and is used to guide the light emitted from the second light source at least in part. The light of the second wavelength band passes through or is transmitted through the transmission area of the reflective element and then enters the second optical path adjusting device.

In the above technical solution, the light guiding optical system may be constituted by a lens, a compound parabolic concentrator or a light guiding column alone, or may be constituted by any combination of the above-mentioned optical elements. In addition, the number of lenses, compound parabolic concentrators, and light guide rods can be determined as required, which may be one, or two or more. The light guide rod may be solid or hollow, and the end face of the light guide rod may be plane or non-planar.

Preferably, it also includes a second scattering optical system, the second optical path adjusting device allows the light of the second wavelength band emitted by the second light source to be partially transmitted and partially reflected to be emitted from different optical paths, the first scattering optical system The optical system receives the light of the second wavelength band emitted from one of the optical paths, the second scattering optical system receives the light of the second wavelength band emitted from the other optical path, reflects it and forms the scattered second wavelength The second optical path adjusting device transmits or reflects the light of the second wavelength band from the second scattering optical system to the dichroic mirror, and the dichroic mirror transmits it or reflection.

Preferably, it also includes a third collection optical system, the third collection optical system is located on the optical path between the second optical path adjustment device and the second scattering optical system, and is used for adjusting the optical path from the second optical path. The light of the second wavelength band of the device is condensed toward the second scattering optical system, and at the same time, the light of the second wavelength band from the second scattering optical system is collected and directed to the second light path adjustment device.

Preferably, a second quarter-wave plate is also included, and the second quarter-wave plate is located on the optical path between the second optical path adjusting device and the second scattering optical system.

Those skilled in the art can also set a heat sink for heat dissipation of the first light source and/or the second light source and/or the wavelength conversion device as required.

In the present invention, by using the first scattering optical system, the light mixing effect of the outgoing light can be improved. In the present invention, the first light source and the second light source are independent of each other, so that the color temperature of the light emitted by the light-emitting device can be freely adjusted by adjusting the power of the first light source and the second light source independently, and the light-emitting device will not be affected. luminous flux output. At the same time, a laser capable of emitting light of different dominant wavelengths can be used in the second light source to expand the spectrum of the blue light band, thereby improving the color rendering index of the emitted light of the light-emitting device. In addition, the light emitted by the first light source in the present invention is all used to excite the wavelength conversion device. Therefore, compared with the prior art solution, the light-emitting device provided in the present invention can achieve more efficient etendue without increasing the etendue. For high luminous flux output, if a polarization selection element is used in conjunction with the first light source, the luminous flux output of the light-emitting device can be further improved without affecting the etendue of the light-emitting device.

The light-emitting device of the present invention has the characteristics of high brightness, small etendue, high color rendering index, long working life, etc., and can be applied to systems requiring high light intensity and small etendue, such as entertainment lighting systems, projection systems, automobiles, etc. Lighting systems, medical lighting systems, search lighting systems, field work lighting systems, marine lighting systems, portable lighting systems, etc., especially suitable for entertainment lighting systems and projection lighting systems.

Description of drawings

1 is a schematic structural diagram of an existing light-emitting device using a dichroic mirror;

2 is a schematic structural diagram of an existing light-emitting device using a polarization beam splitter;

3 is a schematic structural diagram of a static wavelength conversion device;

Fig. 4 and Fig. 5 illustrate the dynamic wavelength conversion device of two different structural forms;

6 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 1;

7 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 2;

8 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 3;

9 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 4;

10 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 5;

11 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 6;

12 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 7;

13 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 8;

14 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 9;

15 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 10;

16 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 11;

17 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 12;

18 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 13;

19 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 14;

20 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 15;

21 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 16;

22 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 17;

23 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 18;

24 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 19;

25 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 20;

26 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 21;

27 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 22;

28 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 23;

FIG. 29 is a schematic structural diagram of a light-emitting device disclosed in Embodiment 24. FIG.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments. It should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

The structure of the static wavelength conversion device used in the following embodiments may be as shown in FIG. 3 . The dynamic wavelength conversion device used in the following embodiments may be the dynamic wavelength conversion device as shown in FIG. 4 or the dynamic wavelength conversion device as shown in FIG. 5 .

A static wavelength conversion device 301 as shown in FIG. 3 includes a reflective layer 301a and a wavelength conversion layer 301b disposed on the reflective layer 301a, wherein the wavelength conversion layer 301b is made of a yellow fluorescent material (such as: yellow fluorescent powder or yellow fluorescent ceramic), which converts incident blue light into yellow light, and the reflective layer 301a is a reflective substrate.

As shown in FIG. 4, a dynamic wavelength conversion device is a rotatable fluorescent wheel 401, which includes a reflective layer and a wavelength conversion layer Y disposed on the reflective layer. The wavelength conversion layer Y is composed of a yellow fluorescent material (eg, yellow fluorescent powder or yellow fluorescent ceramic), which converts incident blue light into yellow light.

Another dynamic wavelength conversion device shown in FIG. 5 is a rotatable fluorescent wheel 501, which includes a reflective layer and two different wavelength conversion layers arranged on the reflective layers in different sectors of the fluorescent wheel 501, They are the wavelength conversion layer G and the wavelength conversion layer R, respectively. The wavelength conversion layer G is composed of a green fluorescent material (eg, green fluorescent powder or green fluorescent ceramic), which converts incident blue light into green light. The wavelength conversion layer R is composed of a red fluorescent material (eg, red fluorescent powder or red fluorescent ceramic), which converts incident blue light into red light.

Example 1

As shown in FIG. 6, a light-emitting device disclosed in this embodiment includes a first light source 601, a second light source 602, a dichroic mirror 603, a first collection optical system, a wavelength conversion device 605, a first optical path adjustment device, a polarization A conversion element, a second collection optical system, a first scattering optical system, and a condensing optical system. The first light source 601 includes a plurality of lasers 601a and a plurality of collimating lenses 601b corresponding to the plurality of lasers 601a one-to-one, wherein the laser 601a emits blue light with a dominant wavelength of 455 nm. The second light source 602 includes a plurality of lasers 602a and a plurality of collimating lenses 602b corresponding to the plurality of lasers 602a one-to-one, wherein the laser 602a emits blue light with a dominant wavelength of 455 nm. The first collection optical system consists of a lens group 604 including a lens 604a and a lens 604b. The wavelength conversion device 605 includes a reflective layer 605a and a wavelength conversion layer 605b provided on the reflective layer 605a. The first optical path adjusting device is a flat-plate polarizing beam splitter 606 . The polarization conversion element is a quarter wave plate 607 . The second collection optical system is constituted by a lens group 608 including a lens 608a and a lens 608b. The first scattering optical system is constituted by a reflective scattering plate 609 . The condensing optical system consists of a focusing lens 610 .

The characteristic of the dichroic mirror 603 in this embodiment is to reflect blue light and transmit yellow light. The blue light emitted by the first light source 601 is reflected by the dichroic mirror 603 and then directed to the lens group 604. The lens group 604 converges the blue light from the dichroic mirror 603 toward the wavelength conversion device 605, and the wavelength conversion device 605 converts the incident blue light into The yellow light is directed to the lens group 604 , and the yellow light is collected by the lens group 604 and then directed to the dichroic mirror 603 .

The characteristics of the flat-type polarizing beam splitter 606 in this embodiment are to reflect the blue light of the S-polarized light and transmit the blue light of the P-polarized light, and at the same time, the flat-type polarizing beam splitter 606 also transmits the yellow light. The blue light of the P-polarized light emitted from the second light source 602 is transmitted through the flat-plate polarizing beam splitter 606 and then directed to the quarter-wave plate 607 . The blue light of P-polarized light is converted into blue light of circularly polarized light after being transmitted through the quarter-wave plate 607 , and the lens group 608 converges the blue light of circularly polarized light toward the reflective diffusion plate 609 . The reflective diffusing plate 609 reflects the blue light of the incident circularly polarized light, and the blue light of the circularly polarized light reflected by the reflective diffusing plate 609 is collected by the lens group 608 and then directed to the quarter-wave plate 607 . The blue light of the circularly polarized light is transmitted through the quarter-wave plate 607 and converted into blue light of the S-polarized light, and the blue light of the S-polarized light is directed to the flat-plate polarization beam splitter 606 .

Since the characteristics of the flat-type polarizing beam splitter 606 are to reflect the blue light of the S-polarized light and transmit the blue light of the P-polarized light, and at the same time, the flat-type polarizing beam splitter 606 also transmits the yellow light, the yellow light transmitted through the flat-type polarizing beam splitter 606 The light and the blue light of the S-polarized light reflected by the flat polarizing beam splitter 606 can be combined into a mixed light and directed to the focusing lens 610, and the mixed light of the yellow light and the blue light is white light. Finally, the focusing lens 610 makes the white light converge and combine. emitted from the light-emitting device.

Example 2

As shown in FIG. 7 , a light-emitting device disclosed in this embodiment includes a first light source 701 (composed of several lasers 701a and several collimating lenses 701b corresponding to several lasers 701a one-to-one), a second light source 702 ( It consists of several lasers 702a and several collimating lenses 702b corresponding to several lasers 702a), a dichroic mirror 703, a first collection optical system (composed of a lens group 704 including a lens 704a and a lens 704b), A wavelength conversion device 705 (including a reflective layer 705a and a wavelength conversion layer 705b disposed on the reflective layer 705a), a first optical path adjustment device (consisting of a flat-plate polarizing beam splitter 706), a polarization conversion element (consisting of a quarter wave plate 707), a second collection optical system (composed of a lens group 708 including a lens 708a and a lens 708b), a first scattering optical system (composed of a reflective scattering plate 709), a condensing optical system (composed of a focusing lens 710 ), a first lens group 711 and a second lens group 712 .

The first difference between this embodiment and Embodiment 1 is that a first lens group 711 is provided on the optical path from the first light source 701 to the dichroic mirror 703, and the first lens group 711 consists of a positive lens 711a and a negative lens 711a. The lens 711b is configured to reduce the light beam formed by the blue light emitted from the first light source 701 .

The second difference between this embodiment and Embodiment 1 is that a second lens group 712 is provided on the optical path from the second light source 702 to the flat-plate polarizing beam splitter 706, and the second lens group 712 consists of a positive lens 712a and a The negative lens 712b is formed to reduce the light beam formed by the blue light emitted from the second light source 702 .

Example 3

As shown in FIG. 8 , a light-emitting device disclosed in this embodiment includes a first light source 801 (composed of several lasers 801a and several collimating lenses 801b corresponding to several lasers 801a one-to-one), a second light source 802 ( It is composed of several lasers 802a and several collimating lenses 802b corresponding to several lasers 802a), a dichroic mirror 803, a first collection optical system (composed of a lens group 804 including a lens 804a and a lens 804b), Wavelength conversion device 805 (including reflective layer 805a and wavelength conversion layer 805b provided on reflective layer 805a), first optical path adjustment device, polarization conversion element (composed of a quarter-wave plate 807), second collection optical system (consisting of lens group 808 including lens 808a and lens 808b), first scattering optical system (consisting of one reflective diffusing plate 809), condensing optical system (consisting of one condensing lens 810), first uniform light optical system And the second uniform light optical system.

The first difference between this embodiment and Embodiment 1 is that the first optical path adjusting device in this embodiment is composed of a cube-type polarizing beam splitter 806 instead of a plate-type polarizing beam splitter.

The second difference between this embodiment and Embodiment 1 is that a first uniform light optical system is provided on the optical path from the first light source 801 to the dichroic mirror 803, and the first uniform light optical system consists of a transmissive diffuser 813 is used to uniformly emit blue light emitted by the first light source 801 .

The third difference between this embodiment and Embodiment 1 is that a second uniform light optical system is provided on the optical path from the second light source 802 to the cube-type polarizing beam splitter 806, and the second uniform light optical system is composed of a transmissive diffuser The sheet 814 is formed for uniformizing the blue light emitted by the second light source 802 .

Example 4

As shown in FIG. 9, a light-emitting device disclosed in this embodiment includes a first light source 901 (composed of several lasers 901a and several collimating lenses 901b corresponding to several lasers 901a one-to-one), a second light source 902, Dichroic mirror 903, first collection optical system (consisting of lens group 904 including lens 904a and lens 904b), wavelength conversion device 905 (including reflection layer 905a and wavelength conversion layer 905b provided on reflection layer 905a), second an optical path adjustment device (consisting of a flat-plate polarizing beam splitter 906), a polarization conversion element (consisting of a quarter-wave plate 907), a second collecting optical system (consisting of a lens group 908 including a lens 908a and a lens 908b) ), a first scattering optical system (composed of a reflective diffusion plate 909 ), and a condensing optical system (composed of a focusing lens 910 ).

The difference between this embodiment and Embodiment 1 is that the second light source 902 in this embodiment includes several lasers 902a, several collimating lenses 902b corresponding to several lasers 902a one-to-one, several lasers 902c and Several lasers 902c correspond to several collimating lenses 902d in one-to-one correspondence. The laser 902a emits blue light with a dominant wavelength of 455 nm, while the laser 902c emits blue light with a dominant wavelength of 465 nm. Compared with Embodiment 1, the use of lasers capable of emitting blue light with different dominant wavelengths can expand the spectrum of the blue light band, thereby improving the color rendering index of the light emitted by the light-emitting device. Meanwhile, since the second light source 902 is not used to excite the wavelength conversion device 905 to obtain yellow light, changing the wavelength band of the light emitted by the second light source 902 will not affect the conversion efficiency of the wavelength conversion device 905 .

Example 5

As shown in FIG. 10 , a light-emitting device disclosed in this embodiment includes a first light source 1001, a second light source 1002 (composed of several lasers 1002a and several collimating lenses 1002b corresponding to the several lasers 1002a one-to-one), A dichroic mirror 1003, a first collection optical system (consisting of a lens group 1004 including a lens 1004a and a lens 1004b), a wavelength conversion device 1005 (including a reflective layer 1005a and a wavelength conversion layer 1005b disposed on the reflective layer 1005a), a second An optical path adjustment device (composed of a flat-plate polarizing beam splitter 1006), a polarization conversion element (composed of a quarter-wave plate 1007), a second collection optical system (composed of a lens group 1008 including a lens 1008a and a lens 1008b) ), a first scattering optical system (composed of a reflective diffusion plate 1009), and a condensing optical system (composed of a focusing lens 1010).

The difference between this embodiment and Embodiment 1 is that the first light source 1001 in this embodiment includes several lasers 1001a, several collimating lenses 1001b, several lasers 1001c and several lasers 1001a corresponding to one-to-one Several collimating lenses 1001d and polarization selecting elements 1001e correspond to several lasers 1001c one-to-one. The laser 1001a emits S-polarized blue light and is incident on one side of the polarization selection element 1001e, and the laser 1001c emits P-polarized blue light and is incident on the other side of the polarization selection element 1001e. The characteristic of the polarization selection element 1001e is to reflect blue light of S-polarized light and transmit blue light of P-polarized light. The blue light of the S-polarized light emitted by the laser 1001a and the blue light of the P-polarized light emitted by the laser 1001c are combined into one light by the polarization selection element 1001e. Compared with Embodiment 1, the first light source 1001 in this embodiment can emit more blue light without affecting the etendue of the light-emitting device, so that more yellow light can be obtained after the wavelength conversion device 1005 is excited. .

Example 6

As shown in FIG. 11 , a light-emitting device disclosed in this embodiment includes a first light source 1101, a second light source 1102 (composed of several lasers 1102a and several collimating lenses 1102b corresponding to the several lasers 1102a one-to-one), Dichroic mirror 1103, first collecting optical system (consisting of lens group 1104 including lens 1104a and lens 1104b), wavelength conversion device 1105 (including reflective layer 1105a and wavelength conversion layer 1105b provided on reflective layer 1105a), second An optical path adjustment device (composed of a flat-plate polarizing beam splitter 1106), a polarization conversion element (composed of a quarter-wave plate 1107), a second collection optical system (composed of a lens group 1108 including a lens 1108a and a lens 1108b) ), a first scattering optical system (composed of a reflective diffusion plate 1109 ), and a condensing optical system (composed of a focusing lens 1110 ).

The difference between this embodiment and Embodiment 1 is that the first light source 1101 in this embodiment includes several lasers 1101a, several collimating lenses 1101b, several lasers 1101c, and several lasers 1101a corresponding to the several lasers 1101a one-to-one. Several lasers 1101c correspond to several collimating lenses 1101d, polarization selecting elements 1101e, and reflecting mirrors 1101f. The laser 1101a emits blue light of S polarized light and is reflected by the mirror 1101f and then incident on one side of the polarization selection element 1101e, and the laser 1101c emits blue light of P polarized light and is incident on the other side of the polarization selection element 1101e. The characteristic of the polarization selection element 1101e is to reflect blue light of S-polarized light and transmit blue light of P-polarized light. The blue light of the S-polarized light emitted by the laser 1101a and the blue light of the P-polarized light emitted by the laser 1101c are combined into one light by the polarization selection element 1101e. Compared with Embodiment 1, the first light source 1101 in this embodiment can emit more blue light without affecting the etendue of the light-emitting device, so that more yellow light can be obtained after the wavelength conversion device 1105 is excited. .

Example 7

As shown in FIG. 12 , a light-emitting device disclosed in this embodiment includes a first light source 1201 (composed of several lasers 1201a and several collimating lenses 1201b corresponding to the several lasers 1201a one-to-one), a second light source 1202 ( It consists of several lasers 1202a and several collimating lenses 1202b corresponding to several lasers 1202a), a dichroic mirror 1203, a first collection optical system (which consists of a lens group 1204 including a lens 1204a and a lens 1204b), A wavelength conversion device, a first optical path adjustment device (consisting of a flat-plate polarizing beam splitter 1206), a polarization conversion element (consisting of a quarter-wave plate 1207), a second collection optical system (consisting of a lens 1208a and a lens 1208b) composed of a lens group 1208), a first scattering optical system and a condensing optical system (composed of a focusing lens 1210).

The first difference between this embodiment and Embodiment 1 is that the wavelength conversion device in this embodiment is a rotatable fluorescent wheel 1205 .

The second difference between this embodiment and Embodiment 1 is that the first scattering optical system in this embodiment is a rotatable reflective scattering plate 1209 .

Example 8

As shown in FIG. 13 , a light-emitting device disclosed in this embodiment includes a first light source 1301 (composed of several lasers 1301a and several collimating lenses 1301b corresponding to several lasers 1301a one-to-one), a second light source 1302 ( It consists of several lasers 1302a and several collimating lenses 1302b corresponding to several lasers 1302a), a dichroic mirror 1303, a first collection optical system (which consists of a lens group 1304 including a lens 1304a and a lens 1304b), The wavelength conversion device 1305 (including the reflective layer 1305a and the wavelength conversion layer 1305b disposed on the reflective layer 1305a), the first optical path adjustment device (composed of a flat plate polarizing beam splitter 1306), the polarization conversion element (composed of a quarter wave plate 1307), a second collecting optical system (consisting of a lens group 1308 including a lens 1308a and a lens 1308b), a first scattering optical system 1309, and a condensing optical system (consisting of a focusing lens 1310).

The difference between this embodiment and Embodiment 1 is that the first scattering optical system 1309 in this embodiment is composed of a transmissive scattering plate 1309a and a reflecting mirror 1309b.

Example 9

As shown in FIG. 14 , a light-emitting device disclosed in this embodiment includes a first light source 1401 (composed of several lasers 1401a and several collimating lenses 1401b corresponding to the several lasers 1401a one-to-one), a second light source 1402 ( It consists of several lasers 1402a and several collimating lenses 1402b corresponding to several lasers 1402a), a dichroic mirror 1403, a first collection optical system (which consists of a lens group 1404 including a lens 1404a and a lens 1404b), The wavelength conversion device 1405 (including the reflective layer 1405a and the wavelength conversion layer 1405b provided on the reflective layer 1405a), the first optical path adjustment device (composed of a flat-plate polarizing beam splitter 1406), the polarization conversion element (composed of a quarter wave plate 1407), a second collecting optical system (consisting of a lens group 1408 including a lens 1408a and a lens 1408b), a first scattering optical system (consisting of a reflective scattering plate 1409), and a condensing optical system (consisting of a focusing lens 1410).

The difference between this embodiment and Embodiment 1 is that the characteristic of the dichroic mirror 1403 in this embodiment is to transmit blue light and reflect yellow light, and the blue light emitted by the first light source 1401 is transmitted through the dichroic mirror 1403 and then directed to the lens Group 1404, the lens group 1404 converges the blue light from the dichroic mirror 1403 towards the wavelength conversion device 1405, and the wavelength conversion device 1405 converts the incident blue light into yellow light and sends it to the lens group 1404. The yellow light is collected by the lens group 1404 and then emitted. It is directed to the dichroic mirror 1403, and then reflected by the dichroic mirror 1403 and then directed to the flat-plate polarizing beam splitter 1406.

Example 10

As shown in FIG. 15 , a light-emitting device disclosed in this embodiment includes a first light source 1501 (composed of several lasers 1501a and several collimating lenses 1501b corresponding to the several lasers 1501a one-to-one), a second light source 1502 ( It consists of several lasers 1502a and several collimating lenses 1502b corresponding to several lasers 1502a), a dichroic mirror 1503, a first collection optical system (which consists of a lens group 1504 including a lens 1504a and a lens 1504b), The wavelength conversion device 1505 (including the reflective layer 1505a and the wavelength conversion layer 1505b provided on the reflective layer 1505a), the first optical path adjustment device (composed of a flat-plate polarizing beam splitter 1506), the polarization conversion element (composed of a quarter wave plate 1507), a second collecting optical system (consisting of a lens group 1508 including a lens 1508a and a lens 1508b), a first scattering optical system (consisting of a reflective diffusing plate 1509), and a condensing optical system (consisting of a focusing lens 1510).

The difference between this embodiment and Embodiment 1 is that the characteristics of the flat-type polarizing beam splitter 1506 in this embodiment are to reflect the blue light of S-polarized light and transmit the blue light of P-polarized light, and at the same time, the flat-type polarizing beam splitter 1506 also reflects yellow light. Light. The blue light of the S-polarized light emitted from the second light source 1502 is reflected by the flat-plate polarizing beam splitter 1506 and then directed to the quarter-wave plate 1507 , and the blue light of the S-polarized light is transmitted through the quarter-wave plate 1507 and then converted into circular polarization light blue light. The lens group 1508 focuses the blue light of the circularly polarized light toward the reflective diffuser plate 1509, and the reflective diffuser plate 1509 reflects the blue light of the incident circularly polarized light. The blue light of the circularly polarized light reflected by the reflective diffuser 1509 is collected by the lens group 1508 and then directed to the quarter-wave plate 1507 , and the blue light of the circularly polarized light is transmitted through the quarter-wave plate 1507 and then converted into P-polarized light The blue light of the P-polarized light is directed to the flat-plate polarizing beam splitter 1506 . The flat-plate polarizing beam splitter 1506 transmits the blue light of the P-polarized light, while the flat-plate polarizing beam splitter 1506 reflects the yellow light from the dichroic mirror 1503 . The blue light of the P-polarized light transmitted through the flat-type polarizing beam splitter 1506 and the yellow light reflected by the flat-type polarizing beam splitter 1506 are combined into one mixed light and directed to the focusing lens 1510 .

Example 11

As shown in FIG. 16 , a light-emitting device disclosed in this embodiment includes a first light source 1601 (composed of several lasers 1601a and several collimating lenses 1601b corresponding to several lasers 1601a one-to-one), a second light source 1602 ( It consists of several lasers 1602a and several collimating lenses 1602b corresponding to several lasers 1602a), a dichroic mirror 1603, a first collection optical system (consisting of a lens group 1604 including a lens 1604a and a lens 1604b), A wavelength conversion device 1605 (including a reflective layer 1605a and a wavelength conversion layer 1605b disposed on the reflective layer 1605a), a first optical path adjustment device (consisting of a flat-plate polarizing beam splitter 1606), a polarization conversion element (consisting of a quarter wave plate 1607), a second collection optical system (composed of a lens group 1608 including a lens 1608a and a lens 1608b), a first scattering optical system (composed of a reflective scattering plate 1609), a condensing optical system (composed of a focusing lens 1610), a light guide optical system 1615, and a reflective element 1616.

The difference between this embodiment and Embodiment 1 is that a light guiding optical system 1615 and a reflective element 1616 are provided on the optical path from the second light source 1602 to the flat-plate polarizing beam splitter 1606 . The light guide optical system 1615 is composed of a positive lens 1615a and a positive lens 1615b, the transmission area of the reflective element 1616 is a light hole 1616a and the positive lens 1615b is located at the light hole 1616a. The blue light of the P-polarized light emitted from the second light source 1602 is guided to the flat-plate polarizing beam splitter 1606 by the light guiding optical system 1615 . The flat-type polarizing beam splitter 1606 has the characteristics of reflecting blue light of S-polarized light and transmitting blue light of P-polarized light, while the flat-type polarizing beam splitter 1606 also transmits yellow light. The blue light of the P-polarized light is transmitted through the flat-plate polarizing beam splitter 1606 and then directed to the quarter-wave plate 1607 . The blue light of the P-polarized light is transmitted through the quarter-wave plate 1607 and then converted into blue light of circularly polarized light. The lens group 1608 converges the blue light of the circularly polarized light toward the reflective diffuser plate 1609, and the reflective diffuser plate 1609 converts the incident circular The blue light of polarized light is reflected, and part of the blue light reflected by the reflective scattering plate 1609 becomes blue light of unpolarized light, and the rest of the light is still blue light of circularly polarized light. The blue light is collected by the lens group 1608 and then directed to the quarter-wave plate 1607, then transmitted through the quarter-wave plate 1607 and incident on the flat-plate polarizing beam splitter 1606. The blue light of circularly polarized light is converted into blue light of S-polarized light after being transmitted through the quarter wave plate 1607, and the blue light of these S-polarized light is reflected by the plate polarizing beam splitter 1606, while the blue light of non-polarized light is polarized by the plate type The light splitter 1606 separates the blue light of S-polarized light and the blue light of P-polarized light, wherein the blue light of S-polarized light is reflected by the flat-type polarized light splitter 1606, and the blue light of P-polarized light is transmitted through the flat-type polarized light beam splitter 1606 and emitted. towards the reflective element 1616. The reflective element 1616 reflects most of the blue light of the P-polarized light from the flat-type polarizing beam splitter 1606 and then sends it back to the flat-type polarizing beam-splitter 1606, and then these P-polarized blue light transmits through the flat-type polarizing beam splitter 1606 and then emits it again. To the quarter wave plate 1607.

Example 12

As shown in FIG. 17 , a light-emitting device disclosed in this embodiment includes a first light source 1701 (composed of several lasers 1701a and several collimating lenses 1701b corresponding to the several lasers 1701a one-to-one), a second light source 1702 ( It consists of several lasers 1702a and several collimating lenses 1702b corresponding to several lasers 1702a), a dichroic mirror 1703, a first collection optical system (consisting of a lens group 1704 including a lens 1704a and a lens 1704b), A wavelength conversion device 1705 (including a reflective layer 1705a and a wavelength conversion layer 1705b disposed on the reflective layer 1705a), a first optical path adjustment device (composed of a flat-plate polarizing beam splitter 1706), a polarization conversion element (composed of a quarter wave plate 1707), a second collection optical system (composed of a lens group 1708 including a lens 1708a and a lens 1708b), a first scattering optical system (composed of a reflective scattering plate 1709), a condensing optical system (composed of a focusing lens 1710), a quarter wave plate 1717, a third collection optical system, and a second scattering optical system. The third collection optical system consists of a lens group 1718 including a lens 1718a and a lens 1718b. The second scattering optical system is constituted by a reflective scattering plate 1719 .

The difference between this embodiment and Embodiment 1 is that when the blue light emitted by the second light source 1702 is incident on the flat-type polarizing beam splitter 1706, the blue light contains S-polarized light components and P-polarized light components, and the flat-type polarizing beam splitter 1706 separates the The blue light of S-polarized light and the blue light of P-polarized light are separated, and the blue light of S-polarized light therein is reflected and the blue light of P-polarized light therein is transmitted. Wherein: the traveling optical path of the blue light of the P-polarized light transmitted through the flat-type polarizing beam splitter 1706 is the same as the traveling optical path of the blue light of the P-polarized light transmitted through the flat-type polarizing beam splitter 606 in Example 1; The blue light of the S-polarized light reflected by the filter 1706 is directed to the dichroic mirror 1703 , which is reflected by the dichroic mirror 1703 and then directed to the quarter-wave plate 1717 . The blue light of S-polarized light is converted into blue light of circularly polarized light after being transmitted through the quarter-wave plate 1717 , and the lens group 1718 converges the blue light of circularly polarized light toward the reflective diffusion plate 1719 . The reflective diffusing plate 1719 reflects the incident circularly polarized blue light, and the circularly polarized blue light reflected by the reflective diffusing plate 1719 is collected by the lens group 1718 and then directed to the quarter-wave plate 1717 . The blue light of circularly polarized light is converted into blue light of P-polarized light after being transmitted through the quarter-wave plate 1717, and the blue light of these P-polarized light is reflected by the dichroic mirror 1703 and then directed to the plate-type polarization beam splitter 1706, and the plate-type polarization Beamsplitter 1706 transmits it.

In order to show the light path more clearly, in FIG. 17 , the light path from the second light source 1702 to the reflective diffuser plate 1709 and the light path from the second light source 1702 to the reflective diffuser plate 1719 are represented by dotted lines.

Example 13

As shown in FIG. 18 , a light-emitting device disclosed in this embodiment includes a first light source 1801, a second light source 1802, a dichroic mirror 1803, a first collection optical system, a wavelength conversion device 1805, a second optical path adjustment device, a polarization device A conversion element, a second collection optical system, a first scattering optical system, and a condensing optical system. The first light source 1801 includes a plurality of lasers 1801a and a plurality of collimating lenses 1801b corresponding to the plurality of lasers 1801a one-to-one, wherein the laser 1801a emits blue light with a dominant wavelength of 455 nm. The second light source 1802 includes a plurality of lasers 1802a and a plurality of collimating lenses 1802b corresponding to the plurality of lasers 1802a one-to-one, wherein the laser 1802a emits blue light with a dominant wavelength of 455 nm. The first collection optical system consists of a lens group 1804 including a lens 1804a and a lens 1804b. The wavelength conversion device 1805 includes a reflective layer 1805a and a wavelength conversion layer 1805b provided on the reflective layer 1805a. The second optical path adjusting device is a flat-plate polarizing beam splitter 1806 . The polarization conversion element is a quarter wave plate 1807 . The second collection optical system consists of a lens group 1808 including a lens 1808a and a lens 1808b. The first scattering optical system is constituted by a reflective scattering plate 1809 . The condensing optical system consists of a focusing lens 1810 .

The characteristic of the flat-plate polarizing beam splitter 1806 in this embodiment is to reflect the blue light of the S-polarized light and transmit the blue light of the P-polarized light. The blue light of the P-polarized light emitted from the second light source 1802 is transmitted through the flat-plate polarizing beam splitter 1806 and then directed to the quarter-wave plate 1807 . The blue light of P-polarized light is converted into blue light of circularly polarized light after being transmitted through the quarter-wave plate 1807 , and the lens group 1808 converges the blue light of circularly polarized light toward the reflective diffusing plate 1809 . The reflective diffuser plate 1809 reflects the blue light of the incident circularly polarized light, and the blue light of the circularly polarized light reflected by the reflective diffuser plate 1809 is collected by the lens group 1808 and then directed to the quarter-wave plate 1807 . The blue light of circularly polarized light is transmitted through the quarter-wave plate 1806 and then converted into blue light of S-polarized light and sent to the flat-type polarizing beam splitter 1806. The blue light of the S-polarized light is reflected by the flat-type polarizing beam splitter 1806 and then sent to the flat-type polarization beam splitter 1806. Dichroic mirror 1803.

The characteristic of the dichroic mirror 1803 in this embodiment is to transmit blue light and reflect yellow light. The blue light emitted by the first light source 1801 is transmitted through the dichroic mirror 1803 and then directed to the lens group 1804. The lens group 1804 converges the blue light from the dichroic mirror 1803 towards the wavelength conversion device 1805, and the wavelength conversion device 1805 converts the incident blue light into The yellow light is directed to the lens group 1804 , and the yellow light is collected by the lens group 1804 and then directed to the dichroic mirror 1803 .

Since the characteristics of the dichroic mirror 1803 are to transmit blue light and reflect yellow light, the blue light transmitted through the dichroic mirror 1803 and the yellow light reflected by the dichroic mirror 1803 can be combined into one mixed light and directed to the focusing lens 1810, and the mixed light of yellow light and blue light is white light, and finally, the focusing lens 1810 makes the white light converge and exit from the light-emitting device.

Example 14

As shown in FIG. 19 , a light-emitting device disclosed in this embodiment includes a first light source 1901 (composed of several lasers 1901a and several collimating lenses 1901b corresponding to the several lasers 1901a one-to-one), a second light source 1902 ( It consists of several lasers 1902a and several collimating lenses 1902b corresponding to several lasers 1902a), a dichroic mirror 1903, a first collection optical system (consisting of a lens group 1904 including a lens 1904a and a lens 1904b), The wavelength conversion device 1905 (including the reflective layer 1905a and the wavelength conversion layer 1905b provided on the reflective layer 1905a), the second optical path adjustment device (consisting of a flat plate polarizing beam splitter 1906), the polarization conversion element (consisting of a quarter wave plate 1907), second collection optical system (composed of lens group 1908 including lens 1908a and lens 1908b), first scattering optical system (composed of a reflective scattering plate 1909), condensing optical system (composed of a focusing lens 1910), a first lens group 1911 and a second lens group 1912.

The first difference between this embodiment and Embodiment 13 is that a first lens group 1911 is provided on the optical path from the first light source 1901 to the dichroic mirror 1903, and the first lens group 1911 consists of a positive lens 1911a and a negative lens 1911a. The lens 1911b is configured to reduce the light beam formed by the blue light emitted from the first light source 1901 .

The second difference between this embodiment and Embodiment 13 is that a second lens group 1912 is provided on the optical path from the second light source 1902 to the flat-plate polarizing beam splitter 1906, and the second lens group 1912 consists of a positive lens 1912a and a The negative lens 1912b is configured to reduce the light beam formed by the blue light emitted by the second light source 1902.

Example 15

As shown in FIG. 20 , a light-emitting device disclosed in this embodiment includes a first light source 2001 (composed of several lasers 2001a and several collimating lenses 2001b corresponding to several lasers 2001a one-to-one), a second light source 2002 ( It consists of several lasers 2002a and several collimating lenses 2002b corresponding to several lasers 2002a), a dichroic mirror 2003, a first collection optical system (which consists of a lens group 2004 including a lens 2004a and a lens 2004b), Wavelength conversion device 2005 (including reflective layer 2005a and wavelength conversion layer 2005b disposed on reflective layer 2005a), second optical path adjustment device, polarization conversion element (composed of a quarter-wave plate 2007), second collection optical system (composed of a lens group 2008 including a lens 2008a and a lens 2008b), a first scattering optical system (composed of a reflective scattering plate 2009), a condensing optical system (composed of a focusing lens 2010), a first uniform light optical system And the second uniform light optical system.

The first difference between this embodiment and Embodiment 13 is that the second optical path adjusting device in this embodiment is composed of a cube-type polarizing beam splitter 2006 instead of a plate-type polarizing beam splitter.

The second difference between this embodiment and Embodiment 13 is that a first uniform light optical system is provided on the optical path from the first light source 2001 to the dichroic mirror 2003, and the first uniform light optical system consists of a transmissive diffuser 2013, and is used to uniformize the blue light emitted by the first light source 2001.

The third difference between this embodiment and the thirteenth embodiment is that a second homogenizing optical system is provided on the optical path from the second light source 2002 to the cube-type polarizing beam splitter 2006, and the second homogenizing optical system is composed of a transmissive diffuser The sheet 2014 is formed to uniformly emit the blue light emitted by the second light source 2002 .

Example 16

As shown in FIG. 21, a light-emitting device disclosed in this embodiment includes a first light source 2101 (composed of several lasers 2101a and several collimating lenses 2101b corresponding to the several lasers 2101a one-to-one), a second light source 2102, A dichroic mirror 2103, a first collection optical system (consisting of a lens group 2104 including a lens 2104a and a lens 2104b), a wavelength conversion device 2105 (including a reflective layer 2105a and a wavelength conversion layer 2105b disposed on the reflective layer 2105a), a second Two optical path adjustment devices (composed of a flat-plate polarizing beam splitter 2106), polarization conversion elements (composed of a quarter-wave plate 2107), and a second collection optical system (composed of a lens group 2108 including a lens 2108a and a lens 2108b) ), a first scattering optical system (composed of a reflective scattering plate 2109), and a condensing optical system (composed of a focusing lens 2110).

The difference between this embodiment and Embodiment 13 is that the second light source 2102 in this embodiment includes several lasers 2102a, several collimating lenses 2102b corresponding to several lasers 2102a one-to-one, several lasers 2102c and several lasers 2102a. Several lasers 2102c correspond to several collimating lenses 2102d one-to-one. The laser 2102a emits blue light with a dominant wavelength of 455 nm, while the laser 2102c emits blue light with a dominant wavelength of 465 nm. Compared with Example 13, the use of lasers capable of emitting blue light with different dominant wavelengths can expand the spectrum of the blue light band, thereby improving the color rendering index of the light emitted by the light-emitting device. Meanwhile, since the second light source 2102 is not used to excite the wavelength conversion device 2105 to obtain yellow light, changing the wavelength band of the light emitted by the second light source 2102 will not affect the conversion efficiency of the wavelength conversion device 2105 .

Example 17

As shown in FIG. 22 , a light-emitting device disclosed in this embodiment includes a first light source 2201, a second light source 2202 (composed of several lasers 2202a and several collimating lenses 2202b corresponding to the several lasers 2202a one-to-one), A dichroic mirror 2203, a first collection optical system (consisting of a lens group 2204 including a lens 2204a and a lens 2204b), a wavelength conversion device 2205 (including a reflective layer 2205a and a wavelength conversion layer 2205b disposed on the reflective layer 2205a), a second Two optical path adjustment devices (composed of a flat-plate polarizing beam splitter 2206), polarization conversion elements (composed of a quarter-wave plate 2207), and a second collection optical system (composed of a lens group 2208 including a lens 2208a and a lens 2208b) ), a first scattering optical system (composed of a reflective scattering plate 2209), and a condensing optical system (composed of a focusing lens 2210).

The difference between this embodiment and Embodiment 13 is that the first light source 2201 in this embodiment includes several lasers 2201a, several collimating lenses 2201b, several lasers 2201c, and several lasers 2201a corresponding to one-to-one lasers 2201a. Several collimating lenses 2201d and polarization selecting elements 2201e correspond to several lasers 2201c one-to-one. The laser 2201a emits S-polarized blue light and is incident on one side of the polarization selection element 2201e, and the laser 2201c emits P-polarized blue light and is incident on the other side of the polarization selection element 2201e. The characteristic of the polarization selection element 2201e is to reflect blue light of S-polarized light and transmit blue light of P-polarized light. The blue light of the S-polarized light emitted by the laser 2201a and the blue light of the P-polarized light emitted by the laser 2201c are combined into one light by the polarization selection element 2201e. Compared with Embodiment 13, the first light source 2201 in this embodiment can emit more blue light without affecting the etendue of the light-emitting device, so that more yellow light can be obtained after the wavelength conversion device 2205 is excited. .

Example 18

As shown in FIG. 23, a light-emitting device disclosed in this embodiment includes a first light source 2301, a second light source 2302 (composed of several lasers 2302a and several collimating lenses 2302b corresponding to the several lasers 2302a one-to-one), A dichroic mirror 2303, a first collection optical system (consisting of a lens group 2304 including a lens 2304a and a lens 2304b), a wavelength conversion device 2305 (including a reflective layer 2305a and a wavelength conversion layer 2305b disposed on the reflective layer 2305a), a second Two optical path adjustment devices (composed of a flat-plate polarizing beam splitter 2306), polarization conversion elements (composed of a quarter-wave plate 2307), and a second collection optical system (composed of a lens group 2308 including a lens 2308a and a lens 2308b) ), a first scattering optical system (composed of a reflective diffusion plate 2309), and a condensing optical system (composed of a focusing lens 2310).

The difference between this embodiment and Embodiment 13 is that the first light source 2301 in this embodiment includes several lasers 2301a, several collimating lenses 2301b, several lasers 2301c, and several lasers 2301a corresponding to one-to-one lasers 2301a. Several collimating lenses 2301d, polarization selecting elements 2301e, and reflecting mirrors 2301f are in one-to-one correspondence with several lasers 2301c. The laser 2301a emits S-polarized blue light and is reflected by the mirror 2301f and then incident on one side of the polarization selection element 2301e, and the laser 2301c emits P-polarized blue light and is incident on the other side of the polarization selection element 2301e. The characteristic of the polarization selection element 2301e is to reflect blue light of S-polarized light and transmit blue light of P-polarized light. The blue light of the S-polarized light emitted by the laser 2301a and the blue light of the P-polarized light emitted by the laser 2301c are combined into one light by the polarization selection element 2301e. Compared with Embodiment 13, the first light source 2301 in this embodiment can emit more blue light without affecting the etendue of the light-emitting device, so that more yellow light can be obtained after exciting the wavelength conversion device 2305 .

Example 19

As shown in FIG. 24 , a light-emitting device disclosed in this embodiment includes a first light source 2401 (composed of several lasers 2401a and several collimating lenses 2401b corresponding to several lasers 2401a one-to-one), a second light source 2402 ( It consists of several lasers 2402a and several collimating lenses 2402b corresponding to several lasers 2402a one-to-one), a dichroic mirror 2403, a first collection optical system (composed of a lens group 2404 including a lens 2404a and a lens 2404b), A wavelength conversion device, a second optical path adjustment device (consisting of a flat-plate polarizing beam splitter 2406), a polarization conversion element (consisting of a quarter-wave plate 2407), a second collection optical system (consisting of a lens 2408a and a lens 2408b) It consists of a lens group 2408), a first scattering optical system and a condensing optical system (composed of a focusing lens 2410).

The first difference between this embodiment and Embodiment 13 is that the wavelength conversion device in this embodiment is a rotatable fluorescent wheel 2405 .

The second difference between this embodiment and Embodiment 13 is that the first scattering optical system in this embodiment is a rotatable reflective scattering plate 2409 .

Example 20

As shown in FIG. 25 , a light-emitting device disclosed in this embodiment includes a first light source 2501 (composed of several lasers 2501a and several collimating lenses 2501b corresponding to several lasers 2501a one-to-one), a second light source 2502 ( It consists of several lasers 2502a and several collimating lenses 2502b corresponding to several lasers 2502a one-to-one), a dichroic mirror 2503, a first collection optical system (composed of a lens group 2504 including a lens 2504a and a lens 2504b), The wavelength conversion device 2505 (including the reflective layer 2505a and the wavelength conversion layer 2505b provided on the reflective layer 2505a), the second optical path adjustment device (composed of a flat-plate polarizing beam splitter 2506), the polarization conversion element (composed of a quarter wave plate 2507), a second collecting optical system (consisting of a lens group 2508 including a lens 2508a and a lens 2508b), a first scattering optical system 2509, and a condensing optical system (consisting of a focusing lens 2510).

The difference between this embodiment and Embodiment 13 is that the first scattering optical system 2509 in this embodiment is composed of a transmissive scattering plate 2509a and a reflecting mirror 2509b.

Example 21

As shown in FIG. 26 , a light-emitting device disclosed in this embodiment includes a first light source 2601 (composed of several lasers 2601a and several collimating lenses 2601b corresponding to the several lasers 2601a one-to-one), a second light source 2602 ( It consists of several lasers 2602a and several collimating lenses 2602b corresponding to several lasers 2602a one-to-one), a dichroic mirror 2603, a first collection optical system (composed of a lens group 2604 including a lens 2604a and a lens 2604b), The wavelength conversion device 2605 (including the reflective layer 2605a and the wavelength conversion layer 2605b provided on the reflective layer 2605a), the second optical path adjustment device (composed of a flat-plate polarizing beam splitter 2606), the polarization conversion element (composed of a quarter wave plate 2607), a second collecting optical system (consisting of a lens group 2608 including a lens 2608a and a lens 2608b), a first scattering optical system (consisting of a reflective diffusing plate 2609), and a condensing optical system (consisting of a focusing lens 2610).

The difference between this embodiment and Embodiment 13 is that the second light source 2602 emits the blue light of S-polarized light and emits it to the flat-type polarizing beam splitter 2606, and the characteristic of the flat-type polarizing beam splitter 2606 is to reflect the blue light of S-polarized light and make P-polarized light. The blue light of the light is transmitted, and the flat-plate polarizing beam splitter 2606 reflects the blue light of the S-polarized light emitted from the second light source 2602 to the quarter-wave plate 2607 . The blue light of S-polarized light is converted into blue light of circularly polarized light after being transmitted through the quarter-wave plate 2607 , and the lens group 2608 converges the blue light of circularly polarized light toward the reflective diffusing plate 2609 . The reflective diffuser plate 2609 reflects the incident circularly polarized blue light, and the circularly polarized blue light reflected by the reflective diffuser 2609 is collected by the lens group 2608 and then directed to the quarter-wave plate 2607 . The blue light of circularly polarized light is transmitted through the quarter-wave plate 2607 and then converted into blue light of P-polarized light and sent to the flat-type polarizing beam splitter 2606. Dichroic mirror 2603.

Example 22

As shown in FIG. 27 , a light-emitting device disclosed in this embodiment includes a first light source 2701 (composed of several lasers 2701a and several collimating lenses 2701b corresponding to the several lasers 2701a one-to-one), a second light source 2702 ( It consists of several lasers 2702a and several collimating lenses 2702b corresponding to several lasers 2702a one-to-one), a dichroic mirror 2703, a first collection optical system (composed of a lens group 2704 including a lens 2704a and a lens 2704b), The wavelength conversion device 2705 (including the reflective layer 2705a and the wavelength conversion layer 2705b disposed on the reflective layer 2705a), the second optical path adjustment device (composed of a flat-plate polarizing beam splitter 2706), the polarization conversion element (composed of a quarter wave plate 2707), a second collecting optical system (consisting of a lens group 2708 including a lens 2708a and a lens 2708b), a first scattering optical system (consisting of a reflective diffusing plate 2709), and a condensing optical system (consisting of a focusing lens 2710).

The difference between this embodiment and Embodiment 13 is that the characteristics of the dichroic mirror 2703 in this embodiment are to reflect blue light and transmit yellow light, and the blue light emitted by the first light source 2701 is reflected to the lens group by the dichroic mirror 2703 2704, the lens group 2704 converges the blue light from the dichroic mirror 2703 towards the wavelength conversion device 2705, and the wavelength conversion device 2705 converts the incident blue light into yellow light and sends it to the lens group 2704, and the yellow light is collected by the lens group 2704 and then emitted to the The dichroic mirror 2703 is transmitted through the dichroic mirror 2703.

Example 23

As shown in FIG. 28 , a light-emitting device disclosed in this embodiment includes a first light source 2801 (composed of several lasers 2801a and several collimating lenses 2801b corresponding to the several lasers 2801a one-to-one), a second light source 2802 ( It consists of several lasers 2802a and several collimating lenses 2802b corresponding to several lasers 2802a one-to-one), a dichroic mirror 2803, a first collection optical system (composed of a lens group 2804 including a lens 2804a and a lens 2804b), The wavelength conversion device 2805 (including the reflective layer 2805a and the wavelength conversion layer 2805b provided on the reflective layer 2805a), the second optical path adjustment device (composed of a flat-plate polarizing beam splitter 2806), the polarization conversion element (composed of a quarter wave plate 2807), a second collecting optical system (consisting of a lens group 2808 including a lens 2808a and a lens 2808b), a first scattering optical system (consisting of a reflective scattering plate 2809), a condensing optical system (consisting of a focusing lens 2810), a light guide optical system 2815, and a reflective element 2816.

The difference between this embodiment and Embodiment 13 is that a light guiding optical system 2815 and a reflective element 2816 are provided on the optical path from the second light source 2802 to the flat-plate polarizing beam splitter 2806 . The light guiding optical system 2815 is composed of a positive lens 2815a and a positive lens 2815b, the transmission area of the reflective element 2816 is a light-passing hole 2816a and the positive lens 2815b is located at the light-passing hole 2816a. The blue light of the P-polarized light emitted by the second light source 2802 is guided to the flat-plate polarizing beam splitter 2806 by the light guiding optical system 2815 . The plate polarizing beam splitter 2806 is characterized by reflecting blue light of S-polarized light and transmitting blue light of P-polarized light. The blue light of the P-polarized light is transmitted through the flat-plate polarizing beam splitter 2806 and then directed to the quarter-wave plate 2807 . The blue light of the P-polarized light is transmitted through the quarter-wave plate 2807 and converted into blue light of circularly polarized light. The lens group 2808 converges the blue light of the circularly polarized light toward the reflective diffuser plate 2809. The reflective diffuser plate 2809 converts the incident circular The blue light of polarized light is reflected, and part of the blue light reflected by the reflective scattering plate 2809 becomes blue light of unpolarized light, and the rest of the light is still blue light of circularly polarized light. The blue light is collected by the lens group 2808 and then directed to the quarter-wave plate 2807 , and then transmitted through the quarter-wave plate 2807 and incident on the flat-plate polarizing beam splitter 2806 . The blue light of circularly polarized light is converted into blue light of S-polarized light after being transmitted through the quarter wave plate 2807, and the blue light of these S-polarized light is reflected by the plate polarizing beam splitter 2806, while the blue light of non-polarized light is polarized by the plate type The light splitter 2806 separates the blue light of S polarized light and the blue light of P polarized light, wherein the blue light of S polarized light is reflected by the flat polarized light splitter 2806, and the blue light of P polarized light is transmitted through the flat polarized light splitter 2806 and emitted. to the reflective element 2816. The reflective element 2816 reflects most of the blue light from the P-polarized light from the flat-plate polarizing beam splitter 2806 and sends it back to the flat-plate polarizing beam splitter 2806, and then the P-polarized blue light is transmitted through the flat-plate polarizing beam splitter 2806 and then re-emitted. To the quarter wave plate 2807.

Example 24

As shown in FIG. 29 , a light-emitting device disclosed in this embodiment includes a first light source 2901 (composed of several lasers 2901a and several collimating lenses 2901b corresponding to several lasers 2901a one-to-one), a second light source 2902 ( It consists of several lasers 2902a and several collimating lenses 2902b corresponding to several lasers 2902a one-to-one), a dichroic mirror 2903, a first collection optical system (composed of a lens group 2904 including a lens 2904a and a lens 2904b), The wavelength conversion device 2905 (including the reflective layer 2905a and the wavelength conversion layer 2905b disposed on the reflective layer 2905a), the second optical path adjustment device (composed of a flat-plate polarizing beam splitter 2906), the polarization conversion element (composed of a quarter wave plate 2907), second collection optical system (composed of lens group 2908 including lens 2908a and lens 2908b), first scattering optical system (composed of a reflective scattering plate 2909), condensing optical system (composed of a focusing lens 2910), a quarter wave plate 2917, a third collection optical system, and a second scattering optical system. The third collection optical system consists of a lens group 2918 including a lens 2918a and a lens 2918b. The second scattering optical system is constituted by a reflective scattering plate 2919 .

The difference between this embodiment and Embodiment 13 is that when the blue light emitted by the second light source 2902 is incident on the flat-type polarizing beam splitter 2906, the blue light contains S-polarized light components and P-polarized light components, and the flat-type polarizing beam splitter 2906 separates the S-polarized light components and P-polarized light components. The blue light of S-polarized light and the blue light of P-polarized light are separated, and the blue light of S-polarized light therein is reflected and the blue light of P-polarized light therein is transmitted. Wherein: the traveling optical path of the blue light of the P-polarized light transmitted through the flat-type polarizing beam splitter 2906 is the same as the traveling optical path of the blue light of the P-polarized light transmitted through the flat-type polarizing beam splitter 1806 in Example 13; The blue light of the S-polarized light reflected by the filter 2906 is directed to the quarter wave plate 2917. The blue light of the S-polarized light is converted into blue light of circularly polarized light after being transmitted through the quarter-wave plate 2917 , and the blue light of the circularly polarized light is concentrated toward the reflective diffuser 2919 by the lens group 2918 . The reflective diffusing plate 2919 reflects the incident circularly polarized blue light, and the circularly polarized blue light reflected by the reflective diffusing plate 2919 is collected by the lens group 2918 and then directed to the quarter-wave plate 2917 . The blue light of circularly polarized light is transmitted through the quarter wave plate 2917 and then converted into blue light of P-polarized light, and these blue light of P-polarized light is directed to the plate-type polarization beam splitter 2906, and the plate-type polarization beam splitter 2906 transmits it.

In order to show the light path more clearly, in FIG. 29 , the light path from the second light source 2902 to the reflective diffuser plate 2909 and the light path from the second light source 2902 to the reflective diffuser plate 2919 are represented by dotted lines.

Claims

A light-emitting device, characterized in that it includes a first light source, a second light source, a dichroic mirror, a wavelength conversion device, a first optical path adjustment device, and a first scattering optical system, wherein:

the first light source is used for emitting light of the first wavelength band;

the second light source is used for emitting light in a second wavelength band, and the second wavelength band is the same as or different from the first wavelength band;

The dichroic mirror receives the light of the first wavelength band emitted by the first light source, and transmits or reflects it;

When the dichroic mirror transmits the light of the first wavelength band emitted by the first light source, the wavelength conversion device receives the light of the first wavelength band transmitted through the dichroic mirror, and converts it into converting into light of a third wavelength band different from the first wavelength band and the second wavelength band; the dichroic mirror reflects the light of the third wavelength band from the wavelength conversion device; passing through the dichroic mirror The light of the third wavelength band reflected by the color mirror is directed to the first optical path adjusting device;

When the dichroic mirror reflects the light of the first wavelength band emitted by the first light source, the wavelength conversion device receives the light of the first wavelength band reflected from the dichroic mirror, converting it into light of a third wavelength band different from both the first wavelength band and the second wavelength band; the dichroic mirror transmits the light of the third wavelength band from the wavelength conversion device; the light of the third wavelength band of the dichroic mirror is directed to the first optical path adjusting device;

The first optical path adjusting device receives the light of the second wavelength band emitted by the second light source, and makes it at least partially transmit or at least partially reflect;

When the light of the second wavelength band emitted by the second light source is at least partially transmitted by the first optical path adjustment device, the first scattering optical system receives the second light transmitted through the first optical path adjustment device the light of the second wavelength band, which is reflected to form scattered light of the second wavelength band; the first optical path adjusting device reflects at least part of the light of the second wavelength band from the first scattering optical system; the first An optical path adjusting device transmits the light of the third wavelength band from the dichroic mirror;

When the light of the second wavelength band emitted by the second light source is at least partially reflected by the first optical path adjustment device, the first scattering optical system receives the reflected light from the first optical path adjustment device The light of the second wavelength band is reflected to form scattered light of the second wavelength band; the first optical path adjusting device transmits at least part of the light of the second wavelength band from the first scattering optical system; the The first optical path adjusting device reflects the light of the third wavelength band from the dichroic mirror.
The light-emitting device according to claim 1, wherein the first optical path adjustment device is a first polarization beam splitter, and the first polarization beam splitter has the following first Characteristics: reflect the linearly polarized light of the second wavelength band with a first polarization direction and transmit the linearly polarized light of the second wavelength band with a second polarization direction, wherein the first polarization direction is different from the first polarization direction Two polarization directions; the first polarization beam splitter has the following second characteristic with respect to the incident light of the third wavelength band: transmits or reflects the light of the third wavelength band.
The light-emitting device according to claim 1, further comprising a polarization conversion element, wherein the polarization conversion element is located on the optical path between the first optical path adjustment device and the first scattering optical system, and uses a When the light of the second wavelength band emitted from the first optical path adjustment device to the first scattering optical system is reflected by the first scattering optical system and returned to the first optical path adjustment device, its polarization Orientation or polarization state changes.
The light-emitting device according to claim 3, wherein the polarization conversion element is a first quarter-wave plate.
The light-emitting device according to claim 1, wherein the first light source includes N first lasers and N first collimating elements corresponding to the N first lasers one-to-one, and N ≥1, where:

the first laser is used for emitting light in the first wavelength band;

The first collimating element is integrated in the first laser or disposed outside the first laser, and is used for collimating the light of the first wavelength band emitted by the first laser.
The light-emitting device according to claim 5, wherein the first light source further includes a polarization selection element, and the polarization selection element is characterized in that it reflects the S-polarized light of the first wavelength band and makes the The P-polarized light of the first wavelength band is transmitted, and at least one of the first lasers in the first light source is used to emit the S-polarized light of the first wavelength band to form incident light 1, and the rest of the first laser in the first light source The first laser is used to emit the P-polarized light of the first wavelength band to form incident light 2, and the polarization selection element combines the incident light 1 and the incident light 2 into one light and then emits the light.
The light-emitting device according to claim 1, wherein the second light source includes M second lasers and M second collimating elements corresponding to the M second lasers one-to-one, M ≥1, where:

the second laser is used for emitting light in the second wavelength band;

The second collimating element is integrated in the second laser or disposed outside the second laser, and is used for collimating the light of the second wavelength band emitted by the second laser.
The light-emitting device according to claim 1, wherein the first scattering optical system is composed of a first reflective scattering plate, or a first transmissive scattering plate and a first reflecting mirror.
The light-emitting device according to claim 1, further comprising a first collection optical system, wherein the first collection optical system is located on an optical path between the dichroic mirror and the wavelength conversion device, is used for condensing the light of the first wavelength band from the dichroic mirror towards the wavelength conversion device, and at the same time for collecting the light of the third wavelength band from the wavelength conversion device and making it radiate to the wavelength conversion device. The dichroic mirror.
The light-emitting device according to claim 1, further comprising a second collection optical system, the second collection optical system is located between the first optical path adjustment device and the first scattering optical system On the optical path, for condensing the light of the second wavelength band from the first optical path adjusting device toward the first scattering optical system, and for collecting the second wavelength band from the first scattering optical system the light and make it radiate to the first optical path adjusting device.
The light-emitting device according to claim 1, further comprising a first uniform light optical system, wherein the first uniform light optical system is located on an optical path from the first light source to the dichroic mirror , which is used to uniformly emit the light of the first wavelength band from the first light source.
The light-emitting device according to claim 1, further comprising a second uniform light optical system, wherein the second uniform light optical system is located in the light from the second light source to the first light path adjusting device On the way, the light of the second wavelength band emitted by the second light source is uniform.
The light-emitting device according to claim 1, further comprising a condensing optical system for condensing the light emitted from the first optical path adjusting device.
The light-emitting device according to claim 1, further comprising a first lens group, wherein the first lens group is located on an optical path from the first light source to the dichroic mirror, and is used for reducing The light beam formed by the light of the first wavelength band emitted by the first light source.
The light-emitting device according to claim 1, further comprising a second lens group, wherein the second lens group is located on an optical path from the second light source to the first optical path adjusting device, used for The light beam formed by the light of the second wavelength band emitted by the second light source is reduced.
The light-emitting device according to claim 1, further comprising a reflective element, the reflective element is located on an optical path between the second light source and the first optical path adjusting device, the reflective element has A transmission area and a reflection area, the transmission area allows the light of the second wavelength band to pass or transmit, and the reflection area is used to reflect the light of the second wavelength band from the first optical path adjusting device, and make the light in the second wavelength band At least part of the light is reflected back to the first optical path adjusting device.
The light-emitting device according to claim 16, further comprising a light guiding optical system, the light guiding optical system is located on the optical path from the second light source to the first optical path adjusting device, and is used for At least part of the light of the second wavelength band emitted by the second light source is guided to pass through or transmit through the transmission area of the reflective element and then enter the first optical path adjusting device.
The light-emitting device according to claim 1, further comprising a second scattering optical system, wherein the first optical path adjusting device partially transmits and transmits the light of the second wavelength band emitted by the second light source. Partially reflected and then emitted from different optical paths, the first scattering optical system receives the light of the second wavelength band emitted from one of the optical paths, and the dichroic mirror receives the light of the second wavelength band emitted from the other optical path , so that it is transmitted or reflected to the second scattering optical system, and the second scattering optical system reflects it and forms the scattered light of the second wavelength band; the dichroic mirror makes the light from the second scattering optical system The light of the second wavelength band of the two-scattering optical system is reflected or transmitted to the first optical path adjustment device, and the first optical path adjustment device transmits or reflects the light.
The light-emitting device according to claim 18, wherein the second scattering optical system is composed of a second reflective scattering plate, or a second transmissive scattering plate and a second reflecting mirror.
The light-emitting device according to claim 18, further comprising a third collecting optical system, wherein the third collecting optical system is located between the dichroic mirror and the second scattering optical system for light On the way, for condensing the light of the second wavelength band from the dichroic mirror toward the second scattering optical system, and for collecting the light of the second wavelength band from the second scattering optical system and make it shoot towards the dichroic mirror.
The light-emitting device according to claim 18, further comprising a second quarter-wave plate, wherein the second quarter-wave plate is located between the dichroic mirror and the second scattering on the optical path between optical systems.
A light-emitting device, characterized in that it includes a first light source, a second light source, a dichroic mirror, a wavelength conversion device, a second optical path adjustment device, and a first scattering optical system, wherein:

the first light source is used for emitting light of the first wavelength band;

the second light source is used for emitting light in a second wavelength band, and the second wavelength band is the same as or different from the first wavelength band;

The second light path adjusting device receives the light of the second wavelength band emitted by the second light source, and makes it at least partially transmit or at least partially reflect;

When the second optical path adjusting device at least partially transmits the light of the second wavelength band emitted by the second light source, the first scattering optical system receives the second light transmitted through the second optical path adjusting device The second wavelength band light is reflected to form scattered light of the second wavelength band; the second optical path adjusting device reflects at least part of the light of the second wavelength band from the first scattering optical system, and the second wavelength band light is passed through the second wavelength band. The light of the second wavelength band from the first scattering optical system reflected by the two optical path adjusting devices is directed to the dichroic mirror;

When the light of the second wavelength band emitted by the second light source is at least partially reflected by the second light path adjusting device, the first scattering optical system receives the light reflected from the second light path adjusting device The light of the second wavelength band is reflected to form scattered light of the second wavelength band; the second optical path adjusting device transmits at least part of the light of the second wavelength band from the first scattering optical system; transmission The light of the second wavelength band from the first scattering optical system passing through the second optical path adjusting device is directed to the dichroic mirror;

The dichroic mirror receives the light of the first wavelength band emitted by the first light source, and transmits or reflects it;

When the dichroic mirror transmits the light of the first wavelength band emitted by the first light source, the wavelength conversion device receives the light of the first wavelength band transmitted through the dichroic mirror, and converts it into converted into light in a third wavelength band different from both the first wavelength band and the second wavelength band; the dichroic mirror reflects the light in the third wavelength band from the wavelength conversion device; the dichroic mirror a mirror transmits the light of the second wavelength band from the second optical path adjusting device;

When the dichroic mirror reflects the light of the first wavelength band emitted by the first light source, the wavelength conversion device receives the light of the first wavelength band reflected from the dichroic mirror, converting it into light of a third wavelength band different from both the first wavelength band and the second wavelength band; the dichroic mirror transmits the light of the third wavelength band from the wavelength conversion device; the The dichroic mirror reflects the light of the second wavelength band from the second optical path adjusting device.
The light-emitting device according to claim 22, wherein the second optical path adjustment device is a second polarization beam splitter, and the second polarization beam splitter has the following characteristics with respect to the incident light of the second wavelength band: reflecting linearly polarized light of the second wavelength band having a first polarization direction and transmitting the linearly polarized light of the second wavelength band having a second polarization direction, wherein the first polarization direction is different from the second polarization direction.
The light-emitting device according to claim 22, further comprising a polarization conversion element, wherein the polarization conversion element is located on the optical path between the second optical path adjustment device and the first scattering optical system, and uses a When the light of the second wavelength band emitted from the second optical path adjustment device to the first scattering optical system is reflected by the first scattering optical system and returned to the second optical path adjustment device, its polarization Orientation or polarization state changes.
The light-emitting device according to claim 24, wherein the polarization conversion element is a first quarter wave plate.
The light-emitting device according to claim 22, wherein the first light source includes N first lasers and N first collimating elements corresponding to the N first lasers one-to-one, and N ≥1, where:

the first laser is used for emitting light in the first wavelength band;

The first collimating element is integrated in the first laser or disposed outside the first laser, and is used for collimating the light of the first wavelength band emitted by the first laser.
The light-emitting device according to claim 26, wherein the first light source further comprises a polarization selection element, and the polarization selection element is characterized by reflecting the S-polarized light of the first wavelength band and making the The P-polarized light of the first wavelength band is transmitted, and at least one of the first lasers in the first light source is used to emit the S-polarized light of the first wavelength band to form incident light 1, and the rest of the first laser in the first light source The first laser is used to emit the P-polarized light of the first wavelength band to form incident light 2, and the polarization selection element combines the incident light 1 and the incident light 2 into one light and then emits the light.
The light-emitting device according to claim 22, wherein the second light source includes M second lasers and M second collimating elements corresponding to the M second lasers one-to-one, and M ≥1, where:

the second laser is used for emitting light in the second wavelength band;

The second collimating element is integrated in the second laser or disposed outside the second laser, and is used for collimating the light of the second wavelength band emitted by the second laser.
The light-emitting device according to claim 22, wherein the first scattering optical system is composed of a first reflective scattering plate, or a first transmissive scattering plate and a first reflecting mirror.
The light-emitting device according to claim 22, further comprising a first collection optical system, the first collection optical system is located on the optical path between the dichroic mirror and the wavelength conversion device, is used for condensing the light of the first wavelength band from the dichroic mirror towards the wavelength conversion device, and at the same time for collecting the light of the third wavelength band from the wavelength conversion device and making it radiate to the wavelength conversion device. The dichroic mirror.
The light-emitting device according to claim 22, further comprising a second collection optical system, the second collection optical system being located between the second optical path adjusting device and the first scattering optical system On the optical path, for condensing the light of the second wavelength band from the second optical path adjusting device toward the first scattering optical system, and for collecting the second wavelength band from the first scattering optical system the light and make it radiate to the second optical path adjusting device.
The light-emitting device according to claim 22, further comprising a first uniform light optical system, wherein the first uniform light optical system is located on an optical path from the first light source to the dichroic mirror , which is used to uniformly emit the light of the first wavelength band from the first light source.
The light-emitting device according to claim 22, further comprising a second uniform light optical system, wherein the second uniform light optical system is located in the light from the second light source to the second light path adjusting device On the way, the light of the second wavelength band emitted by the second light source is uniform.
The light-emitting device according to claim 22, further comprising a condensing optical system for condensing the light emitted from the dichroic mirror.
The light-emitting device according to claim 22, further comprising a first lens group, wherein the first lens group is located on an optical path from the first light source to the dichroic mirror, and is used for reducing The light beam formed by the light of the first wavelength band emitted by the first light source.
The light-emitting device according to claim 22, further comprising a second lens group, the second lens group being located on the optical path from the second light source to the second optical path adjusting device, for The light beam formed by the light of the second wavelength band emitted by the second light source is reduced.
The light-emitting device according to claim 22, further comprising a reflective element, the reflective element is located on an optical path between the second light source and the second optical path adjusting device, the reflective element has A transmission area and a reflection area, the transmission area allows the light of the second wavelength band to pass or transmit, and the reflection area is used to reflect the light of the second wavelength band from the second optical path adjusting device, and make the light in the second wavelength band At least part of the light is reflected back to the second light path adjusting device.
The light-emitting device according to claim 37, further comprising a light guide optical system, the light guide optical system is located on the light path from the second light source to the second light path adjusting device, and is used for At least part of the light of the second wavelength band emitted by the second light source is guided to pass through or transmit through the transmission area of the reflective element and then enter the second optical path adjusting device.
The light-emitting device according to claim 22, further comprising a second scattering optical system, wherein the second optical path adjusting device partially transmits and transmits the light of the second wavelength band emitted by the second light source. After partial reflection, the light is emitted from different optical paths, the first scattering optical system receives the light of the second wavelength band emitted from one of the optical paths, and the second scattering optical system receives the light of the second wavelength band emitted from the other optical path. The second optical path adjusting device transmits or reflects the light of the second wavelength band from the second scattering optical system and then emits it to the two wavelengths. A dichroic mirror that transmits or reflects it.
The light-emitting device according to claim 39, wherein the second scattering optical system is composed of a second reflective scattering plate, or a second transmissive scattering plate and a second reflecting mirror.
The light-emitting device according to claim 39, further comprising a third collecting optical system, the third collecting optical system being located between the second optical path adjusting device and the second scattering optical system on the optical path, for condensing the light of the second wavelength band from the second optical path adjusting device toward the second scattering optical system, and for collecting the second wavelength band from the second scattering optical system the light and make it radiate to the second optical path adjusting device.
The light-emitting device according to claim 39, further comprising a second quarter-wave plate, wherein the second quarter-wave plate is located between the second optical path adjustment device and the second quarter-wave plate. On the light path between scattering optical systems.