A lighting device

Abstract

The present invention relates to an illumination device, characterized in that it comprises a first light source, a second light source, a first light path adjustment device, a second light path adjustment device or a third light path adjustment device, a wavelength conversion device, and a first scattering optical system. In the present invention, at least part of the light emitted by the first light source is used to excite the wavelength conversion device, and part of the light emitted by the second light source is also used to excite the wavelength conversion device. Therefore, compared with the prior art solution, the illumination device provided in the present invention can achieve a higher luminous flux output without increasing the optical etendue.

Description

Technical Field

[0001] The present invention belongs to the field of lighting, and in particular to the field of solid-state light source lighting. The present invention provides a lighting device that can be applied to systems that require high light intensity and small optical extension, such as entertainment lighting systems, projection systems, automotive lighting systems, medical lighting systems, searchlighting systems, field operation lighting systems, marine lighting systems, portable lighting systems, etc. Background Art

[0002] As an ideal point light source, laser has the advantages of small optical expansion, long life and no mercury. Using it as a light source to excite fluorescent materials can produce colored light or white light. At the same time, when used in conjunction with optical elements, an ideal lighting device with a small optical expansion can be obtained.

[0003] Figure 1 Schematic diagram of the structure of an existing polarization splitting lighting device. Figure 1 As shown, the existing lighting device includes a light source 101, a quarter wave plate 102, a polarization beam splitter 103, a lens group 104 (including a lens 104a and a lens 104b), a wavelength conversion device 105 (including a reflection layer 105a and a wavelength conversion layer 105b), a quarter wave plate 106, a lens group 107 (including a lens 107a and a lens 107b), a reflective scattering plate 108, and a focusing lens 109. 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 by one, and the laser 101a emits S-polarized blue light.

[0004] The characteristic of the polarization beam splitter 103 is 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 polarization beam splitter 103 also transmits the yellow light. The blue light of the S polarized light emitted by the light source 101 is transmitted through the quarter wave plate 102 and converted into a blue light mixed with the S polarized light component and the P polarized light component in a specified ratio, and then enters the polarization beam splitter 103. The polarization beam splitter 103 separates it into 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 and transmits the blue light of the P polarized light. Among them, the blue light of the S polarized light reflected by the polarization beam splitter 103 is directed to the lens group 104, and the blue light of the P polarized light transmitted through the polarization beam splitter 103 is directed to the quarter wave plate 106. The lens group 104 converges the blue light of the S polarized light toward the wavelength conversion device 105. The wavelength conversion device 105 is reflective, and includes a reflective layer 105a and a wavelength conversion layer 105b (e.g., a yellow phosphor layer) disposed on the reflective layer 105a. The wavelength conversion device 105 converts the S-polarized blue light into yellow light and directs it toward the lens group 104. The yellow light is collected by the lens group 104 and then directed toward the polarization beam splitter 103. The polarization beam splitter 103 transmits the yellow light. The P-polarized blue light is converted into circularly polarized blue light after passing through the quarter-wave plate 106. The lens group 107 converges the circularly polarized blue light toward the reflective scattering plate 108. The circularly polarized blue light is reflected by the reflective scattering plate 108 and then directed toward the lens group 107. Then, the circularly polarized blue light is collected by the lens group 107 and then directed toward the quarter-wave plate 106. The circularly polarized blue light is converted into S-polarized blue light after passing through the quarter wave plate 106. The S-polarized blue light is directed toward the polarization beam splitter 103, and the polarization beam splitter 103 reflects the S-polarized blue light. The yellow light passing through the polarization beam splitter 103 and the S-polarized blue light reflected by the polarization beam splitter 103 are combined into a mixed light, and the mixed light of the yellow light and the blue light is white light. Finally, the focusing lens 109 converges the white light and emits it from the lighting device.

[0005] exist Figure 1 In the scheme shown, if the output of the luminous flux of the lighting device needs to be significantly improved, it is necessary to increase the number of lasers 101a in the light source 101, but this will increase the optical expansion of the entire lighting device, thereby failing to meet some application fields that require a small optical expansion, such as: entertainment lighting systems, projection systems, etc. Summary of the invention

[0006] The object of the present invention is to achieve a higher luminous flux output without increasing the optical etendue.

[0007] In order to achieve the above object, a technical solution of the present invention is to provide an illumination device, characterized in that it includes a first light source, a second light source, a first light path adjustment device, a second light path adjustment device, a wavelength conversion device and a first scattering optical system, wherein:

[0008] The first light source is used to emit light in a first wavelength band;

[0009] The second light source is used to emit light of a second wavelength band, and the second wavelength band is the same as or different from the first wavelength band;

[0010] The first optical path adjustment device receives the light of the first wavelength band emitted from the first light source and causes the light to be at least partially transmitted or at least partially reflected;

[0011] When the first optical path adjusting device causes the light of the first wavelength band emitted by the first light source to at least partially transmit, the first optical path adjusting device receives the light of the second wavelength band from the second optical path adjusting device and reflects it, the wavelength conversion device receives the light of the first wavelength band transmitted through the first optical path adjusting device and the light of the second wavelength band reflected by the first optical path adjusting device, converts the light of the first wavelength band into a first converted light whose wavelength band is different from the first wavelength band, and converts the light of the second wavelength band into a second converted light whose wavelength band is different from the second wavelength band; the first optical path adjusting device reflects the first converted light and the second converted light from the wavelength conversion device, and the first converted light and the second converted light are emitted toward the second optical path adjusting device;

[0012] When the first optical path adjusting device causes the light of the first wavelength band emitted by the first light source to at least partially reflect, the first optical path adjusting device receives the light of the second wavelength band from the second optical path adjusting device and transmits it, the wavelength conversion device receives the light of the first wavelength band reflected by the first optical path adjusting device and the light of the second wavelength band transmitted through the first optical path adjusting device, converts the light of the first wavelength band into a first converted light whose wavelength band is different from the first wavelength band, and converts the light of the second wavelength band into a second converted light whose wavelength band is different from the second wavelength band; the first optical path adjusting device causes the first converted light and the second converted light from the wavelength conversion device to transmit, and the first converted light and the second converted light are emitted toward the second optical path adjusting device;

[0013] The second optical path adjusting device receives the light of the second wavelength band emitted from the second light source, makes it partially transmitted and partially reflected, and then emits from a different optical path; the first optical path adjusting device receives the light of the second wavelength band emitted from one of the optical paths; the first scattering optical system receives the light of the second wavelength band emitted from the other optical path, reflects it and forms scattered light of the second wavelength band; the second optical path adjusting device combines the first converted light and the second converted light from the first optical path adjusting device with at least part of the photosynthetic light of the second wavelength band from the first scattering optical system, and emits them from the same optical path.

[0014] In the above technical solution, the wavelength conversion device is reflective, which can be static or dynamic:

[0015] The static wavelength conversion device includes a reflective layer and a wavelength conversion layer arranged on the reflective layer, wherein the wavelength conversion layer absorbs incident light of a first wavelength band and emits a first converted light after being excited, and absorbs incident light of a second wavelength band and emits a second converted light after being excited.

[0016] The dynamic wavelength conversion device is a rotatable fluorescent wheel, which includes a reflective layer and a wavelength conversion layer arranged on the reflective layer, wherein the wavelength conversion layer absorbs the incident light of the first wavelength band and emits the first converted light after being excited, and absorbs the incident light of the second wavelength band and emits the second converted light after being excited.

[0017] It should be noted that: if two or more different wavelength conversion layers are provided on the reflective layers of different sectors of the fluorescent wheel, each wavelength conversion layer absorbs the incident light of the first wavelength band and emits converted light of different wavelength bands after being excited. At this time, the combined light of the converted light of different wavelength bands should be regarded as the first converted light; similarly, each wavelength conversion layer absorbs the incident light of the second wavelength band and emits converted light of different wavelength bands after being excited. At this time, the combined light of the converted light of different wavelength bands should also be regarded as the second converted light.

[0018] Preferably, the first optical path adjustment 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 first wavelength band and the second wavelength band: reflects the S polarized light of the first wavelength band and the second wavelength band and transmits the P polarized light of the first wavelength band and the second wavelength band; the first polarization beam splitter has the following second characteristic with respect to the first converted light and the second converted light: transmits or reflects the first converted light and the second converted light.

[0019] In the above technical solution, the first polarization beam splitter is a flat-plate polarization beam splitter or a cubic polarization beam splitter.

[0020] Preferably, the second optical path adjustment device is a second polarization beam splitter, and the second polarization beam splitter has the following first characteristic with respect to the incident light of the second wavelength band: reflecting the S polarized light of the second wavelength band and transmitting the P polarized light of the second wavelength band; the second polarization beam splitter has the following second characteristic with respect to the first converted light and the second converted light: transmitting or reflecting the first converted light and the second converted light.

[0021] In the above technical solution, the second polarization beam splitter is a flat-plate polarization beam splitter or a cubic polarization beam splitter.

[0022] Preferably, it further comprises a first quarter wave plate, wherein the first quarter wave plate is located on the optical path between the second optical path adjusting device and the first scattering optical system.

[0023] Preferably, it further comprises a half-wave plate, wherein the half-wave plate is located on the optical path between the first optical path adjusting device and the second optical path adjusting device.

[0024] Preferably, the first light source includes N first lasers and N first collimating elements corresponding to the N first lasers one by one, N≥1, wherein:

[0025] The first laser is used to emit light in the first wavelength band;

[0026] The first collimating element is integrated into the first laser or arranged outside the first laser, and is used for collimating the light of the first wavelength band emitted by the first laser.

[0027] In the above technical solution, the first collimating element can be integrated inside the first laser. When the first laser used does not have the first collimating element integrated inside, a first collimating element (such as a collimating lens) can also be added outside the first laser to collimate the light emitted by the first laser.

[0028] In addition to the first laser and the first collimating element mentioned in the above technical solution, the first light source may also include other optical elements (such as reflectors), which can be used to collect light emitted from the first laser and ultimately form light of the first wavelength band emitted by the first light source.

[0029] Preferably, the second light source comprises M second lasers and M second collimating elements corresponding one-to-one to the M second lasers, M≥1, wherein:

[0030] The second laser is used to emit light in the second wavelength band;

[0031] The second collimating element is integrated into the second laser or arranged outside the second laser, and is used for collimating the light of the second wavelength band emitted by the second laser.

[0032] In the above technical solution, the second collimating element can be integrated inside the second laser. When the second laser used does not have the second collimating element integrated inside, a second collimating element (such as a collimating lens) can also be added outside the second laser to collimate the light emitted by the second laser.

[0033] In addition to the second laser and the second collimating element mentioned in the above technical solution, the second light source may also include other optical elements (such as reflectors), which can be used to collect light emitted from the second laser and ultimately form light of the second wavelength band emitted by the second light source.

[0034] Preferably, the light in the second wavelength band emitted by the second laser is linearly polarized light, wherein:

[0035] The light emission directions of all the second lasers are the same, and the initial polarization directions of the light emitted by all the second lasers are also the same. Taking the light emission direction of the second laser as the axis, a part of the second lasers in the second light source is axially rotated to change the polarization direction of the light of the second wavelength band emitted by this part of the second lasers, so that when the light of the second wavelength band emitted by the second light source enters the second optical path adjustment device, it contains an S polarized light component and a P polarized light component;

[0036] Alternatively, the light emission directions and polarization directions of all the second lasers are the same, and the second light source is axially rotated with the light emission direction of the second laser as the axis, so that when the light of the second wavelength band emitted by the second light source is incident on the second optical path adjustment device, it contains S polarized light components and P polarized light components;

[0037] Alternatively, the light emission directions of all the second lasers are the same, the polarization directions of the light emitted by all the second lasers are also the same, a wave plate is arranged in the second light source, and the polarization direction or polarization state of the light of the second wavelength band emitted by all or part of the second lasers in the second light source is changed by the wave plate, so that when the light of the second wavelength band emitted by the second light source is incident on the second optical path adjustment device, it contains an S polarized light component and a P polarized light component;

[0038] Or it further includes a polarization selection element, the characteristic of which is to reflect the S polarized light of the second band and transmit the P polarized light of the second band, at least one of the second lasers in the second light source is used to emit the S polarized light of the second band to form incident light one, and the remaining second lasers in the second light source are used to emit the P polarized light of the second band to form incident light two, and the incident light one and the incident light two are combined into one light by the polarization selection element and then emitted, so that when the light of the second band emitted by the second light source is incident on the second optical path adjustment device, it contains S polarized light components and P polarized light components.

[0039] 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.

[0040] In the above technical solution, the first reflective scattering plate may be a static or a dynamic rotatable first reflective scattering plate.

[0041] Preferably, it also includes a first collecting optical system, which is located on the optical path between the first optical path adjusting device and the wavelength conversion device, and is used to converge the light of the first wavelength band and the light of the second wavelength band from the first optical path adjusting device toward the wavelength conversion device, and at the same time to collect the first converted light and the second converted light from the wavelength conversion device and direct them toward the first optical path adjusting device.

[0042] In the above technical solution, the first collecting optical system can be composed of a lens, a lens group, a compound parabolic concentrator or a conical light guide column alone, or can be composed of any combination of the above-mentioned optical elements.

[0043] Preferably, it also includes a second collecting optical system, which is located on the optical path between the second optical path adjusting device and the first scattering optical system, and is used to converge the light of the second wavelength band from the second optical path adjusting device toward the first scattering optical system, and at the same time to collect the light of the second wavelength band from the first scattering optical system and direct it toward the second optical path adjusting device.

[0044] In the above technical solution, the second collecting optical system can be composed of a lens, a lens group, a compound parabolic concentrator or a conical light guide column alone, or can be composed of any combination of the above-mentioned optical elements.

[0045] Preferably, it further comprises a first light homogenizing optical system, which is located on the optical path from the first light source to the first light path adjusting device and is used for homogenizing the light of the first wavelength band emitted by the first light source.

[0046] In the above technical solution, the first light homogenizing optical system may be composed of a diffuser, an optical integrator rod, or at least one fly-eye lens array, wherein the optical integrator rod may be solid or hollow. In addition, since the use of a diffuser will diffuse the light of the first wavelength band emitted by the first light source, a positive lens may be arranged on the optical path from the first light source to the diffuser or from the diffuser to the first optical path adjusting device to converge the light of the first wavelength band emitted from the first light source to the wavelength conversion system.

[0047] Preferably, it further comprises a second light homogenizing optical system, which is located on the optical path from the second light source to the second light path adjusting device and is used for homogenizing the light of the second wavelength band emitted by the second light source.

[0048] In the above technical solution, the second light homogenization optical system can be composed of a diffuser, an optical integrator rod, or at least one fly-eye lens array, wherein the optical integrator rod can be solid or hollow. In addition, since the use of a diffuser will diffuse the light of the second wavelength band emitted by the second light source, a positive lens can be arranged on the optical path from the second light source to the diffuser or from the diffuser to the second optical path adjustment device to converge the light of the second wavelength band emitted from the second light source to the optical path adjustment system.

[0049] Preferably, it also includes a focusing optical system for converging the light emitted from the second optical path adjusting device.

[0050] In the above technical solution, the focusing optical system can be composed of one or more lenses.

[0051] Preferably, it further comprises a first lens group, which is located on the optical path from the first light source to the first optical path adjusting device and is used to reduce the light beam formed by the light of the first wavelength band emitted by the first light source.

[0052] Preferably, it further comprises a second lens group, which is located on the optical path from the second light source to the second optical path adjusting device and is used for reducing the light beam formed by the light of the second wavelength band emitted by the second light source.

[0053] Preferably, it also includes a reflective element, which is located on the optical path between the second light source and the second optical path adjusting device, and has a transmission area and a reflection area, the transmission area allows the light of the second wavelength band to pass or transmit through, and the reflection area is used to reflect the light of the second wavelength band from the second optical path adjusting device and make at least part of the light therein reflected back to the second optical path adjusting device.

[0054] In the above technical solution, the reflective element can be planar or non-planar. The transmission area of ​​the reflective element can be a light-through hole or a light-transmitting structure composed of a light-transmitting material. The reflective element can also be a transmissive diffuser plate with a reflective film coated 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 that is coated with the reflective film is the reflective area.

[0055] Preferably, it also includes a light-guiding optical system, which is located on the optical path from the second light source to the second optical path adjusting device, and is used to guide at least part of the light of the second wavelength band emitted by the second light source to pass through or transmit through the transmission area of ​​the reflective element and then be incident on the second optical path adjusting device.

[0056] In the above technical solution, the light-guiding optical system can be composed of a lens, a compound parabolic concentrator or a light-guiding column alone, or can be composed of any combination of the above-mentioned optical elements. And the number of lenses, compound parabolic concentrators, and light-guiding columns is determined according to needs, and can be 1, 2, or more than 2. Among them, the light-guiding column can be solid or hollow, and the end face of the light-guiding column can be a plane or a non-plane.

[0057] Preferably, it also includes a second scattering optical system, the first optical path adjusting device makes the light of the first wavelength band emitted by the first light source partially transmitted and partially reflected and then emitted from different optical paths, the wavelength conversion device receives the light of the first wavelength band emitted from one of the optical paths, and the second scattering optical system receives the light of the first wavelength band emitted from another optical path, reflects it and forms scattered light of the first wavelength band; the first optical path adjusting device combines the first converted light and the second converted light from the wavelength conversion device with at least part of the photosynthetic light of the first wavelength band from the second scattering optical system and emits them to the second optical path adjusting device, and the second optical path adjusting device combines the first converted light, the second converted light and the light of the first wavelength band from the first optical path adjusting device with at least part of the photosynthetic light of the second wavelength band from the first scattering optical system and emits them from the same optical path.

[0058] 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.

[0059] In the above technical solution, the second reflective scattering plate may be a static or a dynamic rotatable second reflective scattering plate.

[0060] Preferably, it also includes a third collecting optical system, which is located on the optical path between the first optical path adjusting device and the second scattering optical system, and is used to converge the light of the first wavelength band from the first optical path adjusting device toward the second scattering optical system, and at the same time to collect the light of the first wavelength band from the second scattering optical system and direct it toward the first optical path adjusting device.

[0061] In the above technical solution, the third collecting optical system can be composed of a lens, a lens group, a compound parabolic concentrator or a conical light guide column alone, or can be composed of any combination of the above-mentioned optical elements.

[0062] Preferably, it further comprises a second quarter wave plate, wherein the second quarter wave plate is located on the optical path between the first optical path adjusting device and the second scattering optical system.

[0063] Another technical solution of the present invention is to provide an illumination device, characterized in that it includes a first light source, a second light source, a first light path adjustment device, a third light path adjustment device, a wavelength conversion device and a first scattering optical system, wherein:

[0064] The first light source is used to emit light in a first wavelength band;

[0065] The second light source is used to emit light of a second wavelength band, and the second wavelength band is the same as or different from the first wavelength band;

[0066] The third optical path adjustment device receives the light of the second wavelength band emitted from the second light source, and transmits part of it and reflects part of it, and then emits it from different optical paths; the wavelength conversion device receives the light of the second wavelength band emitted from one of the optical paths, and converts it into a second converted light, and the wavelength band of the second converted light is different from the second wavelength band; the first scattering optical system receives the light of the second wavelength band emitted from another optical path, and reflects it to form scattered light of the second wavelength band; the third optical path adjustment device also receives the light of the first wavelength band from the first optical path adjustment device, and transmits or reflects it before being received by the wavelength conversion device, and the wavelength conversion device converts it into a first converted light, and the wavelength band of the first converted light is different from the first wavelength band; the third optical path adjustment device combines the first converted light and the second converted light from the wavelength conversion device with at least part of the light of the second wavelength band from the first scattering optical system, and then emits them from the same optical path, and the combined light is emitted toward the first optical path adjustment device;

[0067] The first optical path adjustment device receives the light of the first wavelength band emitted from the first light source and causes the light to be at least partially transmitted or at least partially reflected;

[0068] When the first optical path adjusting device causes the light of the first wavelength band emitted by the first light source to at least partially transmit, the light of the first wavelength band transmitted through the first optical path adjusting device is emitted toward the third optical path adjusting device; the first optical path adjusting device receives the combined light of the first converted light, the second converted light, and the light of the second wavelength band from the third optical path adjusting device and reflects it;

[0069] When the first optical path adjusting device causes the light of the first wavelength band emitted by the first light source to at least partially reflect, the light of the first wavelength band reflected by the first optical path adjusting device is emitted to the third optical path adjusting device; the first optical path adjusting device receives the combined light of the first converted light, the second converted light and the light of the second wavelength band from the third optical path adjusting device and transmits it.

[0070] In the above technical solution, the wavelength conversion device is reflective, which can be static or dynamic:

[0071] The static wavelength conversion device includes a reflective layer and a wavelength conversion layer arranged on the reflective layer, wherein the wavelength conversion layer absorbs incident light of a first wavelength band and emits a first converted light after being excited, and absorbs incident light of a second wavelength band and emits a second converted light after being excited.

[0072] The dynamic wavelength conversion device is a rotatable fluorescent wheel, which includes a reflective layer and a wavelength conversion layer arranged on the reflective layer, wherein the wavelength conversion layer absorbs the incident light of the first wavelength band and emits the first converted light after being excited, and absorbs the incident light of the second wavelength band and emits the second converted light after being excited.

[0073] It should be noted that: if two or more different wavelength conversion layers are provided on the reflective layers of different sectors of the fluorescent wheel, each wavelength conversion layer absorbs the incident light of the first wavelength band and emits converted light of different wavelength bands after being excited. At this time, the combined light of the converted light of different wavelength bands should be regarded as the first converted light; similarly, each wavelength conversion layer absorbs the incident light of the second wavelength band and emits converted light of different wavelength bands after being excited. At this time, the combined light of the converted light of different wavelength bands should also be regarded as the second converted light.

[0074] Preferably, the first optical path adjustment 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 first wavelength band and the second wavelength band: reflects the S polarized light of the first wavelength band and the second wavelength band and transmits the P polarized light of the first wavelength band and the second wavelength band; the first polarization beam splitter has the following second characteristic with respect to the first converted light and the second converted light: transmits or reflects the first converted light and the second converted light.

[0075] In the above technical solution, the first polarization beam splitter is a flat-plate polarization beam splitter or a cubic polarization beam splitter.

[0076] Preferably, the third optical path adjustment device is a third polarization beam splitter, and the third polarization beam splitter has the following first characteristic with respect to the incident light of the first band and the second band: it reflects the S polarized light of the first band and the second band and transmits the P polarized light of the first band and the second band; and the third polarization beam splitter has the following second characteristic with respect to the first converted light and the second converted light: it transmits or reflects the first converted light and the second converted light.

[0077] In the above technical solution, the third polarization beam splitter is a flat-plate polarization beam splitter or a cubic polarization beam splitter.

[0078] Preferably, it further comprises a first quarter wave plate, wherein the first quarter wave plate is located on the optical path between the third optical path adjusting device and the first scattering optical system.

[0079] Preferably, it further comprises a half-wave plate, wherein the half-wave plate is located on the optical path between the first optical path adjusting device and the third optical path adjusting device.

[0080] Preferably, the first light source includes N first lasers and N first collimating elements corresponding to the N first lasers one by one, N≥1, wherein:

[0081] The first laser is used to emit light in the first wavelength band;

[0082] The first collimating element is integrated into the first laser or arranged outside the first laser, and is used for collimating the light of the first wavelength band emitted by the first laser.

[0083] In the above technical solution, the first collimating element can be integrated inside the first laser. When the first laser used does not have the first collimating element integrated inside, a first collimating element (such as a collimating lens) can also be added outside the first laser to collimate the light emitted by the first laser.

[0084] In addition to the first laser and the first collimating element mentioned in the above technical solution, the first light source may also include other optical elements (such as reflectors), which can be used to collect light emitted from the first laser and ultimately form light of the first wavelength band emitted by the first light source.

[0085] Preferably, the second light source comprises M second lasers and M second collimating elements corresponding one-to-one to the M second lasers, M≥1, wherein:

[0086] The second laser is used to emit light in the second wavelength band;

[0087] The second collimating element is integrated into the second laser or arranged outside the second laser, and is used for collimating the light of the second wavelength band emitted by the second laser.

[0088] In the above technical solution, the second collimating element can be integrated inside the second laser. When the second laser used does not have the second collimating element integrated inside, a second collimating element (such as a collimating lens) can also be added outside the second laser to collimate the light emitted by the second laser.

[0089] In addition to the second laser and the second collimating element mentioned in the above technical solution, the second light source may also include other optical elements (such as reflectors), which can be used to collect light emitted from the second laser and ultimately form light of the second wavelength band emitted by the second light source.

[0090] Preferably, the light in the second wavelength band emitted by the second laser is linearly polarized light, wherein:

[0091] The light emission directions of all the second lasers are the same, and the initial polarization directions of the light emitted by all the second lasers are also the same. Taking the light emission direction of the second laser as the axis, a part of the second lasers in the second light source is axially rotated to change the polarization direction of the light of the second wavelength band emitted by this part of the second lasers, so that when the light of the second wavelength band emitted by the second light source enters the third optical path adjustment device, it contains an S polarized light component and a P polarized light component;

[0092] Alternatively, the light emission directions of all the second lasers are the same, the polarization directions of the light emitted by all the second lasers are also the same, and the second light source is axially rotated with the light emission direction of the second laser as the axis, so that when the light of the second wavelength band emitted by the second light source is incident on the third optical path adjustment device, it contains an S polarized light component and a P polarized light component;

[0093] Alternatively, all the second lasers have the same light emission direction, a wave plate is provided in the second light source, and the polarization direction or polarization state of the light in the second wavelength band emitted by all or part of the second lasers in the second light source is changed by the wave plate, so that when the light in the second wavelength band emitted by the second light source enters the third optical path adjustment device, it contains an S polarized light component and a P polarized light component;

[0094] Or it also includes a polarization selection element, the characteristic of which is to reflect the S polarized light of the second band and transmit the P polarized light of the second band, at least one of the second lasers in the second light source is used to emit the S polarized light of the second band to form incident light one, and the remaining second lasers in the second light source are used to emit the P polarized light of the second band to form incident light two, and the incident light one and the incident light two are combined into one light by the polarization selection element and then emitted, so that when the light of the second band emitted by the second light source is incident on the third optical path adjustment device, it contains S polarized light components and P polarized light components.

[0095] 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.

[0096] In the above technical solution, the first reflective scattering plate may be a static or a dynamic rotatable first reflective scattering plate.

[0097] Preferably, it also includes a first collecting optical system, which is located on the optical path between the third optical path adjusting device and the wavelength conversion device, and is used to converge the light of the first wavelength band and the light of the second wavelength band from the third optical path adjusting device toward the wavelength conversion device, and at the same time to collect the first converted light and the second converted light from the wavelength conversion device and direct them toward the third optical path adjusting device.

[0098] In the above technical solution, the first collecting optical system can be composed of a lens, a lens group, a compound parabolic concentrator or a conical light guide column alone, or can be composed of any combination of the above-mentioned optical elements.

[0099] Preferably, it also includes a second collecting optical system, which is located on the optical path between the third optical path adjusting device and the first scattering optical system, and is used to converge the light of the second wavelength band from the third optical path adjusting device toward the first scattering optical system, and at the same time to collect the light of the second wavelength band from the first scattering optical system and direct it toward the third optical path adjusting device.

[0100] In the above technical solution, the second collecting optical system can be composed of a lens, a lens group, a compound parabolic concentrator or a conical light guide column alone, or can be composed of any combination of the above-mentioned optical elements.

[0101] Preferably, it further comprises a first light homogenizing optical system, which is located on the optical path from the first light source to the first light path adjusting device and is used for homogenizing the light of the first wavelength band emitted by the first light source.

[0102] In the above technical solution, the first light homogenizing optical system may be composed of a diffuser, an optical integrator rod, or at least one fly-eye lens array, wherein the optical integrator rod may be solid or hollow. In addition, since the use of a diffuser will diffuse the light of the first wavelength band emitted by the first light source, a positive lens may be arranged on the optical path from the first light source to the diffuser or from the diffuser to the first optical path adjusting device to converge the light of the first wavelength band emitted from the first light source to the wavelength conversion system.

[0103] Preferably, it further comprises a second light homogenizing optical system, which is located on the optical path from the second light source to the third optical path adjusting device and is used for homogenizing the light of the second wavelength band emitted by the second light source.

[0104] In the above technical solution, the second light homogenization optical system can be composed of a diffuser, an optical integrator rod or at least one fly-eye lens array, wherein the optical integrator rod can be solid or hollow. In addition, since the use of a diffuser will diffuse the light of the second wavelength band emitted by the second light source, a positive lens can be arranged on the optical path from the second light source to the diffuser or from the diffuser to the third optical path adjustment device to converge the light of the second wavelength band emitted from the second light source to the optical path adjustment system.

[0105] Preferably, it also includes a focusing optical system for converging the light emitted from the first optical path adjusting device.

[0106] In the above technical solution, the focusing optical system can be composed of one or more lenses.

[0107] Preferably, it further comprises a first lens group, which is located on the optical path from the first light source to the first optical path adjusting device and is used to reduce the light beam formed by the light of the first wavelength band emitted by the first light source.

[0108] Preferably, it further comprises a second lens group, which is located on the optical path from the second light source to the third optical path adjusting device and is used to reduce the light beam formed by the light of the second wavelength band emitted by the second light source.

[0109] Preferably, it also includes a reflective element, which is located on the optical path between the second light source and the third optical path adjusting device, and has a transmission area and a reflection area, the transmission area allows the light of the second wavelength band to pass or transmit through, and the reflection area is used to reflect the light of the second wavelength band from the third optical path adjusting device and make at least part of the light therein reflected back to the third optical path adjusting device.

[0110] In the above technical solution, the reflective element can be planar or non-planar. The transmission area of ​​the reflective element can be a light-through hole or a light-transmitting structure composed of a light-transmitting material. The reflective element can also be a transmissive diffuser plate with a reflective film coated 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 that is coated with the reflective film is the reflective area.

[0111] Preferably, it also includes a light-guiding optical system, which is located on the optical path from the second light source to the third optical path adjusting device, and is used to guide at least part of the light of the second wavelength band emitted by the second light source to pass through or transmit through the transmission area of ​​the reflective element and then be incident on the third optical path adjusting device.

[0112] In the above technical solution, the light-guiding optical system can be composed of a lens, a compound parabolic concentrator or a light-guiding column alone, or can be composed of any combination of the above-mentioned optical elements. And the number of lenses, compound parabolic concentrators, and light-guiding columns is determined according to needs, and can be 1, 2, or more than 2. Among them, the light-guiding column can be solid or hollow, and the end face of the light-guiding column can be a plane or a non-plane.

[0113] Preferably, it also includes a second scattering optical system, the first optical path adjusting device makes the light of the first wavelength band emitted by the first light source partially transmitted and partially reflected and then emitted from a different optical path, the third optical path adjusting device receives the light of the first wavelength band emitted from one of the optical paths, and the second scattering optical system receives the light of the first wavelength band emitted from the other optical path, reflects it and forms scattered light of the first wavelength band; the first optical path adjusting device combines the first converted light, the second converted light and the light of the second wavelength band from the third optical path adjusting device with at least part of the light of the first wavelength band from the second scattering optical system and emits them from the same optical path.

[0114] 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.

[0115] In the above technical solution, the second reflective scattering plate may be a static or a dynamic rotatable second reflective scattering plate.

[0116] Preferably, it also includes a third collecting optical system, which is located on the optical path between the first optical path adjusting device and the second scattering optical system, and is used to converge the light of the first wavelength band from the first optical path adjusting device toward the second scattering optical system, and at the same time to collect the light of the first wavelength band from the second scattering optical system and direct it toward the first optical path adjusting device.

[0117] In the above technical solution, the third collecting optical system can be composed of a lens, a lens group, a compound parabolic concentrator or a conical light guide column alone, or can be composed of any combination of the above-mentioned optical elements.

[0118] Preferably, it further comprises a second quarter wave plate, wherein the second quarter wave plate is located on the optical path between the first optical path adjusting device and the second scattering optical system.

[0119] Those skilled in the art may also provide a heat sink for dissipating heat of the first light source and / or the second light source and / or the wavelength conversion device as required.

[0120] In the present invention, at least part of the light emitted by the first light source is used to excite the wavelength conversion device, and part of the light emitted by the second light source is also used to excite the wavelength conversion device. Therefore, compared with the prior art solutions, the lighting device provided in the present invention can achieve a higher luminous flux output without increasing the optical extension.

[0121] The lighting device of the present invention has the characteristics of high brightness, small optical expansion, high color rendering index, long working life, etc., and can be applied to systems requiring high light intensity and small optical expansion, such as entertainment lighting systems, projection systems, automotive lighting systems, medical lighting systems, searchlight lighting systems, field work lighting systems, marine lighting systems, portable lighting systems, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0122] Figure 1 It is a schematic diagram of the structure of an existing polarization splitting lighting device;

[0123] Figure 2 is a schematic structural diagram of a first light source used in the embodiment;

[0124] Figures 3 to 9 Several different structural forms of the second light source are schematically shown;

[0125] Fig.10 is a schematic structural diagram of a static wavelength conversion device;

[0126] Fig.11 is a schematic diagram of a first structural form of a dynamic wavelength conversion device;

[0127] Fig.12 is a schematic diagram of a second structural form of a dynamic wavelength conversion device;

[0128] Fig.13 This is a schematic structural diagram of a lighting device disclosed in Example 1;

[0129] Fig.14This is a schematic structural diagram of a lighting device disclosed in Example 2;

[0130] Fig.15 This is a schematic structural diagram of a lighting device disclosed in Example 3;

[0131] Fig.16 This is a schematic diagram of the structure of a lighting device disclosed in Example 4;

[0132] Fig.17 This is a schematic diagram of the structure of a lighting device disclosed in Example 5;

[0133] Fig.18 This is a schematic structural diagram of a lighting device disclosed in Example 6;

[0134] Fig.19 This is a schematic structural diagram of a lighting device disclosed in Example 7;

[0135] Fig. 20 This is a schematic structural diagram of a lighting device disclosed in Example 8;

[0136] Fig.21 This is a schematic structural diagram of a lighting device disclosed in Example 9;

[0137] Fig. 22 is a schematic structural diagram of a lighting device disclosed in Example 10;

[0138] Fig.23 is a schematic structural diagram of a lighting device disclosed in Example 11;

[0139] Fig.24 is a schematic structural diagram of a lighting device disclosed in Example 12;

[0140] Fig.25 is a schematic structural diagram of a lighting device disclosed in Example 13;

[0141] Fig.26 is a schematic structural diagram of a lighting device disclosed in Example 14;

[0142] Fig. 27 This is a schematic structural diagram of a lighting device disclosed in Example 15;

[0143] Fig.28 is a schematic structural diagram of a lighting device disclosed in Example 16;

[0144] Fig.29 is a schematic structural diagram of a lighting device disclosed in Example 17;

[0145] Fig.30 is a schematic structural diagram of a lighting device disclosed in Example 18;

[0146] Fig.31 Schematic structural diagram of a lighting device disclosed in Embodiment 19;

[0147] Fig.32 Schematic structural diagram of a lighting device disclosed in Embodiment 20. Detailed implementation manners

[0148] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments 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 this application.

[0149] Any lighting device disclosed in all the following embodiments can adopt the first light source as shown in Figure 2 the figure.

[0150] As shown in Figure 2 the figure, the first light source 201 includes N lasers 201a and N collimating elements 201b corresponding to the N lasers 201a one by one, where N≥1. All the lasers 201a emit linearly polarized light.

[0151] Any lighting device disclosed in all the following embodiments can adopt the second light source as shown in Figure 3 , 4 , 5, 6, 7, 8 or 9.

[0152] Figure 3 Schematic structural diagram of the second light source of the first solution. As shown in Figure 3 the figure, the second light source 301 includes M lasers 301a and M collimating elements 301b corresponding to the M lasers 301a one by one, where M≥2. All the lasers 301a emit linearly polarized light and the polarization directions of the linearly polarized light emitted by all the lasers 301a are the same, and the light-emitting directions of all the lasers 301a are also the same. One or more half-wave plates 301c are arranged in front of the m lasers 301a, where 1≤m<M, for changing the polarization direction of the linearly polarized light emitted by the m lasers 301a. Adopting the structure shown in Figure 3 the figure can make the light emitted by the second light source 301 enter the second light path adjusting device or the third light path adjusting device of any lighting device in all the following embodiments, and it contains S polarization light components and P polarization light components.

[0153] Figure 4 Schematic structural diagram of the second light source of the second solution. As shown in Figure 4As shown in the figure, the second light source 401 includes M lasers 401a and M collimating elements 401b corresponding to the M lasers 401a one by one, where M≥1. All the lasers 401a emit linearly polarized light and the polarization directions of the linearly polarized light emitted by all the lasers 401a are the same, and the light-emitting directions of all the lasers 401a are also the same. A quarter-wave plate 401c is arranged in front of all the lasers 401a. Using Figure 4 the structure shown can make the light emitted by the second light source 401 contain S-polarized light components and P-polarized light components when it is incident on the second optical path adjusting device or the third optical path adjusting device of any lighting device in all the following embodiments.

[0154] Figure 5 is a schematic structural diagram of the second light source of the third solution. As Figure 5 shown, the second light source 501 includes M lasers 501a and M collimating elements 501b corresponding to the M lasers 501a one by one, where M≥2. All the lasers 501a emit linearly polarized light and the initial polarization directions of the linearly polarized light emitted by all the lasers 501a are the same, and the light-emitting directions of all the lasers 501a are also the same. Taking the light-emitting direction of the laser 501a as the axis, m lasers 501a among the M lasers 501a are axially rotated, where 1≤m<M, to change the polarization direction of the linearly polarized light emitted by the m lasers 5011 (for example, changing from S-polarized light to P-polarized light, or from P-polarized light to S-polarized light). Using Figure 5 the structure shown can make the light emitted by the second light source 501 contain S-polarized light components and P-polarized light components when it is incident on the second optical path adjusting device or the third optical path adjusting device of any lighting device in all the following embodiments.

[0155] Figure 6 and Figure 7 is a schematic structural diagram of the second light source of the fourth solution, where Figure 6 is the front view, Figure 7 is the side view. As Figure 6 shown, the second light source 601 includes M lasers 601a and M collimating elements 601b corresponding to the M lasers 601a one by one, where M≥1. All the lasers 601a emit linearly polarized light and the polarization directions of the linearly polarized light emitted by all the lasers 601a are the same, and the light-emitting directions of all the lasers 601a are also the same. Taking the light-emitting direction of the laser 601a as the axis, the second light source 601 is axially rotated by a certain angle α. Using Figure 6 and Figure 7 the structure shown can make the light emitted by the second light source 601 contain S-polarized light components and P-polarized light components when it is incident on the second optical path adjusting device or the third optical path adjusting device of any lighting device in all the following embodiments.

[0156] Figure 8 FIG. 1 is a schematic diagram of the structure of the second light source of the fifth solution. Figure 8 As shown, the second light source 801 includes J lasers 801a emitting P polarized light and J collimating elements 801b corresponding to the J lasers 801a, K lasers 801c emitting S polarized light and K collimating elements 801d corresponding to the K lasers 801c, and a polarization selection element 801e, where J≥1 and K≥1. The P polarized light emitted by the J lasers 801a is incident on one side of the polarization selection element 801e, and the S polarized light emitted by the K lasers 801c is incident on the other side of the polarization selection element 801e. The characteristic of the polarization selection element 801e is to reflect the S polarized light and allow the P polarized light to pass through. Finally, the P polarized light emitted by the J lasers 801a and the S polarized light emitted by the K lasers 801c are combined into one light beam by the polarization selection element 801e. Figure 8 The structure shown can ensure that the light emitted by the second light source 801 contains S polarized light components and P polarized light components when it enters the second light path adjustment device or the third light path adjustment device of any lighting device in all the following embodiments.

[0157] Fig. 9 FIG. 1 is a schematic diagram of the structure of the second light source of the sixth solution. Fig. 9 As shown, the second light source 901 includes J lasers 901a emitting P-polarized light and J collimating elements 901b corresponding to the J lasers 901a, K lasers 901c emitting S-polarized light and K collimating elements 901d corresponding to the K lasers 901c, a polarization selection element 901e, and a reflector 901f, where J≥1 and K≥1. The P-polarized light emitted by the J lasers 901a is reflected by the reflector 901f and then incident on one side of the polarization selection element 901e, and the S-polarized light emitted by the K lasers 901c is incident on the other side of the polarization selection element 901e. The characteristic of the polarization selection element 901e is to reflect the S-polarized light and allow the P-polarized light to pass through. Finally, the P-polarized light emitted by the J lasers 901a and the S-polarized light emitted by the K lasers 901c are combined into one light beam by the polarization selection element 901e. Fig. 9 The structure shown can ensure that the light emitted by the second light source 901 contains S polarized light components and P polarized light components when it enters the second light path adjustment device or the third light path adjustment device of any lighting device in all the following embodiments.

[0158] The structure of the static wavelength conversion device used in the following embodiments can be as follows: Fig.10 The dynamic wavelength conversion device used in the following embodiments may be as follows: Fig.11 The dynamic wavelength conversion device shown can also be Fig.12The dynamic wavelength conversion device is shown.

[0159] like Fig.10 A static wavelength conversion device 1001 is shown, comprising a reflective layer 1001a and a wavelength conversion layer 1001b disposed on the reflective layer 1001a, wherein the wavelength conversion layer 1001b is composed 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 1001a is a reflective substrate.

[0160] like Fig.11 The dynamic wavelength conversion device shown is a rotatable fluorescent wheel 1101, which includes a reflective layer and a wavelength conversion layer Y disposed on the reflective layer. The wavelength conversion layer Y is composed of yellow fluorescent material (such as yellow fluorescent powder or yellow fluorescent ceramic), which converts incident blue light into yellow light.

[0161] like Fig.12 Another dynamic wavelength conversion device shown is a rotatable fluorescent wheel 1201, which includes a reflective layer and two different wavelength conversion layers arranged on the reflective layer in different sectors of the fluorescent wheel 1201, which are wavelength conversion layer G and wavelength conversion layer R. The wavelength conversion layer G is composed of a green fluorescent material (such as 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 (such as red fluorescent powder or red fluorescent ceramic), which converts incident blue light into red light.

[0162] Example 1

[0163] like Fig.13 As shown, a lighting device disclosed in this embodiment includes a first light source 1301, a second light source 1302, a first optical path adjustment device, a first collection optical system, a wavelength conversion device 1305, a second optical path adjustment device, a quarter wave plate 1307, a second collection optical system, a first scattering optical system and a focusing optical system. The first optical path adjustment device is a flat-plate polarization beam splitter 1303. The first collection optical system is composed of a lens group 1304 including a lens 1304a and a lens 1304b. The wavelength conversion device 1305 includes a reflection layer 1305a and a wavelength conversion layer 1305b disposed on the reflection layer 1305a. The second optical path adjustment device is a flat-plate polarization beam splitter 1306. The second collection optical system is composed of a lens group 1308 including a lens 1308a and a lens 1308b. The first scattering optical system is composed of a reflective scattering plate 1309. The collection optical system is composed of a focusing lens 1310.

[0164] The flat plate polarization beam splitter 1303 in this embodiment has the characteristic of reflecting S-polarized blue light and transmitting P-polarized blue light, and at the same time, the flat plate polarization beam splitter 1303 also reflects yellow light. The flat plate polarization beam splitter 1306 in this embodiment has the characteristic of reflecting S-polarized blue light and transmitting P-polarized blue light, and at the same time, the flat plate polarization beam splitter 1306 also transmits yellow light.

[0165] The first light source 1301 emits P-polarized blue light and the blue light is incident on the flat-plate polarization beam splitter 1303. The flat-plate polarization beam splitter 1303 transmits the blue light and then directs it to the lens group 1304. The lens group 1304 converges the blue light toward the wavelength conversion device 1305. The wavelength conversion device 1305 converts the incident blue light into a first converted light (yellow light) and directs it to the lens group 1304. The first converted light (yellow light) is collected by the lens group 1304 and then directed to the flat-plate polarization beam splitter 1303. The flat-plate polarization beam splitter 1303 reflects the first converted light (yellow light) and then directs it to the flat-plate polarization beam splitter 1306. The flat-plate polarization beam splitter 1306 transmits the blue light.

[0166] The second light source 1302 emits blue light containing an S-polarized light component and a P-polarized light component, and the blue light is incident on the flat-plate polarization beam splitter 1306. The flat-plate polarization beam splitter 1306 separates the blue light into S-polarized blue light and P-polarized blue light, and reflects the S-polarized blue light and transmits the P-polarized blue light. The S-polarized blue light reflected by the flat-plate polarization beam splitter 1306 is emitted toward the flat-plate polarization beam splitter 1303, and the P-polarized blue light transmitted through the flat-plate polarization beam splitter 1306 is emitted toward the quarter-wave plate 1307.

[0167] The flat plate polarization beam splitter 1303 reflects the S-polarized blue light from the flat plate polarization beam splitter 1306 and directs it toward the lens group 1304, which converges it toward the wavelength conversion device 1305. The wavelength conversion device 1305 converts the incident blue light into a second converted light (yellow light) and directs it toward the lens group 1304. The second converted light (yellow light) is collected by the lens group 1304 and directed toward the flat plate polarization beam splitter 1303. The flat plate polarization beam splitter 1303 reflects the second converted light (yellow light) and directs it toward the flat plate polarization beam splitter 1306, which transmits it.

[0168] The P-polarized blue light transmitted through the flat-plate polarization beam splitter 1306 is converted into circularly polarized blue light after being transmitted through the quarter-wave plate 1307. The lens group 1308 converges the circularly polarized blue light toward the reflective scattering plate 1309. The circularly polarized blue light is reflected by the reflective scattering plate 1309 and then directed toward the lens group 1308, and then collected by the lens group 1308 and directed toward the quarter-wave plate 1307. The circularly polarized blue light is transmitted through the quarter-wave plate 1307 and converted into S-polarized blue light, which is directed toward the flat-plate polarization beam splitter 1306, and the flat-plate polarization beam splitter 1306 reflects it.

[0169] The first converted light (yellow light) and the second converted light (yellow light) transmitted through the flat polarization beam splitter 1306 and the S-polarized blue light reflected by the flat polarization beam splitter 1306 are combined into a mixed light and emitted to the focusing lens 1310. The mixed light of the yellow light and the blue light is white light. Finally, the focusing lens 1310 converges the white light and emits it from the lighting device.

[0170] Example 2

[0171] like Fig.14 As shown, a lighting device disclosed in this embodiment includes a first light source 1401, a second light source 1402, a first light path adjustment device (composed of a flat-plate polarization beam splitter 1403), a first collecting optical system (composed of a lens group 1404 including a lens 1404a and a lens 1404b), a wavelength conversion device 1405 (comprising a reflective layer 1405a and a wavelength conversion layer 1405b disposed on the reflective layer 1405a), a second light path adjustment device (composed of a flat-plate polarization beam splitter 1406), a quarter wave plate 1407, a second collecting optical system (composed of a lens group 1408 including a lens 1408a and a lens 1408b), a first scattering optical system (composed of a reflective scattering plate 1409), a focusing optical system (composed of a focusing lens 1410), a first lens group 1411, and a second lens group 1412.

[0172] The first difference between this embodiment and embodiment 1 is that a first lens group 1411 is provided on the optical path from the first light source 1401 to the flat polarization beam splitter 1403. The first lens group 1411 is composed of a positive lens 1411a and a negative lens 1411b, and is used to reduce the light beam formed by the blue light emitted by the first light source 1401.

[0173] The second difference between this embodiment and embodiment 1 is that a second lens group 1412 is provided on the optical path from the second light source 1402 to the flat polarization beam splitter 1406. The second lens group 1412 is composed of a positive lens 1412a and a negative lens 1412b, and is used to reduce the light beam formed by the blue light emitted by the second light source 1402.

[0174] Example 3

[0175] like Fig.15 As shown, a lighting device disclosed in this embodiment includes a first light source 1501, a second light source 1502, a first light path adjustment device, a first collecting optical system (composed of a lens group 1504 including a lens 1504a and a lens 1504b), a wavelength conversion device 1505 (comprising a reflection layer 1505a and a wavelength conversion layer 1505b disposed on the reflection layer 1505a), a second light path adjustment device, a quarter wave plate 1507, a second collecting optical system (composed of a lens group 1508 including a lens 1508a and a lens 1508b), a first scattering optical system (composed of a reflective scattering plate 1509), a focusing optical system (composed of a focusing lens 1510), a first uniform light optical system, and a second uniform light optical system.

[0176] The first difference between this embodiment and Embodiment 1 is that the first optical path adjustment device in this embodiment is composed of a cubic polarization beam splitter 1503 instead of a flat polarization beam splitter.

[0177] The second difference between this embodiment and Embodiment 1 is that the second optical path adjustment device in this embodiment is composed of a cube-type polarization beam splitter 1506 instead of a flat-plate polarization beam splitter.

[0178] The third difference between this embodiment and the first embodiment is that a first light homogenizing optical system is provided on the optical path from the first light source 1501 to the cubic polarization beam splitter 1503. The first light homogenizing optical system is composed of a transmissive diffuser 1513, and is used to homogenize the blue light emitted by the first light source 1501.

[0179] The fourth difference between this embodiment and the first embodiment is that a second light homogenizing optical system is provided on the optical path from the second light source 1502 to the cubic polarization beam splitter 1506. The second light homogenizing optical system is composed of a transmissive diffuser 1514, which is used to homogenize the blue light emitted by the second light source 1502.

[0180] Example 4

[0181] like Fig.16As shown, an illumination device disclosed in this embodiment includes a first light source 1601, a second light source 1602, a first optical path adjustment device (composed of a flat-plate polarization beam splitter 1603), a first collecting optical system (composed of a lens group 1604 including a lens 1604a and a lens 1604b), a wavelength conversion device, a second optical path adjustment device (composed of a flat-plate polarization beam splitter 1606), a quarter-wave plate 1607, a second collecting optical system (composed of a lens group 1608 including a lens 1608a and a lens 1608b), a first scattering optical system, and a focusing optical system (composed of a focusing lens 1610).

[0182] The first difference between this embodiment and Embodiment 1 is that the wavelength conversion device in this embodiment is a rotatable fluorescent wheel 1605 .

[0183] 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 1609 .

[0184] Example 5

[0185] like Fig.17 As shown, a lighting device disclosed in this embodiment includes a first light source 1701, a second light source 1702, a first light path adjustment device (composed of a flat-plate polarization beam splitter 1703), a first collecting optical system (composed of a lens group 1704 including a lens 1704a and a lens 1704b), a wavelength conversion device (including a reflection layer 1705a and a wavelength conversion layer 1705b arranged on the reflection layer 1705a), a second light path adjustment device (composed of a flat-plate polarization beam splitter 1706), a quarter wave plate 1707, a second collecting optical system (composed of a lens group 1708 including a lens 1708a and a lens 1708b), a first scattering optical system 1709 and a focusing optical system (composed of a focusing lens 1710).

[0186] The difference between this embodiment and Embodiment 1 is that the first scattering optical system 1709 in this embodiment is composed of a transmission scattering plate 1709a and a reflecting mirror 1709b.

[0187] Example 6

[0188] like Fig.18As shown, a lighting device disclosed in this embodiment includes a first light source 1801, a second light source 1802, a first light path adjustment device (composed of a flat-plate polarization beam splitter 1803), a first collecting optical system (composed of a lens group 1804 including a lens 1804a and a lens 1804b), a wavelength conversion device (including a reflection layer 1805a and a wavelength conversion layer 1805b arranged on the reflection layer 1805a), a second light path adjustment device (composed of a flat-plate polarization beam splitter 1806), a quarter wave plate 1807, a second collecting optical system (composed of a lens group 1808 including a lens 1808a and a lens 1808b), a first scattering optical system 1809 (composed of a focusing lens 1810), a focusing optical system (composed of a focusing lens 1810), a light guiding optical system 1815 and a reflecting element 1816.

[0189] The difference between this embodiment and the first embodiment is that a light-guiding optical system 1815 and a reflecting element 1816 are provided on the optical path from the second light source 1802 to the flat-plate polarization beam splitter 1806. The light-guiding optical system 1815 is composed of a positive lens 1815a and a positive lens 1815b, the transmission area of ​​the reflecting element 1816 is a light-through hole 1816a, and the positive lens 1815b is located at the light-through hole 1816a. The second light source 1802 emits blue light containing an S-polarized light component and a P-polarized light component, and the blue light is guided by the light-guiding optical system 1815 to the flat-plate polarization beam splitter 1806, and the flat-plate polarization beam splitter 1806 separates the blue light into S-polarized blue light and P-polarized blue light, and reflects the S-polarized blue light and transmits the P-polarized blue light. Wherein: the subsequent optical path of the S-polarized blue light reflected by the flat-plate polarization beam splitter 1806 is the same as the optical path of the S-polarized blue light reflected by the flat-plate polarization beam splitter 1306 in Example 1; the P-polarized blue light transmitted through the flat-plate polarization beam splitter 1806 is directed to the quarter-wave plate 1807. The P-polarized blue light is converted into circularly polarized blue light after being transmitted through the quarter-wave plate 1807. The lens group 1808 converges the circularly polarized blue light toward the reflective scattering plate 1809. The reflective scattering plate 1809 reflects the incident circularly polarized blue light. Part of the blue light reflected by the reflective scattering plate 1809 is converted into non-polarized blue light, and the rest is still circularly polarized blue light. The blue light is collected by the lens group 1808 and directed to the quarter-wave plate 1807, then transmitted through the quarter-wave plate 1807 and incident on the flat-plate polarization beam splitter 1806. The circularly polarized blue light is converted into S-polarized blue light after passing through the quarter-wave plate 1807, and the S-polarized blue light is reflected by the flat-plate polarization beam splitter 1806. The non-polarized blue light is separated into S-polarized blue light and P-polarized blue light by the flat-plate polarization beam splitter 1806, wherein the S-polarized blue light is reflected by the flat-plate polarization beam splitter 1806, and the P-polarized blue light is passed through the flat-plate polarization beam splitter 1806 and emitted to the reflective element 1816. The reflective element 1816 reflects most of the P-polarized blue light from the flat-plate polarization beam splitter 1806 and emits it back to the flat-plate polarization beam splitter 1806, and then the P-polarized blue light is passed through the flat-plate polarization beam splitter 1806 and emitted to the quarter-wave plate 1807 again.

[0190] Example 7

[0191] like Fig.19As shown, a lighting device disclosed in this embodiment includes a first light source 1901, a second light source 1902, a first light path adjustment device (composed of a flat polarization beam splitter 1903), a first collection optical system (composed of a lens group 1904 including a lens 1904a and a lens 1904b), a wavelength conversion device 1905 (comprising a reflection layer 1905a and a wavelength conversion layer 1905b disposed on the reflection layer 1905a), a second light path adjustment device (composed of a flat polarization beam splitter 1906), a quarter wave plate 1907, a second collection optical system (composed of a lens group 1908 including a lens 1908a and a lens 1908b), a first scattering optical system (composed of a reflective scattering plate 1909), a condensing optical system (composed of a focusing lens 1910), a quarter wave plate 1917, a third collection optical system, and a second scattering optical system. The third collection optical system is composed of a lens group 1918 including a lens 1918a and a lens 1918b. The second scattering optical system is composed of a reflective scattering plate 1919.

[0192] The difference between this embodiment and the first embodiment is that the first light source 1901 emits blue light containing S polarized light components and P polarized light components and the blue light is incident on the flat polarization beam splitter 1903, and the flat polarization beam splitter 1903 separates the blue light into S polarized blue light and P polarized blue light, and reflects the S polarized blue light and transmits the P polarized blue light. The optical path of the P polarized blue light transmitted through the flat polarization beam splitter 1903 is the same as the optical path of the P polarized blue light transmitted through the flat polarization beam splitter 1303 in the first embodiment; the S polarized blue light reflected by the flat polarization beam splitter 1903 is emitted to the quarter wave plate 1917. The S polarized blue light is converted into circularly polarized blue light after being transmitted through the quarter wave plate 1917. The lens group 1918 converges the circularly polarized blue light toward the reflective scattering plate 1919. The incident circularly polarized blue light is reflected by the reflective scattering plate 1919. The circularly polarized blue light reflected by the reflective scattering plate 1919 is collected by the lens group 1918 and then directed to the quarter wave plate 1917. The circularly polarized blue light is transmitted through the quarter wave plate 1917 and converted into P-polarized blue light, which is directed to the flat-plate polarization beam splitter 1903, which transmits the blue light and then to the flat-plate polarization beam splitter 1906, which transmits the blue light.

[0193] Example 8

[0194] like Fig. 20As shown, a lighting device disclosed in this embodiment includes a first light source 2001, a second light source 2002, a first light path adjustment device (composed of a flat-plate polarization beam splitter 2003), a first collecting optical system (composed of a lens group 2004 including a lens 2004a and a lens 2004b), a wavelength conversion device 2005 (comprising a reflective layer 2005a and a wavelength conversion layer 2005b arranged on the reflective layer 2005a), a second light path adjustment device (composed of a flat-plate polarization beam splitter 2006), a quarter-wave plate 2007, a second collecting 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) and a focusing optical system (composed of a focusing lens 2010).

[0195] The characteristic of the flat-plate polarization beam splitter 2003 in this embodiment is to reflect the blue light of S polarization light and transmit the blue light of P polarization light, and at the same time, the flat-plate polarization beam splitter 2003 also transmits the yellow light. The characteristic of the flat-plate polarization beam splitter 2006 in this embodiment is to reflect the blue light of S polarization light and transmit the blue light of P polarization light, and at the same time, the flat-plate polarization beam splitter 2006 also reflects the yellow light.

[0196] The first light source 2001 emits S-polarized blue light and the blue light enters the flat-plate polarization beam splitter 2003, which reflects the blue light and then directs it to the lens group 2004. The lens group 2004 converges the blue light toward the wavelength conversion device 2005. The wavelength conversion device 2005 converts the incident blue light into a first converted light (yellow light) and directs it to the lens group 2004. The first converted light (yellow light) is collected by the lens group 2004 and then directed to the flat-plate polarization beam splitter 2003. The flat-plate polarization beam splitter 2003 transmits the first converted light (yellow light) and then directs it to the flat-plate polarization beam splitter 2006, which reflects the blue light.

[0197] The second light source 2002 emits blue light containing an S polarized light component and a P polarized light component, and the blue light is incident on the flat-plate polarization beam splitter 2006. The flat-plate polarization beam splitter 2006 separates the blue light into an S polarized blue light and a P polarized blue light, and reflects the S polarized blue light and transmits the P polarized blue light. The P polarized blue light transmitted through the flat-plate polarization beam splitter 2006 is emitted toward the flat-plate polarization beam splitter 2003, and the S polarized blue light reflected by the flat-plate polarization beam splitter 2006 is emitted toward the quarter wave plate 2007.

[0198] The flat plate polarization beam splitter 2003 transmits the blue light of the P polarized light from the flat plate polarization beam splitter 2006 and directs it toward the lens group 2004, which converges it toward the wavelength conversion device 2005. The wavelength conversion device 2005 converts the incident blue light into a second converted light (yellow light) and directs it toward the lens group 2004. The second converted light (yellow light) is collected by the lens group 2004 and directed toward the flat plate polarization beam splitter 2003. The flat plate polarization beam splitter 2003 transmits the second converted light (yellow light) and directs it toward the flat plate polarization beam splitter 2006, which reflects it.

[0199] The S-polarized blue light reflected by the flat polarization beam splitter 2006 is converted into circularly polarized blue light after passing through the quarter wave plate 2007. The lens group 2008 converges the circularly polarized blue light toward the reflective scattering plate 2009. The circularly polarized blue light is reflected by the reflective scattering plate 2009 and then directed toward the lens group 2008, and then collected by the lens group 2008 and directed toward the quarter wave plate 2007. The circularly polarized blue light is converted into P-polarized blue light after passing through the quarter wave plate 2007, and the P-polarized blue light is directed toward the flat polarization beam splitter 2006, which transmits it.

[0200] The first converted light (yellow light) and the second converted light (yellow light) reflected by the flat polarization beam splitter 2006 and the blue light of the P polarization light transmitted through the flat polarization beam splitter 2006 are combined into a mixed light and emitted to the focusing lens 2010. The mixed light of the yellow light and the blue light is white light. Finally, the focusing lens 2010 converges the white light and emits it from the lighting device.

[0201] Example 9

[0202] like Fig.21 As shown, a lighting device disclosed in this embodiment includes a first light source 2101, a second light source 2102, a first light path adjustment device (composed of a flat-plate polarization beam splitter 2103), a first collecting optical system (composed 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 arranged on the reflective layer 2105a), a second light path adjustment device (composed of a flat-plate polarization beam splitter 2106), a quarter-wave plate 2107, a second collecting 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), a focusing optical system (composed of a focusing lens 2110) and a half-wave plate 2120.

[0203] The flat-plate polarization beam splitter 2103 in this embodiment has the characteristic of reflecting S-polarized blue light and transmitting P-polarized blue light, and the flat-plate polarization beam splitter 2103 also transmits yellow light. The flat-plate polarization beam splitter 2106 in this embodiment has the characteristic of reflecting S-polarized blue light and transmitting P-polarized blue light, and the flat-plate polarization beam splitter 2106 also transmits yellow light.

[0204] The first light source 2101 emits S-polarized blue light and the blue light is incident on the flat-plate polarization beam splitter 2103. The flat-plate polarization beam splitter 2103 reflects the blue light and then directs it toward the lens group 2104. The lens group 2104 converges the blue light toward the wavelength conversion device 2105. The wavelength conversion device 2105 converts the incident blue light into a first converted light (yellow light) and directs it toward the lens group 2104. The first converted light (yellow light) is collected by the lens group 2104 and then directed toward the flat-plate polarization beam splitter 2103. The flat-plate polarization beam splitter 2103 transmits the first converted light (yellow light) and then directs it toward the half-wave plate 2120. The first converted light (yellow light) is transmitted through the half-wave plate 2120 and then continues to direct toward the flat-plate polarization beam splitter 2106. The flat-plate polarization beam splitter 2106 transmits the first converted light (yellow light).

[0205] The second light source 2102 emits blue light containing an S-polarized light component and a P-polarized light component, and the blue light is incident on the flat-plate polarization beam splitter 2106. The flat-plate polarization beam splitter 2106 separates the blue light into S-polarized blue light and P-polarized blue light, and reflects the S-polarized blue light and transmits the P-polarized blue light. The S-polarized blue light reflected by the flat-plate polarization beam splitter 2106 is emitted to the half-wave plate 2120, and the P-polarized blue light transmitted through the flat-plate polarization beam splitter 2106 is emitted to the quarter-wave plate 2107.

[0206] The S-polarized blue light reflected by the flat-plate polarization beam splitter 2106 is transmitted through the half-wave plate 2120 and converted into P-polarized blue light. The P-polarized blue light continues to be emitted toward the flat-plate polarization beam splitter 2103. The flat-plate polarization beam splitter 2103 transmits the blue light and then emits it toward the lens group 2104. The lens group 2104 converges the blue light toward the wavelength conversion device 2105. The wavelength conversion device 2105 converts the incident blue light into a second converted light (yellow light) and emits it toward the lens group 2104. The second converted light (yellow light) is collected by the lens group 2104 and then emitted toward the flat-plate polarization beam splitter 2103. The flat-plate polarization beam splitter 2103 transmits the second converted light (yellow light) and then emits it toward the half-wave plate 2120. The second converted light (yellow light) continues to be emitted toward the flat-plate polarization beam splitter 2106 after transmitting through the half-wave plate 2120. The flat-plate polarization beam splitter 2106 transmits the blue light.

[0207] The P-polarized blue light transmitted through the flat-plate polarization beam splitter 2106 is converted into circularly polarized blue light after being transmitted through the quarter-wave plate 2107. The lens group 2108 converges the circularly polarized blue light toward the reflective scattering plate 2109. The circularly polarized blue light is reflected by the reflective scattering plate 2109 and then directed toward the lens group 2108, and then collected by the lens group 2108 and directed toward the quarter-wave plate 2107. The circularly polarized blue light is transmitted through the quarter-wave plate 2107 and converted into S-polarized blue light, which is directed toward the flat-plate polarization beam splitter 2106, and the flat-plate polarization beam splitter 2106 reflects it.

[0208] The first converted light (yellow light) and the second converted light (yellow light) transmitted through the flat polarization beam splitter 2106 and the S-polarized blue light reflected by the flat polarization beam splitter 2106 are combined into a mixed light and emitted to the focusing lens 2110. The mixed light of the yellow light and the blue light is white light. Finally, the focusing lens 2110 converges the white light and emits it from the lighting device.

[0209] Example 10

[0210] like Fig. 22 As shown, a lighting device disclosed in this embodiment includes a first light source 2201, a second light source 2202, a first light path adjustment device (composed of a flat-plate polarization beam splitter 2203), a first collecting optical system (composed 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 arranged on the reflective layer 2205a), a second light path adjustment device (composed of a flat-plate polarization beam splitter 2206), a quarter-wave plate 2207, a second collecting 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), a focusing optical system (composed of a focusing lens 2210) and a half-wave plate 2220.

[0211] The flat-plate polarization beam splitter 2203 in this embodiment has the characteristic of reflecting S-polarized blue light and transmitting P-polarized blue light, and at the same time, the flat-plate polarization beam splitter 2203 also reflects yellow light. The flat-plate polarization beam splitter 2206 in this embodiment has the characteristic of reflecting S-polarized blue light and transmitting P-polarized blue light, and at the same time, the flat-plate polarization beam splitter 2206 also reflects yellow light.

[0212] The first light source 2201 emits a blue light of P polarized light and the blue light is incident on the flat-plate polarization beam splitter 2203. The flat-plate polarization beam splitter 2203 transmits the blue light and then directs it to the lens group 2204. The lens group 2204 converges the blue light toward the wavelength conversion device 2205. The wavelength conversion device 2205 converts the incident blue light into a first converted light (yellow light) and directs it to the lens group 2204. The first converted light (yellow light) is collected by the lens group 2204 and then directed to the flat-plate polarization beam splitter 2203. The flat-plate polarization beam splitter 2203 reflects the first converted light (yellow light) and then directs it to the half-wave plate 2220. The first converted light (yellow light) is transmitted through the half-wave plate 2220 and then continues to direct to the flat-plate polarization beam splitter 2206, and the flat-plate polarization beam splitter 2206 reflects it.

[0213] The second light source 2202 emits blue light containing an S-polarized light component and a P-polarized light component, and the blue light is incident on the flat-plate polarization beam splitter 2206. The flat-plate polarization beam splitter 2206 separates the blue light into S-polarized blue light and P-polarized blue light, and reflects the S-polarized blue light and transmits the P-polarized blue light. The P-polarized blue light transmitted through the flat-plate polarization beam splitter 2206 is emitted toward the half-wave plate 2220, and the S-polarized blue light reflected by the flat-plate polarization beam splitter 2206 is emitted toward the quarter-wave plate 2207.

[0214] The P-polarized blue light transmitted through the flat-plate polarization beam splitter 2206 is converted into S-polarized blue light after being transmitted through the half-wave plate 2220. The S-polarized blue light continues to be emitted toward the flat-plate polarization beam splitter 2203, which reflects the blue light and then emits it toward the lens group 2204. The lens group 2204 converges the blue light toward the wavelength conversion device 2205. The wavelength conversion device 2205 converts the incident blue light into a second converted light (yellow light) and emits it toward the lens group 2204. The second converted light (yellow light) is collected by the lens group 2204 and then emitted toward the flat-plate polarization beam splitter 2203. The flat-plate polarization beam splitter 2203 reflects the second converted light (yellow light) and then emits it toward the half-wave plate 2220. The second converted light (yellow light) continues to be emitted toward the flat-plate polarization beam splitter 2206 after being transmitted through the half-wave plate 2220, and the flat-plate polarization beam splitter 2206 reflects the blue light.

[0215] The S-polarized blue light reflected by the flat-plate polarization beam splitter 2206 is converted into circularly polarized blue light after being transmitted through the quarter-wave plate 2207. The lens group 2208 converges the circularly polarized blue light toward the reflective scattering plate 2209. The circularly polarized blue light is reflected by the reflective scattering plate 2209 and then directed toward the lens group 2208. Then, the circularly polarized blue light is collected by the lens group 2208 and then directed toward the quarter-wave plate 2207. The circularly polarized blue light is transmitted through the quarter-wave plate 2207 and converted into P-polarized blue light. The P-polarized blue light is directed toward the flat-plate polarization beam splitter 2206, and the flat-plate polarization beam splitter 2206 transmits it.

[0216] The first converted light (yellow light) and the second converted light (yellow light) reflected by the flat polarization beam splitter 2206 and the blue light of the P polarization light transmitted through the flat polarization beam splitter 2206 are combined into a mixed light and emitted to the focusing lens 2210. The mixed light of the yellow light and the blue light is white light. Finally, the focusing lens 2210 converges the white light and emits it from the lighting device.

[0217] Embodiment 11

[0218] like Fig.23 As shown, a lighting device disclosed in this embodiment includes a first light source 2301, a second light source 2302, a first optical path adjustment device, a first collection optical system, a wavelength conversion device 2305, a third optical path adjustment device, a quarter wave plate 2307, a second collection optical system, a first scattering optical system and a focusing optical system. The first optical path adjustment device is a flat-plate polarization beam splitter 2303. The first collection optical system is composed of a lens group 2304 including a lens 2304a and a lens 2304b. The wavelength conversion device 2305 includes a reflection layer 2305a and a wavelength conversion layer 2305b disposed on the reflection layer 2305a. The third optical path adjustment device is a flat-plate polarization beam splitter 2306. The second collection optical system is composed of a lens group 2308 including a lens 2308a and a lens 2308b. The first scattering optical system is composed of a reflective scattering plate 2309. The collection optical system is composed of a focusing lens 2310.

[0219] The flat-plate polarization beam splitter 2303 in this embodiment has the characteristic of reflecting S-polarized blue light and transmitting P-polarized blue light, and at the same time, the flat-plate polarization beam splitter 2303 also transmits yellow light. The flat-plate polarization beam splitter 2306 in this embodiment has the characteristic of reflecting S-polarized blue light and transmitting P-polarized blue light, and at the same time, the flat-plate polarization beam splitter 2306 also reflects yellow light.

[0220] The first light source 2301 emits S-polarized blue light and the blue light is incident on the flat-plate polarization beam splitter 2303. The flat-plate polarization beam splitter 2303 reflects the blue light and then directs it to the flat-plate polarization beam splitter 2306. The flat-plate polarization beam splitter 2306 reflects the blue light and then directs it to the lens group 2304. The lens group 2304 converges the blue light toward the wavelength conversion device 2305. The wavelength conversion device 2305 converts the incident blue light into a first converted light (yellow light) and directs it to the lens group 2304. The first converted light (yellow light) is collected by the lens group 2304 and then directed to the flat-plate polarization beam splitter 2306. The flat-plate polarization beam splitter 2306 reflects the first converted light (yellow light) and then directs it to the flat-plate polarization beam splitter 2303. The flat-plate polarization beam splitter 2303 transmits the first converted light (yellow light).

[0221] The second light source 2302 emits blue light containing an S-polarized light component and a P-polarized light component, and the blue light is incident on the flat-plate polarization beam splitter 2306. The flat-plate polarization beam splitter 2306 separates the blue light into S-polarized blue light and P-polarized blue light, and reflects the S-polarized blue light and transmits the P-polarized blue light. The P-polarized blue light transmitted through the flat-plate polarization beam splitter 2306 is emitted toward the lens group 2304, and the S-polarized blue light reflected by the flat-plate polarization beam splitter 2306 is emitted toward the quarter-wave plate 2307.

[0222] The lens group 2304 converges the blue light of the P polarized light transmitted through the flat-plate polarization beam splitter 2306 toward the wavelength conversion device 2305. The wavelength conversion device 2305 converts the incident blue light into the second converted light (yellow light) and directs it toward the lens group 2304. The second converted light (yellow light) is collected by the lens group 2304 and then directed toward the flat-plate polarization beam splitter 2306. The flat-plate polarization beam splitter 2306 reflects the second converted light (yellow light) and then directs it toward the flat-plate polarization beam splitter 2303, and the flat-plate polarization beam splitter 2303 transmits it.

[0223] The S-polarized blue light reflected by the flat-plate polarization beam splitter 2306 is converted into circularly polarized blue light after being transmitted through the quarter-wave plate 2307. The lens group 2308 converges the circularly polarized blue light toward the reflective scattering plate 2309. The circularly polarized blue light is reflected by the reflective scattering plate 2309 and then directed toward the lens group 2308, and then collected by the lens group 2308 and directed toward the quarter-wave plate 2307. The circularly polarized blue light is transmitted through the quarter-wave plate 2307 and converted into P-polarized blue light, and the P-polarized blue light is directed toward the flat-plate polarization beam splitter 2306. The flat-plate polarization beam splitter 2306 transmits the P-polarized blue light and then directs it toward the flat-plate polarization beam splitter 2303, and the flat-plate polarization beam splitter 2303 transmits it.

[0224] The first converted light (yellow light), the second converted light (yellow light) and the P-polarized blue light transmitted through the flat polarization beam splitter 2303 are combined into a mixed light and emitted to the focusing lens 2310. The mixed light of the yellow light and the blue light is white light. Finally, the focusing lens 2310 converges the white light and emits it from the lighting device.

[0225] Example 12

[0226] like Fig.24 As shown, a lighting device disclosed in this embodiment includes a first light source 2401, a second light source 2402, a first light path adjustment device (composed of a flat-plate polarization beam splitter 2403), a first collecting optical system (composed of a lens group 2404 including a lens 2404a and a lens 2404b), a wavelength conversion device 2405 (including a reflection layer 2405a and a wavelength conversion layer 2405b arranged on the reflection layer 2405a), a third light path adjustment device (composed of a flat-plate polarization beam splitter 2406), a quarter wave plate 2407, a second collecting optical system (composed of a lens group 2408 including a lens 2408a and a lens 2408b), a first scattering optical system (composed of a reflective scattering plate 2409), a focusing optical system (composed of a focusing lens 2410), a first lens group 2411 and a second lens group 2412.

[0227] The first difference between this embodiment and embodiment 11 is that a first lens group 2411 is provided on the optical path from the first light source 2401 to the flat polarization beam splitter 2403. The first lens group 2411 is composed of a positive lens 2411a and a negative lens 2411b, and is used to reduce the light beam formed by the blue light emitted by the first light source 2401.

[0228] The second difference between this embodiment and embodiment 11 is that a second lens group 2412 is provided on the optical path from the second light source 2402 to the flat polarization beam splitter 2406. The second lens group 2412 is composed of a positive lens 2412a and a negative lens 2412b, and is used to reduce the light beam formed by the blue light emitted by the second light source 2402.

[0229] Example 13

[0230] like Fig.25As shown, a lighting device disclosed in this embodiment includes a first light source 2501, a second light source 2502, a first light path adjustment device, a first collecting optical system (composed of a lens group 2504 including a lens 2504a and a lens 2504b), a wavelength conversion device 2505 (including a reflection layer 2505a and a wavelength conversion layer 2505b arranged on the reflection layer 2505a), a third light path adjustment device, a quarter wave plate 2507, a second collecting optical system (composed of a lens group 2508 including a lens 2508a and a lens 2508b), a first scattering optical system (composed of a reflective scattering plate 2509), a focusing optical system (composed of a focusing lens 2510), a first uniform light optical system and a second uniform light optical system.

[0231] The first difference between this embodiment and Embodiment 11 is that the first optical path adjustment device in this embodiment is composed of a cube-type polarization beam splitter 2503 instead of a flat-plate polarization beam splitter.

[0232] The second difference between this embodiment and Embodiment 11 is that the third optical path adjustment device in this embodiment is composed of a cubic polarization beam splitter 2506 instead of a flat polarization beam splitter.

[0233] The third difference between this embodiment and embodiment 11 is that a first light homogenizing optical system is provided on the optical path from the first light source 2501 to the cubic polarization beam splitter 2503. The first light homogenizing optical system is composed of a transmissive diffuser 2513, and is used to homogenize the blue light emitted by the first light source 2501.

[0234] The fourth difference between this embodiment and embodiment 11 is that a second light homogenizing optical system is provided on the optical path from the second light source 2502 to the cubic polarization beam splitter 2506. The second light homogenizing optical system is composed of a transmissive diffuser 2514, which is used to homogenize the blue light emitted by the second light source 2502.

[0235] Embodiment 14

[0236] like Fig.26 As shown, an illumination device disclosed in this embodiment includes a first light source 2601, a second light source 2602, a first optical path adjustment device (composed of a flat-plate polarization beam splitter 2603), a first collecting optical system (composed of a lens group 2604 including a lens 2604a and a lens 2604b), a wavelength conversion device, a third optical path adjustment device (composed of a flat-plate polarization beam splitter 2606), a quarter-wave plate 2607, a second collecting optical system (composed of a lens group 2608 including a lens 2608a and a lens 2608b), a first scattering optical system, and a focusing optical system (composed of a focusing lens 2610).

[0237] The first difference between this embodiment and Embodiment 11 is that the wavelength conversion device in this embodiment is a rotatable fluorescent wheel 2605 .

[0238] The second difference between this embodiment and Embodiment 11 is that the first scattering optical system in this embodiment is a rotatable reflective scattering plate 2609 .

[0239] Embodiment 15

[0240] like Fig. 27 As shown, a lighting device disclosed in this embodiment includes a first light source 2701, a second light source 2702, a first light path adjustment device (composed of a flat-plate polarization beam splitter 2703), a first collecting optical system (composed of a lens group 2704 including a lens 2704a and a lens 2704b), a wavelength conversion device (including a reflection layer 2705a and a wavelength conversion layer 2705b arranged on the reflection layer 2705a), a third light path adjustment device (composed of a flat-plate polarization beam splitter 2706), a quarter wave plate 2707, a second collecting optical system (composed of a lens group 2708 including a lens 2708a and a lens 2708b), a first scattering optical system 2709 and a focusing optical system (composed of a focusing lens 2710).

[0241] The difference between this embodiment and embodiment 11 is that the first scattering optical system 2709 in this embodiment is composed of a transmission scattering plate 2709a and a reflecting mirror 2709b.

[0242] Example 16

[0243] like Fig.28 As shown, a lighting device disclosed in this embodiment includes a first light source 2801, a second light source 2802, a first light path adjustment device (composed of a flat-plate polarization beam splitter 2803), a first collecting optical system (composed of a lens group 2804 including a lens 2804a and a lens 2804b), a wavelength conversion device (including a reflection layer 2805a and a wavelength conversion layer 2805b arranged on the reflection layer 2805a), a third light path adjustment device (composed of a flat-plate polarization beam splitter 2806), a quarter wave plate 2807, a second collecting optical system (composed of a lens group 2808 including a lens 2808a and a lens 2808b), a first scattering optical system 2809 (composed of a focusing lens 2810), a focusing optical system (composed of a focusing lens 2810), a light guiding optical system 2815 and a reflecting element 2816.

[0244] The difference between this embodiment and the embodiment 11 is that a light guide optical system 2815 and a reflective element 2816 are provided on the optical path from the second light source 2802 to the flat-plate polarization beam splitter 2806. The light guide 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 through hole 2816a and the positive lens 2815b is located at the light through hole 2816a. The second light source 2802 emits blue light containing an S-polarized light component and a P-polarized light component and the blue light is guided by the light guide optical system 2815 to the flat-plate polarization beam splitter 2806, and the flat-plate polarization beam splitter 2806 separates the blue light into S-polarized blue light and P-polarized blue light, and reflects the S-polarized blue light and transmits the P-polarized blue light. Wherein: the optical path of the P-polarized blue light transmitted through the flat-plate polarization beam splitter 2806 is the same as the optical path of the P-polarized blue light transmitted through the flat-plate polarization beam splitter 2306 in Example 11; the S-polarized blue light reflected by the flat-plate polarization beam splitter 2806 is directed to the quarter-wave plate 2807. The S-polarized blue light is converted into circularly polarized blue light after being transmitted through the quarter-wave plate 2807. The lens group 2808 converges the circularly polarized blue light toward the reflective scattering plate 2809. The reflective scattering plate 2809 reflects the incident circularly polarized blue light. Part of the blue light reflected by the reflective scattering plate 2809 is converted into non-polarized blue light, and the rest is still circularly polarized blue light. The blue light is collected by the lens group 2808 and directed to the quarter-wave plate 2807, then transmitted through the quarter-wave plate 2807 and incident on the flat-plate polarization beam splitter 2806. The circularly polarized blue light is converted into P-polarized blue light after passing through the quarter-wave plate 2807, and the P-polarized blue light is transmitted through the flat-plate polarization beam splitter 2806. The non-polarized blue light is separated into S-polarized blue light and P-polarized blue light by the flat-plate polarization beam splitter 2806, and the P-polarized blue light is transmitted through the flat-plate polarization beam splitter 2806, and the S-polarized blue light is reflected by the flat-plate polarization beam splitter 2806 and then emitted to the reflective element 2816. The reflective element 2816 reflects most of the S-polarized blue light from the flat-plate polarization beam splitter 2806 and emits it back to the flat-plate polarization beam splitter 2806, and then the S-polarized blue light is reflected by the flat-plate polarization beam splitter 2806 and then emitted to the quarter-wave plate 2807 again.

[0245] Embodiment 17

[0246] like Fig.29As shown, a lighting device disclosed in this embodiment includes a first light source 2901, a second light source 2902, a first light path adjustment device (composed of a flat polarization beam splitter 2903), a first collection optical system (composed of a lens group 2904 including a lens 2904a and a lens 2904b), a wavelength conversion device 2905 (comprising a reflection layer 2905a and a wavelength conversion layer 2905b disposed on the reflection layer 2905a), a third light path adjustment device (composed of a flat polarization beam splitter 2906), a quarter wave plate 2907, a second collection optical system (composed of a lens group 2908 including a lens 2908a and a lens 2908b), a first scattering optical system (composed of a reflective scattering plate 2909), a 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 is composed of a lens group 2918 including a lens 2918a and a lens 2918b. The second scattering optical system is composed of a reflective scattering plate 2919.

[0247] The difference between this embodiment and the embodiment 11 is that: the first light source 2901 emits blue light containing S polarized light components and P polarized light components and the blue light is incident on the flat plate polarization beam splitter 2903, and the flat plate polarization beam splitter 2903 separates the blue light into S polarized blue light and P polarized blue light, and reflects the S polarized blue light and transmits the P polarized blue light. Among them: the subsequent optical path of the S polarized blue light reflected by the flat plate polarization beam splitter 2903 is the same as the optical path of the S polarized blue light reflected by the flat plate polarization beam splitter 2303 in the embodiment 11; the P polarized blue light transmitted through the flat plate polarization beam splitter 2903 is emitted to the quarter wave plate 2917. The P polarized blue light is converted into circularly polarized blue light after transmitting through the quarter wave plate 2917. The lens group 2918 converges the circularly polarized blue light toward the reflective scattering plate 2919. The incident circularly polarized blue light is reflected by the reflective scattering plate 2919. The circularly polarized blue light reflected by the reflective scattering plate 2919 is collected by the lens group 2918 and then directed to the quarter wave plate 2917. The circularly polarized blue light is transmitted through the quarter wave plate 2917 and converted into S-polarized blue light, which is directed to the flat-plate polarization beam splitter 2903, and the flat-plate polarization beam splitter 2903 reflects it.

[0248] Embodiment 18

[0249] like Fig.30As shown, a lighting device disclosed in this embodiment includes a first light source 3001, a second light source 3002, a first light path adjustment device (composed of a flat-plate polarization beam splitter 3003), a first collecting optical system (composed of a lens group 3004 including a lens 3004a and a lens 3004b), a wavelength conversion device 3005 (comprising a reflection layer 3005a and a wavelength conversion layer 3005b arranged on the reflection layer 3005a), a third light path adjustment device (composed of a flat-plate polarization beam splitter 3006), a quarter wave plate 3007, a second collecting optical system (composed of a lens group 3008 including a lens 3008a and a lens 3008b), a first scattering optical system (composed of a reflective scattering plate 3009) and a focusing optical system (composed of a focusing lens 3010).

[0250] The flat plate polarization beam splitter 3003 in this embodiment has the characteristic of reflecting S-polarized blue light and transmitting P-polarized blue light, and at the same time, the flat plate polarization beam splitter 3003 also reflects yellow light. The flat plate polarization beam splitter 3006 in this embodiment has the characteristic of reflecting S-polarized blue light and transmitting P-polarized blue light, and at the same time, the flat plate polarization beam splitter 3006 also transmits yellow light.

[0251] The first light source 3001 emits a blue light of P polarized light and the blue light is incident on the flat-plate polarization beam splitter 3003. The flat-plate polarization beam splitter 3003 transmits the blue light and then directs it to the flat-plate polarization beam splitter 3006. The flat-plate polarization beam splitter 3006 transmits the blue light and then directs it to the lens group 3004. The lens group 3004 converges the blue light toward the wavelength conversion device 3005. The wavelength conversion device 3005 converts the incident blue light into a first converted light (yellow light) and directs it to the lens group 3004. The first converted light (yellow light) is collected by the lens group 3004 and then directed to the flat-plate polarization beam splitter 3006. The flat-plate polarization beam splitter 3006 transmits the first converted light (yellow light) and then directs it to the flat-plate polarization beam splitter 3003. The flat-plate polarization beam splitter 3003 reflects the blue light.

[0252] The second light source 3002 emits blue light containing an S-polarized light component and a P-polarized light component, and the blue light is incident on the flat-plate polarization beam splitter 3006. The flat-plate polarization beam splitter 3006 separates the blue light into S-polarized blue light and P-polarized blue light, and reflects the S-polarized blue light and transmits the P-polarized blue light. The S-polarized blue light reflected by the flat-plate polarization beam splitter 3006 is emitted to the lens group 3004, and the P-polarized blue light transmitted through the flat-plate polarization beam splitter 3006 is emitted to the quarter-wave plate 3007.

[0253] The lens group 3004 converges the S-polarized blue light from the flat-plate polarization beam splitter 3006 toward the wavelength conversion device 3005. The wavelength conversion device 3005 converts the incident blue light into the second converted light (yellow light) and directs it toward the lens group 3004. The second converted light (yellow light) is collected by the lens group 3004 and then directed toward the flat-plate polarization beam splitter 3006. The flat-plate polarization beam splitter 3006 transmits the second converted light (yellow light) and then directs it toward the flat-plate polarization beam splitter 3003, and the flat-plate polarization beam splitter 3003 reflects it.

[0254] The P-polarized blue light transmitted through the flat-plate polarization beam splitter 3006 is converted into circularly polarized blue light after being transmitted through the quarter-wave plate 3007. The lens group 3008 converges the circularly polarized blue light toward the reflective scattering plate 3009. The circularly polarized blue light is reflected by the reflective scattering plate 3009 and then directed toward the lens group 3008. Then, it is collected by the lens group 3008 and then directed toward the quarter-wave plate 3007. The circularly polarized blue light is transmitted through the quarter-wave plate 3007 and converted into S-polarized blue light. The S-polarized blue light is directed toward the flat-plate polarization beam splitter 3006. The flat-plate polarization beam splitter 3006 reflects the S-polarized blue light and then directs it toward the flat-plate polarization beam splitter 3003, and the flat-plate polarization beam splitter 3003 reflects it.

[0255] The first converted light (yellow light), the second converted light (yellow light) and the S-polarized blue light reflected by the flat polarization beam splitter 3003 are combined into a mixed light and emitted to the focusing lens 3010. The mixed light of the yellow light and the blue light is white light. Finally, the focusing lens 3010 converges the white light and emits it from the lighting device.

[0256] Embodiment 19

[0257] like Fig.31 As shown, a lighting device disclosed in this embodiment includes a first light source 3101, a second light source 3102, a first light path adjustment device (composed of a flat-plate polarization beam splitter 3103), a first collecting optical system (composed of a lens group 3104 including a lens 3104a and a lens 3104b), a wavelength conversion device 3105 (including a reflection layer 3105a and a wavelength conversion layer 3105b arranged on the reflection layer 3105a), a third light path adjustment device (composed of a flat-plate polarization beam splitter 3106), a quarter-wave plate 3107, a second collecting optical system (composed of a lens group 3108 including a lens 3108a and a lens 3108b), a first scattering optical system (composed of a reflective scattering plate 3109), a focusing optical system (composed of a focusing lens 3110) and a half-wave plate 3120.

[0258] The flat-plate polarization beam splitter 3103 in this embodiment has the characteristic of reflecting S-polarized blue light and transmitting P-polarized blue light, and the flat-plate polarization beam splitter 3103 also transmits yellow light. The flat-plate polarization beam splitter 3106 in this embodiment has the characteristic of reflecting S-polarized blue light and transmitting P-polarized blue light, and the flat-plate polarization beam splitter 3106 also transmits yellow light.

[0259] The first light source 3101 emits S-polarized blue light and the blue light enters the flat-plate polarization beam splitter 3103, which reflects the blue light and then directs it toward the half-wave plate 3120. The S-polarized blue light is transmitted through the half-wave plate 3120 and converted into P-polarized blue light, which then continues to direct toward the flat-plate polarization beam splitter 3106, which transmits the blue light and then directs it toward the lens group 3104, which converges the blue light toward the wavelength conversion device 3105. The wavelength conversion device 3105 converts the incident blue light into a first converted light (yellow light) and directs it toward the lens group 3104. The first converted light (yellow light) is collected by the lens group 3104 and then directed toward the flat-plate polarization beam splitter 3106. The flat-plate polarization beam splitter 3106 transmits the first converted light (yellow light) and then directs it toward the half-wave plate 3120. The first converted light (yellow light) is transmitted through the half-wave plate 3120 and then continues to be emitted toward the flat-plate polarization beam splitter 3103, and the flat-plate polarization beam splitter 3103 transmits it.

[0260] The second light source 3102 emits blue light containing an S-polarized light component and a P-polarized light component, and the blue light is incident on the flat-plate polarization beam splitter 3106. The flat-plate polarization beam splitter 3106 separates the blue light into S-polarized blue light and P-polarized blue light, and reflects the S-polarized blue light and transmits the P-polarized blue light. The S-polarized blue light reflected by the flat-plate polarization beam splitter 3106 is emitted to the lens group 3104, and the P-polarized blue light transmitted through the flat-plate polarization beam splitter 3106 is emitted to the quarter-wave plate 3107.

[0261] The lens group 3104 converges the S-polarized blue light from the flat-plate polarization beam splitter 3106 toward the wavelength conversion device 3105. The wavelength conversion device 3105 converts the incident blue light into a second converted light (yellow light) and directs it toward the lens group 3104. The second converted light (yellow light) is collected by the lens group 3104 and then directed toward the flat-plate polarization beam splitter 3106. The flat-plate polarization beam splitter 3106 transmits the second converted light (yellow light) and then directs it toward the half-wave plate 3120. The second converted light (yellow light) transmits through the half-wave plate 3120 and then continues to direct toward the flat-plate polarization beam splitter 3103, and the flat-plate polarization beam splitter 3103 transmits it.

[0262] The P-polarized blue light transmitted through the flat polarization beam splitter 3106 is converted into circularly polarized blue light after being transmitted through the quarter-wave plate 3107. The lens group 3108 converges the circularly polarized blue light toward the reflective scattering plate 3109. The circularly polarized blue light is reflected by the reflective scattering plate 3109 and then directed toward the lens group 3108. Then, the circularly polarized blue light is collected by the lens group 3108 and then directed toward the quarter-wave plate 3107. The circularly polarized blue light is transmitted through the quarter-wave plate 3107 and converted into S-polarized blue light. The S-polarized blue light is directed toward the flat polarization beam splitter 3106. The flat polarization beam splitter 3106 reflects the blue light and then directs the blue light toward the half-wave plate 3120. The S-polarized blue light is transmitted through the half-wave plate 3120 and converted into P-polarized blue light. The P-polarized blue light continues to be directed toward the flat polarization beam splitter 3103, and the flat polarization beam splitter 3103 transmits the blue light.

[0263] The first converted light (yellow light), the second converted light (yellow light) and the P-polarized blue light transmitted through the flat polarization beam splitter 3103 are combined into a mixed light and emitted to the focusing lens 3110. The mixed light of the yellow light and the blue light is white light. Finally, the focusing lens 3110 converges the white light and emits it from the lighting device.

[0264] Embodiment 20

[0265] like Fig.32 As shown, a lighting device disclosed in this embodiment includes a first light source 3201, a second light source 3202, a first light path adjustment device (composed of a flat-plate polarization beam splitter 3203), a first collecting optical system (composed of a lens group 3204 including a lens 3204a and a lens 3204b), a wavelength conversion device 3205 (including a reflection layer 3205a and a wavelength conversion layer 3205b arranged on the reflection layer 3205a), a third light path adjustment device (composed of a flat-plate polarization beam splitter 3206), a quarter-wave plate 3207, a second collecting optical system (composed of a lens group 3208 including a lens 3208a and a lens 3208b), a first scattering optical system (composed of a reflective scattering plate 3209), a focusing optical system (composed of a focusing lens 3210) and a half-wave plate 3220.

[0266] The flat-plate polarization beam splitter 3203 in this embodiment has the characteristic of reflecting S-polarized blue light and transmitting P-polarized blue light, and at the same time, the flat-plate polarization beam splitter 3203 also reflects yellow light. The flat-plate polarization beam splitter 3206 in this embodiment has the characteristic of reflecting S-polarized blue light and transmitting P-polarized blue light, and at the same time, the flat-plate polarization beam splitter 3206 also reflects yellow light.

[0267] The first light source 3201 emits P-polarized blue light and the blue light enters the flat-plate polarization beam splitter 3203, which transmits the blue light and then emits it toward the half-wave plate 3220. The P-polarized blue light is transmitted through the half-wave plate 3220 and converted into S-polarized blue light. The S-polarized blue light continues to emit toward the flat-plate polarization beam splitter 3206, which reflects the blue light and then emits it toward the lens group 3204. The lens group 3204 converges the blue light toward the wavelength conversion device 3205. The wavelength conversion device 3205 converts the incident blue light into a first converted light (yellow light) and emits it toward the lens group 3204. The first converted light (yellow light) is collected by the lens group 3204 and then emitted toward the flat-plate polarization beam splitter 3206. The flat-plate polarization beam splitter 3206 reflects the first converted light (yellow light) and then emits it toward the half-wave plate 3220. The first converted light (yellow light) is transmitted through the half-wave plate 3220 and then continues to be emitted toward the flat-plate polarization beam splitter 3203, and the flat-plate polarization beam splitter 3203 reflects it.

[0268] The second light source 3202 emits blue light containing an S-polarized light component and a P-polarized light component, and the blue light is incident on the flat-plate polarization beam splitter 3206. The flat-plate polarization beam splitter 3206 separates the blue light into S-polarized blue light and P-polarized blue light, and reflects the S-polarized blue light and transmits the P-polarized blue light. The P-polarized blue light transmitted through the flat-plate polarization beam splitter 3206 is emitted toward the lens group 3204, and the S-polarized blue light reflected by the flat-plate polarization beam splitter 3206 is emitted toward the quarter-wave plate 3207.

[0269] The lens group 3204 converges the blue light of the P polarized light from the flat-plate polarization beam splitter 3206 toward the wavelength conversion device 3205. The wavelength conversion device 3205 converts the incident blue light into the second converted light (yellow light) and directs it toward the lens group 3204. The second converted light (yellow light) is collected by the lens group 3204 and then directed toward the flat-plate polarization beam splitter 3206. The flat-plate polarization beam splitter 3206 reflects the second converted light (yellow light) and then directs it toward the half-wave plate 3220. The second converted light (yellow light) is transmitted through the half-wave plate 3220 and then continues to direct toward the flat-plate polarization beam splitter 3203, and the flat-plate polarization beam splitter 3203 reflects it.

[0270] The S-polarized blue light reflected by the flat polarization beam splitter 3206 is converted into circularly polarized blue light after passing through the quarter-wave plate 3207. The lens group 3208 converges the circularly polarized blue light toward the reflective scattering plate 3209. The circularly polarized blue light is reflected by the reflective scattering plate 3209 and then directed toward the lens group 3208. Then, the circularly polarized blue light is collected by the lens group 3208 and then directed toward the quarter-wave plate 3207. The circularly polarized blue light is converted into P-polarized blue light after passing through the quarter-wave plate 3207. The P-polarized blue light is directed toward the flat polarization beam splitter 3206. The flat polarization beam splitter 3206 transmits the blue light and then directs the blue light toward the half-wave plate 3220. The P-polarized blue light is converted into S-polarized blue light after passing through the half-wave plate 3220. The S-polarized blue light continues to direct toward the flat polarization beam splitter 3203, and the flat polarization beam splitter 3203 reflects the blue light.

[0271] The first converted light (yellow light), the second converted light (yellow light) and the S-polarized blue light reflected by the flat polarization beam splitter 3203 are combined into a mixed light and emitted to the focusing lens 3210. The mixed light of the yellow light and the blue light is white light. Finally, the focusing lens 3210 converges the white light and emits it from the lighting device.

Claims

1. A lighting device, characterized in that: It includes a first light source, a second light source, a first light path adjustment device, a second light path adjustment device, a wavelength conversion device and a first scattering optical system, wherein: The first light source is used to emit light in a first wavelength band; The second light source is used to emit light of a second wavelength band, and the second wavelength band is the same as or different from the first wavelength band; The first optical path adjustment device receives the light of the first wavelength band emitted from the first light source and causes the light to be at least partially transmitted or at least partially reflected; When the first optical path adjusting device causes the light of the first wavelength band emitted by the first light source to at least partially transmit, the first optical path adjusting device receives the light of the second wavelength band from the second optical path adjusting device and reflects it, the wavelength conversion device receives the light of the first wavelength band transmitted through the first optical path adjusting device and the light of the second wavelength band reflected by the first optical path adjusting device, converts the light of the first wavelength band into a first converted light whose wavelength band is different from the first wavelength band, and converts the light of the second wavelength band into a second converted light whose wavelength band is different from the second wavelength band; the first optical path adjusting device reflects the first converted light and the second converted light from the wavelength conversion device, and the first converted light and the second converted light are emitted toward the second optical path adjusting device; When the first optical path adjusting device causes the light of the first wavelength band emitted by the first light source to at least partially reflect, the first optical path adjusting device receives the light of the second wavelength band from the second optical path adjusting device and transmits it, the wavelength conversion device receives the light of the first wavelength band reflected by the first optical path adjusting device and the light of the second wavelength band transmitted through the first optical path adjusting device, converts the light of the first wavelength band into a first converted light whose wavelength band is different from the first wavelength band, and converts the light of the second wavelength band into a second converted light whose wavelength band is different from the second wavelength band; the first optical path adjusting device causes the first converted light and the second converted light from the wavelength conversion device to transmit, and the first converted light and the second converted light are emitted toward the second optical path adjusting device; The second optical path adjusting device receives the light of the second wavelength band emitted from the second light source, makes it partially transmitted and partially reflected, and then emits from a different optical path; the first optical path adjusting device receives the light of the second wavelength band emitted from one of the optical paths; the first scattering optical system receives the light of the second wavelength band emitted from the other optical path, reflects it and forms scattered light of the second wavelength band; the second optical path adjusting device combines the first converted light and the second converted light from the first optical path adjusting device with at least part of the photosynthetic light of the second wavelength band from the first scattering optical system, and emits them from the same optical path.

2. A lighting device according to claim 1, characterized in that: The first optical path adjustment 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 first band and the second band: it reflects the S polarization light of the first band and the second band and transmits the P polarization light of the first band and the second band; the first polarization beam splitter has the following second characteristic with respect to the first converted light and the second converted light: it transmits or reflects the first converted light and the second converted light.

3. The lighting device according to claim 1, characterized in that: The second optical path adjustment device is a second polarization beam splitter, and the second polarization beam splitter has the following first characteristic with respect to the incident light of the second wavelength band: it reflects the S polarization light of the second wavelength band and transmits the P polarization light of the second wavelength band; the second polarization beam splitter has the following second characteristic with respect to the first converted light and the second converted light: it transmits or reflects the first converted light and the second converted light.

4. The lighting device according to claim 1, characterized in that: It also includes a first quarter wave plate, which is located on the optical path between the second optical path adjusting device and the first scattering optical system.

5. The lighting device according to claim 1, characterized in that: It also includes a half-wave plate, which is located on the optical path between the first optical path adjusting device and the second optical path adjusting device.

6. The lighting device according to claim 1, characterized in that: The first light source includes N first lasers and N first collimating elements corresponding to the N first lasers, N≥1, wherein: The first laser is used to emit light in the first wavelength band; The first collimating element is integrated into the first laser or arranged outside the first laser, and is used for collimating the light of the first wavelength band emitted by the first laser.

7. The lighting device according to claim 1, characterized in that: The second light source includes M second lasers and M second collimating elements corresponding to the M second lasers one by one, M≥1, wherein: The second laser is used to emit light in the second wavelength band; The second collimating element is integrated into the second laser or arranged outside the second laser, and is used for collimating the light of the second wavelength band emitted by the second laser.

8. The lighting device according to claim 7, characterized in that: The light in the second wavelength band emitted by the second laser is linearly polarized light, wherein: The light emission directions of all the second lasers are the same, and the initial polarization directions of the light emitted by all the second lasers are also the same. Taking the light emission direction of the second laser as the axis, a part of the second lasers in the second light source is axially rotated to change the polarization direction of the light of the second wavelength band emitted by this part of the second lasers, so that when the light of the second wavelength band emitted by the second light source enters the second optical path adjustment device, it contains an S polarized light component and a P polarized light component; Alternatively, the light emission directions of all the second lasers are the same, the polarization directions of the light emitted by all the second lasers are also the same, and the second light source is axially rotated with the light emission direction of the second laser as the axis, so that when the light of the second wavelength band emitted by the second light source is incident on the second optical path adjustment device, it contains an S polarized light component and a P polarized light component; Alternatively, all the second lasers have the same light emission direction, and a wave plate is provided in the second light source, and the polarization direction or polarization state of the light in the second wavelength band emitted by all or part of the second lasers in the second light source is changed by the wave plate, so that when the light in the second wavelength band emitted by the second light source enters the second optical path adjustment device, it contains an S-polarized light component and a P-polarized light component; Or it further includes a polarization selection element, the characteristic of which is to reflect the S polarized light of the second band and transmit the P polarized light of the second band, at least one of the second lasers in the second light source is used to emit the S polarized light of the second band to form incident light one, and the remaining second lasers in the second light source are used to emit the P polarized light of the second band to form incident light two, and the incident light one and the incident light two are combined into one light by the polarization selection element and then emitted, so that when the light of the second band emitted by the second light source is incident on the second optical path adjustment device, it contains S polarized light components and P polarized light components.

9. The lighting device according to claim 1, characterized in that: The first scattering optical system is composed of a first reflective scattering plate, or a first transmissive scattering plate and a first reflecting mirror.

10. The lighting device according to claim 1, characterized in that: It also includes a first collecting optical system, which is located on the optical path between the first optical path adjusting device and the wavelength conversion device, and is used to converge the light of the first wavelength band and the light of the second wavelength band from the first optical path adjusting device toward the wavelength conversion device, and at the same time to collect the first converted light and the second converted light from the wavelength conversion device and direct them toward the first optical path adjusting device.

11. The lighting device according to claim 1, characterized in that: It also includes a second collecting optical system, which is located on the optical path between the second optical path adjusting device and the first scattering optical system, and is used to converge the light of the second wavelength band from the second optical path adjusting device toward the first scattering optical system, and at the same time to collect the light of the second wavelength band from the first scattering optical system and direct it toward the second optical path adjusting device.

12. The lighting device according to claim 1, characterized in that: It also includes a first light homogenization optical system, which is located on the optical path from the first light source to the first light path adjustment device and is used to homogenize the light of the first wavelength band emitted by the first light source.

13. The lighting device according to claim 1, characterized in that: It also includes a second light homogenization optical system, which is located on the optical path from the second light source to the second light path adjustment device and is used to homogenize the light of the second wavelength band emitted by the second light source.

14. The lighting device according to claim 1, characterized in that: It also includes a focusing optical system for converging the light emitted from the second optical path adjusting device.

15. The lighting device according to claim 1, characterized in that: It also includes a first lens group, which is located on the optical path from the first light source to the first optical path adjustment device and is used to reduce the light beam formed by the light of the first wavelength band emitted by the first light source.

16. The lighting device according to claim 1, characterized in that: It also includes a second lens group, which is located on the optical path from the second light source to the second optical path adjusting device and is used to reduce the light beam formed by the light of the second wavelength band emitted by the second light source.

17. The lighting device according to claim 1, characterized in that: It also includes a reflecting element, which is located on the optical path between the second light source and the second optical path adjusting device, and has a transmission area and a reflection area, the transmission area allows the light of the second wavelength band to pass or transmit through, and the reflection area is used to reflect the light of the second wavelength band from the second optical path adjusting device and make at least part of the light therein return to the second optical path adjusting device.

18. The lighting device according to claim 17, characterized in that: It also includes a light-guiding optical system, which is located on the optical path from the second light source to the second optical path adjusting device, and is used to guide at least part of the light of the second wavelength band emitted by the second light source to pass through or transmit through the transmission area of ​​the reflective element and then be incident on the second optical path adjusting device.

19. The lighting device according to claim 1, characterized in that: It also includes a second scattering optical system, wherein the first optical path adjusting device allows the light of the first wavelength band emitted by the first light source to be partially transmitted and partially reflected and then emitted from different optical paths, the wavelength conversion device receives the light of the first wavelength band emitted from one of the optical paths, and the second scattering optical system receives the light of the first wavelength band emitted from the other optical path, reflects it and forms scattered light of the first wavelength band; the first optical path adjusting device combines the first converted light and the second converted light from the wavelength conversion device with at least part of the photosynthetic light of the first wavelength band from the second scattering optical system and emits them to the second optical path adjusting device, and the second optical path adjusting device combines the first converted light, the second converted light and the light of the first wavelength band from the first optical path adjusting device with at least part of the photosynthetic light of the second wavelength band from the first scattering optical system and emits them from the same optical path.

20. The lighting device according to claim 19, characterized in that: The second scattering optical system is composed of a second reflective scattering plate, or a second transmissive scattering plate and a second reflecting mirror.

21. The lighting device according to claim 19, characterized in that: It also includes a third collecting optical system, which is located on the optical path between the first optical path adjusting device and the second scattering optical system, and is used to converge the light of the first wavelength band from the first optical path adjusting device toward the second scattering optical system, and at the same time to collect the light of the first wavelength band from the second scattering optical system and direct it toward the first optical path adjusting device.

22. The lighting device according to claim 19, characterized in that: It also includes a second quarter-wave plate, which is located on the optical path between the first optical path adjusting device and the second scattering optical system.

23. A lighting device, characterized in that: It includes a first light source, a second light source, a first light path adjustment device, a third light path adjustment device, a wavelength conversion device and a first scattering optical system, wherein: The first light source is used to emit light in a first wavelength band; The second light source is used to emit light of a second wavelength band, and the second wavelength band is the same as or different from the first wavelength band; The third optical path adjustment device receives the light of the second wavelength band emitted from the second light source, and transmits part of it and reflects part of it, and then emits it from different optical paths; the wavelength conversion device receives the light of the second wavelength band emitted from one of the optical paths, and converts it into a second converted light, and the wavelength band of the second converted light is different from the second wavelength band; the first scattering optical system receives the light of the second wavelength band emitted from another optical path, and reflects it to form scattered light of the second wavelength band; the third optical path adjustment device also receives the light of the first wavelength band from the first optical path adjustment device, and transmits or reflects it before being received by the wavelength conversion device, and the wavelength conversion device converts it into a first converted light, and the wavelength band of the first converted light is different from the first wavelength band; the third optical path adjustment device combines the first converted light and the second converted light from the wavelength conversion device with at least part of the light of the second wavelength band from the first scattering optical system, and then emits them from the same optical path, and the combined light is emitted toward the first optical path adjustment device; The first optical path adjustment device receives the light of the first wavelength band emitted from the first light source and causes the light to be at least partially transmitted or at least partially reflected; When the first optical path adjusting device causes the light of the first wavelength band emitted by the first light source to at least partially transmit, the light of the first wavelength band transmitted through the first optical path adjusting device is emitted toward the third optical path adjusting device; the first optical path adjusting device receives the combined light of the first converted light, the second converted light, and the light of the second wavelength band from the third optical path adjusting device and reflects it; When the first optical path adjusting device causes the light of the first wavelength band emitted by the first light source to at least partially reflect, the light of the first wavelength band reflected by the first optical path adjusting device is emitted to the third optical path adjusting device; the first optical path adjusting device receives the combined light of the first converted light, the second converted light and the light of the second wavelength band from the third optical path adjusting device and transmits it.

24. A lighting device according to claim 23, characterized in that: The first optical path adjustment 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 first band and the second band: it reflects the S polarization light of the first band and the second band and transmits the P polarization light of the first band and the second band; the first polarization beam splitter has the following second characteristic with respect to the first converted light and the second converted light: it transmits or reflects the first converted light and the second converted light.

25. The lighting device according to claim 23, characterized in that: The third optical path adjustment device is a third polarization beam splitter, and the third polarization beam splitter has the following first characteristic with respect to the incident light of the first band and the second band: it reflects the S polarized light of the first band and the second band and transmits the P polarized light of the first band and the second band; the third polarization beam splitter has the following second characteristic with respect to the first converted light and the second converted light: it transmits or reflects the first converted light and the second converted light.

26. The lighting device according to claim 23, characterized in that: It also includes a first quarter wave plate, which is located on the optical path between the third optical path adjusting device and the first scattering optical system.

27. The lighting device according to claim 23, characterized in that: It also includes a half-wave plate, which is located on the optical path between the first optical path adjusting device and the third optical path adjusting device.

28. The lighting device according to claim 23, characterized in that: The first light source includes N first lasers and N first collimating elements corresponding to the N first lasers, N≥1, wherein: The first laser is used to emit light in the first wavelength band; The first collimating element is integrated into the first laser or arranged outside the first laser, and is used for collimating the light of the first wavelength band emitted by the first laser.

29. The lighting device according to claim 23, characterized in that: The second light source includes M second lasers and M second collimating elements corresponding to the M second lasers one by one, M≥1, wherein: The second laser is used to emit light in the second wavelength band; The second collimating element is integrated into the second laser or arranged outside the second laser, and is used for collimating the light of the second wavelength band emitted by the second laser.

30. The lighting device according to claim 29, characterized in that: The light in the second wavelength band emitted by the second laser is linearly polarized light, wherein: The light emission directions of all the second lasers are the same, and the initial polarization directions of the light emitted by all the second lasers are also the same. Taking the light emission direction of the second laser as the axis, a part of the second lasers in the second light source is axially rotated to change the polarization direction of the light of the second wavelength band emitted by this part of the second lasers, so that when the light of the second wavelength band emitted by the second light source enters the third optical path adjustment device, it contains an S polarized light component and a P polarized light component; Alternatively, the light emission directions of all the second lasers are the same, the polarization directions of the light emitted by all the second lasers are also the same, and the second light source is axially rotated with the light emission direction of the second laser as the axis, so that when the light of the second wavelength band emitted by the second light source is incident on the third optical path adjustment device, it contains an S polarized light component and a P polarized light component; Alternatively, all the second lasers have the same light emission direction, a wave plate is provided in the second light source, and the polarization direction or polarization state of the light in the second wavelength band emitted by all or part of the second lasers in the second light source is changed by the wave plate, so that when the light in the second wavelength band emitted by the second light source enters the third optical path adjustment device, it contains an S polarized light component and a P polarized light component; Or it also includes a polarization selection element, the characteristic of which is to reflect the S polarized light of the second band and transmit the P polarized light of the second band, at least one of the second lasers in the second light source is used to emit the S polarized light of the second band to form incident light one, and the remaining second lasers in the second light source are used to emit the P polarized light of the second band to form incident light two, and the incident light one and the incident light two are combined into one light by the polarization selection element and then emitted, so that when the light of the second band emitted by the second light source is incident on the third optical path adjustment device, it contains S polarized light components and P polarized light components.

31. The lighting device according to claim 23, characterized in that: The first scattering optical system is composed of a first reflective scattering plate, or a first transmissive scattering plate and a first reflecting mirror.

32. A lighting device according to claim 23, characterized in that: It also includes a first collecting optical system, which is located on the optical path between the third optical path adjusting device and the wavelength conversion device, and is used to converge the light of the first wavelength band and the light of the second wavelength band from the third optical path adjusting device toward the wavelength conversion device, and at the same time to collect the first converted light and the second converted light from the wavelength conversion device and direct them toward the third optical path adjusting device.

33. The lighting device according to claim 23, characterized in that: It also includes a second collecting optical system, which is located on the optical path between the third optical path adjusting device and the first scattering optical system, and is used to converge the light of the second wavelength band from the third optical path adjusting device toward the first scattering optical system, and at the same time to collect the light of the second wavelength band from the first scattering optical system and direct it toward the third optical path adjusting device.

34. A lighting device according to claim 23, characterized in that: It also includes a first light homogenization optical system, which is located on the optical path from the first light source to the first light path adjustment device and is used to homogenize the light of the first wavelength band emitted by the first light source.

35. The lighting device according to claim 23, characterized in that: It also includes a second light uniforming optical system, which is located on the optical path from the second light source to the third light path adjustment device and is used to uniformly distribute the light of the second wavelength band emitted by the second light source.

36. The lighting device according to claim 23, characterized in that: It also includes a focusing optical system for converging the light emitted from the first optical path adjusting device.

37. A lighting device according to claim 23, characterized in that: It also includes a first lens group, which is located on the optical path from the first light source to the first optical path adjustment device and is used to reduce the light beam formed by the light of the first wavelength band emitted by the first light source.

38. A lighting device according to claim 23, characterized in that: It also includes a second lens group, which is located on the optical path from the second light source to the third optical path adjustment device and is used to reduce the light beam formed by the light of the second wavelength band emitted by the second light source.

39. The lighting device according to claim 23, characterized in that: It also includes a reflecting element, which is located on the optical path between the second light source and the third optical path adjusting device. The reflecting element has a transmission area and a reflection area. The transmission area allows the light of the second wavelength band to pass or transmit through, and the reflection area is used to reflect the light of the second wavelength band from the third optical path adjusting device and make at least part of the light therein reflected back to the third optical path adjusting device.

40. A lighting device according to claim 39, characterized in that: It also includes a light-guiding optical system, which is located on the optical path from the second light source to the third optical path adjusting device, and is used to guide at least part of the light of the second wavelength band emitted by the second light source to pass through or transmit through the transmission area of ​​the reflective element and then be incident on the third optical path adjusting device.

41. A lighting device according to claim 23, characterized in that: It also includes a second scattering optical system, wherein the first optical path adjusting device allows the light of the first wavelength band emitted by the first light source to be partially transmitted and partially reflected and then emitted from a different optical path, the third optical path adjusting device receives the light of the first wavelength band emitted from one of the optical paths, and the second scattering optical system receives the light of the first wavelength band emitted from the other optical path, reflects it and forms scattered light of the first wavelength band; the first optical path adjusting device combines the first converted light, the second converted light and the light of the second wavelength band from the third optical path adjusting device with at least part of the light of the first wavelength band from the second scattering optical system and emits them from the same optical path.

42. A lighting device according to claim 41, characterized in that: The second scattering optical system is composed of a second reflective scattering plate, or a second transmissive scattering plate and a second reflecting mirror.

43. A lighting device according to claim 41, characterized in that: It also includes a third collecting optical system, which is located on the optical path between the first optical path adjusting device and the second scattering optical system, and is used to converge the light of the first wavelength band from the first optical path adjusting device toward the second scattering optical system, and at the same time to collect the light of the first wavelength band from the second scattering optical system and direct it toward the first optical path adjusting device.

44. A lighting device according to claim 41, characterized in that: It also includes a second quarter-wave plate, which is located on the optical path between the first optical path adjusting device and the second scattering optical system.

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