Light-combining assembly, light source module, and projection device

Abstract

A light-combining assembly (10), a light source module, and a projection device. The light-combining assembly (10) comprises an assembly body. The assembly body has a first light-adjusting surface (110) and a second light-adjusting surface (120). The first light-adjusting surface (110) comprises a first region (111). The second light-adjusting surface (120) comprises a second region (121) and a third region (122) which surrounds the second region (121). The first region (111) and the third region (122) are reflection regions of the same target waveband light beam, and the second region (121) is a transmission region of the target waveband light beam. The first region (111) and the second region (121) are arranged as overlapping to separate a light-combining channel (C), a first light incident channel (L1), and a second light incident channel (L2) opposite to the first light incident channel (L1).

Description

Light combining components, light source modules and projection equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202211476015.6, filed on November 23, 2022, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure belongs to the field of optoelectronic technology and relates to a light combining component, a light source module and a projection device. Background Art

[0004] With the advancement of optoelectronic technology, many electronic devices are inseparable from optical systems. In some optical systems, it is necessary to combine light from different optical paths. However, current light combining methods, such as using dichroic mirrors, can only combine beams with relatively large spectral separations and cannot combine beams with identical or similar spectra.

[0005] Summary of the Invention

[0006] In a first aspect of the present disclosure, a light-combining component is provided, comprising: a component body, the component body having a first dimming surface and a second dimming surface, the first dimming surface comprising: a first area, the second dimming surface comprising: a second area and a third area surrounding the second area, wherein: the first area and the third area are reflection areas of the same target band light beam, and the second area is a transmission area of ​​the target band light beam; the first area and the second area are arranged to overlap, dividing a light-combining channel, a first light input channel and a second light input channel opposite to the first light input channel; a first light beam incident from the first light input channel to the first area is reflected by the first area and transmitted to the light-combining channel; a second light beam incident from the second light input channel to the third area is reflected by the third area and transmitted to the light-combining channel.

[0007] In a second aspect of the present disclosure, a light source module is provided, comprising: a first light source assembly, a second light source assembly, and the light combining assembly described in the first aspect, wherein: the first light source assembly is used to output a first light beam, and allows the first light beam to be incident from a first light input channel to a first area of ​​the light combining assembly, and is reflected from the first area to the light combining channel for output; the second light source assembly is used to output a second light beam, and allows the second light beam to be incident from a second light input channel to a third area of ​​the light combining assembly, and is reflected from the third area to the light combining channel for output.

[0008] In a third aspect of the present disclosure, a projection device is provided, comprising: a light valve, a projection lens, and the light source module described in the second aspect, wherein the illumination light beam output by the light source module passes through the light valve and the projection lens before being output.

[0009] The above description is only an overview of the technical solution provided by the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other features and effects of the present disclosure more obvious and easy to understand, the implementation methods of the present disclosure are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 shows a schematic structural diagram of a light combining assembly according to some embodiments of the present disclosure;

[0011] FIG2 shows a schematic structural diagram of a light combining assembly according to other embodiments of the present disclosure;

[0012] FIG3 shows a schematic structural diagram of a light combining assembly according to some other embodiments of the present disclosure;

[0013] FIG4 shows a plan view of a first dimming surface and a second dimming surface according to some embodiments of the present disclosure;

[0014] FIG5 shows a schematic structural diagram of a light combining assembly according to some further embodiments of the present disclosure;

[0015] FIG6 shows a schematic structural diagram of a light combining assembly according to some other embodiments of the present disclosure;

[0016] FIG7 shows a schematic structural diagram of a light source module according to some embodiments of the present disclosure;

[0017] FIG8 shows a schematic structural diagram of a light source module according to other embodiments of the present disclosure; and

[0018] FIG9 shows a schematic structural diagram of a projection device according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0019] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that in the accompanying drawings, the sizes of the elements may be exaggerated for clarity of illustration. Although the accompanying drawings show exemplary embodiments of the present disclosure, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0020] It should be noted that the term "plurality" used herein includes two or more than two. Terms such as "first," "second," and "third" are used merely as markers and do not limit the number or order of their objects. The term "and / or" simply describes an association between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone.

[0021] Some embodiments of the present disclosure provide a light combining component that can combine light beams with the same or similar spectra. The light combining component can be used in a projection lighting system. In a projection lighting system, two light sources of the same color are equipped, and the light beams provided by the two light sources are combined and output using the light combining component provided by some embodiments of the present disclosure, which can effectively increase the luminous flux of the color light beam, thereby improving the system lighting brightness. Of course, in addition to being used in projection lighting systems, the light combining component can also be used in other applicable optical systems, and this embodiment does not limit this.

[0022] Figure 1 illustrates a schematic diagram of a light-combining assembly according to some embodiments of the present disclosure. As shown in Figure 1 , the light-combining assembly 10 may include a main assembly body having a first dimming surface 110 and a second dimming surface 120. The first dimming surface 110 and the second dimming surface 120 are surfaces capable of selectively reflecting and transmitting light beams of specific wavelengths.

[0023] In some embodiments, the first dimming surface 110 includes a first region 111. The second dimming surface 120 includes a second region 121 and a third region 122 surrounding the second region 121. The first region 111 and the third region 122 reflect light beams in the same target wavelength band, while the second region 121 transmits the target wavelength band. For example, the first dimming surface 110 and the second dimming surface 120 can be coated in different regions: the first region 111 and the third region 122 are coated with a functional coating layer for reflecting light beams in the target wavelength band, while the second region 121 is coated with an antireflection coating layer.

[0024] The target band is the band in which the light combining component 10 can achieve light combining through reflection from the reflective area. In practice, the functional film layers of the first area 111 and the third area 122 serving as the reflective area need to be configured so that their corresponding target bands are adapted to the wavelength range of the light beams to be combined. In some embodiments, the wavelength ranges of the two light beams to be combined are: λ1~λ2, λ3~λ4, respectively, wherein λ3 is greater than λ1 and less than λ2, and λ4 is greater than λ2, then the target band needs to include at least: λ1~λ4. In some embodiments, if the light combining component 10 is used to combine two red light beams, then the target band may be a red light band. Similarly, in other embodiments, the target band may also be a blue light band, a green light band, or a yellow light band, etc., which is not limited in this embodiment.

[0025] The second region 121 serves as a transmission area for the target wavelength band light beam. Its transmission range can include only the target wavelength band or the entire wavelength band, depending on the needs of the actual application scenario, and this embodiment does not impose any restrictions on this. In some embodiments, the second region 121 can be an open area or a transparent material area.

[0026] Thus, the first dimming surface 110 and the second dimming surface 120 can have a zoned reflection characteristic for the target wavelength band light beam, that is, reflection in the first area 111 , transmission in the second area 121 , and reflection in the third area 122 .

[0027] For ease of explanation, the two light beams to be combined are referred to herein as the first light beam and the second light beam, respectively. The wavelength ranges of the first light beam and the second light beam must both fall within the target wavelength band described above. In some embodiments, the wavelength ranges of the first light beam and the second light beam may be the same or partially overlap. In other embodiments, the wavelength ranges of the first light beam and the second light beam may be separated from each other, but the degree of separation is relatively small, and both fall within the target wavelength band described above.

[0028] In the light-combining assembly 10, the first region 111 and the second region 121 overlap to define a first light input channel L1, a second light input channel L2, and a light-combining channel C located on the same side of the first dimming surface 110 as the first light input channel L1. In practice, by configuring the areas of the first region 111, the second region 121, and the third region 122, as well as the overlap between the first region 111 and the second region 121, at least a portion of a first light beam incident on the first region 111 can be reflected by the first region 111 and transmitted to the light-combining channel C. At least a portion of a second light beam incident on the third region 122 can be reflected by the third region 122 and transmitted to the light-combining channel C, where it is combined with the first light beam transmitted to the light-combining channel C.

[0029] During use, a first light beam can be input from the first light input channel L1, and a second light beam can be input from the second light input channel L2. The first light beam incident on the first region 111 from the first light input channel L1 is reflected by the first region 111 and then transmitted to the light combining channel C. The second light beam incident on the third region 122 from the second light input channel L2 is reflected by the third region 122 and then transmitted to the light combining channel C, thereby combining the first and second light beams with the same or similar spectra.

[0030] Some embodiments of the present disclosure achieve light combination of light beams with the same or similar spectra by setting reflective areas in two dimming surfaces and making the reflective area of ​​the first dimming surface 110 overlap with the transmissive area of ​​the second dimming surface 120.

[0031] In some embodiments, considering that the first light beam is reflected by the first area 111 overlapping with the second area 121, and the second light beam is reflected by the third area 122 located outside the second area 121, in practice, the beam diameter of the first light beam can be relatively small, so that the light spot irradiated to the first dimming surface 110 does not exceed the first area 111 as much as possible, thereby reducing unnecessary light loss; and the beam diameter of the second light beam can be relatively large, so that the light spot irradiated to the second dimming surface 120 at least partially overlaps with the third area 122, thereby increasing the combined luminous flux of the second light beam.

[0032] In some embodiments, the energy density of the first light beam, which has a relatively small beam diameter, can be maximized to improve the combined brightness. In some embodiments, the first light beam can be emitted by a laser light source, or a fluorescent light beam generated by pump laser excitation; the second light beam can be emitted by an LED (Light-Emitting Diode) light source. Taking the combination of red light beams as an example, the first light beam can be output by a red laser light source, and the second light beam can be output by a red LED light source.

[0033] It should be noted that, on the basis of realizing the combination of the first light beam and the second light beam, the characteristic of the above-mentioned light combining component 10 in transmitting light beams of other bands can also be utilized to realize the optical path coupling of the first light beam and the combined light beam of the second light beam with light beams of other bands. In some embodiments, if the target band is the red light band, that is, the first light beam and the second light beam are both red light beams, the first dimming surface 110 and the second dimming surface 120 are also configured to transmit at least one of the light beams in the blue light and green light bands. Figure 2 shows a structural schematic diagram of the light combining component according to other embodiments of the present disclosure. As shown in Figure 2, the spatial area opposite to the light combining channel C can be used as a third light input channel L3. The blue light beam and / or green light beam input from the third light input channel L3 can be transmitted to the light combining channel C through the light combining component 10, and combined with the two red light beams transmitted to the light combining channel C.

[0034] In some embodiments, the first dimming surface 110 can be perpendicular to the second dimming surface 120, so that the first area 111 is perpendicular to the second area 121 and the third area 122, so as to simplify the optical path design of the incident light and achieve coaxial output of the combined light beam. It should be noted that the vertical here can be understood as a broad vertical, that is, within the actual acceptable error range, the intersection angle can also have a certain deviation from 90 degrees representing absolute verticality, for example, it can be 89 degrees, 89.5 degrees, 90 degrees, 90.5 degrees or 91 degrees, etc., and this embodiment does not limit this.

[0035] In some embodiments, by configuring the overlapping position of the first region 111 and the second region 121, the first region 111 can be divided by the second region 121 into two sub-regions located on either side of the second dimming surface 120, and the second region 121 can be divided by the first region 111 into two sub-regions located on either side of the first dimming surface 110. In some embodiments, the shapes of the first region 111 and the second region 121 can both be axially symmetrical figures, such as circles or squares. In this case, they can be divided into two mutually symmetrical sub-regions along their central axis. This can minimize light loss and improve combined light brightness, while also allowing the component optical axis to be designed at the center, thereby simplifying the optical path design.

[0036] FIG3 shows a schematic diagram of the structure of a light-combining assembly according to further embodiments of the present disclosure. As shown in FIG1 and FIG3, the first region 111 includes a first sub-region 111a and a second sub-region 111b located on either side of the second dimming surface 120, respectively. The second region 121 includes a third sub-region 121a and a fourth sub-region 121b located on either side of the first dimming surface 110, respectively. The third region 122 includes a fifth sub-region 122a and a sixth sub-region 122b located on either side of the first dimming surface 110, respectively. When combining the first light beam and the second light beam, the incident position of the first light beam and the incident position of the second light beam can be adjusted so that a part of the first light beam incident from the first light input channel L1 is incident on the first sub-region 111a, is reflected by the first sub-region 111a, and then passes through the third sub-region 121a to enter the combining channel C for output, and the other part passes through the third sub-region 121a to enter the second sub-region 111b, and then is reflected by the second sub-region 111b to be outputted from the combining channel C; a part of the second light beam incident from the second light input channel L2 is reflected by the fifth sub-region 122a to be outputted from the combining channel C, and a part is reflected by the sixth sub-region 122b to be outputted from the combining channel C.

[0037] It should be noted that although a portion of the second light beam will be reflected by the second sub-region 111b and reflected by the first sub-region 111a through the fourth sub-region 121b and lost, when the energy density of the first light beam is greater than the energy density of the second light beam, the lost luminous flux is less than the luminous flux of the first light beam reflected to the combined light channel C through the first region 111. At this time, the brightness of the combined light beam is greater than that of a single second light beam. Of course, when the beam diameter of the first light beam can be adapted, the smaller the area of ​​the first region 111 and the second region 121, the less energy of the second light beam will be lost. Therefore, in practice, the area of ​​the first region 111 and the second region 121 can be minimized while comprehensively considering the beam diameter of the first light beam and the alignment accuracy.

[0038] It can be understood that when the first dimming surface 110 is set vertically to the second dimming surface 120, by adjusting the incident angles of the first light beam and the second light beam to 45 degrees, and adjusting the light output positions of the corresponding light sources so that the optical axis of the first light beam coincides with the optical axis of the second light beam, the first light beam reflected by the first area 111 and the second light beam reflected by the third area 122 can be coaxially output in the combined light channel C.

[0039] In some embodiments, the overlap between the reflective region and the transmissive region between the first dimming surface 110 and the second dimming surface affects, to a certain extent, the brightness of the combined light output by the light combining assembly 10. Below, the overlap between each reflective region and the corresponding transmissive region is described based on the orthographic projection relationship of each sub-region on the first reference plane 200 and the second reference plane 300 shown in FIG3 as reference planes.

[0040] When the first region 111 is perpendicular to the second region 121 and the third region 122, the optical axis of the first light beam coincides with the optical axis of the second light beam. Then, the optical axis of the combined light beam obtained after reflection is perpendicular to the optical axes of the first light beam and the second light beam. As shown in Figure 3, the first reference plane 200 can be a plane perpendicular to the optical axis of the combined light channel C. The second reference plane 300 is a plane perpendicular to the optical axis of the first light input channel L1. It should be noted that the optical axis of the above-mentioned optical channel is the optical axis of the light beam transmitted in the optical channel.

[0041] For ease of explanation, the orthographic projection of the first sub-region 111a on the first reference plane 200 is defined as the first projection area, and the orthographic projection of the third sub-region 121a on the first reference plane 200 is defined as the second projection area. Considering that the portion of the first light beam incident on the first sub-region 111a needs to pass through the second dimming surface 120 after being reflected by the first sub-region 111a before entering the light combining channel C, in some embodiments, the first projection area can be located within the second projection area, or substantially overlap with the second projection area. It should be noted that the substantial overlap described herein refers to complete overlap, or there is a certain deviation, and the light loss caused by the deviation is within an acceptable range.

[0042] This allows the portion of the first light beam incident on the first sub-area 111a to pass through the third sub-area 121a and be transmitted to the light-combining channel C, thereby reducing light loss in the first light beam and improving the combined light brightness. Furthermore, the first projection area and the second projection area substantially overlap, which helps reduce the area of ​​the second area 121 and increase the area of ​​the third area 122, thereby increasing the combined light flux of the second light beam.

[0043] In some embodiments, in order to avoid the second sub-region 111b blocking the portion of the second light beam reflected by the fifth sub-region 122a, resulting in unnecessary light loss, the orthographic projection of the fifth sub-region 122a on the first reference plane 200 and the orthographic projection of the second sub-region 111b on the first reference plane 200 do not overlap with each other, so that the portion of the second light beam reflected by the fifth sub-region 122a can be transmitted to the light combining channel C, thereby reducing the light loss of the second light beam and improving the light combining brightness.

[0044] For ease of explanation, the orthographic projection of the second sub-region 111b on the second reference plane 300 is defined as the third projection area, and the orthographic projection of the third sub-region 121a on the second reference plane 300 is defined as the fourth projection area. Taking into account that a portion of the first light beam needs to pass through the second dimming surface 120 before it can be incident on the second sub-region 111b, in some embodiments, the third projection area can be located within the fourth projection area, or substantially overlap with the fourth projection area. In this way, the first light beam incident on the second sub-region 111b can all pass through the second dimming surface 120 to be incident on the second sub-region 111b and reflected to the combined light channel C for output, which is also beneficial to reducing the light loss of the first light beam to improve the combined light brightness. In addition, the third projection area substantially overlaps with the fourth projection area, which is also beneficial to reducing the area of ​​the second region 121 and increasing the area of ​​the third region 122, thereby increasing the combined light flux of the second light beam.

[0045] Correspondingly, since the sixth sub-region 122b is located outside the third sub-region 121a, the orthographic projection of the sixth sub-region 122b on the second reference plane 300 does not overlap with the third projection area, thereby ensuring that the part of the second light beam incident on the sixth sub-region 122b is not blocked by the second sub-region 111b and is incident on the sixth sub-region 122b.

[0046] In some embodiments, the areas and / or shapes of the first sub-region 111a, the second sub-region 111b, the third sub-region 121a, and the fourth sub-region 121b may be the same, so as to maximize the combined light flux and thus improve the light output brightness.

[0047] In some embodiments, the first dimming surface 110 may further include: a fourth area 112 surrounding the first area 111. Similar to the second area 121, the fourth area 112 is also a transmission area for the target band light beam. At this time, in the second light input channel L2, the light beam incident on the fifth sub-area 122a can directly hit the fifth sub-area 122a, while the light beam incident on the sixth sub-area 122b needs to first pass through the fourth area 112 before irradiating the sixth sub-area 122b. Figure 4 shows a planar schematic diagram of the first dimming surface and the second dimming surface according to some embodiments of the present disclosure. Figure (a) in Figure 4 is a planar schematic diagram of the first dimming surface 110, and Figure (b) in Figure 4 is a planar schematic diagram of the second dimming surface 120. The circular area in Figure (a) is the first area 111, and the area outside the circular area is the fourth area 112. The circular area in Figure (b) is the second area 121, and the area outside the circular area is the third area 122.

[0048] FIG5 shows a schematic diagram of the structure of a light combining assembly according to some further embodiments of the present disclosure. Considering that it is the first region 111 in the first dimming surface 110 that contributes to light combining, as shown in FIG5 , the first dimming surface 110 may also include only the first region 111, and this embodiment does not impose a limitation on this.

[0049] In some embodiments, to provide the aforementioned first dimming surface 110 and second dimming surface 120, the component body may include at least two dimming elements, with the at least two dimming elements arranged in an overlapping manner. In some embodiments, the overlapping arrangement may be a cross arrangement or a spliced ​​arrangement. The following description primarily uses two structures as examples.

[0050] In one embodiment, the dimming element can be a zoned-coated dichroic mirror. As shown in Figure 1 , the component body can include a first dichroic mirror 11 and a second dichroic mirror 12, arranged crosswise. In this case, the first dimming surface 110 is the surface of the first dichroic mirror 11, and the second dimming surface 120 is the surface of the second dichroic mirror 12.

[0051] In one embodiment, a first base substrate and a second base substrate may be provided. For example, the first base substrate and the second base substrate may be made of suitable materials such as glass or silicon, which is not limited in this embodiment. The first region 111 of the first base substrate and the second region 121 and third region 122 of the second base substrate are predefined as needed.

[0052] Then, the first and second substrates are subjected to zoned coating to obtain a first dichroic mirror 11 and a second dichroic mirror 12. The zoned coating process may include: coating a functional film layer on the upper and / or lower surface of the first region 111 of the first substrate, and coating a functional film layer on the upper and / or lower surface of the third region 122 of the second substrate. In one embodiment, if the target wavelength is the red wavelength, the functional film layer may be a film layer that reflects the red wavelength and transmits blue and / or green wavelengths. In one embodiment, an anti-reflection film that has an anti-reflection effect on red, green, and blue light may also be coated on the second region 121.

[0053] Next, the first dichroic mirror 11 and the second dichroic mirror 12 are cross-assembled together by some assembly method, such as snap-fitting, and the intersection position is located at the first area 111 and the second area 121 to obtain the light combining assembly 10 shown in FIG. 1 .

[0054] In some embodiments, the second region 121 of the second dichroic mirror 12 has an opening, and the first dichroic mirror 11 is disposed within the opening. This ensures the integrity of the first region 111. Compared to the second region 121, which does not contribute to light combination, ensuring the integrity of the first region 111 helps increase the luminous flux of the reflected first light beam, thereby improving the brightness of the combined light.

[0055] In some embodiments, the first and second dichroic mirrors 11 and 12 can have the same size, shape, and region divisions, except that the coating regions are reversed: one has a first region 111 located in the center and is coated with a functional film, while the other has a third region 122 located around the periphery. In this case, the first dimming surface 110 also includes a fourth region 112 surrounding the first region 111.

[0056] In some embodiments, the area of ​​the first dichroic mirror 11 can be smaller than that of the second dichroic mirror 12, or even smaller, such that the first dimming surface 110 only includes the first region 111, as shown in FIG5 . This not only saves material but also minimizes or even avoids damage to the functional film layer in the third region 122 during assembly using a "cross" cross-clamping method, thereby ensuring the integrity of the functional film layer in the third region 122 and reducing unnecessary light loss in the second light beam, thereby improving the brightness of the combined light.

[0057] In other embodiments, the dimming element can be an isosceles right-angle prism with a partitioned coating. The component body can include: four isosceles right-angle prisms, and the right-angled surfaces of the four isosceles right-angle prisms are spliced ​​together. At this time, the first dimming surface 110 and the second dimming surface 120 are formed by splicing the right-angled surfaces of the above-mentioned four isosceles right-angle prisms, and are overlapping splicing surfaces. Of course, in practice, for the light combining component 10 of this structure, attention should be paid to the selection of prism materials and the treatment of the bonding interface to avoid total reflection of the light beam at the bonding interface where the functional film layer is not provided, which affects the brightness of the combined light.

[0058] Figure 6 shows a schematic structural diagram of a light-combining component according to some other embodiments of the present disclosure. As shown in Figure 6, the four isosceles right-angle prisms are respectively a first prism 601, a second prism 602, a third prism 603 and a fourth prism 604. The right-angle surfaces of at least two of the prisms can be zoned and coated so that after the right-angle surfaces of the four prisms are spliced ​​together in sequence by gluing, the above-mentioned first dimming surface 110 and the second dimming surface 120 can be obtained.

[0059] It should be noted that in other embodiments, the component body may also have other applicable structures besides those shown in Figures 1, 5, and 6, and this embodiment is not limited thereto. In other embodiments, the component body may also include four square flat plates, with two adjacent right-angled surfaces of at least two of the square flat plates being zone-coated, and then the four square flat plates being spliced ​​together to obtain the first dimming surface 110 and the second dimming surface 120 described above.

[0060] FIG7 is a schematic diagram illustrating the structure of a light source module according to some embodiments of the present disclosure. Some embodiments of the present disclosure provide a light source module 20. As shown in FIG7 , the light source module 20 may include: a first light source assembly 21, a second light source assembly 22, and a light combining assembly 10 provided in any of the above embodiments. The structure and effects of the light combining assembly 10 can be referred to the relevant description above and will not be repeated here.

[0061] The first light source assembly 21 is used to output a first light beam, and allows the first light beam to be incident from the first light incident channel L1 to the first area 111 of the light combining assembly 10 , and then reflected by the first area 111 to be output to the light combining channel C.

[0062] The second light source assembly 22 is used to output a second light beam, and the second light beam is incident from the second light input channel L2 to the third area 122 of the light combining assembly 10, and is reflected by the third area 122 to be output to the light combining channel C to be combined with the first light beam.

[0063] In some embodiments, the first light source assembly 21 may include a first light source 210 and a first collimating lens group 211. The first light beam provided by the first light source 210 is collimated by the first collimating lens group 211 and then transmitted to the first light input channel L1 of the light combining assembly 10. The second light source assembly 22 is arranged opposite to the light output port of the first light source assembly 21 and may include a second light source 220 and a second collimating lens group 221. The second light beam provided by the second light source 220 is collimated by the second collimating lens group 221 and then transmitted to the second light input channel L2 of the light combining assembly 10.

[0064] In some embodiments, the first light source 210 and the second light source 220 can be a laser light source, a fluorescent light source, or an LED light source. The wavelengths of the first light beam and the second light beam both belong to the target band that the light combining component 10 can reflect. In some embodiments, the wavelength ranges of the first light beam and the second light beam can be the same, or there is partial overlap. In other embodiments, the wavelength ranges of the first light beam and the second light beam can also be separated from each other, but the degree of separation is relatively small, and both belong to the above-mentioned target band.

[0065] In some embodiments, the beam diameter of the first beam is smaller than the beam diameter of the second beam to adapt to the corresponding reflective area of ​​the light combining assembly 10, reduce light loss, and improve the brightness of the combined light. In some embodiments, the energy density of the first beam can be greater than the energy density of the second beam to compensate for the loss of the second beam and improve the brightness of the combined light.

[0066] Thus, the first light source 210 can be a light source with relatively high energy and a relatively small output beam diameter, for example, a laser light source such as a laser diode or a fiber laser, or a fluorescent light source that generates fluorescence under the excitation of a pump laser. The second light source 220 can be a light source with relatively low energy and a relatively small output beam diameter, for example, an LED light source.

[0067] In some embodiments, the area of ​​the first region 111 and the area of ​​the second region 121 in the light combining assembly 10 are both larger than the spot area corresponding to the first light beam, and the difference between the area of ​​the first region 111 and the area of ​​the second region 121 and the spot area is less than or equal to a preset threshold. The preset threshold can be determined based on the actual alignment accuracy and the required combined light brightness, for example, it can be 50% of the spot area. The area of ​​the first region 111 and the second region 121 is slightly larger than the spot area, which is conducive to fully reflecting and transmitting the first light beam and reducing the light loss of the second light beam in the second region 121, thereby improving the combined light brightness.

[0068] In other implementations, the area of ​​the first region 111 and the area of ​​the second region 121 may also be equal to the spot area corresponding to the first light beam, which is not limited in this embodiment.

[0069] FIG8 shows a schematic structural diagram of a light source module according to other embodiments of the present disclosure. As shown in FIG8 , the light source module 20 may further include a focusing lens 24. The focusing lens 24 may be disposed on the optical transmission path between the first light source assembly 21 and the light combining assembly 10, and is configured to converge the first light beam output by the first light source assembly 21 onto the first region 111 of the light combining assembly 10. This can increase the energy density of the first light beam and reduce the spot size of the first light beam irradiated on the first region 111, thereby correspondingly reducing the sizes of the first region 111 and the second region 121. This is beneficial for reducing the light loss of the second light beam while ensuring the reflected luminous flux of the first light beam, thereby improving the brightness of the combined light beam.

[0070] In the case where the light source module 20 is used as the illumination light source of the projection device, the first light beam and the second light beam can be one of the three primary colors, respectively. In some embodiments, the first light beam and the second light beam are both red light beams, and the first area 111 and the third area 122 in the light combining component 10 are both configured to reflect the red light beam and transmit the blue light beam and / or the green light beam. At this time, the light source module 20 may also include: a third light source component 23. The third light source component 23 is used to output a blue light beam and / or a green light beam, and make the blue light beam and / or the green light beam incident on the light combining component 10 from the third light input channel L3 opposite to the light combining channel C, and then transmitted to the light combining channel C through the light combining component 10 to be combined with the first light beam and the second light beam. It should be noted that in the optical paths shown in Figures 7 and 8, the light beam output from the first light source assembly 21 represented by a single dotted line is the first light beam, the light beam output from the second light source assembly 22 represented by a double dotted line is the second light beam, and the light beam output from the third light source assembly 23 represented by a double dotted line is the combined light beam of the blue light beam and the green light beam.

[0071] In some embodiments, the third light source assembly 23 may include a third light source, a fourth light source, a fluorescent generator, and a spectroscopic element capable of transmitting blue light and reflecting green light. The third light source is used to provide a first blue light beam as an illumination light beam, and the fourth light source is used to provide a second blue light beam as a pump light beam. The first blue light beam is transmitted to the third light input channel L3 of the light combining assembly 10 through the spectroscopic element. The fluorescent generator generates a green light beam under the excitation of the second blue light beam, and collimates the green light beam and transmits it to the spectroscopic element, which is reflected by the spectroscopic element and transmitted to the third light input channel L3 of the light combining assembly 10.

[0072] It should be noted that, in addition to the above structure, the third light source assembly 23 may also be implemented using other applicable optical path structures, which is not limited in this embodiment.

[0073] Of course, in other embodiments, the first light beam and the second light beam may also be green light beams. Accordingly, the first area 111 and the third area 122 in the light combining assembly 10 need to be configured to reflect the green light beam and transmit the blue light beam and the red light beam. Alternatively, the first light beam and the second light beam may also be blue light beams. Accordingly, the first area 111 and the third area 122 in the light combining assembly 10 need to be configured to reflect the blue light beam and transmit the green light beam and the red light beam. This embodiment does not impose any restrictions on this.

[0074] Figure 9 shows a schematic diagram of the structure of a projection device according to some embodiments of the present disclosure. Some embodiments of the present disclosure provide a projection device. As shown in Figure 9, the projection device 1 may include a light source module 20, a light valve 30, and a projection lens 40. The structure of the light source module 20 can be referred to in the relevant description above and will not be repeated here.

[0075] The red, green, and blue (RGB) primary color illumination beams output by the light source module 20 are processed by the light valve 30 and then projected onto the screen through the projection lens 40 to display a color image. For example, the light valve 30 can be an LCD (Liquid Crystal Display), a DMD (Digital Micromirror Device), or an LCOS (Liquid Crystal on Silicon) light valve, although this embodiment does not limit this.

[0076] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure is limited to these examples. Based on the concept of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present disclosure as described above, which are not provided in detail for the sake of simplicity.

[0077] Although the exemplary embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the exemplary embodiments and all changes and modifications that fall within the scope of the present disclosure.

[0078] In a first aspect of the present disclosure, a light-combining component is provided, comprising: a component body, the component body having a first dimming surface and a second dimming surface, the first dimming surface comprising: a first area, the second dimming surface comprising: a second area and a third area surrounding the second area, wherein: the first area and the third area are reflection areas of the same target band light beam, and the second area is a transmission area of ​​the target band light beam; the first area and the second area are arranged to overlap to divide a light-combining channel, a first light input channel and a second light input channel opposite to the first light input channel; a first light beam incident from the first light input channel to the first area is reflected by the first area and transmitted to the light-combining channel; a second light beam incident from the second light input channel to the third area is reflected by the third area and transmitted to the light-combining channel.

[0079] In combination with the first aspect, in some embodiments, the component body includes at least two dimming elements, and the at least two dimming elements are arranged in an overlapping manner, and the overlapping arrangement includes: a mutually crossed or spliced ​​arrangement.

[0080] In combination with the first aspect, in some embodiments, at least two dimming elements include: a first dichroic mirror and a second dichroic mirror, the first dichroic mirror and the second dichroic mirror are arranged crosswise, the first dimming surface is the surface of the first dichroic mirror, and the second dimming surface is the surface of the second dichroic mirror.

[0081] In combination with the first aspect, in some embodiments, the second region of the second dichroic mirror has an opening, the first dichroic mirror is disposed in the opening, and the first region overlaps the second region.

[0082] In combination with the first aspect, in some embodiments, the at least two dimming elements include: four isosceles right-angle prisms, and the right-angle surfaces of the four isosceles right-angle prisms are spliced ​​together so that the first dimming surface and the second dimming surface are two overlapping spliced ​​surfaces.

[0083] In combination with the first aspect, in some embodiments, the first region is perpendicular to the second region and the third region.

[0084] In combination with the first aspect, in some embodiments, the first area includes a first sub-area and a second sub-area respectively located on both sides of the second dimming surface, the second area includes a third sub-area and a fourth sub-area respectively located on both sides of the first dimming surface, and the third area includes a fifth sub-area and a sixth sub-area respectively located on both sides of the first dimming surface; a part of the first light beam incident from the first light input channel is incident on the first sub-area, and after being reflected by the first sub-area, it passes through the third sub-area to enter the combined light channel output, and the other part passes through the third sub-area to enter the second sub-area, and then is reflected by the second sub-area to the combined light channel output; a part of the second light beam incident from the second light input channel is reflected by the fifth sub-area to the combined light channel output, and a part is reflected by the sixth sub-area to the combined light channel output.

[0085] In combination with the first aspect, in some embodiments, the orthographic projection of the first sub-area on the first reference plane is the first projection area; the orthographic projection of the third sub-area on the first reference plane is the second projection area; the first reference plane is a plane perpendicular to the optical axis of the combined light channel; and the first projection area is located within the second projection area, or basically coincides with the second projection area.

[0086] In combination with the first aspect, in some embodiments, the orthographic projection of the fifth sub-region on the first reference plane does not overlap with the orthographic projection of the second sub-region on the first reference plane.

[0087] In combination with the first aspect, in some embodiments, the orthographic projection of the second sub-area on the second reference plane is the third projection area; the orthographic projection of the third sub-area on the second reference plane is the fourth projection area; the second reference plane is a plane perpendicular to the optical axis of the first light input channel; the third projection area is located within the fourth projection area, or basically coincides with the fourth projection area.

[0088] In combination with the first aspect, in some embodiments, the first sub-region, the second sub-region, the third sub-region, and the fourth sub-region have the same area and / or shape.

[0089] In combination with the first aspect, in some embodiments, the first dimming surface further includes: a fourth area surrounding the first area, and the fourth area is a transmission area for the light beam in the target wavelength band.

[0090] In combination with the first aspect, in some embodiments, the target wavelength band is a red light band, and the first dimming surface and the second dimming surface are further configured to transmit light beams in the blue light band and / or the green light band.

[0091] In the second aspect of the present disclosure, a light source module is provided, comprising: a first light source assembly, a second light source assembly and the light combining assembly provided in the previous embodiment, wherein: the first light source assembly is used to output a first light beam, and allows the first light beam to be incident from the first light input channel to the first area of ​​the light combining assembly, and reflected from the first area to the light combining channel for output; the second light source assembly is used to output a second light beam, and allows the second light beam to be incident from the second light input channel to the third area of ​​the light combining assembly, and reflected from the third area to the light combining channel for output.

[0092] In combination with the second aspect, in some embodiments, the first light beam and the second light beam are both red light beams, the first area and the third area are configured to reflect the red light beam and transmit the blue light beam and / or the green light beam, and the light source module also includes: a third light source component, which is used to output the blue light beam and / or the green light beam, and make the blue light beam and the green light beam be incident on the light combining component from the third light input channel opposite to the light combining channel, and then be transmitted to the light combining channel through the light combining component.

[0093] In combination with the second aspect, in some embodiments, the beam diameter of the first light beam is smaller than the beam diameter of the second light beam, and the energy density of the first light beam is greater than the energy density of the second light beam.

[0094] In combination with the second aspect, in some embodiments, the first light source assembly includes a laser light source, and the second light source assembly includes: an LED light source.

[0095] In conjunction with the second aspect, in some embodiments, the wavelength range of the first light beam and the second light beam is the same, or there is a partial overlap.

[0096] In combination with the second aspect, in some embodiments, the area of ​​the first region and the area of ​​the second region in the light combining component are both larger than the light spot area corresponding to the first light beam, and the difference between the light spot area and the light spot area is less than or equal to a preset threshold; or, the area of ​​the first region and the area of ​​the second region in the light combining component are both equal to the light spot area corresponding to the first light beam.

[0097] In combination with the second aspect, in some embodiments, the light source module further includes: a focusing lens, which is arranged on the light transmission path between the first light source assembly and the light combining assembly, and the focusing lens is used to converge the first light beam output by the first light source assembly to the first area of ​​the light combining assembly.

[0098] In a third aspect of the present disclosure, a projection device is provided, comprising: a light valve, a projection lens, and the light source module provided in the second aspect of the present disclosure, wherein the illumination light beam output by the light source module passes through the light valve and the projection lens and is then output.

Claims

1. A light combining component, comprising: A component body having a first dimming surface (110) and a second dimming surface (120), the first dimming surface (110) comprising: a first region (111), and the second dimming surface (120) comprising: a second region (121) and a third region (122) surrounding the second region (121), wherein: The first region (111) and the third region (122) are reflection regions for light beams of the same target wavelength band, and the second region (121) is a transmission region for the light beams of the target wavelength band; The first region (111) and the second region (121) are overlapped to define a light combining channel, a first light incident channel, and a second light incident channel opposite to the first light incident channel; A first light beam incident on the first region (111) from the first light incident channel is reflected by the first region (111) and then transmitted to the light combining channel; a second light beam incident on the third region (122) from the second light incident channel is reflected by the third region (122) and then transmitted to the light combining channel.

2. The optical combining component according to claim 1, wherein, The component body includes at least two dimming elements, and the at least two dimming elements are overlapped, and the overlapping includes: being cross - arranged or spliced.

3. The light combining component according to claim 2, wherein, The at least two dimming elements include: a first dichroic mirror (11) and a second dichroic mirror (12), the first dichroic mirror (11) and the second dichroic mirror (12) are cross - arranged, the first dimming surface (110) is the surface of the first dichroic mirror (11), and the second dimming surface (120) is the surface of the second dichroic mirror (12).

4. The optical combining component according to claim 3, wherein, The second region (121) of the second dichroic mirror (12) has an opening, and the first dichroic mirror (11) is inserted into the opening so that the first region (111) and the second region (121) overlap.

5. The light combining component according to claim 2, wherein, The at least two dimming elements include: four isosceles right - angled prisms, and the right - angled surfaces of the four isosceles right - angled prisms are spliced together so that the first dimming surface (110) and the second dimming surface (120) are overlapping splicing surfaces.

6. The optical combining component according to claim 1, wherein, The first region (111) is perpendicular to the second region (121) and the third region (122).

7. The optical combining component according to claim 1, wherein The first region (111) includes a first sub - region (111a) and a second sub - region (111b) respectively located on both sides of the second dimming surface (120), the second region (121) includes a third sub - region (121a) and a fourth sub - region (121b) respectively located on both sides of the first dimming surface (110), and the third region (122) includes a fifth sub - region (122a) and a sixth sub - region (122b) respectively located on both sides of the first dimming surface (110); A part of the first light beam incident from the first light input channel is incident on the first sub-region (111a), reflected by the first sub-region (111a), and then enters the light combining channel through the third sub-region (121a) for output. Another part is incident on the second sub-region (111b) through the third sub-region (121a), and then reflected by the second sub-region (111b) to the light combining channel for output; A part of the second light beam incident from the second light input channel is reflected to the light combining channel through the fifth sub-region (122a), and a part is reflected to the light combining channel through the sixth sub-region (122b).

8. The optical combining component according to claim 7, wherein, The orthographic projection of the first sub-region (111a) on the first reference plane (200) is the first projection region; the orthographic projection of the third sub-region (121a) on the first reference plane (200) is the second projection region; the first reference plane (200) is a plane perpendicular to the optical axis of the light combining channel; and the first projection region is located within the second projection region, or substantially coincides with the second projection region.

9. The optical combining component according to claim 8, wherein, The orthographic projection of the fifth sub-region (122a) on the first reference plane (200) does not overlap with the orthographic projection of the second sub-region (111b) on the first reference plane (200).

10. The optical combining component according to claim 7, wherein, The orthographic projection of the second sub-region (111b) on the second reference plane (300) is the third projection region; the orthographic projection of the third sub-region (121a) on the second reference plane (300) is the fourth projection region; the second reference plane (300) is a plane perpendicular to the optical axis of the first light input channel; and the third projection region is located within the fourth projection region, or substantially coincides with the fourth projection region.

11. The optical combining component according to claim 7, wherein, The areas and / or shapes of the first sub-region (111a), the second sub-region (111b), the third sub-region (121a) and the fourth sub-region (121b) are the same.

12. The light combining component according to claim 1, wherein, The first light modulating surface (110) further includes: a fourth region (112) surrounding the first region (111), and the fourth region (112) is a transmission region for the light beam of the target wavelength band.

13. The optical combining component according to claim 1, wherein, The target wavelength band is the red wavelength band, and the first light modulating surface (110) and the second light modulating surface (120) are further configured to: transmit the light beam of the blue and / or green wavelength bands.

14. A light source module, comprising: A first light source assembly (21), a second light source assembly (22) and the light combining assembly (10) according to any one of claims 1-13, wherein: The first light source assembly (21) is configured to output a first light beam, and make the first light beam incident from the first light input channel on the first region (111) of the light combining assembly (10), and be reflected by the first region (111) to the light combining channel for output; The second light source assembly (22) is configured to output a second light beam, and make the second light beam incident from the second light input channel on the third region (122) of the light combining assembly (10), and be reflected by the third region (122) to the light combining channel for output.

15. The light source module according to claim 14, wherein, Both the first light beam and the second light beam belong to red light beams. The first region (111) and the third region (122) are configured to reflect red light beams and transmit blue light beams and / or green light beams. The light source module further includes: A third light source assembly (23) for outputting blue light beams and / or green light beams, and causing the blue light beams and green light beams to enter the light combining assembly (10) from a third light incident channel opposite to the light combining channel, and then transmit through the light combining assembly (10) to the light combining channel.

16. The light source module according to claim 14, wherein, The beam diameter of the first light beam is smaller than that of the second light beam, and the energy density of the first light beam is greater than that of the second light beam.

17. The light source module according to claim 16, wherein, The first light source assembly (21) includes a laser light source, and the second light source assembly (22) includes: an LED light source.

18. The light source module according to claim 14, wherein, The wavelength ranges of the first light beam and the second light beam are the same, or there is partial overlap.

19. The light source module according to claim 14, wherein, The area of the first region (111) and the area of the second region (121) in the light combining assembly (10) are both larger than the spot area corresponding to the first light beam, and the differences from the spot area are both less than or equal to a preset threshold; or The area of the first region (111) and the area of the second region (121) in the light combining assembly (10) are both equal to the spot area corresponding to the first light beam.

20. The light source module according to claim 14 further comprises: A focusing lens (24), the focusing lens (24) is disposed on the light transmission path between the first light source assembly (21) and the light combining assembly (10), and the focusing lens (24) is used to converge the first light beam output by the first light source assembly (21) to the first region (111) of the light combining assembly (10).

21. A projection device, comprising: The light source module according to any one of claims 14-20; A light valve; And A projection lens; Wherein, the illumination light beam output by the light source module is output after passing through the light valve and the projection lens.

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