Optical system and projector

Abstract

The invention discloses an optical system and a projector, and relates to the technical field of optics, the optical system comprises a beam combining module and three monochromatic source modules emitting light towards the beam combining module, and the three monochromatic source modules are respectively a first light source module, a second light source module and a third light source module; a three-dimensional rectangular coordinate system is established by taking the light-emitting surface of the first light source module as an xoy plane, the light-emitting surface of the second light source module is parallel to or forms an acute angle with the xoz plane of the three-dimensional rectangular coordinate system, and the light-emitting surface of the third light source module is parallel to or forms an acute angle with the yoz plane of the three-dimensional rectangular coordinate system. The beam combining module is used for converting the light ray propagation directions of the three monochromatic source modules, so that the light rays of the three monochromatic source modules are parallelly combined and emitted in the beam combining module. According to the technical scheme, the requirement of the light source for the space size in all directions is lowered.

Description

Technical Field

[0001] The present invention relates to the field of optical technology, and in particular to an optical system and a projector. Background Art

[0002] In the existing LCoS optical system, the light-emitting surfaces of the R / G / B three-color light sources need to be arranged coplanarly or in parallel. This way of arranging light sources has high requirements on the size of the space in a certain direction and is prone to interference with surrounding components. Summary of the invention

[0003] The main purpose of the present invention is to provide an optical system and a projector, aiming to reduce the space requirements of the light source in all directions.

[0004] To achieve the above object, the optical system proposed in the present invention includes a beam combining module and three monochromatic light source modules emitting light toward the beam combining module, wherein the three monochromatic light source modules are respectively a first light source module, a second light source module and a third light source module;

[0005] A three-dimensional rectangular coordinate system is established with the light-emitting surface of the first light source module as the xoy plane, the light-emitting surface of the second light source module is parallel to or forms an acute angle with the xoz plane of the three-dimensional rectangular coordinate system, and the light-emitting surface of the third light source module is parallel to or forms an acute angle with the yoz plane of the three-dimensional rectangular coordinate system;

[0006] The beam combining module is used to convert the light propagation directions of the three monochromatic light source modules so that the light of the three monochromatic light source modules is combined and emitted in parallel in the beam combining module.

[0007] In one embodiment, the beam combining module is configured to transmit light from one of the monochromatic light source modules and reflect light from the other two monochromatic light source modules, so that light from the three monochromatic light source modules is emitted from the beam combining module in parallel.

[0008] In one embodiment, the beam combining module includes a first optical filter and a second optical filter intersecting each other, a first optical film and a second optical film are formed on two surfaces of the first optical filter respectively, and a third optical film and a fourth optical film are formed on two surfaces of the second optical filter respectively;

[0009] The first optical film is arranged relative to the optical path of the first light source module and is configured to reflect the incident light corresponding to the first light source module; the second optical film is arranged relative to the optical path of the second light source module, and both surfaces of the first filter avoid the outgoing optical path of the third light source module;

[0010] The third optical film is arranged relative to the optical path of the third light source module and is configured to reflect the incident light corresponding to the third light source module. The fourth optical film is arranged relative to the optical path of the second light source module, and both surfaces of the second filter avoid the outgoing optical path of the first light source module.

[0011] Furthermore, the first filter is configured to transmit incident light corresponding to the second light source module and the third light source module, and the second filter is configured to transmit incident light corresponding to the first light source module and the second light source module.

[0012] In one embodiment, the first optical film is configured to highly reflect incident light corresponding to the first light source module, and the first optical film and the second optical film are both configured to highly transmit incident light corresponding to the second light source module and the third light source module;

[0013] The third optical film is configured to highly reflect incident light corresponding to the third light source module, and the third optical film and the fourth optical film are configured to highly transmit incident light corresponding to the first light source module and the second light source module.

[0014] In one embodiment, the first light source module is a red light source module, the second light source module is a green light source module, the third light source module is a blue light source module, the first optical film has high reflectivity for red light, high transmittance for green light, and high transmittance for blue light, the second optical film has high transmittance for green light and high transmittance for blue light, the third optical film has high reflectivity for blue light, high transmittance for red light, and high transmittance for green light, and the fourth optical film has high transmittance for red light and high transmittance for green light.

[0015] In one embodiment, the angle between the first filter and the yoz plane of the three-dimensional rectangular coordinate system is 80 degrees to 90 degrees.

[0016] In one embodiment, the angle between the first filter and the xoy plane of the three-dimensional rectangular coordinate system is 40 degrees to 50 degrees.

[0017] In one embodiment, the included angle between the second filter and the xoy plane of the three-dimensional rectangular coordinate system is 80 degrees to 90 degrees.

[0018] In one embodiment, the included angle between the second filter and the yoz plane of the three-dimensional rectangular coordinate system is 40 degrees to 50 degrees.

[0019] In one embodiment, the angle between the first filter and the yoz plane of the three-dimensional rectangular coordinate system is 90 degrees, and the angle between the first filter and the xoy plane of the three-dimensional rectangular coordinate system is 45 degrees.

[0020] In one embodiment, the beam combining module is configured to refract the light of the monochromatic light source modules so that the light of three monochromatic light source modules are emitted from the beam combining module in parallel.

[0021] In one embodiment, the beam combining module is configured as at least one deflection prism, and one beam combining module is configured corresponding to one monochromatic light source module.

[0022] In one embodiment, the beam combining module includes a plurality of columns of deflection prisms, and the incident surfaces of the plurality of columns of deflection prisms are sequentially connected along a direction parallel to the light emitting surfaces of the corresponding monochromatic light source modules.

[0023] In one embodiment, the incident surface of the deflection prism is parallel to the light emitting surface of the corresponding monochromatic light source module, and the deflection angles of the deflection prisms corresponding to any two monochromatic light source modules are equal.

[0024] In one embodiment, the optical system further comprises a reflector and an optical chip, wherein the reflector and the optical chip are located downstream of the optical path of the beam combining module, and one of the reflector and the optical chip is configured to reflect light toward the other.

[0025] In one embodiment, a central normal of the reflector and a central normal of the optical chip are coplanar, and a plane where the central normals of the two lie is parallel to any one of the xoy plane, the xoz plane, and the yoz plane of the three-dimensional rectangular coordinate system.

[0026] The present invention also provides a projector, which includes the aforementioned optical system.

[0027] In the technical solution of the present invention, the three monochromatic light source modules are roughly distributed vertically in pairs, so that any two monochromatic light source modules are not coplanar or parallel, which can avoid the three monochromatic light source modules from occupying too much space in a certain direction. The three monochromatic light source modules occupy relatively small space in the three schemes of the x direction, y direction and z direction of the three-dimensional rectangular coordinate system, and are not easy to interfere with surrounding components, which is conducive to the miniaturization design of the optical system. In addition, the three monochromatic light source modules emit light toward the beam combining module, which can receive the light of the monochromatic light source modules and convert the propagation direction of the light of the three monochromatic light source modules, so that after the light of the three monochromatic light source modules passes through the beam combining module, the three non-coplanar light rays of the three monochromatic light source modules can be parallel and combined into one beam, so that the optical system can finally project a high-quality image. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 A schematic structural diagram of an optical system according to an embodiment of the present invention;

[0030] Figure 2 A schematic structural diagram of a monochromatic light source module and a beam combining module of another embodiment of an optical system provided by the present invention;

[0031] Figure 3 Schematic diagrams of two structures of the monochromatic light source module of the optical system provided by the present invention;

[0032] Figure 4 A schematic structural diagram of an embodiment of a light homogenization module of an optical system provided by the present invention.

[0033] Description of Figure Numbers:

[0034] 100, monochromatic light source module; 101, first light source module; 102, second light source module; 103, third light source module;

[0035] 110. light source component; 120. collimating component;

[0036] 200, beam combining module;

[0037] 211, a first optical filter; 2111, a first optical film; 2112, a second optical film; 212, a second optical filter; 2121, a third optical film; 2122, a fourth optical film;

[0038] 220, deflection prism;

[0039] 300. light homogenizing module; 400. reflector; 500. optical chip.

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] The present invention provides an optical system.

[0045] See also Figure 1 In one embodiment of the present invention, the optical system includes a beam combining module 200 and three monochromatic light source modules 100 emitting light toward the beam combining module 200, wherein the three monochromatic light source modules 100 are respectively a first light source module 101, a second light source module 102 and a third light source module 103;

[0046] A three-dimensional rectangular coordinate system is established with the light-emitting surface of the first light source module 101 as the xoy plane, the light-emitting surface of the second light source module 102 is parallel to or forms an acute angle with the xoz plane of the three-dimensional rectangular coordinate system, and the light-emitting surface of the third light source module 103 is parallel to or forms an acute angle with the yoz plane of the three-dimensional rectangular coordinate system;

[0047] The beam combining module is used to convert the light propagation directions of the three monochromatic light source modules so that the light of the three monochromatic light source modules is combined and emitted in parallel in the beam combining module.

[0048] In the technical solution of the present invention, the three monochromatic light source modules 100 are roughly distributed vertically in pairs, so that any two monochromatic light source modules 100 are not coplanar or parallel, which can avoid the three monochromatic light source modules 100 occupying too much space in a certain direction. The three monochromatic light source modules 100 occupy relatively small space in the three schemes of the x direction, y direction and z direction of the three-dimensional rectangular coordinate system, and are not easy to interfere with surrounding components, which is conducive to the miniaturization design of the optical system. In addition, the three monochromatic light source modules 100 emit light toward the beam combining module 200, and the beam combining module 200 can receive the light of the monochromatic light source modules 100 and convert the propagation direction of the light of the three monochromatic light source modules 100, so that after the light of the three monochromatic light source modules 100 passes through the beam combining module 200, the three non-coplanar light rays of the three monochromatic light source modules 100 can be parallel and combined into one beam, so that the optical system can finally project a high-quality image.

[0049] The smaller the angle between each monochromatic light source module 100 and the plane corresponding to the three-dimensional rectangular coordinate system, the more convenient it is to arrange the beam combining module 200, that is, it is preferable that each monochromatic light source module 100 and the plane corresponding to the three-dimensional rectangular coordinate system are parallel. It should be noted that parallel means parallel or approximately parallel, that is, within the allowable error range of the system, parallel can be equivalent to parallel.

[0050] In one embodiment, the beam combining module 200 is configured to transmit the light of one of the monochromatic light source modules 100 and reflect the light of the other two monochromatic light source modules 100, so that the light of the three monochromatic light source modules 100 is emitted in parallel from the beam combining module 200. For the convenience of the following description, it is taken as an example that the beam combining module 200 transmits the light of the second light source module 102 and reflects the light of the first light source module 101 and the third light source module 103, and it should be noted that in this embodiment, the refractive index of the optical device of the beam combining module 200 is very small or does not refract the light. After the light of the second light source module 102 is transmitted by the beam combining module 200, it can continue to propagate in the original direction, and the reflection of the light of the first light source module 101 and the third light source module 103 by the beam combining module 200 will make the corresponding emitted light of the two parallel with the light of the second light source module 102, and finally make the emitted light of the three monochromatic light source modules 100 in the beam combining module 200 parallel.

[0051] Further, in this embodiment, the beam combining module 200 includes a first filter 211 and a second filter 212 intersecting each other, the first filter 211 is formed with a first optical film 2111 and a second optical film 2112 on both surfaces, and the second filter 212 is formed with a third optical film 2121 and a fourth optical film 2122 on both surfaces;

[0052] The first optical film 2111 is arranged relative to the optical path of the first light source module 101 and is configured to reflect the incident light corresponding to the first light source module 101. The second optical film 2112 is arranged relative to the optical path of the second light source module 102, and both surfaces of the first filter 211 avoid the outgoing light path of the third light source module 103.

[0053] The third optical film 2121 is arranged relative to the optical path of the third light source module 103, and is configured to reflect the incident light corresponding to the third light source module 103. The fourth optical film 2122 is arranged relative to the optical path of the second light source module 102, and both surfaces of the second filter 212 avoid the outgoing light path of the first light source module 101.

[0054] Furthermore, the first filter 211 is configured to transmit incident light corresponding to the second light source module 102 and the third light source module 103 , and the second filter 212 is configured to transmit incident light corresponding to the first light source module 101 and the second light source module 102 .

[0055] Specifically, since the first filter 211 and the second filter 212 are cross-arranged, the first filter 211 has a portion closer to the second light source module 102 relative to the second filter 212, and also has a portion farther away from the second light source module 102 relative to the second filter 212, and the two portions are bounded by the intersection of the first filter 211 and the second filter 212. With the second light source module 102 as a reference, the portion closer to the second light source module 102 is called the front portion, the portion farther away from the second light source module 102 is called the rear portion, the side facing the second light source module 102 is called the front side, and the side facing away from the second light source module 102 is called the rear side. Among them, the front portion of the first filter 211 and the rear portion of the second filter 212 are arranged opposite to each other in the light emitting direction of the second light source module 102, and the front portion of the second filter 212 and the rear portion of the first filter 211 are arranged opposite to each other in the light emitting direction of the second light source module 102.

[0056] For the first filter 211, the first filter 211 is tilted relative to the light-emitting surface of the first light source module 101 and the light-emitting surface of the second light source module 102, so that the side of the first filter 211 on which the first optical film 2111 is set faces the light-emitting surface of the first light source module 101, and this side is also the back side of the first filter 211, and the side of the first filter 211 on which the second optical film 2112 is set faces the light-emitting surface of the second light source module 102, and this side is also the front side of the second filter 212, and both the front and back surfaces of the first filter 211 avoid the outgoing light path of the third light source module 103, so that the light of the third light source module 103 will not be directly projected onto the surface of the first filter 211.

[0057] For the second filter 212, the second filter 212 is tilted relative to the light-emitting surface of the second light source module 102 and the light-emitting surface of the third light source module 103, so that the side of the second filter 212 on which the third optical film 2121 is set faces the light-emitting surface of the third light source module 103, and this side is also the back side of the second filter 212, and the side of the second filter 212 on which the fourth optical film 2122 is set faces the light-emitting surface of the second light source module 102, and this side is also the front side of the second filter 212, and both the front side and the back side of the second filter 212 avoid the outgoing light path of the first light source module 101, so that the light of the first light source module 101 will not be directly projected onto the surface of the first filter 211.

[0058] For the first light source module 101, its outgoing light can be directly projected onto the back side of the first filter 211, that is, onto the first optical film 2111, and reflected, wherein part of the light will pass through the second filter 212 after being reflected by the first optical film 2111, and will be transmitted through the second filter 212. Specifically, part of the light will be projected onto the front part of the first filter 211, and this part of the light after being reflected will be projected onto the rear part of the second filter 212, and will be transmitted; the other part will be projected onto the rear part of the first filter 211, and will be directly emitted from the back side of the first filter 211. These two parts of light constitute the light emitted by the first light source module 101 after passing through the beam combining module 200.

[0059] For the second light source module 102, its emitted light is respectively projected to the part in front of the first filter 211 and the part in front of the second filter 212. The light transmitted through the part in front of the first filter 211 will continue to be projected to the part behind the second filter 212 and projected. The light transmitted through the part in front of the second filter 212 will continue to be projected to the part behind the first filter and projected, thereby finally forming the light emitted from the beam combining module 200.

[0060] For the third light source module 103, its outgoing light can be directly projected onto the back side of the second filter 212, that is, onto the third optical film 2121, and reflected, wherein part of the light will pass through the first filter 211 after being reflected by the third optical film 2121, and be transmitted through the first filter 211. Specifically, part of the light will be projected onto the front part of the second filter 212, and this part of the light after being reflected will be projected onto the rear part of the first filter 211, and be transmitted; the other part will be projected onto the rear part of the second filter 212, and will be directly emitted from the back side of the second filter 212. These two parts of light constitute the light emitted by the third light source module 103 after passing through the beam combining module 200.

[0061] It can be understood that the light emitted from the three monochromatic light source modules after passing through the beam combining module 200 can be combined into one beam, and the light of each color can be mixed, that is, white light can be formed. In addition, when the above-mentioned related light is transmitted through the beam combining module 200, it is incident from the front side and emitted from the back side. Without loss of generality, the related light is not refracted when it is transmitted, or the refraction amount is relatively small, so that the direction of the light path is almost not deflected. This is conducive to simplifying the design of the optical elements of the monochromatic light source module 100 and the beam combining module 200. Of course, in other embodiments, the light may also be refracted when it is transmitted through the beam combining module 200. By designing the refractive index of the filter, the light emitting direction of the monochromatic light source module 100, etc., it is ensured that the light path propagates along the target direction.

[0062] Furthermore, in the present embodiment, the first optical film 2111 is configured to highly reflect the incident light corresponding to the first light source module 101, and the first optical film 2111 and the second optical film 2112 are both configured to highly transmit the incident light corresponding to the second light source module 102 and the third light source module 103; the third optical film 2121 is configured to highly reflect the incident light corresponding to the third light source module 103, and the third optical film 2121 and the fourth optical film 2122 are configured to highly transmit the incident light corresponding to the first light source module 101 and the second light source module 102.

[0063] It should be noted that when a certain light is highly reflected on the surface of a certain optical film, the reflectivity of the optical film to the light is at least 85%, preferably 90%, and when a certain light is highly transmitted through a certain optical film, the transmittance of the optical film to the light is at least 90%, preferably 95%. In this way, the loss rate of light energy can be reduced, which is conducive to ensuring the light energy conversion rate of the optical system.

[0064] Specifically, the first light source module 101 is a red light source module, the second light source module 102 is a green light source module, the third light source module 103 is a blue light source module, the first optical film 2111 has high reflectivity for red light, high transmittance for green light and high transmittance for blue light, the second optical film 2112 has high transmittance for green light and high transmittance for blue light, the third optical film 2121 has high reflectivity for blue light, high transmittance for red light and high transmittance for green light, and the fourth optical film 2122 has high transmittance for red light and high transmittance for green light.

[0065] In this way, the red light emitted by the first light source module 101 can be highly reflected on the surface of the first optical film 2111, and can be highly transmitted at the third optical film 2121 and the fourth optical film 2122, that is, part of the red light emitted by the first light source module 101 can pass through the second filter 212 with high transmission after being highly reflected on the surface of the first optical film 2111; the green light emitted by the second light source module 102 can be highly transmitted at the first optical film 2111 to the fourth optical film 2122, that is, can pass through the first filter 211 and the second filter 212 with high transmission; the blue light emitted by the third light source module 103 can be highly reflected on the surface of the third optical film 2121, and can be highly transmitted at the first optical film 2111 and the second optical film 2112, that is, part of the blue light emitted by the third light source module 103 can pass through the first filter 211 with high transmission after being highly emitted on the surface of the third optical film 2121.

[0066] Of course, in other embodiments, the color lights of the three monochromatic light source modules 100 may also be other arrangements and combinations, for example, the first light source module 101 is blue, the second light source module 102 is red, and the third light source module 103 is green, and the transmission and reflection characteristics of each optical film to the color lights are adaptively adjusted.

[0067] Further, in the present embodiment, the angle between the first filter 211 and the yoz plane of the three-dimensional rectangular coordinate system is 80 to 90 degrees. The angle is greater than or equal to 80 degrees and less than or equal to 90 degrees, preferably 90 degrees, that is, the first filter 211 is perpendicular or substantially perpendicular to the yoz plane of the three-dimensional rectangular coordinate system, so that the light emitting direction of the third light source module 103 is adjusted to be parallel to the first filter 211, so that the first filter 211 can avoid the emitting light path of the third light source module 103, which is conducive to reducing the design difficulty of the optical system and simplifying the component selection design of the optical system.

[0068] Furthermore, in the present embodiment, the angle between the first filter 211 and the xoy plane of the three-dimensional rectangular coordinate system is 40 to 50 degrees. The angle is greater than or equal to 40 degrees and less than or equal to 50 degrees, preferably 45 degrees, that is, the first filter 211 is located on the symmetry plane of the xoy plane and the xoz plane, or parallel to or approximately parallel to the symmetry plane. In this way, when the light-emitting surface of the second light source module 102 is parallel to the xoz plane of the three-dimensional rectangular coordinate system, it is possible to conveniently combine the reflected light of the first light source module 101 in the first filter 211 and the light after transmission of the second light source module 102, which is conducive to reducing the design difficulty of the optical system and simplifying the component selection design of the optical system.

[0069] Further, in the present embodiment, the angle between the second optical filter 212 and the xoy plane of the three-dimensional rectangular coordinate system is 80 to 90 degrees. The angle is greater than or equal to 80 degrees and less than or equal to 90 degrees, preferably 90 degrees, that is, the second optical filter 212 is perpendicular or substantially perpendicular to the xoy plane of the three-dimensional rectangular coordinate system, so that the light emitting direction of the first light source module 101 is adjusted to be parallel to the second optical filter 212, so that the second optical filter 212 can avoid the emitting light path of the first light source module 101, which is conducive to reducing the design difficulty of the optical system and simplifying the component selection design of the optical system.

[0070] Furthermore, in the present embodiment, the angle between the second filter 212 and the yoz plane of the three-dimensional rectangular coordinate system is 40 to 50 degrees. The angle is greater than or equal to 40 degrees and less than or equal to 50 degrees, preferably 45 degrees, that is, the first filter 211 is located on the symmetry plane between the yoz plane and the xoz plane, or parallel to or approximately parallel to the symmetry plane. In this way, when the light-emitting surface of the second light source module 102 is parallel to the xoz plane of the three-dimensional rectangular coordinate system, the reflected light of the first light source module 101 in the first filter 211 and the light after transmission of the second light source module 102 can be conveniently combined, which is conducive to reducing the design difficulty of the optical system and simplifying the component selection design of the optical system.

[0071] In one embodiment, the beam combining module 200 is configured to refract the light of the monochromatic light source module 100, so that the light of the three monochromatic light source modules 100 is emitted in parallel from the beam combining module 200. In this way, the embodiment can refract the light of the monochromatic light source module 100 through the beam combining module 200, change the propagation direction of the light of the three monochromatic light source modules 100, so that the light of the three monochromatic light source modules 100 after being refracted by the beam combining module 200 can be emitted in parallel, that is, the light of the three monochromatic light source modules 100 can be gathered for easy beam combining.

[0072] Further, in this embodiment, please refer to Figure 2 The beam combining module 200 is configured as at least one deflection prism 220, and one beam combining module 200 is configured for each monochromatic light source module 100. The arrangement angle of the deflection prism 220 is flexible, and the deflection angle of the deflection prism 220 to the light is large, which can meet the requirement of refracting the light of the monochromatic light source module 100 to deflect the light at a suitable angle. The beam combining module 200 and the monochromatic light source module 100 are arranged in a one-to-one correspondence, so that each beam combining module 200 only meets the requirement of the deflection angle required by the light of the corresponding monochromatic light source module 100, which is conducive to simplifying the component design of the beam combining module 200.

[0073] Of course, in other embodiments, other lenses or lens groups may be used to correspond to the monochromatic light source module 100 to refract its light, or, by different position zones of the same optical element being designed in a differentiated manner, it may be possible to collimate the light from three monochromatic light source modules 100 at the same time.

[0074] Further, in this embodiment, the beam combining module 200 includes a plurality of columns of deflection prisms 220, and the incident surfaces of the plurality of columns of the deflection prisms 220 are sequentially connected in a direction parallel to the light-emitting surface of the corresponding monochromatic light source module 100. In order to meet the requirements of the deflection angle required for the light of the corresponding monochromatic light source module 100, the deflection prism 220 needs to have a suitable bottom angle, that is, the angle between the incident surface and the exit surface needs to be within a suitable range. By setting a plurality of columns of deflection prisms 220, the height of the deflection prism 220 relative to the light-emitting surface of the corresponding monochromatic light source module 100 can be reduced under the premise of ensuring the coverage of the light-emitting surface of the corresponding monochromatic light source module 100, which is conducive to reducing the volume of the optical system and facilitating the miniaturization design of the optical system. Among them, the number of columns of the deflection prisms 220 is preferably greater than or equal to 4, and the number of columns of the deflection prisms 220 can be 10 columns, 16 columns, 20 columns or 32 columns, etc. Of course, in other embodiments, if the requirements of the optical system can be met, the deflection prism 220 can also be set in only one column.

[0075] Furthermore, in the present embodiment, the incident surface of the deflection prism 220 is parallel to the light emitting surface of the corresponding monochromatic light source module 100, and the deflection angles of the deflection prisms 220 corresponding to any two monochromatic light source modules 100 are equal to the light. It can be understood that the equality mentioned here refers to equality within a certain error range. In the present embodiment, the deflection prism groups corresponding to the three monochromatic light source modules 100 can be designed to have the same structure. By changing the angle at which the deflection prism groups are arranged, the same deflection prism group can deflect the outgoing light of different monochromatic light source modules 100 at the same angle in different directions, so that the light emitted by the three deflection prism groups can be parallel.

[0076] When each monochromatic light source module 100 is parallel to the plane corresponding to the three-dimensional rectangular coordinate system, the deflection angle α satisfies: At this time, the output light of the three deflection prism groups is three parallel monochromatic light beams, and a scattering plate is required, or different areas of the focusing lens are designed according to the output light of the three deflection prism groups to mix and converge the three monochromatic light beams to form white light.

[0077] In one embodiment, the monochromatic light source module 100 includes a light source component 110 and a collimator 120, the light emitting surface of the collimator 120 is the light emitting surface of the monochromatic light source module 100, the light emitting surface of the light source component 110 emits light toward the collimator 120, and the light emitting surface of the light source component 110 is parallel to the light emitting surface of the collimator 120. In this way, the outgoing light of the light source component 110 can be collimated by the collimator 120 to form parallel light, and the outgoing light of the monochromatic light source module 100 can also become parallel light.

[0078] Specifically, the light source 110 may be a laser light source, which can provide a very wide color gamut and reproduce richer and more saturated colors. The laser light source has high brightness, and the brightness decays slowly over time, so the service life is long and the replacement frequency is low, thereby reducing the maintenance cost in long-term use.

[0079] The light source 110 may also be an LED light source. The LED light source can also provide good color expression, especially when the three primary colors RGB are independently controlled, accurate color reproduction can be achieved. The LED light source is small in size and light in weight, and is very suitable for miniaturization and portable applications of projection equipment.

[0080] The light source 110 may be a monochromatic light source. Thus, the structure of the light source 110 is simple, the system design can be more simplified, and the light efficiency is higher, which is conducive to reducing costs and facilitating later maintenance.

[0081] The light source 110 can also be a complex light source combined with filters of corresponding colors. In this way, the light source 110 has richer colors and can produce a very wide color range, thereby achieving high-quality color images. Moreover, the filters can be adjusted as needed to change the color characteristics of the output, providing users with more color control options. It is suitable for a variety of application scenarios, from home entertainment to professional-level presentations, and can meet different requirements for image quality and color expression. In addition, appropriate filter design can help improve the contrast and color saturation of the image, making the picture more vivid and realistic.

[0082] Specifically, the collimating element 120 is configured as at least one of a reflective cup, a total reflection lens, a collimating light cavity, a fly-eye lens, a convex lens group, a lens group of a convex lens and a concave lens, a lens in which a total reflection lens and a fly-eye lens are combined into one, and a lens in which a total reflection lens and a convex lens are combined into one.

[0083] Among them, for Figure 3 The lens in which the total reflection lens and the fly-eye lens are combined into one as shown on the left side is used as the collimating element 120. The total reflection lens and the fly-eye lens can be formed in one piece, or the two can be formed separately, and then the fly-eye lens is fixed to the light-emitting surface of the total reflection lens by bonding or the like, so that the two are combined into one piece. Figure 3 The lens shown on the right, which is a combination of a total reflection lens and a convex lens, is used as the collimating element 120 , and the same is true.

[0084] In terms of optical performance, for the lens that combines a total reflection lens and a fly-eye lens into one, the fly-eye lens part can provide highly uniform light distribution, while the total reflection part ensures good collimation of the light beam. The combination of the two can produce a light beam that is both uniform and collimated, which is suitable for precision measurement, laser processing and other occasions with strict requirements on beam quality; for the lens that combines a total reflection lens and a convex lens into one, since the total reflection lens and the convex lens are integrated together, the shape and direction of the light beam can be more effectively controlled. The total reflection lens is usually used to generate parallel light beams or focused light beams, while the convex lens helps to further adjust the divergence angle of the light beam, thereby achieving a better collimation effect.

[0085] In terms of structure, the lens that combines a total reflection lens and a compound eye lens into one, as well as the lens that combines a total reflection lens and a convex lens into one, can significantly reduce the complexity and volume of the system by integrating the two types of lenses into one, which makes the entire optical system more compact and easy to install in applications with limited space. The overall optical efficiency is improved by reducing the loss that may occur when light is transmitted from one element to another (such as reflection or refraction loss in the air gap). This is especially important for applications that require efficient transmission of light energy.

[0086] Among them, the one-piece design can also reduce the number of separate parts, thereby simplifying the manufacturing and assembly process, which can not only reduce production costs, but also improve the reliability and consistency of the system because it reduces problems caused by assembly errors. In addition, one-piece molded lenses usually have better mechanical strength and stability, can withstand higher temperature changes and external shocks, and extend service life. In addition, due to the simple structure and no moving parts, this type of lens often requires less maintenance. At the same time, better sealing helps prevent dust and other contaminants from entering the interior and maintain good optical performance.

[0087] In one embodiment, if Figure 1 As shown, the optical system further includes a light homogenization module 300, which is disposed downstream of the optical path of the beam combining module 200. In this way, the light homogenization module 300 can redistribute the light energy so that the brightness of the final projected image is more uniform, which helps to eliminate the problem of inconsistent brightness in different areas, thereby providing a consistent visual experience. Of course, in other embodiments, the light can also be homogenized by other means, and the image can be pre-processed by a software algorithm to compensate for the brightness difference caused by the uneven light source.

[0088] In one embodiment, the light homogenization module 300 includes at least one of a fly-eye lens, a convex lens, a concave lens, and a lens in which a convex lens and a fly-eye lens are combined into one.

[0089] Among them, for Figure 4 The lens in which the convex lens and the fly-eye lens are combined into one is shown as the light homogenizing module 300. The convex lens and the fly-eye lens can be formed in one piece, or the two can be formed separately and then the fly-eye lens is fixed to the incident surface and the exit surface of the convex lens by bonding or the like, so that the two are combined into one piece.

[0090] In terms of optical performance, a lens that combines a convex lens and a compound eye lens can combine the advantages of a convex lens and a compound eye lens, and the two can make up for each other's disadvantages. The compound eye lens is composed of many small lens units, each of which can focus light independently. This structure helps to produce a more uniform distribution of light on the target surface, because the superposition effect of multiple point light sources can reduce the uneven brightness caused by a single strong light source. The design of the compound eye lens allows it to have a very wide field of view, which means that it can capture light at more angles. When combined with a convex lens, the field of view can be expanded while maintaining good focusing performance. Traditional single convex lenses are often accompanied by a certain degree of aberration problems, such as spherical aberration, chromatic aberration, etc. The compound eye lens, due to its special porous structure, can alleviate these problems to a certain extent and provide clearer and undistorted image quality. Such a combined lens can better collect and guide incident light, thereby improving the optical efficiency of the overall system, and the design parameters can be flexibly adjusted according to specific application requirements to achieve the best optical performance. Despite the integration of two lenses with different functions, the entire system can still maintain a relatively small size and weight through clever design, which is especially important for portable devices or applications with limited space.

[0091] In one embodiment, if Figure 1As shown, the optical system further includes a reflector 400 and an optical chip 500, wherein the reflector 400 and the optical chip 500 are located downstream of the optical path of the beam combining module 200, and one of the reflector 400 and the optical chip 500 is configured to reflect light to the other. Through the cooperation of the reflector 400 and the optical chip 500, the direction of the outgoing light of the optical system can be flexibly adjusted, wherein the reflector 400 can be located upstream of the optical path of the optical chip 500, that is, the reflector 400 receives the outgoing light from the light homogenizing module 300 and reflects the light to the optical chip 500, and the reflector 400 can also be located downstream of the optical path of the optical chip 500, that is, the optical chip 500 receives the outgoing light from the light homogenizing module 300 and reflects the light to the reflector 400. It should be noted that, of the reflector 400 and the optical chip 500, the one located downstream needs to avoid the incident light of the other located upstream, and the one located upstream needs to avoid the reflected light of the other located downstream, so that the two do not interfere with each other to avoid excessive loss of light energy. The reflector 400 and the optical chip 500 can be arranged at an acute angle, which is greater than or equal to 40 degrees and less than or equal to 50 degrees, preferably 45 degrees.

[0092] Without loss of generality, the optical chip 500 is configured as an LCoS (Liquid Crystal on Silicon) chip. Of course, in other embodiments, the optical chip 500 may also be a reflective display device.

[0093] Further, in this embodiment, the center normal of the reflector 400 and the center normal of the optical chip 500 are coplanar, and the plane where the center normals of the two are coplanar is parallel to any one of the xoy plane, xoz plane and yoz plane of the three-dimensional rectangular coordinate system. The center normal of the reflector 400 and the center normal of the optical chip 500 are coplanar, which can improve the symmetry of the reflector 400 and the optical chip 500 and facilitate the position layout of the two in the optical system. When the plane where the center normals of the two are coplanar is parallel to any one of the xoy plane, xoz plane and yoz plane of the three-dimensional rectangular coordinate system, the distribution direction of the reflector 400 and the optical chip 500 can be changed. It can be understood that when the plane where the center normals of the two are located is parallel to a certain plane of the three-dimensional rectangular coordinate system, the distribution direction of the two will be parallel to the plane, which can reduce the space occupied by the reflector 400 and the optical chip 500 in a certain direction. For example, when the distribution direction of the reflector 400 and the optical chip 500 is parallel to the xoy plane, the space occupied by the two in the z direction will be reduced. In this way, the distribution direction of the reflector 400 and the optical chip 500 can be flexibly changed according to the needs of the spatial layout.

[0094] The present invention also proposes a projector, which includes an optical system. The specific structure of the optical system refers to the above-mentioned embodiments. Since the projector adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0095] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An optical system, characterized in that: It comprises a beam combining module and three monochromatic light source modules emitting light toward the beam combining module, wherein the three monochromatic light source modules are respectively a first light source module, a second light source module and a third light source module; A three-dimensional rectangular coordinate system is established with the light-emitting surface of the first light source module as the xoy plane, the light-emitting surface of the second light source module is parallel to or forms an acute angle with the xoz plane of the three-dimensional rectangular coordinate system, and the light-emitting surface of the third light source module is parallel to or forms an acute angle with the yoz plane of the three-dimensional rectangular coordinate system; The beam combining module is used to convert the light propagation directions of the three monochromatic light source modules so that the light of the three monochromatic light source modules are combined and emitted in parallel in the beam combining module.

2. The optical system according to claim 1, wherein: The beam combining module is configured to transmit the light from one of the monochromatic light source modules and reflect the light from the other two monochromatic light source modules, so that the light from the three monochromatic light source modules is emitted from the beam combining module in parallel.

3. The optical system according to claim 2, characterized in that The beam combining module comprises a first optical filter and a second optical filter intersecting each other, the first optical filter has a first optical film and a second optical film formed on two surfaces thereof, and the second optical filter has a third optical film and a fourth optical film formed on two surfaces thereof; The first optical film is arranged relative to the optical path of the first light source module and is configured to reflect the incident light corresponding to the first light source module; the second optical film is arranged relative to the optical path of the second light source module, and both surfaces of the first filter avoid the outgoing optical path of the third light source module; The third optical film is arranged relative to the optical path of the third light source module and is configured to reflect the incident light corresponding to the third light source module. The fourth optical film is arranged relative to the optical path of the second light source module, and both surfaces of the second filter avoid the outgoing optical path of the first light source module. Furthermore, the first filter is configured to transmit incident light corresponding to the second light source module and the third light source module, and the second filter is configured to transmit incident light corresponding to the first light source module and the second light source module.

4. The optical system according to claim 3, characterized in that The first optical film is configured to highly reflect incident light corresponding to the first light source module, and the first optical film and the second optical film are both configured to highly transmit incident light corresponding to the second light source module and the third light source module; The third optical film is configured to highly reflect incident light corresponding to the third light source module, and the third optical film and the fourth optical film are configured to highly transmit incident light corresponding to the first light source module and the second light source module.

5. The optical system according to claim 3, characterized in that The first light source module is a red light source module, the second light source module is a green light source module, the third light source module is a blue light source module, the first optical film has high reflectivity for red light, high transmittance for green light and high transmittance for blue light, the second optical film has high transmittance for green light and high transmittance for blue light, the third optical film has high reflectivity for blue light, high transmittance for red light and high transmittance for green light, and the fourth optical film has high transmittance for red light and high transmittance for green light.

6. The optical system according to claim 3, characterized in that The angle between the first filter and the yoz plane of the three-dimensional rectangular coordinate system is 80 degrees to 90 degrees; And / or, the angle between the first filter and the xoy plane of the three-dimensional rectangular coordinate system is 40 degrees to 50 degrees; And / or, the angle between the second filter and the xoy plane of the three-dimensional rectangular coordinate system is 80 degrees to 90 degrees; And / or, the included angle between the second filter and the yoz plane of the three-dimensional rectangular coordinate system is 40 degrees to 50 degrees.

7. The optical system according to claim 1, wherein: The beam combining module is configured to refract the light of the monochromatic light source module so that the light of the three monochromatic light source modules are emitted from the beam combining module in parallel.

8. The optical system according to claim 7, characterized in that The beam combining module is configured as at least one deflection prism, and one beam combining module is configured corresponding to one monochromatic light source module.

9. The optical system according to claim 8, characterized in that The beam combining module comprises a plurality of columns of deflection prisms, and the incident surfaces of the plurality of columns of deflection prisms are sequentially connected along a direction parallel to the light emitting surfaces of the corresponding monochromatic light source modules; And / or, the incident surface of the deflection prism is parallel to the light emitting surface of the corresponding monochromatic light source module, and the deflection angles of the deflection prisms corresponding to any two monochromatic light source modules are equal.

10. The optical system according to claim 1, wherein: The optical system further includes a reflector and an optical chip, wherein the reflector and the optical chip are located downstream of the optical path of the beam combining module, and one of the reflector and the optical chip is configured to reflect light toward the other.

11. The optical system according to claim 10, wherein: The central normal of the reflector and the central normal of the optical chip are coplanar, and the plane where the central normals of the two mirrors coexist is parallel to any one of the xoy plane, the xoz plane and the yoz plane of the three-dimensional rectangular coordinate system.

12. A projector, characterized in that: An optical system comprising any one of claims 1 to 11.

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