Lighting systems and laser projection equipment

Abstract

The present application discloses an illumination system and laser projection equipment, belonging to the field of laser technology. The illumination system includes an illumination assembly and a lens assembly; the illumination assembly includes a lens assembly, a reverse total internal reflection prism, and a light valve arranged in sequence along the optical path of the illumination assembly. The lens assembly directs the received light beam to the reverse total internal reflection prism, and the reverse total internal reflection prism outputs the light beam to the light valve, which is used to direct the received light beam to the lens assembly; the lens assembly includes a galvanometer and multiple lenses, the multiple lenses including a compensation lens, which is located in the light incident direction of the galvanometer and is used to reduce the light spot of the light beam incident on the galvanometer. This solves the problem of the large size of the illumination system in the related art and achieves the effect of reducing the volume of the illumination system.

Description

Technical Field

[0001] The present application relates to the field of laser technology, and in particular to an illumination system and a laser projection device. Background Art

[0002] Ultra-short-throw projectors are currently widely used, capable of projecting large images from a short distance. Their advantages, such as high space efficiency and compact size, make them highly sought after. A light valve (DMD) is a digital micromirror device that typically uses the short side of the light valve to receive incident light, minimizing the size of the illumination system.

[0003] A related art illumination system includes a light-diffusing component, a lens assembly, a plane reflector, and a compensating prism. Because a light valve and the light-diffusing component can better receive light at a certain angle, a lens assembly, a plane reflector within the lens assembly, and a compensating prism positioned parallel to the light valve are sequentially positioned between the light-diffusing component and the light valve. Light enters the light-diffusing component, passes through a portion of the lens within the lens assembly, is reflected by the plane reflector, and then passes through a portion of the lens and the compensating prism positioned parallel to the light valve. The light then reflects back from the compensating prism to the light valve, passing through the light valve and entering the projection lens to form an image.

[0004] The above lighting system is relatively large in size. Summary of the Invention

[0005] The embodiments of the present application provide a lighting system and a laser projection device, and the technical solutions are as follows:

[0006] In one aspect, a lighting system is provided, comprising a lighting assembly and a lens assembly;

[0007] The lighting assembly includes a lens assembly, a reverse total internal reflection prism, and a light valve sequentially arranged along the optical path of the lighting assembly. The lens assembly guides a received light beam to the reverse total internal reflection prism, and the reverse total internal reflection prism outputs the light beam to the light valve. The light valve is used to guide the received light beam to the lens assembly.

[0008] The lens assembly includes a galvanometer and a plurality of lenses. The plurality of lenses includes a compensation lens. The compensation lens is located in the light incident direction of the galvanometer and is used to reduce the light spot of the light beam incident on the galvanometer.

[0009] Optionally, the lens assembly includes a rear lens group and a front lens group sequentially arranged along the optical path direction of the lens assembly, and the rear lens group and the front lens group each include at least one lens;

[0010] The compensation lens is located in the rear mirror group, and the galvanometer is located in the light-emitting direction of a lens of the rear mirror group.

[0011] Optionally, the compensation lens, the galvanometer, and other lenses among the multiple lenses except the compensation lens are arranged in sequence along the optical path direction of the lens assembly.

[0012] Optionally, the multiple lenses include at least one focusing lens located in the light incident direction of the galvanometer, and the at least one focusing lens is multiplexed as the compensation lens.

[0013] Optionally, the size of the light incident surface of the galvanometer mirror matches the size of the light spot of the light beam incident on the galvanometer mirror.

[0014] Optionally, the lens assembly includes a first lens, a second lens, and a third lens sequentially arranged in a direction close to the reverse total internal reflection prism.

[0015] Optionally, the optical axis of the first lens is parallel to a first optical axis of the light beam incident on the first lens, the optical axis of the second lens is parallel to the first optical axis, the optical axis of the third lens has a first angle with the first optical axis, and the angle between the optical axis of the third lens and the light incident surface of the reverse total internal reflection prism is greater than the angle between the optical axis of the second lens and the light incident surface of the reverse total internal reflection prism;

[0016] The first lens is used to reduce the spot size of the light beam and collimate the light beam, the second lens is used to reduce the spot size of the light beam, and the third lens is used to balance the field of view optical path.

[0017] Optionally, the reverse total internal reflection prism includes a space enclosed by a first side surface, a bottom surface, and a second side surface; the third lens guides the light beam to the bottom surface and enters the total internal reflection prism; the light beam passes through the first side surface and exits the total internal reflection prism; the light beam emitted from the first side surface is reflected by the light valve and then enters the bottom surface of the total internal reflection prism from the first side surface; after reflection from the bottom surface, it is emitted to the second side surface and passes through the second side surface to the compensation lens; the compensation lens guides the light beam to the galvanometer;

[0018] The compensation lens is located on the second side surface of the total internal reflection prism, and the compensation lens is used to converge the light beam.

[0019] Optionally, the lighting system further includes a light uniformity component, and the light uniformity component is located on the light incident side of the lens component.

[0020] On the other hand, a laser projection device is provided, comprising the lighting system described in the first aspect.

[0021] The beneficial effects of the technical solution provided by the embodiments of the present application are:

[0022] A lighting system is provided, comprising a lighting assembly and a lens assembly, wherein the lighting assembly comprises a lens assembly, a reverse total internal reflection prism, and a light valve arranged in sequence along the optical path of the lighting assembly. The lens assembly directs the received light beam to the reverse total internal reflection prism, which then outputs the light beam to the light valve. The light valve directs the received light beam to the lens assembly. The multiple lenses in the lens assembly include a compensation lens, which is located in the light incident direction of the galvanometer. The compensation lens reduces the spot size of the light beam emitted from the light valve and directs it to the galvanometer, so that the effective light receiving port of the galvanometer can receive the entire light beam, thereby improving the effective accuracy of the lighting system. Furthermore, the lens assembly, the reverse total internal reflection prism, and the light valve are arranged in sequence along the optical path of the lighting assembly, eliminating the need for a reflector and reducing the volume of the lighting system. This solves the problem of the large volume of the lighting system in the related art, achieving the effect of reducing the volume of the lighting system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 It is a schematic diagram of the implementation environment involved in the embodiments of the present application;

[0025] Figure 2 yes Figure 1 The structural diagram of the lighting system shown;

[0026] Figure 3 This is a structural diagram of a lighting system provided by an embodiment of the present application;

[0027] Figure 4 is a structural diagram of another lighting system provided in an embodiment of the present application;

[0028] Figure 5 A beam comparison diagram provided in an embodiment of the present application;

[0029] Figure 6 for Figure 4 Schematic diagram of the three-dimensional structure of the inverted total internal reflection prism;

[0030] Figure 7 A schematic structural diagram of a laser projection device provided in an embodiment of the present application.

[0031] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0033] Figure 1 Schematic diagram of an implementation environment involved in an embodiment of the present application, which may include an ultra-short-throw projector 10 and a projection screen 20.

[0034] The ultra-short-throw projector 10 may include an illumination assembly 11 and a projection lens 12. The illumination assembly 11 is used to provide light to the projection lens 12, and the projection lens 12 is used to project a preset pattern onto the projection screen 20 according to the light provided by the illumination assembly 11.

[0035] The projection screen 20 is used to carry the pattern projected by the projection lens 12. The projection screen 20 can be made of various materials, such as polyvinyl chloride (PVC), metal, glass fiber, and glass beads, etc., and the embodiment of the present application does not limit this.

[0036] Figure 2 The figure is a schematic diagram of the structure of an illumination system in the related art. The illumination system includes an illumination assembly and a lens 12. The illumination assembly includes a light-homogenizing component 111, a lens assembly 112, a plane reflector 113, a total internal reflection prism 114, and a light valve 115. The lens assembly 112 includes a first lens 1121, a second lens 1122, and a third lens 1123. After light beam 116 is emitted from light-homogenizing component 111, it passes through first lens 1121, which is arranged perpendicularly along the optical axis of the system, and then to second lens 1122. At this time, since the short side of the light valve receives light, plane reflector 113 is provided to reflect light beam 116 and change its direction. The redirected light beam 116 then enters third lens 1123, is then emitted perpendicularly from third lens 1123 to total internal reflection prism 114, and is then reflected from total internal reflection prism 114 to light valve 115. From light valve 115, it is emitted to lens 12.

[0037] Since the above-mentioned lighting system is equipped with a plane reflector, the optical path is an inclined optical path, and each lens is also arranged inclined along the optical path, resulting in a relatively thick overall thickness of the lighting system. Other components in the entire optical engine system are arranged in conjunction with the lighting system, making the entire ultra-short-throw projector larger in size.

[0038] The embodiments of the present application provide a lighting system and a laser projection device, which can solve the problems in the above-mentioned related technologies.

[0039] Figure 3 : is a schematic diagram of the structure of a lighting system provided in an embodiment of the present application. The structure of the lighting system 50 is as follows:

[0040] The lighting system 50 includes a lighting assembly 30 and a lens assembly 40 .

[0041] The lighting assembly 30 includes a lens assembly 31, a reverse total internal reflection prism 32 and a light valve 33 arranged in sequence along the optical path direction of the lighting assembly 30. The lens assembly 31 guides the received light beam to the reverse total internal reflection prism 32, and the reverse total internal reflection prism 32 outputs it to the light valve 33. The light valve 33 is used to guide the received light beam to the lens assembly 40.

[0042] The lens assembly 40 includes a galvanometer mirror 42 and a plurality of lenses 41 . The plurality of lenses 41 include a compensation lens 411 . The compensation lens 411 is located in the light incident direction of the galvanometer mirror 42 and is used to reduce the light spot of the light beam incident on the galvanometer mirror 42 .

[0043] In summary, an embodiment of the present application provides a lighting system, including a lighting assembly and a lens assembly, wherein the lighting assembly includes a lens assembly, a reverse total internal reflection prism, and a light valve arranged in sequence along the light path direction of the lighting assembly, the lens assembly guides the received light beam to the reverse total internal reflection prism, and the reverse total internal reflection prism outputs it to the light valve, and the light valve guides the received light beam to the lens assembly, and the multiple lenses in the lens assembly include a compensation lens, which is located in the light incident direction of the galvanometer, and guides the light beam emitted from the light valve to the galvanometer after reducing the light spot, so that the effective light receiving port of the galvanometer can receive the entire light beam, thereby improving the effective accuracy of the lighting system. Moreover, the lens assembly, the reverse total internal reflection prism, and the light valve are arranged in sequence along the light path direction of the lighting assembly, and there is no need to set a reflector, thereby reducing the volume of the lighting system. The problem of the large volume of the lighting system in the related art is solved, and the effect of reducing the volume of the lighting system is achieved.

[0044] like Figure 4 As shown, it is a structural schematic diagram of another lighting system provided in an embodiment of the present application.

[0045] Optionally, the lens assembly 40 includes a rear lens group 43 and a front lens group 44 arranged in sequence along the optical path direction of the lens assembly 40, and the rear lens group 43 and the front lens group 44 each include at least one lens; the compensation lens 411 is located in the rear lens group 43, and the galvanometer 42 is located in the light-emitting direction of a lens of the rear lens group 43. The compensation lens 411 is a plano-convex or biconvex lens with a curvature, so the compensation lens 411 is located in the lens assembly 40. The compensation lens 411 can reduce the irradiation area of ​​the light beam by reducing the spot size. The galvanometer 42 is usually a flat piece of glass, which realizes the staggered transmission of the light beam through high-frequency vibration. In the related art, in order to improve the resolution of ultra-short-focus projectors with LED light sources, ultra-short-focus projectors with laser light sources are used. The present application adds a galvanometer to the ultra-short-focus projector with a laser light source, which can make the resolution of the ultra-short-focus projector higher than the resolution of the light valve 33, thereby improving the resolution from 720P in the related art to 1080P. The rear mirror group 43 is arranged near the reverse total internal reflection prism 32. The lens assembly 31 guides the received light beam to the reverse total internal reflection prism 32, and the reverse total internal reflection prism 32 outputs it to the light valve 33. The light valve 33 guides the received light beam to the rear mirror group 43 in the lens assembly 40, and then guides it from the rear mirror group 43 to the front mirror group 44 to complete the imaging.

[0046] Optionally, the compensating lens 411, the galvanometer mirror 42, and the other lenses among the multiple lenses 41 except the compensating lens 411 are sequentially arranged along the optical path direction of the lens assembly 40. The compensating lens 411 is located between the galvanometer mirror 42 and the reverse total internal reflection prism 32, and can reduce the light beam and guide it to the galvanometer mirror. After the resolution is improved by the deflection of the galvanometer mirror 42, the light beam is formed through the multiple lenses 41, ultimately achieving an imaging effect with high resolution and high precision.

[0047] Optionally, the size of the light incident surface of the galvanometer mirror 42 matches the size of the light spot of the light beam incident on the galvanometer mirror 42. The size of the light incident surface of the galvanometer mirror 42 is also the effective aperture of the galvanometer mirror 42. Figure 5 This is a beam comparison diagram provided in an embodiment of the present application. Galvanometer mirror 42 includes a galvanometer structure 421, which is connected to galvanometer mirror 42 and is used to provide deflection power for galvanometer mirror 42. Galvanometer structure 421 includes multiple components such as a circuit board. The size of the light incident surface of galvanometer mirror 42 is the size of the light incident surface of galvanometer mirror 42 itself, excluding the portion where galvanometer structure 421 connects to galvanometer mirror 42. Figure 5The dotted light beam is the light beam emitted from the reverse total internal reflection prism 32 when the compensating lens 411 is not added. The solid light beam is the light beam emitted from the compensating lens 411 after the compensating lens 411 is added. The shaded area between the dotted light beam and the solid light beam is the size of the light beam reduced by the compensating lens 411. When the compensating lens 411 is not added, a portion of the dotted light beam is irradiated onto the galvanometer structure 421, or irradiated outside the galvanometer structure 421. Therefore, this portion of the light beam cannot be deflected by the galvanometer 42 to achieve improved resolution, resulting in lower imaging accuracy, lower resolution, and poor imaging effect. In addition, this lost light will cause a loss of brightness of the entire device. After the compensation lens 411 is added in the present application, the light beam emitted from the reverse total internal reflection prism 32 passes through the compensation lens 411 to reduce the spot size, thereby reducing the incident area of ​​the light beam on the galvanometer 42. At this time, the size of the light beam spot incident on the galvanometer 42 matches the size of the light incident surface of the galvanometer 42. All light beams enter the size of the light incident surface of the galvanometer 42 and are deflected by the galvanometer 42, thereby improving the imaging accuracy, improving the imaging resolution, improving the imaging effect, and effectively avoiding the light loss inside the optical engine, thereby improving the brightness of the entire machine.

[0048] Optionally, the multiple lenses 41 include at least one focusing lens located in the light incident direction of the galvanometer 42, and at least one focusing lens is reused as a compensation lens 411. The function of the compensation lens 411 is to reduce the spot size and thus reduce the area of ​​the light beam entering the galvanometer 42. When the galvanometer satisfies the following three conditions and is set between the multiple lenses 41 in the lens assembly, the lens with a focusing function between the galvanometer 42 and the reverse total internal reflection prism 32 can be reused as a compensation lens. The three conditions that the galvanometer 42 satisfies among the multiple lenses in the lens assembly 40 include:

[0049] 1) The distance between the lenses is large enough to accommodate the galvanometer 42 and its components. The galvanometer components are relatively large. When placing the galvanometer 42 between the lenses, choose a location where the distance between the lenses can accommodate the galvanometer 42 and its components without adjusting the positions of other lenses.

[0050] 2) Place it in a position that improves imaging resolution. After exiting the reverse total internal reflection prism 32, the light beam enters the lens assembly 40, where it forms an image. The imaged light beam then strikes the projection screen, completing the image display. Among the multiple lenses in the lens assembly 40, when the galvanometer mirror 42 is located in the rear lens group 43, the resolution improvement achieved by the light beam deflection by the galvanometer mirror 42 is greater. Therefore, placing the galvanometer mirror 42 in a position that improves imaging resolution is one of the criteria for selecting its position in the lens assembly 40.

[0051] 3) The size of the light beam incident on the galvanometer mirror 42 is smaller than the size of the light incident surface of the galvanometer mirror 42. When the galvanometer mirror 42 is located at other positions among the multiple lenses, the lens between the galvanometer mirror 42 and the reverse total internal reflection prism 32 should include a lens that has the function of converging the light beam so that the size of the light incident surface of the galvanometer mirror 42 matches the size of the light spot of the light beam incident on the galvanometer mirror 42, thereby not affecting the imaging accuracy of the galvanometer mirror.

[0052] Optionally, the lens assembly 31 includes a first lens 311, a second lens 312, and a third lens 313, which are sequentially arranged in a direction close to the reverse total internal reflection prism 32. The third lens 313 is closest to the reverse total internal reflection prism 32. The first lens 311 can be a spherical lens or an aspherical lens; the second lens 312 can be a spherical lens or an aspherical lens; and the third lens 313 can be a spherical lens or an aspherical lens. The specific lens specifications are not limited in this embodiment of the application.

[0053] Optionally, the optical axis of the first lens 311 is parallel to the first optical axis of the light beam incident on the first lens 311, the optical axis of the second lens 312 is parallel to the first optical axis, the optical axis of the third lens 313 has a first angle with the first optical axis, and the angle between the optical axis of the third lens 313 and the incident surface of the reverse total internal reflection prism 32 is greater than the angle between the optical axis of the second lens 312 and the incident surface of the reverse total internal reflection prism 32. That is, the first lens 311 is arranged perpendicular to the first optical axis, the second lens 312 is arranged perpendicular to the first optical axis, and the third lens 313 is arranged at an angle relative to the first optical axis.

[0054] The light beam is emitted from the third lens 313 toward the reverse total internal reflection prism 32. If the third lens 313 is positioned perpendicular to the first optical axis, the distance between the third lens 313 and the reverse total internal reflection prism 32 is large to prevent the light beams from interfering with each other. However, this results in the entire lighting assembly 30 being longer along the first optical axis, thereby increasing the volume of the lighting assembly 30. In the embodiment of the present application, the third lens 313 is tilted to avoid interference between the third lens 313 and the reverse total internal reflection prism 32, while also shortening the length of the lighting assembly 30 along the first optical axis, thereby reducing the volume of the lighting assembly 30. The specific tilt angle of the third lens 313 is not limited in the embodiment of the present application. The first lens 311 is close to the laser emitter, and the light beam is relatively scattered. Therefore, the first lens 311 converges the light beam, reduces the spot size of the light beam, and collimates the light beam. After receiving the light beam converged by the first lens 311, the second lens 312 further converges the light beam and reduces the spot size of the light beam. The third lens 313 can shorten the length of the lighting assembly 30 along the first optical axis while balancing the field of view optical distance.

[0055] Figure 6 for Figure 4 Schematic diagram of the three-dimensional structure of the inverted total internal reflection prism.

[0056] Optionally, the reverse total internal reflection prism 32 includes a space enclosed by a first side surface m1, a bottom surface m2, and a second side surface m3. The third lens guides the light beam to the bottom surface m2 and injects it into the reverse total internal reflection prism 32. The light beam passes through the first side surface m1 and exits the reverse total internal reflection prism 32. The light beam emitted from the first side surface m1 is reflected by the light valve and then enters the bottom surface m2 of the reverse total internal reflection prism 32 from the first side surface m1. After reflection from the bottom surface m2, it is emitted to the second side surface m3 and passes through the second side surface m3 to the compensation lens. The compensation lens guides the light beam to the galvanometer; the compensation lens is located on the second side surface m3 of the reverse total internal reflection prism 32 and is used to converge the light beam. A triangular prism is a prism made of transparent material with an optically triangular cross-section. The Reverse Total Internal Reflection (RTIR) prism is an isosceles right-angled prism. Its hypotenuse serves as the light-entering surface for the incident light beam, which also forms the bottom surface m2 of the RTIR prism 32. The RTIR prism 32 directs the light beam emitted from the lens assembly 31 to the light valve 33. The light beam reflected from the light valve 33 is then reflected back to the compensation lens 411 in the lens assembly 40. The compensation lens 411 reduces the spot size, converges the beam, and then projects it toward the galvanometer mirror 42.

[0057] Optionally, the lighting system further includes a light homogenizing component 34, which is located on the light incident side of the lens component 31. The light homogenizing component 34 can optimize the spot shape of the incident light beam and homogenize the light beam. Ultra-short-focus projectors in related technologies generally include ultra-short-focus projectors with laser light sources and ultra-short-focus projectors with LED light sources. Ultra-short-focus projectors with LED light sources can achieve miniaturization, but the resolution of ultra-short-focus projectors with LED light sources is mostly 720P, while ultra-short-focus projectors with laser light sources can improve resolution and display brightness, thereby making the picture contrast of the laser ultra-short-focus projector better, the imaging clearer, the colors more vivid, and the brightness higher. Since the laser beam in the laser ultra-short-focus projector has the characteristics of quality differences and easy deviation in directionality, in the lighting system provided in the embodiment of the present application, a light homogenizing component 34 can be set to receive the laser beam, so that the laser beam is homogenized and the light spot is optimized before passing through the light homogenizing component 34 and entering the lens component.

[0058] The light homogenization assembly 34 includes a light pipe. The light pipe is a transparent glass tube with a rectangular shape and area. The laser beam enters the illumination system through the light pipe's light pipe entrance and then exits the light pipe toward the lens assembly 31. During the process of passing through the light pipe, the laser beam is homogenized and the light spot is optimized.

[0059] The light homogenizing component 34 may also include a fly-eye lens. A fly-eye lens is typically formed by combining a series of small lenses. Two fly-eye lens arrays are arranged in parallel to split the incoming laser beam spot. The split spots are then accumulated through a subsequent focusing lens, thereby homogenizing the beam and optimizing the spot. In an illumination system, the light homogenizing component 34 may be a light pipe or a fly-eye lens, which is not limited in this embodiment of the present application.

[0060] In addition, the effective focal lengths of the lens assembly in the embodiment of the present application are as follows: the effective focal length of the first lens 311 is F1, the effective focal length of the second lens 312 is F2, and the effective focal length of the third lens 313 is F3;

[0061] F1 satisfies the formula 0.1<|F1 / F|<0.5;

[0062] F2 satisfies the formula 0.8<|F2 / F|<1.6;

[0063] F3 satisfies the formula 0.3<|F3 / F|<0.8;

[0064] Where F is the effective focal length of the lighting assembly 30. The effective focal length is a measure of light convergence or divergence in an optical system, and refers to the distance from the center of the lens to the focal point where the light converges. In the embodiment of the present application, the focal lengths of the first lens 311, the second lens 312, and the third lens 313 satisfy the above formula. The effective focal lengths of the lenses can range from other ranges, and are not limited in the embodiment of the present application.

[0065] In summary, an embodiment of the present application provides a lighting system, including a lighting assembly and a lens assembly, wherein the lighting assembly includes a lens assembly, a reverse total internal reflection prism, and a light valve arranged in sequence along the light path direction of the lighting assembly, the lens assembly guides the received light beam to the reverse total internal reflection prism, and the reverse total internal reflection prism outputs it to the light valve, and the light valve guides the received light beam to the lens assembly, and the multiple lenses in the lens assembly include a compensation lens, which is located in the light incident direction of the galvanometer, and guides the light beam emitted from the light valve to the galvanometer after reducing the light spot, so that the effective light receiving port of the galvanometer can receive the entire light beam, thereby improving the effective accuracy of the lighting system. Moreover, the lens assembly, the reverse total internal reflection prism, and the light valve are arranged in sequence along the light path direction of the lighting assembly, and there is no need to set a reflector, thereby reducing the volume of the lighting system. The problem of the large volume of the lighting system in the related art is solved, and the effect of reducing the volume of the lighting system is achieved.

[0066] like Figure 7As shown, it is a schematic structural diagram of a laser projection device provided in an embodiment of the present application. The laser projection device 60 includes the lighting assembly 30, lens assembly 40 and other light source components, heat dissipation components, etc. in any of the above embodiments. The light beam emitted by the blue laser 61 passes through the telescope system and the fly-eye lens and is first incident on the dichroic plate 62. The dichroic plate 62 guides the laser light to the lens assembly 63, and then passes through the lens assembly 63 and enters the fluorescent wheel 64. The fluorescent wheel 64 reflects the fluorescent light and then enters the lens assembly 63 again. After being converged by the lens assembly 63, it is incident on the dichroic plate 62. The dichroic plate 62 transmits the light beam and guides it to the reflector adjacent to the dichroic plate 62. After reflection, it transmits the dichroic plate 62 again, passes through the converging lens, and enters the light homogenizing component.

[0067] Related technologies such as Figure 2 As shown, a reflector is provided in the lighting system. In order for the light valve to completely receive the light emitted by the light-uniform component, the overall light path in the lighting system is tilted. After the light-uniform component and the light valve are tilted, other components in the laser projection device that match the lighting system, such as the light source component and the heat dissipation component, are all tilted, thereby making the entire laser projection device larger in size. When the laser projection device is a desktop ultra-short-focus laser projection device, one of its advantages is its small size. Ultra-short-focus projectors with LED light sources can achieve miniaturization, but the resolution of ultra-short-focus projectors with LED light sources is mostly 720P, which cannot achieve high-resolution effects. In summary, the desktop ultra-short-focus laser projection device in the related art cannot achieve both improved resolution and reduced device size.

[0068] The laser projection device 60 provided in an embodiment of the present application includes the lighting system of any of the above-mentioned embodiments, wherein the first lens of the lens assembly in the lighting system is arranged vertically along the first optical axis to converge the light beam, reduce the spot size of the light beam, and collimate the light beam. The second lens is arranged vertically along the first optical axis to further converge the light beam and reduce the spot size of the light beam. The third lens is arranged tilted along the first optical axis to avoid interference with the reverse total internal reflection prism. At the same time, it can also balance the optical path of each field of view, shorten the lens spacing of the lens assembly in the lighting assembly and the distance between the lens assembly and the reverse total internal reflection prism, so as to shorten the length of the lighting assembly along the first optical axis. In addition, the light homogenization assembly and the light valve in the present application can be arranged parallel to the first optical axis, thereby reducing the volume of the lighting assembly. Other light source assemblies, heat dissipation assemblies, etc. that match the lighting assembly in the entire laser projection device 60 can be placed vertically or horizontally with the lighting assembly, thereby reducing the volume of the entire laser projection device 60.

[0069] In addition, the laser projection device 60 in the embodiment of the present application includes a lens assembly. The galvanometer mirror in the lens assembly can improve the resolution of the light valve, enabling the laser projection device 60 to achieve a resolution of 1080p. The compensating lens in the lens assembly can reduce the spot size, thereby reducing the incident area of ​​the light beam when entering the galvanometer mirror, allowing the light beam to enter the effective aperture of the galvanometer mirror for deflection, thereby improving the resolution, imaging accuracy, and imaging effect of the laser projection device 60.

[0070] Therefore, a laser projection device 60 including an illumination system provided in an embodiment of the present application can be reduced in both length and thickness directions of the projection device, thereby reducing the volume of the device, while also achieving a higher resolution and improving the imaging accuracy of the projection device.

[0071] In summary, an embodiment of the present application provides a laser projection device, including an illumination system, which includes an illumination assembly and a lens assembly, wherein the illumination assembly includes a lens assembly, a reverse total internal reflection prism, and a light valve arranged in sequence along the optical path of the illumination assembly, the lens assembly guides the received light beam to the reverse total internal reflection prism, and the reverse total internal reflection prism outputs the light beam to the light valve, the light valve guides the received light beam to the lens assembly, the multiple lenses in the lens assembly include a compensation lens, the compensation lens is located in the light incident direction of the galvanometer, and the light beam emitted from the light valve is reduced in size and then directed to the galvanometer, so that the effective light receiving port of the galvanometer can receive the entire light beam, thereby improving the effective accuracy of the illumination system. Moreover, the lens assembly, the reverse total internal reflection prism, and the light valve are arranged in sequence along the optical path of the illumination assembly, and no reflector is required, thereby reducing the volume of the illumination system. This solves the problem of the large volume of the illumination system in the related art, and achieves the effect of reducing the volume of the illumination system.

[0072] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A lighting system, characterized in that: The lighting system includes a lighting assembly and a lens assembly; The lighting assembly includes a lens assembly, a reverse total internal reflection prism, and a light valve sequentially arranged along the optical path of the lighting assembly. The lens assembly guides a received light beam to the reverse total internal reflection prism, and the reverse total internal reflection prism outputs the light beam to the light valve. The light valve is used to guide the received light beam to the lens assembly. The lens assembly includes a galvanometer and a plurality of lenses, wherein the plurality of lenses include a compensation lens, and the compensation lens is located in the light incident direction of the galvanometer and is used to reduce the light spot of the light beam incident on the galvanometer; The plurality of lenses include at least one condensing lens located in the light incident direction of the galvanometer, and the at least one condensing lens is multiplexed as the compensation lens; The compensation lens is located between the galvanometer and the reverse total internal reflection prism. The light beam emitted by the light valve passes through the reverse total internal reflection prism and then is emitted to the compensation lens.

2. The lighting system according to claim 1, wherein The lens assembly comprises a rear lens group and a front lens group sequentially arranged along the optical path direction of the lens assembly, and each of the rear lens group and the front lens group comprises at least one lens; The compensation lens is located in the rear mirror group, and the galvanometer is located in the light-emitting direction of a lens of the rear mirror group.

3. The lighting system according to claim 1, wherein The compensation lens, the galvanometer, and other lenses among the plurality of lenses except the compensation lens are sequentially arranged along the optical path direction of the lens assembly.

4. The lighting system according to any one of claims 1 to 3, characterized in that: The size of the light incident surface of the galvanometer mirror matches the size of the light spot of the light beam incident on the galvanometer mirror.

5. The lighting system according to claim 1, wherein The lens assembly includes a first lens, a second lens and a third lens which are sequentially arranged in a direction close to the reverse total internal reflection prism.

6. The lighting system according to claim 5, characterized in that The optical axis of the first lens is parallel to the first optical axis of the light beam incident on the first lens, the optical axis of the second lens is parallel to the first optical axis, the optical axis of the third lens has a first angle with the first optical axis, and the angle between the optical axis of the third lens and the light incident surface of the reverse total internal reflection prism is greater than the angle between the optical axis of the second lens and the light incident surface of the reverse total internal reflection prism; The first lens is used to reduce the spot size of the light beam and collimate the light beam, the second lens is used to reduce the spot size of the light beam, and the third lens is used to balance the field of view optical path.

7. The lighting system according to claim 5, characterized in that The reverse total internal reflection prism includes a space surrounded by a first side surface, a bottom surface, and a second side surface; the third lens guides the light beam to the bottom surface and enters the reverse total internal reflection prism; the light beam passes through the first side surface and exits the reverse total internal reflection prism; the light beam emitted from the first side surface is reflected by the light valve and then enters the bottom surface of the reverse total internal reflection prism from the first side surface; after being reflected by the bottom surface, it is emitted to the second side surface and passes through the second side surface to the compensation lens; the compensation lens guides the light beam to the galvanometer; The compensation lens is located on the second side surface of the reverse total internal reflection prism, and the compensation lens is used to converge the light beam.

8. The lighting system according to claim 1, wherein: The lighting system further includes a light uniformity component, which is located on the light incident side of the lens component.

9. A laser projection device, characterized in that: The lighting system comprises any one of claims 1-8.

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