Projection equipment and projection system

Abstract

The utility model discloses a projection device and a projection system, and the projection device comprises a projection light source which is used for emitting a projection light beam; the illumination system is located on the light emitting side of the projection light source; the illumination system comprises a fly's-eye lens group and a light modulator located on the light emitting side of the fly's-eye lens group. The fly's-eye lens group comprises a first fly's-eye lens and a second fly's-eye lens which are sequentially arranged in the light propagation direction, each of the first fly's-eye lens and the second fly's-eye lens comprises a plurality of micro-lenses arranged in an array, and the light incident surfaces of the micro-lenses in the second fly's-eye lens are surfaces protruding towards one side of the first fly's-eye lens; and the projection lens is positioned on the light emitting side of the light modulator. The light incident surface of the micro lens in the second fly's-eye lens is arranged to be the surface protruding towards one side of the first fly's-eye lens, so that light beams entering the second fly's-eye lens are converged at the light incident surface, the width of the light beams emitted by the second fly's-eye lens is compressed, and miniaturization of the illumination system is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting, in particular to a projection device and a projection system. Background Art

[0002] Laser display technology (LDT) is an image information terminal display technology that uses lasers as light sources. Projection equipment using laser display technology, i.e., laser projection equipment, usually includes a projection light source, an illumination system, and a projection lens. Among them, the illumination system is used to process the light beam emitted by the projection light source to generate an image beam emitted to the projection lens.

[0003] With the rapid development of laser display projection technology, laser projection equipment is gradually becoming smaller. Reducing the size of the lighting system to achieve the miniaturization of laser projection equipment is an important research direction. Utility Model Content

[0004] The utility model provides a projection device and a projection system, which are used for compressing the width of an outgoing light beam of an illumination system to realize the miniaturization of the illumination system.

[0005] According to a first aspect of an embodiment of the present utility model, a projection device is provided, comprising:

[0006] A projection light source, used for emitting a projection light beam;

[0007] An illumination system, located at the light-exiting side of the projection light source, for shaping and modulating an incident projection light beam; the illumination system comprises a fly-eye lens group, and a light modulator located at the light-exiting side of the fly-eye lens group; the fly-eye lens group comprises a first fly-eye lens and a second fly-eye lens sequentially arranged along a light propagation direction, the first fly-eye lens and the second fly-eye lens each comprising a plurality of micro-lenses arranged in an array, wherein a light-entering surface of the micro-lenses in the second fly-eye lens is a surface convex toward a side of the first fly-eye lens;

[0008] The projection lens is located at the light output side of the light modulator.

[0009] In some embodiments of the present invention, the light emitting surface of the microlens in the second fly-eye lens is a plane.

[0010] In some embodiments of the present invention, the light incident surface of the microlens in the first fly-eye lens is a surface convex toward the side away from the second fly-eye lens, and the light emitting surface of the microlens in the first fly-eye lens is a plane.

[0011] In some embodiments of the present invention, the light incident surface of the microlens in the first fly-eye lens is a plane, and the light emitting surface of the microlens in the first fly-eye lens is a surface convex toward one side of the second fly-eye lens.

[0012] In some embodiments of the utility model, the first fly-eye lens and the second fly-eye lens are coaxially arranged;

[0013] The distance between the first fly-eye lens and the second fly-eye lens is 2 mm to 8 mm.

[0014] In some embodiments of the present invention, the relevant parameters of the first fly-eye lens are consistent with the relevant parameters of the second fly-eye lens, wherein the relevant parameters at least include the radius of curvature, center thickness and number of microlenses in the fly-eye lens.

[0015] In some embodiments of the present invention, the radius of curvature of the microlens is 4.7 mm to 8.5 mm.

[0016] In some embodiments of the present invention, the central thickness of the microlens along the optical axis direction is 0.5 mm to 6 mm.

[0017] In some embodiments of the present invention, the convex surface of the microlens is a spherical surface or an aspherical surface.

[0018] A second aspect of the embodiment of the utility model provides a projection system, comprising:

[0019] A projection device, wherein the projection device is the projection device described in any one of the embodiments of the first aspect above;

[0020] The projection screen is located at the light-emitting side of the projection device.

[0021] The beneficial effects of the utility model are as follows:

[0022] The embodiment of the utility model provides a projection lens and a projection system, wherein the projection device includes a projection light source, an illumination system located at the light-emitting side of the projection light source, and a projection lens located at the light-emitting side of a light modulator; wherein the illumination system includes a fly-eye lens group, and a light modulator located at the light-emitting side of the fly-eye lens group; the fly-eye lens group includes a first fly-eye lens and a second fly-eye lens sequentially arranged along the light propagation direction, wherein the first fly-eye lens and the second fly-eye lens both include a plurality of micro lenses arranged in an array, and the light-entering surface of the micro lenses in the second fly-eye lens is a surface convex to one side of the first fly-eye lens. Since the light-entering surface of the micro lenses in the second fly-eye lens is set as a surface convex to one side of the first fly-eye lens, the light beam incident on the second fly-eye lens is converged at its light-entering surface, thereby reducing the width of the light beam emitted by the second fly-eye lens, which is beneficial to the miniaturization of the illumination system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model will be briefly introduced below. Obviously, the drawings introduced below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of the structure of a projection system provided by an embodiment of the utility model;

[0025] Figure 2 A schematic diagram of the imaging principle of a projection device provided by an embodiment of the utility model;

[0026] Figure 3 A schematic diagram of the structure of a lighting system provided by an embodiment of the utility model;

[0027] Figure 4 A schematic diagram of the structure of a compound eye lens assembly provided by an embodiment of the utility model;

[0028] Figure 5 A schematic diagram of the working principle of a compound eye lens assembly provided in an embodiment of the utility model;

[0029] Figure 6 A field curvature diagram provided by an embodiment of the utility model;

[0030] Figure 7 A distortion diagram provided by an embodiment of the utility model;

[0031] Figure 8 A point diagram provided for an embodiment of the utility model;

[0032] Fig. 9 A schematic diagram of the structure of another compound eye lens assembly provided in an embodiment of the utility model;

[0033] Fig.10 A schematic diagram of the working principle of another compound eye lens assembly provided in an embodiment of the utility model;

[0034] Fig.11 Another field curvature diagram provided for an embodiment of the utility model;

[0035] Fig.12 Another distortion diagram provided by an embodiment of the utility model;

[0036] Fig.13 Another point diagram provided for an embodiment of the present utility model. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the utility model will be further described in conjunction with the drawings and examples below. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments described herein; on the contrary, these embodiments are provided to make the utility model more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and their repeated descriptions will be omitted. The words expressing position and direction described in the utility model are all explained with the drawings as examples, but changes can be made as needed, and the changes made are all included in the scope of protection of the utility model. The drawings of the utility model are only used to illustrate the relative position relationship and do not represent the true proportion.

[0038] Laser display projection technology is a technology that uses optical systems and projection space to magnify and display image information. The projection system is ultimately completed by the optical imaging system to display the image. With the continuous development of projection technology, laser projection systems have been widely used in large-screen displays, laser TVs, digital cinemas, portable projection displays and other fields due to their unique advantages. Laser projection display can display more realistic and gorgeous dynamic images on ultra-large screens, achieving visual shock effects that other display technologies cannot achieve.

[0039] In practical applications, projection systems can be divided into front projection systems and rear projection systems. Figure 1 A schematic diagram of the structure of a projection system provided in an embodiment of the utility model.

[0040] like Figure 1 As shown, the front projection system may include: a projection device 100 and a projection screen 200 .

[0041] The projection screen 200 is located on the light emitting side of the projection device 100. The audience faces the projection screen 200. The projection device 100 emits projection light, which is incident on the projection screen 200 and reflected toward the audience's position through the projection screen 200, so that the audience can view the projected image.

[0042] Figure 2 A schematic diagram of the imaging principle of a projection device provided in an embodiment of the utility model.

[0043] like Figure 2 As shown, the projection device 100 includes: a projection light source 1, an illumination system 2 and a projection lens 3. The illumination system 2 is located at the light-emitting side of the projection light source 1, and a light modulator 21 is provided in the illumination system 2. The light modulator 21 is used to modulate the incident light and then emit it, and the projection lens 3 is located at the light-emitting side of the light modulator 21.

[0044] The projection light source 1 can be a light emitting diode (LED) light source or a laser light source. LED light sources have the advantages of low power consumption, small size, and long life, and are suitable for application scenarios such as small-size projection. Laser light sources have higher brightness and better color saturation, and can optimize the display effect of the projected image.

[0045] In the embodiment of the utility model, the projection light source 1 can adopt a laser light source. The laser light source can adopt a monochromatic laser, or a laser that can emit lasers of multiple colors or multiple lasers that emit lasers of different colors. When the laser light source adopts a monochromatic laser, the laser display device also needs to be provided with a color wheel, and the color wheel is used for color conversion. The monochromatic laser cooperates with the color wheel to achieve the purpose of emitting primary color lights of different colors in a time sequence. When the laser light source adopts a laser that can emit lasers of multiple colors, it is necessary to control the laser light source to emit lasers of different colors as primary color lights in a time sequence. The use of a three-color laser light source is conducive to improving the color gamut of the projected image, has better color expression, and can accurately reproduce the input image.

[0046] The illumination system 2 is located at the light-emitting side of the projection light source 1. The illumination system 2 collimates and homogenizes the emitted light of the projection light source 1 on the one hand, and on the other hand, enables the emitted light of the projection light source 1 to be incident on the light modulator 21 at a suitable angle. The illumination system 2 may include a plurality of lenses or lens groups, compound eyes, diffusers, diffuser wheels and other components, which are not limited here.

[0047] The light modulator 21 is used to modulate the incident light to form an image. In a specific implementation, the light modulator 21 can be a transmission light modulator or a reflection light modulator. Figure 2 The light modulator 21 shown is a reflective light modulator. The light modulator 21 receives the light emitted by the projection light source 1, modulates the incident light, and reflects the modulated light. Since the light path is folded back through the reflective light modulator, the volume of the projection device can be reduced.

[0048] In the embodiment of the utility model, the light modulator 21 can be liquid crystal on silicon (English: Liquid Crystal on Silicon, referred to as: LCoS) or digital micromirror (English: Digital Micromirror Device, referred to as: DMD).

[0049] LCoS is based on semiconductor technology, which combines a complementary metal oxide semiconductor (CMOS) substrate with a glass substrate containing transparent electrodes, and then injects liquid crystal packaging. LCoS has the characteristics of high aperture ratio and high resolution of each pixel, and can form high-resolution images.

[0050] The DMD includes a large number of tiny reflectors, each of which can be driven individually to deflect. By controlling the deflection angle of the DMD, the brightness of the light incident on the projection lens 3 is controlled.

[0051] After the light modulator 21 modulates the incident light to form an image, the light is reflected toward the projection lens 3, which forms an image, thereby projecting the image to a suitable size for viewing.

[0052] In practical applications, with the rapid development of laser display projection technology, laser projection equipment is gradually becoming smaller. On the premise of ensuring the imaging effect of the projection equipment, reducing the size of the lighting system in the projection equipment to achieve the miniaturization of the projection equipment is a feasible means of miniaturizing the projection equipment.

[0053] Based on this, the embodiments of the present invention provide a projection device and a projection system, so as to achieve miniaturization of the illumination system by reducing the width of the light beam emitted by the illumination system in the projection device, thereby achieving miniaturization of the projection device.

[0054] Figure 3 A schematic diagram of the structure of an illumination system in a projection device provided in an embodiment of the utility model.

[0055] like Figure 3 As shown, the illumination system 2 in the projection device 100 provided by the embodiment of the utility model includes a fly-eye lens group 22, and a light modulator 21 located on the light-emitting side of the fly-eye lens group 22, wherein:

[0056] The fly-eye lens group 22 includes a first fly-eye lens 221 and a second fly-eye lens 222 arranged in sequence along the light propagation direction; the first fly-eye lens 221 and the second fly-eye lens 222 both include a plurality of micro lenses arranged in an array, and the light incident surface of the micro lenses in the second fly-eye lens 222 is a surface convex toward the side of the first fly-eye lens 221.

[0057] In the illumination system of the projection device provided by the embodiment of the utility model, a first fly-eye lens and a second fly-eye lens are sequentially arranged in the fly-eye lens group along the light propagation direction, and the light incident surface of the microlens in the second fly-eye lens is arranged as a surface convex to the side of the first fly-eye lens, so that the light beam incident to the second fly-eye lens is converged at its light incident surface, thereby compressing the width of the light beam emitted by the second fly-eye lens, which is conducive to the miniaturization of the illumination system.

[0058] In an embodiment of the utility model, the first fly-eye lens 221 may include 11×7 microlenses, that is, in the first fly-eye lens 221, 7 microlenses are arranged in each row and 11 microlenses are arranged in each column; the second fly-eye lens 222 may also include 11×7 microlenses, that is, in the second fly-eye lens 222, 7 microlenses are arranged in each row and 11 microlenses are arranged in each column.

[0059] It should be noted that the number of microlenses in the first fly-eye lens 221 and the second fly-eye lens 22 may also be other numbers and arranged in other arrangements. The embodiments of the utility model are only used for illustration and do not limit the specific number and specific arrangement of the microlenses.

[0060] Figure 4 This is a schematic structural diagram of a fly-eye lens assembly 22 provided in an embodiment of the utility model.

[0061] In the embodiment of the present utility model, Figure 4 As shown in (a), the light incident surface of the microlens in the first fly-eye lens 221 is a surface convex toward the side away from the second fly-eye lens 222, and the light emitting surface of the microlens in the first fly-eye lens 221 is a plane.

[0062] The light incident surface of the microlens in the second fly-eye lens 222 is a surface convex toward the first fly-eye lens 221 , and the light emitting surface of the microlens in the second fly-eye lens 222 is a plane.

[0063] In a specific implementation, the microlenses in the first fly-eye lens 221 and the second fly-eye lens 222 are both convex-planar lenses. The projection light beam in the illumination system 2 will sequentially pass through the convex surface of the microlens in the first fly-eye lens 221, the plane of the microlens in the first fly-eye lens 221, the convex surface of the microlens in the second fly-eye lens 222, and the plane of the microlens in the second fly-eye lens 222.

[0064] Since the convex surface of the microlens in the second fly-eye lens 222 is used as the light incident surface, the projection light beam is converged at the light incident surface. According to the law of refraction, the light incident surface of the microlens in the second fly-eye lens 222 refracts the projection light beam into a light beam parallel to the optical axis, and the light beam parallel to the optical axis propagates horizontally in the second fly-eye lens 222 and emerges.

[0065] Specifically, taking a certain light in the projection beam as an example, the working principle of the second fly-eye lens 222 is described in detail:

[0066] Figure 5 Based on the embodiment of the utility model provided Figure 4 Schematic diagram of the working principle of the fly-eye lens group 22 shown in (a).

[0067] like Figure 5 As shown, the distance between the first fly-eye lens 221 and the second fly-eye lens 222 is l1, and when a certain light is emitted from the first fly-eye lens 221, the angle between it and the optical axis is α1; when the light enters the light incident surface of the microlens in the second fly-eye lens 222, the distance between its incident point and the optical axis, that is, the incident height, is h1; when the light is emitted from the light exit surface of the microlens in the second fly-eye lens 222, the distance between its exit point and the optical axis, that is, the exit height, is h2.

[0068] In the second fly-eye lens 222, the radius of curvature of the microlens is R1, the center thickness of the microlens is d1, and the refractive index of the microlens is n1. When the light enters the light incident surface of the microlens in the second fly-eye lens 222, since the light incident surface is a convex surface, its incident angle is: θ1 = α1 + arcsin (h1 / R1);

[0069] According to the law of refraction, we know that: sin(θ1)=n1×sin(b1), where b1=arcsin(h1 / R1);

[0070] Therefore, the light propagates horizontally inside the second fly-eye lens 222, and its incident height h1 = the exit height h2, thereby achieving the purpose of compressing the width of the light beam.

[0071] In the embodiment of the present utility model, Figure 4 As shown in (b), the light incident surface of the microlens in the first fly-eye lens 221 is a plane, and the light emitting surface of the microlens in the first fly-eye lens 221 is a surface convex toward the second fly-eye lens 222 .

[0072] The light incident surface of the microlens in the second fly-eye lens 222 is a surface convex toward the first fly-eye lens 221 , and the light emitting surface of the microlens in the second fly-eye lens 222 is a plane.

[0073] In the specific implementation, combined with Figure 4As can be seen from (a) and (b), there are two feasible ways to set the first fly-eye lens 221, that is, the convex surface of the microlens in the first fly-eye lens 221 can be used as the light incident surface, or the plane of the microlens in the first fly-eye lens 221 can be used as the light incident surface, thereby improving the versatility of the lighting system and achieving optical anti-fouling.

[0074] In the embodiment of the present utility model, Figure 4 As shown, the first fly-eye lens 221 and the second fly-eye lens 222 are coaxially arranged; and the distance between the first fly-eye lens 221 and the second fly-eye lens 222 can be 2 mm to 8 mm.

[0075] In the embodiment of the utility model, the relevant parameters of the first fly-eye lens 221 are consistent with the relevant parameters of the second fly-eye lens 222; the relevant parameters at least include the radius of curvature, center thickness and number of microlenses in the fly-eye lens, wherein:

[0076] The curvature radius of the microlens may be 4.7 mm to 8.5 mm.

[0077] The center thickness of the microlens along the optical axis direction may be 0.5 mm to 6 mm.

[0078] The convex surface of the microlens can be spherical or aspherical.

[0079] In the embodiment of the present utility model, Figure 3 As shown, the lighting system 2 further includes a first lighting lens 23, a plane reflector 24, a second lighting lens 25, a prism 26 and a protective glass 27 which are sequentially arranged along the light propagation direction.

[0080] The prism 26 may be a total internal reflection (TIR) ​​prism or a reverse total internal reflection (RTIR) prism.

[0081] In the embodiment of the utility model, by optimizing the relevant parameters of the microlenses in the first fly-eye lens 221 and the second fly-eye lens 222, the convex surface of the microlens in the first fly-eye lens 221 or the plane of the microlens in the first fly-eye lens 221 can be used as the light incident surface; similarly, the convex surface of the microlens in the second fly-eye lens 222 or the plane of the microlens in the second fly-eye lens 222 can be used as the light incident surface (this embodiment will be introduced in the subsequent content), and no matter what setting mode the two fly-eye lenses adopt, the imaging effect meets the requirements, thereby improving the versatility of the lighting system and realizing optical anti-foolproofing.

[0082] In addition, when the convex surface of the microlens in the second fly-eye lens 222 serves as the light incident surface, each microlens in the second fly-eye lens 222 acts as a field lens in the light path, that is, it can reduce the width of the light beam. Therefore, the width of the light beam emitted by the lighting system can be reduced, which is conducive to the miniaturization of the lighting system.

[0083] Based on Figure 4 In the structure shown in (a), the surface parameters of each optical component in the fly-eye lens group 22 provided by the embodiment of the utility model and the spacing between the optical components can be shown in the following table:

[0084] Face number Face type Curvature radius (mm) Thickness(mm) Refractive Index S1 Spherical 4.7 0.5 1.52 S2 flat 0 8 S3 Spherical 4.7 0.5 1.52 S4 flat 0

[0085] Based on Figure 4 The structure of the fly-eye lens group 22 shown in (a) of the embodiment of the utility model also evaluates the image quality of the illumination system based on the above parameter optimization results.

[0086] Figure 6 A field curvature diagram provided for an embodiment of the utility model.

[0087] Figure 6 The figure shows the field curvature curves of the image formed by the light with wavelengths of 0.486μm, 0.588μm and 0.656μm in the meridian direction (T) and sagittal direction (S) under different fields of view, where the horizontal axis represents the field curvature size in millimeters, and the vertical axis represents the image height (field of view). Figure 6 It can be seen that the field curvature of the lighting system is within the range of ±0.30 mm, and the field curvature of the lighting system is within a reasonable range.

[0088] Figure 7 A distortion diagram provided for an embodiment of the present utility model.

[0089] Figure 7 The distortion curves of the images formed by light with wavelengths of 0.486μm, 0.588μm and 0.656μm within a certain field of view are shown, where the horizontal axis represents the distortion percentage and the vertical axis represents the image height (field of view). Distortion represents the degree of distortion of the image formed by the optical system on the object relative to the object itself. The thickness of the lens and its position relative to the aperture stop determine its contribution to the system distortion. Figure 7 It can be seen that the maximum distortion of the lighting system is within ±2%, and the distortion of the lighting system is within a reasonable range.

[0090] Figure 8 A point diagram provided for an embodiment of the utility model.

[0091] The spot diagram can reflect the clarity of the imaging of the lighting system. The more concentrated the points in the diagram, the less smear and better sharpness the projection lens has when imaging. Figure 8 The image spot diagram (Spot Size diagram) of light with wavelengths of 0.486μm, 0.588μm and 0.656μm in three fields of view is shown. Figure 8 It can be seen that the images formed by the lighting system in different fields of view can be within a reasonable range. The root mean square (RNS) radius and geometric (GEO) radius data corresponding to the images formed in the three fields of view simulated by the embodiment of the utility model are shown in the following table:

[0092] Field of view 1 2 3 RNS radius (μm) 10.628 31.317 31.317 GEO radius (μm) 17.433 80.441 80.441

[0093] comprehensive Figure 6 to Figure 8 It can be seen from the image quality evaluation results that the embodiment of the utility model provides Figure 4 The illumination system shown in (a) has small aberration and chromatic aberration during imaging and has good imaging quality.

[0094] Fig. 9 This is a schematic diagram of other possible structures of the fly-eye lens group 22 provided in an embodiment of the utility model.

[0095] In the embodiment of the present utility model, Fig. 9 As shown in (a), the light incident surface of the microlens in the first fly-eye lens 221 is a surface convex toward the side away from the second fly-eye lens 222, and the light emitting surface of the microlens in the first fly-eye lens 221 is a plane.

[0096] The light incident surface of the microlens in the second fly-eye lens 222 is a plane, and the light emitting surface of the microlens in the second fly-eye lens 222 is a surface convex toward the side away from the first fly-eye lens 221 .

[0097] In a specific implementation, the projection light beam in the illumination system 2 will sequentially pass through the convex surface of the microlens in the first fly-eye lens 221 , the plane of the microlens in the first fly-eye lens 221 , the plane of the microlens in the second fly-eye lens 222 , and the convex surface of the microlens in the second fly-eye lens 222 .

[0098] Since the plane of the microlens in the second fly-eye lens 222 is used as the light incident surface, and the convex surface of the microlens is used as the light exit surface, the projection light beam is still divergent when entering its light incident surface, and propagates in the second fly-eye lens 222, and the light is converged at its light exit surface, that is, the light exit surface of the microlens in the second fly-eye lens 222 refracts the divergent projection light beam into a light beam parallel to the optical axis, and emits it horizontally. Therefore, during the process of the light beam propagating in the second fly-eye lens 222, the width of the light beam increases.

[0099] Specifically, taking a certain light in the projection beam as an example, the working principle of the second fly-eye lens 222 is described in detail:

[0100] Fig.10 Based on the embodiment of the utility model provided Fig. 9 Schematic diagram of the working principle of the fly-eye lens group 22 shown in (a).

[0101] like Fig.10 As shown, the distance between the first fly-eye lens 221 and the second fly-eye lens 222 is l1, and when a certain light is emitted from the first fly-eye lens 221, the angle between it and the optical axis is α1; when the light enters the light incident surface of the microlens in the second fly-eye lens 222, the distance between its incident point and the optical axis, that is, the incident height, is h1; when the light is emitted from the light exit surface of the microlens in the second fly-eye lens 222, the distance between its exit point and the optical axis, that is, the exit height, is h3.

[0102] In the second fly-eye lens 222, the radius of curvature of the microlens is R1, the center thickness of the microlens is d1, and the refractive index of the microlens is n1. When the light enters the light incident surface of the microlens in the second fly-eye lens 222, since the light incident surface is a plane, its incident angle is: θ2 = α1;

[0103] According to the law of refraction, it can be known that: sin(θ2)=n1×sin(β1), wherein β1 is used to represent the angle between the light and the optical axis after the light is refracted at the light incident surface of the microlens in the second fly-eye lens 222;

[0104] Therefore, when the light propagates inside the second fly-eye lens 222, the distance between the light and the optical axis, that is, the width of the light beam increases by △h, which can be expressed as: △h=d1×tan(β1), and its exit height h3 is the sum of the incident height h1 and the increment △h, that is, h3=h1+△h.

[0105] exist Fig. 9 In the structure of the fly-eye lens group 22 shown in (a), the light emission height h3 = h1 + △h, and Figure 4 In the structure of the fly-eye lens group 22 shown in (a), the light emission height h2 = h1. Obviously, using the convex surface of the microlens in the second fly-eye lens 222 as the light incident surface can achieve the purpose of compressing the width of the light beam, reduce the effective diameter of the subsequent optical device, and facilitate the miniaturization of the lighting system.

[0106] In addition, combined Figure 4 (a) and Fig. 9 As can be seen from (a), there are two feasible ways to set the second fly-eye lens 222, that is, the convex surface of the microlens in the second fly-eye lens 222 can be used as the light incident surface, or the plane of the microlens in the second fly-eye lens 222 can be used as the light incident surface, thereby improving the versatility of the lighting system and achieving optical anti-fouling.

[0107] In the embodiment of the present utility model, Fig. 9 As shown in (b), the light incident surface of the microlens in the first fly-eye lens 221 is a plane, and the light exit surface of the microlens in the first fly-eye lens 221 is a surface convex toward the second fly-eye lens 222;

[0108] The light incident surface of the microlens in the second fly-eye lens 222 is a plane, and the light emitting surface of the microlens in the second fly-eye lens 222 is a surface convex toward the side away from the first fly-eye lens 221 .

[0109] Based on Fig. 9 In the structure shown in (a), the surface parameters of each optical component in the fly-eye lens group 22 provided by the embodiment of the utility model and the spacing between the optical components can be shown in the following table:

[0110] Face number Face type Curvature radius (mm) Thickness(mm) Refractive Index S1 Spherical 4.7 0.5 1.52 S2 flat 0 8 S3 flat 0 0.5 1.52 S4 Ask for a face -4.7

[0111] Based on Fig. 9 The structure of the fly-eye lens group 22 shown in (a) of the embodiment of the utility model also evaluates the image quality of the illumination system based on the above parameter optimization results.

[0112] Fig.11 A field curvature diagram provided for an embodiment of the utility model.

[0113] Fig.11 The field curvature curves of the images formed by the light rays with wavelengths of 0.486 μm, 0.588 μm and 0.656 μm in the meridian direction (T) and sagittal direction (S) under different fields of view are shown, wherein the abscissa represents the field curvature magnitude in mm, and the ordinate represents the image height (field of view), which is Fig.11 It can be seen that the field curvature of the lighting system is within the range of ±0.30 mm, and the field curvature of the lighting system is within a reasonable range.

[0114] Fig.12 A distortion diagram provided for an embodiment of the present utility model.

[0115] Fig.12 The distortion curves of the images formed by light with wavelengths of 0.486μm, 0.588μm and 0.656μm within a certain field of view are shown, where the horizontal axis represents the distortion percentage and the vertical axis represents the image height (field of view). Distortion represents the degree of distortion of the image formed by the optical system on the object relative to the object itself. The thickness of the lens and its position relative to the aperture stop determine its contribution to the system distortion. Fig.12 It can be seen that the maximum distortion of the lighting system is within ±2%, and the distortion of the lighting system is within a reasonable range.

[0116] Fig.13 A point diagram provided for an embodiment of the utility model.

[0117] The spot diagram can reflect the clarity of the imaging of the lighting system. The more concentrated the points in the diagram, the less smear and better sharpness the projection lens has when imaging. Fig.13 The image spot diagram (Spot Size diagram) of light with wavelengths of 0.486μm, 0.588μm and 0.656μm in three fields of view is shown. Fig.13 It can be seen that the images formed by the lighting system in different fields of view can be within a reasonable range. The root mean square (RNS) radius and geometric (GEO) radius data corresponding to the images formed in the three fields of view simulated by the embodiment of the utility model are shown in the following table:

[0118] Field of view 1 2 3 RNS radius (μm) 11.889 31.254 31.254 GEO radius (μm) 19.302 79.224 79.224

[0119] comprehensive Figure 11 to Figure 13 It can be seen from the image quality evaluation results that the embodiment of the utility model provides Fig. 9 The illumination system shown in (a) has small aberration and chromatic aberration during imaging and has good imaging quality.

[0120] Based on the same concept, the embodiment of the utility model also provides a projection system, such as Figure 1 As shown, the projection system may include a projection device 100 and a projection screen 200, and the projection device 100 may include the lighting system 2 provided by any of the above embodiments.

[0121] According to the first utility model concept, the lighting system includes a fly-eye lens group, and a light modulator located on the light-emitting side of the fly-eye lens group; the fly-eye lens group includes a first fly-eye lens and a second fly-eye lens arranged in sequence along the light propagation direction; the first fly-eye lens and the second fly-eye lens each include a plurality of microlenses arranged in an array, and the light incident surface of the microlens in the second fly-eye lens is a surface convex toward one side of the first fly-eye lens.

[0122] By setting the light incident surface of the microlens in the second fly-eye lens to be a surface convex toward the first fly-eye lens, the light beam incident on the second fly-eye lens is converged at its light incident surface, thereby compressing the width of the light beam emitted by the second fly-eye lens, which is conducive to the miniaturization of the lighting system.

[0123] According to the second utility model concept, the light emitting surface of the microlens in the second fly-eye lens is a plane.

[0124] According to the third utility model, the light incident surface of the microlens in the first fly-eye lens is a surface convex toward the side away from the second fly-eye lens, and the light emitting surface of the microlens in the first fly-eye lens is a plane.

[0125] According to the fourth utility model, the light incident surface of the microlens in the first fly-eye lens is a plane, and the light exit surface of the microlens in the first fly-eye lens is a surface convex to the second fly-eye lens. The plane of the microlens in the first fly-eye lens can be used as the light incident surface, and the convex surface of the microlens in the first fly-eye lens can also be used as the light incident surface, that is, there are two feasible settings for the first fly-eye lens, so as to improve the versatility of the lighting system and realize optical anti-foolproofing.

[0126] According to the fifth utility model, the first fly-eye lens and the second fly-eye lens are coaxially arranged; the distance between the first fly-eye lens and the second fly-eye lens is 2 mm to 8 mm.

[0127] According to the sixth utility model concept, the relevant parameters of the first fly-eye lens are consistent with the relevant parameters of the second fly-eye lens, wherein the relevant parameters at least include the radius of curvature, center thickness and number of microlenses in the fly-eye lens.

[0128] According to the seventh utility model, the curvature radius of the microlens is 4.7 mm to 8.5 mm. By optimizing the curvature radius of the microlens in the fly-eye lens, there are two feasible configurations for both the first fly-eye lens and the second fly-eye lens, thereby improving the versatility of the lighting system and achieving optical anti-foolproofing.

[0129] According to the eighth utility model, the center thickness of the microlens along the optical axis is 0.5 mm to 6 mm. By optimizing the center thickness of the microlens in the fly-eye lens, there are two feasible configurations for the first fly-eye lens and the second fly-eye lens, so as to improve the versatility of the lighting system and realize optical anti-foolproofing.

[0130] According to the ninth utility model, the convex surface of the microlens is a spherical surface or an aspherical surface.

[0131] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0132] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A projection device, characterized in that: include: A projection light source, used for emitting a projection light beam; An illumination system, located at the light-emitting side of the projection light source, for shaping and modulating the incident projection light beam; The illumination system comprises a fly-eye lens group, and a light modulator located at the light-emitting side of the fly-eye lens group; the fly-eye lens group comprises a first fly-eye lens and a second fly-eye lens sequentially arranged along a light propagation direction, the first fly-eye lens and the second fly-eye lens each comprise a plurality of micro lenses arranged in an array, wherein a light-entering surface of the micro lenses in the second fly-eye lens is a surface convex toward a side of the first fly-eye lens; The projection lens is located at the light output side of the light modulator.

2. The projection device according to claim 1, characterized in that: The light emitting surface of the microlens in the second fly-eye lens is a plane.

3. The projection device according to claim 2, characterized in that: The light incident surface of the microlens in the first fly-eye lens is a surface convex toward the side away from the second fly-eye lens, and the light emitting surface of the microlens in the first fly-eye lens is a plane.

4. The projection device according to claim 2, characterized in that: The light incident surface of the microlens in the first fly-eye lens is a plane, and the light emitting surface of the microlens in the first fly-eye lens is a surface convex toward the second fly-eye lens.

5. The projection device according to any one of claims 1 to 4, characterized in that: The first fly-eye lens and the second fly-eye lens are coaxially arranged; The distance between the first fly-eye lens and the second fly-eye lens is 2 mm to 8 mm.

6. The projection device according to any one of claims 1 to 4, characterized in that: The relevant parameters of the first fly-eye lens are consistent with the relevant parameters of the second fly-eye lens, wherein the relevant parameters at least include the curvature radius, center thickness and number of microlenses in the fly-eye lens.

7. The projection device according to claim 6, characterized in that: The curvature radius of the microlens is 4.7 mm to 8.5 mm.

8. The projection device according to claim 6, characterized in that: The central thickness of the microlens along the optical axis direction is 0.5 mm to 6 mm.

9. The projection device according to claim 6, characterized in that: The convex surface of the microlens is a spherical surface or an aspherical surface.

10. A projection system, characterized in that: include: A projection device, wherein the projection device is the projection device according to any one of claims 1 to 9; The projection screen is located at the light-emitting side of the projection device.

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