Projection equipment

Abstract

The utility model discloses projection equipment, which comprises a projection light source, an illumination system and a projection lens, the illumination system comprises a positioning structure, a first lens group, a second lens group, a third lens group and a light modulation part. A first positioning structure in the positioning structures is located on the side close to the projection light source, and a second positioning structure in the positioning structures is located on the side close to the light modulation component. The light modulation component is a first DMD, and the second lens group is fixed on the first positioning structure; the light modulation component is a second DMD, and the second lens group is fixed on the second positioning structure; the first DMD size is smaller than the second DMD size. When DMDs with different sizes are adopted, the second lens group is arranged on different fixing structures, so that the light spot size of the light beam emitted by the second lens group is changed, the light spot size is consistent with the size of an effective area of the DMD, compatibility of the DMDs with different sizes is realized, compatible design of the illumination system is facilitated, and the universality of the illumination system is improved.

Description

Technical Field

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

[0002] In recent years, with the development of projection display technology, the market share of laser projection display products has continued to increase, and users have increasingly higher requirements for product display size, display quality, etc. Among them, digital light processing (DLP) technology is widely used in the field of laser projection because it can achieve higher output brightness.

[0003] In projection equipment based on DLP technology, the core component is the digital micro-mirror device (DMD), which is a matrix composed of micro-mirrors arranged on a semiconductor chip, and each micro-mirror controls a pixel in the projection image. These micro-mirrors can change the deflection angle under the control of the driving signal, thereby controlling the brightness of the light reflected to the projection lens.

[0004] DMD chips have different sizes, such as 0.47 inches, 0.65 inches, etc. In practical applications, different sizes of DMDs are used in lighting systems according to different application scenarios of the projection system. For example, 0.47-inch DMD chips are mostly used in home scenarios, and 0.65-inch DMD chips are mostly used in commercial scenarios. Therefore, in current projection equipment, the lighting system architecture is independently designed according to the size of the DMD chip used. However, this will result in a large number of materials in the lighting system and an increase in material costs, which is not conducive to the optimization of the projection equipment. Utility Model Content

[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 is located at the light-emitting side of the projection light source, and is used to shape and modulate the incident projection light beam; the illumination system comprises a positioning structure, and a first lens group, a second lens group, a third lens group and a light modulation component which are sequentially arranged along the propagation direction of the light path, and the first lens group, the second lens group and the third lens group are coaxially arranged; the positioning structure comprises at least a first positioning structure and a second positioning structure, the first positioning structure is arranged on a side close to the projection light source, and the second positioning structure is arranged on a side close to the light modulation component;

[0008] The light modulation component is a first digital micromirror device, and the second lens group is fixed on the first positioning structure so that the size of the light spot emitted through the second lens group matches the size of the effective area of ​​the first digital micromirror device;

[0009] Alternatively, the light modulation component is a second digital micromirror device, and the second lens group is fixed on the second positioning structure so that the size of the light spot emitted through the second lens group matches the size of the effective area of ​​the second digital micromirror device, wherein the size of the first digital micromirror device is smaller than the size of the second digital micromirror device;

[0010] The projection lens is located at the light-emitting side of the light modulation component and is used for projecting images.

[0011] In some embodiments of the utility model, the first lens group includes a first lens; the second lens group includes a second lens and a third lens arranged in sequence along the propagation direction of the light path; the third lens group includes a fourth lens;

[0012] The first lens has positive refractive power; the second lens has negative refractive power; the third lens has positive refractive power; and the fourth lens has positive refractive power.

[0013] In some embodiments of the utility model, the first lens group includes a first lens; the second lens group includes a second lens; the third lens group includes a third lens;

[0014] The first lens has positive refractive power; the second lens has positive refractive power; and the third lens has positive refractive power.

[0015] In some embodiments of the utility model, the lighting system further includes a first reflector and a second reflector; the first reflector and the second reflector are both plane reflectors;

[0016] The first reflector is located between the first lens group and the second lens group, and the second reflector is located between the second lens group and the third lens group; the first reflector is used to reflect the light beam emitted by the first lens group to the second lens group; the second reflector is used to reflect the light beam emitted by the second lens group to the third lens group;

[0017] Alternatively, the first reflector and the second reflector are both located between the second lens group and the third lens group, and the first reflector and the second reflector are arranged sequentially along the propagation direction of the light path; the first reflector is used to reflect the light beam emitted by the second lens group to the second reflector; the second reflector is used to reflect the light beam reflected by the first reflector to the third lens group.

[0018] In some embodiments of the present invention, the lighting system further comprises:

[0019] Lighting housing;

[0020] A first fixing device, wherein a first supporting structure is disposed on the lighting housing, and the first fixing device is used to fix the first reflector on the first supporting structure; the first fixing device comprises at least two first pressing sheets, and the at least two first pressing sheets are located on different sides of the first reflector, and the first pressing sheets are used to press the first reflector toward the direction of the first supporting structure;

[0021] A second fixing device, a second supporting structure is arranged on the lighting housing, and the second fixing device is used to fix the second reflector on the second supporting structure; the second fixing device comprises at least two second pressing plates, and at least two second pressing plates are located on different sides of the second reflector, and the second pressing plate is used to press the second reflector toward the direction of the second supporting structure.

[0022] In some embodiments of the present invention, the lighting system further comprises:

[0023] a prism assembly, located between the light modulation component and the third lens group, the prism assembly being used to reflect the light beam emitted by the third lens group to the light modulation component, and transmit the light beam emitted by the light modulation component to the projection lens;

[0024] A galvanometer assembly is located on the outgoing light path of the optical modulation component. The galvanometer assembly includes a circuit board and an optical mirror surface arranged on the circuit board. The circuit board drives the optical mirror surface to flip under electromagnetic action. A set angle exists between the optical mirror surface of the galvanometer assembly and the effective area of ​​the optical modulation component.

[0025] In some embodiments of the utility model, the light modulation component is the first digital micromirror device; the galvanometer assembly is located between the prism assembly and the projection lens; there is a first set angle between the optical mirror surface of the galvanometer assembly and the effective area of ​​the first digital micromirror device;

[0026] Or; the light modulation component is the second digital micromirror device; the galvanometer assembly is located between the prism assembly and the second digital micromirror device; there is a second set angle between the optical mirror surface of the galvanometer assembly and the effective area of ​​the second digital micromirror device;

[0027] Wherein, the first set angle and the second set angle are different.

[0028] In some embodiments of the utility model, the lighting system further includes a first adjusting device, which is used to fix the light modulation component and adjust the pressure on the light modulation component, wherein: the first adjusting device includes a first board, at least two first screws and a first spring corresponding to each first screw, wherein:

[0029] The first board is used to carry the light modulation component. The first board is provided with at least two first through holes, and the lighting housing is provided with at least two first screw holes, each first through hole and each first screw hole respectively corresponds to a first screw; the first screw is threadedly connected with the first screw hole on the lighting housing through the first through hole on the first board, and the first spring is sleeved on the screw rod of the first screw and is located on the side of the first board away from the light modulation component.

[0030] In some embodiments of the present invention, the lighting system further comprises:

[0031] The first heat dissipation device is located on a side of the first adjustment device away from the light modulation component, and is used to dissipate heat for the light modulation component; the first adjustment device also includes at least two second screws and a second spring corresponding to each second screw, wherein:

[0032] At least two second through holes are also provided on the first board, at least two third through holes are provided on the surface of the first heat dissipation device close to the first board, and at least two second screw holes are also provided on the lighting housing, and each second through hole, each third through hole, and each second screw hole respectively corresponds to each second screw; the second screw passes through the third through hole on the first heat dissipation device and the second through hole on the first board in sequence, and is threadedly connected with the second screw hole on the lighting housing, and the second spring is sleeved on the screw rod of the second screw and is located on the side of the first heat dissipation device away from the first board.

[0033] In some embodiments of the present invention, the lighting system further comprises:

[0034] a light homogenizing component, located between the projection light source and the first lens group, and used for homogenizing the outgoing light beam of the projection light source and then emitting it to the first lens group; the light homogenizing component is a light guide tube, and the size of the light outlet of the light guide tube is consistent with the size of the effective area of ​​the light modulation component;

[0035] The second adjusting device is used to fix the light guide and adjust the position of the light outlet of the light guide; the second adjusting device includes at least two spring plates and at least one third screw; the at least two spring plates are respectively pressed against two adjacent outer walls of the outer shell of the light guide, and the at least one third screw passes through the lighting housing and contacts at least one of the other two adjacent outer walls of the outer shell of the light guide.

[0036] A second aspect of the embodiment of the utility model provides a projection system, comprising:

[0037] A projection device, wherein the projection device is the projection device described in any one of the embodiments of the first aspect above;

[0038] The projection screen is located at the light-emitting side of the projection device.

[0039] The technical solution provided by the embodiment of the utility model brings at least the following beneficial effects:

[0040] The projection device provided by the embodiment of the utility model comprises a projection light source for emitting a projection light beam; an illumination system is located at the light-emitting side of the projection light source, and is used for shaping and modulating the incident projection light beam; the illumination system comprises a positioning structure, and a first lens group, a second lens group, a third lens group and a light modulation component which are sequentially arranged along the propagation direction of the light path, and the first lens group, the second lens group and the third lens group are coaxially arranged; the positioning structure comprises at least a first positioning structure and a second positioning structure, the first positioning structure is arranged on a side close to the projection light source, and the second positioning structure is arranged on a side close to the light modulation component; the light modulation component is a first digital micromirror device, and the second lens group is fixed on the first positioning structure, so that the size of the light spot emitted through the second lens group matches the size of the effective area of ​​the first digital micromirror device; or the light modulation component is a second digital micromirror device, and the second lens group is fixed on the second positioning structure, so that the size of the light spot emitted through the second lens group matches the size of the effective area of ​​the second digital micromirror device, wherein the size of the first digital micromirror device is smaller than the size of the second digital micromirror device; the projection lens is located at the light-emitting side of the light modulation component, and is used for projection imaging. When the optical modulation device adopts DMDs of different sizes, the second lens group is set on different fixed structures, so as to change the spot size of the light beam emitted after passing through the first lens group, the second lens group and the third lens group in sequence, so that the spot size is consistent with the size of the effective area of ​​the DMD, thereby achieving the adaptation of DMD chips of different sizes, which is beneficial to the compatible design of the lighting system and improves the versatility of the lighting system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] 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.

[0042] Figure 1 One of the structural schematic diagrams of the projection device provided by the embodiment of the utility model;

[0043] Figure 2 One of the structural schematic diagrams of the lighting system in the projection device provided by the embodiment of the utility model;

[0044] Figure 3 A schematic diagram of the structure of the positioning structure in the lighting system provided by an embodiment of the utility model;

[0045] Figure 4 A second structural schematic diagram of the lighting system in the projection device provided by an embodiment of the utility model;

[0046] Figure 5 A schematic diagram of the disassembly of parts of a positioning structure in a lighting system provided by an embodiment of the utility model;

[0047] Figure 6 A schematic diagram of the structure of a first fixing device in a lighting system provided by an embodiment of the utility model;

[0048] Figure 7 A schematic diagram of the structure of a second fixing device in a lighting system provided by an embodiment of the utility model;

[0049] Figure 8 A schematic diagram of the structure of a light guide in a lighting system provided by an embodiment of the utility model;

[0050] Fig. 9 A schematic diagram of the disassembled structure of the parts of the second adjustment device in the lighting system provided by an embodiment of the utility model;

[0051] Fig.10 A schematic diagram of a partial structure of a second adjustment device in a lighting system provided by an embodiment of the utility model;

[0052] Fig.11 A schematic diagram of the local light path propagation of the illumination system in the projection device provided by the embodiment of the utility model;

[0053] Fig.12 One of the partial structural schematic diagrams of the lighting system in the projection device provided by the embodiment of the utility model;

[0054] Fig.13A second structural schematic diagram of a projection device provided in an embodiment of the utility model;

[0055] Fig.14 The third structural diagram of the lighting system in the projection device provided by the embodiment of the utility model;

[0056] Fig.15 A second schematic diagram of a partial structure of an illumination system in a projection device provided by an embodiment of the utility model;

[0057] Fig.16 A third structural schematic diagram of a projection device provided in an embodiment of the utility model;

[0058] Fig.17 One of the optical path schematic diagrams of the lighting system provided by the embodiment of the utility model;

[0059] Fig.18 The second schematic diagram of the light path of the lighting system provided by the embodiment of the utility model;

[0060] Fig.19 A schematic diagram of the disassembly of parts of a first adjustment device in a lighting system provided by an embodiment of the utility model;

[0061] Fig. 20 One of the schematic diagrams of partial parts disassembly of the first adjustment device in the lighting system provided by the embodiment of the utility model;

[0062] Fig.21 A second schematic diagram of the partial parts disassembly of the first adjustment device in the lighting system provided by an embodiment of the utility model;

[0063] Fig. 22 A third schematic diagram of the partial parts disassembly of the first adjustment device in the lighting system provided by an embodiment of the utility model;

[0064] Fig.23 A schematic diagram of the assembly of a first adjustment device in a lighting system provided by an embodiment of the utility model;

[0065] Fig.24 A schematic diagram of the structure of a projection system provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0066] 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.

[0067] Projection display technology is a technology that uses optical systems and projection space to magnify and display image information. With the continuous development of projection display technology, users' requirements for the display size and image quality of projection systems are increasing.

[0068] Current projection equipment is usually based on DLP technology. The projection equipment consists of a projection light source, an illumination system, and a projection lens. The DMD is the core component of the illumination system, and the projection lens is installed on the light-emitting side of the DMD. In actual applications, the light beam emitted from the projection light source is incident on the illumination system, shaped and homogenized, and then incident on the DMD. It is then modulated and reflected by the DMD and then emitted to the projection lens. The projection lens forms an image and finally projects it onto the projection screen to form a display image. Therefore, the performance of the illumination system will directly affect the imaging quality of the projection system.

[0069] Since DMD has different sizes, such as 0.47 inches, 0.65 inches, etc. In actual applications, DMDs of different sizes will be selected according to different application scenarios. Among them, 0.47-inch DMD is usually used in the field of home projection, such as home laser TV products, which are usually equipped with ultra-short-focus lenses to achieve short-focus large-screen projection display; 0.65-inch DMD is usually used in the field of commercial projection, such as projection display products in exhibition halls and museums, which are usually equipped with telephoto lenses to achieve high-brightness, large-size projection display.

[0070] Among them, on the one hand, the effective area of ​​DMD chips of different sizes is different accordingly. For example, the effective area of ​​0.47-inch DMD is 10.368mm×5.832mm, and the effective area of ​​0.65-inch DMD is 14.592mm×8.208mm. This makes the area of ​​the incident light spot and the area of ​​the exit light spot corresponding to the two sizes of DMDs quite different, and the spot area differs by about 49.5%. On the other hand, the pressure on the mechanical bearing area required by the specifications of DMD chips of different sizes is also different accordingly. For example, the pressure required by the specifications of 0.47-inch DMD chips is 245N, and the pressure required by the specifications of 0.65-inch DMD chips is 113N.

[0071] So when applying, in order for the DMD chip to work properly, on the one hand, it is necessary to ensure that the pressure on the DMD chip is within the specified range, and on the other hand, the outgoing light beam of the projection light source needs to be shaped to a size that matches the DMD and enter the DMD chip at a suitable angle. However, due to the different pressures that DMD chips of different sizes are required to withstand and the different effective area areas, the current lighting system architecture in projection equipment is not compatible with DMD chips of different sizes, and the lighting system is designed independently according to the size of the selected DMD chip. This will result in a large number of lighting materials for the lighting system, and increase material costs, reduce the versatility of the lighting system, and is not conducive to the performance optimization of the lighting system.

[0072] Based on this, an embodiment of the utility model provides a projection device, so that the lighting system can adapt to DMDs of different sizes, thereby improving the versatility of the lighting system and facilitating the performance optimization of the lighting system and the projection device.

[0073] Figure 1 This is one of the structural schematic diagrams of the projection device provided in the embodiment of the utility model.

[0074] like Figure 1 As shown, the projection device 100 includes: a projection light source 1, an illumination system 2 and a projection lens 3, wherein the projection light source 1 is used to emit a projection light beam; the illumination system 2 is located on the light-emitting side of the projection light source 1, and is used to shape and modulate the incident projection light beam; the projection lens 3 is located on the light-emitting side of the illumination system 2, and is used to project an image.

[0075] In some embodiments, the projection light source 1 can be an LED (Light Emitting Diode) 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.

[0076] In some embodiments, 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.

[0077] In some embodiments, the lighting system 2 includes a light modulation component 21. On the one hand, the lighting system 2 can collimate and homogenize the output light of the projection light source 1, and on the other hand, it can make the output light of the projection light source 1 incident on the light modulation component 21 at a suitable angle; the light modulation component 21 is used to modulate the incident light to form an image.

[0078] In specific implementation, the light modulation component 21 can be a transmissive light modulator or a reflective light modulator. The light modulation component 21 in the embodiment of the utility model is a reflective light modulator, which 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.

[0079] In a specific implementation, after the light modulation component 21 modulates the incident light to form an image, the light is reflected toward the projection lens 3, and the projection lens 3 forms an image, thereby projecting the image to a suitable size for viewing.

[0080] In the embodiment of the utility model, the light modulation component 21 can use a DMD chip. The DMD chip is a spatial light modulator composed of thousands of precise micro-mirrors. The micro-mirrors are arranged above the rotating device. The rotating device drives each micro-mirror to rotate under the control of a digital drive signal, and the angle and direction of each micro-mirror can be adjusted independently at a very fast speed. The micro-mirrors in the DMD chip can be tilted to an on or off state, and each micro-mirror can control a pixel in the projection plane, wherein the micro-mirror in the on state can reflect the light incident on its surface to the projection lens 3 for imaging.

[0081] In order to meet the requirements of DMD chips of different sizes for the incident light beam when they are working, the embodiment of the utility model sets a combination of a series of optical components on the optical path between the projection light source 1 and the light modulation component 21, which is used to direct the light spot emitted from the projection light source 1 into the effective working area on the surface of the light modulation component 21 at a set angle and a set size, so as to achieve a compatible setting of the DMD light incident side in the lighting system 2.

[0082] Figure 2 This is one of the structural schematic diagrams of the lighting system in the projection device provided in the embodiment of the utility model.

[0083] In some embodiments, Figure 2 As shown, the lighting system 2 may further include a positioning structure, and a first lens group 221, a second lens group 222 and a third lens group 223 sequentially arranged along the light propagation direction, and the first lens group 221, the second lens group 222 and the third lens group 223 are coaxially arranged.

[0084] Figure 3 A structural schematic diagram of a positioning structure in a lighting system provided in an embodiment of the utility model.

[0085] like Figure 3 As shown, the positioning structure at least includes a first positioning structure 311 and a second positioning structure 312 . The first positioning structure 311 is arranged on a side close to the projection light source 3 , and the second positioning structure 312 is arranged on a side close to the light modulation component 21 .

[0086] Reference Figure 2 and Figure 3 , the light modulation component 21 is a first digital micromirror device, and the second lens group 222 is fixed on the first positioning structure so that the size of the light spot emitted through the second lens group 222 matches the size of the effective area of ​​the first digital micromirror device; or, the light modulation component 21 is a second digital micromirror device, and the second lens group 222 is fixed on the second positioning structure so that the size of the light spot emitted through the second lens group 222 matches the size of the effective area of ​​the second digital micromirror device, wherein the size of the first digital micromirror device is smaller than the size of the second digital micromirror device.

[0087] When the optical modulation device adopts DMDs of different sizes, the second lens group is set on different fixed structures. The change of the position of the second lens group causes the spot size of the emergent light beam after passing through the first lens group, the second lens group and the third lens group in sequence to change accordingly. The spot size is consistent with the size of the effective area of ​​the DMD, so that DMD chips of different sizes can be adapted, which is beneficial to the compatible design of the lighting system and improves the versatility of the lighting system.

[0088] In some embodiments, Figure 2As shown, the first lens group 221 includes a first lens C11; the second lens group 222 includes a second lens C12 and a third lens C13 sequentially arranged along the optical path propagation direction; and the third lens group 223 includes a fourth lens C14.

[0089] In the embodiment of the utility model, at least two positioning structures are provided in the illumination system 2. When the size of the DMD chip is different, the second lens group 222 composed of the second lens C12 and the third lens C13 is installed on different positioning structures to change the position of the second lens group 222 in the optical path, so that the size of the emergent light spot after passing through the first lens group 221, the second lens group 222 and the third lens group 223 in sequence is changed to adapt to the size of the DMD and realize the zoom function. In addition, only four lenses are provided in the illumination system 2, and the optical path structure is simple, which is conducive to reducing the complexity of the projection equipment and reducing the cost.

[0090] It is worth noting that when moving the second lens group 222, the relative position relationship between the second lens C12 and the third lens C13 needs to be kept unchanged, and the second lens C12 and the third lens C13 are moved as a whole, so as to avoid problems such as defocusing of the zoom lens group.

[0091] In the embodiment of the present invention, the first lens C11, the second lens C12, the third lens C13 and the fourth lens C14 are all spherical lenses.

[0092] In some embodiments, the first lens C11 may be a concave-convex spherical lens, used to perform shaping and focusing processing on the light incident to the first lens C11. The second lens C12 may be a convex-concave spherical lens, and the third lens C13 may be a biconvex spherical lens, wherein the second lens C12 and the third lens C13 cooperate to improve the chromatic aberration and spherical aberration of the incident light. The fourth lens C14 may be a biconvex spherical lens, used to perform angle adjustment and light shaping processing on the light incident to the fourth lens C14.

[0093] In the embodiment of the present invention, the first lens element C11 has positive refractive power; the second lens element C12 has negative refractive power; the third lens element C13 has positive refractive power; and the fourth lens element C14 has positive refractive power.

[0094] In the embodiment of the utility model, in the first lens group 221, the first lens C11 satisfies:

[0095] 45<Vd1<90;

[0096] Nd1>1.75;

[0097] Wherein, Vd1 is used to characterize the Abbe number of the first lens C11, and Nd1 is used to characterize the refractive index of the first lens C11. In the embodiment of the utility model, in the second lens group 222, the second lens C12 satisfies:

[0098] 10<Vd2<35;

[0099] Nd2>1.63;

[0100] Wherein, Vd2 is used to characterize the Abbe number of the second lens C12, and Nd2 is used to characterize the refractive index of the second lens C12. In the second lens group 222, the third lens C13 satisfies:

[0101] 50<Vd3<90;

[0102] Nd3<1.63;

[0103] Wherein, Vd3 is used to characterize the Abbe number of the third lens element C13, and Nd3 is used to characterize the refractive index of the third lens element C13.

[0104] In the embodiment of the utility model, the second lens C12 is a positive lens, the third lens C13 is a negative lens, and the Abbe number of the third lens C13 is set to be greater than the Abbe number of the second lens C12, and the refractive index of the third lens C13 is less than the refractive index of the second lens C12. In the above setting method, through the combination of positive and negative lenses in the second lens group 222, spherical aberration and chromatic aberration can be compensated and corrected to improve the imaging effect of the projection device.

[0105] In the embodiment of the utility model, in the third lens group 223, the fourth lens C14 satisfies:

[0106] 50<Vd4<90;

[0107] Nd4<1.63;

[0108] Wherein, Vd4 is used to characterize the Abbe number of the fourth lens element C14, and Nd4 is used to characterize the refractive index of the fourth lens element C14.

[0109] By controlling the parameters of the first lens C11, the second lens C12, the third lens C13 and the fourth lens C14 to meet the above ranges, and by changing the position of the second lens group 222 composed of the second lens C12 and the third lens C13 along the optical axis, the purpose of adjusting the spot size can be achieved, so that the architecture of the lighting system 2 can be adapted to DMDs of different sizes, which is beneficial to the compatible design of the lighting system.

[0110] Figure 4 The second structural schematic diagram of the lighting system in the projection device provided in the embodiment of the utility model.

[0111] In some embodiments, Figure 4 As shown, the first lens group 221 includes a first lens C21; the second lens group 222 includes a second lens C22; and the third lens group 223 includes a third lens C23.

[0112] In the embodiment of the utility model, only three lenses are arranged in the illumination system 2. By changing the fixed position of the second lens C22 along the optical axis direction, the size of the emergent light spot after passing through the first lens group 221, the second lens group 222 and the third lens group 223 in sequence can be changed to adapt to the size of the DMD and realize the zoom function. In addition, the optical path structure in the illumination system 2 is simple, which is conducive to reducing the complexity of the projection equipment and reducing the cost.

[0113] In some embodiments, the first lens C21, the second lens C22 and the third lens C23 are all spherical lenses.

[0114] In a specific implementation, the first lens C21 can be a concave-convex spherical lens, the second lens C22 can be a concave-convex spherical lens, and the third lens C23 can be a convex-concave spherical lens. The three lenses are used to adjust the angle of the incident light beam and perform shaping and convergence processing so that the size of the emitted light spot matches the size of the DMD, thereby improving the versatility of the lighting system.

[0115] It should be noted that the embodiments of the present invention only illustrate the lens shapes of the first lens, the second lens and the third lens. According to actual needs, the first lens, the second lens and the third lens can also be set to other feasible lens shapes, and the embodiments of the present invention do not impose any restrictions on this.

[0116] In some embodiments, the first lens C21 has positive refractive power; the second lens C22 has positive refractive power; and the third lens C23 has positive refractive power.

[0117] In a specific implementation, in the first lens group 221, the Abbe number of the first lens C21 may be 1.83, and the refractive index of the first lens C21 may be 42.7. In the second lens group 222, the Abbe number of the second lens C22 may be 1.80, and the refractive index of the second lens C22 may be 46.6. In the third lens group 222, the Abbe number of the third lens C23 may be 1.83, and the refractive index of the third lens C23 may be 42.7.

[0118] By controlling the parameters of the first lens C21, the second lens C22 and the third lens C23 to meet the above requirements, and by changing the position of the second lens C22 along the optical axis, the purpose of adjusting the spot size can be achieved, so that the architecture of the lighting system 2 can be adapted to DMDs of different sizes, which is beneficial to the compatible design of the lighting system.

[0119] It should be noted that the embodiments of the present invention only illustrate the parameters of the first lens, the second lens and the third lens. According to actual needs, the parameters of the first lens, the second lens and the third lens can also be set to other feasible parameters, and the embodiments of the present invention do not impose any limitation on this.

[0120] In a specific implementation, no matter which structure the illumination system 2 adopts, the F number of the illumination system 2 is set to 2.3-2.5 to ensure the imaging effect of the illumination system 2 .

[0121] In the embodiment of the utility model, in order to fix the three lens groups included in the lighting system 2 (i.e., the first lens group 221, the second lens group 222 and the third lens group 223), a plurality of positioning structures are provided in the lighting system 2 for fixing the corresponding lens groups on the lighting housing 27 of the lighting system 2.

[0122] Figure 5 A schematic diagram of the disassembly of parts of a positioning structure in a lighting system provided in an embodiment of the utility model.

[0123] Reference Figure 3 and Figure 5 , four positioning structures are provided in the lighting system 2, namely, a first positioning structure 311, a second positioning structure 312, a third positioning structure 313 and a fourth positioning structure 314, wherein the third positioning structure 313 is used to fix the first lens group 221; the fourth positioning structure 314 is used to fix the third lens group 223; when the light modulation component 21 adopts a small-sized DMD, such as a 0.23-0.47-inch DMD, the second lens group 222 is installed on the first positioning structure 311; when the light modulation component 21 adopts a small-sized DMD, such as a 0.65-0.98-inch DMD, the second lens group 222 is installed on the second positioning structure 312.

[0124] In a specific implementation, a positioning structure may include a group of mirror grooves and a group of pressing springs, a lens group is installed in a corresponding group of mirror grooves, and the pressing springs press the lens group in the direction of the group of mirror grooves to achieve the fixation of the lens group. Of course, the positioning structure may also adopt other mechanical structures that can fix the lens, and the embodiment of the utility model does not impose any limitation on this.

[0125] Taking the fourth positioning structure 314 as an example, Figure 5 As shown, the fourth positioning structure 314 includes a lens groove U1 and a pressing spring piece P1, the third lens group 223 is installed in the lens groove U1, and the pressing spring piece P1 is used to press and fix the third lens group 223. Taking the third positioning structure 313 as an example, Figure 5As shown, the third positioning structure 313 includes a lens groove U2 and a pressing spring piece P2, the first lens group 221 is installed in the lens groove U2, and the pressing spring piece P2 is used to press and fix the first lens group 221. Taking the second lens group 222 fixed on the first positioning structure 311 as an example, refer to Figure 4 and Figure 5 The first positioning structure 311 includes a mirror groove U3 and a pressing spring piece P3, and the second lens group 222 is installed in the mirror groove U3, and the pressing spring piece P3 is used to press and fix the second lens group 222. In addition, in practical applications, the first lens group 221 and the second lens group 222 can be formed by a slider, and the third lens group 223 can be formed by a public mold.

[0126] In some embodiments, Figure 2 and Figure 4 As shown, the lighting system 2 may further include a first reflector R1 and a second reflector R2. The first reflector R1 and the second reflector R2 may both be plane reflectors, which are only used to turn the propagation direction of light and do not participate in optical imaging, thereby making the optical design process simpler.

[0127] In some embodiments, Figure 2 As shown, the first reflector R11 is located between the first lens group 221 and the second lens group 222, and the second reflector R12 is located between the second lens group 222 and the third lens group 223, wherein the first lens C11, the second lens C12, the third lens C13, the fourth lens C14, the first reflector R1 and the second reflector R2 are coaxially arranged.

[0128] The first reflector R1 is used to redirect the light beam emitted from the first lens group 221 to be incident on the second lens group 222, and the second reflector R2 is used to redirect the light beam emitted from the second lens group 222 to be incident on the third lens group 223. Through the reflection effect of the two reflectors, the light path in the lighting system can be folded, which is conducive to reducing the volume of the lighting system. In specific implementation, other reflectors can be set between the lenses in the lighting system according to the use requirements to fold the lighting light path, which is not limited here.

[0129] In some embodiments, Figure 4 As shown, the first reflector R1 and the second reflector R2 are both located between the second lens group 222 and the third lens group 223, and the first reflector R1 and the second reflector R2 are sequentially arranged along the propagation direction of the light path; wherein, the first lens C21, the second lens C22, the third lens C23, the first reflector R1 and the second reflector R2 are coaxially arranged.

[0130] In a specific implementation, the first reflector R1 is used to redirect the light beam emitted from the second lens group 222 to be incident on the second reflector R12, and the second reflector R2 is used to redirect the light beam emitted from the first reflector R11 to be incident on the third lens group 223, thereby folding the light path in the lighting system, which is beneficial to reducing the volume of the lighting system.

[0131] It should be noted that the embodiment of the utility model only illustrates the positions of the first reflector and the second reflector. According to actual needs, the positions of the first reflector and the second reflector can also be set at other positions, and the number of reflectors can also be reduced or increased. The embodiment of the utility model does not impose any restrictions on this.

[0132] In the embodiment of the utility model, in order to fix the first reflector R1 and the second reflector R2, a first fixing device and a second fixing device are further provided in the lighting system 2 to ensure the installation stability of the first reflector R1 and the second reflector R2 and improve the overall stability of the projection device.

[0133] Figure 6 A schematic diagram of the structure of a first fixing device in a lighting system provided in an embodiment of the utility model.

[0134] In some embodiments, Figure 6 As shown, a first support structure is provided on the lighting housing 27, and the first support structure may be a slope structure; the first fixing device is used to fix the first reflector R1 on the first support structure. The first fixing device includes at least two first pressing plates 321, and the at least two first pressing plates 321 are located on different sides of the first reflector R1, and the first pressing plates 321 are used to press the first reflector R1 toward the direction of the first support structure.

[0135] In the specific implementation, Figure 6 As shown, the first fixing device may include two first pressing sheets 321 and screws 322 corresponding to the first pressing sheets 321, and the two first pressing sheets 321 are respectively located on both sides of the first reflector R1; a through hole is provided on the first pressing sheet 321, and a screw hole corresponding to the through hole is provided on the lighting housing 27, and the screw 322 passes through the through hole on the first pressing sheet 321 and is threadedly connected with the screw hole on the lighting housing 27. The first reflector R1 is pressed onto the first supporting structure through the first pressing sheets 321 located on both sides of the first reflector R1, and the first pressing sheet 321 is fixed to the lighting housing 27 through the screws 322, thereby achieving a stable arrangement of the first reflector R1.

[0136] Figure 7 A schematic diagram of the structure of a second fixing device in a lighting system provided in an embodiment of the utility model.

[0137] In some embodiments, Figure 7As shown, a second support structure (not shown in the figure) is provided on the lighting housing 27, and the second support structure can also be a slope structure; the second fixing device is used to fix the second reflector R2 on the second support structure. The second fixing device includes at least two second pressing plates 331, and the at least two second pressing plates 331 are located on different sides of the second reflector R2, and the second pressing plates 331 are used to press the second reflector R2 toward the direction of the second support structure.

[0138] In the specific implementation, Figure 7 As shown, the second fixing device may include two second pressing sheets 331 and screws 332 corresponding to the second pressing sheets 331, and the two second pressing sheets 331 are respectively located on both sides of the second reflector R2; a through hole is provided on the second pressing sheet 331, and a screw hole corresponding to the through hole is provided on the lighting housing 27, and the screw 332 passes through the through hole on the second pressing sheet 331 and is threadedly connected with the screw hole on the lighting housing 27. The second reflector R2 is pressed onto the second supporting structure through the second pressing sheets 331 located on both sides of the second reflector R2, and the second pressing sheet 331 is fixed to the lighting housing 27 through the screws 332, thereby achieving a stable arrangement of the second reflector R2.

[0139] Furthermore, if Figure 2 and Figure 4 As shown, the illumination system 2 may further include a light homogenizing component 23, wherein the light homogenizing component 23 is located between the projection light source 1 and the first lens group 221, and is used to shape and homogenize the projection light beam emitted by the projection light source 1, and emit the shaped and homogenized light beam to the first lens group 221. Specifically, the light homogenizing component 23 may be an optical device such as a light guide or a fly-eye lens.

[0140] In the embodiment of the utility model, the light uniforming component 23 is a light pipe Y, and the size of the light outlet of the light pipe Y is consistent with the size of the effective area of ​​the light modulation component 21.

[0141] Figure 8 It is a schematic diagram of the structure of the light guide in the lighting system in the embodiment of the utility model.

[0142] In the specific implementation, Figure 8 As shown, the light guide Y can be a hollow light guide, which is in the shape of a hollow square rod. The inner wall of the light guide Y is coated with a high reflectivity coating. When the light beam enters the light guide Y, it will undergo multiple reflections, and finally form a superposition effect of multiple light beams at the light outlet of the light guide Y to achieve light beam homogenization.

[0143] By setting the size of the light outlet of the optical waveguide Y to be consistent with the size of the effective area of ​​the optical modulation component 21, the size of the light spot emitted by the optical waveguide Y can be precisely matched with the size of the effective area of ​​the DMD to meet the incident requirements of the DMD, making it easier for the projection lens to image the DMD and improving the quality of the projected display image.

[0144] In the embodiment of the utility model, in order to ensure that the light spot emitted by the light guide Y can accurately enter the effective area of ​​the DMD, a second adjustment device is further provided in the lighting system 2.

[0145] Fig. 9 A schematic diagram of the disassembled structure of the parts of the second adjustment device in the lighting system provided by the embodiment of the utility model, Fig.10 A schematic diagram of the partial structure of the second adjustment device in the lighting system provided in an embodiment of the utility model.

[0146] In some embodiments, reference Fig. 9 and Fig.10 The second adjustment device provided in the lighting system 2 is used to fix the light guide Y and adjust the position of the light outlet Y1 of the light guide Y.

[0147] Reference Fig. 9 and Fig.10 The second adjustment device includes at least two spring plates 341 and at least one third screw 342; the at least two spring plates 341 respectively abut against two adjacent outer walls of the outer shell of the light guide Y, and the at least one third screw 342 passes through the lighting housing 27 and contacts at least one of the other two adjacent outer walls of the outer shell of the light guide Y.

[0148] In some embodiments, at least one third screw 342 is disposed at a position close to the light outlet Y1 of the light guide Y; and at least two spring pieces 341 are disposed at a position close to the light entrance of the light guide Y.

[0149] In the specific implementation, refer to Fig. 9 , taking a spring sheet 341 as an example, three through holes K4 are arranged on the spring sheet 341, and an adjustment column M1 and four screw holes H3 are formed on the lighting housing 27, and the adjustment column M1 passes through a through hole K4 located in the middle of the spring sheet 341; the second adjustment device also includes four screws 343, two of which pass through the remaining two through holes K4 on the spring sheet 341 and are threadedly connected with the corresponding two screw holes H3 on the lighting housing 27, thereby fixing the light guide Y. In actual application, by rotating the screws 343, the spring sheet 341 can move up and down along the adjustment column M1 to adjust the tightness of the spring sheet 341, thereby adapting to light guides Y of different sizes.

[0150] In the specific implementation, Fig.10As shown, the light guide Y includes four side walls, namely a first side wall S1, a second side wall S2, a third side wall S3 (not shown in the figure) and a fourth side wall S4. The first side wall S1 and the third side wall S3 are arranged opposite to each other, and the second side wall S2 and the fourth side wall S4 are arranged opposite to each other. The first side wall S1 is perpendicular to the second side wall S2 and the fourth side wall S4, respectively, and the third side wall S3 is also perpendicular to the second side wall S2 and the fourth side wall S4, respectively.

[0151] Combination Fig. 9 and Fig.10 It can be seen that the second adjustment device may include two spring plates 341 and two third screws 342. The two spring plates 341 respectively abut against the first side wall S1 and the second side wall S2 of the light guide Y. The light guide Y is fixed on the lighting housing 27 by squeezing the light guide Y by the two spring plates 341.

[0152] In addition, two third screws 342 pass through the shell wall of the lighting housing 27 respectively and abut against the third side wall S3 and the fourth side wall S4 of the light guide Y. By rotating the third screws 342, the light guide Y can be moved along the first direction X1 and the second direction X2. The first direction X1 is the direction from the fourth side wall S4 of the light guide Y to the second side wall S2, and the second direction X2 is the direction from the third side wall S3 of the light guide Y to the first side wall S1, and the first direction X1 and the second direction X2 are perpendicular. In the above manner, the purpose of adjusting the light outlet position of the light guide Y can be achieved.

[0153] The spot size of the light beam incident on the DMD can be adjusted through the above optical path structure and mechanical structure to achieve structural compatibility of the light incident side of DMDs of different sizes.

[0154] In addition, since the light spot areas emitted by DMDs of different sizes are also different, a prism assembly and a galvanometer assembly are also provided in the lighting system 2 in the embodiment of the utility model to adapt to the light spots of different sizes emitted by DMDs of different sizes, thereby achieving a compatible setting of the DMD light-emitting side in the lighting system 2.

[0155] In some embodiments, Figure 2 As shown, the lighting system 2 may further include: a prism assembly 24 and a galvanometer assembly 25 .

[0156] The prism assembly 24 is located between the light modulation component 21 and the third lens group 223 , and is used to reflect the light beam emitted from the third lens group 223 to the light modulation component 22 , and transmit the light beam emitted from the light modulation component 21 to the projection lens 3 .

[0157] In a specific implementation, the prism assembly 24 may be composed of two total reflection prisms, and the inclined surfaces of the two total reflection prisms are glued to each other.

[0158] Fig.11 A schematic diagram of local light path propagation of an illumination system in a projection device provided in an embodiment of the utility model.

[0159] like Fig.11 As described, the galvanometer assembly 25 is located on the outgoing light path of the light modulation component 21; the galvanometer assembly 25 includes a circuit board and an optical mirror surface arranged on the circuit board, and the circuit board drives the optical mirror surface to flip under electromagnetic action; there is a set angle between the optical mirror surface of the galvanometer assembly 25 and the effective area of ​​the light modulation component 21.

[0160] In a specific implementation, the galvanometer assembly 25 drives the optical mirror to flip under electromagnetic action through a circuit board to change the direction of the incident light beam and realize the staggered projection of the image light beam output by the light modulation component 21, so that the lighting system can achieve higher resolution display.

[0161] Fig.12 This is one of the partial structural schematic diagrams of the lighting system in the projection device provided in the embodiment of the utility model.

[0162] In some embodiments, reference Figure 2 and Fig.12 The light modulation component 21 adopts DMD, and the size of DMD is 0.65 to 0.98 inches; the galvanometer component 25 is located between the prism component 23 and the DMD ( Figure 2 There is a second set angle between the optical mirror surface of the galvanometer assembly 25 and the effective area of ​​the DMD.

[0163] In a specific implementation, taking the light modulation component 21 as an example, a 0.65-inch DMD is used. Figure 6 It can be clearly seen that the effective area of ​​the DMD is arranged parallel to the optical mirror surface of the galvanometer assembly 25 , that is, the second set angle can be 0°.

[0164] In practical applications, since the light modulation component 21 adopts a 0.65-0.98-inch DMD, the size of the DMD chip is relatively large, which will make the light spot area emitted by the DMD larger, and the optical mirror surface in the galvanometer assembly 25 is also correspondingly larger to ensure that the DMD output light beam can be almost completely incident on the optical mirror surface of the galvanometer assembly 25 to ensure the imaging effect.

[0165] Fig.13 The second structural schematic diagram of the projection device provided in the embodiment of the utility model.

[0166] Further, such as Fig.13 As shown, the illumination system 2 may further include an axis-shift assembly 26, which is located between the prism assembly 24 and the projection lens 3 and is used to perform off-axis adjustment on the projection lens 3 to ensure the clarity and color reproduction of the projection image when the projection device is installed in different positions.

[0167] In some embodiments, the light modulation component 21 may also use a DMD of 0.23 to 0.47 inches.

[0168] The smaller size of the DMD chip will result in a smaller light spot area emitted by the DMD, and the optical mirror surface in the galvanometer assembly 25 will also be smaller accordingly. However, a smaller light spot will concentrate the energy of the light beam. When the light beam is incident on the optical mirror surface of the galvanometer assembly 25, the energy of the light beam will be converted into heat, resulting in a higher temperature of the galvanometer assembly 25, which will cause the galvanometer assembly 25 to not work at high temperatures. More seriously, the circuit board of the galvanometer assembly 25, the part close to the optical mirror surface may even experience high-temperature ablation, causing damage and reducing the service life of the projection device. To this end, the position relationship of the galvanometer assembly 25 in the embodiment of the utility model is set as follows:

[0169] Fig.14 The third structural diagram of the lighting system in the projection device provided by the embodiment of the utility model is as follows: Fig.15 The second schematic diagram of the partial structure of the lighting system in the projection device provided by the embodiment of the utility model is as follows: Fig.16 The third structural schematic diagram of the projection device provided in the embodiment of the utility model.

[0170] In some embodiments, reference Figure 14 to Figure 16 As shown, the size of the DMD is 0.23 to 0.47 inches; the galvanometer assembly 25 is located at the prism assembly 24 is located at the DMD ( Fig.14 There is a first set angle between the optical mirror surface of the galvanometer assembly 25 and the effective area of ​​the DMD; wherein the first set angle is different from the second set angle.

[0171] Reference Fig.11 It can be seen that due to the inconsistency in the sizes of the two prisms glued together in the prism assembly 24, the prism assembly 24 has a convex structure (i.e. Fig.11 The portion marked by the dotted box in the middle), and the galvanometer assembly 25 is set on the outgoing light path of the prism assembly 24. If the optical mirror surface of the galvanometer assembly 25 is still set parallel to the effective area of ​​the DMD, the raised structure will cause the back focus of the projection lens 3 to become larger, which is not conducive to the miniaturization of the projection equipment.

[0172] Therefore, refer to Fig.11 , Fig.15 and Fig.16 By making the optical mirror surface of the galvanometer assembly 25 and the effective area of ​​the DMD form a first set angle, the influence of the protruding structure of the prism assembly 24 on the back focus is eliminated, and the back focus of the projection lens is optimized, which is conducive to the miniaturization design of the projection device. Specifically, the first set angle can be 45°.

[0173] By setting different positions for the galvanometer assembly and setting different set angles between the optical mirror surface of the galvanometer assembly and the effective area of ​​the light modulation component, the light spots emitted by the light modulation components of different sizes can be adapted to achieve a compatible design of the DMD light-emitting side in the illumination system, so that the projection device can be compatible with projection lenses of various projection ratios, thereby achieving maximum compatibility with the projection lenses.

[0174] Fig.17 This is one of the light path schematic diagrams of the lighting system provided in the embodiment of the utility model.

[0175] Reference Fig.17 , based on Figure 2 The light path propagation process of the lighting system 2 shown is as follows: the light emitted from the light homogenizing component 23 is incident on the first reflector R1 through the first lens C11, is reflected by the first reflector R1 and is incident on the second lens C12, and is successively transmitted to the second reflector R2 through the second lens C12 and the third lens C13, is reflected by the second reflector R2 and is incident on the fourth lens C14, and is emitted from the fourth lens C14 through the prism assembly 24 at a set angle and through the galvanometer assembly 25 to the light modulation component 21, and is modulated by the light modulation component 21 and then emitted through the galvanometer assembly 25 and the prism assembly 24 to subsequent optical components.

[0176] in, Figure 2 The surface parameters of each optical component in the optical path of the illumination system shown are shown in Table 1:

[0177]

[0178] Table 1

[0179] Among them, OBJ is the object plane, and S1 to S10 are the surfaces of various optical components that are passed in sequence along the propagation direction of the light path.

[0180] As can be seen from Table 1, when the light modulation component 21 adopts a 0.65-inch DMD, the thickness of S3 in the illumination system 2 is set to 12.36, and the thickness of S8 is set to 23. At this time, the size of the light spot emitted by the third lens group 223 matches the 0.65-inch DMD. When the light modulation component 21 adopts a 0.47-inch DMD, the thickness of S3 in the illumination system 2 is set to 11, and the thickness of S8 is set to 25. At this time, the size of the light spot emitted by the third lens group 223 matches the 0.47-inch DMD. Therefore, by moving the second lens group 212 along the optical axis, the illumination system 2 can be adapted to DMDs of different sizes, providing the versatility of the illumination system 2.

[0181] Fig.18 The second optical path schematic diagram of the lighting system provided in the embodiment of the utility model.

[0182] Reference Fig.18 , based on Figure 4 The light path propagation process of the lighting system 2 shown is as follows: the light emitted from the light homogenizing component 23 is incident on the first reflector R1 through the first lens C21 and the second lens C22, is reflected by the first reflector R1 and then is incident on the second reflector R2, is reflected by the second reflector R2 and then is incident on the third lens C23, is emitted from the third lens C23 and then is incident on the light modulation component 21 at a set angle through the prism assembly 24, is modulated by the light modulation component 21 and then is emitted through the prism assembly 24 to the subsequent optical components.

[0183] in, Figure 3 The surface parameters of each optical component in the optical path of the illumination system shown are shown in Table 2:

[0184]

[0185] Table 2

[0186] Among them, OBJ is the object plane, and S1 to S8 are the surfaces of various optical components that are passed in sequence along the propagation direction of the light path.

[0187] It can be seen from Table 2 that when the light modulation component 21 adopts a 0.65-inch DMD, the thickness of S2 in the illumination system 2 is set to 19.5, and the thickness of S6 is set to 16. At this time, the size of the light spot emitted by the third lens group 223 matches the 0.65-inch DMD. When the light modulation component 21 adopts a 0.47-inch DMD, the thickness of S2 in the illumination system 2 is set to 22.2, and the thickness of S6 is set to 21.2648. At this time, the size of the light spot emitted by the third lens group 223 matches the 0.47-inch DMD. Therefore, by adjusting the position of the second lens C22 along the optical axis, the illumination system 2 can be compatible with DMDs of different sizes, thereby improving the versatility of the illumination system.

[0188] Furthermore, in actual applications, the pressure on the mechanical supporting area required by the specifications of DMD chips of different sizes is also different. In order to ensure the normal operation of DMDs of different sizes, the pressure on DMD chips of corresponding sizes is required to be within a specified range. Therefore, the embodiment of the utility model also provides a first adjustment device in the lighting system 2.

[0189] Fig.19 A schematic diagram of the disassembled parts of the first adjustment device in the lighting system provided in an embodiment of the utility model.

[0190] In some embodiments, Fig.19As shown, the lighting system 2 may further include a first adjusting device; the light modulation component 21 is installed in the lighting housing 27; the first adjusting device is used to fix the light modulation component 21 and adjust the pressure on the light modulation component 21.

[0191] Fig. 20 This is one of the partial parts disassembled schematic diagrams of the first adjustment device in the lighting system provided by the embodiment of the utility model, Fig.21 The second schematic diagram of the partial parts disassembly of the first adjustment device in the lighting system provided by the embodiment of the utility model, Fig. 22 The third schematic diagram of the partial parts disassembly of the first adjustment device in the lighting system provided in the embodiment of the utility model.

[0192] Among them, refer to Figure 19 to Figure 22 The first adjustment device includes a first plate 281, at least two first screws 282 and a first spring 283 corresponding to each first screw 282; the first plate 281 is used to carry the light modulation component 21, at least two first through holes K1 are provided on the first plate 281, and at least two first screw holes H1 are provided on the lighting housing 27, and each first through hole K1 and each first screw hole H1 respectively corresponds to each first screw 282 one by one; the first screw 282 is threadedly connected with the first screw hole H1 on the lighting housing 27 through the first through hole K1 on the first plate 281, and the first spring 283 is sleeved on the screw rod of the first screw 282 and is located on the side of the first plate 281 away from the light modulation component 21.

[0193] Therefore, by adjusting the compression amount of the first spring 283 mounted on each first screw 282, the pressure on the optical modulation component 21 can be changed to meet the force required by the DMD chip specifications, ensuring stable support and normal operation of the DMD.

[0194] Reference Figure 20 to Figure 22 It can be seen that in the embodiment of the utility model, the first adjusting device may include 4 first screws 282 and 4 first springs 283, and each first spring 283 is sleeved on the screw rod of the corresponding first screw 282. Correspondingly, the first plate card 281 is also provided with 4 first through holes K1, and the 4 first through holes K1 are respectively distributed at the four top corners of the rectangular first plate card 281; the lighting housing 27 is also provided with 4 first screw holes H1, and each first screw 282 passes through the corresponding first through hole K1 and is threadedly connected with the corresponding first screw hole H1.

[0195] In a specific implementation, by rotating the first screw 282, the compression amount of the first spring 283 mounted on the first screw 282 can be changed. When the compression amount of the first spring 283 increases, the pressure on the light modulation component 21 can be increased accordingly. When the compression amount of the first spring 283 decreases, the pressure on the light modulation component 21 can be decreased accordingly, so as to achieve the purpose of adjusting the pressure on the light modulation component 21, thereby meeting the specification requirements of DMD chips of different sizes, being beneficial to the compatible design of the lighting system, and improving the versatility of the lighting system.

[0196] In addition, by setting the four first through holes K1 at the four vertices of the rectangular first board 281, the four first screws 282 after threaded connection are ensured to be centrally symmetrical with the effective area of ​​the DMD, ensuring uniform force on the DMD chip, so as to achieve stable support of the DMD.

[0197] In practical applications, since the DMD generates heat in a working state, in order to ensure the normal operation of the DMD and avoid damage to the DMD due to overheating of the device, a first heat dissipation device is further provided in the lighting system in the implementation of the utility model.

[0198] In some embodiments, Fig.19 As shown, the lighting system 2 further includes a first heat dissipation device 29 ; the first heat dissipation device 29 is located on a side of the first adjustment device away from the light modulation component 21 , and is used to dissipate heat for the light modulation component 21 .

[0199] In a specific implementation, the first heat sink 29 can be fixed on a side close to the illumination housing 27 and close to the light modulation component 21, so that the liquid cooling pipe of the first heat sink 29 is shorter, which can not only effectively ensure the heat dissipation effect, but also reduce the system cost. In practical applications, the first heat sink 29 can dissipate heat when the DMD is working, ensure the stability and efficiency of the projection device when it is working, and can prevent the projection device from being damaged due to excessive temperature, thereby extending its working life.

[0200] Because, in order to ensure the stable connection of the first heat sink 29 , the first adjustment device also includes related components for fixing the first heat sink 29 .

[0201] In some embodiments, Fig.19As shown, the first adjusting device may further include at least two second screws 284 and second springs 285 corresponding to each second screw 284; at least two second through holes K2 are also provided on the first plate 281, at least two third through holes K3 are provided on the first heat dissipation device 29, and at least two second screw holes H2 are also provided on the lighting housing 27, and each second through hole K2, each third through hole K3, and each second screw hole H2 corresponds one by one to each second screw 284 respectively; the second screw 284 passes through the third through hole k3 on the first heat dissipation device 29 and the second through hole k2 on the first plate 281 in sequence, and is threadedly connected with the second screw hole H2 on the lighting housing 27, and the second spring 285 is sleeved on the screw of the second screw 284, and is located on the side of the first heat dissipation device 29 away from the first plate 281.

[0202] Fig.23 This is a schematic diagram of the assembly of the first adjustment device in the lighting system provided in an embodiment of the utility model.

[0203] Reference Fig.19 and Fig.23 It can be seen that in the embodiment of the utility model, the first adjusting device can also include 4 second screws 284 and 4 second springs 285, and each second spring 285 is sleeved on the screw rod of the corresponding second screw 284; accordingly, the first plate card 281 is also provided with 4 second through holes K2, and the 4 second through holes K2 are respectively distributed at the four vertex corners of the rectangular first plate card 281, and are located on the periphery of the first through hole K1; four third through holes K3 are correspondingly provided on the surface of the first heat dissipation device 29 on one side close to the first plate card 281, and four second screw holes H2 are also provided on the lighting housing 27, and each second screw 284 passes through the corresponding third through hole K3 and the second through hole K2 in turn, and is threadedly connected with the corresponding second screw hole H2.

[0204] In a specific implementation, by rotating the second screw 284, the compression amount of the second spring 285 mounted on the second screw 284 can be changed. The compression amount of the second spring 285 will directly affect the force applied to the first board 281, thereby affecting the pressure applied to the DMD, thereby achieving the purpose of adjusting the pressure applied to the DMD so that it can match the specification requirements of DMD chips of different sizes.

[0205] In addition, since the four second through holes K2 are respectively arranged at the four vertices of the rectangular first board card 281, the four second screws 284 after threaded connection are ensured to be centrally symmetrical with the effective area of ​​the DMD, thereby ensuring the stable fixation of the first heat sink 29.

[0206] In summary, through the above optical path setting and structural setting, the lighting system architecture can be compatible with DMD chips of different sizes, thereby improving the versatility of the lighting system.

[0207] Based on the same utility model concept, the utility model embodiment also provides a projection system, such as Fig.24 As shown, the projection system may include a projection device 100 and a projection screen 200. The projection device 200 may include the projection device provided by any of the above embodiments.

[0208] According to the first utility model concept, the projection device includes a projection light source, an illumination system and a projection lens; the illumination system includes a positioning structure, and a first lens group, a second lens group, a third lens group and a light modulation component which are sequentially arranged along the propagation direction of the light path, and the first lens group, the second lens group and the third lens group are coaxially arranged; the positioning structure includes at least a first positioning structure and a second positioning structure, the first positioning structure is arranged on a side close to the projection light source, and the second positioning structure is arranged on a side close to the light modulation component; the light modulation component is a first digital micromirror device, and the second lens group is fixed on the first positioning structure so that the size of the light spot emitted through the second lens group matches the size of the effective area of ​​the first digital micromirror device; or, the light modulation component is a second digital micromirror device, and the second lens group is fixed on the second positioning structure so that the size of the light spot emitted through the second lens group matches the size of the effective area of ​​the second digital micromirror device, wherein the size of the first digital micromirror device is smaller than the size of the second digital micromirror device.

[0209] When the optical modulation device adopts DMDs of different sizes, the second lens group is set on different fixed structures, so as to change the spot size of the light beam emitted after passing through the first lens group, the second lens group and the third lens group in sequence, so that the spot size is consistent with the size of the effective area of ​​the DMD, thereby achieving the adaptation of DMD chips of different sizes, which is beneficial to the compatible design of the lighting system and improves the versatility of the lighting system.

[0210] According to the second utility model, the first lens group includes a first lens; the second lens group includes a second lens and a third lens arranged in sequence along the light propagation direction; the third lens group includes a fourth lens; wherein the first lens, the second lens, the third lens and the fourth lens are all spherical lenses; the first lens has a positive refractive power; the second lens has a negative refractive power; the third lens has a positive refractive power; and the fourth lens has a positive refractive power.

[0211] According to the third utility model, the first lens group includes a first lens; the second lens group includes a second lens; the third lens group includes a third lens; the first lens has a positive refractive power; the second lens has a positive refractive power; and the third lens has a positive refractive power. Only three lenses are provided in the illumination system, and by moving the position of the second lens along the optical axis, the size of the light spot emitted by the illumination system can be changed to adapt to the size of the DMD, thereby realizing the zoom function. In addition, the optical path structure in the illumination system is simple, which is conducive to reducing the complexity of the projection equipment and reducing the cost.

[0212] According to the fourth utility model concept, the lighting system also includes a first reflector and a second reflector; the first reflector and the second reflector are both plane reflectors; the first reflector is located between the first lens group and the second lens group, and the second reflector is located between the second lens group and the third lens group; the first reflector is used to receive the light beam emitted by the first lens group and reflect the received light beam to the second lens group; the second reflector is used to receive the light beam emitted by the second lens group and reflect the received light beam to the third lens group.

[0213] According to the fifth utility model concept, the lighting system also includes a first reflector and a second reflector; the first reflector and the second reflector are both plane reflectors; the first reflector and the second reflector are both located between the second lens group and the third lens group; the first reflector is used to receive the light beam emitted by the second lens group and reflect the received light beam to the second reflector; the second reflector is used to receive the light beam reflected by the first reflector and reflect the received light beam to the third lens group.

[0214] Through the reflection effect of the two reflectors, the light path in the lighting system can be folded, which is beneficial to reducing the volume of the lighting system. In addition, the arrangement of the two reflectors is flexible, which is beneficial to improving the versatility of the optical system.

[0215] According to the sixth utility model, the lighting system includes a lighting housing and a first fixing device, a first supporting structure is provided on the lighting housing, and the first fixing device is used to fix the first reflector on the first supporting structure; the first fixing device includes at least two first pressing sheets, at least two first pressing sheets are located on different sides of the first reflector, and the first pressing sheet is used to press the first reflector toward the direction of the first supporting structure. The first reflector is pressed on the first supporting structure by at least two pressing sheets to achieve stable fixation of the first reflector.

[0216] According to the seventh utility model, the lighting system further includes a second fixing device, a second supporting structure is provided on the lighting housing, and the second fixing device is used to fix the second reflector on the second supporting structure; the second fixing device includes at least two second pressing sheets, and the at least two second pressing sheets are located on different sides of the second reflector, and the second pressing sheet is used to press the second reflector toward the second supporting structure. The second reflector is pressed on the second supporting structure by at least two pressing sheets to achieve stable fixation of the second reflector.

[0217] According to the eighth utility model concept, the lighting system also includes: a prism assembly, located between the light modulation component and the third lens group, the prism assembly is used to reflect the light beam emitted by the third lens group to the light modulation component, and transmit the light beam emitted by the light modulation component to the projection lens; a galvanometer assembly, located on the output light path of the light modulation component, the galvanometer assembly includes a circuit board and an optical mirror surface arranged on the circuit board, the circuit board drives the optical mirror surface to flip under electromagnetic action; there is a set angle between the optical mirror surface of the galvanometer assembly and the effective area of ​​the light modulation component.

[0218] According to the ninth utility model, the light modulation component is a first digital micromirror device; the galvanometer assembly is located between the prism assembly and the projection lens; there is a first set angle between the optical mirror surface of the galvanometer assembly and the effective area of ​​the digital micromirror device; or, the light modulation component is a second digital micromirror device; the galvanometer assembly is located between the prism assembly and the second digital micromirror device; there is a second set angle between the optical mirror surface of the galvanometer assembly and the effective area of ​​the second digital micromirror device; wherein the first set angle and the second set angle are different.

[0219] By setting different positions for the galvanometer assembly and setting different set angles between the optical mirror surface of the galvanometer assembly and the effective area of ​​the light modulation component, the light spots emitted by the light modulation components of different sizes can be adapted to achieve a compatible design of the DMD light-emitting side in the illumination system, so that the projection device can be compatible with projection lenses of various projection ratios, thereby achieving maximum compatibility with the projection lenses.

[0220] According to the tenth utility model concept, the lighting system also includes a first adjusting device; the first adjusting device is used to fix the light modulation component and adjust the pressure on the light modulation component; the first adjusting device includes a first board, at least two first screws and a first spring corresponding to each first screw; the first board is used to carry the light modulation component, at least two first through holes are provided on the first board, and at least two first screw holes are provided on the lighting housing, and each first through hole and each first screw hole respectively corresponds to each first screw one by one; the first screw is threadedly connected to the first screw hole on the lighting housing through the first through hole on the first board, and the first spring is sleeved on the screw rod of the first screw and is located on the side of the first board away from the light modulation component.

[0221] By adjusting the compression amount of the first springs sleeved on each first screw, the pressure borne by the light modulation component can be changed to meet the force required by the DMD chip specifications, thereby ensuring stable support and normal operation of the DMD.

[0222] According to the concept of the eleventh utility model, the lighting system also includes a first heat dissipation device; the first heat dissipation device is located on the side of the first adjustment device away from the light modulation component, and is used to dissipate heat for the light modulation component; the first adjustment device also includes at least two second screws and a second spring corresponding to each second screw; at least two second through holes are also provided on the first board, at least two third through holes are provided on the surface of the first heat dissipation device close to the first board, and at least two second screw holes are also provided on the lighting housing, and each second through hole, each third through hole, and each second screw hole respectively corresponds to each second screw; the second screw passes through the third through hole on the first heat dissipation device and the second through hole on the first board in sequence, and is threadedly connected to the second screw hole on the lighting housing, and the second spring is sleeved on the screw rod of the second screw, and is located on the side of the first heat dissipation device away from the first board.

[0223] In a specific implementation, by rotating the second screw, the compression amount of the second spring mounted on the second screw can be changed. The compression amount of the second spring will directly affect the force applied to the first board, thereby affecting the pressure applied to the DMD, thereby achieving the purpose of adjusting the pressure applied to the DMD so that it can match the specification requirements of DMD chips of different sizes.

[0224] According to the twelfth utility model concept, the lighting system also includes a light homogenizing component, which is located between the projection light source and the light modulation component, and is used to homogenize the incident light beam before emitting it; the light homogenizing component is a light guide tube, and the size of the light outlet of the light guide tube is consistent with the size of the effective area of ​​the light modulation component; the lighting system also includes a second adjustment device, which is used to fix the light guide tube and adjust the position of the light outlet of the light guide tube; the second adjustment device includes at least two springs and at least one third screw; at least two springs are respectively against two adjacent outer walls of the outer shell of the light guide tube, and at least one third screw passes through the lighting shell and contacts at least one of the other two adjacent outer walls of the outer shell of the light guide tube. By rotating the third screw, the position of the light outlet of the light guide tube can be changed, so that the light spot emitted by the light guide tube can be accurately incident on the effective area of ​​the DMD.

[0225] 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.

[0226] 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, and configured to shape and modulate the incident projection light beam; The illumination system comprises a positioning structure, and a first lens group, a second lens group, a third lens group and a light modulation component which are sequentially arranged along the propagation direction of the light path, wherein the first lens group, the second lens group and the third lens group are coaxially arranged; the positioning structure comprises at least a first positioning structure and a second positioning structure, wherein the first positioning structure is arranged on a side close to the projection light source, and the second positioning structure is arranged on a side close to the light modulation component; The light modulation component is a first digital micromirror device, and the second lens group is fixed on the first positioning structure so that the size of the light spot emitted through the second lens group matches the size of the effective area of ​​the first digital micromirror device; Alternatively, the light modulation component is a second digital micromirror device, and the second lens group is fixed on the second positioning structure so that the size of the light spot emitted through the second lens group matches the size of the effective area of ​​the second digital micromirror device, wherein the size of the first digital micromirror device is smaller than the size of the second digital micromirror device; The projection lens is located at the light-emitting side of the light modulation component and is used for projecting images.

2. The projection device according to claim 1, characterized in that: The first lens group includes a first lens; the second lens group includes a second lens and a third lens arranged in sequence along the light path propagation direction; the third lens group includes a fourth lens; The first lens has positive refractive power; the second lens has negative refractive power; the third lens has positive refractive power; and the fourth lens has positive refractive power.

3. The projection device according to claim 1, characterized in that: The first lens group includes a first lens; the second lens group includes a second lens; the third lens group includes a third lens; The first lens has positive refractive power; the second lens has positive refractive power; and the third lens has positive refractive power.

4. The projection device according to claim 1, characterized in that: The lighting system further comprises a first reflector and a second reflector; the first reflector and the second reflector are both plane reflectors; The first reflector is located between the first lens group and the second lens group, and the second reflector is located between the second lens group and the third lens group; The first reflector is used to reflect the light beam emitted by the first lens group to the second lens group; The second reflector is used to reflect the light beam emitted by the second lens group to the third lens group; Alternatively, the first reflector and the second reflector are both located between the second lens group and the third lens group, and the first reflector and the second reflector are sequentially arranged along the propagation direction of the light path; the first reflector is used to reflect the light beam emitted by the second lens group to the second reflector; The second reflector is used to reflect the light beam reflected by the first reflector to the third lens group.

5. The projection device according to claim 4, characterized in that: The lighting system further comprises: Lighting housing; A first fixing device, wherein a first supporting structure is disposed on the lighting housing, and the first fixing device is used to fix the first reflector on the first supporting structure; the first fixing device comprises at least two first pressing sheets, and the at least two first pressing sheets are located on different sides of the first reflector, and the first pressing sheets are used to press the first reflector toward the direction of the first supporting structure; A second fixing device, a second supporting structure is arranged on the lighting housing, and the second fixing device is used to fix the second reflector on the second supporting structure; the second fixing device comprises at least two second pressing plates, and at least two second pressing plates are located on different sides of the second reflector, and the second pressing plate is used to press the second reflector toward the direction of the second supporting structure.

6. The projection device according to claim 1, characterized in that: The lighting system further comprises: a prism assembly, located between the light modulation component and the third lens group, the prism assembly being used to reflect the light beam emitted by the third lens group to the light modulation component, and transmit the light beam emitted by the light modulation component to the projection lens; A galvanometer assembly is located on the outgoing light path of the optical modulation component. The galvanometer assembly includes a circuit board and an optical mirror surface arranged on the circuit board. The circuit board drives the optical mirror surface to flip under electromagnetic action. A set angle exists between the optical mirror surface of the galvanometer assembly and the effective area of ​​the optical modulation component.

7. The projection device according to claim 6, characterized in that: The light modulation component is the first digital micromirror device; the galvanometer assembly is located between the prism assembly and the projection lens; there is a first set angle between the optical mirror surface of the galvanometer assembly and the effective area of ​​the first digital micromirror device; Alternatively, the light modulation component is the second digital micromirror device; the galvanometer assembly is located between the prism assembly and the second digital micromirror device; a second set angle exists between the optical mirror surface of the galvanometer assembly and the effective area of ​​the second digital micromirror device; Wherein, the first set angle and the second set angle are different.

8. The projection device according to claim 1, characterized in that: The lighting system further includes a first adjusting device, which is used to fix the light modulation component and adjust the pressure on the light modulation component; the first adjusting device includes a first board, at least two first screws and a first spring corresponding to each first screw, wherein: The first board is used to carry the light modulation component. The first board is provided with at least two first through holes, and the lighting housing is provided with at least two first screw holes. Each first through hole and each first screw hole corresponds to each first screw respectively. The first screw is threadedly connected with the first screw hole on the lighting housing through the first through hole on the first board. The first spring is sleeved on the screw rod of the first screw and is located on the side of the first board away from the light modulation component.

9. The projection device according to claim 8, characterized in that: The lighting system further comprises: The first heat sink is located on a side of the first adjustment device away from the light modulation component, and the first heat sink is used to dissipate heat for the light modulation component; the first adjustment device also includes at least two second screws and a second spring corresponding to each second screw, wherein: At least two second through holes are also provided on the first board, at least two third through holes are provided on the surface of the first heat dissipation device close to the first board, and at least two second screw holes are also provided on the lighting housing, and each second through hole, each third through hole, and each second screw hole respectively corresponds to each second screw; the second screw passes through the third through hole on the first heat dissipation device and the second through hole on the first board in sequence, and is threadedly connected with the second screw hole on the lighting housing, and the second spring is sleeved on the screw rod of the second screw and is located on the side of the first heat dissipation device away from the first board.

10. The projection device according to any one of claims 1 to 9, characterized in that: The lighting system further comprises: A light homogenizing component, the light homogenizing component is located between the projection light source and the first lens group, and is used to homogenize the outgoing light beam of the projection light source and then emit it to the first lens group; the light homogenizing component is a light guide tube, and the size of the light outlet of the light guide tube is consistent with the size of the effective area of ​​the light modulation component; The second adjusting device is used to fix the light guide and adjust the position of the light outlet of the light guide; the second adjusting device includes at least two spring plates and at least one third screw; the at least two spring plates are respectively pressed against two adjacent outer walls of the outer shell of the light guide, and the at least one third screw passes through the lighting housing and contacts at least one of the other two adjacent outer walls of the outer shell of the light guide.

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