Projection device and projection system

Abstract

The invention provides a projection device and a projection system. The projection device comprises a shell; the lens assembly comprises a lens and a lens cone unit, the lens cone unit comprises a lens cone and a diaphragm, the lens cone is arranged on the shell, the diaphragm and the lens are both arranged in the lens cone, the lens forms a lens group, and the diaphragm is located on the light emitting side of the lens group; the diaphragm comprises a barrel-shaped diaphragm body, the diaphragm body is provided with a light through hole, the axial direction of the diaphragm body extends in the light emitting direction of the lens set, the inner wall of the light through hole is provided with at least one concave area, and the face, facing the lens set, of the concave area forms a light blocking part. By adopting the grading light blocking scheme, the temperature of the contact surface with the plastic lens cone can be greatly reduced.

Description

Technical Field

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

[0002] The projection system mainly includes a laser host and a projection screen. The laser host generally includes a laser light source and a projection lens. The laser light source can provide an illumination beam, and the projection lens can receive the image beam and correct and enlarge it before projecting it onto the projection screen for imaging. Currently, in precision projection equipment, with the demand for miniaturization and low-cost strategic routes for laser host products, the lens, as a key part of the laser host engine, will also be designed in the direction of miniaturization and low cost.

[0003] At present, considering the requirement of low cost, the general lens barrel is made of plastic material, and the thickness of the aperture is relatively thin. Since the thermal conductivity coefficient of plastic is much lower than that of metal lens barrel, the heat received by the aperture will quickly accumulate and continue to heat up in the surface in contact with the plastic lens barrel in the incident direction.

[0004] However, the existing aperture structure has a slow heat dissipation when it is too thin, resulting in a sharp increase in the contact surface temperature. When the aperture is too thick, the cost will increase sharply and the heat dissipation effect will not be obvious. When the temperature of the contact surface between the aperture and the plastic lens barrel is too high, the plastic material will be deformed and floated. When the machine runs for a certain period of time, there may be local micro-deformation or local degradation of the plastic lens barrel. Summary of the invention

[0005] The main purpose of the present invention is to provide a projection device and a projection system, which can significantly reduce the temperature of the contact surface with the plastic lens barrel by adopting a graded light blocking solution.

[0006] To achieve the above object, in a first aspect, the present invention provides a projection device, comprising:

[0007] case;

[0008] The lens assembly comprises a lens and a lens barrel unit, wherein the lens barrel unit comprises a lens barrel and an aperture, wherein the lens barrel is arranged on the housing, the aperture and the lens are arranged in the lens barrel, and the lens constitutes a lens group, and the aperture is located at the light exit side of the lens group;

[0009] The aperture includes a cylindrical aperture body having a light-through hole, and the axial direction of the aperture body extends along the light-emitting direction of the lens group. The inner wall of the light-through hole has at least one recessed area, and a side of the recessed area facing the lens group forms a light-blocking portion.

[0010] The beneficial effects of the present invention are as follows: through the design of at least one light-blocking portion, a graded light-blocking scheme is further adopted to expand the diameter of the aperture hole to a certain extent, thereby reducing the energy of the first light-receiving surface and evenly distributing the heat to the entire aperture body, so that the temperature of the contact surface with the plastic lens barrel can be greatly reduced. While reducing the temperature of the contact surface between the aperture body and the plastic lens barrel, the heat dissipation efficiency is also improved, and the problem of overheating of the plastic lens barrel and the aperture body is effectively solved; at the same time, the degradation of the plastic due to excessive temperature, which leads to failure of product analysis, is avoided, that is, the lens analysis effect is not affected, and the aperture volume is effectively reduced, which is small in size and low in cost.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] In some optional embodiments, the radial thickness of the aperture body at one end facing the lens group is greater than the radial thickness at one end facing away from the lens group.

[0013] In some optional embodiments, there are multiple light-blocking portions, which are arranged in sequence along the axial direction of the aperture body. The centers of the light-blocking portions and the light-through holes have different distances, and the distance between the light-blocking portions and the centers of the light-through holes gradually increases from the side toward the lens group to the side away from the lens group.

[0014] In some optional embodiments, the recessed area surrounds the inner wall of the light hole along the circumference of the light hole to form an annular retaining ring, the end surface of the retaining ring facing the lens group forms a light-blocking portion, and the inner diameter of the retaining ring gradually increases along the incident direction of the light.

[0015] In some optional embodiments, there are at least two retaining rings, and the at least two retaining rings are adjacently arranged along the axial direction of the aperture body;

[0016] The retaining ring has a first retaining edge facing the lens group and a second retaining edge away from the lens group. In two adjacent retaining rings, the first retaining edge of the front retaining ring and the second retaining edge of the rear retaining ring are adjacent, and a first angle is formed between the first retaining edge and the second retaining edge.

[0017] In some optional embodiments, at least two first ribs are parallel to each other; and / or,

[0018] At least two second ribs are parallel to each other.

[0019] In some optional embodiments, the angle between the first rib and the axial direction of the aperture body is less than or equal to 90°.

[0020] In some optional embodiments, a connecting unit is further included, which includes a threaded connecting piece. A first connecting hole is provided on the periphery of the aperture body, and a second connecting hole is provided on the lens barrel. The first connecting hole and the second connecting hole match each other, and the threaded connecting piece passes through the first connecting hole and the second connecting hole in sequence to connect the aperture body and the lens barrel.

[0021] In a second aspect, the present invention further provides a projection device, comprising:

[0022] case;

[0023] The lens assembly includes a lens barrel, a lens and an aperture. The lens barrel is arranged on a shell, and the aperture and the lens are both arranged in the lens barrel. The aperture is located on the light emitting side of the lens, and the aperture has a light hole. The radial thickness of the aperture facing the lens is greater than the radial thickness of the end away from the lens.

[0024] In a third aspect, the present invention further provides a projection system, including a projection screen and a projection device, wherein the projection device is used to project a projection picture onto the projection screen.

[0025] The present invention provides a projection device and a projection system, wherein the projection system includes a projection screen and a projection device, and the projection device is used to project a projection picture onto the projection screen. The projection device includes: a housing; a lens assembly, including a lens and a lens barrel unit, the lens barrel unit includes a lens barrel and an aperture, the lens barrel is arranged on the housing, the aperture and the lens are both arranged in the lens barrel, and the lens constitutes a lens group, and the aperture is located on the light-emitting side of the lens group; the aperture includes a cylindrical aperture body, the aperture body has a light-through hole, and the axial direction of the aperture body extends along the light-emitting direction of the lens group, the inner wall of the light-through hole has at least one recessed area, and the side of the recessed area facing the lens group forms a light-blocking portion.

[0026] By designing at least one light-blocking portion and further adopting a graded light-blocking solution, the diameter of the aperture hole can be expanded to a certain extent, thereby reducing the energy of the first light-receiving surface and evenly distributing the heat to the entire aperture body, so that the temperature of the contact surface with the plastic lens barrel can be greatly reduced. While reducing the temperature of the contact surface between the aperture body and the plastic lens barrel, the heat dissipation efficiency is also improved, and the problem of overheating at the position of the plastic lens barrel and the aperture body is effectively solved; at the same time, it avoids the degradation of the plastic due to excessive temperature, which leads to the failure of product analysis, that is, it will not affect the lens analysis effect, and effectively reduces the size of the aperture, which is small in size and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 It is a schematic diagram of the structure of a diaphragm in a projection device in the prior art;

[0029] Figure 2 It is a schematic diagram of the structure of another aperture in a projection device in the prior art;

[0030] Figure 3 It is a schematic diagram of the structure of another aperture in a projection device in the prior art;

[0031] Figure 4 A schematic diagram of the structure of a projection device provided in an embodiment of the present application;

[0032] Figure 5 for Figure 4 A partial enlarged view of point I in the middle;

[0033] Figure 6 A schematic diagram of the structure of an aperture in a projection device provided in an embodiment of the present application;

[0034] Figure 7 A schematic diagram of a partial structure of an aperture in a projection device provided in an embodiment of the present application;

[0035] Figure 8 A schematic diagram of the structure of a lens assembly in a projection device provided in an embodiment of the present application;

[0036] Fig. 9 A cross-sectional view of a lens assembly in a projection device provided in an embodiment of the present application;

[0037] Fig.10 A schematic diagram of a partial structure of a lens assembly in a projection device provided in an embodiment of the present application;

[0038] Fig.11 A partial exploded schematic diagram of a lens assembly in a projection device provided in an embodiment of the present application;

[0039] Fig.12 A schematic diagram of the structure of another aperture in the projection device provided in an embodiment of the present application.

[0040] Description of reference numerals:

[0041] 100- projection device;

[0042] 110-housing;

[0043] 120-lens assembly;

[0044] 121- Lens;

[0045] 122-lens tube;

[0046] 123- aperture;

[0047] 1231-Aperture body;

[0048] 1232-light blocking part;

[0049] 1233- retaining ring;

[0050] 12331-first rib;

[0051] 12332-second rib;

[0052] 200 - Reflector. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. All other embodiments obtained are within the scope of protection of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0057] Figure 1 is a schematic diagram of the structure of a diaphragm in a projection device in the prior art, Figure 2 FIG. 1 is a schematic diagram of the structure of another aperture in a projection device in the prior art. Figure 3 FIG. 2 is a schematic diagram of the structure of another aperture in a projection device in the prior art. Figures 1 to 3 As shown, currently, considering the requirement of low cost, generally the lens barrel 122 is made of plastic material, and the thickness of the aperture 123 is relatively thin. Since the thermal conductivity coefficient of plastic is much lower than that of the metal lens barrel 122, the heat received by the aperture 123 will quickly accumulate heat and continue to heat up on the surface in contact with the plastic lens barrel 122 in the incident direction. However, when the existing aperture 123 structure is too thin, the heat dissipation is slow, resulting in a sharp increase in the temperature of the contact surface. When the aperture 123 is too thick, the cost will increase sharply and the heat dissipation effect will not increase significantly. When the temperature of the contact surface between the aperture 123 and the plastic lens barrel 122 is too high, the plastic material will be deformed and floated. When the machine runs for a certain period of time, there may be local micro-deformation or local degradation of the plastic lens barrel 122.

[0058] In order to overcome the defects in the prior art, the projection device and projection system provided by the present invention, through the design of at least one light-blocking part, further adopt a graded light-blocking scheme to expand the diameter of the aperture hole to a certain extent, thereby reducing the energy of the first light-receiving surface and evenly distributing the heat to the entire aperture body, so that the temperature of the contact surface with the plastic lens barrel can be greatly reduced. While reducing the temperature of the contact surface between the aperture body and the plastic lens barrel, the heat dissipation efficiency is also improved, and the problem of overheating at the position of the plastic lens barrel and the aperture body is effectively solved; at the same time, it avoids the degradation of plastic due to excessive temperature and causing product analysis failure, that is, it will not affect the lens analysis effect, and effectively reduce the size of the aperture, which is small in size and low in cost.

[0059] The content of the present invention will be described in detail below in conjunction with the accompanying drawings so that those skilled in the art can understand the content of the present invention more clearly and in detail.

[0060] Figure 4 A schematic diagram of the structure of a projection device provided in an embodiment of the present application, Figure 5 for Figure 4 The local enlarged view of point I in the middle, Figure 6 This is a schematic diagram of the structure of an aperture in a projection device provided in an embodiment of the present application. Figure 7 A schematic diagram of the partial structure of an aperture in a projection device provided in an embodiment of the present application.

[0061] like Figures 4 to 7 As shown, the embodiment of the present application provides a projection device 100, including:

[0062] The housing 110 is used as a mounting base for other components and provides protection for other components.

[0063] The lens assembly 120 includes a lens 121 and a lens barrel unit. The lens barrel unit includes a lens barrel 122 and an aperture 123. The lens barrel 122 is arranged on the housing 110. The aperture 123 and the lens 121 are both arranged in the lens barrel 122. The lens 121 constitutes a lens group, and the aperture 123 is located on the light-emitting side of the lens group.

[0064] Among them, the aperture 123 includes a cylindrical aperture body 1231, the aperture body 1231 has a light hole, and the axial direction of the aperture body 1231 extends along the light output direction of the lens group. The inner wall of the light hole has at least one recessed area, and the side of the recessed area facing the lens group forms a light blocking portion 1232.

[0065] Through the above-mentioned arrangement, that is, through the design of at least one light-blocking portion 1232, a graded light-blocking scheme is further adopted to expand the diameter of the aperture 123 hole to a certain extent, thereby reducing the energy of the first light-receiving surface and evenly distributing the heat to the entire aperture body 1231, so that the temperature of the contact surface with the plastic lens barrel 122 can be greatly reduced. While reducing the temperature of the contact surface between the aperture body 1231 and the plastic lens barrel 122, the heat dissipation efficiency is also improved, and the problem of overheating at the position of the plastic lens barrel 122 and the aperture body 1231 is effectively solved; at the same time, it avoids the failure of product analysis due to plastic degradation caused by excessive temperature, that is, it will not affect the lens analysis effect, and effectively reduce the size of the aperture 123, which is small in size and low in cost.

[0066] The following is a detailed description of the various structures of the projection device 100:

[0067] The housing 110 is used to install the lens assembly 120 , and the accommodation space of the housing 110 is slightly larger than the appearance size of the lens assembly 120 .

[0068] In some examples, the housing 110 may be a metal piece or a plastic material. It should be noted that the specific material of the housing 110 is not too limited in the embodiments of the present application.

[0069] The lens assembly 120 includes a lens 121 and a lens barrel unit. The lens barrel unit includes a lens barrel 122 and an aperture 123. The lens barrel 122 is disposed on the housing 110. The aperture 123 and the lens 121 are both disposed in the lens barrel 122. The lens 121 constitutes a lens group. The aperture 123 is located at the light exit side of the lens group.

[0070] It should be noted that the lens assembly 120 can project an image beam, and the image beam can project an image picture on the projection screen for users to watch.

[0071] The lens 121 is a transparent material with two surfaces having different curvatures, so that the propagation direction or zoom of light can be changed as needed when the light passes through. The lens 121 can be used in optical instruments, glasses, camera lenses, etc. A lens is one of the common lenses 121, which can focus or disperse light according to its curvature.

[0072] In projection, commonly used lenses are convex lenses and concave lenses. Convex lenses can focus parallel light rays to a point, called the focus. Concave lenses disperse parallel light rays. By using the appropriate type and curvature of lens 121, the light in the projector can be adjusted so that the projected image is clearly visible.

[0073] The aperture 123 is mainly used to control the propagation of light and adjust the diameter of light. It is usually composed of a circular or polygonal opening, and the size of the aperture 123 can be adjusted to control the entry and exit of light. The function of the aperture 123 is to control the propagation direction of light and limit its radial distribution, thereby adjusting the size and shape of the light beam. It can be used to control the intensity, angle, focus and dispersion of light, and can also reduce or eliminate aberrations and scattering in some optical systems.

[0074] In some optical instruments and devices, the aperture 123 can also be used to limit the propagation of non-spindle light, thereby reducing the astigmatism generated at the focus or imaging plane. Its adjustment is usually controlled by mechanical or electronic means to accurately adjust the light as needed.

[0075] In some examples, the aperture 123 and the lens barrel 122, and the lens 121 and the lens barrel 122 may be connected in a detachable connection or a fixed connection, such as a bolt, a buckle, or a hanging connection. Specifically, the embodiments of the present application are not too restrictive here.

[0076] The aperture 123 includes a cylindrical aperture body 1231, which has a light hole, and the axial direction of the aperture body 1231 extends along the light output direction of the lens group. The inner wall of the light hole has at least one recessed area, and a light blocking portion 1232 is formed on a side of the recessed area facing the lens group.

[0077] In this way, the light-blocking portion 1232 can block part of the light. Since the light emitted from the lens group cannot penetrate the aperture body 1231, when the projection device 100 works for a long time, the aperture body 1231 receives a high amount of heat and the surface in contact with the lens barrel 122 will quickly accumulate heat and continue to heat up. In order to prevent the lens barrel 122 from being damaged by excessive temperature, the aperture body 1231 is designed with a light-blocking portion 1232, which can block part of the light and thus block part of the heat.

[0078] Since the aperture body 1231 has at least one light-blocking portion 1232 , the energy of the first light-receiving surface can be reduced and the heat can be evenly distributed to the entire aperture body 1231 , thereby effectively solving the problem of overheating at the position of the plastic lens barrel 122 and the aperture body 1231 .

[0079] It should be noted that, through experiments, the temperature of the contact surface between the aperture body 1231 and the plastic lens barrel 122 can be reduced by 40-60° C., and the cooling effect is significant.

[0080] In addition, it should be noted that the lens assembly 120 in the projection device 100 provided in the embodiment of the present application may be an ultra-short focus lens, and of course may also be a telephoto lens. Specifically, the embodiment of the present application does not impose any additional restrictions here.

[0081] like Figure 4 As shown, the lens assembly 120 can be used in an ultra-short-throw lens, wherein a reflector 200 is added to meet the requirements of the ultra-short-throw lens.

[0082] like Figures 4 to 7 As shown, in some optional embodiments, the radial thickness of the aperture body 1231 at one end facing the lens group is greater than the radial thickness at one end away from the lens group.

[0083] It should be noted that the thickness of the aperture body 1231 increases along the axial direction of the lens group, and more heat can be absorbed by increasing the thickness.

[0084] It should be noted that after many experiments, the existing technical solutions: Figure 1 As shown, the temperature of the contact surface between the monitoring aperture body 1231 and the plastic lens barrel 122 is 151° C. After the small volume energy is absorbed, it is concentrated on the thin sheet of the aperture body 1231 and is difficult to dissipate. It is mainly concentrated on the contact surface between the aperture body 1231 and the rear group lens barrel 122, resulting in excessive local temperature and plastic coking.

[0085] like Figure 2 As shown, the temperature of the contact surface between the monitoring aperture body 1231 and the plastic lens barrel 122 is 145° C. After increasing the thickness, the light blocking aperture of the aperture body 1231 is increased at the same time. By increasing the thickness of the inner hole of the aperture body 1231 to block light (no effect), the heat dissipation speed increases due to the increase in the heat dissipation area, but the temperature is still very high and cannot meet the specification requirements.

[0086] like Figure 3 As shown, the temperature of the contact surface between the monitoring aperture body 1231 and the plastic lens barrel 122 is 135° C. After the thickness is increased, the heat dissipation speed increases due to the increase in the heat dissipation area, but the temperature is still very high and cannot meet the specification requirements.

[0087] like Figure 6 and Figure 7 As shown, the projection device 100 provided in the embodiment of the present application monitors the temperature of the contact surface between the aperture body 1231 and the plastic lens barrel 122 to be 105° C. The temperature of the contact surface between the aperture body 1231 and the plastic lens barrel 122 is monitored to be 105° C. The thickness is increased while increasing the position for absorbing heat, the temperature of the contact surface between the aperture body 1231 and the lens barrel 122 is reduced, and the heat is evenly distributed on the aperture body 1231, and is quickly transferred out through the main lens barrel 122.

[0088] Figure 8 This is a schematic diagram of the structure of a lens assembly in a projection device provided in an embodiment of the present application. Fig. 9 A cross-sectional view of a lens assembly in a projection device provided in an embodiment of the present application, Fig.10A schematic diagram of a partial structure of a lens assembly in a projection device provided in an embodiment of the present application, Fig.11 A partial exploded schematic diagram of a lens assembly in a projection device provided in an embodiment of the present application

[0089] like Figures 4 to 11 As shown, in some optional embodiments, there are multiple light-blocking portions 1232, which are arranged in sequence along the axial direction of the aperture body 1231. Each light-blocking portion 1232 has a different distance from the center of the light-through hole, and the distance between the light-blocking portion 1232 and the center of the light-through hole gradually increases from the side toward the lens group to the side away from the lens group.

[0090] It can be understood that along the emission direction of the lens group, multiple light blocking parts 1232 are connected and arranged in sequence to block light multiple times and evenly distribute heat to each light blocking part 1232, so that the temperature of the contact surface with the plastic lens barrel 122 can be greatly reduced.

[0091] It should be noted that the design of different distances between the center of each light-blocking portion 1232 and the light-through hole can more accurately and evenly distribute the heat to each light-blocking portion 1232, wherein the distance between each light-blocking portion 1232 and the center of the light-through hole can be adjusted according to actual conditions and is not overly restricted here.

[0092] like Figures 4 to 11 As shown, in some optional embodiments, the recessed area surrounds the inner wall of the light hole along the circumference of the light hole to form an annular retaining ring 1233, and the end surface of the retaining ring 1233 facing the lens group forms a light blocking portion 1232, and along the incident direction of the light, the inner diameter of the retaining ring 1233 gradually increases.

[0093] It is understandable that, in order to facilitate processing and manufacturing, the recessed area of ​​the aperture body 1231 is a rotating body structure.

[0094] The portion that blocks the light is the light blocking portion 1232, which is located on the end face of the retaining ring 1233 facing the lens group, and can expand the diameter of the aperture 123 to a certain extent, thereby reducing the energy of the first light-receiving surface.

[0095] In some optional embodiments, there are at least two retaining rings 1233, and at least two retaining rings 1233 are adjacently arranged along the axial direction of the aperture body 1231;

[0096] The retaining ring 1233 has a first retaining edge 12331 facing the lens group and a second retaining edge 12332 away from the lens group. In two adjacent retaining rings 1233, the first retaining edge 12331 of the previous retaining ring 1233 and the second retaining edge 12332 of the subsequent retaining ring 1233 are adjacent, and a first angle is formed between the first retaining edge 12331 and the second retaining edge 12332.

[0097] It can be understood that there are multiple retaining rings 1233, and the multiple retaining rings 1233 are connected in sequence, wherein each retaining ring 1233 includes a first retaining edge 12331 and a second retaining edge 12332, and the first retaining edge 12331 is used to block part of the light, which means that the first retaining edge 12331 can block light to reduce the energy of the light-receiving surface, and the corresponding multiple first retaining edges 12331 in the multiple retaining rings 1233 are respectively graded to block light in sequence, and the heat is evenly distributed on the entire aperture body 1231, so that the temperature of the contact surface with the plastic lens barrel 122 can be greatly reduced.

[0098] In addition, it can be understood that the provision of the second rib 12332 facilitates the connection of two adjacent first ribs 12331, thereby achieving a better light blocking effect and ensuring the integrity of the entire structure.

[0099] It should be noted that the first flange 12331 and the second flange 12332 are integrally formed, which can ensure that the first flange 12331 and the second flange 12332 are integrally formed and manufactured and are inseparable from each other. On the one hand, the number of parts used can be reduced, the difficulty of assembly and the requirements for assembly accuracy can be reduced, and the process of welding the first flange 12331 and the second flange 12332 to improve assembly efficiency.

[0100] On the other hand, the overall rigidity of the retaining ring 1233 can be improved, the possibility of loosening between the first retaining edge 12331 and the second retaining edge 12332 can be reduced, and the structural strength is relatively high.

[0101] It should be noted that, in some embodiments, the first side 12331 and the second side 12332 are connected in an integrated manner, and in other embodiments, the first side 12331 and the second side 12332 can also be connected in other manners. As long as the connection method can fix the first side 12331 and the second side 12332, the purpose of this embodiment can be achieved. Here, there is no restriction on the connection method of the first side 12331 and the second side 12332.

[0102] like Figures 4 to 11 As shown, in some optional embodiments, at least two first ribs 12331 are parallel to each other; and / or,

[0103] At least two second ribs 12332 are parallel to each other.

[0104] It should be noted that such a configuration is convenient for processing and manufacturing, and at the same time, can evenly block light and evenly distribute heat to the entire aperture body 1231, thereby reducing the temperature of the contact surface between the aperture body 1231 and the plastic lens barrel 122 and improving the heat dissipation efficiency.

[0105] In some optional embodiments, the angle between the first rib 12331 and the axial direction of the aperture body 1231 is less than or equal to 90°.

[0106] It should be noted that, such a configuration enables the first retaining edge 12331 to better face the lens group to block light.

[0107] Fig.12 A schematic diagram of the structure of another aperture in the projection device provided in an embodiment of the present application is shown in FIG. Fig.12 As shown, the first retaining edge 12331 and the second retaining edge 12332 are perpendicular to each other, wherein the inclined light emitted from the lens 121 is evenly blocked by the multiple first retaining edges 12331 to reduce the temperature.

[0108] In some optional embodiments, a connecting unit is further included, which includes a threaded connecting piece. A first connecting hole is provided on the periphery of the aperture body 1231, and a second connecting hole is provided on the lens barrel 122. The first connecting hole and the second connecting hole match each other, and the threaded connecting piece passes through the first connecting hole and the second connecting hole in sequence to connect the aperture body 1231 and the lens barrel 122.

[0109] In some embodiments, there may be multiple or one threaded connector, and the threaded connector serves to connect the aperture body 1231 and the lens barrel 122 to ensure the stability of the aperture body 1231 when it is installed on the lens barrel 122 and to avoid looseness between the two.

[0110] It is understandable that when there are multiple threaded connectors, the multiple threaded connectors can be arranged at intervals on the same side or different sides of the lens barrel 122 to improve the stability of the connection.

[0111] In some embodiments, the threaded connector can be a threaded connector or other threaded connector, as long as it can ensure that the aperture body 1231 is installed on the lens barrel 122, and there are no excessive restrictions on the specifics.

[0112] Of course, it should be noted that in the embodiment of the present application, considering the cost of the threaded connector, the threaded connector can be a threaded fastener. Correspondingly, a first connecting hole is opened on the aperture body 1231, and the first connecting hole can be a threaded hole. The threaded connector can pass through the first connecting hole and can be tightened or loosened to adjust the fixed and disassembled states.

[0113] In addition, correspondingly, a second connecting hole is opened on the lens barrel 122, and the second connecting hole can also be a threaded hole. The threaded connector can pass through the first connecting hole, and the fixing and disassembly states can be adjusted by tightening or loosening.

[0114] Specifically, the threaded connector passes through the first connecting hole and the second connecting hole in sequence and is tightened, thereby fixing the aperture body 1231 to the lens barrel 122. Of course, when the aperture body 1231 needs to be removed, it is only necessary to loosen the threaded connector and then remove the threaded connector from the second connecting hole and the first connecting hole in sequence.

[0115] The projection device provided in the embodiment of the present application includes: a shell; a lens assembly, including a lens and a lens barrel unit, the lens barrel unit includes a lens barrel and an aperture, the lens barrel is arranged on the shell, the aperture and the lens are both arranged in the lens barrel, and the lens constitutes a lens group, and the aperture is located on the light-emitting side of the lens group; the aperture includes a cylindrical aperture body, the aperture body has a light-through hole, and the axial direction of the aperture body extends along the light-emitting direction of the lens group, the inner wall of the light-through hole has at least one recessed area, and a side of the recessed area facing the lens group forms a light-blocking portion.

[0116] By designing at least one light-blocking portion and further adopting a graded light-blocking solution, the diameter of the aperture hole can be expanded to a certain extent, thereby reducing the energy of the first light-receiving surface and evenly distributing the heat to the entire aperture body, so that the temperature of the contact surface with the plastic lens barrel can be greatly reduced. While reducing the temperature of the contact surface between the aperture body and the plastic lens barrel, the heat dissipation efficiency is also improved, and the problem of overheating at the position of the plastic lens barrel and the aperture body is effectively solved; at the same time, it avoids the degradation of the plastic due to excessive temperature, which leads to the failure of product analysis, that is, it will not affect the lens analysis effect, and effectively reduces the size of the aperture, which is small in size and low in cost.

[0117] In addition, if Figures 4 to 12 As shown, the embodiment of the present application further provides a projection device 100, comprising:

[0118] Housing 110;

[0119] The lens assembly 120 includes a lens barrel 122, a lens 121 and an aperture 123. The lens barrel 122 is disposed on the housing 110. The aperture 123 and the lens 121 are both disposed in the lens barrel 122. The aperture 123 is located at the light emitting side of the lens 121.

[0120] The aperture 123 has a light-through hole, and the radial thickness of the aperture 123 at one end facing the lens 121 is greater than the radial thickness of the aperture 123 at one end facing away from the lens 121 .

[0121] The projection device provided in the embodiment of the present application, through the design of at least one light-blocking portion, further adopts a graded light-blocking scheme to expand the diameter of the aperture hole to a certain extent, thereby reducing the energy of the first light-receiving surface and evenly distributing the heat to the entire aperture body, so that the temperature of the contact surface with the plastic lens barrel can be greatly reduced. While reducing the temperature of the contact surface between the aperture body and the plastic lens barrel, the heat dissipation efficiency is also improved, and the problem of overheating at the position of the plastic lens barrel and the aperture body is effectively solved; at the same time, it avoids the degradation of the plastic due to excessive temperature, which leads to the failure of product analysis, that is, it will not affect the lens analysis effect, and effectively reduces the size of the aperture, which is small in size and low in cost.

[0122] In addition, an embodiment of the present application further provides a projection system, including a projection screen and the above-mentioned projection device 100, wherein the projection device 100 is used to project a projection picture onto the projection screen.

[0123] The projection screen comprises a display film, and the front side of the display film is a projection light receiving surface.

[0124] It should be noted that the projection screen includes a diaphragm body and a connecting cloth. The diaphragm body is usually made of hard materials, including multiple optical structure layers, and has a certain degree of hardness, brittleness and rigidity compared to a soft screen. Therefore, when the diaphragm body is stretched, a relatively flat surface can be formed. In this way, at least part of the front area of ​​the diaphragm body can be used as a light receiving area for projecting images, so that the picture and image can be projected on the front of the diaphragm body for display.

[0125] Since the hard material constituting the diaphragm body is usually hard and brittle, if holes or grooves are directly punched on the hard diaphragm body for fixing, the diaphragm body is likely to crack.

[0126] In order to connect and fix the hard diaphragm body, the display diaphragm in this embodiment further includes a soft connecting cloth. The connecting cloth can be bonded to the hard diaphragm body and connected to other fixing structures, thereby completing the fixation of the diaphragm body.

[0127] At this time, the connecting cloth and the diaphragm body are bonded to each other, so the stretching degree of the connecting cloth will also affect the curling or unfolding of the diaphragm body.

[0128] In some examples, in order to achieve connection with the diaphragm body, the connecting cloth has a sufficient size to at least cover the area on the back of the diaphragm body opposite to the front light-receiving area. At this time, the back of the light-receiving area is bonded to the connecting cloth. In this way, when the connecting cloth is in a flat stretched state, the light-receiving area on the diaphragm body for projecting an image will also be stretched, thereby achieving better picture display quality.

[0129] The projection system provided in this embodiment specifically includes a projection screen and the projection device 100 in the aforementioned embodiment. The projection device 100 is used to project a projection picture onto a display film of the projection screen.

[0130] The specific structure, working principle and function of the projection device 100 have been described in detail in the aforementioned embodiment 1, and will not be repeated here.

[0131] Specifically, in the projection system of this embodiment, the projection device 100 can be any existing projector, such as a laser projector, etc. The projection device 100 can project a projection image onto the display film of the projection screen, so that the display film can display the projection image for people to watch.

[0132] By designing at least one light-blocking portion and further adopting a graded light-blocking solution, the diameter of the aperture hole can be expanded to a certain extent, thereby reducing the energy of the first light-receiving surface and evenly distributing the heat to the entire aperture body, so that the temperature of the contact surface with the plastic lens barrel can be greatly reduced. While reducing the temperature of the contact surface between the aperture body and the plastic lens barrel, the heat dissipation efficiency is also improved, and the problem of overheating at the position of the plastic lens barrel and the aperture body is effectively solved; at the same time, it avoids the degradation of the plastic due to excessive temperature, which leads to the failure of product analysis, that is, it will not affect the lens analysis effect, and effectively reduces the size of the aperture, which is small in size and low in cost.

[0133] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0134] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A projection device, characterized in that: include: case; A lens assembly, comprising a lens and a lens barrel unit, wherein the lens barrel unit comprises a lens barrel and an aperture, wherein the lens barrel is arranged on the housing, wherein the aperture and the lens are both arranged in the lens barrel, and wherein the lens constitutes a lens group, and the aperture is located at a light exit side of the lens group; The aperture includes a cylindrical aperture body having a light-through hole, and the axial direction of the aperture body extends along the light-emitting direction of the lens group. The inner wall of the light-through hole has at least one recessed area, and a light-blocking portion is formed on a side of the recessed area facing the lens group.

2. The projection device according to claim 1, characterized in that: The radial thickness of the aperture body at one end facing the lens group is greater than the radial thickness at one end facing away from the lens group.

3. The projection device according to claim 2, characterized in that: There are multiple light-blocking parts, which are arranged in sequence along the axial direction of the aperture body. The centers of the light-blocking parts and the light-through hole have different distances, and the distance between the light-blocking parts and the centers of the light-through hole gradually increases from the side toward the lens group to the side away from the lens group.

4. The projection device according to any one of claims 1 to 3, characterized in that: The recessed area surrounds the inner wall of the light through hole along the circumference of the light through hole to form an annular retaining ring, and the end surface of the retaining ring facing the lens group forms the light blocking portion, and the inner diameter of the retaining ring gradually increases along the incident direction of the light.

5. The projection device according to claim 4, characterized in that: There are at least two retaining rings, and at least two retaining rings are adjacently arranged along the axial direction of the aperture body; The retaining ring has a first retaining edge facing the lens group and a second retaining edge away from the lens group. In two adjacent retaining rings, the first retaining edge of the previous retaining ring and the second retaining edge of the next retaining ring are adjacent to each other, and a first angle is formed between the first retaining edge and the second retaining edge.

6. The projection device according to claim 5, characterized in that: At least two of the first ribs are parallel to each other; and / or, At least two of the second ribs are parallel to each other.

7. The projection device according to claim 5, characterized in that: An angle between the first rib and the axial direction of the aperture body is less than or equal to 90°.

8. The projection device according to any one of claims 1 to 3, characterized in that: It also includes a connecting unit, which includes a threaded connecting piece. A first connecting hole is provided on the periphery of the aperture body, and a second connecting hole is provided on the lens barrel. The first connecting hole and the second connecting hole match each other. The threaded connecting piece passes through the first connecting hole and the second connecting hole in sequence to connect the aperture body and the lens barrel.

9. A projection device, characterized in that: include: case; A lens assembly, comprising a lens barrel, a lens and an aperture, wherein the lens barrel is arranged on the housing, the aperture and the lens are both arranged in the lens barrel, and the aperture is located at the light exit side of the lens; The aperture has a light-through hole, and a radial thickness of the aperture at one end facing the lens is greater than a radial thickness of an end away from the lens.

10. A projection system, characterized in that: It comprises a projection screen and the projection device according to any one of claims 1 to 9, wherein the projection device is used to project a projection picture onto the projection screen.

Images