Multi-focal-length condensing lens, light-emitting assembly and LED display screen

Abstract

The utility model relates to the technical field of optical lenses, in particular to a multi-focal-section condensing lens, a light-emitting assembly and an LED display screen. The multi-focal-segment condensing lens comprises a convex lens body, the convex lens body is provided with a lens light inlet surface and lens light outlet curved surfaces, and the lens light outlet curved surfaces are symmetrically arranged with respect to a central axis parallel to the first direction, so that light emitted from the two sides of the central axis in the first direction is symmetrical; the curvature of a first curved surface area and the curvature of a second curved surface area, distributed in the first direction, of the light outlet face of the lens are different, and the curvature of the first curved surface area is larger than that of the second curved surface area so that light emitted from the first curved surface area can at least deflect towards the direction of the second curved surface area. Therefore, a large amount of light rays emitted by the multi-focal-section condensing lens are focused on one side, namely, the light rays with redundant light visual angles are deflected and utilized, and the light ray utilization rate is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical lens technical field, especially to multi focal section condensing lens, light emitting assembly and LED display screen. BACKGROUND

[0002] At present, the light emitting surface of the LED display screen using lens is spherical, although the design and production of the spherical surface are relatively simple, but the symmetrical design is easy to cause the light emitting visual angle redundancy, resulting in the lower light energy utilization rate. For example, the common road information display screen is hung on the portal frame or the "F" type stand column, and the driver's viewing angle is generally from below to above, and the driver rarely looks from above to below. According to normal use, the light energy above the display screen is greatly wasted. CONTENT

[0003] The utility model discloses a multi focal section condensing lens, light emitting assembly and LED display screen, and aims at the technical problem that the symmetrical design of the existing lens causes the light emitting visual angle redundancy, resulting in the lower light energy utilization rate.

[0004] In order to achieve the above object, the utility model discloses a multi focal section condensing lens in the first aspect, including convex lens body, the convex lens body has lens light inlet surface, lens light outlet curved surface and lens main shaft, the lens light outlet curved surface is with the central axis of parallel first direction symmetry and is set, the first direction is with the plane of vertical the light transmission main shaft parallel, the lens light outlet curved surface along the first direction distribution has first curved surface area and second curved surface area, the curvature of first curved surface area is greater than the curvature of second curved surface area, so that the light of first curved surface area is at least partial to the side of second curved surface area deflection.

[0005] Optionally, the first curved surface area and the second curved surface area are all composed of multiple curved surfaces with different curvatures, the curvature of the curved surface of the first curved surface area decreases from the edge to the arc top, the curvature of the curved surface of the second curved surface area increases from the arc top to the edge, the arc top of the first curved surface area is connected with the arc top of the second curved surface area, the change rate of the curved surface of the first curved surface area is less than the change rate of the curvature of the second curved surface area, and the average curvature of the first curved surface area is greater than the average curvature of the second curved surface area.

[0006] Optionally, the lens light outlet curved surface is divided into the first curved surface area and the second curved surface area by the first plane, and the first plane is perpendicular to the first direction.

[0007] Optionally, the lens main shaft is on the first plane.

[0008] Optionally, the light-incident surface of the lens is a plane, the light-incident surface of the lens is not in the focal region of the first curved surface region, and the light-incident surface of the lens is located on the side of the focal region of the first curved surface region away from the light-outceasing surface of the lens.

[0009] Optionally, it also includes a light guide post having an incident end face and an exit end face, the exit end face of the light guide post being connected to the light incident surface of the lens.

[0010] Optionally, the light guide axis of the light guide post is offset relative to the lens axis in the first direction towards the first curved surface region.

[0011] Optionally, the light guide post and the convex lens body are integrally formed.

[0012] The second aspect of this utility model provides a light-emitting component, including a light source and a multi-focal-length focusing lens disclosed in the first aspect of this utility model. The light source is disposed on one side of the light-incident surface of the lens, and the light-emitting main axis of the light source is offset towards the first curved surface region in a first direction, so that the light source is located on the side of the lens main axis close to the first curved surface region.

[0013] The third aspect of this utility model provides an LED display screen, including the light-emitting component provided in the third aspect of this utility model.

[0014] The technical solution provided by this utility model can include the following beneficial effects:

[0015] In the multi-focal-length condensing lens provided by this invention, the light-emitting surface of the lens is symmetrically arranged around a central axis parallel to a first direction, ensuring that the light emitted from both sides of the central axis in the first direction is symmetrical. Furthermore, the curvatures of the first and second curved surface regions distributed along the first direction of the light-emitting surface are different, with the curvature of the first curved surface region being greater than that of the second curved surface region. This ensures that the light emitted from the first curved surface region is deflected at least towards the direction of the second curved surface region. Consequently, a large amount of light emitted from the multi-focal-length condensing lens is focused to one side, effectively deflecting and utilizing the redundant light rays and improving light utilization efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the multi-focal length focusing lens of this utility model;

[0018] Figure 2 This is a front view of the light-emitting surface of the lens of this utility model;

[0019] Figure 3 This is a side view of the structure of the multi-focal length condenser lens of this utility model;

[0020] Figure 4 This is a schematic diagram of the light path emitted by the light-emitting component of this utility model;

[0021] Figure 5 This is a schematic diagram of the light path of the light-emitting component of this utility model when sunlight is incident on it.

[0022] Figure 6 This is the longitudinal section of the multi-focal-length condenser lens of this utility model;

[0023] Figure 7 This is a schematic diagram of the structure of the light-emitting component with light guide pillar of this utility model;

[0024] In the attached diagram: 1-convex lens body, 11-lens incident light surface, 12-lens exiting light surface, 13-lens main axis, 14-central axis, 15-first curved surface area, 16-second curved surface area, 17-first plane, 2-light guide post, 21-incident end face, 22-exit end face, 23-light guide main axis, 3-light source, 31-light emission main axis, 32-PCB board. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] The following is combined with Figure 1 and Figure 2 The multi-focal-length focusing lens of this utility model includes a convex lens body 1. The convex lens body 1 has a lens incident surface 11, a lens exiting surface 12, and a lens principal axis 13. The lens exiting surface 12 is symmetrically arranged with a central axis 14 parallel to a first direction, and the first direction is parallel to a plane perpendicular to the lens principal axis 13. The lens exiting surface 12 has a first curved surface region 15 and a second curved surface region 16 distributed along the first direction. The curvature of the first curved surface region 15 is greater than the curvature of the second curved surface region 16, so that the light emitted from the first curved surface region 15 is at least partially deflected to one side of the second curved surface region 16.

[0030] In the multi-focal-length condensing lens provided by this utility model, the light-emitting surface 12 of the lens is symmetrically arranged with respect to the central axis 14 parallel to the first direction, so that the light emitted from both sides of the central axis 14 in the first direction is symmetrical. The curvatures of the first curved surface region 15 and the second curved surface region 16 distributed along the first direction of the light-emitting surface of the lens are different, and the curvature of the first curved surface region 15 is greater than that of the second curved surface region 16, so that the light emitted from the first curved surface region 15 will at least be deflected towards the direction of the second curved surface region 16. In this way, a large amount of light emitted from the multi-focal-length condensing lens is focused on one side, that is, the redundant light emitted from the optical angle is deflected and utilized, improving the light utilization rate.

[0031] For ease of understanding, Figure 3 This illustration shows the difference between a multifocal focusing lens of one embodiment and a conventional lens in a longitudinal cross-section, with the first direction being vertically downward. The convex surface a (dashed line) of a conventional lens is a standard spherical surface or a curved surface formed by rotating a quadratic curve. The lower half of the convex surface a of the conventional lens overlaps with the second curved surface region 16, and is therefore shown as a solid line. In this embodiment, the average curvature of the first curved surface region 15 is greater than the average curvature of the second curved surface region 16; that is, the surface of the first curved surface region 15 is more convex than the surface of the second curved surface region 16. The first curved surface region 15 can deflect upward-facing light rays downwards. The function of the second curved surface region 16 is to reduce the deflection of downward-facing light rays, maintaining an emission direction nearly identical to that of a conventional convex lens.

[0032] The multi-focal-length condenser lens provided in this embodiment is applied to a road information display screen, which is suspended on a gantry or "F"-shaped column. In this embodiment, the light source 3 is positioned against the light-incident surface 11 of the lens, with the first direction being vertically downward. That is, the light-emitting surface 12 of the lens is symmetrically arranged with respect to the vertical central axis 14, so that the light emitted from the multi-focal-length condenser lens is symmetrical from left to right. Thus, vehicles located to the left or right of the road information display screen can normally see the information displayed on the screen. Further, refer to... Figure 4 In this embodiment, the light-emitting surface 12 of the lens is distributed with a first curved surface region 15 and a second curved surface region 16 along the first direction, that is, the light-emitting surface 12 of the lens is divided into an upper first curved surface region 15 and a lower second curved surface region 16. The curvature of the upper first curved surface region 15 is greater than the curvature of the lower second curved surface region 16, causing at least a portion of the light emitted from the first curved surface region 15 to be deflected downwards, resulting in a large amount of light being focused on the road surface and greatly improving light utilization.

[0033] Furthermore, it is worth noting that, such as Figure 5 As shown, sunlight enters the multifocal lens from top to bottom at an angle. Most of the sunlight enters the multifocal lens from the first curved area 15. The sunlight entering from the first curved area 15 is also significantly deflected downwards, reducing the amount of sunlight that reaches the light source 3 and preventing the light source 3 from aging prematurely due to ultraviolet radiation.

[0034] In some optional embodiments of this utility model, both the first curved surface region 15 and the second curved surface region 16 are composed of multiple curved surfaces with different curvatures. The curvature of the first curved surface region 15 decreases from its edge to its apex, while the curvature of the second curved surface region 16 increases from its apex to its edge. The apex of the first curved surface region 15 connects to the apex of the second curved surface region 16. The rate of change of the curvature of the first curved surface region 15 is less than the rate of change of the curvature of the second curved surface region 16, and the average curvature of the first curved surface region 15 is greater than the average curvature of the second curved surface region 16. This makes the lens light-emitting surface 12 a free-form surface, facilitating the optimization of the light-emitting effect of the multi-focal length condensing lens during the design process. Specifically, Figure 6 A longitudinal cross-section of a multifocal condenser lens is shown. The lens is divided into multiple sections along a first direction using a line parallel to the lens's principal axis 13. The refraction direction of light is optimized by adjusting the curvature of the curve in each section, ultimately resulting in a lens output surface 12 composed of multiple segments with varying curvature, possessing multiple focal points. In this embodiment, the first surface region 15 has a more convex surface with a greater curvature variation, while the second surface region 16 has a gentler surface with a smaller curvature variation.

[0035] Optionally, the light-emitting surface 12 of the lens is divided into a first curved surface region 15 and a second curved surface region 16 by a first plane 17, wherein the first plane 17 is perpendicular to the first direction. Specifically, as shown... Figure 2 In the illustrated embodiment, the first direction is vertically downward, and the first plane 17 is a horizontal plane, dividing the lens light-emitting surface 12 into a first curved surface region 15 and a second curved surface region 16. This results in the lens light-emitting surface 12 being horizontally asymmetrical. It is worth noting that the first plane 17 is a virtual plane.

[0036] Optionally, the lens principal axis 13 of the convex lens body 1 is on the first plane 17. That is, the light-emitting surface 12 of the lens is divided into an upper first curved surface region 15 and a lower second curved surface region 16 by the plane where the lens principal axis 13 is located.

[0037] Optionally, the light-incident surface 11 of the lens is a plane, and the light-incident surface 11 is not located in the focal region of the first curved surface region 15. Instead, the light-incident surface 11 is located on the side of the focal region 15 away from the light-outceasing curved surface 12 of the lens. Figure 3As shown, in this embodiment, the convex lens body 1 is a plano-convex lens, having a planar lens incident surface 11 and a convex lens exit surface 12. The focal point of the first curved surface region 15 is located in front of the lens incident surface 11. When external sunlight enters the multi-focal-length condensing lens from the first curved surface region 15, the light is significantly deflected downwards. The light first passes through the lens principal axis 13 before reaching the lens incident surface 11, thus partially deflecting the external sunlight and reducing the amount of sunlight illuminating the light source 3, preventing the light source 3 from aging prematurely due to ultraviolet radiation.

[0038] Preferably, the multi-focal-length focusing lens further includes a light guide post 2, which has an incident end face 21 and an exit end face 22. The exit end face 22 of the light guide post 2 is connected to the light incident surface 11 of the lens. Specifically, the cross-section of the light guide post 2 can be triangular, rectangular, polygonal, or circular, etc. In specific applications, the light source 3 is positioned after the incident end face 21. After the light from the light source 3 enters from the incident end face 21 of the light guide post 2, the light guide post 2 guides part or all of the incident light to the exit end face 22 through total internal reflection, thereby achieving uniform mixing of the light from the light source 3.

[0039] Furthermore, the light guide axis 23 of the light guide post 2 is offset relative to the lens axis 13 in the first direction towards the first curved surface region 15. In a specific embodiment, such as Figure 7 As shown, the center of the light source 3 and the main light guide axis 23 of the light guide post 2 are coaxially arranged, with the first direction being vertically downward. The first curved surface region 15 is the upper part of the light-emitting curved surface 12 of the lens, and the second curved surface region 16 is the lower part of the light-emitting surface of the lens. The main light guide axis 23 of the light guide post 2 is shifted parallel to the first direction towards the first curved surface region 15, i.e., the main light guide axis 23 of the light guide post 2 is shifted upward, causing the emission end face 22 of the light guide post 2 to shift upward. This causes most of the light source 3 to be deflected downward through the first curved surface region 15, resulting in a large amount of light being focused onto the road surface. In a specific embodiment, the offset distance depends on the size of the light source 3. The light source 3 is generally a surface light source 3 with a size of 2mm*2mm to 4mm*4mm. Therefore, the distance by which the main light guide axis 23 can be offset relative to the lens main axis 13 is within the range of 0.5 to 2mm.

[0040] Optionally, the light guide post 2 and the convex lens body 1 are integrally formed. In this embodiment, the light guide post 2 and the convex lens body 1 are integrally formed to ensure the overall strength of the multi-focal length condensing lens. Both the light guide post 2 and the convex lens body 1 are made of transparent PC to ensure the light output effect of the multi-focal length condensing lens.

[0041] The second aspect of this utility model discloses a light-emitting component, including a light source 3 and the aforementioned multi-focal-length focusing lens. The light source 3 is disposed on one side of the light-incident surface 11 of the lens, and the light-emitting main axis 31 of the light source 3 is offset parallel to the first direction toward the first curved surface region 15, so that the light source 3 is located on the side of the lens main axis 13 close to the first curved surface region 15.

[0042] like Figure 4 In the illustrated embodiment, the light source 3 can be an LED light source 3 mounted on a PCB board 32. The first direction is vertically downward. The first curved surface region 15 is the upper part of the light-emitting curved surface 12 of the lens, and the second curved surface region 16 is the lower part of the light-emitting surface of the lens. The light-emitting main axis 31 of the light source 3 is offset parallel to the first direction towards the first curved surface region 15, that is, the light-emitting main axis 31 of the light source 3 is offset upward, so that most of the light source 3 is deflected downward through the first curved surface region 15.

[0043] It is worth further explaining that when sunlight passes through the first curved area 15 and is deflected downwards, the light rays first pass through the principal axis 13 of the lens before reaching the light-receiving surface 11 of the lens. Meanwhile, the light source 3 is offset upwards to avoid direct sunlight from reaching it, thus preventing the light source 3 from aging prematurely due to ultraviolet radiation.

[0044] In a specific embodiment, the offset distance depends on the size of the light source 3. The light source 3 is generally a surface light source 3 with a size of 2mm*2mm to 4mm*4mm. Then, the light emission axis 31 of the light source 3 can be offset relative to the lens axis 13 by a distance in the range of 0.5 to 2mm.

[0045] The third aspect of this utility model also discloses an LED display screen, including the aforementioned light-emitting component. When the LED display screen provided by this utility model is applied to a road information display screen, the first direction is vertically downward. The light-emitting surface 12 of the lens of the light-emitting component is symmetrically arranged around the vertical central axis 14, so that the light emitted from the multi-focal-length focusing lens is symmetrical from left to right. Thus, vehicles located to the left or right of the road information display screen can normally see the information displayed on the road information display screen. Further, the light-emitting surface 12 of the lens is distributed along the first direction with a first curved surface region 15 and a second curved surface region 16, that is, the light-emitting surface 12 of the lens is divided into an upper first curved surface region 15 and a lower second curved surface region 16. The curvature of the upper first curved surface region 15 is greater than the curvature of the lower second curved surface region 16, causing at least a portion of the light emitted from the first curved surface region 15 to be deflected downwards, resulting in a large amount of light being focused on the road surface, greatly improving light utilization.

[0046] Furthermore, it is worth noting that, such as Figure 5As shown, sunlight enters the multifocal lens from top to bottom at an angle. Most of the sunlight enters the multifocal lens from the first curved area 15. The sunlight entering from the first curved area 15 is also significantly deflected downwards, reducing the amount of sunlight that reaches the light source 3 and preventing the light source 3 from aging prematurely due to ultraviolet radiation.

[0047] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A multi-focal length condenser lens, characterized in that: The lens includes a convex lens body, which has a light-incident surface, a light-outceasing surface, and a principal axis. The light-outceasing surface is symmetrically arranged about a central axis parallel to a first direction, which is parallel to a plane perpendicular to the principal axis. The light-outceasing surface has a first curved surface region and a second curved surface region distributed along the first direction. The curvature of the first curved surface region is greater than that of the second curved surface region, so that the light emitted from the first curved surface region is at least partially deflected to one side of the second curved surface region.

2. The multi-focal length condenser lens according to claim 1, characterized in that: Both the first and second curved surface regions are composed of multiple curved surfaces with different curvatures. The curvature of the surface in the first curved surface region decreases from the edge to the apex, while the curvature of the surface in the second curved surface region increases from the apex to the edge. The apex of the first curved surface region is connected to the apex of the second curved surface region. The rate of change of the curvature of the first curved surface region is less than the rate of change of the curvature of the second curved surface region. The average curvature of the first curved surface region is greater than the average curvature of the second curved surface region.

3. The multi-focal length condenser lens according to claim 1, characterized in that: The light-emitting surface of the lens is divided into a first surface region and a second surface region by a first plane, and the first plane is perpendicular to the first direction.

4. The multi-focal length condenser lens according to claim 3, characterized in that: The lens spindle is on the first plane.

5. The multi-focal length condenser lens according to claim 1, characterized in that: The light-incident surface of the lens is a plane, and the light-incident surface of the lens is not in the focal region of the first curved surface region. The light-incident surface of the lens is located on the side of the focal region of the first curved surface region that is far away from the light-outceasing surface of the lens.

6. The multi-focal length condenser lens according to claim 1, characterized in that: It also includes a light guide column, which has an incident end face and an exit end face, and the exit end face of the light guide column is connected to the light incident surface of the lens.

7. The multi-focal length condenser lens according to claim 6, characterized in that: The light guide column's main axis is offset relative to the lens's main axis in the first direction towards the first curved surface region.

8. The multi-focal length condenser lens according to claim 6, characterized in that: The light guide post and the convex lens body are integrally formed.

9. A light-emitting component, comprising a light source and a multi-focal-length focusing lens as described in any one of claims 1-8, wherein the light source is disposed on one side of the light-incident surface of the lens, and the light-emitting main axis of the light source is offset parallel to a first direction toward the first curved surface region, such that the light source is located on the side of the lens main axis closer to the first curved surface region.

10. An LED display screen, including the light-emitting component as described in claim 9.

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