Lens

Abstract

The utility model relates to the technical field of illumination, in particular to a lens which comprises a lens body, the lens body comprises an incidence cavity, a first incidence face is arranged on the top of the incidence cavity, the side wall of the incidence cavity is arranged to be a second incidence face, the second incidence face is of a curved surface structure, and the second incidence face protrudes towards the middle of the incidence cavity. The incident cavity is of a circular truncated cone structure, the radius of the cross section of the incident cavity is gradually reduced from bottom to top, the top of the lens body is provided with a concave first emergent face, the first emergent face protrudes towards the interior of the lens body, and the side wall of the lens body is arranged to be a reflecting face. The second incident plane of the lens body is the curved surface protruding towards the middle of the incident cavity, and under the condition of light rays of the same incident angle, the distance from a light spot formed on the reflecting plane to the emergent plane is smaller than that from a light spot formed on the reflecting plane to the emergent plane of a traditional lens. Compared with a traditional lens body, the color difference is small, and the light color consistency is improved.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, and in particular to a lens. Background Technology

[0002] With the continuous development of lighting technology, LED (Light Emitting Diode) has become a new type of light source. Due to its many advantages such as low energy consumption, long lifespan, fast response speed, small size, environmental friendliness, and ability to emit multiple colors, it has gradually replaced traditional incandescent lamps, fluorescent lamps, and is widely used in various fields such as road lighting, commercial lighting, indoor lighting, vehicle lights, and backlights.

[0003] However, although LED light sources have excellent performance, many LED lamps on the market at present still have significant optical quality problems, especially the poor quality of light spots, which are often manifested as uneven distribution of main and secondary light spots, blurred edges, uneven brightness, and stray light. Such problems not only severely affect the uniformity and visual aesthetics of lighting, but also, with prolonged use of LED lights with poor light spot quality, can lead to visual fatigue and irreversible vision damage. This is particularly pronounced in scenarios with high lighting quality requirements (such as office, reading, and medical lighting). Existing lenses have cylindrical entrance cavities, resulting in straight cross-sections of the cavity sidewalls. When light enters the cavity, it contacts the sidewalls. Because the normal direction is the same at every point on the straight cross-section of the entrance cavity sidewall, the angle of incidence of the light entering the lens after reflection is limited. This causes the light to concentrate its propagation path after entering the lens body, making it easier for the light to pass through the lens's exit area during secondary reflection. This creates interlaced interference stripes of strong and weak light with the light passing through the lens's entrance surface, resulting in stray light and excessive color difference in the illuminated area, thus degrading the quality of the light spot. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of traditional lenses in the prior art, such as the limited range of incident angle changes after light enters the lens and comes into contact with the incident surface, resulting in stray light and excessive chromatic aberration in the light spot of the lens illumination area, and to provide a new type of lens.

[0005] In a first aspect, the present invention provides a lens, including a lens body, the lens body including an incident cavity, a first incident surface being provided at the top of the incident cavity, a second incident surface being provided on the sidewall of the incident cavity, the second incident surface being a curved surface structure and protruding towards the center of the incident cavity, and the incident cavity being a frustum structure, the cross-sectional radius of the incident cavity gradually decreasing from the bottom to the top;

[0006] The top of the lens body is provided with a concave first emission surface, and the first emission surface is concave.

[0007] The sidewalls of the lens body are configured as reflective surfaces.

[0008] This invention provides a lens with an incident cavity in the lens body for light to enter the lens. The sidewall of the incident cavity is configured as a second incident surface, and the second incident surface is configured as a curved structure convex towards the center of the incident cavity. The incident cavity is a frustum structure with a cross-sectional radius gradually decreasing from bottom to top. When light is incident on the second incident surface, it undergoes refraction and reflection, generating refracted and reflected rays. When light comes into contact with the second incident surface, refracted rays are generated. These refracted rays pass through the second incident surface and enter the lens, forming a light spot on the reflecting surface. Compared with conventional lenses, the second incident surface of the lens body of this invention is a curved surface convex towards the center of the incident cavity. Under the same incident angle, the distance from the light spot formed on the reflecting surface to the exit surface of this invention is closer than that of the light spot formed on the reflecting surface of a conventional lens. This results in a smaller chromatic difference in the lens body of this invention compared to conventional lenses, and improved color consistency.

[0009] When light comes into contact with the second incident surface and is reflected, it is reflected again by the second incident surface. The reflected light then comes into contact with the second incident surface again inside the incident cavity. Since the second incident surface is a curved surface convex towards the center of the incident cavity, its normal position is not fixed. When the reflected light comes into contact with the second incident surface again, it enters the lens body. At this time, the incident angle of the reflected light entering the lens body increases. After the reflected light enters the lens body, it undergoes a second reflection on the reflecting surface. Because the incident angle of the reflected light increases, the light can be directly transmitted out of the reflecting surface when it undergoes a second reflection, reducing stray light when the lens illuminates.

[0010] Preferably, the angle α between the optical axis of the lens body and the line connecting the vertex and the bottom of the second incident surface is in the range of 5° to 50°.

[0011] Preferably, the bottom of the first emission surface is provided with a raised second emission surface, and the second emission surface is a convex surface.

[0012] Preferably, a third emission surface is provided at the top of the second emission surface, and the third emission surface has a planar structure.

[0013] The third exit surface is a planar structure on the second exit surface. Due to the characteristic that the planar structure does not change the light propagation path, the light rays that pass through the first incident surface and are incident on the third exit surface will not change their own propagation path when passing through the third exit surface. This is beneficial to the divergence of light and helps to reduce chromatic aberration.

[0014] Preferably, the second exit surface and the third exit surface are provided with a plurality of spherical microlenses.

[0015] By setting up spherical microlenses, the light spots formed uniformly from the second and third exiting surfaces are approximately the same size, thus reducing chromatic aberration.

[0016] Preferably, the reflective surface is covered with scales.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. This utility model provides a lens in which an incident cavity is provided in the lens body for light to enter the lens. The sidewall of the incident cavity is set as a second incident surface, and the second incident surface is set as a curved surface structure convex towards the center of the incident cavity. When light is incident on the second incident surface, it is refracted and reflected, generating refracted light and reflected light. When light comes into contact with the second incident surface, it generates refracted light. The refracted light passes through the second incident surface and enters the lens, forming a light spot on the reflecting surface. Compared with conventional lenses, the second incident surface of the lens body of this utility model is a curved surface convex towards the center of the incident cavity. Under the same incident angle, the distance from the light spot formed on the reflecting surface to the exit surface of this utility model is closer than that of the light spot formed on the reflecting surface to the exit surface of conventional lenses. This makes the chromatic difference of the lens body of this utility model smaller than that of conventional lenses, and improves the consistency of light color.

[0019] When light comes into contact with the second incident surface and is reflected, it is reflected again by the second incident surface. The reflected light then comes into contact with the second incident surface again inside the incident cavity. Since the second incident surface is a curved surface convex towards the center of the incident cavity, its normal position is not fixed. When the reflected light comes into contact with the second incident surface again, it enters the lens body. At this time, the incident angle of the reflected light entering the lens body increases. After the reflected light enters the lens body, it undergoes a second reflection on the reflecting surface. Because the incident angle of the reflected light increases, the light can be directly transmitted out of the reflecting surface when it undergoes a second reflection, reducing stray light when the lens illuminates. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the lens structure of this utility model;

[0021] Figure 2 In this utility model Figure 1 Enlarged view of part A;

[0022] Figure 3 In this utility model Figure 1 Enlarged view of part B;

[0023] Figure 4This is a cross-sectional view of the lens of this utility model;

[0024] Figure 5 This is a top view of the lens of this utility model;

[0025] Figure 6 This is a schematic diagram of the light emission from the third light-emitting surface of this utility model;

[0026] Figure 7 This is a schematic diagram of the light emission from the second and third light-emitting surfaces of this utility model;

[0027] Figure 8 This is a schematic diagram of the secondary reflection of the reflected light rays according to this utility model;

[0028] Figure 9 This is a schematic diagram of the included angle α in this utility model;

[0029] Figure 10 This is a schematic diagram of the path of the refracted light rays according to this utility model;

[0030] Figure 11 This is a schematic diagram of the path of refracted light rays in a traditional lens in this utility model.

[0031] In the figure, the markings are: 1-lens body; 2-incident cavity; 21-first incident surface; 22-second incident surface; 3-first exit surface; 4-second exit surface; 5-reflecting surface; 6-third exit surface; 7-spherical microlens; 8-rhomboid microlens. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0033] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0035] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0036] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0037] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0038] Example 1

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The lens shown has an incident cavity 2 at the bottom of the lens body 1, a first incident surface 21 at the top of the incident cavity 2, and a second incident surface 22 on the side wall of the incident cavity 2. The first incident surface 21 and the second incident surface 22 are used to allow light to propagate from the incident cavity 2 into the lens body 1. The second incident surface 22 is configured as a curved surface structure that bulges toward the center of the incident cavity 2, and the side wall of the lens body 1 is configured as a reflecting surface 5. When the light in the incident cavity 2 comes into contact with the second incident surface 22, it generates reflected light and refracted light. When the light in the incident cavity 2 comes into contact with the second incident surface 22 and generates refracted light, the second incident surface 22 is configured as a curved surface structure that bulges toward the center of the incident cavity 2, so that the light spot formed by the refracted light on the reflecting surface 5 is closer to the exit surface, reducing the chromatic aberration in the light spot area and improving the consistency of light color.

[0040] When light comes into contact with the second incident surface 22 and is reflected, it is reflected again through the second incident surface 22. The reflected light then comes into contact with the second incident surface 22 again inside the incident cavity 2. Since the second incident surface 22 is a curved surface that bulges towards the center of the incident cavity 2, its normal position is not fixed. When the reflected light comes into contact with the second incident surface 22 again, it enters the interior of the lens body 1. At this time, the incident angle of the reflected light entering the lens body 1 increases. After the reflected light enters the lens body 1, it undergoes a second reflection on the reflecting surface 5. Because the incident angle of the reflected light increases, the light can be directly transmitted out of the reflecting surface 5 when it undergoes a second reflection, reducing stray light when the lens is irradiated.

[0041] In one or more embodiments, the incident cavity 2 has a frustum-shaped structure, and the top radius of the incident cavity 2 is smaller than the bottom radius of the incident cavity 2, such as... Figure 1 and Figure 4 As shown.

[0042] In one or more embodiments, the angle α between the optical axis of the lens body 1 and the line connecting the vertex and the bottom point of the second incident surface 22 ranges from 5° to 50°. Figure 9 As shown.

[0043] In one or more embodiments, the top of the lens body 1 is provided with a concave first exit surface 3, the first exit surface 3 being concave, and the bottom of the first exit surface 3 is provided with a convex second exit surface 4, the second exit surface 4 being convex. Figure 1 , Figure 4 and Figure 5 As shown.

[0044] In one or more embodiments, a third exiting surface 6 is provided at the top of the second exiting surface 4. The third exiting surface 6 is a planar structure. The planar structure of the third exiting surface 6 on the second exiting surface 4, by virtue of its characteristic of not changing the light propagation path, ensures that the light rays passing through the first incident surface 21 and heading towards the third exiting surface 6 do not change their propagation path when passing through the third exiting surface 6. This is beneficial for light divergence and helps reduce chromatic aberration. Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown.

[0045] In one or more embodiments, a plurality of spherical microlenses 7 are provided on the second emission surface 4 and the third emission surface 6. By providing spherical microlenses 7, the light spots formed from the second emission surface 4 and the third emission surface 6 are approximately the same size, thereby reducing color difference.

[0046] Furthermore, the reflective surface 5 is covered with scales 8, such as Figure 2 , Figure 3 and Figure 7 As shown;

[0047] Furthermore, the shape of the scales 8 is preferably rhomboid.

[0048] The following table shows a comparison of the chromatic aberration between a conventional lens and the lens of this invention under the same lighting conditions:

[0049] Weighted average of color differences du′v′ (T) Traditional lenses 0.00698 This utility model lens 0.00371

[0050] As shown in the table above, under the same lighting conditions, the weighted average value of the chromatic difference du′v′ of the traditional lens is 0.00698, while the weighted average value of the chromatic difference du′v′ of the lens of this invention is 0.00371. In comparison, the weighted average value of the chromatic difference of the lens of this invention is reduced by about 46.8%, thus reducing the chromatic difference.

[0051] Example 2

[0052] This embodiment 2 describes the path of the reflected light in the lens body 1 of embodiment 1. This embodiment only describes the path of one reflected light.

[0053] Specifically, assuming the light-emitting point is P1, light is emitted from P1 into the incident cavity 2. After the light emitted from P1 first contacts the second incident surface 22, it forms a light spot P2 on the second incident surface 22. The light then reflects at light spot P2, and the reflected light contacts the second incident surface 22 a second time within the incident cavity 2, forming a light spot P3. The light is refracted at light spot P3 (the angle of incidence increases after reflection) and enters the lens body 1. After passing through the lens body 1, the light forms a light spot P4 on the reflecting surface 5. At this point, the light undergoes a second reflection at light spot P4. Because the angle of incidence increases when the light enters the lens body 1 at light spot P3, the light can be directly transmitted through the reflecting surface 5 during the second reflection at light spot P4, thereby reducing stray light appearing in the lens body 1 during use. Figure 8 As shown.

[0054] Example 3

[0055] like Figure 10 and Figure 11 The example shown in Example 3 illustrates the path of refracted light rays in the lens body of Example 1.

[0056] This embodiment describes the paths of the ten refracted rays of this invention and the paths of the ten refracted rays of a conventional lens, wherein the ten refracted rays in this invention are B1 B2, B3 B4, B5 B6, B7 B8, B9 B 10 B 11 B 12 B 13 B 14 B 15 B 16 B 17 B 18 and B 19 B 20 The ten refracted rays of a traditional lens are B1 B′2, B3 B′4, B5 B′6, B7 B′8, B9 B′ 10 B 11 B′ 12 B 13 B′ 14 B 15 B′ 16 B 17 B′ 18 and B 19 B′ 20 ;

[0057] It is assumed that the light ray emitted from the light-emitting point P1 to the second incident surface in this invention is the same light ray emitted to the incident surface of the conventional lens.

[0058] The angles between the ten refracted rays of this invention and the lens body are shown in the table below:

[0059]

[0060] As shown in the table above, in this invention, the angle between light rays B1 and B2 and the optical axis of lens body 1 is 53°, the angle between light rays B3 and B4 and the optical axis of lens body 1 is 53.3°, the angle between light rays B5 and B6 and the optical axis of lens body 1 is 53.5°, the angle between light rays B7 and B8 and the optical axis of lens body 1 is 55°, and the angle between light rays B9 and B2 is 53.3°. 10 The angle between the optical axis and the lens body 1 is 55.7°, and the ray B... 11 B 12 The angle between the optical axis of the lens body 1 and the optical axis is 58°, and the ray B 13 B 14 The angle between the optical axis of the lens body 1 and the optical axis is 59°, and the ray B 15 B 16 The angle between the optical axis of the lens body 1 and the optical axis is 62°, and the ray B 17 B 18 The angle between the optical axis of the lens body 1 and the optical axis is 64°, and the ray B 19 B 20 The angle between the optical axis and the lens body 1 is 66°.

[0061] The angles between the ten refracted rays of a traditional lens and the lens body are shown in the table below:

[0062]

[0063]

[0064] As shown in the table above, for a conventional lens (an incident cavity with a straight incident surface cross-section), the angle between ray B1 B′2 and the optical axis of lens body 1 is 53°, the angle between ray B3 B′4 and the optical axis of lens body 1 is 54.6°, the angle between ray B5 B′6 and the optical axis of lens body 1 is 56.5°, the angle between ray B7 B′8 and the optical axis of lens body 1 is 59°, and the angle between ray B9 B′... 10 The angle between the light ray B and the optical axis of the lens body 1 is 61°. 11 B′ 12 The angle between the light ray B and the optical axis of the lens body 1 is 63.5°. 13 B′ 14 The angle between the light ray B and the optical axis of the lens body 1 is 66°. 15 B′ 16 The angle between the light ray B and the optical axis of the lens body 1 is 69°. 17 B′18 The angle between the light ray B and the optical axis of the lens body 1 is 73°. 19 B′ 20 The angle between the optical axis and the lens body 1 is 77°.

[0065] In summary, under the same incident light conditions, the light refracted by the second incident surface 22 in this invention has an angle with the optical axis smaller than the angle between the refracted light and the optical axis in a traditional lens. Because the angle is small, the light spot formed by the refracted light on the reflecting surface 5 is closer to the light emitting surface, thereby reducing the color difference in the light spot area and improving the consistency of light color.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lens, characterized in that, The lens includes a lens body (1), which includes an incident cavity (2). The top of the incident cavity (2) is provided with a first incident surface (21), and the sidewall of the incident cavity (2) is set as a second incident surface (22). The second incident surface (22) is a curved surface structure and protrudes towards the middle of the incident cavity (2). The incident cavity (2) is frustum-shaped, and the cross-sectional radius of the incident cavity (2) gradually decreases from the bottom to the top. The lens body (1) has a concave first exit surface (3) at the top, and the first exit surface (3) is concave. The sidewall of the lens body (1) is configured as a reflecting surface (5).

2. A lens according to claim 1, characterized in that, The angle α between the optical axis of the lens body (1) and the line connecting the vertex and the bottom of the second incident surface (22) ranges from 5° to 50°.

3. A lens according to any one of claims 1-2, characterized in that, The bottom of the first emission surface (3) is provided with a raised second emission surface (4), and the second emission surface (4) is a convex surface.

4. A lens according to claim 3, characterized in that, The second exit surface (4) has a third exit surface (6) at its top, and the third exit surface (6) is a planar structure.

5. A lens according to claim 4, characterized in that, The second exit surface (4) and the third exit surface (6) are provided with a plurality of spherical microlenses (7).

6. A lens according to claim 5, characterized in that, The reflective surface (5) is covered with scales (8).

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