Lens and lamp
By setting a reflective structure on the side of the lens housing cavity facing away from the first incident light surface, the problem of abnormal light spots forming in the illumination area by the TIR lens is solved, the central light intensity is improved, and a better focused lighting effect is achieved.
Patent Information
- Application Number
- CN202520469140.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-03-17
AI Technical Summary
Existing TIR lenses create abnormal light spots in the illumination area, with insufficient central light intensity, making it difficult to achieve efficient focused lighting effects.
A reflective structure is provided on the side of the lens cavity facing away from the first light-incident surface. The reflective structure includes a first reflective surface and a second reflective surface, forming a pyramidal reflective structure. This allows light to be reflected back into the cavity through the reflective structure and re-enter the lens. Finally, the light exits from the light-out surface through the total internal reflection surface.
The central light intensity of the lens was increased, the secondary light spot was suppressed, and a better focused lighting effect was achieved.
Smart Images
Figure CN223840218U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a lens and a lamp, belonging to the field of lighting. Background Technology
[0002] Small-angle lighting fixtures are widely used in home lighting, commercial lighting, and museum lighting. The most important evaluation indicator for accent lighting is the center luminous intensity. Only a lighting fixture with high center luminous intensity can make the illuminated object stand out from a complex background.
[0003] Common optical solutions for small-angle lighting fixtures include reflector solutions, multi-stage plano-convex lens solutions, and TIR lens (total internal reflection lens) solutions. Among these, the reflector solution, because a portion of the light rays bypasses the reflector and exits directly, creates a noticeable secondary light spot, which is ineffective for accent lighting. The multi-stage plano-convex lens solution has low optical efficiency and requires high assembly precision. Therefore, the TIR lens solution has become the mainstream small-angle solution in the market.
[0004] The optical path of a TIR lens is typically divided into two parts: light rays from the edge undergo total internal reflection and are emitted from the light-emitting surface; according to the principle of conservation of light spread, the beam angle of this part of the light is relatively small. Light rays from the middle part undergo refraction and are emitted from the light-emitting surface; according to the principle of conservation of light spread, the beam angle of this part of the light is relatively large. Clearly, existing TIR lenses will create abnormal light spots in the illuminated area.
[0005] In view of this, it is indeed necessary to improve the structure of existing TIR lenses to solve the above problems. Utility Model Content
[0006] The purpose of this invention is to provide a lens that allows light rays emitted from the center to also exit from the side total reflection surface, thereby enhancing the center light intensity of the entire lamp and achieving a better focused lighting effect.
[0007] To achieve the above objectives, this utility model provides a lens, comprising:
[0008] The light-incident surface is located at the beginning of the optical axis of the lens and includes a first light-incident surface and a second light-incident surface disposed around the first light-incident surface. The first light-incident surface and the second light-incident surface together define a cavity for placing a light source.
[0009] The light-emitting surface is located at the end of the optical axis of the lens;
[0010] A total internal reflection surface, connecting the second incident surface and the exiting surface, to reflect light rays incident from the second incident surface to the exiting surface; and
[0011] A reflective structure is provided on the side of the accommodating cavity opposite to the first light-incident surface, used to reflect the light entering from the first light-incident surface back into the accommodating cavity, so that the light can re-enter the lens from the second light-incident surface.
[0012] Optionally, the reflective structure includes a first reflective surface and a second reflective surface that are both inclined relative to the optical axis. The first reflective surface and the second reflective surface are connected to each other to form a pyramidal reflective structure. The first reflective surface is configured to reflect light rays incident from the first incident surface to the second reflective surface, and the second reflective surface is configured to reflect light rays emitted from the first reflective surface to the first incident surface and enter the accommodating cavity.
[0013] Optionally, in the direction of optical axis projection, the projection of the first incident surface is covered by the projections of the first reflecting surface and the second reflecting surface.
[0014] Optionally, multiple sets of the first and second reflective surfaces are provided, and a pyramidal array is formed on the side of the reflective structure facing the first incident light surface.
[0015] Optionally, the first light-incident surface is configured to protrude into the receiving cavity.
[0016] Optionally, the second incident surface is tilted relative to the optical axis.
[0017] Optionally, the total reflection surface is set as a curved surface relative to the optical axis.
[0018] Optionally, the light-emitting surface is a circular plane, and the periphery of the light-emitting surface is connected to a total reflection surface.
[0019] The purpose of this utility model is also to provide a lamp with a strong central light intensity, which can achieve the effect of focused lighting.
[0020] To achieve the above objectives, this utility model provides a lamp, comprising:
[0021] light source;
[0022] The aforementioned lens has a light source housed within its accommodating cavity;
[0023] In this system, the light emitted from the light source enters the lens through the incident light surface, and exits from the exit light surface through the light path control of the reflection structure and the total reflection surface.
[0024] Optionally, the light source includes a light-emitting part and a reflector disposed outside the light-emitting part. Both the light-emitting part and the reflector are housed in a receiving cavity, and the reflector is configured to reflect the light reflected back to the receiving cavity to a second light-incident surface.
[0025] The beneficial effects of this invention are as follows: The lens of this invention, by setting a reflective structure on the side of the accommodating cavity opposite to the first light-incident surface, allows light rays entering from the first light-incident surface to be reflected back into the accommodating cavity and re-enter the lens from the second light-incident surface. Finally, after being reflected by the total internal reflection surface, the light rays exit from the emitting surface. Compared to existing technologies, the lens of this invention enables the light rays emanating from the center to also exit from the side total internal reflection surface, thereby increasing the center light intensity of the entire lamp and achieving a better focused lighting effect. Attached Figure Description
[0026] Figure 1 This is a perspective view of a lamp according to a preferred embodiment of the present invention.
[0027] Figure 2 yes Figure 1 The diagram shows a cross-sectional view of the lamp.
[0028] Figure 3 yes Figure 2 The light path diagram at the edge of the lamp is shown.
[0029] Figure 4 yes Figure 2 The light path diagram at the middle position of the lamp shown.
[0030] Figure 5 This is a cross-sectional view of a lamp according to another embodiment of the present invention.
[0031] Figure 6 yes Figure 5 The light path diagram of the lamp shown.
[0032] Figure label:
[0033] 100-Lamp fixture, 10-Lens, 11-Incident surface, 111-First incident surface, 112-Second incident surface, 12-Emitting surface, 13-Total reflection surface, 14-Accommodation cavity, 15-Reflective structure, 151-First reflecting surface, 152-Second reflecting surface, 20-Light source. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0035] like Figures 1 to 6 As shown, this utility model discloses a lamp 100, which can be an indoor or outdoor lighting fixture such as a dining pendant lamp or a floodlight.
[0036] like Figure 1 and Figure 2As shown, the luminaire 100 includes a light source 20 and a lens 10 corresponding to the light source 20. The lens 10 forms the light distribution system of the luminaire 100, which can generate emitted light with strong central light intensity and no abnormal light spots, meeting the requirements of small-angle luminaires for central light intensity and achieving better focused lighting effect. The light source 20 can emit light of corresponding color and brightness according to the lighting needs and illuminate the lens 10. The lens 10 performs optical processing (such as reflection and refraction) on the light from the light source 20, thereby forming emitted light with the required central light intensity and no abnormal light spots on the illuminated surface.
[0037] In this embodiment, the lamp 100 also includes a lamp housing, a heat sink, a driver assembly, and a lampshade. The lamp housing serves as the main body of the lamp 100, housing the light source 20, lens 10, heat sink, driver assembly, and other lamp components. The lampshade is detachably mounted on the lamp housing, thus encapsulating the light source 20, lens 10, heat sink, driver assembly, and other lamp components within the lamp housing. Since the main improvement of this invention lies in the lens 10, the specific structures of the heat sink, driver assembly, lamp housing, and lampshade will not be described or limited in the following description.
[0038] The light source 20 includes a light-emitting part and a reflector covered outside the light-emitting part. Both the light-emitting part and the reflector are located inside the lens 10, so that the light emitted by the light-emitting part can shine onto the lens 10 and be reflected or refracted by the surface of the lens 10.
[0039] In this embodiment, the lens 10 is generally frustum-shaped and can be manufactured from optical-grade PMMA material using an injection molding process. The lens 10 includes an incident surface 11, an exiting surface 12, and a total internal reflection surface 13. The incident surface 11 is located at the beginning of the optical axis of the lens 10, allowing light to enter the lens 10; the exiting surface 12 is located at the end of the optical axis of the lens 10, allowing light to exit the lens 10; the incident surface 11 and the exiting surface 12 are connected by the total internal reflection surface 13, that is, the incident surface 11, the total internal reflection surface 13, and the exiting surface 12 are connected sequentially to form the outer surface of the lens 10.
[0040] Lens 10 has a receiving cavity 14 for housing the light source 20. The receiving cavity 14 is located at the beginning end of the optical axis of lens 10 (i.e., the end with the smaller area). The light source 20 is aligned with the receiving cavity 14, and both the light-emitting part and the reflector of the light source 20 are housed within the receiving cavity 14. The light-incident surface 11 surrounds the receiving cavity 14, so that the light emitted by the light source 20 can illuminate the light-incident surface 11, enter the interior of lens 10 through the light-incident surface 11, and then be controlled by the light path of the reflection structure 15 and the total reflection surface 13 before finally exiting from the light-emitting surface 12.
[0041] Optionally, the light-incident surface 11 includes a first light-incident surface 111 and a second light-incident surface 112 disposed around the first light-incident surface 111. The first light-incident surface 111 and the second light-incident surface 112 together define the accommodating cavity 14. In this embodiment, the first light-incident surface 111 protrudes into the accommodating cavity 14, so that some of the light emitted by the light source 20 can converge toward the center of the light-emitting surface 12 after illuminating the first light-incident surface 111. The second light-incident surface 112 is inclined relative to the optical axis and can be an inclined plane as a whole, so that some of the light emitted by the light source 20 can be refracted after illuminating the second light-incident surface 112 and incident on the total reflection surface 13. After total reflection at the total reflection surface 13, it is incident on the light-emitting surface 12, and finally refracted again at the light-emitting surface 12 before being emitted.
[0042] The total internal reflection surface 13 is the side surface of the lens 10, which connects the second incident surface 112 and the exiting surface 12. Optionally, the total internal reflection surface 13 is curved relative to the optical axis to reflect the light rays incident from the second incident surface 112 to the exiting surface 12. That is, it reflects the light rays refracted by the second incident surface 112 and directs the reflected light rays toward the exiting surface 12.
[0043] The light-emitting surface 12 is located at the end of the optical axis of the lens 10 (i.e., the end with the larger area), and its periphery is connected to the total internal reflection surface 13. The light-emitting surface 12 is approximately a circular plane and is used to refract the light emitted by the light source 20.
[0044] Lens 10 also includes a reflective structure 15, which is located on the side of the accommodating cavity 14 opposite to the first light-incident surface 111. This reflective structure 15 reflects light rays entering from the first light-incident surface 111 back into the accommodating cavity 14, allowing the light rays to re-enter the lens 10 from the second light-incident surface 112. In other words, light rays illuminating the first light-incident surface 111, after refraction, no longer exit directly from the light-exiting surface 12, but instead directly illuminate the reflective structure 15. After reflection by the reflective structure 15, the light rays return to the accommodating cavity 14, are reflected by the light source 20, and then re-enter the lens 10 from the second light-incident surface 112. Finally, after total internal reflection by the total internal reflection surface 13, the light rays exit from the light-exiting surface 12. This configuration not only effectively enhances the central light intensity of the lens 10 but also effectively suppresses secondary light spots, achieving the effect of improved focused illumination.
[0045] Specifically, the reflective structure 15 includes a first reflective surface 151 and a second reflective surface 152, both inclined relative to the optical axis, which are interconnected to form a pyramidal reflective structure. Either the first reflective surface 151 or the second reflective surface 152 is configured to reflect light incident from the first incident surface 111 to the other of the first reflective surface 151 and the second reflective surface 152. Further, the first reflective surface 151 and the second reflective surface 152 are configured to reflect light incident from the first incident surface 111 back to the first incident surface 111 and into the receiving cavity 14.
[0046] In this embodiment, the first reflecting surface 151 is configured to reflect light incident from the first light-incident surface 111 to the second reflecting surface 152; the second reflecting surface 152 is configured to reflect light emitted from the first reflecting surface 151 back to the first light-incident surface 111 and into the receiving cavity 14. The reflector of the light source 20 is configured to reflect light reflected back to the receiving cavity 14 to the second light-incident surface 112. Of course, because of the uncertainty of the light emission direction, the first reflecting surface 151 in this embodiment can also perform the function of the second reflecting surface 152, and the second reflecting surface 152 can also perform the function of the first reflecting surface 151, to ensure that all light incident from the first light-incident surface 111 is reflected back into the receiving cavity 14.
[0047] In this embodiment, a set of pyramidal reflective structures is provided, and in the direction of optical axis projection, the projection of the first incident surface 111 is covered by the projection of the first reflective surface 151 and the second reflective surface 152. In this way, it can be ensured that all the light rays incident from the first incident surface 111 can reach the first reflective surface 151 or the second reflective surface 152, thereby improving the light reflectivity.
[0048] like Figure 3 As shown, when a portion of the light emitted by the light source 20 is incident on the second incident surface 112 (such as light ray ①), the light ray is refracted at the second incident surface 112 and then incident on the total reflection surface 13 (such as light ray ②), and after total reflection at the total reflection surface 13, it is incident on the exiting surface 12 (such as light ray ③), and then refracted at the exiting surface 12 before being emitted.
[0049] like Figure 4As shown, when a portion of the light emitted by the light source 20 is incident on the first light-incident surface 111 (e.g., light ray ①), this portion of the light is refracted at the first light-incident surface 111 and then incident on the first reflecting surface 151 (e.g., light ray ②). After being reflected by the first reflecting surface 151, it is incident on the second reflecting surface 152 (e.g., light ray ③). After being reflected by the second reflecting surface 152, it is incident on the first light-incident surface 111 (e.g., light ray ④). After being refracted at the first light-incident surface 111, it is incident on the reflector of the light source 20 (e.g., light ray ⑤). After being reflected by the reflector, it is incident on the second light-incident surface 112 (e.g., light ray ⑥). After being refracted at the second light-incident surface 112, it is incident on the total reflection surface 13 (e.g., light ray ⑦). After total reflection at the total reflection surface 13, it is incident on the light-exiting surface 12 (e.g., light ray ⑧). After being refracted at the light-exiting surface 12, it is emitted.
[0050] like Figure 5 and Figure 6 As shown, in another embodiment of this utility model, multiple sets of pyramidal reflective structures are provided. In this case, multiple sets of the first reflective surface 151 and the second reflective surface 152 are provided, and a pyramidal array is formed on the side of the reflective structure 15 facing the first light-incident surface 111, which can further improve the light reflectivity. At this time, the light path trace of the light source 20 illuminating the second light-incident surface 112 is... Figure 3 The optical path traces are the same as those in the previous section. The optical path traces of the light source 20 illuminating the first incident surface 111 are the same as those in the previous section. Figure 4 The optical path routing is the same as in the previous section, so it will not be described again here.
[0051] In summary, the lens 10 of this invention, by providing a reflective structure 15 on the side of the accommodating cavity 14 facing away from the first light-incident surface 111, allows light rays entering from the first light-incident surface 111 to be reflected back into the accommodating cavity 14 by the reflective structure 15, and then re-enter the lens 10 from the second light-incident surface 112. Finally, after being reflected by the total reflection surface 13, the light rays exit from the light-emitting surface 12. Compared to the prior art, the lens 10 of this invention allows the light rays emanating from the center to also exit from the side total reflection surface 13, which not only improves optical efficiency and increases the center light intensity of the entire lamp, but also effectively suppresses secondary light spots, achieving a better focused lighting effect.
[0052] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model.
Claims
1. A lens, characterized in that, include: The light-incident surface (11) is located at the starting end of the optical axis of the lens (10), and includes a first light-incident surface (111) and a second light-incident surface (112) arranged around the first light-incident surface (111). The first light-incident surface (111) and the second light-incident surface (112) together define a receiving cavity (14) for placing the light source (20). The light-emitting surface (12) is located at the end of the optical axis of the lens (10); A total internal reflection surface (13) connects the second incident light surface (112) and the exiting light surface (12) to reflect light rays incident from the second incident light surface (112) to the exiting light surface (12); and A reflective structure (15) is provided on the side of the accommodating cavity (14) facing away from the first light-incident surface (111) to reflect the light entering from the first light-incident surface (111) back to the accommodating cavity (14), so that the light can re-enter the lens (10) from the second light-incident surface (112).
2. The lens according to claim 1, characterized in that, The reflective structure (15) includes a first reflective surface (151) and a second reflective surface (152) that are both inclined relative to the optical axis. The first reflective surface (151) and the second reflective surface (152) are connected to each other to form a pyramidal reflective structure. The first reflective surface (151) is configured to reflect light rays incident from the first light-incident surface (111) to the second reflective surface (152). The second reflective surface (152) is configured to reflect light rays emitted from the first reflective surface (151) to the first light-incident surface (111) and into the receiving cavity (14).
3. The lens according to claim 2, characterized in that, In the direction of optical axis projection, the projection of the first incident surface (111) is covered by the projections of the first reflecting surface (151) and the second reflecting surface (152).
4. The lens according to claim 2, characterized in that, The first reflective surface (151) and the second reflective surface (152) are provided in multiple sets, and a pyramidal array is formed on the side of the reflective structure (15) facing the first light-incident surface (111).
5. The lens according to claim 1, characterized in that, The first light-incident surface (111) protrudes into the accommodating cavity (14).
6. The lens according to claim 1, characterized in that, The second light-incident surface (112) is tilted relative to the optical axis.
7. The lens according to claim 1, characterized in that, The total reflection surface (13) is curved relative to the optical axis.
8. The lens according to claim 1, characterized in that, The light-emitting surface (12) is a circular plane, and the periphery of the light-emitting surface (12) is connected to the total reflection surface (13).
9. A lamp, characterized in that, include: Light source (20); The lens (10) as claimed in any one of claims 1 to 8, wherein the light source (20) is housed in the receiving cavity (14) of the lens (10); The light emitted by the light source (20) enters the lens (10) through the light-incident surface (11), and exits from the light-exit surface (12) through the light path control of the reflection structure (15) and the total reflection surface (13).
10. The lamp according to claim 9, characterized in that, The light source (20) includes a light-emitting part and a reflector disposed outside the light-emitting part. Both the light-emitting part and the reflector are housed in the receiving cavity (14). The reflector is configured to reflect light reflected back to the receiving cavity (14) to the second light-incident surface (112).