Lens

Abstract

The utility model discloses a lens which comprises a cover body and a lens body. Wherein the lens body comprises an incident plane; the emergent surface is opposite to the incident surface; the fully reflecting surface is connected between the incident surface and the emergent surface; the curved surface is located in the lens body and located between light paths of the incident surface and the total reflection surface, the lens body is provided with a center line passing through the incident surface and the emergent surface, and the curved surface rotates around the center line of the lens body to form a lens inner hole; wherein a part of light beams entering the curved surface from the incident surface are refracted to enter the fully reflecting surface, and the other part of light beams entering the curved surface from the incident surface are reflected out of the lens body along the incident surface. According to the utility model, the curved surface is arranged in the lens body, and the curved surface is positioned between the light paths of the incident surface and the total reflection surface, so that a part of light beams incident to the curved surface from the incident surface are reflected out of the lens body along the incident surface, the influence of stray light on the light quality is reduced, and the light spot quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of non-imaging lighting, in particular to a lens. Background Art

[0002] With the continuous development of the LED industry, people's demand for healthy, efficient and comfortable green lighting is growing, which has become the main direction of lamp research and development. Consumers are no longer only concerned about the lighting angle of lamps, but more about the quality of light. The fade state of the light spot and the stratification of the tangential light of the lamp are important indicators to measure the quality of the light spot.

[0003] like Figure 1 The inner hole of the lens is a structure composed of a hypotenuse rotation surface 101 obtained by rotating the hypotenuse around the center line of the lens. The incident light AO is refracted at point O, and OB is the refracted light. The optical path is a controllable optical path. Since the optical path is split by the plane, part of the energy will be reflected at point O, that is, the reflected light OC. The stray light generated by the reflected and refracted light at point C through the lens is uncontrollable and will affect the quality of the light spot. Utility Model Content

[0004] The utility model aims to provide a lens, aiming to solve the problem in the prior art that light enters the lens after multiple reflections, thereby generating uncontrollable stray light.

[0005] In the process, there is the problem of uncontrollable stray light.

[0006] In order to solve the above technical problems, the technical solutions adopted by the utility model are as follows:

[0007] The utility model provides a lens, comprising a lens body; wherein the lens body comprises:

[0008] Incident surface;

[0009] An exit surface, arranged opposite to the incident surface;

[0010] A total reflection surface connected between the incident surface and the exit surface;

[0011] A curved surface is located inside the lens body and between the incident surface and the optical path of the total reflection surface. The lens body has a center line passing through the incident surface and the exit surface. The curved surface is rotated around the center line of the lens body to form a lens inner hole.

[0012] Part of the light beam incident from the incident surface to the curved surface is refracted and enters the total reflection surface, and another part of the light beam incident from the incident surface to the curved surface is reflected along the incident surface and out of the lens body.

[0013] Optionally, the curved surface is a Bezier surface.

[0014] Optionally, the inner hole of the lens is a truncated cone-shaped pit.

[0015] Optionally, it also includes a bottom arc surface, which is arranged at the center of the curved surface, and the bottom arc surface is recessed toward the incident surface to form an inwardly concave arc surface, and the area enclosed by the bottom arc surface, the curved surface and the incident surface is the truncated cone-shaped pit.

[0016] Optionally, the exit surface includes an annular exit surface and an exit plane, the annular exit surface is located on an inner side of the exit plane and surrounds the exit plane, and the annular exit surface intersects with the top of the total reflection surface.

[0017] Optionally, the annular emission surface is an arc surface that arches in a direction away from the emission plane.

[0018] Optionally, the emergence surface further includes a top arc surface, the top arc surface is arranged at the center of the annular emergence surface, and the top arc surface is concave toward the emergence plane to form an inner concave arc surface.

[0019] Optionally, the surfaces of the annular emission surface, the top arc surface and the emission plane are beaded.

[0020] Optionally, the total reflection surface is a curved surface.

[0021] Optionally, the lens body is a symmetrical body that rotates along a center line.

[0022] The utility model arranges a curved surface inside the lens body, and the curved surface is located between the light path of the incident surface and the total reflection surface, so that a part of the light beam incident from the incident surface to the curved surface is reflected along the incident surface and out of the lens body, thereby avoiding that uncontrollable or difficult-to-trace light enters the lens again after multiple reflections, generates uncontrollable stray light, reduces the influence of stray light on light quality, and improves the quality of the light spot. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of a structure in which the inner hole of a lens provided by the prior art is a structure formed by a hypotenuse rotation surface obtained by rotating the hypotenuse around a center line;

[0025] Figure 2The inner hole of the lens provided in the embodiment of the utility model is a structural schematic diagram of a curved surface structure obtained by rotating a Bezier curved surface around a center line.

[0026] Markings in the figure:

[0027] 10. Lens body; 11. Incident surface; 12. Exit surface; 121. Annular exit surface; 122. Exit plane; 123. Top arc surface; 13. Total reflection surface; 14. Curved surface; 15. Center line; 16. Inner hole of lens; 17. Bottom arc surface;

[0028] 101. Beveled rotating surface. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0031] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0032] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0033] See also Figure 2The embodiment of the utility model provides a lens, including a lens body 10; wherein the lens body 10 includes: an incident surface 11; an exit surface 12, which is arranged opposite to the incident surface 11; a total reflection surface 13, which is connected between the incident surface 11 and the exit surface 12; a curved surface 14, which is located inside the lens body 10 and the curved surface 14 is located between the optical paths of the incident surface 11 and the total reflection surface 13, the lens body 10 has a center line 15 passing through the incident surface 11 and the exit surface 12, and the curved surface 14 rotates around the center line 15 of the lens body 10 to form a lens inner hole 16; wherein a part of the light beam incident from the incident surface 11 to the curved surface 14 is refracted and enters the total reflection surface 13, and another part of the light beam incident from the incident surface 11 to the curved surface 14 is reflected along the incident surface 11 and exits the lens body 10.

[0034] In this embodiment, the curved surface 14 is a curved surface, which is formed by rotating the curve along the direction of the center line 15 .

[0035] In one embodiment, the structure of the total reflection surface 13 and the curved surface 14 is utilized so that a portion of the light beam incident from the incident surface 11 to the curved surface 14 is refracted into the total reflection surface 13, and another portion is reflected along the incident surface 11 out of the lens body 10. Specifically, Figure 2 As shown, the incident light A'O' contacts the lens inner hole 16 at the point O', O'B' is a controllable refractive light path, and the controllable light path means that the refraction angle of the light passing through a certain material is fixed. In this embodiment, the light O'C' can be controlled to be a reflective light path by controlling the curved surface 14. It can be seen from the optical path that, thanks to the curved surface 14 of the lens inner hole 16, the reflected light that generates stray light will deviate from the lens body 10 after reflection at the point O'. This principle can reduce the influence of stray light on the light quality and improve the quality of the light spot.

[0036] Furthermore, the lens provided by the utility model is a Tir lens. A Tir (total internal reflection) lens is an optical element that uses the total internal reflection phenomenon to control the transmission of light. The Tir lens structure can be designed into various shapes to achieve precise control of light. This lens structure has important applications in various optical devices, such as laser devices, LED lighting, and optical communication systems. In this embodiment, the Tir lens structure is used to effectively control the transmission path of light and improve the efficiency and performance of the optical system.

[0037] Furthermore, the curved surface 14 of the Tir lens is a Bezier surface. In this embodiment, the inner hole 16 of the lens is a curved surface structure obtained by rotating a second-order Bezier curve around the center line 15, and the curvature surface characteristics of the Bezier surface are used to change the reflected light path generated by the incident light, so as to avoid some uncontrollable or difficult to track light from entering the lens again after multiple reflections, thereby generating uncontrollable stray light.

[0038] Specifically, the Bezier surface refers to the second-order Bezier curve. The second-order Bezier curve formula is a mathematical formula that describes the curve on the plane, which is determined by three points. Usually given three points P0, P1 and P2, the second-order Bezier curve formula can be expressed as:

[0039] B(t)=(1-t)^2*P0+2*t*(1-t)*P1+t^2*P2

[0040] Where t is a parameter ranging from 0 to 1. The coordinates of point B(t) on the curve are calculated by the above formula. P0, P1 and P2 are the starting point, control point and end point on the curve, and their coordinates are (P0x, P0y), (P1x, P1y) and (P2x, P2y) respectively. The position of the control point P1 can adjust the curvature and shape of the curve. When the control point is between the starting point and the end point, the curve will pass through the control point; when the control point is outside the starting point and the end point, the curve will not pass through the control point, but will be guided by the control point.

[0041] In this embodiment, the curvature change of the Bezier surface is achieved by controlling the two endpoints (starting point and end point) of the second-order Bezier curve and the position of the control point, thereby changing the reflected light path generated by the incident light through the curvature surface characteristics of the Bezier surface, thereby preventing these uncontrollable or difficult-to-trace light rays from entering the lens again after multiple reflections and generating uncontrollable stray light.

[0042] Furthermore, the inner hole 16 of the lens is a truncated cone-shaped pit. In this embodiment, the inner hole 16 of the lens is provided with a truncated cone-shaped pit. This structure can further control the propagation and focusing effect of light by changing the parameters of the pit (such as height, radius, etc.). In addition, the shape and distribution of the pit may also affect the refraction and reflection of light, thereby changing the optical performance of the lens.

[0043] Furthermore, it also includes a bottom arc surface 17, which is arranged at the center of the curved surface 14, and the bottom arc surface 17 is recessed toward the incident surface 11 to form an inner concave arc surface, and the area surrounded by the bottom arc surface 17, the curved surface 14 and the incident surface 11 is a truncated cone-shaped pit. Figure 2 As shown, the center line 15 of the lens inner hole 16 also passes through the bottom arc surface 17. The setting of the bottom arc surface 17 can affect the refraction and reflection angles of the light. By accurately designing and optimizing the curvature of the bottom arc surface 17, the curvature of the curved surface 14, the shape and size of the pit and other parameters, more precise control of the light can be achieved, thereby reducing the impact of stray light on the light quality and improving the quality of the light spot.

[0044] Furthermore, the exit surface 12 includes an annular exit surface 121 and an exit plane 122, the annular exit surface 121 is located on the inner side of the exit plane 122 and surrounds the exit plane 122, and the annular exit surface 121 intersects with the top of the total reflection surface 13. In this embodiment, the edge point height of the exit plane 122 is flush with the edge point height of the annular exit surface 121, and the setting of the annular exit surface 121 can make the light reflect out of the lens body 10 at a specific angle and direction, achieving more accurate beam shaping and focusing effects.

[0045] The annular exit surface 121 is a curved surface that is arched in a direction away from the exit plane 122. Such an arched curved surface can help reduce light loss and improve the efficiency of the optical system.

[0046] The emission surface 12 further includes a top arc surface 123 . The top arc surface 123 is disposed at the center of the annular emission surface 121 . The top arc surface 123 is recessed toward the emission plane 122 to form an inner concave arc surface.

[0047] The surfaces of the annular exit surface 121, the top curved surface 123 and the exit plane 122 are beaded. In this embodiment, beading is a surface processing technology that uses small particles (beads) to grind or spray on the surface to improve the surface quality, finish and precision. Through beading, the surfaces of the annular exit surface 121, the top curved surface 123 and the exit plane 122 can be made smoother and more uniform, the surface roughness and microscopic defects can be reduced, the transmittance and reflectivity of the lens can be improved, and the performance and efficiency of the optical system can be improved. Beading can also improve the wear resistance and corrosion resistance of the lens and extend its service life.

[0048] Furthermore, the total reflection surface 13 is a curved surface. Total reflection is a phenomenon that occurs when the incident angle is greater than the critical angle when light is refracted from one medium to another (the critical angle refers to the incident angle when the light is incident from one medium to another, making the refraction angle equal to 90 degrees), and the light is completely reflected back to the original medium. In an optical system, the total reflection surface 13 is usually designed as a curved surface to achieve a specific light reflection and focusing effect.

[0049] By designing the total reflection surface 13 as a curved surface, the propagation path and reflection angle of light can be better controlled, which can help reduce light loss and improve the efficiency and performance of the optical system, especially in applications that require precise control of light reflection direction and focusing effect.

[0050] Furthermore, the lens body 10 is a symmetrical body that rotates along the center line 15. In an optical system, a rotationally symmetric lens means that the geometric shape of the lens or the optical curved surface 14 has rotational symmetry, that is, the same shape can be obtained after rotating a certain angle around the center line 15 of the lens body 10. Rotationally symmetric lenses usually have better optical uniformity and stability, and are suitable for a wide range of application scenarios, such as optical equipment such as cameras, telescopes, and microscopes.

[0051] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0052] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive.

[0053] Inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A lens, characterized in that: Comprising a lens body; wherein the lens body comprises: Incident surface; An exit surface, arranged opposite to the incident surface; A total reflection surface connected between the incident surface and the exit surface; A curved surface is located inside the lens body and between the incident surface and the optical path of the total reflection surface. The lens body has a center line passing through the incident surface and the exit surface. The curved surface is rotated around the center line of the lens body to form a lens inner hole. Part of the light beam incident from the incident surface to the curved surface is refracted and enters the total reflection surface, and another part of the light beam incident from the incident surface to the curved surface is reflected along the incident surface and out of the lens body.

2. The lens according to claim 1, characterized in that The curved surface is a Bezier surface.

3. The lens according to claim 1, characterized in that The inner hole of the lens is a truncated cone-shaped pit.

4. The lens according to claim 3, characterized in that It also includes a bottom arc surface, which is arranged at the center of the curved surface. The bottom arc surface is recessed toward the incident surface to form an inwardly concave arc surface, and the area surrounded by the bottom arc surface, the curved surface and the incident surface is the truncated cone-shaped pit.

5. The lens according to claim 1, characterized in that The exit surface includes an annular exit surface and an exit plane, the annular exit surface is located on the inner side of the exit plane and surrounds the exit plane, and the annular exit surface intersects with the top of the total reflection surface.

6. The lens according to claim 5, characterized in that The annular emission surface is an arc surface that arches in a direction away from the emission plane.

7. The lens according to claim 5, characterized in that The exit surface further includes a top arc surface, which is arranged at the center of the annular exit surface, and the top arc surface is concave toward the exit plane to form an inner concave arc surface.

8. The lens according to claim 7, characterized in that The surfaces of the annular emission surface, the top arc surface and the emission plane are beaded.

9. The lens according to claim 1, characterized in that: The total reflection surface is a curved surface.

10. The lens according to claim 1, characterized in that The lens body is a symmetrical body that rotates along a center line.

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