A focusing lens

Abstract

The application belongs to the technical field of lighting devices, and provides a focusing lens, which comprises a mirror body, the mirror body is provided with an entrance surface and an exit surface, the entrance surface is provided with three circles of reflection inner teeth which are concentric with the mirror body and outwardly convex, the three circles of reflection inner teeth are arranged in sequence from inside to outside; the entrance surface is provided with reflection outer teeth which are concentric with the mirror body, the reflection outer teeth are arranged at the outermost periphery of the entrance surface; the exit surface is provided with multiple circles of sawtooth-shaped grooves which are concentric with the mirror body, and the multiple circles of sawtooth-shaped grooves are the same as the tooth pattern of a Fresnel lens. The application can realize the change of the light exit angle from a small angle to a large angle within a shorter focusing stroke while the thickness of the lens is small, the flatness of the exit surface can also optimize the effect of the secondary light spot and control stray light.

Description

Technical Field

[0001] This application belongs to the field of lighting equipment technology, and more specifically, relates to a focusing lens. Background Technology

[0002] Currently available focusing lenses include frog-eye type focusing lenses, convex lens focusing lenses, and sawtooth thin lens focusing lenses. All three types of lenses have obvious drawbacks.

[0003] Convex lens focusing has a significant drawback: when the lens is focused to a small angle, most of the light does not pass through the lens but goes directly to the sides of the lamp body, resulting in a loss of luminous efficiency and violating the current requirements for energy conservation and environmental protection in lighting fixtures.

[0004] The frog-eye lens has a long focusing range and a large lens height. In addition to increasing the cost by requiring a corresponding increase in the height of the lamp, the light source is embedded in the inner cavity of the lens entrance aperture during focusing. The long protrusion of this part of the heat sink makes it difficult to conduct heat to the main body of the heat sink below, which will cause poor heat dissipation and affect the life of the lamp. On the other hand, from the perspective of the general public's preference for the appearance of the lens, people prefer lamps with a flat lens surface, while the frog-eye lens has a significant convex effect on the light-emitting surface.

[0005] In pursuit of shorter focusing distances, smaller lens sizes, and flatter light-emitting surfaces, designers have developed serrated thin lenses. These lenses struggle to achieve small-angle optics, typically having an angle 5-10° larger than that of a frog-eye lens. They also exhibit noticeable spot and secondary spot effects, as well as more stray light, which are some of the biggest drawbacks of this type of lens. Utility Model Content

[0006] In order to overcome the above-mentioned shortcomings in the prior art, the purpose of this application is to provide a focusing lens that can reduce the lens thickness, and at the same time, change the light output angle from a small angle to a large angle within a short focusing stroke, while also achieving a flat light output surface, optimizing the secondary spot effect, and controlling stray light.

[0007] The technical means adopted in this application to solve the above-mentioned technical problems are:

[0008] This application provides a focusing lens, including a lens body. The lens body has an incident light surface and an exit light surface. The incident light surface has three concentric rings of outwardly protruding reflective inner teeth, which are arranged sequentially from the inside to the outside. The incident light surface also has concentric reflective outer teeth, which are located at the outermost edge of the incident light surface. The exit light surface has multiple concentric rings of serrated grooves, which are the same as the tooth pattern of a Fresnel lens.

[0009] Preferably, the light-incident surface is provided with a plurality of convex spherical units distributed in a hexagonal compound eye array.

[0010] Preferably, the bottom of the reflective internal teeth is flush with the surface.

[0011] Preferably, the length of the outer reflective tooth is greater than that of the inner reflective tooth, and the bottom of the outer reflective tooth protrudes beyond the bottom of the inner reflective tooth.

[0012] Compared with the prior art, the focusing lens of this application has three rings of inner reflective teeth and outer reflective teeth on the light-incident surface, which can ensure the uniformity of the light spot in the middle of focusing. The light-out surface of the lens has a serrated groove at the center, which is the same as the tooth pattern of the Fresnel lens. This serrated groove can ensure the realization of the minimum angle and optimize the problems of light spot, secondary light spot and stray light. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the focusing lens of this application.

[0015] Figure 2 This is a cross-sectional view of the focusing lens of this application.

[0016] Figure 3 This describes the small-angle optical effect of the focusing lens in this application.

[0017] Figure 4 This is for the wide-angle optical effect of the focusing lens in this application.

[0018] Figure 5 The light path for focusing at a small angle is shown in the figure.

[0019] Figure 6 The light path at a large focusing angle is shown in the figure.

[0020] Figure 7 This refers to the light output range when the focus is at a small angle.

[0021] Marker explanation:

[0022] 1. Mirror body; 2. Light-incident surface; 3. Light-exit surface; 4. Internal reflective teeth; 5. External reflective teeth; 6. Serrated groove; 7. Convex spherical unit; 8. Heat sink; 9. Light source. Detailed Implementation

[0023] To better understand the above-mentioned objectives, features, and advantages of this utility model, it will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Many specific details are set forth in the following description to provide a thorough understanding of this utility model; the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0024] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. Similar reference numerals and letters denote similar items in the following figures; therefore, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] like Figures 1-2 As shown, this embodiment provides a focusing lens, including a lens body 1. The lens body 1 is provided with an incident light surface 2 and an exit light surface 3. The incident light surface 2 is provided with three concentric rings of outwardly protruding reflective inner teeth 4, which are arranged sequentially from the inside to the outside. The incident light surface 2 is provided with reflective outer teeth 5, which are concentric with the lens body 1 and are located at the outermost edge of the incident light surface 2. The exit light surface 3 is provided with multiple rings of serrated grooves 6, which are concentric with the lens body 1 and have the same tooth pattern as a Fresnel lens.

[0026] In some preferred embodiments of this invention, the light-incident surface 2 is provided with a plurality of convex spherical units 7 arranged in a hexagonal compound eye array. This enhances the light mixing effect of the lens and improves the uniformity of the light spot.

[0027] In some preferred embodiments of this invention, the bottom of the reflective inner teeth 4 is flush with the surface. This further ensures the uniformity of the light spot in the focusing section of the lens.

[0028] In some preferred embodiments of this invention, the length of the external reflective tooth 5 is greater than that of the internal reflective tooth 4, and the bottom of the external reflective tooth 5 protrudes beyond the bottom of the internal reflective tooth 4. This ensures that the diameter of the external heat sink 8's protrusion is large enough to facilitate sufficient heat dissipation from the light source 9 to the bottom of the heat sink 8.

[0029] In practical use, the lens of this utility model is as follows: Figures 3-4 As shown, the light source 9 is placed at a distance a from the light-emitting surface 3 of the lens. At this time, it has a small-angle optical effect. When the lens moves down a height h, it has a large-angle optical effect. The optical focusing stroke h is much smaller than that of the frog-eye focusing lens. The height d of the protrusion of the heat sink 8 can be very small, which is beneficial for heat conduction to the lower end of the heat sink 8.

[0030] like Figure 7 As shown, when the focus is adjusted to a small angle, the light output range of the lens-controlled light source 9 is 140-150°.

[0031] In the aforementioned focusing lens, the light output angle range of the focusing lens is 15°-60°, and the light trajectory at a small focusing angle is as follows: Figure 5 As shown, the light trajectory at a large focusing angle is as follows: Figure 6 As shown.

[0032] Compared with the prior art, the light-incident surface 2 of the focusing lens of this application is provided with three rings of inner reflective teeth 4 and outer reflective teeth 5, which can ensure the uniformity of the light spot in the middle of focusing; the center of the light-exit surface 3 of the lens is provided with a serrated groove 6 that is the same as the tooth pattern of the Fresnel lens. The serrated groove 6 can ensure the realization of the minimum angle and optimize the problems of light spot, secondary light spot and stray light.

[0033] The above description is merely a specific embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should also be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A focusing lens, characterized in that, The lens includes a lens body, which has an incident light surface and an exit light surface. The incident light surface has three concentric rings of outwardly protruding reflective inner teeth, arranged sequentially from the inside to the outside. The incident light surface also has concentric rings of reflective outer teeth, located at the outermost edge of the incident light surface. The exit light surface has multiple concentric rings of serrated grooves, which are identical to the tooth patterns of a Fresnel lens.

2. The focusing lens according to claim 1, characterized in that, The light-incident surface is provided with multiple convex spherical units arranged in a hexagonal compound eye array.

3. The focusing lens according to claim 1, characterized in that, The bottom of the reflective internal teeth is flush with the surface.

4. The focusing lens according to claim 1, characterized in that, The length of the outer reflective tooth is greater than that of the inner reflective tooth, and the bottom of the outer reflective tooth protrudes beyond the bottom of the inner reflective tooth.

Images