RELATED APPLICATION

[0001] This application claims priority to a Chinese Patent Application No. CN 201911147299.2, filed on November 20, 2019.

FIELD OF THE TECHNOLOGY

[0002] The present invention relates to the field of lamp, with particular emphasis on an LED lamp with uniform illumination.

BACKGROUND OF THE INVENTION

[0003] LED lamps are more and more common in daily life, especially in shopping malls and other showcases. In order to satisfy the requirement that the lamps can illuminate far and near goods at the same time, and to make the light falling on different goods in the near and far end be the same, the designer tried to install multiple light source assembly on the lamp, and a certain angle is formed between the mounting surfaces of the multiple light source assembly, so that a part of the light source assembly is used to illuminate the far end and another part of the light source assembly is used to illuminate the near end.

[0004] For example, as described in the Chinese patent application CN201210441421.9, the lamp includes at least one light-emitting module, the light-emitting module includes at least two sets of light sources, the extensions of the light source center lines have an intersection, so that a certain angle is formed between adjacent light sources to facilitate irradiation in all directions.

[0005] Although this kind of design can solve the problem of uniform luminance on the illuminated surface to a certain extent, the effect is not very ideal, because the areas where the two light sources are close to each other emit weak light, and it is easy to cause little or no light at all in the areas where the two light sources close to each other, forming a dark area, which makes the final illumination surface uneven. Especially when each group of light sources is equipped with a lens module, the problem is more obvious due to the focusing effect of the lens module. BRIEF SUMMARY OF THE INVENTION

[0006] In view of this, the present invention provides an LED lamp with uniform illumination to solve the above technical problems.

[0007] An LED lamp with uniform illumination, comprises at least two light sources, the light sources are arranged side by side along the length direction of the lamp and the extension lines of the optical axis of the light sources intersect;

[0008] wherein, the emitted light of at least one light source is directed to the surface to be irradiated far away from the lamp, and the remaining light source irradiates the surface to be irradiated closer to the lamp, and an area where the at least one light source and the remaining light sources are close to each other form an adjacent area;

[0009] characterized in that:

[0010] the light exit end of the at least one light source is provided with a condenser lens and the light from the remaining light sources is free to emit, and the side light of the at least one light source close to the adjacent area after being projected by the condenser lens meets the light from the remaining light source projected to the adjacent area to cover the adjacent area;

[0011] the thickness of the side of the condenser lens close to the adjacent area is greater than the thickness of the middle part of itself, so that the luminance of the side light of the at least one light source formed after converged by the one side of the condenser lens is consistent with the luminance on the remaining surface to be illuminated.

[0012] The light-emitting surface of the condenser lens is a flat surface, and its thickness gradually decreases from the side close to the adjacent area toward the middle of the lens.

[0013] The light intensity of the at least one light source is greater than the light intensity of the remaining light sources.

[0014] The at least one light source and the remaining light sources both include a circuit board and a point light source arranged on the circuit board and arranged along their length;

[0015] The density of the point light sources on the circuit board of the at least one light source is greater than the density of the point light sources on the circuit board of the remaining light sources. [0016] The light-emitting surface of the condenser lens corresponding to the position of the point light source is provided with a plurality of strips perpendicular to the length direction of the lamp.

[0017] The strips form a circle.

[0018] The light-emitting surface of the condenser lens with the strips is a frosted design.

[0019] One side of the circuit board of the at least one light source is provided with a positioning hole to prevent the condenser lens from being reversed, and the back of the light-emitting surface of the condenser lens is provided with a positioning post adapted to the positioning hole.

[0020] The circuit board of the at least one light source is provided with mounting holes formed between the point light sources; a mounting post is provided on the back of the light emitting surface of the condenser lens, and lower end of the mounting post is formed with a melting column which is adapted to be inserted into the mounting hole and melted when heated so that the mounting column and the mounting hole are fixedly connected.

[0021] Compared with the prior art, the present invention has the advantage that replacing the conventional condenser lens at the light exit end of each light source with a lens set at the light exit end of the light source that only illuminates the far side, and the thickness of one side of the lens toward to the adjacent area formed by the light source illuminating the far side and the light source illuminating the near side is thicker, which can give full play to the converging effect of the condenser lens, so as to make up for the problem of dark areas caused by the less light emitted by the light source that illuminates the far side to the adjacent area and the insufficient light emitted by the light source that illuminates the near side to the adjacent area to ensure that the brightness of the emitted light from the light source illuminating the far side is consistent with the brightness of the emitted light from the light source illuminating the near side to achieve uniform illumination on different illuminated surfaces.

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1 is a structural diagram of a preferred embodiment of an LED lamp with uniform illumination in this application. [0023] FIG. 2 is a schematic diagram of the exploded structure of FIG. 1.

[0024] FIG. 3 is a schematic structural diagram of FIG. 2 from another angle.

DETAILED DESCRIPTION OF THE INVENTION [0025] Hereinafter, specific embodiments of the present invention will be described in further detail based on the drawings. It should be understood that the description of the embodiments of the present invention is not intended to limit the protection scope of the present invention.

[0026] Figures 1 to 3 show a preferred structural embodiment of the LED lamp with uniform illumination of the present invention. The LED lamp includes a lamp body 1, a mounting base 2 arranged at both ends of the lamp body 1. The lamp body 1 includes a lampshade 11 , a base 12, and at least two light sources 13 and 14 arranged on the base 12 side by side along the length direction of the lamp. The light source 13 is also referred to as “first light source” and the (remaining) light source 14 is also referred to as “second light source”. The extension lines of the optical axis of the light sources intersect. The light source are strip-shaped the optical axis is perpendicular to the longitudinal axis of the respective strip. The mounting base 2, the lampshade 11, the base 12, etc. are all conventional components possessed by the LED lamp, and are known to those skilled in the art, so it will not be explained in detail. However, it should be noted that, as those skilled in the art know, the base 12 is mainly used to carry the light source, so it is easy to imagine that in order to achieve a certain illumination purpose, the base 12 can be designed with a corresponding shape or structure according to the purpose, since this is not the focus of this application, and can be adjusted according to actual needs in the actual production process, which will not expand too much here, and the base related to the protection point of this application will be briefly illustrated below.

[0027] Since the items in the showcase are placed close or far away, some items may be located directly under the LED lamps and some are far away from the LED lamps. There may be distant items that cannot be irradiated, making the product not well displayed. When the extension lines of the optical axis of the light source intersect, it means that multiple light sources are not arranged in parallel, but have a certain included angle, that is, there is a certain design included angle between the installation surfaces of the light source, this allows the light to reach far as well as near, so that objects located far end can also receive light. In this application, at least one of the light sources is used to illuminate the surface to be irradiated far away from the lamp and the remaining light source is used to illuminate the surface to be irradiated closer to the lamp. At the same time, for ease of description, the area where the at least one light source and the remaining light sources are close to each other forms an adjacent area.

[0028] In this embodiment, the number of light sources is preferably two. As shown in FIG. 2, the light sources 13, 14 are arranged side by side on the base 12 along the length direction of the lamp, and there is a certain inclination between the substrates 12A, 12B used to carry the light sources 13 and 14, so that the extension lines of the optical axis of the light source 13 and the light source 14 intersect. At the same time, the light source 13 is used to illuminate the distant place and the light source 14 is used to illuminate the near place.

[0029] In order to overcome the problem that dark areas are formed between adjacent areas and illumination are uneven on different illuminated surfaces, the light exit end of the at least one light source is provided with a condenser lens and the light from the remaining light sources is free to emit, and the side light of the at least one light source close to the adjacent area after being projected by the condenser lens meets the light from the remaining light source projected to the adjacent area to cover the adjacent area. At the same time, the thickness of the side of the condenser lens close to the adjacent area is greater than the thickness of the middle part of itself, so that the luminance of the side light of the at least one light source formed after converged by the one side of the condenser lens is consistent with the luminance on the remaining surface to be illuminated. Thus, there are at least two light sources 13 and 14.

[0030] Specifically in this embodiment, the light exit end of (at least one of the at least two light sources), e.g. the (first) light source 13 is provided with a condenser lens 15 and the light from the light exit end of the other light source(s), i.e. of at least one other of the at least two light sources, e.g. the (second) light source 14 is free to emit. Obviously, in order to achieve no dark areas in adjacent areas and prevent the superimposition of light from causing excessive light intensity in adjacent areas, the light emitted from the side of the light source 13 to the adjacent area just meets the light emitted from the light source 14 to the adjacent area, so as to cover the adjacent area. Undoubtedly, it can be achieved in the actual production process by continuously adjusting the included angle between the light sources 13 and 14.

[0031] On this basis, given that the condenser lens 15 can focus the light, the brightness of the same light after being focused is much greater than the unfocused brightness. The energy of the light emitted from the side face of the light source is very weak, and because the light source 13 is used to illuminate distant end, when the thickness of the side of the condenser lens 15 close to the adjacent area is greater than the thickness of its own central part, and when the light emitted from the side face of the light source 13 is concentrated by the thicker part of the lens and then projected to the adjacent area, the emitted light energy and the light energy of the light of the light the light source 14 projected to the adjacent area is equivalent, so as to ensure that there is illumination and uniform illumination in the adjacent area, thereby solving the problem of dark areas; at the same time, based on the characteristics of energy attenuation during the operation of the light, the energy of the light of the light source 13 after being focused is greater than the energy of the light emitted by the light source 14 freely, but there is more energy attenuation when it is emitted to a far distance, which in turn compensates for the uneven light intensity caused by the condenser lens, and achieves the effect of uniform illumination on different illuminated surfaces, that is, the near side of the surface to be irradiated close to the lamp has roughly the same luminance as the far side of the surface to be irradiated farther away from the lamp; for the light source 13 itself, although the light emitted from the middle position of the light source 13 is stronger, the corresponding lens thickness is thinner and the illuminating distance is farther, the energy attenuation is more than other parts, thereby making the light intensity formed by the light source 13 on the surface to be irradiated to be consistent, and the light source 14 itself is the same, so it is finally achieved that the light intensity of the adjacent area the light intensity of the surface to be irradiated is equivalent.

[0032] In order to save costs and facilitate the faster and better realization of the uniformity of illumination during production and debugging, as a preferred situation and suitable for actual lighting requirements, the illumination brightness of the light source 13 is greater than that of the light source 14. Specifically, the light source includes the circuit board and the point light source arranged on the circuit board and arranged along their length. The density of the point light sources 132 on the circuit board 131 is greater than the density of the point light source 142 on the circuit board 141 , specifically shown in FIG. 2. [0033] In this embodiment, the mounting base 2 is fixedly connected to both sides of the base 2 by screws 3, and in order to facilitate design and production, the base 12A carrying the light source 13 on the base 12 is parallel to the plane formed by the central axes of the two screws 3. The substrate 12B that carries the light source 14 forms a certain included angle with the substrate 12Ato satisfy the requirement that the light source 14 illuminates the proximal object and the light source 13 illuminates the distal object.

[0034] Continuing to refer to FIG. 2, the light exit surface of the condenser lens 15 is a flat surface, and its thickness (diameter or aperture) gradually decreases from the side close to the adjacent area toward the middle of the lens. In order to scatter light in the length direction of the lamp and make the light more uniform, preferably, the light exit surface of the condenser lens 15 corresponding to the position of the point light source 132 is provided with a plurality of strips 151 perpendicular to the length direction of the lamp. In this embodiment, the plurality of strips 151 form a circle, and the light exit surface of the condenser lens 15 with the strips 151 is a frosted design.

[0035] The condenser lens 15 can have multiple groups, and each group can include multiple sub-lens. As in this embodiment, the condenser lens 15 is formed by five sub-lens 152 consecutively. When the number of sub-lens is large, the installation is inconvenient. In order to improve the installation efficiency, the side of the circuit board corresponding to the light source that illuminates the far end is provided with a positioning hole to prevent the condenser lens from being reversed, and the back of the light exit surface of the condenser lens is provided with a positioning post adapted to the positioning hole. In the present application, a positioning hole 133 is provided on one side of the circuit board 131 to prevent reverse installation, and a positioning post 153 is provided on the back of the light exit surface of the condenser lens 15.

[0036] In order to fix the lens with the circuit board, as an improvement, the circuit board 131 is provided with a mounting hole 134 formed between the point light sources 132, a mounting post 154 is provided on the back of the light emitting surface of the condenser lens 15, and the lower end of the mounting post 154 is formed with a melting column 155 which is adapted to be inserted into the mounting hole 134 and melted when heated so that the mounting column 154 and the mounting hole 134 are fixedly connected. [0037] In summary, the present invention relates to an LED lamp with uniform illumination, comprising at least two light sources, the light exit end of the at least one light source is provided with a condenser lens and the light from the remaining light sources is free to emit, and the side light of the at least one light source close to the adjacent area after being projected by the condenser lens meets the light from the remaining light source projected to the adjacent area to cover the adjacent area. The present invention ensure that the brightness of the emitted light from the light source illuminating the far side is consistent with the brightness of the emitted light from the light source illuminating the near side to achieve uniform illumination on different illuminated surfaces.

In summary, the present invention relates to an LED lamp with uniform illumination, comprising at least two light sources, the light exit end of the at least one light source is provided with a condenser lens and the light from the remaining light sources is free to emit, and the side light of the at least one light source close to the adjacent area after being projected by the condenser lens meets the light from the remaining light source projected to the adjacent area to cover the adjacent area. The present invention ensure that the brightness of the emitted light from the light source illuminating the far side is consistent with the brightness of the emitted light from the light source illuminating the near side to achieve uniform illumination on different illuminated surfaces.

The above disclosure has been described by way of example and in terms of exemplary embodiment, and it is to be understood that the disclosure is not limited thereto. Rather, any modifications, equivalent alternatives or improvement etc. within the spirit of the invention are encompassed within the scope of the invention as set forth in the appended claims.