CN110375271A - LED lens - Google Patents

Abstract

An embodiment of the present invention provides an LED lens, which includes an inverted frustum-shaped lens body with a thick top and a thin bottom. The middle part of the bottom surface of the lens body is recessed toward the top surface to form an accommodation cavity for accommodating the LED light source. The cavity wall is the incident surface of the lens body, the side of the lens body is the total reflection surface, the top surface of the lens body is the exit surface, the take-up shaft accommodation cavity is in the shape of a strip whose length is greater than the width, and the take-up shaft total reflection surface is relative to the take-up shaft The central axis surface in the length direction of the accommodating cavity and the central axis surface in the width direction are all symmetrically arranged smooth curved surfaces. The dimension of the cross-section of the bobbin in the width direction of the housing chamber. In this embodiment, the length direction of the lens body corresponds to the length direction of the LED light-emitting chips arranged in strips, and the center of each LED light-emitting chip coincides with the center of the longitudinal section in the width direction, which can better mix and concentrate light. Light.

Description

LED lens

technical field

Embodiments of the present invention relate to the technical field of LED lighting, in particular to an LED lens.

Background technique

In order to mix light in existing LED lamps, an LED lens is usually arranged outside the LED light source to converge the light, and the mixing effect of the emitted light is better through the light concentrating effect of the lens. The current LED lens generally uses a rotationally symmetrical total reflection lens to concentrate light. However, when the LED light source is formed by an arrangement of LED light-emitting chips arranged in strips, the LED light-emitting chip in the center of the LED lens and the LED light-emitting chip on the outer edge The center of the LED is deviated greatly, so the light emission angles of the LED light-emitting chips on the outer edge and the LED light-emitting chips near the center will have a large difference, resulting in low light gathering efficiency and poor light mixing effect in the end.

Contents of the invention

The technical problem to be solved by the embodiments of the present invention is to provide an LED lens, which has a good light mixing effect for LED light sources of LED chips arranged in strips.

In order to solve the above technical problems, embodiments of the present invention provide the following technical solutions: an LED lens, comprising an inverted truncated cone-shaped lens body with a thick top end and a thin bottom end, the middle part of the bottom surface of the lens body is formed by being concave toward the top surface An accommodating cavity for accommodating the LED light source, the cavity wall of the accommodating cavity is the incident surface of the lens body, the side surface of the lens body is a total reflection surface, the top surface of the lens body is the outgoing surface, and the accommodating The cavity is in the shape of a strip whose length is greater than the width, and the total reflection surface is a smooth curved surface symmetrically arranged with respect to the central axis surface in the length direction of the accommodation cavity and the central axis surface in the width direction, and any part of the total reflection surface A dimension of a cross section parallel to the bottom surface of the lens body along the length direction of the accommodating cavity is greater than a dimension of the cross section along the width direction of the accommodating cavity.

Further, the outgoing surface is a rounded rectangle or a ellipse-like plane.

Further, the top surface of the accommodating cavity is a plane or an arc surface protruding toward the inside of the accommodating cavity.

Further, the LED lens further includes a bracket that surrounds the outside of the emitting surface of the lens body and is integrally connected with the top edge of the lens body at the top end.

Further, the bottom end surface of the bracket is also provided with a positioning column protruding from the bottom end surface.

Further, the bottom end surface of the bracket is also provided with a cooling air duct connecting the inside and outside of the bracket.

Further, the bracket is cylindrical and the bottom edge is formed with an everted flange.

Further, the bottom surface of the lens body is flush with the bottom end surface of the bracket or located inside the bottom end surface of the bracket.

After adopting the above-mentioned technical solution, the embodiment of the present invention has at least the following beneficial effects: the embodiment of the present invention can effectively communicate with the LED light source composed of LED light-emitting chips arranged in a strip shape through the accommodating cavity having a long strip shape whose length is greater than the width. Assemble; the total reflection surface is a smooth curved surface that is symmetrically arranged with respect to the central axis surface in the length direction of the accommodation cavity and the central axis surface in the width direction, and has a good effect on converging light; and through any of the total reflection surfaces The dimension of a cross section parallel to the bottom surface of the lens body in the length direction of the housing cavity is greater than the dimension of the cross section in the width direction of the housing cavity, so that the length direction of the lens body is the same as that of the LED light-emitting chips arranged in strips Corresponding to the length direction, the center of each LED light-emitting chip coincides with the center of the longitudinal section in the width direction, so that the light emitted by each LED light-emitting chip is refracted by the total reflection surface. Light mixing and spotlighting.

Description of drawings

FIG. 1 is a schematic perspective view of an alternative embodiment of the LED lens of the present invention.

Fig. 2 is a schematic cross-sectional view of an optional embodiment of the LED lens of the present invention along the mid-axis plane along the length direction.

Fig. 3 is a schematic cross-sectional view of an optional embodiment of the LED lens of the present invention along the mid-axis plane in the width direction.

Detailed ways

The present application will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following exemplary embodiments and descriptions are only used to explain the present invention, not as a limitation to the present invention, and, in the case of no conflict, the embodiments in the application and the features in the embodiments can be combined with each other .

As shown in Figures 1 to 3, an embodiment of the present invention provides an LED lens, which includes an inverted frustum-shaped lens body 1 with a thick top and a thin bottom, and the middle part of the bottom surface of the lens body 1 is concave toward the top surface. An accommodation cavity 10 for accommodating the LED light source 3 is formed, the cavity wall of the accommodation cavity 10 is the incident surface 12 of the lens body 1, the side surface of the lens body 1 is a total reflection surface 14, and the lens body 1 The top surface is the exit surface 16, and the accommodation cavity 10 is in the shape of a strip whose length is greater than the width. Symmetrically arranged smooth curved surfaces, the size of any cross section of the total reflection surface 14 parallel to the bottom surface of the lens body 1 in the length direction of the housing cavity 10 is larger than the size of the cross section in the width direction of the housing cavity 10 .

According to the embodiment of the present invention, the accommodating cavity 10 is in the shape of a strip whose length is greater than the width, and can be effectively assembled with the LED light source 3 composed of LED light-emitting chips arranged in a strip; the total reflection surface 14 is opposite to the accommodating cavity 10 The central axis surface in the length direction of the cavity 10 and the central axis surface in the width direction are all symmetrically arranged smooth curved surfaces, which have a good converging effect on light; and pass through any cross section of the total reflection surface 14 parallel to the bottom surface of the lens body 1 The dimension in the length direction of the housing cavity 10 is greater than the dimension of the cross section in the width direction of the housing cavity 10, so that the length direction of the lens body 1 corresponds to the length direction of the LED light-emitting chips arranged in strips, each The center of the LED light-emitting chip coincides with the center of the longitudinal section in the width direction, so that the light emitted by each LED light-emitting chip is refracted by the total reflection surface 14. Light.

In an optional embodiment of the present invention, the emergent surface 16 is a rounded rectangle or a quasi-elliptical plane. In this embodiment, the outgoing surface 16 adopts a rounded rectangle or a quasi-elliptical shape, which not only can realize the above-mentioned structure of the lens body 1, but also saves materials and reduces occupied volume during manufacturing and production. In the embodiment shown in Fig. 1 to Fig. 3, the outgoing surface 16 adopts a quasi-elliptical plane; in addition, the outgoing surface 16 is set as a flat surface, so that the light emitted from the outgoing surface 16 is evenly distributed, reducing the glare value and light pollution.

In yet another optional embodiment of the present invention, as shown in FIG. 3 , the end surface of the receiving chamber 10 near the exit surface 16 is a plane or an arc surface concave toward the inside of the receiving chamber 10 . In this embodiment, by setting the end face of the receiving chamber 10 close to the exit surface 16 as an arcuate surface concave to the inside of the receiving chamber 10, the inner surface area of the receiving chamber 10 can be effectively increased so that the receiving chamber 10 can receive the light emitted by the LED light source 3 efficiency, and improve the light utilization rate of the LED lens of the present invention.

In yet another optional embodiment of the present invention, the LED lens further includes a bracket 5 that surrounds the outside of the exit surface 16 of the lens body 1 and is integrated with the top edge of the lens body 1 at its top end. In this embodiment, the bracket 5 surrounding the total reflection surface 14 is integrally formed on the outer edge of the lens body 1 to support and protect the lens body 1 .

In an alternative embodiment of the present invention, the bottom end surface of the bracket 5 is also provided with a positioning column 50 protruding from the bottom end surface. In this embodiment, the positioning column 50 protruding from the bottom surface of the bracket 5 facilitates the assembly of the bracket 5 and the installation circuit board 7 of the LED light source 3 , and effectively realizes positioning.

In yet another optional embodiment of the present invention, the bottom end surface of the support 5 is further provided with a cooling air duct 52 connecting the inside and outside of the support 5 . In this embodiment, by setting the heat dissipation air duct 52, the air can easily pass in and out of the support 5 through the heat dissipation air duct 52, which improves the fluidity of the air, and can effectively dissipate the heat generated when the LED light source 3 inside the support 5 is working, so that The LED light source 3 is kept at an appropriate working temperature, which can effectively prolong the service life of the LED lamp. In actual implementation, as shown in FIG. 1 , the heat dissipation air duct 52 is a gap provided on the bottom edge of the bracket 5 .

In an optional embodiment of the present invention, the bracket 5 is cylindrical and has an everted flange 54 formed on the bottom edge. In this embodiment, the bracket 5 is arranged in a cylindrical shape to match the shape of the lens main body 1 to reduce the volume of the LED lens, and an everted flange 54 is set at the bottom edge of the bracket 5 to increase the size of the bracket 5 and the corresponding LED lens. The contact area of the installation circuit board 7 of the LED light source 3 makes the installation of the LED lens more stable.

In an optional embodiment of the present invention, the bottom surface of the lens body 1 is flush with the bottom end surface of the bracket 5 or located inside the bottom end surface of the bracket 5 . In this embodiment, the bottom edge of the lens body 1 is accommodated inside the bottom edge of the bracket 5 or flush with the bottom surface of the bracket 5. The bracket 5 can better support and protect the lens body 1, and when the lens body 1 is installed Also more stable. In the embodiment shown in Figures 1-3, the bottom edge of the lens body 1 and the bottom edge of the bracket 5 are respectively located on two mutually parallel planes and the bottom edge of the lens body 1 is closer to the top of the lens body 1 noodle.

Embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementations, and the above-mentioned specific implementations are only illustrative, rather than restrictive, and those of ordinary skill in the art will Under the enlightenment of the present invention, many forms can also be made without departing from the gist of the present invention and the protection scope of the claims, and these all belong to the protection scope of the present invention.

Claims (8)

1. An LED lens, comprising an inverted frustum-shaped lens body that is thick at the top and thin at the bottom, the middle part of the bottom surface of the lens body is recessed toward the top surface to form an accommodation cavity for accommodating the LED light source, the accommodation cavity The wall of the cavity is the incident surface of the lens body, the side surface of the lens body is a total reflection surface, and the top surface of the lens body is an exit surface, and it is characterized in that the accommodating cavity is in the shape of a strip whose length is greater than the width , the total reflection surface is a smooth curved surface symmetrically arranged with respect to the central axis surface in the length direction of the accommodation cavity and the central axis surface in the width direction, any cross section of the total reflection surface parallel to the bottom surface of the lens body The dimension in the length direction of the accommodating cavity is larger than the dimension of the cross section in the width direction of the accommodating cavity. 2 . The LED lens according to claim 1 , wherein the outgoing surface is a rounded rectangle or a quasi-elliptical plane. 3 . 3 . The LED lens according to claim 1 , wherein the top surface of the accommodation cavity is a plane or an arc surface protruding toward the interior of the accommodation cavity. 4 . 4. The LED lens according to claim 1, characterized in that, the LED lens further comprises a bracket that surrounds the outside of the emitting surface of the lens body and is integrally connected with the top edge of the lens body at a top end. 5. The LED lens according to claim 4, characterized in that, the bottom end surface of the bracket is further provided with a positioning column protruding from the bottom end surface. 6 . The LED lens according to claim 4 , wherein a heat dissipation air duct connecting inside and outside of the bracket is further provided on the bottom end surface of the bracket. 7 . 7 . The LED lens according to claim 4 , wherein the bracket is cylindrical, and a bottom edge is formed with an everted flange. 8 . 8 . The LED lens according to claim 4 , wherein the bottom surface of the lens body is flush with the bottom end surface of the bracket or located inside the bottom end surface of the bracket.