WO2021068824A1

WO2021068824A1 - Light distribution system, and light source module and lamp comprising light distribution system

Info

Publication number: WO2021068824A1
Application number: PCT/CN2020/119236
Authority: WO
Inventors: 黄俊晖; 郑磊; 薛永
Original assignee: 苏州欧普照明有限公司; 欧普照明股份有限公司
Priority date: 2019-10-11
Filing date: 2020-09-30
Publication date: 2021-04-15

Abstract

A light distribution system, comprising a lens (1), wherein the lens (1) is a rotational symmetrical structure, the bottom part of the lens (1) is provided with a concave optical cavity (4) used for accommodating a light-emitting source (3), a light entry surface (101) is formed at the inner wall of the optical cavity (4), the upper surface of the top part of the lens (1) is a light exit surface (102), and side surfaces between the top part and the bottom part are internal reflection surfaces (103); and reflective pieces (21, 23), which are provided in the optical cavity (4). Light that does not enter the lens (1) from the light entry surface (101) but is reflected by the light entry surface (101) is reflected again so as to enter the light entry surface (101). By means of adding reflective pieces (21, 23) into the optical cavity (4) of the lens (1), light emitted by the light-emitting source (3) of the optical cavity is provided, a large portion of the light enters the lens (1) by means of the light entry surface and a small portion is reflected. The reflective pieces (21, 23) reflects said part of the reflected light back again to the original light path to eliminate the Fresnel effect and more efficiently use light energy. The system cooperates with conventional TIR lenses, eliminates negative light spots, and achieves a degree of concentration.

Description

Light distribution system and light source module and lamp including the light distribution system

Technical field

The invention relates to a light distribution system for lighting, and a light source module and a lamp including the light distribution system.

Background technique

In recent years, with the vigorous development of LED technology, various LED lamps have been developed and applied one after another. The user's requirements for light perception are becoming more and more clear and specific. The standard for judging the excellent concentration of light from the luminaire is clear and concentrated in the direction to be irradiated.

At present, the most common LED light distribution optics for lamps are reflecting cups or TIR lenses or plano-convex lenses. Among them, due to its own characteristics, the light spot of the reflecting cup is egg yolk distribution, and the negative light spot is larger and brighter. Due to the Fresnel effect, a single TIR lens has more apertures, which affects the quality of the light spot. The plano-convex lens has low characteristic efficiency and hard aperture. In short, the above several light-concentrating schemes are not ideal, so a new optical technical scheme is needed, which can concentrate the light spots while reducing the negative light spots.

Summary of the invention

The embodiment of the present application provides a light distribution system, which is used to solve the problem of large negative light spot and Fresnel effect in the existing light concentrating scheme.

The embodiments of this application adopt the following technical solutions:

In the first aspect, this application provides a light distribution system, including:

The lens has a rotationally symmetric structure. The bottom of the lens is provided with a concave optical cavity for accommodating the light source. The inner wall of the optical cavity forms a light-incident surface. The upper surface of the lens is the light-emitting surface. The side surface is the internal reflection surface;

The reflecting part is arranged in the optical cavity, and reflects the optics that has not entered the lens from the light-incident surface but is reflected by the light-incident surface again to make it enter the light-incident surface.

Preferably, the reflector is in an inverted cone shape and is arranged above the light-emitting source, with the tapered tip facing the light-emitting source.

Preferably, the reflector includes at least one reflector, and the axis of the reflector and the lens coincide.

Preferably, the shape of the reflecting plate is consistent with the cross-sectional shape of the axis of the optical cavity passing through the lens, a notch is provided under the reflecting plate, and the notch is provided above the light-emitting source.

Preferably, the side of the reflecting plate is attached to the inner wall of the optical cavity.

Preferably, the reflecting member includes more than two reflecting plates.

Preferably, the reflecting plates intersect at the axis of the lens.

Preferably, the reflector is a metal member or a reflective material is sprayed on the surface.

Preferably, the reflector and the lens are integrally formed.

Preferably, the lens is a TIR lens.

On the other hand, the present application provides a light source group including a light-emitting source and a light distribution system as described above, and the optical cavity of the lens in the light distribution system covers the light-emitting source.

Preferably, the light source is an LED light source.

In another aspect, the present application also provides a lamp, including a housing, a driving module, and the light source module as described above, the light source module and the driving module are arranged in the housing, the driving module and The light source module is electrically connected.

In this application, a reflector is added in the light source accommodating cavity of the lens, and most of the light emitted by the light source arranged in the light source accommodating cavity enters the lens through the light incident surface, a small part is reflected, and the reflector reflects this part back The light is reflected back to the original optical path to eliminate the Fresnel effect, and to use light energy more efficiently, with conventional TIR lenses, to eliminate negative spots and achieve concentration.

Description of the drawings

The drawings described here are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

1 is a schematic diagram of the structure and light path of the light source module in the first embodiment of the present invention;

2 is a schematic diagram of the structure of the light distribution system in the second embodiment of the present invention;

3 is a cross-sectional view of the light distribution system in the second embodiment of the present invention;

4 is a schematic diagram of the structure of the light distribution system in the third embodiment of the present invention;

5 is a cross-sectional view of the light distribution system in the third embodiment of the present invention;

6 is a rear side view of a schematic structural diagram of the light distribution system in the third embodiment of the present invention;

FIG. 7 is a schematic diagram of the structure of the reflector in the light distribution system in the third embodiment of the present invention;

8 is a schematic diagram of the structure of the light source module in the third embodiment of the present invention;

Fig. 9 is a schematic structural diagram of a lamp according to a preferred embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be described clearly and completely in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The first embodiment of the present invention is shown in Fig. 1, which is a light source module including a light distribution system and a light source 3. This embodiment adopts an LED light source. The LED light source may be a single LED Chip or multiple LED Chips in series, Connected in parallel or series-parallel, it can also be a COB light source.

The light distribution system covers the light source 3, and the light distribution system includes a lens 1 and a reflector 21. The lens 1 is a TIR lens with a rotationally symmetric structure. The bottom of the lens 1 is provided with a concave optical cavity 4 for accommodating the light-emitting source 3. The inner wall of the optical cavity 4 is the light incident surface 101 of the lens 4. The upper surface of the top of the lens 1 is the light-emitting surface 102, and the light-emitting surface 102 may have additional surface structures. In this embodiment, the light-emitting surface 102 has a honeycomb-shaped microstructure. In other preferred embodiments, the light-emitting surface may also be a smooth surface. Or perform frosting and other process treatments on the surface. The side surface between the top and the bottom is the internal reflection surface 103.

The reflector 21 and the light source 3 are arranged in the optical cavity 4 together. The light-incident surface 101 covers the light-emitting source 3, and most of the light emitted by the light-emitting source 3 enters the lens 1 through the light-incident surface 101, as shown in the solid line light path in FIG. 1. A small part is reflected back by the light incident surface 101, in the dashed light path in FIG. 1, these rays of light are reflected again by the reflector 21 and then enter the light incident surface 101 again. In this embodiment, the reflector 21 has an inverted cone shape and is arranged above the light emitting source 3 with the tip of the cone facing the light emitting source 3. In a preferred embodiment, the central axis of the cone and the axis of the lens 1 coincide. In this embodiment, the reflector 21 is a metal piece, which can be arranged by pasting, or it can be directly sandwiched by the lens 1 and the light source 3. In other preferred embodiments, the reflector 21 may also be made of other materials such as plastic, and a reflective coating may also be added to the surface facing the light source 3 in order to improve the reflection efficiency. In another preferred embodiment, the reflector 21 can also be made of the same material as the lens 1, and the two are integrally formed, and the surface of the reflector is sprayed with a reflective layer.

The light distribution system in the second embodiment of the present invention is shown in Figs. 2 and 3, wherein the structure of the lens 1 is similar to that of the first embodiment, and will not be repeated here. In the first embodiment, the reflector 21 has an inverted cone shape, which partially blocks the light emitted by the light source 3 facing the light exit surface 102 of the lens. Therefore, in the second embodiment, our reflector is designed in a flat plate shape, which is a piece of The reflector 22 perpendicular to the mounting surface of the light-emitting source 3, and the axis of the reflector 22 and the lens coincide, so as to avoid blocking the light of the light-emitting source 3 facing the light-emitting surface 102 of the lens to a minimum. The reflector 22 is arranged above the light-emitting source 3, and its shape is consistent with the cross-sectional shape of the axis of the optical cavity 4 passing through the lens. For example, in this embodiment, the light-incident surface 101 of the lens 1 facing the light-emitting source 3 is a circular arc surface. The top of 22 is an arc, and the side of the reflector 22 is attached to the inner wall of the optical cavity 4. Glue can be applied to the side during installation, or the reflector 22 and the inner wall of the optical cavity 4 can be fixed together by interference fit.

In the third embodiment of the present invention, the light distribution system is further optimized on the second embodiment, and its basic structure is similar to that of the second embodiment. The reflector 23 also adopts a vertically arranged plate structure, as shown in Fig. 4, As shown in Figure 5 and Figure 6. The difference from the second embodiment is that the structure of the reflector 23 is different. As shown in FIG. 7, the reflector 23 includes a plurality of reflector plates 2301. In the third embodiment, it includes four reflector plates 2301. Of course, it can also be regarded as It is formed by the intersection of two plates with the same vertical cross-sectional shape as the optical cavity 4, and the two plates intersect in a cross shape when viewed from the top. The intersection of the two plates is exactly on the axis of the lens 1. As mentioned above, the third embodiment includes four reflecting plates 2301. The range from the axis of the lens 1 to the inner wall of the optical cavity 4 is one plate. Therefore, in other preferred implementations In an example, the number of plates can also be different, such as 3 or 5. The shape of the plates is the half of the vertical section of the optical cavity 4 cut with the axis of the lens 1, and the reflecting plates 2301 intersect at the axis of the lens 1. In a more preferred embodiment, the plates are evenly distributed along the circumference. For example, when there are 3 plates, the angle between two adjacent plates is 120°, and when there are 5 plates, the angle between two adjacent plates is 72°.

In the third embodiment, the reflector 23 is a metal member. In other preferred embodiments, it can also be a plastic member, and the surface can also be coated with a reflective coating. In order to prevent the reflector 23 from damaging the light-emitting source 3, a notch 2303 corresponding to the light-emitting source is provided on the side of the radiation plate 2301 facing the light-emitting source 3, and the notch 2303 is provided above the light-emitting source 3 to avoid the light-emitting source 3.

FIG. 8 is a light source module composed of a light distribution system of the third embodiment, which includes a lens 1, a reflector 23, and a light source 3. The light source module can be applied to the lamp shown in FIG. 9. In FIG. 9 is a spotlight, which includes a face ring 64, a front cover 63, a rear shell 61, and a light source module composed of a light source 3 and a light distribution system 8. The group 62 is arranged in the rear shell 61. In other preferred embodiments, the light source module can also be used in other lamps such as chandeliers, downlights, etc., which is not limited in this application.

Those skilled in the art should understand that although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

A light distribution system, which includes:

The lens has a rotationally symmetric structure. The bottom of the lens is provided with a concave optical cavity for accommodating the light source. The inner wall of the optical cavity forms a light-incident surface. The upper surface of the lens is the light-emitting surface. The side surface is the internal reflection surface;

The reflecting part is arranged in the optical cavity, and reflects the optics that has not entered the lens from the light-incident surface but is reflected by the light-incident surface again to make it enter the light-incident surface.
The light distribution system according to claim 1, wherein the reflector is in an inverted cone shape and is arranged above the light emitting source, and the tapered tip faces the light emitting source.
The light distribution system according to claim 1, wherein the reflector includes at least one reflector plate, and the axes of the reflector plate and the lens coincide.
The light distribution system according to claim 3, wherein the shape of the reflector is the same as the cross-sectional shape of the optical cavity passing through the axis of the lens, a gap is provided under the reflector, and the gap is provided in the Above the light source.
4. The light distribution system according to claim 4, wherein the side of the reflector plate is attached to the inner wall of the optical cavity.
The light distribution system according to any one of claims 3 to 5, wherein the reflecting member includes more than two reflecting plates.
The light distribution system according to claim 6, wherein each of the reflecting plates intersects at the axis of the lens.
The light distribution system according to any one of claims 1-5 or 7, wherein the reflector is a metal member or a surface is sprayed with a reflective material.
The light distribution system according to any one of claims 1-5 or 7, wherein the reflector and the lens are integrally formed.
The light distribution system according to any one of claims 1-5 or 7, wherein the lens is a TIR lens.
A light source module, wherein the light source module comprises a light source and the light distribution system according to any one of claims 1-10, and the optical cavity of the lens in the light distribution system covers the light light source.
The light source module according to claim 10, wherein the light source is an LED light source.
A lamp comprising a housing and a drive module, wherein the lamp further comprises the light source module according to claim 11 or 12, the light source module and the drive module are arranged in the housing, and the drive The module is electrically connected to the light source module.