CN108692293A - A kind of LED free-form surface lens - Google Patents

Abstract

The invention discloses an LED free-form surface lens. The lens (200) is composed of several first reflection surfaces (21) and several second refraction surfaces (22); the first reflection surface (21) is arranged on the The bottom of the lens (200), the second refraction surface (22) is arranged on the top of the lens (200) relative to the first reflection surface (21), and the first reflection surface (21) surrounds and forms a reflection A surface cavity, the second refraction surface (22) is surrounded to form a refraction surface cavity, and the reflective surface cavity and the refraction surface cavity form a lens cavity. The inner surface of the lens cavity is a hemispherical surface; the outer surface of the second refraction surface (22) is smooth; the cross-sectional area of the second refraction surface (22) is gradually reduced from bottom to top. The invented LED free-form surface lens can realize the uniform illumination of the three-petal-shaped limited light pattern in the far and near fields, and has high efficiency and uniformity.

Description

A LED free-form surface lens

technical field

The invention relates to the field of optics, in particular to an LED free-form surface lens.

Background technique

LED light sources are generally Lambertian distributed, and direct lighting cannot achieve uniform lighting. There are many ways to distribute light to LEDs, and the optical system is composed of designed reflective cups and lenses. Among them, there are spherical lenses and free-form surface lenses. Compared with spherical lenses, free-form surface lenses can better control the divergence angle of the light source, so as to better meet the lighting requirements.

At present, a type of LED free-form surface lens can realize the limited illumination of the target surface, and has a certain luminous flux utilization rate, but the uniformity is not high. Surfaces cannot better eliminate the problem of Lambertian uneven distribution.

Another type of lens that achieves uniform illumination with limited light type uses advanced mathematics to establish a partial differential equation to design the lens. This type of lens has high efficiency and high uniformity in the far field, but the uniformity in the near field is not good. The lens design method is complex and requires high manufacturing and processing technology.

Contents of the invention

The purpose of the present invention is to provide an LED free-form surface lens, which can achieve light patterns of different shapes in the far and near fields to define uniform illumination, and the lens has high efficiency.

The technical solution adopted in the present invention: an LED free-form surface lens, the lens (200) is composed of several first reflection surfaces (21) and several second refraction surfaces (22); the first reflection surface (21) It is arranged on the bottom of the lens (200), the second refraction surface (22) is arranged on the top of the lens (200) relative to the first reflection surface (21), and the first reflection surface (21) A reflective surface cavity is formed around the second refraction surface (22), and the refraction surface cavity is formed around the second refraction surface (22), and the reflective surface cavity and the refraction surface cavity form a lens cavity.

Preferably, the inner surface of the lens cavity is a hemispherical surface.

Preferably, the outer surface of the second refraction surface (22) is smooth.

Preferably, the cross-sectional area of the second refraction surface (22) is gradually reduced from bottom to top.

Preferably, the outer surface of the first reflective surface (21) is smooth.

Preferably, the cross-sectional area of the first reflective surface (21) is gradually increased from bottom to top.

Preferably, the transition between the first reflecting surface (21) and the second refracting surface (22) is smooth.

Preferably, the lower end of the lens (200) is provided with a light source inlet; the center of the inner surface of the lens (200) is provided with an LED light source (100).

Preferably, the LED light source (100) is composed of an LED chip (11) and a PCB substrate (12).

Preferably, the lens (200) is PC or PMMA.

Compared with the prior art, the beneficial effect of the present invention is: the LED free-form surface lens of the present invention, by setting several first reflecting surfaces and several second refracting surfaces, combined with an LED light source, can realize the three-petal-shaped limited light in the far and near fields. type of uniform illumination, and has higher efficiency and uniformity, specifically, the combination of the first refraction and reflection surface and the second refraction surface constitutes the outer surface of the lens, and the light emitted by the LED light source is refracted to the second lens through the inner surface of the lens. A reflective surface is refracted by the first reflective surface and then refracted by the second refracting surface to realize uniform illumination of different shapes, and can realize uniform illumination of different shapes according to the number of the first reflective surface and the number of second refracting surfaces.

Description of drawings

Fig. 1 is the perspective view of LED free-form surface lens of the present invention;

Fig. 2 is a side sectional view of the whole LED free-form surface lens of the present invention;

Fig. 3 is the top view of LED free-form surface lens of the present invention;

Fig. 4 is the bottom view of the LED free-form surface lens of the present invention;

Fig. 5 is the front view of the LED free-form surface lens of the present invention;

Fig. 6 is a schematic diagram of light emission from the LED free-form surface lens of the present invention;

Fig. 7 is an illumination diagram of petal light pattern simulated and formed by the LED free-form surface lens of the present invention in a software environment.

Reference signs: LED light source (100), LED chip (11), PCB substrate (12), LED free-form surface lens (200), lens inner surface (1), lens outer surface (2), first reflective surface (21 ), the second refraction surface (22).

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

As shown in Figure 1-7, a LED free-form surface lens, the lens (200) is composed of several first reflective surfaces (21) and several second refraction surfaces (22); the first reflective surface (21) It is arranged on the bottom of the lens (200), the second refraction surface (22) is arranged on the top of the lens (200) relative to the first reflection surface (21), and the first reflection surface (21) A reflective surface cavity is formed around, and the second refraction surface (22) is surrounded to form a refraction surface cavity, and the reflective surface cavity and the refraction surface cavity form a lens cavity, and the interior of the lens cavity The wall surface is the inner surface (1) of the lens.

In the specific technical solution of the present invention, the inner surface (1) of the lens is a hemispherical surface, so that when the LED light source (100) is refracted by the inner surface (1) of the lens at an angle of 180 degrees, the incident light does not change direction, such a design realizes the collection of light from all angles of the LED light source (100), improving the utilization rate of luminous flux.

Further, the outer surface of the second refraction surface (22) is smooth, and the cross-sectional area of the second refraction surface (22) is gradually reduced from bottom to top. The light emitted by the LED light source (100) at a partial angle is refracted by the lens inner surface (1) and then reflected by the first reflective surface (21). The outer surface of the first reflective surface (21) is smooth. This design makes the light with a large angle enter the free-form surface lens through the inner surface (1) of the lens and reflects inward for the first time, which improves the light pattern at least to a certain extent. brightness.

Further, the cross-sectional area of the first reflective surface (21) is gradually increased from bottom to top, and the transition between the first reflective surface (21) and the second refraction surface (22) is smooth. This design prevents stray light from occurring when the target surface is illuminated, thereby improving uniformity. The first refraction surface and the second refraction surface (22) are free-form surfaces. The outer surface (2) of the LED free-form surface lens is composed of the first reflection surface (21) and the second refraction surface (22), thereby better eliminating the uneven distribution of the LED light source (100) Lambertian The effect improves the uniformity of illumination.

The lower end of the lens (200) is provided with a light source inlet; the center of the inner surface of the lens (200) is provided with an LED light source (100), and the LED light source (100) is composed of an LED chip (11) and a PCB substrate (12). into a whole. The light emitted by the LED light source (100) enters from the light source entrance, and the light emitted by the LED light source (100) is refracted to the first reflective surface (21) through the inner surface (1) of the lens, passes through the first reflective surface (21) and then passes through the second reflective surface (21). The refraction surface (22) refracts out, wherein the quantity of the first reflection surface (21) and the second refraction surface (22) can be changed according to the shape needs, for example, when the first reflection surface (21) and the When the number of the second refraction surface (22) is four, it can realize the uniform illumination of the three-petal-shaped light pattern in the far and near field, and has higher efficiency and uniformity, as shown in Figure 7, which is formed by simulation in the software environment Lighting diagram of the petal light pattern. The lens (200) is made of PC or PMMA. On the premise of ensuring the transparency of the LED lens, the processing difficulty of the LED lens is simplified, and the wear resistance and electrical insulation of the LED lens are improved.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Example

The LED light source (100) and the LED free-form surface lens (200) of the present invention will be described in detail below with reference to Fig. 1 to Fig. 6 .

An LED free-form surface lens, the lens (200) is composed of several first reflection surfaces (21) and several second refraction surfaces (22); the first reflection surface (21) is arranged on the lens (200) The bottom of the lens (200), the second refraction surface (22) is arranged on the top of the lens (200) relative to the first reflection surface (21), and the first reflection surface (21) is surrounded to form a reflection surface cavity, The second refraction surface (22) surrounds and forms a refraction surface cavity, and the reflection surface cavity and the refraction surface cavity form a lens cavity, and the inner wall surface of the lens cavity is the lens inner surface ( 1).

The LED light source (100) of this embodiment, as shown in Figure 1, includes: an LED chip (11) and a PCB substrate (12), the LED chip (11) is located on the PCB substrate (12), and the LED chip (11) is combined with the PCB substrate (12) to form a whole.

It should be noted that the LED light source (100) is only indicative of a light source that cooperates with the LED free-form surface lens (200), wherein the LED light source (100) refers to the same or similar LED light source or similar components or components with similar functions. The LED light source (100) can be a circular surface light source or a surface light source of other shapes, unless otherwise specified, which should not be construed as a limitation of the present invention.

The LED free-form surface lens (200) according to the embodiment of the present invention includes a lens inner surface (1) and a lens outer surface (2). As shown in Figure 1, Figure 2, and Figure 4, the inner surface of the lens (1) is a hemispherical surface, so that the light of the LED light source (100) is refracted by the inner surface of the lens (1) at an angle of 180 degrees but does not change The direction of the incident light. Such an arrangement collects light from all angles of the LED light source (100), improving the utilization rate of luminous flux.

As shown in Figures 1 to 6, the outer surface (2) of the lens is composed of a first reflection surface (21) and a second refraction surface (22). Specifically, the cross-sectional area of the first reflective surface (21) gradually increases from bottom to top. Such a design makes the light emitted by the LED light source (100) with a large angle enter the free-form surface lens (200) through the inner surface of the lens (1) and then reflected inward for the first time, which improves the brightness of the light pattern at least to a certain extent.

Further, the outer surface of the first reflecting surface (21) is smooth, and the transition between the first reflecting surface (21) and the second refracting surface (22) is smooth, so that stray light does not occur when the target surface is illuminated, thereby improving uniformity .

As shown in Fig. 5 and Fig. 6, the cross-sectional area of the second refraction surface (22) gradually decreases from bottom to top, and the outer surface of the second refraction surface (22) is smooth; the outer surface (2) of the LED free-form surface lens (200) The combination of the first reflection surface (21) and the second refraction surface (22) can better eliminate the influence of the uneven distribution of the LED light source (100) Lambertian, and improve the uniformity of illumination.

In some examples of the present invention, the LED free-form surface lens (200) is PC (ie, polycarbonate) or PMMA (ie, polymethyl methacrylate). On the premise of ensuring the transparency of the LED free-form surface lens (200), the processing difficulty of the LED free-form surface lens (200) is simplified, and the wear resistance and electrical insulation of the LED lens (200) are improved.

Of course, the material selection of the LED free-form surface lens (200) in this example is only a preferred implementation manner, and designers can select the material of the LED free-form surface lens (200) according to actual needs.

For those skilled in the art, various other corresponding changes and modifications can be made according to the technical solutions and ideas described above, and all these changes and modifications should fall within the protection scope of the claims of the present invention.

Claims (10)

1. A LED free-form surface lens, characterized in that: the lens (200) is made up of some first reflective surfaces (21) and some second refraction surfaces (22); the first reflective surface (21) is arranged on The bottom of the lens (200), the second refraction surface (22) is arranged on the top of the lens (200) relative to the first reflection surface (21), and the first reflection surface (21) surrounds A reflection surface cavity is formed, the second refraction surface (22) is surrounded to form a refraction surface cavity, and the reflection surface cavity and the refraction surface cavity form a lens cavity. 2. The LED free-form surface lens according to claim 1, wherein the inner surface of the lens cavity is a hemispherical surface. 3. The LED free-form surface lens according to claim 1, characterized in that: the outer surface of the second refracting surface (22) is smooth. 4. The LED free-form surface lens according to claim 1, characterized in that: the cross-sectional area of the second refracting surface (22) gradually decreases from bottom to top. 5. The LED free-form surface lens according to claim 1, characterized in that: the outer surface of the first reflective surface (21) is smooth. 6. The LED free-form surface lens according to claim 1, characterized in that: the cross-sectional area of the first reflective surface (21) gradually increases from bottom to top. 7. The LED free-form surface lens according to claim 1, characterized in that the transition between the first reflecting surface (21) and the second refracting surface (22) is smooth. 8. The LED free-form surface lens according to claim 1, characterized in that: the lower end of the lens (200) is provided with a light source inlet; and the center of the inner surface of the lens (200) is provided with an LED light source (100). 9. The LED free-form surface lens according to claim 8, characterized in that: the LED light source (100) is composed of an LED chip (11) and a PCB substrate (12). 10. The LED free-form surface lens according to claim 1, characterized in that: the lens (200) is made of PC or PMMA.