CN101718414B - A kind of lens for LED light source - Google Patents

Abstract

The invention discloses a lens for an LED light source, which comprises a first lens body and a second lens body which are integrally formed, wherein the central axes of the first lens body and the second lens body are superposed, the first lens body is cylindrical and is provided with an incident bottom surface for light to enter the first lens body and a reflecting side surface for light to be reflected in the first lens body; the second lens body is provided with an inner space which is symmetrical around the central axis of the second lens body, and the inner space is provided with an inner reflecting surface which enables the light entering from the incident bottom surface of the first lens body to be reflected by the reflecting side surface of the first lens body and then to be emitted out of the second lens body; the invention can carry out secondary light distribution on the dispersed light emitted by the LED so as to improve the light emitting efficiency of the LED and change the light distribution of the LED; meanwhile, the light source is extended out from the position of the substrate, so that the second lens body becomes a secondary light source with a larger irradiation area, and the application field of the LED is expanded.

Description

A kind of lens for LED light source

technical field

The invention relates to a lens, in particular to a lens used for an LED light source.

Background technique

LED (Light Emitting Diode) has been widely used as a lighting source. Due to the special light-emitting principle of LED, the energy consumed by it to achieve the same brightness is far lower than that of ordinary incandescent lamps. With further breakthroughs in key technologies, the light efficiency of LED may be further improved, greatly surpassing all current lighting The light effect of the light source has an attractive prospect in lighting. However, due to the small power of a single LED and the uneven light emitted by the LED, it is necessary to combine several LEDs and perform secondary light distribution on the scattered light emitted by the optical lens to improve the light output efficiency of the LED and change the light distribution of the LED; At the same time, due to the small size of the LED, it needs to be installed on the substrate, so the irradiation area of the traditional LED is greatly limited due to the influence of the substrate, thereby limiting the application field of the LED. Therefore, it is necessary to develop a lens for the LED light source, which can not only perform secondary light distribution on the scattered light emitted by the LED, but also lead out the LED light source to increase the irradiated area of the LED.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a lens for LED light sources, which can not only perform secondary light distribution on the scattered light emitted by LEDs, but also lead out the LED light sources to increase the irradiation area of LEDs.

The technical solution adopted by the present invention to solve its technical problems is:

A lens for an LED light source, characterized in that it includes an integrally formed first lens body and a second lens body, the central axes of the first lens body and the second lens body coincide, wherein the first lens body is cylindrical , which has an incident bottom surface for the light to enter the first lens body and a reflection side for the light to reflect in the first lens body; the second lens body has an internal space, and the internal space is symmetrical around the central axis of the second lens body, The internal space has the internal reflection surface that makes the light entering from the incident bottom surface of the first lens body reflected by the reflective side of the first lens body and then exit the second lens body, and the apex of the internal space is located on the first lens body. top surface.

As a preferred embodiment of the present invention, the incident bottom surface of the first lens body is a plane.

As a more preferred embodiment of the present invention, the first lens body is in the shape of a cylinder, the inner space of the second lens body is in the shape of a cone, and the diameter of the bottom surface of the cone-shaped inner space is greater than or equal to the diameter of the first lens body.

As an improvement to the above embodiments of the present invention, the apex of the conical inner space is located on the top surface of the first lens body.

The second lens body of the present invention may adopt a circular arc shape.

The beneficial effects of the present invention are: the present invention organically combines the first lens body and the second lens body, and performs secondary light distribution on the dispersed light emitted by the LED, so as to improve the light extraction efficiency of the LED and change the light distribution of the LED; at the same time, through the second A lens body leads the light source out from the position of the substrate, and reflects the light out of the second lens body through the internal reflection surface of the second lens body, making the second lens body a secondary light source with a larger irradiation area, thereby expanding the LED's application field.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a three-dimensional schematic diagram one of the present invention;

Fig. 2 is a three-dimensional schematic diagram II of the present invention;

Fig. 3 is a sectional view of the present invention.

Detailed ways

Referring to Fig. 1 to Fig. 3, the preferred embodiment of the present invention is shown in the figure. The lens for LED light source provided by this embodiment includes integrally formed first lens body 1 and second lens body 2. , the second lens body 2 is located at the end of the first lens body 1, and the central axes of the first lens body 1 and the second lens body 2 coincide, and the bottom side of the first lens body 1 is provided with the present invention fixedly mounted on Mounting part 3 above the LED light source.

As shown in the figure, the first lens body 1 is in the shape of a cylinder, and the length of the cylinder can be determined according to actual needs. Of course, the first lens body can also be in other polygonal cylinder shapes, which will not be described in detail here. The first lens body 1 has an incident bottom surface 11 for the light to enter the first lens body 1 and a reflective side surface 12 for the light to reflect in the first lens body. In the embodiment shown in the figure, the incident bottom surface 11 is a plane.

The second lens body 2 can be arc-shaped, or other shapes can be adopted. The second lens body 2 has an internal space 21, which is symmetrical around the central axis of the second lens body 2. The internal space 21 has a Internal reflection surface 211, this internal reflection surface 211 can be a total reflection surface, so that the light that enters from the incident bottom surface of the first lens body is reflected by the reflection side of the first lens body and then the reflected light is emitted out of the second lens body, that is, It is said that the actual light source—the light emitted by the LED is stretched out, so that the second lens body becomes a secondary light source with a larger irradiated area, and the irradiated area of the LED is increased. The inner space of the second lens body is equivalent to the tungsten wire in the iodine tungsten lamp or the incandescent lamp, until the role of luminescence.

In the embodiment shown in the figure, the internal space 21 of the second lens body 2 is conical, and the bottom surface 212 diameter of this conical internal space 21 is greater than or equal to the diameter of the first lens body, and the conical internal space 21 The apex can be located on the top surface of the first lens body 1 to ensure that all light rays reflected by the first lens body can be reflected from the second lens body from the internal reflection surface. Of course, the apex of the conical inner space 21 may also be located in other positions within the second lens body.

Of course, the inner space can also be in other shapes, for example, the generatrix can be in the shape of an inwardly curved arc, a polygonal pyramid, and the like.

The optical principle of the present invention is as follows: the light emitted by the LED is projected on the internal reflection surface of the second lens body after being reflected once or multiple times by the reverse side of the first lens body, and then the reflected light is emitted out of the second lens body through the internal reflection surface. Two lens bodies, so that the scattered light emitted by the LED is distributed twice to improve the light output efficiency of the LED and change the light distribution of the LED; at the same time, the light source is drawn out from the substrate position through the first lens body, and passed through the second lens body The internal reflective surface of the LED reflects the light out of the second lens body, so that the second lens body becomes a secondary light source with a larger irradiation area, thereby expanding the application field of the LED. And the present invention can mix the light of three primary colors (RGB) by reflecting the light, so as to form a white LED light source.

Claims (4)

1. A lens for an LED light source, characterized in that it comprises an integrally formed first lens body and a second lens body, the central axes of the first lens body and the second lens body coincide, wherein the first lens body is Cylindrical shape, which has an incident bottom surface for light to enter the first lens body and a reflective side for light to reflect in the first lens body; the second lens body has an inner space, and the inner space surrounds the central axis of the second lens body Symmetrical, the internal space has a light that enters from the incident bottom surface of the first lens body is reflected by the reflective side of the first lens body, and then the reflected light exits the internal reflection surface of the second lens body, and the apex of the internal space is located at the first lens top of the body. 2. A lens for LED light source according to claim 1, characterized in that the incident bottom surface of the first lens body is a plane. 3. A lens for an LED light source according to claim 1, wherein the first lens body is in the shape of a cylinder, the inner space of the second lens body is in the shape of a cone, and the inner space of the cone is The diameter of the bottom surface is greater than or equal to the diameter of the first lens body. 4. A lens for an LED light source according to claim 1, wherein the second lens body is in the shape of an arc.

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