CN102200253A - A kind of optical lens for LED - Google Patents

Abstract

The invention discloses an optical lens for an LED, which comprises a cylindrical lens body and is characterized in that the lens body is provided with a convex incident surface and an internal space, and the internal space is provided with an internal reflecting surface which enables light rays entering from the convex incident surface to be reflected out of the lens body; the LED light source comprises a light source body, a convex incidence surface and a light source reflection surface, wherein the light source body is provided with a light source opening, the light source reflection surface is arranged on the light source reflection surface, the light source reflection.

Description

A kind of optical lens for LED

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 by the influence of the substrate, although the LED light source can be extended to increase the irradiation area of the LED in the prior art. The lens, but this lens will also play a role in scattering light, so that the brightness in the effective area of the LED light source is reduced, so there is a disadvantage of low luminous efficiency.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides an optical lens for LED, which can improve the brightness and uniformity in the effective area of the LED light source, so as to improve the luminous efficiency of the LED.

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

An optical lens for LEDs, comprising a cylindrical lens body, characterized in that the lens body has a convex incident surface and an internal space, the internal space has the ability to reflect light entering from the convex incident surface The internal reflective surface of the lens body.

As an improvement of the above technical solution of the present invention, an LED chip installation space is provided on the lens body, the LED chip installation space has a side surface capable of refracting light, and the raised incident surface is located at the bottom of the LED chip installation space.

The central axis of the above-mentioned lens body has a through hole, and the through hole communicates with the inner space and the LED chip installation space.

The above-mentioned internal space may be conical.

As a preferred embodiment of the present invention, the convex incident surface is a closed curved surface formed by rotating a straight line and an arc around the central axis of the cylindrical lens.

As another preferred embodiment of the present invention, the convex incident surface is a closed curved surface formed by rotating a circular arc around the central axis of the cylindrical lens.

The beneficial effect of the present invention is: the present invention can make the light emitted by the LED light source refracted by the raised incident surface to form a parallel beam projected to the internal reflective surface of the internal space through the light concentrating effect of the raised incident surface. The reflective surface reflects the light, which not only increases the irradiation area of the LED light source, from 180 degrees to 300 degrees of the LED, replacing the irradiation range of the traditional Wusi electric bulb, but also improves the brightness and uniformity of the effective area of the LED light source. Degree, improve the LED luminous efficiency.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is further described:

Fig. 1 is a sectional view of an embodiment of the present invention;

Fig. 2 is a partial enlarged view in Fig. 1;

Fig. 3 is a perspective view of a second embodiment of the present invention;

FIG. 4 is a sectional view of FIG. 3 .

Detailed ways

Referring to Fig. 1 and Fig. 2, Fig. 1 and Fig. 2 are schematic structural views of the first embodiment of the present invention, the optical lens for LED shown in the figure includes a cylindrical lens body 1, and the cylindrical lens body 1 It can be conical or cylindrical, and the height of the cylindrical lens body 1 can be determined according to actual needs. Of course, the cylindrical lens body can also be in other polygonal cylindrical shapes, and the lens body 1 has a convex incident surface 11 And an internal space 12, the internal space 12 has the internal reflective surface 121 that makes the light that enters from the incident surface reflect the lens body, the internal space 12 can be conical, and can also be other shapes, such as can adopt the generatrix It is the shape of an inner curved arc, a polygonal pyramid, etc.

As shown in Figure 2, the convex incident surface 11 can be a closed curved surface formed by a straight line 111 and an arc 112 rotating around the central axis of the cylindrical lens, or it can be formed by an arc around the cylindrical lens. A closed curved surface formed by rotating the central axis of the body for one revolution. The incident surface formed by the closed curved surface can gather light from the LED light source.

As shown in the figure, an LED chip installation space 13 is provided on the lens body 1 . The LED chip installation space has a side surface 131 capable of refracting light. The raised incident surface 11 is located at the bottom of the LED chip installation space 13 .

The working principle of this embodiment is: some light rays rush to the lens body from the incident surface 11, and are focused and refracted to the internal reflection surface 121 of the internal reflection space through the incident surface. It is emitted from the internal reflection surface, and part of the light is reflected by the internal reflection surface and emitted from the side of the lens body; in addition, a part of the light enters the lens body from the side 131, and after being refracted by the side 131, the light is directly emitted from the side of the lens body, thereby improving LED performance. The irradiated area of the light source can reach 300 degrees, and at the same time, the brightness and uniformity in the effective area of the LED light source are also improved, and the luminous efficiency of the LED is improved.

Referring to Fig. 3 and Fig. 4, Fig. 3 and Fig. 4 are structural schematic diagrams of the second embodiment of the present invention, the structure of this embodiment is basically the same as that of the first embodiment, the difference lies in the central axis of the lens body 1 There is a through hole 14 at the position, and the through hole communicates with the internal space and the LED chip installation space, which improves the luminous efficiency of the LED.

The working principle of the second embodiment is: some light rays rush from the incident surface 11 to the lens body, and are focused and refracted to the internal reflection surface 121 of the internal reflection space through the incident surface, and these light rays are divided into two parts by the internal reflection surface 121: A part of the light is directly emitted from the internal reflective surface, and a part of the light is reflected by the internal reflective surface and emitted from the side of the lens body; in addition, a part of the light enters the lens body from the side 131, and after being refracted by the side 131, the light is directly emitted from the side of the lens body. Part of the light is directly emitted from the middle through hole, thereby increasing the irradiated area of the LED light source, and the irradiated area can reach 300 degrees. At the same time, the brightness and uniformity of the effective area of the LED light source are also improved, and the luminous efficiency of the LED is improved.

Claims (6)

1. optical lens that is used for LED, comprise a cylinder shape lenticular body, it is characterized in that lenticular body has the plane of incidence and an inner space of a projection, this inner space has the internal reflection surface that the feasible light that enters from this protruding plane of incidence reflects this lenticular body.

2. a kind of optical lens that is used for LED according to claim 1, it is characterized in that described lenticular body is provided with the led chip installing space, this led chip installing space has the side of refrangible light, and the plane of incidence of described projection is positioned at the bottom of this led chip installing space.

3. a kind of optical lens that is used for LED according to claim 2 is characterized in that the middle shaft position of described lenticular body has a through hole, and this through hole is communicated with this inner space and led chip installing space.

4. a kind of optical lens that is used for LED according to claim 1 is characterized in that the inner space is cone shape.

5. a kind of optical lens that is used for LED according to claim 1 and 2, the plane of incidence that it is characterized in that described projection are around the cylinder shape lenticular body axis formed occluding surface that rotates a circle by a straight line and a camber line.

6. a kind of optical lens that is used for LED according to claim 1 and 2, the plane of incidence that it is characterized in that described projection are around the cylinder shape lenticular body axis formed occluding surface that rotates a circle by circular arc line.

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