KR20100028170A - Diffusion of light lens having back side diffuse emission means for led light - Google Patents

Abstract

PURPOSE: A diffusion of a light lens having back side diffuse emission means for an led light is provided to excellent product by radiating high brightness light and reducing manufacturing costs. CONSTITUTION: An aspherical lens(10) is combined in an end of an LED. The aspherical lens reflects, diffracts, and refracts the light through a diffusion sloped unit from the end of the LED and diffuses the light. A reflective coating unit(20) is formed on the diffusion sloped unit surface of the aspherical lens. The light from the LED is scattered to the side of the LED, reflected and diffused to the side and a rear side of the LED.

Description

LED light-diffusion lens having a back diffusing means of light {DIFFUSION OF LIGHT LENS HAVING BACK SIDE DIFFUSE EMISSION MEANS FOR LED LIGHT}

The present invention relates to an LED light diffusing lens having a back diffusing means of light.

In detail, the present invention arranges an aspherical lens for dispersing the light at the front end of the LED light at the widest possible angle, and emits the light on the surface of the aspherical lens at a wider angle. By providing a means for diffused emission, to reduce the number of LEDs used in the lighting equipment manufactured using the LED, to reduce the size of the lighting equipment, and to improve the reflectance and scattering rate of the light emitted from the LED, higher luminance The present invention relates to an LED light diffusing lens having a rear diffused emission means of light, which makes it possible to emit light, thereby lowering the manufacturing cost and obtaining a better product.

Lighting equipment for realizing the main lighting of the room has various forms. In particular, the light produced by a fluorescent lamp or a halogen lamp is exposed to the outside by the fluorescent lamp or the halogen lamp itself to illuminate the room by the light irradiated from the fluorescent lamp or the halogen lamp, or the front of the light emitted by the fluorescent lamp or the halogen lamp. The cover is arranged to allow the user to illuminate the room with the desired color or brightness of the light. However, in the case of the fluorescent lamp or halogen as described above, the amount of power consumed is large, and it is difficult to satisfy the demands of various lighting colors of the consumer, and the lighting fixture itself is largely enlarged due to the size of the fluorescent lamp or halogen lamp. Significant inconvenience is caused to be implemented in the interior lighting.

Therefore, conventionally, the lighting apparatus which uses the said fluorescent lamp or the halogen lamp as a light source is replaced by the structure of the form which uses LED as a light source. That is, such an LED light source consumes less power and can produce various colors of illumination, and in particular, due to the size of the LED device, a small lighting device can be manufactured. Therefore, the luminaire using the LED light source is in the spotlight as a next-generation lighting that is applied to interior lighting or various products in the room.

1 is a cross-sectional view of a lighting device using the LED.

Referring to the drawings, a conventional lighting device is equipped with a printed circuit board (P) mounted with a plurality of LED (L) is disposed inside the housing (1), and transmits the light emitted from the plurality of LED (L) Light transmission cover 2 for realizing the interior lighting is installed is configured.

In this case, the plurality of LEDs (L) is applied to the surface mount device (SMD) type of the advantageous form to be mounted on the printed circuit board (P). In particular, the configuration as described above will be referred to as "direct LED lighting device" because a plurality of LED (L) light is passed through the light transmission cover 2 and the lighting is implemented in the direct direction.

In the conventional direct-type LED lighting apparatus configured as described above, it is common that the angle at which the light of the LED is emitted maintains an angle of about 90 ° to 140 °. Therefore, the interval at which the plurality of LEDs are arranged and mounted on the printed circuit board is set by the light emission angle. That is, the interval setting is a large number of LEDs are arranged so that the interval between the LED is densely arranged so that the light is not broken when the light emitted from the LED is incident to the light transmission cover, so that the dark zone (dark zone) section is not generated. At the same time, the light transmitting cover must be disposed at a considerable distance from the LED to solve the dark area by overlapping the light emitted from the LED with the light emitted from the adjacent LEDs.

Accordingly, the lighting device is a factor to increase the manufacturing cost of the product according to the demand for a large number of LEDs, a considerable distance between the light transmission cover and the LED is exposed to the problem of increasing the size of the lighting device to enlarge the product.

In addition, the lighting device has a problem that the brightness is lowered when passing through the light-transparent cover of the fluid color, which is generally made of white because the lighting is implemented only by the light emitted through the LED.

The present invention has been invented to solve the above problems.

Accordingly, the present invention, by placing an aspherical lens at the front end of the light emitted from the LED so that the light can be emitted from the rear at the widest angle as possible, in particular, in the lateral and light portion of the light emitting surface of the aspherical lens By forming a reflective layer for reflecting and scattering to the rear side, the light is diffused at a wider angle to emit the rear side, and the luminance efficiency of the diffused light is improved, thereby reducing the number of LEDs used in the direct-type LED lighting equipment. The purpose of the present invention is to provide an LED light diffusing lens capable of miniaturizing the size of a lighting device and simultaneously emitting high luminance light.

In order to achieve the above object, the present invention has the following configuration.

The present invention is coupled to the front end of the LED, to be applied to a lighting device that is implemented by a direct light source method is arranged in a plurality of SMD-type LED on a printed circuit board, the light emitted from the LED is at the front end An aspherical lens formed to reflect, diffract, and refract through an inclined diffuser inclined inwardly to expand and emit light; It is formed on the surface of the inclined diffuser portion of the aspherical lens, and comprises a reflective coating for scattering and reflecting the light incident through the LED in the lateral direction to diffuse the light in the lateral direction and the rear surface.

At this time, the diffusion inclination portion is formed to be recessed to narrow the inner side on the center line that the light is emitted from the outer peripheral end of the lens body through which light is transmitted. In particular, the diffusion inclined portion is formed as a curved portion of the inclined surface recessed inward from the tip is raised toward the center side where the light is emitted.

In addition, the reflective coating is formed of a thin film layer on the surface of the diffusion inclined paint having a high reflectance of a certain color. Alternatively, the reflective coating part may be formed of a thin film layer on the surface of the diffusion inclination part by mixing a high reflectance paint with a synthetic resin having a transparent characteristic.

In this case, the reflective coating is a paint having a high reflectance of a certain color, it is applied to a non-ferrous metal paint such as silver, aluminum, gold, chromium, stainless, brass, zinc, magnesium alloy. In addition, the synthetic resin having the transparent properties may be applied to a resin that can be produced in a transparent material such as PC, PMMA, ABS, PS. On the other hand, the reflective coating is formed by any one of white coating, mirror coating, electroplating, vacuum deposition in order to form a thin film layer on the surface of the diffusion inclination portion.

In particular, the reflecting coating portion LED light diffusing lens having a light diffusion and emitting means, characterized in that the high reflectance paint is added in an amount of 30% by weight to 50% by weight relative to the total 100% by weight. In addition, the reflective coating is configured by adding a light diffusing agent to the light is scattered and reflected.

As described above, according to the present invention, an aspherical lens is disposed at the tip of the LED emitting light, and a reflective coating layer is formed on the front surface of the aspherical lens so that the light of the LED is diffused and emitted over a wider angular section with high brightness. In the light source type LED lighting device, the manufacturing cost of the product is reduced by reducing the number of LEDs installed, and the size of the product can be realized by reducing the gap between the LED and the light transmission cover.

In addition, the present invention has the effect that can be contributed to the production of excellent products by allowing light to be reflected and scattered in the reflective coating layer and diffused emission with a higher efficiency, to make a direct light source type LED lighting device of brighter illumination. .

Embodiments of the present invention as described above will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view of a lighting device to which the light diffusing lens according to the present invention is applied, FIG. 3 is a perspective view of the light diffusing lens according to the present invention, FIG. 4 is a sectional view of the light diffusing lens according to the present invention, and FIGS. 5A and 5B are shown. It is a graph showing a state in which light is emitted from the light diffusion lens according to the invention.

Referring to the drawings, the lighting device to which the light diffusing lens according to the present invention is applied is a printed circuit board mounted with a housing (1) which is an exterior and a plurality of LEDs (L) mounted inside the housing (1). (P) and a light transmission cover 2 mounted on an open portion of the housing 1 to transmit light emitted from the plurality of LEDs L to implement indoor lighting.

At this time, the light diffusion lens according to the present invention is coupled to the front end of the light emitted from the LED (L) to expand and emit the light of the LED (L) to the maximum.

In the above configuration, the light diffusing lens according to the present invention includes an aspherical lens 10 and a reflective coating 20 formed on the surface of the aspherical lens 10.

The aspheric lens 10 is coupled to the tip of the LED (L). At this time, the surface for the LED (L) is coupled to form a coupling groove or the like for fitting the end of the LED (L), or may be configured by the adhesive method. In addition, the aspherical lens 10 may be manufactured integrally with the body of the LED (L).

The aspherical lens 10 is recessed to form a diffused inclined portion 22 so as to narrow toward the inner side of the center line through which light is emitted from the outer circumference of the front end of the lens body 21 through which light is transmitted. In particular, the diffusion inclined portion 22 is formed of a curved portion 23 in which an inclined surface recessed inward from the tip is raised toward the emission center side of the light.

At this time, the inclination angle of the diffusion inclined portion 22 narrows inwardly is 38 ° to 42 ° in one reference plane with respect to the size of the total diameter 11 (mm) and the height 5.5 (mm) of the aspherical lens 10. It is preferable to form at an angle and to maintain an angle of 40 degrees. In addition, the curved portion 24 is formed with a curvature of R6 ~ R9 (mm), it is preferable to maintain the curvature of R8.

In the graph of FIG. 5A, the aspherical lens 10 is coupled to the LED L to configure an LED light source unit, and light of a predetermined color emitted from the LED L is emitted through the aspherical lens 10. Emission area obtained by keeping the ship vertically.

According to the graph, it can be seen that the light emitted through the LED light source unit according to the present invention is diffused and emitted at a maximum angle of 250 ° while the emission area is diffused and discharged at an angle of 180 ° or more.

The aspheric lens 10 is manufactured by mixing 0.01 parts by weight or more and 5 parts by weight or less of a light diffusing agent based on 100 parts by weight of the lens raw material resin. At this time, the raw material resin for manufacturing the lens is applied or selected by mixing one or more of resins, such as silicone, epoxy, PMMA, PC, PVC, ABS, PS that can produce a synthetic resin having a transparency can do.

The reflective coating 20 is formed on the surface of the diffuse inclined portion 22 of the aspherical lens 10 as a reflective layer of a thin film. The reflective coating unit 20 scatters and reflects the light incident through the LED (L) to the side and the rear to diffuse and emit light having a higher luminance to the side and the rear as shown in FIG. Configuration.

Here, the reflective coating 20 is formed of a thin film layer on the surface of the diffusion inclined portion 22 of the paint having a high reflectance of a certain color. At this time, the paint having a high reflectance of the predetermined color may be silver, aluminum, gold, chromium, stainless, brass, zinc, magnesium alloy and the like. All of these paints are nonferrous metal paints.

In particular, the reflective coating 20 as described above may be formed through a variety of conventional processes to be formed as a thin film layer on the surface of the diffusion inclination portion 22, for example, representative coating, white coating, mirror coating, electroplating And vacuum deposition can be exemplified.

In addition, the reflective coating 20 is manufactured by mixing a specific resin or admixture with a raw material in the form of powder or fine particles in order to maintain the above-described paint in a liquid or gel form. At this time, the high reflectance paint of the reflective coating 20 is added in an amount of 30% by weight to 50% by weight relative to the total 100% by weight of the reflective coating (20).

Here, when the content of the paint is less than 30% by weight, the reflectance is too low compared to the transmittance of light, so that it is difficult to obtain the desired high reflectance effect, and when it exceeds 50% by weight, the transmittance of light is excessively lowered so that the light is forward. The emitted efficiency is too low, resulting in lower brightness.

In addition, the reflection coating unit 20 is a light diffusing agent is added with the above-described paint to be scattered and reflected light is formed. At this time, the light diffusing agent is preferably added in an amount of 1% by weight to 10% by weight relative to the total 100% by weight of the reflective coating (20).

Here, when the light diffusing agent is less than 1% by weight, it is difficult to obtain a desired light scattering effect, and when it exceeds 10% by weight, the reflection efficiency of the coating part is rather lowered.

<Other Example 1>

Another embodiment 1 presents another process for forming the reflective coating 20.

The light diffusing lens of another embodiment proposes a configuration in which the reflective coating 20 mixes the above-described high reflectivity paint with a synthetic resin having transparent characteristics. At this time, the synthetic resin having the transparent properties may be a polymer resin, such as PC, PMMA, ABS, PS, etc., such a polymer resin is also formed as a thin film layer on the surface of the diffusion inclined portion 22 as in the original embodiment do.

Here, the reflective coating 20 of the other embodiment 1 may exemplify a process such as white coating, mirror coating, electroplating, vacuum deposition, as in the original embodiment, in particular, the reflective coating ( 20 may be formed by mixing a paint, a polymer resin, a light diffusing agent, and the like to form a thin film in advance and then combining it with the aspherical lens 10.

<Other Example 2>

Another embodiment 2 proposes a configuration in which a reflective surface can be formed in a lighting device to which the light diffusing lens is applied.

The reflective surface is formed by performing a white coating or a mirror coating on the surface of the printed circuit board on which the LED (L) to which the aspherical lens 10 is coupled is mounted. At this time, the reflective surface is reflected light propagated to the light transmission cover 2 side diffused to the lateral or rear surface to obtain a higher illumination efficiency.

In addition, the reflective surface is disposed between the aspherical lens 10 and the printed circuit board (10) by a separate reflector to the light diffused and emitted to the side and the rear by the aspherical lens 10 and the reflective coating (20). It is also possible to obtain a higher illumination efficiency by reflecting to the light transmission cover 2 side.

1 is a cross-sectional view of a lighting device using a conventional LED.

2 is a cross-sectional view of a lighting device to which the light diffusing lens according to the present invention is applied.

3 is a perspective view of a light diffusing lens according to the present invention;

4 is a sectional view of a light diffusing lens according to the present invention;

5A and 5B are graphs of light emission states in the light diffusing lens according to the present invention;

<Explanation of symbols for the main parts of the drawings>

10: aspherical lens 20: reflective coating

21: lens body 22: diffused inclined portion

23: Gradient L: LED

Claims (8)

In order to be applied to a lighting device that is implemented by the direct light source method by placing a plurality of SMD type LED (L) on the printed circuit board (P), An aspherical lens coupled to the front end of the LED (L) and formed so that the light emitted from the LED (L) is reflected, diffracted, and refracted through the diffusion inclination part 22 recessed inwardly from the front end to expand and emit the light ( 10); The reflection coating unit 20 is formed on the surface of the diffuse inclined portion 22 of the aspherical lens 10 and diffuses and reflects the light incident through the LED L in the lateral direction to diffuse and emit the light in the lateral and rear surfaces. ); LED light-diffusion lens having a back-diffusion emitting means of light comprising a. The method of claim 1, wherein the diffusion slope 22 LED light-diffusion lens having a rear diffused emission means of the light, characterized in that it is formed so as to be narrowed to the inner side on the center line that the light is emitted from the outer peripheral end of the lens body 21 through which light is transmitted. The method of claim 2, wherein the diffusion slope 22 An LED light diffusing lens having a rear diffused emission means of light, characterized in that the inclined surface recessed inward from the tip is formed as a curved portion 23 raised to the center side where light is emitted. The method of claim 1, wherein the reflective coating 20 An LED light-diffusion lens having a back diffusion-emitting means for light, characterized in that a paint having a high reflectance of a predetermined color is formed in a thin film layer on the surface of the diffusion inclination portion (22). The method of claim 1, wherein the reflective coating 20 An LED light-diffusion lens having a back diffusion-emitting means for light, characterized in that a high reflectance paint is mixed with a synthetic resin having a transparent characteristic to form a thin film layer on the surface of the diffusion inclination portion 22. The method of claim 4 or 5, wherein the reflective coating 20 An LED light-diffusion lens having a back diffused emission means of light, characterized in that the paint has a high reflectivity of a certain color, and is a nonferrous metal paint such as silver, aluminum, gold, chromium, stainless, brass, zinc, and magnesium alloy. 6. The synthetic resin according to claim 5, wherein the synthetic resin having transparent properties LED light-diffusion lens having a back-diffusion emitting means of light, characterized in that the resin can be made of a transparent material such as PC, PMMA, ABS, PS. The method of claim 4 or 5, wherein the reflective coating 20 LED light-diffusion lens having a back diffusion emitting means of light, characterized in that formed by any one of the process of white coating, mirror coating, electroplating, vacuum deposition to form a thin film layer on the surface of the diffusion inclined portion (22).

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