KR20130003853A - Lighting apparatus using light emitting diode - Google Patents

Lighting apparatus using light emitting diode Download PDF

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Publication number
KR20130003853A
KR20130003853A KR1020110065463A KR20110065463A KR20130003853A KR 20130003853 A KR20130003853 A KR 20130003853A KR 1020110065463 A KR1020110065463 A KR 1020110065463A KR 20110065463 A KR20110065463 A KR 20110065463A KR 20130003853 A KR20130003853 A KR 20130003853A
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KR
South Korea
Prior art keywords
light emitting
emitting diode
light
light guide
diffusion lens
Prior art date
Application number
KR1020110065463A
Other languages
Korean (ko)
Inventor
정대일
고현진
Original Assignee
정대일
고현진
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 정대일, 고현진 filed Critical 정대일
Priority to KR1020110065463A priority Critical patent/KR20130003853A/en
Publication of KR20130003853A publication Critical patent/KR20130003853A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/237—Details of housings or cases, i.e. the parts between the light-generating element and the bases; Arrangement of components within housings or cases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/008—Combination of two or more successive refractors along an optical axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2101/00—Point-like light sources

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

PURPOSE: A lighting device using a light emitting diode is provided to implement illumination like an incandescent lamp with low power by forming a diffused reflection surface in the central part of the lighting device. CONSTITUTION: A light emitting diode(10) is mounted on a printed circuit board. A light guide(20) includes an accommodating chamber and a supporting part. The light guide transmits the light generated from the light emitting diode. A diffusion lens(30) includes a first surface and a second surface. The second surface has a diffused surface(33).

Description

Lighting apparatus using light emitting diodes

The present invention relates to a lighting apparatus using a light emitting diode, and more particularly to a lighting apparatus using a light emitting diode having a light distribution characteristic similar to a conventional incandescent lamp.

Light emitting diodes are more energy efficient than fluorescent lamps and have environmentally friendly advantages. Therefore, efforts have been made to replace existing lighting fixtures with lighting using light emitting diodes. However, there are many considerations in optical design in order to use light emitting diodes in lighting. Light emitting diodes in the form of high power surface mount devices (SMDs) generally have light distribution characteristics in the form of Lambertians. Therefore, it is not suitable for use for lighting.

In order to solve this problem, attempts have been made to adjust light distribution characteristics of the light emitting diode by using a reflector or a lens.

An object of the present invention is to provide a lighting device using a light emitting diode, which is much lower in power consumption than a conventional incandescent lamp, and has a light distribution characteristic similar to that of an incandescent lamp.

In order to achieve the above object, the present invention provides a light emitting diode mounted on a printed circuit board, a barrel having a bulging side surface, and an accommodating portion accommodating the light emitting diode at one end and the accommodating portion at the accommodating portion. A support portion extending in a direction, the inner surface of the receiving portion facing the light emitting diode is a concave surface, a light guide for transmitting light generated by the light emitting diode, a first surface in contact with the light guide and a first surface thereof; It is provided with a second surface spaced apart from the second surface provides a lighting device using a light emitting diode comprising a diffused lens, the concave diffuse reflection surface is formed to diffuse the light transmitted through the light guide.

Preferably, the support portion is open at a portion of the side surface to dissipate heat generated by the light emitting diode.

Preferably, the light guide and the diffusion lens are integrated.

The present invention also provides a lighting device using a light emitting diode further comprising a reflector disposed between the first surface of the diffusion lens and the printed circuit board to reflect light diffused from the lens.

In addition, the surface of the diffuse reflection surface of the diffusion lens is roughly processed to cause diffuse reflection, and the remaining surface is provided with a light emitting diode using a smoothly processed to cause total reflection.

In addition, the first surface of the diffusion lens is provided with an illumination device using a light emitting diode having a larger diameter than the light guide.

The cross-section of the diffuse reflection surface is preferably in the form of a combination of two curves, like a seagull wing.

The lighting apparatus according to the present invention has a diffuse reflection surface that shines brightly in the center of the lighting apparatus, like the filament of an incandescent lamp. Thus, light distribution characteristics similar to incandescent lamps can be realized at much lower power.

In addition, the lighting apparatus according to the present invention can minimize the loss of light of the light emitting diode to the outside of the light guide by using a barrel-shaped light guide having a light-emitting diode receiving portion having a concave surface.

1 is a perspective view of an embodiment of a lighting apparatus using a light emitting diode according to the present invention.
FIG. 2 is a bottom perspective view of a portion of a lighting apparatus using the light emitting diode shown in FIG. 1.
3 is a cross-sectional view of a portion of a lighting apparatus using the light emitting diode shown in FIG.
4 is a plan view of a portion of a lighting apparatus using the light emitting diode shown in FIG.
5 is a conceptual diagram for explaining the function of the concave surface.
6 is a conceptual diagram for explaining the function of the light guide.
FIG. 7 is a view for explaining a state in which power is applied to the lighting apparatus using the light emitting diode shown in FIG. 1.
FIG. 8 is a view for explaining a path of light in the light emitting diode of FIG. 1.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention.

The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the width, length, thickness, and the like of the components may be exaggerated for convenience. Like numbers refer to like elements throughout.

1 is a perspective view of an embodiment of a lighting apparatus using a light emitting diode according to the present invention, Figure 2 is a bottom perspective view of a part of the lighting apparatus using a light emitting diode shown in Figure 1, Figure 3 is a light emitting shown in Figure 1 A cross-sectional view of a portion of a lighting device using a diode, and FIG. 4 is a plan view of a portion of the lighting device using a light emitting diode shown in FIG. 1 to 4, an embodiment of a lighting apparatus using a light emitting diode according to the present invention is a light emitting diode 10 mounted on a printed circuit board 1, a light guide for transmitting light of the light emitting diode 10. 20, a diffusion lens 30 for diffusing light transmitted through the light guide 20, and a reflector 40 disposed on the printed circuit board 1. It comprises a glass sphere or plastic sphere (3) surrounding the base 2 and the light guide 20 and the diffusion lens 30 for connecting to other power sources.

The light emitting diode 10 is a semiconductor device in which electrons in an n region of a semiconductor and holes in a p region meet and emit light. In general, a light emitting diode device irradiates light to the front surface, and the intensity of irradiated light is the strongest in the central axis part. In the present invention, the light emitting diode 10 may be mounted directly on the printed circuit board 1, or may be mounted on the submount 11 mounted on the printed circuit board 1 as shown in FIG. . The submount 11 may be ceramic or silicon with metal leads. In addition, the light emitting diode 10 may further include a lens 12 molded directly. Lens 12 may be a material such as optically transparent silicone, epoxy, or the like.

In the present invention, the light emitting diode 10 is mounted on the printed circuit board 1 is not only mounted directly on the printed circuit board 1 but also mounted on the submount 11 mounted on the printed circuit board 1. It includes being.

The light guide 20 serves to minimize and transmit all the light generated from the light emitting diode 10 as a light source to the diffusion lens 30 positioned at the center of the lighting device. The light guide 20 is made of transparent plastic or glass such as acrylic resin, polycarbonate, epoxy, or the like. The light guide 20 utilizes a phenomenon in which total reflection occurs when the incident angle is greater than or equal to a threshold value when the light proceeds from a dense medium to a low medium. In the general light guide, light having an incident angle of about 42 ° or more is totally reflected in the light guide. Proceed.

1 and 3, the light guide 20 is coupled onto the printed circuit board 1 to surround the light emitting diode 10. On one surface of the light guide 20, a receiving portion 21, which is a space for accommodating the light emitting diodes 10, is formed. The surface facing the light emitting diode 10 among the inner surfaces of the accommodating portion 21 is formed of a smooth concave surface 22. The concave surface 22 is formed to minimize the light emitted from the light emitting diode 10 through the side of the light guide 20.

FIG. 5A illustrates a path of light generated by the light emitting diode when the inner surface of the housing part is flat, and FIG. 5B illustrates a path of light generated by the light emitting diode when the inner surface of the housing part is a concave surface. Indicates.

As can be seen from FIG. 5, the incident angle θ 1 in case (a) is smaller than the incident angle θ 2 in case (b). As a result, in the case of (a), some of the light emitted from the light emitting diode, which is far from the central axis, is incident on the side of the light guide at an incident angle below the threshold value and is lost. In the case of (b), since the light emitted from the light emitting diode is far from the central axis, the light is collected in the direction of the central axis by the concave surface, so that less light is lost to the side of the light guide than in the case of (a).

1 to 3, the light guide 20 includes a support 23 extending from the receiving portion 21 toward the printed circuit board 1. The side surface of the support part 23 surrounds the submount 11 on which the light emitting diode 10 is mounted, and the bottom surface of the support part 23 is in contact with the printed circuit board 1. The support part 23 is characterized in that a part of its side is open so that heat generated in the light emitting diode 10 can be easily removed.

In the present invention, the light guide 20 is in the form of a barrel with a bulging side. The reason for selecting the barrel shape is to minimize the loss of light generated from the light emitting diode 10 to the side surface of the light guide body 20, like the concave surface 22 of the accommodating portion 21. 6 (a) shows a path of light generated in the light emitting diode when the cylindrical light guide is used, and (b) shows a path of light generated in the light emitting diode when the barrel light guide is used. As can be seen from FIG. 6, the incident angle θ a in case (a) is smaller than the incident angle θ b in case (b). Therefore, in the case of (a), a part of the light emitted from the light emitting diode, which is far from the central axis, is incident on the side of the light guide at an incident angle below the threshold. In the case of (b), since the side of the light guide is bulging, the angle of incidence of the light emitted from the light emitting diode to the side of the light guide is much larger than the central axis. Less than).

In the present invention, the light guide 20 has a concave surface 22 and a bulging barrel shape in order to transmit the light generated from the light emitting diodes 10 to the diffusion lens 30 with minimal loss. It has two features, and has a feature of opening a portion of the side of the support 23 in order to easily remove the heat generated in the light emitting diode (10).

In the present invention, the diffusion lens 30 plays a role similar to the filament in incandescent lamps. The diffusion lens 30 is located at the center of the lighting device, similar to the filament of the incandescent lamp. The diffusion lens 30 is made of the same material as the light guide 20, so that the integral lens and the light guide 20 can reduce the loss of light at the interface between the light diffusion lens 30 and the light guide 20. It is preferable at the point.

1, 3, and 4, the diffusion lens 30 may include a first surface 31 coupled to the light guide 20 and a second surface 32 spaced apart from the first surface 31. A concave diffuse reflection surface 33 is formed at the center of the second surface 32 of the diffusion lens 30. The other surface of the diffusing lens 30 or the surface of the light guide 20 is smoothly processed to cause total reflection, but the diffuse reflection surface 33 is roughly processed to cause diffuse reflection in all directions. . The cross section of the diffuse reflection surface 33 is a shape in which two curves are combined, like a wing of a seagull.

Light reaching the diffused lens 30 through the light guide 20 collides with the diffuse reflection surface 33 to cause diffuse reflection. In this case, the diffuse reflection surface 33 shines very brightly as shown in FIG. 7. That is, the diffuse reflection surface 33 functions similar to a heated filament in incandescent lamps.

Referring to FIG. 1, the reflecting plate 40 is disposed on the printed circuit board 1 and reflects the light toward the printed circuit board 1 among the light diffused and reflected on the diffuse reflection surface 33. The reflective plate 40 may be used by using a metal plate having a smooth surface, or by plating a surface of the metal plate.

Hereinafter, the operation of the lighting apparatus using the above-described light emitting diode will be described in detail.

When power is applied to the light emitting diode 10, the light emitting diode 10 irradiates light to the front surface. The irradiated light is collected in the direction of the central axis of the light emitting diode 10 by the concave surface 22 of the receiving portion 21 of the light guide 20 surrounding the light emitting diode 10, and then proceeds to the light guide 20. do. Light propagating inside the light guide 20 causes total reflection at the interface between the light guide 20 and the air. Since the light guide 20 is in the form of a barrel, the angle of incidence at the interface between the light guide 20 and the air increases, which makes it easier to cause total reflection. The totally reflected light passes through the light guide 20 again and passes through the first surface 31 of the diffusion lens 30. Since the light guide 20 and the diffusion lens 30 are integrally manufactured with the same material, the path of light is not changed or lost at the interface. Light passing through the first surface 31 of the diffusion lens 30 reaches the diffuse reflection surface 33 of the diffusion lens 30. The light reaching the diffuse reflection surface 33 diffuses in all directions, and the diffuse reflection surface 33 shines brightly like a filament of an incandescent lamp. Among the light reflected from the diffuse reflection surface 33, the light reflected toward the downward direction in which the light emitting diodes 10 are installed is reflected again by the reflecting plate 40.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention.

10 light emitting diode 20 light guide
21: accommodating part 22: concave surface
23: support portion 30: diffusion lens
33: diffuse reflection surface 40: reflector

Claims (7)

A light emitting diode mounted on a printed circuit board,
A barrel is formed in a bulging side surface, and an accommodating part accommodating the light emitting diode and a supporting part extending from the accommodating part toward the printed circuit board are formed at one end thereof, and an inner surface of the accommodating part facing the light emitting diode is concave. And a light guide for transmitting light generated by the light emitting diodes;
A diffusion lens having a first surface in contact with the light guide and a second surface spaced apart from the first surface, wherein the second surface has a concave diffuse reflection surface for diffusely reflecting light transmitted through the light guide;
And a light emitting diode. The method of claim 1,
The support unit is a lighting device using a light emitting diode, a part of its side is open so as to release the heat generated by the light emitting diode. The method of claim 1,
And a light emitting diode in which the light guide and the diffusion lens are integrated. The method of claim 1,
And a reflector disposed between the first surface of the diffusion lens and the printed circuit board to reflect light diffused from the lens. The method of claim 1,
The surface of the diffuse reflection surface of the diffusion lens is roughly processed to cause diffuse reflection, and the remaining surface is smoothly processed to cause total reflection illumination device using a light emitting diode. The method of claim 1,
And a first light emitting diode having a circular diameter greater than that of the light guide member. The method of claim 1,
The cross-section of the diffuse reflection surface is a lighting device using a light emitting diode, the shape of the two curves combined, like a seagull wing.
KR1020110065463A 2011-07-01 2011-07-01 Lighting apparatus using light emitting diode KR20130003853A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110065463A KR20130003853A (en) 2011-07-01 2011-07-01 Lighting apparatus using light emitting diode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110065463A KR20130003853A (en) 2011-07-01 2011-07-01 Lighting apparatus using light emitting diode

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KR20130003853A true KR20130003853A (en) 2013-01-09

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KR1020110065463A KR20130003853A (en) 2011-07-01 2011-07-01 Lighting apparatus using light emitting diode

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103307484A (en) * 2013-06-04 2013-09-18 周凯 LED lamp
KR200476231Y1 (en) * 2013-05-06 2015-02-11 주식회사 한라라이트 LED bulb reflector
US9010951B2 (en) 2013-07-05 2015-04-21 Lg Innotek Co., Ltd. Optical lens, light emitting device, and display
KR101691372B1 (en) * 2016-01-15 2016-12-30 주식회사 파인테크닉스 Multiple array light device
US9995461B2 (en) 2013-03-28 2018-06-12 Lg Innotek Co., Ltd. Optical lens, light emitting device, and lighting device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9995461B2 (en) 2013-03-28 2018-06-12 Lg Innotek Co., Ltd. Optical lens, light emitting device, and lighting device
KR200476231Y1 (en) * 2013-05-06 2015-02-11 주식회사 한라라이트 LED bulb reflector
CN103307484A (en) * 2013-06-04 2013-09-18 周凯 LED lamp
US9010951B2 (en) 2013-07-05 2015-04-21 Lg Innotek Co., Ltd. Optical lens, light emitting device, and display
KR101691372B1 (en) * 2016-01-15 2016-12-30 주식회사 파인테크닉스 Multiple array light device

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