WO2008153345A2 - Floodlighting apparatus - Google Patents

Floodlighting apparatus Download PDF

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Publication number
WO2008153345A2
WO2008153345A2 PCT/KR2008/003326 KR2008003326W WO2008153345A2 WO 2008153345 A2 WO2008153345 A2 WO 2008153345A2 KR 2008003326 W KR2008003326 W KR 2008003326W WO 2008153345 A2 WO2008153345 A2 WO 2008153345A2
Authority
WO
WIPO (PCT)
Prior art keywords
circuit board
printed circuit
leds
heat
floodlighting apparatus
Prior art date
Application number
PCT/KR2008/003326
Other languages
French (fr)
Other versions
WO2008153345A3 (en
Inventor
Myong-Woo Lee
Kwang-Keun Ham
Bok-Hyun Heo
Original Assignee
Medileds Co., Ltd
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.)
Filing date
Publication date
Application filed by Medileds Co., Ltd filed Critical Medileds Co., Ltd
Publication of WO2008153345A2 publication Critical patent/WO2008153345A2/en
Publication of WO2008153345A3 publication Critical patent/WO2008153345A3/en

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Classifications

    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/08—Lighting devices intended for fixed installation with a standard
    • F21S8/085—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light
    • F21S8/086—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light with lighting device attached sideways of the standard, e.g. for roads and highways
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/763—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/767—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having directions perpendicular to the light emitting axis
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • F21V29/89—Metals
    • 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
    • F21V5/04—Refractors for light sources of lens shape
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/14—Structural association of two or more printed circuits
    • H05K1/142—Arrangements of planar printed circuit boards in the same plane, e.g. auxiliary printed circuit insert mounted in a main printed circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting
    • F21W2131/101—Outdoor lighting of tunnels or the like, e.g. under bridges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting
    • F21W2131/103—Outdoor lighting of streets or roads
    • 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
    • F21Y2107/00—Light sources with three-dimensionally disposed light-generating elements
    • 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
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a floodlighting apparatus, and more particularly, to a floodlighting apparatus which can prevent heat generated from a plurality of light emitting diodes (LEDs) mounted on a printed circuit board of a metallic material, which is installed in a housing of the floodlighting apparatus, from being conducted to the printed circuit board and aluminum heat sinks to effectively prevent overheating of the LEDs, and can irradiate light of a desired brightness through a lens and a reflector in a state where dazzling is prevented.
  • LEDs light emitting diodes
  • a floodlighting apparatus is a kind of illuminating appliance that irradiates light of a desired brightness to a wide site to illuminate a specific zone.
  • Such a floodlighting apparatus is installed at various sports grounds, such as a ball park, a tennis court, a playground, and the like, and outskirts of buildings, and is also installed in the inside of buildings, tunnels, underground spaces of fields of construction work, internal sections of stations or harbors, or factories having high roofs.
  • a light emitting diode (LED) is usually used as a light source.
  • the LED is a photoelectric conversion semiconductor device having a semiconductor p-n junction structure.
  • the LED is a high-output light emitting device of a front emission or side emission type which emits red, green and blue light at wavelengths of 280 to 650nm, and which is packaged.
  • the LED creates minority carriers (electrons or positive holes) by using a p-n junction of a semiconductor, and emits light based on recombination of the carriers.
  • a semiconductor light emitting element is mainly classified into two groups, that is, a light emitting diode (LED) and a laser diode (LD). Since the LEED or LD generates light at wavelengths of narrow spectrum, the LED or LD has a high efficiency, as compared with the existing incandescent lamp that generates light at wavelengths of wide spectrum using blackbody radiation and then emits the light through a filter of a desired color.
  • the LED or LD can be driven by a power from 5OmW (at minimum) to 15W (at maximum), and improve a light emitting efficiency even through remarkably low power consumption.
  • the LED or LD has advantages that it is economical due to its semi-permanent lifespan and it can be positively employed for distance illumination, such as streetlamp or tunnel, using lens technology.
  • a conventional floodlighting apparatus includes, as shown in FIGs. 1a to 3, a pole 100, a plurality of LEDs 2 mounted on a printed circuit board 3 of metal at regular intervals which is installed in a housing 1 engaged to an upper end of the pole 100, a plurality of aluminum heat sinks 4 installed on a bottom portion of the printed circuit board 3 for dissipating the heat conducted from the LEDs 2 to the printed circuit board 3, and a lens 6 provided on the housing 1 in front of the LEDs 2 for condensing and irradiating the light generated from the LEDs 2.
  • the present invention has been made in view of the above- mentioned problems.
  • An object of the present invention is to provide a floodlighting apparatus which can remarkably extend a lifespan of LEDs and reduce a maintenance expense by preventing the heat generated from a plurality of LEDs mounted on a printed circuit board of a metallic material, which is installed in a housing of the floodlighting apparatus, from being conducted to the printed circuit board and aluminum heat sinks to effectively prevent overheating of the LEDs.
  • a flat reflector is adapted to reflect the light generated from the LEDs, and has a plurality of hexagonal reflective members formed on a surface of the reflector.
  • a convex reflector is adapted to reflect the light generated from the LEDs, and has a plurality of hexagonal reflective members formed on a surface of the reflector.
  • a concave reflector is adapted to reflect the light generated from the LEDs, and has a plurality of hexagonal reflective members formed on a surface of the reflector.
  • FIGs. 1a and 1b are side views illustrating conventional floodlighting apparatuses
  • FIG. 3 is a perspective view illustrating a state where the plurality of LEDs are mounted on the printed circuit board in FIG. 2;
  • FIG. 7 is a perspective view illustrating a state where a plurality of LEDs are mounted on a printed circuit board according to an embodiment of the present invention
  • FIGs. 8a to 8c are plan views illustrating reflectors according to the present invention
  • FIGs. 10a to 10c are cross-sectional views illustrating a housing mounted with a lens according to the present invention.
  • a reflector 70 formed in a flat, convex or concave shape is adapted to reflect the light generated from the LEDs 20, and is provided on a surface thereof with a plurality of hexagonal reflective members 72.
  • a plurality of through-holes 62 are formed in the lenses 60 formed in a flat, convex or concave shape.
  • the printed circuit board 30 is mounted inside the housing installed at the upper end of the support 100 of the floodlighting apparatus, and the plurality of LEDs 20 are packaged at equal distances on the upper portion of the printed circuit board 30 by welding, in which the printed circuit board is partitioned into unit bodies.
  • the plurality of aluminum heat sinks 40 are installed at equal distances on the bottom portion of the printed circuit board 30 composed of the unit bodies.
  • the insulating space parts 50 for heat dissipation are formed between the printed circuit board 30 composed of the unit bodies and the heat sink 40 provided on the bottom portion of the printed circuit board.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

A floodlighting apparatus is provided, which includes a printed circuit board of a metallic material mounted inside a housing installed at an upper end of a support, a plurality of light emitting diodes (LEDs) packaged at equal distances on an upper part of the printed circuit board, a plurality of heat sinks installed at equal distances on a lower end part of the printed circuit board, and a lens installed in the housing in front of the respective LEDs. The printed circuit board is partitioned into unit bodies, and insulating space parts for heat dissipation are formed between the printed circuit board composed of the unit bodies and the heat sinks to dissipate the heat being transmitted from LEDs to the printed circuit board and the heat sinks. An insulating material is inserted among the insulating space parts for heat dissipation.

Description

TITLE: FLOODLIGHTING APPARATUS
Technical Field
The present invention relates to a floodlighting apparatus, and more particularly, to a floodlighting apparatus which can prevent heat generated from a plurality of light emitting diodes (LEDs) mounted on a printed circuit board of a metallic material, which is installed in a housing of the floodlighting apparatus, from being conducted to the printed circuit board and aluminum heat sinks to effectively prevent overheating of the LEDs, and can irradiate light of a desired brightness through a lens and a reflector in a state where dazzling is prevented.
Background Art
A floodlighting apparatus is a kind of illuminating appliance that irradiates light of a desired brightness to a wide site to illuminate a specific zone. Such a floodlighting apparatus is installed at various sports grounds, such as a ball park, a tennis court, a playground, and the like, and outskirts of buildings, and is also installed in the inside of buildings, tunnels, underground spaces of fields of construction work, internal sections of stations or harbors, or factories having high roofs. A light emitting diode (LED) is usually used as a light source. The LED is a photoelectric conversion semiconductor device having a semiconductor p-n junction structure. The LED is a high-output light emitting device of a front emission or side emission type which emits red, green and blue light at wavelengths of 280 to 650nm, and which is packaged.
More specifically, the LED creates minority carriers (electrons or positive holes) by using a p-n junction of a semiconductor, and emits light based on recombination of the carriers. A semiconductor light emitting element is mainly classified into two groups, that is, a light emitting diode (LED) and a laser diode (LD). Since the LEED or LD generates light at wavelengths of narrow spectrum, the LED or LD has a high efficiency, as compared with the existing incandescent lamp that generates light at wavelengths of wide spectrum using blackbody radiation and then emits the light through a filter of a desired color. The LED or LD can be driven by a power from 5OmW (at minimum) to 15W (at maximum), and improve a light emitting efficiency even through remarkably low power consumption. In particular, the LED or LD has advantages that it is economical due to its semi-permanent lifespan and it can be positively employed for distance illumination, such as streetlamp or tunnel, using lens technology.
A conventional floodlighting apparatus includes, as shown in FIGs. 1a to 3, a pole 100, a plurality of LEDs 2 mounted on a printed circuit board 3 of metal at regular intervals which is installed in a housing 1 engaged to an upper end of the pole 100, a plurality of aluminum heat sinks 4 installed on a bottom portion of the printed circuit board 3 for dissipating the heat conducted from the LEDs 2 to the printed circuit board 3, and a lens 6 provided on the housing 1 in front of the LEDs 2 for condensing and irradiating the light generated from the LEDs 2.
Disclosure
Technical Problem
In the conventional floodlighting apparatus, temperature of the heat conducted from the LEDs 2 to the printed circuit board 3 and the aluminum heat sinks
4 should be less than the temperature range of 35 °C to 400C in order to maintain inherent lifespan of the LEDs 2. In actually, since the actual temperature is maintained in the range of 800C to 950C , a replacement cost of the LEDs 2 is increased. Therefore, there is a need for new technology to maintain the temperature of the heat conducted from the LEDs 2 to the printed circuit board 3 and the aluminum heat sinks 4 in the range of 35 °C to 400C . Also, when the floodlighting apparatus irradiates the light reflected by a reflector 7, it is difficult to effectively irradiate the light of a desired brightness due to a small reflection area. In addition, since the irradiation of the light using the lens 6 frequently brings about dazzling, there is also a need for an apparatus capable of irradiating the light of a desired brightness in a state where dazzling is prevented. Therefore, the present invention has been made in view of the above- mentioned problems.
An object of the present invention is to provide a floodlighting apparatus which can remarkably extend a lifespan of LEDs and reduce a maintenance expense by preventing the heat generated from a plurality of LEDs mounted on a printed circuit board of a metallic material, which is installed in a housing of the floodlighting apparatus, from being conducted to the printed circuit board and aluminum heat sinks to effectively prevent overheating of the LEDs.
Another object of the present invention is to provide a floodlighting apparatus which can irradiate light of a desired brightness using a lens and a reflector in a state where dazzling is prevented.
Technical Solution
In order to achieve the above and other objects, there is provided a floodlighting apparatus, according to the present invention, which includes a printed circuit board of a metallic material mounted inside a housing installed at an upper end of a support, a plurality of LEDs packaged at equal distances on an upper portion of the printed circuit board by soldering, a plurality of heat sinks installed at equal distances on a lower portion of the printed circuit board to dissipate heat being transmitted to the printed circuit board as the LEDs emit light, and a lens installed in the housing in front of the respective power LEDs to condense and irradiate the light emitted from the respective LEDs, wherein the printed circuit board is partitioned into unit bodies, insulating space parts for heat dissipation are formed between the printed circuit board composed of the unit bodies and the heat sink positioned under each unit body of the printed circuit board to dissipate the heat conducted from the LEDs to the printed circuit board and the heat sinks, and an insulating material is interposed between the insulating space parts for heat dissipation.
The insulating space parts for heat dissipation are extended from the upper portion of each unit body of the printed circuit board made of a metallic material to the lower portion of the heat sink. In one embodiment of the present invention, a flat reflector is adapted to reflect the light generated from the LEDs, and has a plurality of hexagonal reflective members formed on a surface of the reflector. A convex reflector is adapted to reflect the light generated from the LEDs, and has a plurality of hexagonal reflective members formed on a surface of the reflector. Otherwise, a concave reflector is adapted to reflect the light generated from the LEDs, and has a plurality of hexagonal reflective members formed on a surface of the reflector.
In one embodiment of the present invention, the lens is formed in a flat shape, and a plurality of through-holes are formed on a front surface of the lens. The lens is formed in a convex shape, and a plurality of through-holes are formed on a front surface of the lens. Otherwise, the lens is formed in a concave shape, and a plurality of through-holes are formed on a front surface of the lens.
Advantageous Effects
The floodlighting apparatus as constructed above can prevent heat generated from the LEDs mounted on the printed circuit board of a metallic material, which is installed in the housing, from being conducted to the printed circuit board and the aluminum heat sinks, thereby effectively preventing overheating of the LEDs and thus extending the lifespan of the LEDs.
Therefore, the floodlighting apparatus can reduce the maintenance expanse, and illuminate light of a desired brightness through the lens and the reflector, in a state where dazzling is prevented.
Brief Description of the Drawings
The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:
FIGs. 1a and 1b are side views illustrating conventional floodlighting apparatuses;
FIG. 2 is a plan view illustrating a state where which a plurality of LEDs are mounted on a printed circuit board which is installed in a housing of a conventional floodlighting apparatus;
FIG. 3 is a perspective view illustrating a state where the plurality of LEDs are mounted on the printed circuit board in FIG. 2;
FIG. 4a and 4b are side views illustrating floodlighting apparatuses according to embodiments of the present invention; FIG. 5 is a cross-sectional view illustrating a state where a plurality of LEDs are mounted on a printed circuit board which is installed in a housing of a floodlighting apparatus according to an embodiment of the present invention;
FIG. 6 is a plan view illustrating a state where a plurality of LEDs are mounted on a printed circuit board according to an embodiment of the present invention;
FIG. 7 is a perspective view illustrating a state where a plurality of LEDs are mounted on a printed circuit board according to an embodiment of the present invention; FIGs. 8a to 8c are plan views illustrating reflectors according to the present invention;
FIG. 9 is a front view of a lens according to the present invention; and
FIGs. 10a to 10c are cross-sectional views illustrating a housing mounted with a lens according to the present invention.
Best Mode
Reference will now be made in detail to the preferred embodiments of the present invention. It is to be understood that the following examples are illustrative only and the present invention is not limited thereto. FIG. 4a and 4b are side views illustrating floodlighting apparatuses according to embodiments of the present invention. FIG. 5 is a cross-sectional view illustrating a state where a plurality of LEDs are mounted on a printed circuit board which is installed in a housing of a floodlighting apparatus according to an embodiment of the present invention. FIG. 6 is a plan view illustrating a state where the plurality of LEDs are mounted on the printed circuit board according to an embodiment of the present invention. FIG. 7 is a perspective view illustrating a state where the plurality of LEDs are mounted on the printed circuit board according to an embodiment of the present invention. FIGs. 8a to 8c are plan views illustrating reflectors according to the present invention. FIG. 9 is a front view of a lens according to the present invention. And, FIGs. 10a to 10c are cross-sectional views illustrating the housing mounted with the lens according to the present invention.
The floodlighting apparatus of the present invention is adapted to effectively dissipate the heat generated from a plurality of LEDs and conducted to a printed circuit board of a metallic material and aluminum heat sinks. The floodlighting apparatus includes a printed circuit board 30 mounted inside a housing installed at an upper end of a support 100, and a plurality of LEDs 20 packaged at equal distances on an upper part of the printed circuit board 30 by welding, in which the printed circuit board is partitioned into unit bodies. A plurality of aluminum heat sinks 40 are installed at equal distances on a bottom portion of the printed circuit board 30 composed of the unit bodies.
Insulating space parts 50 for heat dissipation are formed between the printed circuit board 30 composed of the unit bodies and the heat sink 40 provided on the bottom portion of the printed circuit board to dissipate the heat conducted from the light emitting elements to the printed circuit board 30 and the heat sinks 40. The insulating space parts 50 are respectively extended from the upper portion of the printed circuit board 30 of metallic material composed of the unit bodies to the bottom surface of the aluminum heat sinks 40. Lenses 60 are installed on the housing 10 in front of the LEDs 20 to condense and irradiate the light generated from each LED 20.
A reflector 70 formed in a flat, convex or concave shape is adapted to reflect the light generated from the LEDs 20, and is provided on a surface thereof with a plurality of hexagonal reflective members 72. A plurality of through-holes 62 are formed in the lenses 60 formed in a flat, convex or concave shape.
As shown in FIGs. 4a to 10c, the printed circuit board 30 is mounted inside the housing installed at the upper end of the support 100 of the floodlighting apparatus, and the plurality of LEDs 20 are packaged at equal distances on the upper portion of the printed circuit board 30 by welding, in which the printed circuit board is partitioned into unit bodies. The plurality of aluminum heat sinks 40 are installed at equal distances on the bottom portion of the printed circuit board 30 composed of the unit bodies. The insulating space parts 50 for heat dissipation are formed between the printed circuit board 30 composed of the unit bodies and the heat sink 40 provided on the bottom portion of the printed circuit board.
The above-described construction can effectively prevent the heat generated from the LEDs 20 to the printed circuit board 30 made of a metallic material and the aluminum heat sinks 40 which are positioned adjacent to each other in unit bodies. Consequently, it is possible to prevent overheating of the LEDs 20, thereby remarkably extending the lifespan of the LEDs 20 and thus reduce its maintenance expenses.
The plurality of hexagonal reflective members 72 are formed on the surface of the reflector 70 that is formed in the flat, convex or concave shape to reflect the light generated from the LEDs 20. Therefore, when the light emitted from the LEDs 20 is reflected, a reflection area of the light is significantly increased to cause diffused reflection, which can improve intensity of illumination. In this instance, the LEDs 20 are arranged to be opposite to the reflector 70 to illuminate the light at a front center portion, as shown in FIGs. 8a to 8c. However, the LEDs 20 may be arranged in a front upper, front lower or front side direction with respect to the reflector 70, if necessary.
The plurality of through-holes 62 are formed in the lenses 60 formed in a flat, convex or concave shape, and are shaped in irregular shapes, so that the light of desired brightness is irradiated through the lens and the reflector in a state where dazzling of the light is prevented.
In an alternative embodiment, the insulating material (not shown) may be interposed between the insulating space parts 50 for heat dissipation to secure the effective heat dissipation. In addition, it will be noted that the insulating material prevents the construction itself from being damaged due to external shock. As an embodiment of the present invention, the floodlighting apparatus may be applied to various sites such as a tunnel, a field of construction work having high humidity or heat, and an exhibition hall that generates a lot of heat, for example, a clothing shop, by modifying the construction depending upon the required space.
Industrial Applicability
As can be seen from the foregoing, the floodlighting apparatus can prevent the heat generated from the LEDs mounted on the printed circuit board of a metallic material which is installed in the housing, from being conducted to the printed circuit board and the aluminum heat sinks, thereby effectively preventing overheating of the LEDs and thus extending the lifespan of the LEDs. Therefore, the floodlighting apparatus can reduce the maintenance expanse, and illuminate the light of desired brightness through the lens and the reflector in a state where dazzling is prevented. The floodlighting apparatus can be applied to various sites such as a tunnel, a field of construction work having high humidity or heat, and an exhibition hall that generates a lot of heat, for example, a clothing shop, through modification of the construction of the present invention depending upon the required space.
While this invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiment and the drawings. On the contrary, it is intended to cover various modifications and variations within the spirit and scope of the appended claims.

Claims

Claims
1. A floodlighting apparatus comprising a printed circuit board of a metallic material mounted inside a housing installed at an upper end of a support, a plurality of LEDs packaged at equal distances on an upper portion of the printed circuit board by soldering, a plurality of heat sinks installed at equal distances on a lower portion of the printed circuit board to dissipate heat being transmitted to the printed circuit board as the LEDs emit light, and a lens installed in the housing in front of the respective power LEDs to condense and irradiate the light emitted from the respective LEDs; wherein the printed circuit board 30 is partitioned into unit bodies, insulating space parts 50 for heat dissipation are formed between the printed circuit board 30 composed of the unit bodies and the heat sink 40 positioned under each unit body of the printed circuit board to dissipate the heat conducted from the LEDs to the printed circuit board 30 and the heat sinks 40, and an insulating material is interposed between the insulating space parts for heat dissipation.
2. The floodlighting apparatus of claim 1 , wherein the insulating space parts 50 for heat dissipation are extended from the upper portion of each unit body of the printed circuit board 30 made of a metallic material to the lower portion of the heat sink 40.
3. The floodlighting apparatus of claim 1 , further comprising a flat reflector 70 adapted to reflect the light generated from the LEDs 20, and having a plurality of hexagonal reflective members 72 formed on a surface thereof.
4. The floodlighting apparatus of claim 1 , further comprising a convex reflector 70 adapted to reflect the light generated from the LEDs 20, and having a plurality of hexagonal reflective members 72 formed on a surface thereof.
5. The floodlighting apparatus of claim 1 , further comprising a concave reflector 70 adapted to reflect the light generated from the LEDs 20, and having a plurality of hexagonal reflective members 72 formed on a surface thereof.
6. The floodlighting apparatus of claim 1 , wherein the lens 60 is formed in a flat shape, and a plurality of through-holes 62 are formed on a front surface thereof.
7. The floodlighting apparatus of claim 1 , wherein the lens 60 is formed in a convex shape, and a plurality of through-holes 62 are formed on a front surface thereof.
8. The floodlighting apparatus of claim 1 , wherein the lens 60 is formed in a concave shape, and a plurality of through-holes 62 are formed on a front surface thereof.
PCT/KR2008/003326 2007-06-14 2008-06-13 Floodlighting apparatus WO2008153345A2 (en)

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KR1020070058483A KR100827629B1 (en) 2007-06-14 2007-06-14 Floodlighting apparatus
KR10-2007-0058483 2007-06-14

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WO2008153345A3 WO2008153345A3 (en) 2009-02-26

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KR101034449B1 (en) * 2009-08-17 2011-05-17 엔 하이테크 주식회사 Heat-Sink for LED lighting unit
KR101199592B1 (en) 2010-12-23 2012-11-12 한국생산기술연구원 Heat radiation apparatus for led package and led package comprising the same

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JP2000010507A (en) * 1998-06-18 2000-01-14 Nippon Denyo Light emitting display device and its production
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JP3862723B2 (en) * 2002-10-25 2006-12-27 森山産業株式会社 Light emitting module
KR100715487B1 (en) * 2005-11-16 2007-05-08 주식회사 대림이엔지 Lighting lamp using led

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US5519596A (en) * 1995-05-16 1996-05-21 Hewlett-Packard Company Moldable nesting frame for light emitting diode array
JP2000010507A (en) * 1998-06-18 2000-01-14 Nippon Denyo Light emitting display device and its production
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KR100715487B1 (en) * 2005-11-16 2007-05-08 주식회사 대림이엔지 Lighting lamp using led

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KR100827629B1 (en) 2008-05-07

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