WO2009116705A1 - Illuminating apparatus using light emitting diode - Google Patents

Illuminating apparatus using light emitting diode Download PDF

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Publication number
WO2009116705A1
WO2009116705A1 PCT/KR2008/003456 KR2008003456W WO2009116705A1 WO 2009116705 A1 WO2009116705 A1 WO 2009116705A1 KR 2008003456 W KR2008003456 W KR 2008003456W WO 2009116705 A1 WO2009116705 A1 WO 2009116705A1
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WO
WIPO (PCT)
Prior art keywords
light source
illuminating apparatus
source units
inclined surfaces
light
Prior art date
Application number
PCT/KR2008/003456
Other languages
French (fr)
Inventor
Jai-Won Kim
Dong-Hyun Yu
Dong-Kun Lim
Original Assignee
Luxpia 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 Luxpia Co., Ltd. filed Critical Luxpia Co., Ltd.
Publication of WO2009116705A1 publication Critical patent/WO2009116705A1/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
    • 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
    • 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
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/69—Details of refractors forming part of the light source
    • 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
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • 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
    • F21Y2107/40—Light sources with three-dimensionally disposed light-generating elements on the sides of polyhedrons, e.g. cubes or pyramids
    • 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]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/72—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps in street lighting

Definitions

  • the present invention relates to an illuminating apparatus using a light emitting diodes (LEDs), and more particularly, to a streetlight that improves luminous uniformity over an entire surface on which the streetlight shines by adjusting the intensity and amount of light emitted by light source units of the streetlight according to the positions of the light source units.
  • LEDs light emitting diodes
  • LEDs which are semiconductor light sources formed of a compound semiconductor, such as GaAs, AlGaN, or AlGaAs, and emitting light in a variety of colors, are getting lots of attention as light sources for illuminating apparatuses in various fields because of their advantages of long life, low energy consumption, and environment-friendly performance.
  • Streetlights or security lights are illuminating apparatuses installed on roads and footway for traffic safety.
  • streetlights or security lights use a metal halide lamp, a natrium lamp, or a mercury lamp as a light source.
  • metal halide lamps, natrium lamps, or mercury lamps have the disadvantages of high energy consumption, low brightness, and short lifetime such that the amount of light drastically decreases as time passes.
  • mercury gas causes environmental pollution when discarded after use.
  • LEDs can overcome the aforementioned disadvantages thanks to their high efficiency and environment-friendly performance. However, it is difficult to apply LEDs to streetlights or security lights since a spot directly under an LED is much brighter than surroundings around the spot directly under the LED due to the straightness of light emitted from the LED. Disclosure of Invention Technical Problem
  • the present invention provides an illuminating apparatus using a light emitting diode
  • LED whose luminous intensity distribution characteristics can be improved such that luminous intensity over an entire surface on which the illuminating apparatus, e.g., a streetlight, shines can be uniform
  • an illuminating apparatus comprising: a body part having a plurality of inclined surfaces inclined at different inclination angles to a reference surface; a plurality of light source mounting boards respectively disposed on the plurality of inclined surfaces; and a plurality of light source units coupled to the light source mounting boards and emitting light, and each comprising a light emitting diode (LED) chip, wherein the number of the light source units is determined so that luminous intensity at a surface parallel to the reference surface is uniform.
  • LED light emitting diode
  • the number of the plurality of light source units may vary depending on the inclination angles of the inclined surfaces on which the plurality of light source units are located.
  • Each of the inclination angles of the inclined surfaces may range from 5 ° to 70 ° .
  • Each of the radiation angles of light beams emitted by the light source units may be less than 120 ° .
  • the light source mounting boards may be bonded to the inclined surfaces by using thermal tapes.
  • Each of the light source units may comprise: a base: an LED chip disposed on the base; and a filling member surrounding the LED chip to protect the LED chip, wherein the material and shape of the filling member are determined so that the filling member can act as a lens.
  • Each of the light source units may comprise: a base; an LED chip disposed on the base; and a filling member surrounding the LED chip to protect the LED chip; and a condenser lens facing the filling member.
  • the illuminating apparatus Since the illuminating apparatus according to the present invention uses an LED, the illuminating apparatus has the economic advantages of long lifetime, low energy consumption, and environment-friendly performance.
  • FIG. 1 is a perspective view of an illuminating apparatus according to an embodiment of the present invention.
  • FIG. 2 is a plan view illustrating a body part of the illuminating apparatus of FIG. 1 ;
  • FIG. 3 is a cross-sectional view illustrating one of a plurality of light source units employed by the illuminating apparatus of FIG. 1 ;
  • FIG. 4 is a cross-sectional view illustrating a modification of the light source unit of
  • FIG. 3 employed by the illuminating apparatus of FIG. 1 ;
  • FIG. 5 is a perspective view illustrating one of light source mounting boards employed by the illuminating apparatus of FIG. 1 ;
  • FIG. 6 is a schematic view illustrating the luminous intensity distribution pattern of a conventional streetlight using no light emitting diode (LED);
  • FIG. 7 is a schematic view illustrating the luminous intensity distribution pattern of the illuminating apparatus of FIG. 1 ;
  • FIG. 8 is a schematic view illustrating the luminous intensity distribution pattern of a conventional streetlight using an LED.
  • FIG. 1 is a perspective view of an illuminating apparatus 100 according to an embodiment of the present invention.
  • FIG. 2 is a plan view illustrating a body part 120 of the illuminating apparatus 1 of FIG. 1.
  • the illuminating apparatus 100 includes the body part 120 having a plurality of inclined surfaces, a plurality of light source mounting boards 130 respectively disposed on the plurality of inclined surfaces, and a plurality of light source units 140 coupled to the light source mounting boards 130 and emitting light.
  • the plurality of inclined surfaces of the body part 120 are inclined at different inclination angles to a reference surface S.
  • the body part 120 may have a cylindrical shape or a polygonal prism shape.
  • the number of the inclined surfaces is not limited and may be determined in various ways as long as a luminous intensity distribution pattern can be adjusted.
  • the number of the inclined surfaces having different inclination angles may be greater than 3.
  • inclined surfaces 120a, 120band 120c are respectively inclined at angles a, band c to the reference surface S, and satisfy a relationship a ⁇ b ⁇ c.
  • Each of the inclination angles a, band c of the inclined surfaces 120a, 120band 120c may range from 5 ° to 70 ° .
  • the light source mounting boards 130 are respectively disposed on the plurality of inclined surfaces , and the plurality of light source units 140 for emitting light are coupled to the light source mounting boards 130.
  • the number of the light source units 140 located on each of the inclined surfaces is determined so that luminous intensity at a surface parallel to the reference surface S is uniform.
  • the number of the light source units 140 may vary depending on the inclination angle of each of the inclined surfaces on which the light source units 140 are located. For example, the larger the inclination angles of the inclination surfaces on which the light source units 140 are located, the larger the number of light source units 140 becomes. In FIGS.
  • the inclination angles a, b and c of the inclination surfaces 120a, 120b and 120c satisfy the relationship a ⁇ b ⁇ c
  • the numbers Na, Nb and Nc of the light source units 140 located on the inclined surfaces 120a, 120b and 120c satisfy a relationship Na ⁇ Nb ⁇ Nc.
  • each of the radiation angles of beams emitted by the light source units 140 may be less than 120 ° .
  • each of the light source units 140 employed by the illuminating apparatus 100 may include a lens unit.
  • FIG. 3 is a cross-sectional view illustrating one of the light source units 140 employed by the illuminating apparatus 100 of FIG. 1.
  • the light source unit 140 includes a light emitting diode (LED) chip 144 and a lens unit collecting light emitted by the LED chip 144.
  • the light source unit 140 may include a base 142, the LED chip 144 disposed on the base 142, and a filling member 146 surrounding the LED chip 144 to protect the LED chip 144 and acting as a lens unit.
  • the material and shape of the filling member 146 are determined so that the filling member 146 can act as a lens unit.
  • the filling member 156 may be formed of a transparent material having a refractive index of greater than 1 such as epoxy resin, polymethyl- metacrylate (PMMA), polycarbonate (PC), acrylic resin, or silicon resin.
  • a transparent material having a refractive index of greater than 1 such as epoxy resin, polymethyl- metacrylate (PMMA), polycarbonate (PC), acrylic resin, or silicon resin.
  • PMMA polymethyl- metacrylate
  • PC polycarbonate
  • acrylic resin acrylic resin
  • silicon resin silicon resin
  • the filling member 146 has a spherical shape in FIG. 3, the present invention is not limited thereto and the filling member 156 may have any shape to have an adequate radiation angle characteristics.
  • FIG. 4 is a cross-sectional view illustrating a modification of the light source unit 140 of FIG. 3 employed by the illuminating apparatus 100 of FIG. 1.
  • a light source unit 140' includes an LED chip 144, and a lens unit collecting light emitted by the LED chip 144.
  • the light source unit 140' may include a base 142, the LED chip 144 disposed on the base 142, a filling member 147 surrounding the LED chip 144 to protect the LED chip 144, and a condenser lens 149 facing the filling member 147.
  • the filling member 147 may be formed of a silicon or epoxy material.
  • the condenser lens 149 is not limited to the shape shown in FIG. 4, and may have any shape to have an adequate radiation angle characteristics.
  • the radiation angle of a conventional light source unit including no lens unit is approximately 120 ° , thereby failing to obtain a luminous intensity distribution pattern similar to that of a conventional streetlight.
  • FIG. 5 a perspective view illustrating one of the light source mounting boards 130 employed by the illuminating apparatus of FIG. 1.
  • the light source mounting board 130 is designed so that the illuminating apparatus 100, e.g., a streetlight, can be easily maintained and repaired electrically and mechanically.
  • the light source mounting board 130 includes a connector 135, which electrically connects between two light source mounting boards 130 or between one light source mounting board 130 and a circuit unit, so that the illuminating apparatus 100 can be installed, maintained, and repaired.
  • the light source mounting board 130 is coupled to its corresponding inclined surface of the body part 120 using a screw 137, so that the illuminating apparatus 100 can be easily maintained and repaired.
  • the light source mounting board 108 is connected to its corresponding inclined surface by using a thermal tape 133, so as to remove a fine air gap between the light source mounting board 108 and the inclined surface, increase thermal conductivity, and maximize heat dissipation effect.
  • FIG. 6 is a schematic view illustrating the luminous intensity distribution pattern of a conventional streetlight using no LED.
  • FIG. 7 is a schematic view illustrating the luminous intensity distribution pattern of the illuminating apparatus 100 of FIG. 1.
  • FIG. 8 is a schematic view illustrating the luminous intensity distribution pattern of a conventional streetlight using an LED.
  • the luminous intensity distribution pattern of the illuminating apparatus 100 of FIG. 1 illustrated in FIG. 7 is similar to that of the con- ventional streetlight using no LED illustrated in FIG. 6.
  • the luminous intensity distribution pattern of the illuminating apparatus 100 of FIG. 1 illustrated in FIG. 7 is quite different from that of the conventional streetlight using the LED illustrated in FIG. 8.
  • the LED is disposed on a plane surface, and thus light is concentrated on a spot directly under the conventional streetlight using the LED.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Led Device Packages (AREA)

Abstract

Provided is an illuminating apparatus using a light emitting diode (LED). The illuminating apparatus includes: a body part having a plurality of inclined surfaces inclined at different inclination angles to a reference surface; a plurality of light source mounting boards respectively disposed on the plurality of inclined surfaces; and a plurality of light source units coupled to the light source mounting boards and emitting light, and each comprising a light emitting diode (LED) chip, wherein the number of the light source units is determined so that luminous intensity at a surface parallel to the reference surface is uniform.

Description

Description ILLUMINATING APPARATUS USING LIGHT EMITTING
DIODE
Technical Field
[1] The present invention relates to an illuminating apparatus using a light emitting diodes (LEDs), and more particularly, to a streetlight that improves luminous uniformity over an entire surface on which the streetlight shines by adjusting the intensity and amount of light emitted by light source units of the streetlight according to the positions of the light source units. Background Art
[2] Light emitting diodes (LEDs), which are semiconductor light sources formed of a compound semiconductor, such as GaAs, AlGaN, or AlGaAs, and emitting light in a variety of colors, are getting lots of attention as light sources for illuminating apparatuses in various fields because of their advantages of long life, low energy consumption, and environment-friendly performance.
[3] Recently, illuminating apparatuses using LEDs have been developed, and attempts to apply LEDs to streetlights or security lights have been made.
[4] Streetlights or security lights are illuminating apparatuses installed on roads and footway for traffic safety. In general, streetlights or security lights use a metal halide lamp, a natrium lamp, or a mercury lamp as a light source. However, metal halide lamps, natrium lamps, or mercury lamps have the disadvantages of high energy consumption, low brightness, and short lifetime such that the amount of light drastically decreases as time passes. In particular, mercury gas causes environmental pollution when discarded after use.
[5] LEDs can overcome the aforementioned disadvantages thanks to their high efficiency and environment-friendly performance. However, it is difficult to apply LEDs to streetlights or security lights since a spot directly under an LED is much brighter than surroundings around the spot directly under the LED due to the straightness of light emitted from the LED. Disclosure of Invention Technical Problem
[6] In case of streetlights using conventional lamps as light sources , design of reflectors is an important factor in determining the luminous intensity distribution. However, since the light emitted from LEDs travels straight in one direction, reflectors for LEDs are meaningless. Accordingly, there are demands for developing structures or arrangements that can act as reflectors for dispersing light emitted by LEDs to have the luminous intensity distribution characteristics suitable as streetlights. Technical Solution
[7] The present invention provides an illuminating apparatus using a light emitting diode
(LED) whose luminous intensity distribution characteristics can be improved such that luminous intensity over an entire surface on which the illuminating apparatus, e.g., a streetlight, shines can be uniform
[8] According to an aspect of the present invention, there is provided an illuminating apparatus comprising: a body part having a plurality of inclined surfaces inclined at different inclination angles to a reference surface; a plurality of light source mounting boards respectively disposed on the plurality of inclined surfaces; and a plurality of light source units coupled to the light source mounting boards and emitting light, and each comprising a light emitting diode (LED) chip, wherein the number of the light source units is determined so that luminous intensity at a surface parallel to the reference surface is uniform.
[9] The number of the plurality of light source units may vary depending on the inclination angles of the inclined surfaces on which the plurality of light source units are located.
[10] The larger inclination angles of the inclined surfaces, the larger number of light source units located on the inclined surfaces.
[11] Each of the inclination angles of the inclined surfaces may range from 5 ° to 70 ° .
[12] Each of the radiation angles of light beams emitted by the light source units may be less than 120 ° .
[13] The light source mounting boards may be bonded to the inclined surfaces by using thermal tapes.
[14] Each of the light source units may comprise: a base: an LED chip disposed on the base; and a filling member surrounding the LED chip to protect the LED chip, wherein the material and shape of the filling member are determined so that the filling member can act as a lens.
[15] Each of the light source units may comprise: a base; an LED chip disposed on the base; and a filling member surrounding the LED chip to protect the LED chip; and a condenser lens facing the filling member. Advantageous Effects
[16] Since the illuminating apparatus according to the present invention uses an LED, the illuminating apparatus has the economic advantages of long lifetime, low energy consumption, and environment-friendly performance.
[17] Furthermore, since the intensity and amount of light are adjusted depending on where light of the illuminating apparatus is directed to, luminous intensity over an entire surface on which the illuminating apparatus shines can be uniform.
[18] Moreover, since the plurality of light source mounting boards are separately installed according to inclination angles, the light sources can be partially repaired, thereby leading to easy maintenance and repair. Description of Drawings
[19] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:
[20] FIG. 1 is a perspective view of an illuminating apparatus according to an embodiment of the present invention;
[21] FIG. 2 is a plan view illustrating a body part of the illuminating apparatus of FIG. 1 ;
[22] FIG. 3 is a cross-sectional view illustrating one of a plurality of light source units employed by the illuminating apparatus of FIG. 1 ;
[23] FIG. 4 is a cross-sectional view illustrating a modification of the light source unit of
FIG. 3 employed by the illuminating apparatus of FIG. 1 ;
[24] FIG. 5 is a perspective view illustrating one of light source mounting boards employed by the illuminating apparatus of FIG. 1 ;
[25] FIG. 6 is a schematic view illustrating the luminous intensity distribution pattern of a conventional streetlight using no light emitting diode (LED);
[26] FIG. 7 is a schematic view illustrating the luminous intensity distribution pattern of the illuminating apparatus of FIG. 1 ; and
[27] FIG. 8 is a schematic view illustrating the luminous intensity distribution pattern of a conventional streetlight using an LED. Mode for Invention
[28] The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. In the drawings, the same reference numeral denotes the same element, and the sizes of components may be exaggerated for clarity.
[29] FIG. 1 is a perspective view of an illuminating apparatus 100 according to an embodiment of the present invention. FIG. 2 is a plan view illustrating a body part 120 of the illuminating apparatus 1 of FIG. 1.
[30] Referring to FIGS. 1 and 2, the illuminating apparatus 100 includes the body part 120 having a plurality of inclined surfaces, a plurality of light source mounting boards 130 respectively disposed on the plurality of inclined surfaces, and a plurality of light source units 140 coupled to the light source mounting boards 130 and emitting light.
[31] The plurality of inclined surfaces of the body part 120 are inclined at different inclination angles to a reference surface S. For example, the body part 120 may have a cylindrical shape or a polygonal prism shape. The number of the inclined surfaces is not limited and may be determined in various ways as long as a luminous intensity distribution pattern can be adjusted. The number of the inclined surfaces having different inclination angles may be greater than 3. In FIGS. 1 and 2, for example, inclined surfaces 120a, 120band 120c are respectively inclined at angles a, band c to the reference surface S, and satisfy a relationship a<b<c. Each of the inclination angles a, band c of the inclined surfaces 120a, 120band 120c may range from 5 ° to 70 ° .
[32] The light source mounting boards 130 are respectively disposed on the plurality of inclined surfaces , and the plurality of light source units 140 for emitting light are coupled to the light source mounting boards 130.
[33] The number of the light source units 140 located on each of the inclined surfaces is determined so that luminous intensity at a surface parallel to the reference surface S is uniform. To this end, the number of the light source units 140 may vary depending on the inclination angle of each of the inclined surfaces on which the light source units 140 are located. For example, the larger the inclination angles of the inclination surfaces on which the light source units 140 are located, the larger the number of light source units 140 becomes. In FIGS. 1 and 2, the inclination angles a, b and c of the inclination surfaces 120a, 120b and 120c satisfy the relationship a<b<c, and the numbers Na, Nb and Nc of the light source units 140 located on the inclined surfaces 120a, 120b and 120c satisfy a relationship Na<Nb<Nc.
[34] If the illuminating apparatus 100 constructed as described above is used as a streetlight, luminous intensity over an entire surface on which the streetlight shines can be uniform. That is, since the amount of light directed toward a portion of ground directly under the streetlight is less than the amount of light directed otherwise, luminous intensity over the entire ground surface on which the streetlight shines can be uniform. When the amount of light is adjusted depending on where light from the streetlight is directed to, each of the radiation angles of beams emitted by the light source units 140 may be less than 120 ° . To this end, each of the light source units 140 employed by the illuminating apparatus 100 may include a lens unit.
[35] FIG. 3 is a cross-sectional view illustrating one of the light source units 140 employed by the illuminating apparatus 100 of FIG. 1. The light source unit 140 includes a light emitting diode (LED) chip 144 and a lens unit collecting light emitted by the LED chip 144. For example, the light source unit 140 may include a base 142, the LED chip 144 disposed on the base 142, and a filling member 146 surrounding the LED chip 144 to protect the LED chip 144 and acting as a lens unit. The material and shape of the filling member 146 are determined so that the filling member 146 can act as a lens unit. For example, the filling member 156 may be formed of a transparent material having a refractive index of greater than 1 such as epoxy resin, polymethyl- metacrylate (PMMA), polycarbonate (PC), acrylic resin, or silicon resin. Although the filling member 146 has a spherical shape in FIG. 3, the present invention is not limited thereto and the filling member 156 may have any shape to have an adequate radiation angle characteristics.
[36] FIG. 4 is a cross-sectional view illustrating a modification of the light source unit 140 of FIG. 3 employed by the illuminating apparatus 100 of FIG. 1. A light source unit 140' includes an LED chip 144, and a lens unit collecting light emitted by the LED chip 144. For example, the light source unit 140' may include a base 142, the LED chip 144 disposed on the base 142, a filling member 147 surrounding the LED chip 144 to protect the LED chip 144, and a condenser lens 149 facing the filling member 147. The filling member 147 may be formed of a silicon or epoxy material. The condenser lens 149 is not limited to the shape shown in FIG. 4, and may have any shape to have an adequate radiation angle characteristics.
[37] The radiation angle of a conventional light source unit including no lens unit, unlike any of the light source units 140 and 140', is approximately 120 ° , thereby failing to obtain a luminous intensity distribution pattern similar to that of a conventional streetlight.
[38] FIG. 5 a perspective view illustrating one of the light source mounting boards 130 employed by the illuminating apparatus of FIG. 1. The light source mounting board 130 is designed so that the illuminating apparatus 100, e.g., a streetlight, can be easily maintained and repaired electrically and mechanically. The light source mounting board 130 includes a connector 135, which electrically connects between two light source mounting boards 130 or between one light source mounting board 130 and a circuit unit, so that the illuminating apparatus 100 can be installed, maintained, and repaired. Mechanically, the light source mounting board 130 is coupled to its corresponding inclined surface of the body part 120 using a screw 137, so that the illuminating apparatus 100 can be easily maintained and repaired. In addition, the light source mounting board 108 is connected to its corresponding inclined surface by using a thermal tape 133, so as to remove a fine air gap between the light source mounting board 108 and the inclined surface, increase thermal conductivity, and maximize heat dissipation effect.
[39] FIG. 6 is a schematic view illustrating the luminous intensity distribution pattern of a conventional streetlight using no LED. FIG. 7 is a schematic view illustrating the luminous intensity distribution pattern of the illuminating apparatus 100 of FIG. 1. FIG. 8 is a schematic view illustrating the luminous intensity distribution pattern of a conventional streetlight using an LED.
[40] Referring to FIGS. 6 through 8, the luminous intensity distribution pattern of the illuminating apparatus 100 of FIG. 1 illustrated in FIG. 7 is similar to that of the con- ventional streetlight using no LED illustrated in FIG. 6. The luminous intensity distribution pattern of the illuminating apparatus 100 of FIG. 1 illustrated in FIG. 7 is quite different from that of the conventional streetlight using the LED illustrated in FIG. 8. Referring to FIG. 8, the LED is disposed on a plane surface, and thus light is concentrated on a spot directly under the conventional streetlight using the LED. [41] As described above, since the illuminating apparatus according to the present invention uses an LED, the illuminating apparatus has the economic advantages of long lifetime, low energy consumption, and environment-friendly performance.

Claims

Claims
[1] An illuminating apparatus comprising: a body part having a plurality of inclined surfaces inclined at different inclination angles to a reference surface; a plurality of light source mounting boards respectively disposed on the plurality of inclined surfaces; and a plurality of light source units coupled to the light source mounting boards and emitting light, and each comprising a light emitting diode (LED) chip, wherein the number of the light source units is determined so that luminous intensity at a surface parallel to the reference surface is uniform. [2] The illuminating apparatus of claim 1, wherein the number of the plurality of light source units varies depending on the inclination angle of each of the inclined surfaces on which the plurality of light source units are located. [3] The illuminating apparatus of claim 2, wherein the larger inclination angles of the inclined surfaces, the larger number of light source units located on the inclined surfaces. [4] The illuminating apparatus of claim 1, wherein each of the inclination angles of the inclined surfaces ranges from 5 ° to 70 ° . [5] The illuminating apparatus of claim 1, wherein each of the radiation angles of light beams emitted by the light source units is less than 120 ° . [6] The illuminating apparatus of claim 1, wherein the light source mounting boards are bonded to the inclined surfaces by using thermal tapes. [7] The illuminating apparatus of claim 1, wherein each of the light source units comprises: a base: an LED chip disposed on the base; and a filling member surrounding the LED chip to protect the LED chip, wherein the material and shape of the filling member are determined so that the filling member can act as a lens. [8] The illuminating apparatus of claim 1, wherein each of the light source units comprises: a base; an LED chip disposed on the base; and a filling member surrounding the LED chip to protect the LED chip; and a condenser lens facing the filling member.
PCT/KR2008/003456 2008-03-19 2008-06-18 Illuminating apparatus using light emitting diode WO2009116705A1 (en)

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