EP2317207B1 - Full angle led illumination device - Google Patents

Full angle led illumination device Download PDF

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Publication number
EP2317207B1
EP2317207B1 EP09174466A EP09174466A EP2317207B1 EP 2317207 B1 EP2317207 B1 EP 2317207B1 EP 09174466 A EP09174466 A EP 09174466A EP 09174466 A EP09174466 A EP 09174466A EP 2317207 B1 EP2317207 B1 EP 2317207B1
Authority
EP
European Patent Office
Prior art keywords
copper base
base plates
led
led chips
full angle
Prior art date
Legal status (The legal status 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 status listed.)
Not-in-force
Application number
EP09174466A
Other languages
German (de)
French (fr)
Other versions
EP2317207A1 (en
Inventor
Chia-Cheng Chang
Rong-Ming Chang
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Individual
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Individual
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Publication date
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Priority to AT09174466T priority Critical patent/ATE554337T1/en
Priority to EP09174466A priority patent/EP2317207B1/en
Publication of EP2317207A1 publication Critical patent/EP2317207A1/en
Application granted granted Critical
Publication of EP2317207B1 publication Critical patent/EP2317207B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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

Definitions

  • the present invention relates to a LED (light-emitting diode) illumination device and, more particularly, to a full angle LED illumination device capable of providing full angle illumination range and having improved thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips in use.
  • a plurality of LEDs are arranged on the same plane of a main body to form a conventional LED illumination device in order to provide wider illumination range and better illumination intensity.
  • LEDs light-emitting diodes
  • planar type LED illumination devices it is able to obtain 180-degree illumination range after the LEDs are driven.
  • the inventor had the motive to study and develop the present invention. After hard research and development, the inventor provides a full angle LED illumination device advantageous in providing full angle illumination range, having lower manufacturing cost, and having improved thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips in use.
  • An object of the present invention is to provide a full angle LED (light-emitting diode) illumination device, which is made by arranging plural copper base plates in a crisscross pattern to form the backbone of a three-dimensional globe and providing LED chips on the external surface of the three-dimensional globe at sites where any two copper base plates are crisscrossed.
  • LED chips are able to illuminate in different angle ranges in order to eliminate dead angles and achieve three-dimensional illumination effect.
  • Another object of the present invention is to provide a full angle LED illumination device, where each copper base plate is electroplated with a layer of silver thereon. Thereby, thermal conductivity and heat dissipation capability can be improved in order to prolong the lifetime of the LED chips in use while to keep the manufacturing cost low.
  • the present invention provides a full angle LED illumination device comprising at least three copper base plates, a plurality of LED chips, and a flexible circuit layer.
  • the copper base plates are arranged in a crisscross pattern to form the backbone of a three-dimensional globe and each copper base plate is electroplated with a layer of silver thereon.
  • Each LED chip is provided on the external surface of the three-dimensional globe at a site where any two copper base plates are crisscrossed.
  • the flexible circuit layer is provided on the peripheries of the copper base plates and electrically connected with the LED chips for controlling the LED chips. Accordingly, it is able to provide full angle illumination range and to improve the thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips in use effectively.
  • the full angle LED illumination device preferably includes three copper base plates and six LED chips.
  • the copper base plates are arranged to be vertical to each other to form the backbone of a three-dimensional globe while the LED chips are provided on the external surface of the three-dimensional globe at sites where any two copper base plates are crisscrossed.
  • Fig. 1 shows a perspective view of a full angle LED illumination device of the present invention.
  • Fig. 2 shows a top view of the full angle LED illumination device of the present invention.
  • the present invention discloses a full angle LED (light-emitting diode) illumination device comprising at least three copper base plates, a plurality of LED chips, and a flexible circuit layer.
  • the copper base plates are arranged in a crisscross pattern to form the backbone of a three-dimensional globe.
  • Each LED chip is provided on the external surface of the three-dimensional globe at a site where any two copper base plates are crisscrossed.
  • the flexible circuit layer is provided on the peripheries of the copper base plates and electrically connected with the LED chips for controlling the LED chips.
  • the full angle LED illumination device comprises three copper base plates 10, 12, 14, six LED chips 20, six covers 40, and a flexible circuit layer 30.
  • the copper base plates 10, 12, 14 are arranged to be vertical to each other to form the backbone of a three-dimensional globe. Above copper base plates can be assembled by means of using any method. Besides. Each copper base plate 10, 12, 14 is electroplated with a layer of silver thereon in order to obtain optimal thermal conductivity and heat dissipation capability.
  • copper and silver are used as the material to solve the problem regarding thermal conductivity and heat dissipation.
  • the thermal conductivity coefficient of copper is 380W/m.K while the thermal conductivity coefficient of silver is 429W/m.K. Accordingly, silver has better thermal conductivity when compared with copper. However, copper is much cheaper than silver.
  • the copper is used as a core for thermal conductivity and heat dissipation and silver is electroplated on the surface of the core made of copper.
  • copper and silver are used to form an alloy whose thermal conductivity is between those of copper and silver. Accordingly, better thermal conductivity and hear dissipation capability can be achieved while the cost can be kept low.
  • the thermal conductivity coefficient of the copper base plate electroplated with a layer of silver is about 420W/m.K. That is, the thermal conductivity of the copper base plate electroplated with a layer of silver is almost the same with that of silver while the cost of the electroplated copper base plate is much cheaper than that of silver. Besides, in addition to the better thermal conductivity and hear dissipation capability, the silver electroplated on the copper base plate is also able to provide reflection effect that is beneficial to increase effective luminous flux.
  • Each LED chip 20 is provided on the external surface of the three-dimensional globe at a site where any two copper base plates are crisscrossed and is covered with a cover 40. Thereby, the LED chips are able to illuminate in different angle ranges. Consequently, it is able to obtain full angle illumination range and eliminate dead angles effectively.
  • the flexible circuit layer 30 is provided on the peripheries of the copper base plates 10, 12, 14 and electrically connected with the LED chips 20 for controlling and operating the LED chips 20.
  • the present invention has following advantages:
  • the present invention can provide a full angle LED illumination device capable of providing full angle illumination range and advantageous in having improved the thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips in use while keeping the manufacturing cost low. It is new and can be put into industrial use.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Led Device Packages (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)

Abstract

A full angle LED (light-emitting diode) illumination device comprises at least three copper base plates, a plurality of LED chips, and a flexible circuit layer. Each copper base plate is electroplated with a layer of silver thereon and the copper base plates are arranged in a crisscross pattern to form the backbone of a three-dimensional globe. Each LED chip is provided on the external surface of the three-dimensional globe at a site where any two copper base plates are crisscrossed. The flexible circuit layer is provided on the peripheries of the copper base plates and electrically connected with the LED chips for controlling the LED chips. Accordingly, it is able to provide full angle illumination range and to improve the thermal conductivity and heat dissipation capability in order to prolong effectively the lifetime of the LED chips in use.

Description

    Technical Field
  • The present invention relates to a LED (light-emitting diode) illumination device and, more particularly, to a full angle LED illumination device capable of providing full angle illumination range and having improved thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips in use.
    • Background
  • Typically, a plurality of LEDs (light-emitting diodes) are arranged on the same plane of a main body to form a conventional LED illumination device in order to provide wider illumination range and better illumination intensity. By using above planar type LED illumination devices, it is able to obtain 180-degree illumination range after the LEDs are driven.
  • Although 180-degree illumination range can be achieved by means of above LED arrangement, the practical illumination effect provided by above LED illumination devices is not ideal. In order to widen the illumination range, two planar type LED illumination devices are combined to form a new device, the illumination of which is almost 360 degree.
  • However, it is also disadvantageous in several aspects to combine two planar type LED illumination devices mentioned hereinabove.
  • First of all, dead angles still exist even two planar type LED illumination devices are combined and it is unable to achieve 360-degree illumination range. Second, the assembling cost for combining two planar type LED illumination devices is greatly increased. Besides, assembling two planar type LED illumination devices not only requires highly complicated and difficult technical skills but also takes much longer time. Moreover, the yield of the devices produced by assembling two planar type LED illumination devices is low as well. DE 203 142984 describes a LED device comprising circuit boards which intersect and carry LEDs on their edges.
  • In order to overcome above shortcomings, inventor had the motive to study and develop the present invention. After hard research and development, the inventor provides a full angle LED illumination device advantageous in providing full angle illumination range, having lower manufacturing cost, and having improved thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips in use.
    • Summary of the disclosure
  • An object of the present invention is to provide a full angle LED (light-emitting diode) illumination device, which is made by arranging plural copper base plates in a crisscross pattern to form the backbone of a three-dimensional globe and providing LED chips on the external surface of the three-dimensional globe at sites where any two copper base plates are crisscrossed. Thereby, LED chips are able to illuminate in different angle ranges in order to eliminate dead angles and achieve three-dimensional illumination effect.
  • Another object of the present invention is to provide a full angle LED illumination device, where each copper base plate is electroplated with a layer of silver thereon. Thereby, thermal conductivity and heat dissipation capability can be improved in order to prolong the lifetime of the LED chips in use while to keep the manufacturing cost low.
  • In order to achieve above objects, the present invention provides a full angle LED illumination device comprising at least three copper base plates, a plurality of LED chips, and a flexible circuit layer. The copper base plates are arranged in a crisscross pattern to form the backbone of a three-dimensional globe and each copper base plate is electroplated with a layer of silver thereon. Each LED chip is provided on the external surface of the three-dimensional globe at a site where any two copper base plates are crisscrossed. The flexible circuit layer is provided on the peripheries of the copper base plates and electrically connected with the LED chips for controlling the LED chips. Accordingly, it is able to provide full angle illumination range and to improve the thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips in use effectively.
  • In practice, the full angle LED illumination device preferably includes three copper base plates and six LED chips. The copper base plates are arranged to be vertical to each other to form the backbone of a three-dimensional globe while the LED chips are provided on the external surface of the three-dimensional globe at sites where any two copper base plates are crisscrossed.
  • The following detailed description, given by way of examples or embodiments, will best be understood in conjunction with the accompanying drawings.
    • Brief Description of the Drawings
  • Fig. 1 shows a perspective view of a full angle LED illumination device of the present invention.
  • Fig. 2 shows a top view of the full angle LED illumination device of the present invention.
    • Detailed Description
  • The present invention discloses a full angle LED (light-emitting diode) illumination device comprising at least three copper base plates, a plurality of LED chips, and a flexible circuit layer. The copper base plates are arranged in a crisscross pattern to form the backbone of a three-dimensional globe. Each LED chip is provided on the external surface of the three-dimensional globe at a site where any two copper base plates are crisscrossed. The flexible circuit layer is provided on the peripheries of the copper base plates and electrically connected with the LED chips for controlling the LED chips.
  • Please refer to Figs. 1 and 2 showing a preferred embodiment of the full angle LED illumination device of the present invention. In this embodiment, the full angle LED illumination device comprises three copper base plates 10, 12, 14, six LED chips 20, six covers 40, and a flexible circuit layer 30.
  • The copper base plates 10, 12, 14 are arranged to be vertical to each other to form the backbone of a three-dimensional globe. Above copper base plates can be assembled by means of using any method. Besides. Each copper base plate 10, 12, 14 is electroplated with a layer of silver thereon in order to obtain optimal thermal conductivity and heat dissipation capability.
  • Heat will be inevitably produced when LED chips are used. If the produced heat is unable to dissipate effectively, the temperature of the LED chips will be elevated accordingly, which may shorten the lifetime of the LED chips. In order to solve this problem and prolong the lifetime of LED chips, metal is typically used to dissipate produced heat because of good thermal conductivity and heat dissipation capability.
  • In this embodiment, copper and silver are used as the material to solve the problem regarding thermal conductivity and heat dissipation. The thermal conductivity coefficient of copper is 380W/m.K while the thermal conductivity coefficient of silver is 429W/m.K. Accordingly, silver has better thermal conductivity when compared with copper. However, copper is much cheaper than silver.
  • Therefore, in the present invention, the copper is used as a core for thermal conductivity and heat dissipation and silver is electroplated on the surface of the core made of copper. In other words, copper and silver are used to form an alloy whose thermal conductivity is between those of copper and silver. Accordingly, better thermal conductivity and hear dissipation capability can be achieved while the cost can be kept low.
  • In practice, the thermal conductivity coefficient of the copper base plate electroplated with a layer of silver is about 420W/m.K. That is, the thermal conductivity of the copper base plate electroplated with a layer of silver is almost the same with that of silver while the cost of the electroplated copper base plate is much cheaper than that of silver. Besides, in addition to the better thermal conductivity and hear dissipation capability, the silver electroplated on the copper base plate is also able to provide reflection effect that is beneficial to increase effective luminous flux.
  • Each LED chip 20 is provided on the external surface of the three-dimensional globe at a site where any two copper base plates are crisscrossed and is covered with a cover 40. Thereby, the LED chips are able to illuminate in different angle ranges. Consequently, it is able to obtain full angle illumination range and eliminate dead angles effectively.
  • In this embodiment, the flexible circuit layer 30 is provided on the peripheries of the copper base plates 10, 12, 14 and electrically connected with the LED chips 20 for controlling and operating the LED chips 20.
  • Therefore, the present invention has following advantages:
    1. 1. By arranging at least three copper base plates in a crisscross pattern to form the backbone of a three-dimensional globe and disposing each LED chip on the external surface of the three-dimensional globe at a site where any two copper base plates are crisscrossed, it is able to obtain full angle illumination range and effectively eliminate dead angles.
    2. 2. The alloy formed by electroplating a layer of silver on the surface of a copper base plate has ideal thermal conductivity and heat dissipation capability and low manufacturing cost.
    3. 3. By electroplating a layer of silver on the surface of a copper base plate, the electroplated silver can provide better reflection effect in order to increase the effective luminous flux.
  • As disclosed in the above description and attached drawings, the present invention can provide a full angle LED illumination device capable of providing full angle illumination range and advantageous in having improved the thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips in use while keeping the manufacturing cost low. It is new and can be put into industrial use.
  • Although the embodiments of the present invention have been described in detail, many modifications and variations may be made by those skilled in the art from the teachings disclosed hereinabove.

Claims (4)

  1. A full angle LED (light-emitting diode) illumination device, comprising:
    at least three copper base plates (10, 12, 14), where each copper base plate is electroplated with a layer of silver thereon, and the copper base plates (10, 12, 14) are arranged in a crisscross pattern to form the backbone of a three-dimensional globe;
    a plurality of LED chips (20), each of which is provided on the external surface of the three-dimensional globe at a site where any two copper base plates are crisscrossed; and
    a flexible circuit layer (30), provided on the peripheries of the copper base plates (10, 12, 14) and electrically connected with the LED chips (20) for controlling the LED chips (20).
  2. The full angle LED illumination device as claimed in claim 1, wherein each LED chip (20) is further covered by a cover.
  3. The full angle LED illumination device as claimed in claim 1, comprising three copper base plates (10, 12, 14) and six LED chips (20), wherein the copper base plates (10, 12, 14) are arranged to be vertical to each other to form the backbone of a three-dimensional globe; the LED chips (20) are provided on the external surface of the three-dimensional globe at sites where any two copper base plates are crisscrossed.
  4. The full angle LED illumination device as claimed in claim 3, wherein each LED chip (20) is further covered by a cover (40).
EP09174466A 2009-10-29 2009-10-29 Full angle led illumination device Not-in-force EP2317207B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT09174466T ATE554337T1 (en) 2009-10-29 2009-10-29 360 DEGREE LED LIGHTING DEVICE
EP09174466A EP2317207B1 (en) 2009-10-29 2009-10-29 Full angle led illumination device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09174466A EP2317207B1 (en) 2009-10-29 2009-10-29 Full angle led illumination device

Publications (2)

Publication Number Publication Date
EP2317207A1 EP2317207A1 (en) 2011-05-04
EP2317207B1 true EP2317207B1 (en) 2012-04-18

Family

ID=41716378

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09174466A Not-in-force EP2317207B1 (en) 2009-10-29 2009-10-29 Full angle led illumination device

Country Status (2)

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EP (1) EP2317207B1 (en)
AT (1) ATE554337T1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20300806U1 (en) * 2003-01-20 2004-05-27 Warnking Elektrotechnik Gmbh Powerful LED lamp with at least two circuit boards, carrying numerous LEDs secured to lamp cap, with second circuit board mounted in spaced manner from first circuit board surface fitted with LEDs
DE20314298U1 (en) * 2003-09-12 2003-11-20 Para Light Electronics Co., Ltd., Chung Ho, Taipeh LED assembly has several circuit boards each with several mountings for LEDs, each circuit board being mounted on baseboard with electric connections
US7726836B2 (en) * 2007-11-23 2010-06-01 Taiming Chen Light bulb with light emitting elements for use in conventional incandescent light bulb sockets

Also Published As

Publication number Publication date
ATE554337T1 (en) 2012-05-15
EP2317207A1 (en) 2011-05-04

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