EP2574835A1 - Élément de guidage de la lumière et ampoule dotée de celui-ci - Google Patents

Élément de guidage de la lumière et ampoule dotée de celui-ci Download PDF

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Publication number
EP2574835A1
EP2574835A1 EP11183261A EP11183261A EP2574835A1 EP 2574835 A1 EP2574835 A1 EP 2574835A1 EP 11183261 A EP11183261 A EP 11183261A EP 11183261 A EP11183261 A EP 11183261A EP 2574835 A1 EP2574835 A1 EP 2574835A1
Authority
EP
European Patent Office
Prior art keywords
light
guiding member
bulb
led module
heat
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.)
Withdrawn
Application number
EP11183261A
Other languages
German (de)
English (en)
Inventor
Shih-Feng Peng
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitronics Taiwan Co Ltd
Original Assignee
Sumitronics Taiwan 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 Sumitronics Taiwan Co Ltd filed Critical Sumitronics Taiwan Co Ltd
Priority to EP11183261A priority Critical patent/EP2574835A1/fr
Publication of EP2574835A1 publication Critical patent/EP2574835A1/fr
Withdrawn legal-status Critical Current

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
    • 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
    • F21K9/61—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using light guides
    • 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
    • F21V29/87—Organic material, e.g. filled polymer composites; Thermo-conductive additives or coatings therefor
    • 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
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/02—Globes; Bowls; Cover glasses characterised by the shape
    • 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 instant disclosure relates to a light-guiding member and a light bulb having the same; more particularly, to a light-guiding member and light bulb having the same, where the light-emitting diode (LED) is used as the light source.
  • LED light-emitting diode
  • LEDs have many advantages such as being more energy efficient, have longer service life, and being brighter, among others. Because of these attributes, LEDs have been adopted progressively for widespread use with lighting devices, such as LED light bulbs.
  • LED light source such as LED dies
  • LED dies is rather uni-directional and can only project light through a specific light output surface (usually the top surface of a die), thus lighting up only a limited amount of space.
  • This behavior may significantly reduce the brightness, particularly in the lateral direction such as near the conducting cap portion of the light bulb.
  • one of the existing techniques involves using a light-guiding structure to assist with re-distributing the light projections.
  • Such technique may result in uneven light distribution and cause visual issues for users. Tremendous efforts have been inputted by industrial manufacturers to develop a light bulb capable of providing a wider light projection and uniform brightness.
  • the inventor strives via industrial experience and academic research to present the instant disclosure, which can effectively improve the limitations described above.
  • the instant disclosure provides a light-guiding member and a light bulb having the same.
  • the light bulb can achieve a wider light projection and uniform brightness.
  • the light bulb comprises a connecting cap, a heat-dissipating seat, a LED module, a light-guiding member, and a bulb.
  • the heat-dissipating seat is arranged on one end of the connecting cap, and the LED module is disposed on the heat-dissipating seat.
  • the light-guiding member is connected to the heat-dissipating seat and covers the LED module. At least one microstructure is formed on the surface of the light-guiding member to change the light projection path.
  • the bulb is disposed over the light-guiding member.
  • the instant disclosure also provides a light-guiding member used with a LED module.
  • the distinctive feature of the light-guiding member is the inclusion of at least one microstructure formed on the surface thereof for changing the light projection path.
  • the light-guiding member has a rounded base portion, which is arranged above the LED module.
  • the light projection path of the LED module can be adjusted to provide wider light projection and uniform brightness.
  • Fig. 1 is a schematic view of a light bulb for a first embodiment of the instant disclosure.
  • Fig. 2 is an exploded view of the light bulb for the first embodiment of the instant disclosure.
  • Fig. 3A is a schematic view of a light-guiding member having a plurality of microstructures for the first embodiment of the instant disclosure.
  • Fig. 3B is a schematic view of a plain light-guiding member without microstructures for the first embodiment of the instant disclosure.
  • Fig. 4 is a sectional view of the light-guiding member for a second embodiment of the instant disclosure.
  • Fig. 5 is a sectional view of the light-guiding member for a third embodiment of the instant disclosure.
  • the light bulb comprises a connecting cap 1, a heat-dissipating seat 2, a LED module 3, a light-guiding member 4, a bulb 5, and a power-supply module 6.
  • the connecting cap 1 is arranged on one end (bottom end) of the heat-dissipating seat 2, and the light-guiding member 4 is connected to the other end (top end) thereof.
  • an E27 style threaded cap is used.
  • the LED module 3 is disposed on the heat-dissipating seat 2 and covered by the light-guiding member 4.
  • the bulb 5 is arranged over the light-guiding member 4, and the power-supply module 6 is received within the light bulb.
  • Fig. 2 shows the connecting cap 1 having a mounting portion 11 and an assembling portion 12.
  • the outer appearance and function of the connecting cap 1 are not the main focus of the instant disclosure, therefore no further elaboration is given hereinafter.
  • the power-supply module 6 Being arranged inside of the connecting cap 1, the power-supply module 6 is connected electrically to the LED module 3 and the interior surface of the mounting portion 11, to establish electrical connection with the external power source, e.g., power outlet.
  • the heat-dissipating seat 2 is arranged on the assembling portion 12 of the connecting cap 1.
  • the heat-dissipating seat 2 is made from thermally conductive material such as aluminum metal, alumina, aluminum nitride, or plastic.
  • the material choice is not restricted.
  • the heat-dissipating seat 2 can have a hollow or solid body.
  • the heat-dissipating member 2 has an aluminum hollow body, to enhance the heat dissipation efficiency of the light bulb.
  • a nano-coating can be applied to the exterior surface of the heat-dissipating seat 2 in forming a thermal radiation layer thereon (not labeled). Thereby, heat can be dissipated by means of thermal radiation to the ambient to increase the heat dissipation rate.
  • the LED module 3 includes at least one LED. When multiple LEDs are available, the LEDs can be grouped in a particular array. Likewise, based on applications, the LED module 3 can be produced in a variety of types. For example, the LED module 3 can include surface mount LED or cylindrical packaged LED.
  • the light-guiding member 4 is arranged on the heat-dissipating seat 2.
  • the light-guiding member 4 has a light-guiding portion 41, a rounded base portion 42, and a top portion 43.
  • the base portion 42 is arranged adjacently to one end of the heat-dissipating seat 2, whereas the top portion 43 is arranged away from the heat-dissipating seat 2.
  • the light-guiding member 4 can be sized according to the type of the LED module 3.
  • the base portion 42 is arched and arranged over the LED module 3. Without restriction, the base portion 42 can be arched in such a way to work cooperatively with the LED module 3, to achieve a wider light projection angle or desired projection angle of the user.
  • the top portion 43 can be produced in a variety of shapes based on needs without restriction, such as being circular, rectangular, or rhombus-like shaped, among others.
  • the bulb 5 has a main body 51 and a narrowed mating portion 52 extending therefrom.
  • the main body 51 is spherically shaped and hollowed; however, the main body 51 is not restricted structurally.
  • the mating portion 52 of the bulb 5 is mounted to the assembling portion 12 of the connecting cap 1.
  • the bulb 5 can be a glass bulb that is transparent or frosted in allowing light to project therethrough. Thereby, light emitted by the LED module 3 can be directed by the light-guiding member 4 and pass through the bulb 5 to project outwardly.
  • Fig. 3A shows the light-guiding member 4.
  • At least one microstructure 411 is formed on the light-guiding portion 41 and at least one microstructure 421 is formed on the base 42, where the microstructures 411 and 421 serve to change the light projection path.
  • at least one microstructure (not shown) can also be formed on the top potion 43, but is not restricted thereto.
  • a mold can first be made to take the shape of the microstructures, and followed by using injection molding or roll forming technique to produce the light-guiding member 4 with preferred microstructures thereon.
  • the manufacturing method of the light-guiding member 4 is not restricted.
  • microstructures 411 and 421 are formed on the light-guiding portion 41 and the base portion 42, respectively.
  • Each of the microstructures 411 and 421 are formed concavedly on the surface of the light-guiding member 4 and arranged in a continuous fashion.
  • the purpose of the microstructures 411 and 421 is to change the light projection angle and direction for better lighting effect.
  • the actual shape of each of the microstructures 411 and 421 is not restricted, which may be hemispherical, semi-elliptical, or having multiple continuously connected surfaces.
  • Fig. 3B shows the light paths projecting from the light-guiding member 4 without any microstructure formed thereon. As shown in Fig.
  • the presence of the microstructures 411 and 421 alter the projecting directions of the light emitted from the LED module 3.
  • the alteration enables the light bulb to illuminate a wider area by increasing the brightness in the rearward and lateral directions.
  • the microstructures 411 and 421 can diffuse the light in allowing the light to project uniformly from the bulb 5.
  • Fig. 4 shows the light-guiding member 4 for a second embodiment of the instant disclosure.
  • the same numerals have been used in Fig. 4 to indicate identical components between the embodiments.
  • the second embodiment differs from the previous embodiment by: each of the microstructures 411 and 421 are formed protrudingly on the surface of the light-guiding member 4.
  • the light bulb of the instant disclosure can be equipped with the light-guiding member 4 having protruding microstructures formed thereon.
  • Fig. 5 shows the light-guiding member 4 for a third embodiment of the instant disclosure.
  • the same numerals have been used in Fig. 5 to indicate identical components between the embodiments.
  • the third embodiment differs from the first embodiment by: the microstructures 411 and 421 are arranged in isolated groups on the surface of the light-guiding member 4. The distance between each group of microstructures can be adjusted according to needs without restrictions. Thus, the microstructures 411 and 421 can be arranged arbitrarily on the light-guiding member 4.
  • the light bulb of the instant disclosure utilizes the microstructures 411 and 421 to adjust the projection paths of light emitted from the LED module 3.
  • the light bulb can illuminate a wider area, such as by improving brightness in the lateral direction in providing more uniform brightness.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP11183261A 2011-09-29 2011-09-29 Élément de guidage de la lumière et ampoule dotée de celui-ci Withdrawn EP2574835A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11183261A EP2574835A1 (fr) 2011-09-29 2011-09-29 Élément de guidage de la lumière et ampoule dotée de celui-ci

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11183261A EP2574835A1 (fr) 2011-09-29 2011-09-29 Élément de guidage de la lumière et ampoule dotée de celui-ci

Publications (1)

Publication Number Publication Date
EP2574835A1 true EP2574835A1 (fr) 2013-04-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP11183261A Withdrawn EP2574835A1 (fr) 2011-09-29 2011-09-29 Élément de guidage de la lumière et ampoule dotée de celui-ci

Country Status (1)

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EP (1) EP2574835A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3561367A1 (fr) * 2018-04-23 2019-10-30 Xiamen Eco Lighting Co., Ltd. Appareil de lumière avec motif éclairé

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1429395A2 (fr) * 2002-12-09 2004-06-16 Osram Sylvania Inc. Source de lumière imitant une lampe à incandescence
WO2009069894A2 (fr) * 2007-11-27 2009-06-04 Gwang Sung Lighting Industry Co., Ltd. Lampe de type à ampoule dotée de diodes électroluminescentes fonctionnant avec du courant alternatif
US20100148650A1 (en) * 2008-12-17 2010-06-17 Ping-Ju Wu Structure of light bulb
WO2010079439A1 (fr) * 2009-01-09 2010-07-15 Koninklijke Philips Electronics N.V. Élément optique avec diode électroluminescente, et source de lumière le comprenant
WO2010110652A1 (fr) * 2009-03-23 2010-09-30 Eldolab Holding B.V. Lampe à del comprenant un guide de lumière comportant des première et seconde surfaces diffusantes
WO2010113113A1 (fr) * 2009-04-02 2010-10-07 Koninklijke Philips Electronics N.V. Dispositif électroluminescent et luminaire

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1429395A2 (fr) * 2002-12-09 2004-06-16 Osram Sylvania Inc. Source de lumière imitant une lampe à incandescence
WO2009069894A2 (fr) * 2007-11-27 2009-06-04 Gwang Sung Lighting Industry Co., Ltd. Lampe de type à ampoule dotée de diodes électroluminescentes fonctionnant avec du courant alternatif
US20100148650A1 (en) * 2008-12-17 2010-06-17 Ping-Ju Wu Structure of light bulb
WO2010079439A1 (fr) * 2009-01-09 2010-07-15 Koninklijke Philips Electronics N.V. Élément optique avec diode électroluminescente, et source de lumière le comprenant
WO2010110652A1 (fr) * 2009-03-23 2010-09-30 Eldolab Holding B.V. Lampe à del comprenant un guide de lumière comportant des première et seconde surfaces diffusantes
WO2010113113A1 (fr) * 2009-04-02 2010-10-07 Koninklijke Philips Electronics N.V. Dispositif électroluminescent et luminaire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3561367A1 (fr) * 2018-04-23 2019-10-30 Xiamen Eco Lighting Co., Ltd. Appareil de lumière avec motif éclairé

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