Light-emitting module and lamp using same

Patent metadata

Field	Value
Publication number	US-9423118-B2
Application number	US-201213980960-A
Country	US
Kind code	B2
Filing date	Nov 14, 2012
Priority date	Nov 15, 2011
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

A light-emitting module includes a substrate, an LED chip arranged on a main surface of the substrate, a sealing member covering the LED chip on the main surface of the substrate and converting a wavelength of the light produced by the LED chip, and a heat transfer member thermally connecting the sides of the LED chip to the main surface of the substrate and dissipating heat produced by the LED chip to the substrate. The heat transfer member is made up of a silicone resin having particles dispersed therein, the particles being nanoparticles of ZrO 2 and microparticles of MgO, which have higher thermal conductivity than the silicone resin.

First claim

The invention claimed is:

1. A light-emitting module, comprising:
a substrate;
at least one semiconductor light-emitting element arranged on a main surface of the substrate; and
a heat transfer member thermally connecting at least a portion of an outer circumferential surface of the semiconductor light-emitting element with the main surface of the substrate, and transferring heat produced by the semiconductor light-emitting element to the substrate, wherein
the heat transfer member includes a base material that is optically transmissive, and particles of an optically transmissive material that are dispersed within the base material and have higher thermal conductivity than the base material, wherein
the particles include first particles of a first type of optically transmissive material, and second particles of a second type of optically transmissive material,
an average diameter of the first particles is greater than a wavelength of red light,
an average diameter of the second particles is smaller than a wavelength of blue light, and
the first type of optically transmissive material has higher thermal conductivity than the second type of optically transmissive material.

2. The light-emitting module of claim 1 , wherein
the first type of optically transmissive material is equal in terms of refractive index to a compound material made up of the base material with only the second particles dispersed therein.

3. The light-emitting module of claim 1 , wherein
the first type of optically transmissive material is a first inorganic compound, and
the second type of optically transmissive material is a second inorganic compound that differs from the first inorganic compound.

4. The light-emitting module of claim 1 , wherein
the average diameter of the first particles is 1 μm to 100 μm.

5. The light-emitting module of claim 1 , wherein
the average diameter of the second particles is no more than 450 nm.

6. The light-emitting module of claim 1 , further comprising
a wavelength conversion member disposed on the main surface of the substrate so as to cover the semiconductor light-emitting element, converting a wavelength of light radiating from the semiconductor light-emitting element.

7. The light-emitting module of claim 1 , wherein
the semiconductor light-emitting element is affixed to the main surface of the substrate via an adhesive, and
the heat transfer member has lower thermal resistance than the adhesive.

8. The light-emitting module of claim 6 , wherein
the wavelength conversion member further covers the heat transfer member, and
the heat transfer member has greater thermal conductivity than the wavelength conversion member.

9. The light-emitting module of claim 1 , wherein
the semiconductor light-emitting element has a bottom face arranged to face the main surface of the substrate, and
the heat transfer member is arranged at an outer circumference of the semiconductor light-emitting element on the substrate, and is in contact with at least a portion of a side face of the semiconductor light-emitting element.

10. The light-emitting module of claim 9 , wherein
the heat transfer member further covers a top face of the semiconductor light-emitting element opposite the bottom face, and is in contact with at least a portion of the top face of the semiconductor light-emitting element.

11. The light-emitting module of claim 10 , wherein
the semiconductor light-emitting element is provided in plurality, and
the heat transfer member entirely covers the outer circumference of each semiconductor light-emitting element and the entire top face of all semiconductor light-emitting elements.

12. The light-emitting module of claim 10 , wherein
the semiconductor light-emitting element is arranged in plurality as a matrix on the main surface of the substrate, and
the heat transfer member covers the semiconductor light-emitting element in row units or in column units, thereby entirely covering the outer circumference of each semiconductor light-emitting element and the entire top face of all semiconductor light-emitting elements.

13. The light-emitting module of claim 9 , wherein
the semiconductor light-emitting element is arranged in plurality as a matrix on the main surface of the substrate, and
the heat transfer member is arranged so as to cover a band region on the main surface of the substrate, the band region extending in an alignment direction of the semiconductor light-emitting elements in two neighbouring rows or columns.

14. The light-emitting module of claim 9 , wherein
the semiconductor light-emitting element has an electrode on a top face thereof,
a wiring pattern is formed on the main surface of the substrate, and includes a land portion that is separate from the semiconductor light-emitting element,
the electrode and the land portion are electrically connected via a metal wire, and
the metal wire is at least partially arranged outside the heat transfer member.

15. The light-emitting module of claim 1 , wherein
the particles include nanoparticles having an average diameter of no more than 450 nm, and microparticles having an average diameter of 1 μm to 100 μm.

16. A lamp, comprising
the light-emitting module of claim 1 .

17. A lighting apparatus, comprising
the lamp of claim 16 .

18. A lamp, comprising:
a light-emitting module including:
a substrate;
a semiconductor light-emitting element arranged on a main surface of the substrate; and
a heat transfer member thermally connecting at least a portion of an outer circumferential surface of the semiconductor light-emitting element with the main surface of the substrate, and transferring heat produced by the semiconductor light-emitting element to the substrate;

a globe containing the light-emitting module therein; and
a wavelength conversion member arranged within the globe, converting a wavelength of light radiating from the semiconductor light-emitting element, wherein
the heat transfer member includes a base material that is optically transmissive, and particles of an optically transmissive material that are dispersed within the base material and have higher thermal conductivity than the base material, wherein
the particles include first particles of a first type of optically transmissive material, and second particles of a second type of optically transmissive material,
an average diameter of the first particles is greater than a wavelength of red light,
an average diameter of the second particles is smaller than a wavelength of blue light, and
the first type of optically transmissive material has higher thermal conductivity than the second type of optically transmissive material.

Assignees

• Panasonic Corp
• Panasonic Ip Man Co Ltd

Inventors

• Mori Toshio
• Aoki Ikuko
• Okano Kazuyuki
• Horiuchi Makoto
• Uemoto Takaari

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V3/12

  the coatings comprising photoluminescent substances · CPC title

• F21K9/64

  using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer · CPC title

• F21V23/002

  Arrangements of cables or conductors inside a lighting device, e.g. means for guiding along parts of the housing or in a pivoting arm · CPC title

• F21K9/232

  specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb · CPC title