Luminaire

• US 20140240955A1
• Filed: 09/13/2013
• Published: 08/28/2014
• Est. Priority Date: 02/26/2013
• Status: Abandoned Application

• Current Assignee: Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Inventors: Terasaki, Hikaru, Hisayasu, Takeshi, Shibahara, Yusuke, Kobayashi, Katsuyuki
• Application Number:
  US14/026,071
• Publication Number:
  US 20140240955A1
• Time in Patent Office: Days
• US Class Current: 362/84
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 13/14 the elements being filters or photoluminescent elements, reflectors and refractors
• CPC Class Codes: F21V 29/506 of globes, bowls or cover glasses
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 3/062 the material being plastics
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21Y 2105/16 square or rectangular, e.g. for light panels
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

According to one embodiment, a luminaire includes a main body section including a flat surface on one end side, a light-emitting module provided to be thermally joined to the flat surface and including a light-emitting element that emits light having a peak wavelength equal to or larger than 430 nm and equal to or smaller than 500 nm, a reflecting section provided on one end side of the main body section and configured to reflect the light emitted from the light-emitting element, a heat transfer section provided such that one end side thereof projects to the one end side of the main body section, the other end side of which being connected to the main body section, and a wavelength converting section provided spaced apart from the light-emitting element to cover the light-emitting module and to be thermally joined to the main body section and the heat transfer section.

Claims

1. A luminaire comprising:

a main body section including a flat surface on one end side;

a light-emitting module provided to be thermally joined to the flat surface of the main body section and including a light-emitting element that emits light having a peak wavelength equal to or larger than 430 nm and equal to or smaller than 500 nm;

a reflecting section provided on one end side of the main body section and configured to reflect the light emitted from the light-emitting element;

a heat transfer section provided such that one end side thereof projects to the one end side of the main body section, the other end side of which being connected to the main body section; and

a wavelength converting section provided spaced apart from the light-emitting element to cover the light-emitting module and to be thermally joined to the main body section and the heat transfer section.

2. The luminaire according to claim 1, wherein

the flat surface is provided to be orthogonal to a center axis of the luminaire, and

the reflecting section is a tabular body including at least one opening and is provided on the flat surface to expose the light-emitting element from the opening to the one end side of the main body section.

3. The luminaire according to claim 2, wherein the reflecting section is arranged on the flat surface and includes an inclined surface at an outer end portion, the inclined surface facing one end side.

4. The luminaire according to claim 2, wherein, when a dimension from a position of the center axis of the luminaire to an outer end portion on the one end side of the main body section is represented as R, a dimension from the flat surface of the main body section to a top of the luminaire is represented as L, a dimension from the position of the center axis of the luminaire to an outer end portion of the reflecting section is represented as r, and a dimension from the reflecting section to the top of the luminaire is represented as I, the following expression is satisfied:

r>

R·

I/L

5. The luminaire according to claim 4, wherein

the wavelength converting section includes, between the reflecting section and the top of the luminaire, a largest diameter section where a dimension from the position of the center axis of the luminaire to an inner surface of the wavelength converting section is larger than the dimension R, and

a dimension of a portion located on the outer end side of the reflecting section from the position of the center axis of the luminaire to the inner surface of the portion is larger than the dimension R and smaller than the largest diameter section.

6. The luminaire according to claim 2, wherein, when a dimension from a position of the center axis of the luminaire to an outer end portion on the one end side of the main body section is represented as R, a dimension from the flat surface of the main body section to a top of the luminaire is represented as L, a dimension from the position of the center axis of the luminaire to an outer end portion of the reflecting section is represented as r, and a dimension from the reflecting section to the top of the luminaire is represented as I, the following expression is satisfied:

r≦

R·

I/L

7. The luminaire according to claim 6, wherein

the wavelength converting section includes, between the reflecting section and the top of the luminaire, a largest diameter section where a dimension from the position of the center axis of the luminaire to an inner surface of the wavelength converting section is larger than the dimension R, and

a dimension of a portion located on the outer end side of the reflecting section from the position of the center axis of the luminaire to the inner surface of the portion is larger than the dimension R and smaller than the largest diameter section.

8. The luminaire according to claim 1, wherein the wavelength converting section is connected to a surface on the outer end side of the heat transfer section such that at least a part of the heat transfer section is in contact with outside air.

9. The luminaire according to claim 1, wherein

the heat transfer section includes:

a first tabular body provided such that the other end side is connected to an outer end portion of the main body section and the one end side projects toward a top of the luminaire; and

a second tabular body, the other end side of which is connected to the outer end portion of the main body section in a position different from the first tabular body and the one end side of which projects to the one end side of the main body section toward the top of the luminaire, the second tabular body being connected to the first tabular body near the top,

the wavelength converting section includes a first wavelength converting section and a second wavelength converting section, the first wavelength converting section is provided in a first region partitioned by the first tabular body and the second tabular body, and

the second wavelength converting section is provided in a second region partitioned by the first tabular body and the second tabular body.

10. The luminaire according to claim 1, wherein an end face of the heat transfer section is exposed from the wavelength converting section.

11. The luminaire according to claim 1, wherein the wavelength converting section includes a phosphor.

12. The luminaire according to claim 1, wherein the light-emitting module is held by the main body section and the reflecting section.

13. The luminaire according to claim 1, wherein, when an angle formed by the inclined surface of the reflecting section and an axis extending along a center axis of the luminaire is represented as α

and an angle formed by an outer end portion on the one end side of the main body section and the axis extending along the center axis of the luminaire is represented as β

, the following expression is satisfied;

α

≧

β

14. The luminaire according to claim 2, wherein a surface on one end side of the light-emitting element projects from a surface on one end side of the reflecting section in a direction of a top of the luminaire.

15. The luminaire according to claim 1, wherein the heat transfer section has reflectance higher than reflectance of the wavelength converting section.

16. The luminaire according to claim 1, wherein the heat transfer section assumes a tabular shape and includes an opening section that pierces through the heat transfer section in a thickness direction.

17. The luminaire according to claim 16, wherein the thickness dimension of the heat transfer section is equal to or larger than 0.5 mm and equal to or smaller than 5 mm.

18. The luminaire according to claim 1, wherein

a plurality of the light-emitting elements are provided, and

the plurality of light-emitting elements are arranged on a circumference of a circle centering on a position of a center axis of the luminaire.

19. The luminaire according to claim 1, further comprising a globe configured to cover the wavelength converting section.

20. The luminaire according to claim 1, further comprising a lens including a first concave section opened on the light-emitting element side and a second concave section opened on a side opposite to the light-emitting element side, the lens being provided between the light-emitting module and the wavelength converting section.