Lighting apparatus with heat transfer and light guiding structure

Patent metadata

Field	Value
Publication number	US-9371967-B2
Application number	US-201213597558-A
Country	US
Kind code	B2
Filing date	Aug 29, 2012
Priority date	Feb 27, 2012
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

A lighting apparatus, comprising: a light source that emits light; a hollow heat-transfer member including an outer surface on which the light source is disposed; and a light guiding member that covers the light source and at least part of the outer surface along the outer surface.

First claim

What is claimed is:

1. A lighting apparatus, comprising:
at least one light source that emits light;
a heat-transfer member including an outer surface on which the at least one light source is disposed, the heat-transfer member forming a hollow space;
a light guiding member that contacts along the outer surface of the heat-transfer member and covers the at least one light source and at least part of the outer surface of the heat-transfer member; and
a reflection member that is provided in contact with an outer surface of the light guiding member and to be opposed to the at least one light source via the light guiding member, wherein
the at least one light source is provided at an end of the heat-transfer member in a direction of a center axis of the lighting apparatus substantially and is interposed between the heat-transfer member and the light guiding member,
part of the light emitted by the at least one light source is reflected totally at an interface between the light guiding member and an outside and inside of the light guiding member and propagates to an interior of the light guiding member, and both the heat-transfer member and the light guiding member surround the hollow space,
part of an outer surface of the light guiding member facing the at least one light source having another curved surface which is different from a curve of the peripheral part of the outer surface of the light guiding member and which reflects light emitted from the at least one light source toward an extending direction of the light guiding member,
the reflecting member having another curved surface which faces the at least one light source and reflects light emitted from the at least one light source toward an extending direction of the light guiding member, and
the curved surface of the light guiding member and the other curved surface of the reflecting member contact along the extending direction of the light guiding member with each other.

2. The lighting apparatus according to claim 1 , wherein the light guiding member is fixed to the outer surface of the heat-transfer member adhesively.

3. The lighting apparatus according to claim 1 , further comprising
a cylinder-shaped cap that is provided to part of the heat-transfer member, wherein
the at least one light source is located on a center axis of the cylinder-shaped cap and the heat-transfer member.

4. The lighting apparatus according to claim 1 , further comprising
a cylinder-shaped cap that is provided to part of the heat-transfer member, wherein
the heat-transfer member is rotatable with respect to the cylinder-shaped cap about a center axis of the cylinder-shaped cap and the heat-transfer member.

5. The lighting apparatus according to claim 1 , further comprising
a through-hole that passes through the heat-transfer member and the light guiding member.

6. The lighting apparatus according to claim 1 , wherein
the reflection member transmits there through part of light emitted by the at least one light source, to an outside of the lighting apparatus.

7. The lighting apparatus according to claim 1 , wherein
the light guiding member guides light emitted by the at least one light source along the outer surface of the heat-transfer member and radiates the light to an outside of the lighting apparatus.

8. The lighting apparatus according to claim 1 , wherein
the heat-transfer member includes a spherical head portion and a first circular truncated cone shaped body portion, wherein
the spherical head portion and the first body portion being integrally formed, and wherein the light guiding member includes a spherical head portion and a second circular truncated cone shaped body portion.

9. The lighting apparatus according to claim 8 , wherein
the first circular truncated cone shaped body portion includes an opening at one end on a center axis direction of a cylinder-shaped cap and the heat-transfer member.

10. The lighting apparatus according to claim 1 , wherein the light guiding member includes a scattering mark on a surface of the light guiding member for scattering light.

11. The lighting apparatus according to claim 1 , wherein the at least one light source is provided at an end of the heat-transfer member in a direction of gravitational force between the heat-transfer member and the light source.

12. The lighting apparatus according to claim 1 , wherein the at least one light source is disposed at an end of the lighting apparatus on a center axis direction of a cylinder-shaped cap and the heat-transfer member, so that the light from the at least one light source is symmetrically guided inside the light guiding member so that the light is symmetric about the at least one light source.

13. The lighting apparatus according to claim 1 , further comprising,
a first member that reflects into the light guiding member a part of light, which is inputted from the at least one light source into the light guiding member, and that transmits a part of light to an external space of the lighting apparatus.

14. The lighting apparatus according to claim 13 , wherein the first member is a beam splitter.

15. The lighting apparatus according to claim 1 , further comprising
the at least one light source is provided on a center axis of a cylinder-shaped cap, and the reflection member is provided at least on the center axis.

16. The lighting apparatus according to claim 1 , further comprising
one or more first through-holes proximate a cap portion of the lighting apparatus, the one or more first through-holes passing through the heat-transfer member and the light guiding member; and
one or more second through-holes spaced apart from any one of the one or more first through-holes, the one or more second through-holes passing through the heat-transfer member and the light guiding member.

17. The lighting apparatus according to claim 1 , further comprising a cylinder-shaped cap provided at part of the heat-transfer member, wherein the light guiding member is formed to extend to the cylinder-shaped cap substantially.

18. The lighting apparatus according to claim 1 , further comprising a cylinder-shaped cap provided at part of the heat-transfer member, wherein the heat-transfer member is formed to extend to the cylinder-shaped cap substantially.

19. The lighting apparatus according to claim 1 , further comprising a cylinder-shaped cap provided at part of the heat-transfer member, wherein the heat-transfer member is formed to extend along an inner surface of the light guiding member to the cylinder-shaped cap substantially.

20. The lighting apparatus according to claim 1 , further comprising a cylinder-shaped cap provided at part of the heat-transfer member, wherein an inner surface of the heat-transfer member contacts air.

21. A lighting apparatus, comprising:
at least one light source that emits light;
a heat-transfer member including an outer surface on which the at least one light source is disposed, the heat-transfer member including a first spherical head portion and a first circular truncated cone shaped body portion which is integrally formed and forming a hollow space;
a light guiding member that includes a second spherical head portion and a second circular truncated cone shaped body portion, the light guiding member contacting along the outer surface of the heat-transfer member and covers the at least one light source and at least part of the outer surface of the heat-transfer member; and
a reflection member that is provided on an outer surfac

Assignees

• Kato Mitsuaki
• Hisano Katsumi
• Shiratsuchi Masataka
• Takamatsu Tomonao
• Suzuki Tomoyuki
• Toshiba Kk

Inventors

• Kato Mitsuaki
• Hisano Katsumi
• Shiratsuchi Masataka
• Takamatsu Tomonao
• Suzuki Tomoyuki

Classifications

• F21V17/101

  permanently, e.g. welding, gluing or riveting · CPC title

• F21V29/004

  Mechanical Engineering · mapped topic

• F21K9/52

  Mechanical Engineering · mapped topic

• F21K9/135 Primary

  Mechanical Engineering · mapped topic

• F21Y2101/00

  Point-like light sources · CPC title