LIGHTING DEVICE

• US 20140009935A1
• Filed: 03/15/2013
• Published: 01/09/2014
• Est. Priority Date: 07/09/2012
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: INOUE, Michinobu, Okada, Yasuhide, Suzuki, Daigo
• Application Number:
  US13/832,789
• Publication Number:
  US 20140009935A1
• Time in Patent Office: Days
• US Class Current: 362/235
• CPC Class Codes: F21K 9/23 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
• CPC Class Codes: F21K 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21K 9/61 using light guides
• CPC Class Codes: F21V 23/002 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 Class Codes: F21V 23/006 the substrate being distinct from the light source holder
• CPC Class Codes: F21V 29/506 of globes, bowls or cover glasses
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21V 7/24 characterised by the material
• CPC Class Codes: F21V 7/30 the coatings comprising photoluminescent substances
• CPC Class Codes: F21Y 2107/00 Light sources with three-dimensionally disposed light-generating elements
• CPC Class Codes: F21Y 2107/30 on the outer surface of cylindrical surfaces, e.g. rod-shaped supports having a circular or a polygonal cross section
• CPC Class Codes: F21Y 2107/40 on the sides of polyhedrons, e.g. cubes or pyramids
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

According to one embodiment, a lighting device includes a first light source, a body section and a light distribution section. The first light source includes a light emitting element. The body section includes an attachment portion on one end portion. The first light source is attached to the attachment portion. The light distribution section is provided on the end portion of the body section and injected with light radiated from the first light source. The light distribution section has a flat shape. A peripheral portion of the light distribution section in a direction orthogonal to a central axis of the lighting device protrudes from periphery of the end portion of the body section.

Claims

1. A lighting device comprising:

a first light source including a light emitting element;

a body section including an attachment portion on one end portion, the first light source being attached to the attachment portion; and

a light distribution section provided on the end portion of the body section and injected with light radiated from the first light source,

the light distribution section having a flat shape, and

a peripheral portion of the light distribution section in a direction orthogonal to a central axis of the lighting device protruding from periphery of the end portion of the body section.

2. The device according to claim 1, wherein the peripheral portion has a curved surface convex in the protruding direction.

3. The device according to claim 1, wherein an end surface of the light distribution section on an opposite side from a side provided on the end portion of the body section is a flat surface.

4. The device according to claim 1, wherein a gap is provided between the light distribution section and a radiation surface of the first light source.

5. The device according to claim 1, wherein the light distribution section includes a translucent material.

6. The device according to claim 1, wherein the light distribution section includes at least one selected from the group consisting of glass, transparent resin, and translucent ceramic.

7. The device according to claim 1, wherein

an inclined portion is provided at the periphery of the end portion of the body section, and

the inclined portion is inclined in a direction in which the end portion side of the body section comes close to a center side of the body section.

8. The device according to claim 1, further comprising:

a second light source configured to radiate light in the central axis direction of the lighting device.

9. The device according to claim 8, wherein

the attachment portion includes a recess, and

the second light source is provided in the recess.

10. The device according to claim 1, wherein the attachment portion has a concave shape.

11. The device according to claim 1, further comprising:

a reflecting layer provided on a surface of the end portion of the body section and configured to reflect incident light.

12. The device according to claim 11, wherein the reflecting layer includes at least one selected from the group consisting of titanium oxide, zinc oxide, barium sulfate, and magnesium oxide.

13. The device according to claim 11, wherein the reflecting layer includes at least one selected from the group consisting of polyester resin-based white resin, acrylic resin-based white resin, epoxy resin-based white resin, silicone resin-based white resin, and urethane resin-based white resin.

14. The device according to claim 1, further comprising:

a plurality of grooves opening in a surface of the body section in a direction orthogonal to the central axis of the lighting device.

15. The device according to claim 14, further comprising:

a hole portion with one end portion opening on the end portion side of the body section and one other end portion opening in the groove.

16. The device according to claim 1, wherein

the first light source is provided in a plurality, and

the plurality of the first light sources are provided at positions rotationally symmetric about the central axis of the lighting device.

17. The device according to claim 1, wherein an angle between the central axis of the lighting device and an optical axis of the first light source is more than 0°

and 90°

or less.

18. The device according to claim 1, wherein an angle between the central axis of the lighting device and an optical axis of the first light source is more than 0°

and 90°

or less.

19. The device according to claim 1, further comprising:

a cover provided on an end surface of the light distribution section on an opposite side from a side provided on the end portion of the body section.

20. The device according to claim 19, wherein the cover is provided so as to cover the attachment portion and the light source in plan view.