Lighting device

• US 10,001,596 B2
• Filed: 05/07/2013
• Issued: 06/19/2018
• Est. Priority Date: 05/10/2012
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Jang, Chul Ho
• Primary Examiner(s): PAYNE, SHARON E
• Application Number:
  US14/399,603
• Publication Number:
  US 20150138829A1
• Time in Patent Office: 1,869 Days
• Field of Search: None
• CPC Class Codes: F21S 8/061 with a non-rigid pendant, i.e. a cable, wire or chain
• CPC Class Codes: F21V 15/015 Devices for covering joints between adjacent lighting devices; End coverings
• CPC Class Codes: F21V 19/0045 by tongue and groove connections, e.g. dovetail interlocking means fixed by sliding
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/00 Planar light sources
• CPC Class Codes: F21Y 2113/00 Combination of light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/0016 Grooves, prisms, gratings, scattering particles or rough surfaces
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0043 provided on the surface of the light guide
• CPC Class Codes: G02B 6/0046 Tapered light guide, e.g. wedge-shaped light guide
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0061 to provide homogeneous light output intensity
• CPC Class Codes: G02B 6/0078 Side-by-side arrangements, e.g. for large area displays

Abstract

A lighting device may be provided that includes: a body; a first light source and a second light source, which are disposed on the body and are disposed symmetrically with each other with respect to a central axis of the body; a first light guide unit which is disposed on the first light source and is coupled to the body; and a second light guide unit which is disposed on the second light source and is coupled to the body. The first light guide unit and the second light guide unit are disposed symmetrically with each other with respect to the central axis of the body.

Claims

1. A lighting device comprising:

a body having a predetermined length in one direction and a tubular structure with an empty interior, wherein the body includes a first recess and a second recess which are disposed symmetrically with each other with respect to a central axis of the body, wherein the first recess includes a first surface and wherein the second recess includes a second surface;

a first fixing plate disposed in the first recess of the body and on the first surface;

a second fixing plate disposed in the second recess of the body and on the second surface;

a first light source disposed in the first recess of the body and on the first fixing plate;

a second light source disposed in the second recess of the body and on the second fixing plate, wherein the first light source and the second light source are disposed symmetrically with each other with respect to the central axis of the body;

a first light guide unit including one side which is optically coupled to the first light source and is disposed in the first recess of the body; and

a second light guide unit including one side which is optically coupled to the second light source and is disposed in a second recess of the body,

wherein the first light guide unit and the second light guide unit are disposed symmetrically with each other with respect to the central axis of the body,

wherein the thickness of each of the first and the second light guide units is reduced from one side to the other side thereof,

wherein the first light guide unit and the second light guide unit are extended from the first light source and the second light source, respectively, in opposite directions from each other,

wherein the first light guide unit and the second light guide unit have a shape of which a central portion is upwardly convexly curved,

wherein each of the first light guide unit and the second light guide unit emits lights upward and downward,

wherein the first light source comprises a first substrate and a first light emitting device,

wherein the second light source comprises a second substrate and a second light emitting device,

wherein the first light emitting device is disposed in a first groove of the first light guide unit and the second light emitting device is disposed in a second groove of the second light guide unit, and

wherein the one side of the first light guide unit comprises at least one curved portion on which light from the first light emitting device is incident.

2. The lighting device of claim 1, wherein the body comprises a coupling portion which is disposed in the first and second recess and is coupled to one side of the first and the second fixing plates.

3. The lighting device of claim 1,

wherein the first and the second surfaces form an acute angle with the central axis of the body.

4. The lighting device of claim 1, further comprising a reflector disposed on at least one of the top surface, the bottom surface and the plurality of sides of the first light guide unit.

5. The lighting device of claim 4, wherein the reflector is disposed on one side of the first light guide unit.

6. The lighting device of claim 2, wherein the first and the second fixing plates are coupled to the coupling portion in a sliding manner.

7. The lighting device of claim 1, further comprising a cover which is disposed under the one side of the first and the second light guide units and allows the light from the at least one curved portion to pass therethrough.

8. The lighting device of claim 7, wherein the cover is made of an opaque material and comprises an optical transmitting plate for allowing the light from the at least one curved portion to pass therethrough.

9. The lighting device of claim 1, further comprising a first end cap and a second end cap which are coupled to both ends of the body, respectively.

10. The lighting device of claim 1, wherein the body comprises a connection member which is connected to a rope that is connected to the outside.

11. The lighting device of claim 1, wherein the at least one curved portion comprises a prism structure for allowing a part of the light from the first light emitting device to pass therethrough.

12. A lighting device comprising:

a body having a predetermined length in one direction and a tubular shape with an empty interior, wherein the body includes a first recess and a second recess which are disposed symmetrically with each other with respect to a central axis of the body, wherein the first recess includes a first surface, and wherein the second recess includes a second surface;

a first fixing plate disposed in the first recess of the body and on the first surface;

a second fixing plate disposed in the second recess of the body and on the second surface;

a first light source disposed in the first recess of the body and on the first fixing plate;

a second light source disposed in the second recess of the body and on the second fixing plate, wherein the first light source and the second light source are disposed symmetrically with each other with respect to the central axis of the body;

a first light guide unit which has one side optically coupled to the first light source; and

a second light guide unit which has one side optically coupled to the second light source,

wherein the first and the second surfaces form an acute angle with the central axis of the body,

wherein the first light guide unit and the second light guide unit are extended from the first light source and the second light source, respectively, in opposite directions from each other,

wherein the first light guide unit and the second light guide unit have a shape of which a central portion is upwardly convexly curved,

wherein each of the first light guide unit and the second light guide unit emits lights upward and downward,

wherein the first light source comprises a first substrate and a first light emitting device,

wherein the second light source comprises a second substrate and a second light emitting device,

wherein the first light emitting device is disposed in a first groove of the first light guide unit and the second light emitting device is disposed in a second groove of the second light guide unit, and

wherein the one side of the first light guide unit comprises at least one curved portion on which light from the first light emitting device is incident.

13. The lighting device of claim 12, further comprising a cover which is disposed under the one side of the first and the second light guide units and allows the light from the curved portion to pass therethrough.

14. The lighting device of claim 13, wherein the cover is made of an opaque material and comprises an optical transmitting plate for allowing the light from the curved portion to pass therethrough.

15. The lighting device of claim 12, further comprising a first end cap and a second end cap which are coupled to both ends of the body, respectively.

16. The lighting device of claim 12, wherein the body comprises a connection member which is connected to a rope that is connected to the outside.

17. A lighting device comprising:

a body having a predetermined length in one direction and a tubular shape with an empty interior, wherein the body includes a first surface and a second surface which are disposed symmetrically with each other with respect to a central axis of the body;

a first light source comprising a first substrate disposed on the first surface of the body and a first light emitting device disposed on a side of the first substrate;

a second light source comprising a second substrate disposed on the second surface of the body and a second light emitting device disposed on a side of the second substrate;

a first light guide unit disposed on the first light source comprising a first side having a first incident surface on which light from the first light emitting device is incident; and

a second light guide unit disposed on the second light source comprising a second side having a second incident surface on which light from the second light emitting device is incident,

wherein the side the first light guide unit comprises a first curved portion on which the light has passed through the first surface is incident,

wherein the side the second light guide unit comprises a second curved portion on which the light has passed through the second surface is incident,

wherein a critical angle of each of the first and second curved portions is greater than an incident angle of the light incident on each of the first and second curved portions,

wherein a cover is disposed under the side of the first and second light guide units,

wherein the first curved portion has a range from the side of the first light guide unit to a first point, and

wherein the first point is an intersection between the first light guide unit and a segment connecting the first light emitting device with one end of the cover.

18. The lighting device of claim 17, wherein the cover is made of an opaque material and comprises an optical transmitting plate for allowing the light from the first and second curved portions to pass therethrough.

19. The lighting device of claim 17, further comprising a first end cap and a second end cap which are coupled to both ends of the body, respectively.