Lighting device having reflectors for indirect light emission

Abstract

A lighting device may be provided that includes: a heat sink which includes a base and a member extending from the base; a light source module which is disposed on a lateral surface of the member; and a reflector which is disposed on the member and has a disposition recess exposing the light source module, wherein the at least two light source modules are provided and the light source module includes a terminal plate which electrically connects the at least two light source modules, and wherein the terminal plate is disposed on the reflector.

What is claimed is: 
     
       1. A lighting device comprising:
 a heat sink which comprises a base and a member extending from the base; 
 a light source module which is disposed on a lateral surface of the member; and 
 a reflector which is disposed on a top surface of the member and has a disposition recess exposing the light source module, 
 a light transmission enclosure coupled to the base and covering the member, the light source module and the reflector 
 wherein the at least two light source modules are provided, and the light source module comprises includes a terminal plate which electrically connects the at least two light source modules, 
 and wherein the terminal plate is disposed on over the reflector lateral surface of the member. 
 
     
     
       2. The lighting device of  claim 1 , wherein the reflector has a shape corresponding to that of the member and wherein the reflector covers the member. 
     
     
       3. The lighting device of  claim 1 , wherein the heat sink comprises a receiver which passes through the base and the member, and wherein the reflector comprises a lower portion having the disposition recess, and an upper portion disposed on the receiver. 
     
     
       4. The lighting device of  claim 3 , further comprising a cover which is disposed on the reflector and is coupled to the heat sink, wherein the upper portion of the reflector has a surface convex toward the cover light transmission closure. 
     
     
       5. The lighting device of  claim 4 , wherein a minimum distance from the upper portion of the reflector to the cover light transmission enclosure is equal to or greater than 15 mm. 
     
     
       6. The lighting device of  claim 1 , wherein an angle between the lateral surface of the member and a central axis of the lighting device is equal to or greater than 0.3 degree and equal to or less than 3 degree. 
     
     
       7. The lighting device of  claim 1 , wherein the lateral surface of the member is curved and wherein the light source module comprises a flexible substrate disposed on the curved surface and a light emitting diode disposed on the substrate. 
     
     
       8. A lighting device comprising:
 a heat sink comprising a base including a heat radiating fin, and a member which extends from the base and has at least one lateral surface; and 
 a light source module disposed on the lateral surface of the member of the heat sink and comprising a light emitting device,; 
 a reflector which is disposed on a top surface of the member; and 
 a light transmission enclosure coupled to base, and covering the member, the light source and the reflector; 
 wherein the heat radiating fin comprises an upper portion and a lower portion, wherein a width of the upper portion of the heat radiating fin increases with the approach to a lower portion of the base from an upper portion of the base, wherein a width of the lower portion of the heat radiating fin decreases with the approach to the lower portion of the base from the upper portion of the base, 
 and wherein the upper portion of the heat radiating fin is disposed under a light distribution area of light emitted from the light source module and is not overlapped with the light distribution area. 
 
     
     
       9. The lighting device of  claim 8 , wherein a thickness of the heat radiating fin is equal to or larger than 0.8 mm and is equal to or less than 3.0 mm. 
     
     
       10. The lighting device of  claim 8 , wherein on the basis of a vertical axis passing through a center of the light emitting device, a maximum emission angle of the light emitting device is defined by an angle between the vertical axis and a tangent line passing through both the center of the light emitting device and a contact point of the upper portion of the heat radiating fin. 
     
     
       11. The lighting device of  claim 8 , wherein a plurality of the heat radiating fins are disposed to surround the outer surface of the base of the heat sink and are separated from each other at a predetermined interval, and wherein an interval between the outermost ends of the two adjacent heat radiating fins among the plurality of the heat radiating fins is different from an interval between the innermost ends of the two adjacent heat radiating fins. 
     
     
       12. The lighting device of  claim 8 , wherein the light source module comprises a substrate disposed on the lateral surface of the member of the heat sink, and the light emitting device disposed on the substrate, wherein an area of the lateral surface of the member is greater than that of the bottom surface of the substrate, and wherein the substrate is disposed to lean more on the lower portion of the lateral surface of the member than the upper portion of the lateral surface of the member, so that a portion of the lateral surface of the member is exposed. 
     
     
       13. The lighting device of  claim 12 , wherein a distance from the uppermost portion of the member to the uppermost portion of the substrate is equal to or greater than 3 mm and is equal to or less than 5 mm. 
     
     
       14. The lighting device of  claim 12 , wherein the heat sink comprises a receiver passing through the base and the member and wherein the member further comprises an extension part extending toward the receiver. 
     
     
       15. The lighting device of  claim 14 , wherein a length of the extension part is equal to or greater than 10 mm and is equal to or less than 20 mm on the basis of the lateral surface of the member. 
     
     
       16. The lighting device of  claim 12 , wherein a thickness of the member is equal to or larger than 2.5 mm and is equal to or less than 5 mm. 
     
     
       17. A lighting device comprising:
 a heat sink comprising a base and a member disposed on the base; 
 a light source module disposed on a lateral surface of the member of the heat sink; 
 a light transmission enclosure coupled to base, and covering the member and the light source module; 
 a housing which is disposed in the base of the heat sink and inside the member of the heat sink and is formed of a material having electrical insulation; and 
 a power supply which is received inside the housing and the member, and supplies electrical power to the light source module, 
 wherein the housing comprises an upper housing and a lower housing, wherein the upper housing is surrounded by the member of the heat sink, wherein the lower housing is surrounded by the base of the heat sink, 
 wherein the upper housing receives an upper portion of the power supply, and wherein the lower housing receives the rest a lower portion of the power supply. 
 
     
     
       18. The lighting device of  claim 17 , wherein the heat sink comprises a receiver which passes through the base and the member, wherein the receiver of the heat sink is a through-hole, and wherein the through-hole has a shape corresponding to that of the housing. 
     
     
       19. The lighting device of  claim 18 , wherein the through-hole comprises an upper portion defined by the member of the heat sink, and a lower portion defined by the base of the heat sink, and wherein a space volume of the upper portion of the through-hole is different from that of the lower portion of the through-hole. 
     
     
       20. The lighting device of  claim 17 , wherein the lower housing comprises a molding part for fixing the power supply. 
     
     
       21. A lamp, comprising:
 an optically transmissive enclosure defining a hollow interior;   a heat sink including an extension having a plurality of walls extending in a first direction into the hollow interior, the plurality of walls forming a through hole extending from a lower end of the extension to an upper end of the extension;   a plurality of first light emitting devices provided over a first wall of the plurality of walls;   a connector configured to receive electric power from an external power source;   a power circuitry extending in the first direction, wherein the power circuitry extends into the through hole from the lower end of the extension;   a base in which the power circuitry is provided;   wherein the optically transmissive enclosure transmits a light from the plurality of the first light emitting devices.   
     
     
       22. The lamp of claim 21 further comprises a cover to cover the upper end of the extension. 
     
     
       23. The lamp of claim 22, wherein the cover is a reflector. 
     
     
       24. The lamp of claim 23, wherein the reflector includes at least one sidewall extending over at least one wall of the extension. 
     
     
       25. The lamp of claim 21, wherein the power circuitry includes a plate, the plate extending into the through hole. 
     
     
       26. The lamp of claim 25, wherein the plate includes at least one lead, the at least one lead extending into the through hole. 
     
     
       27. The lamp of claim 21, wherein the plurality of first light emitting devices is provided on a first substrate, the first substrate provided on the first wall such that the first light emitting devices faces the hollow interior. 
     
     
       28. The lamp of claim 27, further comprising a plurality of second light emitting devices provided over a second wall of the plurality of walls. 
     
     
       29. The lamp of claim 28, wherein the plurality of second light emitting devices is provided on a second substrate, the second substrate provided on the second wall such that the second light emitting devices faces the hollow interior. 
     
     
       30. The lamp of claim 29, wherein the first and second substrates are coupled to each other. 
     
     
       31. The lamp of claim 21, wherein the heat sink further includes a heat sink body beneath the lower end of the extension, the heat sink body having a plurality of heat radiating fins provided on an outer circumference of the heat sink body, wherein the through hole extends through the heat sink body. 
     
     
       32. The lamp of claim 21, wherein the connector is a cap configured to be screwed into a socket. 
     
     
       33. The lamp of claim 21, wherein the plurality of walls faces a second direction, which is perpendicular to the first direction. 
     
     
       34. The lamp of claim 21, wherein the optically transmissive enclosure is a bulb shaped enclosure.