Light emitting module and lighting apparatus having the same

Abstract

A light emitting module includes a printed circuit board (PCB) and first through m-th lighting blocks of optical semiconductor devices (‘m’ is an integer greater than one). The PCB has wiring patterns electrically connecting optical semiconductor devices. The first through the m-th lighting blocks are disposed on the PCB and configured to generate light. Each of the first through the m-th lighting blocks includes first through n-th lighting groups (each block includes at least one group), each of which includes optical semiconductor devices disposed on the PCB. Electric currents configured to flow through each of the first through n-th lighting group is substantially the same. The PCB includes a pair of bodies spaced apart from each other and ‘m’ number of elbows connecting the pair of bodies, and each elbow respectively corresponds to the first through the m-th lighting blocks.

What is claimed is: 
     
         1 . A light emitting module, comprising:
 a printed circuit board (PCB) comprising wiring patterns electrically connecting optical semiconductor devices; and   first through m-th lighting blocks of optical semiconductor devices disposed on the PCB and configured to generate light,   wherein ‘m’ is an integer greater than one,   wherein each of the first through the m-th lighting blocks comprises first through n-th lighting groups, wherein each block comprises at least one group, each of the first through n-th lighting groups comprises optical semiconductor devices disposed on the PCB, and an electric current configured to flow through each of the first through n-th lighting group is substantially the same, and   wherein the PCB comprises a pair of bodies spaced apart from each other and ‘m’ number of elbows connecting the pair of bodies, and each elbow respectively corresponds to the first through the m-th lighting blocks.   
     
     
         2 . The light emitting module of  claim 1 , wherein the first through the n-th lighting groups of each of the first through the m-th lighting blocks are electrically connected with each other in series. 
     
     
         3 . The light emitting module of  claim 1 , wherein the optical semiconductor devices in each of the first through the n-th lighting groups of each of the first through the m-th lighting blocks are electrically connected with each other in parallel. 
     
     
         4 . The light emitting module of  claim 2 , wherein a last lighting group of a (k−1)-th lighting block, wherein ‘k’ is an integer, and 2≦k≦m, is electrically connected with a first lighting group of a k-th lighting block in series. 
     
     
         5 . The light emitting module of  claim 1 , wherein each of the lighting groups comprises the same number of optical semiconductor devices. 
     
     
         6 . The light emitting module of  claim 1 , wherein the PCB comprises a plus connector and a minus connector configured to provide the optical semiconductor devices with electric power. 
     
     
         7 . The light emitting module of  claim 6 , wherein a first lighting group of the first lighting block is electrically connected to the plus connector and a last lighting group of the m-th lighting block is electrically connected to the minus connector. 
     
     
         8 . The light emitting block of  claim 1 , wherein a last lighting group of an i-th elbow is electrically connected to a last lighting group of an (i+1)-th elbow, wherein ‘i’ is an odd number smaller than ‘m’, and
 a first lighting group of j-th elbow is electrically connected to a first lighting group of an (j+1)-th elbow, wherein ‘j’ is an even number smaller than ‘m’. 
 
     
     
         9 . The light emitting block of  claim 1 , further comprising a base plate,
 wherein the first through m-th lighting blocks of optical semiconductor devices are arranged in lines to form optical semiconductor device rows.   
     
     
         10 . The light emitting block of  claim 9 , wherein the PCB further comprises openings that expose the base plate. 
     
     
         11 . The light emitting block of  claim 10 , wherein the openings of the PCB are disposed between the optical semiconductor device rows. 
     
     
         12 . The light emitting block of  claim 11 , wherein the openings of the PCB extend along a row direction and the ‘m’ elbows are spaced apart from each other by the openings of the PCB. 
     
     
         13 . The light emitting block of  claim 12 , wherein the number of openings of the PCB is smaller than the ‘m’ elbows by one.