Patent ID: 8660162
Filing Date: 2014-02-25
Classification: H01L,H01S

Abstract:
1. A semiconductor laser apparatus comprising: a base having a first electrode with a first wire-bonding portion, a second electrode with a second wire-bonding portion, a third electrode with a third wire-bonding portion and a fourth electrode with a fourth wire-bonding portion arranged on an upper surface of said base; a first semiconductor laser device, a second semiconductor laser device, a third semiconductor laser device and a photodetector arranged on said upper surface; and a first lead terminal, a second lead terminal, a third lead terminal, a fourth lead terminal and a fifth lead terminal, wherein said first semiconductor laser device, said second semiconductor laser device and said third semiconductor laser device emit respective laser beams in a first direction, said first lead terminal, said second lead terminal, said fifth lead terminal, said third lead terminal and said fourth lead terminal extend in said first direction and are arranged in this order along a second direction orthogonal to said first direction, a first end of said fifth lead terminal in said first direction has a mounting portion for mounting said base, a third direction is opposite to said first direction, a fourth direction is opposite to said second direction, said first lead terminal, said second lead terminal, said third lead terminal and said fourth lead terminal are arranged at positions in said third direction from said mounting portion, a second end of said first lead terminal in said first direction has a fifth wire-bonding portion, a fourth end of said second lead terminal in said first direction has a sixth wire-bonding portion, a fifth end of said third lead terminal in said first direction has a seventh wire-bonding portion, a third end of said fourth lead terminal in said first direction has an eighth wire-bonding portion, one electrode of said first semiconductor laser device and a top surface of said photodetector are connected to said first electrode and said second electrode, respectively, one electrode of said second semiconductor laser device is connected to one electrode of said third electrode or said fourth electrode, one electrode of said third semiconductor laser device is connected to the other electrode of said third electrode or said fourth electrode, another electrode of said first semiconductor laser device, another electrode of said second semiconductor laser device, another electrode of said third semiconductor laser device and a lower surface of said photodetector are connected to said fifth lead terminal, said first wire-bonding portion is arranged at a position in said fourth direction from said first semiconductor laser device and in said first direction from said photodetector, said second wire-bonding portion is arranged at a position in said fourth direction from said first semiconductor laser device and in said third direction from said first wire-bonding portion, said third wire-bonding portion is arranged at a position in said second direction from said third semiconductor laser device and in said first direction from said photodetector, said fourth wire-bonding portion is arranged at a position in said second direction from said third semiconductor laser device and in said third direction from said third wire-bonding portion, said first wire-bonding portion is connected with said fifth wire-bonding portion through a first wire, said second wire-bonding portion is connected with said sixth wire-bonding portion through a second wire, said third wire-bonding portion is connected with said eighth wire-bonding portion through a third wire, and said fourth wire-bonding portion is connected with said seventh wire-bonding portion through a fourth wire.