Patent ID: 7801196

Claim:
A light source device, comprising: a plurality of first laser emission units and a plurality of second laser emission units for emitting light, wherein the plurality of first laser emission units and the plurality of second laser emission units are disposed on a flat surface, the first laser emission units and the second laser emission units are composed so that a drive for light emission is sequentially switched, and each of the second laser emission units is disposed between the adjoining first laser emission units, assuming that the minimum pitch which only produces allowable effect on light emission efficiency of the plural first laser emission units and the plural second laser emission units and allowable effect on lives of the plural first laser emission units and the plural second laser emission units at the time of simultaneous driving of the plural first laser emission units and the plural second laser emission units is an allowable limit pitch, the pitch of the respective first laser emission units is larger than the allowable limit pitch, the pitch of the respective second laser emission units is larger than the allowable limit pitch, and the pitch of the adjoining first laser emission units and the second laser emission units is smaller than the allowable limit pitch such that when one of the adjoining first laser emission units or the second laser emission units emits light, the other adjoining first laser emission units or second laser emission units does not emit light.