PROBLEM TO BE SOLVED: To provide a light source device capable of always emitting stable light corresponding to the target emission quantity of light to be outputted, and an endoscopic system using the same.SOLUTION: The light source device includes (n) (wherein n is an integer of 2 or above) first semiconductor light sources emitting light in the same wavelength range and a light source control means for controlling the first semiconductor light sources. The light source control means sets the value between the maximum emission quantity of first light in a case that light is emitted from (m) (wherein m is integer of 1&lem&len-1) first semiconductor light sources and the minimum emission quantity of second light in a case that light is emitted from (m+1) first semiconductor light sources as standard emission quantity and controls not only the lighting of the (m+1) first semiconductor light sources in a case that the target emission quantity of the light, which must be emitted from the light source device, is larger than the standard emission quantity so that the emission quantity of the second light becomes the target emission quantity but also the lighting of (m) first semiconductor light sources so that the emission quantity of the first light becomes the target emission quantity in a case that the target emission quantity is less than the standard emission quantity.COPYRIGHT: (C)2012,JPO&INPIT【課題】出力すべき光の目標発光量に応じて、常に安定した光を発生させることができる光源装置、および、これを使用する内視鏡装置を提供する。【解決手段】光源装置は、同一の波長範囲の光を発するn個(nは、2以上の整数)の第1半導体光源と、第1半導体光源を制御する光源制御手段とを備える。光源制御手段は、m個(mは、1≦m≦n-1の整数)の第1半導体光源から光が発せられる場合の第1光の最大発光量と、(m+1)個の第1半導体光源から光が発せられる場合の第2光の最小発光量との間の値を基準発光量として、光源装置から出力すべき光の目標発光量が基準発光量よりも大きい場合、第2光の発光量が目標発光量となるように、(m+1)個の第1半導体光源を点灯し、目標発光量が基準発光量以下である場合、第1光の発光量が目標発光量となるように、m個の第1半導体光源を点灯するように制御する。【選択図】図2
