LIGHT SOURCE DEVICE

To provide a light source device which can enhance the homogeneity of optical output between a plurality of light emitting elements.SOLUTION: A light source device comprises: a baseboard with a plurality of light emitting elements arranged on one principal surface; and a cooling plate joined to the other principal surface of the baseboard and including a spiral flow passage in which a refrigerant circulates. The cooling plate includes: a refrigerant flow-in port; a refrigerant flow-out port; a first flow passage which is connected to the flow-in port and in which the refrigerant flows from the outside of the cooling plate toward the inside; and a second flow passage which is connected to the first flow passage and the flow-out port, and in which the refrigerant that has passed through the first flow passage flows from the inside of the cooling plate toward the outside. The first flow passage and the second flow passage are alternately arranged from the outside of the cooling plate toward the inside.SELECTED DRAWING: Figure 2 【課題】複数の発光素子間の光出力の均一性を高められる光源装置を提供する。【解決手段】光源装置は、一方の主面に複数の発光素子が配置された基板と、前記基板の他方の主面に接合され、冷媒が流通する渦巻状の流路を内部に含む冷却板と、を備え、前記冷却板は、前記冷媒の流入口と、前記冷媒の流出口と、前記流入口に接続され、前記冷媒が前記冷却板の外から内に向かって流れる第一流路と、前記第一流路と前記流出口に接続され、前記第一流路を通過した前記冷媒が前記冷却板の内から外に向かって流れる第二流路と、を含み、前記第一流路と前記第二流路は、前記冷却板の外から内に向かって交互に配置される。【選択図】図２