Patent ID: 8591063

Claim:
An LED light source device comprising: a first housing that contains an LED board mounted with an LED in a substantially closed space; a second housing that contains in a substantially closed space a control part that controls the LED; a connecting part that connects the first housing and the second housing to each other and substantially thermally isolates the first housing and the second housing from each other; a fan mechanism that is provided between an opposed surface of the first housing and an opposed surface of the second housing, the opposed surfaces facing to each other, and provided such that an air inlet side faces to the second housing and an air outlet side faces outward along the opposed surfaces; an air path that has one end opening that is formed at a position facing to the air inlet side of the fan mechanism on the opposed surface of the second housing, and has the other end opening that is formed on a surface different from the opposed surface of the second housing; and a plurality of heat dissipation fins that are provided around the fan mechanism on at least one of the opposed surfaces of the first housing and the second housing, wherein: the control part has a control board having a partially substantially annular shape or a substantially annular shape; the air path is formed so as to pass through a central hole of the control board; and a path-forming wall that forms the air path plays a role as a partition between a containing space that contains the control board and the air path.