Patent ID: 7534012

Claim:
An illumination device comprising: a cylindrical light source; and a curved mirror for reflecting light radiated from the cylindrical light source, the curved mirror having a light reflection surface having a shape of a portion of an elliptic curve having a first focal point and a second focal point on a reference axis of the curved surface, in a cross-sectional surface perpendicular to the axial direction of the light source, and the cylindrical light source being disposed on the reference axis at a position between the first focal point and the second focal point, wherein the distance L 1 between the first focal point and a bottom point of the curved mirror is 1 to 40 mm; the distance L 2 between the first focal point and the second focal point is 50 to 200 mm; the distance L 3 between a light source center of the cylindrical light source and the bottom point of the curved mirror is 20 to 130 mm; and L 3 is larger than L 1 , and the sum of L 1 and L 2 is larger than L 3 .