| 摘要 |
<p>First and second lamps 1, 2, first and second ellipsoidal mirrors 3, 4, first and second spherical mirrors 5, 6, and a plane mirror 7 are provided. The first spherical mirror 5 is provided on the same side as the first ellipsoidal mirror 3 with respect to the lamp 1, and the second spherical mirror 6 is provided on the opening side of the second ellipsoidal mirror 4 with respect to the second lamp 2, so that they reflect a respective part of light beams emitted from the first and second lamps toward the first and second ellipsoidal mirrors 3, 4. The first and second ellipsoidal mirrors are arranged such that the optical axes of their reflected light beams intersect with each other, so that they condense respective light beams emitted from the first and second lamps and respective light beams reflected at the first and second spherical mirrors 5 and 6. The plane mirror 7 reflects at a reflective film 7a, light beams condensed by the first ellipsoidal mirror 3, and transmits via a light-transmitting portion 7b where no reflective film is provided, light beams condensed by the second ellipsoidal mirror 4; accordingly, light beams emitted from the first and second lamps are combined so as to become light beams travelling coaxially and in the same direction. This can reduce the optical loss when combining light beams emitted from a plurality of lamps.</p> |
