| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a device eliminating a lamp shadow by providing a first reflection mirror having an aperture at its center for reflecting light from a lamp disposed at a first focal point of an elliptical reflection mirror, and a second reflection mirror for reflecting the light reflected from the first reflection mirror and passing the light through the center aperture of the first reflection mirror to allow generation of parallel light by a lens. SOLUTION: In this device, an elliptical reflection mirror 2 reflects rays from a metal halide lamp 1 located at a focal point of the mirror 2 to a lens 6 for collimating the rays. A first reflection mirror 3 having an aperture 5 at its center reflects rays from the lamp 1 to a second reflection mirror 4. The second reflection mirror 4 is positioned in front of the lamp 1 and reflects the reflected and condensed rays from the first reflection mirror 3 toward the lens 6 to allow the lens 6 to collimate the rays. A focal point of the rays reflected by the reflection mirror 2 coincides with the focal point of the lens 6 near the aperture 5. An effective area of the reflection mirror 3 and distance between the lamp 1 and the reflection mirror 3 accurately compensate the reduction of a light intensity caused by a lamp shadow. The reflection mirror 4 is set in an accurate position and direction.</p> |
