| 摘要 |
PROBLEM TO BE SOLVED: To emit light beams from two light sources as one beam of light with simple constitution by providing a joining part joining the beam of light emitted from a 1st main mirror with the beam of light emitted from a 2nd main mirror so that one beam of light may be obtained. SOLUTION: A plane mirror 17 being the joining part is a total reflection mirror and is arranged on a plane passing through the intersection of the optical axes of the main mirrors 13 and 14 and inclined to both optical axes by 45 deg.. One edge of the mirror 17 is a line and is set to pass through the intersection of the optical axes of the main mirrors 13 and 14 and in parallel with the edges of the lines of sub mirrors 15 and 16. The parallel beams of light emitted from the 1st main mirror 13 and having semicircular cross section are reflected by the mirror 17. Meanwhile, the parallel beams of light emitted from the 2nd main mirror 14 and having the semicircular cross section pass by the side of the mirror 17 and straight advance. The edge of the line of the beam of light from the main mirror 13 and the edge of the line of the beam of light from the main mirror 14 come in contact with the edge of the line of the mirror 17, and both beams of light are joined and become one beam of light.
|
