| 摘要 |
PROBLEM TO BE SOLVED: To provide a condenser capable of surely introducing light in a receiver without arranging a cylindrical condenser mirror near the receiver.SOLUTION: As an extension inner surface 4a is continuously formed at an outlet 10 of a cylindrical condenser mirror 3, light entered at a maximum allowable angleθmax, which is liable to spread at a large angle from the outlet 10, is always reflected in the extension inner surface 4a and it can be emitted by being corrected to a small angleθwith respect to an optical axis X. Therefore, a receiver 6 does not need to be arranged near a condenser 5, the condenser 5 hardly receives an influence of radiant heat from the receiver 6, and an operation from outside of the receiver 6 to an opening 7 also becomes easy. |
