| 摘要 |
PURPOSE:To enable the observation of an object to be irradiated by using a material having wavelength selectivity to reflection and transmission of rays to constitute reflection mirrors each consisting of a geometrically curved surface having a focus. CONSTITUTION:A thin film of such a material which reflects IR rays and allows transmission of visible rays, for example, gold, titanium oxide, etc., is coated on a reflecting surface 4 of the reflection mirror 2 and a reflecting surface 5 of the reflection mirror 3. The IR rays among the rays radiated from a light source 1 installed at one focus F1 of an elliptically curved surface are reflected by the reflecting surfaces 4 and 5 and are condensed to the other focus F2. These IR rays transmit a quartz vessel 7 and heat the object 8 to be heated installed at the other focus F2. On the other hand, the visible rays which are radiated from the light source 1 and are reflected by the object 8 to be heated transmit the thin films coated on the reflecting surface 4 and the reflecting surface 5. The state of the object 8 to be heated under heating is thereby observed.
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