| 摘要 |
PURPOSE:To prevent the occurrence of dewfall on mirror face by change in the atmospheric temperatures by a method in which a heat storage material composed of specific polyethylene glycol is attached to the back side of the mirror face of a reflecting mirror and the temperature of the mirror face is kept equally to the atmospheric temperature. CONSTITUTION:A disc-shaped press plate 15 is formed in a circular arc form having the same cross section as a mirror face 17 on the back side of the face 17 and a space 18 is formed between the plate 15 and the mirror 16. The peripheral end of the space 18 is fixed to the a back plate 12 fixed in parallel to the upside of a strut 10. A polyethylene glycol #400 having a melting point of 0-10 deg.C as a heat storage material is inserted into the space 18 and the stepped part 14 of the back plate 12 is fixed to the peripheral step 20 of the mirror 16. According to the atmospheric temperatures, the material 19 is contracted to form a space 21 and the temperature of the mirror face is kept equally to the atmospheric temperature, Even when the atmospheric temperature changes at the melting point, the fogging by dewfall of the mirror face can be prevented. |
