| 摘要 |
PURPOSE:To provide a back mirror having no blind area and rigidity with a ready fabrication by adhering a spherical inside transparent plate onto the limited area on the inside surface of a spherical outside transparent plate and then treating thin silver film adhered onto the inside surfaces of the respective transparent plates. CONSTITUTION:The outside 5 of a spherical inside transparent plate 3 is adhered onto the lower portion of the inside recess surface 2 of a spherical outside transparent plate 1. This is adhered by a transparent adhesive so that the transparency between the outside transparent plate 1 and the inside transparent plate 3 may not be obstructed at the position of the adhered portion 6. Silver thin film is formed by vacuum evaporation process or the like on the inside surfaces of the transparent plates 1 and 3 in thus adhered state to thereby form mirror treatment on the plates 1 and 3. The peripheral edges of the back palte 8 laminated with the back of the transparent plate 1 are fixed via edgewise member 9 to the transparent plate 1. |
