| 摘要 |
PURPOSE:To facilitate non-reflection processing on the surface of CRT by applying a coating onto the outside face of a plate glass while combining the thickness of a specific metal or a metal oxide film and a refractive index such that the lowest reflection can be achieved within predetermined wavelength range of a reflected light. CONSTITUTION:In a picture tube 1, a plate glass 4 is fixed through an organic adhesive 3 onto the surface 2' of a panel glass 2 and a complex layer 5 applied with non- reflection processing is formed onto the surface. Said layer 5 is formed by applying an organic silicate or an alcohol solution of alkoxide Si(OR)4 through a spinner onto the outer face of a glass 4, for example. Then it is burnt for predetermined time, and applied with hydrolysis and polymerization through the function of the water in the air or previously added water and an acid catalyst, then a thin transparent glass film mainly composed of SiO2 is applied. Assuming lambda0 is the wavelength of light and (n) is the refractive index of the thin film, the lowest reflection is achieved when (nd) is lambda0/4, thereby the thickness of the film is determined so as to satisfy said relation. In addition, Mg, Th, Ce, Al, Ti, Zr, La, Pr, Sb, Nd, or Zn may be employed in place of Si.
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