With objectives of providing a transparent board with conductive multi-layer
antireflection, under condition of high transmissivity not only on a glass substrate
but also on a non-glass transparent substrate with property of conductivity and
demanded resistance at most exterior surface, laminating at least three layer thin
films on a transparent substrate provides with an effect of high transmissivity
by suppressing reflection from interference of optical waves, in which the transparent
first dielectric layer thin film on the substrate that has a higher refractive
index than the substrate has, the transparent second dielectric layer thin film
next to the first-layer film that has a lower refractive index than the substrate
has, and the most exterior transparent third conductive-layer thin film.