Aluminum base plate for optical disc and manufacture thereof

Abstract

Abstract PURPOSE:To take advantage of an aluminum base plate and to decrease reflectance and uneven reflection on the surface by forming an antireflecting layer on the surface so that the light reflected from the surface is decreased. CONSTITUTION:1 is an underlying aluminum plate, 2 is a light absorptive layer for antireflection formed on the plate 1, 3 is a guide groove forming layer formed on the layer 2, and 4 is a recording layer formed on the layer 3. A coating contg. amorphous carbon powder as represented by acetylene black or pulverized graphite as a pigment commercially marketed as a black coating is usable as the material for the layer 2. The layer 2 can be formed by a simple stage using a spin coating, bar coating, spraying or electrophoresis method on the plate 1. The layer 2 is formed preferably to at least >=0.5mum thickness to make reflectance to <=20% and the optical disc medium formed in such a case has <1% reflectance distribution.

Inventors

• 👤 「ふな」越　宣博
• 👤 Norihiro Funakoshi

Bibliographic Details