摘要 |
PURPOSE:To obtain an optical disk which has no warp and can secure a satisfactory reflection factor by using a dielectric multi-layer film to a reflecting film. CONSTITUTION:The information is contained in the form of bits on a single side of a disk-shaped base board 1 and a dielectric multi-layer film is formed on the board 1 as a reflecting film 2. This film 2 has the increase of heat conductivity with use of a metal such as Al, etc. and can reflect the semiconductor laser light that is used for reading the information recorded on a disk. Thus the function of a reflecting film is attained and at the same time the warp of the disk can be prevented. |