| 摘要 |
<p>Over a disk substrate having a projection/depression groove track formed at least on one major face, there is provided a multilayer film in which a first dielectric layer, a recording layer, a record assisting layer, a second dielectric layer and a first reflecting layer are formed in this order. An ultraviolet-curing resin layer is so provided as to cover the multilayer film. The thickness of the record assisting layer is controlled to satisfy d/4 < a < 3d, preferably d/2 ≤ a ≤ 2d where d is the thickness of the recording layer and a is the thickness of the record assisting layer. The order of the layers of the multilayer film may be reversed, and in this case light-transmitting sheet is so provided through an adhesive layer as to cover the multilayer film.</p> |
