| 摘要 |
PURPOSE:To provide a high reflection factor and a guide track and to record a signal on a prescribed location, by adhering a recording member to a rugged surface of a base having a flat surface on one side and the ruggedness on the other side, coating a thermal insulation member having a light transmittance on the recording member, and adhering a metal having a high reflection factor on the surface of the opposite side. CONSTITUTION:A recording member 12 is adhered on a rugged surface of a transparent base 11 having a flat surface on one side and a rugged surface on the other side to a degree that a part of rays is transmitted. A metallic film 14 having a high reflection factor is adhered to a surface opposite to the side of the recording member 12 of the thermal insulation member 13 coated on the recording member 12. The thickness of the thermal insulation member 13 is assumed as the optical length from the base recessed surface 15 to the metallic film 14 is (2n+1)/2 wavelength(where; n=0, 1...) and from the base projected surface 16 to the metallic film 14 is (22+1)/4 wavelength(where; n=0, 1...) in the optical length from the rugged surface of the base 11 to the metallic film 14. Various focusing systems as to the reflecting system are used with this constitution, and since a bright guide track is provided, the tracking is made easily. In this case, signals are recorded on the base projecting surface 16. |
