Information recording medium
View Patent ↗In an information recording medium comprising at least a substrate, a recording layer, and a resin layer, the substrate is formed with at least a pit corresponding to a read only area 31 and a groove corresponding to a recording/reproducing area 32 without overlapping with each other. A reflectivity of the recording layer is specified to be more than 10%. The recording layer and the resin layer are continuously adhered over both the read only and recording/reproducing areas 31 and 32 . The information recording medium is characterized in that both push-pull signal outputs T 1 and T 2 , which are reproduced from the read only area 31 and the recording/reproducing area 32 respectively, are more than 0.1 and satisfy an inequality 1.5≧T 1 /T 2 ≧0.5.
1. An information recording medium comprising at least a substrate, a recording layer, and a resin layer,
wherein said substrate is formed with a pit corresponding to a read only area and a groove corresponding to a recording/reproducing area, and wherein said pit and said groove do not overlap with each other, and
wherein a reflectivity of said recording layer is more than 10%, and
wherein said recording layer and said resin layer are formed continuously over at least two areas of said read only area and said recording/reproducing area, and
wherein a push-pull signal output T 1 reproduced from said read only area is more than 0.1 and another push-pull signal output T 2 reproduced from said recording/reproducing area is more than 0.1, and wherein 1.5≧T 1 /T 2 ≧0.5, and
wherein said pit is modulated by the 8/16 modulation method.
2. A recording method for recording on an information recording medium comprising at least a substrate, a recording layer, and a resin layer,
wherein said substrate is formed with a pit corresponding to a read only area and a groove corresponding to a recording/reproducing area, and wherein said pit and said groove do not overlay with each other, and
wherein a reflectivity of said recording layer is more than 10%, and
wherein said recording layer and said resin layer are formed continuously over at least two areas of said read only area and said recording/reproducing area, and
wherein a push-pull signal output T 1 reproduced from said read only area is more than 0.1 and another push-pull signal output T 2 reproduced from said recording/reproducing area is more than 0.1 and wherein 1.5≧T 1 /T 2 ≧0.5,
wherein recording is conducted by forming a mark by converging a laser beam, which irradiates the recording layer from said substrate side through an objective lens, on said groove constituting said recording/reproducing area.
3. A recording method for recording on an information recording medium comprising at least a substrate, a recording layer, and a resin layer,
wherein said substrate is formed with a read only area and a recording/reproducing area, and wherein said read only area and said recording/reproducing area do not overlay with each other, and
wherein a reflectivity of said recording layer is more than 10%, and
wherein said recording layer and said resin layer are formed continuously over at least two areas of said read only area and said recording/reproducing area, and
wherein a push-pull signal output T 1 reproduced from said read only area is more than 0.1 and another push-pull signal output T 2 reproduced from said recording/reproducing area is more than 0.1, and wherein 1.5≧T 1 /T 2 ≧0.5,
wherein said recording layer is recorded by using a blue laser beam having a wavelength of 405 nm.