Patent ID: 7675839

Claim:
An information recording medium comprising at least: a substrate; a first recording layer formed on the substrate so as to reproduce information; a first light transmitting layer having transparency formed on the first recording layer; a second recording layer formed on the first light transmitting layer so as to reproduce information; and a second light transmitting layer having transparency formed on the second recording layer, the information recording medium further comprising: a wobbling track of which a track pitch is P 3 corresponding to a first reproducing area and being disposed in an inner circumference side of the information recording medium; and another wobbling track of which a track pitch is P 4 corresponding to a second reproducing area and being disposed in an outer circumference side of the information recording medium, wherein the wobbling track and the other wobbling track are formed on the substrate without overlapping each other, and wherein the first and second recording layers and the first and second light transmitting layers are continuously adhered over at least two areas of the first reproducing area and the second reproducing area respectively, and wherein a push-pull signal output T 3 reproduced from the first reproducing area and another push-pull signal output T 4 reproduced from the second reproducing area satisfies relations of T 3 ≧0.1, T 4 ≧0.1 and 1.5≧T 3 /T 4 ≧0.5, and wherein a wavelength of a reproducing light beam is λ and a numerical aperture of an objective lens for reproducing is NA, and further wherein P 3 , P 4 , λ and NA satisfy relations of P 3 ≦λ/NA, P 4 ≧λ/NA and P 3 >P 4 .