Patent ID: 7957230
Filing Date: 2011-06-07
Classification: G11B

Abstract:
1. An information recording medium having at least a read only area and a recording and reproducing area comprising at least: a substrate; a recording layer formed on the substrate so as to record and reproduce information; and a light transmitting layer having transparency formed on the recording layer, the information recording medium further comprising a wobbling groove corresponding to the read only area and another wobbling groove corresponding to the recording and reproducing area formed on the substrate without overlapping each other, wherein the recording and light transmitting layers are continuously adhered over at least two areas of the read only area and the recording and reproducing area, and wherein reflectivity of the recording layer is more than 5%, and wherein a push-pull signal output T wherein the wobbling groove corresponding to the read only area contains a wobbling groove modulated by the frequency-shift keying method, and wherein the wobbling groove corresponding to the read only area is recorded with control data in a wobbling shape, and wherein the control data is specific code data of recording strategy information, and wherein the other wobbling groove corresponding to the recording and reproducing area contains a wobbling groove modulated by any one of the frequency-shift keying method, the phase-shift keying method, and the amplitude-shift keying method, and wherein a track pitch of the wobbling groove corresponding to the read only area is P 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