Information recording medium having parallel grooves with alternating convex-concave sections

摘要: An information recording medium includes a substrate having microscopic pattern which has shape of continous substance approximately parallel grooves formed with convex shaped section and concave alternating on surface the substrate, layer that is light transmitting thickness 0.05 mm to 0.12 layer. The so as satisfy relation P≦γ/NA, wherein P pitch or section, γ wavelength reproducing beam NA numerical aperture an objective lens. Further, modulated address both side walls viewed from wobble same period phase. Furthermore, even when laser irradiated opposite medium, reproduced signal in high output quality can be obtained recorded read out accurately.