Edwards Wildman Palmer LLP
Optical information recording medium, reproducing device for optical information recording medium, and reproducing method for optical information recording medium
In an optical information recording medium (1), a light-transmitting layer (10) or a transparent substrate, an information recording layer (20), and a substrate (30) are stacked in this order from a side from which reproducing light (2) enters. The information recording layer (20) includes at least a reproducing film (21) whose complex refractive index at a light source wavelength (λ) of the reproducing light (2) is changed by heat. The relationship of 0.67×(λ/NA)>TP>0.04×(λ/NA) is satisfied, where TP is a track pitch of prepits (31) formed on the substrate (30), and NA is a numerical aperture of an objective lens (55) for converging the reproducing light (2) on the optical information recording medium.
Sharp Kabushiki Kaisha
G G
G11B G11B
inventional inventional
Masanori Yasuhiro Hirohisa Masaki Toshihiko Hideharu Go Nobuyuki
Shimo Harada Yamada Yamamoto Sakai Tajima Mori Takamori