Samsung Electronics Co., Ltd.

Joji Anzai

Jae-hyun Kim

Byoung-ho Choi

Jong-Uk Kim

Jang-ho Jin

Seong-su Park

Ichiro Morishita

Shuichi Tasaka

Yong-han Yoon

Yukihiro Yamasaki

Sang-yeal Park

Chang-hoon Son

An optical disk and an optical disk reproduction device for reproducing the same are provided. The optical disk including at least one layer comprises an information storage area for storing information on the optical disk and a data area for storing data, wherein the information storage area stores information on the amount of reflection and thickness of each of a plurality of layers, and transmission speed information on a plurality of areas which constitute the data area.

Optical disk and optical disk reproduction device for reproducing same

An optical pick-up apparatus for reproducing information recorded on an optical recording medium or recording information on the optical recording medium is provided. The optical pick-up apparatus includes a light source unit which generates beams; a diffraction element which diffracts the generated beams; and an objective lens which focuses a p order diffracted beam which is used for recording and reproducing information among a plurality of diffracted beams which are diffracted by the diffraction element on any one of a plurality of information layers which are formed on an optical recording medium. A p&#xb1;1 order diffracted beam which is not used for recording and reproducing information is focused away from the plurality of information recording layers and on the surface of the optical recording medium.

Optical pick-up apparatus with diffractive optical element and optical recording/reproducing apparatus having the same

Growing community of inventors

Suwon-si, South Korea

Joji Anzai