公开(公告)号：JP2001023219A

公开(公告)日：2001-01-26

申请号：JP19503799

申请日：1999-07-08

Applicant: SONY CORP

Inventor： KIJIMA KOICHIRO ,  ICHIMURA ISAO ,  KURODA YUJI ,  OSATO KIYOSHI ,  YAMAMOTO KENJI

IPC: G11B7/135

Abstract: PROBLEM TO BE SOLVED: To prevent the transmission of heat from an objective lens to an optical disk when the objective lens is disposed in a region near the optical disk. SOLUTION: For a solid immersion lens 1, its spherical surface part is set as an incident surface 1a1, on which a laser light L is made incident, and its flat surface part is set as an opposite surface 1b for emitting the laser light L made incident from the incident surface 1a1 toward an optical disk 100, placed opposite to the optical disk 100. This solid immersion lens 1 is disposed by setting a distance between the opposite surface 1b1 and the optical disk 100, equal to 200 nm or lower, having at least a part including the opposite surface 1b1 made of a high heat conductive material, and formed in a dual structure.

公开(公告)号：JP2000298878A

公开(公告)日：2000-10-24

申请号：JP18684499

申请日：1999-06-30

Applicant: SONY CORP

Inventor： KURODA YUJI ,  KASAMI YUTAKA

IPC: G11B7/24 ,  C01B19/00 ,  G11B7/243

Abstract: PROBLEM TO BE SOLVED: To achieve improved direct overwrite even in high-speed recording by improving weather resistance and repetitive durability. SOLUTION: In the optical recording medium, recording, reproduction, and erasure are made by utilizing the reversible phase change of a recording material layer 3. The optical recording medium is composed while at least one surface of the recording material layer is in contact with a crystallization acceleration material that is selected from Si-C-O, Si-C-H, Si-C-H-O, Si-N-O, Si-N-H, Si-N-H-O, Si-C-N, Si-C-N-O, Si-C-N-H, Si-C-N-H-O, and Si-O-H. With the effect of the crystallization acceleration material, direct overwrite that has improved weather resistance and repeated durability and is also superb in high-speed recording using an extremely small beam can be realized.

公开(公告)号：JP2000187882A

公开(公告)日：2000-07-04

申请号：JP3509099

申请日：1999-02-12

Applicant: SONY CORP

Inventor： KASAMI YUTAKA ,  KURODA YUJI

IPC: G11B7/24

Abstract: PROBLEM TO BE SOLVED: To enable adaptation to a high recording density and a high transfer rate and to attain good direct overwriting. SOLUTION: A reflecting layer 2 and a recording layer 3 are successively laminated on a substrate 1 and a light transmissive layer 4 having =1.1. The differences between physical properties of the crystalline and amorphous layers are reliably compensated by adopting irradiation with the recording and reproduction light from the light transmissive layer 4 side and absorptivity control in combination and a high linear velocity and good direct overwriting are simultaneously attained.

公开(公告)号：JPH11195243A

公开(公告)日：1999-07-21

申请号：JP36106897

申请日：1997-12-26

Applicant: SONY CORP

Inventor： YASUDA KOICHI ,  KUROKAWA KOTARO ,  KURODA YUJI

IPC: G11B7/004 ,  G11B7/00 ,  G11B7/24 ,  G11B7/243 ,  G11B7/257

Abstract: PROBLEM TO BE SOLVED: To make a capacity higher and recording and reproducing characteristics better by forming a recording/reproducing layer having a light transparent layer of a specific thickness on >=2 layers of recording layers laminated via a transparent layer on a transparent substrate of a specific thickness. SOLUTION: A light reflection layer 3, a second information recording layer 4, the transparent layer 5, the first information recording layer 6 an the light transparent layer 7 of a thickness 10 to 177 microns are successively formed on the transparent substrate 2 having a thickness of 0.3 to 1.2 mm. The first recording layer 6 comprises a first dielectric protective film, a phase transition material film and a second dielectric protective film. The second recording layer 4 comprises a first dielectric protective film, a phase transition material film and a second dielectric protective film. The multilayered optical disk executes recording and reproducing of information signals which are all reloadable by each of the respective layers on the first information recording layer 6 and the second information recording layer 4. As a result, the recording density in a three-dimensional direction which is the thickness direction of the recording layers is increased.