公开(公告)号：JP2001250269A

公开(公告)日：2001-09-14

申请号：JP2000062282

申请日：2000-03-07

Applicant: SONY CORP

Inventor： ABIKO TORU ,  SHIMOMUKAI HITOSHI ,  KURODA YUJI ,  NAKAMURA MANAMI

IPC: G11B7/254 ,  G11B7/24 ,  G11B7/257 ,  G11B11/105

Abstract: PROBLEM TO BE SOLVED: To inhibit the corrosion of an optical recording layer constituting an optical recording medium. SOLUTION: The concentration of residual chlorine ions in a light transmissive protective layer 6 formed on a side irradiated with light for recording and reproduction is reduced to

公开(公告)号：JP2001236688A

公开(公告)日：2001-08-31

申请号：JP2000048962

申请日：2000-02-21

Applicant: SONY CORP

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

IPC: G11B7/12 ,  G11B7/122 ,  G11B7/135 ,  G11B7/1372 ,  G11B7/1387 ,  G11B7/24 ,  G11B11/00

Abstract: PROBLEM TO BE SOLVED: To provide an optical recording medium in which the contribution to the formation of a spot of a converged beam can be improved when a light spot is formed in a recording layer by the converged light from an optical system. SOLUTION: The optical recording medium 80 is irradiated with a converged light beam LB from an optical system. The medium gives >=30% or about >=30% amplitude transmittance for the light in the converged light beam LB passing through outer peripheral part of the optical system and reaching the recording layer 863 in the optical recording medium 80. The optical recording medium 80 has an inorganic dielectric layer 861 in the incident side where the converged beam LB enters, and the refractive index of the inorganic dielectric layer 861 is higher than the refractive index of the optical system. The recording layer 863 is formed between dielectric layers 862 and 864. For example, the optical recording medium 80 is a phase transition type optical disk, the optical system is a near field optical system, and the converged light beam LB is obtained from blue or blue-violet laser light.

公开(公告)号：JP2001023245A

公开(公告)日：2001-01-26

申请号：JP19674699

申请日：1999-07-09

Applicant: SONY CORP

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

IPC: G11B7/004 ,  G11B7/135 ,  G11B7/24 ,  G11B7/257 ,  G11B11/105

Abstract: PROBLEM TO BE SOLVED: To provide a recording medium in which disappearance of recorded signals or damages in the optical recording medium due to accumulated heat by irradiation of light can be prevented, and to provide an optical recording device equipped with that medium. SOLUTION: The optical recording medium consists of a substrate 11, reflection film 12 formed on the substrate 11, recording layer 14 formed on the reflection film 12, and first protective layer 15 formed on the recording layer 14, and information is recorded and reproduced by irradiating the recording layer 14 with light from an optical system through the first protective layer 15 side. A light-transmitting heat radiating layer 16 which accelerates diffusion of heat from the recording layer 14 is formed on the first protective layer 15. The optical recording device is equipped with that optical recording medium.

公开(公告)号：JP2001023211A

公开(公告)日：2001-01-26

申请号：JP19652999

申请日：1999-07-09

Applicant: SONY CORP

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

IPC: G11B7/095

Abstract: PROBLEM TO BE SOLVED: To provide an optical means for converging a laser beam used to irradiate an optical recording medium, to set a numerical aperture larger by a solid immersion lens, and to highly accurately control the inclination of the solid immersion lens with respect to the an optical axis. SOLUTION: Plural conductive films 6a, 6b, 6c and 6d are formed opposite to an optical disk in the bottom surface part of a solid immersion lens 3, static electricity between these conductive films 6a, 6b, 6c and 6d and an optical disk is detected, the inclination of the solid immersion lens 3 is detected and, based on the result of this detection, the inclination of the solid immersion lens 3 is controlled.

公开(公告)号：JPH11120613A

公开(公告)日：1999-04-30

申请号：JP27602797

申请日：1997-10-08

Applicant: SONY CORP

Inventor： KURODA YUJI ,  YASUDA KOICHI ,  KASAMI YUTAKA ,  KUROKAWA KOTARO

IPC: C23C30/00 ,  G11B7/24 ,  G11B7/258

Abstract: PROBLEM TO BE SOLVED: To improve the recording and reproducing characteristics of information by forming a phase transition type recording film so as to exactly reflect the surface shape of a substrate and forming this phase transition type recording film so as to have good characteristics. SOLUTION: A reflection film 3 consisting of a material essentially consisting of Al and contg. Si at a ratio of 0.4 to 0.8 (wt.%), Fe

公开(公告)号：JP2002032934A

公开(公告)日：2002-01-31

申请号：JP2000216120

申请日：2000-07-17

Applicant: SONY CORP

Inventor： KIJIMA KOICHIRO ,  KURODA YUJI ,  ICHIMURA ISAO

IPC: G11B7/254 ,  G11B7/24 ,  G11B7/257 ,  G11B7/26 ,  G11B11/105

Abstract: PROBLEM TO BE SOLVED: To improve the problem of defects such as a scratch onto a surface layer and enhance yields and mass-productivity, in a polishing process of a surface of an optical recording medium. SOLUTION: In the optical recording medium M used at a distance of

公开(公告)号：JPH11312338A

公开(公告)日：1999-11-09

申请号：JP3508999

申请日：1999-02-12

Applicant: SONY CORP

Inventor： KURODA YUJI ,  KASAMI YUTAKA

IPC: G11B7/24

Abstract: PROBLEM TO BE SOLVED: To enable excellent direct overwriting without lowering the repetition endurance and the storage stability of a recorded signal. SOLUTION: The optical recording medium which has at least a reflecting layer 2 and a recording layer 3 of a phase-shift material on a substrate 1 is disclosed. This optical recording medium has a ratio Ac/As of >=0.9 of absorptivity Ac when the recording layer 3 is in a crystal state and absorptivity Aa when in an amorphous state and crystallization acceleration layers 5 and 6 which accelerate the crystallization of phase shifting materials are formed in contact with at least one surface of the said recording layer 3. Absorptivity control and crystallization acceleration are used in combination to surely compensate the difference in physical property between the crystal and amorphous state, thereby actualizing excellent direct overwriting.

公开(公告)号：JPH11120563A

公开(公告)日：1999-04-30

申请号：JP28589897

申请日：1997-10-17

Applicant: SONY CORP

Inventor： ICHIMURA ISAO ,  KURODA YUJI

IPC: G11B7/00 ,  G11B7/0045 ,  G11B7/0055 ,  G11B7/125

Abstract: PROBLEM TO BE SOLVED: To provide a recording compensation method for an optical disk and an optical disk recorder performing overwrite operation in a recording medium as it is of a GeSbTe system used in a DVD-RAM even in a large capacity, high density phase transition type optical disk realized by a high numerical aperture of an objective lens, or a short wavelength of a light source. SOLUTION: In the optical disk recorder making a function F=LV.NA /(λ.BL) shown by a linear velocity (LV:m/sec) of a storage medium, an objective lens numerical aperture of an optical head (NA), a wavelength of recording laser light (λ:μm) and a signal bit length (BL:μm) F >=20, and recording information on an information rewritable optical disk using a phase transition type storage medium, an irradiation pulse in recording is made a multi-pulse consisting of at least three levels, and a light emission pulse of a final end is set in a time width longer than any other irradiation pulses, and the recording compensation for the optical disk using the information rewritable phase transition type recording medium is performed by the light emission control of the recording laser light.

公开(公告)号：JPH09198709A

公开(公告)日：1997-07-31

申请号：JP904896

申请日：1996-01-23

Applicant: SONY CORP

Inventor： YASUDA KOICHI ,  YODA MARIKO ,  KASAMI YUTAKA ,  KURODA YUJI

IPC: G11B7/24

Abstract: PROBLEM TO BE SOLVED: To obtain sufficient reproduced output from information recording layers existing in the second layer and the layers above it by using a phase changing material as a recording material in the information recording layer of the first layer from a transparent substrate side. SOLUTION: A recording part 5 consisting of the information recording layer 2, a transparent layer 3 and the information recording layer 4, is formed on a transparent substrate 1. A protective film 6 is formed on this recording part 5. The information recording layer 2 is composed of three layers; a dielectric protective film 7, a phase changing material film 8 and a dielectric protective film 9. The information recording layer 4 is composed of four layers; a dielectric protective film 10, a phase changing material film 11, a dielectric protective film 12 and a reflection film 13. The information recording layers 2, 4 of this multilayered optical disk are subjected to recording of information signals as rewritable signals.

公开(公告)号：JP2001023252A

公开(公告)日：2001-01-26

申请号：JP19653099

申请日：1999-07-09

Applicant: SONY CORP

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

IPC: G11B7/12 ,  G11B7/135 ,  G11B7/26

Abstract: PROBLEM TO BE SOLVED: To easily manufacture a master disk and to accurately control an operating distance by providing a conductive film over a whole region to be exposed, which is transparent which respect to light having a wavelength equal to the wavelength which an exposing luminous flux has. SOLUTION: The device for manufacturing a master disk has an optical means consisting of a condenser lens 2 which converges a laser beam L projected from a light source to irradiate a layer 101 of a photosensitive resist applied on an optical master disk base material 51 attached to a disk rotary driving device of the device for manufacturing a master disk and a solid immersion lens(SIL) 3 which is an objective lens interposed between the optical master disk base material 51 and the condenser lens 2. A conductive film 102 formed on the side of the optical master disk base material 51 does not generate reflected light even when a laser beam is focused on the photosensitive resist layer 101 and brings recorded data capacity of higher density comparing with the case using an optical master disk forming a conductive film having metal reflection.