Sony Corporation

Other

Yoshihito Fukushima

Atsushi Takeuchi

Hiroyuki Takemoto

Kazuya Hayashibe

Mineo Moribe

Kenichi Itoh

Makoto Watanabe

Takehiko Numata

Yoshihiro Muto

Teruyuki Ota

Hiroshi Nakayama

Goro Fujita

Tadao Suzuki

Mitsuo Arima

Masatsugu Suwabe

Jun Shimizu

Yusuke Suzuki

Kazutomo Miyata

Tomio Kobayashi

Takeshi Gouko

Yuko Nakamura

Kazuhiko Morisawa

Manabu Iwai

Fumiko Kagawa, Legal Representative

Hatsue Koishikawa

Masatsugku Suwabe

Disclosed herein is an optical recording medium, including: a substrate; and an information recording layer formed on the substrate, an information signal being recorded and reproduced in and from the information recording layer by radiation of a light; wherein the information recording layer includes a reflecting layer, a dielectric layer formed on the reflecting layer, and a recording layer formed on the dielectric layer, the dielectric layer includes a first dielectric layer and a second dielectric layer, and a thermal conductivity of the second dielectric layer located on the reflecting layer side is higher than that of the first dielectric layer located on the recording layer side.

Optical recording medium

An optical information recording method of recording information three-dimensionally by irradiating a laser light beam onto a medium having a servo information plane on which address information and/or servo information is recorded, is disclosed. The method includes the steps of: dividing a laser light beam from one laser light source into laser light beams, the beam including a first light beam for reading the information, and a second light beam for recording information onto the recording medium; irradiating the first light beam onto the servo information plane to read the information from reflected light of the first light beam to read the information in which optical axes of the first light beam and second light beam are arranged coaxially; and irradiating the second light beam based on the read information to be focused onto a position in a depth direction perpendicular to a horizontal direction of the recording medium.

Optical information recording method, optical information reproducing method, optical information recording apparatus and optical information reproducing apparatus

A holographic recording medium including a recording layer on a substrate, which records data information in a light interference pattern. In the holographic recording medium, information on a thermal expansion characteristic of a recording material contained in the recording layer and/or information on temperature dependency of the refractive index of the recording material are recorded within the holographic recording medium in advance.

Holographic recording medium, holographic writing system and holographic reading system

A holographic recording medium including a recording layer on a substrate, which records data information in a light interference pattern is provided. In the holographic recording medium, information on a thermal expansion characteristic of a recording material contained in the recording layer and/or information on temperature dependency of the refractive index of the recording material are recorded within the holographic recording medium in advance.

A holographic recording medium includes a recording layer on a substrate, which records data information in a light interference pattern. Information on a thermal expansion characteristic of a recording material contained in the recording layer and/or information on temperature dependency of the refractive index of the recording material are recorded within the holographic recording medium in advance.

Preventing a molded disc substrate from generating a separation pattern. To this end, a molding dieincludes a pair of stationary dieand movable die, and an outer circumference ringfor molding an outer circumference end of the disc substrate. The outer circumference ringis so mounted as to be movable along forward and backward directions in parallel with a moving direction of the movable dietoward the stationary die, and has a retaining surfacefor retaining the outer circumference of the molded disc substrate

Method for molding disc substrate

An optical recording and reproducing method is able to record and reproduce information by using an optical system using recording and reproducing light with a wavelength selected in a range of from 780 nm&#xb1;10 nm and an objective lens with a numerical aperture NA selected in a range of from 0.45&#xb1;0.01 and records and reproduces first and second optical recording mediums having different recording capacities. The first optical recording medium is constructed by using a substrate with a track pitch Tpbeing selected in a range of from 1.5 &#x3bc;m to 1.7 &#x3bc;m and a groove depth dbeing selected in a range of from 70 nm to 90 nm, and the second optical recording medium is constructed by using a substratewith a track pitch Tpbeing selected in a range of from 1.2 &#x3bc;m to 1.3 &#x3bc;m and a groove depth dof the groovebeing selected in a range of from 150 nm to 180 nm. This, the optical recording medium has compatibility with existing optical discs and has a recording density high enough to record a moving picture.

Optical recording/reproducing method for multiple recording media with different recording density

Molding die apparatus, method for disc substrate, and disc-shaped recording medium

The invention provides a fine particle dispersion composition that does not depend on a curing method and that has adaptability to the curing methods and versatility and can provide a highly transparent optical component, an optical component using the fine particle dispersion composition and a method of manufacturing the same, and an optical film laminate using the optical component, and also provides a polarization splitting device using the optical component. In order to achieve the above, there is provided an optical component, which is obtained by curing a fine particle dispersion composition, which comprises metal-oxide fine particles, an organic resin material adapted to cure by absorbing energy, one of a polyoxyethylene alkyl ether phosphoric acid-based surfactant and a polyoxyethylene alkyl ether carboxylic acid-based surfactant, each of which has a molecular weight of 500 or more, and an organic solvent.

Fine particle dispersion composition, optical component, optical film laminate, polarization splitting device, and method for manufacturing the optical component

An optical information recording medium, which includes both of a land surface and a groove surface as a recording track and presents high signal quality. The optical information recording medium includes both a land and a groove as the recording track on a substrate, in which a laser light is irradiated from a reverse side of the substrate to thereby carry out a recording and a reproduction, and an inclination angle of a groove side is 25&#xb0; or more and 40&#xb0; or less, and both of arithmetic average roughness (Ra) on the land surface and the groove surface are assumed to be 0.2 to 0.7 nm.

Optical information recording medium, original disc for optical information recording medium, and method of manufacturing the same

Optical recording and reproducing method and optical recording medium

Preventing a molded disc substrate from generating a separation pattern. To this end, a molding dieincludes a pair of stationary dieand movable dieand an outer circumference ringfor molding an outer circumference end of the disc substrateThe outer circumference ringis so mounted as to be movable along forward and backward directions in parallel with a moving direction of the movable dietoward the stationary dieand has a retaining surfacefor retaining the outer circumference of the molded disc substrate

Molding die apparatus, method for molding disc substrate, and disc-shaped recording medium

Optical information recording medium

A magneto-optical disk having recording tracks are formed along concentric grooves or a spiral groove. A non-groove region where no grooves are made is provided in a middle part of each recording track. In the non-groove region, there is formed a pit pattern representing information about the recording track. A track-counting U-groove is formed in the non-groove region, for detecting that the light spot of a reading laser beam has moved across the recording track. With the disk thus structured, it is possible to record information at high density and to access a desired recording track at high speed.

Using MSR (magnetically induced super-resolution) technology, a read-head field is applied to a magneto-optical recording medium when reading an information signal from a recording layer of a magneto-optical recording medium, in order to magnetize the read light-irradiated magnetic layer in one direction in a part of an area within the read light spot. The magneto-optical recording medium using MSR technology adopts the on-land recording method in which an information signal is written to the land, which enables read of an information signal by the MSR technology with a smaller read-head field.

Growing community of inventors

Miyagi, Japan

Yoshihito Fukushima