Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Matsushita Electrical Industrial Co., Ltd.

Matsushita Electric Industrial

Kenichi Nishiuchi

Nobuo Akahira

Noboru Yamada

Kenji Narumi

Eiji Ohno

Ken'ichi Nagata

Shigeaki Furukawa

Tetsuya Akiyama

Naoyasu Miyagawa

Kenichi Nagata

Kazuhisa Yamamoto

Kiminori Mizuuchi

Makoto Kato

Yasuo Kitaoka

Tomoaki Uno

Hideki Kitaura

Keiichiro Horai

Hiroaki Irie

Mitsuaki Oshima

Hiroyuki Yamaguchi

Rie Kojima

Yoshitaka Sakaue

Takashi Ishida

Shinichi Tanaka

Sadao Mizuno

Takashi Nishihara

Noboru Ito

Yuuichi Kamioka

Norifumi Oda

Mamoru Shoji

Atsushi Nakamura

Shunji Ohara

Kunio Kimura

Takeo Ohta

Hideo Kusada

Katsumi Kawahara

Mutsuo Takenaga

Kenzou Ishibashi

Yoshihisa Fukushima

Shinya Abe

Shigeru Furumiya

Hiromichi Ishibashi

Masahiko Tsukuda

Michiyoshi Nagashima

Tomio Yoshida

Akio Tsuchino

Tadaoki Yamashita

Shinji Kubota

Yukako Doi

Kazuhisa Ide

Shuji Sato

Katsuyuki Takahashi

Hajimu Oonishi

Kazutoyo Hirosawa

Ken′ichi Nagata

Tomoyoshi Miyake

Noyasu Miyagawa

In an optical information recording medium of the present invention, at least one information layer provided on a transparent substrate includes a protective layer and a write-once recording layer that are disposed in this order from the transparent substrate side. The recording layer contains at least one selected from Cr&#x2014;O, Zn&#x2014;O, Ga&#x2014;O, In&#x2014;O, Sn&#x2014;O, Sb&#x2014;O, Bi&#x2014;O, and Te&#x2014;O. The protective layer contains at least one selected from Cr&#x2014;O, Zn&#x2014;O, Ga&#x2014;O, In&#x2014;O, Sn&#x2014;O, Sb&#x2014;O, Bi&#x2014;O, and Te&#x2014;O. When the total amount of all the atoms other than oxygen atoms contained in the protective layer is taken as 100 atom %, the total amount of atoms of Cr, Zn, Ga, In, Sn, Sb, Bi, and Te in the protective layer is at least 70 atom %.

Optical information recording medium, method and apparatus for recording and reproducing for the same

According to the present invention, a recording film is partially initialized using a first light beam (A) having a wavelength for initialization, focus adjustment is performed using a second light beam (B) having a wavelength corresponding to a wavelength for recording and reproducing information on and from an information recording medium, and then the recording film is initialized using the first light beam (A), thereby it is possible to securely initialize recording films of all information layers of a multilayer information recording medium.

Initialization method for information recording medium, initialization apparatus for information recording medium, and information recording medium

An information recording medium according to the present invention includes a plurality of recording layers, and a test area for determining a recording power of a laser light for each of the plurality of recording layers, in which a first test area of a first layer and a second test area of a second layer adjacent to the first layer are provided at different radial positions.

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

The present invention provides an optical information recording apparatus and method capable of effectively determining appropriate recording parameters in a short time with favorable efficiency, when recording information onto an optical disk having different information recording conditions and information recording characteristics. An information recording condition or an information recording characteristic of an optical diskis identified, and a recording pulse position is corrected at a correction accuracy according to the identifies information recording condition or information recording characteristic, such that a recording mark is formed in a predetermined position.

Optical information recording method, optical information recording device and optical information recording medium

Because conditions for recording identification data of a medium vary in accordance with the structure of different media, such as a single-layer or a multiple-layer structure, stable data recording has been a difficult task. To solve this problem, an incident side of the laser beam for recording identification data on a single-layer optical diskand a double-layer optical diskis the opposite side of a substrateupon which user data is recorded. From this structure, even in a double-layer optical diskthe recording is not affected by the recording layer of a second layerand the like. Therefore, in the double-layer optical diskidentification data of the medium can be recorded under the same conditions as the single-layer optical disk

Method of recording information, equipment thereof and information recording medium

Optical information recording method, optical information recording device, and optical information recording medium

An optical information recording medium includes one or more information layers including a recording layer for recording/reproducing an information signal by irradiation with a laser light, and a seperating layer or a protective substate on which a first information layer of the information layer on the irradiation face side is formed. The seperating layer or the protective substrate having a guide groove spirally or concentrically formed on the surface, and the respective inclined planes on the inner perimeter side and the outer perimeter side of the guide groove having inclined angles &#x3b1; and &#x3b2; with respect to the bottom face of the guide groove. The guide groove has one or more dissymmetric regions in the radius direction where the inclined angles &#x3b1; and &#x3b2; are different. The information layer has roughly agreeing thicknesses in the inclined face portion on the inner and outer perimeter sides in the dissymmetric region.

Optical information recording medium and manufacture method thereof

A plurality of types of recording pulse control rules for which the recording pulse waveform is determined according to the information signals to be recorded are stored in advance in an optical disk. When recording to the optical disk, information is recorded using a recording pulse where, due to the focused laser beam, the temperature in the recording layer cools more rapidly at a second information recording layer closer to the side where light is incident than at a first information recording layer farther away from the side where light is incident.

Optical information recording method, optical information recording and reproducing device, and optical information recording medium

An optical information recording medium includes a plurality of recording layers, a reflectance of at least one of the plurality of the recording layers in a non-initialized state with respect to a light beam for initialization being smaller than a reflectance of the same in an initialized state with respect to the light beam for initialization. The recording layers are initialized by irradiating, among the plurality of recording layers, the recording layer positioned farther from a light beam irradiation side with the light beam prior to irradiating the recording layer positioned closer to the light beam irradiation side, so that the initialized recording layers have no initialization irregularities. In initialization, at a position at a same distance in a radial direction on the optical information recording medium, the recording layer positioned farther from a light beam irradiation side is irradiated with one light beam before the recording layer positioned closer to the light beam irradiation side is irradiated with another light beam so that the plurality of recording layers are initialized at the same time by a light beam projecting operation in which the light beams are focused at different positions. This ensures the initialization without irregularities within a short time.

Optical information recording medium, method for manufacturing the same, and initialization device

The present invention provides an optical information recording medium of excellent signal quality in high density recording onto a semitransparent information layer, its manufacturing method and a manufacturing apparatus. The optical information recording medium of the present invention includes at least a semitransparent information layer disposed between a circular transparent substrate and a protective substrate, in which the information layer has spiral grooves for guiding a light beam, and also includes a recording film capable of recording/reproducing information thereon/therefrom by changing at least in two states detectable optically by irradiation of the light beam from the transparent substrate side, and the difference in film thickness of slope portions of the inner circumferential side and outer circumferential side of the groove is within &#xb1;10% in the entire region for recording/reproducing information.

Optical information recording medium and method of manufacturing thereof, manufacturing apparatus, recording/reproducing method, and recording/reproducing apparatus

A method for appropriately performing initialization of an optical information recording medium is provided, in which an initialization process is prevented from stopping so that yield from manufacturing the optical information recording medium is improved. In the initialization of an information layer with a burst cutting area (hereinafter referred to as 'BCA'), at least one of the initialization conditions including a laser power, a linear speed, and a focal point of the laser beam for the information layer is changed between the BCA region and a data area that is an area for recording and reproducing information. In the initialization of an information layer without the BCA, at least one of the initialization conditions including a laser power, a linear speed, a focal point of the laser beam for the information layer and a feed pitch is changed between the area corresponding to the BCA and the area corresponding to the data area.

Optical information recording medium and method for manufacturing the medium

An optical information recording medium according to the present invention includes a first information recording layer on which information is to be recorded by laser light; and a second information recording layer on which information is to be recorded by the laser light which has passed through the first information recording layer. The first information recording layer includes at least one of a reproduction-only area and a recording and reproduction area. The second information recording layer includes a test recording area. At least one of the reproduction-only area and the recording and reproduction area, and the test recording area is located such that one of the reproduction-only area and the recording and reproduction area includes an area of the first information recording layer through which the laser light for recording information in the test recording area passes.

Optical information recording medium containing a plurality of recording layers provided with characteristics to achieve optimum recording conditions

Optical information recording method and apparatus for multiple recording layer medium

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Hirakata, Japan

Kenichi Nishiuchi