Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Mamoru Shoji

Takashi Ishida

Atsushi Nakamura

Motoshi Ito

Hiroshi Ueda

Yoshikazu Yamamoto

Junichi Minamino

Shigeru Furumiya

Shuichi Tasaka

Kenji Koishi

Hiromichi Ishibashi

Yasumori Hino

Eiichi Igami

Shunji Ohara

Harumitsu Miyashita

Takahiro Sato

Yuji Hisakado

Shinji Kubota

Shinji Ishida

Shin-ichi Kadowaki

Hideshi Ishihara

Masaru Yamaoka

Kohei Nakata

Takahiro Nagai

Takashi Yumiba

Keiji Nishikiori

Yuu Okada

Kiyotaka Ito

Shuji Tabuchi

Yoshihiro Kawasaki

Makoto Usui

Hiroyuki Yamaguchi

Takeshi Nakajima

Mitsuro Moriya

Naoyasu Miyagawa

Shinichi Konishi

Rie Takahashi

Hidemi Isomura

Yukihiro Yamasaki

Kenichi Nishiuchi

Kenji Narumi

Shigeaki Furukawa

Tetsuya Akiyama

Hironori Deguchi

Toshiya Akagi

Yoshito Aoki

Yoshiyuki Miyabata

Ariaki Ito

Mitsuaki Oshima

Katsuya Watanabe

Kenji Kondo

Yuji Takagi

Toyoji Gushima

Isao Kobayashi

Kazuya Hisada

Yuuichi Kuze

Toshiyuki Shimada

Yoshiharu Kobayashi

Chikashi Inokuchi

Tadashi Jahana

Akira Muto

Yasuhiro Honda

Kiyotaka Itou

Kouhei Nakata

An information recording medium of the present exemplified embodiment is configured by laminating a substrate having a predetermined thickness and a substrate having a predetermined thickness to each other. A film forming region including a recording region, a clamp region and a rib are formed on one surface of the information recording medium. A film forming region including a recording region, a clamp region and a rib are formed on the other surface of the information recording medium. On both surfaces, the components are formed in the order of the rib, the clamp region and the film forming region toward an outer peripheral side from an inner peripheral side.

Disk-shaped information recording medium, disk cartridge and information recording and reproducing apparatus

Optical disk

The disk-shaped information recording medium having an outer diameter and an inner diameter comprises a substrate having a predetermined thickness, a first side that is one side of the substrate, a second side that is the other side of the substrate, a cylindrical portion forming a through hole formed at a center of the substrate, and a thin portion formed so as to surround an outer diameter of the cylindrical portion. The thin portion is thinner than the predetermined thickness and includes a non-inclined surface and an inclined surface formed on an outer diameter side of the non-inclined surface. The inclined surface is inclined at an angle greater than or equal to 25 degrees and less than or equal to 35 degrees with respect to the non-inclined surface.

Disk-shaped information recording medium, disk cartridge, and information recording/reproducing apparatus

The disk-shaped information recording medium having an outer diameter and an inner diameter comprises a substrate having a predetermined thickness, a first side that is one side of the substrate, a second side that is the other side of the substrate, a cylindrical portion forming a through hole formed at a center of the substrate, and a thin portion formed so as to surround an outer diameter of the cylindrical portion. The thin portion is thinner than the predetermined thickness and includes a non-inclined surface and an inclined surface formed on an outer diameter side of the non-inclined surface. The inclined surface is inclined at a predetermined angle to the non-inclined surface and is larger than the non-inclined surface in the thin portion.

An optical disc drive having an optical pickup head emitting a light beam to an optical storage medium, detecting the light beam reflected from the optical storage medium, and outputting a signal based on the received reflected light, having a jitter measuring unit measuring jitter in signals output from the optical pickup head and having an evaluation unit determining from the measured jitter if the optical storage medium is good or defective. The jitter measuring unit measures jitter in a train of 3T or longer marks or spaces from an optical storage medium to which digital information is recorded as a train of marks or spaces of length kT based on a period T and an integer k of two or more.

Optical disc drive, optical storage medium, optical storage medium inspection apparatus, and optical storage medium inspection method

An optical headreproduces information recorded on an optical disc, a BCA detectorand a medium discriminating circuitacquire waveform distortion information for specifying a waveform distortion of a reproduction signal reproduced by the optical head, and a variable waveform equalizerchanges a parameter used in a distortion reduction processing for reducing the waveform distortion of the reproduction signal based on the waveform distortion information.

Optical recording medium, optical recording medium manufacturing method, reproduction signal processing method and evaluation method

An optical information storage medium according to the present invention has at least one information storage layer. The optical information storage medium has a management area that stores at least one unit containing control information about the optical information storage medium. The control information includes a format number, which provides information about at least a write strategy type and a write pre-compensation type, and a write strategy parameter, which provides information about the magnitude of shift in an edge position, or variation in the pulse width, of a write pulse train to form a recording mark. And the value of the format number changes according to a combination of the write strategy type and the write pre-compensation type.

Optical information recording medium, information recording apparatus, information reproducing apparatus, information recording method, information reproducing method and method for producing optical information recording medium

An optical disc includes a reflective film formed on concave and convex marks after the concave and convex marks are synchronized with the integral multiple of a channel bit length and formed in accordance with modulated main information. Thereafter, continuous or intermittent laser light synchronized with the integral multiple of the channel bit length is irradiated at intervals longer than the longest one of the concave and convex marks in accordance with a spiral track formed in a circumferential direction of the concave and convex marks, whereby an optical characteristic of the reflective film is changed to form a recordable mark and sub-information necessary to reproduce the main information is recorded in a superimposition manner.

Optical disc, optical disc manufacturing method, optical disc recording device and optical disc reproduction device

A recording power determination method for determining a recording power of an optical beam for recording data on an information storage medium includes the steps of recording test data on the information storage medium at a plurality of test recording powers; reading the test data recorded at each test recording power, generating a signal, and measuring a modulation factor of the signal corresponding to each test recording power; calculating a product of an n'th power of each test recording power and the corresponding modulation factor, thereby obtaining a plurality of products corresponding to the plurality of test recording powers, where n is a value of exponent and is a real number other than 1; calculating a first recording power based on the correlation between the plurality of test recording powers and the plurality of products; and calculating the recording power based on the first recording power.

Recording power determination method and device

The present invention provides a measure for getting read/write control information stored within a space of a predetermined size in a format that ensures compatibility with media of a lower order or an older generation even if the size of the read/write control information increases significantly as the storage densities of information storage media rise in the near future. On an information storage medium, a data sequence is writable as a combination of marks and spaces. The medium has at least one information storage layer, which has an information storage area to store information and a control information area for use to perform a read/write operation on the at least one information storage layer. The control information area stores at least one set of control information, which includes a first kind of write pulse information including information to be used as a reference value and a second kind of write pulse information including information to be used as an offset value. The size of the offset value is at least a half as large as that of the reference value.

Information recording medium, method for recording information on information recording medium, method for reproducing information from information recording medium and method for producing information recording medium

An information storage medium according to the present invention has n information storage layers (where n is an integer and n&#x2267;3), on which data can be written with a laser beam and which are stacked one upon the other. Each of the n storage layers has a test write zone for determining the recording power of the laser beam. When those n layers are counted from the one that is located most distant from the surface of the medium on which the laser beam is incident, there is a bigger radial location difference between the outer peripheral end of the inner one of the test write zones of iand (i+1)information storage layers (where i is an integer that satisfies 2&#x2266;i&#x2266;n&#x2212;1) and the inner peripheral end of the other outer test write zone than between the outer peripheral end of the inner one of the test write zones of jand (j+1)information storage layers (where j is an integer that satisfies 1&#x2266;j&#x2266;i&#x2212;1) and the inner peripheral end of the other outer test write zone.

Information recording medium and information recording apparatus

A recording/reproducing apparatus performs labeling that matches the information recorded on a recording medium. The recording/reproducing apparatus labels the content stored on a recording medium, and includes a control unit that acquires label information for labeling the content. A printing unit labels the label information on the recording medium.

Labeling method, recording method, labeling apparatus, recording apparatus and recording medium

A multi-layered information recording medium including a plurality of recording layers, the multi-layered information recording medium comprising: a user data area for recording user data; and a plurality of spare areas including at least one replacement region, wherein when the user data area includes at least one defect region, the at least one replacement region may be used in place of the at least one defect region, wherein a first spare area of the plurality of spare areas is positioned so as to be contiguous to a first user data area of a first recording layer, a second spare area of the plurality of spare areas is positioned so as to be contiguous to a second user data area of a second recording layer, and the first spare area and the second spare area are positioned approximately at the same radial position on the multi-layered information recording medium.

Multi-layered information recording medium, recording apparatus, and recording method

An optical diskis of a type in which information is recorded on a groove track, and an optical diskis of a type in which information is recorded on a land track. The optical diskhas a control data area, and a data recording areain which user data is recorded. The optical diskhas a control data area, and a data recording areain which user data is recorded. A code for indicating the groove track or the land track onto which tracking servo control is executed is provided both in the control data areaof the optical disk, and in the control data areaof the optical disk

Information recording medium, integrated circuit, recording/playback apparatus, computer program, and information recording/playback method

Growing community of inventors

Osaka, Japan

Mamoru Shoji