Victor Company of Japan, Limited

Jvc Kenwood Corporation

Jvc Victor Company of Japan, Ltd.

Tetsuya Kondo

Kenji Oishi

Hirofumi Nagano

Eiji Nakagawa

Akira Nishizawa

Takeo Kojima

Kei Murata

Noboru Kawai

Katunori Ohshima

Takeyoshi Suetsuna

Yoshikazu Nagai

In an optical disk including at least a rewritable phase change material and comprising a recording layer having a reflectivity of more than 15%, an address output value as an address pit signal component occupying in a reproduced signal in a non recording state is prescribed to be 0.18 though 0.27 or a numerical aperture of an address pit signal occupying in a reproduced signal in a non recording state is prescribed to be more than 0.3.

Optical information recording medium, and substrate and manufacturing method for the optical information recording medium

An environmental load information of an information recording medium is recorded on the information recording medium so as to recycle or dispose properly an information recording medium, which is not necessary any more. The information recording medium comprises a main information area () for recording or reproducing information and a recording area () for environmental load information, which is recorded with an environmental load information of the information recording medium.

Information recording medium and reproducing apparatus therefor

An information recording mediumat least comprises a substratehaving a microscopic pattern, which is constituted by a shape of continuous substance of approximately parallel grooves formed with a groove section G and a land section L alternately, a recording layerformed on the microscopic patternand a light transmission layerformed on the recording layer. The microscopic patternis formed so as to satisfy a relation of P&#x3c;&#x3bb;&#x3c;NA and a thickness of the light transmission layeris within a range of 0.07 to 0.12 mm, wherein P is a pitch of the groove section G or the land section L, &#x3bb; is a wavelength of reproducing light beam and NA is a numerical aperture of an objective lens. Further, there provided an information recording medium, which is improved in cross erase and recorded in high density, and a reproducing apparatus and a recording apparatus for the information recording medium.

Recording medium having a substrate containing microscopic pattern of parallel groove and land sections and recording/reproducing equipment therefor

An information recording medium is at least composed of a substrate having a microscopic pattern constituted by a continuous substrate of grooves formed with a groove portion and a land portion alternately, a recording layer formed on the microscopic pattern for recording information, and a light transmitting layer formed on the recording layer. The microscopic pattern is formed with satisfying a relation of P&#x2266;&#x3bb;/NA, wherein P is a pitch of the land portion or the groove portion, &#x3bb; is a wavelength of reproducing light for reproducing the recording layer, and NA is a numerical aperture of an objective lens. The land portion is formed with wobbling so as to be parallel with each other for both sidewalls of the land portion. An auxiliary information based on data used supplementally when recording the information and a reference clock based on a clock used for controlling a recording speed when recording the information is recorded alternately. Information is recorded in the recording layer corresponding to only a land portion by at least either one change of reflectivity difference and refractive index difference in the recording layer so as to be more than 5% for reflectivity and so as to be more than 0.4 for modulated amplitude of signal recording.

Optical recording medium having auxiliary information and reference clock

Plural grooves or lands formed in an information recording carrier include at least a wobbling region and data is recorded wobblingly in this wobbling region by phase shift modulation while recorded digitally with a single or multiple waves as a channel bit.

Information recording carrier and information reproducing apparatus for the same

A recording medium includes first information selected from a plurality of information patterns and second information selected from another plurality of information patterns for the true-false judgement. A true-false judging device performs a statistic analysis when any coincidence is found between the readout combination of the first and second information and registered combination patterns, to identify an inspected recording medium as a forged product based on the result of the statistic analysis.

Disklike recording media, a method for detecting forged disks, an anti-forgery system for performing a true-false judgement based on information collected from the recording media, and a manufacturing apparatus for recording information in the disks

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Kanagawa-ken, Japan

Tetsuya Kondo