Taiyo Yuden Co., Ltd.

Hironobu Shimizu

Isao Matsuda

Ryuichi Sunagawa

Atsuo Shimizu

Daisuke Morishita

Disclosed is an optical information recording medium that can solve a problem that a BCA mark becomes unrecognizable in an optical recording medium including a recording layer using an organic coloring matter. A playback signal in a burst cut area comprises a bright-area amplitude level formed upon the playback of a part where no barcode-shaped mark has been formed, a dark-area amplitude level formed upon the playback of a part where a barcode-shaped mark has been formed, and a maximum amplitude level having a protruded waveform formed upon the reproduction of the edge of a barcode-shaped mark. When a portion intermediate between the maximum amplitude level and the dark-part amplitude level is defined as an intermediate level, the intermediate level is lower than the bright-area amplitude level.

Optical information recording medium

A dye or dyes are selected, which are capable of absorbing a laser beam with a wavelength of 350 to 500 nm and are capable of recording sub-information using a laser beam with a wavelength of 640 to 680 nm or 750 to 830 nm. An optical information recording medium including the optical recording layer records sub-information (BCA information) of a type different from that of main information (data information) in a sub-information region (a BCA recording region) different from a main information area (a data area) using a laser beam.

Optical information recording medium and method of manufacturing the same

An optical information recording/reproducing method and a device are provided, which can optimally record and reproduce information onto and from an optical information recording medium such as CD-R or DVD-R for high-density recording. A reproducing signal corresponding to a pit-land pattern recorded on the optical information recording medium is obtained by irradiating laser light to the optical information recording medium to judge a relative effective spot diameter of the laser light corresponding to a standard length T according to the reproducing signal, a correction range at recording of information is specified according to the judged effective spot diameter, a recording pulse is corrected according to the specified correction range, and a correction range of the reproducing signal at reproduction of information is specified to correct the reproducing signal according to the specified correction range.

Growing community of inventors

Nasushiobara, Japan

Hironobu Shimizu