Hitachi Maxell, Limited

Hitachi, Ltd.

Mitsubishi Kagaku Media Co., Ltd.

Hideki Nagano

Hiroshi Yoshida

Toshinori Sugiyama

Yutaka Kurose

Hideyuki Kubo

Reiji Tamura

Tamotsu Iida

Hironori Ota

Toshiaki Taii

Hirokazu Hasegawa

Yuji Yamazaki

Takeshi Kuriwada

Yoshiyuki Nagataki

Mikihito Takenaka

Feng Chen

It is an object to provide a microstructure having cylindrical microdomains oriented in the film thickness direction and arranged in a regular pattern, for which a microphase separation phenomenon of a block copolymer is utilized. The process for producing the microstructure includes 2 steps; the first step for arranging, on a substrate (), a polymer layer at least containing a block copolymer having a first block which constitutes a continuous phase () of the microstructure () and a second block which constitutes microdomains () dispersed in the continuous phase () and oriented in the thickness direction; and second step for thermally treating the substrate () at a neutral temperature (Tn), at which a first material (A) and second material (B) which constitute the respective first and second blocks have substantially the same interfacial tension with the substrate () surface (X).

Microstructure, pattern medium and process for producing same

An information recording method allows optical information having a recording mark length smaller than a spot diameter of laser light to be recorded on an optical recording medium having a recording layer, at high density by laser light pulse application. The information recording method has: a power calibration step of determining a recording power for recording a signal having a predetermined signal length in the recording layer using the laser light; and a complementing step of complementing, based on the recording power determined in the power calibration step, a recording power for recording a signal having a signal length equal to or less than &#xbd; of the spot diameter of the laser light in the recording layer using the laser light. In the information recording method, for example, an extremely small mark, such as a 2T signal, can be precisely formed.

Information recording method and information recording medium

An optical disk includes a recording region formed on a substrate for recording user data, and a management region formed on the substrate which includes an identification information region for recording disk-specific identification information such as address information (ID), a SYNC code, or an error detection code (EDC). The identification information region in this optical disk has a flat portion (a mirror region) formed by means of sectioning part of a groove or a land in a given step. The disk-specific identification information is recorded on the identification information region inclusive of this mirror region as irreversible record marks. Moreover, a signal of the disk-specific identification information is detected by a laser beam which is servoed on the recording track of this optical disk. Then, a change in the detected signal level of the disk-specific identification information is detected based on a predetermined threshold level.

Optical disk, method of playing optical disk, and optical disk drive

A lubricating composition having an affinity for synthetic resins comprising a silicone oil and a fatty acid-modified silicone and a fatty acid ester. The lubricating coating composition is utilized in the preparation of a magnetic recording medium.

Lubricating composition and recording medium using the same

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Tsukuba, Japan

Hideki Nagano