Sony Corporation

Mitsubishi Oil Co., Ltd.

Yoshikazu Nakamura

Yukio Taniyama

Hiroshi Iijima

Hideto Suzuki

Kazuhito Tate

Kazuhiro Yanagida

Kunihiko Moriya

Goro Muroga

Shinji Hamada

Akiyoshi Inoue

Masahiro Higashi

A data recording and/or reproducing apparatus records and/or reproduces data and data management information corresponding to the data on helical recording tracks. It can be feasible to detect the use of the helical record tracks in reproducing and immediately access the recorded data, the data record region and the data management region in recording or reproducing.

Data recording and/or reproducing apparatus and method

A data recording and/or reproducing apparatus records and/or reproduces file data by processing the file data on the unit of a predetermined block length, a data block and information data for identifying the data block on predetermined unit regions. A supplement data is recorded on a region other than the region recorded the file data, the block data and the information data for identifying within the unit regions. Thereby these data are recorded and/or reproduction processed at every predetermined units so that the bit error rate is remarkably improved.

Data recording and/or reproducing apparatus

A process for producing a pitch which is used as a raw material for producing carbon fibers is disclosed. The process comprises subjecting a petroleum heavy residual oil to hydrogenation treatment in the presence of catalysts, removing a low boiling point fraction of the oil by reduced pressure distillation, subjecting the resulting reduced pressure distillation residual oil to solvent extraction treatment, and carrying out thermal modification of the resulting extraction component. By utilizing the process for producing the pitch it is possible to use a wide variety of different types of oils in order to produce carbon fibers. The carbon fibers produced from the pitch produced according to the disclosed process have desirable characteristics.

Process for producing pitch for using as raw material for carbon fibers

Growing community of inventors

Kanagawa, Japan

Yoshikazu Nakamura