DVD-ROM/ビデオと同一容量の4.7GB DVD-に22.16Mbpsで記録再生するDVD-RAMドライブを開発した。本ドライブは新たに開発した1レンズ集積化記録用光ヘッド、トラックセンター制御/チルト制御、強化した記録系学習機能により、4.7GBの高密度記録に必要な高精度な制御と互換性および、さまざまなディスク変動に対しての安定な記録性能を実現している。また本ドライブは2.6GB DVD-の記録再生、DVD-ROMディスクの再生、CD-ROMディスクの再生を行う。

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We studied on the system design of Media Player which is possible to play various video file formats. Media Player implemented on digital television platform was successful to play video file.

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DVD-RAM is a rewritable DVD disk which has a capacity of 5.2GB. DVD-RAM disk can be recorded an MPEG2 compressed digital movie that is 2.5 hours in length, and is planned to be readable in DVD-ROM drive. DVD-RAM drive can also read CD-ROM disk and DVD-ROM disk.

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6x-16x speed DVD-RAM disk was developed. We adopted Ge-Bi-Te system phase-change material with high crystallization speed and rapid cooling disk structure. We optimized write strategy to avoid distortion of recording marks at high speed recording. Less than 9% of 5-track jitter was confirmed.

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In observing crustal deformations, strain and tilt data are usually recorded in a continuous manner with a telemetry system using leased lines. However, this system is often disrupted by such troubles as interruptions in the power supply and problems with the leased line. In order to alleviate these problems, an automated measuring system has been designed. The system consists of a microcomputer containing a newly designed interface circuit and a panel meter for analog-to-digital (AID) conversion. The system operates with low power consumption and supports a long-term continuous observation utilizing only a car battery. The system is inexpensive, easy to handle. The data recorded by the system agrees well with that by the telemetry system, and the former is reliable not only for use of tidal analysis but also for use over long periods.

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直径120mmのディスクの片面で2.6GBの記録容量をもつDVD-RAM(書換え可能なDVD)の規格バージョン1.0が完成した。完成した規格は、(1)既存のDVD-ROMドライブでもLSIの改良のみでDVD-の再生が可能、(2)専用カートリッジによりデータの信頼性を確保するとともに、DVD-ROMドライブとの互換性を考慮してディスクの取り出しも可能、などの特徴を持ち、拡張性、経済性、信頼性さらに互換性に優れている。

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A DVD video recorder is proposed that frees viewers from restrictions on when a program can be viewed by allowing a program to be played while the recorder continues to record other programs. This recorder also makes recording, viewing, searching and managing programs much easier than with a conventional VCR. The recorder consists of two MPEG1+ video encoders, one MPEG2 decoder, a DVD drive with a disk changer, and a hard-disk-drive.

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We have developed a DVD-ROM Drive "GD-2000" and a DVD-RAM Drive "GF-1000". GD-2000 can transfer DVD-ROM data at double speed and can reproduce many kind of disc data, as CD-ROM, CD-R and the others. In addition to these features of GD-2000. GF-1000 has a large recordable capacity of 2.6GB. This paper presents these features of DVD Drives, optical-head and LSI systems.

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The die design for cold forging is very important, because the die material is exposed to heavy stress. In order to make precise cold forged products, the die for cold forging must be designed in due consideration of deformation by working pressure. But a lot of cost can not be payed to die design, therefore low cost analysis system for cold forging die has been developed by means of personal computer and BEM. Although personal computer is used, the maximum number of boundary elements is 250, and in usual case CPU time is within 30 minutes. In order to make this system practically useful, a lot of automatic data generation programs and an evaluation program of internal working pressure are added.

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