Recently the Yomiuri News reported the following:
東北大学とソニーは２０日、テレビ録画などに使われる大容量光ディスク「ブルーレイ」より２０倍以上も記憶容量が大きい次世代光ディスク向けの小型レーザー光源を開発したと発表した。
高精細なハイビジョン映像はブルーレイでも映画２、３本しか録画できないが、この技術を応用すると、５０本以上を記録できる計算で、数年内の実用化をめざす。 光ディスクに情報を記録するには、強いレーザー光を断続的に当て、１と０のデジタル信号を書き込む。記録容量を増やすには、より小さな面積に信号を高速で書き込み、光も強くしなければならない。
このような光は長さ１メートル弱、価格１０００万円以上の実験装置でしか作れないため、これまではテレビの録画機に組み込めなかった。開発陣は既存のブルーレイのレーザー発光素子を基に、強さ１００ワット以上のレーザー光を１秒間に１０億回も繰り返し出せる能力にした上で、長さ約２センチまで小型化することに成功した。
On the 20th Tohoku University and Sony announced that they had developed a small laser beam source for the next generation optical disk that compared to the large memory capacity mass optical disk "Blue ray" now used for the television recording, the capacity was over 20 times larger.
They aimed at achieving practical use within several years. Now with blue ray recording only 2 and 3 movies in high-definition television image was possible, by calculation, to use this technology 50 or more could be recorded. A strong laser beam was intermittently applied to record information in the optical disk, and the digital signal of 1 and 0 was written. It was necessary to make the light stronger, and to write the signal in a smaller area at high speed so as to increase storage capacity.
As the pilot machine that could make such light was slightly less 1 meter in length and with a price tag of over 10 million yen, it could not be fitted into the television recording machines now we had. The development team based on existing blue ray laser light emission element aimed at achieving the laser strength of 100 watts or more, and in a second that could repeat operation as many as one billion times, and miniaturizing it up to about two centimeters in length.
Its seems that Japan is still taking the lead in the research and development of laser disk technology.
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