著者

H. Tokumaru K. Arai S. Yoshimura K. Takizawa N. Uchida H. Yoshida

出版者

The Magnetics Society of Japan

雑誌

日本応用磁気学会誌 (ISSN:02850192)

巻号頁・発行日

vol.20, no.S_1_MORIS_96, pp.S1_323-328, 1996 (Released:2011-12-15)

参考文献数

5

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The requirements for optical tapes in an optical tape recording system using a rotating optical head are presented. Along with the requirements, the best structure for a magnet-optical (MO) tape was studied. As a result, a tri-layer structure was adopted for easy production and the tri-layerd MO tapes were experimentally fabricated. Performances and problems of an MO tape were experimentally investigated using these samples. And, the following results were obtained which realized performances equal to an optical disk using a thin polyethylene terephthalate (PET) substrate. (1) The incidence of the laser is from the tri-layer side to avoid the birefringence of the PET substrate. (2) Surface roughness of the PET substrate is below Ra = 7 nm. (3) Heat-resistance of PET substrate makes recording or erasing operations in excess of ten thousand times possible. (4) MO tape (width: 1/2 inch, thickness: 10 μm) was stable in terms of optical and magnetic properties under a tape tension of 0.5 kgw. (5) Sufficient tape tension is necessary to satisfy the requirement of flatness since MO tape has a large extent of curling.

著者

H.A. Yu T. Kaneko S. Otani S. Yoshimura A. Oya

出版者

THE CARBON SOCIETY OF JAPAN

雑誌

TANSO (ISSN:03715345)

巻号頁・発行日

vol.1997, no.178, pp.101-107, 1997-07-30 (Released:2010-06-28)

参考文献数

9

被引用文献数

3 4

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It was reported that a photovoltaic cell with carbonaceous film/n-type silicon (C/n-Si) was fabricated utilizing a process in which a carbonaceous film was deposited on an n-type silicon substrate by chemical vapor deposition (CVD) of 2, 5- dimethyl-p-benzoquinone at 500°C The purpose of this work is to study preparation and structure of the carbonaceous film. In this study, the carbonaceous films were made by CVD of 2, 5-dimethyl-p-benzoquinone on a quartz substrate at a temperature between 500 and 1000°C. The 2, 5-dimethyl-p-benzoquinone shows higher reaction activity for carbonization at low temperatures. At low CVD temperatures below 700°C, the carbonization reaction of 2, 5- dimethyl-p-benzoquinone was mainly caused by pyrolysis of its methyl and carbonyl groups. The carbonaceous film deposited at low temperatures below 700°C has a typical amorphous structure, and the one deposited above 700°C has a graphite-like lamellar structure oriented along the substrate.