Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element
Patent
1977-09-01
1980-12-09
Esposito, Michael F.
Recorders
Performance of multiple functions of steam and gas engines
Pressure responsive element
2503161, 346 76L, 346135, 346151, 274 46A, 427 53, 430320, 430396, 430DIG945, 358128, 350274, 350320, G01D 1534, G01D 1510
Patent
active
042388031
ABSTRACT:
A thin film is formed on a substrate, which film is made of a substantially amorphous chalcogenide having a composition of As.sub.x .multidot.Te.sub.y .multidot.Se.sub.z .multidot.G.sub.g, where G represents at least an element selected from a group consisting of S, In, Tl, Sn, Pb and Ge, and where 10 at %.ltoreq.x.ltoreq.25 at %, 50 at %.ltoreq.y.ltoreq.88 at %, 0 at %.ltoreq.z.ltoreq.40 at % and 0 at %.ltoreq.g.ltoreq.10 at %, and that x+y+z+g=100 and z+g.noteq.0. A laser beam is projected onto the thin film to form in it recesses representing information carried by the laser beam. The information recorded in the thin film exhibits a high signal-to-noise ratio and a high .gamma. characteristic. Besides, the recorded information is scarcely subjected to deterioration independently from time elapse.
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Terao Motoyasu
Yonezawa Seiji
Esposito Michael F.
Hitachi , Ltd.
Page Thurman K.
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