Electric heating – Inductive heating – Specific heating application
Patent
1997-03-12
1999-05-11
Leung, Philip H.
Electric heating
Inductive heating
Specific heating application
219675, 373139, H05B6/40
Patent
active
059025085
ABSTRACT:
An induction heating coil used in a floating zone melting method, characterized in that the path of a high-frequency current is controllable in the body surface of the coil and by the use of the coil a more uniform resistivity profile across a diameter is achieved as compared with those from the prior art. In the coil a second metal or alloy different in electric conductivity from a first metal or alloy of the coil is disposed in a predetermined place(s) to control the path of a high-frequency current, wherein the second metal or alloy has, for example, higher electric conductivity than the first metal or alloy and a long narrow and thin strip made of the second metal or alloy is disposed in such a manner that it meanders on the body surface of the coil between the outer and inner peripheries periodically.
REFERENCES:
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patent: 4109128 (1978-08-01), Kohl
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patent: 4506132 (1985-03-01), Keller
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patent: 4698473 (1987-10-01), Alcini et al.
Kimura Masanori
Yoshida Naosato
Leung Philip H.
Shin-Etsu Handotai & Co., Ltd.
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