Incremental printing of symbolic information – Thermal marking apparatus or processes – Specific resistance recording element type
Patent
1992-01-21
1995-06-06
Tran, Huan H.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Specific resistance recording element type
B41J 2335
Patent
active
054226619
ABSTRACT:
A thermal recording head having an electrically resistive heat-generating portion formed on an thin-walled end portion of a ceramic substrate and electrically connected to recording and return-circuit electrodes. A reinforcing or heat radiating member is disposed on at least one of opposite sides of the substrate such that a portion of the reinforcing or heat radiating member is located at the thin-walled end portion of the substrate. The thin-walled end portion is preferably partially defined by a shoulder surface which extends from one of opposite major surface of the substrate and terminates in the end face of the thin-walled end portion. The substrate preferably has a thermal conductivity within a range between 0.002 cal.cm/sec.cm.sup.2..degree.C. and 0.03 cal.cm/sec.cm.sup.2..degree.C., while the heat radiating member preferably has a thermal conductivity higher than 0.01 cal.cm/sec.cm.sup.2..degree.C. The conductivity of the substrate is preferably lower than that of the heat radiating member.
REFERENCES:
patent: 4968996 (1990-11-01), Ebihara et al.
patent: 5184344 (1993-02-01), Takeuchi et al.
Patent Abstracts of Japan, vol. 3, No. 141 (E-153) Nov. 21, 1979 & JP-A-54 118 842 (Tokyo Shibaura Denki K.K.) Sep. 14, 1979.
Patent Abstracts of Japan, vol. 11, No. 86 (M-572(2533) Mar. 17, 1987 & JP-A-61 241 162 (Matsushita Electric Ind Co Ltd) Oct. 27, 1986.
Hirota Toshikazu
Takeuchi Yukihisa
NGK Insulators Ltd.
Tran Huan H.
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