(19)
(11) EP 0 430 039 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.12.1991 Bulletin 1991/49

(43) Date of publication A2:
05.06.1991 Bulletin 1991/23

(21) Application number: 90122191.1

(22) Date of filing: 20.11.1990
(51) International Patent Classification (IPC)5: B41J 2/345
(84) Designated Contracting States:
DE FR SE

(30) Priority: 21.11.1989 JP 302890/89

(71) Applicant: ROHM CO., LTD.
Kyoto 615 (JP)

(72) Inventor:
  • Nakanishi, Masatoshi
    Ukyo-ku, Kyoto 615 (JP)

(74) Representative: Glawe, Delfs, Moll & Partner 
Patentanwälte Postfach 26 01 62
80058 München
80058 München (DE)


(56) References cited: : 
   
       


    (54) Thermal head


    (57) A thermal head of a real edge type which includes an insulative substrate (B), a plurality of heat generating resistors (R) provided at one edge on an upper surface of the insulative substrate in a parallel relation to the one edge, and individual lead patterns (Se) and a common lead pattern (Ce) provided at an edge of each of the heat generating resistors (R) to extend in a direction at right angles with an aligning direction of the heat generating resistors, in which the extended length of the respective common lead (Ce) patterns is made longer than those of the individual lead patterns (Se) so as to project beyond bonding pad portions of the individual lead patterns, with a common collective pattern directed in a parallel relation with the aligning direction of the heat generating resistors (R) being provided at the extended projecting end portions of the common lead patterns.







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