EP0430039B1 - Tête thermique - Google Patents

Tête thermique Download PDF

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Publication number
EP0430039B1
EP0430039B1 EP19900122191 EP90122191A EP0430039B1 EP 0430039 B1 EP0430039 B1 EP 0430039B1 EP 19900122191 EP19900122191 EP 19900122191 EP 90122191 A EP90122191 A EP 90122191A EP 0430039 B1 EP0430039 B1 EP 0430039B1
Authority
EP
European Patent Office
Prior art keywords
heat generating
lead patterns
thermal head
edge
generating resistors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19900122191
Other languages
German (de)
English (en)
Other versions
EP0430039A2 (fr
EP0430039A3 (en
Inventor
Masatoshi Nakanishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rohm Co Ltd
Original Assignee
Rohm Co Ltd
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Filing date
Publication date
Application filed by Rohm Co Ltd filed Critical Rohm Co Ltd
Publication of EP0430039A2 publication Critical patent/EP0430039A2/fr
Publication of EP0430039A3 publication Critical patent/EP0430039A3/en
Application granted granted Critical
Publication of EP0430039B1 publication Critical patent/EP0430039B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/345—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads characterised by the arrangement of resistors or conductors

Definitions

  • the present invention generally relates to a thermal head construction, and more particularly, to a thermal head to be used in a heat transfer printer or the like.
  • a conventional thermal head of a so-called line type which includes a substrate B, for example, of alumina ceramic material (insulative substrate), a plurality of pairs of heat generating resistors R provided by forming a heat generating resistant film over an upper surface of said substrate B, a common lead pattern (or common electrode) Ce and individual lead patterns (or separate electrodes) Se respectively formed on the substrate B at the sides along opposite side edges Ra and Rb of the respective heat generating resistors R in a state confronting each other, and a protective film (not particularly shown) further formed over surfaces of said heat generating resistors R, and the lead patterns Ce and Se.
  • the known thermal head as described above is so arranged that, by causing the heat generating resistors R to selectively generate heat through impression of a pulse voltage across the lead patterns Ce and Se (i.e. the common electrode and separate electrodes), information is to be printed on a recording paper fed in a state overlapped under pressure with a thermo-sensitive paper (thermo-sensitive ribbon) with respect to said heat generating resistors R.
  • the lead patterns Ce and Se are respectively formed at the opposite side edges Ra and Rb of the heat generating resistors R as shown in Fig. 4.
  • the separate lead patterns Se are provided along the side edge Rb of each of the heat generating resistors R, while the common lead pattern Ce is disposed at the side of the other edge Ra thereof, respectively.
  • the common lead pattern Ce of the predetermined width is located, and thus, there has been such a disadvantage that in the line type thermal head, a so-called real edge type thermal head in which the heat generating resistors are disposed to be aligned at one side edge of the insulative substrate (i.e. to be closely disposed thereat) can not be constituted.
  • serial type thermal heads there is one type which adopts an edge type thermal head as shown in Fig. 2, which includes an insulative substrate B′, a plurality of pairs of meander type heat generating resistors R′ aligned at side edges Ra′ thereof with respect to one side edge Ba′ of the substrate B′ in a parallel relation thereto, and individual lead patterns (separate electrodes) Se′ provided at opposite side edge Rb′ of each pair of the resistors R′, with a common lead pattern Ce′ being disposed between said individual lead patterns Se′ as shown.
  • the common lead pattern Ce′ and the individual lead pattern Se′ are arranged in a so-called return-pattern shape.
  • the short common lead pattern Ce′ is drawn out from the central portion at the side edge Rb′ of each meander type heat generating resistor R′ in a direction away from said resistor, while the individual lead patterns Se′ longer in lengths than said common lead pattern Ce′ are also extended in a parallel relation with said individual lead patterns Se′ from the side edge Rb′ of said resistor R′.
  • Fig. 3 which is of the serial type thermal head, and adopts the edge type head construction as explained above with reference to Fig. 2, and in which lead patterns (individual lead patterns and common lead patterns) are connected through a flexible circuit board B ⁇ .
  • conductor patterns i.e. a common conductor Cc and separate conductors Sc respectively corresponding to the common lead patterns Ce ⁇ and the individual lead patterns Se ⁇ are formed on a flexible circuit board B ⁇ , and the respective patterns are connected by overlapping said patterns each other.
  • a thermal head according to the preamble part of claim 1 is disclosed in JP-A-6221559.
  • a drive IC is provided besides the collective pattern.
  • the resistors are arranged in a distance from the edge of the substrate.
  • resistors are arranged distant from the edges of the substrate, and the ICs are arranged on the substrate which necessitates a complicated wiring pattern.
  • a plurality of pairs of meander type heat generating resistors (two heat generating resistors are formed into one pair) are aligned in a parallel relation with respect to one side edge of the insulative substrate.
  • the common lead pattern and the individual lead patterns are disposed.
  • the common lead pattern and the individual lead pattern are led out in a so-called return pattern.
  • the common lead pattern is led out from the central portion of the heat generating resistor pair, while the individual lead patterns are respectively led out from opposite sides (heat generating resistor portions) of said heat generating resistor pair in a parallel relation with said common lead pattern, with said common lead pattern being extended beyond the ends of the individual lead patterns located at its opposite sides.
  • each common lead pattern is extended in a direction opposite to the heat generating resistor and towards the other side edge of the insulative substrate so as to further extend or project beyond bonding pad portions at the forward ends of the individual lead patterns.
  • a common collective pattern or a unified common lead
  • connection of the respective common lead patterns may be effected in an etching manufacturing stage. Furthermore, since it is not required to connect the respective common lead patterns to the common collective pattern through bonding by wires or to effect the connection under pressure through employment of a flexible substrate, a line type thermal head capable of realizing the real edge type may be provided at low cost.
  • a thermal head which generally includes an insulative substrate 5, for example, of an alumina ceramic material, a plurality of pairs of heat generating resistors 1, for example, of a meander type each corresponding to two dots, and formed on the upper surface of the substrate 5 along its one side edge 5a, and a common lead pattern 2 (common electrode) and individual lead patterns 3 (separate electrodes) formed on each pair of the heat generating resistors 1, and a protective film (not particularly shown) formed over the surfaces of the substrate 5, the heat generating resistors 1 and the lead patterns 2 and 3.
  • the embodiment in Fig. 1 shows a so-called thin film type line head (i.e. a head in which many heat generating dots are aligned in parallel along one side edge of the substrate).
  • the thermal head according to the present invention as shown in Fig. 1 is characterized in that the plurality of pairs of the meander type heat generating resistors 1 are aligned each in its one edge 1a in a parallel relation along the corresponding one side edge 5a of the insulative substrate 5, while the individual lead patterns 3 and the common lead pattern 2 are led out from the other side edge 1b of each of the resistors 1, with the length of the common lead pattern 2 being set to be longer than those of the individual lead patterns 3.
  • Each pair of the meander type heat generating resistors 1 is formed by providing a notch 11 at a central portion of a resistive plate so as to form heat resistor portions 1R at opposite sides, and open sides of these notches 11 are aligned to be directed towards the one side edge 5a of the substrate 5 to form an edge type head.
  • the common lead pattern 2 and the individual lead patterns 3 are disposed in a so-called return pattern form. More specifically, the common lead pattern 2 is led out from the other edge 1b of the resistor pair 1 (i.e. the edge 1b thereof remote from the corresponding side edge 5a of the insulative substrate 5), at a position corresponding to the central notch portion 11 in a direction away from said resistor pair 1.
  • the individual lead patterns 3 are led out from the opposite sides of the resistor pair 1, i.e. from the respective heat generating resistor portions 1R in a direction parallel to the common lead pattern 2.
  • the above common lead pattern 2 is set to be longer in length than the individual lead patterns 3.
  • the common lead pattern 3 is extended towards the other side edge of the substrate 5 so that the forward end of the common lead pattern 3 extends longer beyond bonding pad portions 31 and 31′ at the forward ends of the individual lead patterns 3. Furthermore, at extended end portions 21 of said common lead patterns 2, a common collective pattern 4 (or a unified common lead) is formed in a direction parallel to the aligning direction of the meander type heat generating resistor pairs 1. On the above common collective pattern 4, for example, a drive IC 6 is mounted, with pads 61 provided on the drive IC 6 and the bonding pad portions 31 of the individual lead patterns 3 being bonded to each other by bonding wires W as shown.
  • the thermal head i.e. line type head
  • many meander type heat generating resistor pairs 1 are aligned along the one side edge 5a of the insulative substrate 5, while the common lead pattern 2 in each resistor pair 1 is extended longer than the individual lead patterns 3, with the common collective pattern 4 being formed at the extended end portions 21 of the common lead patterns 2 as explained above. Therefore, the connection of the respective common lead patterns 3 with the common collective pattern 4 can be effected at the etching manufacturing stage. Moreover, it is not required to bond the respective common lead patterns 3 by bonding wires, or to connect them by the flexible substrate and the like. Accordingly, the line type thermal head capable of realizing the real edge type head may be provided through simple processing.
  • the thermal head is constituted by the insulative substrate, the plurality of heat generating resistors provided at one edge on the upper surface of the insulative substrate in a parallel relation to said one edge, and the individual lead patterns and common lead pattern provided at the edge of each of said heat generating resistors to extend in a direction at right angles with the aligning direction of said heat generating resistors, wherein the extended length of the respective common lead patterns is made longer than those of the individual lead patterns so as to project beyond the bonding pad portions of said individual lead patterns, with the common collective pattern directed in a parallel relation with the aligning direction of said heat generating resistor being provided at the extended projecting end portions of said common lead patterns.
  • the common lead patterns are made longer to extend beyond the bonding pad portions of the individual lead patterns, the common collective pattern for connection with respective common lead patterns may be disposed at the other side edge portion of the insulative substrate. Accordingly, the connection of the respective common lead patterns may be effected at the etching manufacturing stage, and thus, not only the complicated work for wire-bonding the respective common lead patterns as conventionally required is eliminated, but the disadvantage for connection under pressure through employment of the expensive flexible circuit board, etc. may also be eliminated to achieve the object of the present invention.

Claims (5)

  1. Tête thermique du type à bord réel qui comprend un substrat isolant (5), plusieurs résistances (1) de dégagement de chaleur placées à une surface supérieure du substrat isolant (5) parallèlement à un premier bord (5a) et des dessins individuels (3) de fils d'alimentation et un dessin commun (2) de fil d'alimentation placés à un bord (1b) de chacune des résistances (1) de dégagement de chaleur, en direction perpendiculaire à une direction d'alignement des résistances (1) de dégagement de chaleur, la longueur des dessins communs respectifs (2) d'alimentation étant supérieure à celle des dessins individuels (3) d'alimentation de manière que les dessins communs dépassent au-delà des parties de plages de liaison (31) des dessins individuels (3) d'alimentation, chacune des parties de plages de liaison (31, 31') étant alignée sur une résistance correspondante en direction perpendiculaire au bord (5a), un dessin collecteur commun (4) dirigé parallèlement à la direction d'alignement des résistances (1) de dégagement de chaleur étant placé au niveau des parties allongées d'extrémité des dessins communs (2) d'alimentation,
       caractérisée en ce que les résistances (1) de dégagement de chaleur sont placées à un premier bord (5a) du substrat isolant,
       un dispositif à circuit intégré est placé au-dessus du dessin collecteur (4), et
       toutes les plages de liaison (61) du dispositif à circuit intégré sont parallèles au bord (5a) et alignées sur les plages de liaison des dessins individuels (3) d'alimentation en direction perpendiculaire.
  2. Tête thermique selon la revendication 1, dans laquelle le substrat isolant (5) est formé d'une céramique d'alumine.
  3. Tète thermique selon la revendication 1, dans laquelle les résistances (1) de dégagement de chaleur sont de type sinueux.
  4. Tête thermique selon la revendication 1, dans laquelle un film protecteur est en outre formé sur le substrat (5), les résistances (1) de dégagement de chaleur, et les dessins de fils d'alimentation (2, 3, 4).
  5. Tête thermique selon la revendication 1, dans laquelle les plages de liaison (64) du dispositif à circuit intégré de pilotage et les plages de liaison des dessins individuels de fils d'alimentation sont liées mutuellement par des fils de liaison.
EP19900122191 1989-11-21 1990-11-20 Tête thermique Expired - Lifetime EP0430039B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1302890A JP2633701B2 (ja) 1989-11-21 1989-11-21 サーマルヘッド
JP302890/89 1989-11-21

Publications (3)

Publication Number Publication Date
EP0430039A2 EP0430039A2 (fr) 1991-06-05
EP0430039A3 EP0430039A3 (en) 1991-12-04
EP0430039B1 true EP0430039B1 (fr) 1997-03-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900122191 Expired - Lifetime EP0430039B1 (fr) 1989-11-21 1990-11-20 Tête thermique

Country Status (3)

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EP (1) EP0430039B1 (fr)
JP (1) JP2633701B2 (fr)
DE (1) DE69030054T2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0147671B1 (ko) * 1995-11-02 1998-08-17 김광호 감열 기록 소자
US6405357B1 (en) * 2000-05-02 2002-06-11 Advanced Semiconductor Engineering, Inc. Method for positioning bond pads in a semiconductor die

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5590381A (en) * 1979-11-19 1980-07-08 Rohm Co Ltd Thermal type head
JPS61141572A (ja) * 1984-12-14 1986-06-28 Mitsubishi Electric Corp サ−マルヘツド
JPS61148072A (ja) * 1984-12-21 1986-07-05 Mitsubishi Electric Corp サ−マルヘツド
JPS6221559A (ja) * 1985-07-20 1987-01-29 Ricoh Co Ltd サ−マルヘツド
JPS6297864A (ja) * 1985-10-24 1987-05-07 Sony Corp サ−マルヘツド
US4763136A (en) * 1986-04-08 1988-08-09 Oki Electric Industry Co., Ltd. Planar thermal head and display device incorporating the same
JPS63106644U (fr) * 1986-12-27 1988-07-09
JPH01116643U (fr) * 1988-02-03 1989-08-07

Also Published As

Publication number Publication date
JPH03161361A (ja) 1991-07-11
EP0430039A2 (fr) 1991-06-05
EP0430039A3 (en) 1991-12-04
DE69030054D1 (de) 1997-04-10
JP2633701B2 (ja) 1997-07-23
DE69030054T2 (de) 1997-07-17

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