JPH0481514B2 - - Google Patents
Info
- Publication number
- JPH0481514B2 JPH0481514B2 JP60028819A JP2881985A JPH0481514B2 JP H0481514 B2 JPH0481514 B2 JP H0481514B2 JP 60028819 A JP60028819 A JP 60028819A JP 2881985 A JP2881985 A JP 2881985A JP H0481514 B2 JPH0481514 B2 JP H0481514B2
- Authority
- JP
- Japan
- Prior art keywords
- heating element
- sheet resistance
- thermal head
- electrically conductive
- conductive film
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 37
- 238000010586 diagram Methods 0.000 description 7
- 239000010931 gold Substances 0.000 description 7
- 229910052737 gold Inorganic materials 0.000 description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000004020 conductor Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 2
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
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
Landscapes
- Electronic Switches (AREA)
- Non-Adjustable Resistors (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明はサーマルヘツド、特にミアンダ形状
の発熱体を有するサーマルヘツドに関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thermal head, and particularly to a thermal head having a meander-shaped heating element.
（従来の技術）
ミアンダ形状の発熱体を有するサーマルヘツド
の従来構造を第６図に示す。同図において、１０
は発熱体で、例えばTa2NとかNiCrとかの材料で
形成されている。１２はこの発熱体１０と連なつ
て形成された給電体である。また、１４は発熱体
に電流を効率良く供給するため設けられている、
例えばAuとかCuとかの電気伝導度の高い材料か
らなる電極層である。これらの上側、すなわち感
熱紙と当接する側の表面に保護膜が被着されてい
るが、この保護膜の図示を省略してある。この構
造において、実際に発熱に供する発熱部はミアン
ダ形状の直線部であり、図中１６で示す。この従
来構造では、通常は給電体１２の厚みを1000〜
3000Åとし、電極層１４の厚みを１〜3μmとして
いる。(Prior Art) A conventional structure of a thermal head having a meander-shaped heating element is shown in FIG. In the same figure, 10
is a heating element, made of a material such as Ta 2 N or NiCr. 12 is a power supply body formed in series with this heating element 10. Further, 14 is provided to efficiently supply current to the heating element.
For example, it is an electrode layer made of a material with high electrical conductivity such as Au or Cu. Although a protective film is applied to the upper side of these, that is, the surface that contacts the thermal paper, illustration of this protective film is omitted. In this structure, the heat generating part that actually generates heat is a meander-shaped straight part, which is indicated by 16 in the figure. In this conventional structure, the thickness of the power supply body 12 is usually 1000~
3000 Å, and the thickness of the electrode layer 14 is 1 to 3 μm.
この従来構造では、発熱体１０の湾曲部（コー
ナ部或いは蛇行部分とも称する）１８において電
流集中が生じることが従来から確認されており、
この電流集中を防ぐため、第１図に示すような構
造の発熱体を有するサーマルヘツドが提案されて
いる。 In this conventional structure, it has been confirmed that current concentration occurs at the curved portion (also referred to as a corner portion or meandering portion) 18 of the heating element 10.
In order to prevent this current concentration, a thermal head having a heating element having a structure as shown in FIG. 1 has been proposed.
第１図に示す構造では、湾曲部１８の厚みを電
極層１４と同一の厚みとし、かつ、この湾曲部１
８を電極層１４と同一の電気良導体材料で形成し
ている。 In the structure shown in FIG. 1, the thickness of the curved portion 18 is the same as that of the electrode layer 14, and
8 is made of the same electrically conductive material as the electrode layer 14.
（発明が解決しようとする問題点）
しかしながら、この従来の構造では、この湾曲
部１８の厚みのため、発熱部１６と感熱紙との接
触が悪い。これがため、実験によると、第１図に
示す従来構造の場合には、印字に必要な電力は第
６図に示す従来構造の場合に比べて約１割増しと
なる。(Problems to be Solved by the Invention) However, in this conventional structure, the contact between the heat generating part 16 and the thermal paper is poor due to the thickness of the curved part 18. Therefore, according to experiments, in the case of the conventional structure shown in FIG. 1, the power required for printing is about 10% higher than in the case of the conventional structure shown in FIG. 6.
この発明の目的は発熱部と感熱紙との接触を損
なうことなく発熱体の湾曲部の電流集中を防ぐよ
うにした構造のサーマルヘツドを提供することに
ある。 An object of the present invention is to provide a thermal head having a structure that prevents current concentration at the curved portion of the heating element without impairing the contact between the heating element and the thermal paper.
（問題点を解決するための手段）
この目的の達成を図るため、この発明のサーマ
ルヘツドにおいては、ミアンダ形状の発熱体１０
と、この発熱体１０に連らなる給電体１２とを有
するサーマルヘツドにおいて、
この発熱体１０の感熱紙と当接する側であつて
ミアンダ形状の湾曲部１８に被着された高電気良
導体膜２０（第１図に斜線を施して示す）を有
し、
この高電気良導体膜のシート抵抗をこの発熱体
のシート抵抗の1/50〜1/100としたことを特徴と
する（第１図）。(Means for Solving the Problems) In order to achieve this object, in the thermal head of the present invention, a meander-shaped heating element 10
and a power feeder 12 connected to the heating element 10, a highly electrically conductive film 20 is attached to the meander-shaped curved part 18 on the side of the heating element 10 that comes into contact with the thermal paper. (shown with diagonal lines in Figure 1), and is characterized in that the sheet resistance of this highly electrically conductive film is 1/50 to 1/100 of the sheet resistance of this heating element (Figure 1). .
この発明の実施に当つては発熱体のシート抵抗
を10〜30Ω／□とし、湾曲部に被着された高電気
良導体膜のシート抵抗を0.1〜0.6Ω／□とするの
が好適である。 In carrying out this invention, it is preferable that the sheet resistance of the heating element be 10 to 30 Ω/□, and the sheet resistance of the highly electrically conductive film coated on the curved portion be 0.1 to 0.6 Ω/□.
また、この発明の好適実施例においては、発熱
体にこの発熱体を流れる電流方向に沿う方向に切
欠部を設けることが出来る。 Further, in a preferred embodiment of the present invention, the heating element can be provided with a notch in the direction along the direction of the current flowing through the heating element.
（作用）
第２図及び第３図はこの発明の原理を説明する
ための線図である。(Operation) FIGS. 2 and 3 are diagrams for explaining the principle of this invention.
第２図は二本の針金A1−A2及びB1−B2を図示
のようにミアンダ形状の一部分を真似て成形し、
A1及びB1間を同一電位の0Vとし、かつ、A2及び
B2間を同一電位の10Vとした場合の針金A1−A2
及びB1−B2間での電位分布を示す。C1C2及び
D1D2はそれぞれの円弧部分を示す。 In Figure 2, two wires A 1 -A 2 and B 1 -B 2 are formed to imitate part of the meander shape as shown in the figure.
The same potential is 0V between A 1 and B 1 , and A 2 and
Wire A 1 −A 2 when the same potential of 10V is applied between B 2
and shows the potential distribution between B 1 and B 2 . C 1 C 2 and
D 1 D 2 indicates each arc portion.
この場合、円弧部分C1C2及びD1D2の電気抵抗
がほぼ等しければ、等電位線はA1C1，B1D1，
B2，D2，A2C2間でA1B1及びA2B2と平行となり、
電流集中は生じない。すなわち、円弧部分C1C2
の電気抵抗を下げるモデルを作成出来るならば、
これをミアンダ形状の発熱体の設計に拡張するこ
とが出来る。 In this case, if the electrical resistances of the arc parts C 1 C 2 and D 1 D 2 are almost equal, the equipotential lines are A 1 C 1 , B 1 D 1 ,
B 2 , D 2 , A 2 C 2 are parallel to A 1 B 1 and A 2 B 2 ,
No current concentration occurs. That is, the arc portion C 1 C 2
If we can create a model that lowers the electrical resistance of
This can be extended to the design of meander-shaped heating elements.
そこで円弧C1C2間及びD1D2間の単位長当りの
抵抗値を、A1C1間、B1D1間、A2C2間及びB2D2
間の単位長当りの抵抗値（これらの抵抗値は等し
い）の1/5，1/10，1/50，1/100にそれぞれ設定し
た場合に、対応する各等電位点Ｅ（それぞれE1，
E2，E3，E4とする）を調べたところ、第３図に
示すような結果が得られた。この場合、C1の点
の電位と同一の電位を持つ位置をB1D1上に求め
てＥ点とした。 Therefore, the resistance values per unit length between arcs C 1 C 2 and D 1 D 2 are calculated as follows: A 1 C 1 , B 1 D 1 , A 2 C 2 , and B 2 D 2
When the resistance value per unit length between the two is set to 1/5, 1/10, 1/50, and 1/100, respectively, the corresponding equipotential points E (respectively E 1 ，
E 2 , E 3 , E 4 ) were investigated, and the results shown in Figure 3 were obtained. In this case, a position having the same potential as that of point C 1 was found on B 1 D 1 and designated as point E.
この第３図の結果から、抵抗が1/5及び1/10に
対応する等電位点E1及びE2はD1から離れすぎて
いるが、抵抗が1/50及び1/100に対応する等電位
点E3及びE4はD1に充分接近し電流集中がほとん
ど生じないことが分かる。 From the results in Figure 3, the equipotential points E 1 and E 2 , which correspond to resistances of 1/5 and 1/10, are too far from D 1, but the equipotential points, which correspond to resistances of 1/50 and 1/100, are too far from D 1 . It can be seen that the equipotential points E 3 and E 4 are sufficiently close to D 1 so that almost no current concentration occurs.
ここで、長方形A1B1D1C1及びA2B2C2D2の面
積抵抗（シート抵抗）が20Ω／□であると仮定す
ると、その1/50の値は0.4Ω／□であり、このシ
ート抵抗は金の1480Åに相当する。また、1/100
の値とすると、このシート抵抗は金の2960Åに相
当する。また1/5，1/10の値は各々148Å，296Å
に相当する。 Here, assuming that the sheet resistance (sheet resistance) of rectangles A 1 B 1 D 1 C 1 and A 2 B 2 C 2 D 2 is 20Ω/□, the value of 1/50 is 0.4Ω/□. This sheet resistance is equivalent to 1480 Å of gold. Also, 1/100
Assuming the value of , this sheet resistance corresponds to 2960 Å of gold. Also, the values of 1/5 and 1/10 are 148 Å and 296 Å, respectively.
corresponds to
この結果から、金Auのような電気良導体膜を
用いて抵抗値を下げる場合には、その厚まを1500
Å〜約3000Å程度とすれば充分に電流集中を防ぐ
ことが出来、しかも、この厚みが導電層１４の厚
みに比べて約1/10程度となり、この程度の厚み
（約1500Å〜約3000Å）であれば発熱体の直線部
の大さ（通常250μm程度）に比して十分小さいも
のであるため、発熱体の直線部の表面からほとん
ど突出していないと見なせる。このように、金そ
の他の電気良導体膜をミアンダ形状の発熱体の湾
曲部に被着させることにより、電流集中の回避と
感熱紙との発熱部との接触も従来よりも良好とな
ることが期待出来る。 From this result, when using a good electrical conductor film such as gold Au to lower the resistance value, the thickness should be 1500 mm.
A thickness of approximately 3000 Å to approximately 3000 Å can sufficiently prevent current concentration, and this thickness is approximately 1/10 of the thickness of the conductive layer 14. If there is, it is sufficiently small compared to the size of the straight part of the heating element (usually about 250 μm), so it can be considered that it hardly protrudes from the surface of the straight part of the heating element. By applying gold or other electrically conductive film to the curved part of the meander-shaped heating element, it is expected that current concentration will be avoided and the contact between the heat-sensitive paper and the heating element will be better than before. I can do it.
（実施例）
以下、図面を参照してこの発明の実施例につき
説明する。尚、これら図において、第１図に示し
た構成成分と同一の構成成分については同一の符
号を付して示す。(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings. In these figures, the same components as those shown in FIG. 1 are denoted by the same reference numerals.
先ず、第１図に示すように、従来構造と類似す
るが、この発明の場合には発熱体１０の湾曲部１
８にこの発熱体１０のシート抵抗の1/50以下のシ
ート抵抗を有する高電気良導体膜２０（図中、斜
線を付して示してある）を被着する。この場合、
１／５０〜1/100のシート抵抗としたのは、電気良導
体材料として金を用いると、厚みを電極層１４の
厚みのほぼ1/10程度にすることが出来、発熱部１
６と感熱紙との良好な接触を損なわずに湾曲部１
８での電流集中を回避することが出来るからであ
る。 First, as shown in FIG. 1, although the structure is similar to the conventional structure, in the case of the present invention, the curved portion 1 of the heating element 10 is
A highly electrically conductive film 20 (shown with diagonal lines in the figure) having a sheet resistance of 1/50 or less of the sheet resistance of the heating element 10 is applied to the heating element 8 . in this case,
The reason why the sheet resistance is 1/50 to 1/100 is that if gold is used as a good electrical conductor material, the thickness can be reduced to approximately 1/10 of the thickness of the electrode layer 14.
6 and the curved part 1 without compromising good contact with the thermal paper.
This is because current concentration at 8 can be avoided.
この場合、発熱体のシート抵抗を10〜30Ω／□
とし、被着する電気良導体膜２０ののシート抵抗
を0.1〜0.6Ω／□とするのが好適である。しかし
ながら、これらの値は設計に応じて任意に設定す
ることが出来る。 In this case, set the sheet resistance of the heating element to 10 to 30Ω/□
It is preferable that the sheet resistance of the electrically conductive film 20 to be deposited is 0.1 to 0.6 Ω/□. However, these values can be arbitrarily set depending on the design.
第４図はこの発明の他の実施例を概略的に示す
線図である。この実施例では、発熱部１６は一般
に熱歪が生じやすいので、発熱部１６の発熱体１
０の部分に切欠部２２を設け、この部分での熱歪
をこの切欠部２２で吸収出来るような構造となし
ている。この場合、通常は切欠部２２の形状はス
リツト状の細溝としその長手方向を発熱体１０を
流れる電流の方向に沿つた方向に向けて形成す
る。これら切欠部２２はミアンダ形状の直線部１
６に一個又は二個以上設けることが出来る。この
直線部１６が給電体１２と連なつている部分では
この給電体１２の一部分へと延在させて設けても
良い。 FIG. 4 is a diagram schematically showing another embodiment of the invention. In this embodiment, since the heat generating section 16 is generally prone to thermal strain, the heat generating element 1 of the heat generating section 16 is
A notch 22 is provided at the 0 portion, and the structure is such that thermal strain at this portion can be absorbed by the notch 22. In this case, the notch 22 is usually formed into a slit-like narrow groove with its longitudinal direction oriented along the direction of the current flowing through the heating element 10. These notches 22 are meander-shaped straight parts 1
6 can be provided with one or two or more. In a portion where the straight portion 16 is connected to the power supply body 12, it may be provided so as to extend to a part of the power supply body 12.
第５図はこの発明の他の実施例を略線的に示す
線図である。この実施例は、発熱体１０と同一材
料からなる給電体１２の部分にも上述した高電気
良導体膜と同一の材料の高電気良導体膜２４を被
着した構造を示す。このように構成すれば、この
部分での電力消費を低減出来る。 FIG. 5 is a diagram schematically showing another embodiment of the invention. This embodiment shows a structure in which a highly electrically conductive film 24 made of the same material as the above-mentioned highly electrically conductive film is also coated on a portion of the power supply body 12 made of the same material as the heating element 10. With this configuration, power consumption in this part can be reduced.
（発明の効果）
上述した説明からも明らかなように、この発明
のサーマルヘツドによれば、ミアンダ発熱体の湾
曲部に薄い電気良導体膜を被着したので、この湾
曲部に電流の集中が起らないと共に、この電気良
導体膜が電極層の厚さに対して1/10程度の厚さ
で、直線部からほとんど突出しないとみなせるの
で、発熱部を感熱紙と接触させる場合に両者間の
接触は従来よりも良好に行い得るという利点があ
る。(Effects of the Invention) As is clear from the above explanation, according to the thermal head of the present invention, a thin electrically conductive film is applied to the curved portion of the meandering heating element, so that current concentration occurs in this curved portion. In addition, this electrically conductive film is about 1/10th the thickness of the electrode layer and can be considered to hardly protrude from the straight part, so when the heat generating part is brought into contact with thermal paper, there is no contact between the two. It has the advantage that it can be performed better than before.
第１図はこの発明の一実施例及び従来のサーマ
ルヘツドの説明に供する概略図、第２図及び第３
図はこの発明の説明に供する等電位線を示す線
図、第４図及び第５図はこの発明の他の実施例を
概略的に示す線図である。第６図は従来構造の説
明図である。
１０……発熱体、１２……給電体、１４……電
極層、１６……発熱部（又は直線部）、１８……
湾曲部（又はコーナ部或いは蛇行部分）、２０…
…高電気良導体膜、２２……切欠部。
FIG. 1 is a schematic diagram for explaining an embodiment of the present invention and a conventional thermal head, and FIGS.
The figure is a diagram showing equipotential lines for explaining the present invention, and FIGS. 4 and 5 are diagrams schematically showing other embodiments of the invention. FIG. 6 is an explanatory diagram of a conventional structure. 10...Heating element, 12...Power supply body, 14...Electrode layer, 16...Heating part (or linear part), 18...
Curved portion (or corner portion or meandering portion), 20...
... Highly electrically conductive film, 22 ... Notch.
Claims (1)
給電体とを有するサーマルヘツドにおいて、 該発熱体の感熱紙と当接する側であつてミアン
ダ形状の湾曲部に被着された高電気良導体膜を有
し、 該高電気良導体膜のシート抵抗を前記発熱体の
シート抵抗の1/50〜1/100としたことを特徴とす
るサーマルヘツド。 ２ 発熱体のシート抵抗を10〜30Ω／□とし、湾
曲部に被着された高電気良導体膜のシート抵抗を
0.1〜0.6Ω／□としたことを特徴とする特許請求
の範囲第１項記載のサーマルヘツド。 ３ 発熱体が該発熱体を流れる電流方向に沿う方
向に切欠部を有することを特徴とする特許請求の
範囲第１項記載のサーマルヘツド。[Scope of Claims] 1. In a thermal head having a meander-shaped heating element and a power supply connected to the heating element, a thermal head that is attached to a meander-shaped curved part on the side of the heating element that comes into contact with thermal paper. 1. A thermal head comprising a highly electrically conductive film having a sheet resistance of 1/50 to 1/100 of the sheet resistance of the heating element. 2 The sheet resistance of the heating element is 10 to 30Ω/□, and the sheet resistance of the highly electrically conductive film attached to the curved part is
The thermal head according to claim 1, characterized in that the resistance is 0.1 to 0.6 Ω/□. 3. The thermal head according to claim 1, wherein the heating element has a notch in a direction along the direction of current flowing through the heating element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60028819A JPS61188162A (en) | 1985-02-16 | 1985-02-16 | Thermal head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60028819A JPS61188162A (en) | 1985-02-16 | 1985-02-16 | Thermal head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61188162A JPS61188162A (en) | 1986-08-21 |
| JPH0481514B2 true JPH0481514B2 (en) | 1992-12-24 |
Family
ID=12259008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60028819A Granted JPS61188162A (en) | 1985-02-16 | 1985-02-16 | Thermal head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61188162A (en) |
-
1985
- 1985-02-16 JP JP60028819A patent/JPS61188162A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61188162A (en) | 1986-08-21 |
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| Publication | Publication Date | Title |
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