JPH04147869A - Thermal head - Google Patents
Thermal headInfo
- Publication number
- JPH04147869A JPH04147869A JP27307490A JP27307490A JPH04147869A JP H04147869 A JPH04147869 A JP H04147869A JP 27307490 A JP27307490 A JP 27307490A JP 27307490 A JP27307490 A JP 27307490A JP H04147869 A JPH04147869 A JP H04147869A
- Authority
- JP
- Japan
- Prior art keywords
- protective layer
- layer
- heat
- thermal head
- heat generating
- 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.)
- Pending
Links
- 239000011241 protective layer Substances 0.000 claims abstract description 41
- 239000010410 layer Substances 0.000 claims abstract description 35
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 238000005338 heat storage Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 abstract description 28
- 238000009825 accumulation Methods 0.000 abstract 3
- 239000000463 material Substances 0.000 description 6
- 238000004544 sputter deposition Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 3
- 238000000206 photolithography Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 229910004479 Ta2N Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- -1 All Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Electronic Switches (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、サーマルプリンタに搭載され、印字情報に従
って発熱素子を選択的に通電加熱することにより所望の
印字を行なうサーマルヘッドに係り、特に、その印字寿
命の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thermal head that is installed in a thermal printer and performs desired printing by selectively energizing and heating heating elements according to printing information, and in particular, Regarding improvement of its printing life.
一般に、サーマルプリンタに搭載されるサーマルヘッド
は、例えば、複数の発熱素子を絶縁性を有する基板上に
直線的に整列配置し、印字情報に従って前記各発熱素子
を選択的に通電加熱させることにより、感熱プリンタに
おいては感熱記録紙に発色記録させるようにして、また
、熱転写プリンタにおいてはインクリボンのインクを溶
融して普通紙に転写記録するようにして印字を行なうよ
うになっている。In general, a thermal head mounted on a thermal printer, for example, arranges a plurality of heating elements linearly on an insulating substrate, and selectively heats each heating element with electricity according to printed information. Thermal printers perform color recording on thermal recording paper, while thermal transfer printers perform printing by melting ink on an ink ribbon and transferring and recording onto plain paper.
第３図は従来のこの種のサーマルヘッドの一般構造を示
すものであり、アルミナ等の絶縁性材料により構成され
ている基板１の上面には、蓄熱層として機能するガラス
からなるグレーズ層２がほぼ４０μｍの厚さで形成され
ており、このグレーズＷ２の上面の発熱素子３の形成予
定領域には、印字における熱効率を高めるため縦断面は
ぼ台形状の突起２ａが、フォトリソグラフィ技術により
ほぼ１０μｍの高さに形成されている。FIG. 3 shows the general structure of a conventional thermal head of this type. On the upper surface of a substrate 1 made of an insulating material such as alumina, a glaze layer 2 made of glass that functions as a heat storage layer is provided. The glaze W2 is formed with a thickness of approximately 40 μm, and in the area where the heating element 3 is planned to be formed on the upper surface of the glaze W2, a protrusion 2a having a trapezoidal vertical section is formed with a thickness of approximately 10 μm using photolithography technology in order to increase thermal efficiency in printing. It is formed at a height of
前記グレーズＩ！２の平面部２ｂから突起２ａにかけて
は、Ｔａ２Ｎ、Ｔａ−８ｉ Ｏ２等の発熱抵抗材料から
なる複数の発熱素子３が、蒸着、スパッタリング等によ
り層状に被着された後にエツチングを行なうことにより
直線状に整列して形成されている。Said Glaze I! From the flat part 2b of 2 to the protrusion 2a, a plurality of heating elements 3 made of a heating resistance material such as Ta2N, Ta-8iO2, etc. are deposited in a layered manner by vapor deposition, sputtering, etc., and then etched to form a linear shape. It is formed by aligning with.
前記突起２ａの両側面の下部より下方のグレーズ層２上
には、突起２ａの頂部２Ｃ上における各発熱素子３の両
側に位置し各発熱素子３に対して給電するための共通電
極４ａおよび個別電極４ｂがそれぞれ形成されており、
これらの各電極４ａ。On the glaze layer 2 below the lower portions of both sides of the protrusion 2a, there are common electrodes 4a and individual electrodes located on both sides of each heating element 3 on the top 2C of the protrusion 2a for supplying power to each heating element 3. Electrodes 4b are formed respectively,
Each of these electrodes 4a.
４ｂは、例えば、Ａｌｌ 、Ｃｕ 、Ａｕ等の軟質金属
により形成されており、蒸着、スパッタリング等により
所望形状のパターンに形成されている。4b is made of a soft metal such as All, Cu, or Au, and is formed into a desired pattern by vapor deposition, sputtering, or the like.
そして、前記各発熱素子３は、前記共通電極４ａおよび
個別電極４ｂ間となる突起２ａの頂部２Ｃ上に、最小印
字単位たる゛１ドツト相当分の発熱部３ａを露出するよ
うにして各個独立に形成され、この発熱素子３の発熱部
３ａは、前記各電極４ａ、４ｂ間に電圧を印加すること
により発熱されるようになっている。Each of the heating elements 3 is arranged independently so that the heating portion 3a corresponding to one dot, which is the minimum printing unit, is exposed on the top 2C of the protrusion 2a between the common electrode 4a and the individual electrodes 4b. The heat generating portion 3a of the heat generating element 3 is configured to generate heat by applying a voltage between the electrodes 4a and 4b.
前記発熱素子３、電極４ａ、４ｂならびにグレーズ層２
の上面には、これらの発熱素子３および電極４ａ、４ｂ
を保護するとともに、印字熱効率を高めるために４〜６
μｍの等しい膜厚の保護層５が主に窒化シリコン系の材
料により形成されている。この保護層５は、発熱素子３
を酸化による劣化から保護するとともに、インクリボン
等との接触による発熱素子３の摩耗を保護する機能を単
層で有するものとなっており、前記各電極４ａ。The heating element 3, electrodes 4a, 4b, and glaze layer 2
These heating elements 3 and electrodes 4a, 4b are placed on the top surface of the
4 to 6 to protect the printer and increase printing thermal efficiency.
A protective layer 5 having an equal thickness of μm is mainly formed of a silicon nitride-based material. This protective layer 5 covers the heating element 3
Each electrode 4a has a single layer function of protecting the heating element 3 from deterioration due to oxidation and protecting the heating element 3 from wear due to contact with an ink ribbon or the like.
４ｂの端子部以外の表面のすべてを被覆するようになっ
ている。この保１１８５はスパッタリング等の手段によ
り積層され、その後最終工程において前記絶縁性基板を
分割して、所望のサーマルへラドチップを得るようにな
っている。The entire surface of 4b other than the terminal portion is coated. This insulation board 1185 is laminated by means such as sputtering, and then in the final step, the insulating substrate is divided to obtain desired thermal Rad chips.
前述した従来のサーマルヘッドを使用する熱転写プリン
タにおいては、このサーマルヘッドをインクリボンを介
して用紙に圧接させ、所定の印字情報に基づいて所望の
発熱部３ａに対応する個別電極４ｂに通電することによ
り、その発熱素子３を発熱させ、前記インクリボンのイ
ンクを部分的に前記用紙に溶融転写させて、前記用紙上
に所望の印字を行なうことができる。また、同様に各発
熱部３ａを選択的に発熱させることにより直接感熱記録
紙に対しても所望の印字を行うことができる。In the thermal transfer printer using the conventional thermal head described above, the thermal head is brought into pressure contact with the paper via the ink ribbon, and the individual electrodes 4b corresponding to the desired heat generating parts 3a are energized based on predetermined print information. As a result, the heating element 3 generates heat, the ink of the ink ribbon is partially melted and transferred onto the paper, and desired printing can be performed on the paper. Similarly, desired printing can also be performed directly on thermosensitive recording paper by selectively generating heat in each heat generating section 3a.
しかしながら、前述した従来のサーマルヘッドにおいて
は、前記発熱素子３の発熱部３ａが、グレーズ層２に設
けた断面台形状の突起２ａ上に配設され、その突起２ａ
の高さＡに対し保護１ｉ５の厚さＢをＡ ８として、発
熱素子３の発熱部３ａがインクリボン等に圧接しやすく
するとともに、保護層５を薄くして発熱部３ａの発熱に
よる熱エネルギをインクリボンに伝達しやすくし、印字
における熱効率を著しく高めるようにしている。However, in the conventional thermal head described above, the heat generating portion 3a of the heat generating element 3 is disposed on the protrusion 2a provided in the glaze layer 2 and having a trapezoidal cross section.
The thickness B of the protection 1i5 is set to A8 for the height A of the heat generating element 3, so that the heat generating part 3a of the heat generating element 3 can be easily pressed against the ink ribbon, etc., and the protective layer 5 is made thinner to reduce the thermal energy generated by the heat generated by the heat generating part 3a. This makes it easier to transfer heat to the ink ribbon, significantly increasing the thermal efficiency of printing.
近年、サーマルプリンタの発達にともない、各種グレー
ドのインクリボンや感熱記録紙といった感熱記録部材が
市販されているが、これらの感熱記録部材に前記サーマ
ルヘッドを圧接して印字したとき、感熱記録部材のなか
でも特に感熱紙の中に保護層５を強く摩耗させるものが
多くあり、このためサーマルヘッドが破壊され所望の印
字寿命が得られないケースが続出していた。このため、
保護層５の耐摩耗性の向上が研究されているが、発熱部
３ａが突出して、発熱部３ａ上の保護Ｉ５に集中荷重が
生じているため、単純に材料だけさらに耐摩耗性のある
ものに変更しても、解決しきれないという問題点を有し
ている。In recent years, with the development of thermal printers, various grades of thermal recording materials such as ink ribbons and thermal recording paper have become commercially available. In particular, there are many types of thermal paper that strongly abrade the protective layer 5, resulting in a series of cases in which the thermal head is destroyed and the desired printing life cannot be obtained. For this reason,
Research has been conducted to improve the abrasion resistance of the protective layer 5, but since the heat generating part 3a protrudes and a concentrated load is generated on the protection I5 above the heat generating part 3a, it is difficult to simply improve the wear resistance of the material. Even if it is changed to , the problem cannot be solved completely.
本発明は、前述した従来のものにおける問題点を克服し
、良好な印字品質を雑持し、かつ寿命の長いサーマルヘ
ッドを提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a thermal head that overcomes the above-mentioned problems of the prior art, exhibits good print quality, and has a long life.
前述した目的を達成するため本発明のサーマルヘッドは
、基板上に、部分的な突起を有する蓄熱層を積層し、こ
の蓄熱層上に複数の発熱素子を、それぞれの発熱部が前
記突起上に位置しかつ各発熱素子に選択的に通電可能と
なるように形成するとともに、前記蓄熱層および各発熱
素子上を保護層により被覆してなるサーマルヘッドにお
いて、前記蓄熱層の突起以外の部位を被覆する前記保護
層の表面を前記蓄熱層の突起より上位となるように形成
したことを特徴としている。In order to achieve the above-mentioned object, the thermal head of the present invention has a heat storage layer having partial protrusions laminated on a substrate, a plurality of heat generating elements on the heat storage layer, and respective heat generating parts on the protrusions. In the thermal head, the heat storage layer and each heat generation element are covered with a protective layer, and the heat storage layer and each heat generation element are covered with a protective layer. It is characterized in that the surface of the protective layer is formed above the protrusions of the heat storage layer.
前述した構成からなる本発明のサーマルヘッドによれば
、例えば、摩耗性の大なる感熱配録部材を用いて印字を
行なった場合、蓄熱層の突起上の保護層は、局部的に突
出して集中荷重が作用するため、摩耗が急速に進み、こ
の突起上の保護層の厚さは短期のうちに薄くなる。しか
しながら、突起上の保！！層の厚さが薄くなって他の部
位の保護層とほぼ等高になると、感熱記録部材に対する
保護層の接触面積が著しく大きくなるため、突起上の保
護層への局部的な集中荷重がなくなり、この部位の保１
１層の摩耗は急速に軽減され、その後は、印字距離に対
する摩耗量が著しく減少し、サーマルヘッドの破壊には
直ちには至らないものとなる。According to the thermal head of the present invention having the above-described configuration, for example, when printing is performed using a highly abrasive heat-sensitive recording member, the protective layer on the projections of the heat storage layer protrudes locally and concentrates. Due to the load acting on it, wear progresses rapidly and the thickness of the protective layer on this protrusion becomes thinner in a short period of time. However, the protection on the protrusion! ! When the thickness of the layer becomes thinner and becomes almost the same height as the protective layer in other parts, the contact area of the protective layer with the heat-sensitive recording member becomes significantly larger, so there is no longer a locally concentrated load on the protective layer on the protrusion. , the maintenance of this part1
The wear of one layer is rapidly reduced, and thereafter the amount of wear relative to the printing distance is significantly reduced, and the thermal head does not immediately break down.
また、印字品質上からみると、発熱素子を電極より突出
して設けることは絶対条件であり突出の有無にお１ブる
印字濃度差は顕著なものがある。このため前記突起の＾
さは高いほどよいが、本発明の構成によれば、突起の高
さを高くすればするほど保ＩＩＩの厚さも厚くしなけれ
ばならない。ところが、保護層の厚さが増すと、保護層
における熱損失が大きくなるため、突起の高さはあまり
高くない方がよい。そして、このような構成によれば、
印字品質を低下させることなく、印字寿命を所望のレベ
ルにまで引上げることができる。Furthermore, from the point of view of print quality, it is an absolute requirement that the heating element be provided so as to protrude from the electrode, and there is a significant difference in print density depending on whether or not the heat generating element is protruded. For this reason, the protrusion ^
The higher the height, the better; however, according to the configuration of the present invention, the higher the height of the protrusion, the thicker the barrier III must be. However, as the thickness of the protective layer increases, heat loss in the protective layer increases, so the height of the protrusions should not be too high. And according to this configuration,
Print life can be increased to a desired level without reducing print quality.
以下、本発明を図面に示す実施例により説明する。なお
、前述した従来のものと同一ないしは相当する構成につ
いては、図面中に同一の符号を付して説明する。The present invention will be explained below with reference to embodiments shown in the drawings. It should be noted that structures that are the same as or correspond to those of the conventional structure described above will be described with the same reference numerals in the drawings.
第１図は本発明に係るサーマルヘッドの実施例を示すも
のである。第１図において、１はアルミナなどの絶縁性
材料からなる基板であり、この基板１上には、ガラスか
らなる蓄熱層たるグレーズｌｉ２が積層されている。こ
のグレーズ層２はその上面を平面に形成されており、こ
の上面の発熱素子３の形成予定領域には、フォトリソグ
ラフィ技術により頂部２Ｃを平面とした縦断面はぼ台形
状の突起２ａが一体に形成されている。この突起２ａの
高さは、最大はぼ５μｍ程度に設定することが望ましい
。FIG. 1 shows an embodiment of a thermal head according to the present invention. In FIG. 1, reference numeral 1 denotes a substrate made of an insulating material such as alumina, and on this substrate 1 is laminated a glaze li2 which is a heat storage layer made of glass. This glaze layer 2 has a flat top surface, and a projection 2a having a trapezoidal vertical section with a top portion 2C as a flat surface is integrally formed on the top surface in an area where the heating element 3 is to be formed by photolithography. It is formed. The height of this protrusion 2a is desirably set to approximately 5 μm at maximum.
前記グレーズ層２上には、Ｔａ２ＮまたはＴａＳ ｉ
０２等からなる発熱素子３の材料ならびにＡＩ等からな
る電極の材料をスパッタリング等によりほぼ２μｍの厚
さとなるように積層し、フォトリソグラフィ技術により
パターニングすることにより、整列配置された複数の発
熱素子３が、それぞれの発熱部３ａがグレーズ［１２の
突起２ａ上に位置するように形成されるとともに、各発
熱素子３に対応する共通電極４ａおよび個別電極４ｂが
グレーズ層２の平面部２ｂ上の各発熱素子３上に形成さ
れる。そして、これらの各発熱素子３、共通電極４ａ、
個別電極４ｂならびに露出しているグレーズ層２上には
、窒化シリコン系からなる保護層１５が、最大はぼ５μ
ｍ程度の厚さとなるようにスパッタリング等により積層
されている。On the glaze layer 2, Ta2N or TaSi
A plurality of aligned heating elements 3 are formed by laminating the material of the heating element 3 made of 02 or the like and the material of the electrode made of AI or the like to a thickness of approximately 2 μm by sputtering or the like, and patterning it by photolithography. The respective heat generating parts 3a are formed so as to be located on the protrusions 2a of the glaze [12], and the common electrode 4a and individual electrodes 4b corresponding to each heat generating element 3 are formed so as to be located on the flat part 2b of the glaze layer 2. It is formed on the heating element 3. Each of these heating elements 3, common electrode 4a,
On the individual electrodes 4b and the exposed glaze layer 2, a protective layer 15 made of silicon nitride is coated with a maximum thickness of approximately 5 μm.
The layers are laminated by sputtering or the like so that the thickness is approximately 1.5 m.
このような構成のサーマルヘッドについて摩耗性の大な
る感熱紙を用いて印字耐久テストを行なうと、第２図に
示すように、印字距離に対するグレーズ層２の突起２ａ
上の保護層５の摩耗カーブは、印字開始時においてはグ
レーズ１１２の突起２ａ上の保護層５が他の部位の保護
層５より突出しているので、このグレーズ１！２の突起
２ａ上の保護層５は他の部位より突出しなくなるａ点ま
で急速に先行摩耗することになる。しかしながら、グレ
ーズＩ！２の突起２ａ上の保護層５が摩耗して他の部位
の保護層５にも摩耗痕が発生するようになるａ点以後に
おいては、グレーズ層２の突起２ａ上すなわち発熱素子
３の発熱部３ａ上の保護層５の摩耗が急激に軽減される
ことになる。When a printing durability test was conducted on a thermal head having such a configuration using highly abrasive thermal paper, as shown in FIG. 2, the projections 2a of the glaze layer 2 were
The abrasion curve of the upper protective layer 5 is such that at the start of printing, the protective layer 5 on the protrusions 2a of the glaze 112 protrudes from other parts of the protective layer 5. The layer 5 rapidly wears out in advance up to a point a where it no longer protrudes from other parts. However, Glaze I! After point a, when the protective layer 5 on the protrusion 2a of the glaze layer 2 is worn out and wear marks are generated on the protective layer 5 in other parts, the heat generating part of the heat generating element 3 is Abrasion of the protective layer 5 on the protective layer 3a is rapidly reduced.
ところで、本実施例のサーマルヘッドにおいては、グレ
ーズ層２の突、起２ａの高さＡと保護層５の厚さＢとが
Ａ≦Ｂを満たしているが、グレーズ層２の突起２ａ上の
保護層５の突部が先行摩耗して、グレーズ１！２の平面
部２ｂ上の保１１８５にまで広く感熱記録部材（図示せ
ず）が接触するようになったところでは共通電極４ａお
よび個別電極４ｂの厚さがほぼ２μｍあるため、第１図
に想像線で示すように、発熱素子３の発熱部３ａ上の保
護層５の厚さはほぼ２μｍ残存していることになる。し
たがってこの時点から、発熱部３ａ上の保護層５の摩耗
スピードは著しく低下することになるので、はぼ２μ瓦
の厚さの保護層５であっても所望の印字耐久寿命を有す
るようになる。By the way, in the thermal head of this embodiment, the height A of the protrusions 2a of the glaze layer 2 and the thickness B of the protective layer 5 satisfy A≦B. When the protrusions of the protective layer 5 wear out in advance and the heat-sensitive recording member (not shown) comes into contact with the retainer 1185 on the flat part 2b of the glaze 1!2, the common electrode 4a and the individual electrodes Since the thickness of the protective layer 4b is approximately 2 μm, the thickness of the protective layer 5 on the heat generating portion 3a of the heat generating element 3 remains approximately 2 μm, as shown by the imaginary line in FIG. Therefore, from this point on, the wear speed of the protective layer 5 on the heat generating part 3a will drop significantly, so that even the protective layer 5 with a thickness of approximately 2 μm will have the desired printing durability life. .
また、印字品質についてみると、印字開始の初期におい
ては、はぼ５μｍの保護層５の突部が十分に感熱記録部
材と接触しているので良好な印字品質が得られる。とこ
ろで、印字が進むことによって保１１Ｊｉ５の突部が摩
耗し、感熱記録部材に対する接触状態が次第に悪化する
が、同時に保護層５の厚さも薄くなり、発熱素子３の発
熱部３ａにおいて発生した熱が感熱記録媒体に良好に伝
熱しやすくなり、感熱配録部材との接触性も保護層５の
摩耗とともに良好となるので、印字品質の劣化はほとん
ど見られることなく、良好な印字品質を保持して、印字
耐久寿命を著しく向上したものとすることが−できる。Regarding print quality, at the beginning of printing, the protrusions of the protective layer 5 having a diameter of approximately 5 μm are in sufficient contact with the heat-sensitive recording member, so that good print quality can be obtained. By the way, as printing progresses, the protrusion of the retainer 11Ji5 wears out, and the contact condition with the heat-sensitive recording member gradually deteriorates, but at the same time, the thickness of the protective layer 5 becomes thinner, and the heat generated in the heat generating part 3a of the heat generating element 3 is reduced. Heat is easily transferred to the heat-sensitive recording medium, and the contact with the heat-sensitive recording member also improves as the protective layer 5 wears out, so there is almost no deterioration in print quality and good print quality is maintained. , the durability of printing can be significantly improved.
なお、本発明は、前述した実施例に限定されるものでは
なく、必要に応じて種々の変更が可能である。Note that the present invention is not limited to the embodiments described above, and various changes can be made as necessary.
以上説明したように本発明に係るサーマルヘッドによれ
ば、良好な印字品質を維持し、かつ寿命を長くできると
いう優れた効果を奏することができる。As explained above, according to the thermal head according to the present invention, it is possible to achieve excellent effects of maintaining good printing quality and extending the life.
第１図は本発明に係るサーマルヘッドの実施例を示す縦
断面図、第２図は第１図のサーマルヘッドの摩耗量の推
移を示すグラフ、第３図は従来のサーマルヘッドを示す
縦断面図である。
１・・・基板、２・・・グレーズ層、２ａ・・・突起、
３・・・発熱素子、３ａ・・・発熱部、４ａ・・・共通
電極、４ｂ・・・個別電極、５・・・保護層。
第１図
第２図
第３図Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the thermal head according to the present invention, Fig. 2 is a graph showing the change in wear amount of the thermal head shown in Fig. 1, and Fig. 3 is a longitudinal cross-sectional view showing a conventional thermal head. It is a diagram. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Glaze layer, 2a... Protrusion,
3... Heat generating element, 3a... Heat generating portion, 4a... Common electrode, 4b... Individual electrode, 5... Protective layer. Figure 1 Figure 2 Figure 3
Claims (1)
蓄熱層上に複数の発熱素子を、それぞれの発熱部が前記
突起上に位置しかつ各発熱素子に選択的に通電可能とな
るように形成するとともに、前記蓄熱層および各発熱素
子上を保護層により被覆してなるサーマルヘッドにおい
て、前記蓄熱層の突起以外の部位を被覆する前記保護層
の表面を前記蓄熱層の突起より上位となるように形成し
たことを特徴とするサーマルヘッドヘッド。A heat storage layer having partial protrusions is laminated on a substrate, and a plurality of heat generating elements are placed on this heat storage layer, each heat generating part is located on the protrusion, and each heat generating element can be selectively energized. In the thermal head, the heat storage layer and each heat generating element are covered with a protective layer, in which the surface of the protective layer covering parts other than the protrusions of the heat storage layer is above the protrusions of the heat storage layer. A thermal head characterized by being formed to have the following characteristics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27307490A JPH04147869A (en) | 1990-10-11 | 1990-10-11 | Thermal head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27307490A JPH04147869A (en) | 1990-10-11 | 1990-10-11 | Thermal head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04147869A true JPH04147869A (en) | 1992-05-21 |
Family
ID=17522784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27307490A Pending JPH04147869A (en) | 1990-10-11 | 1990-10-11 | Thermal head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04147869A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012171288A (en) * | 2011-02-23 | 2012-09-10 | Seiko Instruments Inc | Thermal head and method for manufacturing the same, and printer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52152725A (en) * | 1976-06-14 | 1977-12-19 | Matsushita Electric Ind Co Ltd | Printing exothermic element |
| JPS56161177A (en) * | 1980-05-16 | 1981-12-11 | Hitachi Ltd | Thermosensitive recording head |
| JPS57208270A (en) * | 1981-06-19 | 1982-12-21 | Hitachi Ltd | Heat sensitive recording head |
| JPS5919178A (en) * | 1982-07-22 | 1984-01-31 | Alps Electric Co Ltd | Thermal head |
| JPS60257256A (en) * | 1984-06-04 | 1985-12-19 | Hitachi Ltd | Thermal recording head |
-
1990
- 1990-10-11 JP JP27307490A patent/JPH04147869A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52152725A (en) * | 1976-06-14 | 1977-12-19 | Matsushita Electric Ind Co Ltd | Printing exothermic element |
| JPS56161177A (en) * | 1980-05-16 | 1981-12-11 | Hitachi Ltd | Thermosensitive recording head |
| JPS57208270A (en) * | 1981-06-19 | 1982-12-21 | Hitachi Ltd | Heat sensitive recording head |
| JPS5919178A (en) * | 1982-07-22 | 1984-01-31 | Alps Electric Co Ltd | Thermal head |
| JPS60257256A (en) * | 1984-06-04 | 1985-12-19 | Hitachi Ltd | Thermal recording head |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012171288A (en) * | 2011-02-23 | 2012-09-10 | Seiko Instruments Inc | Thermal head and method for manufacturing the same, and printer |
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