JP2535864B2 - Thermal head - Google Patents
Thermal headInfo
- Publication number
- JP2535864B2 JP2535864B2 JP62026579A JP2657987A JP2535864B2 JP 2535864 B2 JP2535864 B2 JP 2535864B2 JP 62026579 A JP62026579 A JP 62026579A JP 2657987 A JP2657987 A JP 2657987A JP 2535864 B2 JP2535864 B2 JP 2535864B2
- Authority
- JP
- Japan
- Prior art keywords
- protective film
- heating resistor
- film
- conductive
- thermal head
- 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
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
- B41J2/335—Structure of thermal heads
Landscapes
- Electronic Switches (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の保護膜上の帯電防止に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to prevention of static charge on a protective film of a thermal head.
近年、フアクシミリ，プリンター用の印字デバイスと
して、サーマルヘツドが使用されている。一般にサーマ
ルヘツドは絶縁基板上に発熱抵抗体を形成し該発熱抵抗
体に通電し発熱させることにより感熱記録紙上に数字・
文字・記号等を記録したりあるいは、発熱抵抗体を発熱
させ、インクフイルムに押しつけることによつてインク
を熱溶解させて受像紙上に数字・文字・記号等を転写し
記録したりするデバイスである。In recent years, thermal heads have been used as printing devices for fax machines and printers. Generally, a thermal head has a heating resistor formed on an insulating substrate, and the heating resistor is energized to generate heat, so that the numbers on the thermal recording paper are
It is a device that records characters, symbols, etc., or heats a heating resistor and presses it against the ink film to melt the ink heat and transfer numbers, characters, symbols, etc. onto the image receiving paper and record them. .
さて、第２図に示すものは、特開昭60−219073号公報
に示されたこの種のサーマルヘツドを示す断面図であ
り、（１）はセラミツク等の絶縁材料からなる基板、
（２）はその表面に形成されたグレーズ層である。そし
てこのグレーズ層（２）の表面に金等の導電材料からな
るリード（３）を所定の間隔を置いて設置する。このリ
ード（３）をまたぐように発熱抵抗体（４）を帯状に形
成する。普通は抵抗ペーストを印刷・焼成して形成す
る。発熱抵抗体（４）はこれを横切るリード（３）によ
つて区画される。隣り合う一対のリード（３）間の抵抗
体部分（4A）が１ドツトとして作用を果す。発熱抵抗体
（４）の表面を耐摩耗性の保護膜（５）でコーテイング
する。（６）はインクフイルムで一般にはポリエステル
等の樹脂からなるベースフイルム（７）とその表面に塗
布されているインク（８）とから構成される。（９）は
受像紙、（10）は発熱抵抗体（４）上の保護膜（５）上
に位置し、インクフイルム（６）と受像紙（９）を押圧
させ搬送するプラテンである。対をなすリード（３）間
に通電することにより、その間にある発熱抵抗体部分
（4A）が発熱し、この熱によりインクフイルム（６）上
のインク部分が溶解して受像紙（９）に転写される。第
３図はリード（３）と発熱抵抗体（４）を示す平面図で
ある。FIG. 2 is a sectional view showing this type of thermal head disclosed in Japanese Patent Laid-Open No. 60-219073, (1) shows a substrate made of an insulating material such as ceramic,
(2) is a glaze layer formed on the surface. Then, the leads (3) made of a conductive material such as gold are placed on the surface of the glaze layer (2) at predetermined intervals. The heating resistor (4) is formed in a strip shape so as to straddle the lead (3). It is usually formed by printing and firing a resistance paste. The heating resistor (4) is demarcated by the leads (3) across it. The resistor portion (4A) between the pair of adjacent leads (3) acts as one dot. The surface of the heating resistor (4) is coated with a wear-resistant protective film (5). (6) is an ink film, which is generally composed of a base film (7) made of a resin such as polyester and an ink (8) applied on the surface thereof. Reference numeral (9) is an image receiving paper, and (10) is a platen which is located on the protective film (5) on the heating resistor (4) and presses and conveys the ink film (6) and the image receiving paper (9). By energizing between the pair of leads (3), the heat generating resistor portion (4A) between them generates heat, and this heat melts the ink portion on the ink film (6) to the image receiving paper (9). Transcribed. FIG. 3 is a plan view showing the lead (3) and the heating resistor (4).
さて、プラテン（10）によるインクフイルム（６）と
受像紙（９）との搬送により保護膜（５）とインクフイ
ルム（６）のベースフイルム（７）とが摺接し合い両者
に数KV〜数10KVに及ぶような静電気が発生して帯電す
る。したがつ発熱抵抗体（４）を経由して高圧微小電流
が一時といえども流れた場合にはその部分の発熱抵抗体
（４）は抵抗値の変化を起こし、その結果、発熱抵抗体
（４）は劣化する。By the platen (10) carrying the ink film (6) and the image receiving paper (9), the protective film (5) and the base film (7) of the ink film (6) are brought into sliding contact with each other for several KV to several. Static electricity of up to 10KV is generated and charged. Therefore, when a high-voltage minute current flows through the heat generating resistor (4) even temporarily, the heat generating resistor (4) in that portion changes its resistance value, and as a result, the heat generating resistor (4) 4) deteriorates.
また、発熱抵抗体（４）の通電制御IC等を搭載してい
る場合、通常耐圧は100〜200V程度であるから通電制御I
Cは当然のことながら高電圧パルス印加にて破壊したり
劣化したりする。したがつて保護膜（５）とベースフイ
ルム（７）両者間に発生した静電気が保護膜（５）を通
して発熱抵抗体（４），リード（３）に高電圧パルスと
して印加されない様にすることが必要で、特開昭60−21
9073号公報では静電気による帯電を低下させる目的で保
護膜（５）を導電性のガラスにて構成している。また第
４図（イ）の断面図及び同図（ロ）の平面図に示すのは
特開昭60−38179号公報に示されたもので発熱抵抗体
（４）を形成した基板（１）の周辺に接地用導体（11）
を設けている。In addition, when a heating resistor (4) current control IC is installed, the withstand voltage is usually 100-200V, so the current control I
As a matter of course, C is destroyed or deteriorated by applying a high voltage pulse. Therefore, it is possible to prevent static electricity generated between both the protective film (5) and the base film (7) from being applied as a high voltage pulse to the heating resistor (4) and the lead (3) through the protective film (5). Necessary, JP-A-60-21
In the 9073 publication, the protective film (5) is made of conductive glass for the purpose of reducing electrostatic charge. The cross-sectional view of FIG. 4 (a) and the plan view of FIG. 4 (b) are shown in JP-A-60-38179, and the substrate (1) on which the heating resistor (4) is formed is shown. Grounding conductors around (11)
Is provided.
従来のサーマルヘツドは以上のように使用中に発熱抵
抗体が静電破壊を起す可能性がある問題があつた。As described above, the conventional thermal head has a problem that the heating resistor may cause electrostatic breakdown during use.
この発明は、使用中に、発熱抵抗体の静電破壊が発生
しないサーマルヘツドを得ることを目的とする。An object of the present invention is to obtain a thermal head in which electrostatic breakdown of a heating resistor does not occur during use.
この発明によるサーマルヘツドは、発熱抵抗体上の保
護膜表面に導電性塗料を塗布することにより、保護膜が
極力、帯電しない様に構成したことを特徴とするもので
ある。The thermal head according to the present invention is characterized in that the surface of the protective film on the heating resistor is coated with a conductive paint so that the protective film is prevented from being charged as much as possible.
〔作用〕 この発明におけるサーマルヘツドは、導電性の保護膜
表面となるから、インクフイルムと摺接しても帯電しに
くくなるし、又帯電したとしても充電電圧は従来のよう
に絶縁性の保護膜を使用した場合に比較して十分低くな
り、その結果として静電気が発生しにくくなることか
ら、発熱抵抗体の静電破壊が防止される。[Function] Since the thermal head in the present invention becomes the surface of the conductive protective film, it becomes difficult to be charged even when it comes into sliding contact with the ink film, and even if it is charged, the charging voltage is the same as the conventional insulating protective film. Is sufficiently lower than the case of using, and as a result, static electricity is less likely to be generated, and thus electrostatic breakdown of the heating resistor is prevented.
この発明の実施例を第１図により説明する。（11）は
保護膜（５）の表面に付着させた導電性塗料である。一
般的に導電性塗料は塗料中に導電性充てん材として金属
粉末，金属繊維，カーボンブラツク，カーボンフアイバ
ー等を含有させたものである。また他に、低抵抗処理剤
として無機塩類、高分子電解質のほかオリゴマーから作
られた導電性処理剤等がある。これらのいずれを使用し
ても良い。An embodiment of the present invention will be described with reference to FIG. (11) is a conductive paint adhered to the surface of the protective film (5). Generally, a conductive paint is a paint containing metal powder, metal fibers, carbon black, carbon fiber, etc. as a conductive filler. Besides, as the low resistance treating agent, there are an inorganic salt, a polymer electrolyte, and a conductive treating agent made of an oligomer. Any of these may be used.
この保護膜（５）上に形成させた導電性塗料（11）に
より、保護膜（５）とインクフイルム（６）のベースフ
イルム（７）とが摺接しても、静電気を発生しない様に
している。又帯電しても充電電圧は従来のように絶縁性
の保護膜（５）を使用した場合に比較して十分低くな
る。Even if the protective film (5) and the base film (7) of the ink film (6) are in sliding contact with each other, the conductive paint (11) formed on the protective film (5) does not generate static electricity. There is. Further, even if charged, the charging voltage becomes sufficiently low as compared with the conventional case where the insulating protective film (5) is used.
この結果静電気が発生しにくくなることから、発熱抵
抗体の静電破壊が防止される。As a result, static electricity is less likely to be generated, so that electrostatic breakdown of the heating resistor is prevented.
このメカニズムは、保護膜（５）がガラスペーストの
印刷・焼成により形成されたものにおいては、導電性塗
料（11）膜をその表面に形成させた場合、保護膜（５）
表面にあるガラス粒子間に導電性塗料（11）の導電性成
分が含侵され、導電性塗料（11）膜が一部剥れたとして
も保護膜（５）表面の抵抗は低くなり、結果的に帯電防
止の効果があるものと推定される。This mechanism is that when the protective film (5) is formed by printing and firing glass paste, when the conductive paint (11) film is formed on the surface, the protective film (5)
Even if the conductive component of the conductive paint (11) is impregnated between the glass particles on the surface and the conductive paint (11) film is partly peeled off, the resistance of the surface of the protective film (5) becomes low. It is presumed that there is a static prevention effect.
以上のようにこの発明によれば発熱体上の保護膜表面
に導電性塗料による皮膜を形成したので、保護膜の帯電
による発熱抵抗体の静電破壊は防止でき、したがつて発
熱抵抗体の劣化によるプリント時の濃度ムラを防ぎ、も
つてプリント品質を従来よりも十分向上させることがで
きる効果を奏する。As described above, according to the present invention, since the film made of the conductive paint is formed on the surface of the protective film on the heating element, electrostatic destruction of the heating resistor due to charging of the protective film can be prevented, and therefore, the heating resistor The density unevenness at the time of printing due to deterioration can be prevented, and the print quality can be improved sufficiently as compared with the conventional case.
第１図はこの発明のサーマルヘツドの実施例を示す断面
図、第２図は従来例を示すサーマルヘツド断面図、第３
図は第２図の平面図、第４図は他の従来例を示す実施例
で、第４図（イ）は断面図、第４図（ロ）は平面図であ
る。 図において、（１）は基板、（２）はグレーズ層、
（３）はリード、（４）は発熱抵抗体、（５）は保護
膜、（６）はインクフイルム、（７）はベースフイル
ム、（８）はインク、（９）は受像紙、（10）はプラテ
ン、（11）は導電性塗料 なお各図中の同一符号は同一、又は相当部分を示す。FIG. 1 is a sectional view showing an embodiment of a thermal head of the present invention, FIG. 2 is a thermal head sectional view showing a conventional example, and FIG.
FIG. 4 is a plan view of FIG. 2, FIG. 4 is an embodiment showing another conventional example, FIG. 4 (a) is a sectional view, and FIG. 4 (b) is a plan view. In the figure, (1) is the substrate, (2) is the glaze layer,
(3) is a lead, (4) is a heating resistor, (5) is a protective film, (6) is an ink film, (7) is a base film, (8) is ink, (9) is an image receiving paper, and (10) ) Is a platen, and (11) is a conductive paint. In the drawings, the same reference numerals indicate the same or corresponding portions.
Claims (1)
層と、このグレーズ層上に配置されたリード線と、この
リード線に接続され、上記グレーズ層上に部分的に設け
られた突出状の発熱抵抗体と、この発熱抵抗体及び上記
グレーズ層上に設けられた、上記発熱抵抗体の表面を覆
う、ガラスペーストの印刷及び焼成により形成された絶
縁性の保護膜と、この保護膜の表面に設けられ、導電性
塗料の塗布により形成された導電膜とを備え、上記導電
膜の導電性成分を上記保護膜に含侵させたことを特徴と
するサーマルヘッド。1. A substrate, a glaze layer provided on the substrate, a lead wire arranged on the glaze layer, a protrusion connected to the lead wire and partially provided on the glaze layer. -Shaped heating resistor, an insulating protective film which is provided on the heating resistor and the glaze layer and covers the surface of the heating resistor and which is formed by printing and firing a glass paste, and the protective film. And a conductive film formed on the surface of the conductive film by applying a conductive paint, wherein the protective film is impregnated with a conductive component of the conductive film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62026579A JP2535864B2 (en) | 1987-02-05 | 1987-02-05 | Thermal head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62026579A JP2535864B2 (en) | 1987-02-05 | 1987-02-05 | Thermal head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63193853A JPS63193853A (en) | 1988-08-11 |
| JP2535864B2 true JP2535864B2 (en) | 1996-09-18 |
Family
ID=12197462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62026579A Expired - Lifetime JP2535864B2 (en) | 1987-02-05 | 1987-02-05 | Thermal head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2535864B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1034999A (en) * | 1996-07-23 | 1998-02-10 | Fuji Photo Film Co Ltd | Thermal recorder and recording method |
| JP6431200B2 (en) * | 2015-07-29 | 2018-11-28 | 京セラ株式会社 | Thermal head and thermal printer |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0329920Y2 (en) * | 1984-12-26 | 1991-06-25 | ||
| JPS61293869A (en) * | 1985-06-21 | 1986-12-24 | Konishiroku Photo Ind Co Ltd | Thermal head |
-
1987
- 1987-02-05 JP JP62026579A patent/JP2535864B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63193853A (en) | 1988-08-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |