JPH03187763A - Thermal head - Google Patents
Thermal headInfo
- Publication number
- JPH03187763A JPH03187763A JP32762689A JP32762689A JPH03187763A JP H03187763 A JPH03187763 A JP H03187763A JP 32762689 A JP32762689 A JP 32762689A JP 32762689 A JP32762689 A JP 32762689A JP H03187763 A JPH03187763 A JP H03187763A
- Authority
- JP
- Japan
- Prior art keywords
- thermal head
- printing
- glass glaze
- type
- 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.)
- Pending
Links
- 239000011521 glass Substances 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims abstract description 10
- 230000007423 decrease Effects 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract 1
- 230000020169 heat generation Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 239000010959 steel Substances 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、プリンタ、ファクシミ1人 ビデオプリンタ
等に使用されるサーマルヘッドに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thermal head used in printers, facsimiles, single-person video printers, and the like.
[従来の技術J
従来は例えば、第2図に示すように、基板1上にガラス
グレーズ2が形成され、該ガラスグレーズと基板の境界
上に厚膜印刷による導電性膜3が形成されサーマルヘッ
ドが知られていた。 (以下bタイプ)また、第・3図
に示すように、基板1の一端に面取り部4を設け、該面
取り部近傍に厚膜印刷によって導電性膜3を形成し、更
に導電性膜上にガラスグレーズ2を形成したサーマルヘ
ッドが知られていた。 (以下Cタイプ)
[発明が解決しようとする課題]
しかし、bタイプのような構成のサーマルヘッドでは、
最近の高画質化に対応したヘッドの印画角度の増大に対
応ができなくなってきた。即ち、ヘッドの印画角度を増
加させると、基板端がインクフィルムや紙に接触し、印
画圧力の分散による印画品質の低下、或いは、接触によ
るすじ汚れが問題となってきた。また、Cタイプのよう
な構成のサーマルヘッドでは、導電性厚膜の形成後にガ
ラスグレーズを形成するため、このガラスグレーズの焼
成時に、十分な温度がかけられず、熱的特性の不十分な
ガラスを使用せざるを得ないをいう課題があった。[Prior Art J] Conventionally, for example, as shown in FIG. 2, a glass glaze 2 is formed on a substrate 1, and a conductive film 3 is formed by thick film printing on the boundary between the glass glaze and the substrate. was known. (Hereinafter referred to as b type) Also, as shown in Fig. 3, a chamfered portion 4 is provided at one end of the substrate 1, a conductive film 3 is formed near the chamfered portion by thick film printing, and then a conductive film 3 is formed on the conductive film. A thermal head on which a glass glaze 2 was formed was known. (hereinafter referred to as C type) [Problem to be solved by the invention] However, in a thermal head with a configuration like B type,
It has become impossible to keep up with the increase in printing angles of heads that correspond to the recent advances in image quality. That is, when the printing angle of the head is increased, the edge of the substrate comes into contact with the ink film or paper, resulting in problems such as deterioration of printing quality due to dispersion of printing pressure, or streak staining due to contact. In addition, in a thermal head with a configuration like the C type, a glass glaze is formed after forming a conductive thick film, so when firing this glass glaze, a sufficient temperature is not applied, and glass with insufficient thermal properties is heated. There was a problem in having no choice but to use it.
本発明によるサーマルヘッドは、印画角度の増大に対応
が可能で、且つ、熱的特性の十分なガラスグレーズを使
用したサーマルヘッドを提供することを目的としている
。It is an object of the present invention to provide a thermal head that can cope with an increase in printing angle and uses a glass glaze with sufficient thermal properties.
[課題を解決するための手段]
そこで、本発明のサーマルヘッドは、第1図に示すよう
に(以下Cタイプ)、基板1の一端に面取部4を設け、
該面取り部の近傍、に前記ガラスグレーズ2が形成され
、更に少なくとも前記面取り部4上には厚膜印刷による
導電性膜3が形成されていることを特徴とする。[Means for Solving the Problems] Therefore, the thermal head of the present invention, as shown in FIG.
The glass glaze 2 is formed in the vicinity of the chamfered portion, and furthermore, a conductive film 3 is formed by thick film printing at least on the chamfered portion 4.
[実施例]
本発明による実施例を図面に基づいて説明するが、サー
マルヘッドはシリアルルタイブ、ラインタイプを問わず
、適用が可能である。また、厚膜印刷による導電性膜は
Au、Ag−Pd等、種々の物質が使用できる。[Example] An example according to the present invention will be described based on the drawings, but the thermal head can be applied regardless of whether it is a serial type or a line type. Further, various materials such as Au, Ag-Pd, etc. can be used for the conductive film formed by thick film printing.
試験は、 (1)最大印画角度、 (2)導電膜の電流
容量評価のための、1 dot通電時の発熱温度ピーク
値に対する全dot3i電時の発熱温度ピークの低下率
、 (3)ガラスグレーズの熱特性評価のためのステッ
プアップストレス試験(SST試験)について行った。The tests were as follows: (1) Maximum printing angle, (2) Decrease rate of heat generation temperature peak when all dots are energized relative to peak heat generation temperature when energizing one dot to evaluate current capacity of conductive film, and (3) Glass glaze. A step-up stress test (SST test) was conducted to evaluate the thermal characteristics of the steel.
(2)の発熱温度ピークの低下率について説明すると、
サーマルヘッドでは、各発熱部に接続されているそれぞ
れの電極(セグメント電極)とすべての発熱部に共通に
接続されている電極(コモン電極)があり、待機状態(
非印字状態)ではこのセグメント電極とコモン電極は同
電位(High)に保たれている。印字時にはセグメン
ト側が接地され、コモン電極から発熱部を経てセグメン
ト側へと電流が流れる。今例えば、1ドツト(抵抗値R
)に通電させ、必要なピーク温度を得るためのエネルギ
ーがε(mj)であった時に、その時のパルス幅をtと
すると、電流値1は、1=J(ε/ (Rt))
で表される。コモン電極の抵抗値をRcとすると、コモ
ン電極での電圧降下Δ■は、
△V= 1Rc=RcJ(ε/ (Rt))で表される
。従って、より多くのドツトに通電すると、電圧降下は
通電するドツト数に比例して増加するため、実際に発熱
部にかかる電圧が減少し、1ドツト通電時の発熱温度と
、多ドツト通電時の発熱温度に差が生じることになる。To explain the rate of decrease in the exothermic temperature peak in (2),
The thermal head has individual electrodes (segment electrodes) connected to each heat generating part and an electrode (common electrode) commonly connected to all heat generating parts.
In the non-printing state), the segment electrode and the common electrode are kept at the same potential (High). During printing, the segment side is grounded, and current flows from the common electrode to the segment side via the heat generating section. Now, for example, 1 dot (resistance value R
), and the energy required to obtain the required peak temperature is ε(mj), and the pulse width at that time is t, the current value 1 is expressed as 1=J(ε/(Rt)). be done. When the resistance value of the common electrode is Rc, the voltage drop Δ■ at the common electrode is expressed as ΔV=1Rc=RcJ(ε/(Rt)). Therefore, when more dots are energized, the voltage drop increases in proportion to the number of energized dots, so the voltage actually applied to the heat generating part decreases, and the heat generation temperature when one dot is energized is different from that when multiple dots are energized. This results in a difference in the heat generation temperature.
サンプルは、
(1)Cタイプに記した1の値を100〜800μの間
で変化させたもの、
(2)bタイプに記した1の値を100〜800μの間
で変化させたもの、
(3)Cタイプに記した1の値を100〜800μの間
で変化させたもの
を使用した。The samples are (1) one in which the value of 1 written in the C type was varied between 100 and 800μ, (2) one in which the value of 1 in the B type was varied between 100 and 800μ, ( 3) The value of 1 described in Type C was varied between 100 and 800μ.
第4図は、各サンプルの1に対する最大印画角度と、発
熱温度低下率をプロットした図である。FIG. 4 is a diagram plotting the maximum printing angle and the rate of decrease in heat generation temperature for each sample with respect to 1.
bタイプは、印画角度が大きくとれず、また、1ドツト
通電に対する全ドツト通電時の発熱温度の低下率が大き
いことがわかる。Cタイプはガラスグレーズ下の厚膜電
極面積が広くとれるため、電流容量が大きくなり、発熱
温度低下率はかなりOに近くすることが可能であり、且
つ印画角度に於いても十分なものが得られる。bタイプ
は、発熱温度低下率、印画角度ともCタイプより劣るも
のの、やはり十分な特性を得ることが可能である。It can be seen that type b cannot have a large printing angle, and the rate of decrease in heat generation temperature when all dots are energized relative to one dot energization is large. Since the C type has a large area of thick film electrode under the glass glaze, the current capacity is large and the heat generation temperature reduction rate can be made quite close to O, and a sufficient printing angle can be obtained. It will be done. Although type B is inferior to type C in both the heating temperature reduction rate and the printing angle, it is still possible to obtain sufficient characteristics.
第5図は、各タイプl二200μの物のSST試験のデ
ータである。投入エネルギーに対する発熱温度はCタイ
プ、bタイプ、Cタイプともに有意差はみられないが、
各エネルギーに対する抵抗値変化率はCタイプがもつと
も早く変化し始めることがわかる。従って、Cタイプヘ
ッドのグレーズは熱的に特性が劣っていることがわかる
。FIG. 5 shows SST test data for each type of 200μ. Although there is no significant difference in the heat generation temperature relative to the input energy among type C, type b, and type C,
It can be seen that the rate of change in resistance value with respect to each energy starts to change faster for type C. Therefore, it can be seen that the glaze of the C type head has inferior thermal characteristics.
[発明の効果]
以上のように、本発明によれば、 1ドツト通電時に対
する全ドツト通電時の発熱温度低下率が小さく、且つ、
印画角度を大きく取れ、更に、熱的特性がよい為、高画
質であり、耐久性の高いサーマルヘッドを得ることがで
きる。[Effects of the Invention] As described above, according to the present invention, the rate of decrease in heat generation temperature when all dots are energized compared to when one dot is energized is small, and
Since the printing angle can be widened and the thermal properties are good, a thermal head with high image quality and high durability can be obtained.
第1図は本発明のサーマルヘッドの断面図。
1 ・・・・・・ 基板
2 ・・・・・・ グレーズガラス
3 ・・・・・・ 厚膜印刷の電極
4 ・・・・・・ 面取り部
5 ・・・・・・ 発熱抵抗層
6 ・・・・・・ 発熱部
7 ・・・・・・ セグメント電極
8 ・・・・・・ コモン電極
9 ・・・・・・ 保護層
第2図及び第3図は従来のサーマルヘッドの断面図。
第4図各タイプのコモン電極側の距離を変化させたとき
の最大印画角と温度低下率の関係を示す図。
第5図は各タイプのSST試験結果を示す図。FIG. 1 is a sectional view of the thermal head of the present invention. 1... Substrate 2... Glaze glass 3... Thick film printed electrode 4... Chamfered portion 5... Heat generating resistor layer 6. ... Heat generating part 7 ... Segment electrode 8 ... Common electrode 9 ... Protective layer FIGS. 2 and 3 are cross-sectional views of a conventional thermal head. FIG. 4 is a diagram showing the relationship between the maximum printing angle and the temperature reduction rate when the distance on the common electrode side of each type is changed. FIG. 5 is a diagram showing the results of each type of SST test.
Claims (1)
グレーズ上に形成された発熱部とを有するサーマルヘッ
ドに於いて、前記基板の少なくとも一端が面取り加工が
されており、該面取り部の近傍に前記ガラスグレーズが
形成され、少なくとも前記面取り部上には厚膜印刷によ
る導電性膜が形成されていることを特徴とするサーマル
ヘッド。In a thermal head having a substrate, a glass glaze formed on the substrate, and a heat generating part formed on the glass glaze, at least one end of the substrate is chamfered, and a portion near the chamfer is formed. A thermal head characterized in that the glass glaze is formed, and a conductive film is formed by thick film printing at least on the chamfered portion.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32762689A JPH03187763A (en) | 1989-12-18 | 1989-12-18 | Thermal head |
EP90107840A EP0395001B1 (en) | 1989-04-26 | 1990-04-25 | Thermal print head and method of making same |
DE69005014T DE69005014T2 (en) | 1989-04-26 | 1990-04-25 | Thermal print head and process for its manufacture. |
US07/514,223 US5231420A (en) | 1989-04-26 | 1990-04-25 | Thermal print head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32762689A JPH03187763A (en) | 1989-12-18 | 1989-12-18 | Thermal head |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03187763A true JPH03187763A (en) | 1991-08-15 |
Family
ID=18201152
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP32762689A Pending JPH03187763A (en) | 1989-04-26 | 1989-12-18 | Thermal head |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03187763A (en) |
-
1989
- 1989-12-18 JP JP32762689A patent/JPH03187763A/en active Pending
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