JPH0118870B2 - - Google Patents
Info
- Publication number
- JPH0118870B2 JPH0118870B2 JP56089581A JP8958181A JPH0118870B2 JP H0118870 B2 JPH0118870 B2 JP H0118870B2 JP 56089581 A JP56089581 A JP 56089581A JP 8958181 A JP8958181 A JP 8958181A JP H0118870 B2 JPH0118870 B2 JP H0118870B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- heating element
- temperature
- electrically connected
- signal
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 35
- 238000001514 detection method Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 238000007740 vapor deposition Methods 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)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、感熱プリンタ等に用いられる感熱ヘ
ツドの発熱体温度を制御する感熱ヘツドの温度制
御装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a temperature control device for a thermal head that controls the temperature of a heating element of a thermal head used in a thermal printer or the like.
熱転写型の感熱プリンタにおける印刷記録部で
は、記録すべき信号に応じて発熱された感熱ヘツ
ドからの熱がインクフイルムのインク層体に伝達
され、この熱がインクを溶解し、記録用紙に溶解
したインクが付着されることで、記録を行つてい
る。
In the print recording section of a thermal transfer type thermal printer, heat generated from the thermal head in response to the signal to be recorded is transmitted to the ink layer of the ink film, and this heat melts the ink and dissolves it on the recording paper. Recording is performed by depositing ink.
この場合、感熱ヘツドからインク層体へ熱が伝
達される過程では、周囲への熱拡散が大きく、か
つ伝達時間の遅延を生ずる。このため、感熱ヘツ
ドの温度とインク層体の温度との間には、大きな
温度差が生じ、さらに伝達遅れのためピーク温度
に時間的ずれが生じる。これは、印字速度が遅く
なるので好ましくない。インク層体の温度の立上
りを良くするには、感熱ヘツドの温度を急速に上
昇すべく発熱体に大電力を加えればよい。しか
し、電力を多く与え過ぎると、ヘツドの温度が異
常に上昇してヘツドを破壊する恐れがある。この
ため、ヘツドのピーク温度があまり高くならない
ように供給電力を制限する必要がある。 In this case, in the process of transferring heat from the heat-sensitive head to the ink layer, heat diffusion to the surroundings is large and the transfer time is delayed. For this reason, a large temperature difference occurs between the temperature of the heat-sensitive head and the temperature of the ink layer, and furthermore, due to the transmission delay, a time lag occurs in the peak temperature. This is undesirable because it slows down the printing speed. In order to improve the rise in temperature of the ink layer, a large amount of power may be applied to the heating element in order to rapidly raise the temperature of the heat-sensitive head. However, if too much power is applied, the temperature of the head may rise abnormally and the head may be destroyed. For this reason, it is necessary to limit the power supply so that the peak temperature of the head does not become too high.
従来、このような問題を解決するには、ヘツド
の温度を検出し、その温度を目標値とするよう発
熱体に供給する電力を調節すればよい。このよう
な制御を行うものとして、例えば、特開昭55−
27208号公報、特開昭55−39333号公報に開示され
た技術が知られている。 Conventionally, in order to solve this problem, it is necessary to detect the temperature of the head and adjust the power supplied to the heating element so that the detected temperature becomes the target value. For example, as a device that performs such control,
Techniques disclosed in Japanese Patent Application Laid-open No. 27208 and Japanese Unexamined Patent Publication No. 55-39333 are known.
しかし、実際にヘツドの温度を検出しようとす
ると次のような問題がある。すなわち、発熱体近
傍にサーミスタ等の感温素子を設けたとしても、
記録に影響を与えないで発熱体自体の温度を正確
に求めることは困難である。また、感温素子に熱
が伝達されるまでの時間遅れも大きく、仮に正確
に温度が測定できたとしても、感熱ヘツドの温度
を目標値に制御することは困難である。また、感
熱ヘツドの製造面からは、出来るだけ簡単な構成
が好ましく、感温素子からの信号を取出すための
配線が多いのは問題である。
However, when trying to actually detect the temperature of the head, the following problems arise. In other words, even if a temperature sensing element such as a thermistor is installed near the heating element,
It is difficult to accurately determine the temperature of the heating element itself without affecting the recording. Furthermore, there is a large time delay until heat is transferred to the temperature sensing element, and even if the temperature can be measured accurately, it is difficult to control the temperature of the heat sensitive head to a target value. Further, from the viewpoint of manufacturing the heat-sensitive head, it is preferable to have a structure as simple as possible, and the problem is that there are many wirings for extracting signals from the temperature-sensitive element.
そこで、本発明の目的は、簡単な構成で、発熱
体の温度を正確に高応答で検出し、正確な温度制
御を実現する感熱ヘツドの温度制御装置を提供す
ることである。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a temperature control device for a thermal head that has a simple configuration, accurately detects the temperature of a heating element with high response, and realizes accurate temperature control.
本発明は、発熱体と、この発熱体に電力を供給
するためにこの発熱体と電気的に接続された第１
の電極と、同様にこの発熱体に電力を供給するた
めにこの発熱体と電気的に接続された第２の電極
とを備えた感熱ヘツドの温度制御を行うものにお
いて、その先端部がこの発熱体と反記録面側で接
し、しかもその先端部が第２の電極と電気的に接
続される第３の電極を設け、第２の電極と第３の
電極とで熱電対を構成すると共に、該第３の電極
から得られた信号値と設定値とを比較し、その偏
差に応じた信号を出力する比較器と、この比較器
からの信号を入力し、偏差を少なくするように発
熱体に供給する電力を調整する調整部とを備えた
ことを特徴とする。
The present invention includes a heating element and a first electrically connected heating element electrically connected to the heating element for supplying power to the heating element.
and a second electrode electrically connected to the heating element for supplying power to the heating element, the tip of which controls the temperature of the heating head. A third electrode is provided which is in contact with the body on the opposite recording surface side and whose tip end is electrically connected to the second electrode, and the second electrode and the third electrode constitute a thermocouple, A comparator that compares the signal value obtained from the third electrode with a set value and outputs a signal according to the deviation, and a heating element that receives the signal from this comparator and reduces the deviation. and an adjustment section that adjusts the power supplied to the.
第３の電極は、その先端部が発熱体と反記録面
側で接しており、しかも第２の電極とは電気的に
接続されている。そして、第２の電極と第３の電
極の先端部とで熱電対を構成するようにしてい
る。第２の電極先端部と発熱体とが接しているの
で、発熱体の発熱が直ちに伝達され、発熱体の温
度を直ちに（時間遅れなく）検出できる。また、
中間の媒体がないので、正確な検出が可能とな
る。第３の電極が発熱体の反記録面側で接するの
で、記録に対して支障が生じない。更に、第３の
電極と第２の電極とで熱電対を構成し、発熱体へ
の電力供給のための一方の電極である第２の電極
が熱電対の一方の金属を兼ねており、しかも温度
の検出結果が第３の電極から取出されるので、極
めて簡単な構造となる。
The third electrode has its tip in contact with the heating element on the side opposite to the recording surface, and is electrically connected to the second electrode. The tip of the second electrode and the third electrode constitute a thermocouple. Since the second electrode tip and the heating element are in contact with each other, the heat generated by the heating element is immediately transferred, and the temperature of the heating element can be detected immediately (without time delay). Also,
Accurate detection is possible because there is no intermediate medium. Since the third electrode is in contact with the heating element on the opposite recording surface side, there is no problem with recording. Furthermore, the third electrode and the second electrode constitute a thermocouple, and the second electrode, which is one electrode for supplying power to the heating element, also serves as one metal of the thermocouple. Since the temperature detection result is taken out from the third electrode, the structure is extremely simple.
以下本発明の実施例を図面を参照して説明す
る。
Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明の装置の一実施例を備えた感熱
ヘツドを示すものである。図において、感熱ヘツ
ドは一般に蒸着、スパツタリングの印刷等の方法
で形成される。その構造は、基板１上に第１の電
極（一方の電極）２と第２の電極（他方の共通電
極）３を互い違いに配置し、両電極２，３の上に
発熱体４をのせ、この発熱体４を介して電極２と
第３の電極３とが電気的に接続されるようになつ
ている。この発熱体４内の第３の電極３先端部に
は温度検出部５が形成されている。この温度検出
部５は２種類の電極を接触させて、その接触点で
温度を測定する熱電対形式のものである。この熱
電対の一方の電極は第２図に示すように、第３の
電極３と兼用しており、他方の電極６は第３の電
極３との接触部すなわち温度測定部分７を残して
絶縁シート８を介して第３の電極３と絶縁分離し
ている。この構成により温度検出部５によつて、
発熱体４の温度変化を即時に直接的に検出するこ
とができる。 FIG. 1 shows a thermal head equipped with an embodiment of the device of the invention. In the figure, the thermal head is generally formed by a method such as vapor deposition, sputtering printing, or the like. The structure is such that a first electrode (one electrode) 2 and a second electrode (the other common electrode) 3 are arranged alternately on a substrate 1, and a heating element 4 is placed on both electrodes 2 and 3. The electrode 2 and the third electrode 3 are electrically connected via the heating element 4. A temperature detection section 5 is formed at the tip of the third electrode 3 within this heating element 4 . This temperature detection section 5 is of a thermocouple type that brings two types of electrodes into contact and measures the temperature at the contact point. As shown in FIG. 2, one electrode of this thermocouple also serves as the third electrode 3, and the other electrode 6 is insulated, leaving a contact part with the third electrode 3, that is, a temperature measurement part 7. It is insulated and separated from the third electrode 3 via the sheet 8. With this configuration, the temperature detection section 5 can
Temperature changes in the heating element 4 can be immediately and directly detected.
次に、この温度検出部５からの検出信号によ
り、発熱体４の温度を制御する制御回路の一例を
第３図に示す。この図において第１図および第２
図と同符号のものは同一部分である。この制御回
路はセンスアンプ９、インバータ１０、アンド回
路１１、トランジスタ１２を備えている。センス
アンプ９の＋側端子は温度検出部５に、−側端子
は比較電圧１３にそれぞれ接続されている。この
センスアンプ９は温度検出部５、具体的には第３
の電極３からの信号が比較電圧１３、すなわち設
定電圧より大きくなつたときに、出力信号９ａを
出力する。アンド回路１１はインバータ１０から
の信号と印字信号１４とを入力し、駆動信号１１
ａをトランジスタ１２に出力する。 Next, an example of a control circuit that controls the temperature of the heating element 4 based on the detection signal from the temperature detection section 5 is shown in FIG. In this figure, Figures 1 and 2
Components with the same reference numerals as those in the figure are the same parts. This control circuit includes a sense amplifier 9, an inverter 10, an AND circuit 11, and a transistor 12. The + side terminal of the sense amplifier 9 is connected to the temperature detection section 5 , and the - side terminal is connected to the comparison voltage 13 . This sense amplifier 9 is connected to the temperature detection section 5, specifically the third
When the signal from the electrode 3 becomes larger than the comparison voltage 13, that is, the set voltage, the output signal 9a is output. The AND circuit 11 inputs the signal from the inverter 10 and the print signal 14, and receives the drive signal 11.
a to the transistor 12.
次に上述した本発明の実施例の動作を説明す
る。 Next, the operation of the embodiment of the present invention described above will be explained.
第１図あるいは第２図に示した如き温度検出部
５による温度検出信号が第３図に示すセンスアン
プ９の＋側端子に入力されると、センスアンプ９
は温度検出部５からの出力信号と比較電圧１３と
を比較する。そして、温度検出部５からの信号が
比較電圧１３すなわち設定温度より大きくなつた
場合には、センスアンプ９は第４図に示すように
増幅され、かつ整形された波形を有するセンスア
ンプ出力信号９ａを出力する。この出力信号９ａ
はインバータ１０を経てアンド回路１１に入力さ
れて他方の入力信号（印字信号）１４を制御す
る。そのアンド回路１１より出力される駆動信号
１１ａはトランジスタ１２のベースに加えられ、
発熱体１４の電流をオン、オフする。これによ
り、第４図に示すようなヘツド温度Ｔを得ること
ができる。 When a temperature detection signal from the temperature detection unit 5 as shown in FIG. 1 or 2 is input to the + side terminal of the sense amplifier 9 shown in FIG. 3, the sense amplifier 9
compares the output signal from the temperature detection section 5 and the comparison voltage 13. When the signal from the temperature detection section 5 becomes larger than the comparison voltage 13, that is, the set temperature, the sense amplifier 9 outputs a sense amplifier output signal 9a having an amplified and shaped waveform as shown in FIG. Output. This output signal 9a
is input to the AND circuit 11 via the inverter 10 and controls the other input signal (print signal) 14. The drive signal 11a output from the AND circuit 11 is applied to the base of the transistor 12,
The current of the heating element 14 is turned on and off. As a result, a head temperature T as shown in FIG. 4 can be obtained.
以上説明したように、本発明によれば、発熱体
の温度検出を高応答で正確に行うことができ、感
熱ヘツドの温度を目標値に制御することができ
る。また、第２の電極と第３の電極の先端部で熱
電対を構成するようにしたので、構造が簡単とな
り、より高密度の画像記録に適した感熱ヘツドの
製作を可能とする。
As described above, according to the present invention, the temperature of the heating element can be accurately detected with high response, and the temperature of the heat-sensitive head can be controlled to a target value. Furthermore, since the thermocouple is formed by the tips of the second and third electrodes, the structure is simplified, and a thermosensitive head suitable for higher-density image recording can be manufactured.
第１図は本発明の一実施例に用いられる温度検
出部を備えた感熱ヘツドの斜視図、第２図は第１
図に示した温度検出部の断面図、第３図は本発明
の一実施例を示す図、第４図は本発明の制御動作
を説明するためのタイムチヤートである。
１……基板、２……電極、３……第３の電極、
４……発熱体、５……温度検出部、６……熱電時
の他方の電極、７……温度測定部分。
FIG. 1 is a perspective view of a thermal head equipped with a temperature detection section used in one embodiment of the present invention, and FIG.
FIG. 3 is a diagram showing an embodiment of the present invention, and FIG. 4 is a time chart for explaining the control operation of the present invention. 1...Substrate, 2...Electrode, 3...Third electrode,
4...Heating element, 5...Temperature detection section, 6...The other electrode during thermoelectricity, 7...Temperature measurement part.
Claims (1)
にこの発熱体と電気的に接続された第１の電極
と、同様にこの発熱体に電力を供給するためにこ
の発熱体と電気的に接続された第２の電極と、を
備えた感熱ヘツドの温度制御を行うものにおい
て、 その先端部が前記発熱体と反記録面側で接し、
しかもその先端部が前記第２の電極と電気的に接
続される第３の電極を設け、前記第２の電極と該
第３の電極とで熱電対を構成すると共に、 該第３の電極から得られた信号値と設定値とを
比較し、その偏差に応じた信号を出力する比較器
と、 該比較器の出力信号を入力し、該偏差を少なく
するように前記電力を調整する調整部とを備えた
こと を特徴とする感熱ヘツドの温度制御装置。[Claims] 1. A heating element, a first electrode electrically connected to the heating element for supplying power to the heating element, and a first electrode electrically connected to the heating element for supplying power to the heating element; A second electrode electrically connected to a heating element for controlling the temperature of a thermal head, the tip of which is in contact with the heating element on a side opposite to the recording surface,
Moreover, a third electrode is provided, the tip of which is electrically connected to the second electrode, and the second electrode and the third electrode constitute a thermocouple, and from the third electrode a comparator that compares the obtained signal value with a set value and outputs a signal according to the deviation; and an adjustment unit that receives the output signal of the comparator and adjusts the power so as to reduce the deviation. A temperature control device for a thermal head, characterized by comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56089581A JPS57205180A (en) | 1981-06-12 | 1981-06-12 | Temperature controller for heat sensitive head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56089581A JPS57205180A (en) | 1981-06-12 | 1981-06-12 | Temperature controller for heat sensitive head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57205180A JPS57205180A (en) | 1982-12-16 |
| JPH0118870B2 true JPH0118870B2 (en) | 1989-04-07 |
Family
ID=13974751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56089581A Granted JPS57205180A (en) | 1981-06-12 | 1981-06-12 | Temperature controller for heat sensitive head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57205180A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59181754U (en) * | 1983-05-23 | 1984-12-04 | ロ−ム株式会社 | thermal printer head |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54128448U (en) * | 1978-02-28 | 1979-09-06 |
-
1981
- 1981-06-12 JP JP56089581A patent/JPS57205180A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57205180A (en) | 1982-12-16 |
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