JPH05169707A - Recording apparatus - Google Patents
Recording apparatusInfo
- Publication number
- JPH05169707A JPH05169707A JP3342995A JP34299591A JPH05169707A JP H05169707 A JPH05169707 A JP H05169707A JP 3342995 A JP3342995 A JP 3342995A JP 34299591 A JP34299591 A JP 34299591A JP H05169707 A JPH05169707 A JP H05169707A
- Authority
- JP
- Japan
- Prior art keywords
- resistance value
- heating resistor
- resistor
- value
- heating
- 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.)
- Withdrawn
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- Accessory Devices And Overall Control Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、各種印刷に利用される
記録装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device used for various printing.
【０００２】[0002]
【従来の技術】近年、記録装置においては、サーマルヘ
ッドの発熱抵抗体をより小さくして高解像度化を図るこ
とや、発熱抵抗体の抵抗値のばらつき、発熱抵抗体の蓄
熱、環境温度等の影響による濃度むらを補償することに
より、高画質化を図ること等がなされている。2. Description of the Related Art In recent years, in a recording apparatus, a heating resistor of a thermal head has been made smaller to achieve higher resolution, a resistance value of the heating resistor varies, heat accumulated in the heating resistor, environmental temperature, etc. By compensating for the uneven density due to the influence, it is possible to improve the image quality.
【０００３】サーマルヘッドの発熱抵抗体は、寿命期に
おいて、その抵抗値が初期値から徐々に増加していき、
ついには断線するが、その抵抗値の増加に伴い、発熱エ
ネルギーが低下していくため記録濃度も低下し、記録画
像に濃度むらを生じる。また、サーマルヘッドと記録媒
体の間に、高硬度の微小な異物を巻き込んでしまい、発
熱抵抗体に欠陥が生じた場合においても、同様に発熱抵
抗体の抵抗値が増加し、欠陥の度合がひどい場合には断
線状態となる。In the heat generating resistor of the thermal head, the resistance value gradually increases from the initial value during the life period,
Eventually, the wire breaks, but as the resistance value increases, the heat generation energy decreases, so the recording density also decreases, and uneven density occurs in the recorded image. Further, even when a minute foreign substance having a high hardness is caught between the thermal head and the recording medium and a defect occurs in the heating resistor, the resistance value of the heating resistor also increases and the degree of the defect increases. In severe cases, the wire will be disconnected.
【０００４】このような発熱抵抗体の欠陥が生じた状態
で印刷を行うと、筋状の欠陥のある印刷物を発生させて
しまうことになる。このため、例えば、サーマルヘッド
駆動電源端子と駆動電源との間に、リレー等のスイッチ
を設け、通常印刷時には、サーマルヘッド駆動電源端子
と駆動電源の両端子間が直結され、非印刷時の自己診断
時には、両端子間に抵抗が挿入された回路が接続される
ようにし、Ｎ個の発熱抵抗体を順次通電駆動し、このと
きの抵抗とサーマルヘッドの間の電圧、すなわち、サー
マルヘッド駆動電源端子間の電圧を、基準電圧とコンパ
レータにより比較し、発熱抵抗体の欠陥を検出する検出
手段を具備した記録装置が提案されている。If printing is performed in the state where such a defect of the heating resistor has occurred, a printed matter having streak-like defects will be generated. For this reason, for example, a switch such as a relay is provided between the thermal head drive power supply terminal and the drive power supply, and during normal printing, the thermal head drive power supply terminal and the drive power supply terminal are directly connected to each other, and the At the time of diagnosis, a circuit in which a resistor is inserted between both terminals is connected, N heat generating resistors are sequentially energized and driven, and the voltage between the resistor and the thermal head at this time, that is, the thermal head drive power supply. There has been proposed a recording apparatus including a detection unit that compares a voltage between terminals with a reference voltage by a comparator and detects a defect of a heating resistor.
【０００５】[0005]
【発明が解決しようとする課題】ところで、昇華型感熱
転写プリンタの場合、発熱抵抗体の発熱エネルギーによ
り記録濃度を制御しており、各々の発熱抵抗体の抵抗値
に差がある場合、通電駆動時の発熱エネルギーに差が生
じ、記録濃度にむらが生じてしまう。例えば、1つの発
熱抵抗体に欠陥が生じ、隣接する画素の発熱抵抗体との
抵抗値の差が大きくなってしまった場合、欠陥画素の濃
度が薄くなってしまうため、筋状の濃度むらが抵抗値の
増加に伴い顕著となっていく。By the way, in the case of a sublimation type thermal transfer printer, the recording density is controlled by the heat energy of the heat generating resistors, and when there is a difference in the resistance value of each heat generating resistor, energization drive is performed. A difference occurs in heat generation energy at the time, and uneven recording density occurs. For example, if a defect occurs in one heating resistor and the difference in the resistance value between the heating resistor of the adjacent pixel becomes large, the density of the defective pixel becomes thin, resulting in streaky density unevenness. It becomes remarkable as the resistance value increases.
【０００６】一方、サーマルヘッドの発熱抵抗体には、
一般的に±20％程度の抵抗値ばらつきがあるが、隣接す
る画素の抵抗値差が大きなものは、記録濃度差が顕著で
あるため製造時において排除される。ところが、全体と
しては、±20％程度の抵抗値のばらつきがあるため、上
述した従来の記録装置で発熱抵抗体の欠陥を検出する場
合、コンパレータのしきい値、すなわち、基準電圧は、
初期の抵抗値ばらつきを考慮した値に設定する必要があ
る。このため、抵抗値の増大がかなり顕著な欠陥しか検
出できず、例えば発熱抵抗体に抵抗値の増大があまり大
きくない欠陥が生じたような場合、この欠陥を発見する
ことができず、筋状の濃度むらのある印刷が行われてし
まうという問題があった。On the other hand, the heating resistor of the thermal head is
Generally, there is a resistance value variation of about ± 20%, but the one having a large resistance value difference between adjacent pixels is excluded at the time of manufacturing because the recording density difference is remarkable. However, as a whole, there is a variation in the resistance value of about ± 20%, so when detecting a defect of the heating resistor with the above-described conventional recording device, the threshold value of the comparator, that is, the reference voltage is
It is necessary to set the value in consideration of the initial resistance value variation. For this reason, it is possible to detect only a defect in which the increase in resistance value is extremely remarkable. For example, when a defect in which the resistance value does not increase significantly occurs in the heating resistor, this defect cannot be found, and the streak pattern cannot be detected. There was a problem that printing with uneven density was performed.
【０００７】本発明は、かかる従来の事情に対処してな
されたもので、記録画質に影響するような発熱抵抗体の
欠陥あるいは劣化等を、発熱抵抗体の初期の抵抗値のば
らつきに影響されずに従来に較べて精度良く検出するこ
とができ、信頼性の向上を図ることのできる記録装置を
提供しようとするものである。The present invention has been made in consideration of such a conventional situation, and defects such as a defect or deterioration of the heating resistor which affects the recording image quality are influenced by the variation in the initial resistance value of the heating resistor. It is therefore an object of the present invention to provide a recording apparatus that can detect with higher accuracy than before and can improve reliability.
【０００８】[0008]
【課題を解決するための手段】すなわち、請求項１記載
の本発明の記録装置は、規則正しく配列された複数の発
熱抵抗体と、前記発熱抵抗体に選択的に通電し、駆動す
ることにより、記録のための熱エネルギーを発生させる
通電制御手段と、前記発熱抵抗体を自己診断のために順
次通電駆動する診断用駆動手段と、前記診断用駆動手段
による通電駆動時に各発熱抵抗体の抵抗値を測定する抵
抗値測定手段と、前記抵抗値測定手段によって測定され
た各々隣接する前記発熱抵抗体の抵抗値の差を比較して
該発熱抵抗体の良否を判定する手段とを具備したことを
特徴とする。That is, according to the recording apparatus of the present invention as set forth in claim 1, a plurality of regularly arranged heating resistors and by selectively energizing and driving the heating resistors, Energization control means for generating thermal energy for recording, diagnostic drive means for sequentially energizing the heating resistors for self-diagnosis, and resistance value of each heating resistor when energized by the diagnostic driving means And a means for determining the quality of the heating resistor by comparing the difference between the resistance values of the adjacent heating resistors measured by the resistance value measuring means. Characterize.
【０００９】また、請求項２記載の本発明の記録装置
は、規則正しく配列された複数の発熱抵抗体と、前記発
熱抵抗体に選択的に通電し、駆動することにより、記録
のための熱エネルギーを発生させる通電制御手段と、前
記発熱抵抗体を自己診断のために順次通電駆動する診断
用駆動手段と、前記診断用駆動手段による通電駆動時に
各発熱抵抗体の抵抗値を測定する抵抗値測定手段と、前
記各発熱抵抗体の初期の抵抗値を記憶する記憶手段と、
前記抵抗値測定手段によって測定された結果と、前記記
憶手段に記憶された初期の抵抗値とを比較して該発熱抵
抗体の良否を判定する手段とを具備したことを特徴とす
る。According to a second aspect of the present invention, there is provided a plurality of heating resistors arranged regularly, and the heating resistors are selectively energized and driven to generate thermal energy for recording. Generating means, a diagnostic driving means for sequentially energizing the heating resistors for self-diagnosis, and a resistance value measurement for measuring the resistance value of each heating resistor during energization driving by the diagnostic driving means. Means and storage means for storing an initial resistance value of each of the heating resistors,
It is characterized by further comprising means for comparing the result measured by the resistance value measuring means with the initial resistance value stored in the storage means to judge the quality of the heating resistor.
【００１０】[0010]
【作用】上記構成の本発明の記録装置では、診断用駆動
手段により発熱抵抗体を順次通電駆動し、抵抗値測定手
段によって発熱抵抗体の駆動電流値から各発熱抵抗体の
抵抗値を測定する。そして、各々隣接する発熱抵抗体の
抵抗値の差を比較すること、あるいは、記憶手段に記憶
された初期の抵抗値と測定された抵抗値を測定すること
により、発熱抵抗体の良否を判定する。In the recording apparatus of the present invention having the above-described structure, the heating resistors are sequentially energized and driven by the diagnostic driving means, and the resistance value of each heating resistor is measured from the drive current value of the heating resistor by the resistance value measuring means. .. Then, the quality of the heating resistors is determined by comparing the differences in the resistance values of the adjacent heating resistors, or by measuring the initial resistance value and the measured resistance value stored in the storage means. ..
【００１１】したがって、記録画質に影響するような発
熱抵抗体の欠陥あるいは劣化等を、発熱抵抗体の初期の
抵抗値のばらつきに影響されずに従来に較べて精度良く
検出することができ、信頼性の向上を図ることができ
る。Therefore, a defect or deterioration of the heating resistor that affects the recording image quality can be detected more accurately than before without being affected by the variation in the initial resistance value of the heating resistor, and the reliability can be improved. It is possible to improve the sex.
【００１２】[0012]
【実施例】以下、本発明の詳細を、一実施例について図
面を参照して説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the accompanying drawings.
【００１３】図１は、本発明の一実施例の記録装置の要
部構成を示すもので、同図において１０はサーマルヘッ
ドを示している。サーマルヘッド１０には、絶縁性の基
板上にＮ個の発熱抵抗体１１が直線的に配列されてい
る。そして、これらの発熱抵抗体１１と同数のＮ個の１
ラインの画素信号は、画素信号入力端子１２に直列に入
力され、発熱抵抗体１１と同数のＮ個のシフトレジスタ
１３に読み込まれる。FIG. 1 shows a main structure of a recording apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 10 shows a thermal head. In the thermal head 10, N heat generating resistors 11 are linearly arranged on an insulating substrate. Then, the same number of N 1's as those of the heating resistors 11
The pixel signals of the lines are serially input to the pixel signal input terminal 12 and read into the N shift registers 13 in the same number as the heating resistors 11.
【００１４】このシフトレジスタ１３に読み込まれた画
素信号は、発熱抵抗体１１の各々に接続されたデータ・
ラッチ回路およびＦＥＴ等のスイッチング素子からなる
ドライブ回路１４に供給され、画素信号に応じてドライ
ブ回路１４は選択的に駆動される。これにより、サーマ
ルヘッド駆動電源１５から発熱抵抗体１１に電流が供給
され、画素信号に応じて発熱抵抗体１１を発熱させ、所
定の印刷を行うよう構成されている。The pixel signals read into the shift register 13 are the data signals connected to the respective heating resistors 11.
It is supplied to the drive circuit 14 including a latch circuit and a switching element such as an FET, and the drive circuit 14 is selectively driven according to a pixel signal. As a result, a current is supplied from the thermal head drive power supply 15 to the heating resistor 11, causing the heating resistor 11 to generate heat in accordance with the pixel signal and performing predetermined printing.
【００１５】発熱抵抗体１１の発熱エネルギーは、発熱
抵抗体１１の抵抗値と供給される電流および通電時間で
決まり、昇華性のインクリボン等を用い、転写濃度差を
階調表現に使用する場合、この発熱エネルギーの制御
を、通電駆動時間を調節すること等により行う。したが
って、発熱抵抗体１１の1 つの画素に欠陥が生じ、抵抗
値が増加した場合には、周辺画素に比べて発熱エネルギ
ーが小さくなるため、欠陥画素においては、所望の転写
濃度より薄くなってしまい、例えば、均一濃度において
筋状の濃度むらとなって現れる。The heat generation energy of the heat generating resistor 11 is determined by the resistance value of the heat generating resistor 11, the supplied current and the energization time. When a sublimable ink ribbon or the like is used and the transfer density difference is used for gradation expression. The heat energy is controlled by adjusting the energization drive time. Therefore, when a defect occurs in one pixel of the heating resistor 11 and the resistance value increases, the heating energy becomes smaller than that in the peripheral pixels, and the defective pixel becomes thinner than the desired transfer density. For example, in uniform density, it appears as streaky density unevenness.
【００１６】そこで、本実施例の記録装置では、以下の
ような自己診断機構が設けられており、このような発熱
抵抗体１１の欠陥あるいは劣化等を見出だすことができ
るよう構成されている。Therefore, the recording apparatus of the present embodiment is provided with the following self-diagnosis mechanism, and is constructed so that defects or deterioration of the heating resistor 11 can be found out. ..
【００１７】すなわち、サーマルヘッド駆動電源１５と
発熱抵抗体１１との間には、駆動電源切り換えリレー１
６が設けられており、発熱抵抗体１１への電力供給をサ
ーマルヘッド駆動電源１５と自己診断用定電圧回路１７
とに切り換えることができるよう構成されている。ま
た、自己診断用定電圧回路１７には、この自己診断用定
電圧回路１７から発熱抵抗体１１に供給される電流を検
出するための駆動電流検出抵抗１８が設けられている。
さらに、発熱抵抗体１１を、1 ドットずつ順次通電駆動
する手段として、シフトレジスタ１３およびドライブ回
路１４には、制御信号発生回路１９が接続されている。
そして、発熱抵抗体１１を1 ドットずつ駆動した時に生
じる駆動電流検出抵抗１８の降下電圧を、アンプ回路２
０で検出し、Ａ／Ｄ変換器２１でデジタル信号に変換
し、プリンタ制御ＣＰＵ２２に入力し、メモリに記憶す
るよう構成されている。That is, the drive power source switching relay 1 is provided between the thermal head drive power source 15 and the heating resistor 11.
6 is provided to supply electric power to the heating resistor 11 and the thermal head drive power source 15 and the self-diagnosis constant voltage circuit 17
It is configured so that it can be switched to and. Further, the self-diagnosis constant voltage circuit 17 is provided with a drive current detection resistor 18 for detecting a current supplied from the self-diagnosis constant voltage circuit 17 to the heating resistor 11.
Further, a control signal generation circuit 19 is connected to the shift register 13 and the drive circuit 14 as a means for sequentially energizing the heating resistor 11 dot by dot.
Then, the voltage drop of the drive current detection resistor 18 that occurs when the heating resistor 11 is driven dot by dot is determined by the amplifier circuit 2
It is configured to be detected by 0, converted into a digital signal by the A / D converter 21, input to the printer control CPU 22, and stored in the memory.
【００１８】プリンタ制御ＣＰＵ２２は、例えば電源オ
ン時、給紙中等の印刷を行っていない時に、駆動電源切
り換えリレー１６を切り替えて自己診断を実施し、上記
Ａ／Ｄ変換器２１の出力値を得る。この値は、発熱抵抗
体１１の抵抗値とほぼ等価であるため、本実施例の記録
装置では、Ａ／Ｄ変換器２１の出力値の差を発熱抵抗体
１１の抵抗値の差と考える。そして、プリンタ制御ＣＰ
Ｕ２２は、このＡ／Ｄ変換値により、各発熱抵抗体１１
について、隣接する画素の発熱抵抗体１１との抵抗値の
差の絶対値を求め、順次基準値と比較し、基準値より大
きい場合には、欠陥等が発生したと判断して、図示しな
い表示器への表示および動作の中断等を行う。The printer control CPU 22 performs the self-diagnosis by switching the drive power source switching relay 16 to obtain the output value of the A / D converter 21 when the power source is turned on or when printing is not performed, such as during paper feeding. .. Since this value is almost equivalent to the resistance value of the heating resistor 11, in the recording apparatus of this embodiment, the difference in the output value of the A / D converter 21 is considered to be the difference in the resistance value of the heating resistor 11. And the printer control CP
U22 uses each A / D converted value to generate each heating resistor 11
The absolute value of the difference between the resistance value of the adjacent pixel and the heating resistor 11 is calculated, and compared sequentially with the reference value. If the difference is larger than the reference value, it is determined that a defect or the like has occurred, and a display not shown is shown. Display on the display and interrupt the operation.
【００１９】このように、本実施例の記録装置では、各
発熱抵抗体１１の抵抗値を測定し、隣接する画素の発熱
抵抗体１１との抵抗値の差の絶対値を求め、基準値と比
較することにより欠陥等の発生を診断するので、発熱抵
抗体１１全体として例えば20％程度の初期の抵抗値のば
らつきがあったとしても、これにかかわらず発熱抵抗体
１１の抵抗値の増大を検知することができ、従来に較べ
て記録画質に影響するような発熱抵抗体１１の欠陥ある
いは劣化等を精度良く検出することができる。なお、上
記実施例では、隣接する発熱抵抗体１１の抵抗値の差の
絶対値を求めたが、高画質を要求される記録装置では、
初期の抵抗値のばらつきの抵抗値の差を補償するため、
例えば、発熱抵抗体１１毎に通電時間を制御し、記録濃
度の差を小さくすることを行っており、このような場合
では、初期における隣接する画素の発熱抵抗体１１の抵
抗値の差の大きいものも容認してしまうため、抵抗値の
差の基準値を大きくとらざるをえないという問題が生じ
てしまう。As described above, in the recording apparatus of this embodiment, the resistance value of each heating resistor 11 is measured, the absolute value of the difference between the resistances of the adjacent pixels and the heating resistor 11 is calculated, and the absolute value of the difference is used as the reference value. Since the occurrence of defects and the like is diagnosed by comparison, even if there is a variation in the initial resistance value of about 20% for the entire heating resistor 11, the resistance value of the heating resistor 11 can be increased regardless of this. It is possible to detect the defect, and it is possible to detect the defect or deterioration of the heating resistor 11 that affects the recording image quality more accurately than in the conventional case. In the above embodiment, the absolute value of the difference between the resistance values of the adjacent heating resistors 11 was obtained. However, in a recording device that requires high image quality,
In order to compensate for the difference in resistance value due to variations in initial resistance value,
For example, the energization time is controlled for each heating resistor 11 to reduce the difference in recording density. In such a case, the difference in resistance value between the heating resistors 11 of adjacent pixels in the initial stage is large. Since the object is also accepted, there arises a problem that the reference value of the difference in resistance value has to be large.
【００２０】このような場合は、例えば図２に示すよう
に、全発熱抵抗体１１の初期の抵抗値を、ＲＯＭ３０等
のメモリに記憶させておき、プリンタ制御ＣＰＵ２２に
取り込まれたＡ／Ｄ変換値から求めた抵抗値と初期の抵
抗値との差の絶対値を、先の実施例と同様に順次基準値
と比較していき、基準値より大きい場合には、欠陥が発
生したと判断するよう構成する。これにより、発熱抵抗
体１１の欠陥あるいは劣化等を、発熱抵抗体１１の初期
の抵抗値のばらつきに影響されずに従来に較べて精度良
く検出することができる。In such a case, for example, as shown in FIG. 2, the initial resistance values of all the heating resistors 11 are stored in a memory such as the ROM 30 and the A / D conversion is taken into the printer control CPU 22. The absolute value of the difference between the resistance value obtained from the value and the initial resistance value is sequentially compared with the reference value in the same manner as in the previous embodiment, and if it is larger than the reference value, it is determined that a defect has occurred. Configure as follows. As a result, defects or deterioration of the heating resistor 11 can be detected more accurately than before without being affected by variations in the initial resistance value of the heating resistor 11.
【００２１】[0021]
【発明の効果】以上説明したように、本発明の記録装置
によれば、記録画質に影響するような発熱抵抗体の欠陥
あるいは劣化等を、発熱抵抗体の初期の抵抗値のばらつ
きに影響されずに従来に較べて精度良く検出することが
でき、信頼性の向上を図ることができる。As described above, according to the recording apparatus of the present invention, the defect or deterioration of the heating resistor that affects the recording image quality is affected by the variation in the initial resistance value of the heating resistor. Instead, the detection can be performed more accurately than in the conventional case, and the reliability can be improved.
【図１】本発明の一実施例の記録装置の要部構成を示す
図。FIG. 1 is a diagram showing a main configuration of a recording apparatus according to an embodiment of the present invention.
【図２】本発明の他の実施例の記録装置の要部構成を示
す図。FIG. 2 is a diagram showing a main configuration of a recording apparatus according to another embodiment of the present invention.
１０ サーマルヘッド １１ 発熱抵抗体 １２ 画素信号入力端子 １３ シフトレジスタ １４ ドライブ回路 １５ サーマルヘッド駆動電源 １６ 駆動電源切り換えリレー １７ 自己診断用定電圧回路 １８ 駆動電流検出抵抗 １９ 制御信号発生回路 ２０ アンプ回路 ２１ Ａ／Ｄ変換器 ２２ プリンタ制御ＣＰＵ 10 Thermal Head 11 Heating Resistor 12 Pixel Signal Input Terminal 13 Shift Register 14 Drive Circuit 15 Thermal Head Drive Power Supply 16 Drive Power Supply Switching Relay 17 Self-Diagnosis Constant Voltage Circuit 18 Drive Current Detection Resistor 19 Control Signal Generation Circuit 20 Amplifier Circuit 21 A / D converter 22 Printer control CPU
Claims (2)
と、 前記発熱抵抗体に選択的に通電し、駆動することによ
り、記録のための熱エネルギーを発生させる通電制御手
段と、 前記発熱抵抗体を自己診断のために順次通電駆動する診
断用駆動手段と、 前記診断用駆動手段による通電駆動時に各発熱抵抗体の
抵抗値を測定する抵抗値測定手段と、 前記抵抗値測定手段によって測定された各々隣接する前
記発熱抵抗体の抵抗値の差を比較して該発熱抵抗体の良
否を判定する手段とを具備したことを特徴とする記録装
置。1. A plurality of heating resistors arranged regularly, an energization control unit for generating thermal energy for recording by selectively energizing and driving the heating resistors, and the heating resistor. Is sequentially driven for self-diagnosis by a driving means for diagnosis, a resistance value measuring means for measuring a resistance value of each heating resistor at the time of energization driving by the driving means for diagnosis, and a resistance value measuring means. A recording apparatus, comprising means for comparing the resistance values of the heating resistors adjacent to each other to determine the quality of the heating resistors.
と、 前記発熱抵抗体に選択的に通電し、駆動することによ
り、記録のための熱エネルギーを発生させる通電制御手
段と、 前記発熱抵抗体を自己診断のために順次通電駆動する診
断用駆動手段と、 前記診断用駆動手段による通電駆動時に各発熱抵抗体の
抵抗値を測定する抵抗値測定手段と、 前記各発熱抵抗体の初期の抵抗値を記憶する記憶手段
と、 前記抵抗値測定手段によって測定された結果と、前記記
憶手段に記憶された初期の抵抗値とを比較して該発熱抵
抗体の良否を判定する手段とを具備したことを特徴とす
る記録装置。2. A plurality of heating resistors arranged regularly, an energization control unit for generating thermal energy for recording by selectively energizing and driving the heating resistors, and the heating resistor. Diagnostic drive means for sequentially energizing for self-diagnosis, resistance value measuring means for measuring the resistance value of each heating resistor during energization driving by the diagnosing driving means, and the initial resistance of each heating resistor A storage unit for storing a value; and a unit for comparing the result measured by the resistance value measuring unit with the initial resistance value stored in the storage unit to determine the quality of the heating resistor. A recording device characterized by the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3342995A JPH05169707A (en) | 1991-12-25 | 1991-12-25 | Recording apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3342995A JPH05169707A (en) | 1991-12-25 | 1991-12-25 | Recording apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05169707A true JPH05169707A (en) | 1993-07-09 |
Family
ID=18358127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3342995A Withdrawn JPH05169707A (en) | 1991-12-25 | 1991-12-25 | Recording apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05169707A (en) |
-
1991
- 1991-12-25 JP JP3342995A patent/JPH05169707A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990311 |