JPS6019560A - Thermal head driving system - Google Patents
Thermal head driving systemInfo
- Publication number
- JPS6019560A JPS6019560A JP58127186A JP12718683A JPS6019560A JP S6019560 A JPS6019560 A JP S6019560A JP 58127186 A JP58127186 A JP 58127186A JP 12718683 A JP12718683 A JP 12718683A JP S6019560 A JPS6019560 A JP S6019560A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- recorded
- data
- thermal head
- 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.)
- Granted
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
- B41J2/375—Protection arrangements against overheating
Landscapes
- Electronic Switches (AREA)
Abstract
Description
【発明の詳細な説明】
技術分野
本発明は、ファクシミリ等の感熱記録装置におけるサー
マルヘッド駆動方式、より詳細には、過温時におけるサ
ーマルヘッドの保護ドライブ方式サーマルヘッドを用い
たファクシミリ、プリンタ等は周知であるが、これらに
おいてサーマルヘッドの温度が高くなると、区像濃度が
高くなり、そのような状態において更に黒画像を記録す
ると、ヘッドの温度が更に上昇し、記録画像が更に黒化
してしまう。Detailed Description of the Invention Technical Field The present invention relates to a thermal head drive system in a thermal recording device such as a facsimile, and more specifically, a drive system for protecting the thermal head during overtemperatures. As is well known, when the temperature of the thermal head increases in these systems, the image density increases, and if a black image is further recorded in such a state, the temperature of the head further increases and the recorded image becomes even darker. .
目 的
本発明は、上述のごとき従来技術の問題点を解決するた
めになされたもので、特に、サーマルヘッドの温度が所
定温度以上の時は、その前後の記録情報及び既に記録し
た前ラインの記録情報等を考慮して記録する黒画像を効
果的に少なくし、もって、ヘッドの温度上昇を抑えると
ともに、記録画像の画像了解性の改善を図ったものであ
る。Purpose The present invention has been made to solve the problems of the prior art as described above. In particular, when the temperature of the thermal head is higher than a predetermined temperature, the recorded information before and after that and the previously recorded previous line are This is intended to effectively reduce the number of black images to be recorded in consideration of recording information, thereby suppressing the temperature rise of the head, and improving the image intelligibility of the recorded image.
監−一腹
本発明の構成について、以下、実施例に基づいて説明す
る。DETAILED DESCRIPTION OF THE INVENTION The structure of the present invention will be described below based on examples.
第１図及び第２図は、それぞれ本発明の詳細な説明する
ための構成図で、図中、１はシフトレジスタ、２はラッ
チ回路、Ｒ１〜Ｒｍは発熱抵抗体、Ｔ１〜Ｔ５は温度検
出器、３はカウンター、４はデコーダで、第１図は温度
検出器が１個（Ｔ１のみ）の場合、第２図は複数個（Ｔ
ｚ〜Ｔ５）の場合を示す。1 and 2 are configuration diagrams for explaining the present invention in detail, respectively. In the figures, 1 is a shift register, 2 is a latch circuit, R1 to Rm are heating resistors, and T1 to T5 are temperature detection 3 is a counter, and 4 is a decoder. Figure 1 shows one temperature detector (T1 only), and Figure 2 shows multiple temperature detectors (T1 only).
z~T5) is shown.
第３図は、ヘッド部の側面構成図で、図中、ＩＯはプラ
テンローラ、１１はセラミックベースサーマルヘッド、
Ｒは発熱抵抗体、Ｔは温度検出器で、本発明においては
、該温度検出器によってサーマルヘッドの温度を検出し
、該サーマルヘッドの温度が所定温度例えば６０°以上
になった時に、発熱抵抗体を後述の方法で駆動するよう
にして良質の画像を保持しつつヘッドの温度上昇を抑制
するようにしたものである。FIG. 3 is a side configuration diagram of the head section, in which IO is a platen roller, 11 is a ceramic base thermal head,
R is a heating resistor, and T is a temperature detector. In the present invention, the temperature of the thermal head is detected by the temperature detector, and when the temperature of the thermal head reaches a predetermined temperature, for example, 60° or higher, the heating resistor The head is driven in a manner to be described later, thereby suppressing the rise in temperature of the head while maintaining a high quality image.
第４図は、本発明によるヘッド駆動方法の一実施例を説
明するための図で、（ａ）はシステムから送られてくる
画情報、（ｂ）は実際に記録されるべき画情で、Ｘは主
走査方向、■は副走査方向を表わしており、ｐ’ （ｘ
、ｙ）は、今、実際に記録しようとしているデータ、ｐ
（ｘ、ｙ）はＰ’（ｘ、ｙ）に対応したデータでシステ
ム、ファクシミリ等においては相手側送信機から送られ
てくるデータ、Ｐ （Ｘ＋１．Ｙ）はＰ（Ｘ、Ｙ）と同
一の主走査線上にあって該ｐ（ｘ、ｙ）より１ビツト前
の隣接データ、Ｐ（Ｘ−１，Ｙ）はＰ（ｘ、ｙ）と同一
の主走査線上にあって該ｐ（ｘ、。FIG. 4 is a diagram for explaining an embodiment of the head driving method according to the present invention, in which (a) is image information sent from the system, (b) is image information to be actually recorded, X represents the main scanning direction, ■ represents the sub-scanning direction, and p' (x
, y) is the data that is currently being recorded, p
(x, y) is the data corresponding to P'(x, y), which is sent from the other party's transmitter in the system, facsimile, etc., and P (X+1.Y) is the same as P(X, Y). Adjacent data P(X-1, Y) is on the same main scanning line as P(x, y) and is one bit before the p(x, y). ,.
■）より１ビツト後の隣接データ、Ｐ’（Ｘ、Ｙ−１）
は既に記録されている主走査方向に同一アドレスの直前
記録データで、サーマルヘッドが所定温度以上になった
場合、記録すべきデータＰ′（ｘ、ｙ）は、システムか
ら入力されてくるデータｐ （ｘ、ｙ）をその前後のデ
ータ（ｐ、（ｘ＋ｉ。Adjacent data 1 bit after ■), P'(X, Y-1)
is the previous recorded data at the same address in the main scanning direction that has already been recorded, and when the thermal head reaches a predetermined temperature or higher, the data P'(x, y) to be recorded is the data p input from the system. (x, y) and the data before and after it (p, (x+i).
Ｙ）、Ｐ （Ｘ−１，Ｙ））及び主走査方向に同一アド
レスの直前記録データＣＰ’ （Ｘ、Ｙ−１））等を考
慮して、
Ｐ′（Ｘ、Ｙ） ＝ Ｐ（Ｘ、Ｙ）ＣＰ（Ｘ−１，Ｙ）
＋ Ｐ（Ｘ＋１．Ｙ） ＋ Ｐ’ （Ｘ、Ｙ−１））
により決定するようにしたものである。すなわち、サー
マルヘッドの温度が所定温度以上の時は、Ｐ’ （Ｘ、
Ｙ−１）、Ｐ （Ｘ−１，Ｙ）、Ｐ （Ｘ＋１、■）が
黒でないことを条件に入力データＰ（ｘ、ｙ）を記録す
るようにし、もって、黒率を低下させてヘッドの温度上
昇を抑え、かつ、画像了解性の向上を図ったものである
。P'(X, Y) = P(X ,Y)CP(X-1,Y)
+ P (X+1.Y) + P' (X, Y-1))
This is determined by the following. That is, when the temperature of the thermal head is higher than a predetermined temperature, P' (X,
The input data P(x, y) is recorded on the condition that Y-1), P (X-1, Y), P (X+1, ■) are not black, thereby reducing the black rate and The aim is to suppress the temperature rise in the image and improve image intelligibility.
効 果
以上の説明から明らかなように、本発明によると、ヘッ
ドの過熱を抑制することがでるとともに、消費電力の低
減化を図ることができ、また、画像了解性の改善を図る
ことができる。また、サーマルヘッドの過負荷駆動は極
めてまれなケースであるが、本発明を適用することによ
り、放熱、電源−容量等に対して冗長設計を行う必要は
無く、装置の小型化、低価格化を図ることができる。Effects As is clear from the above description, according to the present invention, overheating of the head can be suppressed, power consumption can be reduced, and image intelligibility can be improved. . In addition, although overload driving of a thermal head is extremely rare, by applying the present invention, there is no need for redundant design for heat dissipation, power supply capacity, etc., and the device can be made smaller and lower in price. can be achieved.
第１図及び第２図は、それぞれ本発明が適用された感熱
記録装置の例を示す要部構成図、第３図は、サーマルヘ
ッド部の側面構成図、第４図は、本発明によるサーマル
ヘッド駆動方法の一例を説明するための図である。
１・・・シフトレジスタ、２・・・ラッチ回路、Ｒ１〜
Ｒｍ・・・発熱抵抗体、Ｔ１〜Ｔｓ・・・温度検出器、
３・・・カウンター、４・・・デコーダ。
第３図
第４図1 and 2 are main part configuration diagrams showing an example of a thermal recording device to which the present invention is applied, FIG. 3 is a side configuration diagram of a thermal head section, and FIG. 4 is a thermal recording device according to the present invention. FIG. 3 is a diagram for explaining an example of a head driving method. 1...Shift register, 2...Latch circuit, R1~
Rm...heating resistor, T1-Ts...temperature detector,
3...Counter, 4...Decoder. Figure 3 Figure 4
Claims (1)
ジスタの状態を保持するラッチ手段と、前記シフトレジ
スタより導かれるデータのシリアルアウト手段とを有す
る感熱記録装置において、予め定められた温度領域では
、前記シフトレジスタへの入力データｐ’ （ｘ、ｙ）
は、 Ｐ’ （Ｘ、Ｙ） ＝ Ｐ（Ｘ、Ｙ）（Ｐ（Ｘ−１，Ｙ
） ＋ Ｐ（Ｘ＋１．’ｉ＋） ＋ Ｐ’ （Ｘ、Ｙ−
１））により決定されることを特徴とするサーマルヘッ
ド駆動方式〔ただし、ｐ （ｘ＋ｉ、ｙ）は同一主走査
線上のｐ （ｘ、ｙ）の１つ前に隣接した画情報、Ｐ（
Ｘ−１，Ｙ）は同一主走査線上のｐ （ｘ。 ■）の１つ後に隣接した画情報、Ｐ’ （Ｘ、Ｙ−１）
のは既に記録されている主走査方向に同一アドレスの直
前の記録データ）。[Claims] A thermal recording device comprising a shift register for receiving print information, a latch means for holding the state of the register in the shift 1, and a serial output means for serially outputting data led from the shift register. In the temperature range, the input data to the shift register p' (x, y)
is P' (X, Y) = P(X, Y) (P(X-1, Y
) + P(X+1.'i+) + P'(X, Y-
1)) [where p (x+i, y) is image information immediately preceding p (x, y) on the same main scanning line, P (
X-1, Y) is the image information next to p (x. ■) on the same main scanning line, P' (X, Y-1)
(This is the previous recorded data at the same address in the main scanning direction that has already been recorded.)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58127186A JPS6019560A (en) | 1983-07-13 | 1983-07-13 | Thermal head driving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58127186A JPS6019560A (en) | 1983-07-13 | 1983-07-13 | Thermal head driving system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6019560A true JPS6019560A (en) | 1985-01-31 |
| JPH041701B2 JPH041701B2 (en) | 1992-01-14 |
Family
ID=14953805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58127186A Granted JPS6019560A (en) | 1983-07-13 | 1983-07-13 | Thermal head driving system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6019560A (en) |
-
1983
- 1983-07-13 JP JP58127186A patent/JPS6019560A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH041701B2 (en) | 1992-01-14 |
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