JPS6333467B2 - - Google Patents
Info
- Publication number
- JPS6333467B2 JPS6333467B2 JP11107280A JP11107280A JPS6333467B2 JP S6333467 B2 JPS6333467 B2 JP S6333467B2 JP 11107280 A JP11107280 A JP 11107280A JP 11107280 A JP11107280 A JP 11107280A JP S6333467 B2 JPS6333467 B2 JP S6333467B2
- Authority
- JP
- Japan
- Prior art keywords
- thermal recording
- temperature
- group
- recording
- selection drive
- 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
- 238000000034 method Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000001454 recorded image Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000000758 substrate Substances 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
- B41J2/35—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 providing current or voltage to the thermal head
- B41J2/355—Control circuits for heating-element selection
-
- 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
- B41J2/35—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 providing current or voltage to the thermal head
- B41J2/355—Control circuits for heating-element selection
- B41J2/36—Print density control
- B41J2/365—Print density control by compensation for variation in temperature
Landscapes
- Electronic Switches (AREA)
- Facsimile Heads (AREA)
Description
【発明の詳細な説明】 本発明は感熱記録方法に関する。[Detailed description of the invention] The present invention relates to a thermal recording method.
一般に感熱記録方法は、現像・定着装置が不要
となるため、装置全体を非常にコンパクト、か
つ、安価に構成し得る利点があるが、その反面熱
が感熱記録ヘツドに蓄積され易い欠点がある。 In general, thermal recording methods do not require a developing/fixing device, so they have the advantage of making the entire device very compact and inexpensive, but on the other hand, they have the disadvantage that heat tends to accumulate in the thermal recording head.
従来、この感熱記録ヘツドの蓄熱を防止するた
め、そのヘツドの基板上に温度検出器を取り付
け、温度に応じて、感熱記録ヘツドに加える駆動
電圧あるいは駆動パルス幅を制御していた。 Conventionally, in order to prevent heat accumulation in the heat-sensitive recording head, a temperature detector was attached to the substrate of the head, and the drive voltage or drive pulse width applied to the heat-sensitive recording head was controlled in accordance with the temperature.
しかし、この方法では、記録すべき黒画素が多
くなると、感熱記録ヘツドの温度が急激に上昇
し、その結果、駆動電圧あるいは駆動パルス幅が
極端に狭くなり、記録紙が発色せず、画像が失わ
れる欠点があつた。 However, with this method, when the number of black pixels to be recorded increases, the temperature of the thermal recording head rises rapidly, and as a result, the drive voltage or drive pulse width becomes extremely narrow, the recording paper does not develop color, and the image is There were flaws that were lost.
本発明は、画像が失われることなく、感熱記録
ヘツドの蓄熱を防止し、常に良好な記録動作が行
われる感熱記録方法を提供することを目的とす
る。 SUMMARY OF THE INVENTION An object of the present invention is to provide a heat-sensitive recording method that prevents heat accumulation in a heat-sensitive recording head and always performs a good recording operation without causing image loss.
この目的を達成するため、本発明は、感熱記録
ヘツドを駆動する各駆動回路を所定間隔毎の複数
のグループにグループ分けしておき、感熱記録ヘ
ツドの温度に応じてこれら各グループの駆動源を
オン・オフするようにしたことを特徴とする。 In order to achieve this object, the present invention divides each drive circuit for driving a thermal recording head into a plurality of groups at predetermined intervals, and controls the driving sources for each group according to the temperature of the thermal recording head. It is characterized by being turned on and off.
以下、本発明の実施例を図に基づき説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明の一実施例を示す感熱記録装置
の回路構成図で、１は感熱記録素子である。 FIG. 1 is a circuit diagram of a heat-sensitive recording device showing an embodiment of the present invention, and numeral 1 indicates a heat-sensitive recording element.
この感熱記録素子１は記録ヘツド上に、例え
ば、記録紙B4サイズに記録を行う場合は、2048
個配列される。また、この記録素子１は、例え
ば、８個毎の群に分割されて、それぞれ256個の
群選択駆動回路２に接続される。更に、各群にお
ける８個の記録素子１は、廻り込み防止用ダイオ
ード３を介して、共通の８個の素子選択駆動回路
４に接続される。 This thermal recording element 1 is placed on the recording head, for example, when recording on B4 size recording paper, 2048
Arranged in pieces. Further, this recording element 1 is divided into groups of, for example, every eight elements, and each of the recording elements 1 is connected to 256 group selection drive circuits 2. Further, the eight recording elements 1 in each group are connected to a common eight element selection drive circuit 4 via a wraparound prevention diode 3.
記録時には、ブロツクカウンタ５に入力する１
個のパルスａに応じて、デコーダ６を介して１個
の群選択駆動回路２が選択駆動される。同時にシ
フトレジスタ７にシフトクロツクｂと共に入力す
る８ビツトの画信号ｃによりアンドゲート８が選
択され、パルス発生回路９に入力する記録タイミ
ング信号ｄにより、所定パルス幅時間８個の素子
選択駆動回路４が選択駆動される。 When recording, 1 is input to block counter 5.
One group selection drive circuit 2 is selectively driven via the decoder 6 in response to the three pulses a. At the same time, the AND gate 8 is selected by the 8-bit image signal c inputted to the shift register 7 together with the shift clock b, and the recording timing signal d inputted to the pulse generation circuit 9 selects the 8 elements selection drive circuit 4 for a predetermined pulse width time. Selection driven.
この結果、所定の群における８個の記録素子１
が画信号に応じて駆動される。更に、このように
動作が256回繰り返されることにより、１ライン
分の記録動作が行われる。 As a result, eight recording elements 1 in a given group
is driven according to the image signal. Further, by repeating this operation 256 times, one line worth of recording operation is performed.
以上は、感熱記録装置として従来公知のもので
あるが、本実施例においては、この感熱記録装置
における各群選択駆動回路２を１つ置きに接続し
て成る２つのグループ１０，１１に分割し、一方
のグループ１０は直接電源１２に接続する一方、
他方のグループ１１はバイメタル１３を介して電
源１２に接続した点に特徴を有する。 The above is a conventionally known thermal recording device, but in this embodiment, the thermal recording device is divided into two groups 10 and 11 in which every other group selection drive circuit 2 is connected. , one group 10 is connected directly to the power supply 12, while
The other group 11 is characterized in that it is connected to a power source 12 via a bimetal 13.
このバイメタル１３は感熱記録ヘツド上あるい
はその近くに配置され、所定温度以上になつたと
きオフし、電源１２からグループ１１への電力の
供給を停止する。 This bimetal 13 is placed on or near the thermal recording head, and is turned off when the temperature exceeds a predetermined temperature, stopping the supply of power from the power source 12 to the group 11.
従つて、上述したように記録動作中、感熱記録
ヘツドが所定温度になると、グループ１１の各駆
動回路の動作が停止する結果、動作する素子の数
がそれ迄の半分以下になり、感熱記録ヘツドの温
度上昇が防止される。また、感熱記録ヘツドが所
定温度以上になつても、８個置きには記録が行わ
れる結果、記録画の消失は防止される。 Therefore, as mentioned above, when the thermal recording head reaches a predetermined temperature during the recording operation, the operation of each drive circuit in group 11 is stopped, and as a result, the number of operating elements is reduced to less than half of the previous one, and the thermal recording head temperature rise is prevented. Further, even if the temperature of the heat-sensitive recording head exceeds a predetermined temperature, recording is performed every eighth head, thereby preventing the recorded images from disappearing.
ところで、上記実施例の場合には、画信号が８
ビツト毎に間引かれることになるが、これを１ビ
ツト毎に間引くようにすることもできる。 By the way, in the case of the above embodiment, the image signal is 8
Although the data is thinned out bit by bit, it is also possible to thin out the data bit by bit.
第２図はそのための一実施例を示す感熱記録装
置の回路構成図である。 FIG. 2 is a circuit diagram of a thermal recording device showing an embodiment for this purpose.
図中、第１図と同一符号は同一部分を示し、第
１図の構成と異なる点は、素子選択駆動回路４側
を２つのグループ１４，１５に分割し、グループ
１４はバイメタル１３を介して接地した点であ
る。 In the figure, the same reference numerals as in FIG. 1 indicate the same parts, and the difference from the configuration in FIG. This is the point where it touched the ground.
感熱記録装置をこのように構成した場合には、
感熱記録ヘツドの温度上昇に伴つて、１ビツト置
きの画信号の間引きが行われてヘツドの温度を所
定値以下に下げる。 When the thermal recording device is configured in this way,
As the temperature of the thermal recording head increases, every other bit of the image signal is thinned out to lower the temperature of the head to a predetermined value or less.
勿論、ヘツドの温度が所定値以下になれば、元
通りの記録動作が行われることは云う迄もない。 Of course, if the temperature of the head falls below a predetermined value, the recording operation will resume as before.
ところで、感熱記録装置における各記録素子１
の駆動方法としては種々の方法が存在するが、本
発明はその駆動方法の如何を問わず極めて簡単な
回路変更だけで、既設の装置にも適用し得るもの
であり、また、そのときの感熱記録ヘツドの温度
上昇に応じて駆動回路を選択的に動作させる回路
としても種々のものを採用し得るものである。 By the way, each recording element 1 in a thermal recording device
There are various methods for driving the Various types of circuits may be employed for selectively operating the drive circuit in accordance with the temperature rise of the recording head.
第３図はその一例を示したもので、図中、第１
図と同一符号は同一又は相当部分を示す。 Figure 3 shows an example of this.
The same reference numerals as in the figures indicate the same or corresponding parts.
この実施例の場合には、2048個の感熱記録素子
１が８個毎の256個の群に分けられる点は上述実
施例同様であるが、その256個の群が更に４個の
組に分けられ、各組における各群は共通の４個の
群選択駆動回路２に接続される一方、各組毎に各
群の各８個の記録素子１は共通の８個毎の素子選
択駆動回路４に接続される。従つて、素子選択駆
動回４は合計64個設けられ、シフトレジスタ７に
入力する64ビツトの画信号ｃに応じて３群置きに
８個ずつ記録素子が駆動されていくことになる。 In this embodiment, the 2048 thermosensitive recording elements 1 are divided into 256 groups of 8, as in the above embodiment, but the 256 groups are further divided into 4 groups. Each group in each set is connected to a common four group selection drive circuit 2, while each of the eight recording elements 1 of each group for each set is connected to a common every eight element selection drive circuit 4. connected to. Therefore, a total of 64 element selection drive circuits 4 are provided, and eight recording elements are driven in every third group in response to the 64-bit image signal c input to the shift register 7.
このような駆動方法を採用した感熱記録装置に
おける各群選択駆動回路２を前述実施例同様１つ
置きのグループ１６，１７に分割し、グループ１
６は直接、グループ１７はサーミスタＳ、前段増
幅回路Ａ、主増幅回路A2から成る温度制御回路
１８を介して電源１２に接続しても、前述実施例
同様の作用効果が得られる。 Each group selection drive circuit 2 in a thermal recording apparatus employing such a drive method is divided into every other group 16 and 17 as in the above embodiment, and group 1
Even if group 6 is connected directly to power supply 12, and group 17 is connected to power supply 12 through temperature control circuit 18 consisting of thermistor S, front stage amplifier circuit A, and main amplifier circuit A2 , the same effects as in the previous embodiment can be obtained.
尚、温度制御回路１８は、そのサーミスタＳが
感熱記録ヘツド上に配置され、ヘツドが所定温度
に達すると、前段増幅回路A1がオフされ、これ
により、回路A2によるグループ１７と電源１２
との接続をオフするものである。 In the temperature control circuit 18, the thermistor S is placed on the thermal recording head, and when the head reaches a predetermined temperature, the front stage amplifier circuit A1 is turned off.
This is to turn off the connection.
更に、この実施例の場合も第４図に示すよう
に、前述同様、素子選択駆動回路４側を２つのグ
ループ１９，２０に分割し、グループ１９は温度
制御回路１８を介して接地するようにしても、上
記実施例同様の作用効果が得られる。 Furthermore, in this embodiment, as shown in FIG. 4, the element selection drive circuit 4 side is divided into two groups 19 and 20, and the group 19 is grounded via the temperature control circuit 18. However, the same effects as in the above embodiment can be obtained.
尚、以上の実施例ではいずれも感熱記録ヘツド
の所定温度以上の上昇に対し、記録動作を正常時
の半分に間引く２値動作について説明したが、群
選択駆動回路あるいは素子選択駆動回路のグルー
プ分けを複数にすることにより感熱記録ヘツドの
温度上昇に伴い画信号の間引きを多値に制御する
ことも可能である。 Incidentally, in the above embodiments, a binary operation was explained in which the recording operation is halved to the normal level when the temperature of the thermal recording head rises above a predetermined temperature. By using a plurality of values, it is also possible to control the thinning of the image signal in multiple values as the temperature of the thermal recording head increases.
以上のように、本発明によれば、簡単な回路構
成で感熱記録ヘツドの温度が上昇しても、記録画
が消失することなく、所定温度以下に下げること
ができ、この結果、感熱記録ヘツドの焼損を防止
すると共に、常に良好な記録画が得られるように
なる。しかも、既設の感熱記録装置にも極めて簡
単な回路変更だけで本発明を適用することができ
る。 As described above, according to the present invention, even if the temperature of the thermal recording head increases with a simple circuit configuration, the temperature can be lowered to a predetermined level or below without causing the recorded image to disappear. In addition to preventing burnout, good recorded images can always be obtained. Furthermore, the present invention can be applied to existing thermal recording devices by only making extremely simple circuit changes.
第１図乃至第４図は本発明の各実施例を示す感
熱記録装置の回路構成図である。
１……感熱記録素子、２……群選択駆動回路、
３……廻り込み防止用ダイオード、４……素子選
択駆動回路、５……ブロツクカウンタ、６……デ
コーダ、７……シフトレジスタ、８……アンドゲ
ート、９……パルス発生回路、１２……直接電
源、１３……バイメタル、１８……温度制御回
路。
1 to 4 are circuit configuration diagrams of a thermal recording apparatus showing each embodiment of the present invention. 1...Thermosensitive recording element, 2...Group selection drive circuit,
3... Diode for loop prevention, 4... Element selection drive circuit, 5... Block counter, 6... Decoder, 7... Shift register, 8... AND gate, 9... Pulse generation circuit, 12... Direct power supply, 13...bimetal, 18...temperature control circuit.
Claims (1)
回路との動作の組み合わせにより、感熱記録ヘツ
ドの各感熱記録素子が順次選択的に駆動され、１
ライン分の画信号の記録が行なわれる感熱記録方
法において、上記群選択駆動回路および素子選択
駆動回路の少なくとも一方を複数のグループに分
割し、そのグループを感熱記録ヘツドの温度に応
じて選択的に動作、停止させることを特徴とする
感熱記録方法。1. Each thermal recording element of the thermal recording head is sequentially and selectively driven by a combination of operations of a plurality of group selection drive circuits and a plurality of element selection drive circuits.
In a thermal recording method in which image signals for lines are recorded, at least one of the group selection drive circuit and the element selection drive circuit is divided into a plurality of groups, and the groups are selectively divided according to the temperature of the thermal recording head. A thermal recording method characterized by operating and stopping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11107280A JPS5736680A (en) | 1980-08-14 | 1980-08-14 | Heat-sensitive recording system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11107280A JPS5736680A (en) | 1980-08-14 | 1980-08-14 | Heat-sensitive recording system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5736680A JPS5736680A (en) | 1982-02-27 |
| JPS6333467B2 true JPS6333467B2 (en) | 1988-07-05 |
Family
ID=14551663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11107280A Granted JPS5736680A (en) | 1980-08-14 | 1980-08-14 | Heat-sensitive recording system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5736680A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6034877A (en) * | 1983-08-08 | 1985-02-22 | Canon Inc | Image-forming device |
| JPS6034878A (en) * | 1983-08-08 | 1985-02-22 | Canon Inc | Image-forming device |
| WO2011030410A1 (en) | 2009-09-09 | 2011-03-17 | 株式会社 東芝 | Memory device |
-
1980
- 1980-08-14 JP JP11107280A patent/JPS5736680A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5736680A (en) | 1982-02-27 |
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