JPS60242074A - Thermal head controller - Google Patents

Thermal head controller

Info

Publication number
JPS60242074A
JPS60242074A JP59099225A JP9922584A JPS60242074A JP S60242074 A JPS60242074 A JP S60242074A JP 59099225 A JP59099225 A JP 59099225A JP 9922584 A JP9922584 A JP 9922584A JP S60242074 A JPS60242074 A JP S60242074A
Authority
JP
Japan
Prior art keywords
energization time
time
thermal head
energization
recording
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
Application number
JP59099225A
Other languages
Japanese (ja)
Inventor
Akira Nakano
彰 中野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP59099225A priority Critical patent/JPS60242074A/en
Publication of JPS60242074A publication Critical patent/JPS60242074A/en
Pending legal-status Critical Current

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
    • B41J2/35—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

Landscapes

  • Electronic Switches (AREA)
  • Facsimile Heads (AREA)
  • Fax Reproducing Arrangements (AREA)

Abstract

PURPOSE:To prevent stringing and collapse and discontinuity of density in a recording image by changing the energization time by a specified small time in such a way to reduce the difference from the reference energization time set according to the energization time specified in the preceding line and the temperature of a thermal head. CONSTITUTION:Each time one line of recording ends, a CPU11 receives temperature information of a thermal head 1 through an input port 18 and reads out the reference energization time P according to the temperature information from an energization time ROM14. Then, the CPU11 reads the energization time Q in the preceding line out of a RAM13 and when P<Q, a recording is performed for the time as obtained by subtracting a preset small time DELTAR from the energization time Q while when P>Q, it is done for the time as obtained by adding DELTAR to the energization time Q.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は、感熱ヘッドの通電時ＮＩを可変して記録濃度
を制御する感熱ヘッド制御装置の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a thermal head control device that controls recording density by varying NI during energization of a thermal head.

〔発明の技術的背景〕[Technical background of the invention]

従来、この種の装置として次のようなものがある。第１
図はその信成を示すブロック図である。この装置は、感
熱ヘッドノに記録データ送出部２から記録ｒ−夕を供給
するとともに通電時間設定部３から通電信号を供給し、
この通電信号で指定した時間だけヘッドを通電駆動して
上記記録データの濃度を制御するようにしている。また
、感熱へラド１に例えばサーミスタからなる温度検出器
４を設け、この温度検出器４で検出された温度情報をψ
変換器５でデジタル信号に変換して基準通電時間設定部
６に導びいているロセして、この基準ａｍ時間設定部６
で上記温度情報に応じた基準３１！ｉ電時間情報を発、
生して通電時間設定ｓ３に導ひき、この通電時間設定部
３において所定のタイミング毎に感熱へラド１に指定す
る通電時間？上記基準通電時間に設定変更するようにし
ている。Conventionally, there are the following devices as this type of device. 1st
The figure is a block diagram showing its configuration. This device supplies the recording data from the recording data sending section 2 to the thermal head, and also supplies the energization signal from the energization time setting section 3.
The head is energized and driven for a time specified by this energization signal to control the density of the recorded data. In addition, a temperature detector 4 made of a thermistor, for example, is provided on the heat sensitive heater 1, and the temperature information detected by this temperature detector 4 is transmitted to ψ
The converter 5 converts the signal into a digital signal and leads it to the standard energization time setting section 6.
Standard 31 according to the above temperature information! Emit i-den time information,
The energization time setting unit 3 sets the energization time to the heat sensitive electrode 1 at each predetermined timing. The setting is changed to the above standard energization time.

ところで、このような従来の装置では、上記通電時間の
設定変更のタイミングを、例えば（１〕　記録紙１枚分
のデータの記録開始時点毎。By the way, in such a conventional device, the timing of changing the setting of the energization time is set to, for example, (1) every time when recording of data for one sheet of recording paper is started.

もしくは （１１）記録中にその通電時間と基準通電時間との差が
一定量以上となる毎。Or (11) Every time the difference between the energization time and the reference energization time becomes a certain amount or more during recording.

に設定している。It is set to .

〔背景技術の問題点〕[Problems with background technology]

このため、次のような問題があった。すなわち、（１）
の場合には、記録データに黒画素が多かったり、記録速
度が速いと、１枚の記録期間中ＶＣ感熱ヘッドの温度が
高くなって配録濃度が磯くなシ、この結果例えば記録画
像に尾引きやつぶれを生じて画品質の低下を招く。For this reason, the following problems occurred. That is, (1)
In this case, if there are many black pixels in the recorded data or if the recording speed is high, the temperature of the VC thermal head becomes high during the recording period of one sheet, and the recorded density becomes uneven.As a result, for example, the recorded image becomes This causes trailing and collapse, leading to a decline in image quality.

一方（１１）の場合には、通電時間Ｑと基準：ａ屯時闇
Ｐとの差が一定量以上となった時点で、例えば第２図（
ａ）に示すように通電時間が無条件に切換わるため、例
えは黒ラインが連続している時点で切換わると、第２図
（ｂ）に示す如くライン間で黒画像の濃度が急激に変化
し、不自然な画像となる欠点があった。On the other hand, in the case of (11), when the difference between the energization time Q and the reference: aton time darkness P becomes a certain amount or more, for example, as shown in Fig. 2 (
As shown in a), the energization time changes unconditionally, so for example, if the switching occurs when there are consecutive black lines, the density of the black image will suddenly change between the lines as shown in Figure 2 (b). This has the disadvantage that the image changes and becomes unnatural.

〔発明の目的〕[Purpose of the invention]

本発明は、記録画像に尾引きやつぶれ、濃度の不連続を
生じることなく、自然で画品質の高い記録−を得られる
ようにした感熱ヘッド制御装置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 thermal head control device that can obtain natural, high-quality recording without causing trailing, collapse, or density discontinuity in recorded images.

〔発明の概要〕[Summary of the invention]

不発８Ａは、上記目的を達成するために、各ラインもし
くは複数の少数ライン毎の記録時に、前ラインで指定し
た通を時間と感熱ヘッドの温度に応じて設定した基準通
電時間とを比較し、置時間が異なるときその差を小さく
する方間に予め設定された小時間だけ上記比較に供した
通電時間を変化させてこれを現ラインの通電時間とし、
この通電時間に相当する逍１１信号を感熱ヘッドに供給
するようにしたものでおる６つ１〕本発明は、央際に感
熱ヘッドに指定している通゛亀時間と基１ｗＡ通゛亀時
間との間に差がある場合に、通電時間を所定の小時間ず
つ変化させることによシ除々に基準通電時間に近づける
ようにしたものである。In order to achieve the above purpose, Misfire 8A compares the passing time specified in the previous line with a standard energization time set according to the temperature of the thermal head when recording each line or a plurality of small lines. When the energization time differs, the energization time used for the above comparison is changed by a preset small time to reduce the difference, and this is taken as the energization time of the current line,
The present invention is designed to supply a 11 signal corresponding to this energization time to the thermal head. If there is a difference between the two, the energization time is gradually brought closer to the reference energization time by changing the energization time in predetermined small time increments.

〔発明の実施例〕[Embodiments of the invention]

第３図は、本発明の一実施例における感熱ヘッド制御装
置の機能ブロック図である。なお、同図において前記第
１図と同一部分には同一符号を付して詳しい説明は省略
する。FIG. 3 is a functional block diagram of a thermal head control device in one embodiment of the present invention. In this figure, the same parts as those in FIG. 1 are given the same reference numerals and detailed explanations will be omitted.

図中ＪＯは通電時間設定部であシ、この通電時間設定部
１０Ｔｄ各ライン毎に通電時間を設定する通電時間設定
部本体１０ａと、逍′亀時間の可変菫である小時間ΔＲ
を記憶した記憶部１０ｂとから構成されている。１だ、
２に通電時間記憶部であシ、上記通電時間設定部１０で
設定された通電時間を各ライン毎に記憶するものである
。そして、この通電時間記憶部７に記憶されたＳ篭時間
は、通電時間設定部１０で通電時間を設定する際に前ラ
インの通電時間として通電時間設定部本体１０ｈに導入
される。In the figure, JO is an energization time setting section, and this energization time setting section 10Td is an energization time setting section body 10a that sets the energization time for each line, and a small time ΔR that is a variable summation time.
and a storage unit 10b that stores . It's 1.
2 is an energization time storage section which stores the energization time set by the energization time setting section 10 for each line. Then, when the energization time setting section 10 sets the energization time, the S-carrying time stored in the energization time storage section 7 is introduced into the energization time setting section main body 10h as the energization time of the previous line.

第４図は、上記不実施例装櫨の回路構成を示すブロック
図でめる。この１ｌｆｒｊ、マイクロプロセツサを制御
部とした制御（ロ）路（ｃｐｕ　）　７　ｉを備えてお
り、このＣＰＵ　Ｉ　Ｊに、制御子１１１１を指定する
プログラムＲＯＭ　１２と、通電時間記憶部８としての
ＲＡＭ　１３と、基準通電時間設定部６として動作する
通電時間ＲＯＭ　Ｊ　４と、ＣＰＵ　１　ｊから出力さ
れた通電時間情報に基づいて通電信号を発生するタイマ
１５と、ＣＰｔＪ　１１から出力された記憶データを感
熱ヘッド１へ送出する出力ポート１６と、ψ変換器５か
ら出力された温度情報ｔｌ−ＣＰＵ　１１に導ひくだめ
の入力４−ト１７とを、バス１８を介してそれぞれ接続
したものである。そして、この装置は上記ＣＰ（Ｊ　ｌ
　１により感熱ヘッド１の駆動に係わる各種制御を行な
う。FIG. 4 is a block diagram showing the circuit configuration of the non-embodiment device. This CPU 1lfrj is equipped with a control path (CPU) 7i using a microprocessor as a control section, and this CPU IJ is equipped with a program ROM 12 for specifying the controller 1111 and a energization time storage section 8. The RAM 13, the energization time ROM J4 that operates as the reference energization time setting section 6, the timer 15 that generates the energization signal based on the energization time information output from the CPU 1j, and the stored data output from the CPtJ 11. An output port 16 that sends the temperature information to the thermal head 1 and an input port 17 that sends temperature information output from the ψ converter 5 to the CPU 11 are connected via a bus 18. . And, this device has the above-mentioned CP (J l
1 performs various controls related to the drive of the thermal head 1.

次に、以上のように構成された装置の作用を設明する。Next, the operation of the apparatus configured as described above will be explained.

例えばファクシミリ装置の受信部からＭｅ記録−タが到
来すると、ＣＰｏ　１７は通電時１ａｊＱの初期設定全
行ない、第１４Ｍ目のラインよ夛記録動作の制御を開始
する。すなわち、Ｃ２Ｏ４ノは出力ポートノ６を介して
感熱ヘッド１へ記録データを供給するとともに、タイマ
１５に上記通電時間Ｑを設定してタイマ１５からこの通
電時間Ｑに相当する時間長の通電信号を発生させ、これ
を感熱ヘッド１に供給させる。しかして、感熱ヘッド１
は、上記通１時間Ｑだけ通を駆動され、この結果上記通
電時間Ｑに対応する＊ｉで記録データが記録される。そ
してＣＰＵ１１は、第２番目以降の各ラインの記録につ
いては、記録開始時にそれぞれ通電時間の設定を行なっ
て記録データの記録を行なう。For example, when a Me recorder arrives from a receiving section of a facsimile machine, the CPo 17 performs all the initial settings of 1ajQ when energized, and starts controlling the recording operation from the 14th Mth line. That is, C2O4 supplies recording data to the thermal head 1 through the output port 6, sets the energization time Q to the timer 15, and generates an energization signal with a length corresponding to the energization time Q from the timer 15. and supplies this to the thermal head 1. However, thermal head 1
is driven for the above-mentioned one hour Q, and as a result, recording data is recorded at *i corresponding to the above-mentioned energization time Q. The CPU 11 then records the recording data by setting the energization time at the start of recording for each line after the second line.

ところで、上記通電時間の設定は次のように行なってい
る。第５図はその制御手順を示すフローチャートである
。すなわち、１本のラインの記録を終了する毎にＣＰＵ
　Ｊ　Ｊは、先ず入力ポート１８を介して感熱ヘッド１
の温度情報を入力し、通１１時間ＲＯＭ　７４からこの
温度情報に応じた基準通電時間Ｐを胱出す。次にＣＰｏ
　７１は、ＲＡＭ　Ｉ　Ｊから前ラインの通電時間Ｑを
胱出し、この通電時間Ｑと通電時間ＲＯＭ　１４から入
力した基準通電時間Ｐとの大小関係を判定する。そして
、 Ｐ＜Ｑ であれは、前ラインの通電時間Ｑから予め設定しである
小時間ΔＲを減じたものを現ラインの通電時間Ｑとし、
一方 Ｐ）Ｑ であれば、前ラインの通電時間Ｑから小時間ΔＲを加え
たものを現ラインの通電時間Ｑとしてタイマ１５に出力
し、感熱ヘッド１を逃１１駆動させる。By the way, the above-mentioned energization time is set as follows. FIG. 5 is a flowchart showing the control procedure. In other words, each time recording of one line is finished, the CPU
JJ first connects the thermal head 1 through the input port 18.
temperature information is input, and a standard energization time P corresponding to this temperature information is output from the 11-hour ROM 74. Next, CPo
71 retrieves the energization time Q of the previous line from the RAM IJ, and determines the magnitude relationship between this energization time Q and the reference energization time P input from the energization time ROM 14. If P<Q, then the energization time Q of the current line is set by subtracting the preset short time ΔR from the energization time Q of the previous line.
On the other hand, if it is P)Q, the sum of the energization time Q of the previous line and the short time ΔR is outputted to the timer 15 as the energization time Q of the current line, and the thermal head 1 is driven by the escape 11.

したがって、例えは第６図（ａ）に示す如く通電時間Ｑ
が基準通電時間Ｐよりも長い場合には、通電時間Ｑは各
ライン毎に小時間ΔＲづつ除々に短靴される。Therefore, for example, as shown in FIG. 6(a), the energization time Q
When is longer than the reference energization time P, the energization time Q is gradually shortened by a short time ΔR for each line.

なお、前記通電時間Ｑと基準；ａ亀時間Ｐとの判定にお
いて、 Ｐ＝Ｑ と判定された場合は、基準通電時間Ｐがそのまま通電時
間Ｑとして出力される。したがって、通電時間Ｐは、一
度基準通電時間と寺しくなると、以後この基準通電時間
が変化しない限り一定となる。Note that in the determination between the energization time Q and the standard a-time period P, if it is determined that P=Q, the reference energization time P is directly output as the energization time Q. Therefore, once the energization time P becomes equal to the reference energization time, it remains constant unless the reference energization time changes thereafter.

また、以上のように通電時間Ｑの設定が終了すると、Ｃ
ＰＩ）　７１はこの通電時間ＱをＲＡＭ　ｌ　３に記憶
し、次のラインの通電時間Ｑの設定動作に備える。Furthermore, when the setting of the energization time Q is completed as described above, C
The PI) 71 stores this energizing time Q in the RAM 13 and prepares for setting the energizing time Q for the next line.

このように本笑施例であれば、ｍ軍時間Ｑと基準通電時
間Ｐとの間に差がある場合に、通電時間Ｑを即時基準通
電時間Ｐに変更せずに小時間ΔＲづつ除々に基準通電時
間Ｐに近づけるようにしたので、従来（第２図）のよう
に黒画像の濃度が急激に変化してあたかも異なる画像で
おるかのような印象を与える不具合がなくなシ、この結
果第６図（ｂ）に示す如く自然で画質のよい記録画像を
得ることができる・また、通電時間Ｑｒｉ除々ではあっ
ても基準通電時間Ｐに近つくので、通電時間Ｑを次頁の
記録開始時まで固定するものに比べて、記録画の尾引き
やつぶれ寺の発生を低減し、これにより画質の同上をは
かることができる。In this embodiment, if there is a difference between the military time Q and the standard energization time P, the energization time Q is not changed to the immediate reference energization time P, but is gradually changed by small time ΔR. Since the current energization time is made to be close to the standard energization time P, there is no problem with the conventional method (Fig. 2) where the density of the black image suddenly changes, giving the impression that the image is a different image. As shown in Fig. 6(b), natural and high-quality recorded images can be obtained.In addition, even if the energization time Qri gradually approaches the reference energization time P, the energization time Q is set at the start of recording the next page. Compared to those that are fixed until the time is reached, the occurrence of trailing and blurred edges in recorded images is reduced, and as a result, the image quality can be improved.

なお、不発明は上記実施例に限足されるものではない。Note that the invention is not limited to the above embodiments.

例えは、通電時間Ｑの変化時開ΔＲは、固定ではなく可
変にしてもよく、またその長さについては画像の自然さ
を損なわない範囲で如何に設定してもよい。さらに、前
記実施例では各ライン毎に通電時間を変化モせるように
したが、複数の少数ライン毎に行なってもよいＧその他
、通電時間設定部をはじめ各部の回路構成や制御手順等
についても、本発明の要旨を逸脱しない範囲で種々変形
して実施できる・〔発明の効果〕 以上詳述したように本発明は、通電時間と感熱ヘメドの
温度に応じて設定した基準通電時間との９間に差がめる
場合に、通電時間を予め設定した小時間づつ除々に基準
通電時間に近つけるようにしたものである。For example, the opening ΔR when the energization time Q changes may be made variable instead of fixed, and its length may be set as desired within a range that does not impair the naturalness of the image. Furthermore, in the embodiment described above, the energization time can be changed for each line, but it may be possible to change the energization time for each of a plurality of small lines. The present invention can be implemented with various modifications without departing from the gist of the invention. [Effects of the Invention] As described in detail above, the present invention can be implemented by changing the current application time and the reference current application time set according to the temperature of the heat-sensitive hemed. When making a difference between the two, the energization time is gradually brought closer to the reference energization time by small preset periods.

したがって、本発明によれば、記録画像に尾引きやつぶ
れ、濃度の不連続を生じることなく、自然で画質の高い
記＃！画を得ることができる感熱ヘッド制御装置を提供
することができる。Therefore, according to the present invention, natural and high-quality recording can be achieved without causing trailing, collapse, or density discontinuity in recorded images! A thermal head control device capable of obtaining images can be provided.

【図面の簡単な説明】[Brief explanation of drawings]

第１図に従来における感熱ヘッド制御装置の機能ブロッ
ク図、第２図（ａ）　、　（ｂ）　ｔｒｉ同装置による
通電時間の変化３よび記録画像を示す模式図、第３図〜
第６図（ａ）　、　（ｂ）に本発明の一実施例を説明す
るためのもので、第３図ｒ！感熱ヘッド節」御装置のＰ
Ａ能ブロック図、第４図は同装置の回路ブロック図、第
５図は制御手順を示すフローチャート、第６図（＆）　
、　（ｂ）は通電時間の変化および記録ｍ像を示す模式
図である。 １・・・感熱へメト、４・・・温間検出器、５・・・Ａ
／Ｉ）変換器、６・・・基準通電時間設定部、７・・・
通電時間記憶部、１０・・・通電時間設定部、Ｐ・・・
基準通電時間、Ｑ・・・通電時間、ΔＲ・・・小時間。 出願人代理人　弁理士　鈴　江　武　彦第１図 第２図 第３図 ０ 第４図 第５図FIG. 1 is a functional block diagram of a conventional thermal head control device, FIGS. 2(a) and (b) are schematic diagrams showing changes in energization time 3 and recorded images by the tri device, and FIGS.
Figures 6(a) and 6(b) are for explaining one embodiment of the present invention, and Figure 3r! P of the heat-sensitive head control device
A function block diagram, Figure 4 is a circuit block diagram of the device, Figure 5 is a flowchart showing the control procedure, Figure 6 (&)
, (b) is a schematic diagram showing changes in current application time and recorded m-images. 1...Heat-sensitive heat detector, 4...Warm detector, 5...A
/I) Converter, 6...Reference energization time setting section, 7...
Energization time storage section, 10... Energization time setting section, P...
Standard energizing time, Q... energizing time, ΔR... small time. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 0 Figure 4 Figure 5

Claims (1)

【特許請求の範囲】[Claims] 感熱ヘッドに記録データとともに通電信号を供給してヘ
ッドの通電時間を指定し、これによシ上記記録データの
記録濃度を制御する感熱ヘッド制御装置において、前記
感熱ヘッドの温度を検出する温度検出手段と、この温度
検出手段によシ得られた温度に応じて基準通電時間を設
定する基準通電時間設定手段と、各ラインもしくは複数
の少数ライン毎の記録時に前ラインで感熱ヘッドに指定
した通電時間と前記基準通電時間設定手段で設定された
基準通電時間とを比較し、内時間が異なるときその差孕
小さくする方向に予め設定された小時間だけ前記比較に
供した通電時間を変化させてこれを現ラインの通電時間
とし、この通電時間に相当する通電信号を感熱ヘッドに
供給する通電時間設定手段とをIn a thermal head control device that supplies an energization signal to a thermal head together with recording data to designate the energization time of the head, thereby controlling the recording density of the recording data, a temperature detection means for detecting the temperature of the thermal head. and a reference energization time setting means for setting a reference energization time according to the temperature obtained by the temperature detection means, and a energization time specified for the thermal head in the previous line when recording each line or a plurality of small lines. and the reference energization time set by the reference energization time setting means, and when the inner times differ, the energization time used for the comparison is changed by a preset small time in the direction of reducing the difference. is the energization time of the current line, and energization time setting means supplies an energization signal corresponding to this energization time to the thermal head.
JP59099225A 1984-05-17 1984-05-17 Thermal head controller Pending JPS60242074A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59099225A JPS60242074A (en) 1984-05-17 1984-05-17 Thermal head controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59099225A JPS60242074A (en) 1984-05-17 1984-05-17 Thermal head controller

Publications (1)

Publication Number Publication Date
JPS60242074A true JPS60242074A (en) 1985-12-02

Family

ID=14241718

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59099225A Pending JPS60242074A (en) 1984-05-17 1984-05-17 Thermal head controller

Country Status (1)

Country Link
JP (1) JPS60242074A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61173962A (en) * 1985-01-30 1986-08-05 Canon Inc Thermal recording system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61173962A (en) * 1985-01-30 1986-08-05 Canon Inc Thermal recording system

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