JPH0372469B2 - - Google Patents
Info
- Publication number
- JPH0372469B2 JPH0372469B2 JP60286016A JP28601685A JPH0372469B2 JP H0372469 B2 JPH0372469 B2 JP H0372469B2 JP 60286016 A JP60286016 A JP 60286016A JP 28601685 A JP28601685 A JP 28601685A JP H0372469 B2 JPH0372469 B2 JP H0372469B2
- Authority
- JP
- Japan
- Prior art keywords
- output
- input
- interpolation
- ram
- conversion means
- 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 - Lifetime
Links
- 238000006243 chemical reaction Methods 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 description 34
- 238000012937 correction Methods 0.000 description 31
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000012546 transfer 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
- B41J2/35—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
-
- 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)
Description
【発明の詳細な説明】
産業上の利用分野
本発明はサーマルヘツドを用い中間調記録を行
なうプリンタ装置の記録特性の温度補正に関する
ものであり、CRTのハードコピー装置等に広く
応用できるものである。[Detailed Description of the Invention] Industrial Application Field The present invention relates to temperature correction of the recording characteristics of a printer device that performs halftone recording using a thermal head, and can be widely applied to CRT hard copy devices, etc. .
従来の技術
中間調記録を行なうサーマルプリンタは、複数
の発熱体を集積したサーマルヘツドを有し、各発
熱体を選択的に通電し発熱させることにより感熱
紙に、あるいは感熱転写紙から受像体に画像等を
記録するもので、中間調記録は記録のパルス幅を
制御し実効エネルギを変えることにより行なつて
いるが、記録パルス幅と記録濃度の関係は非線形
であるため忠実な中間調記録を行なうためには一
般にγ補正と呼ぶ補正を行なう必要がある。Prior Art A thermal printer that records halftones has a thermal head that integrates a plurality of heating elements, and by selectively energizing each heating element to generate heat, it prints on thermal paper or from thermal transfer paper to an image receptor. It records images, etc., and halftone recording is performed by controlling the recording pulse width and changing the effective energy, but since the relationship between recording pulse width and recording density is nonlinear, it is difficult to record faithful halftones. In order to do this, it is necessary to perform a correction generally called γ correction.
また、サーマルヘツドを用いた時の記録濃度は
環境温度に依存するため環境温度による補正も必
要になる。 Furthermore, since the recording density when using a thermal head depends on the environmental temperature, correction based on the environmental temperature is also required.
従来、γ補正と環境温度補正を独立して行なつ
ているものや、複数の環境温度におけるγ補正の
ROMテーブル群を設ておき環境温度により
ROMテーブル群の出力を選択するもの（特開昭
58−164375号公報）が提案されている。 Conventionally, γ correction and environmental temperature correction were performed independently, or γ correction was performed at multiple environmental temperatures.
A group of ROM tables is set up and depending on the environmental temperature
Selects output of ROM table group (JP-A-Sho
58-164375) has been proposed.
第４図は従来例のブロツク図である。環境温度
をｎ個のレベルに分け、各レベル毎にｎ個の
ROMテーブル２１１，２１２，…２１ｎからな
るROMテーブル群２１が構成されている。２４
はサーマルヘツドの環境温度を検出する温度検知
器、２３は温度検知器２４の出力電圧をデイジタ
ル信号に変換するＡ／Ｄ変換器、２２はＡ／Ｄ変
換器２３の出力が示す環境温度に対応するROM
テーブルを各ROMテーブル２１１，２１２，…
２１ｎの出力から選択し出力するテーブル選択回
路である。各ROMテーブルには、その環境温度
において、階調レベルとその階調レベルに対応す
る記録濃度を得るためにサーマルヘツドに通電す
るパルス幅等の関係が設定されており、各ROM
テーブルには階調レベル信号がアドレスとして入
力されている。したがつて、階調レベル信号ａが
入力されると各ROMテーブルからは各環境温度
γ補正された記録パルス幅データが出力され、温
度検知器２４が検出した環境温度データｂに基づ
き、テーブル選択回路は前述の各ROMテーブル
の出力からその環境温度に応じた出力を選択する
ことによつてγ補正と環境温度による補正を行な
つていた。 FIG. 4 is a block diagram of a conventional example. The environmental temperature is divided into n levels, and each level has n
A ROM table group 21 is composed of ROM tables 211, 212, . . . 21n. 24
23 is an A/D converter that converts the output voltage of the temperature sensor 24 into a digital signal; 22 corresponds to the environmental temperature indicated by the output of the A/D converter 23; ROM to do
Each ROM table 211, 212,...
This is a table selection circuit that selects and outputs from the outputs of 21n. In each ROM table, the relationship between the gradation level and the pulse width that is applied to the thermal head to obtain the recording density corresponding to that gradation level is set at the environmental temperature.
A gradation level signal is input to the table as an address. Therefore, when the gradation level signal a is input, each ROM table outputs recording pulse width data corrected for each environmental temperature γ, and table selection is performed based on the environmental temperature data b detected by the temperature detector 24. The circuit performs gamma correction and correction based on the environmental temperature by selecting an output corresponding to the environmental temperature from the outputs of each of the ROM tables mentioned above.
発明が解決しようとする問題点
従来例ではサーマルヘツドの環境温度に対応す
る複数のROMテーブルの出力をテーブル選択手
段によつて選択していたが、精度の高い温度補正
を行なおうとした場合、Ａ／Ｄ変換器のビツト数
を増加させるだけでなくROMテーブルの数も増
加させる必要があり、回路規模やコスト等の点か
ら、精度の高い温度補正は困難であつた。Problems to be Solved by the Invention In the conventional example, the output of a plurality of ROM tables corresponding to the environmental temperature of the thermal head was selected by the table selection means, but when attempting to perform highly accurate temperature correction, It is necessary not only to increase the number of bits of the A/D converter but also to increase the number of ROM tables, and highly accurate temperature correction has been difficult in terms of circuit scale and cost.
問題点を解決するための手段
本発明では上記問題点を解決するために、サー
マルヘツドと、このサーマルヘツドの発熱素子に
電力を印加するヘツド駆動手段と、このヘツド駆
動手段に記録パルスを与えるパルス発生手段と、
前記サーマルヘツドの温度を検出する温度検出手
段と、この温度検出手段の出力をＡ／Ｄ変換する
Ａ／Ｄ変換手段と、このＡ／Ｄ変換手段の出力の
ビツト数で表現できる組み合わせより少数の温度
における入力濃度データに対する記録パルス幅の
関係をテーブルとしてROMまたはRAMに設定
した入出力特性変換手段と、前記Ａ／Ｄ変換の出
力に対応して前記入出力変換手段の複数の前記テ
ーブルのデータ間を補間する補間手段とを備え、
前記濃度データと前記Ａ／Ｄ変換手段の出力を補
間することにより温度補正を行なうものである。Means for Solving the Problems In order to solve the above problems, the present invention provides a thermal head, a head driving means for applying power to the heating element of the thermal head, and a pulse for applying recording pulses to the head driving means. The means of generation and
A temperature detecting means for detecting the temperature of the thermal head, an A/D converting means for A/D converting the output of the temperature detecting means, and a combination smaller than the number of bits of the output of the A/D converting means. An input/output characteristic conversion means that sets a table of the relationship between recording pulse width and input concentration data at temperature in ROM or RAM, and data in a plurality of tables of the input/output conversion means corresponding to the output of the A/D conversion. and an interpolation means for interpolating between the
Temperature correction is performed by interpolating the density data and the output of the A/D conversion means.
作 用
本発明は、サーマルヘツドの環境温度が上昇あ
るいは下降し記録パルス幅に対する記録濃度の関
係が変化すると、その変化に応じて補正曲線自体
を変えることにより、如何なる温度においても中
間調全域にわたつて正確なサーマルヘツドの温度
補正を行なうことができる。Effects of the present invention When the environmental temperature of the thermal head rises or falls and the relationship between the recording density and the recording pulse width changes, the correction curve itself is changed in accordance with the change, so that the correction curve can be adjusted over the entire halftone range at any temperature. Therefore, accurate temperature correction of the thermal head can be performed.
実施例
本発明の実施例について図を用いて説明する。
第１図は本発明のプリンタ装置の第一の実施例の
ブロツク図である。Embodiment An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram of a first embodiment of the printer apparatus of the present invention.
１はある環境温度における、入力階調レベルに
対応する濃度レベルの記録パルス幅に対する非線
形性を補正するγ補正データのテーブルを、適当
な環境温度レベルの数だけROMまたはRAMに
設定した入出力特性変換手段である。３はサーマ
ルヘツド４の各発熱体を独立して駆動するヘツド
駆動手段、５はサーマルヘツド４の基台等の環境
温度を検出し電圧を発生する温度検出手段、６は
温度検出手段５の出力電圧をデイジタル値に変換
するＡ／Ｄ変換器、８は入力された階調レベルデ
ータに対応して複数ROMテーブルからなる入出
力特性変換手段１が出力する複数の出力パルス幅
データをＡ／Ｄ変換器６により検出された環境温
度データに基づいて補間し、出力パルス幅データ
とする補間手段、２は補間手段８が出力するパル
ス幅データに応じてヘツド駆動手段３の印加パル
ス幅を制御するパルス発生手段、７はヘツド駆動
手段３にサーマルヘツド４の各発熱体を駆動する
電圧を与える電源である。 1 is an input/output characteristic in which a table of γ correction data that corrects the nonlinearity of the density level corresponding to the input gradation level with respect to the recording pulse width at a certain environmental temperature is set in ROM or RAM for an appropriate number of environmental temperature levels. It is a conversion means. 3 is a head driving means for independently driving each heating element of the thermal head 4; 5 is a temperature detecting means for detecting the environmental temperature of the base of the thermal head 4, etc. and generating a voltage; 6 is an output of the temperature detecting means 5. An A/D converter 8 converts a voltage into a digital value, and an A/D converter 8 converts a plurality of output pulse width data outputted by the input/output characteristic conversion means 1 consisting of a plurality of ROM tables in accordance with the input gradation level data. Interpolation means 2 controls the applied pulse width of the head driving means 3 according to the pulse width data outputted by the interpolation means 8. The pulse generating means 7 is a power source for applying voltage to the head driving means 3 to drive each heating element of the thermal head 4.
この実施例の動作について説明する。 The operation of this embodiment will be explained.
例えば、階調レベル信号がｎビツト、入出力特
性変換手段１のγ補正テーブルの数が2m個、Ａ／
Ｄ変換器６が検出する環境温度の検出精度がｋビ
ツト（ｋ＞ｍ）とすると、ある環境温度における
入力階調レベルに対応する濃度レベルの記録パル
ス幅に対する非線形性を補正するγ補正データを
書き込んだγ補正テーブルのアドレス入力はｎビ
ツトになる。入出力特性変換手段１は、このよう
なγ補正テーブルを各温度レベルに応じて2m個用
意し、ROMまたはRAMに設定したものであり、
入出力特性変換手段１を構成するROMまたは
RAMの容量はアドレスでｎ＋ｍビツト有ればよ
い。 For example, the gradation level signal is n bits, the number of γ correction tables of the input/output characteristic conversion means 1 is 2m , and the A/
Assuming that the detection accuracy of the environmental temperature detected by the D converter 6 is k bits (k>m), γ correction data is used to correct the nonlinearity of the density level corresponding to the input gradation level at a certain environmental temperature with respect to the recording pulse width. The address input of the written γ correction table is n bits. The input/output characteristic conversion means 1 has 2 m of such γ correction tables prepared according to each temperature level, and is set in ROM or RAM.
ROM or
The capacity of RAM should be n+m bits in address.
外部の機器やプリンタ装置の前段の信号処理部
から、ｎビツトの入力階調レベルデータａが入力
されたとき、ａは入出力特性変換手段１の下位の
アドレスに与えられ、温度検出手段５により測定
されたサーマルヘツドの環境温度をＡ／Ｄ変換手
段６でＡ／Ｄ変換したｋビツトの環境温度レベル
データｂの上位ｍビツトb1は環境温度レベルデー
タの整数部として入出力特性変換手段１の上位の
アドレスに与られ、環境温度レベルデータｂの下
位ｋ−ｍビツトb2少数部としては補間手段８に与
られる。 When n-bit input gradation level data a is input from an external device or a signal processing section in the front stage of the printer device, a is given to the lower address of the input/output characteristic conversion means 1, and is input by the temperature detection means 5. The upper m bits b1 of the k-bit environmental temperature level data b obtained by A/D converting the measured environmental temperature of the thermal head by the A/D converting means 6 are converted to the input/output characteristic converting means 1 as an integer part of the environmental temperature level data. The lower km bits b2 of the environmental temperature level data b are applied to the interpolation means 8 as the fractional part.
このとき入出力特性変換手段１は、入力階調レ
ベルａをγ補正したパルス幅データをその環境温
度データの整数部b1に対応した出力c1と一段階上
の環境温度データの整数部b1＋１に対応した出力
c2とを出力し補間手段８に与える。 At this time, the input/output characteristic converting means 1 converts the input gradation level a into γ-corrected pulse width data, output c 1 corresponding to the integer part b 1 of the environmental temperature data, and output c 1 corresponding to the integer part b of the environmental temperature data one step higher. Output corresponding to 1 +1
c 2 is outputted and given to the interpolation means 8.
補間手段８はＡ／Ｄ変換手段６の出力ｂのｋ−
ｍビツトの少数部b2によりc1とc2を内分により線
型補間しＡ／Ｄ変換手段したｋビツトの環境温度
に相当する精度で環境温度補償されたパルス幅デ
ータを得ることができる。 The interpolation means 8 calculates k- of the output b of the A/D conversion means 6.
By linearly interpolating c1 and c2 by internal division using the m-bit decimal part b2 , it is possible to obtain environmental temperature compensated pulse width data with an accuracy equivalent to the k-bit environmental temperature of the A/D converter.
なお、本発明の入出力特性変換手段１は、言い
かえると入力階調レベルａと環境温度の整数部b2
による二次元テーブルであり、ROMまたは
RAMに与えるアドレスはａとb2の何れが上位に
あつても同等である。 In other words, the input/output characteristic converting means 1 of the present invention converts the input gradation level a and the integer part b 2 of the environmental temperature.
It is a two-dimensional table based on ROM or
The address given to the RAM is the same regardless of whether a or b2 is in the higher order.
第２図は本発明のプリンタ装置の他の実施例の
ブロツク図である。 FIG. 2 is a block diagram of another embodiment of the printer device of the present invention.
１０は、CPU１１、ROM１２、第一のRAM
１３、第二のRAM１４、第一のPORT１５、第
二のPORT１６、第三のPORT１７から構成さ
れるマイクロコンピユータを用いた入出力変換手
段であり、ｃはアドレスバスでありｄはデータバ
スである。２から７は、前述の実施例と同様で、
２はパルス幅データに応じた記録パルスを発生す
るパルス発生手段、３はサーマルヘツド４の各発
熱体を駆動するヘツド駆動手段、５は環境温度を
検出し電圧を発生する温度検出手段、６は温度検
出手段５の出力電圧をデイジタル値に変換する
Ａ／Ｄ変換器、７はヘツドを駆動する電源であ
る。 10 is CPU 11, ROM 12, first RAM
13, an input/output conversion means using a microcomputer, which is composed of a second RAM 14, a first PORT 15, a second PORT 16, and a third PORT 17, where c is an address bus and d is a data bus. 2 to 7 are similar to the previous example,
Reference numeral 2 denotes a pulse generating means for generating a recording pulse according to pulse width data, 3 a head driving means for driving each heating element of the thermal head 4, 5 a temperature detecting means for detecting the environmental temperature and generating a voltage, and 6 a temperature detecting means for generating a voltage. An A/D converter converts the output voltage of the temperature detecting means 5 into a digital value, and 7 is a power source for driving the head.
次に、この実施例の動作について説明する。上
述のマイクロコンピユータ１０のCPU１１は、
ROM１２に書き込まれているプログラムによつ
て第一のRAM１３をスタツクやワークエリアと
して使い命令を実行する。 Next, the operation of this embodiment will be explained. The CPU 11 of the microcomputer 10 mentioned above is
The program written in the ROM 12 uses the first RAM 13 as a stack or work area to execute instructions.
ROM１２内には階調レベルデータに対応する
アドレスがｎビツトのγ補正テーブルが、2m個
（ｍ＜ｋ）予め設定記憶されている。 In the ROM 12, 2 m (m<k) gamma correction tables each having n-bit addresses corresponding to gradation level data are preset and stored.
CPU１１は第３図のフローチヤートに示すよ
うに、例えば一ラインを印写するごとに、温度検
出手段５とＡ／Ｄ変換手段６での計測変換したサ
ーマルヘツド４の環境温度データｂ（ｋビツト）
を第二のポートから読む。ｋビツトと環境温度デ
ータｂの整数部である上位ｍビツトb1を基に、前
述のγ補正テーブル群の内b1番目の第一のテーブ
ルｇ（b1，ｘ）とb1＋１番目の第二のテーブルｇ
（b1＋１、ｘ）を選択し、環境温度データｂの少
数部である下位ｋ−ｍビツトb2を基に第一と第二
のテーブルの各要素間の順に線型補間することに
より第二のRAM１４中にｋビツトの環境温度デ
ータｂに対応する新たなアドレスがｎビツトγ補
正テーブルｆ（ｘ）を作製し、その後一ラインの
印写が終了するまで、次のシーケンスで各画素ご
との処理を行なう。 As shown in the flowchart of FIG. 3, the CPU 11 reads the environmental temperature data b (k bits) of the thermal head 4 measured and converted by the temperature detection means 5 and the A/D conversion means 6, for example, every time one line is printed. )
from the second port. Based on the k bits and the upper m bits b 1 which are the integer part of the environmental temperature data b, the first table g( b 1 , second table g
(b 1 +1 , A new address corresponding to the k-bit environmental temperature data b creates an n-bit γ correction table f(x) in the RAM 14 of Process.
まず、他の機器からや画素データの前処理部か
ら入力された階調レベルデータａを第一のポート
から読み込み、第二のRAM１４中に展開されい
いるγ補正テーブルｆ（ｘ）に前記ａをパラメー
タとしたアドレスを与えγ補正データされたパル
ス幅データを得、第三のポート１７からパルス幅
変調手段２へ出力する。 First, the gradation level data a input from another device or a pixel data preprocessing unit is read from the first port, and the γ correction table f(x) developed in the second RAM 14 is stored in the γ correction table f(x). is given as a parameter, pulse width data subjected to γ correction data is obtained, and is outputted from the third port 17 to the pulse width modulation means 2.
本実施例では、説明を容易にするために第一の
RAMと第二のRAMを備えたものを挙げたが、
RAMの容量さえ許せば同一のRAMの分割使用
してもよい。 In this example, for ease of explanation, the first
I listed one with RAM and a second RAM,
The same RAM can be divided and used as long as the RAM capacity allows.
また、前述した二つの実施例は線型補間を例に
説明したが本特許の趣旨から補間の種類にはよら
ない。 Further, although the above two embodiments have been described using linear interpolation as an example, the spirit of this patent does not depend on the type of interpolation.
発明の効果
以上、詳細に説明してきたように、中間調記録
を行なうサーマルプリンタにおいて、本発明によ
ればサーマルヘツドの環境温度が上昇あるいは下
降し記録パルス幅に対する濃度の関係が変化する
と、その変化に応じて補正曲線自体を変えること
により、如何なる温度においても中間調全域にわ
たつて正確な温度補正を簡単な構成と低コストで
実現できる。特に、環境温度を６ビツトから８ビ
ツトのＡ／Ｄ変換器で検出変換した場合でも、予
め内蔵しているγ補正テーブルが４から８枚程度
で実用上良好な温度補正が行なわれている。Effects of the Invention As described in detail above, in a thermal printer that performs halftone recording, according to the present invention, when the environmental temperature of the thermal head rises or falls and the relationship between the density and the recording pulse width changes, the relationship between the density and the recording pulse width changes. By changing the correction curve itself according to the temperature, accurate temperature correction can be achieved over the entire halftone range at any temperature with a simple configuration and low cost. In particular, even when the environmental temperature is detected and converted by a 6-bit to 8-bit A/D converter, practically good temperature correction can be performed with about 4 to 8 pre-built-in γ correction tables.
なお、本発明は前述の実施例に限定されるもの
ではなく、種々の変形が可能である。例えば、入
出力特性変換手段がRAMを用いて構成されてい
る場合、そのRAMにはここで述べたγ補正以外
の階調補正や変換が複合されて格納されていても
同様である。 Note that the present invention is not limited to the above-described embodiments, and various modifications are possible. For example, if the input/output characteristic conversion means is configured using a RAM, the same applies even if the RAM stores a combination of gradation corrections and conversions other than the γ correction described here.
第１図は本発明の一実施例におけるプリンタ装
置のブロツク図、第２図は本発明の他の実施例に
おけるプリンタ装置のブロツク図、第３図は同プ
リンタ装置の処理内容のフローチヤート、第４図
は従来例におけるプリンタ装置のブロツク図であ
る。
１……入出力特性変換手段、２……パルス発生
手段、３……ヘツド駆動手段、４……サーマルヘ
ツド、５……温度検出手段、６……Ａ／Ｄ変換手
段、７……電源、８……補間手段、１１……
CPU、１２……ROM、１３，１４……RAM、
１５，１６，１７……入出力ポート。
FIG. 1 is a block diagram of a printer device according to an embodiment of the present invention, FIG. 2 is a block diagram of a printer device according to another embodiment of the present invention, FIG. 3 is a flowchart of processing contents of the printer device, and FIG. FIG. 4 is a block diagram of a conventional printer device. DESCRIPTION OF SYMBOLS 1... Input/output characteristic conversion means, 2... Pulse generation means, 3... Head driving means, 4... Thermal head, 5... Temperature detection means, 6... A/D conversion means, 7... Power supply, 8... Interpolation means, 11...
CPU, 12...ROM, 13,14...RAM,
15, 16, 17...input/output ports.
Claims (1)
熱素子に電力を印加するヘツド駆動手段と、階調
を有する入力濃度データに応じて前記ヘツド駆動
手段の印加パルス幅を制御するパルス発生手段
と、前記サーマルヘツドの温度を検出する温度検
出手段と、この温度検出手段の出力をＡ／Ｄ変換
するＡ／Ｄ変換手段と、このＡ／Ｄ変換手段の出
力のビツト数で表現できる組み合わせより少数の
温度における入力濃度データに対する記録パルス
幅の関係をテーブルとしてROMまたはRAMに
設定した入出力特性変換手段と、前記濃度データ
と前記Ａ／Ｄ変換手段の出力から記録パルス幅を
得ることにより中間調記録をおこないうるプリン
タ装置であつて、前記Ａ／Ｄ変換手段の出力に対
応して前記テーブルのデータに基づいて複数の前
記テーブルのデータ間を補間する補間手段を備え
たことを特徴とするプリンタ装置。 ２ 補間手段は、複数の前記テーブルから、Ａ／
Ｄ変換手段の出力に対応して濃度データが入力さ
れる毎に逐一補間し記録パルス幅を得ることを特
徴とする特許請求の範囲第１項記載のプリンタ装
置。 ３ 補間手段は、複数の前記テーブルから、Ａ／
Ｄ変換手段の出力に対応して補間した補間テーブ
ルをRAM中に作製し、濃度データにより前記補
間テーブルを参照し記録パルス幅を得ることを特
徴とする特許請求の範囲第１項記載のプリンタ装
置。 ４ CPU、ROM、RAM、入出力ポートからな
るマイクロコンピユータを備え、前記ROMまた
はRAMを用いたテーブルで構成された入出力変
換手段を前記マイクロコンピユータのメモリーと
して割当て前記入出力ポートから読みとつたＡ／
Ｄ変換の出力に応じてソフトウエアにより補間を
行ない補間テーブルをRAM中に作製し、前記入
出力ポートから読みとつた濃度データで前記補間
テーブルを参照することを特徴とする特許請求の
範囲第３項記載のプリンタ装置。[Scope of Claims] 1. A thermal head, a head driving means for applying power to a heating element of the thermal head, and a pulse generator for controlling an applied pulse width of the head driving means in accordance with input density data having gradations. a temperature detection means for detecting the temperature of the thermal head, an A/D conversion means for A/D converting the output of the temperature detection means, and a combination that can be expressed by the number of bits of the output of the A/D conversion means. By obtaining the recording pulse width from the input/output characteristic conversion means which sets the relationship between the recording pulse width and the input density data at a smaller number of temperatures in the ROM or RAM as a table and the output of the density data and the A/D conversion means. A printer device capable of performing halftone recording, characterized by comprising interpolation means for interpolating between data of a plurality of tables based on data of the tables in response to the output of the A/D conversion means. printer device. 2. The interpolation means selects A/A from the plurality of tables.
2. The printer apparatus according to claim 1, wherein the recording pulse width is obtained by interpolating the density data one by one every time the density data is input in accordance with the output of the D conversion means. 3. The interpolation means selects A/A from the plurality of tables.
2. The printer device according to claim 1, wherein an interpolation table is created in a RAM by interpolation corresponding to the output of the D conversion means, and the recording pulse width is obtained by referring to the interpolation table based on the density data. . 4 Equipped with a microcomputer consisting of a CPU, ROM, RAM, and input/output ports, an input/output conversion means configured with a table using the ROM or RAM is allocated as the memory of the microcomputer and read from the input/output ports A. /
A third aspect of the present invention is characterized in that interpolation is performed by software in accordance with the output of the D conversion to create an interpolation table in RAM, and the interpolation table is referred to using the density data read from the input/output port. Printer device as described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28601685A JPS62144968A (en) | 1985-12-19 | 1985-12-19 | Printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28601685A JPS62144968A (en) | 1985-12-19 | 1985-12-19 | Printer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62144968A JPS62144968A (en) | 1987-06-29 |
| JPH0372469B2 true JPH0372469B2 (en) | 1991-11-18 |
Family
ID=17698890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28601685A Granted JPS62144968A (en) | 1985-12-19 | 1985-12-19 | Printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62144968A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0832463B2 (en) * | 1987-08-24 | 1996-03-29 | 松下電器産業株式会社 | Printer device |
| JP2695008B2 (en) * | 1989-06-13 | 1997-12-24 | 株式会社日立製作所 | Thermal recording device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62116168A (en) * | 1985-11-15 | 1987-05-27 | Hitachi Ltd | Thermal head controlling system |
-
1985
- 1985-12-19 JP JP28601685A patent/JPS62144968A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62116168A (en) * | 1985-11-15 | 1987-05-27 | Hitachi Ltd | Thermal head controlling system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62144968A (en) | 1987-06-29 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |