JPS6241056A - Recording head - Google Patents
Recording headInfo
- Publication number
- JPS6241056A JPS6241056A JP60181986A JP18198685A JPS6241056A JP S6241056 A JPS6241056 A JP S6241056A JP 60181986 A JP60181986 A JP 60181986A JP 18198685 A JP18198685 A JP 18198685A JP S6241056 A JPS6241056 A JP S6241056A
- Authority
- JP
- Japan
- Prior art keywords
- current
- circuit
- current amplification
- amplification circuit
- led
- 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
- B41J2/35—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
Landscapes
- Electronic Switches (AREA)
- Facsimile Heads (AREA)
- Fax Reproducing Arrangements (AREA)
- Facsimile Image Signal Circuits (AREA)
- Led Devices (AREA)
- Dot-Matrix Printers And Others (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明はファクシミリやプリンタ等の印字の用に供さ
れる記録ヘッドに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording head used for printing in facsimile machines, printers, and the like.
この発明の記録ヘッドは、記録素子として発熱抵抗素子
を用いて階調記録を行なうサーマμヘッドや発光素子で
あるＬＥＤを電子写真装置の記録光源とするＬＥＤアレ
イヘッドの駆動方法に関し醪
て効果のあるものであるが、ここで後者について八
詳述する。The recording head of the present invention is particularly effective in driving methods of a thermaμ head that performs gradation recording using a heat-generating resistive element as a recording element, and an LED array head that uses an LED as a light emitting element as a recording light source in an electrophotographic apparatus. However, I will discuss the latter in detail here.
一般に、ＬＥＤアレイヘッドでは、たとえは、１０個／
■の密度で６４〜１２８個のＬＥＤを形成した複数のＬ
ＥＤアレイチップを基板上に−列に配設し、これに沿っ
てその駆動回路（ＩＣ）を配列して、ＬＥＤと駆動ＩＣ
とを電流安定化抵抗器を介して接続する構成になってい
る。Generally, in an LED array head, for example, 10 pieces/
Multiple L with a density of 64 to 128 LEDs
The ED array chips are arranged in a row on the substrate, and the driving circuits (ICs) are arranged along this line to connect the LEDs and the driving ICs.
The configuration is such that they are connected through a current stabilizing resistor.
従来の構成を第２図で説明する。図中、（１００）は駆
動ＩＣの電流増幅部である。（１）はＬＥＤ。A conventional configuration will be explained with reference to FIG. In the figure, (100) is a current amplification section of the drive IC. (1) is an LED.
Ｒ１はＬ Ｅ Ｄ （１１への電流を安定化する電流安
定化抵抗器である。駆動ＩＣは通常３２ないし６４個の
電流増幅回路を備えておシ、ここでは図示していないが
Ｌ Ｅ Ｄ （１）を発光させる発光信号を転送するシ
フトレジスタと、出力端が各電流増幅回路に接続されて
その出力を保持するラッチ回路等から構−成されている
。R1 is a current stabilizing resistor that stabilizes the current to LED (11).The drive IC usually has 32 to 64 current amplification circuits, and although not shown here, LED (1) It is composed of a shift register that transfers a light emission signal that causes the light to emit light, and a latch circuit whose output end is connected to each current amplification circuit and holds the output.
Ｌ Ｅ Ｄ （１）は駆動特性の１つとして、その内部
抵抗が小さいという欠点がある０ 電流安定化抵抗器Ｒ
１がない場合には、僅かな印加電圧変動で大きな発光出
力変動を生じる。したがって、発光出力を安定化するた
めに５０〜１００Ω程度の負荷抵抗器を接続して電流値
を安定化させて定電流駆動に近い駆動方法にしている。L E D (1) has the disadvantage that its internal resistance is small as one of its driving characteristics0 Current stabilizing resistor R
1, a small change in applied voltage will cause a large change in light emission output. Therefore, in order to stabilize the light emission output, a load resistor of about 50 to 100 ohms is connected to stabilize the current value, resulting in a driving method close to constant current driving.
上記従来の回路構成は、各Ｌ Ｅ Ｄ （１）毎の発光
出力のばらつきが小さい場合には、とくに問題のない一
般的な構成である。The above-mentioned conventional circuit configuration is a general configuration with no particular problem when the variation in light emission output for each LED (1) is small.
しかしながら、実際に製造されるＬＥＤアレイチッグの
発光出力のばらつきには、チップ内およびチップ間で２
〜３倍に達する大きなものがある。However, there are variations in the light output of LED array chips that are actually manufactured, both within and between chips.
There is a large one that is ~3 times as large.
したがって、第２図に示した電流安定化抵抗器Ｒ１を接
続しただけの回路構成では、その発光出力のばらつきは
やはシ２〜３倍と大きく、これを補正して均一化するこ
とは困難である。Therefore, in a circuit configuration in which only the current stabilizing resistor R1 shown in Fig. 2 is connected, the variation in the light emission output is as large as 2 to 3 times, and it is difficult to correct this and make it uniform. It is.
ＬＥＤアレイヘッドを記録光源とする電子写真記録装置
では、隅品質な記録画像を得るために発光鴬の均一性が
求められ、その範囲は±１５％以内にする必要がある。In an electrophotographic recording apparatus using an LED array head as a recording light source, uniformity of light emission is required in order to obtain a recorded image with corner quality, and the range must be within ±15%.
したがって、ＬＥＤアレイヘッドに用いるＬＥＤアＶイ
チツデは、製造したＬＥＤアレイチップから適正なもの
だけを選別して使用しなければならない。ＬＥＤアレイ
チップの主な材料は通常の半導体に用いるＳｔに比べて
高価なＧａＡａであシ、ばらつきの少ないＬＥＤアレイ
チップだけを選別して用いるための、ＬＥＤアレイチッ
プやＬＥＤアＶイヘッドの価格は極めて高価なものとな
っている。Therefore, it is necessary to select only suitable LED chips from manufactured LED array chips for use in the LED array head. The main material for LED array chips is GaAa, which is more expensive than St, which is used in normal semiconductors.The price of LED array chips and LED eye heads is to select and use only LED array chips with little variation. It is extremely expensive.
この発明は、上記従来のものの問題点を解消するために
なされたもので、各記録素子の出力を均一化して高品質
な画像が得られる安価な記録ヘッドを提供することを目
的としている。The present invention has been made to solve the problems of the conventional apparatuses described above, and an object of the present invention is to provide an inexpensive recording head that can uniformize the output of each recording element and produce high-quality images.
この発明に係る記録ヘッドでは、駆動ＩＣの出力回路に
おいて、各記録素子毎に複数の分割電流増幅回路を設け
て各記録素子の出力効率に応じて上記分割電流増幅回路
を選択して記録素子に供給する電流を調整するようにし
たものである。In the recording head according to the present invention, in the output circuit of the drive IC, a plurality of divided current amplifier circuits are provided for each recording element, and the divided current amplifier circuit is selected according to the output efficiency of each recording element. The current to be supplied is adjusted.
この発明においては、複数の分割電流増幅回路を任意に
選択して記録素子を駆動するため、各記録素子の出力の
ばらつきを効果的に是正でき、しかも分割電流増幅回路
の数を多くすればする程駆動直流値を多種類にすること
ができ、記録素子の出力量を微調整できる。In this invention, since a plurality of divided current amplifier circuits are arbitrarily selected to drive the recording element, variations in the output of each recording element can be effectively corrected, and moreover, by increasing the number of divided current amplifier circuits, It is possible to use many types of drive DC values, and the output amount of the recording element can be finely adjusted.
第１図はこの発明の一実施例の記録ヘッドの構成を示す
ものである。ここでは、記録ヘッドにおける複数の駆動
ＩＣおよびＬＥＤのうち、３２ビツト構成にした１個の
駆動ＩＣについて示しである０
同図において、（１）は記録素子としてのＬＥＤ。FIG. 1 shows the configuration of a recording head according to an embodiment of the present invention. Here, one drive IC having a 32-bit configuration among the plurality of drive ICs and LEDs in the print head is shown. In the figure, (1) is an LED as a print element.
（２）は互に並列接続の４つの分割電流増幅回路、（２
１）。(2) consists of four divided current amplifier circuits connected in parallel, (2
1).
（２２１，（２３１、（財）からなる電流増幅回路、（
３）は記録ヘッドに入力された発光信号Ｓで電流増幅回
路（２）の動作を制御し、かつ電流増幅回路（２）の出
力電流値を制御する電流制御回路、（４）は分割電流増
幅回路ＣＤ。Current amplification circuit consisting of (221, (231, (foundation)), (
3) is a current control circuit that controls the operation of the current amplification circuit (2) using the light emission signal S input to the recording head, and also controls the output current value of the current amplification circuit (2), and (4) is a divided current amplification circuit. Circuit CD.
Ｅ、（２３１，（２４）のうち発光信号Ｓによシ必ず駆
動される電流増幅回路（２Ｈの出力電流を電流値検出抵
抗器Ｒ雪の両端にかかる電圧値で検出する電圧検出回路
としての比較回路、（５）は発光信号Ｓを順次クロック
信号に同期して転送するシストレジスタを含むメモリ回
路、 （６１、（７） 、 （８）はそれぞれ分割′１
ＪｔＩ／ｒｆ、増幅回路に、（２）、（２力の駆動をあ
らかじめ設定する駆動選択信号ａ、ｂ、ｃのメ４ｙ回路
である。（９）は発光信号Ｓと発光時間を設定する時限
信号Ｔのアンド回路である。（１０）は駆動ＩＣ自体の
温度を検知する感温センサであシ、検出した温度信号を
各電流制御回路（３）に伝達し、温度に応じてＬ Ｅ
Ｄ （１１への電流値を制御するようになっている。Among E, (231, (24)), a current amplifier circuit (as a voltage detection circuit that detects the output current of 2H by the voltage applied to both ends of the current value detection resistor R) is always driven by the light emission signal S. Comparison circuit, (5) is a memory circuit including a sister register that sequentially transfers the light emission signal S in synchronization with the clock signal, (61, (7), and (8) are each divided '1
JtI/rf, amplifier circuit, (2), (drive selection signal a, b, c that presets the two-power drive) (9) is the light emission signal S and the timer to set the light emission time This is an AND circuit for signal T. (10) is a temperature sensor that detects the temperature of the drive IC itself, transmits the detected temperature signal to each current control circuit (3), and L E depending on the temperature.
D (controls the current value to 11).
つぎに、動作について説明する。Next, the operation will be explained.
まず、各Ｌ Ｅ Ｄ （１）に対応して発光信号Ｓと駆
動選択信号ａ、ｂ、ｃがクロック信号と同期して順次各
メモリ回路（５） 、 （６＋ 、 （７＋ 、 （８
）に入力される。First, the light emission signal S and drive selection signals a, b, and c corresponding to each LED (1) are sequentially transmitted to each memory circuit (5), (6+, (7+, (8)) in synchronization with a clock signal.
) is input.
発光信号Ｓはアンド回路（９）で発光時間を設定する時
限信号Ｔと論理積がとられて電流制御回路（３）に入力
され、これによシミ流増幅回路（２）が駆動される。電
流増幅回路（２）における分割電流増幅回路（２１）は
電流検出抵抗器Ｒ，を介して、ＬＥＤ（１）に接続され
、その他の回路（支）〜（至）は直接Ｌ Ｅ Ｄ （１
）に接続されている。各分割電流増幅回路’（２１１、
（支）、■、（至）は電流制御回路（３）から伝達され
る信号量の大きさ、たとえば電圧値等で駆動する電流値
が設定されている。The light emission signal S is logically ANDed with the time limit signal T for setting the light emission time in an AND circuit (9), and is inputted to the current control circuit (3), thereby driving the spot current amplifier circuit (2). The divided current amplification circuit (21) in the current amplification circuit (2) is connected to the LED (1) via the current detection resistor R, and the other circuits (branches) to (to) are directly connected to the LED (1).
)It is connected to the. Each divided current amplification circuit' (211,
(support), ■, and (to) are set as the magnitude of the signal amount transmitted from the current control circuit (3), for example, the current value to be driven by the voltage value or the like.
また、分割１に流増幅回路ＣＤは発光信号Ｓｎによシ必
ず駆動されるが、その他のもの４（２２１〜（２４Ｊは
負荷であるＬ Ｅ Ｄ （１）の発光効率、すなわち駆
動電流で所定範囲の発光出力となるように、その駆動が
駆動選択信号ａｎ＊ｂｎｓＣＨで任意に選択される。In addition, although the current amplifier circuit CD in division 1 is always driven by the light emitting signal Sn, the other components 4 (221 to 24 J are the light emitting efficiency of the load L E D (1), that is, the drive current The drive is arbitrarily selected by the drive selection signal an*bnsCH so that the light emission output falls within the range.
−流増幅回路（２）の出力電流は、その供給電源電圧ｖ
ｌの電圧値に依存するので、ＬＥＤ（１１への供給電流
が一定となるように電流値検出抵抗器Ｒ１の両端にかか
る電圧を電圧比較回路（４）で検出し、検主値を電流制
御回路（３）に伝達する。-The output current of the current amplifier circuit (2) is equal to the supply voltage v
Since it depends on the voltage value of l, the voltage applied across the current value detection resistor R1 is detected by the voltage comparator circuit (4) so that the current supplied to the LED (11) is constant, and the test value is controlled by the current. It is transmitted to circuit (3).
Ｌ Ｅ Ｄ （１１の発光効率はＬＥＤ自身の温度に依
存して変化する。したがって、ＬＥＤ（１）の温度を検
出するためＬ Ｅ Ｄ （１）とほぼ同様の条件下にあ
る駆動ＩＣに感温センサα０）を設け、その感温センサ
α■の出力信号を各電流制御回路（３）に伝達し、温度
に応じた出力電流となるように電流増幅回路（２）が制
御される。すなわち、上記分割電流増幅回路（２１）を
ベースとして、他の分割電流増幅回路■〜例のうちのい
ずれかが選択されて駆動され、ＬＥＤ（１＋に対して発
光効率に応じた駆動電流が供給される。The luminous efficiency of LED (11) changes depending on the temperature of the LED itself. Therefore, in order to detect the temperature of LED (1), a sensor is applied to the drive IC under almost the same conditions as LED (1). A temperature sensor α0) is provided, and the output signal of the temperature sensor α2 is transmitted to each current control circuit (3), and the current amplification circuit (2) is controlled so that the output current corresponds to the temperature. That is, using the divided current amplifier circuit (21) as a base, any of the other divided current amplifier circuits (2) to (2) is selected and driven, and a drive current corresponding to the luminous efficiency is supplied to the LED (1+). be done.
これによって各Ｌ Ｅ Ｄ ＋１１の発光出力が均一化
され、換言すればＬＥＤアレイチップを選別使用［、な
くてよいため、コスト安となる。As a result, the light emitting output of each LED +11 is made uniform, and in other words, it is not necessary to selectively use LED array chips, resulting in lower costs.
ここでは、電流増幅回路（２）を４分割構成として説明
したが、分割数が多い程、駆動電流値を細密化でき、Ｌ
ＥＤ（１）の発光出力を均一化できる。たとえば、各分
割電流増幅回路（２１） 、 （２２＋、 日、 例の
出力電流値が同様の場合、負荷Ｌ Ｅ Ｄ （１１への
駆動電流は４種類であるが、すべてを異ならせた場合、
８種類にすることができる。また、分割電流増幅回路（
２１１も駆動選択制御した場合、１６種類と多種類化制
御が可能になる。Here, the current amplification circuit (2) has been explained as having a four-division configuration, but the larger the number of divisions, the finer the drive current value, and the L
The light emission output of the ED (1) can be made uniform. For example, if the output current values of the divided current amplifier circuits (21) and (22+) are the same, there are four types of drive current to the load LED (11), but if they are all different,
It can be made into 8 types. In addition, the divided current amplification circuit (
If 211 is also subjected to drive selection control, 16 types of control will be possible.
ところで、上記のものは、各Ｌ Ｅ Ｄ （ｌｊ毎に発
光信号Ｓと３つの駆動選択信号ａ、ｂ、ｃで駆動制御し
ているので、メモリ回路としては従来の発光信号Ｓのみ
を入力する場合の４倍必要となシ、駆動ＩＣも大きくな
る。By the way, since the above-mentioned device is driven and controlled by the light emission signal S and three drive selection signals a, b, and c for each LED (lj), only the conventional light emission signal S is input as a memory circuit. This requires four times as much as in the case of the conventional case, and the drive IC also becomes larger.
しかるに、ＬＥＤアレイチップにおいて、チップ内やチ
ップ間の発光出力（効率）のばらつきは大きなものがあ
るが、複数のＬ Ｅ Ｄ （１）のうちで互に隣接する
Ｌ Ｅ Ｄ （１）間では通常の場合大差はない。However, in LED array chips, there are large variations in luminous output (efficiency) within a chip or between chips, but among multiple LEDs (1), there is a large variation in luminous output (efficiency) between adjacent LEDs. Normally there is no big difference.
この現象を利用して、秀抜する複数のＬ Ｅ Ｄ （１
）に同一の駆動選択信号’ｆｌｌｂｆｉ＃Ｃｆｉを入力
して駆動するようにすれば、ＬＥＤアレイヘッドとして
の発光出力のばらつきを記録画像に支障のない程度に抑
制することができる。その結果、駆動選択信号ａ、ｂ、
ｃのメモリ回路＋５１ 、 （６１、（７）の数を減少
させ、駆動ＩＣを小形にでき、かつ一層安価なＬＥＤア
レイヘッドを提供できる。Utilizing this phenomenon, multiple LEDs (1
) by inputting the same drive selection signal 'fllbfi#Cfi to drive the LED array head, it is possible to suppress variations in the light emission output of the LED array head to an extent that does not interfere with the recorded image. As a result, drive selection signals a, b,
The number of memory circuits +51, (61, (7)) in c can be reduced, the drive IC can be made smaller, and a more inexpensive LED array head can be provided.
上記実施例は、記録素子としてＬ ＥＤ （１）を用い
た場合であるが、この発明の記録ヘッドは、これに限定
されるものではなく、発熱素子を用いたものにも適用可
能である。Although the above embodiment uses an LED (1) as a recording element, the recording head of the present invention is not limited to this, and can also be applied to one using a heat generating element.
たとえば、熱記録ヘッドで階調記録を行なう場合、発熱
抵抗素子への供給電力を制御し、高濃度画像を得るに伴
ない供給電力を大きくし発熱温度を高くしている◇この
供給電力の制御として２つの方法があった。第１の方法
は単位時間ａｂの電力供給量を一定とし、電力供給時間
を複数段階設け、所望の記録画像濃度を得るために必要
な発熱体温度を得ている。第２の方法は駆動回路の電源
電圧を制御することで、発熱抵抗素子への供給電力を制
御するものである。For example, when performing gradation recording with a thermal recording head, the power supplied to the heating resistor element is controlled, and as a high-density image is obtained, the supplied power is increased and the heat generation temperature is raised.◇Control of this supplied power There were two methods. In the first method, the amount of power supplied per unit time ab is constant, the power supply time is set in multiple stages, and the heating element temperature necessary to obtain the desired recorded image density is obtained. The second method is to control the power supply to the heating resistor element by controlling the power supply voltage of the drive circuit.
これらの方法は、よく知られているので、ここでは詳述
しないが、いずれにしても階調記録の場合には、白黒の
みの２値記録に比べて表現階調数が多くなるほど同一ラ
インの記録走査回数の増大や記録走査の時間が長くなル
、１枚の記録画像を得るのに長時間を必要としていた。Since these methods are well known, we will not discuss them in detail here, but in any case, in the case of gradation recording, the greater the number of expression gradations, the more the same line As the number of recording scans increases and the recording scan time increases, it takes a long time to obtain one recorded image.
この発明の熱記録ヘッドの場合、発熱抵抗素子の所定時
間内の駆動において、前述したようにすでに駆動電流値
を設定できるので、所定記録時間内で発熱素子毎に発熱
温度を制御でき、表現階調数が多くなっても１枚の記録
画像を得る時間は２値画像を得る場合と変わらない。In the case of the thermal recording head of the present invention, the drive current value can already be set as described above when driving the heat generating resistor elements within a predetermined time, so the heat generation temperature can be controlled for each heat generating element within the predetermined recording time. Even if the number of keys increases, the time required to obtain one recorded image is the same as when obtaining a binary image.
以上のように、この発明によれば、記録素子毎に
、記録素子毎に電流検出回路。As described above, according to the present invention, each recording element
, a current detection circuit for each recording element.
電流制御回路、電流増幅回路を設け、電流増幅回路を複
数に分割して互に並列接続し、各分割電流増幅回路を選
択して駆動する構成としたので、記録素子を駆動する所
定時間内に供給する電力を記録素子毎に異ならせること
ができ、この結果、たとえばＬＥＤアレイヘッドでは、
各ＬＥＤの発光出力を均一化でき、ばらつきの大きなも
のでも使用でき、したがって、低コスト化が図れ、また
、発熱記録素子を用いるものでは、表現階調数の多少に
かかわらず、白黒の２値記録の場合と同様に高速記録が
可能となる利点がある。A current control circuit and a current amplification circuit are provided, and the current amplification circuit is divided into multiple parts and connected in parallel to each other, and each divided current amplification circuit is selected and driven. The power supplied can be made different for each recording element, and as a result, for example, in an LED array head,
The light emitting output of each LED can be made uniform, even LEDs with large variations can be used, and therefore costs can be reduced.Furthermore, when using a heat-generating recording element, regardless of the number of gradations expressed, binary black and white can be used. As in the case of recording, there is an advantage that high-speed recording is possible.
第１図はこの発明に係る記録ヘッドが適用されたＬＥＤ
アレイヘッドの駆動回路の一例を示す構成図、第２図は
従来の記録ヘッドにおける駆動回路の構成図である。
（１）・・・記録素子、（２）・・・電流増幅回路、（
３）・・・電流制御回路、（４）−・・電流検出回路、
＋５１ 、 ＋６１ 、 （７１、（８）・・・メモリ
回路、（２１）、＠、（支）、（至）・・・分割電流増
幅回路。
なお、図中同一符号は同一もしくは相当部分を示す。FIG. 1 shows an LED to which the recording head according to the present invention is applied.
FIG. 2 is a block diagram showing an example of a drive circuit for an array head. FIG. 2 is a block diagram of a drive circuit in a conventional recording head. (1)...recording element, (2)...current amplifier circuit, (
3)...Current control circuit, (4)-...Current detection circuit,
+51, +61, (71, (8)...memory circuit, (21), @, (support), (to)...divided current amplification circuit. In addition, the same reference numerals in the figures indicate the same or equivalent parts. .
Claims (6)
ッドにおいて、各記録素子毎に駆動電流を検出する電流
検出回路と、各記録素子に駆動電流を出力する電流増幅
回路と、電流増幅回路の出力電流を制御する電流制御回
路とを備え、複数に分割して互に並列接続された複数の
分割電流増幅回路で上記電流増幅回路を構成し、記録素
子の記録効率に応じて上記分割電流増幅回路を選択して
駆動するように構成したことを特徴とする記録ヘッド。(1) In a print head equipped with a plurality of print elements and their drive circuits, a current detection circuit detects a drive current for each print element, a current amplification circuit outputs a drive current to each print element, and a current amplification circuit. and a current control circuit that controls the output current of the circuit, and the current amplification circuit is constituted by a plurality of divided current amplification circuits that are divided into a plurality of parts and connected in parallel to each other, and the current amplification circuit is configured to be divided according to the recording efficiency of the recording element. A recording head characterized in that it is configured to selectively drive a current amplification circuit.
らせて設定してなる特許請求の範囲第１項記載の記録ヘ
ッド。(2) The recording head according to claim 1, wherein the output current values of the divided current amplification circuits are set to be different.
るメモリ回路を備えてなる特許請求の範囲第１項記載の
記録ヘッド。(3) The recording head according to claim 1, further comprising a memory circuit for storing a drive selection signal for the divided current amplification circuit.
特許請求の範囲第１項記載の記録ヘッド。(4) The recording head according to claim 1, wherein the current control circuit has a temperature control function.
第１項記載の記録ヘッド。(5) The recording head according to claim 1, wherein the recording element is a light emitting element.
るように構成してなる特許請求の範囲第５項記載の記録
ヘッド。(6) The recording head according to claim 5, wherein the recording head is configured to control the power supplied to each of a plurality of adjacent light emitting elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18198685A JPH0649378B2 (en) | 1985-08-19 | 1985-08-19 | Record head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18198685A JPH0649378B2 (en) | 1985-08-19 | 1985-08-19 | Record head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6241056A true JPS6241056A (en) | 1987-02-23 |
| JPH0649378B2 JPH0649378B2 (en) | 1994-06-29 |
Family
ID=16110326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18198685A Expired - Fee Related JPH0649378B2 (en) | 1985-08-19 | 1985-08-19 | Record head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0649378B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6469369A (en) * | 1987-09-11 | 1989-03-15 | Stanley Electric Co Ltd | Light quantity controller for light-emitting element |
| JPH01125251A (en) * | 1987-11-11 | 1989-05-17 | Seiko Epson Corp | Thermal head drive device |
| JPH01502734A (en) * | 1987-04-01 | 1989-09-21 | ネックスプレス・ソリューションズ・エルエルシー | printer device |
| JPH05270052A (en) * | 1992-01-31 | 1993-10-19 | Kyocera Corp | Image forming apparatus |
| JP2011508939A (en) * | 2007-11-28 | 2011-03-17 | クリー エル イー ディー ライティング ソリューションズ インコーポレイテッド | Solid-state lighting device and manufacturing method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57126678A (en) * | 1981-01-30 | 1982-08-06 | Oki Electric Ind Co Ltd | Controlling method for driving of thernal recoding device |
| JPS59201876A (en) * | 1983-04-30 | 1984-11-15 | Fuji Xerox Co Ltd | Recorded density correcting device |
| JPS59202879A (en) * | 1983-05-06 | 1984-11-16 | Canon Inc | Optical printer |
| JPS59222368A (en) * | 1983-06-01 | 1984-12-14 | Mitsubishi Electric Corp | Driving circuit of thermal head |
| JPS6092880A (en) * | 1983-10-27 | 1985-05-24 | Fujitsu Ltd | Driving circuit for led array |
-
1985
- 1985-08-19 JP JP18198685A patent/JPH0649378B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57126678A (en) * | 1981-01-30 | 1982-08-06 | Oki Electric Ind Co Ltd | Controlling method for driving of thernal recoding device |
| JPS59201876A (en) * | 1983-04-30 | 1984-11-15 | Fuji Xerox Co Ltd | Recorded density correcting device |
| JPS59202879A (en) * | 1983-05-06 | 1984-11-16 | Canon Inc | Optical printer |
| JPS59222368A (en) * | 1983-06-01 | 1984-12-14 | Mitsubishi Electric Corp | Driving circuit of thermal head |
| JPS6092880A (en) * | 1983-10-27 | 1985-05-24 | Fujitsu Ltd | Driving circuit for led array |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01502734A (en) * | 1987-04-01 | 1989-09-21 | ネックスプレス・ソリューションズ・エルエルシー | printer device |
| JPS6469369A (en) * | 1987-09-11 | 1989-03-15 | Stanley Electric Co Ltd | Light quantity controller for light-emitting element |
| JPH01125251A (en) * | 1987-11-11 | 1989-05-17 | Seiko Epson Corp | Thermal head drive device |
| JPH05270052A (en) * | 1992-01-31 | 1993-10-19 | Kyocera Corp | Image forming apparatus |
| JP2011508939A (en) * | 2007-11-28 | 2011-03-17 | クリー エル イー ディー ライティング ソリューションズ インコーポレイテッド | Solid-state lighting device and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0649378B2 (en) | 1994-06-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |