JPH0632972B2 - Printer head drive circuit - Google Patents
Printer head drive circuitInfo
- Publication number
- JPH0632972B2 JPH0632972B2 JP59277906A JP27790684A JPH0632972B2 JP H0632972 B2 JPH0632972 B2 JP H0632972B2 JP 59277906 A JP59277906 A JP 59277906A JP 27790684 A JP27790684 A JP 27790684A JP H0632972 B2 JPH0632972 B2 JP H0632972B2
- Authority
- JP
- Japan
- Prior art keywords
- printer head
- drive circuit
- voltage
- head drive
- input
- 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
- 230000003287 optical effect Effects 0.000 claims description 16
- 238000010586 diagram Methods 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 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
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/0452—Control methods or devices therefor, e.g. driver circuits, control circuits reducing demand in current or voltage
-
- 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
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04586—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type
Landscapes
- Electronic Switches (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
- Dot-Matrix Printers And Others (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明はプリンターの駆動回路に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive circuit of a printer.
従来の技術 従来、プリンター、特にインクジェットプリンターにお
いては、記録ヘッドが高電圧駆動であるため、プリンタ
ーの駆動回路には高耐圧トランジスタを使用している。
第４図はその駆動回路の一例で、トランジスタ４２のベ
ースに入力信号を加えてトランジスタ４２をスイッチン
グし、トランジスタ４２が導通したときそのコレクタ端
子と抵抗４１の接続中点より出力をとり出し、プリンタ
ヘッド４３に印加する。印加電圧Ｖ１は出力信号の波高
値を設定するものである。ＶＢはプリンタヘッド４３に
加えるバイアス電圧である。2. Description of the Related Art Conventionally, in a printer, especially an inkjet printer, a recording head is driven at a high voltage, and therefore a high voltage transistor is used in a drive circuit of the printer.
FIG. 4 is an example of the driving circuit, in which an input signal is applied to the base of the transistor 42 to switch the transistor 42, and when the transistor 42 becomes conductive, the output is taken out from the midpoint of the connection between the collector terminal and the resistor 41. It is applied to the head 43. The applied voltage V 1 sets the peak value of the output signal. V B is a bias voltage applied to the printer head 43.
第５図ａは第４図の回路構成における入力信号と出力信
号の波形図である。FIG. 5a is a waveform diagram of the input signal and the output signal in the circuit configuration of FIG.
発明が解決しようとする問題点 しかし、第４図のような構成では、印加電圧Ｖ１が高い
為に抵抗４１を大きな値にしても、抵抗４１で消費する
損失電力が大きく、それによる熱損失の処理法及び供給
電源の大型化が問題となった。又、プリンタヘッド４３
に負電圧の駆動信号を印加したい場合、高耐圧トランジ
スタ４２としてＰＮＰ型又はＰチャネルのトランジスタ
を使用するが、それらは入手し難いと同時に、入力信号
も負電圧にする必要があった。又、第５図ｂのように、
駆動信号に一定電圧Ｖ２を重畳するというように、印加
電圧の形態を変更する場合にも回路構成を変える必要が
生じるという問題があった。Problems to be Solved by the Invention However, in the configuration shown in FIG. 4, even if the resistance 41 is set to a large value because the applied voltage V 1 is high, the power loss consumed by the resistance 41 is large, and the heat loss due to it is large. There was a problem with the treatment method and the increase in power supply. In addition, the printer head 43
When it is desired to apply a negative voltage drive signal to the device, a PNP type or P channel transistor is used as the high breakdown voltage transistor 42. However, it is difficult to obtain them, and at the same time, the input signal needs to be a negative voltage. Also, as shown in FIG.
There is a problem that it is necessary to change the circuit configuration when changing the form of the applied voltage such as superimposing the constant voltage V 2 on the drive signal.
本発明は、従来技術の以上のような問題を解決するもの
で、電力ロスを少なくし、印加電圧の極性及び形態に関
係しない回路構成とし、しかも簡単でかつ比較的安価に
実現できることを目的とするものである。The present invention solves the above problems of the prior art, and aims to reduce the power loss, have a circuit configuration that is not related to the polarity and form of the applied voltage, and still be simple and relatively inexpensive. To do.
問題点を解決するための手段 本発明は、２個の光結合器の夫々の２個の出力端子のう
ち、一方を互いに、負荷に比べ小さな値の抵抗を夫々介
して直列に接続し、夫々の出力端子の他方を、異なった
電位の２個の電源に夫々接続し、一方の光結合器と他方
の光結合器の入力側端子には、夫々位相を反転させたデ
ジタル信号を入力し、前記直列接続した点をプリンタヘ
ッドの一方の入力端子とするプリンタヘッド駆動回路で
ある。Means for Solving the Problems According to the present invention, one of two output terminals of each of two optical couplers is connected in series with each other through resistors having a smaller value than a load, respectively. The other of the output terminals of is connected to two power supplies of different potentials, and the input side terminals of the optical coupler of one side and the optical coupler of the other side respectively input the digital signals whose phases are inverted, A printer head drive circuit in which the point connected in series is used as one input terminal of the printer head.
作用 本発明は上記構成により、一方の光結合器の出力側であ
るフォトスイッチ素子をＯＮ状態に、他方の光結合器の
フォトスイッチ素子をＯＦＦ状態にし、それらの状態を
交互に変化させ動作させる事により、電力損失を小さく
したものであり、又、入力側と出力側が完全に分離，絶
縁されているので、出力側供給電源としてどんな極性
の、どういう形態の電圧を印加してもよく、それによっ
て、入力レベルを変更する必要がないようにしたもので
ある。With the above-described configuration, the present invention turns on the photoswitch element on the output side of one of the optical couplers and turns off the photoswitch element of the other optical coupler, and alternately operates the states. As a result, the power loss is reduced, and since the input side and the output side are completely separated and insulated, any polarity and any form of voltage may be applied as the output side power supply. This makes it unnecessary to change the input level.
実施例 以下、図面を参照しながら本発明の実施例について説明
する。Embodiments Embodiments of the present invention will be described below with reference to the drawings.
第１図は、本発明の１つの実施例におけるプリンタヘッ
ド駆動回路の構成図である。第１図に於いて１，２はフ
ォトインタラプタ，フォトリレー，フォトカプラーなど
のような光結合器、３，４は光結合器１，２内のＬＥ
Ｄ、５，６は光結合器１，２内のフォトスイッチ素子で
あり、フォトトランジスタ，フォトトライアック，フォ
トサイリスタ等が用いられる。７，８は、光結合器１，
２がＯＮからＯＦＦに変化する場合のラッシュ電流を制
限する為の保護抵抗であり、プリンタヘッド１２の抵抗
分に較べ小さい。９，１０は、ＬＥＤ３，４に適切な電
流が流れるようにする為の抵抗、１１は、入力信号を反
転させる為のインバータである。光結合素子１，２の出
力側の端子には夫々Ｖ１，Ｖ２なる異なる電圧の電源が
接続され、保護抵抗７，８の結合点からは、出力信号が
とり出され、プリンタヘッド１２に印加されている。プ
リンタヘッド１２の他方の端子にはバイアス電圧Ｖ３な
る電源が接続されている。又、ＬＥＤ３，４の他方の端
子には入力信号電圧と同じ電圧ＶＳなる電源が接続され
ている。FIG. 1 is a configuration diagram of a printer head drive circuit in one embodiment of the present invention. In FIG. 1, 1 and 2 are optical couplers such as photointerrupters, photorelays, and photocouplers, and 3 and 4 are LEs in the optical couplers 1 and 2.
D, 5 and 6 are photoswitch elements in the optical couplers 1 and 2, and phototransistors, phototriacs, photothyristors and the like are used. 7, 8 are optical couplers 1,
2 is a protective resistance for limiting the rush current when changing from ON to OFF, and is smaller than the resistance of the printer head 12. Reference numerals 9 and 10 are resistors for allowing an appropriate current to flow through the LEDs 3 and 4, and 11 is an inverter for inverting an input signal. The output side terminals of the optical coupling elements 1 and 2 are connected to power sources of different voltages V 1 and V 2, respectively, and output signals are taken out from the connection points of the protection resistors 7 and 8 to the printer head 12. Is being applied. A power supply having a bias voltage V 3 is connected to the other terminal of the printer head 12. Further, the power supply comprising the same voltage V S and the input signal voltage is connected to the other terminal of LED3,4.
以上のような構成に於いて、以下その動作を説明する。
まず、デジタル入力信号が論理“０”の場合、ＬＥＤ４
には電流が流れ、フォトスイッチ素子６はオン状態とな
る。一方、インバータ１１の出力は論理“１”であるか
ら、ＬＥＤ３には電流が流れずフォトスイッチ素子５は
オフ状態である。したがって、プリンタヘッド１２に印
加される出力信号は、電圧Ｖ２とほぼ同電位となる。次
に、入力信号が論理“１”になった時、ＬＥＤ４には電
流が流れず、ＬＥＤ３には電流が流れる、それ故、フォ
トスイッチ素子５は、オフ状態からオン状態になり、フ
ォトスイッチ素子６はオン状態からオフ状態になる。そ
の過渡期に於いては、フォトスイッチ素子が信号伝搬の
遅延時間をもつ為にフォトスイッチ素子５，６が同時に
オン状態となることがあり、電流が過大に流れ破壊につ
ながるので保護抵抗７，８によりその電流を制限してい
る。過渡期を過ぎると、プリンタヘッド１２に印加され
る出力信号は、電圧Ｖ１とほぼ同電位となる。この様子
を第２図ａ，ｂに示す。このように入力信号の論理
“０”“１”により出力信号はＶ２Ｖ１となる。以
上の説明から明らかなように本実施例によれば入力側と
出力側が完全に分離されているので、第２図ｂのよう
に、入力側の信号を変更せずにＶ１，Ｖ２の極性（正，
負）及び、形態（ＤＣ電圧，ＡＣ電圧，パルス電圧，重
畳電圧等）を自由に変更できる。又、フォトスイッチ素
子５と６は相補型に構成している為に、一方がＯＮ状態
の時は必ず他方がＯＦＦ状態となり、負荷であるプリン
タヘッド以外で消費される電流は非常に小さい。つま
り、出力側回路で消費される電力は少なくなる。The operation of the above arrangement will be described below.
First, when the digital input signal is logic "0", LED4
A current flows through the photoswitch element 6 and the photoswitch element 6 is turned on. On the other hand, since the output of the inverter 11 is logic "1", no current flows through the LED 3 and the photoswitch element 5 is in the off state. Therefore, the output signal applied to the printer head 12 has substantially the same potential as the voltage V 2 . Next, when the input signal becomes the logic "1", no current flows through the LED4 and a current flows through the LED3. Therefore, the photoswitch element 5 is changed from the off state to the on state, and the photoswitch element is turned on. 6 changes from the on state to the off state. In the transition period, the photoswitch elements 5 and 6 may be turned on at the same time because the photoswitch elements have a signal propagation delay time, and an excessive current flow leads to destruction. 8 limits the current. After the transition period, the output signal applied to the printer head 12 has almost the same potential as the voltage V 1 . This state is shown in FIGS. In this way, the output signal becomes V 2 V 1 due to the logic “0” or “1” of the input signal. Since more than According from description as would be apparent to the embodiment the input side and the output side are completely separated, as shown in FIG. 2 b, the V 1, V 2 without changing the input side of the signal Polarity (positive,
Negative) and form (DC voltage, AC voltage, pulse voltage, superposed voltage, etc.) can be freely changed. Further, since the photo switch elements 5 and 6 are of the complementary type, when one is in the ON state, the other is always in the OFF state, and the current consumed by other than the printer head as a load is very small. That is, the power consumed by the output side circuit is reduced.
次に本発明の第２の実施例について説明する。第３図
は、本発明の第２の実施例に於けるプリンタヘッド駆動
回路の構成図である。Next, a second embodiment of the present invention will be described. FIG. 3 is a configuration diagram of a printer head drive circuit according to the second embodiment of the present invention.
第３図に於いて、２１，２２はフォトアイソレータで第
１図に於ける光結合器１，２に相当する。２５，２６は
フォトトランジスタで第１図に於けるフォトスイッチ素
子５，６に相当する。又、入力側では、第１図の入力側
と異なり、論理“１”の時にフォトトランジスタ２５が
ＯＮ状態になるようにインバータ３１を構成してある。
又、この実施例では、フォトスイッチ素子として、ＮＰ
Ｎ型のフォトトランジスタを使っているのでＶ１≧Ｖ２
とする必要がある。In FIG. 3, reference numerals 21 and 22 are photoisolators and correspond to the optical couplers 1 and 2 in FIG. Phototransistors 25 and 26 correspond to the photoswitch elements 5 and 6 in FIG. Also, on the input side, unlike the input side in FIG. 1, the inverter 31 is configured so that the phototransistor 25 is turned on when the logic is "1".
In addition, in this embodiment, as the photoswitch element, NP
Since an N-type phototransistor is used, V 1 ≧ V 2
And need to.
他の部分および動作については第１の実施例と同じであ
るので、第１図と同一符号を付して説明を省略する。Since other parts and operations are the same as those in the first embodiment, the same reference numerals as those in FIG.
発明の効果 以上のように本発明は、プリンタヘッド駆動回路に高耐
圧の光結合器を使い、入力側と出力側とを完全に分離す
ると共に、出力側のフォトスイッチ素子を相補型にする
ことにより、回路の消費電力を小さくし、かつ、印加電
圧の極性，形態に関係ない回路構成とすることができ
る。その上、回路が簡単な為に比較的安価に実現できる
ので、その効果は大きい。As described above, according to the present invention, a high breakdown voltage optical coupler is used in a printer head drive circuit to completely separate the input side and the output side and to make the photoswitch element on the output side complementary. As a result, the power consumption of the circuit can be reduced and the circuit configuration can be made independent of the polarity and form of the applied voltage. Moreover, since the circuit is simple and can be realized at a relatively low cost, the effect is great.
第１図は本発明の第１の実施例におけるプリンタヘッド
駆動回路の構成図、第２図は本発明の第１の実施例にお
けるプリンタヘッド駆動回路の入出力波形図、第３図は
本発明の第２の実施例に於けるプリンタヘッドの駆動回
路の構成図、第４図は従来のプリンタヘッドの駆動回路
の構成図、第５図は従来のプリンタヘッド駆動回路によ
る入出力波形図である。 １，２……光結合器、３，４……ＬＥＤ、５，６……フ
ォトスイッチ素子、７，８……保護抵抗、９，１０……
ＬＥＤ電流制限抵抗、１１，３１……インバータ、１２
……プリンタヘッド、２１，２２……フォトアイソレー
タ、２５，２６……フォトトランジスタ。FIG. 1 is a block diagram of a printer head drive circuit in the first embodiment of the present invention, FIG. 2 is an input / output waveform diagram of the printer head drive circuit in the first embodiment of the present invention, and FIG. 3 is the present invention. Of the second embodiment of the printer head drive circuit, FIG. 4 is a block diagram of a conventional printer head drive circuit, and FIG. 5 is an input / output waveform diagram of the conventional printer head drive circuit. . 1, 2 ... Optical coupler, 3, 4 ... LED, 5, 6 ... Photo switch element, 7, 8 ... Protection resistance, 9, 10 ...
LED current limiting resistance, 11, 31 ... Inverter, 12
...... Printer head 21,22 ...... Photo isolator, 25,26 ...... Photo transistor.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ４１Ｊ 2/30 Ｈ０３Ｋ 17/78 Ｚ 9383−5Ｊ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification number Office reference number FI technical display location B41J 2/30 H03K 17/78 Z 9383-5J
Claims (1)
うち、一方を互いに、負荷に比べ小さな値の抵抗を夫々
介して直列に接続し、夫々の出力端子の他方を、異なっ
た電位の２個の電源に夫々接続し、一方の光結合器と他
方の光結合器の入力側端子には、夫々位相を反転させた
デジタル信号を入力し、前記直列接続した点をプリンタ
ヘッドの一方の入力端子とするプリンタヘッド駆動回
路。1. Out of the two output terminals of each of the two optical couplers, one of them is connected in series with each other through a resistor having a smaller value than a load, and the other of the output terminals is connected to each other. Connected to two power supplies of different potentials, input digital signals with inverted phases respectively to the input side terminals of one optical coupler and the other optical coupler, and connect the points connected in series to the printer. A printer head drive circuit that uses one of the input terminals of the head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59277906A JPH0632972B2 (en) | 1984-12-26 | 1984-12-26 | Printer head drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59277906A JPH0632972B2 (en) | 1984-12-26 | 1984-12-26 | Printer head drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61152459A JPS61152459A (en) | 1986-07-11 |
| JPH0632972B2 true JPH0632972B2 (en) | 1994-05-02 |
Family
ID=17589936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59277906A Expired - Lifetime JPH0632972B2 (en) | 1984-12-26 | 1984-12-26 | Printer head drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0632972B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008054042A (en) * | 2006-08-24 | 2008-03-06 | Yokogawa Electric Corp | Isolated contact output circuit |
| JP2013193390A (en) * | 2012-03-22 | 2013-09-30 | Ricoh Co Ltd | Droplet discharge device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5248957A (en) * | 1975-10-17 | 1977-04-19 | Nippon Intaanashiyonaru Seiriy | Led coupled switching circuit |
| JPS586443U (en) * | 1981-07-03 | 1983-01-17 | 富士通テン株式会社 | Input/output isolated DC signal transmission circuit |
| JPS5827427A (en) * | 1981-08-11 | 1983-02-18 | Hitachi Ltd | Pulse voltage generating circuit |
| JPS6051273B2 (en) * | 1982-09-03 | 1985-11-13 | 株式会社日立製作所 | semiconductor output circuit |
| JPS59143652A (en) * | 1983-02-05 | 1984-08-17 | Konishiroku Photo Ind Co Ltd | Liquid discharge apparatus |
-
1984
- 1984-12-26 JP JP59277906A patent/JPH0632972B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61152459A (en) | 1986-07-11 |
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