JPS58219070A - Driving circuit for magnetic head - Google Patents
Driving circuit for magnetic headInfo
- Publication number
- JPS58219070A JPS58219070A JP10237182A JP10237182A JPS58219070A JP S58219070 A JPS58219070 A JP S58219070A JP 10237182 A JP10237182 A JP 10237182A JP 10237182 A JP10237182 A JP 10237182A JP S58219070 A JPS58219070 A JP S58219070A
- Authority
- JP
- Japan
- Prior art keywords
- head
- voltage
- winding
- transformer
- coil
- 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
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
- B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
- B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
- B41J2/30—Control circuits for actuators
Landscapes
- Dot-Matrix Printers And Others (AREA)
- Impact Printers (AREA)
Abstract
Description
【発明の詳細な説明】 される電磁ヘッドの駆動回路に関する。[Detailed description of the invention] The present invention relates to a drive circuit for an electromagnetic head.
牙１図は従来の電導ヘッドの駆動回路の一例を示す回路
図である。FIG. 1 is a circuit diagram showing an example of a drive circuit for a conventional conductive head.
従来の電磁ヘッドの駆動回路は第１図に示すように電磁
ヘッド１のコイル２の一端が電源５に、他端が駆動トラ
ンジスタ６のコレクタに接続され、コイル２の両端間に
トランジスタ６がオンしたとき、逆バイアスされる方向
にダイオード７が接続された構成である。In the conventional electromagnetic head drive circuit, as shown in FIG. 1, one end of the coil 2 of the electromagnetic head 1 is connected to a power source 5, the other end is connected to the collector of a drive transistor 6, and the transistor 6 is turned on between both ends of the coil 2. In this case, the diode 7 is connected in the direction in which it is reverse biased.
この駆動回路はトランジスタ６をオンにするとコイル２
に電流が流れ、コイル２の中心にある磁心３が磁化して
可動切片４を吸着し、ニードル２０を動かす。This drive circuit turns on the coil 2 when the transistor 6 is turned on.
When a current flows through the coil 2, the magnetic core 3 at the center of the coil 2 becomes magnetized and attracts the movable section 4, thereby moving the needle 20.
トランジスタ６をオフにすると、それまでコイル２に流
れていた電流が正まり、磁心３の磁化が消滅し可動切片
２がバネの力により磁心３よυ離脱させられる。When the transistor 6 is turned off, the current flowing through the coil 2 is corrected, the magnetization of the magnetic core 3 disappears, and the movable segment 2 is separated from the magnetic core 3 by the force of the spring.
原理的には電気エネルギを磁気エネルギに変換した上で
さらに運動エネルギに変換するものである。In principle, electrical energy is converted into magnetic energy and then further converted into kinetic energy.
この駆動回路は、トランジスタ６をオフにするとコイル
２の自己誘導によシトランジスタロに高電圧がかかるた
め、ダイオード７によって自己誘導による電流番熱エネ
ルギに変換し、高電圧を吸収している。In this drive circuit, when the transistor 6 is turned off, a high voltage is applied to the transistor due to the self-induction of the coil 2, so the diode 7 converts the current into thermal energy due to self-induction and absorbs the high voltage.
このダイオードの作用は自己誘導がコイル２中の磁束の
変化によシ生ずる磁気エネルギであるから、運動エネル
ギに変換されなかった磁気エネルギを熱エネルギとして
捨てていることになる。Since the action of this diode is magnetic energy generated by self-induction due to changes in magnetic flux in the coil 2, the magnetic energy that has not been converted into kinetic energy is discarded as thermal energy.
従来、この種の電磁ヘッドでは高速で駆動すると、磁気
・運動エネルギ変換効率が低下するための上記理由から
ヘッ′ドの消費電力がますます大きくなり、その熱損失
による発熱のため放熱器を必要としていた。 さらには
高温による材料劣化によりヘッドの寿命も短かくなると
いう欠点があった。Conventionally, when this type of electromagnetic head is driven at high speed, the power consumption of the head increases due to the above-mentioned reason because the magnetic/kinetic energy conversion efficiency decreases, and a radiator is required to generate heat due to heat loss. It was. Another drawback is that the life of the head is shortened due to material deterioration due to high temperatures.
本発明の目的は、上述の欠点を取除き電力効率が高く、
ヘッドコイルの発熱の少ない電磁ヘッドの駆動回路を提
供することにある１、前記目的を達成するために１本発
明による電磁ヘッド駆動回路は、電磁ヘッド内の全ての
コイルの一端を電源に、他端をそれぞれ対応するスイッ
チ素子に接続した駆動回路と、少なくとも２巻線または
２巻線に相当する巻線を有し、第１巻線の両端をダイオ
ードを介して前記電源に接続し、第２巻線の一端を前記
電源の一端そに、他端をそれぞれダイオードを介して前
記各コイルのスイッチ素子が接続されている側の一端に
接続した変成器とを具備し、前記各コイルによって発生
する磁気エネルギのうち、電磁ヘッドの運動エネルギに
変換されない残余磁気エネルギを電気エネルギに変換し
電源に戻すように構成しである。The purpose of the present invention is to eliminate the above-mentioned drawbacks, provide high power efficiency,
An object of the present invention is to provide an electromagnetic head drive circuit in which the head coil generates less heat. In order to achieve the above object, the electromagnetic head drive circuit according to the present invention uses one end of all the coils in the electromagnetic head as a power source, and the other end as a power source. It has a drive circuit whose ends are connected to respective switch elements, and at least two windings or a winding corresponding to the two windings, both ends of the first winding are connected to the power supply via a diode, and a second winding is connected to the power supply through a diode. a transformer in which one end of a winding is connected to one end of the power supply and the other end is connected to one end of each of the coils to which the switch element is connected via a diode, and the transformer is provided with Of the magnetic energy, the remaining magnetic energy that is not converted into kinetic energy of the electromagnetic head is converted into electrical energy and returned to the power source.
前記構成によれば、電力効率が高くなるとともにヘッド
コイルの発熱量が減少し、本発明の目的は完全に達成さ
れる。According to the above configuration, the power efficiency is increased and the amount of heat generated by the head coil is reduced, so that the object of the present invention is completely achieved.
以下、図面を参照して本発明をさらに詳しく説明する。Hereinafter, the present invention will be explained in more detail with reference to the drawings.
第２図は本発明による電磁ヘッド駆動回路の一実施例を
示す回路図である。FIG. 2 is a circuit diagram showing an embodiment of an electromagnetic head drive circuit according to the present invention.
駆動する電磁ヘッド１のｎ個のコイル９−１〜９−ｎの
一端は電源５のプラス端子に、他端はそれぞれ対応する
ｎ個のトランジスタ１０−１〜１０−ｎのコレクタに接
続されている。One end of the n coils 9-1 to 9-n of the electromagnetic head 1 to be driven is connected to the positive terminal of the power source 5, and the other end is connected to the collector of the corresponding n transistors 10-1 to 10-n. There is.
２巻線を巻装した変成器１１０第１巻線１２の巻始めＢ
は第１のダイオード１４を介して接地され、前記第１巻
線１２の巻終り１５と第２巻線１６の巻始め１７は電源
５のプラスに接続され、第２巻線１６の巻終り１８はそ
れぞれ牙２〜牙（ｎ＋１）のダイオード１９−１〜１９
−ｎを介して牙１〜牙ｎのトランジスタ１０−１〜１０
−ｎに接続されている。Transformer 110 with two windings wound at the beginning of winding B of the first winding 12
is grounded via the first diode 14, the end 15 of the first winding 12 and the beginning 17 of the second winding 16 are connected to the positive terminal of the power supply 5, and the end 18 of the second winding 16 is connected to the positive terminal of the power supply 5. are the diodes 19-1 to 19 of Fang 2 to Fang (n+1), respectively.
Transistors 10-1 to 10 of fang 1 to fang n through -n
- connected to n.
牙１のダイオード１４は定常状態において逆バイアスさ
れるような極性で、第２〜牙（ｎ＋１）１９−１〜１９
−ｎのダイオードはトランジスタ１〇−１〜１０−ｎが
オンのとき逆バイアスされるような極性で挿入されてい
る。The diode 14 of fang 1 is polarized such that it is reverse biased in steady state, and
The -n diode is inserted with a polarity such that it is reverse biased when the transistors 10-1 to 10-n are on.
簡単なため動作の説明に当っては、ヘッドコイル一つだ
けについて説明する。For simplicity, in explaining the operation, only one head coil will be explained.
トランジスタ１０−１がオンすると、ヘッドコイル９−
１に励磁電流が流れ、この電流によシヘツトコイル９−
１中の磁心が磁化し、ヘッドの図示しない可動切片が吸
着されドツトを打つ。When the transistor 10-1 is turned on, the head coil 9-
1, and this current causes the seat coil 9-
The magnetic core in 1 becomes magnetized, and a movable section (not shown) of the head is attracted and strikes a dot.
なお、このとき全てのダイオード１４．１９−１〜１９
−ｎは逆バイアスされているので、変成器１１の第１、
第２巻線１２．１６には電流は流れない。In addition, at this time, all diodes 14.19-1 to 19
-n is reverse biased, so the first of transformer 11,
No current flows through the second winding 12.16.
次にトランジスタ１０−１がオフになると、ヘッドコイ
ル９−１にはそのインダクタンスのために逆起電力■が
生じ、ある値の電圧をコレクタに印加するとともに、第
２のダイオード１９−１が順方向にバイアスされるため
、変成器１１０第２巻線１６１７Ｃもほぼ等しい電圧Ｖ
が印加される。Next, when the transistor 10-1 is turned off, a back electromotive force (■) is generated in the head coil 9-1 due to its inductance, and a voltage of a certain value is applied to the collector, and the second diode 19-1 is turned off in turn. Because the transformer 110 second winding 1617C is biased in the direction, the transformer 110 second winding 1617C also has an approximately equal voltage
is applied.
かりに変成器の牙１、第２巻線１２．１６の巻数比が１
：１とすると、第２巻線１６に印加された電圧と等しい
電圧Ｖが牙１巻線１２にも生ずる。However, the turns ratio of the transformer fang 1 and the second winding 12.16 is 1.
:1, a voltage V equal to the voltage applied to the second winding 16 is also generated in the first winding 12.
もし、この電圧Ｖが電源５の電圧よシ少しでも高いと第
１のダイオード１４は順方向にバイアスされ、電源５側
に電力を戻す方向に流れる。If this voltage V is even slightly higher than the voltage of the power source 5, the first diode 14 will be biased in the forward direction, and the current will flow in the direction of returning the power to the power source 5 side.
すなわち、運動エネルギに変換されない余分の磁気エネ
ルギが電気エネルギに変換され電源に戻される。That is, excess magnetic energy that is not converted into kinetic energy is converted into electrical energy and returned to the power source.
次忙他のヘッドコイルが動作したときを考えると、先に
述べたように変成器１１０牙２巻線１６の両端間の電圧
は電源５の電圧にほぼ等しい電圧以下に押えられるため
、その他のヘッドコイル９−２〜９−ｎ（７）磁気エネ
ルギも１ｌｔｆｉエネルキとして電源５に戻される。Considering the case when other head coils operate, as mentioned earlier, the voltage across the transformer 110 fan 2 winding 16 is suppressed below a voltage approximately equal to the voltage of the power supply 5, so the other head coils operate. The magnetic energy of the head coils 9-2 to 9-n (7) is also returned to the power source 5 as 1ltfi energy.
さらに、トランジスタ１ｏ−１・四囲１ｏ−ｎのコレク
タ電圧を考えるとそのピーク電圧は（電源電圧）＋（第
２巻線の両端電圧）であシ、電源電圧の２倍に＃１は等
しい値となる。Furthermore, considering the collector voltage of transistor 1o-1 and square 1o-n, its peak voltage is (power supply voltage) + (voltage across the second winding), and #1 is equal to twice the power supply voltage. becomes.
以上、スイッチ素子についてはトランジスター電磁ヘツ
、ドについては磁化された磁心に可動片が吸引され、可
動片の先端によってニードルを動作させるもの、また変
成器については２巻線が巻かれたものを使用して実施例
を説明したが、スイッチ素子、電磁ヘッドは他の種類で
もよく、変成器はタップ付の単巻のもの（２巻線に相当
するもの）でも同様に実現できる。As mentioned above, the switch element uses a transistor electromagnetic head, the switch element uses a movable piece that is attracted to a magnetized magnetic core, and the needle is operated by the tip of the movable piece, and the transformer uses a type with two windings. Although the embodiment has been described, the switch element and the electromagnetic head may be of other types, and the transformer may be a tapped single-turn type (equivalent to two windings).
また、当然ながら変成器の巻始めと巻終シは牙１、第２
巻線それぞれ逆でもよく、さら忙はスイッチ素子は定電
流駆動でもチョッパ駆動でもよい。Also, of course, the beginning and end of the transformer are Fang 1 and 2.
The windings may be reversed, and the switching element may be driven by a constant current or a chopper.
以上、詳しく説明したよ・うに本発明による電磁ヘッド
の駆動回路は各コイルの電流を遮断したときに発生する
逆起電力を、それぞれダイオードを介して、変成器の第
２巻線に印加し、その印加された電圧に対応して発生す
る第１巻線の電圧を電源に戻すように構成することによ
シ、運動エネルギに変換されなかった磁気エネルギを電
源に回収できるので、電磁ヘッドの発熱は減少し、ヘッ
ドの寿命は延び、小形で高性能のプリンタが実現できる
。As explained above in detail, the electromagnetic head drive circuit according to the present invention applies the back electromotive force generated when the current in each coil is cut off to the second winding of the transformer via the respective diodes, By configuring the first winding to return the voltage generated in the first winding in response to the applied voltage to the power source, the magnetic energy that has not been converted into kinetic energy can be recovered to the power source, which generates heat in the electromagnetic head. The head life is reduced, the life of the head is extended, and a compact, high-performance printer can be realized.
第１図は従来の？Ｉｔ磁ヘッド駆動回路の一例を示す回
路図、第２図は本発明による電磁ヘッド駆動回路の一実
施例を示す回路図である。
１・・・電磁ヘッド
２．９ １．９−２、・・・・・９−ｎ・・・ヘッドコ
イル
３・・・磁心 ４・・・可動切片５・・・電
源
６．１０−１、・−・・１１０−ｎ・・・トランジスタ
７．１４．１９−１、・・・・１９−ｎ・・・ダイオー
ド１１・・・変成器 １２．１６・・・巻線１
３．１７・・・巻始め １５．１８・・・巻終り２
０・・・ニードル
特許出願人 日本電気株式会社Is Figure 1 conventional? FIG. 2 is a circuit diagram showing an example of an electromagnetic head drive circuit according to the present invention. 1... Electromagnetic head 2.9 1.9-2,...9-n... Head coil 3... Magnetic core 4... Movable piece 5... Power supply 6.10-1, ...110-n...Transistor 7.14.19-1,...19-n...Diode 11...Transformer 12.16...Winding 1
3.17...Start of volume 15.18...End of volume 2
0...Needle patent applicant NEC Corporation
Claims (1)
れぞれ対応するスイッチ素子に接続した駆動回路と、少
なくとも２巻線または２巻線に相当する巻線を有し、牙
１巻線の両端をダイオードを介して前記電源に接続し、
第２巻線の一端を前記電源の一端子に、他端をそれぞれ
ダイオードを介して前記各コイルのスイッチ素子が接続
されている側の一端に接続した変成器とを具備し、前記
各コイルによって発生する磁気エネルギのうち電磁ヘッ
ドの運動エネルギに変換されない残余磁気エネルギを電
気エネルギに変換し電源に戻すように構成した電磁ヘッ
ド駆動回路。It has a drive circuit in which one end of all the coils in the electromagnetic head is connected to a power source and the other end is connected to a corresponding switch element, and at least two windings or a winding equivalent to two windings, and one winding of the first winding. Both ends are connected to the power supply via a diode,
a transformer having one end of a second winding connected to one terminal of the power supply and the other end connected to one end of each of the coils to which the switch element is connected via a diode; An electromagnetic head drive circuit configured to convert residual magnetic energy that is not converted into kinetic energy of the electromagnetic head into electrical energy and return it to a power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10237182A JPS58219070A (en) | 1982-06-15 | 1982-06-15 | Driving circuit for magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10237182A JPS58219070A (en) | 1982-06-15 | 1982-06-15 | Driving circuit for magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58219070A true JPS58219070A (en) | 1983-12-20 |
Family
ID=14325596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10237182A Pending JPS58219070A (en) | 1982-06-15 | 1982-06-15 | Driving circuit for magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58219070A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1093925A2 (en) * | 1999-10-22 | 2001-04-25 | Seiko Epson Corporation | Head drive circuit for impact dot printer |
| US6733195B2 (en) | 1999-10-22 | 2004-05-11 | Seiko Epson Corporation | Head drive circuit for impact dot printer |
-
1982
- 1982-06-15 JP JP10237182A patent/JPS58219070A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1093925A2 (en) * | 1999-10-22 | 2001-04-25 | Seiko Epson Corporation | Head drive circuit for impact dot printer |
| EP1093925A3 (en) * | 1999-10-22 | 2001-08-22 | Seiko Epson Corporation | Head drive circuit for impact dot printer |
| US6659663B1 (en) | 1999-10-22 | 2003-12-09 | Seiko Epson Corporation | Head drive circuit for impact dot printer |
| US6733195B2 (en) | 1999-10-22 | 2004-05-11 | Seiko Epson Corporation | Head drive circuit for impact dot printer |
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