JPS6110982A - Dc motor - Google Patents
Dc motorInfo
- Publication number
- JPS6110982A JPS6110982A JP59131434A JP13143484A JPS6110982A JP S6110982 A JPS6110982 A JP S6110982A JP 59131434 A JP59131434 A JP 59131434A JP 13143484 A JP13143484 A JP 13143484A JP S6110982 A JPS6110982 A JP S6110982A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- brushes
- brush
- speed
- voltage
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
- H02P7/288—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using variable impedance
- H02P7/2885—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using variable impedance whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、直流モータにおいて、直流モータ自身が発生
する逆起電圧を取り出すためにブラシを追加して回転数
に応した直）光電圧を得て、速度制御または位置制御の
フィードバックに使用するモータに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a DC motor with a brush added to extract the back electromotive voltage generated by the DC motor itself to obtain a direct photovoltage corresponding to the number of rotations, thereby controlling speed or positioning. Regarding motors used for control feedback.
従来、＋ＴＪ流モータの速度制御を行なう場合、モータ
にタコジェネレータあるいはロータリエンフーグ等を取
りイ４けてモータの回転＠に応じた電圧又はパルスを取
り出していた。直流モータにタコジェネレータ等の速度
検出器を取（＝１けたモータは、全体の形状が大きくな
ったり、タコジェネレータ等のシャフトと直流モータの
軸との芯合せが難しく、また結合部があまいとスリシブ
を起して回転数に応じた発生電圧またはパルス数が得ら
れない欠点があった。Conventionally, when controlling the speed of a +TJ flow motor, a tachometer generator, rotary enhug, etc. was installed on the motor to extract a voltage or pulse according to the rotation of the motor. A speed detector such as a tachometer generator is attached to a DC motor (a single-digit motor has a large overall shape, is difficult to align with the shaft of the tachogenerator, etc., and the axis of the DC motor, and has loose joints). There was a drawback that the generated voltage or number of pulses depending on the rotation speed could not be obtained due to threshing.
「発明が解決しようとする課題」
本発明は、上記の問題に鑑みてなされたものであり、モ
ータの回Ｖ、数に応じて電機子コイルに発生する逆起電
圧をモーフ外部へ取り出すことができる直流モータを提
供することを目的とする。"Problems to be Solved by the Invention" The present invention has been made in view of the above problems, and it is possible to take out the back electromotive force generated in the armature coil to the outside of the morph depending on the number of rotations of the motor. The purpose is to provide a DC motor that can
［課題を解決するための手段］
本発明によれば、ｆＩＳ１図に示すように、直流モータ
の電機子Ｍの界磁Ｆの磁気中性軸付近に配設された正負
の２つのブラシａ 、Ｃと、この２つのブラシａ 、ｃ
の間に角度θを有する位置に配設された第３のブラシｂ
とを有し、第３のブラシｂと正負のブラシａ 、ｃの１
つ（ｃ）は電機子Ｍに通電するためのブラシとして、正
負のブラシａ 、ｃの他の１つ（、）は回転速度又は回
転位置に応じた電圧を検出する手段に結合するためのブ
ラシとして構成された直流モータが提供される。[Means for Solving the Problems] According to the present invention, as shown in the fIS1 diagram, two brushes a, positive and negative, are arranged near the magnetic neutral axis of the field F of the armature M of the DC motor. C and these two brushes a and c
a third brush b disposed at a position having an angle θ between
and a third brush b and positive and negative brushes a and c.
One (c) is a brush for energizing the armature M, and the other one (,) of positive and negative brushes a and c is a brush for coupling to a means for detecting a voltage according to the rotational speed or rotational position. A DC motor configured as follows is provided.
「作用」
本発明の構成によれば、界磁Ｆの磁束を切って電機子Ｍ
が回転することにより、７レミングの右手の法則に従い
該電機子Ｍのブラシａ 、ｃ間に並列に接ａされるコイ
ルにそれぞれ逆起電圧が発生し、かつこの逆起電圧は、
電源Ｅによって１３のブラシｂと負のブラシＣの間に流
れる電機子電流１こ基く電圧降下によっては全部は打ち
消されないため、正負のブラシａ 、ｃ間には電機子Ｍ
の回転数に応じた電工（前記逆起電圧の一部）が発生す
ることを本発明者は見出１７た。"Operation" According to the configuration of the present invention, the magnetic flux of the field F is cut and the armature M
As the armature M rotates, a back electromotive force is generated in the coil a connected in parallel between the brushes a and c of the armature M according to Lemming's right-hand rule, and this back electromotive voltage is
Since the armature current flowing between the 13 brushes b and the negative brush C by the power supply E is not completely canceled out by the voltage drop, the armature current M flows between the positive and negative brushes a and c.
The inventor of the present invention has discovered that an electrical voltage (a part of the back electromotive force) is generated depending on the rotational speed of the motor.
電機子Ｍの発生電圧Ｖａは次の（１）式によって表わさ
ｊする （ブラシの電圧降下は小さくかつ負荷および回
転数によっても変らないため無視する）。The voltage Va generated by the armature M is expressed by the following equation (1).
Ｖａ二に、・Ｎ （１）こ
こで、に、は逆起電圧定数、Ｎは回転数である。Va2, ·N (1) Here, is the back electromotive force constant, and N is the rotation speed.
今、第１図図示の回路におけるブラシＢ 、−議の電圧
Ａｖは、第２図図示の等何回路よりキルヒホッフの法Ｉ
ＩＩに上る式を解くと、次の（２）式により求められる
。Now, the voltage Av of the brushes B, - in the circuit shown in FIG. 1 is determined by Kirchhoff's method I
By solving the equation listed in II, the following equation (2) is obtained.
Ａｖ＝２θ／（π十〇）−Ｖａ＋ｙ／（π十〇）・Ｅ上
記（２）式に（１）式を代入すると、次の（３）式が得
られる。Av=2θ/(π10)−Va+y/(π10)·E By substituting the formula (1) into the above formula (2), the following formula (3) is obtained.
Ａｖ＝２０／（π＋θ）・に、−Ｎ＋ｙｒ／（ｔｒ十〇
）−ＥグラフにするとＭ３図図示の実線のごとくになり
、ブラシａに発生する電圧は回＊ｉａに比例することが
わかる。本発明者は、上記のＷ＋ｆｉ、以外に実験によ
ｔ）ブラシａの電圧を測定したところ、第３図図示の実
線と全く傾向が一致する実測値が得られた。When Av=20/(π+θ)· is plotted as a -N+yr/(tr10)-E graph, it becomes like the solid line shown in the M3 diagram, and it can be seen that the voltage generated at the brush a is proportional to times*ia. In addition to W+fi mentioned above, the inventor of the present invention measured the voltage of the brush a by experiment, and obtained actual measured values whose tendency was completely consistent with the solid line shown in FIG.
「実施例」
本発明を自動車のワイパモータに適用した実施例につい
て、第・１図および第５図を参照して説明する。符号５
で示す速度設定手段では、自動車の車室内に取付けられ
たワイパー速度設定用の可変抵抗ＶＲＩにより与えられ
る連続的に変化する電圧、またはフロントウィンドに設
けられｍ？ｉ！ｌ＋の量を検出する雨滴検出器１０の出
力電圧を、オペアンプＡ３を主要素とする回路で波形整
形および増幅し、適当な速度設定電圧に変換して制御信
号発生手段６に出力する。制御（ｉ号発生手段６は、オ
ペアンプＡ１を主要素とする減算回路６ａと、オペアン
プＡ２を主要素とする比較回路６ｂとから構成されてい
る。ワイパモータ４におけるｔＩＳｌのブラシ１の逆起
電圧は、抵抗■（２３およびコンデンサＣ４で波形整形
されオペアンプＡ１に入力される。そして、前記ブラシ
］の逆起電圧から可変抵抗ＶＲ２で与えられる一定の電
圧を減算しかつ反転して得られる、モータ４の回Ｖ、数
と正比例する４３号がオペアンプＡ１から出力される。"Embodiment" An embodiment in which the present invention is applied to a wiper motor of an automobile will be described with reference to FIGS. 1 and 5. code 5
The speed setting means shown in FIG. i! The output voltage of the raindrop detector 10 that detects the amount of l+ is waveform-shaped and amplified by a circuit whose main element is an operational amplifier A3, converted into an appropriate speed setting voltage, and outputted to the control signal generation means 6. The control (i-number generating means 6 is composed of a subtraction circuit 6a whose main element is an operational amplifier A1, and a comparison circuit 6b whose main element is an operational amplifier A2.The back electromotive voltage of the brush 1 of tIS1 in the wiper motor 4 is , the motor 4 is obtained by subtracting and inverting the constant voltage given by the variable resistor VR2 from the back electromotive voltage of the resistor (23 and the capacitor C4, which shapes the waveform and inputs it to the operational amplifier A1, and the brush). No. 43, which is directly proportional to the number of times V, is output from the operational amplifier A1.
比較回路６ｂでは、オペアンプＡ１の出力電圧と速度設
定手段５の出力電圧（速度設定電圧）とを比較し、速度
設定電圧の方が高ければハイレベルの、速度設定電圧の
方が低ければロウレベルのデノタル信号を電力制御手段
７に出力する。電力制御手段マは、スイッチングトラン
ノスタＴＲ６，ＴＲ７を主要素とするスイッチング回路
であり、トランジスタＴＲ６，ＴＲ７のコレクタがワイ
パモータ４の第３のブラン３（こ＃：続されており、エ
ミフタは接地されている。電池８が第２のブラシ２と接
地の間に接続されている。９は電源スインチである。The comparator circuit 6b compares the output voltage of the operational amplifier A1 and the output voltage (speed setting voltage) of the speed setting means 5, and if the speed setting voltage is higher, it is set to high level, and if the speed setting voltage is lower, it is set to low level. The digital signal is output to the power control means 7. The power control means is a switching circuit having switching transistors TR6 and TR7 as main elements, and the collectors of the transistors TR6 and TR7 are connected to the third branch 3 of the wiper motor 4, and the emitter is grounded. A battery 8 is connected between the second brush 2 and ground. 9 is a power supply switch.
上記ＮＩＩｒｔｉ、によれば、速度設定手段５の可変抵
抗ＶＲＩでワイパモータ４の回転速度を設定しておいて
、電源スイーツチ９を閉じると、最初は、モータ４の第
１のブラシ１の逆起電圧に基くオペアンプＡ１からの出
力電圧よりも上記速度設定電圧の方が高いため、比較回
路６１１がらハイレベルのデジタル信号が電力制御手段
７に出力され、入力側のトランジスタＴＲ５がオンする
ことによりスイッチングトランジスタＴＲ（３，ＴＲ７
にベース電流が供給され、該トランジスタＴＲ６，ＴＲ
７がオンすること１こよって、電池８の正極から電源入
イ・／チ９、第２のブラシ２、モータ４の電機子、第３
のブラシ３、スイッチングトランジスタＴＲ６゜ＴＲ７
、接地へと電流が流れ、ワイパモータ４の回転速度が設
定速度まで上列する。モータ４の回転速度が負荷の減少
等によって設定速度以」１になると、第１のブラシ１に
おける逆起電圧に基いてオペアンプＡ１から出力される
電圧よりも速度設定手段５による速度設定電圧の方が低
くなるため、比較回路６ｂからロウレベルのデジタル信
号が出力され、電力制御手段７のトランジスタＴＲ５゜
ＴＲ６，ＴＲ７がオフし、ワイパモータ４には電流が流
れなくなり、該モータ４の回転数は低下する。そして、
以上の動作を繰返しワイパモータ４が設定速度で回転す
る。しかも、該モータ４の回転数は可変抵抗ＶＲＩによ
って連続的に所要の値に設定できろ。According to the above NIIrti, when the rotation speed of the wiper motor 4 is set with the variable resistor VRI of the speed setting means 5 and the power switch 9 is closed, the back electromotive force of the first brush 1 of the motor 4 is initially Since the speed setting voltage is higher than the output voltage from the operational amplifier A1 based on TR(3,TR7
A base current is supplied to the transistors TR6, TR
7 is turned on 1. Therefore, the power is turned on from the positive terminal of the battery 8./9, the second brush 2, the armature of the motor 4, the
brush 3, switching transistor TR6゜TR7
, a current flows to ground, and the rotational speed of the wiper motor 4 increases to the set speed. When the rotational speed of the motor 4 becomes less than the set speed due to a decrease in load, etc., the speed setting voltage by the speed setting means 5 is higher than the voltage output from the operational amplifier A1 based on the back electromotive force in the first brush 1. becomes low, a low-level digital signal is output from the comparator circuit 6b, transistors TR5, TR6, and TR7 of the power control means 7 are turned off, current no longer flows to the wiper motor 4, and the rotation speed of the motor 4 decreases. . and,
The above operation is repeated until the wiper motor 4 rotates at the set speed. Moreover, the rotation speed of the motor 4 can be continuously set to a desired value by the variable resistor VRI.
速度設定手段５にｆ５ける切換スイッチＳＷｉ力・雨滴
検出器１０側へ切換元、電源スィッチ９を閉じた場合に
は、該雨滴検出器１０によって検出される雨滴が無い間
は速度設定手段５の出力電圧は零であるためワイパモー
タ４は回転ぜず、前記雨滴検出器１０によって少量のｍ
滴が検出されると速度設定手段５からは低い速度設定電
圧が発生されるため、ワイパモータ４が低速度で回転し
、雨滴検出器１０で多端の雨滴が検出されると、辺７′
：（設定手段５から高い速度設定電圧が発生されるため
、ワイパモータ４は高速度で回転−する。つ主り、ｉ１
′ｉＪ滴検出器１０によって検出されろ雨滴の旦に応じ
て連続的１こかつ自動的にワイパ千−り４の回転速度を
変化させることができる、
ワイパモータの速度を制御するためには従来はＰＩＳ６
図（＠シｒｙ１）に示すごとく、低速用ス・ｆフチ１０
および高速用スイッチ１１を、それぞ九フィバモータ１
２の低速用ブラシ１３および高速用ブラシ１４とアース
の間に接続し、これらのスイッチ１０．１１を切換える
ようにしていたので、ワイパモータ１２の回転速度を低
速と高速の二段階にしか変化させることができなかった
が、本第−の実施例によれば、ワイパモータの速度を雨
滴の量に応して連続して変化させることができる利点が
あり、自動車の車速および降雨の状態に対応した広範囲
なワイパモータ速度による最適な速度制御を行うことが
できる。また、この第一の実施例によれば、制御信号発
生手段６が比較回路６ｂからなり、電力制御手段７がス
イッチング回路から構成されているので回路が簡単にな
る利点があり、また電力制御手段７での電力損失が少い
利点がある。When the speed setting means 5 switches f5 to the power/raindrop detector 10 side, and the power switch 9 is closed, the speed setting means 5 changes as long as there are no raindrops detected by the raindrop detector 10. Since the output voltage is zero, the wiper motor 4 does not rotate, and a small amount of m is detected by the raindrop detector 10.
When a drop is detected, a low speed setting voltage is generated from the speed setting means 5, so that the wiper motor 4 rotates at a low speed.
:(Since a high speed setting voltage is generated from the setting means 5, the wiper motor 4 rotates at a high speed.
The rotational speed of the wiper motor 4 can be continuously and automatically changed according to the number of raindrops detected by the iJ droplet detector 10. Conventionally, to control the speed of the wiper motor, PIS6
As shown in the figure (@shiry1), low speed S・F border 10
and the high speed switch 11, respectively, and the nine fiber motor 1.
Since the wiper motor 12 is connected between the low-speed brush 13 and the high-speed brush 14 of No. 2 and the ground, and these switches 10 and 11 are switched, the rotational speed of the wiper motor 12 can only be changed in two stages: low speed and high speed. However, according to the present embodiment, there is an advantage that the speed of the wiper motor can be continuously changed according to the amount of raindrops. Optimum speed control can be performed using the wiper motor speed. Further, according to the first embodiment, the control signal generating means 6 is composed of a comparison circuit 6b, and the power control means 7 is composed of a switching circuit, which has the advantage of simplifying the circuit. 7 has the advantage of less power loss.
「その他の実施例」
第一の実施例では、ワイパモータの速度制御について説
明したが、本発明はウインドレギュレ」クモータの速度
制御、又は速度を積分して回転位置の制御に利用するこ
とももちろん可能である。"Other Embodiments" In the first embodiment, the speed control of the wiper motor was explained, but the present invention can also be used to control the speed of the wind regulator motor or to control the rotational position by integrating the speed. It is.
そして、この位置の制御に際して可変抵抗器、トランジ
スタなどを包含する位置検出器が不要となる利点がある
。Further, there is an advantage that a position detector including a variable resistor, a transistor, etc. is not required when controlling this position.
なお、本発明は、円筒形の整流子を有する」二記ワイパ
モータ、パンケークモータなどだけではなく、平面形の
接触面を持つ面整流子を有したモータに適用することが
でき、また、整流子を持つことなくブラシを直接に電機
子コイルに接触させるプリントモータにも適用すること
ができ、さらにブラシを有する一般の大型または小型の
ｉ（（流モータにももちろん適用できる。Note that the present invention can be applied not only to wiper motors and pancake motors that have a cylindrical commutator, but also to motors that have a planar commutator that has a planar contact surface. It can also be applied to a print motor in which the brush is brought into direct contact with the armature coil without having a child, and it can of course also be applied to a general large or small i((flow) motor that has a brush.
「発明の効果」
以上述べたごとく、本発明は上記の構成を有するから、
モータの回転数に応じて電機子フィルに発生する逆起電
圧をモーフ外部へ取り出すことができ、直流モータにタ
コノエネレータなどの速度検出器、または位置検出器を
取（１ｊけることなく回転速度、又は回転位置などの制
御が可能となるという優れた効果がある。"Effects of the Invention" As stated above, since the present invention has the above configuration,
The back electromotive force generated in the armature fill according to the motor rotation speed can be taken out to the outside of the morph. This has the excellent effect of making it possible to control the rotational position, etc.
第１図は本発明の詳細な説明に供する回路図、第２図は
第１図の等価回路図、第３図は特性線図、第４図および
第５図は本発明の第一の実施例を表わすプロ／り図およ
び回路図、第６図は参考図である。
１．２．３・・・第一・、第二、第二のブラシ、４・・
ワイパモータ、５・・・速度設定゛手段、６・・・制御
信号発生手段、７・・・電力制御手段、８・・・電池、
９・・・電源スィッチ、１０・・・低速用スイッチ、１
１・・・高速用スイッチ、１２・・・ワイパモータ、１
３・・・低速用ブラシ、１４・・・高速用ブラシ、ａ、
ｂ、ｃ・・・ブラシ、Ｅ・・・電源、Ｆ・・・界磁、θ
・・・ブｒシ角度、Ｒａ・・電機子コイルの抵抗、Ｖａ
・・・モータ発生電圧（逆起電圧）。
第１ 回
第２０FIG. 1 is a circuit diagram providing a detailed explanation of the present invention, FIG. 2 is an equivalent circuit diagram of FIG. 1, FIG. 3 is a characteristic diagram, and FIGS. 4 and 5 are a first embodiment of the present invention. The professional diagram and circuit diagram representing an example, FIG. 6, is a reference diagram. 1.2.3...first, second, second brush, 4...
Wiper motor, 5... Speed setting means, 6... Control signal generating means, 7... Power control means, 8... Battery,
9...Power switch, 10...Low speed switch, 1
1... High speed switch, 12... Wiper motor, 1
3...Low speed brush, 14...High speed brush, a,
b, c...brush, E...power supply, F...field, θ
...R brush angle, Ra...armature coil resistance, Va
...Motor generated voltage (back electromotive force). 1st 20th
Claims (2)
ブラシと、この２つのブラシの間に角度を有する位置に
配設された第３のブラシとを有し、この第３のブラシと
前記正負のブラシの１つは電機子に通電する電源を含む
回路に接続し、前記正負のブラシの他の１つは回転速度
又は回転位置に応じた電圧を検出する手段に結合するこ
とを特徴とする直流電動機(1) It has two brushes, positive and negative, arranged near the magnetic neutral axis of the field, and a third brush arranged at an angular position between these two brushes. 3 and one of the positive and negative brushes is connected to a circuit including a power source that energizes the armature, and the other one of the positive and negative brushes is connected to means for detecting a voltage according to the rotational speed or rotational position. A DC motor characterized by
シ間に発生した電圧に基づく信号とを比較して制御信号
を発生する制御信号発生手段が、前記正負のブラシの前
記他の１つのブラシに結合され、その制御信号に従って
作動する電力制御手段が、前記第３のブラシと前記正負
のブラシの前記１つの間に接続された特許請求の範囲第
１項記載の直流電動機。(2) Control signal generating means for generating a control signal by comparing the speed setting signal of the speed setting means and a signal based on the voltage generated between the positive and negative brushes, 2. The DC motor of claim 1, wherein power control means coupled to the brushes and operative in accordance with control signals thereof are connected between the third brush and the one of the positive and negative brushes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59131434A JPH0750991B2 (en) | 1984-06-26 | 1984-06-26 | DC motor controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59131434A JPH0750991B2 (en) | 1984-06-26 | 1984-06-26 | DC motor controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6110982A true JPS6110982A (en) | 1986-01-18 |
| JPH0750991B2 JPH0750991B2 (en) | 1995-05-31 |
Family
ID=15057869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59131434A Expired - Fee Related JPH0750991B2 (en) | 1984-06-26 | 1984-06-26 | DC motor controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0750991B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54101267A (en) * | 1978-01-27 | 1979-08-09 | Hitachi Ltd | Lead frame |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4881025A (en) * | 1972-02-02 | 1973-10-30 | ||
| JPS511001A (en) * | 1974-06-21 | 1976-01-07 | Nippon Electric Co | |
| JPS6038098U (en) * | 1983-08-20 | 1985-03-16 | 三菱電機株式会社 | wiper control device |
-
1984
- 1984-06-26 JP JP59131434A patent/JPH0750991B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4881025A (en) * | 1972-02-02 | 1973-10-30 | ||
| JPS511001A (en) * | 1974-06-21 | 1976-01-07 | Nippon Electric Co | |
| JPS6038098U (en) * | 1983-08-20 | 1985-03-16 | 三菱電機株式会社 | wiper control device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54101267A (en) * | 1978-01-27 | 1979-08-09 | Hitachi Ltd | Lead frame |
| JPS6238862B2 (en) * | 1978-01-27 | 1987-08-20 | Hitachi Ltd |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0750991B2 (en) | 1995-05-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |