JPS5923067A - Capacitor charging and discharging type ignition device - Google Patents
Capacitor charging and discharging type ignition deviceInfo
- Publication number
- JPS5923067A JPS5923067A JP13301182A JP13301182A JPS5923067A JP S5923067 A JPS5923067 A JP S5923067A JP 13301182 A JP13301182 A JP 13301182A JP 13301182 A JP13301182 A JP 13301182A JP S5923067 A JPS5923067 A JP S5923067A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- transistor
- circuit
- ignition
- time
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P11/00—Safety means for electric spark ignition, not otherwise provided for
- F02P11/02—Preventing damage to engines or engine-driven gearing
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Electrical Control Of Ignition Timing (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はコンデンサ充放可1式点火装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single type ignition device capable of charging and discharging a capacitor.
昭和56年!¥′f訂願第140’1CIB号では、エ
ンジンの出力11を性に適合する如く点火時期(角度)
をエンジン回転数が所要設定数範囲内では回転数計の上
列に応じて(比例して)点火時期(角IE、 )を進め
、又該範囲以下及び範囲を超えた回転数の時は夫々一定
の最少点火角度及び最大点火角度特性をKnることの可
能な安価経済的な点火装置を明らかにした。この点火装
置の一実施例で11、パル日ノコイルの正パルス信号(
宿1圧)の立−ヒリに同期して最大点火角度特性を得又
狗パルス分信号の立上りに同期して最少点火特性をも)
でいるがこの点火特性即ち点火時期はいづれもエンジン
の上死点前に設定されているため回転数が設定範囲以下
等の特に但い場合に点火後ピストンが上死点を越す事が
できず該ピストンが逆に押し戻される所謂ケアチン現象
を起こし危険である笠の問題があった。本発明は」−記
の点を鑑みエンジン始動時等の特に低回転域で安定した
点火特性を得ることの可能な点火装置を提供するもので
ある。以下図面を用いて本発明の詳細な説明する。第1
図、第2図及び第3図は夫々本発明の一実施例回路図1
、その各部動作波により回転する磁石式発電機等の発電
コイル、11は整流用ダイオード、12は前記発1「、
コイル10の発生電圧により前記ダイオード11を介し
て充?[イ、される点火電源用コンデ74月’aは後述
するゲート回路を介して導通するサイリスタで、これに
より前記コンデンサ12の充電々荷を点火コイル14に
放電せしめ、その2汐巻線14−2を介して点火栓15
1こ火花を発生ずる。また、ダイオード18は外部端子
21がらの逆流防止用ダイオードであり、ダイオード1
9は発11f5コイル1oの出力1(L圧が図示の4i
性とは逆の極性になったときにその出力を短絡するため
の短絡用ダイオードである。以」二で主回路Iを構成す
る。次に、2oは予め設定された所定の点火角度の信号
電圧を発生ずる点火信号発生コイル(以下パルサコイル
)である。また、夏腫、■、■は前記主回路部1の制御
回路部で、夏は鋸歯状波発生回路、璽は衝撃波発生回路
、■は比較器、■はゲート回路、Iaはスイッチ回路、
Ibは電源部、■は本発明の要部を形成する遅角回路で
)も及びCは時定数設定用の抵抗及波数(回転数)検出
回路を形成する。次に。5、Q、は制御用トランジスタ
、T1. 、 、 (−)、、は微分ご
回路を形成する抵抗及びコンデンサー、D ill、
4.Kl止川用イオードである。以上て制M11回路を
+i4成する。次に1611作について、第2図及び第
3図を参照して説明する。なお、上記回路!乃至Vli
既提案回路(特願昭56−140903号)と同一であ
、りその動作は委する(こ、エンジン回転数が設定範囲
に達しない時(第3図N、以下)は、パルサコイル20
の48号が正の期間(第21′¥Ia−■)において、
回路■の出カVIt圧即ちコンデンーリ24の電圧(点
但))は予め回路■の出力電圧R11ぢコンデンサ46
の亀用(点(1)l )より高位になる如く設定されて
いるため比i1i+;回路■のトランジスタ51は逆バ
イアスされてオフ状態にある。そこで、パルサコイル2
oに負の信号(第2図a−■)が発生ずると、その立上
りに同期して回路■のトランジスタ26 カ導ylN
シて、コンデンサ−24はトランジスタ26を介して放
電して、その11号位が低下する。従って、上キ記負の
信号が到来した時点で該トランジスタ5工は;jI−3
171し、ゲート回路Vのトランジスタ61及び62を
オンにしてコンデンサ41→トランジスタ62→ザイリ
スタ13のゲートの経路でゲ−+−tit流が流れ、該
サイリスタ13をオンにする。従って比較回路■はパル
サコイルの所定角度に設定された負1の信号の立上りに
同期して出力(第2図f−■)をゲートに送出する結果
負パルスにより設定された一定角度の最少点火時期(−
0゜)においてコンデンサー2は放i11. L火θ
花を4トしせしめる。(第3図(a))又エンジン回転
数が設定範囲の時(第3図N、−N、)はエンジン回転
数の−L昇に伴いコンデン→J−24の電圧は低下し、
比較回路■においては、点(ト))1イ、圧が点(1)
) 電、比以下になる時期が早まり該トランジスタ51
の導通時期が早くなる。即ち上記動作で(コパルザコイ
ル20が負の信号を発生した時)υ1(角度)にトラン
ジスタ51は導通したが、設定回路截Nlを超すとエン
ジン回転数の十昇に比例して、サイリスタ13の点火時
期が早まり、点火時期は早く所罷進f!jずろ。(第3
図Q)) )さらに、設定範囲の回転数N、を逸脱する
と、該コンデンサ24はトランジスタ26を介しての放
電回路形成力”1度が更に高くなるため、抵抗25を通
しての電圧上列の立」2六が更に緩やかワ
になり該コンデン→J“24の可、圧(点0C))はコ
ンデンーリ46の′In、圧(点(r)l )より常に
低位となる。1981! ¥'f Revised Application No. 140'1 CIB adjusts the ignition timing (angle) to suit the engine output 11.
When the engine speed is within the required set number range, the ignition timing (angle IE, ) is advanced (proportionally) according to the upper row of the tachometer, and when the engine speed is below or above the range, the ignition timing (angle IE, ) is advanced (in proportion) A low-cost and economical ignition device capable of achieving constant minimum ignition angle and maximum ignition angle characteristics has been revealed. In one embodiment of this ignition device, 11, the positive pulse signal of the pal hino coil (
The maximum ignition angle characteristic is obtained in synchronization with the rise and fall of the pressure (1 pressure), and the minimum ignition characteristic is also obtained in synchronization with the rise of the dog pulse signal).
However, this ignition characteristic, that is, the ignition timing, is set before the top dead center of the engine, so in special cases such as when the rotation speed is below the set range, the piston cannot go beyond the top dead center after ignition. There was a problem with the cap, which is dangerous because it causes the so-called care-tin phenomenon in which the piston is pushed back. In view of the above points, the present invention provides an ignition device that can obtain stable ignition characteristics particularly in a low rotation range such as when starting an engine. The present invention will be described in detail below using the drawings. 1st
2 and 3 are circuit diagrams 1 of one embodiment of the present invention, respectively.
, each part thereof has a power generating coil such as a magnetic generator that rotates by operating waves, 11 is a rectifying diode, 12 is the generator 1,
Charged via the diode 11 due to the voltage generated by the coil 10? [B. The ignition power supply capacitor 74'a is a thyristor that conducts through a gate circuit to be described later, which discharges the charge of the capacitor 12 to the ignition coil 14, and the second winding 14-a. 2 through spark plug 15
Generates one spark. In addition, the diode 18 is a diode for preventing backflow from the external terminal 21, and the diode 18 is a diode for preventing backflow from the external terminal 21.
9 is the output 1 of the generator 11f5 coil 1o (L pressure is 4i shown in the figure)
This is a short-circuit diode that short-circuits the output when the polarity is opposite to that of the output. The following constitutes the main circuit I. Next, 2o is an ignition signal generating coil (hereinafter referred to as a pulsar coil) that generates a signal voltage at a predetermined ignition angle. In addition, summer, ■, ■ are the control circuit sections of the main circuit section 1, summer is a sawtooth wave generation circuit, the seal is a shock wave generation circuit, ■ is a comparator, ■ is a gate circuit, Ia is a switch circuit,
Ib is a power supply section, (2) is a retardation circuit which forms the main part of the present invention) and C forms a resistance-effect frequency (rotation speed) detection circuit for setting a time constant. next. 5, Q is a control transistor, T1. , , (-), , are the resistors and capacitors forming the differential circuit, Dill,
4. This is an iode for Kl stop river. Thus, +i4 control M11 circuits are constructed. Next, the 1611 work will be explained with reference to FIGS. 2 and 3. In addition, the above circuit! 〜Vli
It is the same as the previously proposed circuit (Japanese Patent Application No. 56-140903), and its operation is left to the user (when the engine speed does not reach the set range (Fig. 3 N, below), the pulsar coil 20
In the positive period (No. 21'\Ia-■), No. 48 of
The output VIt pressure of the circuit ■, that is, the voltage of the capacitor 24 (note)) is set in advance by the output voltage R11 of the circuit ■, that is, the voltage of the capacitor 46.
Since it is set to be higher than the point (1) l of the ratio i1i+, the transistor 51 of the circuit (2) is reverse biased and is in an off state. Therefore, pulsa coil 2
When a negative signal (Fig. 2 a-■) is generated at o, in synchronization with the rising edge of the signal, the transistor 26 of circuit
Then, the capacitor 24 is discharged through the transistor 26, and the voltage decreases by about 11 degrees. Therefore, at the time when the above negative signal arrives, the transistor 5 becomes; jI-3
171, the transistors 61 and 62 of the gate circuit V are turned on, and a gate current flows through the path from the capacitor 41 to the transistor 62 to the gate of the thyristor 13, turning the thyristor 13 on. Therefore, the comparison circuit (■) sends an output (Fig. 2 f-■) to the gate in synchronization with the rise of the negative 1 signal set at a predetermined angle of the pulsar coil, resulting in the minimum ignition timing at a constant angle set by the negative pulse. (−
0°), the capacitor 2 is exposed to i11. L fire θ Makes 4 flowers. (Fig. 3 (a)) Also, when the engine speed is within the set range (N, -N, in Fig. 3), the voltage from condenser to J-24 decreases as the engine speed increases by -L,
In comparison circuit ■, point (g)) 1a, pressure is point (1)
) The timing when the current becomes below the ratio is earlier, and the transistor 51
conduction time becomes earlier. That is, in the above operation (when the copulsar coil 20 generates a negative signal), the transistor 51 conducts at υ1 (angle), but when the setting circuit exceeds Nl, the thyristor 13 is ignited in proportion to the increase in engine speed. The timing is earlier, and the ignition timing is earlier. jZuro. (3rd
(Fig.Q)) Furthermore, when the rotational speed N exceeds the set range, the capacitor 24 becomes even higher in the discharge circuit forming force through the transistor 26, so that the voltage rises in the upper series through the resistor 25. 26 becomes even more gentle, and the pressure (point 0C) of the condenser →J24 is always lower than the pressure (point (r)l) of the condenser 46.
一方、:Jンデンサイ6の?1を圧はパルサコイル20
に正の信号が発生してトランジスタ71がオン1−る毎
に発生するため、比較回路IVにおいては、」−記正の
信号の立上りに同期した時期即ち一定角度の116.大
点火時期(i=、 )において→ノ・イリスク13が導
通し、火花を生じせしめる。On the other hand: J'ndensai 6's? 1 is the pressure of pulsar coil 20
Since a positive signal is generated every time the transistor 71 is turned on, the comparator IV generates a positive signal every time the transistor 71 is turned on. At the large ignition timing (i=, ), the →no-irrisk 13 becomes conductive and generates a spark.
本発明はパル→J−コイルの予め設定された最少角度の
点lノ< [1;1.′期(=1季。)を始動時等更に
遅角せしめ、その点火時期を上死点近傍もしくは上死点
を越したマイナス角度での点火を可能にし、これにより
始動時のケッチン現像を解消するよう1こしたものであ
る。本発明はパルサコイルの負パルスの立下り時期に同
期してゲート信号を送出する機能を設は従来の立上りに
同期する信号に対し、パルス申分の遅れを利用した点火
角度411号を間ることを特徴とするものである。以下
回路■について説明する。先ず第3図中N、〜N 、
l を始動回転数とする。回路■のコンデン1J41
はパルサコイル2oの正パルス(第2図a)により導通
ずるトランジスタ72.71を介してこの期間充電され
、トランジスタ62のシ!j通により放1「1回路が形
成される迄その軍、荷を保持する。従って従来回路では
設定範囲以下の回転数の時(第3図N。以下)(J負パ
ルスの立−)−りで1ランジスタ51が唐通し、これに
よりトランジスタ62が導通ずるためコンデンサ41(
J第2図1)中点線で示す時間電荷を保持する。The present invention is characterized in that the predetermined minimum angle point of the pulse→J-coil l<[1;1. ' period (=1 season) is further retarded at the time of starting, etc., making it possible to ignite the ignition timing near top dead center or at a minus angle beyond top dead center, thereby eliminating the problem of sagging during starting. It is made by 1 strain. The present invention has a function of sending out a gate signal in synchronization with the falling timing of the negative pulse of the pulsar coil.In contrast to the conventional signal synchronized with the rising edge, the ignition angle 411 can be changed using the delay of the pulse. It is characterized by: Circuit (2) will be explained below. First, in Figure 3, N, ~N,
Let l be the starting rotation speed. Circuit ■ Condenser 1J41
is charged during this period through the transistors 72 and 71 which are made conductive by the positive pulse of the pulser coil 2o (FIG. 2a), and the transistor 62 is charged by the positive pulse (FIG. 2a). The load is held until one circuit is formed. Therefore, in the conventional circuit, when the rotation speed is below the set range (N in Figure 3) (lower than J negative pulse) - As a result, one transistor 51 is turned on, and as a result, the transistor 62 becomes conductive, so the capacitor 41 (
J Figure 2 1) Holds the charge for the time indicated by the dotted line.
一方抵抗R及びコンデンサCの時定数は予め正パルスの
立上りから負パルスの立上る迄の時間(:+’< 2図
b −t b )より短く設定されている。On the other hand, the time constants of the resistor R and the capacitor C are set in advance to be shorter than the time from the rise of the positive pulse to the rise of the negative pulse (:+'<b-tb in Fig. 2).
このためコンデンサCの電圧はコンデンサ41を電源き
して上列し、負イバ号パルスが立上る以前に定′rπ、
圧ダイオードZ J)のツーナ電圧Vzに達しく第21
・klc)制御用トランジスタ。1を2鍔通させる。こ
のため負パルスの立」−り時にトランジスタ51を介し
てトランジスタ61のベースに印加される点火信号は制
御用トランジスタQ、1に吸い込まれ該l・ランジスク
ロ11才依然不導通状態を維持する。従ってコンデンサ
41の1(1荷はザイリスタ13に与えられず第2図す
に示すように時間tb後も維持される。そしてパルサ2
0の9信号がlL%1lilj t a 71、立下り
これが1、i: くなる々トランジスタ26がオフし、
コンデンサ24の111圧が上列する。(第2図d)こ
の′i15、川はコンデンサc1により微分されて制御
;lll用トランジスタQtに与えられ(第2図e)N
亥トランジスタQ、を介してトランジスタQ、を瞬間的
1こオフにする。このためトランジスタ。。Therefore, the voltage of the capacitor C increases by turning on the capacitor 41, and becomes constant 'rπ before the negative signal pulse rises.
The 21st voltage that reaches the tuner voltage Vz of the piezoelectric diode ZJ)
・klc) Control transistor. Pass 1 through 2 tsuba. Therefore, the ignition signal applied to the base of the transistor 61 through the transistor 51 at the rising edge of the negative pulse is absorbed into the control transistor Q1 and remains non-conductive. Therefore, the 1 (1) load of the capacitor 41 is not applied to the Zyristor 13 and is maintained even after time tb as shown in FIG.
9 signal of 0 is 1L%1lilj t a 71, falling, this is 1, i: More and more the transistor 26 turns off,
The 111 voltage of the capacitor 24 is in the upper row. (Fig. 2 d) This 'i15, river is differentiated and controlled by the capacitor c1; it is given to the transistor Qt for Ill (Fig. 2 e) N
Transistor Q is momentarily turned off via transistor Q. For this reason transistors. .
により吸い込まれていた点火信号はトランジスタ61に
?lf、れ、その結果トランジスタ62を介してコニせ
チン甘イ1が放電し、ザイリスク131こゲート信号が
4衣られる。つまり第3図において、従来例では回転数
N、迄は常に点火角度0、で点火信号が与えられた(点
線a、)が本発明では始動時回転数(N e〜N1′)
の間負信号のパルス中(fa)だけ遅角して点火角度、
換言すれば第3図中線(d′)に示す如くより上死点(
θ°)に近い角度又は(d)に示す如く一ヒ死点を越し
た角度(−e)で点火信号が与えられる(第2図f)。Is the ignition signal absorbed by transistor 61? As a result, the electric current 1 is discharged through the transistor 62, and the gate signal 131 is output. In other words, in Fig. 3, in the conventional example, the ignition signal was given at the rotation speed N and the ignition angle was always 0 (dotted line a), but in the present invention, the ignition signal was given at the rotation speed at the time of starting (N e to N1').
The ignition angle is retarded by (fa) during the negative signal pulse,
In other words, as shown in the middle line (d') in Figure 3, the position is closer to the top dead center (
The ignition signal is applied at an angle close to θ°) or at an angle (-e) beyond the dead center as shown in (d) (FIG. 2f).
次にエンジン回転数が上列し、結果的1こ抵抗Rコンデ
ンサCの時定数が点Eのパルス[1j(t b ) J
ニリ長くなるとコンデンサCの電(V z )以下にな
る。(第2図C)このため制御用トランジスタQ 、は
常にオフであり点火信号を吸い込まず負信号の立上り時
分セミゲート(て
信号が送出される。(第2図f)つまり回転数NI′〜
N1の間は従来通り負信号の立上りで設定された点火信
号角度で点火する。以上要する1こ本発明はパルサコイ
ルの負信号の立上り時及び立下り時にゲート信号を送出
し、これにより従来負侶−号の立」−り時を基iv+、
!:L、たj((角点火特性に更に変化を持たせるよう
にしたものである。Next, the engine speed increases, and as a result, the time constant of one resistor R capacitor C becomes the pulse at point E [1j(t b ) J
If it becomes longer, the voltage of capacitor C (V z ) becomes lower. (Fig. 2 C) Therefore, the control transistor Q is always off and does not absorb the ignition signal, and a signal is sent out at the rising edge of the negative signal (Fig. 2 f), that is, the rotation speed NI'~
During N1, ignition is performed at the set ignition signal angle at the rising edge of the negative signal as before. 1) The present invention sends a gate signal at the rise and fall of the negative signal of the pulsar coil, thereby changing the conventional negative signal from the rise to iv+,
! :L, taj((This is one in which the angular ignition characteristics are further varied.
以上の実施例では本発明を既提案の回路に適用した例に
ついて説4明したがこの他負イ3号のみを用いた点火i
k!: li’7. lこ適用てきることは明白である
。In the above embodiment, an example in which the present invention is applied to an already proposed circuit has been described.
k! : li'7. It is clear that this can be applied.
以−1−の説明から明らかなように本発明によれば特に
エンジンのイjS速回転域で安定した点火特性がイl)
られるので実用上の効果(−I極めて太きい。As is clear from the explanation given below, according to the present invention, stable ignition characteristics are achieved especially in the engine speed rotation range.
The practical effect (-I is extremely large).
第1図、第2図及び第3図は本発明の一実施例回路図、
その活部動作波形図及び’F’、j tl l:)lで
ある。図1ζおいてI lj主回路、n If鋸θ・イ
状波発生回路、■は衝1jll波発生回路5■は11:
神器、■はゲート回路、■は遅角回路である。1, 2 and 3 are circuit diagrams of an embodiment of the present invention,
The active part operation waveform diagram and 'F', j tl l:)l. In FIG. 1ζ, I lj main circuit, n If sawtooth θ/A wave generation circuit, ■ is opposite 1 jll wave generation circuit 5 ■ is 11:
The sacred treasure, ■ is the gate circuit, and ■ is the delay circuit.
Claims (1)
ンデンサの充ttt 電荷をサイリスタを介して点火コ
イルに放電せしめる主回路とパルスコイルの信号を利用
して前記サイリスタのゲートをオンにする制御回路を備
えたコンデンサ充放電式点火装置において、該制御回路
はパルサコイルの狛パルスの立上り時に同期してゲート
信号を送出する回路と立下り時に同期してゲート信号を
送出する回路を有することを特徴とするコンデンサ充放
電式点火装置。The main circuit charges a capacitor with the voltage of the ignition 11C coil and discharges the charged charge of the capacitor to the ignition coil via the thyristor, and the control circuit turns on the gate of the thyristor using a signal from the pulse coil. A capacitor charging/discharging type ignition device characterized in that the control circuit has a circuit that sends out a gate signal in synchronization with the rising edge of the pulse of the pulser coil, and a circuit that sends out a gate signal in synchronization with the falling edge of the pulse of the pulser coil. Rechargeable and dischargeable ignition device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13301182A JPH0236790B2 (en) | 1982-07-30 | 1982-07-30 | KONDENSAJUHODENSHI KITENKASOCHI |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13301182A JPH0236790B2 (en) | 1982-07-30 | 1982-07-30 | KONDENSAJUHODENSHI KITENKASOCHI |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5923067A true JPS5923067A (en) | 1984-02-06 |
JPH0236790B2 JPH0236790B2 (en) | 1990-08-20 |
Family
ID=15094698
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13301182A Expired - Lifetime JPH0236790B2 (en) | 1982-07-30 | 1982-07-30 | KONDENSAJUHODENSHI KITENKASOCHI |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0236790B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6169478U (en) * | 1984-10-12 | 1986-05-12 | ||
JPH05111578A (en) * | 1991-08-01 | 1993-05-07 | Sega Sa | Switching and control system having four video game boards |
JPH0739649A (en) * | 1993-08-02 | 1995-02-10 | S N K:Kk | Game device for storing degree of difficulty |
JP2012007578A (en) * | 2010-06-28 | 2012-01-12 | Ikeda Denso Co Ltd | Capacitor charging/discharging type engine ignition device |
-
1982
- 1982-07-30 JP JP13301182A patent/JPH0236790B2/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6169478U (en) * | 1984-10-12 | 1986-05-12 | ||
JPH05111578A (en) * | 1991-08-01 | 1993-05-07 | Sega Sa | Switching and control system having four video game boards |
JPH0739649A (en) * | 1993-08-02 | 1995-02-10 | S N K:Kk | Game device for storing degree of difficulty |
JP2012007578A (en) * | 2010-06-28 | 2012-01-12 | Ikeda Denso Co Ltd | Capacitor charging/discharging type engine ignition device |
Also Published As
Publication number | Publication date |
---|---|
JPH0236790B2 (en) | 1990-08-20 |
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