JPS58157370A - Power source circuit - Google Patents
Power source circuitInfo
- Publication number
- JPS58157370A JPS58157370A JP4111282A JP4111282A JPS58157370A JP S58157370 A JPS58157370 A JP S58157370A JP 4111282 A JP4111282 A JP 4111282A JP 4111282 A JP4111282 A JP 4111282A JP S58157370 A JPS58157370 A JP S58157370A
- Authority
- JP
- Japan
- Prior art keywords
- output
- converter
- battery
- connect
- impedance
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/538—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration
Abstract
Description
【発明の詳細な説明】
本発明は車両搭載用の電子音響機器婢に適用して好適な
Ｗ源回路、特に電池を用いた電源回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a W source circuit suitable for application to electronic audio equipment mounted on a vehicle, and particularly to a power source circuit using a battery.
車両搭載用の電子音響機器（カーステレオ）の再生音の
音質は一般にあまり良く々い。そこで、この点を改善す
る手段を、パワーアンプに限って以下に検討してみる。The sound quality of the sound reproduced by electronic audio equipment (car stereo) installed in vehicles is generally not very good. Therefore, means for improving this point will be considered below, limited to power amplifiers.
音電の音声信号の平均出力（）９ワー）に対する尖頭−
尖頭値は、ソースがラジオ受信機、カセットテープレコ
ーダの場合、４０〜５０ｄＢ以上あるので、ノぞワーア
ンプとしては５０Ｗ〜１００Ｗ程度のものが望ましい。Peak for the average output of sound and electric audio signals (9 watts) -
Since the peak value is 40 to 50 dB or more when the source is a radio receiver or cassette tape recorder, it is desirable that the output power amplifier be about 50 to 100 W.
位相及び波形歪（高調波歪、混変調歪）は、直線性との
関連が大きいが、ダイナミックな形の歪は動作安定度の
影響が太きい。パワーアンプとして、２を源直流アンプ
を用いると、かがる歪の問題は大幅に改善される。Phase and waveform distortion (harmonic distortion, cross-modulation distortion) are closely related to linearity, but dynamic distortion is greatly influenced by operational stability. If a source DC amplifier is used as the power amplifier, the problem of distortion can be greatly improved.
ノぞワーアンプのヒステリシス歪は、電解コンデンサ・
トランス弊の非直線部品の使用を排除することによっ
て除去できル（ＯＣＬ 、ＯＴＬ 、 ＩＴＬ 、 Ｉ
ＣＬアンプ等）０
次に、従来の１電源方式の／ｅクワ−ンプの効率につい
て検討する。第１図に８ＥＰＰアンプを示す。The hysteresis distortion of the nose amplifier is caused by electrolytic capacitors and
transformers can be eliminated by eliminating the use of non-linear components (OCL, OTL, ITL, I
CL amplifier, etc.) 0 Next, the efficiency of the conventional single-power supply system /e qua-amp will be considered. Figure 1 shows an 8EPP amplifier.
Ｅは電池（例えば１２ｖ）であって、その正極が端子ｔ
１に、負極が端子ｔ２に接続されている。Ｑｌ。E is a battery (for example, 12V), the positive electrode of which is connected to the terminal t.
1, the negative electrode is connected to the terminal t2. Ql.
Ｑ２は夫々ＮＰＮ形及びＰＮＰ形の出方トランジスタ、
ｅは信号源、ｃｏけ出力コンデンサ、ＳＰはスピーカで
ある。Q2 is an NPN type and a PNP type output transistor, respectively;
e is a signal source, a coke output capacitor, and SP a speaker.
かかる８ＥＰＰアンプの無歪出力ｐｏは、電源電圧をＶ
ＣスピーカＳＰの抵抗をＲＬ、、Ｉ源電圧の利・次式の
如く表わされる。The undistorted output po of such an 8EPP amplifier has a power supply voltage of V
The resistance of the C speaker SP is expressed as RL, and the profit of the I source voltage is expressed as follows.
（１）式に於いて、η＝１、ＶＣ＝１２（Ｖ）、）ＬＬ
＝４（Ω）とすれは、Ｐｏは４．５ ＶＶとなる。In equation (1), η=1, VC=12(V), )LL
= 4 (Ω), Po becomes 4.5 VV.
第２図にＨＴＬアンプを示す。電池Ｅの正、負嘗極に接
続された端子ｔ１ 、 ｔ２間に、ＮＰＮ形トランジス
タＱｌｌ ＋ Ｑｚｔ及びＰＮＰ形トランジスタＱ１２
１Ｑ２２が積重なるように接続され、トランジスタＱ１
１゜Ｑ １２の接続中点とトランジスタＱ２１ ｒ Ｑ
２２の接続中漬との間にスピーカＳＰが接続される。ｅ
、ｅ’は互いに逆相の信号源である。Figure 2 shows an HTL amplifier. An NPN transistor Qll + Qzt and a PNP transistor Q12 are connected between the terminals t1 and t2 connected to the positive and negative terminals of the battery E.
1Q22 are connected in a stacked manner, and the transistor Q1
1° Q12 connection midpoint and transistor Q21 r Q
A speaker SP is connected between the connecting terminal 22 and the connecting terminal 22. e
, e' are signal sources having mutually opposite phases.
かかるＢＴＬアンプの無歪出力Ｐｏ′は、η′を電源電
圧の利用率とすれば次式のように表わされる。The undistorted output Po' of such a BTL amplifier is expressed as follows, where η' is the utilization rate of the power supply voltage.
（２）式に於いて、η’＝ｌ 、 ＶＣ＝１２ （Ｖ）
、 ＲＬ＝４ （Ω）と □すれば、ｐ／は１８
．０ Ｗとなる。In formula (2), η'=l, VC=12 (V)
, RL=4 (Ω) □, then p/ is 18
．． It becomes 0W.
いずれの場合も、無歪出力はあまり大きくない。In either case, the undistorted output is not very large.
かかる点に鑑み、本発明は負荷としてのパワーアンプの
出力を増大させることができ、且つパワーアンプの音質
を同上させることのできる小形、低摩、低雑音の電源回
路を提案せんとするものである。In view of this, the present invention proposes a compact, low-power, low-noise power supply circuit that can increase the output of a power amplifier as a load and improve the sound quality of the power amplifier. be.
以下に、第３図を参照して、本発明をその一実施例につ
き詳細に説明する。先ず、電源回路（１）について説明
する。Ｅは電池（１次又扛２次電池）で、その第１のｔ
極（本例では負極であるが、正極でもよい）が端子ｔ２
を介して基準電位点、即ち接地に接続される。電池Ｅの
第２の１１＃（従って本例では正極であるが、第１の電
極が正極の場合は負極と力る）をヒユーズ（電源回路及
びその偵荷回路（アンプ）を過犬食荷電流から保ｓ−す
るためのもの）Ｆ８を介してＩＪＣ−１）Ｃコンバータ
（３）の入力端子に接続する。Hereinafter, one embodiment of the present invention will be described in detail with reference to FIG. First, the power supply circuit (1) will be explained. E is a battery (primary or secondary battery) whose first t
The pole (in this example, it is a negative pole, but it may be a positive pole) is the terminal t2
is connected to a reference potential point, i.e., ground. Connect the second 11# of battery E (therefore, it is the positive electrode in this example, but if the first electrode is the positive electrode, it is the negative electrode) to the fuse (the power supply circuit and its rectifier circuit (amplifier)). Connected to the input terminal of the IJC-1)C converter (3) via F8 (for protection against current).
ＤＣ−ＤＣコンバータ（３）は入力直流電圧の極性を反
転するコンバータで、ＰＷＭ方式のスイッチングレギュ
レータが用いられる。これは絶縁形、非絶縁形のいずれ
でも良い。その−具体例を第４図にっ゛いて後述する。The DC-DC converter (3) is a converter that inverts the polarity of the input DC voltage, and uses a PWM switching regulator. This may be either an insulated type or a non-insulated type. A specific example thereof will be described later with reference to FIG.
又、ＩＪｃ−ＩＪｃコンバータ（３）には負帰還回路Ｎ
Ｆが設けられる。ｊｉ！［１ち、比較回路（４）を設け
、ここで端子ｔｌの直流電圧とコンバータ（３）の出力
直流電圧とをその絶対値に於いてレベル比較し、両誉圧
の絶対値が等しくなるようにコンバータ（３）を制御す
る。In addition, the IJc-IJc converter (3) has a negative feedback circuit N.
F is provided. ji! [1st, a comparator circuit (4) is provided, which compares the DC voltage of the terminal tl and the output DC voltage of the converter (3) in terms of their absolute values, so that the absolute values of both honor pressures become equal. The converter (3) is controlled accordingly.
あるいは、端子ｔ１の直流電圧とコンバータ（３）の出
力直流電圧との和（抵抗加算により得る）が接地電位と
一致するように、コンバータ（４）を制御するようにし
ても良い。Alternatively, the converter (4) may be controlled so that the sum (obtained by resistance addition) of the DC voltage at the terminal t1 and the output DC voltage of the converter (3) matches the ground potential.
更に、コンバータ（３１の出力インピーダンスと等しい
インピーダンスを有するインピーダンス回路（５）を設
け、端子ｔ１をヒユーズＦＳを介し、更にこのインピー
ダンス回路（５）を介して第１の出力端子Ｔ１に接続す
る。又、コンバータ（３）の出力端子を第２の出力端子
Ｔ２に接続する。端子ｔ２を共通端子Ｔｏに接続する。Further, an impedance circuit (5) having an impedance equal to the output impedance of the converter (31) is provided, and the terminal t1 is connected to the first output terminal T1 via the fuse FS and further via this impedance circuit (5). , the output terminal of the converter (3) is connected to the second output terminal T2.The terminal t2 is connected to the common terminal To.
更に、コンノ々−タ（３）及びインピーダンス回路（５
）の各出力端子を夫々容量の等しい大容量コンデンサｃ
１．ｃ２を通じて接地する。Furthermore, a converter (3) and an impedance circuit (5)
) are connected to each output terminal by a large-capacity capacitor c with the same capacity.
1. Ground through c2.
かくして、ｍｌ及び第２の出力端子Ｔｌ、Ｔ２には常に
絶対値が等しくその極性を異にする正、狛の直流電圧が
得られる。In this way, positive and polar direct current voltages having the same absolute value and different polarities are always obtained at ml and the second output terminals Tl and T2.
次にこの電源回路（２）に接続される。Ｒワーアンプの
一例（ＳＥＰＰアンプ）（２）について説明する。Next, it is connected to this power supply circuit (2). An example of the R power amplifier (SEPP amplifier) (2) will be explained.
ＮＰＮ形のトランジスタＱ１のコレクタが第１の出力端
子Ｔ１に接続され、ＰＮＰ形のトランジスタＱ２のコレ
クタが第２の出力端子Ｔ２に接続され、トランジスタＱ
１１Ｑ２の各エミッタが互いに接続され、その各ベース
と接地との間に信号源ｅが接続される。そして、トラン
ジスタＱ１．Ｑ２の各エミッタの接続中点と共通端子Ｔ
ｏとの間にスピーカＳＰのゼイスコイルを接続する。The collector of the NPN transistor Q1 is connected to the first output terminal T1, the collector of the PNP transistor Q2 is connected to the second output terminal T2, and the transistor Q
Each emitter of 11Q2 is connected to each other, and a signal source e is connected between each of its bases and ground. And transistor Q1. The connection midpoint of each emitter of Q2 and the common terminal T
Connect the Zeiss coil of the speaker SP between the
次に、第４図について、上述のＤＣ−１）Ｃコンノ々−
タ（３）の−具体例について説明する。例えばＮＰＮ形
のスイッチング用トランジスタＱａが設けられる〇トラ
ンジスタ〜ＱａのコレクタがヒユーズＦＳを介して端子
ｔ１に接続され、そのエミッタが整流用ダイオードＤａ
のカソードに接続され、そのアノードが第２の出力端子
Ｔ２に接続される。トランジスターのコレクタを大容量
コンデンサＣａを通じて接地する。ダイオードａａのア
ノードを他の大容量コンデンサＣｂを通じて接地する。Next, regarding FIG. 4, the above-mentioned DC-1) C connectors
A specific example of data (3) will be explained. For example, an NPN type switching transistor Qa is provided. The collector of the transistor Qa is connected to the terminal t1 via the fuse FS, and its emitter is connected to the rectifier diode Da.
, and its anode is connected to the second output terminal T2. The collector of the transistor is grounded through a large capacitor Ca. The anode of diode aa is grounded through another large capacitor Cb.
トランジスタＱａのエミッタをコイルしａを通じて接地
する。The emitter of transistor Qa is coiled and grounded through a.
（６）は゛トランジスターａをオンオフ制御するＰＷＭ
発振器で、その出力端子がトランジスタＱａのベースに
接続される。このＰＷＭ発奈器（６）は比較器（４）の
出力によって匍ｊ御され、第１及び第２の出力端子Ｔ１
．Ｔ２より絶対値が等しく極性の異なる一対の直流電圧
が得られるように、ＰＷＭ発振器（６）の出力パルスの
デユーティが制御される。(6) is "PWM that controls on/off of transistor a"
An oscillator whose output terminal is connected to the base of transistor Qa. This PWM generator (6) is controlled by the output of the comparator (4), and is connected to the first and second output terminals T1.
．． The duty of the output pulse of the PWM oscillator (6) is controlled so that a pair of DC voltages having the same absolute value and different polarities are obtained from T2.
このコンバータ（３）では、トランジスタＱａがオフの
サイクルで、コイルＬａに蓄積されたエネルギーがダイ
オードＤａを違じて出力端子Ｔ２ｆＩＩｌに送出される
。又、トランジスタＱａが長時間オン状態を保持するよ
うなことがあっても、ダイオードＤａの存在により、第
２の出力端子Ｔ２から第１の出力端子Ｔｌの直流電圧と
同じ極性の直流電圧が得られることは無い。従って、第
１及び第２の出力端子Ｔｌ。In this converter (3), in the cycle in which the transistor Qa is off, the energy stored in the coil La is sent to the output terminal T2fIIl via the diode Da. Furthermore, even if the transistor Qa remains on for a long time, the existence of the diode Da ensures that a DC voltage of the same polarity as the DC voltage of the first output terminal Tl can be obtained from the second output terminal T2. There's no chance of it happening. Therefore, the first and second output terminals Tl.
Ｔ２に接続される負荷回路がＩＣであっても、このよう
な異常時にＩＣが損傷する虞は無い。Even if the load circuit connected to T2 is an IC, there is no risk that the IC will be damaged in such an abnormality.
第３図のパワーアンプ（５ＥＰＰアンプ） （２１の無
歪出力Ｐ♂は次式のように表わされる。The undistorted output P♂ of the power amplifier (5EPP amplifier) (21) in FIG. 3 is expressed as follows.
（３）式で、η＝１ 、ＶＣ＝１２（Ｖ）、 九＝４（
Ω）とおくと、出力Ｐｏ１は１８０Ｗとなり、第１図の
場合の出力ＰＯ（４，５Ｗ ）の４倍と彦る。In formula (3), η=1, VC=12(V), 9=4(
Ω), the output Po1 becomes 180 W, which is four times the output PO (4.5 W) in the case of FIG.
第３図の、Ｊワーアンゾ（２）をＢＴＬ、アンプに代え
た場合の無歪出力Ｐｏ′ＩＩは次式のように表わされる
。When the JWANZO (2) in FIG. 3 is replaced with a BTL and an amplifier, the undistorted output Po'II is expressed by the following equation.
（４）式で、η′＝１．ＶＣ＝１２（Ｖ） 、 Ｒｔ、
＝４（Ω）とおくと、出力Ｐ♂は７２Ｗとなり、第２図
の場合の出力Ｐｏ′（１ｓＷ）の４倍となる。In equation (4), η'=1. VC=12(V), Rt,
=4 (Ω), the output P♂ becomes 72W, which is four times the output Po' (1 sW) in the case of FIG.
上述せる本発明によれば、負荷としての、ｅワーアンプ
の出力を増大させることができ、且つパワ・−アンプの
音質を向上させることのできる電源回路を得ることがで
きる。According to the present invention described above, it is possible to obtain a power supply circuit that can increase the output of an e-power amplifier as a load and can improve the sound quality of the power amplifier.
又、本発明によれば、絶対値が常に等しい互いに極性を
異にする一対の血流電圧を出力すること −のできる電
源回路を得ることができる。Further, according to the present invention, it is possible to obtain a power supply circuit that can output a pair of blood flow voltages having always the same absolute value and having different polarities.
又、本発明によれば、ＤＣ−ＩＪｃコンバータが】個で
すむので、小形、低摩でしかも低雑音の電源回路を得る
ことができる。Further, according to the present invention, since only one DC-IJc converter is required, a small, low-power, low-noise power supply circuit can be obtained.
因みに、シリーズレギュレータを用いる場合、次のよう
な問題がある。正、負の一対のシリーズレギュレータを
必要とする。重力損失が太きい。Incidentally, when using a series regulator, there are the following problems. Requires a pair of positive and negative series regulators. Gravity loss is large.
一方のシリーズレギュレータの出力電圧で他方のシリー
ズレギュレータの出力電圧を制御する際、比較トランジ
スタの温度特性により両出力電圧の絶対値の追従性が悪
くなる。各シリーズレギュレータに対する、極性を異に
する各入力電圧は、交流電圧をトランスに供給し、その
トランスの２次コイルの中点を接地し、その２次コイル
の両端にブリッジ形整流回路を接続することによって得
々ければならず、電池を用いることができない。When the output voltage of one series regulator is used to control the output voltage of the other series regulator, the followability of the absolute values of both output voltages deteriorates due to the temperature characteristics of the comparison transistor. Each input voltage of different polarity for each series regulator supplies an alternating current voltage to a transformer, the middle point of the secondary coil of the transformer is grounded, and a bridge type rectifier circuit is connected to both ends of the secondary coil. In some cases, batteries cannot be used.
第１図及び第２図は従来のノξワーアンプを示す回路図
、第３図は本発明の一実施例を示す回路図、特開昭５ｏ
−ｔ５７３７ｏ＜４）
第１閃
第２図1 and 2 are circuit diagrams showing a conventional ξ power amplifier, and FIG. 3 is a circuit diagram showing an embodiment of the present invention.
-t5737o<4) 1st Flash Figure 2
Claims (1)
２の１極をＤＣ−ＤＣコンバータの入力端子に接続して
成シ、上記電池の第２の電極及び上記１）Ｃ−ＩＪｃフ
ン・々−夕の出力端子よシ、絶対値が等しく互いに極性
を異にする一対の直流電圧を出力するようにしたことを
特徴とする電源回路。 ２、電池の第１の電極を基準電位点に接続し、その第２
の電極を１）Ｃ−ＤＣコンバータの入力端子に接続し、
該１）Ｃ−Ｉ）Ｃコンノーノに負帰還回路を設けて成シ
、上記電池の第２のＷ極及び上記ＤＣ−ＤＣコンバータ
の出力端子よシ絶対値が等しく互いに極性を異にする一
対の直流電圧を出力するようにしたことを特徴とする電
源回路。 ３、ｗ池の第１の電極を基抱嘗位点に接続し、その第２
の！極を１）Ｃ−１）Ｃコンノ々−夕の入力端子に接続
し、上記電池の第２の１極を上記ＤＣ−ＩＪｃコンノ々
−夕の出力インピーダンスと等しいインピーダンスを有
するインピーダンス回路を通じて第１の出力端子に接続
し、上記Ｌ）Ｃ−１）Ｃコン／” −タ及ヒ上記インピ
ーダンス回路の各出力端子及び上記基準電位点間に夫々
互いに容量の等しいコンデンサを接続し、上記ＩＪｃ
−ＤＣコンノ々−夕の出力端子を第２の出力端子に接続
して成り、上記第１及び第２の出力端子より絶対価が等
しく互いに極性を異にする一対の直流電圧を出力するよ
うにしたことを特徴とする電源回路０[Claims] The first IL pole of the 1° battery is connected to a reference potential point, and the second pole of the battery is connected to the input terminal of a DC-DC converter. A power supply circuit characterized in that the electrodes and the output terminals of the above-mentioned 1) C-IJc terminals output a pair of DC voltages having the same absolute value and different polarities. 2. Connect the first electrode of the battery to the reference potential point, and connect the second electrode of the battery to the reference potential point.
1) Connect the electrode to the input terminal of the C-DC converter,
1) A negative feedback circuit is provided in the C-I) C connector, and a pair of polarities having equal absolute values and different polarities are connected to the second W pole of the battery and the output terminal of the DC-DC converter. A power supply circuit characterized in that it outputs a direct current voltage. 3. Connect the first electrode of the w pond to the base position, and the second
of! 1) connect the second one pole of the battery to the input terminal of the DC-IJc connector and connect the second one pole of the battery to the first through an impedance circuit having an impedance equal to the output impedance of the DC-IJc connector. Connect capacitors of equal capacitance between each output terminal of the impedance circuit and the reference potential point, and
- The output terminal of a DC converter is connected to a second output terminal, and the first and second output terminals output a pair of DC voltages having equal absolute values and different polarities. Power supply circuit 0 characterized by
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4111282A JPS58157370A (en) | 1982-03-15 | 1982-03-15 | Power source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4111282A JPS58157370A (en) | 1982-03-15 | 1982-03-15 | Power source circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58157370A true JPS58157370A (en) | 1983-09-19 |
Family
ID=12599383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4111282A Pending JPS58157370A (en) | 1982-03-15 | 1982-03-15 | Power source circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58157370A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6187736U (en) * | 1984-11-15 | 1986-06-09 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4946122A (en) * | 1972-09-11 | 1974-05-02 | ||
| JPS5443174A (en) * | 1977-09-13 | 1979-04-05 | Asahi Glass Co Ltd | Preparation of lithium hydroxide |
-
1982
- 1982-03-15 JP JP4111282A patent/JPS58157370A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4946122A (en) * | 1972-09-11 | 1974-05-02 | ||
| JPS5443174A (en) * | 1977-09-13 | 1979-04-05 | Asahi Glass Co Ltd | Preparation of lithium hydroxide |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6187736U (en) * | 1984-11-15 | 1986-06-09 | ||
| JPH0539943Y2 (en) * | 1984-11-15 | 1993-10-12 |
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