JP2955238B2 - Point control type signal sorting device - Google Patents
Point control type signal sorting deviceInfo
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- JP2955238B2 JP2955238B2 JP25402696A JP25402696A JP2955238B2 JP 2955238 B2 JP2955238 B2 JP 2955238B2 JP 25402696 A JP25402696 A JP 25402696A JP 25402696 A JP25402696 A JP 25402696A JP 2955238 B2 JP2955238 B2 JP 2955238B2
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- ground
- signal
- frequency
- synchronous detection
- unit
- Prior art date
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Description
【０００１】[0001]
【発明の属する技術分野】この発明は、列車の停止制御
や踏切制御等の各種制御に使用される地上子を使用した
点制御式信号選別装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a point control type signal selection device using a grounding element used for various controls such as train stop control and railroad crossing control.
【０００２】[0002]
【従来の技術】自動列車停止装置としては、図２に示す
ように、車上装置として車上子３のコイルを帰還回路と
した増幅器２２による常時発振周波数ｆ1の発振回路部
２１を設け、地上装置には一定周波数ｆ2の共振回路か
らなる地上子１を設け、走行している列車の車上子３が
地上子１の上を通るときに、発振回路部２１の常時発振
周波数ｆ1が地上子に設定された共振回路の周波数ｆ2に
変周して、列車に停止指令を出し、一定時間以内に確認
扱いをしないときには、自動的に非常ブレ−キにより列
車を停止させるＡＴＳ−Ｓ形が広く実用化されている。2. Description of the Related Art As automatic train stop, as shown in FIG. 2, is provided an oscillation circuit portion 21 always oscillating frequency f 1 by the amplifier 22 to the coil of the board coil 3 and a feedback circuit as on-board equipment, The ground device is provided with a ground element 1 composed of a resonance circuit having a constant frequency f 2. When the vehicle element 3 of the running train passes over the ground element 1, the constant oscillation frequency f 1 of the oscillation circuit section 21 is set. There was Edit the frequency f 2 of the resonant circuit is set to the ground element, issues a stop command to the train, when no confirmation handled within a predetermined time, automatically very blur - causing key by stopping the train ATS- The S type is widely used.
【０００３】[0003]
【発明が解決しようとする課題】上記自動列車停止装置
は車上装置の発振回路部が一般の増幅回路と車上子の２
つのコイルによる帰還回路との組合せであるため、広範
囲の異なる周波数の地上子に対応させることが困難であ
った。また、外部からのノイズにより妨害を受けやすい
という短所もあった。In the above automatic train stopping device, the oscillation circuit of the on-board device is composed of a general amplification circuit and an on-board device.
Since this is a combination with a feedback circuit using one coil, it has been difficult to cope with a wide range of ground elements having different frequencies. In addition, there is a disadvantage in that it is easily disturbed by external noise.
【０００４】この発明はかかる短所を解消するためにな
されたものであり、異なる周波数の地上子に簡単に対応
することができるとともに外部の電磁雑音に対しても影
響を受けずに安定した動作を行うことができる点制御式
信号選別装置を得ることを目的とするものである。The present invention has been made in order to solve the above-mentioned disadvantages, and can easily cope with a ground element having a different frequency and can operate stably without being affected by external electromagnetic noise. It is an object of the present invention to obtain a point-controlled signal sorting device that can be used.
【０００５】[0005]
【課題を解決するための手段】この発明に係る点制御式
信号選別装置は、地上装置と車上装置とを有し、地上装
置は複数の地上子を有し、各地上子は異なる周波数の共
振回路からなり、車上装置は車上子と発振回路部と電力
増幅器と同期検波回路部及び演算部とを有し、車上子は
１次側コイル及び２次側コイルを有し、発振回路部の出
力側を電力増幅器の入力側と同期検波回路部の参照信号
入力側に接続し、電力増幅器の出力側を車上子の１次側
コイルに接続し、車上子の２次側コイルを同期検波回路
部の信号入力側に接続し、同期検波回路部の検波出力側
を演算部の入力側に接続し、発振回路部は列車種別に応
じて異なる発振周波数の信号を出力し、同期検波回路部
は車上子が発振回路部から出力する発振周波数と同一の
共振周波数を持つ地上子と結合したときに、地上子から
車上子の２次側コイルへ送られる周波数の信号を発振回
路部から送られている参照信号で同期検波して検波信号
を出力し、演算部は入力した検波信号の振幅成分と位相
成分を演算して出力することを特徴とする。SUMMARY OF THE INVENTION A point control type signal sorting apparatus according to the present invention has a ground unit and an on-board unit, the ground unit has a plurality of ground units, and each ground unit has a different frequency. The on-board device has a resonance circuit. The on-vehicle device has an on-board element, an oscillation circuit section, a power amplifier, a synchronous detection circuit section and an operation section. The on-board element has a primary side coil and a secondary side coil, The output side of the circuit section is connected to the input side of the power amplifier and the reference signal input side of the synchronous detection circuit section, the output side of the power amplifier is connected to the primary coil of the vehicle upper arm, and the secondary side of the vehicle upper arm. The coil is connected to the signal input side of the synchronous detection circuit section, the detection output side of the synchronous detection circuit section is connected to the input side of the calculation section, and the oscillation circuit section outputs signals having different oscillation frequencies according to the train type, The synchronous detection circuit has the same resonance frequency as the oscillation frequency output from the oscillation circuit by the upper armature When combined with upper child, from the ground coil
Oscillates the frequency signal sent to the secondary coil of the vehicle
It is characterized in that synchronous detection is performed with a reference signal sent from a road section and a detection signal is output, and a calculation section calculates and outputs an amplitude component and a phase component of the input detection signal.
【０００６】[0006]
【発明の実施の形態】この発明の点制御式信号選別装置
は、地上装置として異なる周波数ｆ1，ｆ2，ｆ3，ｆ4の
共振回路からなる複数の地上子を有する。列車に搭載さ
れた車上装置は車上子と発振回路部と電力増幅器と同期
検波回路部及び演算部を有する。車上子は１次側コイル
及び２次側コイルを有し、列車が走行するにしたがって
地上子と電磁結合する。発振回路部は、例えば直接デジ
タル合成方式の波形発生回路からなり、クロック信号を
発生するクロック発生部と、クロック周期毎に列車の種
別を示す周波数デ−タｆdと自己の出力を加算する累積
加算器と、波形デ−タを記憶する波形メモリ及びＤ／Ａ
コンバ−タからなり、列車の種別に応じた発振周波数ｆ
1〜ｆ4の信号を出力する。DETAILED DESCRIPTION OF THE INVENTION The controlled signal sorting apparatus aspect of this invention includes a plurality of ground coil consisting of resonant circuits having different frequencies f 1, f 2, f 3 , f 4 as ground device. The on-board device mounted on the train has an on-board member, an oscillation circuit unit, a power amplifier, a synchronous detection circuit unit, and a calculation unit. The upper armature has a primary side coil and a secondary side coil, and is electromagnetically coupled with the ground arm as the train travels. The oscillating circuit section is, for example, a direct digital synthesizing waveform generating circuit. The oscillating circuit section includes a clock generating section for generating a clock signal, and cumulative addition for adding frequency data fd indicating a train type and a self-output for each clock cycle. , Waveform memory for storing waveform data, and D / A
Oscillation frequency f according to train type, consisting of converter
And it outputs a signal of 1 ~f 4.
【０００７】そして列車が走行しているときに、車上装
置の発振回路部は列車種別に応じて設定された異なる発
振周波数、例えば周波数ｆ1の信号を出力している。発
振回路部で出力している周波数ｆ1の信号は電力増幅器
で増幅され車上子の１次側コイルに入力するとともに同
期検波回路に参照信号として入力している。この状態で
列車が共振周波数ｆ1の地上子の位置に達すると、周波
数ｆ1の信号が送られている車上子は共振周波数ｆ1の地
上子と電磁結合して共振し、発生した周波数ｆ1の発振
出力を２次側コイルから各同期検波回路に信号入力とし
て送る。同期検波回路は送られた周波数ｆ1の信号を周
波数ｆ1の参照信号で同期検波して、検波出力信号を演
算部に出力する。演算部は入力した検波出力信号から振
幅成分と位相成分を演算して出力する。このように発振
回路部で出力している周波数ｆ1の信号を同期検波回路
部に参照信号として入力しているから、車上子が共振周
波数ｆ1の地上子と電磁結合したときだけ同期検波回路
部から検波出力信号を出力し、共振周波数ｆ1の地上子
の信号を確実に選別することができる。[0007] Then, when the train is traveling, the oscillator circuit portion of the onboard system is outputting set different oscillation frequencies according to train type, for example, a signal of a frequency f 1. Signal of a frequency f 1 that is output by the oscillation circuit unit is input as a reference signal to a synchronous detection circuit receives an input to the primary coil of the amplified cars upper child by the power amplifier. When the train in this state reaches the position of the ground coil of the resonance frequency f 1, board coil signal of frequency f 1 is transmitted resonates with ground coils electromagnetically coupled resonant frequencies f 1, generated frequency Send an oscillation output of f 1 as the signal input from the secondary side coil in each synchronous detection circuit. Synchronous detection circuit a signal of a frequency f 1 sent in synchronous detection by the reference signal of the frequency f 1, and outputs a detection output signal to the arithmetic unit. The calculation section calculates and outputs an amplitude component and a phase component from the input detection output signal. Since in this manner is input a signal of a frequency f 1 that is output by the oscillation circuit as a reference signal to a synchronous detection circuit section, only synchronous detection when the pickup coil is electromagnetically coupled to the ground coil of the resonance frequency f 1 it is possible to output a detection output signal from the circuit section, reliably selecting a signal of a ground unit of the resonance frequency f 1.
【０００８】[0008]
【実施例】図１はこの発明の一実施例の構成を示すブロ
ック図である。図に示すように、点制御式信号選別装置
は、地上装置として異なる周波数ｆ1，ｆ2，ｆ3，ｆ4の
共振回路からなる複数の地上子１ａ〜１ｄを有する。列
車に搭載された車上装置２は車上子３と発振回路部４と
電力増幅器５と同期検波回路部６と演算部７及び緩衝増
幅器８，９を有する。車上子３は１次側コイル及び２次
側コイルを有し、列車が走行するにしたがって地上子１
ａ〜１ｄと電磁結合する。発振回路部４は、例えば直接
デジタル合成方式の波形発生回路からなり、クロック信
号を発生するクロック発生部４１と、全加算器とデ−タ
・ラッチ回路からなり、クロック周期毎に列車の種別を
示す周波数デ−タｆdと自己の出力を加算する累積加算
器４２と、波形デ−タ例えば正弦波のデジタルデ−タを
記憶する波形メモリ４３及びＤ／Ａコンバ−タ４４から
なり、列車の種別に応じて発振周波数ｆ1〜ｆ4の信号を
出力する。同期検波回路６には地上子１ａ〜１ｄの共振
周波数ｆ1〜ｆ4に対応して周波数ｆ1の同期検波回路６
１ａと周波数ｆ2の同期検波回路６１ｂと周波数ｆ3の同
期検波回路６１ｃと周波数ｆ4の同期検波回路６１ｄを
有する。各同期検波回路６１ａ〜６１ｄは信号入力と参
照信号入力を乗算する乗算器６２と、参照信号入力を90
度シフトするシフタ６３と、信号入力と90度シフトした
参照信号入力を乗算する乗算器６４と、各乗算器６２，
６４の出力側に接続されたフィルタ６５，６６を有す
る。そして発振回路部４の出力側を電力増幅器５の入力
側に接続するとともに緩衝増幅器８を介して同期検波回
路部６の参照信号入力側に接続している。電力増幅器５
の出力側は車上子３の１次側コイルに接続し、車上子３
の２次側コイルをバッファアンプからなる緩衝増幅器９
を介して同期検波回路部６の信号入力側に接続し、同期
検波回路部６の検波出力側を演算部７の入力側に接続し
ている。FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. As shown, the point controlled signal sorting apparatus has a plurality of ground coils 1a~1d consisting resonant circuits having different frequencies f 1, f 2, f 3 , f 4 as ground device. The on-board device 2 mounted on the train has an on-board member 3, an oscillation circuit unit 4, a power amplifier 5, a synchronous detection circuit unit 6, an operation unit 7, and buffer amplifiers 8, 9. The upper armature 3 has a primary side coil and a secondary side coil.
a to 1d are electromagnetically coupled. The oscillating circuit section 4 comprises, for example, a waveform generating circuit of a direct digital synthesizing system, and comprises a clock generating section 41 for generating a clock signal, a full adder and a data latch circuit. A cumulative adder 42 for adding the frequency data fd shown and its own output, a waveform memory 43 for storing waveform data, for example, digital data of a sine wave, and a D / A converter 44 are provided. and it outputs a signal of the oscillation frequency f 1 ~f 4 depending on the type. The synchronous detection circuit 6 in response to the resonance frequency f 1 ~f 4 of ground coils 1a~1d synchronous detection circuit 6 of the frequency f 1
Having a synchronous detection circuit 61c and the synchronous detection circuit 61d of the frequency f 4 of the synchronous detection circuit 61b of 1a and the frequency f 2 and the frequency f 3. Each of the synchronous detection circuits 61a to 61d includes a multiplier 62 for multiplying a signal input and a reference signal input and a reference signal input
A shifter 63 that shifts the signal input by 90 degrees, a multiplier 64 that multiplies the signal input by the reference signal input that is shifted by 90 degrees,
It has filters 65 and 66 connected to the output side of 64. The output side of the oscillation circuit section 4 is connected to the input side of the power amplifier 5 and connected to the reference signal input side of the synchronous detection circuit section 6 via the buffer amplifier 8. Power amplifier 5
Output side is connected to the primary coil of the vehicle armature 3, and the vehicle armature 3
Amplifier 9 composed of a buffer amplifier using the secondary coil of
Is connected to the signal input side of the synchronous detection circuit unit 6 via the, and the detection output side of the synchronous detection circuit unit 6 is connected to the input side of the arithmetic unit 7.
【０００９】上記のように構成された車上装置２の発振
回路部４は列車種別に応じて設定された異なる発振周波
数、例えば周波数ｆ1の信号を出力している。発振回路
部４で出力している周波数ｆ1の信号は電力増幅器５で
増幅され車上子３の１次側コイルに入力するとともに、
緩衝増幅器８を介して同期検波回路６１ａ〜６１ｄに参
照信号として入力している。この状態で列車が共振周波
数ｆ1の地上子１ａの位置に達すると、周波数ｆ1の信号
が送られている車上子３は共振周波数ｆ1の地上子１ａ
と電磁結合して共振し、発生した周波数ｆ1の発振出力
を２次側コイルから緩衝増幅器９を介して各同期検波回
路６１ａ〜６１ｄに信号入力として送る。周波数ｆ1の
同期検波回路６１ａは送られた周波数ｆ1の信号を周波
数ｆ1の参照信号で同期検波して、検波出力信号Ｘ＝Ａc
osφとＹ＝Ａsinφを演算部７に出力する。演算部７は
入力した検波出力信号Ｘ，Ｙから振幅成分Ａと位相成分
φを演算して出力する。このようにして発振回路部４で
出力している周波数ｆ1の信号を出力しているときに、
周波数ｆ1の信号を同期検波回路部６に参照信号として
入力しているから、車上子３が共振周波数ｆ1の地上子
１ａと電磁結合したときだけ同期検波回路部６から検波
出力信号Ｘ，Ｙを出力し、地上子１ａの信号を選別する
ことができる。[0009] outputs different oscillation frequencies, for example, a signal of a frequency f 1 which is set in accordance with an oscillation circuit unit 4 of the constructed vehicle on the device 2 to train type as described above. The signal of the frequency f 1 output from the oscillation circuit unit 4 is amplified by the power amplifier 5 and input to the primary coil of the upper armature 3.
The signals are input to the synchronous detection circuits 61a to 61d via the buffer amplifier 8 as reference signals. When the train in this state reaches the position of the ground unit 1a of the resonance frequency f 1, board coil 3 the signal of the frequency f 1 is sent ground element 1a of the resonance frequency f 1
An electromagnetic coupling to resonate, sends the oscillation output of frequency f 1 generated as a signal input from the secondary coil via a buffer amplifier 9 to the respective synchronous detection circuits 61a-61d. Synchronous detection circuit 61a of the frequency f 1 is a signal of a frequency f 1 sent in synchronous detection by the reference signal of the frequency f 1, the detection output signal X = Ac
osφ and Y = Asinφ are output to the arithmetic unit 7. The arithmetic unit 7 calculates an amplitude component A and a phase component φ from the input detection output signals X and Y, and outputs the result. When this way and outputs a signal of a frequency f 1 that is output by the oscillation circuit unit 4,
Because if the input signal of the frequency f 1 as a reference signal to a synchronous detection circuit section 6, only the detection output signal from the synchronous detection circuit unit 6 X when the pickup coil 3 is electromagnetically coupled to the ground coil 1a of the resonance frequency f 1 , Y to output signals of the ground terminal 1a.
【００１０】また、発振回路部４は出力信号を列車種別
信号ｆdにより異なる発振周波数ｆ1〜ｆ4に切り替えら
れるから、異なる共振周波数ｆ1〜ｆ4の地上子１ａ〜１
ｄに対応することができるとともに、各地上子１ａ〜１
ｄの共振周波数ｆ1〜ｆ4が経年変化により変動しても、
その変動に簡単に対処することができる。Further, since the oscillation circuit section 4 can switch the output signal to different oscillation frequencies f 1 to f 4 according to the train type signal fd, the ground terminals 1 a to 1 having different resonance frequencies f 1 to f 4 can be switched.
d and each ground child 1a-1
Even if the resonance frequencies f 1 to f 4 of d fluctuate over time,
The fluctuation can be easily dealt with.
【００１１】なお、上記実施例は発振回路部４を直接デ
ジタル合成方式の波形発生回路で構成した場合について
説明したが、発振周波数が異なる複数の発振回路を使用
し、異なる複数の発振周波数を列車種別に関係なく同時
に出力するようにしても対応でき、上記実施例と同様な
作用を奏することができる。Although the above-described embodiment has been described with respect to the case where the oscillating circuit section 4 is constituted by a direct digital synthesizing type waveform generating circuit, a plurality of oscillating circuits having different oscillating frequencies are used and the plurality of different oscillating frequencies are controlled by the train. It is possible to cope with simultaneous output regardless of the type, and the same operation as the above embodiment can be achieved.
【００１２】[0012]
【発明の効果】この発明は以上説明したように、列車の
種別に応じた発振周波数の信号を発振回路部で発生して
車上子に出力するとともに同期検波回路部に参照信号と
して入力しているから、車上子が発振回路部で発生して
いる発振周波数と同じ共振周波数の地上子と電磁結合し
たときだけ同期検波回路部から検波出力信号を出力する
ようにしたから、発振回路部で発生している発振周波数
と同じ共振周波数の地上子の信号を外部の電磁雑音の影
響を受けずに確実に選別することができる。As described above, according to the present invention, a signal having an oscillating frequency corresponding to the type of a train is generated in the oscillating circuit portion and output to the upper armature and input to the synchronous detection circuit portion as a reference signal. Therefore, the detection output signal is output from the synchronous detection circuit only when the vehicle arm is electromagnetically coupled to the ground element having the same resonance frequency as the oscillation frequency generated in the oscillation circuit. It is possible to reliably select signals from the ground resonator having the same resonance frequency as the generated oscillation frequency without being affected by external electromagnetic noise.
【００１３】また、発振回路部は出力信号を列車種別信
号により異なる発振周波数に切り替えられるから、異な
る共振周波数の地上子に対応することができるととも
に、各地上子の共振周波数が経年変化により変動して
も、その変動に簡単に対処することができる。Further, since the oscillation circuit section can switch the output signal to a different oscillation frequency depending on the train type signal, it can cope with ground elements having different resonance frequencies, and the resonance frequency of each ground element fluctuates due to aging. However, it is possible to easily cope with the fluctuation.
【００１４】さらに、車上装置は常時発振信号を出力し
ているから、インパルスノイズ的な外部雑音に対しても
影響を受けず安定した動作を行うことができる。Further, since the on-board device always outputs an oscillation signal, it can perform a stable operation without being affected by external noise such as impulse noise.
【図１】この発明の実施例の構成を示すブロック図であ
る。FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.
【図２】従来例の構成を示すブロック図である。FIG. 2 is a block diagram showing a configuration of a conventional example.
１ 地上子 ２ 車上装置 ３ 車上子 ４ 発振回路部 ５ 電力増幅器 ６ 同期検波回路部 ７ 演算部 DESCRIPTION OF SYMBOLS 1 Ground element 2 On-board device 3 On-board element 4 Oscillation circuit part 5 Power amplifier 6 Synchronous detection circuit part 7 Operation part
Claims (1)
は複数の地上子を有し、各地上子は異なる周波数の共振
回路からなり、車上装置は車上子と発振回路部と電力増
幅器と同期検波回路部及び演算部とを有し、車上子は１
次側コイル及び２次側コイルを有し、発振回路部の出力
側を電力増幅器の入力側と同期検波回路部の参照信号入
力側に接続し、電力増幅器の出力側を車上子の１次側コ
イルに接続し、車上子の２次側コイルを同期検波回路部
の信号入力側に接続し、同期検波回路部の検波出力側を
演算部の入力側に接続し、発振回路部は列車種別に応じ
て異なる発振周波数の信号を出力し、同期検波回路部は
車上子が発振回路部から出力する発振周波数と同一の共
振周波数を持つ地上子と結合したときに、地上子から車
上子の２次側コイルへ送られる周波数の信号を発振回路
部から送られている参照信号で同期検波して検波信号を
出力し、演算部は入力した検波信号の振幅成分と位相成
分を演算して出力することを特徴とする点制御式信号選
別装置。1. A ground device has a ground device and a vehicle device, the ground device has a plurality of ground members, each ground member includes a resonance circuit having a different frequency, and the vehicle device has a vehicle member and an oscillation circuit section. , A power amplifier, a synchronous detection circuit section, and an arithmetic section.
An output side of the oscillation circuit section is connected to an input side of the power amplifier and a reference signal input side of the synchronous detection circuit section , and an output side of the power amplifier is connected to a primary of a vehicle body. Connected to the side coil, the secondary coil of the upper armature is connected to the signal input side of the synchronous detection circuit section, the detection output side of the synchronous detection circuit section is connected to the input side of the arithmetic section, and the oscillation circuit section is connected to the train. Outputs signals with different oscillation frequencies according to the type, and the synchronous detection circuit unit outputs the signal from the ground unit to the vehicle when the vehicle unit is coupled to the ground unit that has the same resonance frequency as the oscillation frequency output from the oscillation circuit unit.
Oscillator circuit that sends the frequency signal sent to the upper secondary coil
A point-controlled signal selection device , wherein a synchronous detection is performed with a reference signal sent from a unit to output a detection signal, and a calculation unit calculates and outputs an amplitude component and a phase component of the input detection signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25402696A JP2955238B2 (en) | 1996-09-05 | 1996-09-05 | Point control type signal sorting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25402696A JP2955238B2 (en) | 1996-09-05 | 1996-09-05 | Point control type signal sorting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1076947A JPH1076947A (en) | 1998-03-24 |
| JP2955238B2 true JP2955238B2 (en) | 1999-10-04 |
Family
ID=17259214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25402696A Expired - Lifetime JP2955238B2 (en) | 1996-09-05 | 1996-09-05 | Point control type signal sorting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2955238B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4627021B2 (en) * | 2005-08-10 | 2011-02-09 | 株式会社京三製作所 | Train speed limiter |
| JP4823127B2 (en) * | 2006-05-24 | 2011-11-24 | 三菱電機株式会社 | Ground information reader |
| JP5279682B2 (en) * | 2009-10-29 | 2013-09-04 | 株式会社京三製作所 | Train control device |
| CN108627736B (en) * | 2017-03-22 | 2020-08-04 | 株洲中车时代电气股份有限公司 | Software online diagnosis method for reverse connection of network voltage synchronous signals |
-
1996
- 1996-09-05 JP JP25402696A patent/JP2955238B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1076947A (en) | 1998-03-24 |
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