JPH0434321B2 - - Google Patents
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- Publication number
- JPH0434321B2 JPH0434321B2 JP62176474A JP17647487A JPH0434321B2 JP H0434321 B2 JPH0434321 B2 JP H0434321B2 JP 62176474 A JP62176474 A JP 62176474A JP 17647487 A JP17647487 A JP 17647487A JP H0434321 B2 JPH0434321 B2 JP H0434321B2
- Authority
- JP
- Japan
- Prior art keywords
- electric field
- polarized waves
- phase
- phase shifter
- circularly polarized
- 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.)
- Expired - Lifetime
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- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、水平偏波、垂直偏波、右旋円偏波
及び左旋円偏波をそれぞれ弁別できる偏波弁別器
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a polarization discriminator that can discriminate horizontally polarized waves, vertically polarized waves, right-handed circularly polarized waves, and left-handed circularly polarized waves.
従来、水平偏波及び垂直偏波をそれぞれ弁別す
る偏波弁別器には、例えば第６図に示すように水
平導波管２ａとこれに垂直に取付けられた垂直導
波管２ｂを有する直交偏波分離分波器２があつ
た。また、右旋円偏波及び左旋円偏波を弁別する
偏波弁別器には、第７図に示すように直交偏波分
離分波器２の前段に円−直線偏波変換器４を設
け、右旋円偏波及び左旋円偏波をそれぞれ水平及
び垂直偏波に変換して、直交偏波分離分波器２に
供給するようにしたものがあつた。
Conventionally, polarization discriminators for discriminating between horizontally polarized waves and vertically polarized waves include, for example, an orthogonal polarization discriminator having a horizontal waveguide 2a and a vertical waveguide 2b installed perpendicularly thereto, as shown in FIG. The wave separator/brancher 2 was installed. In addition, as shown in FIG. 7, the polarization discriminator for discriminating right-handed circularly polarized waves and left-handed circularly polarized waves includes a circular-to-linear polarized wave converter 4 at the front stage of the orthogonal polarized wave separator/brancher 2. , there was one in which right-handed circularly polarized waves and left-handed circularly polarized waves were converted into horizontal and vertically polarized waves, respectively, and then supplied to the orthogonal polarization splitter 2 .
〔発明が解決しようとする問題点〕
第６図の直交偏波分離分波器２は、水平導波管
２ａに垂直に垂直導波管２ｂを取付けた構成であ
るので、その形状が大きいという問題点があり、
第７図の円偏波を弁別するものでは、もともと形
状が大きい直交偏波分離分波器２に円−直線偏波
変換器４を取付けているので、益々形状が大きく
なるという問題点があつた。さらに、第６図の直
交偏波分離分波器２では水平及び垂直偏波しか弁
別できず、第７図のものでは右旋円偏波及び左旋
円偏波しか弁別できないという問題点があつた。[Problems to be Solved by the Invention] The orthogonal polarization splitter 2 shown in FIG. 6 has a configuration in which a vertical waveguide 2b is attached perpendicularly to a horizontal waveguide 2a, so its shape is large. There are problems,
In the device for discriminating circularly polarized waves shown in Fig. 7, the circular-linear polarization converter 4 is attached to the orthogonal polarization splitter 2, which is originally large in shape, so there is a problem that the shape becomes increasingly large. Ta. Furthermore, the orthogonal polarization splitter 2 shown in Fig. 6 can only discriminate between horizontal and vertical polarized waves, and the one shown in Fig. 7 has the problem that it can only discriminate between right-handed and left-handed circularly polarized waves. .
この発明は、小型でかつ水平偏波、垂直偏波、
右旋円偏波及び左旋円偏波を１台で弁別できる偏
波弁別器を提供することを目的とし、そのため導
波管内にその管軸を通る水平面または垂直面に対
してそれぞれ45°の角度をなし、かつ互いになす
角度が90°となるように同一面内に２つのプロー
ブを設け、これら２つのプローブの一方に0°，
90°，180°，270°に位相を変化させる移相器を設
け、この移相器と他方のプローブとを分配器また
は合成器に接続してなるものである。
This invention is compact, horizontally polarized, vertically polarized,
The purpose is to provide a polarization discriminator that can discriminate right-handed circularly polarized waves and left-handed circularly polarized waves with a single unit, and for this purpose, the waveguide is provided with an angle of 45° with respect to the horizontal or vertical plane passing through the tube axis. Two probes are installed in the same plane so that the angle between them is 90°, and one of these two probes has a 0°,
A phase shifter that changes the phase to 90°, 180°, and 270° is provided, and this phase shifter and the other probe are connected to a distributor or combiner.
水平面または垂直面に対して45°をなし、かつ
互いに90°の角度をなすように２つのプローブを
同一面内に設けているので、移相器の位相を0°と
し、分配器より両者に等振幅、同位相の電力を供
給すると、２つのプローブによつてそれぞれ導波
管内に励振される２つの電界は水平面または垂直
面に対して45°の角度をなし、互いに90°の角度を
なすように発生する。これら両電界の合成電界
は、水平面または垂直面に常に平行となる。すな
わち、水平または垂直偏波となる。また、移相器
を調整して、２つのプローブによつて励磁される
２つの電界の位相差を180°とすると、両者の合成
電界は、垂直面または水平面に平行となる。すな
わち、垂直または水平偏波となる。さらに、移相
器を調整して、両電界の移相器側の位相を90°進
めると、両者の合成電界は、左回転する。すなわ
ち、左旋円偏波となる。また、移相器を調整し
て、両電界の移相器側の位相を270°進めると、両
者の合成電界は右回転する。すなわち右旋円偏波
となる。上記の説明は、送信の場合であるが、無
論、合成器を用い、移相器を0°，90°，180°，270°
に調整することによつて、水平偏波、垂直偏波、
左旋円偏波及び右旋円偏波をそれぞれ受信できる
ことは明らかである。
Since the two probes are installed in the same plane, making an angle of 45° to the horizontal or vertical plane and 90° to each other, the phase of the phase shifter is set to 0°, and the phase of the phase shifter is set to 0°. When power is supplied with equal amplitude and phase, the two electric fields excited in the waveguide by the two probes make an angle of 45° to the horizontal or vertical plane and an angle of 90° to each other. It occurs like this. The combined electric field of both electric fields is always parallel to the horizontal or vertical plane. That is, it becomes horizontally or vertically polarized. Furthermore, if the phase shifter is adjusted so that the phase difference between the two electric fields excited by the two probes is 180°, the combined electric field of both becomes parallel to the vertical or horizontal plane. That is, it becomes vertically or horizontally polarized. Furthermore, by adjusting the phase shifter and advancing the phase of both electric fields on the phase shifter side by 90 degrees, the combined electric field of both rotates to the left. In other words, it becomes a left-handed circularly polarized wave. Also, by adjusting the phase shifter and advancing the phase of both electric fields on the phase shifter side by 270 degrees, the combined electric field of both will rotate clockwise. In other words, it becomes a right-handed circularly polarized wave. The above explanation is for transmission, but of course a synthesizer is used and the phase shifters are set at 0°, 90°, 180°, and 270°.
By adjusting to horizontal polarization, vertical polarization,
It is clear that left-handed circularly polarized waves and right-handed circularly polarized waves can be received respectively.
以上のように、この発明によれば、１台の偏波
弁別器で水平偏波、垂直偏波、左旋円偏波、右旋
円偏波のうち１波を移相器での位相調整に応じて
弁別して、送信したり受信できる。しかも、その
構造は、導波管内に２つのプローブを同一面内に
設け、これらプローブの一方に移相器を接続し、
分配器または合成器を用いたものであるので、小
型であり、まして円偏波を弁別するに際して円−
直線偏波変換器を取付ける必要がなく、従来の円
偏波弁別器と比較して格段に小型化されたものと
なる。
As described above, according to the present invention, one polarization discriminator can adjust the phase of one wave among horizontal polarization, vertical polarization, left-handed circular polarization, and right-handed circular polarization using a phase shifter. It can be sent or received depending on the type of information. Moreover, the structure is such that two probes are provided in the same plane within the waveguide, and a phase shifter is connected to one of these probes.
Since it uses a splitter or combiner, it is compact and, moreover, it is difficult to distinguish between circularly polarized waves.
There is no need to install a linear polarization converter, and the device is much smaller than conventional circular polarization discriminators.
第１図乃至第４図に第１の実施例を示す。第１
図及び第２図において、１０は円形導波管で、そ
の一端部は第２図に示すように端壁１０ａによつ
て閉塞されている。この端壁１０ａから前方へ
λ／４（λは送受信しようとする電波の波長）の位
置に２つのプローブ１２ａ，１２ｂが設けられて
いる。なお、端壁１０ａからλ／４の位置に設けら
れているのは、端壁１０ａが導波管１０の終端を
短絡している状態にあり、短絡された終端から
λ／４の位置では、電界が最大となるからである。
A first embodiment is shown in FIGS. 1 to 4. 1st
In the figure and FIG. 2, 10 is a circular waveguide, one end of which is closed by an end wall 10a as shown in FIG. Two probes 12a and 12b are provided at a position of λ/4 (λ is the wavelength of radio waves to be transmitted and received) forward from this end wall 10a. Note that the end wall 10a is provided at a position λ/4 from the end wall 10a because the end wall 10a short-circuits the terminal end of the waveguide 10, and at a position λ/4 from the short-circuited terminal end, This is because the electric field becomes maximum.
２つのプローブ１２ａ，１２ｂは、第１図に示
すように導波管１０の管軸１３を通る水平面１５
に対して下方にそれぞれ45°の角度をなし、互い
には90°の角度をなすように同一面にある導波管
１０の内周面に設けられている。 The two probes 12a and 12b are connected to a horizontal plane 15 passing through the tube axis 13 of the waveguide 10, as shown in FIG.
They are provided on the inner circumferential surface of the waveguide 10 on the same plane so as to form an angle of 45 degrees downward with respect to each other and an angle of 90 degrees with each other.
プローブ１２ａは、同軸ケーブルまたはマイク
ロストリツプライン等の給電線１６ａを介して移
相器１８の一端に接続されている。この移相器１
８の他端は、給電線１６ｂを介して電力２分配器
２０の一方の分配端子に接続されている。また、
電力２分配器２０の他方の分配端子は、給電線１
６ｃを介して、プローブ１２ｂに接続されてい
る。また、電力２分配器２０の入力側は、給電線
１６ｄを介して送信機（図示せず）に接続されて
いる。無論、受信に用いる場合には、電力２分配
器２０に代えて合成器が用いられる。 The probe 12a is connected to one end of the phase shifter 18 via a power supply line 16a such as a coaxial cable or a microstrip line. This phase shifter 1
The other end of 8 is connected to one distribution terminal of a two-power distributor 20 via a power supply line 16b. Also,
The other distribution terminal of the power 2 divider 20 is connected to the power supply line 1
It is connected to the probe 12b via 6c. Further, the input side of the two-power divider 20 is connected to a transmitter (not shown) via a power feed line 16d. Of course, when used for reception, a combiner is used in place of the two-power divider 20.
次に第３図を参照しながら、この実施例の偏波
弁別器で、水平偏波、垂直偏波、左旋円偏波及び
右旋円偏波を弁別できる理由を説明する。送信機
より供給された電力を電力２分配器２０によつて
等振幅、同位相に２分配した後、プローブ１２
ａ，１２ｂに供給するが、この際に移相器１８を
調整して、プローブ１２ａ，１２ｂ間に供給され
る電力間に0°，90°，180°，270°の位相差をもたせ
る。このとき、プローブ１２ａ，１２ｂから導波
管１０内に励振される電界E〓a，E〓bは、第１図に
示すように大きさが等しく、互いに90°の角度を
なしている。 Next, with reference to FIG. 3, the reason why the polarization discriminator of this embodiment can discriminate between horizontally polarized waves, vertically polarized waves, left-handed circularly polarized waves, and right-handed circularly polarized waves will be explained. After the power supplied from the transmitter is divided into two parts with equal amplitude and the same phase by the power splitter 20, the probe 12
At this time, the phase shifter 18 is adjusted to provide phase differences of 0°, 90°, 180°, and 270° between the power supplied between the probes 12a and 12b. At this time, the electric fields E〓a, E〓b excited in the waveguide 10 from the probes 12a, 12b are equal in magnitude and form an angle of 90° with each other, as shown in FIG.
ここで、移相器１８を調整して、E〓a，E〓bの位
相差を０とすると、第３図ａに示すように時刻t1
では、E〓a，E〓bは共に０となり、合成電界も０と
なる。時刻t2ではE〓aは左下向き、E〓bは左上向き
となる。よつて時刻t2でのE〓a，E〓bの合成電界は
左向きとなる。時刻t3ではE〓a，E〓bは共に０とな
り、やはり合成電界は０となる。時刻t4ではE〓aは
右上向き、E〓bは右下向きとなる。よつて、合成
電界は右向きとなる。時刻t5では、E〓a，E〓b共に
０であり、合成電界は０となる。以下、この繰返
しとなり、合成電界は水平方向にしか生じず、水
平偏波を送信できる。 Here, if the phase shifter 18 is adjusted and the phase difference between E〓a and E〓b is set to 0, then at time t 1 as shown in Fig. 3a,
Then, both E〓a and E〓b become 0, and the combined electric field also becomes 0. At time t 2 , E〓a points toward the lower left, and E〓b points toward the upper left. Therefore, the combined electric field of E〓a and E〓b at time t2 points to the left. At time t3 , both E〓a and E〓b become 0, and the combined electric field also becomes 0. At time t 4 , E〓a points toward the upper right, and E〓b points toward the lower right. Therefore, the combined electric field points to the right. At time t5 , both E〓a and E〓b are 0, and the combined electric field becomes 0. Thereafter, this process is repeated, and the combined electric field is generated only in the horizontal direction, making it possible to transmit horizontally polarized waves.
E〓a，E〓bの位相差を180°とすると、第３図ｂに
示すように上記と同様に時刻t1，t3，t5では合成
電界は０であるが、時刻t2ではE〓aは右上向き、
E〓bは左上向きとなる。よつて、合成電界は上向
きとなる。また時刻t4ではE〓aは左下向き、E〓bは
右下向きとなる。よつて、合成電界は下向きとな
る。以上のように180°の位相差をE〓a，E〓b間にも
たせると、合成電界は垂直方向にしか生じず、垂
直偏波を送信できる。 Assuming that the phase difference between E〓a and E〓b is 180°, as shown in Figure 3b, the composite electric field is 0 at times t 1 , t 3 , and t 5 as above, but at time t 2 E〓a points upward to the right,
E〓b points upward to the left. Therefore, the combined electric field is directed upward. Furthermore, at time t4 , E〓a points downward to the left, and E〓b points downward to the right. Therefore, the combined electric field is directed downward. As described above, when a 180° phase difference is created between E〓a and E〓b, a composite electric field is generated only in the vertical direction, and vertically polarized waves can be transmitted.
移相器１８を調整してE〓bに対してE〓aの位相を
90°進めると、第３図ｃに示すように、時刻t1で
はE〓aは左下向き、E〓bは０である。よつて、合成
電界は左下向きとなる。また時刻t2ではE〓aは０
で、E〓bは左上向きとなる。よつて、合成電界は
左上向きとなる。時刻t3ではE〓aは右上向きで、
E〓bは０である。よつて、合成電界は右上向きで
ある。時刻t4ではE〓aは０で、E〓bは右下向きであ
る。よつて、合成電界は右下向きである。時刻t5
ではE〓aは左下向きで、E〓bは０である。よつて、
合成電界は左下向きである。以上のように、E〓b
に対しE〓aの位相を90°進めた場合、合成電界は左
下向き、左上向き、右上向き、右下向き、左下向
きと時計方向に回転する。すなわち、左旋円偏波
を送信できる。 Adjust the phase shifter 18 to change the phase of E〓a with respect to E〓b.
When advanced by 90°, as shown in FIG. 3c, at time t1 , E〓a points downward to the left and E〓b is 0. Therefore, the combined electric field points downward to the left. Also, at time t 2 , E〓a is 0
So, E〓b points upward to the left. Therefore, the combined electric field points upward to the left. At time t 3 , E〓a points upward to the right,
E〓b is 0. Therefore, the combined electric field points upward and to the right. At time t4 , E〓a is 0, and E〓b points downward and to the right. Therefore, the combined electric field is directed downward and to the right. time t 5
Then, E〓a points downward to the left, and E〓b is 0. Then,
The resultant electric field points downward and to the left. As above, E〓b
If the phase of E〓a is advanced by 90 degrees, the resultant electric field rotates clockwise: downward left, upward left, upward right, downward right, downward left. That is, left-handed circularly polarized waves can be transmitted.
E〓bに対してE〓aの位相を270°進めると、時刻t1
ではE〓aは右上向きであり、E〓bは０である。従つ
て、合成電界は右上向きである。時刻t2ではE〓aは
０であり、E〓bは左上向きである。よつて、合成
電界は左上向きである。時刻t3ではE〓aは左下向き
で、E〓bは０である。よつて、合成電界は左下向
きである。時刻t4ではE〓aは０で、E〓bは右下向き
である。よつて、合成電界は右下向きである。時
刻t5ではE〓aは右上向きで、E〓bは０である。よつ
て、合成電界は右上向きである。以上のように、
E〓bに対してE〓aの位相を270°進めた場合、合成電
界は、右上向き、左上向き、左下向き、右下向
き、右上向きと反時計方向に回転する。すなわ
ち、右旋円偏波を送信できる。 When the phase of E〓a is advanced by 270° with respect to E〓b, time t 1
Then, E〓a points upward to the right, and E〓b is 0. Therefore, the resultant electric field is directed upward and to the right. At time t2 , E〓a is 0, and E〓b is directed upward to the left. Therefore, the combined electric field is directed upward and to the left. At time t3 , E〓a points downward to the left, and E〓b is 0. Therefore, the combined electric field points downward and to the left. At time t4 , E〓a is 0, and E〓b points downward and to the right. Therefore, the combined electric field is directed downward and to the right. At time t5 , E〓a points upward to the right, and E〓b is 0. Therefore, the combined electric field points upward and to the right. As mentioned above,
When the phase of E〓a is advanced by 270° with respect to E〓b, the resultant electric field rotates counterclockwise: upward to the right, upward to the left, downward to the left, downward to the right, and upward to the right. In other words, right-handed circularly polarized waves can be transmitted.
このように、移相器１８によつて位相を調整す
ることによつて、水平偏波、垂直偏波、左旋円偏
波、右旋円偏波を送信できる。無論、電力２分配
器を合成器として、移相器の位相を0°，90°，
180°，270°に調整すれば、上記の各偏波を受信で
きる。 In this way, by adjusting the phase with the phase shifter 18, horizontally polarized waves, vertically polarized waves, left-handed circularly polarized waves, and right-handed circularly polarized waves can be transmitted. Of course, using the power 2 splitter as a combiner, the phase of the phase shifter can be set to 0°, 90°,
By adjusting to 180° and 270°, each of the above polarized waves can be received.
第４図は、この実施例の弁別器に、ホーン２２
及びコンバータ２４を取付けた状態を示す。同図
において、２６は、移相器１８の位相調整用ビ
ス、２８は、コンバータ２４の出力端子である。 FIG. 4 shows a horn 22 in the discriminator of this embodiment.
and shows the state in which the converter 24 is attached. In the figure, 26 is a phase adjustment screw of the phase shifter 18, and 28 is an output terminal of the converter 24.
第５図に第２の実施例を示す。この実施例は、
導波管を矩形導波管３０とした以外、第１の実施
例と同様に構成されており、また同様に動作す
る。 FIG. 5 shows a second embodiment. This example is
This embodiment has the same structure as the first embodiment except that the waveguide is a rectangular waveguide 30, and operates in the same manner.
上記の両実施例では、プローブ１２ａ，１２ｂ
は水平面に対して下方にそれぞれ45°の角度をな
し、互いになす角度が90°となるように配置した
が、対称に上方に配置してもよいし、また垂直面
に対して右または左にそれぞれ45°の角度をなし、
互いになす角度が90°となるように配置してもよ
い。 In both of the above embodiments, the probes 12a, 12b
are arranged at an angle of 45° downward with respect to the horizontal plane, and at an angle of 90° with respect to each other, but they may also be arranged symmetrically upward, or to the right or left of the vertical plane. each forming an angle of 45°,
They may be arranged so that the angle between them is 90°.
第１図はこの発明による偏波弁別器の第１の実
施例の縦断正面図、第２図は同第１の実施例の縦
断側面図、第３図は同第１の実施例の動作説明
図、第４図は同第１の実施例にホーン部とコンバ
ータを取付けた状態を示す斜視図、第５図は同第
２の実施例の縦断正面図、第６図は従来の水平偏
波及び垂直偏波弁別器の斜視図、第７図は従来の
右旋円偏波及び左旋円偏波弁別器の組立図であ
る。
１０，３０……導波管、１２ａ，１２ｂ……プ
ローブ、１８……移相器。
FIG. 1 is a longitudinal sectional front view of a first embodiment of a polarization discriminator according to the present invention, FIG. 2 is a longitudinal sectional side view of the first embodiment, and FIG. 3 is an explanation of the operation of the first embodiment. Figure 4 is a perspective view showing the first embodiment with the horn section and converter attached, Figure 5 is a longitudinal sectional front view of the second embodiment, and Figure 6 is a conventional horizontally polarized wave. and a perspective view of a vertically polarized wave discriminator, and FIG. 7 is an assembled view of a conventional right-handed circularly polarized wave and left-handed circularly polarized wave discriminator. 10, 30... Waveguide, 12a, 12b... Probe, 18... Phase shifter.
Claims (1)
面に対してそれぞれ45°の角度をなし互いになす
角度が90°となるように同一面内に２つのプロー
ブを設け、これらプローブの一方に0°，90°，
180°，270°に位相を変化させる移相器を接続し、
この移相器と他方のプローブとを分配器または合
成器に接続してなる偏波弁別器。1 Two probes are installed in the same plane so that they are each at an angle of 45° to the horizontal or vertical plane passing through the waveguide axis, and the angle between them is 90°, and one of these probes is set at 0. °，90°，
Connect a phase shifter that changes the phase to 180° and 270°,
A polarization discriminator is formed by connecting this phase shifter and the other probe to a distributor or combiner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17647487A JPS6419801A (en) | 1987-07-15 | 1987-07-15 | Polarized wave discriminator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17647487A JPS6419801A (en) | 1987-07-15 | 1987-07-15 | Polarized wave discriminator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6419801A JPS6419801A (en) | 1989-01-23 |
| JPH0434321B2 true JPH0434321B2 (en) | 1992-06-05 |
Family
ID=16014304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17647487A Granted JPS6419801A (en) | 1987-07-15 | 1987-07-15 | Polarized wave discriminator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6419801A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06164204A (en) * | 1992-11-24 | 1994-06-10 | Matsushita Electric Ind Co Ltd | Satellite receiving converter |
| JPH06204905A (en) * | 1992-12-14 | 1994-07-22 | Nec Corp | Microwave receiver |
| JPH0730301A (en) * | 1993-07-08 | 1995-01-31 | Nec Corp | Satellite broadcast receiver |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5837129U (en) * | 1981-09-07 | 1983-03-10 | 日本通信工業株式会社 | electrode terminal |
| JPS6038881A (en) * | 1983-08-11 | 1985-02-28 | Agency Of Ind Science & Technol | Semiconductor nonvolatile memory |
| JPS61102802A (en) * | 1984-10-24 | 1986-05-21 | Nec Corp | Polarized multiplexer |
| JPS62127102U (en) * | 1986-02-04 | 1987-08-12 |
-
1987
- 1987-07-15 JP JP17647487A patent/JPS6419801A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6419801A (en) | 1989-01-23 |
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