JPS58184514A - Flow rate signal generator - Google Patents
Flow rate signal generatorInfo
- Publication number
- JPS58184514A JPS58184514A JP6636582A JP6636582A JPS58184514A JP S58184514 A JPS58184514 A JP S58184514A JP 6636582 A JP6636582 A JP 6636582A JP 6636582 A JP6636582 A JP 6636582A JP S58184514 A JPS58184514 A JP S58184514A
- Authority
- JP
- Japan
- Prior art keywords
- pattern
- light
- positive
- fixed
- flow rate
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
- G01F3/02—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement
- G01F3/04—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls
- G01F3/06—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls comprising members rotating in a fluid-tight or substantially fluid-tight manner in a housing
- G01F3/10—Geared or lobed impeller meters
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Optical Transform (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は信号レベルが＾く、且つ分解能の高いηＬ！
１信号を簡易に得るようにした流量発信器に関する。[Detailed Description of the Invention] This invention provides ηL! with a low signal level and high resolution.
The present invention relates to a flow rate transmitter that can easily obtain one signal.
従来、この樵の流量発信器には第１図に示すものが知ら
れる。Conventionally, the one shown in FIG. 1 is known as a flow rate transmitter for woodcutter.
すなわち、流量計本体ｌ内に回転自在に配設した同転子
２．２の一方に磁石３を埋込むとか、光反射体又社透過
孔を設は流量計本体１のケーシングに設けた磁石感応ス
イッチたとえばリードスイッチとかホール素子ま＆Ｈ光
の送受信機構を対向させて回転子２の回転数を検知計数
している。このように流量信号はデジタル量として発信
されるので、最近のデジタル技術の進歩により、単に流
量の計量に止まらず、質量、熱量などを計量演算するこ
とが容易に行なうことができ、更に多数の流量計を用い
て、これらを時分割的に計量し、制御を行なうこと４１
！求されるようになった。この場合には演算精度を高め
るため短時間に多数の流量パルス信号が発信される。即
ちパルス分解能の高い流量発信器が要求される。しかし
、従来の磁気感応スイッチを用いた方式では素子が大き
く、分解能を高くできず、磁気吸引にもとず〈トルクが
発生するので流体エネルギーの小さい微小流量の計量に
おいては着るしい誤差を生じて精度を保持できないとい
う不都合があった。まえ光反射体又は透過孔を用いる方
式においては、磁気感応素子のような吸引トルクの発生
はないが、分解能を高くすると信号レベルが小さくな秒
信号雑音比の大きい信号が得られず、この点で制約され
るという問題点があった。In other words, a magnet 3 is embedded in one side of the trochanter 2.2 which is rotatably disposed within the flowmeter body 1, or a magnet 3 is embedded in the casing of the flowmeter body 1 with a light reflector or a transparent hole. The number of revolutions of the rotor 2 is detected and counted by arranging a sensitive switch such as a reed switch, a Hall element, and a light transmitting/receiving mechanism. Since the flow rate signal is transmitted as a digital quantity in this way, recent advances in digital technology have made it possible to not only measure the flow rate, but also to easily calculate mass, heat, etc. Using a flowmeter to measure and control these in a time-division manner41
! now in demand. In this case, a large number of flow rate pulse signals are transmitted in a short period of time to improve calculation accuracy. That is, a flow transmitter with high pulse resolution is required. However, in the conventional method using a magnetically sensitive switch, the element is large and the resolution cannot be high. There was a disadvantage that accuracy could not be maintained. In the method using a light reflector or a transmission hole, there is no attraction torque generated as in the case of a magnetically sensitive element, but if the resolution is increased, a signal with a small signal level and a high signal-to-noise ratio cannot be obtained, and this point is The problem was that it was restricted by
この発明は板上の点に着目して成されたもので回転子の
軸またはその軸を中心とする−１−内周上に陰陽模様で
連続した固定パタンまたは回転パタンを設け、該固定パ
タンまたは回転パタンに対し流量計本体内の離開した相
対向位置に陰陽模様（ロ）転バタンまたは固定パタンを
配設して光の照射または電荷を与えることにより光また
は静電容量の変化として回転子の回転量に比例した信号
レベルの大きい、そして高い分解能の計量信号を無負荷
で得られるようにした流量発信器を得ることをｕ的とす
る。This invention was made by focusing on points on a plate, and a continuous fixed pattern or rotating pattern is provided in a yin-yang pattern on the axis of the rotor or on the inner periphery of the rotor, and the fixed pattern is Alternatively, by arranging a Yin-Yang pattern (B) inversion button or a fixed pattern at opposite positions separated from each other in the flow meter body relative to the rotation pattern, irradiation with light or applying electric charge causes the rotor to change as light or capacitance changes. The objective is to obtain a flow rate transmitter that can obtain a high-resolution metering signal with a high signal level proportional to the amount of rotation without any load.
以下に、この発明の一実施例を第１図ないし第４図に示
す図面と共に説明する。An embodiment of the present invention will be described below with reference to the drawings shown in FIGS. 1 to 4.
なお、従来例と同一の構成は同一符号で表わし、その説
明は雀く。Note that the same configurations as those of the conventional example are denoted by the same reference numerals, and the description thereof will be omitted.
４は所望の回転子２を支持する非同転の固定軸５の自由
端に設は九固にパタンで、例えば第４図（ａ）に示すよ
うに中心よ抄一定角度で区画した多数の陰陽ＩＩ！に様
ａが形成されている。ところで、この固定パタン４の陰
陽模様ａは互いにＩＩり合う模様が、光の反射可能な陰
部６と光を遮蔽する非反射の陰部７とによって構成され
ている。８Ｆｉ該固定軸５の固定パタン４と相対向して
離開した位置すなわち回転子２の中心において固着し九
回転バタンで、例えば第４図（ｂ）に示すような前記固
定パタ／４の陰陽模様ａと実質的に同一の陰陽模様すが
形成されている。すなわち、咳陰陽模様すは、前記固定
パタン４の陰部６に対応する個処が、切欠された光の透
過可能な陰部９として形成され、陰部ｌＯは前記固定パ
タン４の陰部７と同一構成を備える。１１は光を送信照
射し反射光を受信して転送する光送受信部で、前記回転
パタン８と同一軸上で流量計本体１′１０ケーシングに
固着される。4 is a fixed shaft 5 that supports a desired rotor 2, and is provided at the free end of a non-synchronously rotating fixed shaft 5 in a regular pattern, for example, as shown in FIG. Yin Yang II! A pattern a is formed. By the way, the yin-yang pattern a of this fixed pattern 4 is composed of a shadow part 6 that can reflect light and a non-reflection shadow part 7 that blocks light, which overlap each other. 8Fi Fixes the fixed shaft 5 at a position facing away from the fixed pattern 4, that is, at the center of the rotor 2, with a nine-turn slam, for example, the yin-yang pattern of the fixed pattern/4 as shown in FIG. 4(b). A yin-yang pattern substantially the same as a is formed. That is, in the cough yin-yang pattern, the part corresponding to the private part 6 of the fixed pattern 4 is formed as a cut-out private part 9 through which light can pass, and the private part 10 has the same structure as the private part 7 of the fixed pattern 4. Be prepared. Reference numeral 11 denotes an optical transmitting/receiving section that transmits and irradiates light and receives and transmits reflected light, and is fixed to the casing of the flow meter main body 1'10 on the same axis as the rotation pattern 8.
なお、図において、符号１２は流体の流出入部を示す。In the figure, reference numeral 12 indicates a fluid inflow and outflow section.
板上の構成に基づいて、この実施例の作用を説明する。The operation of this embodiment will be explained based on the configuration on the board.
所望の被計測流体が流量計本体１内の流出入部１２を通
って流れると同転子２．２はａｔを計測しながら回転す
る。When the desired fluid to be measured flows through the inflow/outflow section 12 in the flow meter main body 1, the trochanter 2.2 rotates while measuring at.
また、光送受信部１１から流量計本体ｌの内部へ照射さ
れる光は１回転パタン８を通って固定軸５の固定パタン
４に進行し、こむで陰陽模様ａの陽ｓ６により反射され
、る。In addition, the light emitted from the optical transmitter/receiver 11 into the flowmeter main body l passes through the one-rotation pattern 8, advances to the fixed pattern 4 of the fixed shaft 5, is reflected by the positive s6 of the positive yang pattern a, and is .
回転パタン８の陰陽模様すは、（６）定パタン４の陰陽
模様ａと実質的に同一であるため、しかも陰部７，１０
と陰部６，９と同一大きさであるため両陽部６．９が一
致する大きさが、全域から零に至る間および零から全域
に至る間に亘って絶えず連続しているので反射量本同様
の変化の下に光送受信部１１に得られ、薮にき匂めて分
解能の高い流量信号を得ることができる。The yin-yang pattern of the rotating pattern 8 is substantially the same as the yin-yang pattern a of the regular pattern 4 (6).
Since the same size as the private parts 6 and 9, the matching size of both positive parts 6 and 9 is continuous from the whole area to zero and from zero to the whole area, so the reflection amount book A high-resolution flow rate signal can be obtained by the optical transmitting/receiving section 11 under similar changes and by monitoring the bushes.
つぎに第５図に示す実施例について述べる。Next, the embodiment shown in FIG. 5 will be described.
この実施例は、前Ｖ＊施例における固定軸５の端部に同
着した固定パタン４の陰陽模様ａと同一の陰陽模様ａを
有する回転パタン１３を１紀実施例の回転パタン７と同
−個処に固着し、該回転パタン１３と相対向する固定軸
５の軸心上で流量計本体１のケーシングに固定パタン１
４を固着する。In this embodiment, the rotating pattern 13 having the same yin-yang pattern a as the yin-yang pattern a of the fixed pattern 4 attached to the end of the fixed shaft 5 in the previous V* embodiment is the same as the rotating pattern 7 of the first embodiment. - A fixed pattern 1 is fixed to the casing of the flowmeter main body 1 on the axis of the fixed shaft 5 that faces the rotating pattern 13.
Fix 4.
この固定パタン１４は、前記実施例における回転パタン
８の陰陽模様すと同一模様を備えると共にさらに流量計
本体ｌのケーシングには光の送信。This fixed pattern 14 has the same pattern as the yin-yang pattern of the rotating pattern 8 in the embodiment described above, and furthermore, the casing of the flow meter body 1 transmits light.
受信を行う光送受信部１１を固着しである。The optical transmitting/receiving section 11 that performs reception is fixed.
ここで、回転バタンＩ３の陽部分を反射面とするが、光
の透過形としてもよい。ただし、後者の場合、対向する
軸端面は光の反射面とする。Here, the positive part of the rotary button I3 is used as a reflective surface, but it may also be a light-transmissive type. However, in the latter case, the opposing shaft end surfaces are light reflecting surfaces.
なお、前記実施例と同一または相当部分は同一符号で表
わし、その説明の詳細は省く。Note that the same or equivalent parts as in the above embodiment are denoted by the same reference numerals, and detailed explanation thereof will be omitted.
この実施例においても、被計銅流体が流れて同転子２を
回転させると回転バタン１３４回転し固定パタン１４と
の間で、両陽部６．９が一致する部分が全域から零に至
る間および零から全域に至る間に亘って絶えず連続して
変化するので反射光も一１様−の変化の下に光送受信部
１１に得られ、ここに分解能の高い流量信号を得られる
。In this embodiment as well, when the copper fluid to be measured flows and rotates the trochanter 2, the rotary button 134 rotates and between it and the fixed pattern 14, the area where the positive parts 6.9 coincide goes from the entire area to zero. Since the reflected light is constantly and continuously changing from zero to the entire range, the reflected light is also received by the optical transmitter/receiver 11 under uniform changes, and a high-resolution flow rate signal can be obtained here.
また、第６図に示す実施例は、固定軸５を中心として１
１ｉ１一円周上において回転子２の外周に環状の同転バ
タン１５を設け、かつ該回転パタン１５が同一形状の光
を反射できる陰部１６と光を吸収する陰部１７とが交互
に隣接した縞状の陰陽模様Ｃを備える構成を示し、さら
に該回転バタン１５の相対向して離開した流量計本体１
のケーシングに少くとも的記陰に模様Ｃと実質的に同一
の光を透過できる陰部１８のみを固着するか（図示せず
）あるいは、該陰部１８と前記回転パタン１５の陰ｓ１
．７と同一の光を吸収する陰部１９とを交互に隣り合わ
せて構成される縞状の陰陽模様ｄを備えた固定パタン２
０となし、該固定バタン１９に接して前記構成の光送受
信部１１を流量計本体１に固着するものである。Further, in the embodiment shown in FIG.
1i1 An annular co-rotating button 15 is provided on the outer periphery of the rotor 2 on one circumference, and the rotating pattern 15 has stripes in which dark parts 16 that can reflect light and dark parts 17 that absorb light are alternately adjacent to each other in the same shape. The flowmeter main body 1 is shown having a yin-yang pattern C in the form of
(not shown), or fix only the shade 18 that can transmit substantially the same light as the pattern C to the casing at least in the shade (not shown), or
．． A fixed pattern 2 having a striped yin-yang pattern d consisting of alternating adjacent parts 7 and private parts 19 that absorb the same light.
0, and the optical transmitting/receiving section 11 having the above structure is fixed to the flow meter main body 1 in contact with the fixing button 19.
この実施例においても、被計測流体が流れて回転子２が
同転すると陰陽模様Ｃを備えた縞状の回転パタン１５か
回転し、固定バーム２０との間で両１１１Ｉｓ１６．１
８が一致する部分が全域から零に至る間および零から全
域に至る間に亘って絶えず連続して変化するので光送受
信部１１によって照射される光の反射光も同様の変下の
下に該光送受信部１１に受光され、ここにきわめて分解
能の高い流量信号を得ることができる。In this embodiment as well, when the fluid to be measured flows and the rotor 2 rotates, the striped rotation pattern 15 with the yin-yang pattern C rotates, and between the fixed berm 20 and the two 111Is16.1
Since the portion where 8 coincides continuously changes from the entire area to zero and from zero to the entire area, the reflected light of the light emitted by the optical transmitter/receiver 11 also falls under the same change. The light is received by the optical transmitter/receiver 11, from which a flow rate signal with extremely high resolution can be obtained.
以上の実施例では、光送受信部１１の構成によって専ら
光の照射反射を用いた光学的手段による流量信号の取出
しとして構成したが、偏光子および検光子を用いた全く
同様の回転パタンと固定パタンとに基く偏光作用を利用
した流量信号の取出しも可能である。In the above embodiment, the configuration of the optical transmitter/receiver 11 is such that the flow rate signal is extracted by an optical means that exclusively uses irradiation and reflection of light. It is also possible to extract a flow rate signal using the polarization effect based on.
さらに、回転パタンと固定パタンとを静電気的な変化を
得るための構成配置として構成し、陰部と陰部との相対
関係を電気磁気的な量の大きさの変化として得ることに
より回転子２の回転量を分解能の高い電気信号として取
出すことができる。Furthermore, by configuring the rotating pattern and the fixed pattern as a configuration for obtaining electrostatic changes, and obtaining the relative relationship between the genitals as a change in the electromagnetic quantity, the rotation of the rotor 2 is achieved. The amount can be extracted as a high-resolution electrical signal.
以上述べたように、この発明によれば、陰部と陰部とで
交互に連続して構成される陰陽模様を回転パタンおよび
固定パタンとして流量計本体の回転部分および固定部分
に相対向して配置し光学的また祉電気的などの適宜な手
段により前記回転パタンと固定パタンとの陰陽両部が１
ピツチごと透過と遮蔽を繰り返すので、バタンの分割数
の大きさ如何にかかわらず一部レベルの信号が得られる
ためバタン分割数を高めることができ、信号°レベルが
高く、しかも分解能の高い流量発信器が得られる。しか
本、これらのバタンは小形軽量にでき、取付も簡単なの
で流量計の小流特性も数置され生鉢性も＾められるので
安価な流量針を提供できる効果がある。As described above, according to the present invention, the yin-yang pattern, which is made up of alternating and continuous private parts, is arranged as a rotating pattern and a fixed pattern to face the rotating part and the fixed part of the flow meter main body. Both the yin and yang parts of the rotating pattern and the fixed pattern are made into one by appropriate means such as optical or electrical.
Since transmission and shielding are repeated for each pitch, a partial level signal can be obtained regardless of the number of divisions of the batten, so the number of divisions of the baton can be increased, and the signal level is high and the flow rate is transmitted with high resolution. A vessel is obtained. However, these buttons can be made small and lightweight, and are easy to install, so the small flow characteristics of the flowmeter can be adjusted, and the potability can be improved, so they have the effect of providing an inexpensive flow rate needle.
【図面の簡単な説明】
第１図は従来例を示す流量発信器の断面説明図、第２図
ないし第４図はこの発明に係る流量発信器の一実施例を
示すもので、第２図は費部の一部切欠説明図、第３図Ｆ
ｉド１上費部の拡大断面図、第４図（ａ）は固定軸に固
着される固足パタ／の正面図、第４図（ｂｌは同転子に
固着される回転パタンの正面図、第５図は他の実施例を
示す装部の拡大断面図。
第６図はさらに他の実施例に用いられるバタンで、（ａ
）は同転バタンを、（ｂ）は固定パタンを、それぞれ示
す正面図である。
１・・・・・・・・・流量計本体
２・・・・・・・・・回転子
４．１４．２０・・・固定パタン
５・・・・・・・・・固定軸
６．９．１６．１８・・・陰部
７．１０．１７．１９・・・陰部
８．１３．１５・−・回転パタン
１１・・・・・・光送受信部
第５図
７
２ｎ６図[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a cross-sectional explanatory diagram of a conventional flow rate transmitter, and Figs. 2 to 4 illustrate an embodiment of the flow rate transmitter according to the present invention. Figure 3F is a partially cutaway explanatory diagram of the expense section.
Figure 4 (a) is a front view of the fixed foot pattern fixed to the fixed shaft; Figure 4 (bl is a front view of the rotating pattern fixed to the trochanter); , FIG. 5 is an enlarged cross-sectional view of the mounting part showing another embodiment. FIG.
) is a front view showing a rotating button, and FIG. 2(b) is a front view showing a fixed pattern, respectively. 1...Flowmeter body 2...Rotor 4.14.20...Fixed pattern 5...Fixed shaft 6.9 .16.18...Pubic area 7.10.17.19...Pubic area 8.13.15...Rotation pattern 11...Optical transmitter/receiver part Fig. 5 7 2n6
Claims (1)
で検知しかつ所望の信号として取出すようにした流１に
発信器において、回転子で示される回転部分および流量
計本体で示される非回転部分に、前記回転子の回転中心
ま丸線回転中心より離れた同−１爛上に陰陽模様を表示
した回転バタンおよび固定バタンを相対向して配設し、
両パタ／の陰陽模様の重合変化を光学的ないし電気的変
化の流量信号として取出すようにした流量発憤器。In flow 1, the transmitter detects the rotation of the rotor disposed within the flowmeter body using a desired detection means and extracts it as a desired signal, and the rotating part indicated by the rotor and the flowmeter body are detected. In the non-rotating part, a rotating button and a stationary button are arranged facing each other and displaying a yin-yang pattern on the rotor at a distance from the center of rotation of the rotor.
A flow rate generator that extracts the polymerization change of the yin and yang pattern of both patterns as an optical or electrical change flow rate signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6636582A JPS58184514A (en) | 1982-04-22 | 1982-04-22 | Flow rate signal generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6636582A JPS58184514A (en) | 1982-04-22 | 1982-04-22 | Flow rate signal generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58184514A true JPS58184514A (en) | 1983-10-28 |
| JPH0427488B2 JPH0427488B2 (en) | 1992-05-12 |
Family
ID=13313743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6636582A Granted JPS58184514A (en) | 1982-04-22 | 1982-04-22 | Flow rate signal generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58184514A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6286516U (en) * | 1985-11-20 | 1987-06-02 | ||
| US4815318A (en) * | 1985-04-03 | 1989-03-28 | Lopresti William J | Bearing-less positive displacement flow meter |
| US4911010A (en) * | 1988-08-12 | 1990-03-27 | Flowdata, Inc. | Fluid flowmeter |
| US5325715A (en) * | 1989-08-09 | 1994-07-05 | Flowdata, Inc. | Fluid flowmeter |
| US5627313A (en) * | 1993-11-15 | 1997-05-06 | Gomez; Tremi+E,Otl N+Ee O J. A. | Positive displacement volumetric measuring device |
| CN104736252A (en) * | 2012-09-19 | 2015-06-24 | 诺信公司 | Metering device for a fluid |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5230459A (en) * | 1975-09-03 | 1977-03-08 | Hitachi Ltd | Optical position detecting device |
| JPS5437664U (en) * | 1977-08-18 | 1979-03-12 | ||
| JPS56101521A (en) * | 1980-01-19 | 1981-08-14 | Tokyo Riyousuiki Kogyosho:Kk | Measurement method for instrumental error of flow meter and its device |
-
1982
- 1982-04-22 JP JP6636582A patent/JPS58184514A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5230459A (en) * | 1975-09-03 | 1977-03-08 | Hitachi Ltd | Optical position detecting device |
| JPS5437664U (en) * | 1977-08-18 | 1979-03-12 | ||
| JPS56101521A (en) * | 1980-01-19 | 1981-08-14 | Tokyo Riyousuiki Kogyosho:Kk | Measurement method for instrumental error of flow meter and its device |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4815318A (en) * | 1985-04-03 | 1989-03-28 | Lopresti William J | Bearing-less positive displacement flow meter |
| JPS6286516U (en) * | 1985-11-20 | 1987-06-02 | ||
| JPH0323536Y2 (en) * | 1985-11-20 | 1991-05-22 | ||
| US4911010A (en) * | 1988-08-12 | 1990-03-27 | Flowdata, Inc. | Fluid flowmeter |
| US5325715A (en) * | 1989-08-09 | 1994-07-05 | Flowdata, Inc. | Fluid flowmeter |
| US5627313A (en) * | 1993-11-15 | 1997-05-06 | Gomez; Tremi+E,Otl N+Ee O J. A. | Positive displacement volumetric measuring device |
| CN104736252A (en) * | 2012-09-19 | 2015-06-24 | 诺信公司 | Metering device for a fluid |
| CN104736252B (en) * | 2012-09-19 | 2018-11-30 | 诺信公司 | metering device for fluid |
| US10155242B2 (en) | 2012-09-19 | 2018-12-18 | Nordson Corporation | Metering device for a fluid |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0427488B2 (en) | 1992-05-12 |
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