JP3406805B2 - Optical fiber core cutting machine - Google Patents
Optical fiber core cutting machineInfo
- Publication number
- JP3406805B2 JP3406805B2 JP18890897A JP18890897A JP3406805B2 JP 3406805 B2 JP3406805 B2 JP 3406805B2 JP 18890897 A JP18890897 A JP 18890897A JP 18890897 A JP18890897 A JP 18890897A JP 3406805 B2 JP3406805 B2 JP 3406805B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- optical fiber
- fiber core
- cutting machine
- holder
- 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
Links
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】この発明は、光ファイバ心線の先
端切除機における光ファイバ心線の切断屑を回収する回
収装置に関するものであり、光ファイバ心線の切断面が
光ファイバ心線の切断屑の端面と接触して傷付くことを
確実に防止することができるものであり、切断面の傷に
よる接続不良が起きることを確実に回避することができ
るものである。
【０００２】
【従来の技術】光ファイバを接続するについては、その
被覆を除去し、光ファイバ心線を所定長さ露出させ、そ
の先端を改めて切断して光ファイバ心線の接続端面を整
えることが必要である。ところで、この光ファイバ心線
の切断作業において発生する光ファイバ心線の切断屑は
硬くて細いために粗雑に取扱うと作業者の手に刺さって
怪我をする恐れがあり、また細くて透明であるために、
これが散乱してしまうと拾い集めることが極めて困難で
ある。これらの問題に対処するために、切断機にセット
された光ファイバ心線の切断屑をローラで把持させてお
いて、切断後に当該ローラを回転させて切断屑を繰り出
し、切断機に付設した屑箱に直接収容するようにしてい
る。この光ファイバ心線の切断機における光ファイバ切
断屑を回収する回収装置（特願平８−２７１５９８号）
の機構は図１に示すものである。この切断機の概要を図
１、図２を参照しつつ説明する。この光ファイバ心線の
切断機１はファイバホルダ２、一対の心線受台３、４、
心線受ローラ５を有し、切断機１の端部に屑箱６が着脱
自在に取付けられている。蓋体７に心線押えローラ５ａ
が設けられており、また他の蓋体８に一対の心線押え３
ａ、４ａが設けられている。光ファイバｆを装着してフ
ァイバホルダ２に保持させ、光ファイバ心線ｆａを心線
受台３、４及び心線受ローラ５に載せ、その後、蓋体７
及び８を閉じて心線押え３ａ、４ａと心線受台３、４に
よって光ファイバ心線ｆａを２点で把持させ、さらに心
線受ローラ５と蓋体７の心線押えローラ５ａとによって
光ファイバ心線ｆａの先端を把持させる。これによって
切断しようとする光ファイバｆのセッティングが完了す
る。心線受台３、４の間で光ファイバ心線の下面にカッ
タ１０によって切目を入れ、その後切目を入れられた部
分を破断治具（通常はマクラと称されるもの）１１で下
方に押えて光ファイバ心線ｆａを下方に撓ませ、切目を
入れたところで破断させる。光ファイバ心線ｆａの心線
受台４よりも先の部分が切断屑となるが、この切断屑は
心線受ローラ５と心線押えローラ５ａによって把持され
ているので、蓋体８を開いて心線押え３ａ、４ａによる
押えを解除しても、この切断屑が床に落下して散乱する
ことはない。心線受ローラ５、心線押えローラ５ａによ
って切断屑を把持させたままで心線受ローラ５の軸端の
つまみ９によって同ローラ５を反時計方向に回転させ、
切断屑を繰り出して直接屑箱６に落下させる。以上が従
来技術の概要であるが、このものについては、光ファイ
バ心線の破断面（鏡面状の平滑面）が傷付けられている
ことがままあり、この傷が接続精度を低下させる可能性
がある。光フアイバ心線の破断面（鏡面状の平滑面）が
傷付けられる原因は次ぎのように推測される。すなわ
ち、光ファイバ心線ｆａに対する心線受台３、４による
支持面と心線受ローラ５による支持面とは、光ファイバ
心線に無理に力を作用させることがないように同一水平
面になっている。したがって、光ファイバ心線が心線受
台３、４の間で破断され、破断治具１１が戻された状態
では、光ファイバ心線は破断される前の直線状態に弾性
復元して、切断屑の破断面と光ファイバ心線の破断面と
は互いに軽く接触した状態で対面している。光ファイバ
心線ｆａが破断されて、蓋体８が開かれて心線受台３、
４と蓋体８の心線押え３ａ、４ａとによる把持が解かれ
るとき、あるいは解かれた後に切断屑の破断面と光ファ
イバ心線の破断面とが相対的に動き（例えば微小振動、
微少回転）、破断面が擦り合うためと推測される。した
がってこの問題を回避するには、破断後の切断屑（心線
受台４と心線押え４ａによって把持されている部分）の
破断面と光ファイバ心線（心線受台３と心線押え３ａに
よって把持されている部分）の破断面とが軽く接触した
状態になることを回避すればよい。
【０００３】
【発明が解決しようとする課題】この発明は、上記問題
を回避することを目的として、破断治具（通常はマクラ
と称されるもの）で光ファイバ心線が撓まされて破断さ
れ、上記破断治具を戻したとき、破断後の切断屑（心線
受台４と心線押え４ａによって把持されている部分）の
破断面と光ファイバ心線（心線受台３と心線押え３ａに
よって把持されている部分）の破断面とが互いにずれた
位置に自然に戻るように光ファイバ心線ｆａの把持の仕
方を工夫することをその課題とするものである。
【０００４】
【課題を解決するための手段】上記課題解決のために講
じた手段は、光ファイバ心線に対する心線受ローラによ
る支持面の位置を心線受台による支持面よりも下方又は
上方にずらしたことである。
【０００５】
【作 用】心線受台３、４に支持させ、心線押え３ａ、
４ａとによって把持させて光ファイバ心線ｆａを水平に
固定した後、心線受ローラ５、心線押えローラ５ａによ
って光ファイバ心線の先端部分を把持させると、心線受
ローラ５による支持面の位置が光ファイバ心線ｆａに対
する心線受台３、４による支持面よりも下方（又は上
方）にずらしたので、心線受ローラ５と心線受台４との
間の部分において光ファイバ心線ｆａは下方（又は上
方）に撓まされた状態で心線受ローラ５、心線押えロー
ラ５ａによって把持される。心線受台３、４の間で光フ
ァイバ心線を破断治具１１（図２参照）で押し下げて破
断させ、破断治具１１を上方に戻すと心線受台３と同受
台４の間において光ファイバ心線ｆａは水平状態に戻
り、破断面は同一直線上において対向するが、心線受ロ
ーラ５と心線受台４との間の部分において切断屑ｆｂは
下方（又は上方）に撓まされ（図３参照）、その外端が
心線受ローラ５、心線押えローラ５ａによって把持さ
れ、固定されているので、心線受台４から心線押え４ａ
が離間するにつれて切断屑ｆｂの内端が上方（又は下
方）に跳ねる。したがって、心線受台４から心線押え４
ａが離間する瞬間に、切断屑ｆｂの破断面Ｅ1が光ファ
イバ心線ｆａの破断面Ｅ2から上方（又は下方）にずれ
る。したがって、その後の蓋体８が完全に開かれるまで
の間の切断屑ｆｂの破断面Ｅ1に対する光ファイバ心線
ｆａの破断面Ｅ2に対する種々の相対動に拘らず、両破
断面Ｅ1とＥ2とが互いに擦り合うことはない。
【０００６】
【実 施 例】図３、図４を参照しつつ実施例を説明す
る。切断装置は、心線受台の配置等については図１に示
す従来例と特に違うところはない。この装置で光ファイ
バ心線に傷を入れた後、破断治具（マクラ）１１により
光ファイバ心線をひずませ切断し、心線押え４ａおよび
３ａは光ファイバ心線が切断されると同時に開く構造で
ある。この構造は心線押え４ａおよび３ａが連動して開
くようになっているが、このように連動して開いても光
ファイバ心線ｆａは長く延びているので自重があり、該
心線ｆａは動くことはない。なお、上記心線押え３ａを
後で開くようにすることもできる。この実施例において
は心線受台４の外側面４１と心線受ローラ５との間隔Ｌ
は１０．５ｍｍであり、光ファイバ心線に対する心線受
ローラ５の支持面が距離Ｂ（０．５ｍｍ）だけ下がるよ
うに、心線受ローラ５を従来技術のそれよりも０．５ｍ
ｍに下げている。心線押え４ａが心線受台４から若干離
間すると切断屑ｆｂの破断端部は心線受台４の上端支持
面４１を支点として上方に跳ねるが、光ファイバ心線の
線径が１２５μｍのときは、破断面Ｅ1が１２５μｍだ
け上方に変位したときに、破断面Ｅ1は光ファイバ心線
の破断面Ｅ2から完全に上方にずれる。したがって、心
線押え４ａが上方に移動し始めた瞬間に、切断屑ｆｂの
破断面Ｅ1に対して光ファイバ心線の破断面Ｅ2は完全に
上下にずれるから、蓋体８（図１）の開放動作中におい
て両破断面Ｅ1、Ｅ2が互いに擦り合うことは完全に回避
される。心線受ローラ５を上方にずらす場合も同様であ
る。この場合は切断屑ｆｂの破断端は下方に跳ねること
になるが、切断屑ｆｂを心線受ローラ５を回転させて繰
り出すとき切断屑ｆｂは斜め上方に引き出されることに
なるから、屑箱に落下させるという観点からは、余り望
ましいことではないが実用上支障はない。
【０００７】
【効 果】以上述べたように、切断後の破断面の擦り合
いによる光ファイバ心線の破断面（接続端面）が傷付く
こと、これによって接続不良が生じることを確実に防止
できる。このことは本発明の最大の効果である。例え
ば、破断治具１１（図２参照）によって光ファイバ心線
を押えて破断させて後、破断治具１１で光ファイバ心線
を押えたままで心線受台４と心線押え４ａとによる切断
屑ｆｂに対する把持を緩めておいて、心線受ローラ５を
回転させて切断屑ｆｂをその軸線方向に移動させてその
破断面Ｅ1を光ファイバ心線ｆａの破断面Ｅ2から引き離
し、その後に破断治具１１を上方に戻して光ファイバ心
線を復元させることによっても、本発明の上記課題を解
決することができる。しかし、このような操作は従来の
操作と異なり、作業性が悪い。これに対してこの発明
は、心線受ローラ５の位置を上下方向にずらすだけであ
り、切断機の機構や操作方法を変更するものではないか
ら、実施のためのコスト増等のマイナスは全くない。こ
のことはこの発明の大きな利点である。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collecting device for collecting cuttings from an optical fiber core in an end cutting machine for an optical fiber core. It is possible to reliably prevent the cut surface of the wire from being damaged by contact with the end surface of the cutting waste of the optical fiber core wire, and it is possible to reliably avoid the occurrence of connection failure due to the damage of the cut surface. You can do it. In connection with an optical fiber, the coating is removed, the optical fiber is exposed for a predetermined length, and the end is cut again to prepare the connection end face of the optical fiber. is necessary. By the way, the cutting waste of the optical fiber core wire generated in the cutting operation of the optical fiber core wire is hard and thin, so if handled roughly, there is a risk of being stuck in an operator's hand and causing injury, and is also thin and transparent. for,
If this is scattered, it is extremely difficult to pick it up. In order to deal with these problems, the cutting waste of the optical fiber core wire set in the cutting machine is held by a roller, and after cutting, the roller is rotated to feed out the cutting waste, and the waste attached to the cutting machine is removed. They are housed directly in boxes. Collection device for collecting optical fiber cuttings in this optical fiber core cutting machine (Japanese Patent Application No. 8-271598).
This mechanism is shown in FIG. An outline of the cutting machine will be described with reference to FIGS. The optical fiber core cutting machine 1 includes a fiber holder 2, a pair of core holders 3, 4,
It has a core receiving roller 5, and a waste box 6 is detachably attached to an end of the cutting machine 1. A cord holding roller 5a is attached to the lid 7
The other lid 8 is provided with a pair of core holders 3.
a, 4a are provided. The optical fiber f is attached and held by the fiber holder 2, and the optical fiber core fa is placed on the core holders 3 and 4 and the core roller 5.
And 8 are closed to hold the optical fiber core fa at two points by the core holders 3a, 4a and the core holders 3, 4, and further by the core receiving roller 5 and the core holder roller 5a of the lid 7. The tip of the optical fiber core fa is gripped. Thus, the setting of the optical fiber f to be cut is completed. A cut is made in the lower surface of the optical fiber core between the cable holders 3 and 4 by a cutter 10, and the cut portion is then held down by a breaking jig (usually called a mache) 11. The optical fiber core fa is bent downward, and is broken when a cut is made. The portion of the optical fiber core fa that is ahead of the core holder 4 becomes cutting chips. Since the cutting chips are gripped by the core receiving roller 5 and the core pressing roller 5a, the lid 8 is opened. Even if the pressing by the core pressers 3a and 4a is released, the cutting waste does not fall to the floor and be scattered. While the cutting waste is being gripped by the core receiving roller 5 and the core pressing roller 5a, the roller 5 is rotated counterclockwise by the knob 9 at the shaft end of the core receiving roller 5,
The cutting waste is fed and dropped directly into the waste box 6. The above is an outline of the prior art. However, in this case, the broken surface (smooth surface of mirror surface) of the optical fiber core wire may be damaged, and this scratch may reduce the connection accuracy. is there. The cause of damage to the fractured surface (mirror-like smooth surface) of the optical fiber core wire is assumed as follows. In other words, the support surfaces of the optical fiber cores fa by the core receivers 3 and 4 and the support surfaces by the core receiver rollers 5 are in the same horizontal plane so as not to apply force to the optical fiber core. ing. Therefore, in a state where the optical fiber core is broken between the core holders 3 and 4 and the breaking jig 11 is returned, the optical fiber core is elastically restored to the straight state before the break, and cut. The fracture surface of the debris and the fracture surface of the optical fiber core line face each other in a lightly contacting state. The optical fiber core fa is broken, and the lid 8 is opened to open the core holder 3,
When the gripping of the cover 4 and the cover 8 by the core holders 3a, 4a is released, or after the release, the fracture surface of the cutting waste and the fracture surface of the optical fiber core move relatively (for example, minute vibration,
This is presumed to be due to friction between the fractured surfaces. Therefore, in order to avoid this problem, the broken surface of the cutting waste (the portion gripped by the core holder 4 and the core holder 4a) and the optical fiber cores (the core holder 3 and the core holder 4) are required to avoid this problem. It is only necessary to avoid a state in which the fractured surface of the part gripped by 3a) is in light contact with the fractured surface. [0003] In order to avoid the above-mentioned problems, the present invention aims to break the optical fiber by bending the optical fiber with a breaking jig (usually referred to as a macula). Then, when the breaking jig is returned, the broken surface of the cut debris (portion gripped by the core holder 4 and the core presser 4a) and the optical fiber core (the core holder 3 and the core) are broken. It is an object of the present invention to devise a way of gripping the optical fiber core fa so that the fractured surface of the portion held by the wire holder 3a) naturally returns to a position shifted from each other. Means taken to solve the above-mentioned problem is that the position of the support surface of the core receiving roller with respect to the optical fiber core is lower or above the support surface of the core receiver. It is shifted to. [Work] The core holders 3a and 4 support the core holders 3 and 4,
4a, the optical fiber core fa is fixed horizontally, and then the leading end of the optical fiber core is gripped by the core receiving roller 5 and the core pressing roller 5a. Is shifted below (or above) the support surface of the optical fiber cable fa by the cable receivers 3 and 4, so that the optical fiber is located between the cable receiver roller 5 and the cable receiver 4. The core wire fa is held by the core wire receiving roller 5 and the core wire pressing roller 5a in a state of being bent downward (or upward). The optical fiber core wire is pushed down by the breaking jig 11 (see FIG. 2) between the core holders 3 and 4 to be broken, and when the breaking jig 11 is returned to the upper side, the core holder 3 and the holder 4 are separated. The optical fiber core fa returns to the horizontal state in between, and the fracture surfaces oppose each other on the same straight line, but the cutting waste fb is lower (or upper) in the portion between the core receiving roller 5 and the core receiver 4. (See FIG. 3), and the outer end thereof is gripped and fixed by the core wire receiving roller 5 and the core wire pressing roller 5a.
The inner end of the cutting waste fb rebounds upward (or downward) as the distance increases. Therefore, from the core holder 4 to the core holder 4
the moment the a is separated, fracture surface E 1 of the cuttings fb is displaced from the fracture surface E 2 of the optical fiber fa upward (or downward). Therefore, regardless of the various relative movement with respect to the fracture surface E 2 of the optical fiber fa for fracture surface E 1 of the cuttings fb of until subsequent lid 8 is fully opened, the two fracture surfaces E 1 E 2 and is not able to rub against each other. An embodiment will be described with reference to FIGS. 3 and 4. FIG. The cutting device is not particularly different from the conventional example shown in FIG. After the optical fiber core is scratched by this apparatus, the optical fiber core is distorted and cut by a breaking jig (makura) 11, and the core holders 4a and 3a simultaneously cut the optical fiber core. Open structure. In this structure, the cord pressers 4a and 3a are opened in conjunction with each other. However, even when the cord pressers are opened in such a manner, the optical fiber cord fa is elongated and has its own weight. It does not move. In addition, the above-mentioned core presser 3a can be opened later. In this embodiment, the distance L between the outer side surface 41 of the core receiving base 4 and the core receiving roller 5 is set.
Is 10.5 mm, so that the supporting surface of the core receiving roller 5 with respect to the optical fiber core is lowered by a distance B (0.5 mm) by 0.5 m from the prior art.
m. When the core holder 4a is slightly separated from the core holder 4, the broken end of the cutting waste fb springs upward with the upper end support surface 41 of the core holder 4 as a fulcrum, but the optical fiber core diameter is 125 μm. time, when the fracture surface E 1 is displaced upward by 125 [mu] m, fracture surface E 1 is completely displaced upwards from the fracture surface E 2 of the optical fiber. Accordingly, the moment the cord retainer 4a begins to move upward, since fracture surfaces E 2 of the optical fiber is shifted completely up and down with respect to the fracture surface E 1 of swarf fb, the lid 8 (FIG. 1 During the opening operation of ( 1) , rubbing of the two fractured surfaces E 1 and E 2 with each other is completely avoided. The same applies when the core receiving roller 5 is shifted upward. In this case, the broken end of the cutting waste fb will spring downward, but when the cutting waste fb is fed out by rotating the core receiving roller 5, the cutting waste fb is drawn obliquely upward. From the viewpoint of dropping, this is not very desirable, but does not hinder practical use. As described above, it is possible to reliably prevent the fractured surface (connection end face) of the optical fiber core wire from being damaged due to the rubbing of the fractured surface after cutting, and the occurrence of poor connection due to this. . This is the greatest effect of the present invention. For example, after the optical fiber is held down by the breaking jig 11 (see FIG. 2) to break it, the cutting is performed by the core holder 4 and the wire holder 4a while holding the optical fiber with the breaking jig 11. keep in loosening the grip on debris fb, by rotating the core wire receiving roller 5 is moved to cut chips fb in the axial direction pulling away the broken plane E 1 from the fracture surface E 2 of the optical fiber fa, then The above object of the present invention can also be solved by returning the breaking jig 11 upward to restore the optical fiber core. However, such an operation is different from the conventional operation and has poor workability. On the other hand, the present invention merely shifts the position of the core receiving roller 5 in the vertical direction, and does not change the mechanism or operating method of the cutting machine. Absent. This is a great advantage of the present invention.
【図面の簡単な説明】 【図１】従来の切断機の斜視図である。 【図２】従来の切断機の一部拡大断面図である。 【図３】実施例の一部拡大断面図である。 【符号の説明】 １・・・切断機 ３、４・・・心線受台 ３ａ、４ａ・・・心線押え ５・・・心線受ローラ ５ａ・・・心線押えローラ ６・・・屑箱 ７、８・・・蓋体 ９・・・つまみ １０・・・カッタ １１・・・破断治具（マクラ） ４１・・・心線受台４の外側面 １１・・・ ｆ・・・光ファイバ ｆａ・・・光ファイバ心線 ｆｂ・・切断屑 Ｅ1・・・切断屑ｆｂの破断面 Ｅ2・・・光ファイバ心線ｆａの破断面BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a conventional cutting machine. FIG. 2 is a partially enlarged sectional view of a conventional cutting machine. FIG. 3 is a partially enlarged sectional view of the embodiment. [Description of Signs] 1 ... Cutting machine 3, 4 ... Core holder 3a, 4a ... Core holder 5 ... Core receiver roller 5a ... Core holder roller 6 ... Scrap boxes 7, 8 Lid 9 Knob 10 Cutter 11 Breaking jig (makura) 41 Outer surface 11 of core holder 4 f fracture surface of the optical fiber fa ... optical fiber fb · · swarf E 1 fracture surface ... swarf fb E 2 ... optical fiber fa
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 6/00 G02B 6/24 G02B 6/36 - 6/40 B26D 3/16 ──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. 7 , DB name) G02B 6/00 G02B 6/24 G02B 6/36-6/40 B26D 3/16
Claims (1)
心線押えとによって把持させ、心線の先端部を心線受ロ
ーラと心線押えローラによって把持させ、一対の心線受
台及び心線押えによる把持部の中間部分において光ファ
イバ心線を破断させ、心線受ローラを回転させて心線の
切断屑を繰出して、これを付設された屑箱に直接落下さ
せて収集するようにした、光ファイバ心線の切断機にお
いて、 光ファイバ心線に対する心線受ローラによる支持面の位
置を心線受台による支持面よりも下方又は上方にずらし
た光ファイバ心線の切断機。(57) [Claims] [Claim 1] An optical fiber core is gripped by a pair of core holders and a pair of core holders, and the leading end of the core is held by a core receiving roller and a core holder. The optical fiber core wire is broken at the middle part of the holding part by the pair of core holders and the core presser by the rollers, and the core receiving roller is rotated to feed out the cuttings of the core wire, and this is attached. In the optical fiber core cutting machine, which is collected by directly dropping the collected waste into a waste box, the position of the supporting surface of the core receiving roller with respect to the optical fiber core is below or below the supporting surface of the core receiving base. Optical fiber core cutting machine shifted upward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18890897A JP3406805B2 (en) | 1997-07-01 | 1997-07-01 | Optical fiber core cutting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18890897A JP3406805B2 (en) | 1997-07-01 | 1997-07-01 | Optical fiber core cutting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1123852A JPH1123852A (en) | 1999-01-29 |
| JP3406805B2 true JP3406805B2 (en) | 2003-05-19 |
Family
ID=16232000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18890897A Expired - Lifetime JP3406805B2 (en) | 1997-07-01 | 1997-07-01 | Optical fiber core cutting machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3406805B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0734826B1 (en) * | 1995-03-27 | 1998-01-21 | Basf Aktiengesellschaft | Process for producing thermoplastic resins |
| KR100346222B1 (en) * | 2000-09-07 | 2002-08-01 | 삼성전자 주식회사 | Optical fiber gathering device for a optical fiber drawing device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0446028A (en) * | 1990-06-14 | 1992-02-17 | Asahi Glass Co Ltd | Optical fiber cutter |
| JPH05323126A (en) * | 1992-05-18 | 1993-12-07 | Furukawa Electric Co Ltd:The | Optical fiber terminal processing machine |
-
1997
- 1997-07-01 JP JP18890897A patent/JP3406805B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1123852A (en) | 1999-01-29 |
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