JPS63224919A - Stamper holding structure in disk molding machine - Google Patents
Stamper holding structure in disk molding machineInfo
- Publication number
- JPS63224919A JPS63224919A JP62059850A JP5985087A JPS63224919A JP S63224919 A JPS63224919 A JP S63224919A JP 62059850 A JP62059850 A JP 62059850A JP 5985087 A JP5985087 A JP 5985087A JP S63224919 A JPS63224919 A JP S63224919A
- Authority
- JP
- Japan
- Prior art keywords
- stamper
- holding
- mold
- contact
- outer peripheral
- 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
- 238000000465 moulding Methods 0.000 title claims abstract description 14
- 230000002093 peripheral effect Effects 0.000 claims description 23
- 239000012778 molding material Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005323 electroforming Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/34—Moulds having venting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/263—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
- B29C45/2632—Stampers; Mountings thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/006—Using vacuum
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Manufacturing Optical Record Carriers (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は光学ディスク等を製造するディスク成形機に
おけるスタンパ保持構造の改良に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to an improvement of a stamper holding structure in a disk molding machine for manufacturing optical disks and the like.
（従来の技術）
光学ディスクを射出成形によって製造するに際しては、
一般に、情報記録面であるディスク信号部を備えたスタ
ンパをその外周部を保持する取付鍔部を有するスタンパ
押えリングによってスタンパ保持金型に挟持せしめてキ
ャビティを構成し。(Prior art) When manufacturing optical discs by injection molding,
In general, a cavity is formed by holding a stamper having a disk signal area, which is an information recording surface, in a stamper holding mold using a stamper holding ring having a mounting flange for holding the outer circumference of the stamper.
このキャビティ内に成形材料を射出してディスクの成形
を行なっている。Molding material is injected into this cavity to mold the disk.
しかるに、ディスク信号部を備えたスタンパは母型から
金属電鋳等によって複製されたものが用いられるのであ
るが、実際の成形に際してはスタンパが金型の温調また
はキャビティ内に注入された溶融樹脂によって熱せられ
ると熱膨張力が生ずる。さらに、キャビティ内を流動す
る溶融樹脂の力によってスタンパに対してその面方向つ
まり外周方向への引張力が働き、さきの熱膨張力と共働
して、スタンパはその外周半径方向へ膨張変形する。し
たがって、この種のスタンパ保持構造にあっては、この
ような膨張変形が比較的円滑に行なわれることができる
ように通常数ミクロン程度の間隙をもって挟持される。However, the stamper with the disk signal part is made from a mother mold by metal electroforming, etc., but during actual molding, the stamper is used to control the temperature of the mold or to adjust the temperature of the molten resin injected into the cavity. When heated by , a thermal expansion force is generated. Furthermore, the force of the molten resin flowing inside the cavity exerts a tensile force on the stamper in the direction of its surface, that is, in the direction of its outer circumference, and in conjunction with the thermal expansion force, the stamper expands and deforms in the radial direction of its outer circumference. . Therefore, in this type of stamper holding structure, the stamper is usually held with a gap of about several microns so that such expansion and deformation can be performed relatively smoothly.
ところで、このスタンパの製作に際しては、その外径を
打抜き加工によって決定しているために外周辺縁部に刃
物によるいわゆる「かえり」や「そり」を生ずることが
しばしばある。スタンパの外周辺縁部にかえりやそりを
有する場合には、上述した外周半径方向への膨張変形が
スムーズに行なわれない鵡いがある。以下添付の第３図
および第４図の図面に基いてくわしく説明する。By the way, when manufacturing this stamper, since its outer diameter is determined by punching, so-called "burrs" or "curves" are often produced on the outer peripheral edge due to the cutter. If the outer peripheral edge of the stamper has burrs or warps, the above-mentioned expansion and deformation in the outer peripheral radial direction may not be carried out smoothly. A detailed explanation will be given below based on the attached drawings of FIGS. 3 and 4.
第３図は従来のスタンパ保持構造を示したものであるが
、キャビティＣは、成形品表面部を規定するための固定
型５０のキャビテイ面５１と、該成形品の外周側面部を
規定する環状リング部材５３、および成形品情報記録面
を成形するための可動１！６０に保持されたスタンパ７
０とから構成されている。モして、前記スタンパ７０は
、該スタンパの外周部７１を保持する取付鍔ＷＡ６Ｂを
備えたスタンパ押えリング６５によって可動型６０に挟
持されている。第４図はスタンパ保持部の要部を拡大し
たものであるが、この種の構造にあっては、図のように
、前記スタンパ押えリング６５の内壁部６７の直径をス
タンパ７０の外径より大きく形成して、スタンパ外周部
７１の外側に空所Ｓｌを形成し、もって、スタンパ７０
の外周方向への膨張変形が可能なように設計される０図
の符号６８は数ミクロン程度の間隙を表わす。FIG. 3 shows a conventional stamper holding structure, in which the cavity C has a cavity surface 51 of the fixed die 50 for defining the surface of the molded product, and an annular shape that defines the outer peripheral side surface of the molded product. The ring member 53 and the stamper 7 held by the movable member 1!60 for molding the molded product information recording surface.
It is composed of 0. The stamper 70 is held by the movable die 60 by a stamper holding ring 65 provided with a mounting collar WA6B that holds the outer peripheral portion 71 of the stamper. FIG. 4 is an enlarged view of the main part of the stamper holding part. In this type of structure, as shown in the figure, the diameter of the inner wall part 67 of the stamper holding ring 65 is larger than the outer diameter of the stamper 70. By forming a large space Sl on the outside of the stamper outer circumferential portion 71, the stamper 70
Reference numeral 68 in Figure 0 represents a gap of several microns, which is designed to allow expansion and deformation in the outer circumferential direction.
しかしながら、この従来のスタンパ保持構造においては
、スタンパ７０の外周ｆｉ７１に第４図のようなそり部
７３を有する場合には、上述の熱膨張変形が起こった際
に、スタンパ７０の膨張変形がスタンパ外周部７１の当
該そり部７３の存在によって該部分で阻害されるために
、スタンパ７０の本体面に部分的な歪み変形を生ずるこ
とがしばしばあった。このようなスタンパフ０自体に生
ずる異常な歪み変形は、第３図に図示したように、スタ
ンパ保持金ｆｉ８０の鏡面６１との間に空気介在部Ａを
生ぜしめ、その結果、空気の断熱作用によって樹脂材料
が冷却不足となって光学ディスクの外観不良をきたし、
ひいては光学検索の誤動作を招くおそれがあった。However, in this conventional stamper holding structure, when the outer periphery fi71 of the stamper 70 has a warped portion 73 as shown in FIG. Due to the presence of the warped portion 73 on the outer circumferential portion 71, the main body surface of the stamper 70 is often partially distorted because it is obstructed at this portion. As shown in FIG. 3, such abnormal distortion and deformation occurring in the stamper puff 0 itself causes an air intervening part A between it and the mirror surface 61 of the stamper holder fi80, and as a result, due to the heat insulating effect of the air, The resin material becomes insufficiently cooled, resulting in poor appearance of the optical disc.
This may even lead to malfunction of the optical search.
（発明が解決しようとする問題点）
この発明は上述したような問題点に鑑みて提案されたも
のであって、その目的とするところは。(Problems to be Solved by the Invention) This invention has been proposed in view of the above-mentioned problems, and its objectives are as follows.
スタンパの膨張変形に際してスタンパの外周にそりやか
えりがあったとしても、スタンパ自体に対して異常な歪
み変形を生じさせることのない、換言すればスタンパの
スムーズな膨張変形を可能とする新規なスタンパ保持構
造を提供することを主たる目的とするものである。A new stamper that does not cause abnormal distortion or deformation of the stamper itself even if there is a warp or burr on the outer periphery of the stamper during expansion and deformation of the stamper.In other words, a new stamper that enables smooth expansion and deformation of the stamper. Its primary purpose is to provide a holding structure.
（問題点を解決するための手段）
すなわち、この発明は、ディスク信号部を備えたスタン
パをその外周部を保持する取付鍔部を有するスタンパ押
えリングによってスタンパ保持金型に挟持せしめてキャ
ビティを構成し該キャビティ内に成形材料を射出して所
定のディスクを成形するようにしたものにおいて、前記
スタンパ押えリングの取付鍔部内側に前記スタンパ外周
辺縁部が接触しない環状凹溝部を形成するとともに、前
記スタンパ保持金型にも前記スタンパ外周辺縁部が接触
しない凹陥部を形成して前記スタンパの外周辺縁部が非
接触状態となるように金型に保持されていることを特徴
とするディスク成形機におけるスタンパ保持構造に係る
。(Means for Solving the Problems) That is, in the present invention, a cavity is constructed by sandwiching a stamper provided with a disk signal part in a stamper holding mold by a stamper holding ring having a mounting flange for holding the outer peripheral part of the stamper. In a device in which a predetermined disk is molded by injecting a molding material into the cavity, an annular groove portion is formed inside the mounting flange of the stamper holding ring with which the outer peripheral edge of the stamper does not come into contact; The disk is characterized in that the stamper holding mold is also formed with a concave portion that does not make contact with the outer peripheral edge of the stamper, and is held in the mold so that the outer peripheral edge of the stamper is in a non-contact state. This relates to a stamper holding structure in a molding machine.
（作用）
この発明のスタンパ保持構造によれば、スタンパが金型
に保持された際、スタンパの外周辺ｍ部は押えリングお
よび保持金型のいずれにも非接触の状態で保持される。(Function) According to the stamper holding structure of the present invention, when the stamper is held in the mold, the outer periphery m of the stamper is held in a non-contact state with either the holding ring or the holding mold.
従って、スタンパの外周辺縁部にそり部やかえり部を有
していても、ディスクの成形時に当該そり部やかえり部
によってスタンパの自然な膨張変形が妨げられることが
ない。Therefore, even if the stamper has a curvature or burr on its outer peripheral edge, the curvature or burr does not hinder the natural expansion and deformation of the stamper during disk molding.
さらに、この発明構造によればスタンパの外周辺縁部が
保持金型の凹陥部内に突出して保持されているために、
スタンパの交換時等において金型鏡面に密着しているス
タンパの除去が容易に行なわれる。Furthermore, according to the structure of the present invention, since the outer peripheral edge of the stamper is held in a protruding manner within the concave portion of the holding mold,
When replacing the stamper, the stamper that is in close contact with the mirror surface of the mold can be easily removed.
（実施例）
以下、この発明の実施例を図面にしたがって説明すると
、添付の図面第１図はこの発明の−実施例を示すディス
ク成形機におけるスタンパ保持構造の断面図、第２図は
その要部拡大図である。(Example) Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 of the accompanying drawings is a sectional view of a stamper holding structure in a disk molding machine showing an embodiment of the present invention, and FIG. 2 is a schematic view of the structure. It is an enlarged view of the part.
第１図にはこのディスク成形機の型開き状態が図示され
る。キャビティＣは、成形品表面部を規定する固定型ｌ
Ｏのキャビテイ面１１と、成形品の外周側面部を規定す
る内周壁１４を有する環状リング部材１３、および成形
品情報記録面を成形するための可動型２０に保持された
スタンパ３０とから構成されている。スタンパ３０は、
図示したように、該スタンパの外周部３１を保持する取
付鍔部４６を備えた環状のスタンパ押えリング４５によ
って可動型２０の鏡面２１に保持されている０図の符号
４９は数ミクロン程度の間隙を表わす。FIG. 1 shows the disk molding machine in its mold open state. Cavity C is a fixed mold l that defines the surface of the molded product.
It consists of a cavity surface 11 of O, an annular ring member 13 having an inner circumferential wall 14 that defines the outer peripheral side surface of the molded product, and a stamper 30 held in a movable mold 20 for molding the molded product information recording surface. ing. The stamper 30 is
As shown in the figure, reference numeral 49 in FIG. 0 is held on the mirror surface 21 of the movable mold 20 by an annular stamper holding ring 45 equipped with a mounting flange 46 that holds the outer peripheral part 31 of the stamper, with a gap of about several microns. represents.
第２図に図示したように、この発明のスタンパ保持構造
においては、前記スタンパ押えリング４５の取付鍔部４
６内側にスタンパ３０の外周辺縁部３２が接触しない環
状凹溝部４８が形成される。As shown in FIG. 2, in the stamper holding structure of the present invention, the mounting flange 4 of the stamper holding ring 45 is
6, an annular groove portion 48 is formed inside the stamper 30 with which the outer peripheral edge 32 of the stamper 30 does not come into contact.
とともに、スタンパ保持金型である可動型２０にもスタ
ンパ外周辺縁部３２が接触しない凹陥部２３が形成され
る。すなわち、スタンパ３ｏは、その外周辺縁Ｎ６３２
がスタンパ押えリング４５および可動型２０のいずれと
も非接触状態となるように金型に保持されるわけである
。At the same time, the movable mold 20 serving as the stamper holding mold is also formed with a concave portion 23 with which the outer peripheral edge 32 of the stamper does not come into contact. That is, the stamper 3o has its outer peripheral edge N632
is held in the mold so that it is not in contact with either the stamper holding ring 45 or the movable mold 20.
（効果）
上のように、この発明によれば、スタンパ押えリングの
環状凹溝部とスタンパ保持金型の凹陥部とによって形成
された空所Ｓ内にスタンパの外周辺縁部が非接触状態と
なるように金型に保持されるものであるから、前述した
ようなスタンパの打ち抜き加工による外周辺縁部のそり
部およびかえり部が存したとしても、スタンパの膨張変
形はスムーズに行なわれ、従来のようにスタンパのそり
部およびかえり部が引っ掛かってスタンパ本体面が歪変
形を生ずることは全く防止されることができるようにな
った。従って、スタンパ本体面の歪変形に起因する種々
の成形不良は悉く解消することができる。(Effects) As described above, according to the present invention, the outer peripheral edge of the stamper is kept in a non-contact state within the space S formed by the annular groove of the stamper holding ring and the recess of the stamper holding mold. Since the stamper is held in the mold in such a way that even if there are warps and burrs on the outer peripheral edge due to the stamper punching process as described above, the stamper expands and deforms smoothly, unlike conventional stampers. It is now possible to completely prevent distortion and deformation of the stamper main body surface due to the curvature and burrs of the stamper being caught. Therefore, all kinds of molding defects caused by distortion of the stamper main body surface can be eliminated.
また、この発明構造によればスタンパの外周辺縁部が保
持金型の凹陥部内に突出して保持されているために、ス
タンパの交換時等において金型鏡面に密着しているスタ
ンパの除去が容易に行なうことができるという利点があ
る。Furthermore, according to the structure of the present invention, since the outer peripheral edge of the stamper is held in a protruding manner within the concave portion of the holding mold, it is easy to remove the stamper that is in close contact with the mirror surface of the mold when replacing the stamper, etc. It has the advantage of being able to be carried out.
第１図はこの発明の一実施例を示すディスク成形機にお
けるスタンパ保持構造の断面図、第２図はその要部拡大
図、第３図は従来のスタンパ保持構造を示す断面図、第
４図はその要部拡大図である。
ｌＯ・・・固定型、２０・・・可動型、２１・・・可動
型鏡面、２３・・・可動型凹陥部、３０・・・スタンパ
、３１・・・スタンパ外周部、３２・・・スタンパ外周
縁部、４５・・・スタンパ押えリング、４６・・・取付
鍔部。
４８・・・環状凹溝部、Ｃ・・・キャビティ、Ｓ・・・
空所。Fig. 1 is a sectional view of a stamper holding structure in a disk molding machine showing an embodiment of the present invention, Fig. 2 is an enlarged view of the main part thereof, Fig. 3 is a sectional view showing a conventional stamper holding structure, and Fig. 4 is an enlarged view of the main part. lO... Fixed type, 20... Movable type, 21... Movable mirror surface, 23... Movable type recessed part, 30... Stamper, 31... Stamper outer periphery, 32... Stamper Outer peripheral edge, 45... Stamper holding ring, 46... Mounting flange. 48... Annular groove, C... Cavity, S...
Blank space.
Claims (1)
する取付鍔部を有するスタンパ押えリングによってスタ
ンパ保持金型に挟持せしめてキャビティを構成し該キャ
ビティ内に成形材料を射出して所定のディスクを成形す
るようにしたものにおいて、 前記スタンパ押えリングの取付鍔部内側に前記スタンパ
外周辺縁部が接触しない環状凹溝部を形成するとともに
、前記スタンパ保持金型にも前記スタンパ外周辺縁部が
接触しない凹陥部を形成して前記スタンパの外周辺縁部
が非接触状態となるように金型に保持されていることを
特徴とするディスク成形機におけるスタンパ保持構造。[Claims] A stamper equipped with a disk signal part is held in a stamper holding mold by a stamper holding ring having a mounting flange for holding the outer periphery of the stamper to form a cavity, and a molding material is injected into the cavity. In the stamper holding mold, an annular groove portion is formed inside the mounting flange portion of the stamper holding ring so that the outer peripheral edge of the stamper does not come into contact with the stamper holding mold. 1. A stamper holding structure for a disk molding machine, characterized in that the stamper is held in a mold so that the outer peripheral edge of the stamper is in a non-contact state by forming a recessed part with which the peripheral edge does not contact.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62059850A JPS63224919A (en) | 1987-03-13 | 1987-03-13 | Stamper holding structure in disk molding machine |
| US07/098,361 US4795127A (en) | 1986-09-27 | 1987-09-18 | Mold assembly of injection-molding machine |
| AT87308425T ATE71873T1 (en) | 1986-09-27 | 1987-09-23 | MOLD ASSEMBLY FOR INJECTION MOLDING MACHINE. |
| AT91105210T ATE114541T1 (en) | 1986-09-27 | 1987-09-23 | MOLD ASSEMBLY FOR INJECTION MOLDING MACHINE. |
| EP87308425A EP0262863B1 (en) | 1986-09-27 | 1987-09-23 | Mold assembly of injection-moulding machine |
| DE8787308425T DE3776250D1 (en) | 1986-09-27 | 1987-09-23 | MOLD ASSEMBLY FOR INJECTION MOLDING MACHINE. |
| DE3750819T DE3750819T2 (en) | 1986-09-27 | 1987-09-23 | Mold assembly for injection molding machine. |
| EP91105210A EP0451673B1 (en) | 1986-09-27 | 1987-09-23 | Mold assembly of injection-molding machine |
| KR1019870010756A KR900005910B1 (en) | 1987-03-13 | 1987-09-28 | Mould assembly of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62059850A JPS63224919A (en) | 1987-03-13 | 1987-03-13 | Stamper holding structure in disk molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63224919A true JPS63224919A (en) | 1988-09-20 |
| JPH0455565B2 JPH0455565B2 (en) | 1992-09-03 |
Family
ID=13125084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62059850A Granted JPS63224919A (en) | 1986-09-27 | 1987-03-13 | Stamper holding structure in disk molding machine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS63224919A (en) |
| KR (1) | KR900005910B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03180314A (en) * | 1989-11-27 | 1991-08-06 | Krauss Maffei Ag | Bush for axially retaining and radially centering mother die in injection molding tool |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101505272B1 (en) * | 2013-04-09 | 2015-03-23 | 현대하이스코 주식회사 | Hot stamping device and method |
-
1987
- 1987-03-13 JP JP62059850A patent/JPS63224919A/en active Granted
- 1987-09-28 KR KR1019870010756A patent/KR900005910B1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03180314A (en) * | 1989-11-27 | 1991-08-06 | Krauss Maffei Ag | Bush for axially retaining and radially centering mother die in injection molding tool |
Also Published As
| Publication number | Publication date |
|---|---|
| KR900005910B1 (en) | 1990-08-16 |
| JPH0455565B2 (en) | 1992-09-03 |
| KR880010896A (en) | 1988-10-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |