JPS6328004B2 - - Google Patents
Info
- Publication number
- JPS6328004B2 JPS6328004B2 JP57061429A JP6142982A JPS6328004B2 JP S6328004 B2 JPS6328004 B2 JP S6328004B2 JP 57061429 A JP57061429 A JP 57061429A JP 6142982 A JP6142982 A JP 6142982A JP S6328004 B2 JPS6328004 B2 JP S6328004B2
- Authority
- JP
- Japan
- Prior art keywords
- center
- disk
- molding
- mold
- disc
- 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
Links
- 238000000465 moulding Methods 0.000 claims description 17
- 239000012778 molding material Substances 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 15
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000012768 molten material Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000007906 compression Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000000748 compression moulding Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- RRLHMJHRFMHVNM-BQVXCWBNSA-N [(2s,3r,6r)-6-[5-[5-hydroxy-3-(4-hydroxyphenyl)-4-oxochromen-7-yl]oxypentoxy]-2-methyl-3,6-dihydro-2h-pyran-3-yl] acetate Chemical compound C1=C[C@@H](OC(C)=O)[C@H](C)O[C@H]1OCCCCCOC1=CC(O)=C2C(=O)C(C=3C=CC(O)=CC=3)=COC2=C1 RRLHMJHRFMHVNM-BQVXCWBNSA-N 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
-
- 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
- B29C2045/2653—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs using two stampers
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Manufacturing Optical Record Carriers (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は音声レコードやビデイオデイスク等の
円盤状記録媒体（以下デイスクと呼ぶ）の成形装
置に関するもので、特にデイスク成形時における
デイスクの中心孔の成形手段に特徴を有するもの
である。従来からデイスクの中心孔の成形方法と
して型締装置と一対のデイスク成形金型に直接射
出装置でデイスク材料をデイスク成形用金型中心
部より供給するデイスク成形装置では、数ミリの
間隔をもつて対向するよう設定された両金型間に
デイスク材料を射出して圧縮成形工程中に、デイ
スク成形用金型中心部に対向するよう設定され別
な手段で駆動される中心孔成形用可動センターピ
ンと固定センターピンがデイスク記録部を成形す
る前に圧接して、デイスク中心孔を、まず成形し
てから記録部を成形する方法が一般に用いられて
いる。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding device for disc-shaped recording media (hereinafter referred to as discs) such as audio records and video discs, and is particularly characterized by the means for molding the center hole of the disc during disc molding. It is something that you have. Conventionally, as a method for forming the center hole of a disk, the disk molding device uses a mold clamping device and a pair of disk molding molds to directly supply disk material from the center of the disk molding mold using a mold clamping device and a pair of disc molding molds. During the compression molding process in which disk material is injected between two molds set to face each other, a movable center pin for forming a center hole is set to face the center of the mold for disc molding and is driven by another means. Generally, a method is used in which a fixed center pin is brought into pressure contact with the disk before forming the disk recording section to first form the disk center hole and then to form the recording section.
本発明は、このように別の駆動手段等を必要と
することなくデイスクの中心孔を形成する成形装
置を提供するものであり、以下縦型射出圧縮成形
機に本発明を適用した場合の一実施例をあげ説明
する。 The present invention provides a molding device that forms the center hole of a disk without the need for a separate drive means, and the following is an example of the case where the present invention is applied to a vertical injection compression molding machine. An example will be given and explained.
第１図はその外観を示すもので、１は下部固定
盤、２は上部固定盤でこの両者はタイパー３，
３′により連結されている。４は可動盤であり、
前記タイパー３，３′に摺動自在に挿通して設け
られ、かつこの可動盤４は前記下部固定盤１内に
設けられたラム５とシリンダ６から成る型締め機
構により上記固定盤１，２の間を上下動するよう
になつている。７は前記可動盤４に固定されたデ
イスク成形用の下金型、８は上部固定盤２に固定
された上金型である。この金型７及び８は前記型
締め機構と図示しない油圧制御回路から成る第一
の駆動手段により、第１図に示される両者の間隔
が開いたデイスク取出位置と、第２図に示す材料
射出時の微少間隔で開いている位置と、図示しな
いが両者が圧接された型締め位置の３位置に制御
される。 Figure 1 shows its external appearance. 1 is the lower fixed plate, 2 is the upper fixed plate, and both are the typer 3,
3'. 4 is a movable plate;
The movable platen 4 is slidably inserted into the tiepers 3 and 3', and the movable platen 4 is connected to the fixed plates 1 and 2 by a mold clamping mechanism consisting of a ram 5 and a cylinder 6 provided in the lower fixed platen 1. It is designed to move up and down between the two. Reference numeral 7 denotes a lower mold for forming a disk fixed to the movable platen 4, and 8 denotes an upper mold fixed to the upper fixed platen 2. The molds 7 and 8 are moved by a first drive means consisting of the mold clamping mechanism and a hydraulic control circuit (not shown) to the disk ejection position shown in FIG. 1 with a gap between them and the material injection position shown in FIG. They are controlled to three positions: a position in which they are opened at a minute interval, and a clamping position in which they are pressed together (not shown).
尚、デイスク取出し位置から微少間隔開き位置
まで下金型７を上昇する手段は通常行なわれてい
る補助シリンダで高速度で上昇させる構成にする
ことにより、成形時間を短かくすることが出来
る。９，９′は上部固定盤２の下部両側に垂直に
植設された一対の互に平行なガイドシヤフトで、
その上端を支持部材１０により一体的に連結して
あり、射出シリンダ１１の上下移動のためのガイ
ド部材になつている。またこのガイドシヤフト
９，９′には油圧により作動する移動シリンダ１
２，１２′が摺動自在に装着され、この移動シリ
ンダ１２，１２′には前記射出シリンダ１１の保
持部材１３が固着され、この移動シリンダ１２，
１２′は前記保持部材１３をガイドシヤフト９，
９′に沿つて上下移動させるための摺動機構を兼
ねた第２の手段を構成している。１４はホツパー
で前記保持部材１３を介して射出シリンダ１１に
デイスク成形材料を供給するようになつている。 The molding time can be shortened by using a commonly used auxiliary cylinder to raise the lower mold 7 from the disk take-out position to the slightly spaced position at high speed. 9 and 9' are a pair of mutually parallel guide shafts installed vertically on both sides of the lower part of the upper fixed platen 2;
Its upper end is integrally connected by a support member 10, and serves as a guide member for vertical movement of the injection cylinder 11. In addition, the guide shafts 9, 9' are equipped with hydraulically operated moving cylinders 1.
2 and 12' are slidably attached to the movable cylinders 12 and 12', and the holding member 13 of the injection cylinder 11 is fixed to the movable cylinders 12 and 12'.
12' connects the holding member 13 to the guide shaft 9,
9' constitutes a second means that also serves as a sliding mechanism for vertical movement. A hopper 14 is adapted to supply disk molding material to the injection cylinder 11 via the holding member 13.
第２図、第３図、第４図は部分拡大断面図であ
る。上下移動可能な射出シリンダー１１内にはス
クリユー１５と熔融した材料１６が満されてい
る。シリンダー１１の先端にはノズル１７が具備
されており、また、上金型センター金具１８でも
つて上金型８の表面中心部に上スタンパー２０を
固定し金型裏面より上金型止矢２６で止めてあ
る。そして、上金型センター金具１８の上部中心
孔に前記ノズル１７の先端が圧接されるよう構成
されている。一方下金型７には上金型センター金
具１９で下スタンパー２１を固定し金型裏面より
上金型止矢２５で止めてある。 FIGS. 2, 3, and 4 are partially enlarged sectional views. A vertically movable injection cylinder 11 is filled with a screw 15 and a molten material 16. A nozzle 17 is provided at the tip of the cylinder 11, and an upper stamper 20 is fixed to the center of the surface of the upper mold 8 using an upper mold center metal fitting 18, and an upper mold stopper arrow 26 is used to secure the upper stamper 20 from the back of the mold. It's stopped. The tip of the nozzle 17 is configured to be pressed into contact with the upper center hole of the upper mold center fitting 18. On the other hand, a lower stamper 21 is fixed to the lower mold 7 with an upper mold center fitting 19, and is stopped with an upper mold stopper arrow 25 from the back side of the mold.
また、第３図に最も明瞭に示されているよう
に、上金型センター金型１８の下面には、デイス
ク材料が円滑に流れるように、ノズル先端孔３１
より少し太めの下広がりの円錐状のデイスク材料
流出通路１８ａが設けられ、その流出通路１８ａ
の端部は、円筒状の凹部２７に連通しており、前
記流出通路１８ａの凹部２７との連通部の外周に
は若干の平担面部２９が形成されている。 As shown most clearly in FIG. 3, a nozzle tip hole 31 is provided on the lower surface of the upper mold center mold 18 to allow the disc material to flow smoothly.
A slightly thicker conical disk material outflow passage 18a that widens downward is provided, and the outflow passage 18a
The end portion thereof communicates with a cylindrical recess 27, and a slight flat surface portion 29 is formed on the outer periphery of the communication portion of the outflow passage 18a with the recess 27.
一方、下金型センター金具１９に設けられた円
柱状突起２４は前記上金型センター金具１８の凹
部２７に嵌込み寸法で挿入されるよう構成されて
おり、かつ、この円柱状突起２４は前記凹部２７
を形成する材料より高硬度のもので形成され、長
期間の使用にも摩滅しないように配慮されてい
る。 On the other hand, the cylindrical projection 24 provided on the lower mold center fitting 19 is configured to be inserted into the recess 27 of the upper mold center fitting 18 with a fitting dimension, and this cylindrical projection 24 is inserted into the recess 27 of the upper mold center fitting 18. Recess 27
It is made of a material that is harder than the material that makes it, and is designed to avoid wear and tear even after long-term use.
デイスク材料は射出シリンダー１１で電気ヒー
ター又は他の加熱方法で熔融されスクリユー１５
で前方に送られ熔融材料状態になる。一方、上金
型８と下金型７に取り付られた両スタンパー２
０，２１の表面は、それぞれの金型の加熱冷却溝
２２，２３に蒸気が通されて高温加熱の状態であ
る。熔融材料１６はスクリユー１５の前進運動に
より、ノズル先端孔３１より上型センター凹部２
７を通じて対向している下金型の下スタンパー２
１上と上金型の上スタンパー２０間（約数ミリ）
の間に、第２図に示すように一定量射出される。
そして、次に第４図のように下金型７が型締圧縮
されて、下金型センター金具１９の突起部２４が
射出された材料１６がスタンパー２０，２１の外
周方向に流れる途中で、熔融材料内圧の影響を受
ける事なく、上金型センター金具１８の上金型セ
ンター凹部２７に嵌合される。この第４図の状態
より両金型の型締圧縮が進むと突起部２４の先端
上面３０が、上金型センター凹部の微少フラツト
部２９を圧接するまで突起部２４は凹部２７内に
進入し、突起部２４上の熔融材料は押圧されてノ
ズル先端孔３１方向に逆流される。又上金型セン
ター凹部２７の内径と下金型７の突起部２４の外
径とは嵌合寸法の為、パンチ機構として作用して
デイスク中心孔の直径は突起部の外径の孔にな
り、この隙間の微量材料は食い切られて、デイス
ク外周部が成形されるまでにデイスク中心孔が成
形され、さらに前記可動盤４が上昇してデイスク
外周部が成形される。しかる後に、前記の上金型
８と下金型７のそれぞれの加熱冷却溝２２，２３
に冷却水を送水して両スタンパー２０，２１間の
デイスク材料はデイスク中心孔と共にデイスク外
周部も冷却され硬化して、デイスクが成形され
る。 The disk material is melted by an electric heater or other heating method in the injection cylinder 11 and then transferred to the screw 15.
The material is sent forward and becomes a molten material. On the other hand, both stampers 2 attached to the upper mold 8 and the lower mold 7
The surfaces of Nos. 0 and 21 are heated to a high temperature by passing steam through the heating and cooling grooves 22 and 23 of the respective molds. Due to the forward movement of the screw 15, the molten material 16 flows through the nozzle tip hole 31 into the upper mold center recess 2.
Lower stamper 2 of the lower mold facing through 7
Between the top 1 and the top stamper 20 of the top mold (about a few millimeters)
During this time, a certain amount is injected as shown in FIG.
Then, as shown in FIG. 4, the lower mold 7 is clamped and compressed, and while the material 16 injected from the protrusion 24 of the lower mold center fitting 19 flows toward the outer periphery of the stampers 20 and 21, It is fitted into the upper mold center recess 27 of the upper mold center fitting 18 without being affected by the internal pressure of the molten material. As mold clamping compression of both molds progresses from the state shown in FIG. 4, the projection 24 advances into the recess 27 until the top surface 30 of the tip of the projection 24 comes into pressure contact with the minute flat part 29 of the upper mold center recess. The molten material on the protrusion 24 is pressed and flows back toward the nozzle tip hole 31. Also, since the inner diameter of the upper mold center recess 27 and the outer diameter of the protrusion 24 of the lower mold 7 are dimensioned to fit, it acts as a punch mechanism, and the diameter of the disk center hole becomes the outer diameter of the protrusion. The small amount of material in this gap is cut off to form the center hole of the disk by the time the outer circumferential portion of the disk is formed, and the movable platen 4 is further raised to form the outer circumferential portion of the disk. After that, the heating and cooling grooves 22 and 23 of the upper mold 8 and the lower mold 7 are
Cooling water is supplied to cool and harden the disc material between the two stampers 20 and 21, as well as the disc center hole and the disc outer periphery, thereby molding the disc.
本発明の効果に付いてまとめると次のようにな
る。 The effects of the present invention can be summarized as follows.
(1) デイスク成形に当り、デイスク中心孔成形専
用可動式センターピンを別手段で、加圧、圧縮
することなく、主ラム上昇過程で、可動盤側金
型中心部の凸型固定センターピン上のデイスク
材料を押圧し、ノズル側に逆流しながらデイス
ク材料供給側金型センター凹型部に嵌合して、
デイスク中心孔を成形するため、デイスク中心
孔成形専用の複雑高価なる油圧制御等の加圧圧
縮手段を要せず簡単な装置でデイスクとデイス
ク中心孔を同時に成形出来る。特に比較的大孔
径を要するビデイオデイスク等の中心孔成形は
簡単な構造で安価に製造出来るにもかかわらず
精密に大孔径の中心孔成形が出来る為効果は多
大である。(1) When forming the disk, a movable center pin dedicated to forming the center hole of the disk is moved onto the convex fixed center pin in the center of the mold on the movable platen side during the main ram rising process without applying pressure or compression. The disc material is pressed, and while flowing back to the nozzle side, it fits into the concave part of the mold center on the disc material supply side.
In order to form the disk center hole, the disk and the disk center hole can be formed simultaneously with a simple device without requiring complicated and expensive pressure compression means such as hydraulic control dedicated to forming the disk center hole. Particularly in the case of forming the center hole of a video disc or the like which requires a relatively large hole diameter, the effect is great because the center hole of a large hole can be precisely formed even though it has a simple structure and can be manufactured at low cost.
(2) デイスク中心孔は金型センター金具凸型固定
ピンの外径で、デイスク中心孔内径が成形さ
れ、この時１本の凸型固定ピンでデイスクの裏
表両面貫通した中心孔が形成されるため、デイ
スク中心孔内面にバリが残らず、中心孔内面の
精密成形が出来る。(2) The inner diameter of the disk center hole is formed by the outer diameter of the mold center fitting convex fixing pin, and at this time, one convex fixing pin forms a center hole that penetrates both the front and back sides of the disk. Therefore, no burrs remain on the inner surface of the disk center hole, allowing precision molding of the inner surface of the center hole.
第１図は縦型射出圧縮成形幾の一例を示す正面
図、第２図、第３図および第４図はそれぞれ本発
明の一実施例における成形機の要部断面図であ
る。
１……下部固定盤、２……上部固定盤、３……
タイバー、４……可動盤、５……ラム、６……シ
リンダー、７……下金型、８……上金型、９……
ガイドシヤフト、１０……支持部材、１１……射
出シリンダー、１２……移動シリンダー、１３…
…保持部材、１４……ホツパー、１５……スクリ
ユー、１６……熔融材料、１７……ノズル、１８
……上金型センター金具、１９……下金型センタ
ー金具、２０……上スタンパー、２１……下スタ
ンパー、２２……上金型加熱冷却溝、２３……下
金型加熱冷却溝、２４……凸部固定センターピン
部、２５……下金型止矢、２６……上金型止矢、
２７……上金型センター凹部、２９……微少フラ
ツト部、３０……センターピン先端上面外周、３
１……ノズル先端孔、３２……センター凹部内
径、３３……凸型固定センターピン部外径。
FIG. 1 is a front view showing an example of a vertical injection compression molding machine, and FIGS. 2, 3, and 4 are sectional views of essential parts of a molding machine according to an embodiment of the present invention. 1... Lower fixed plate, 2... Upper fixed plate, 3...
Tie bar, 4...Movable plate, 5...Ram, 6...Cylinder, 7...Lower mold, 8...Upper mold, 9...
Guide shaft, 10... Support member, 11... Injection cylinder, 12... Moving cylinder, 13...
...Holding member, 14...Hopper, 15...Screw, 16...Melting material, 17...Nozzle, 18
...Upper mold center fitting, 19...Lower mold center fitting, 20...Upper stamper, 21...Lower stamper, 22...Upper mold heating and cooling groove, 23...Lower mold heating and cooling groove, 24 ...Protrusion fixing center pin part, 25...Lower mold stopper, 26...Upper mold stopper,
27...Upper mold center recess, 29...Minute flat part, 30...Center pin tip top surface outer periphery, 3
1...Nozzle tip hole, 32...Inner diameter of center recess, 33...Outer diameter of convex fixed center pin.
Claims (1)
の成形金型と、その一方の成形金型の中心部に一
体に設けられたデイスク中心孔形成用の円柱状突
起と、他方の成形金型の中心部に一体に設けられ
前記円柱状突起に丁度嵌合する円筒状凹部と、そ
の円筒状凹部に連通して設けられたデイスク成形
材料の供給孔と、その供給孔と前記円筒状凹部を
通してデイスク成形材料を前記両金型間に射出ま
たは押出す手段とを有することを特徴とする円盤
状記録媒体の成形装置。 ２ 供給孔は円筒状凹部に近接するほどその断面
積が大なるよう構成されていることを特徴とする
特許請求の範囲第１項に記載の円盤状記録媒体の
成形装置。[Claims] 1. A mold clamping device, a pair of molding molds provided in the mold clamping device, and a cylindrical shape for forming a disk center hole integrally provided in the center of one of the molding molds. a projection, a cylindrical recess that is integrally provided in the center of the other molding die and exactly fits into the cylindrical projection, a supply hole for disk molding material that is provided in communication with the cylindrical recess; A molding apparatus for a disc-shaped recording medium, comprising a supply hole and means for injecting or extruding a disc molding material between the two molds through the cylindrical recess. 2. The disk-shaped recording medium forming apparatus according to claim 1, wherein the supply hole is configured such that its cross-sectional area increases as it approaches the cylindrical recess.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6142982A JPS58177325A (en) | 1982-04-12 | 1982-04-12 | Apparatus for molding disk-like recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6142982A JPS58177325A (en) | 1982-04-12 | 1982-04-12 | Apparatus for molding disk-like recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58177325A JPS58177325A (en) | 1983-10-18 |
| JPS6328004B2 true JPS6328004B2 (en) | 1988-06-07 |
Family
ID=13170811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6142982A Granted JPS58177325A (en) | 1982-04-12 | 1982-04-12 | Apparatus for molding disk-like recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58177325A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4828769A (en) * | 1986-05-05 | 1989-05-09 | Galic/Maus Ventures | Method for injection molding articles |
| JP6012804B1 (en) | 2015-03-31 | 2016-10-25 | 東洋製罐株式会社 | Can body |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55152028A (en) * | 1979-05-15 | 1980-11-27 | Matsushita Electric Ind Co Ltd | Reproduction of information recorded carrier |
| JPS5751429A (en) * | 1980-07-30 | 1982-03-26 | Polygram Gmbh | Manufacture of discoid information carrier which can be read optically |
-
1982
- 1982-04-12 JP JP6142982A patent/JPS58177325A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55152028A (en) * | 1979-05-15 | 1980-11-27 | Matsushita Electric Ind Co Ltd | Reproduction of information recorded carrier |
| JPS5751429A (en) * | 1980-07-30 | 1982-03-26 | Polygram Gmbh | Manufacture of discoid information carrier which can be read optically |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58177325A (en) | 1983-10-18 |
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