JPH0733035B2 - Molding equipment for disk-shaped moldings - Google Patents
Molding equipment for disk-shaped moldingsInfo
- Publication number
- JPH0733035B2 JPH0733035B2 JP1115874A JP11587489A JPH0733035B2 JP H0733035 B2 JPH0733035 B2 JP H0733035B2 JP 1115874 A JP1115874 A JP 1115874A JP 11587489 A JP11587489 A JP 11587489A JP H0733035 B2 JPH0733035 B2 JP H0733035B2
- Authority
- JP
- Japan
- Prior art keywords
- plate
- disk
- mold
- cooling
- shaped molded
- 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
- 238000000465 moulding Methods 0.000 title claims description 8
- 238000001816 cooling Methods 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 9
- 239000000110 cooling liquid Substances 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000000758 substrate Substances 0.000 description 10
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical group O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 5
- 238000003860 storage Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Manufacturing Optical Record Carriers (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、光ディスク基板に代表される円盤状の成形品
用の金型装置に関する。TECHNICAL FIELD The present invention relates to a mold device for a disk-shaped molded product represented by an optical disk substrate.
（従来の技術） 従来の光ディスク基板を成形する金型装置の基本的な構
造を第２図を参照して説明する。(Prior Art) The basic structure of a conventional mold device for molding an optical disk substrate will be described with reference to FIG.
固定金型101は図示しない固定側金型基板にねじで固定
されている。The fixed mold 101 is fixed to a fixed-side mold substrate (not shown) with screws.
同様に可動金型102も図示しない移動側金型基板に固定
されており、固定側金型基板と移動側金型基板はガイド
・ポストとガイド・ブッシュで開閉可能に連結されてい
る。Similarly, the movable mold 102 is also fixed to a moving-side mold substrate (not shown), and the fixed-side mold substrate and the moving-side mold substrate are openably and closably connected by a guide post and a guide bush.
固定金型101と可動金型102にはそれぞれ冷却液循環溝10
3,104およびＯリング溝105,106が設けられている。さら
に、固定金型101と可動金型102の中心部には貫通孔111,
113が設けられている。The fixed mold 101 and the movable mold 102 respectively have a cooling liquid circulation groove 10
3, 104 and O-ring grooves 105, 106 are provided. Furthermore, through holes 111, are formed in the center of the fixed mold 101 and the movable mold 102.
113 is provided.
スタンパプレート109は可動金型に、スタンパ押え120で
固定されている。The stamper plate 109 is fixed to the movable mold by a stamper retainer 120.
（発明が解決しようとする課題） 前述した従来の光ディスク基板を成形する金型装置にお
いて、成形キャビティを形成する金型にステンレス鋼を
使用して研き上げて表面に硬化処理を施して鏡面にする
という技術が用いられている。(Problems to be Solved by the Invention) In the above-described conventional mold apparatus for molding an optical disk substrate, stainless steel is used for a mold for forming a molding cavity, and the surface is hardened to be a mirror surface by hardening. Is used.
スタンパプレート109を頻繁に交換する必要がしばしば
あり、交換する際などにその鏡面を傷つけやすいという
問題がある。Since the stamper plate 109 needs to be frequently replaced, there is a problem in that the mirror surface is easily damaged when the stamper plate 109 is replaced.
僅かな傷がついてもそれがディスクの光学的な特性を損
なうので、作業者は細心の注意を払って作業をしてい
る。Workers work with extreme caution because even the slightest scratches impair the optical properties of the disc.
そこで型の材料としてより硬度の大きいアルミナセラミ
ックスを用いようとする提案がある。一般的にいって光
ディスクの表面は10nm程度の平面度が要求される。Therefore, there is a proposal to use alumina ceramics having a higher hardness as a mold material. Generally speaking, the surface of an optical disk is required to have a flatness of about 10 nm.
アルミナセラミックスは表面が粗く鏡面に加工し難いこ
と、また機械加工が困難であること、さらに割れやすい
という問題がある。Alumina ceramics has the problems that the surface is rough and it is difficult to process it into a mirror surface, that it is difficult to machine, and it is more susceptible to cracking.
型の内部には前述した冷却材の流路をはじめ、固定用の
ボルト孔、温度計測用のセンサを導く孔等が設けられて
おり、相当複雑な機械加工が必要である。In addition to the above-mentioned coolant flow path, a bolt hole for fixing, a hole for guiding a sensor for temperature measurement, and the like are provided inside the mold, which requires considerably complicated machining.
本発明の目的は、十分な硬度の表面を持つ鏡面盤と加工
性の容易な金属冷却部に分けることにより前述した問題
を総て解決した円盤状の成形品用の金型装置を提供する
ことにある。An object of the present invention is to provide a mold device for a disk-shaped molded product that solves all the above-mentioned problems by dividing it into a mirror surface plate having a surface of sufficient hardness and a metal cooling part that is easy to process. It is in.
（課題を解決するための手段） 前記目的を達成するために、本発明による円盤状の成形
品用の金型装置は、 固定側金型組立と可動側金型組立の対面するいずれか一
方の面に情報を転写するためのスタンパプレートを用い
た金型装置の前記固定側金型組立の中心の射出孔より溶
融樹脂を高圧でキャビティ内に射出充填して円盤状の成
形品を製造する円盤状の成形品用の金型装置において、 固定側および可動側金型組立の円盤キャビティ部材の少
なくとも一方を、 外径部分をテーパ面に加工した高い硬度の薄い鏡面盤
と、 比較的低い硬度の冷却盤と、 内径を前記薄い鏡面盤と同一テーパ面に加工し前記薄い
鏡面盤が圧入され前記冷却盤と結合する鋼リングと、 から構成されている。(Means for Solving the Problem) In order to achieve the above-mentioned object, a mold device for a disk-shaped molded product according to the present invention is provided with either a fixed-side mold assembly or a movable-side mold assembly facing each other. A disk for manufacturing a disk-shaped molded product by injecting and filling molten resin into the cavity at a high pressure through an injection hole at the center of the fixed side mold assembly of a mold device using a stamper plate for transferring information to the surface. At least one of the disk cavities of the fixed-side and movable-side mold assembly is a thin mirror surface plate with a high hardness and a taper surface on the outer diameter part, and a relatively low hardness. A cooling plate; and a steel ring having an inner diameter machined into the same tapered surface as the thin mirror plate and press-fitting the thin mirror plate to join the cooling plate.
前記鋼製リング部材の内径側に円形の段付孔部分を設
け、 前記孔部分に前記鏡面盤と同じ材質のリング部材を圧入
固定し、 スタンパプレート外周押さえリング部材とすることがで
きる。A circular stepped hole portion may be provided on the inner diameter side of the steel ring member, and a ring member made of the same material as the mirror surface plate may be press-fitted and fixed into the hole portion to form a stamper plate outer peripheral pressing ring member.
前記薄肉の鏡面盤に冷却液体が直接接触しながら流れる
ように、前記冷却盤面に同心円または渦巻き形の冷却液
体の流通路を形成することきができる。A concentric or spiral flow passage for the cooling liquid may be formed on the cooling plate surface so that the cooling liquid flows while being in direct contact with the thin mirror surface plate.
前記薄い鏡面盤は厚さ10mm程度で前記冷却円盤は厚さ20
mm以上とすることができる。The thin mirror surface plate has a thickness of about 10 mm, and the cooling disk has a thickness of 20 mm.
It can be more than mm.
前記鏡面盤の材質をジルコニア系セラミックまたはタン
グステン・カーバイド系超硬合金とし、その外径部分を
テーパ面に加工して、当該面に内径を同一テーパ面に加
工したステンレス鋼リングを圧入して複合一体化するこ
とができる。The material of the mirror surface plate is zirconia-based ceramic or tungsten carbide-based cemented carbide, the outer diameter part is processed into a tapered surface, and a stainless steel ring whose inner diameter is processed into the same tapered surface is press-fitted into the surface to form a composite. Can be integrated.
前記ステンレス鋼製リング部材の内径側に円形の段付き
孔部分を設けて、前記孔部分に前記鏡面盤と同じ材質の
リング部材を圧入して固定したスタンパプレート外周押
さえリング部材とすることができる。A circular stepped hole portion may be provided on the inner diameter side of the stainless steel ring member, and a ring member made of the same material as the mirror surface plate may be press-fitted and fixed into the hole portion to provide a stamper plate outer peripheral pressing ring member. .
（実施例） 以下、図面等を参照して本発明をさらに詳しく説明す
る。(Example) Hereinafter, the present invention will be described in more detail with reference to the drawings.
第１図は本発明による円盤状の成形品用の金型装置の実
施例を示す断面図である。FIG. 1 is a sectional view showing an embodiment of a die device for a disk-shaped molded product according to the present invention.
光ディスク基板に代表される円盤状の成形品用の金型装
置は通常固定側金型組立と移動側組立はガイド・ポスト
とガイド・ブッシュで連結されその間に成形用のキャビ
ティを形成する。In a mold device for a disk-shaped molded product typified by an optical disk substrate, a fixed side mold assembly and a movable side assembly are usually connected by a guide post and a guide bush to form a molding cavity therebetween.
第１図において、図示しない固定側基板に固定される固
定側冷却円盤1,鏡面盤7,鏡面盤押え15は固定側金型組立
に含まれる。In FIG. 1, the fixed side cooling disk 1, the mirror surface plate 7, and the mirror surface plate retainer 15 fixed to the fixed side substrate (not shown) are included in the fixed side mold assembly.
同様に図示しない移動側基板に固定される移動側金型2,
鏡面盤8,鏡面盤押え18,スタンパ上押えリング19,スタン
パ押え20は可動側金型組立に含まれる。Similarly, the moving side mold 2, which is fixed to the moving side substrate (not shown),
The mirror plate 8, the mirror plate retainer 18, the stamper upper retainer ring 19, and the stamper retainer 20 are included in the movable side mold assembly.
固定側冷却円盤１はステンレス鋼を加工したものでその
厚さは20〜35mm程度であり、５〜15mmの厚さの鏡面盤７
に冷却液体が直接接触しながら流れるように、鏡面盤７
に接する冷却盤１に同心円または渦巻き形の冷却液体の
流路溝３が設けられている。The fixed side cooling disk 1 is made of stainless steel and has a thickness of about 20 to 35 mm, and a mirror surface disk 7 with a thickness of 5 to 15 mm.
In order to allow the cooling liquid to flow directly to the mirror surface plate 7
The cooling plate 1 in contact with the cooling plate 1 is provided with concentric or spiral flow channels 3 for the cooling liquid.
そして前記流路溝３を囲うようにＯリング溝５が設けら
れている。An O-ring groove 5 is provided so as to surround the flow path groove 3.
同様に可動側冷却円盤２もステンレス鋼を加工したもの
でその厚さは20〜35mmで流路溝４とＯリング溝６が設け
られている。Similarly, the movable side cooling disk 2 is also made of stainless steel and has a thickness of 20 to 35 mm and a flow path groove 4 and an O-ring groove 6.
固定側冷却円盤１の中心にはスプールブッシュ収納孔1
1、可動側冷却円盤３の中心にはインナスタンパ押え収
納孔13が設けられている。The spool bush storage hole 1 is located at the center of the fixed side cooling disk 1.
1. An inner stamper holding hole 13 is provided at the center of the movable cooling disk 3.
ジルコニア系セラミックを用いた薄肉の鏡面盤7,8の外
径部分をテーパ面に加工して、当該面に内径を同一テー
パ面に加工して、当該面に内径を同一テーパ面に加工し
たステンレス鋼リング15,18を圧入して複合一体化して
冷却円盤1,2にそれぞれ固定する。The outer diameter of thin-walled mirror surface disk 7,8 using zirconia ceramic is processed into a tapered surface, the inside diameter is processed into the same tapered surface, and the inside diameter is processed into the same tapered surface in the surface. The steel rings 15 and 18 are press-fitted into a composite unit and fixed to the cooling disks 1 and 2, respectively.
前記薄肉の鏡面盤7,8の材質をタングステン・カーバイ
ト系超硬合金にすることもでき、その外径部分をテーパ
面に加工したステンレス鋼リング15,18を圧入して複合
一体化して冷却円盤1,2にそれぞれ固定する。The material of the thin mirror surface disks 7 and 8 can also be tungsten-carbide type cemented carbide, and the stainless steel rings 15 and 18 whose outer diameter parts are processed into tapered surfaces are press-fitted into a composite unit for cooling. Fix to disks 1 and 2, respectively.
スタンパプレート９は鏡面盤８の上面に乗せられて外周
はステンレス鋼リングのスタンパ押え20により、上面は
鏡面盤7,8と同じ材料のスタンパ上押えリング19で押さ
える。The stamper plate 9 is placed on the upper surface of the mirror surface disk 8, and the outer periphery is pressed by the stamper pressing member 20 made of a stainless steel ring, and the upper surface is pressed by the stamper upper pressing ring 19 made of the same material as the mirror surface disks 7, 8.
スタンパ上押えリング19は鏡面盤７の外周のテーパに対
応する内周のテーパ面を持ち、型締めされたときに成形
キャビティの外周面を形成している。The stamper upper pressing ring 19 has an inner peripheral tapered surface corresponding to the outer peripheral taper of the mirror surface plate 7 and forms the outer peripheral surface of the molding cavity when the mold is clamped.
（発明の効果） 以上詳しく説明したように、本発明による円盤状の成形
品用の金型装置は、 固定側金型組立と可動側金型組立の対面するいずれか一
方の面に情報を転写するためのスタンパプレートを用い
た金型装置の前記固定側金型組立の中心の射出孔より溶
融樹脂を高圧でキャビティ内に射出充填して円盤状の成
形品を製造する円盤状の成形品用の金型装置において、 固定側および可動側金型組立の円盤キャビティ部材の少
なくとも一方を、 外径部分をテーパ面に加工した高い硬度の薄い鏡面盤
と、 比較的低い硬度の冷却盤と、 内径を前記薄い鏡面盤と同一テーパ面に加工して前記薄
い鏡面盤が圧入され前記冷却盤と結合する鋼リングとか
ら構成されている。(Effects of the Invention) As described in detail above, in the mold device for a disk-shaped molded product according to the present invention, information is transferred to either one of the fixed mold assembly and the movable mold assembly that face each other. For a disk-shaped molded product, in which a molten resin is injected into the cavity at a high pressure through the injection hole at the center of the fixed side mold assembly of the mold device using a stamper plate for manufacturing a disk-shaped molded product In the mold device, at least one of the disk cavity members of the fixed side and movable side mold assembly has a thin mirror surface plate of high hardness with the outer diameter part processed into a tapered surface, a cooling plate of relatively low hardness, and an inner diameter Is machined into the same tapered surface as the thin mirror surface plate, and the thin mirror surface plate is press-fitted and is joined to the cooling plate.
このような構成によれば、冷却通路などの加工が必要で
ある冷却盤に加工が容易な比較的低い硬度の材料を用い
ることができる。With such a configuration, it is possible to use a material having a relatively low hardness, which is easy to process, for a cooling board that requires processing such as a cooling passage.
一方鏡面の形成以外には加工の必要のない鏡面盤として
十分の硬度を持つものを利用できることにより十分な硬
度の鏡面を利用できる。On the other hand, a mirror surface having a sufficient hardness can be used as a mirror surface plate that does not require processing other than the formation of the mirror surface, and thus a mirror surface having a sufficient hardness can be used.
前記鏡面盤の材質をジルコニア系セラミックとして十分
な硬度の均一性を保つことができる。It is possible to maintain sufficient hardness uniformity by using a zirconia-based ceramic as the material of the mirror surface plate.
またタングステン・カーバイト系超硬合金を研磨しても
十分な鏡面と硬度を持つ鏡面盤を形成することができ
る。Further, even if a tungsten carbide type cemented carbide is polished, a mirror surface plate having a sufficient mirror surface and hardness can be formed.
第１図は、本発明による円盤状の成形品用の金型装置の
実施例を示す断面図である。 第２図は、従来の円盤状の成形品用の金型装置の断面図
である。 １…固定側冷却円盤 ２…可動側冷却円盤 3,4…冷却液循環溝 5,6…Ｏリング溝 7,8…鏡面盤 ９…スタンパプレート 11…スプールブッシュ収納孔 13…インナスタンパ押え収納孔 15,18…鏡面盤押え 19…スタンパ上押えリング 20…スタンパ押え 101…固定金型 102…可動金型 103,104…冷却液循環溝 105,106…Ｏリング溝 109…スタンパプレート 111…スプールブッシュ収納孔 120…スタンパ押えFIG. 1 is a sectional view showing an embodiment of a die device for a disk-shaped molded product according to the present invention. FIG. 2 is a cross-sectional view of a conventional mold device for a disk-shaped molded product. 1 ... Fixed side cooling disk 2 ... Movable side cooling disk 3,4 ... Cooling liquid circulation groove 5,6 ... O-ring groove 7,8 ... Mirror surface disk 9 ... Stamper plate 11 ... Spool bush storage hole 13 ... Inner stamper presser storage hole 15,18… Mirror surface plate retainer 19… Stamper upper retainer ring 20… Stamper retainer 101… Fixed mold 102… Movable mold 103,104… Coolant circulation groove 105,106… O-ring groove 109… Stamper plate 111… Spool bush storage hole 120… Stamper foot
───────────────────────────────────────────────────── フロントページの続き (72)発明者 北村 武彦 東京都千代田区大手町２丁目２番１号 住 友重機械工業株式会社内 (56)参考文献 特開 昭62−181118（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takehiko Kitamura 2-2-1 Otemachi, Chiyoda-ku, Tokyo Sumitomo Heavy Industries, Ltd. (56) Reference JP-A-62-181118 (JP, A)
Claims (3)
るいずれか一方の面に情報を転写するためのスタンパプ
レートを用いた金型装置の前記固定側金型組立の中心の
射出孔より溶融樹脂を高圧でキャビティ内に射出充填し
て円盤状の成形品を製造する円盤状の成形品用の金型装
置において、 固定側および可動側金型組立の円盤キャビティ部材の少
なくとも一方を、 外径部分をテーパ面に加工した高い硬度の薄い鏡面盤
と、 比較的低い硬度の冷却盤と、 内径を前記薄い鏡面盤と同一テーパ面に加工し前記薄い
鏡面盤が圧入され前記冷却盤と結合する鋼リングと、 から構成したことを特徴とする円盤状の成形品用の金型
装置。1. An injection at the center of the fixed side mold assembly of a mold device using a stamper plate for transferring information to either one of the facing surface of the fixed side mold assembly and the movable side mold assembly. In a mold device for a disk-shaped molded product, in which molten resin is injected and filled at high pressure through a hole to manufacture a disk-shaped molded product, at least one of the disk cavity member of the fixed side and movable side mold assembly is , A high-hardness thin mirror plate with an outer diameter processed into a tapered surface, a cooling plate with a relatively low hardness, an inner diameter processed into the same tapered surface as the thin mirror plate, and the thin mirror plate is press-fitted into the cooling plate. A mold device for a disk-shaped molded product, which is characterized by comprising a steel ring that is coupled with
孔部分を設け、 前記孔部分に前記鏡面盤と同じ材質のリング部材を圧入
固定し、 スタンパプレート外周押さえリング部材とした請求項１
記載の円盤状の成形品用の金型装置。2. A stamper plate outer peripheral pressing ring member, wherein a circular stepped hole portion is provided on the inner diameter side of said steel ring member, and a ring member made of the same material as said mirror surface plate is press-fitted and fixed in said hole portion. Item 1
A mold device for the disc-shaped molded article described.
ながら流れるように、前記冷却盤面に同心円または渦巻
き形の冷却液体の流通路が形成されている請求項１記載
の円盤状の成形品用の金型装置。3. The disk-shaped molding according to claim 1, wherein concentric or spiral-shaped cooling liquid flow passages are formed in the cooling plate surface so that the cooling liquid flows while directly contacting the thin mirror surface plate. Mold equipment for goods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1115874A JPH0733035B2 (en) | 1989-05-09 | 1989-05-09 | Molding equipment for disk-shaped moldings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1115874A JPH0733035B2 (en) | 1989-05-09 | 1989-05-09 | Molding equipment for disk-shaped moldings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02295716A JPH02295716A (en) | 1990-12-06 |
| JPH0733035B2 true JPH0733035B2 (en) | 1995-04-12 |
Family
ID=14673301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1115874A Expired - Lifetime JPH0733035B2 (en) | 1989-05-09 | 1989-05-09 | Molding equipment for disk-shaped moldings |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0733035B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT410192B (en) * | 2000-05-17 | 2003-02-25 | Dovids Gerhard Ing | Mold for CD and DVD production by an injection molding process, comprises two halves, fitted with springs which push the halves apart when the closing force of the molding machine is released |
| JP4783826B2 (en) * | 2008-12-17 | 2011-09-28 | 有限会社吉村工業所 | Rebar welding jig |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6218118A (en) * | 1985-07-17 | 1987-01-27 | Matsushita Electric Ind Co Ltd | viterbi decoding device |
-
1989
- 1989-05-09 JP JP1115874A patent/JPH0733035B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02295716A (en) | 1990-12-06 |
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