JPS6154055A - Optical disc - Google Patents
Optical discInfo
- Publication number
- JPS6154055A JPS6154055A JP59176261A JP17626184A JPS6154055A JP S6154055 A JPS6154055 A JP S6154055A JP 59176261 A JP59176261 A JP 59176261A JP 17626184 A JP17626184 A JP 17626184A JP S6154055 A JPS6154055 A JP S6154055A
- Authority
- JP
- Japan
- Prior art keywords
- optical disc
- information recording
- pair
- substrates
- fitting
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
-
- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
- B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
- B29C65/7805—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features
- B29C65/7808—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features in the form of holes or slots
- B29C65/7811—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features in the form of holes or slots for centring purposes
-
- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
-
- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/45—Joining of substantially the whole surface of the articles
- B29C66/452—Joining of substantially the whole surface of the articles the article having a disc form, e.g. making CDs or DVDs
-
- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2017/00—Carriers for sound or information
- B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
- B29L2017/003—Records or discs
- B29L2017/005—CD''s, DVD''s
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
（発明の技術分野）
本発明は片面を情報記録面とした一対の光ディスク基板
を、上記情報記録面を相対向させて貼合せて構成される
両面再生可能な光ディスクに関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a double-sided playable optical disc constructed by laminating a pair of optical disc substrates each having an information recording surface on one side with the information recording surfaces facing each other. .
ビデオ・ディスク、コンパクト・ディスク、ディスク・
メモリ等の光ディスク基板は、一般にアクリル樹脂やポ
リカーボネート等の熱可塑性樹脂を射出成形して作られ
る。このようにして作られる光ディスク基板は、情報パ
ターンの転写性、基板の透明性とその耐熱性に優れ、ま
た吸水性および複屈折性が低い等の光ディスクとして優
れた特徴を有している。video disc, compact disc, disc
Optical disk substrates such as memories are generally made by injection molding thermoplastic resin such as acrylic resin or polycarbonate. The optical disk substrate produced in this manner has excellent characteristics as an optical disk, such as excellent transferability of information patterns, substrate transparency, and its heat resistance, and low water absorption and birefringence.
ところで片面再生型の光ディスクは、一般に第４図に示
すように片面に情報パターンを凹凸記録した基板１の上
記情報記録面に金属瓦１−１１！２を蒸着またはスパッ
タリングして形成し、その上に有灘質の保護１１３を塗
布形成したものとなっている。By the way, as shown in FIG. 4, a single-sided playback type optical disc is generally formed by depositing or sputtering a metal tile 1-11!2 on the information recording surface of a substrate 1 on which an information pattern is recorded in a concave-convex manner on one side. A protective layer 113 made of nada is coated on the surface.
また両面再生型の光ディスクは、第５図に示すように上
述した片面再生型の２つの光ディスクを一対とし、これ
らの一対の光ディスクの情報記録面を相対向させてホッ
トメルト接着剤４を用いて貼合せた構造を有している。Further, as shown in FIG. 5, a double-sided playback type optical disc is a pair of the above-mentioned single-sided playback type optical discs, and the information recording surfaces of the pair of optical discs are made to face each other using hot melt adhesive 4. It has a laminated structure.
このような両面再生型の光ディスクによれば、その情報
記録領域が倍増し、またその情報記録面を２つの基板１
の間に挟み込んだ対称構造となるので、環境の温度・湿
度の変化に起因する経時的な変形を防止できる等の実用
的な効果が大きい。According to such a double-sided playback type optical disc, the information recording area is doubled, and the information recording surface is divided into two substrates.
Since it has a symmetrical structure sandwiched between the two, it has great practical effects such as being able to prevent deformation over time due to changes in environmental temperature and humidity.
ところがこのようにして片面を情報記録面とした光ディ
スク基板（片面再生型光ディスク）を相互に貼合せて両
面再生型の光ディスクを製作するに際しては、上記２つ
のデイク基板の相互の貼合せ位置を正確に定めて、その
回転中心を一致させることが必要である。そこで従来で
は、位置合せ用の治具を用いたり、或いは位置合せ装置
を用いて上記２つの光ディスク基板を位置合せしたのち
、その接着接合を行っている。然し乍ら、その接着剤が
硬化して上記２つの光ディスク基板の接合が完了するま
で、上記基板間に位置ずれが生じないように上記２つの
光ディスク基板を前記冶具または位置合せ装置に取付け
たままにしておくことが必要であり、作業効率が非常に
悪かった。し／）１も、その接着面からはみ出した接着
剤によって前記治具や位置合せ装置の位置決め部が汚れ
易く、その繰返し使用に問題があった。However, when manufacturing a double-sided optical disc by laminating optical disc substrates with one side as an information recording surface (single-sided optical disc) to each other in this way, it is necessary to accurately align the mutual bonding positions of the two disc substrates. It is necessary to set the rotation center to coincide with the center of rotation. Conventionally, therefore, the two optical disk substrates are aligned using an alignment jig or an alignment device, and then adhesively bonded. However, until the adhesive hardens and the bonding of the two optical disk substrates is completed, the two optical disk substrates are left attached to the jig or alignment device to prevent positional deviation between the substrates. This meant that work efficiency was very poor. 1 also had a problem in repeated use because the jig and the positioning part of the positioning device were easily soiled by the adhesive protruding from the adhesive surface.
また前記２つの光ディスク基板を貼合せるに際して、そ
の間にスペーサを設けた構造の光ディスクも開発されて
いる。そして、このスペーサ自体に位置合せ礪能を持た
せることも考えられているが、その構造が複雑化する上
、位置決めすべき要素が増えるので十分高い精度の位置
合せが困難になる等の不具合があった。Furthermore, an optical disc having a structure in which a spacer is provided between the two optical disc substrates when bonding them together has also been developed. It has also been considered to provide the spacer itself with alignment capability, but this would complicate its structure and increase the number of elements to be positioned, resulting in problems such as difficulty in aligning with sufficient precision. there were.
本発明はこのような事情を考慮してなされたもので、そ
の目的とするところは、２枚の光ディスク基板を相互に
位置精度良く、簡易に貼合せることのできる実用性の高
い構造の光ディスクを提供することにある。The present invention has been made in consideration of these circumstances, and its purpose is to provide an optical disc with a highly practical structure that allows two optical disc substrates to be easily bonded to each other with good positional accuracy. It is about providing.
本発明は片面を情報記録面とした一対の光ディスク基板
を、上記情報記録面を相対向させて貼合せて構成される
両面再生可能な光ディスクにおいて、上記一対の光ディ
スク基板の前記情報記録面の情報記録領域を除く位置、
例えば情報記録領域の内周側の位置に、前記一対の光デ
ィスク基板間で相互に嵌合してその貼合せ位置を規定す
る嵌合部を、例えば一方の光ディスク基板に設けられた
凸部と、この凸部に嵌合する他方の光ディスク基板に設
けられた凹部としてそれぞれ設け、これらの嵌合部を相
互に嵌合してその位置合せを行って前記一対の光ディス
ク基板を貼合せてなることを特徴とするものである。The present invention provides a double-sided playable optical disc constructed by laminating a pair of optical disc substrates each having an information recording surface on one side with the information recording surfaces facing each other, wherein information on the information recording surface of the pair of optical disc substrates is provided. Location excluding recording area,
For example, a convex portion provided on one of the optical disk substrates is provided at a position on the inner circumferential side of the information recording area, and a fitting portion that fits together between the pair of optical disk substrates to define the bonding position thereof; The above-mentioned pair of optical disc substrates are bonded together by providing recesses in the other optical disk substrate that fit into the convex portions, and by fitting these fitting portions into each other and aligning them. This is a characteristic feature.
かくして本発明によれば、一対の光ディスク基板に設け
られた嵌合部によって上記一対の光ディスク基板自体が
それぞれ相互に高精度に位置決めされるので、従来のよ
うに位置決め用の冶具や位置合せ装置が不要となること
のみならず、貼合せ作業効率の向上を図ることが可能と
なる。またスペーサを用いて位置合せを行うものと異な
って、位置合せすべき要素が増えることもないので、位
置合せ精度が低下することもない。つまり一対の光ディ
スク基板が、自ら相互に高精度に位置合せを行った状態
で接合されるので、位置合せ精度を十分に満した両面再
生型の光ディスクが簡易に得られることになる。Thus, according to the present invention, the pair of optical disk substrates themselves are positioned with high precision with respect to each other by the fitting portions provided on the pair of optical disk substrates, so there is no need to use a positioning jig or alignment device as in the conventional case. Not only is this unnecessary, but it is also possible to improve the bonding work efficiency. Furthermore, unlike alignment using spacers, the number of elements to be aligned does not increase, so alignment accuracy does not deteriorate. In other words, since the pair of optical disk substrates are bonded together while being aligned with each other with high precision, it is possible to easily obtain a double-sided playback type optical disk that satisfies the alignment accuracy.
以下、図面を参照して本発明の実施例につき説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図は実施例に係る光ディスクの構造を示す要部断面
図である。一対の光ディスク基板５ａ、 ５ｂは、その
片面に凹凸パターンからなる情報を記録したものからな
り、基本的には第４図に示した片面再生型の光ディスク
と同様な構成を有している。FIG. 1 is a sectional view of a main part showing the structure of an optical disc according to an embodiment. The pair of optical disc substrates 5a and 5b have information recorded on one side in the form of a concave-convex pattern, and basically have the same structure as the single-sided playback type optical disc shown in FIG.
しかして上記光ディスク基板５ａの情報パターン形成面
のパターン形成領域（情報記録ｖＡ域）を除く領域、例
えばその内周側には位置合せ用の凸部６が形成されてお
り、またこの光ディスク基板５ａと対をなす前記光ディ
スク基板５ｂのパターン形成領域（情報記録領域）を除
く領域である内周側には、上記凸部６に嵌合する位置合
せ用の凹部７が形成されている。これらの凸部６および
凹部７からなる嵌合部の形成位置は、通常光ディスクの
情報記録領域がその半径方向の５０〜６０＃ＩＩＩ＋の
位置から始まることを考慮した場合、半径方向４０Ｍ以
内の位置とすることが望ましい。A convex portion 6 for positioning is formed in an area other than the pattern forming area (information recording vA area) of the information pattern forming surface of the optical disc substrate 5a, for example, on the inner circumferential side thereof, and this optical disc substrate 5a A recess 7 for positioning that fits into the projection 6 is formed on the inner circumferential side of the optical disc substrate 5b that is paired with the optical disc substrate 5b, excluding the pattern forming area (information recording area). Considering that the information recording area of an optical disc usually starts from a position of 50 to 60#III+ in the radial direction, the formation position of the fitting part consisting of the convex part 6 and the concave part 7 is a position within 40M in the radial direction. It is desirable to do so.
尚、上記凸部６および凹部７は、光ディスク基板５ａ、
５ｂの全周に亙って円環状に形成しても良いが、点状
に形成することも可能である。また第２図に示すように
所定位置から光ディスク基板５ａ。Incidentally, the convex portion 6 and the concave portion 7 are formed on the optical disc substrate 5a,
Although it may be formed in a ring shape over the entire circumference of 5b, it is also possible to form it in a dot shape. Further, as shown in FIG. 2, the optical disc substrate 5a is removed from a predetermined position.
５ｂの内周部の全てを段差状の凸部６および凹部７とす
ることも可能である。更には第３図＜ａ）（ｂ）にそれ
ぞれ示すような嵌合部形状としても良い。要は、相互に
嵌合してその嵌合位置を高精度に規定し得る形状の凹凸
からなる嵌合部構造であれば良い。It is also possible to make the entire inner circumferential portion of 5b into stepped convex portions 6 and concave portions 7. Furthermore, the fitting portions may have shapes as shown in FIGS. 3(a) and 3(b), respectively. In short, any fitting structure may be used as long as it is made up of concave and convex shapes that fit into each other and can define the fitting position with high precision.
しかして上記嵌合部の深さ、特に凹部７の深さは、光デ
ィスク基板５ａ、 ５ｂの厚みに直接的な関係を有し、
その厚みが一般に １．２〜１，５ ｍｔｔ＋程度で有
ることを考慮して０．１〜０．３ ａｍ程度に設定する
ことが望ましい。ちなみに、上記凹部７の深さを深くす
ると光ディスク基板５ａ、 ５ｂの射出成形時にその素
材である樹脂の流れを妨げて大きな応力歪を招来し易い
。そして、この応力歪に起因して、光ディスク基板５ａ
、 ５ｂの所謂そりや複屈折等の問題を招来する虞れが
ある。また上記凹部１の深さ、凸部６の高さが高いと、
つまりその段差が大きくなると前記一対の光ディスク基
板５ａ、 ５ｂを接合すべくその情報記録面側にロール
コータ−等を用いてホットメルト接着剤を塗布する際、
塗布むらを発生し易くなる。従って、これらのことを考
慮して前記凸部６および凹部１からなる嵌合部を設ける
ことが必要である。Therefore, the depth of the fitting portion, particularly the depth of the recess 7, has a direct relationship with the thickness of the optical disc substrates 5a, 5b.
Considering that the thickness is generally about 1.2 to 1.5 mtt+, it is desirable to set the thickness to about 0.1 to 0.3 am. Incidentally, if the depth of the recessed portion 7 is increased, the flow of the resin which is the material of the optical disc substrates 5a, 5b is likely to be hindered during injection molding, resulting in large stress and strain. Due to this stress strain, the optical disc substrate 5a
, 5b may cause problems such as so-called warpage and birefringence. Further, if the depth of the recess 1 and the height of the convex part 6 are high,
In other words, when the difference in level increases, when applying hot melt adhesive to the information recording surface side of the pair of optical disk substrates 5a and 5b using a roll coater or the like to join them together,
Uneven coating is likely to occur. Therefore, it is necessary to take these matters into consideration and provide a fitting portion consisting of the protrusion 6 and the recess 1.
かくしてこのような嵌合部（凸部６および凹部７）を備
えた一対の光ディスク基板５ａ、 ５ｂを接合するに際
しては、その嵌合部の嵌合によって上記一対の光ディス
ク基板５ａ、 ５ｂが自ら相互に高精度に位置決めされ
て接合されることになるので、位置決め用の冶具や位置
合せ装置等を用いることなしに位置決め精度の高い光デ
ィスクを簡易に得ることが可能となる。しかも上記一対
の光ディスク基板５ａ、 ５ｂが相互に位置決めしてい
るので、その接着剤が硬化するまで冶具等に保持してお
く必要がなく、作業効率の向上を図ることができる。か
くしてここに、位置合せ精度の高い簡易な構造の光ディ
スクを簡易に得ることができ、その実用的利点が絶大で
ある。Thus, when joining a pair of optical disk substrates 5a, 5b having such fitting portions (projections 6 and recesses 7), the pair of optical disk substrates 5a, 5b self-align with each other by the fitting of the fitting portions. Since the optical discs are positioned and bonded with high accuracy, it is possible to easily obtain an optical disk with high positioning accuracy without using a positioning jig or alignment device. Furthermore, since the pair of optical disk substrates 5a and 5b are positioned relative to each other, there is no need to hold them in a jig or the like until the adhesive is cured, and work efficiency can be improved. Thus, an optical disk with a simple structure and high alignment accuracy can be easily obtained, and its practical advantages are enormous.
尚、本発明は上述した実施例に限定されるものではない
。例えば光ディスク基板５ａ、 ５ｂの最外周部にその
嵌合部を設けるようにしても良い。また嵌合部形状、お
よびその大きさは光ディスクの仕様に応じて定めれば良
いものである。要するに本発明はその要旨を逸脱しない
範囲で種々変形して実施することができる。Note that the present invention is not limited to the embodiments described above. For example, the fitting portion may be provided at the outermost periphery of the optical disc substrates 5a, 5b. Further, the shape and size of the fitting portion may be determined according to the specifications of the optical disc. In short, the present invention can be implemented with various modifications without departing from the gist thereof.
第１図は本発明の一実施例に係る光ディスクの要部断面
構造を示す図、第２図および第３図（ａ）（ｂ）はそれ
ぞれ嵌合部形状の変形例を示す図、第４図は片面再生型
の光ディスク（光ディスク基板）の基本構造を示す図、
第５図は従来の両面再生型の光ディスクの構造を示す図
である。
１・・・基板、２・・・金属反射膜、３・・・保護膜、
４・−ホットメルト接着剤、５ａ、 ５ｂ・・・光ディ
スク基板、６・・・凸部（嵌合部）、１・・・凹部（嵌
合部）。
出願人代理人 弁理士 鈴江武彦
第１図
第２図FIG. 1 is a diagram showing a cross-sectional structure of a main part of an optical disc according to an embodiment of the present invention, FIGS. The figure shows the basic structure of a single-sided playback type optical disc (optical disc substrate).
FIG. 5 is a diagram showing the structure of a conventional double-sided playback type optical disc. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Metal reflective film, 3... Protective film,
4.-hot melt adhesive, 5a, 5b... optical disc substrate, 6... convex part (fitting part), 1... concave part (fitting part). Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2
Claims (1)
、上記情報記録面を相対向させて貼合せて構成される両
面再生可能な光ディスクにおいて、上記一対の光ディス
ク基板の前記情報記録面の情報記録領域を除く位置に、
前記一対の光ディスク基板間で相互に嵌合してその貼合
せ位置を規定する嵌合部をそれぞれ設けてなることを特
徴とする光ディスク。（２）嵌合部は、一方の光ディス
基板に設けられた凸部と、この凸部に嵌合する他方の光
ディスク基板に設けられた凹部とからなるものである特
許請求の範囲第１項記載の光ディスク。 （３）嵌合部は、一対の光ディスク基板の情報記録領域
の内周側にそれぞれ形成されるものである特許請求の範
囲第１項記載の光ディスク。[Scope of Claims] (1) A double-sided playable optical disc constructed by laminating a pair of optical disc substrates each having an information recording surface on one side with the information recording surfaces facing each other, wherein: At a position excluding the information recording area of the information recording surface,
An optical disc characterized in that the pair of optical disc substrates are each provided with a fitting portion that fits into each other to define a bonding position. (2) The fitting portion consists of a convex portion provided on one optical disk substrate and a concave portion provided on the other optical disk substrate that fits into the convex portion. The optical disc described. (3) The optical disc according to claim 1, wherein the fitting portions are formed on the inner peripheral sides of the information recording areas of the pair of optical disc substrates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59176261A JPS6154055A (en) | 1984-08-24 | 1984-08-24 | Optical disc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59176261A JPS6154055A (en) | 1984-08-24 | 1984-08-24 | Optical disc |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6154055A true JPS6154055A (en) | 1986-03-18 |
Family
ID=16010473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59176261A Pending JPS6154055A (en) | 1984-08-24 | 1984-08-24 | Optical disc |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6154055A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999026243A1 (en) * | 1997-11-18 | 1999-05-27 | Seagate Technology, Inc. | System and method of encoding for identifying a given surface among several identically patterned disk surfaces |
| WO1999040579A1 (en) * | 1998-02-09 | 1999-08-12 | Steag Hamatech Ag | Substrate disk |
-
1984
- 1984-08-24 JP JP59176261A patent/JPS6154055A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999026243A1 (en) * | 1997-11-18 | 1999-05-27 | Seagate Technology, Inc. | System and method of encoding for identifying a given surface among several identically patterned disk surfaces |
| US6018512A (en) * | 1997-11-18 | 2000-01-25 | Seagate Technology, Inc. | System and method of encoding for identifying a given surface among several identically patterned disk surfaces |
| WO1999040579A1 (en) * | 1998-02-09 | 1999-08-12 | Steag Hamatech Ag | Substrate disk |
| KR100385491B1 (en) * | 1998-02-09 | 2003-05-27 | 스티그 하마테크 악티엔게젤샤프트 | Substrate disk |
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