JPH02156434A - Laminated disk - Google Patents
Laminated diskInfo
- Publication number
- JPH02156434A JPH02156434A JP63310116A JP31011688A JPH02156434A JP H02156434 A JPH02156434 A JP H02156434A JP 63310116 A JP63310116 A JP 63310116A JP 31011688 A JP31011688 A JP 31011688A JP H02156434 A JPH02156434 A JP H02156434A
- Authority
- JP
- Japan
- Prior art keywords
- disk
- information recording
- recording area
- bonded
- disks
- 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
- 230000002093 peripheral effect Effects 0.000 claims abstract description 19
- 239000003973 paint Substances 0.000 claims description 23
- 239000000853 adhesive Substances 0.000 abstract description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 abstract description 8
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 description 19
- 238000000034 method Methods 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 7
- 239000012790 adhesive layer Substances 0.000 description 6
- 206010040844 Skin exfoliation Diseases 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000012943 hotmelt Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、情報が記録されているディスクを２枚、その
情報再生面の裏側で接着した光学式ビデオディスクのよ
うな貼り合わせディスクの改良に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is an improvement of a bonded disc such as an optical video disc in which two discs on which information is recorded are glued together on the back side of the information playback surface. Regarding.
〔従来の技術］
従来の光学式ビデオディスクは、情報となるピットが形
成されている透明なＰＭＭＡの円盤の該ピット面に、ア
ルミニウムの光学反射膜を蒸着等で形成し、ピットの形
成されていない面からのレーザ光の入射によってピット
を読取り、その情報が再生されるようになっている。[Prior Art] Conventional optical video discs are produced by forming an optical reflective film of aluminum by vapor deposition on the pit surface of a transparent PMMA disk on which pits are formed, which serve as information. The pits are read by laser light incident from the opposite side, and the information is reproduced.
そして、光学式反射膜の上に、ホットメルトタイプの保
護膜及び接着剤をロールコータで塗布し、この接着面を
大気中で圧着して２枚のディスクを貼り合わされたもの
である。Then, a hot melt type protective film and an adhesive are applied onto the optical reflective film using a roll coater, and the adhesive surfaces are pressed together in the atmosphere to bond the two discs together.
〔発明が解決しようとする課題］
前述のロールコータで塗布された保護膜や接着剤の塗膜
は、ロール目と称する塗布口模様が厚みのムラによって
形成されてしまう。[Problems to be Solved by the Invention] In the protective film and adhesive coating coated with the above-mentioned roll coater, coating opening patterns called roll stitches are formed due to uneven thickness.
このホントメルトタイプの保護膜は、塗布直後の冷却に
よって固化し、貼り合わせの際の圧着力が大きいと、塗
布口模様の凹凸が反射膜近傍のＰＭＭＡのディスク基材
を変形させ、ピットをつぶしてしまったり、凹凸が基材
に現れたりして、情報の再生に悪影響を及ぼしてしまう
。This true-melt type protective film solidifies by cooling immediately after application, and if the pressure applied during bonding is large, the unevenness of the coating opening pattern will deform the PMMA disk base material near the reflective film, crushing the pits. Otherwise, unevenness may appear on the base material, which may adversely affect information reproduction.
そのため、現在は塗布口の出ない程度の力で圧着を行っ
ているが、この程度の弱い圧着力では、接着剤間に空隙
が増え、ディスクの接着力が低下し、長期の使用中に剥
離のおそれがあり、且つこの空隙を縫って空気や水分が
容易に拡散してしまう。For this reason, currently pressure is applied to the adhesive so that the application port does not come out, but such a weak pressure increases the amount of space between the adhesive, reduces the adhesive strength of the disc, and causes it to peel off during long-term use. There is a risk that air and moisture will easily diffuse through these gaps.
この拡散は、接着剤の加水分解等によって接着力の低下
を来し、長期的には剥離の危険性の増大につながる。This diffusion causes a decrease in adhesive strength due to hydrolysis of the adhesive, leading to an increased risk of peeling in the long term.
又、保護膜として水分の透過率の高いものが用いられた
り、ピンホールがあったりすると、拡散した水分はアル
ミニウムの反射膜を腐蝕して侵すという問題もある。Furthermore, if a protective film with high moisture permeability is used or if there are pinholes, there is a problem that the diffused moisture corrodes and invades the aluminum reflective film.
一方、特開昭６３−１６４０４３号公報記載の光ディス
クの形成方法では、真空中で２枚のディスクを情報記録
エリア以外の外周縁部で溶着する方法が述べられている
。On the other hand, a method for forming an optical disk described in Japanese Patent Application Laid-Open No. 63-164043 describes a method of welding two disks together at their outer peripheral edges outside the information recording area in a vacuum.
この方法は、水分等の拡散は低く抑えられるが、内外周
縁部以外は接着されておらず、ディスクが積層構造であ
るため、ディスク基材が吸湿した際に発生する反りに対
する抵抗が弱くなる。This method suppresses the diffusion of moisture, etc., but since the disk is not bonded except for the inner and outer peripheral edges and the disk has a laminated structure, resistance to warping that occurs when the disk base material absorbs moisture is weakened.
従って、高温、高温等の悪環境下、長期的にはディスク
に反りや変形、剥離が発生し易い欠点を有している。Therefore, under adverse environments such as high temperatures and high temperatures, the disk has the disadvantage of being susceptible to warping, deformation, and peeling over a long period of time.
本発明は、従来の貼り合わせディスクにおけるこのよう
な問題点を解決し、高温、高温等の悪影響下、長期的に
も剥離や反り、変形を生ぜず、アルミニウム反射膜腐蝕
のおそれのない耐久性に優れた貼り合わせディスクを提
供することを目的とする。The present invention solves these problems with conventional laminated discs, and provides durability that does not cause peeling, warping, or deformation even under the adverse effects of high temperatures, etc. over a long period of time, and does not cause corrosion of the aluminum reflective film. The purpose is to provide an excellent laminated disc.
本発明は、前述の目的を達成するための貼り合わせディ
スクの手段に関し、貼り合わされる２枚のディスクのう
ち、少なくとも一方のディスクの表裏面のいずれかには
、情報記録エリア外の外周部及び内周部に、表裏面より
僅かに高い文面を形成し、このディスクの情報記録面側
を他方のディスクの全面に接着したものである。The present invention relates to a bonded disk means for achieving the above-mentioned object, in which at least one of the two disks to be bonded has an outer periphery outside the information recording area and a A text slightly higher than the front and back surfaces is formed on the inner periphery, and the information recording surface side of this disk is adhered to the entire surface of the other disk.
そして、貼り合わされたディスクの外周端面に塗料膜を
形成することが望ましい。Then, it is desirable to form a paint film on the outer peripheral end surface of the bonded disks.
本発明の貼り合わせディスクは、少なくとも一方のディ
スクには、情報記録エリア外の内周面、外周面の表裏い
ずれかに、その面より僅かに高い文面が形成されている
ので、情報記録エリアを含む全面に接着剤を塗布して重
ね、加圧する際の圧力は、大部分をこの文面が受け、情
報記録エリアに強い圧力が加わることがない。In the laminated disc of the present invention, at least one of the discs has a text slightly higher than the inner circumferential surface outside the information recording area, or on the front or back of the outer circumferential surface, so that the information recording area can be Most of the pressure when applying adhesive to the entire surface and applying pressure is applied to this text, and strong pressure is not applied to the information recording area.
そのため、情報信号は接着剤の塗布口模様の凹凸によっ
て損傷されることがなく、情報信号エリア以外の部分に
は強い圧着力が加わるため、全面接着と相俟って、強固
に接着される。Therefore, the information signal is not damaged by the irregularities of the adhesive application opening pattern, and strong pressure is applied to areas other than the information signal area, which together with the entire surface adhesion results in strong adhesion.
更に、貼り合わされたディスクの外周端面には塗料膜が
形成されるので、貼り合わせの強圧ではみ出した接着剤
が塗料膜で隠蔽され、外周端面を揃える目的を含む外周
端面の切削の必要がなくなり、切削屑等による問題が除
去される。Furthermore, since a paint film is formed on the outer peripheral edge surface of the bonded disks, the adhesive that has protruded due to the strong pressure of bonding is covered up by the paint film, eliminating the need for cutting the outer peripheral edge surface, including for the purpose of aligning the outer peripheral edge surfaces. , problems caused by cutting debris, etc. are eliminated.
しかも、この塗料膜は、接着剤層内への水分等の浸入を
防止し、アルミニウム反射膜の腐蝕のおそれを無くすこ
ともできるものである。Furthermore, this paint film can prevent moisture from entering the adhesive layer and eliminate the risk of corrosion of the aluminum reflective film.
本発明の一実施例を、貼り合わせディスクである光学式
のビデオディスクの製造方法について、図面により以下
に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings regarding a method of manufacturing an optical video disc that is a laminated disc.
外径３００ａ＋ｍの光学式ビデオディスクの場合には、
中心孔径３５ｍｍのＰ Ｍ Ｍ Ａ等の合成樹脂の円盤
の一面に、内径約１０５ｍｍ、外径約２９５＋ｎｍの範
囲を情報記録エリアとなる。In the case of an optical video disc with an outer diameter of 300a+m,
On one side of a disk made of synthetic resin such as PMMA having a center hole diameter of 35 mm, an area with an inner diameter of about 105 mm and an outer diameter of about 295+ nm serves as an information recording area.
従って、第１図のように、ディスク１には、径３５鵬の
中心孔１ａが形成され、且つ情報記録エリア１ｂである
径１０５〜２９５ｍｍの部分にビットが形成されている
。Therefore, as shown in FIG. 1, a center hole 1a with a diameter of 35 mm is formed in the disk 1, and bits are formed in a portion with a diameter of 105 to 295 mm, which is the information recording area 1b.
このディスク１の情報記録エリア１ｂとは反対面、即ち
情報再生面には、情報記録エリア１ｂに相当する面１ｃ
よりも外側の外周部１ｄ、内周部ｌｅは、情報記録エリ
ア１ｂに相当する面１ｃよりも、０．０５〜０．１ｍｍ
高い突平面に形成する。On the opposite side of the disc 1 from the information recording area 1b, that is, on the information reproduction side, there is a surface 1c corresponding to the information recording area 1b.
The outer peripheral part 1d and the inner peripheral part le on the outside are 0.05 to 0.1 mm wider than the surface 1c corresponding to the information recording area 1b.
Form into a high protruding plane.
このディスク１の情報記録エリアｌｂ側の面にアルミニ
ウムを蒸着して、アルミニウムの光反射膜を形成した後
、第２図のように、ロールコータの転写ロール２によっ
て、光反射膜上に接着剤層３を形成する。After depositing aluminum on the surface of the disc 1 on the side of the information recording area lb to form an aluminum light-reflecting film, as shown in FIG. Form layer 3.
この接着剤の例としては、東亜合成化学工業株式会社製
のホットメルトタイプのＸＷ−３０が用いられ、３０〜
５０μｍの塗布厚さとする。As an example of this adhesive, hot melt type XW-30 manufactured by Toagosei Chemical Industry Co., Ltd. is used.
The coating thickness is 50 μm.
この塗布後の冷却によって、接着剤層３は刷毛目と称す
る塗布口模様が接着剤の固化によって生じてしまう。As a result of this cooling after application, the adhesive layer 3 has an application opening pattern called brush marks due to solidification of the adhesive.
このようにして、接着剤層３が形成されているディスク
ｌ、１′を２枚、真空槽４内の上型５と下型６とに取り
付け、真空ポンプ７によって真空槽４内を真空とした後
、上型５を下降してディスク１上にディスク１′を圧着
し、その接着剤層３を圧着して接着させる。In this way, the two disks l and 1' on which the adhesive layer 3 is formed are attached to the upper die 5 and the lower die 6 in the vacuum chamber 4, and the vacuum chamber 4 is evacuated by the vacuum pump 7. After that, the upper mold 5 is lowered to press the disk 1' onto the disk 1, and the adhesive layer 3 is pressed and bonded.
この圧着に際して、ディスク１，１′の外周部ｌｄ、及
び内周部１ｅは、情報記録エリア１ｂに相当する面１ｃ
よりも０．０５〜０．１ｍ高い突平面であるため、ディ
スク１，１′の外周部、内周部がこの圧着の力の大部分
を受けることとなる。During this pressure bonding, the outer circumferential portion ld and the inner circumferential portion 1e of the disks 1, 1' are attached to a surface 1c corresponding to the information recording area 1b.
Since the protruding plane is 0.05 to 0.1 m higher than that of the disk, the outer and inner circumferential portions of the disks 1 and 1' receive most of this pressure force.
これに対し、面ＩＣが受ける圧着力は弱くなるので、情
報記録エリア１ｂに対しては圧着力が弱くなり、ディス
ク基板に形成されているピットが接着剤層３の塗布口模
様の影響を受けることはない。On the other hand, since the pressure applied to the surface IC becomes weaker, the pressure applied to the information recording area 1b becomes weaker, and the pits formed on the disk substrate are affected by the application opening pattern of the adhesive layer 3. Never.
そして、外周部１ｄの接着剤層３は、その強圧によって
ディスクｌの外周にはみ出してしまう。Then, the adhesive layer 3 on the outer circumferential portion 1d protrudes to the outer circumference of the disk l due to the strong pressure.
このようにして貼り合わされたディスクＤは、第４図の
ように塗料膜形成装置に取り付けられ、矢印の方向に回
転される。The disks D thus pasted together are attached to a paint film forming device as shown in FIG. 4 and rotated in the direction of the arrow.
この塗料膜形成装置は、塗料槽８内の塗料９を回転して
いるくみ上げロール１０の周辺に付着させてくみ上げ、
これをくみ上げロール１０に近接して回転している転写
ロール１１に移行させ、転写ロール１１の周辺に塗料膜
を形成するが、その塗料膜の厚さは、転写ロール１１と
くみ上げロールｌＯとのすき間で調節される。This paint film forming device pumps up the paint 9 in the paint tank 8 by making it adhere to the periphery of the rotating pumping roll 10.
This is transferred to the transfer roll 11 rotating close to the pumping roll 10, and a paint film is formed around the transfer roll 11, but the thickness of the paint film is the same as that between the transfer roll 11 and the pumping roll lO. The gap is adjusted.
この転写ロール１１上の塗料膜は、これに接しているデ
ィスクＤの外周端面に移行して塗料膜を形成するもので
、塗料の一例としては東亜合成化学工業株式会社製の紫
外線硬化型のＵＶ−３５６４（粘度５００ｃｐｓ）が使
用される。The paint film on the transfer roll 11 transfers to the outer circumferential end surface of the disk D in contact with the transfer roll 11 to form a paint film. An example of the paint is an ultraviolet curing UV ray manufactured by Toagosei Chemical Co., Ltd. -3564 (viscosity 500 cps) is used.
そして、転写ロール１１上の塗料膜の厚さ１００〜２０
．０μｍ、周速度２０ｃｍ／ｓｅｃ 、ディスクＤを５
ｒｐｍで３回転転写ロール１１に接させ、その塗料膜
を貼り合わされたディスクＤの外周端面に転写する。The thickness of the paint film on the transfer roll 11 is 100 to 20
．． 0μm, peripheral speed 20cm/sec, disk D 5
It is brought into contact with a transfer roll 11 that rotates three times at a rotational speed of rpm, and the paint film is transferred to the outer peripheral end surface of the bonded disk D.
斯くして、第６図に示すディスクＤの周端面に形成され
た紫外線硬化型の塗料膜１４は、第５図のようにモータ
１２で回転されながら紫外線ランプ１３から紫外線を照
射されて硬化し、ディスクＤの周端面に硬化した塗料膜
１４を形成した第６図の貼り合わせディスクが得られる
。In this way, the ultraviolet curing paint film 14 formed on the peripheral end surface of the disk D shown in FIG. 6 is cured by being irradiated with ultraviolet light from the ultraviolet lamp 13 while being rotated by the motor 12 as shown in FIG. 6, in which a hardened paint film 14 is formed on the peripheral end surface of the disk D, is obtained.
この貼り合わせディスクは全面接着されているばかりで
なく、外周部１ｃ、内周部１ｄは強圧によって強固な接
着が行われるが、情報記録エリアは低いため弱圧である
ため、ピット等の情報が損傷されることはない。This laminated disk is not only fully bonded, but also the outer circumferential part 1c and inner circumferential part 1d are firmly bonded by strong pressure, but since the information recording area is low, the pressure is weak, so information such as pits is It cannot be damaged.
そして、外周端面の塗料膜は、外周端面の接着剤のはみ
出し、端面段差を隠蔽し、その切削仕上げを不要とする
ものである。The paint film on the outer circumferential end surface hides the extrusion of the adhesive on the outer circumferential end surface and the step on the end surface, making cutting and finishing unnecessary.
前記実施例のディスク１に形成する突平面は、情報記録
エリア１ｂとは反対側の情報再生面の外周面１ｄ、内周
面１ｅに形成したが、この突平面を第７図のように情報
記録エリアｌｂ側の、情報記録エリアｌｂ外の外周面１
ｆ、内周面１ｇに形成しても、前記実施例と同様な作用
効果が得られる。The protruding planes formed on the disc 1 of the embodiment described above were formed on the outer circumferential surface 1d and the inner circumferential surface 1e of the information reproducing surface on the opposite side from the information recording area 1b. Outer peripheral surface 1 outside the information recording area lb on the recording area lb side
f. Even if it is formed on the inner circumferential surface 1g, the same effects as in the embodiment described above can be obtained.
本発明は叙上のように、２枚のディスクを貼り合わせた
ディスクは、全面が均等に接着されているのではなく、
情報記録エリアを除く外周部と内周部は、その高さによ
る強圧による接着であるため、強固な接着が行われ、外
周端面の塗料膜と相俟って、接着の剥離や変形等がなく
、又内部への水分の浸入によるアルミニウムの光反射膜
の腐蝕も防止され、耐久性に優れたものとなる。As described above, the present invention is based on the fact that a disk made by bonding two disks together is not evenly bonded over the entire surface.
The outer and inner periphery areas, excluding the information recording area, are bonded using strong pressure due to their height, so strong adhesion is achieved, and together with the paint film on the outer periphery edge, there is no peeling or deformation of the adhesive. Furthermore, corrosion of the aluminum light-reflecting film due to moisture intrusion into the interior is also prevented, resulting in excellent durability.
そして、情報記録エリアは、その低さによって圧着の圧
力は弱められ、固化した接着剤の塗布口模様の凹凸によ
る情報記録エリアのピット等の情報の損傷が防止される
。Due to the low height of the information recording area, the compression pressure is weakened, and damage to information such as pits in the information recording area due to unevenness of the application opening pattern of the solidified adhesive is prevented.
しかも、外周端面の塗料膜によって、強圧ではみ出した
接着剤や端面の段差は覆われるので、外周端面の切削の
必要がなくなり、切り屑の付着やこれの除去作業に伴う
表面の傷の発生が未然に防止できるものである。Moreover, the paint film on the outer edge covers the adhesive that has protruded under high pressure and the steps on the edge, eliminating the need for cutting the outer edge and reducing the adhesion of chips and the occurrence of surface scratches due to removal work. It is something that can be prevented.
第１図〜第５図は本発明の貼り合わせディスクの一実施
例の製造工程を示し、
第１図は成型されたディスクの断面図、第２図は接着剤
塗布工程の側面図、
第３図は接着工程の側面図、
第４図は塗料膜形成工程の側面図、
第５図はその硬化工程の側面図、
第６図は本発明の一実施例の要部の断面図、第７図は成
型されたディスクの他の実施例の断面図である。
１．１′・・・ディスク、ｌｂ・・・情報記録エリア、
１ｃ・・・情報記録エリアｌｂに相当する反対面、１ｄ
、Ｉｆ・・・外周面、ｌｅ、Ｉｇ・・・内周面、３・・
・接着剤、５・・・上型、６・・・下型、１４・・・塗
料膜、Ｄ・・・貼り合わせディスク。1 to 5 show the manufacturing process of one embodiment of the bonded disk of the present invention, FIG. 1 is a cross-sectional view of the molded disk, FIG. 2 is a side view of the adhesive application process, and FIG. Figure 4 is a side view of the adhesion process, Figure 4 is a side view of the paint film forming process, Figure 5 is a side view of the curing process, Figure 6 is a sectional view of the main parts of an embodiment of the present invention, and Figure 7 is a side view of the adhesion process. The figure is a cross-sectional view of another embodiment of a molded disk. 1.1'...disc, lb...information recording area,
1c... Opposite surface corresponding to information recording area lb, 1d
, If...Outer peripheral surface, le, Ig... Inner peripheral surface, 3...
- Adhesive, 5... Upper mold, 6... Lower mold, 14... Paint film, D... Bonded disk.
Claims (2)
も一方のディスクの表裏面のいずれかには、情報記録エ
リア外の外周部及び内周部に、表裏面より僅かに高い突
面を形成し、このディスクの情報記録面側を他方のディ
スクに接着して形成したことを特徴とする貼り合わせデ
ィスク。(1) Of the two disks to be bonded together, at least one of the disks has a protruding surface slightly higher than the front and back surfaces on the outer and inner peripheries outside the information recording area. , a bonded disk characterized in that the information recording side of the disk is bonded to another disk.
膜を形成したことを特徴とする前記請求項１の貼り合わ
せディスク。(2) The bonded disk according to claim 1, wherein a paint film is formed on the outer peripheral end surface of the bonded disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63310116A JPH02156434A (en) | 1988-12-09 | 1988-12-09 | Laminated disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63310116A JPH02156434A (en) | 1988-12-09 | 1988-12-09 | Laminated disk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02156434A true JPH02156434A (en) | 1990-06-15 |
Family
ID=18001371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63310116A Pending JPH02156434A (en) | 1988-12-09 | 1988-12-09 | Laminated disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02156434A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS615452A (en) * | 1984-06-19 | 1986-01-11 | Matsushita Electric Ind Co Ltd | Information recording carrier |
| JPH01260647A (en) * | 1988-04-09 | 1989-10-17 | Hitachi Maxell Ltd | Optical information recording medium |
-
1988
- 1988-12-09 JP JP63310116A patent/JPH02156434A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS615452A (en) * | 1984-06-19 | 1986-01-11 | Matsushita Electric Ind Co Ltd | Information recording carrier |
| JPH01260647A (en) * | 1988-04-09 | 1989-10-17 | Hitachi Maxell Ltd | Optical information recording medium |
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