JP2001023238A - Information recording medium - Google Patents
Information recording mediumInfo
- Publication number
- JP2001023238A JP2001023238A JP11188546A JP18854699A JP2001023238A JP 2001023238 A JP2001023238 A JP 2001023238A JP 11188546 A JP11188546 A JP 11188546A JP 18854699 A JP18854699 A JP 18854699A JP 2001023238 A JP2001023238 A JP 2001023238A
- Authority
- JP
- Japan
- Prior art keywords
- information recording
- recording medium
- information
- substrate
- disk
- 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.)
- Withdrawn
Links
- 239000000758 substrate Substances 0.000 claims abstract description 30
- 230000002093 peripheral effect Effects 0.000 claims abstract description 12
- 239000011347 resin Substances 0.000 abstract description 21
- 229920005989 resin Polymers 0.000 abstract description 21
- 230000003287 optical effect Effects 0.000 abstract description 14
- 238000001746 injection moulding Methods 0.000 abstract description 3
- 230000008595 infiltration Effects 0.000 abstract 1
- 238000001764 infiltration Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 239000012790 adhesive layer Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、円板状情報記録媒
体、特にカートリッジに収納することなく使用される記
録媒体の基板形状に係る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc-shaped information recording medium, and more particularly to a substrate shape of a recording medium used without being housed in a cartridge.
【０００２】[0002]
【従来の技術】従来、カートリッジに収納することなく
使用される円板状記録媒体としては、ＣＤ、ＣＤ−ＲＯ
Ｍ、ＣＤ−Ｒ等単板状の記録媒体が広く用いられてい
る。図６にこれら記録媒体の一般的な平面図（半円の
み）を示す。図６において、中心孔４は直径１５ｍｍ
で、その外側の直径２６ｍｍから直径３３ｍｍまでの幅
が狭い方の円環状斜線部分の領域は円板状記録媒体をド
ライブのスピンドルに固定するためのクランプ領域Ｂと
して使用される。さらにこの外側の直径４６ｍｍ乃至直
径１１７ｍｍの幅が広い方の円環状斜線部分の領域はリ
−ドイン領域およびリ−ドアウト領域を含む情報記録領
域Ｃであり、直径１１７ｍｍからディスク最外径である
直径１２０ｍｍまでの範囲は最外周部分となるリム領域
Ｄである。また、ディスク基板の厚さの公称値は１．２
ｍｍであるが、領域Ｂと領域Ｃの間の領域および領域Ｄ
（リム領域）では多少の厚さの増減（±０．４ｍｍ以
内）は事実上認められている。このようにカートリッジ
に収納されることなく使用される円板状記録媒体の表面
はほとんど平面であり、製造工程中は勿論、エンドユー
ザの使用時においても記録媒体はそのまま取り扱われる
ため、その表面は常に露出した状態となっており、手接
触による表面汚染、ごみの堆積あるいは表面擦過による
傷の発生等の問題があった。2. Description of the Related Art Conventionally, disc-shaped recording media used without being housed in a cartridge include CDs and CD-ROs.
Single-plate recording media such as M and CD-R are widely used. FIG. 6 shows a general plan view (only a semicircle) of these recording media. In FIG. 6, the center hole 4 has a diameter of 15 mm.
The outer portion of the narrow annular hatched portion from the diameter of 26 mm to the diameter of 33 mm is used as a clamp region B for fixing the disc-shaped recording medium to the drive spindle. Further, the outer annular diagonally shaded area having a diameter of 46 mm to 117 mm outside is an information recording area C including a lead-in area and a lead-out area. The range up to 120 mm is the rim region D which is the outermost peripheral portion. The nominal value of the thickness of the disk substrate is 1.2.
mm, but the area between the area B and the area C and the area D
In the (rim region), a slight increase or decrease in thickness (within ± 0.4 mm) is practically recognized. As described above, the surface of the disc-shaped recording medium used without being stored in the cartridge is almost flat, and the recording medium is handled as it is, not only during the manufacturing process, but also during use by the end user. It is always exposed, and there are problems such as surface contamination due to hand contact, accumulation of dust, and scratches due to surface abrasion.
【０００３】通常、ＣＤあるいはＣＤ−ＲＯＭにおいて
は情報記録面には保護用の樹脂層が厚く形成されてお
り、この上にディスクのタイトル等が印刷されたいわゆ
るラベル面を形成している。しかしながら、この情報記
録面とは反対側面である光入射面における傷の影響は大
きい。このような傷は入射光の波面の乱れを生じ、記録
面上での光スポットの形状に乱れを発生させる。このよ
うな光スポットの形状の乱れは、情報の書き込み、読み
出し時のデータの誤りを引き起こすものであり、特に大
きな傷の場合にはトラッキング不能となってしまう。ま
た、このようなカートリッジに収納しないで使用される
平面構造のディスク面では最終的に樹脂材料による保護
膜が不可欠であり、この保護膜形成のためのスピンコー
トを行う際に図７に示すようにノズル７から供給された
樹脂８が情報記録面２に塗布後反対側の面、すなわち光
入射面９に回り込む可能性があり、樹脂材料の選定調
整、塗布条件の設定のみならず、回りこんでしまった樹
脂の拭き取り等の作業も必要であった。このため、図８
に示すように光入射面上の情報記録領域Ｃ及びクランプ
領域Ｂを除く領域に矩形断面の突起部１０を設けること
により情報記録媒体の基板１自体の強度を確保すると同
時に光入射面の保護を行う方法が特許公報第２８７３５
１９号および公開実用新案公報平２−５０９８５６号等
で開示されている。Normally, a CD or CD-ROM is provided with a thick protective resin layer on the information recording surface, on which a so-called label surface on which a disc title or the like is printed is formed. However, the influence of the scratch on the light incident surface opposite to the information recording surface is great. Such flaws cause disturbances in the wavefront of the incident light, causing disturbances in the shape of the light spot on the recording surface. Such irregularities in the shape of the light spot cause an error in data at the time of writing and reading information, and tracking becomes impossible particularly in the case of a large scratch. In addition, a protective film made of a resin material is finally indispensable on the disk surface having a planar structure used without being housed in such a cartridge, and when performing spin coating for forming this protective film, as shown in FIG. After the resin 8 supplied from the nozzle 7 is applied to the information recording surface 2, there is a possibility that the resin 8 will wrap around to the opposite surface, that is, the light incident surface 9. Work such as wiping off the resulting resin was also required. Therefore, FIG.
As shown in (1), by providing a projection 10 having a rectangular cross section in an area other than the information recording area C and the clamp area B on the light incident surface, the strength of the substrate 1 itself of the information recording medium is secured and at the same time protection of the light incident surface is achieved. A method of performing the method is disclosed in Japanese Patent Publication No. 28735.
No. 19 and Published Utility Model Publication No. 2-509856.
【０００４】[0004]
【発明が解決しようとする課題】以上述べた、従来のデ
ィスク面、特に情報記録面２の反対側の面である光入射
面９側はほとんど平面で構成されているか、あるいは保
護用として設けられた突起部は矩形断面を有するもので
あった。この矩形断面の突起部を設けることにより、製
造工程途中で製品ディスクをスタックして積み重ねる場
合の各ディスク間スペーサは不要となり、あるいエンド
ユーザに対しても、使用時のディスク面保護の効果は得
られるようになった。しかし、上記のように情報記録面
に樹脂を塗布する際の光入射面への回り込み、あるいは
成形時の離型性確保の点では未だ十分ではなかった。一
方、ＪＩＳ Ｘ ６２４３（ＤＶＤ−ＲＡＭ）においては
リム領域Ｄに台形断面の突起部を設ける構造が記載され
ているが、この突起の高さは光ディスクの最大厚さを超
えてはならないと規定されており、したがって、この高
さはせいぜい０．４ｍｍ以下であり、ディスク面保護あ
るいは樹脂の流れ込み防止の目的には不十分なものであ
る。本発明は、このような問題を排除し、情報記録面に
樹脂を塗布する際の光入射面への回り込み対策をより確
実なものとし、かつディスク面保護の効果を有する情報
記録媒体の提供を目的とするものである。As described above, the conventional disk surface, in particular, the light incident surface 9 opposite to the information recording surface 2 is almost flat or provided for protection. The projected portion had a rectangular cross section. By providing this rectangular cross-section projection, spacers between disks are not required when product disks are stacked and stacked during the manufacturing process, and the effect of protecting the disk surface during use for end users is also eliminated. Can now be obtained. However, as described above, it is not yet sufficient in terms of sneaking into the light incident surface when applying the resin to the information recording surface, or ensuring releasability during molding. On the other hand, JIS X6243 (DVD-RAM) describes a structure in which a protrusion having a trapezoidal cross section is provided in the rim area D, but it is specified that the height of the protrusion must not exceed the maximum thickness of the optical disk. Therefore, this height is at most 0.4 mm or less, which is insufficient for the purpose of protecting the disk surface or preventing the resin from flowing. The present invention eliminates such a problem and provides an information recording medium having a more reliable countermeasure against the light incident surface when applying a resin to the information recording surface, and having an effect of protecting the disk surface. It is the purpose.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明においては以下の構造の記録媒体とした。
すなわち、請求項１においては、一方の面がプリフォー
マットされた情報記録面を有する円盤状記録媒体の基板
で、この基板の情報記録面とは反対側の面の外周部に沿
って円環上突起部を形成しておき、かつ、この円環上突
起部の外縁部のさらに外側と円盤状記録媒体の最外周部
との間に平坦部を有しており、この円環上突起部の内縁
部は情報記録面において情報が記録されている領域に対
応する反対側の面の領域よりも外側に形成されている構
成としている。In order to achieve the above object, the present invention provides a recording medium having the following structure.
That is, in claim 1, a substrate of a disk-shaped recording medium having one side of which has a preformatted information recording surface, which is formed in an annular shape along the outer peripheral portion of the surface opposite to the information recording surface of the substrate. A projection is formed, and a flat portion is provided between the outer edge of the annular projection and the outermost peripheral portion of the disk-shaped recording medium. The inner edge portion is formed outside the area on the opposite side of the information recording surface corresponding to the area where information is recorded.
【０００６】請求項２においては、同じく一方の面がプ
リフォーマットされた情報記録面を有する円盤状記録媒
体の基板で、この基板の情報記録面と反対側の面の外周
部に沿って円環上突起部を形成しておき、この円環上突
起部の断面を形成する台形の底辺の両端に形成された内
包角のうち、情報が記録される領域側の内包角はこれと
反対側に位置する内包角よりも小さい角度で形成した構
造としている。According to a second aspect of the present invention, there is provided a disk-shaped recording medium substrate having a preformatted information recording surface on one side, and a ring formed along an outer peripheral portion of a surface opposite to the information recording surface of the substrate. The upper projection is formed, and among the included angles formed at both ends of the base of the trapezoid forming the cross section of the annular upper projected portion, the included angle on the side where information is recorded is on the opposite side. The angle is smaller than the included angle.
【０００７】請求項３においては、一方の面がプリフォ
ーマットされた情報記録面を有する円盤状記録媒体の基
板で、この基板の情報記録面と反対側の面で、情報が記
録されている領域と円盤状記録媒体をドライブのスピン
ドルに固定するためクランプする基板上の領域との間の
領域に対応する部分に円環上突起部を形成し、この円環
上突起部の断面を形成する台形の底辺の両端に形成され
た内包角のうち、情報が記録される領域側の内包角はこ
れと反対側に位置する内包角よりも小さい角度で形成し
た構造としている。According to a third aspect of the present invention, there is provided a disk-shaped recording medium substrate having one side having a preformatted information recording surface, and an area on which information is recorded on a surface opposite to the information recording surface of the substrate. A trapezoid that forms an annular projection on a portion corresponding to an area between the disk-shaped recording medium and an area on a substrate to be clamped to fix the disk-shaped recording medium to a drive spindle, and forms a cross section of the annular projection Of the included angles formed at both ends of the bottom side of, the included angle on the side where information is recorded is formed at a smaller angle than the included angle located on the opposite side.
【０００８】請求項４においては、一方の面がプリフォ
ーマットされた情報記録面を有する円盤状記録媒体の基
板で、請求項２および請求項３に記載した円環上突起部
を外周部近辺及びクランプ領域近辺の両方の領域に形成
した構造としている。According to a fourth aspect of the present invention, there is provided a disk-shaped recording medium substrate having an information recording surface on one side of which is preformatted. The structure is formed in both regions near the clamp region.
【０００９】請求項５においては、請求項１乃至請求項
４に記載した円環上突起部を円盤状記録媒体の情報記録
面とその反対側の面との両面に形成した構造としてい
る。According to a fifth aspect of the present invention, there is provided a structure in which the annular protrusions according to the first to fourth aspects are formed on both the information recording surface of the disk-shaped recording medium and the surface opposite thereto.
【００１０】請求項６においては、請求項１乃至請求項
４記載の円環上突起部を有する２枚の円盤状記録媒体基
板の情報記録面を互いに接着剤により貼り合せた構造と
している。According to a sixth aspect of the present invention, the information recording surfaces of the two disk-shaped recording medium substrates having the annular protrusions according to the first to fourth aspects are bonded to each other with an adhesive.
【００１１】[0011]
【発明の実施の形態】図１は本発明における第１の実施
の形態を適用した場合の情報記録媒体の断面図を示すも
ので、ディスク基板１の情報記録面側２とは反対側の面
すなわち光入射面９に円環状の突起部３を情報記録領域
Ｃに対応する光入射面９側の面上に設けた構造としてい
る。この突起部の断面形状は図２に示すように射出成形
時における溶融樹脂の流れの連続性、型抜きの容易さを
考慮して台形の形状が望ましく、また、射出成形時にお
ける溶融樹脂の流れの連続性すなわち光学的な均一性保
持を考慮すると底辺の両端の角度（内包角）は小さい方
が望ましい。この台形断面の突起部の幅は底辺部の長さ
５で決定される。例えば、図６においてリム領域Ｄの幅
はＣＤまたはＣＤ−ＲＯＭの場合６．５ｍｍまでスペー
ス領域として許容されているが、この台形部に近接する
部分は射出成型時の溶融樹脂流に乱れが生じ易く、これ
による密度不均一が生じることにより基板１の光学特性
の乱れが生じることがある。これを考慮すると、この台
形部底辺の幅５は実際には２ｍｍ程度以下が望ましい。
しかし、突起部の強度を確保する意味では上辺の長さも
必要となってくるが、底辺の長さを押さえかつ上辺の長
さを確保するためには底辺の両端の角度（内包角）が大
きくならざるを得ない。以上の考察から、突起部の幅を
大きくすることなく、また光学的な問題も生じないよう
な形状として図２に示すように台形底辺の両端の角度を
異なる角度とした。図２は情報記録領域Ｃの外側に設け
た突起部の例であるがθ1〉θ2の関係を持たせた。すな
わち、台形断面の底辺の情報記録領域Ｃ側はより小さな
角度として溶融樹脂の流れの乱れが少なくなるように
し、クランプ領域Ｂ側の角度は大きくとることにより非
対称の断面形状とすることにより台形部断面積を大きく
採るようにした。なお、台形の円環状突起３を、図６に
おいてクランプ領域Ｂと情報記録領域Ｃとの間の部分に
形成してもスペーサとしての効果は得られることに変わ
りはない。ここで、θ1に対しては２０°＜θ1≦９０°
の範囲であれば良いことが実験的に得られているが、望
ましくは６０°≦θ1≦９０°の方が好ましい。また、
θ2の値に関しては２０°≦θ2＜９０°で良いが、望ま
しくは４５°≦θ2≦７０°の方が良い。FIG. 1 is a sectional view of an information recording medium to which a first embodiment of the present invention is applied, and shows a surface of a disk substrate 1 opposite to an information recording surface 2. That is, the light incident surface 9 has a structure in which the annular protrusion 3 is provided on the surface on the light incident surface 9 side corresponding to the information recording area C. As shown in FIG. 2, the cross-sectional shape of the protrusion is desirably a trapezoidal shape in consideration of the continuity of the flow of the molten resin during injection molding and the ease of die cutting. In consideration of the continuity, that is, maintaining optical uniformity, it is desirable that the angle (inclusive angle) at both ends of the base is small. The width of the projection of this trapezoidal cross section is determined by the length 5 of the base. For example, in FIG. 6, the width of the rim area D is allowed as a space area up to 6.5 mm in the case of a CD or a CD-ROM. It is easy to cause unevenness in the density, which may cause the optical characteristics of the substrate 1 to be disturbed. In consideration of this, it is desirable that the width 5 of the bottom of the trapezoid is actually about 2 mm or less.
However, in order to secure the strength of the projection, the length of the upper side is also required, but in order to hold down the length of the base and secure the length of the upper side, the angle (inclusive angle) of both ends of the base is large I have to be. From the above considerations, as shown in FIG. 2, the angles at both ends of the trapezoidal base were set to different angles without increasing the width of the projection and without causing any optical problems. FIG. 2 shows an example of a projection provided outside the information recording area C, but the relationship of θ 1 > θ 2 is provided. In other words, the information recording area C on the bottom side of the trapezoidal cross section is set to a smaller angle so that the disturbance of the flow of the molten resin is reduced. The cross section was made large. Even if the trapezoidal annular projection 3 is formed in a portion between the clamp area B and the information recording area C in FIG. 6, the effect as a spacer is still obtained. Here, for θ 1 , 20 ° <θ 1 ≦ 90 °
It has been experimentally obtained that the range should be within the range described above, but desirably 60 ° ≦ θ 1 ≦ 90 °. Also,
Good at 20 ° ≦ θ 2 <90 ° with respect to theta 2 value, but preferably is better 45 ° ≦ θ 2 ≦ 70 ° .
【００１２】さらに、図８の場合はディスク最外周の位
置に突起部を設けているため、樹脂の回り込みの点では
突起部の先端部まで樹脂が流れる可能性があり、この場
合には樹脂が更に光入射面の情報記録領域に対応する部
分にまで流れ込む可能性があった。このため、本発明の
第１の実施の形態においては図１および図２に示すよう
に、ディスク最外周と突起部との間に長さＬの平坦部を
設けた。これにより、情報記録面２から流れ込んだ樹脂
はこの平坦部Ｌと突起部とで構成された空間に溜まるこ
とになり、光入射面側に流れ込むのを防ぐことが出来
る。この平坦部Ｌの大きさとしては、狭すぎると樹脂が
反対側の面に流れ込み、大きすぎると記録領域を圧迫し
て記憶容量を低下させる。このことから、０．１ｍｍ≦
Ｌ≦１０ｍｍで良いが、より望ましくは０．１ｍｍ≦Ｌ
≦１ｍｍが良い。なお、この台形断面の円環上突起部３
の高さに関しては、光ピックアップのワーキングディス
タンス、及び基板厚さが１．２ｍｍであるから溶融樹脂
の流れ等を考慮すると基板１の面から突出している高さ
はせいぜい１ｍｍ以下であることが望まれるが、特にリ
ム領域Ｄにおける突起部に対しては内周側より低くして
おいた方が、対物レンズ保護の観点から光ピックアップ
に対してより安全な形状とすることが出来る。Further, in the case of FIG. 8, since the projection is provided at the position of the outermost periphery of the disk, there is a possibility that the resin flows to the tip of the projection at the point of the resin wraparound. Further, there is a possibility that the light may flow into a portion corresponding to the information recording area on the light incident surface. For this reason, in the first embodiment of the present invention, as shown in FIGS. 1 and 2, a flat portion having a length L is provided between the outermost periphery of the disk and the projection. As a result, the resin flowing from the information recording surface 2 accumulates in the space defined by the flat portion L and the protrusion, and can be prevented from flowing into the light incident surface side. If the size of the flat portion L is too small, the resin flows into the opposite surface. If the size is too large, the recording area is pressed and the storage capacity is reduced. From this, 0.1 mm ≦
L ≦ 10 mm, but more preferably 0.1 mm ≦ L
≦ 1 mm is good. The trapezoidal cross section of the annular projection 3
In view of the working distance of the optical pickup and the thickness of the substrate is 1.2 mm, the height protruding from the surface of the substrate 1 is preferably at most 1 mm or less in consideration of the flow of the molten resin. However, it is particularly preferable that the projections in the rim area D are lower than the inner peripheral side, so that the optical pickup can be formed in a safer shape from the viewpoint of protection of the objective lens.
【００１３】図３（ａ）は本発明における第２の実施の
形態を示すもので、上記第１の実施の形態で形成した台
形断面形状の円環上突起部３を外周部と同時に内周部に
も設けることにより、ディスク面保護の効果をさらに上
げた場合の断面図を示す。FIG. 3 (a) shows a second embodiment of the present invention, in which the annular projection 3 having the trapezoidal cross section formed in the first embodiment is formed at the same time as the outer periphery and the inner periphery. FIG. 3 is a cross-sectional view showing a case where the effect of protecting the disk surface is further improved by providing the same in the portion.
【００１４】次に本発明における第３の実施の形態につ
いて述べる。以上の説明では、台形断面の円環上突起部
３は光入射面９に形成したものであるが、図３（ｂ）に
示すように情報記録面２と光入射面９との両面に同時に
形成することにより、記録媒体を積み重ねる際の面保護
の効果をさらに向上することが出来る。Next, a third embodiment of the present invention will be described. In the above description, the annular projection 3 having a trapezoidal cross section is formed on the light incident surface 9, but as shown in FIG. 3B, both the information recording surface 2 and the light incident surface 9 are simultaneously formed. By forming them, the effect of surface protection when stacking recording media can be further improved.
【００１５】また、図４は第４の実施の形態を示すもの
である。すなわち、図４に示すように上記突起部３を光
入射面９側のみに形成した２枚の記録媒体の、情報記録
面２側を接着層１１を介して互いに張り合わせることに
より両面に突起部が形成された張り合わせ構造の記録媒
体にも適用することが出来る。FIG. 4 shows a fourth embodiment. That is, as shown in FIG. 4, the information recording surface 2 side of the two recording media in which the protrusions 3 are formed only on the light incident surface 9 side are adhered to each other via the adhesive layer 11 so that the protrusions are formed on both surfaces. Can also be applied to a recording medium having a laminated structure in which is formed.
【００１６】また、図５は本発明における第５の実施の
形態を示すものである。以上の説明では、円環状突起部
３はすべて基板１の射出成形時に一体成形により形成さ
れものであるが、図５に示すように記録媒体の基板１は
従来通りの平面構造とし、上記突起部の位置に上記の台
形断面形状を有する円環６を接着することによっても同
様の効果を得ることが出来る。この場合、円環６の材料
として基板材料よりも固い材料を使用するかあるいは基
板１と同じ材質にガラス繊維等フィラーを混入すること
により強度を向上することが可能となる。FIG. 5 shows a fifth embodiment of the present invention. In the above description, the annular projections 3 are all formed by integral molding during the injection molding of the substrate 1. However, as shown in FIG. 5, the substrate 1 of the recording medium has a conventional planar structure, The same effect can be obtained by bonding the ring 6 having the above trapezoidal cross-sectional shape to the position. In this case, the strength can be improved by using a material harder than the substrate material as the material of the ring 6 or by mixing a filler such as glass fiber into the same material as the substrate 1.
【００１７】[0017]
【発明の効果】本発明による円環上突起部及び情報記録
媒体の最外周部に樹脂の溜り部分を設けることにより、
製造工程において製品媒体をスタックする場合のスペー
サの挿入、光入射面に流れ出た樹脂の拭き取り作業等が
不要となり、工程の簡略化を実現することが出来、さら
にユーザ側においても取扱性の向上が実現し得た。According to the present invention, by providing an annular protrusion according to the present invention and a resin pool at the outermost periphery of the information recording medium,
In the manufacturing process, there is no need to insert spacers when stacking product media and wipe off the resin that has flowed into the light incident surface, thus simplifying the process and improving user-friendliness. Could be realized.
【図１】本発明における第１の実施の形態を適用した光
ディスクの断面図。FIG. 1 is a sectional view of an optical disc to which a first embodiment of the present invention has been applied.
【図２】本発明におけるディスク面突起部の断面図。FIG. 2 is a sectional view of a disk surface protrusion according to the present invention.
【図３】（ａ）本発明における第２の実施の形態を示す
光ディスクの断面図、（ｂ）本発明第３の実施の形態に
おいて突起部をディスク両面に設置した場合の断面図。FIG. 3A is a cross-sectional view of an optical disc showing a second embodiment of the present invention, and FIG. 3B is a cross-sectional view of the third embodiment of the present invention when protrusions are provided on both sides of the disc.
【図４】本発明における第４の実施の形態を示す光ディ
スクの断面図。FIG. 4 is a sectional view of an optical disc showing a fourth embodiment of the present invention.
【図５】本発明における第５の実施の形態を示す光ディ
スクの断面図。FIG. 5 is a sectional view of an optical disc showing a fifth embodiment of the present invention.
【図６】従来の光ディスクの平面図。FIG. 6 is a plan view of a conventional optical disc.
【図７】従来の光ディスクにおいて樹脂塗布時の問題点
を示す断面図。FIG. 7 is a cross-sectional view showing a problem at the time of resin application in a conventional optical disc.
【図８】従来公知の光ディスク外周部に円環状突起部を
設けた断面図。FIG. 8 is a cross-sectional view in which an annular projection is provided on an outer peripheral portion of a conventionally known optical disc.
１：基板 ２：情報記録面 ３：突起部 ４：中心孔 ５：台形突起部の底辺の長さ ６：円環 ７：ノズル ８：溶融樹脂 ９：光入射面 １０：従来公知の矩形断面形状の突起 １１：接着層 1: substrate 2: information recording surface 3: projection 4: center hole 5: length of the bottom of trapezoidal projection 6: ring 7: nozzle 8: molten resin 9: light incident surface 10: conventionally known rectangular cross-sectional shape Projection 11: adhesive layer
Claims (6)
録面を有する円盤状記録媒体の基板において、該基板の
該情報記録面と反対側の面の外周部に沿って円環上突起
部を具備しており、かつ、該円環上突起部の外縁部のさ
らに外側と該円盤状記録媒体の最外周部との間に平坦部
を有し、該円環上突起部の内縁部は該情報記録面におい
て情報が記録されている領域に対応する反対側の面の領
域よりも外側に形成されていることを特長とする情報記
録媒体。1. A substrate of a disk-shaped recording medium having an information recording surface with one surface preformatted, wherein an annular protrusion is formed along an outer peripheral portion of a surface of the substrate opposite to the information recording surface. And a flat portion between the outer edge of the annular protrusion and the outermost peripheral portion of the disc-shaped recording medium, and the inner edge of the annular protrusion is An information recording medium characterized in that the information recording medium is formed outside an area on the opposite side of the information recording surface corresponding to the area where information is recorded.
録面を有する円盤状記録媒体の基板において、該基板の
該情報記録面と反対側の面の外周部に沿って円環上突起
部を具備しており、該円環上突起部の断面を形成する台
形の底辺の両端に形成された内包角のうち、情報が記録
される領域側の内縁側内包角はこれと反対側に位置する
外縁側内包角よりも小さい角度で形成されていることを
特長とする情報記録媒体。2. A disk-shaped recording medium substrate having a preformatted information recording surface on one side, wherein an annular protrusion is formed along an outer peripheral portion of a surface of the substrate opposite to the information recording surface. Among the included angles formed at both ends of the base of the trapezoid forming the cross section of the annular protrusion, the included angle on the inner edge side of the area where information is recorded is located on the opposite side. An information recording medium characterized by being formed at an angle smaller than an outer edge included angle.
録面を有する円盤状記録媒体の基板において、該基板の
該情報記録面と反対側の面で、情報が記録されている領
域と該円盤状記録媒体をドライブのスピンドルに固定す
るためクランプする領域との間の領域に対応する部分に
円環上突起部を具備しており、該円環上突起部の断面を
形成する台形の底辺の両端に形成された内包角のうち、
情報が記録される領域側の外縁側内包角はこれと反対側
に位置する内縁側内包角よりも小さい角度で形成されて
いることを特長とする情報記録媒体。3. A substrate of a disc-shaped recording medium having an information recording surface on one side of which is preformatted, wherein an area where information is recorded is formed on a surface of the substrate opposite to the information recording surface and the disc has A portion corresponding to a region between the clamping portion and the region for clamping the recording medium to the drive spindle, and having a toroidal protrusion, and a trapezoidal base forming a cross section of the toroidal protrusion. Of the included angles formed at both ends,
An information recording medium characterized in that the outer edge side included angle on the side where information is recorded is formed at a smaller angle than the inner edge side included angle located on the opposite side.
録面を有する円盤状記録媒体の基板において、請求項２
または請求項３に記載の円環上突起部を外周部近辺とク
ランプ領域近辺とに具備していることを特徴とする情報
記録媒体。4. A disk-shaped recording medium substrate having a preformatted information recording surface on one side.
4. An information recording medium comprising the annular protrusion according to claim 3 near an outer peripheral portion and near a clamp region.
を円盤状記録媒体の情報記録面とその反対側の面との両
面に具備していることを特徴とする情報記録媒体。5. An information recording medium comprising the annular protrusion according to claim 1 provided on both the information recording surface of the disk-shaped recording medium and the surface opposite to the information recording surface. .
を有する２枚の円盤状記録媒体基板の情報記録面を互い
に貼り合せ接着した構造であることを特徴とする情報記
録媒体。6. An information recording medium having a structure in which the information recording surfaces of two disc-shaped recording medium substrates having an annular projection according to claim 1 are adhered to each other. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11188546A JP2001023238A (en) | 1999-07-02 | 1999-07-02 | Information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11188546A JP2001023238A (en) | 1999-07-02 | 1999-07-02 | Information recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001023238A true JP2001023238A (en) | 2001-01-26 |
Family
ID=16225602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11188546A Withdrawn JP2001023238A (en) | 1999-07-02 | 1999-07-02 | Information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001023238A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002069335A2 (en) * | 2001-02-21 | 2002-09-06 | Kuchman Todd J | Optical disc and method of protecting same |
| WO2003069610A1 (en) * | 2002-02-13 | 2003-08-21 | Sony Corporation | Disklike optical recording medium |
| US6842409B2 (en) | 2001-02-21 | 2005-01-11 | Scratch-Less Disc Industries, Llc | Optical disc and method of protecting same |
| JP2008004252A (en) * | 2006-05-26 | 2008-01-10 | Tdk Corp | Information medium substrate and information medium |
| JP2008130216A (en) * | 2006-11-24 | 2008-06-05 | Taiyo Yuden Co Ltd | Optical information recording medium |
-
1999
- 1999-07-02 JP JP11188546A patent/JP2001023238A/en not_active Withdrawn
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7102985B2 (en) | 2001-02-21 | 2006-09-05 | Scratch-Less Disc Industries, Llc | Optical disc and method of protecting same |
| WO2002069335A3 (en) * | 2001-02-21 | 2002-12-12 | Todd J Kuchman | Optical disc and method of protecting same |
| US6680898B2 (en) | 2001-02-21 | 2004-01-20 | Todd J. Kuchman | Optical disc and method of protecting same |
| US6842409B2 (en) | 2001-02-21 | 2005-01-11 | Scratch-Less Disc Industries, Llc | Optical disc and method of protecting same |
| AU2002245466B2 (en) * | 2001-02-21 | 2005-12-22 | Scratch-Less Disc Industries Llc | Optical disc and method of protecting same |
| WO2002069335A2 (en) * | 2001-02-21 | 2002-09-06 | Kuchman Todd J | Optical disc and method of protecting same |
| US7212489B2 (en) | 2001-02-21 | 2007-05-01 | Scratch-Less Disc Industries, Llc | Optical disc and method of protecting same |
| US7417941B2 (en) | 2001-02-21 | 2008-08-26 | Scratch-Less Disc Industries, Llc | Optical disc and method of protecting same |
| WO2003069610A1 (en) * | 2002-02-13 | 2003-08-21 | Sony Corporation | Disklike optical recording medium |
| JP2008004252A (en) * | 2006-05-26 | 2008-01-10 | Tdk Corp | Information medium substrate and information medium |
| US7989099B2 (en) | 2006-05-26 | 2011-08-02 | Tdk Corporation | Information medium substrate and information medium |
| JP2008130216A (en) * | 2006-11-24 | 2008-06-05 | Taiyo Yuden Co Ltd | Optical information recording medium |
| JP4708316B2 (en) * | 2006-11-24 | 2011-06-22 | 太陽誘電株式会社 | Optical information recording medium |
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