JP2981333B2 - Optical information recording medium - Google Patents
Optical information recording mediumInfo
- Publication number
- JP2981333B2 JP2981333B2 JP4023212A JP2321292A JP2981333B2 JP 2981333 B2 JP2981333 B2 JP 2981333B2 JP 4023212 A JP4023212 A JP 4023212A JP 2321292 A JP2321292 A JP 2321292A JP 2981333 B2 JP2981333 B2 JP 2981333B2
- Authority
- JP
- Japan
- Prior art keywords
- information recording
- substrate
- recording medium
- hole
- optical information
- 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 - Fee Related
Links
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
【0001】[0001]
【技術分野】本発明は、光情報記録媒体に関する。TECHNICAL FIELD The present invention relates to an optical information recording medium.
【0002】[0002]
【従来技術】従来の光ディスク基板は、その中心部に中
心穴があいている以外は平坦な面で構成されている。ま
た、光情報記録媒体(追記型,光磁気,相変化,CD,
CD−ROMなど)は、通常、記録再生装置(以下、ド
ライブという)にセットして使用される。このドライブ
は電子部品を内蔵した装置であり、通電中は必ず何らか
の発熱を伴う。特に、媒体を回転させるために媒体と接
触するスピンドルの部分はモータに近く、高温になって
いる。2. Description of the Related Art A conventional optical disk substrate has a flat surface except that a center hole is formed in the center thereof. Optical information recording media (write-once, magneto-optical, phase change, CD,
A CD-ROM or the like is usually set in a recording / reproducing device (hereinafter referred to as a drive) and used. This drive is a device having built-in electronic components, and always generates some heat during energization. In particular, the portion of the spindle that contacts the media to rotate the media is close to the motor and hot.
【0003】一方、光情報記録媒体の基板材料として
は、一般的にポリカーボネート樹脂が用いられる。この
ポリカーボネート樹脂は光弾性定数が大きく、媒体をド
ライブに装置した直後は、急激な温度上昇のために複屈
折が増大し、記録再生特性に悪影響が出る。更に、スピ
ンドル部が高温になっているため、媒体の内周部だけが
特に温度上昇をきたし、板面内の温度ムラにより複屈折
の増大に拍車をかけることになってしまう。また、媒体
のモータ側の面と反対側の面とでは温度差がつき、複屈
折だけでなく、面振れへの影響もある。On the other hand, a polycarbonate resin is generally used as a substrate material of an optical information recording medium. This polycarbonate resin has a large photoelastic constant. Immediately after a medium is mounted on a drive, a rapid rise in temperature causes an increase in birefringence, which adversely affects recording and reproduction characteristics. Further, since the temperature of the spindle portion is high, only the inner peripheral portion of the medium has a particularly high temperature, and the temperature unevenness in the plate surface causes an increase in birefringence. In addition, there is a temperature difference between the surface of the medium on the motor side and the surface on the opposite side, which affects not only birefringence but also surface deflection.
【0004】[0004]
【目的】本発明は、上述のごとき実情に鑑みてなされた
もので、媒体の急激な温度上昇を防ぎ、また媒体の上下
面温度差を小さくして記録再生特性の悪化をきたさない
ようにした光情報記録媒体を提供することを目的として
なされたものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been made to prevent a rapid rise in the temperature of a medium and to reduce the difference in temperature between the upper and lower surfaces of the medium so as not to deteriorate the recording / reproducing characteristics. The purpose of the present invention is to provide an optical information recording medium.
【0005】[0005]
【構成】本発明は、上記目的を達成するために、(1)
レーザー等の高エネルギービームを照射し、情報の記録
再生を行う光記録媒体において、情報を記録する領域の
最内周と基板の最内周との間に基板の表裏を貫通する穴
を設けたこと、更には、(2)前記穴が記録領域の最内
周と基板中心部のクランピングゾーンの間に複数個設け
られたこと、更には、(3)前記(2)において、前記
穴の中心軸が板面に対し垂直ではなく、穴の中心が存在
する基板の半径位置の円周方向に向けて5°以上、70
°以下の角度で倒れており、倒れの方向の円周方向から
のずれが±45°以下であること、更には、(4)前記
(3)において、前記穴の少くとも1つの中心軸の倒れ
方向が、他の穴の基板の円周方向への倒れ方向と逆の方
向へ向いていること、更には、(5)前記(2)におい
て、前記穴の記録領域の最内周と基板中心部のクランピ
ングゾーンの間の面積に対する開口率が3%以上、80
%以下であることを特徴としたものである。以下、本発
明の実施例に基づいて説明する。To achieve the above object, the present invention provides (1)
In an optical recording medium that irradiates a high-energy beam such as a laser and performs recording and reproduction of information, a hole is provided between the innermost periphery of a region for recording information and the innermost periphery of the substrate to penetrate the front and back of the substrate. And (2) a plurality of holes are provided between the innermost circumference of the recording area and the clamping zone at the center of the substrate. (3) In (2) above, The center axis is not perpendicular to the plate surface, but is more than 5 ° in the circumferential direction at the radial position of the substrate where the center of the hole exists.
And the deviation from the circumferential direction in the direction of the inclination is ± 45 ° or less. (4) In (3), at least one central axis of the hole is The falling direction is opposite to the circumferential direction of the substrate of the other hole. (5) In (2), the innermost circumference of the recording area of the hole and the substrate The opening ratio to the area between the central clamping zones is 3% or more, 80
% Or less. Hereinafter, a description will be given based on examples of the present invention.
【0006】図1は、本発明による光情報記録媒体の一
実施例を説明するための構成図で、図中、1,2は基
板、3,4は記録層、5はハブ、6は接着層、7は情報
記録エリア、8はクランピングゾーン、9は間の領域、
10は穴である。基板1,2は、記録層3,4を内側にし
て貼り合わせた構造をしており、中心部にはハブ5が設
けられている。情報記録エリア7とクランピングゾーン
8の間の領域9には、媒体の上下面を貫通する穴10が
設けられている。穴10は複数個設けることが好まし
く、その配置は、媒体の回転中心に対し、ダイナミック
バランスをとれる位置に配置することが好ましい。穴の
形状は円形が好ましいが、楕円形,三角形,四角形,多
角形など、どんな形状でも可能である。FIG. 1 is a structural view for explaining an embodiment of an optical information recording medium according to the present invention. In the figure, reference numerals 1 and 2 denote a substrate, reference numerals 3 and 4 denote recording layers, reference numeral 5 denotes a hub, and reference numeral 6 denotes an adhesive. Layer, 7 is an information recording area, 8 is a clamping zone, 9 is an area between,
10 is a hole. The substrates 1 and 2 have a structure in which the recording layers 3 and 4 are adhered to each other, and a hub 5 is provided at the center. In an area 9 between the information recording area 7 and the clamping zone 8, a hole 10 penetrating the upper and lower surfaces of the medium is provided. Preferably, a plurality of holes 10 are provided, and the holes 10 are preferably arranged at positions where dynamic balance can be achieved with respect to the rotation center of the medium. The shape of the hole is preferably circular, but any shape such as elliptical, triangular, square, polygonal, etc. is possible.
【0007】図2は、従来の媒体をドライブに設置した
場合を示す。スピンドル14の熱15は基板12を通っ
て記録エリア13に達する。図3は、本発明の媒体をド
ライブに設置した場合を示す。スピンドル16の熱15
は穴17の部分で空気中へ発散し、記録エリア13に達
する熱は減少する。FIG. 2 shows a case where a conventional medium is installed in a drive. The heat 15 of the spindle 14 reaches the recording area 13 through the substrate 12. FIG. 3 shows a case where the medium of the present invention is installed in a drive. Heat 15 of spindle 16
Diverges into the air at the hole 17 and the heat reaching the recording area 13 decreases.
【0008】図4(a),(b),(c)は、本発明によ
る光情報記録媒体の他の実施例を示す図で、図中、1
8,19は穴、20,21は中心軸である。図(b)は
図(a)A−A′断面図、図(c)は図(a)のB−
B′断面図である。穴18の中心軸20は基板との垂線
よりθ傾いており、また穴19の中心軸21は基板との
垂線よりθ′逆の方向に傾いている。これにより、基板
が回転すると基板の上面から下面へ、また下面から上面
への気流が生じ、媒体の上下面の温度差が軽減される。FIGS. 4A, 4B, and 4C show another embodiment of the optical information recording medium according to the present invention.
8 and 19 are holes, and 20 and 21 are central axes. FIG. 2B is a sectional view taken along line AA ′ of FIG. 2A, and FIG.
It is B 'sectional drawing. The central axis 20 of the hole 18 is inclined by θ from the perpendicular to the substrate, and the central axis 21 of the hole 19 is inclined by θ ′ opposite to the perpendicular to the substrate. As a result, when the substrate rotates, an airflow is generated from the upper surface to the lower surface and from the lower surface to the upper surface, and the temperature difference between the upper and lower surfaces of the medium is reduced.
【0009】中心軸の傾きθ,θ′は5°以上、70°
以下が好ましい。5°以下では気流を生じる効果が少な
く、70°以上では穴の形成が困難である。また、中心
軸の、中心軸が存在する半径の接線方向に対するズレ
は、±45°以下であることが好ましい。45°以上に
なると気流を生じる効果が小さくなる。また、穴の大き
さは、情報記録エリアとクランピングゾーンの間の領域
に入れば任意であるが、この領域の面積に対する開口率
が3%以上、80%以下であることが好ましい。3%以
下では放熱効果および上下面間の気流を生じる効果が得
られず、80%以上では媒体の剛性が低下してしまうた
めである。The inclination θ, θ ′ of the central axis is 5 ° or more and 70 °
The following is preferred. When the angle is 5 ° or less, the effect of generating an air flow is small, and when the angle is 70 ° or more, it is difficult to form a hole. Further, it is preferable that the deviation of the radius of the central axis where the central axis exists from the tangential direction is ± 45 ° or less. When the angle is 45 ° or more, the effect of generating an airflow decreases. The size of the hole is arbitrary as long as it falls within the area between the information recording area and the clamping zone, but it is preferable that the aperture ratio with respect to the area of this area is 3% or more and 80% or less. If it is less than 3%, the heat radiation effect and the effect of generating airflow between the upper and lower surfaces cannot be obtained, and if it is more than 80%, the rigidity of the medium is reduced.
【0010】図5には、本発明を実施した場合の媒体面
の温度上昇の経時変化を示す。図中、は実施例下面、
は実施例上面、は比較例下面、は比較例上面の場
合を各々示している。媒体は130mmの両面貼り合わせ
タイプを用い、外気温20℃、ドライブ内気温35℃、
スピンドル部温度45℃の条件で、外気とほぼ同温度に
なった媒体をドライブに挿入した後の半径30mmの基板
面の温度を測定した。媒体は半径25mmの位置に、円周
方向には等間隔に8個の円形の穴(半径3mm)を設け
た。穴の中心軸は4個を穴の存在する位置の接線方向へ
20°倒し、残りを逆の方向へ20°倒した。比較のた
めに従来の媒体を用い、同様の試験を行った。本発明の
媒体温度はドライブ内気温より3℃しか上昇せず、上下
面温度差も2℃であったが、比較例では、スピンドル側
の面はスピンドル部温度まで上昇し、上下面温度差も5
℃あった。なお、本発明は貼り合わせタイプのみでな
く、単板タイプにも適用できることはもちろんである。FIG. 5 shows a time-dependent change in the temperature rise of the medium surface when the present invention is carried out. In the figure, is the bottom surface of the embodiment,
Represents the case of the upper surface of the example, represents the lower surface of the comparative example, and represents the case of the upper surface of the comparative example. The medium is 130mm double-sided bonding type, the outside temperature is 20 ℃, the drive temperature is 35 ℃,
Under the condition of the spindle temperature of 45 ° C., the temperature of the substrate surface having a radius of 30 mm was measured after inserting a medium having substantially the same temperature as the outside air into the drive. The medium was provided with eight circular holes (radius 3 mm) at a radius of 25 mm and at equal intervals in the circumferential direction. Four central axes of the holes were tilted by 20 ° in the tangential direction of the position where the holes exist, and the rest were tilted by 20 ° in the opposite direction. A similar test was performed using a conventional medium for comparison. The medium temperature of the present invention increased only by 3 ° C. from the internal temperature of the drive, and the temperature difference between the upper and lower surfaces was 2 ° C. However, in the comparative example, the surface on the spindle side rose to the temperature of the spindle portion, and the temperature difference between the upper and lower surfaces also increased. 5
° C. In addition, it goes without saying that the present invention can be applied not only to the bonding type but also to the single plate type.
【0011】[0011]
【効果】以上の説明から明らかなように、本発明による
と、以下のような効果がある。 (1)情報記録領域と基板最内周の間に穴を設けたこと
により、スピンドルから伝わる熱を軽減することができ
る。 (2)穴をクランピングエリアの外側にすることによ
り、クランピングへの影響なしに前記(1)の効果が得
られる。 (3)穴の軸を傾けることにより上下面間に気流を発生
させ、上下面温度差を減らすことができる。As apparent from the above description, the present invention has the following effects. (1) By providing a hole between the information recording area and the innermost circumference of the substrate, heat transmitted from the spindle can be reduced. (2) By making the hole outside the clamping area, the effect of (1) can be obtained without affecting clamping. (3) By inclining the axis of the hole, an airflow is generated between the upper and lower surfaces, and the temperature difference between the upper and lower surfaces can be reduced.
【図1】 本発明による光情報記録媒体の一実施例を説
明するための構成図である。FIG. 1 is a configuration diagram for explaining an embodiment of an optical information recording medium according to the present invention.
【図2】 従来の媒体をドライブに設置した場合を示す
図である。FIG. 2 is a diagram illustrating a case where a conventional medium is installed in a drive.
【図3】 本発明の媒体をドライブに設置した場合を示
す図である。FIG. 3 is a diagram showing a case where the medium of the present invention is installed in a drive.
【図4】 本発明による光情報記録媒体の他の実施例を
示す図である。FIG. 4 is a diagram showing another embodiment of the optical information recording medium according to the present invention.
【図5】 媒体面の温度上昇の経時変化を示す図であ
る。FIG. 5 is a diagram showing a temporal change in temperature rise of a medium surface.
1,2…基板、3,4…記録層、5…ハブ、6…接着層、
7…情報記録エリア、8…クランピングゾーン、9…間
の領域、10…穴。1,2: substrate, 3,4: recording layer, 5: hub, 6: adhesive layer,
7 ... information recording area, 8 ... clamping zone, 9 ... area, 10 ... hole
Claims (5)
し、情報の記録再生を行う光記録媒体において、情報を
記録する領域の最内周と基板の最内周との間に基板の表
裏を貫通する穴を設けたことを特徴とする光情報記録媒
体。1. An optical recording medium for recording and reproducing information by irradiating a high energy beam such as a laser to penetrate the front and back of a substrate between an innermost periphery of an information recording area and an innermost periphery of the substrate. An optical information recording medium characterized by having a hole formed therein.
のクランピングゾーンの間に複数個設けられたことを特
徴とする請求項1記載の光情報記録媒体。2. The optical information recording medium according to claim 1, wherein a plurality of said holes are provided between an innermost periphery of a recording area and a clamping zone at a center of the substrate.
く、穴の中心が存在する基板の半径位置の円周方向に向
けて5°以上、70°以下の角度で倒れており、倒れの
方向の円周方向からのずれが±45°以下であることを
特徴とする請求項2記載の光情報記録媒体。3. The center axis of the hole is not perpendicular to the plate surface, but is inclined at an angle of 5 ° or more and 70 ° or less in a circumferential direction of a radial position of the substrate where the center of the hole exists, 3. The optical information recording medium according to claim 2, wherein a deviation of a falling direction from a circumferential direction is ± 45 ° or less.
方向が、他の穴の基板の円周方向への倒れ方向と逆の方
向へ向いていることを特徴とする請求項3記載の光情報
記録媒体。4. The light according to claim 3, wherein the direction in which at least one central axis of the holes falls is opposite to the direction in which the other holes fall in the circumferential direction of the substrate. Information recording medium.
のクランピングゾーンの間の面積に対する開口率が3%
以上、80%以下であることを特徴とする請求項2記載
の光情報記録媒体。5. An aperture ratio of 3% with respect to an area between an innermost circumference of a recording area of the hole and a clamping zone at a center of the substrate.
3. The optical information recording medium according to claim 2, wherein the content is at least 80%.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4023212A JP2981333B2 (en) | 1992-01-13 | 1992-01-13 | Optical information recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4023212A JP2981333B2 (en) | 1992-01-13 | 1992-01-13 | Optical information recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05189806A JPH05189806A (en) | 1993-07-30 |
JP2981333B2 true JP2981333B2 (en) | 1999-11-22 |
Family
ID=12104360
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4023212A Expired - Fee Related JP2981333B2 (en) | 1992-01-13 | 1992-01-13 | Optical information recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2981333B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU4722897A (en) * | 1997-08-22 | 1999-03-16 | Tetsuya Oguchi | Recording medium and method of manufacturing recording media |
-
1992
- 1992-01-13 JP JP4023212A patent/JP2981333B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH05189806A (en) | 1993-07-30 |
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Legal Events
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LAPS | Cancellation because of no payment of annual fees |