JPH0440682A - Optical information recording disk - Google Patents

Optical information recording disk

Info

Publication number
JPH0440682A
JPH0440682A JP2148410A JP14841090A JPH0440682A JP H0440682 A JPH0440682 A JP H0440682A JP 2148410 A JP2148410 A JP 2148410A JP 14841090 A JP14841090 A JP 14841090A JP H0440682 A JPH0440682 A JP H0440682A
Authority
JP
Japan
Prior art keywords
disk
insides
outsides
hub members
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.)
Pending
Application number
JP2148410A
Other languages
Japanese (ja)
Inventor
Masaaki Umehara
正彬 梅原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP2148410A priority Critical patent/JPH0440682A/en
Publication of JPH0440682A publication Critical patent/JPH0440682A/en
Pending legal-status Critical Current

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  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

PURPOSE:To suppress double refraction to be generated by stress due to screwing by superposing three disks having respectively different diameters and arranging a contact face between a hub member and a disk base in the vicinity of a center hole. CONSTITUTION:The hub members 5, 5 are constituted of cutting the insides of respective flange parts 7 so as to previously leaving proper ring-like step parts 9 on respective boss parts 6 and forming slight gaps 10 between the outsides of respective disk bases 1 and the insides of the flange parts 7. Namely, three disks having respectively different radiuses are concentrically stacked in the descending order and a concentrical hole is formed on the center part. Thus, a pair of hub members 5 are constituted of cutting off the size of the fixing face to be attached to a turn table, i.e. a part exposed to the outsides of the disk bases 1 so as to leave a part close to the center hole as much as possible and forming gaps between the insides of the flange parts 7 and outsides of the disk bases 1. Consequently, the generation of stress due to the clamping force of a screw is deviated from the recording area of each disk base and the influence of double refraction due to the stress can be suppressed.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、追記型光ディスクや書換型光ディスクなど
の光学式情報記録ディスクに関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to optical information recording discs such as write-once optical discs and rewritable optical discs.

〔従来の技術〕[Conventional technology]

光学式情報記録ディスクは、第2図に示すように内面に
有機系色素膜や低融点金属膜あるいは光磁気記録膜より
なる記録層2′を構成した透明なプラスチック製の2枚
のディスク基板1’、1’を、内周スペーサー3′、外
周スペーサー4′を介してサンドインチ状に貼り合わせ
、これらディスク基板1′、1′の中心孔に磁性材料よ
りなるハブ部材5’、5’を固着して形成されており、
このハブ部材5’、5’をターンテーブルのマグネット
チャックに装着して回転使用される。
As shown in FIG. 2, an optical information recording disk consists of two transparent plastic disk substrates 1 each having a recording layer 2' made of an organic dye film, a low melting point metal film, or a magneto-optical recording film on the inner surface. ', 1' are pasted together in a sandwich shape via an inner circumferential spacer 3' and an outer circumferential spacer 4', and hub members 5', 5' made of a magnetic material are inserted into the center holes of these disk substrates 1', 1'. It is formed by sticking together,
These hub members 5', 5' are mounted on a magnetic chuck of a turntable and used for rotation.

ところで、上記ハブ部材をディスク基板に固着する手段
としては、かっては超音波融着、 UV接着、溶剤接着
等が用いられたが、これらは接着力に永続性がなく、タ
ーンテーブルへの装脱、回転速度の急変等のショ°ツク
によってハブ部材が脱落してしまう等の不利があった。
Incidentally, ultrasonic welding, UV adhesion, solvent adhesion, etc. were once used as means for fixing the hub member to the disc substrate, but these did not have a permanent adhesive force and were difficult to attach and remove from the turntable. However, there were disadvantages such as the hub member falling off due to shocks such as sudden changes in rotational speed.

このため、近年、この固着手段として第2図のように接
着剤によらず、上下一対のハブ部材5′。
For this reason, in recent years, a pair of upper and lower hub members 5' has been used as the fixing means, instead of using adhesive as shown in FIG.

5′にわたり、中心孔を囲んでネジ8′を螺挿し、この
ネジ8′の締付力により固定することが行なわれている
5', a screw 8' is screwed in surrounding the center hole, and the screw 8' is fixed by the tightening force of the screw 8'.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

しかし、上記ネジによる固定は、固着手段としては信頼
性の高いものであるが、ポリカーボネート等の光弾性定
数の大きいプラスチック板からなる一般のディスク基板
の場合は、ネジの締付による応力のために、ディスク基
板が部分的に変形して大きな複屈折が生じる不利がある
(第4図)。この複屈折は、基板の内周部で大きく、中
間部、外周部はほとんど影響されないが、記録領域の最
内周部に当る部分では信号振幅の低下、C/Nの低下等
に影響が現われてくる。
However, although fixing with screws is highly reliable as a means of fixing, in the case of general disk substrates made of plastic plates with a large photoelastic constant such as polycarbonate, the stress caused by tightening the screws , there is a disadvantage that the disk substrate is partially deformed and large birefringence occurs (FIG. 4). This birefringence is large at the inner periphery of the substrate, and is almost unaffected at the middle and outer periphery, but at the innermost periphery of the recording area, it is affected by a reduction in signal amplitude, a reduction in C/N, etc. It's coming.

本来、記録層面には情報を読み出し、または追加記録あ
るいは書き換えするために光ビームスポットを案内する
溝が設けられており、この案内溝に光ビームスポットを
沿わせることにより情報の記録、再生、書き換えが行わ
れるのであって、この案内溝は、例えば1.6碑という
ような微小間隔で同心円状または渦巻状に形成されてい
るものであるから、上記のようにして生ずるディスク基
板のわずかの変形でも大きな影響を及ぼすことになる。
Originally, grooves are provided on the surface of the recording layer to guide the light beam spot in order to read, add to, or rewrite information.By aligning the light beam spot along this guide groove, information can be recorded, reproduced, and rewritten. Since the guide grooves are formed concentrically or spirally at minute intervals, such as 1.6 mm, the slight deformation of the disk substrate caused by the above-mentioned But it will have a big impact.

本発明はこのような従来技術の欠点を解消するためにな
されたもので、ネジ止めによる応力によって発生する複
屈折の影響を極力小さくし、信頼性の高い光学式情報記
録ディスクを提供することを目的とする。
The present invention has been made in order to eliminate such drawbacks of the conventional technology, and aims to provide a highly reliable optical information recording disk by minimizing the influence of birefringence caused by stress caused by screw fastening. purpose.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するため、本発明によれば、片面に記録
層が形成された2枚のディスク基板を記録層が内側にな
るようにスペーサーを介して又は介さずに貼り合わせる
とともに、貼り合わされたディスク基板の上下外面に、
一体の磁性材料からなりボス部に連なるフランジ部を有
する一対のハブ部材を、それぞれボス部をディスク基板
の中心孔に嵌挿しかつこれらボス部をネジで相互に締付
して止着固定して構成される光学式情報記録ディスクに
おいて、これらハブ部材のディスク基板外面に重なるフ
ランジ部内面を、予ボス部つけ根に適度の輪状段部を残
して切込し、ディスク基板外面との間に若干の間隙を介
在させてなることを特徴とする光学式情報記録ディスク
が提供される。
In order to achieve the above object, according to the present invention, two disk substrates each having a recording layer formed on one side are bonded together with or without a spacer so that the recording layer is on the inside, and On the top and bottom outer surfaces of the disk board,
A pair of hub members made of an integral magnetic material and each having a flange portion connected to a boss portion are inserted into the center hole of a disk substrate, and the boss portions are fastened together by screwing them together with screws. In the optical information recording disk configured, the inner surface of the flange portion of these hub members that overlaps the outer surface of the disk substrate is cut leaving a moderate ring-shaped step at the base of the pre-boss portion, and a slight gap is formed between the inner surface of the flange portion and the outer surface of the disk substrate. An optical information recording disc characterized by having a gap therebetween is provided.

〔作用〕[Effect]

この発明では、上記一対のハブ部材を、そのターンテー
ブルに装着すべき取付面の大きさ、つまりディスク基板
の外面に露われでいる部分を、外形、寸法等は従来と変
えることなく、その代りに上記部分の裏面、つまりディ
スク基板外面に接している部分を、できるだけ中心孔に
近い部分を残して切削し、ディスク基板外面との間に間
隙を介在させておくことにより、ネジの締付力に対する
応力の発生が極力ディスク基板の記録領域からはずれる
ようになり、応力に起因する複屈折の影響が防止され、
信頼性の高いものとなる。
In this invention, the size of the mounting surface to be attached to the turntable of the pair of hub members, that is, the portion exposed on the outer surface of the disk substrate, is replaced by the same size, external shape, dimensions, etc. as before. Then, cut the back side of the above part, that is, the part that is in contact with the outer surface of the disk substrate, leaving a part as close to the center hole as possible, and leave a gap between it and the outer surface of the disk substrate to reduce the tightening force of the screw. The generation of stress on the disk is kept as far away from the recording area of the disk substrate as possible, and the effects of birefringence caused by stress are prevented.
It becomes highly reliable.

〔実施例〕〔Example〕

この発明の実施例を第1図を参照して説明すると、同図
において、■、1は透明プラスチック円板よりなるディ
スク基板、2,2はその内面に構成された記録層、3は
内周スペーサー、4は外周スペーサー、5,5はハブ部
材であって、磁性材料であるステンレス鋼(SUS43
0)で作られ、ボス部6に連なるフランジ部7を有し、
このボス部6をディスク基板1,1の中心孔に嵌挿する
とともに、それぞれのフランジ部7,7にわたってネジ
8を挿通締付し、上下からディスク基板1,1を挾んで
一体に固定されている。これらハブ部材5,5のフラン
ジ部外面には従来と同じく位置固定用の係合孔(図示せ
ず)が設けられている。
An embodiment of the present invention will be described with reference to FIG. 1. In the figure, 1 is a disk substrate made of a transparent plastic disc, 2 is a recording layer formed on the inner surface thereof, and 3 is an inner periphery. A spacer, 4 is an outer periphery spacer, 5, 5 is a hub member made of stainless steel (SUS43), which is a magnetic material.
0) and has a flange part 7 connected to the boss part 6,
This boss portion 6 is inserted into the center hole of the disk substrates 1, 1, and the screws 8 are inserted and tightened across the respective flanges 7, 7, and the disk substrates 1, 1 are sandwiched from above and below and fixed together. There is. The outer surfaces of the flange portions of these hub members 5, 5 are provided with engagement holes (not shown) for position fixing, as in the prior art.

ここまでは、前記第2図に示した従来の装置と同様であ
るが、この発明においては上記ハブ部材5.5は、それ
ぞれフランジ部7の内面を、予めボス部6つけ根に適度
の輪状段部9を残して切込し、ディスク基板1外面との
間に若干の間隙10を介在させた構造となっている。す
なわち、ハブ部材5,5はそれぞれ3つの半径の異なる
円板を大きい順に順次同心に積み上げた形状をなし、中
心部に同心の穴を有している。そして一番車さい円板に
相当する部分がディスク基板1,1の中心孔に嵌合し、
二番目に大きい円板に相当する面がディスク基板1.1
の表面に当接している。
Up to this point, it is the same as the conventional device shown in FIG. It has a structure in which the cut is made leaving a portion 9 and a slight gap 10 is interposed between it and the outer surface of the disk substrate 1. That is, each of the hub members 5, 5 has a shape in which three disks having different radii are stacked concentrically in descending order of size, and each has a concentric hole in the center. Then, the part corresponding to the smallest disc fits into the center hole of the disc substrates 1, 1,
The surface corresponding to the second largest disk is the disk substrate 1.1
is in contact with the surface of

なお、ハブ部材5,5′にはネジ止め用の貫通穴やパリ
よけの溝が形成されるとともに、面取り等が施されてい
る。
The hub members 5, 5' are provided with through holes for screwing and grooves to prevent burrs, and are chamfered.

上記構成においては、上下一対のハブ部材5,5がボス
部6、輪状段部9、フランジ部7からなる一見、径の異
なる3個の円板を重ねた形状に作られ、ディスク基板1
外面に対する圧接が輪状段部9だけによる局部接触とし
て行われているから、ネジ8の締付力は輪状段部9を介
してディスク基板1の記録領域外である中心孔周縁に限
られ、さらに仮にネジ8の締付に若干の不均衡があって
、上下一対のハブ部材5,5が相互に傾いた場合でも、
ターンテーブルに対する取付面である所定径のフランジ
部7の傾きは、間隙1oに吸収され、ディスク基板1゜
1に変形を生じるおそれがない。
In the above configuration, the pair of upper and lower hub members 5, 5 are made in the shape of three disks having different diameters, which at first glance appear to be stacked, consisting of a boss portion 6, an annular step portion 9, and a flange portion 7, and the disk substrate 1
Since the pressure contact with the outer surface is made as a local contact only by the annular step 9, the tightening force of the screw 8 is limited to the periphery of the center hole outside the recording area of the disk substrate 1 via the annular step 9, and furthermore, Even if there is a slight imbalance in the tightening of the screws 8 and the pair of upper and lower hub members 5, 5 are tilted relative to each other,
The inclination of the flange portion 7 having a predetermined diameter, which is the mounting surface for the turntable, is absorbed by the gap 1o, and there is no risk of deformation of the disk substrate 1°1.

この結果、記録領域の最内周部の複屈折は第3図に示す
ように小さくなり、信号振幅の低下は極度に減少する。
As a result, the birefringence at the innermost circumference of the recording area becomes small as shown in FIG. 3, and the drop in signal amplitude is extremely reduced.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、ハブ部材をボス部、輪状段部及びフラ
ンジ部からなる、径の異なる3個の円板を重ねた形状と
したので、ハブ部材とディスク基板の接する面が極力中
心孔近傍に限られるため。
According to the present invention, the hub member has a shape in which three discs with different diameters are stacked, each consisting of a boss part, an annular step part, and a flange part, so that the contact surface between the hub member and the disc substrate is as close to the center hole as possible. Because it is limited to.

ネジ止めによる応力のために発生する複屈折が抑制され
、信号振幅の低下を非常に小さくできる。
Birefringence that occurs due to stress caused by screwing is suppressed, and the drop in signal amplitude can be minimized.

したがって、信頼性の向上した光学式情報記録ディスク
が提供できる。
Therefore, an optical information recording disc with improved reliability can be provided.

【図面の簡単な説明】[Brief explanation of drawings]

第1図はこの発明の実施例に係る光学式情報記録ディス
クの縦断面図、第2図は従来の光学式情報記録ディスク
の縦断面図、第3図は本発明に使用されるハブ部材(半
径30■)の締付トルクによりディスク基板に生じる複
屈折の変化を示すグラフ、第4図は第2図のハブ部材(
半径30mm)の締付トルクによりディスク基板に生じ
る複屈折の変化を示すグラフである。 1・・・ディスク基板   2・・・記録層5・・・ハ
ブ部材 7・・・フランジ部 9・・・輪状段部 6・・・ボス部 8・・・ネジ 10・・・間隙 特許出願人 株式会社 リ  コ
FIG. 1 is a vertical cross-sectional view of an optical information recording disk according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of a conventional optical information recording disk, and FIG. 3 is a hub member ( Figure 4 is a graph showing the change in birefringence that occurs in the disk substrate due to the tightening torque at a radius of 30 cm.
3 is a graph showing a change in birefringence caused in a disk substrate by a tightening torque with a radius of 30 mm. DESCRIPTION OF SYMBOLS 1... Disk substrate 2... Recording layer 5... Hub member 7... Flange portion 9... Annular step portion 6... Boss portion 8... Screw 10... Gap Patent applicant Rico Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] (1)片面に記録層が形成された2枚のディスク基板を
記録層が内側になるようにスペーサーを介して又は介さ
ずに貼り合わせるとともに、貼り合わされたディスク基
板の上下外面に、一体の磁性材料からなりボス部に連な
るフランジ部を有する一対のハブ部材を、それぞれボス
部をディスク基板の中心孔に嵌挿しかつこれらボス部を
ネジで相互に締付して止着固定して構成される光学式情
報記録ディスクにおいて、これらハブ部材のディスク基
板外面に重なるフランジ部内面を、予ボス部つけ根に適
度の輪状段部を残して切込し、ディスク基板外面との間
に若干の間隙を介在させてなることを特徴とする光学式
情報記録ディスク。
(1) Two disk substrates with a recording layer formed on one side are bonded together with or without a spacer so that the recording layer is on the inside, and an integrated magnetic A pair of hub members made of a material and having a flange portion connected to a boss portion are each inserted into a center hole of a disk substrate, and these boss portions are fastened together by screws. In optical information recording disks, the inner surface of the flange portion of these hub members that overlaps the outer surface of the disk substrate is cut leaving a moderate ring-shaped step at the base of the pre-boss portion, and a slight gap is interposed between it and the outer surface of the disk substrate. An optical information recording disc characterized by:
JP2148410A 1990-06-06 1990-06-06 Optical information recording disk Pending JPH0440682A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2148410A JPH0440682A (en) 1990-06-06 1990-06-06 Optical information recording disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2148410A JPH0440682A (en) 1990-06-06 1990-06-06 Optical information recording disk

Publications (1)

Publication Number Publication Date
JPH0440682A true JPH0440682A (en) 1992-02-12

Family

ID=15452169

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2148410A Pending JPH0440682A (en) 1990-06-06 1990-06-06 Optical information recording disk

Country Status (1)

Country Link
JP (1) JPH0440682A (en)

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