JPH0322659B2 - - Google Patents
Info
- Publication number
- JPH0322659B2 JPH0322659B2 JP58221215A JP22121583A JPH0322659B2 JP H0322659 B2 JPH0322659 B2 JP H0322659B2 JP 58221215 A JP58221215 A JP 58221215A JP 22121583 A JP22121583 A JP 22121583A JP H0322659 B2 JPH0322659 B2 JP H0322659B2
- Authority
- JP
- Japan
- Prior art keywords
- transparent substrate
- cylindrical
- cylindrical portion
- optical information
- information recording
- 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 - Lifetime
Links
- 239000000758 substrate Substances 0.000 claims description 95
- 230000003287 optical effect Effects 0.000 claims description 29
- 239000000853 adhesive Substances 0.000 claims description 28
- 230000001070 adhesive effect Effects 0.000 claims description 28
- 125000006850 spacer group Chemical group 0.000 description 20
- 230000002093 peripheral effect Effects 0.000 description 12
- 229920005668 polycarbonate resin Polymers 0.000 description 7
- 239000004431 polycarbonate resin Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000005361 soda-lime glass Substances 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
本発明は、レーザビームにより記録及び読み取
りを行う光情報記録媒体に関し、特にサンドイツ
チ型又はエアーサンドイツチ型に関するものであ
る。
従来、この種のガラス板、プラスチツク板等よ
りなる円板状透明基板（以下、「透明基板」とい
う。）側より記録層にレーザビームをレンズで集
光、照射し、局部的な光学的変化により約1μｍ
の直径でデータを記録し、またデータの読み取り
が、この光学的変化を読み出す方法で行われる光
情報記録媒体は、第１図に示すような構成となつ
ていた。すなわち、２枚の透明基板１，２上に記
録層３，４をそれぞれ被着し、その２枚の透明基
板１，２を記録層３，４が対向するように設置
し、その２枚の透明基板１，２の間にリング状内
側スペーサ５とリング状外側スペーサ６を挿入
し、それぞれ接着剤７，８により透明基板１，２
に固着したものがあつた。
しかしながら、従来の光情報記録媒体は、下記
のような欠点があつた。
(1) ２枚の透明基板１，２の穴９，１０の位置を
精度よく一致させることは非常に困難であり、
その結果偏心量が多くなる欠点があつた。この
結果、光情報記録媒体を高速回転させたとき、
異常振動が発生することがあつた。
(2) 光情報記録媒体をテーブル等に置くと、透明
基板の表面が直接テーブル等の面に触れるた
め、記録、再生の機能を低下させる微細な傷が
発生したり、ほこりや汚れが付くといつた欠点
があつた。
(3) さらに、従来の光情報記録媒体は、透明基板
１，２の特に内周端が容易に破損したり劣化す
る欠点があつた。
本発明は、前記のような欠点を除去するために
なされた構造を有する光情報記録媒体を提供する
ことを目的とする。すなわち、透明基板の孔周縁
表面部に加わる負荷を抑制して２枚の透明基板の
偏心量を低減することを第１の目的とし、次に、
各透明基板表面のレーザ光が通る領域の傷の発生
の防止及びほこりや汚れの付着の防止、また光情
報記録媒体の透明基板の損傷又は劣化の防止を目
的とする。
以下、本発明の実施例を第２図に基づき詳細に
説明する。
(1) 先ず、精密研磨を施した外径305mmφ、穴径
35mmφ、厚み1.2mm、偏心量10μｍのソーダライ
ムガラスの透明基板１，２上に、それぞれの裏
面に、Te等の記録層３，４を対向する位置に
約150Åの厚さで蒸着する（同図ａ）。
(2) 次に、円筒部１１１とその円筒部１１１の図
中下側開口端部に一方に外側に向かつて突出さ
せた突出部１１２を形成している例えば断面が
Ｌ字状の偏心保持具（例えば、ポリカーボネー
ト樹脂）１１の突出部１１２の陥部に接着剤１
２を充填する（同図ｂ）。尚、この陥部は、円
筒部１１１と、透明基板１に当接する当接端面
との間に溝を形成したものである。一方、円筒
部１３１とその円筒部１３１の一方に内側に向
かつて突出させた突出部１３２を形成している
例えば断面がＬ字状の第１の外側カバー（例え
ば、ポリカーボネート樹脂。）１３の突出部１
３２の陥部に接着剤１４を充填する（同図ｃ）。
尚、この陥部は円筒部１３１と透明基板１と当
接する当接端面との間に溝を形成したものであ
る。
ここで、前記偏心保持具１１の円筒部１１１
の内径d1は31mmφ、円筒部１１１の外径d2は
34.98mmφで加工精度は15μｍ、突出部１１２の
外径d3は51mmφ、突出部１１２の高さh1は１mm
及び偏心保持具１１の高さh2は4.4mmである。
また、前記第１の外側カバー１３の突出部１３
２の内径D1は96mmφ、円筒部１３１の内径D2
は305mmφ、円筒部１３１の外径D3は309mmφ
であり、突出部１３２の高さH1は１mm及び前
記の第１外側カバー１３の高さH2は４，４mm
である。
(3) 次に、前記偏心保持具１１を前記第１の外側
カバー１３の中心近傍に設け、そして前記保持
具１１の円筒部１１１に記録層３を図中上側に
して前記透明基板１の穴９を挿入して、前記突
出部１１２上に透明基板１を設置し、前記突出
部１１２，１３２の陥部に満たされた接着剤１
２，１４により前記偏心保持具と前記第１の外
側カバー１３に透明基板１を固着する。このと
き、偏心保持具１１の陥部に充填された接着材
１４は、共に陥部の開口部を透明基板１によつ
て遮蔽されることにより封止される。従つて、
透明基板１の表面に接着剤が漏洩することを防
止できる。
(4) 次に、断面が凸状のリング状内側スペーサ
（例えば、ポリカーボネート樹脂。厚み0.5mm。）
１５の下部陥部に接着剤１６を充填して、前記
偏心保持具１１の円筒部１１１に沿つて前記リ
ング状内側スペーサ１５を挿入し、前記透明基
板１の記録層３が被着している表面に固着す
る。この際、前記リング状内側スペーサ１５の
凸部を、前記偏心保持具１１の円筒部１１１の
外周面に接触させることで位置ぎめは容易に決
定できる。また、前記リング状内側スペーサ１
５と前記偏心保持具１１とも前記接着剤１６に
より固着する。同様に、断面が凸状のリング状
外側スペーサ（例えば、ポリカーボネート樹
脂、厚み0.5mm。）１７の下部陥部に接着剤１８
を充填して、前期リング状内側スペーサ１７の
凸部を、前記第１の外側カバー１３の円筒部１
３１の内周面に接触させることで、容易に位置
ぎめができ、前記接着剤１８によつて、前記透
明基板１、前記リング状外側スペーサ１７、前
記第１の外側カバー１３を固着する。
(5) 次に、前記リング状内側スペーサ１５と前記
リング状外側スペーサ１７のそれぞれの上部陥
部に、接着剤１９，２０を充填し、前記透明基
板２の記録層４が、前記透明基板１の記録層３
と対向するように、前記偏心保持具１１の円筒
部１１１に前記透明基板２の穴１０を差し込ん
で、前記透明基板２を挿入して前記接着剤１
９，２０により、前記透明基板２と前記第１の
外側カバー１３と前記リング状外側スペーサ１
７、又は前記透明基板２と前記偏心保持具１１
と前記リング状内側スペーサ１５とをそれぞれ
固着する。尚、このとき、後述する内側カバー
２１と第２の外側カバー２３を、各々、偏心保
持具１１と第１の外側カバー１３に配設できる
ように、円筒部１１１の図中上側開口端部及び
円筒部１３１の図中上側開口端部は透明基板２
の表面から突出している。
このように透明基板１の孔９と透明基板２の
孔１０とで構成される円柱空〓部に偏心保持具
１１の円筒部１１１を貫通させることにより、
双方の透明基板の偏心量を低減することができ
る。
(6) 次に、断面が例えばＬ字状のリング状の内側
カバー２１（例えば、ポリカーボネート樹脂）、
透明基板２、及び偏心保持具１１の円筒部１１
１の３者を固着する。前記内側カバー２１は、
前記円筒部１１１の突出した上側の開口端部の
外周面と透明基板２の表面とが成す角部を空〓
部を介して遮蔽するものである。この内側カバ
ーは、その空〓部に接着剤２２を充填し、且
つ、透明基板２に対面する当接端面を前記透明
基板２の表面に当接させた状態で前記偏心保持
具１１の円筒部１１１に配設されている。同様
に、断面が例えばＬ字状のリング状の第２の外
側カバー（例えば、ポリカーボネート樹脂）２
３の陥部に接着剤２４を充填して、前記透明基
板２、前記第１の外側カバー１３及び前記第２
の外側カバー２３を固着し、本実施例の光情報
記録媒体を形成する（同図ｄ）。このように接
着することにより、接着剤２２は内側カバー２
１の内周面、円筒部１１１の上部開口端部の外
周面、及び透明基板２の表面で形成される空〓
部に封入され、又、接着剤２４は第１及び第２
外側カバーの各内周面及び透明基板２の表面と
で形成される陥部に封入されている。従つて、
各接着剤が透明基板２の表面におけるレーザ光
が通過する領域に漏洩することを防止できる。
以上、本実施例の光情報記録媒体の構成につい
て説明したが、次に効果について説明する。本実
施例の光情報記録媒体は、各透明基板を偏心保持
具に接着剤によつて固着する際、透明基板表面の
孔の周縁表面部には接着剤が載置しているのみ
で、透明基板と当接する、内側カバーの当接端面
及び偏心保持具の突出部の当接端面は、共に前記
透明基板表面の孔の周縁表面部の外方に当接して
いる。このため、透明基板表面の孔の周縁表面部
に加わる負荷を軽減することができる。これは、
高速回転状態で使用される光情報記録媒体にとつ
ては損傷又は破損防止上多大な効果となる。何故
ならば、高速回転状態にある光情報記録媒体の透
明基板の孔の周縁部には極めて大きな集中応力が
発生しており、始めから透明基板の孔の周縁表面
部に大きな負荷が加わつた状態になつていると、
破損を促進させる要因となるためである。
又、接着剤は上述したように封止されているの
で、接着剤が透明基板表面のレーザ光が通る領域
に漏洩して、この基板上に付着した接着剤が再
生・記録の際、透明基板を通過するレーザ光の進
行を阻害することはない。
次に、落下による破損及び透明基板表面のキズ
防止効果を説明するために本実施例と、本実施例
から第１及び第２外側カバーを取りはずした変形
例と、従来例の光情報記録媒体（第１図）との比
較を表１に示す。ここで、透明基板の形状及び材
質、記録層の材質、膜厚及び成膜条件は同一であ
る。
The present invention relates to an optical information recording medium that performs recording and reading using a laser beam, and particularly relates to a Sanderch type or an Air Sanderch type. Conventionally, a laser beam is focused and irradiated onto the recording layer from the disk-shaped transparent substrate (hereinafter referred to as "transparent substrate") side made of this type of glass plate, plastic plate, etc. with a lens, and local optical changes are caused. Approximately 1μm
An optical information recording medium in which data is recorded with a diameter of 100 mm and data is read by a method of reading out this optical change has a structure as shown in FIG. That is, recording layers 3 and 4 are deposited on two transparent substrates 1 and 2, respectively, and the two transparent substrates 1 and 2 are placed so that the recording layers 3 and 4 face each other. A ring-shaped inner spacer 5 and a ring-shaped outer spacer 6 are inserted between the transparent substrates 1 and 2, and the transparent substrates 1 and 2 are attached with adhesives 7 and 8, respectively.
There was something stuck to it. However, conventional optical information recording media have the following drawbacks. (1) It is extremely difficult to precisely match the positions of the holes 9 and 10 in the two transparent substrates 1 and 2;
As a result, there was a drawback that the amount of eccentricity increased. As a result, when the optical information recording medium is rotated at high speed,
Abnormal vibrations sometimes occurred. (2) When an optical information recording medium is placed on a table, etc., the surface of the transparent substrate will come into direct contact with the surface of the table, etc., which may cause minute scratches that reduce recording and playback functions, or dust and dirt may accumulate. I had a lot of flaws. (3) Furthermore, conventional optical information recording media have the disadvantage that the transparent substrates 1 and 2, especially the inner peripheral edges, are easily damaged or deteriorated. An object of the present invention is to provide an optical information recording medium having a structure designed to eliminate the above-mentioned drawbacks. That is, the first purpose is to suppress the load applied to the surface of the hole periphery of the transparent substrate and reduce the eccentricity of the two transparent substrates, and second,
The purpose is to prevent the occurrence of scratches on the surface of each transparent substrate in the area through which the laser beam passes, to prevent the adhesion of dust and dirt, and to prevent damage or deterioration of the transparent substrate of the optical information recording medium. Hereinafter, embodiments of the present invention will be described in detail based on FIG. 2. (1) First, precision polished outer diameter 305mmφ, hole diameter
Recording layers 3 and 4 made of Te, etc., are vapor-deposited to a thickness of about 150 Å at opposing positions on the back surfaces of transparent substrates 1 and 2 made of soda lime glass, each having a diameter of 35 mm, a thickness of 1.2 mm, and an eccentricity of 10 μm. Diagram a). (2) Next, an eccentric holder having an L-shaped cross section, for example, has a cylindrical portion 111 and a protruding portion 112 that protrudes outward in one direction at the lower open end of the cylindrical portion 111 in the figure. (For example, polycarbonate resin) Apply adhesive 1 to the recessed part of the protrusion 112 of 11
2 (Figure b). Note that this recess is a groove formed between the cylindrical portion 111 and the abutting end surface that abuts the transparent substrate 1. On the other hand, a first outer cover (for example, polycarbonate resin) 13 having an L-shaped cross section forms a cylindrical portion 131 and a protruding portion 132 that protrudes inward from one of the cylindrical portions 131. Part 1
32 is filled with adhesive 14 (FIG. 3(c)).
Note that this recess is a groove formed between the cylindrical portion 131 and the abutting end surface that abuts the transparent substrate 1. Here, the cylindrical portion 111 of the eccentric holder 11
The inner diameter d 1 of the cylinder part 111 is 31 mmφ, and the outer diameter d 2 of the cylindrical part 111 is
The machining accuracy is 34.98 mmφ, 15 μm, the outer diameter d 3 of the protrusion 112 is 51 mmφ, and the height h 1 of the protrusion 112 is 1 mm.
And the height h2 of the eccentric holder 11 is 4.4 mm.
Further, the protruding portion 13 of the first outer cover 13
The inner diameter D 1 of 2 is 96 mmφ, the inner diameter D 2 of the cylindrical part 131
is 305mmφ, and the outer diameter D3 of the cylindrical part 131 is 309mmφ
The height H 1 of the protrusion 132 is 1 mm, and the height H 2 of the first outer cover 13 is 4.4 mm.
It is. (3) Next, the eccentric holder 11 is provided near the center of the first outer cover 13, and the recording layer 3 is placed in the cylindrical portion 111 of the holder 11 on the upper side in the figure, and the hole in the transparent substrate 1 is placed in the vicinity of the center of the first outer cover 13. 9, and place the transparent substrate 1 on the protrusion 112, and then insert the adhesive 1 filled into the recesses of the protrusion 112, 132.
2 and 14, the transparent substrate 1 is fixed to the eccentric holder and the first outer cover 13. At this time, the adhesive 14 filled in the recess of the eccentric holder 11 is sealed by shielding the opening of the recess with the transparent substrate 1. Therefore,
It is possible to prevent the adhesive from leaking onto the surface of the transparent substrate 1. (4) Next, a ring-shaped inner spacer with a convex cross section (for example, polycarbonate resin. Thickness 0.5 mm.)
15 is filled with an adhesive 16, the ring-shaped inner spacer 15 is inserted along the cylindrical portion 111 of the eccentric holder 11, and the recording layer 3 of the transparent substrate 1 is adhered thereto. Sticks to surfaces. At this time, the positioning can be easily determined by bringing the convex portion of the ring-shaped inner spacer 15 into contact with the outer peripheral surface of the cylindrical portion 111 of the eccentric holder 11. Further, the ring-shaped inner spacer 1
5 and the eccentric holder 11 are fixed together by the adhesive 16. Similarly, apply adhesive 18 to the lower recess of the ring-shaped outer spacer (for example, polycarbonate resin, thickness 0.5 mm) 17 with a convex cross section.
to fill the convex portion of the ring-shaped inner spacer 17 with the cylindrical portion 1 of the first outer cover 13.
By contacting the inner circumferential surface of 31, positioning can be easily performed, and the transparent substrate 1, the ring-shaped outer spacer 17, and the first outer cover 13 are fixed by the adhesive 18. (5) Next, the upper recesses of the ring-shaped inner spacer 15 and the ring-shaped outer spacer 17 are filled with adhesives 19 and 20, so that the recording layer 4 of the transparent substrate 2 recording layer 3 of
Insert the hole 10 of the transparent substrate 2 into the cylindrical portion 111 of the eccentric holder 11 so as to face the adhesive 1.
9 and 20, the transparent substrate 2, the first outer cover 13 and the ring-shaped outer spacer 1
7, or the transparent substrate 2 and the eccentric holder 11
and the ring-shaped inner spacer 15 are fixed to each other. At this time, the upper open end of the cylindrical portion 111 in the figure and The upper open end of the cylindrical part 131 in the figure is connected to the transparent substrate 2.
protrudes from the surface of By penetrating the cylindrical part 111 of the eccentric holder 11 into the cylindrical hollow part formed by the hole 9 of the transparent substrate 1 and the hole 10 of the transparent substrate 2 in this way,
The amount of eccentricity of both transparent substrates can be reduced. (6) Next, a ring-shaped inner cover 21 (for example, polycarbonate resin) having an L-shaped cross section,
Transparent substrate 2 and cylindrical portion 11 of eccentric holder 11
Fix the three parties in 1. The inner cover 21 is
The corner formed by the outer circumferential surface of the protruding upper open end of the cylindrical portion 111 and the surface of the transparent substrate 2 is empty.
It is intended to be shielded through a section. This inner cover fills the empty space with adhesive 22, and holds the cylindrical portion of the eccentric holder 11 with the abutting end face facing the transparent substrate 2 in contact with the surface of the transparent substrate 2. It is located at 111. Similarly, a ring-shaped second outer cover (for example, polycarbonate resin) 2 having an L-shaped cross section, for example.
3 is filled with adhesive 24, and the transparent substrate 2, the first outer cover 13 and the second
The outer cover 23 is fixed to form the optical information recording medium of this embodiment (FIG. 4(d)). By bonding in this way, the adhesive 22 is applied to the inner cover 2.
1, the outer peripheral surface of the upper opening end of the cylindrical portion 111, and the surface of the transparent substrate 2.
The adhesive 24 is encapsulated in the first and second parts.
It is sealed in a recess formed by each inner circumferential surface of the outer cover and the surface of the transparent substrate 2. Therefore,
It is possible to prevent each adhesive from leaking to the area on the surface of the transparent substrate 2 through which the laser beam passes. The configuration of the optical information recording medium of this embodiment has been described above, and the effects will now be described. In the optical information recording medium of this example, when each transparent substrate is fixed to an eccentric holder with an adhesive, only the adhesive is placed on the peripheral surface of the hole on the surface of the transparent substrate, and the transparent The contact end surface of the inner cover and the contact end surface of the protrusion of the eccentric holder that contact the substrate both contact the outer side of the peripheral surface of the hole on the surface of the transparent substrate. Therefore, the load applied to the peripheral surface portion of the hole on the surface of the transparent substrate can be reduced. this is,
For optical information recording media that are used under high speed rotation conditions, this is highly effective in preventing damage or breakage. This is because an extremely large concentrated stress is generated around the periphery of the hole in the transparent substrate of an optical information recording medium that is rotating at high speed, and a large load is applied to the periphery surface of the hole in the transparent substrate from the beginning. When I get older,
This is because it becomes a factor that promotes damage. In addition, since the adhesive is sealed as described above, the adhesive leaks into the area on the surface of the transparent substrate where the laser beam passes, and the adhesive adhered to this substrate becomes attached to the transparent substrate during playback/recording. does not impede the progress of the laser beam passing through. Next, in order to explain the effect of preventing damage due to dropping and scratches on the surface of the transparent substrate, we will explain this example, a modification in which the first and second outer covers are removed from this example, and a conventional optical information recording medium ( Table 1 shows a comparison with Figure 1). Here, the shape and material of the transparent substrate, the material of the recording layer, the film thickness, and the film forming conditions are the same.
【表】【table】
【表】
以上のとおり、本実施例は、従来の構造と比較
して、偏心量、落下により破損及び透明基板の表
面の微細な傷等とも優れている。ここで、本実施
例の光情報記録媒体において落下により破損が減
少するのは、２枚の透明基板を偏心保持具と内側
カバーとで挟持することにより、各透明基板の孔
の周縁部を偏心保持具の突出部及び内側カバーで
覆い保護しているためである。又、透明基板表面
の微細な傷等が減少しているのは、本実施例の光
情報記録媒体を机上に載置した場合、机に接触す
るのは少なくとも内側カバー又は偏心保持具の突
出部でり、机と透明基板表面とは離間しているた
めである。又、本実施例においては透明基板の損
傷又は破損防止効果を高めるために、第１及び第
２の外側カバーを２枚の透明基板に、その少なく
とも外周面を覆うように配設したが、上掲の表１
から第１及び第２の外側カバーは配設せずとも従
来構造のものより優れていることが判る。さら
に、本実施例では、前記偏心保持具の円筒部と前
記第１の外側カバーを用いて、透明基板、リング
状内側スペーサとリング状外側スペーサの位置を
決めるため、作業性は数段向上する。
以下、変形例について説明する。内側カバーは
偏心保持具の円筒部内径と内側カバーの内径とが
同一であつたが、これに限定されるものでなく、
単に透明基板２表面の孔１０の周縁表面部を覆
い、かつ偏心保持具に接するものであつてもよ
い。偏心保持具や第１の外側カバーの寸法は、実
施例１又は２の寸法に限らず、透明基板の大きさ
や重畳などにより適宜決定すればよい。次に、リ
ング状外側スペーサ及びリング状外側スペーサの
断面の形状は、実施例の形状に限定されるもので
はなく、スペーサの効果を有する形状であればよ
い。次に、下部の透明基板の底面から偏心保持具
の底面までの距離及び第１の外側カバーの底面ま
での距離が実質的に同一で、また、上部の透明基
板の上面から内側カバーの上面までの距離及び第
２の外側カバーの上面までの距離が実質的に同一
であるが、いずれか一方が実質的に等しい距離で
あれば、本発明の光情報記録媒体をターンテーブ
ル等に設置した場合実施例１と同様の効果を有す
る。次に、透明基板は、ソーダライムガラスに限
定されず他のガラスでもよく、また、PMMA樹
脂などの樹脂であつてもよい。
次に、偏心保持具、内側カバー、第１及び第２
の外側カバーの材質は、ポリカーボネート樹脂に
限らず、硬質塩化ビニール樹脂などの樹脂又は
Alのような金属であつてもよい。次に、ターン
テーブル等に本発明を設置したとき、滑り止めの
ために、例えば、偏心保持具の底面や第１の外側
カバーの底面にローレツト状、網目状、砂目状の
表面加工を施してもよい。さらに、２枚の透明基
板にそれぞれ記録層を被着した光情報記録媒体の
みでなく、記録層を被着した透明基板が１枚の光
情報記録媒体でも同様の効果を生ずる。
以上、本発明の光情報記録媒体によれば、透明
基板の孔周縁表面部に加わる負荷を抑制して２枚
の透明基板相互の偏心量を軽減することができる
ので、本発明の光情報記録媒体を高速回転させた
ときの異常回転を防止できると共に、透明基板の
孔周縁表面部の劣化を防止することができる。
又、各透明基板を接着する接着剤は、各々、偏
心保持具の陥部と内側カバーの空〓部に封入され
ているので、これら接着剤が透明基板の表面に漏
洩して透明基板表面のレーザ光が通る領域が汚れ
ることを防止できる。
更に、各透明基板の孔周縁表面部は、内側カバ
ー又は偏心保持具の突出部によつて覆われている
ことから、前記周縁表面部の損傷又は破損を防止
することができると共に、光情報記録媒体を載置
面に載置したとき、透明基板表面は載置面と離間
するので透明基板表面に傷が付いたり塵俟が付着
することを防止できる。[Table] As described above, this example is superior to the conventional structure in terms of eccentricity, damage caused by falling, and fine scratches on the surface of the transparent substrate. Here, the reason why the optical information recording medium of this example is less likely to be damaged by falling is that the two transparent substrates are held between the eccentric holder and the inner cover, so that the peripheral edge of the hole in each transparent substrate is This is because the protrusion of the holder and the inner cover cover and protect it. Moreover, the reason why fine scratches etc. on the surface of the transparent substrate are reduced is that when the optical information recording medium of this example is placed on a desk, at least the inner cover or the protrusion of the eccentric holder comes into contact with the desk. This is because the desk and the surface of the transparent substrate are separated from each other. Furthermore, in this example, in order to enhance the effect of preventing damage or damage to the transparent substrates, the first and second outer covers were disposed on the two transparent substrates so as to cover at least the outer peripheral surfaces thereof. Table 1 below
It can be seen from this that the structure is superior to that of the conventional structure even without the first and second outer covers. Furthermore, in this embodiment, the cylindrical portion of the eccentric holder and the first outer cover are used to determine the positions of the transparent substrate, the ring-shaped inner spacer, and the ring-shaped outer spacer, so the workability is improved by several steps. . Modifications will be described below. Although the inner diameter of the cylindrical portion of the eccentric holder and the inner diameter of the inner cover are the same, the present invention is not limited to this.
It may simply cover the peripheral surface of the hole 10 on the surface of the transparent substrate 2 and be in contact with the eccentric holder. The dimensions of the eccentric holder and the first outer cover are not limited to the dimensions of Embodiment 1 or 2, and may be determined as appropriate depending on the size of the transparent substrate, overlapping, etc. Next, the cross-sectional shapes of the ring-shaped outer spacer and the ring-shaped outer spacer are not limited to the shapes of the embodiments, but may be any shape that has the effect of a spacer. Next, the distance from the bottom surface of the lower transparent substrate to the bottom surface of the eccentric holder and the distance from the bottom surface of the first outer cover are substantially the same, and the distance from the top surface of the upper transparent substrate to the top surface of the inner cover is substantially the same. and the distance to the top surface of the second outer cover are substantially the same, but if either one is substantially the same distance, when the optical information recording medium of the present invention is installed on a turntable etc. It has the same effect as Example 1. Next, the transparent substrate is not limited to soda lime glass, but may be other glass, or may be made of resin such as PMMA resin. Next, the eccentric holder, the inner cover, the first and second
The material of the outer cover is not limited to polycarbonate resin, but also resin such as hard vinyl chloride resin or
It may also be a metal such as Al. Next, when the present invention is installed on a turntable or the like, for example, the bottom surface of the eccentric holder or the bottom surface of the first outer cover is treated with a knurled, meshed, or grained surface to prevent slipping. It's okay. Furthermore, the same effect can be obtained not only in an optical information recording medium in which two transparent substrates each have a recording layer attached thereto, but also in an optical information recording medium in which only one transparent substrate has a recording layer attached thereto. As described above, according to the optical information recording medium of the present invention, it is possible to suppress the load applied to the surface portion of the hole periphery of the transparent substrate and reduce the amount of eccentricity between the two transparent substrates. Abnormal rotation when the medium is rotated at high speed can be prevented, and deterioration of the hole peripheral surface portion of the transparent substrate can be prevented. In addition, since the adhesive for bonding each transparent substrate is sealed in the recess of the eccentric holder and the hollow part of the inner cover, these adhesives leak onto the surface of the transparent substrate and cause damage to the surface of the transparent substrate. It is possible to prevent the area through which the laser beam passes from becoming dirty. Furthermore, since the peripheral surface of the hole of each transparent substrate is covered by the inner cover or the protrusion of the eccentric holder, it is possible to prevent the peripheral surface from being damaged or broken, and to prevent optical information recording. When a medium is placed on the mounting surface, the surface of the transparent substrate is separated from the mounting surface, so that it is possible to prevent the surface of the transparent substrate from being scratched or having dust attached thereto.
第１図は従来の光情報記録媒体を示す断面図、
第２図は本発明の一実施例を示す断面図で、同図
ａは記録層を被着した２枚の透明基板の断面図、
同図ｂは偏心保持具の断面図、同図ｃは第１の外
側カバーの断面図、同図ｄは本発明の一実施例の
構造を示す断面図、同図ｅは前記同図ｄの部分拡
大断面図である。
１，２……透明基板、３，４……記録層、１１
……偏心保持具、１３……第１の外側カバー、１
５……リング状内側スペーサ、１７……リング状
外側スペーサ、２１……内側カバー、２３……第
２の外側カバー、１１１……偏心保持具の円筒
部、１１２……偏心保持具の突出部、１３１……
第１の外側カバーの円筒部、１３２……第１の外
側カバーの突出部。
FIG. 1 is a sectional view showing a conventional optical information recording medium.
FIG. 2 is a sectional view showing an embodiment of the present invention, and FIG.
Figure b is a cross-sectional view of the eccentric holder, Figure c is a cross-sectional view of the first outer cover, Figure d is a cross-sectional view showing the structure of an embodiment of the present invention, and Figure e is a cross-sectional view of the first outer cover. FIG. 3 is a partially enlarged sectional view. 1, 2... Transparent substrate, 3, 4... Recording layer, 11
... Eccentric holder, 13 ... First outer cover, 1
5...Ring-shaped inner spacer, 17...Ring-shaped outer spacer, 21...Inner cover, 23...Second outer cover, 111...Cylindrical part of eccentric holder, 112...Protrusion part of eccentric holder , 131...
Cylindrical portion of the first outer cover, 132...Protruding portion of the first outer cover.
Claims (1)
の透明基板の少なくとも一方の前記透明基板上に
レーザビームにより情報記録を行う記録層を設
け、前記２枚の透明基板を、前記記録層が前記２
枚の透明基板間に存するように配置し、さらに前
記２枚の透明基板の円柱状の空〓部を対向するよ
うに配置した光情報記録媒体において、 円筒部と、この円筒部の一方の開口端部に外側
に向かつて突出した突出部とを備え、該突出部に
おける一方の透明基板に当接する当接端面と前記
円筒部との間に陥部を設け、該陥部に該一方の透
明基板を接着する接着剤を充填した偏心保持具
を、前記円筒部の他方の開口端部が他方の透明基
板表面より突出するように前記円柱空〓部に挿入
し、 前記円筒部の突出した他方の開口端部の外周面
と他方の透明基板の表面とが成す角部を、空〓部
を介して遮蔽する内側カバーを、該空〓部に他方
の透明基板及び前記円筒部の他方の開口端部を接
着する接着剤を充填すると共に前記内側カバーの
他方の透明基板に対面する当接端面が前記他方の
透明基板に当接するように、前記円筒部の他方の
開口端部に設けたことを特徴とする光情報記録媒
体。 ２ 円筒部と該円筒部の一方の開口端部に内側に
向かつて突出した突出部とを備え、前記突出部の
一方の透明基板に対向する面に、該一方の透明基
板を接着する接着剤を充填した陥部を形成した第
１外側カバーを、該円筒部の内周面で透明基板の
外周面を覆うと共に、前記円筒部の他方の開口端
部が他方の透明基板表面より突出するように前記
２枚の透明基板に配設し、 他方の透明基板を接着する接着剤を陥部に充填
した第２の外側カバーを、前記陥部の開口部が他
方の透明基板表面に対向するように前記第１外側
カバーの円筒部の他方の開口端部に配設したこと
を特徴とする特許請求の範囲第１項記載の光情報
記録媒体。[Scope of Claims] 1. A recording layer for recording information using a laser beam is provided on at least one of the two transparent substrates each having a cylindrical hollow portion in the center thereof, The recording layer is made of two transparent substrates.
An optical information recording medium arranged between two transparent substrates and further arranged so that the cylindrical hollow parts of the two transparent substrates face each other, the optical information recording medium comprising: a cylindrical part; and an opening in one of the cylindrical parts. a protrusion protruding outwardly at the end, a recess is provided between the abutting end surface of the protrusion that abuts one of the transparent substrates and the cylindrical part; An eccentric holder filled with an adhesive for bonding the substrates is inserted into the hollow cylindrical part so that the other open end of the cylindrical part protrudes from the surface of the other transparent substrate, and the other open end of the cylindrical part protrudes from the surface of the other transparent substrate. An inner cover that shields the corner formed by the outer circumferential surface of the opening end of the opening end and the surface of the other transparent substrate through the hollow part is attached to the hollow part of the other transparent substrate and the other opening of the cylindrical part. The other open end of the cylindrical portion is filled with an adhesive for adhering the end portion, and is provided at the other open end of the cylindrical portion so that the contact end surface facing the other transparent substrate of the inner cover contacts the other transparent substrate. An optical information recording medium characterized by: 2. An adhesive comprising a cylindrical portion and a protruding portion protruding inward from one open end of the cylindrical portion, and bonding the one transparent substrate to the surface of the protruding portion facing the one transparent substrate. A first outer cover having a recessed portion filled with the cylindrical portion is arranged such that the inner circumferential surface of the cylindrical portion covers the outer circumferential surface of the transparent substrate, and the other open end of the cylindrical portion protrudes from the surface of the other transparent substrate. A second outer cover is placed on the two transparent substrates, and the recess is filled with an adhesive for bonding the other transparent substrate, so that the opening of the recess faces the surface of the other transparent substrate. 2. The optical information recording medium according to claim 1, wherein the optical information recording medium is disposed at the other open end of the cylindrical portion of the first outer cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58221215A JPS60113344A (en) | 1983-11-24 | 1983-11-24 | Optical information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58221215A JPS60113344A (en) | 1983-11-24 | 1983-11-24 | Optical information recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60113344A JPS60113344A (en) | 1985-06-19 |
| JPH0322659B2 true JPH0322659B2 (en) | 1991-03-27 |
Family
ID=16763265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58221215A Granted JPS60113344A (en) | 1983-11-24 | 1983-11-24 | Optical information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60113344A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03125349A (en) * | 1989-10-11 | 1991-05-28 | Pioneer Electron Corp | Optical information recording carrier |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57120243A (en) * | 1981-01-14 | 1982-07-27 | Matsushita Electric Ind Co Ltd | Optical information carrier disk and its manufacture |
-
1983
- 1983-11-24 JP JP58221215A patent/JPS60113344A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57120243A (en) * | 1981-01-14 | 1982-07-27 | Matsushita Electric Ind Co Ltd | Optical information carrier disk and its manufacture |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60113344A (en) | 1985-06-19 |
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