JPH0433556Y2

JPH0433556Y2 -

Info

Publication number: JPH0433556Y2
Application number: JP1986190052U
Authority: JP
Priority date: 1986-12-10
Filing date: 1986-12-10
Publication date: 1992-08-11
Also published as: JPS6396622U

Description

【考案の詳細な説明】 (イ) 産業上の利用分野本考案は、レーザ光等の光及び熱エネルギーを
用いて情報を記録及び再生できる情報記録媒体に
関する。[Detailed description of the invention] (a) Industrial application field The present invention relates to an information recording medium that can record and reproduce information using light such as laser light and thermal energy.

(ロ) 従来の技術レーザ光等のエネルギービームを照射して基板
上の記録膜を溶融、蒸発させてピツトを形成し、
情報を記録する情報記録媒体では、記録膜を保護
するため、第３図の断面斜視図に示すようにサン
ドイツチ構造（特開昭57−172551号公報）とな
る。記録膜３１が積層形成された２枚の透明基板
３２は、記録膜３１を対向する配置でリング状の
内側スペーサ３３及び外側スペーサ３４を介して
同心的に接着され、各記録膜３１の間にエアーギ
ヤツプ３５が形成される。(b) Conventional technology The recording film on the substrate is melted and evaporated by irradiation with an energy beam such as a laser beam to form pits.
In order to protect the recording film, an information recording medium for recording information has a Sanderch structure (Japanese Unexamined Patent Publication No. 172551/1983) as shown in the cross-sectional perspective view of FIG. The two transparent substrates 32 on which the recording films 31 are laminated are concentrically adhered via a ring-shaped inner spacer 33 and an outer spacer 34 with the recording films 31 facing each other. An air gap 35 is formed.

従つて、記録膜３１は、完全に外部と遮断され
て塵埃から保護されると共に傷が発生することも
ない。 Therefore, the recording film 31 is completely isolated from the outside, protected from dust, and is free from scratches.

斯る構成では、透明基板３２はかなりの大径で
あることから、その自重により基板３２に大きな
反りまたはうねりが生じる。 In such a configuration, since the transparent substrate 32 has a considerably large diameter, the substrate 32 is largely warped or undulated due to its own weight.

そこで、本出願人は実開昭61−72726号公報に
より第４図に示す如き改良された情報記録媒体を
提案している。即ち、この情報記録媒体は記録膜
４１が形成されている２枚の透明基板４２と、基
板４２と略同一の外径を有するリング部材４３
と、このリング部材４３の内径より小径の円板部
材４４とを同心的に配置して、透明基板４２の内
周部及び外周部で円板部材４４及びリング部材４
３を固着している。このリング部材４３と円板部
材４４との間にはこれらに跨つてリング部材４３
に取付けられて円板部材４４の外周端部を摺動可
能に支持したピン４５を設けており、これにより
情報記録媒体の反り、うねりの発生を大幅に抑制
している。この場合も、各透明基板４２の間にエ
アーギヤツプ４６が形成され、記録膜４１を保護
している。 Therefore, the present applicant proposed an improved information recording medium as shown in FIG. 4 in Japanese Utility Model Application Publication No. 72726/1983. That is, this information recording medium includes two transparent substrates 42 on which recording films 41 are formed, and a ring member 43 having approximately the same outer diameter as the substrates 42.
and a disk member 44 having a smaller diameter than the inner diameter of the ring member 43 are arranged concentrically so that the disk member 44 and the ring member 4
3 is fixed. A ring member 43 is disposed between the ring member 43 and the disc member 44.
A pin 45 is attached to and slidably supports the outer peripheral end of the disc member 44, thereby greatly suppressing the occurrence of warping and waviness of the information recording medium. In this case as well, an air gap 46 is formed between each transparent substrate 42 to protect the recording film 41.

(ハ) 考案が解決しようとする問題点ところで、上述の情報記録媒体のいずれにおい
ても、エアギヤツプ３５，４６は外部空間に対し
て完全に密閉された空間である。従つて、エアー
ギヤツプ３５，４６内の気圧に対して外気圧が変
化すると、透明基板３２，４２に反りが発生して
しまう。(c) Problems to be Solved by the Invention Incidentally, in any of the above-mentioned information recording media, the air gaps 35 and 46 are spaces completely sealed from the outside space. Therefore, if the outside air pressure changes with respect to the air pressure inside the air gaps 35, 46, the transparent substrates 32, 42 will warp.

そこで本考案の目的は、気圧変化による反りを
防止することにある。 Therefore, the purpose of the present invention is to prevent warping due to changes in atmospheric pressure.

(ニ) 問題点を解決するための手段本考案の情報記録媒体は、そのスペーサが記録
膜が形成された２枚の基板の外周端部に固着され
たリング部材と、該リング部材の内径より小径で
上記基板の中央内部とのみ接触して固着された円
板部材とから成り、更に上記リング部材と円板部
材とに跨つて配され、かつ上記リング部材に固着
され上記円板部材を摺動可能に保持した筒状部材
を備えたことを特徴とする。(d) Means for Solving the Problems The information recording medium of the present invention includes a ring member in which the spacer is fixed to the outer circumferential ends of two substrates on which recording films are formed, and a spacer formed from the inner diameter of the ring member. a small-diameter disk member that is fixed in contact with only the central interior of the substrate; and a disk member that is arranged astride the ring member and the disk member, and that is fixed to the ring member and slides on the disk member. It is characterized by comprising a movably held cylindrical member.

(ホ) 作用本考案によれば、リング部材と円板部材とに跨
つて配された筒状部材の中心孔を通して、記録媒
体のエアーギヤツプは外部と連なつており、エア
ーギヤツプ内の気圧は外部気圧の変化に追従して
変化する。(E) Effect According to the present invention, the air gap of the recording medium is connected to the outside through the center hole of the cylindrical member disposed astride the ring member and the disc member, and the air pressure inside the air gap is equal to the external air pressure. changes according to changes in

(ヘ) 実施例第１図及び第２図は本考案の一実施例を示す要
部断面図である。記録膜１が積層形成された２枚
の円板状透明基板２は、該基板と略同一の外径を
有するリング部材３と、該リング部材の内径より
小さい径を有する円板部材４とを挾持し、これら
各部材３，４をスペーサとして記録膜１を内側に
して互いに同心的に固定されている。円板部材４
は、透明基板２と接着される中央部を除いて肉薄
とされ、記録膜１と接触しないようになされると
共に、エアーギヤツプ５が形成されている。(F) Embodiment FIGS. 1 and 2 are sectional views of essential parts showing an embodiment of the present invention. The two disk-shaped transparent substrates 2 on which the recording film 1 is laminated have a ring member 3 having approximately the same outer diameter as the substrates, and a disk member 4 having a diameter smaller than the inner diameter of the ring member. These members 3 and 4 are used as spacers and are fixed concentrically to each other with the recording film 1 facing inside. Disc member 4
is thin except for the central portion where it is bonded to the transparent substrate 2 so as not to come into contact with the recording film 1, and an air gap 5 is formed therein.

筒状のピン６は、一端がリング部材３に形成さ
れた孔に嵌着固定され、他端が円板部材４の外周
端から中心方向へピン６の径より若干大径に穿た
れた穴７に挿入され、円板部材４を摺動自在に保
持する。 The cylindrical pin 6 has one end fitted and fixed into a hole formed in the ring member 3, and the other end a hole drilled from the outer peripheral end of the disc member 4 toward the center with a diameter slightly larger than the diameter of the pin 6. 7 and holds the disc member 4 slidably.

なお、ピン６は外径２mm程度であり、中心孔の
径は0.5mm程度である。 Note that the pin 6 has an outer diameter of about 2 mm, and the diameter of the center hole is about 0.5 mm.

而して斯る構成によれば、リング部材３、円板
部材４及び両者間に跨つて配されたピン６によ
り、透明基板２の機械的強度は強くなる。また、
円板部材４の膨張は、円板部材４がピン６に対し
て摺動自在に取り付けられていることからリング
部材３から透明基板２に伝わらない。以上から、
透明基板部２の反りは防止される。 According to this configuration, the mechanical strength of the transparent substrate 2 is increased by the ring member 3, the disc member 4, and the pin 6 disposed between them. Also,
The expansion of the disc member 4 is not transmitted from the ring member 3 to the transparent substrate 2 because the disc member 4 is slidably attached to the pin 6. From the above,
Warpage of the transparent substrate portion 2 is prevented.

更に、ピン６を通して、透明基板２の間に形成
されたエアーギヤツプ５は、円板部材４の穴７と
ピン６との〓間からピン６の中心孔を通じて外部
と連なつている。従つて、エアーギヤツプ５内の
気圧は外部気圧の変動に追従して変化し、透明基
板２の膨張、収縮は抑制される。 Furthermore, the air gap 5 formed between the transparent substrates 2 through the pin 6 is connected to the outside through the center hole of the pin 6 from between the hole 7 of the disc member 4 and the pin 6. Therefore, the air pressure inside the air gap 5 changes in accordance with fluctuations in the external air pressure, and the expansion and contraction of the transparent substrate 2 is suppressed.

ところで、外部の塵埃は、ピン６の中心孔を通
して穴７内に侵入するものの、ピン６と穴７との
間にほとんど〓間がないことからそれ以上の侵入
が妨げられ、エアーギヤツプ５内へほとんど侵入
しない。従つて、記録膜１は従来例と同様に塵埃
から保護される。 Incidentally, although external dust enters into the hole 7 through the center hole of the pin 6, since there is almost no gap between the pin 6 and the hole 7, further entry is prevented, and almost no dust enters the air gap 5. Don't invade. Therefore, the recording film 1 is protected from dust as in the conventional example.

この点、リング部材３に単に孔を形成した場
合、孔を通じて外部からエアーギヤツプ５内に塵
埃が容易に侵入するため好ましくない。 In this regard, it is not preferable to simply form holes in the ring member 3 because dust can easily enter the air gap 5 from the outside through the holes.

(ト) 考案の効果本考案によれば、透明基板の自重や円板部材の
膨張のみならず外部気圧の変化に対して、透明基
板の反り発生を抑制することができ、良好な情報
記録媒体とすることができる。(g) Effects of the invention According to the invention, it is possible to suppress the occurrence of warping of the transparent substrate not only due to its own weight and expansion of the disc member, but also due to changes in external atmospheric pressure, and a good information recording medium can be obtained. It can be done.

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

第１図及び第２図は本考案の一実施例の要部を
示す断面図、第３図は従来例を示す断面斜視図、
第４図は改良された従来例の要部を示す断面図で
ある。２……透明基板、３……リング部材、４……円
板部材、６……ピン。 1 and 2 are cross-sectional views showing essential parts of an embodiment of the present invention, and FIG. 3 is a cross-sectional perspective view showing a conventional example.
FIG. 4 is a sectional view showing the main parts of an improved conventional example. 2...Transparent substrate, 3...Ring member, 4...Disc member, 6...Pin.

Claims

【実用新案登録請求の範囲】[Scope of utility model registration request]

２枚の基板をスペーサを介して同心的に対向配
置し、上記基板の対向面の少なくとも一方に情報
記録膜を形成した情報記録媒体において、上記ス
ペーサは、上記基板の外周端部に固着されたリン
グ部材と、該リング部材の内径より小径で上記基
板の中央内部とのみ接触して固着された円板部材
とから成り、更に上記リング部材と円板部材とに
跨つて配され、かつ上記リング部材に固着され上
記円板部材を摺動可能に保持した筒状部材を備え
たことを特徴とする情報記録媒体。 In an information recording medium in which two substrates are arranged concentrically facing each other with a spacer interposed therebetween, and an information recording film is formed on at least one of the opposing surfaces of the substrates, the spacer is fixed to an outer peripheral edge of the substrate. It consists of a ring member, and a disc member having a smaller diameter than the inner diameter of the ring member and is fixed in contact with only the center inside of the substrate, and is further disposed astride the ring member and the disc member, and An information recording medium comprising a cylindrical member fixed to a member and slidably holding the disc member.