JP2003331561A - Optical disk driving stabilizing apparatus and optical disk apparatus - Google Patents
Optical disk driving stabilizing apparatus and optical disk apparatusInfo
- Publication number
- JP2003331561A JP2003331561A JP2002134229A JP2002134229A JP2003331561A JP 2003331561 A JP2003331561 A JP 2003331561A JP 2002134229 A JP2002134229 A JP 2002134229A JP 2002134229 A JP2002134229 A JP 2002134229A JP 2003331561 A JP2003331561 A JP 2003331561A
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- JP
- Japan
- Prior art keywords
- optical disk
- optical
- stabilizing
- optical disc
- sheet
- 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.)
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- Optical Head (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、可撓性を有するシ
ート状の光学的情報記録媒体である光ディスクを回転駆
動させる際に、その回転軸方向の振れを、ベルヌーイの
法則による空気流の圧力差を生起させることによって安
定化させる光ディスク駆動安定化装置、およびその光デ
ィスク駆動安定化装置を搭載して光ディスクの記録面に
対して光学的に書込および／または読取を行う光ディス
ク装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection of an optical disc, which is a flexible sheet-like optical information recording medium, in a rotational axis direction when the optical disc is rotationally driven by the pressure of an air flow according to Bernoulli's law. The present invention relates to an optical disk drive stabilizing device that stabilizes by causing a difference, and an optical disk device that mounts the optical disk drive stabilizing device and optically writes and / or reads on a recording surface of an optical disk.
【０００２】[0002]
【従来の技術】近年、テレビ放送のデジタル化が始まる
など、大容量のデジタルデータを記録することが光ディ
スクに求められている。光ディスクの高密度化に対応す
るための手法のうち、基本的な方法は記録／再生のため
の光スポット径を小さくすることである。このため、記
録／再生のために用いられる光の波長を短く、かつ対物
レンズの開口数ＮＡを大きくすることが有効である。光
の波長についてはＣＤ（compact disk）では近赤外光の
７８０ｎｍ、ＤＶＤ（digital versatile disk）では赤
色光の６５０ｎｍ近傍の波長が用いられている。最近、
青紫光の半導体レーザが開発され、今後は４００ｎｍ近
傍のレーザ光が使用されると予想される。2. Description of the Related Art In recent years, optical discs have been required to record a large amount of digital data as the digitization of television broadcasting has started. Among the methods for coping with the high density of optical discs, the basic method is to reduce the light spot diameter for recording / reproduction. Therefore, it is effective to shorten the wavelength of light used for recording / reproduction and increase the numerical aperture NA of the objective lens. Regarding the wavelength of light, near infrared light of 780 nm is used for CD (compact disk), and red light of 650 nm is used for DVD (digital versatile disk). Recently,
A blue-violet semiconductor laser has been developed, and it is expected that a laser beam near 400 nm will be used in the future.
【０００３】また、対物レンズについては、ＣＤ用はＮ
Ａ０.５未満であったが、ＤＶＤ用はＮＡ０.６程度であ
る。今後、さらに開口数（ＮＡ）を大きくしてＮＡ０.
７以上とすることが求められる。Regarding the objective lens, N for CD
Although it was less than A0.5, NA for DVD is about 0.6. In the future, NA will be increased by increasing the numerical aperture (NA).
It is required to be 7 or more.
【０００４】しかし、対物レンズのＮＡを大きくするこ
と、および光の波長を短くすることは、光を絞るときに
収差の影響が大きくなることでもある。したがって、光
ディスクのチルトに対するマージンが減ることになる。
また、ＮＡを大きくすることによって焦点深度が小さく
なるため、フォーカスサーボ精度を上げなくてはならな
い。However, increasing the NA of the objective lens and shortening the wavelength of light also increase the influence of aberration when the light is focused. Therefore, the margin for tilting the optical disc is reduced.
In addition, since the depth of focus decreases as the NA increases, the focus servo accuracy must be increased.
【０００５】さらに、高ＮＡの対物レンズを使用するこ
とによって、対物レンズと光ディスクの記録面との距離
が小さくなってしまうため、光ディスクの面ぶれを小さ
くしておかないと、始動時のフォーカスサーボを引き込
む直前、対物レンズと光ディスクとが衝突することがあ
り、ピックアップの故障の原因となる。Further, since the distance between the objective lens and the recording surface of the optical disk becomes small by using the objective lens having a high NA, the focus servo at the time of start must be made unless the surface deviation of the optical disk is kept small. The objective lens may collide with the optical disc immediately before the optical pickup is pulled in, which causes a failure of the pickup.
【０００６】短波長，高ＮＡの大容量光ディスクとし
て、例えばＯ ＰＬＵＳ Ｅ（ｖｏｌ．２０ Ｎｏ.２）の
１８３ページに示されているように、ＣＤと同程度に厚
く剛性の大きい基板に記録膜を成膜し、記録／再生用の
光を基板を通さずに、薄いカバー層内を通して記録膜に
対して記録／再生する構成のシステムが提案されてい
る。As a large-capacity optical disk with a short wavelength and a high NA, for example, as shown in page 183 of O PLUS E (vol. 20 No. 2), a recording film is formed on a substrate as thick and as rigid as a CD. There has been proposed a system having a structure in which a recording film is formed and recording / reproducing light is recorded / reproduced on / from a recording film through a thin cover layer without passing through the substrate.
【０００７】また、例えば特開平７−１０５６５７号公
報,特開平１０−３０８０５９号公報に記載されている
ように、平面をもつ安定化板上で可撓性を有する光ディ
スクを回転させて、ベルヌーイの法則による空気力を利
用して光ディスクにおける面ぶれを安定化させようとす
る方法が知られている。Further, as described in, for example, Japanese Patent Application Laid-Open Nos. 7-105657 and 10-308059, a flexible optical disk is rotated on a stabilizing plate having a flat surface to produce a Bernoulli disk. There is known a method of stabilizing surface wobbling in an optical disk by utilizing aerodynamic force according to the law.
【０００８】また、本件出願人は、特願２００１−２２
８９４３号などにおいて、可撓性を有するシート状の光
ディスクの回転駆動時、少なくとも光ディスクにおける
書込あるいは読取が行われる部位における回転軸方向の
振れをベルヌーイの法則に基づく空気流の圧力差によっ
て安定化させる安定化手段を備えることを提案した。[0008] The applicant of the present invention filed Japanese Patent Application No. 2001-22.
No. 8943, when a flexible sheet-shaped optical disc is rotationally driven, at least a portion of the optical disc where writing or reading is performed is stabilized in the rotational axis direction by a pressure difference of an airflow based on Bernoulli's law. It has been proposed to provide a stabilizing means that makes it possible.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、前記従
来の技術において、光ディスクの基板を剛体で形成する
と、回転する光ディスクにおける面ぶれ,チルトを小さ
くするためには、きわめて正確な成形をし、かつ熱変形
が生じないように低温で記録膜を成膜しなければならな
い。このことは、光ディスク製造に係るタクトタイムを
長くすることになり、コストを上げる原因となる。However, in the above-mentioned conventional technique, when the substrate of the optical disc is formed of a rigid body, in order to reduce the surface run-out and tilt of the rotating optical disc, it is necessary to perform extremely accurate molding and heat treatment. The recording film must be formed at a low temperature so as not to cause deformation. This prolongs the tact time associated with the optical disc manufacturing, and causes a cost increase.
【００１０】また、変形する複雑な形状の可撓性を有す
る光ディスクと安定化手段間における空気流の圧力分布
は、単純なベルヌーイの法則の適用では求めることがで
きず、正確な流体計算をして光ディスクを安定化させる
ために適切な安定化手段の形状を求めなければならない
という問題もある。Further, the pressure distribution of the air flow between the optical disk having a deforming complex shape and flexibility and the stabilizing means cannot be obtained by applying the simple Bernoulli's law, and an accurate fluid calculation is performed. There is also a problem that an appropriate shape of the stabilizing means must be obtained in order to stabilize the optical disc.
【００１１】本発明の目的は、従来の課題を解決し、可
撓性を有する光ディスクと安定化手段間における気流に
よって光ディスク面に加えられる静圧場を考慮し、ディ
スク安定化に際して適切な形状を有する安定化手段を備
えた光ディスク駆動安定化装置、および光ディスク装置
を提供することにある。The object of the present invention is to solve the conventional problems and to take into consideration the static pressure field applied to the optical disk surface by the air flow between the flexible optical disk and the stabilizing means, and to provide an appropriate shape for disk stabilization. (EN) An optical disk drive stabilizing device including the stabilizing means having the above and an optical disk device.
【００１２】[0012]
【課題を解決するための手段】前記目的を達成するた
め、請求項１に記載の発明は、可撓性を有するシート状
の光ディスクを回転させる回転駆動手段と、光ディスク
の記録面とは反対面側に設置され、少なくとも光ディス
クにおける書込あるいは読取が行われる部位における回
転軸方向の振れを、空気流の圧力差を生起させることに
よって安定化させる安定化手段とを備え、この安定化手
段として光ディスク方向に突出する突出部材を用いた光
ディスク駆動安定化装置であって、前記突出部材におけ
る光ディスク方向に突出する方向の内部を中空状、ある
いは前記突出部材における光ディスク方向に突出する方
向の先端形状を凹状に形成したことを特徴とし、この構
成によって、可撓性を有するシート状の光ディスクの安
定化に際して適切な形状を有する安定化手段としての突
出部材の形状となり、ディスク回転駆動時における面ぶ
れを効果的に抑制することができる。In order to achieve the above-mentioned object, the invention according to claim 1 is a rotary drive means for rotating a flexible sheet-shaped optical disk, and a surface opposite to the recording surface of the optical disk. Is provided on the side of the optical disc, and at least a portion that performs writing or reading on the optical disc is stabilized by stabilizing the deflection in the direction of the rotation axis by causing a pressure difference in the air flow. An optical disk drive stabilizing device using a projecting member projecting in a direction, wherein the inside of the projecting member projecting in the optical disk direction is hollow, or the tip shape of the projecting member projecting in the optical disk direction is concave. This structure is suitable for stabilizing a flexible sheet-shaped optical disc. A shape of the projecting member as a stabilizing means having a Jo, can be effectively suppressed wobbling during disk rotation drive.
【００１３】請求項２に記載の発明は、請求項１記載の
光ディスク駆動安定化装置において、突出部材を複数個
設置したことを特徴とし、この構成によって、面ぶれの
少ない安定化する領域が複数箇所になるため、安定化が
より向上し、設計の自由度が増加することになる。According to a second aspect of the present invention, in the optical disk drive stabilizing device according to the first aspect, a plurality of projecting members are provided, and with this configuration, there are a plurality of stabilizing regions with less surface wobbling. Since it is located at a certain point, the stability is further improved and the degree of freedom in design is increased.
【００１４】請求項３に記載の発明は、請求項１記載の
光ディスク駆動安定化装置において、突出部材の中空状
あるいは凹状部分における開口面積を可変にする開口面
積可変手段を備えたことを特徴とし、この構成によっ
て、光ディスクの回転速度などの動作状況変化にも対応
して、動的に、より適切な安定化状態を創り出すことが
できる。According to a third aspect of the present invention, in the optical disk drive stabilizing apparatus according to the first aspect, an aperture area varying means for varying the aperture area in the hollow or concave portion of the protruding member is provided. With this configuration, it is possible to dynamically create a more appropriate stabilized state in response to changes in operating conditions such as the rotation speed of the optical disc.
【００１５】請求項４に記載の発明は、請求項１記載の
光ディスク駆動安定化装置において、突出部材の傾きを
光ディスクの対向面における法線に一致させるように可
変にする傾き可変手段を備えたことを特徴とし、この構
成によって、常に光ディスクと突出部材との対向面が略
平行になるため、光ディスクの回転速度などの動作状況
変化にも対応して、さらに動的に適切な安定化状態を創
り出すことができる。According to a fourth aspect of the present invention, in the optical disk drive stabilizing device according to the first aspect, there is provided tilt changing means for changing the tilt of the protruding member so as to match the normal of the facing surface of the optical disk. With this configuration, since the facing surfaces of the optical disk and the protruding member are always substantially parallel to each other, it is possible to dynamically and appropriately stabilize the optical disk in response to changes in operating conditions such as the rotational speed of the optical disk. Can be created.
【００１６】請求項５に記載の発明は、請求項１〜４い
ずれか１項記載の光ディスク駆動安定化装置において、
突出部材を光ディスクにおける両面にそれぞれ設置した
ことを特徴とし、この構成によって、突出部材の作用が
より安定することになるため、設計の自由度が大きくな
る。According to a fifth aspect of the present invention, in the optical disk drive stabilizing device according to any one of the first to fourth aspects,
It is characterized in that the projecting members are provided on both sides of the optical disk respectively. With this configuration, the action of the projecting members becomes more stable, and thus the degree of freedom in design is increased.
【００１７】請求項６に記載の発明は、可撓性を有する
シート状の光ディスクを回転させる回転駆動手段と、光
ディスクの記録面に対して光学的に書込および／または
読取を行う光ピックアップと、光ディスクの記録面とは
反対面側に設置され、少なくとも光ディスクにおける書
込あるいは読取が行われる部位における回転軸方向の振
れを、空気流の圧力差を生起させることによって安定化
させる安定化手段とを備え、この安定化手段として光デ
ィスク方向に突出する突出部材を具備した光ディスク駆
動安定化手段を備えた光ディスク装置であって、前記光
ディスク駆動安定化装置として請求項１〜５いずれか１
項記載の光ディスク駆動安定化装置を搭載したことを特
徴とし、この構成によって、ディスク安定化に際して適
切な形状を有する安定化手段としての突出部材が搭載さ
れるため、ディスク回転駆動時における面ぶれを効果的
に抑制することができ、光ディスクの記録面に対する書
込および／または読取が安定して行われることになる。According to a sixth aspect of the present invention, there is provided a rotation driving means for rotating a flexible sheet-shaped optical disc, and an optical pickup for optically writing and / or reading on a recording surface of the optical disc. A stabilizing means that is installed on the side opposite to the recording surface of the optical disc and that stabilizes at least the wobbling in the rotation axis direction of the optical disc where writing or reading is performed by causing a pressure difference in the air flow. 6. An optical disk device comprising: an optical disk drive stabilizing means having a protruding member protruding in the optical disk direction as the stabilizing means, wherein the optical disk drive stabilizing apparatus is any one of claims 1 to 5.
The optical disk drive stabilizing device according to the item (1) is mounted, and with this configuration, a protruding member as a stabilizing means having an appropriate shape for stabilizing the disk is mounted, so that the surface wobbling at the time of disk rotation drive is eliminated. This can be effectively suppressed, and writing and / or reading on the recording surface of the optical disc can be stably performed.
【００１８】[0018]
【発明の実施の形態】以下、本発明の好適な実施形態に
ついて図面を参照しながら説明する。BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings.
【００１９】図１は本発明の実施形態における基本構成
を説明するための光ディスク駆動安定化装置の参考例を
示す斜視図であり、１は可撓性を有する光ディスクシー
ト、２は安定化手段としての突出部材である。FIG. 1 is a perspective view showing a reference example of an optical disk drive stabilizing device for explaining the basic structure of an embodiment of the present invention. Reference numeral 1 is a flexible optical disk sheet, and 2 is a stabilizing means. Is a protruding member.
【００２０】光ディスクシート１の基本構成は、図２に
示す断面図に示すような構成であって、光ディスクシー
ト１における記録層１ａの反対側となる基板１ｂが、突
出部材２に対向するように、回転駆動手段である図示し
ないスピンドルシャフトのチャッキング部にセットさ
れ、回転駆動される。The basic structure of the optical disk sheet 1 is as shown in the sectional view of FIG. 2, and the substrate 1b on the opposite side of the recording layer 1a in the optical disk sheet 1 faces the protruding member 2. It is set on a chucking portion of a spindle shaft (not shown) which is a rotation driving means, and is driven to rotate.
【００２１】光ディスクシート１の具体例を説明する。
本例では、基板１ｂにおいて可撓性を持たせるために
０.１ｍｍ程度の薄いシートを用いた。例えばポリエチ
レンテレフタレート製の厚さ８０μｍのシートに熱転写
で、スタンパのピッチが０.６μｍ、幅０.３μｍのグル
ーブを転写し、その後、スパッタリングでシート／Ａｇ
反射層を１２０ｎｍ／（ＺｒＯ2-Ｙ2Ｏ3）-ＳｉＯ2，７
ｎｍ／ＡｇＩｎＳｂＴｅＧｅ，１０ｎｍ／ＺｎＳ-Ｓｉ
Ｏ2，２５ｎｍ／Ｓｉ3Ｎ4の順番に成膜した。このシー
トにＵＶ樹脂をスピンコートし、紫外線照射で硬化させ
て厚さ５μｍの透明保護膜を形成し、さらに、このディ
スクを大口径のレーザ光で記録層１ａを溶融結晶化する
ことにより、反射率を上げたものを使用した。A specific example of the optical disk sheet 1 will be described.
In this example, a thin sheet of about 0.1 mm is used in order to give flexibility to the substrate 1b. For example, thermal transfer is applied to a sheet of polyethylene terephthalate having a thickness of 80 μm to transfer a groove having a stamper pitch of 0.6 μm and a width of 0.3 μm, and then sputtering the sheet / Ag.
The reflective layer is 120 nm / (ZrO 2 -Y 2 O 3 ) -SiO 2 , 7
nm / AgInSbTeGe, 10 nm / ZnS-Si
Films were formed in the order of O 2 , 25 nm / Si 3 N 4 . This sheet is spin-coated with UV resin and cured by ultraviolet irradiation to form a transparent protective film having a thickness of 5 μm. Further, this disk is melted and crystallized with a laser beam having a large diameter to reflect it. The one which raised the rate was used.
【００２２】図１には、光ディスクシートの回転によっ
て、突出部材２と回転する光ディスクシート１の間に生
じる気流の静圧の効果を計算した際に使用したモデルを
示しており、ここで、静圧とは光ディスクが流体によっ
てその表面の法線方向に受ける圧力を言う。ベルヌーイ
の法則に基づくディスク面ぶれの安定化の原理は、この
静圧とディスク変形によって生じた回復力と回転による
遠心力とが釣り合うことによって安定化するものと考え
られる。FIG. 1 shows a model used when calculating the effect of static pressure of the air flow generated between the protruding member 2 and the rotating optical disk sheet 1 by the rotation of the optical disk sheet. The pressure is the pressure applied to the optical disk by the fluid in the direction normal to the surface of the optical disk. It is considered that the principle of stabilizing the disc surface shake based on Bernoulli's law is stabilized by balancing the static pressure, the restoring force generated by the disc deformation, and the centrifugal force due to the rotation.
【００２３】光ディスクシート１は半径６０ｍｍでｚ軸
を中心として１０００ｒｐｍの速度で回転しており、実
験によって求められた形状に変形させている。参考例で
は突出部材２は、直径２０ｍｍの円柱状の形状をしてお
り、下端面が球形になっている。突出部材２である円柱
の高さ方向の軸はｚ軸と一致している。光ディスクシー
ト１と突出部材２との最近接距離は５０×１０-6ｍであ
る。なお、光ディスクシート１の変形形状はレーザー干
渉計によって、ディスク表面全体をスキャンし、各点に
おけるｚ座標を画像処理して求めた。流体計算はナビエ
ストークス式を時間定常，非圧縮，３次元条件下で解く
ことによって行った。The optical disk sheet 1 has a radius of 60 mm, is rotated about the z axis at a speed of 1000 rpm, and is deformed into a shape obtained by an experiment. In the reference example, the protruding member 2 has a cylindrical shape with a diameter of 20 mm, and the lower end surface is spherical. The axis in the height direction of the cylinder that is the projecting member 2 coincides with the z axis. The closest distance between the optical disk sheet 1 and the protruding member 2 is 50 × 10 −6 m. The deformed shape of the optical disk sheet 1 was determined by scanning the entire disk surface with a laser interferometer and image-processing the z coordinate at each point. The fluid calculation was performed by solving the Navier-Stokes equation under time-steady, incompressible, and three-dimensional conditions.
【００２４】図３は参考例のモデルをｚ軸における正の
方向（図における上方）から見たｘｙ平面の第１象限を
示している図である。突出部材２の中心は回転中心から
ｘ，ｙ方向にそれぞれ３０ｍｍの距離に位置している。
以後、流体計算の結果は、この方向から見た結果によっ
て示す。FIG. 3 is a diagram showing the first quadrant of the xy plane when the model of the reference example is viewed from the positive direction on the z axis (upper side in the figure). The centers of the projecting members 2 are located at a distance of 30 mm from the center of rotation in the x and y directions, respectively.
Hereinafter, the results of the fluid calculation will be shown by the results viewed from this direction.
【００２５】図４は本発明に係る光ディスク駆動安定化
装置の第１実施形態を説明するための斜視図であり、図
１に示す参考例と異なる構成は、突出部材４として中空
状の円柱体を使用した点である。また本実施形態におい
て、撓んで変形した光ディスクシート１の表面と突出部
材４の端面との最近接距離は５０×１０-6ｍに保つよう
にしている。FIG. 4 is a perspective view for explaining the first embodiment of the optical disk drive stabilizing device according to the present invention. The structure different from the reference example shown in FIG. Is the point that was used. Further, in this embodiment, the closest distance between the surface of the optical disc sheet 1 which is bent and deformed and the end face of the protruding member 4 is kept at 50 × 10 −6 m.
【００２６】図５は図４に示す中空状の円柱体からなる
突出部材４にて光ディスクシート１をガイドした本発明
の実施形態の場合における光ディスクシートが受ける静
圧場を示す。突出部材４の中空部４ａにおける半径を
９．５ｍｍ，６．０ｍｍ，２．０ｍｍ，０［ｍｍ］（中
空にしていない場合）とした４条件について解析を行っ
た結果である。FIG. 5 shows a static pressure field received by the optical disk sheet in the case of the embodiment of the present invention in which the optical disk sheet 1 is guided by the projecting member 4 composed of the hollow cylindrical body shown in FIG. It is the result of having analyzed about 4 conditions which set the radius in the hollow part 4a of the protrusion member 4 to 9.5 mm, 6.0 mm, 2.0 mm, and 0 [mm] (when not made hollow).
【００２７】図５において、ディスク表面が受ける静圧
の大きさを点密度にて示しており、中空部４ａの領域が
小さいほど静圧の変化が大きいことが分かる。各条件に
おける突出部材４の下端面における光ディスクシート１
が受ける力を、圧力を積分することにより求めた。In FIG. 5, the magnitude of the static pressure received by the disk surface is shown by point density, and it can be seen that the smaller the area of the hollow portion 4a, the greater the change in static pressure. The optical disc sheet 1 on the lower end surface of the protruding member 4 under each condition
The force received by was determined by integrating the pressure.
【００２８】また、中空部４ａの領域における最大最小
静圧の差などの実測値を（表１）に示す。Further, the measured values such as the difference between the maximum and minimum static pressures in the region of the hollow portion 4a are shown in (Table 1).
【００２９】[0029]
【表１】 [Table 1]
【００３０】このように全体として反発力たる静圧から
受ける力は殆ど変わらないが、静圧差は大きく違うこと
が分かった。すなわち、このような静圧差は、安定条件
からは不利に働く。この観点からは突出部材４はできる
だけ大きい径の中空状円柱体にした方が好ましい。As described above, it was found that the force received from the static pressure, which is the repulsive force, is almost unchanged as a whole, but the static pressure difference is greatly different. That is, such a static pressure difference works from a stable condition. From this point of view, it is preferable that the protruding member 4 be a hollow cylindrical body having a diameter as large as possible.
【００３１】上述の計算結果からはできるだけ中空にし
た方がディスク面安定化の観点からは有利であったが、
突出部材４の構造強度上、図４に示す例では、中空半径
ｒ＝６．０ｍｍに相当する円柱形状にしてあり、光ディ
スクシート１をスピンドルモータによって１０００ｒｐ
ｍで回転することで、突出部材４の下端面の領域に安定
化領域が形成された。この領域において、従来の記録／
再生装置に具備されているフォーカス・サーボ機能を設
けることなく、リード／ライト動作を行うことが可能に
なった。From the above calculation results, it was advantageous to make the hollow as hollow as possible from the viewpoint of stabilizing the disk surface.
In view of the structural strength of the projecting member 4, the example shown in FIG. 4 has a cylindrical shape corresponding to a hollow radius r = 6.0 mm, and the optical disc sheet 1 is driven by a spindle motor at 1000 rp.
By rotating at m, a stabilizing region was formed in the region of the lower end surface of the protruding member 4. In this area, conventional recording /
Read / write operations can now be performed without providing the focus / servo function provided in the playback device.
【００３２】図６に示すように、前記と同様な構成をな
す複数（図では２個を例示している）の突出部材４，４
を光ディスクシート１の回転軸ＬＯに対して互いに直角
方向に配置することが考えられる。この場合、各突出部
材４，４の中心ｏはそれぞれ、光ディスクシート１の回
転中心Ｏと等距離に配置されており、各突出部材４，４
の長軸Ｌｏが互いに平行となっている。このような設置
構成にすることで、面ぶれの少ない安定化領域が、突出
部材４，４の下端面側のみならず、突出部材４，４同士
の中間点付近にも生じることになり、このため設計の自
由度が増加する。As shown in FIG. 6, a plurality (two are illustrated in the figure) of the protruding members 4 and 4 having the same structure as described above.
It is conceivable to arrange the optical disc sheets 1 at right angles to the rotation axis LO of the optical disc sheet 1. In this case, the centers o of the projecting members 4 and 4 are arranged equidistantly from the rotation center O of the optical disc sheet 1, respectively.
The long axes Lo of are parallel to each other. With such an installation configuration, a stabilization region with less surface wobbling occurs not only on the lower end surface side of the projecting members 4 and 4, but also near the midpoint between the projecting members 4 and 4. Therefore, the degree of freedom in design increases.
【００３３】上述したように、突出部材４における中空
部４ａの領域の面積は大きいほど、下面の光ディスク面
は安定化されるが、突出部材４の構造強度的な問題が生
じる。そこで、光ディスクシート１の回転数が大きく安
定化状態を保つのが難しい条件にも動的に対応できるよ
うに、突出部材４の下面における中空となる面積を可変
にすることが望ましい。As described above, the larger the area of the region of the hollow portion 4a of the protruding member 4, the more stable the optical disk surface on the lower surface, but the structural strength of the protruding member 4 becomes a problem. Therefore, it is desirable to make the hollow area of the lower surface of the projecting member 4 variable so as to be able to dynamically respond to the condition that the number of rotations of the optical disk sheet 1 is large and it is difficult to maintain a stable state.
【００３４】そこで、例えば図７に示すように、突出部
材５の中空部５ａに、互いに周方向に摺動する複数の金
属製の羽根６ａからなる開口面積可変手段である絞り機
構６を設置し、各羽根６ａの内側にて形成される中心部
に任意の径の開口Ｓを形成することを可能にすることに
より、中空部５ａにおける外部に対する開口Ｓの面積を
可変にすることが考えられる。Therefore, as shown in FIG. 7, for example, a diaphragm mechanism 6 which is an opening area varying means composed of a plurality of metallic blades 6a sliding in the circumferential direction is installed in the hollow portion 5a of the projecting member 5. It is conceivable that the area of the opening S with respect to the outside in the hollow portion 5a can be made variable by making it possible to form the opening S having an arbitrary diameter in the central portion formed inside each blade 6a.
【００３５】図８に示す本実施形態の構成例では、複数
（図では２個を例示している）の突出部材４，４を光デ
ィスクシート１の両面から接近させ、安定化領域を作り
出している。両突出部材４，４の中心ｏは光ディスクシ
ート１の回転軸ＬＯと等距離になるように設置されてい
る。このような配置構成にすることにより、面ぶれの少
ない安定化領域が、突出部材４，４の下端面側のみなら
ず、突出部材４，４同士の中間点付近にも生じることに
なり、この領域でも読み書き可能領域ができるため、設
計の自由度が増加する。In the configuration example of this embodiment shown in FIG. 8, a plurality of (two in the figure) protruding members 4 and 4 are brought close to each other from both sides of the optical disk sheet 1 to create a stabilizing region. . The centers o of the projecting members 4 and 4 are installed so as to be equidistant from the rotation axis LO of the optical disk sheet 1. With such an arrangement configuration, a stabilization region with less surface wobbling occurs not only on the lower end surface side of the projecting members 4 and 4, but also near the midpoint between the projecting members 4 and 4. A readable / writable area is also formed in the area, which increases the degree of freedom in design.
【００３６】また上述したように、突出部材４を光ディ
スクシート１に近接させるほど、あるいは光ディスクシ
ート１の回転速度を増加させるほど、光ディスクシート
１の面上の流体から受ける力が大きくなる。このような
場合、光ディスクシート１の変形が大きくなり、空気の
流れ場が変化し静圧の最適発生条件が変わることがあ
る。そこで光ディスクシート１の変形に応じて、適切に
突出部材４の設置条件を変える機構が必要となる。As described above, the closer the protrusion member 4 is to the optical disc sheet 1, or the higher the rotation speed of the optical disc sheet 1, the greater the force received from the fluid on the surface of the optical disc sheet 1. In such a case, the deformation of the optical disk sheet 1 may be increased, the air flow field may change, and the optimum static pressure generation condition may change. Therefore, a mechanism that appropriately changes the installation condition of the protruding member 4 according to the deformation of the optical disc sheet 1 is required.
【００３７】突出部材４の設置条件を変える構成として
は様々考えられるが、最も簡単な機構として、光ディス
クシート１の変形に応じて突出部材４における光ディス
クシート１に向かう軸線の傾きを変化させ、常に光ディ
スクシート１上の安定化領域（リード／ライトが行われ
る領域）の法線と突出部材４の軸線（中心線）とを一致
させることが望ましい。図９は回転方向（この場合はｙ
軸方向）から構成全体を見た状態を示しており、回転速
度が増加すると、静圧効果が大きくなり微小にディスク
面は変形する。このとき傾き可変手段である傾斜角制御
装置７によって、突出部材４における光ディスクシート
１方向へ向かう軸線をディスク面上の法線に一致させる
ように、突出部材４の傾斜角度を制御する構成になって
いる。この例では、常に、突出部材４の下端面とディス
ク１の表面とを略平行にすることができ、設定当初の安
定化条件に近似した条件で動作することができる。There are various conceivable configurations for changing the installation condition of the protruding member 4, but the simplest mechanism is to change the inclination of the axis of the protruding member 4 toward the optical disk sheet 1 according to the deformation of the optical disk sheet 1, and always It is desirable that the normal line of the stabilization area (area where reading / writing is performed) on the optical disk sheet 1 and the axis line (center line) of the protruding member 4 be aligned. FIG. 9 shows the rotation direction (in this case y
The figure shows a state in which the entire configuration is viewed from the axial direction), and when the rotation speed increases, the static pressure effect increases and the disk surface is slightly deformed. At this time, the inclination angle control device 7 which is an inclination varying means controls the inclination angle of the protruding member 4 so that the axis line of the protruding member 4 toward the optical disk sheet 1 coincides with the normal line on the disk surface. ing. In this example, the lower end surface of the projecting member 4 and the surface of the disk 1 can always be made substantially parallel to each other, and the operation can be performed under conditions close to the stabilization conditions at the initial setting.
【００３８】次に図１０〜図１４を参照して、前記構成
の光ディスク駆動安定化装置を搭載した本発明に係る光
ディスク装置の実施形態について説明する。Next, with reference to FIGS. 10 to 14, an embodiment of an optical disk device according to the present invention, which is equipped with the optical disk drive stabilizing device having the above-described structure, will be described.
【００３９】図１０は光ディスク装置の第１実施形態の
要部の概略構成を示す構成図であり、８は、光ディスク
シート１に対して記録／再生を行うためレーザ光源（図
示せず）からレーザ光を出射させ、また反射光を受光し
て再生処理を行わせるための光ピックアップ、９は光ピ
ックアップ８をシーク制御するピックアップ駆動部、１
０は光ディスクシート１を回転駆動するスピンドルモー
タ（図示せず）のスピンドルシャフトであって、既述し
た光ディスク駆動安定化装置における中空状の安定化部
材である突出部材４を光ディスクシート１の基板１ｂ側
に近接させている。FIG. 10 is a block diagram showing a schematic structure of a main part of the first embodiment of the optical disk apparatus. Reference numeral 8 shows a laser from a laser light source (not shown) for recording / reproducing with respect to the optical disk sheet 1. An optical pickup for emitting light and receiving reflected light to perform reproduction processing. Reference numeral 9 is a pickup drive unit for controlling seek of the optical pickup 8.
Reference numeral 0 denotes a spindle shaft of a spindle motor (not shown) for rotationally driving the optical disc sheet 1, and a protruding member 4 which is a hollow stabilizing member in the optical disc drive stabilizing device described above is attached to the substrate 1b of the optical disc sheet 1. Close to the side.
【００４０】光ディスクシート１はスピンドルモータに
よってスピンドルシャフト１０を中心として一定回転数
で回転しており、光ディスクシート１における突出部材
４の設置側とは反対面における面ぶれの少ない安定化領
域において、光ピックアップ８によって情報の記録／再
生を行う。このようにして、安定的に記録／再生を行う
ことができる。The optical disc sheet 1 is rotated around the spindle shaft 10 by a spindle motor at a constant number of revolutions, and the optical disc sheet 1 is exposed to light in a stabilization area on the surface opposite to the side where the protruding member 4 is installed. Information is recorded / reproduced by the pickup 8. In this way, stable recording / reproducing can be performed.
【００４１】可撓性を有する光ディスクシート１に対し
て突出部材４を図示したように近接させて設置する。光
ディスクシート１はスピンドルモータによって一定回転
数で回転している。本例では突出部材４の設置側とは反
対側となる光ディスクシート１における面ぶれの少ない
記録面１ａの安定化領域に、光ピックアップレンズ８を
移動させて情報の記録を行う。突出部材４の中空状の構
造によって、既述したように、より広い安定化領域面が
得られるため、安定的な情報の記録を行うことができ
る。The protruding member 4 is placed close to the flexible optical disk sheet 1 as shown in the figure. The optical disk sheet 1 is rotated at a constant speed by a spindle motor. In this example, the optical pickup lens 8 is moved to a stable area of the recording surface 1a of the optical disk sheet 1 on the side opposite to the side where the protruding member 4 is installed, and the information is recorded. As described above, the hollow structure of the projecting member 4 allows a wider stabilization area surface to be obtained, so that stable information recording can be performed.
【００４２】図１１は光ディスク装置の第２実施形態の
要部の概略構成を示す構成図であり、この第２実施形態
が第１実施形態と異なる構成は、複数（図では２個を例
示している）の中空状の突出部材４，４を光ディスクシ
ート１の回転軸ＬＯに対してそれぞれ直角の位置になる
ように配置している点である。このような構成にするこ
とにより、面ぶれの少ない安定化領域が、突出部材４，
４の下端面近傍のみならず、突出部材４，４同士の中間
点付近にも生じることになり、設計の自由度が増加す
る。FIG. 11 is a block diagram showing a schematic structure of a main part of the second embodiment of the optical disk device. The second embodiment differs from the first embodiment in a plurality of (two in the figure are illustrated. That is, the hollow projecting members 4 and 4 are arranged at right angles to the rotation axis LO of the optical disk sheet 1. With such a configuration, the stabilizing region with less surface wobbling can be formed as the protruding member 4,
Not only in the vicinity of the lower end surface of 4, but also in the vicinity of the midpoint between the protruding members 4 and 4, the degree of freedom in design increases.
【００４３】図１２は光ディスク装置の第３実施形態の
要部の概略構成を示す構成図であり、この第３実施形態
が第１実施形態と異なる構成は、突出部材４における下
端面の開口面積を可変にした点であって、例えば図７に
て説明した絞り機構６を突出部材４における中空部４ａ
の下端部に設けている。このような構成にすることで中
空部４ａの容積を変化させることができるため、動的な
条件に対応することができる。FIG. 12 is a block diagram showing a schematic structure of a main part of the third embodiment of the optical disk device. The third embodiment is different from the first embodiment in that the opening area of the lower end surface of the projecting member 4 is different. Is a variable point. For example, the diaphragm mechanism 6 described with reference to FIG.
It is provided at the lower end of. With such a configuration, the volume of the hollow portion 4a can be changed, so that it is possible to cope with dynamic conditions.
【００４４】図１３は光ディスク装置の第４実施形態の
要部の概略構成を示す構成図であり、この第４実施形態
が第１実施形態と異なる構成は、複数（図では２個を例
示している）の突出部材４，４を光ディスクシート１の
両面にそれぞれ対向設置した点であって、このような構
成にすることで、面ぶれの少ない安定化領域が、各突出
部材４，４の下端面のみならず、突出部材４，４同士の
中間点付近にも生じることになり、設計の自由度が増加
する。FIG. 13 is a block diagram showing a schematic structure of a main part of the fourth embodiment of the optical disk apparatus. The structure of the fourth embodiment different from that of the first embodiment is a plurality (two are illustrated in the figure). The projecting members 4 and 4 in (1) are installed on both sides of the optical disk sheet 1 so as to face each other. With such a configuration, a stabilizing area with less surface wobbling is provided in each of the projecting members 4 and 4. This occurs not only on the lower end surface but also in the vicinity of the midpoint between the protruding members 4 and 4, increasing the degree of freedom in design.
【００４５】図１４は光ディスク装置の第５実施形態の
要部の概略構成を示す構成図であり、この第５実施形態
が第１実施形態と異なる構成は、突出部材４における光
ディスクシート１に対する傾きを可変にした点であっ
て、例えば図９にて説明した傾斜角制御装置７によって
突出部材４における光ディスクシート１方向へ向かう軸
線をディスク面の法線に一致させるように調整可能にし
ている。このような構成にすることで、光ディスクシー
ト１の回転速度に応じて適切に突出部材４の軸線の傾き
を変化させ、常に光ディスクシート１上の安定化領域
（リード／ライトが行われる領域）における法線方向と
突出部材４の軸線とを一致させることができる。FIG. 14 is a block diagram showing the schematic arrangement of the essential parts of the fifth embodiment of the optical disk apparatus. The fifth embodiment differs from the first embodiment in that the protrusion member 4 is tilted with respect to the optical disk sheet 1. Is variable, and for example, the tilt angle control device 7 described with reference to FIG. 9 can adjust the axis of the protruding member 4 toward the optical disc sheet 1 to match the normal line of the disc surface. With such a configuration, the inclination of the axis of the projecting member 4 is appropriately changed according to the rotation speed of the optical disc sheet 1, and the stabilization region (the region where reading / writing is performed) on the optical disc sheet 1 is always performed. The normal direction and the axis of the protruding member 4 can be aligned.
【００４６】このため、常に突出部材４の下端面と光デ
ィスクシート１の表面とが平行となり、常に、当初設定
のディスク安定化条件に近似した条件で動作する光ディ
スク装置が実現する。Therefore, the lower end surface of the projecting member 4 and the surface of the optical disk sheet 1 are always parallel to each other, and an optical disk device that always operates under conditions close to the initially set disk stabilizing conditions is realized.
【００４７】なお、前記実施形態の説明において、突出
部材には、円柱状にして内部に貫通孔を形成した中空状
の構成のものを説明したが、円柱状の下端面に凹状の窪
み部を形成することによっても同様な効果が得られる。
また突出部材の外形も断面円形の円柱でなく、断面多角
形の柱状体であってもよい。In the description of the above embodiment, the protruding member has a hollow structure in which a through hole is formed in the inside of the cylinder, but a concave recess is formed on the lower end surface of the cylinder. The same effect can be obtained by forming it.
Further, the outer shape of the projecting member may be a columnar body having a polygonal cross section instead of a circular column having a circular cross section.
【００４８】[0048]
【発明の効果】以上説明したように、本発明によれば、
可撓性を有する光ディスクの駆動時において、光ディス
クと安定化手段である突出部材との間の気流によって光
ディスク面に加えられる静圧場に対する考慮がなされ、
ディスク回転駆動時における面ぶれを効果的に抑制する
ことができる突出部材の形状、すなわち突出部材におい
て光ディスク方向に突出する方向の内部を中空状、ある
いは光ディスク方向に突出する方向の先端形状を凹状に
形成してなる光ディスク駆動安定化装置、およびこの光
ディスク駆動安定化装置を搭載することにより、可撓性
を有する光ディスクを用いて安定した記録／再生が行わ
れる光ディスク装置が実現する。As described above, according to the present invention,
At the time of driving a flexible optical disk, consideration is given to a static pressure field applied to the optical disk surface by the airflow between the optical disk and the projecting member that is the stabilizing means.
The shape of the projecting member capable of effectively suppressing surface wobbling during disk rotation driving, that is, the inside of the projecting member projecting in the direction of the optical disk is hollow, or the tip shape projecting in the direction of the optical disk is concave. By mounting the formed optical disc drive stabilizing device and the optical disc drive stabilizing device, an optical disc device capable of performing stable recording / reproduction using a flexible optical disc is realized.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の実施形態における基本構成を説明する
ための光ディスク駆動安定化装置の参考例を示す斜視図FIG. 1 is a perspective view showing a reference example of an optical disk drive stabilizing device for explaining a basic configuration in an embodiment of the present invention.
【図２】本実施形態における光ディスクシートの基本構
成を説明するための断面図FIG. 2 is a cross-sectional view for explaining the basic configuration of the optical disc sheet according to the present embodiment.
【図３】図１の参考例のモデルを平面方向から見た説明
図FIG. 3 is an explanatory view of the model of the reference example of FIG. 1 viewed from the plane direction.
【図４】本発明に係る光ディスク駆動安定化装置の第１
実施形態を説明するための斜視図FIG. 4 is a first optical disk drive stabilizing device according to the present invention.
Perspective view for explaining the embodiment
【図５】本実施形態の突出部材を用いた場合における光
ディスクシートの静圧場の解析例を示す図FIG. 5 is a diagram showing an example of analysis of a static pressure field of an optical disk sheet when the protruding member of this embodiment is used.
【図６】本実施形態の突出部材を２つ用いた場合を示す
説明図FIG. 6 is an explanatory view showing a case where two projecting members of this embodiment are used.
【図７】本実施形態の突出部材に絞り機構を設置した構
成例を示す説明図FIG. 7 is an explanatory diagram showing a configuration example in which a diaphragm mechanism is installed on the protruding member of the present embodiment.
【図８】本実施形態の突出部材を光ディスクシートの両
面にそれぞれ設置した場合を示す説明図FIG. 8 is an explanatory view showing a case where the projecting members of this embodiment are installed on both sides of an optical disc sheet, respectively.
【図９】本実施形態の突出部材に傾斜角制御装置を設置
した構成例を示す説明図FIG. 9 is an explanatory view showing a configuration example in which a tilt angle control device is installed on the protruding member of the present embodiment.
【図１０】本発明に係る光ディスク装置の第１実施形態
の要部の概略構成を示す構成図FIG. 10 is a configuration diagram showing a schematic configuration of a main part of a first embodiment of an optical disc device according to the present invention.
【図１１】本発明に係る光ディスク装置の第２実施形態
の要部の概略構成を示す構成図FIG. 11 is a configuration diagram showing a schematic configuration of a main part of a second embodiment of an optical disc apparatus according to the present invention.
【図１２】本発明に係る光ディスク装置の第３実施形態
の要部の概略構成を示す構成図FIG. 12 is a configuration diagram showing a schematic configuration of a main part of a third embodiment of an optical disk device according to the present invention.
【図１３】本発明に係る光ディスク装置の第４実施形態
の要部の概略構成を示す構成図FIG. 13 is a configuration diagram showing a schematic configuration of a main part of a fourth embodiment of an optical disk device according to the present invention.
【図１４】本発明に係る光ディスク装置の第５実施形態
の要部の概略構成を示す構成図FIG. 14 is a configuration diagram showing a schematic configuration of a main part of a fifth embodiment of an optical disc apparatus according to the present invention.
１ 光ディスクシート １ａ 記録層 １ｂ 基板 ４，５ 突出部材 ４ａ，５ａ 中空部 ６ 絞り機構 ７ 傾斜角制御装置 1 Optical disc sheet 1a recording layer 1b substrate 4,5 Projection member 4a, 5a hollow part 6 Aperture mechanism 7 Tilt angle control device
Claims (6)
回転させる回転駆動手段と、光ディスクの記録面とは反
対面側に設置され、少なくとも光ディスクにおける書込
あるいは読取が行われる部位における回転軸方向の振れ
を、空気流の圧力差を生起させることによって安定化さ
せる安定化手段とを備え、この安定化手段として光ディ
スク方向に突出する突出部材を用いた光ディスク駆動安
定化装置であって、前記突出部材における光ディスク方
向に突出する方向の内部を中空状、あるいは前記突出部
材における光ディスク方向に突出する方向の先端形状を
凹状に形成したことを特徴とする光ディスク駆動安定化
装置。1. A rotation driving means for rotating a flexible sheet-shaped optical disk, and a rotational axis direction at least at a portion of the optical disk where writing or reading is performed, the rotary driving means being provided on a surface opposite to a recording surface. An optical disk drive stabilizing device using a projecting member projecting in the direction of the optical disk as a stabilizing means, the stabilizing means stabilizing the vibration of the optical stream by causing a pressure difference in the air flow. An optical disk drive stabilizing device, wherein the inside of the member in the direction of protruding in the optical disk direction is hollow, or the tip shape of the protruding member in the direction of protruding in the optical disk is concave.
徴とする請求項１記載の光ディスク駆動安定化装置。2. The optical disk drive stabilizing device according to claim 1, wherein a plurality of the protruding members are provided.
における開口面積を可変にする開口面積可変手段を備え
たことを特徴とする請求項１記載の光ディスク駆動安定
化装置。3. The optical disk drive stabilizing device according to claim 1, further comprising opening area varying means for varying the opening area in the hollow or concave portion of the projecting member.
面における法線に一致させるように可変にする傾き可変
手段を備えたことを特徴とする請求項１記載の光ディス
ク駆動安定化装置。4. The optical disk drive stabilizing device according to claim 1, further comprising tilt changing means for changing the tilt of the projecting member so as to match the normal of the facing surface of the optical disk.
にそれぞれ設置したことを特徴とする請求項１〜４いず
れか１項記載の光ディスク駆動安定化装置。5. The optical disk drive stabilizing device according to claim 1, wherein the projecting members are provided on both sides of the optical disk.
回転させる回転駆動手段と、光ディスクの記録面に対し
て光学的に書込および／または読取を行う光ピックアッ
プと、光ディスクの記録面とは反対面側に設置され、少
なくとも光ディスクにおける書込あるいは読取が行われ
る部位における回転軸方向の振れを、空気流の圧力差を
生起させることによって安定化させる安定化手段とを備
え、この安定化手段として光ディスク方向に突出する突
出部材を具備した光ディスク駆動安定化手段を備えた光
ディスク装置であって、前記光ディスク駆動安定化装置
として請求項１〜５いずれか１項記載の光ディスク駆動
安定化装置を搭載したことを特徴とする光ディスク装
置。6. A rotation driving means for rotating a flexible sheet-shaped optical disk, an optical pickup for optically writing and / or reading on a recording surface of the optical disk, and a recording surface of the optical disk. The stabilizing means is provided on the opposite surface side and stabilizes at least a portion of the optical disk where writing or reading is performed in the rotational axis direction by causing a pressure difference of the airflow. 6. An optical disc drive comprising an optical disc drive stabilizing means having a protruding member protruding in the optical disc direction as the optical disc drive stabilizing device, wherein the optical disc drive stabilizing device according to claim 1 is mounted as the optical disc drive stabilizing device. An optical disk device characterized by the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002134229A JP4087639B2 (en) | 2002-05-09 | 2002-05-09 | Optical disc drive stabilization device and optical disc device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002134229A JP4087639B2 (en) | 2002-05-09 | 2002-05-09 | Optical disc drive stabilization device and optical disc device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003331561A true JP2003331561A (en) | 2003-11-21 |
| JP4087639B2 JP4087639B2 (en) | 2008-05-21 |
Family
ID=29696939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002134229A Expired - Fee Related JP4087639B2 (en) | 2002-05-09 | 2002-05-09 | Optical disc drive stabilization device and optical disc device |
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| Country | Link |
|---|---|
| JP (1) | JP4087639B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006107704A (en) * | 2004-09-08 | 2006-04-20 | Ricoh Co Ltd | Recording/reproducing apparatus and disk cartridge |
| JP2011034613A (en) * | 2009-07-30 | 2011-02-17 | Nippon Hoso Kyokai <Nhk> | Disk driving device |
-
2002
- 2002-05-09 JP JP2002134229A patent/JP4087639B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006107704A (en) * | 2004-09-08 | 2006-04-20 | Ricoh Co Ltd | Recording/reproducing apparatus and disk cartridge |
| JP2011034613A (en) * | 2009-07-30 | 2011-02-17 | Nippon Hoso Kyokai <Nhk> | Disk driving device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4087639B2 (en) | 2008-05-21 |
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