JP2000008642A - Base isolation device - Google Patents

Base isolation device

Info

Publication number
JP2000008642A
JP2000008642A JP10176028A JP17602898A JP2000008642A JP 2000008642 A JP2000008642 A JP 2000008642A JP 10176028 A JP10176028 A JP 10176028A JP 17602898 A JP17602898 A JP 17602898A JP 2000008642 A JP2000008642 A JP 2000008642A
Authority
JP
Japan
Prior art keywords
flat
flat plate
seismic isolation
plate
spherical surfaces
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.)
Withdrawn
Application number
JP10176028A
Other languages
Japanese (ja)
Inventor
Hiroshi Kurabayashi
浩 倉林
Daisuke Yaguchi
大輔 矢口
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.)
Mitsubishi Steel Mfg Co Ltd
Original Assignee
Mitsubishi Steel Mfg 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 Mitsubishi Steel Mfg Co Ltd filed Critical Mitsubishi Steel Mfg Co Ltd
Priority to JP10176028A priority Critical patent/JP2000008642A/en
Publication of JP2000008642A publication Critical patent/JP2000008642A/en
Withdrawn legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a small-sized base isolation device which can be installed in a narrow space between the upper and lower sides and can relieve a large vibration displacement. SOLUTION: This device is provided with a flat support body 19 on both faces of which protrusive spherical surfaces 17, 18 having the same radius are formed respectively, and two sheets of flat plates 13, 15 that recessed spherical surfaces 14, 16 which is smoothly transferable on the protrusive spherical surfaces 17, 18 are formed on the opposite faces and the protrusive spherical surfaces 17, 18 of the flat support body 19 are supported by the recessed spherical surfaces 14, 16. In this case, the protrusive spherical surfaces 17, 18 are covered with a rotary body 21, and a damper 23 is provided to make adjustable a pressing force to bring into contact with the opposite face of one flat plate fitted to the other opposite face.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、地震等の振動エネ
ルギーを遮断して、博物館の展示物、コンピュータ等の
免震対象物を振動の被害から守るための免震装置に関す
るものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device for shielding vibration energy such as an earthquake and protecting a seismic isolation target such as a museum exhibit or a computer from vibration.

【0002】[0002]

【従来の技術】従来から開発されている免震装置の一例
を、図5の縦断面図によって説明すると、基礎1上に取
り付けられている下面板2の上面には、中央部に対して
両端部がやや高くなるように縦方向にゆるやかに湾曲さ
せたX方向レール3が固定されており、振動の被害から
守る免震対象物4の下側には上面板5が取り付けられて
いて、上面板5の下面にはX方向レール3と直交する方
向に、中央部に対して両端部がやや低くなるように縦方
向にゆるやかに湾曲させたY方向レール6が固定されて
いる。
2. Description of the Related Art An example of a conventionally-developed seismic isolation device will be described with reference to a longitudinal sectional view of FIG. An X-direction rail 3 which is gently curved in the vertical direction so as to be slightly higher is fixed, and an upper surface plate 5 is attached to a lower side of the seismic isolation target 4 to be protected from vibration. On the lower surface of the face plate 5, a Y-direction rail 6 which is gently curved in the vertical direction so that both ends are slightly lower than the center in the direction orthogonal to the X-direction rail 3 is fixed.

【0003】X方向レール3とY方向レール6との間に
は連結ブロック7が配置されていて、連結ブロック7の
下部はボールベアリングを介してX方向レール3を長手
方向に移動自在に挟み、連結ブロック7の上部はボール
ベアリングを介してY方向レール6を長手方向に移動自
在に挟んでおり、下部と上部とはユニバーサルジョイン
トで結合されている。
A connecting block 7 is disposed between the X-direction rail 3 and the Y-direction rail 6, and a lower portion of the connecting block 7 movably sandwiches the X-direction rail 3 in a longitudinal direction via a ball bearing. The upper part of the connection block 7 movably sandwiches the Y-direction rail 6 in the longitudinal direction via a ball bearing, and the lower part and the upper part are connected by a universal joint.

【0004】図5の免震装置において、基礎1が横方向
に振動すると、連結ブロック7はX方向レール3に沿っ
て滑らかに変位すると共に、Y方向レール6をその長手
方向に滑らかに変位させるようになる。そして、X方向
レール3とY方向レール6とが縦方向にゆるやかに湾曲
しているため、免震対象物4や上面板5等の重力の分力
が復元力として作用し、免震対象物4は激しい横振動の
被害から守られるようになる。
In the seismic isolation device of FIG. 5, when the foundation 1 vibrates in the lateral direction, the connecting block 7 smoothly displaces along the X-direction rail 3 and also smoothly displaces the Y-direction rail 6 in its longitudinal direction. Become like Since the X-direction rail 3 and the Y-direction rail 6 are gently curved in the vertical direction, the component force of gravity of the seismic isolation target 4 and the upper surface plate 5 acts as a restoring force, and 4 will be protected from severe lateral vibration.

【0005】また従来の免震装置としては、X方向レー
ル3及びY方向レール6を縦方向に湾曲させずに直線レ
ールとし、X方向レール3及びY方向レール6にそれぞ
れ平行な引張バネの両端を下面板2と上面板5とに結合
し、引張バネの復元力を利用したものも開発されてい
る。
In a conventional seismic isolation device, the X-direction rail 3 and the Y-direction rail 6 are not bent in the vertical direction but are formed as straight rails, and both ends of a tension spring parallel to the X-direction rail 3 and the Y-direction rail 6, respectively. Are combined with the lower plate 2 and the upper plate 5 to utilize the restoring force of a tension spring.

【0006】図6は従来の免震装置の他の例の分解斜視
図であって、基礎の上に取り付ける下面板8の上面に凹
球面9を形成し、免震対象物の下側に取り付ける上面板
10の下面にも凹球面11を形成し、凹球面9,11に
球体12が当接するようにして、下面板8の上方に上面
板10を配置したものである。
FIG. 6 is an exploded perspective view of another example of the conventional seismic isolation device, in which a concave spherical surface 9 is formed on the upper surface of a lower plate 8 to be mounted on a foundation, and is mounted below a seismic isolation target. A concave spherical surface 11 is also formed on the lower surface of the upper surface plate 10, and the upper surface plate 10 is arranged above the lower surface plate 8 such that the spherical body 12 abuts against the concave spherical surfaces 9 and 11.

【0007】図6の免震装置は、球体12が凹球面9,
11のいずれの方向にも転動できるため、下面板8がど
の方向に横振動しても復元力が得られ、免震対象物は激
しい横振動の被害から守られるようになる。
[0007] In the seismic isolation device shown in FIG.
Since the lower plate 8 can roll in any direction, a restoring force can be obtained even if the lower plate 8 vibrates in any direction, and the seismic isolation target can be protected from severe lateral vibration damage.

【0008】[0008]

【発明が解決しようとする課題】X方向レール3及びY
方向レール6を縦方向にゆるやかに湾曲させた図5に示
す免震装置では、上面板5の変位できる距離はX方向レ
ール3及びY方向レール6の長さで決まってしまうた
め、小型の免震装置で大きな振動変位を緩和することは
困難であった。
The X-direction rails 3 and Y
In the seismic isolation device shown in FIG. 5 in which the direction rail 6 is gently curved in the vertical direction, the distance that the upper surface plate 5 can be displaced is determined by the lengths of the X-direction rail 3 and the Y-direction rail 6. It was difficult to mitigate large vibration displacement with the seismic device.

【0009】また、X方向レール3及びY方向レール6
を縦方向に湾曲させずに直線レールとし、引張バネの両
端を下面板2と上面板5とに結合して復元力を得る免震
装置では、下面板2と上面板5との間に引張バネを組み
込むため、免震装置の高さ寸法が大きくなって、上下の
間隔が狭い場所には設置できず、価格も高価になる問題
があった。
The X-direction rail 3 and the Y-direction rail 6
In a seismic isolation device that obtains a restoring force by connecting both ends of a tension spring to the lower surface plate 2 and the upper surface plate 5 without forming a straight rail without bending in the vertical direction, a tension is applied between the lower surface plate 2 and the upper surface plate 5. Since the spring is incorporated, the height of the seismic isolation device is increased, so that the device cannot be installed in a place where the space between the upper and lower parts is small, and there is a problem that the price is high.

【0010】さらに図6に示す免震装置は、下面板8と
上面板10とによって球体12を挟む構成のため、1個
の免震装置では免震対象物を水平状態に保持できず、少
なくとも3個以上の免震装置を設置する必要があって、
装置全体として小型化できず、価格も高価になる問題が
あった。
Further, the seismic isolation device shown in FIG. 6 has a configuration in which the sphere 12 is sandwiched between the lower surface plate 8 and the upper surface plate 10, so that a single seismic isolation device cannot hold the seismic isolation target in a horizontal state. It is necessary to install three or more seismic isolation devices,
There has been a problem that the size of the apparatus as a whole cannot be reduced, and the price increases.

【0011】本発明は、このような問題を解消し、小型
で上下の間隔が狭い場所に設置可能であり、大きな振動
変位を緩和することができる免震装置を提供することを
目的とするものである。
An object of the present invention is to provide a seismic isolation device which solves such a problem, can be installed in a small space with a small vertical space, and can reduce a large vibration displacement. It is.

【0012】[0012]

【課題を解決するための手段】本発明は、両面にそれぞ
れ同じ半径の凸球面が形成された偏平支持体と、前記凸
球面に対し滑らかに移動し得る凹球面が互いに対向する
面に形成され該凹球面で前記偏平支持体の凸球面を挟持
する2枚の平板とを備えた免震装置において、該凸球面
が転動体で覆われ、かつ一方の対向面に取付けられた他
方の平板の対向面に当接し得る圧接力を調整し得るダン
パを備えたことを特徴とする免震装置に係るもので、偏
平支持体の凸球面と2枚の平板の凹球面とが滑らかに移
動することにより、大きな振動変位を緩和することがで
き、免震装置の高さ寸法も小さくて済むようになる。
According to the present invention, a flat support having convex spheres having the same radius on both surfaces is formed, and concave spheres which can move smoothly with respect to the convex sphere are formed on surfaces facing each other. A seismic isolator comprising two flat plates sandwiching the convex spherical surface of the flat support with the concave spherical surface, wherein the convex spherical surface is covered with a rolling element, and the other flat plate attached to one of the opposing surfaces is provided. The present invention relates to a seismic isolation device having a damper capable of adjusting a pressure contact force capable of abutting an opposing surface, wherein a convex spherical surface of a flat support and a concave spherical surface of two flat plates move smoothly. Accordingly, large vibration displacement can be reduced, and the height of the seismic isolation device can be reduced.

【0013】凸球面が転動体で覆われているもので、偏
平支持体と2枚の平板とは極めて滑らかに変位し、大き
な振動変位を極めてスムーズに緩和するようになる。
Since the convex spherical surface is covered with rolling elements, the flat support and the two flat plates are very smoothly displaced, and large vibration displacement is relieved very smoothly.

【0014】一方の平板の対向面に取り付けられ他方の
平板の対向面に当接し得る加速度の下限を調整すること
ができるダンパを備えたことで、一方の平板が所定以上
の加速度で振動するまでは、他方の平板に対して免震機
能を抑止できるようになる。
By providing a damper attached to the opposing surface of one flat plate and capable of adjusting the lower limit of the acceleration that can abut the opposing surface of the other flat plate, one of the flat plates vibrates at a predetermined acceleration or more. Will be able to suppress the seismic isolation function for the other flat plate.

【0015】[0015]

【発明の実施の形態】以下、本発明の実施の形態を、図
に基づいて説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

【0016】図1は、本発明の実施の形態の一例の縦断
面であって、13は、図示しない基礎の上に取り付けら
れる平板を示しており、この平板13の上面には、曲率
半径の大きな凹球面14が形成されている。
FIG. 1 is a longitudinal sectional view of an embodiment of the present invention. Reference numeral 13 denotes a flat plate mounted on a foundation (not shown). A large concave spherical surface 14 is formed.

【0017】平板13の上方には、図示しない博物館の
展示物、コンピュータ等の免震対象物の下側に取り付け
られる平板15が配置されていて、上記の平板13と対
向する平板15の下面にも、上記の凹球面14と同じ曲
率半径の凹球面16が形成されている。
Above the flat plate 13, a flat plate 15 attached to the lower side of the seismic isolation target such as a museum exhibit or a computer (not shown) is arranged. Also, a concave spherical surface 16 having the same radius of curvature as the concave spherical surface 14 is formed.

【0018】下方にある平板13の凹球面14と、上方
にある平板15の凹球面16との間には、下面ならびに
上面の両面に凸球面17,18が形成されている偏平支
持体19が配置されている。
Between the concave spherical surface 14 of the lower flat plate 13 and the concave spherical surface 16 of the upper flat plate 15, a flat support 19 having convex spherical surfaces 17, 18 formed on both the lower surface and the upper surface is provided. Are located.

【0019】図2に示すように偏平支持体19の全表面
に小鋼球等の転動体21を多数配設し、偏平支持体19
の周囲には、リング状の抑え環22を取り付ける。
As shown in FIG. 2, a large number of rolling elements 21 such as small steel balls are arranged on the entire surface of the flat support 19,
, A ring-shaped holding ring 22 is attached.

【0020】上述した下方にある平板13の凹球面14
を外れた箇所の上面には、図1、図3に示すように、粘
性ゴム等のダンパ23が止めネジ24によって取り付け
られている。
The above-described concave spherical surface 14 of the lower flat plate 13
As shown in FIGS. 1 and 3, a damper 23 made of a viscous rubber or the like is attached by a set screw 24 to the upper surface of the portion where the gap has been removed.

【0021】図3は、ダンパ23が自由状態の時を示し
ていて、止めネジ24を締め付けたり緩めたりすること
により、ダンパ23の基部の圧縮状態を強くしたり弱く
したりして、自由状態のダンパ23先端部の平板13上
面に対する高さを変えることができるようになってい
る。
FIG. 3 shows a state in which the damper 23 is in a free state. The compression state of the base of the damper 23 is strengthened or weakened by tightening or loosening the set screw 24 so that the free state is achieved. The height of the tip of the damper 23 with respect to the upper surface of the flat plate 13 can be changed.

【0022】図3に示すダンパ23の自由状態に対し
て、図1に示すように偏平支持体19の上に平板15が
載置された状態では、ダンパ23の先端部が平板15の
下面に当接し、平板15及び平板15の上に取り付けら
れている免震対象物の重量により、ダンパ23は圧縮さ
れた状態になって、ダンパ23の先端部は平板15の下
面に圧接されるようになる。
In contrast to the free state of the damper 23 shown in FIG. 3, when the flat plate 15 is placed on the flat support 19 as shown in FIG. Due to the weight of the flat plate 15 and the seismic isolation target mounted on the flat plate 15, the damper 23 is in a compressed state, and the tip of the damper 23 is pressed against the lower surface of the flat plate 15. Become.

【0023】上述のように止めネジ24を締め付けたり
緩めたりして、自由状態のダンパ23先端部の平板13
上面に対する高さを変えておくことにより、平板15の
下面に対するダンパ23の圧接力を調整することができ
る。
By tightening or loosening the set screw 24 as described above, the flat plate 13 at the tip of the damper 23 in the free state is set.
By changing the height with respect to the upper surface, the pressing force of the damper 23 against the lower surface of the flat plate 15 can be adjusted.

【0024】次に、上述した装置の作用を説明する。Next, the operation of the above-described device will be described.

【0025】図示しない基礎の上に取り付けられている
下方の平板13が横振動を受けて横方に変位した場合、
上方にある平板15は、その上に取り付けてある図示し
ない免震対象物と共に、慣性で静止状態を維持しようと
する。
When the lower flat plate 13 mounted on a foundation (not shown) receives lateral vibration and is displaced laterally,
The flat plate 15 on the upper side, together with the seismically isolated object (not shown) mounted thereon, intends to maintain a stationary state by inertia.

【0026】ダンパ23の平板15下面に対する圧接力
は、下方の平板13が或る加速度以上の変位になった
時、初めて平板15が下方の平板13の変位に追従して
変位するようにさせる。平板15が変位し始める時の平
板13の加速度は、止めネジ24の締め付け状態を変え
ておくことにより、調整することができる。
The pressing force of the damper 23 against the lower surface of the flat plate 15 causes the flat plate 15 to be displaced following the displacement of the lower flat plate 13 for the first time when the lower flat plate 13 is displaced by a certain acceleration or more. The acceleration of the flat plate 13 when the flat plate 15 starts to be displaced can be adjusted by changing the tightening state of the set screw 24.

【0027】上述のダンパ23は、下方の平板13に取
り付けずに、上方の平板15の下面に取り付けてもよ
い。
The above-described damper 23 may be attached to the lower surface of the upper flat plate 15 instead of to the lower flat plate 13.

【0028】下方の平板13が大きな横振動を受ける
と、上方の平板15の片側は図4に示すようにダンパ2
3から外れて下方の平板13に対して変位し、偏平支持
体19は下方の平板13の凹球面14の周辺部に向かっ
て上がって行き、上方の平板15の凹球面16は、その
周辺部が偏平支持体19の上側に接するようになる。
When the lower flat plate 13 receives a large lateral vibration, one side of the upper flat plate 15 is placed on the damper 2 as shown in FIG.
3 and displaces with respect to the lower flat plate 13, the flat support 19 rises toward the periphery of the concave spherical surface 14 of the lower flat plate 13, and the concave spherical surface 16 of the upper flat plate 15 Comes into contact with the upper side of the flat support 19.

【0029】図2に示すように偏平支持体19の表面に
転動体21が配設されている免震装置の場合には、転動
体21が偏平支持体19の上側から下側へ、下側から上
側へと転動し、下方の平板13に対する偏平支持体19
の変位、並びに偏平支持体19に対する上方の平板15
の変位は、いずれも極めてスムーズに行われる。
As shown in FIG. 2, in the case of the seismic isolation device in which the rolling elements 21 are disposed on the surface of the flat supporting body 19, the rolling elements 21 are moved from the upper side of the flat supporting body 19 to the lower side. To the upper side, and the flat support 19 against the lower plate 13
And the upper plate 15 relative to the flat support 19
Are extremely smoothly performed.

【0030】上方の平板15が下方の平板13に対して
変位する際、上方の平板15の下方の平板13に対する
変位量が例えば200mmであると、上方の平板15と
偏平支持体19との変位量は100mm、偏平支持体1
9と下方の平板13との変位量は100mmとなり、従
って上方の平板15は、下方の平板13の振動変位量に
対し、2倍の変位量で振動を緩和することができること
になり、小型で大きな振動変位を緩和することができ
る。
When the upper flat plate 15 is displaced with respect to the lower flat plate 13, if the displacement of the upper flat plate 15 with respect to the lower flat plate 13 is, for example, 200 mm, the displacement between the upper flat plate 15 and the flat support 19 is made. The amount is 100 mm, flat support 1
The displacement between the lower plate 9 and the lower plate 13 is 100 mm. Therefore, the upper plate 15 can reduce the vibration with a displacement twice as large as the vibration displacement of the lower plate 13, and is small in size. Large vibration displacement can be reduced.

【0031】下方の平板13の振動が止まると、上方の
平板15はダンパ23の抵抗力を凹球面16に受けなが
ら、図1に示す元の位置に戻ってくる。
When the vibration of the lower flat plate 13 stops, the upper flat plate 15 returns to the original position shown in FIG. 1 while receiving the resistance force of the damper 23 on the concave spherical surface 16.

【0032】この一連の運動は、減衰力を受けた振り子
運動と同じであって、免震のための振り子運動はできる
だけ長周期になることが望ましいので、対向する平板1
3,15の凹球面14,16並びに偏平支持体19の凸
球面17,18の曲率半径は、できるだけ大きいことが
望ましいが、これらの曲率半径を大きくすると、復元力
が小さくなるので、平板15及び平板15の上に取り付
けられている免震対象物の重量やダンパ23から受ける
抵抗力を勘案して凹球面14,16並びに凸球面17,
18の曲率半径を選定する必要がある。
This series of motions is the same as the pendulum motion subjected to damping force, and it is desirable that the pendulum motion for seismic isolation be as long as possible.
It is desirable that the radii of curvature of the concave spheres 14 and 16 of the flat support members 3 and 15 and the convex spheres 17 and 18 of the flat support member 19 be as large as possible. Taking into account the weight of the seismic isolation target mounted on the flat plate 15 and the resistance received from the damper 23, the concave spheres 14, 16 and the convex sphere 17,
It is necessary to select 18 radii of curvature.

【0033】[0033]

【発明の効果】本発明は、高さが小さくて済む偏平支持
体の凸球面と2枚の平板の凹球面とを滑らかに移動させ
るようにしたので、横方向のあらゆる振動を緩和するこ
とができ、免震装置の高さ寸法も小さくて済み、小型で
大きな振動変位を緩和することができ、偏平支持体と2
枚の平板とは極めて滑らかに変位し、大きな振動変位を
極めてスムーズに緩和することができ、一方の平板が所
定以上の加速度で振動するまでは、他方の平板に対し免
震機能を抑止して、所定以上の振動のみを緩和すること
ができ、免震機能を抑止する加速度の下限を最適に調整
できる効果がある。
According to the present invention, since the convex spherical surface of the flat support and the concave spherical surfaces of the two flat plates, which require only a small height, are smoothly moved, any vibration in the horizontal direction can be reduced. The seismic isolation device can be made small in height, small in size and capable of mitigating large vibration displacement.
The two flat plates are displaced extremely smoothly, large vibration displacement can be relieved extremely smoothly, and the seismic isolation function of the other flat plate is suppressed until one of the flat plates vibrates at a predetermined acceleration or more. Therefore, it is possible to mitigate only vibrations equal to or greater than a predetermined value, and to effectively adjust the lower limit of acceleration for suppressing the seismic isolation function.

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

【図1】本発明の実施の形態の一例の縦断面である。FIG. 1 is a longitudinal section of an example of an embodiment of the present invention.

【図2】本発明の他の実施の形態の部分的な拡大縦断面
である。
FIG. 2 is a partially enlarged longitudinal sectional view of another embodiment of the present invention.

【図3】本発明に使用するダンパの実施の形態の一例の
拡大縦断面である。
FIG. 3 is an enlarged longitudinal section of an example of an embodiment of a damper used in the present invention.

【図4】本発明の作動状態を示す縦断面である。FIG. 4 is a longitudinal section showing an operation state of the present invention.

【図5】従来の免震装置の一例の縦断面である。FIG. 5 is a longitudinal section of an example of a conventional seismic isolation device.

【図6】従来の免震装置の他の例の分解斜視図である。FIG. 6 is an exploded perspective view of another example of the conventional seismic isolation device.

【符号の説明】[Explanation of symbols]

13,15 平板 14,16 凹球面 17,18 凸球面 19 偏平支持体 21 転動体 23 ダンパ 13, 15 Flat plate 14, 16 Concave spherical surface 17, 18 Convex spherical surface 19 Flat support 21 Rolling element 23 Damper

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 両面にそれぞれ同じ半径の凸球面が形成
された偏平支持体と、前記凸球面に対し滑らかに移動し
得る凹球面が互いに対向する面に形成され該凹球面で前
記偏平支持体の凸球面を挟持する2枚の平板とを備えた
免震装置において、該凸球面が転動体で覆われ、かつ一
方の対向面に取付けられた他方の平板の対向面に当接し
得る圧接力を調整し得るダンパを備えたことを特徴とす
る免震装置。
1. A flat support having convex spheres of the same radius formed on both surfaces, and a concave sphere which can move smoothly with respect to the convex sphere are formed on surfaces facing each other, and the flat sphere is formed by the concave sphere. A pressure isolating device comprising two flat plates sandwiching a convex spherical surface, wherein the convex spherical surface is covered with a rolling element, and is capable of abutting against the opposing surface of the other flat plate attached to one of the opposing surfaces. A seismic isolation device comprising a damper capable of adjusting the force.
JP10176028A 1998-06-23 1998-06-23 Base isolation device Withdrawn JP2000008642A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10176028A JP2000008642A (en) 1998-06-23 1998-06-23 Base isolation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10176028A JP2000008642A (en) 1998-06-23 1998-06-23 Base isolation device

Publications (1)

Publication Number Publication Date
JP2000008642A true JP2000008642A (en) 2000-01-11

Family

ID=16006474

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10176028A Withdrawn JP2000008642A (en) 1998-06-23 1998-06-23 Base isolation device

Country Status (1)

Country Link
JP (1) JP2000008642A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7200098B2 (en) 1999-11-30 2007-04-03 Samsung Electronics Co., Ltd. Objective lens for high-density optical focusing and an optical disk in an optical pickup

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7200098B2 (en) 1999-11-30 2007-04-03 Samsung Electronics Co., Ltd. Objective lens for high-density optical focusing and an optical disk in an optical pickup

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