JPS61148667A - Attaching structure of magnetic disc - Google Patents
Attaching structure of magnetic discInfo
- Publication number
- JPS61148667A JPS61148667A JP27001584A JP27001584A JPS61148667A JP S61148667 A JPS61148667 A JP S61148667A JP 27001584 A JP27001584 A JP 27001584A JP 27001584 A JP27001584 A JP 27001584A JP S61148667 A JPS61148667 A JP S61148667A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic disk
- glass
- magnetic disc
- magnetic
- thermal expansion
- 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.)
- Granted
Links
- 239000011521 glass Substances 0.000 claims abstract description 28
- 125000006850 spacer group Chemical group 0.000 claims abstract description 19
- 239000000919 ceramic Substances 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 4
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 4
- 239000007769 metal material Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/0014—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form
- G11B23/0021—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form discs
- G11B23/0028—Details
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
- G11B17/02—Details
- G11B17/038—Centering or locking of a plurality of discs in a single cartridge
Landscapes
- Holding Or Fastening Of Disk On Rotational Shaft (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は磁気ディスク装置における磁気ディスクの取付
構造に係り、特にガラス基板によって構成された磁気デ
ィスクを、磁気ディスク装置のハブ構成部に取付ける構
造に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mounting structure for a magnetic disk in a magnetic disk device, and particularly to a structure for mounting a magnetic disk constituted by a glass substrate to a hub component of a magnetic disk device. It is related to.
一般に磁気ディスク装置に用いられている磁気記録用の
ハードディスクは、数鶴程度の厚さのアルミニウム、又
はアルミニウム合金等からなるディスク基板を主体とし
、該ディスク基板の片面、又は両面にγ−Ｆｅ２０３等
からなる磁性膜が被着された構成である。そして上記磁
気記録用ディスク（以下、磁気ディスクと称する）を複
数枚、磁気ディスク装置の回転駆動機構に連結されたハ
ブ構成部にそれぞれスペーサを介して等間隔をもって機
械的に取付けている。Generally, hard disks for magnetic recording used in magnetic disk devices mainly have a disk substrate made of aluminum or aluminum alloy with a thickness of about a few cranes, and one or both sides of the disk substrate are coated with γ-Fe203, etc. It has a structure in which a magnetic film consisting of is adhered. A plurality of the above-mentioned magnetic recording disks (hereinafter referred to as magnetic disks) are mechanically attached to a hub component connected to a rotational drive mechanism of a magnetic disk device at equal intervals via spacers.
しかしながら近来、磁気ディスクの高記録密度化に伴っ
て、磁気ヘッドと磁気ディスク間の浮上間隔の極小化、
磁気記録媒体層の薄膜化、ディスク基板のより高度な平
面化及び表面の平滑化が要求されており、上記のような
アルミニウム等からなるディス゛り基板を主体とした磁
気ディスクにあっては、記録特性及び耐クラツシユ性の
点で自ずと限界がある。However, in recent years, with the increase in the recording density of magnetic disks, the flying distance between the magnetic head and the magnetic disk has been minimized.
There are demands for thinner magnetic recording media layers, higher flatness and smoother surfaces for disk substrates, and magnetic disks based on disk substrates made of aluminum, etc., as described above, are required to There are naturally limits in terms of characteristics and crush resistance.
そこで上記記録特性及び耐クラツシユ性を満足させるた
めに、表面強度及び平滑面化が極めて効果的に得られる
ガラス基板を用いた磁気ディスクが提案されている。と
ころがガラス基板を用いた磁気ディスクは破壊強度がア
ルミニウム基板等に比べて劣り、磁気ディスク装置のハ
ブ構成部に対し、金属製の磁気ディスクと同様の取付構
造によって取付けるには信頼性に欠ける問題があり、こ
れら取付は構造の改善が要望されている。Therefore, in order to satisfy the above-mentioned recording characteristics and crush resistance, a magnetic disk using a glass substrate that can extremely effectively obtain surface strength and smoothness has been proposed. However, magnetic disks using glass substrates have inferior breaking strength compared to aluminum substrates, etc., and there is a problem of lack of reliability when attaching them to the hub component of a magnetic disk device using the same mounting structure as a metal magnetic disk. There is a need to improve the structure of these installations.
第３図は従来の磁気ディスクの取付は構造を説明するた
めの要部断面図であり、同図において、１は回転駆動機
構に連結されたスピンドル、２は軸受け、３はハブ本体
、４はリング状金属スペーサ、５は複数枚のガラス製磁
気ディスク、６は固定円板をそれぞれ示す。上記複数枚
のガラス製磁気ディスク５は、スピンドル１と連結され
たハブ本体３にそれぞれリング状金属スペーサ４を介し
て嵌挿され、更にその上に固定円板６を介してネジ７に
よって固定することにより、所定間隔をもって機械的に
取付ける構造が採られていた。FIG. 3 is a cross-sectional view of the main parts for explaining the structure of a conventional magnetic disk installation. In the figure, 1 is a spindle connected to a rotational drive mechanism, 2 is a bearing, 3 is a hub body, and 4 is a A ring-shaped metal spacer, 5 a plurality of glass magnetic disks, and 6 a fixed disk are shown. The plurality of glass magnetic disks 5 are respectively fitted into the hub body 3 connected to the spindle 1 via ring-shaped metal spacers 4, and further fixed thereon with screws 7 via a fixing disk 6. As a result, a structure has been adopted in which they are mechanically attached at predetermined intervals.
しかし、このような磁気ディスクの取付は構造において
は、取付けられる前記複数枚の磁気ディスク５がアルミ
ニウム、又はアルミニウム合金等からなるディスク基板
を用いた場合は、同等問題ないが、これがガラス基板を
用いた磁気ディスクの場合では、ハブ本体３に取付けら
れたガラス製磁気ディスクと、それぞれアルミニウム合
金等からなる金属製のハブ本体３、リング状スペーサ４
及び固定円板６等との熱膨張係数の差（例えばガラス基
板の熱膨張係数α＝ ８０ ｘ １０−７／ ｔ、金属
製ハブ本体３及びリング状スペーサ４等の熱膨張係数α
＝ ２３０Ｘ１０−７／”Ｃ）が大きいため、該磁気デ
ィスクの回転駆動時の温度変化によって磁気ディスクの
位置ズレや、場合によっては過大応力が付加されて破損
する恐れがある等の欠点があった。However, in terms of the structure, such mounting of magnetic disks does not have the same problem if the plurality of magnetic disks 5 to be mounted use disk substrates made of aluminum or aluminum alloy, etc., but if this is done by using a glass substrate. In the case of a magnetic disk, there is a glass magnetic disk attached to a hub body 3, a metal hub body 3 made of aluminum alloy, etc., and a ring-shaped spacer 4.
and the difference in thermal expansion coefficient with the fixed disk 6, etc. (for example, the thermal expansion coefficient α of the glass substrate = 80 x 10-7/t, the thermal expansion coefficient α of the metal hub body 3, the ring-shaped spacer 4, etc.)
= 230X10-7/"C), there were drawbacks such as the risk of the magnetic disk being misaligned due to temperature changes during rotational driving of the magnetic disk, and in some cases, excessive stress could be applied and damage the magnetic disk. .
上記問題点は、スピンドルと連結されたハブ本体にリン
グ状スペーサを介してガラス製磁気ディスクを取付ける
構造において、上記ハブ本体及びリング状スペーサを、
前記磁気ディスクの主体となるガラス基板と略同等の熱
膨張係数を有する金属部材、又はセラミックス部材によ
り構成した本発明による磁気ディスクの取付構造によっ
て解決される。The above problem arises in a structure in which a glass magnetic disk is attached to a hub body connected to a spindle via a ring-shaped spacer.
This problem is solved by the magnetic disk mounting structure according to the present invention, which is made of a metal member or a ceramic member having a coefficient of thermal expansion substantially equal to that of the glass substrate, which is the main body of the magnetic disk.
即ち、ガラス製磁気ディスクを実装するハブ本体及びリ
ング状スペーサ等の取付部材の材質を、磁気ディスクの
主体となるガラス基板と略同等の熱膨張係数を有する金
属部材、又はセラミックス部材により構成し、かかるハ
ブ本体に上記リング状スペーサを介して１枚、又は複数
枚のガラス製磁気ディスクを取付ける構造とすることに
より、熱膨張差による磁気ディスクの位置ズレや、応力
歪等に起因する破損を防止することが可能となる。That is, the material of the hub body on which the glass magnetic disk is mounted and the mounting members such as the ring-shaped spacer are made of a metal member or a ceramic member that has approximately the same coefficient of thermal expansion as the glass substrate that is the main body of the magnetic disk, By attaching one or more glass magnetic disks to the hub body via the ring-shaped spacer, it is possible to prevent the magnetic disks from being misaligned due to differences in thermal expansion and from being damaged due to stress distortion, etc. It becomes possible to do so.
以下図面を用いて本発明の実施例について詳細に説明す
る。Embodiments of the present invention will be described in detail below with reference to the drawings.
第１図は本発明に係る磁気ディスクの取付構造の一実施
例を示す要部縦断面図である。なお第３図と同等部分に
は同一符号を付した。FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of a magnetic disk mounting structure according to the present invention. Note that parts equivalent to those in FIG. 3 are given the same reference numerals.
図において、ハブ本体２３、リング状スペーサ２４及び
固定円板２６を、ガラス製磁気ディスク５の主体をなす
ガラス基板と略同等の熱膨張係数を有する例えばアルミ
ナセラミックス部材（熱膨張係数α″＝８０Ｘ１０−’
／”Ｃ）によって形成し、これらセラミックス製ハブ本
体２３に対して、同じくセラミックス製のリング状スペ
ーサ２４を介して１枚、又は複数枚のガラス製磁気ディ
スク５を配設し、同じくセラミックス製の固定円板２６
をネジ７によって締付けた取付構造とする。In the figure, the hub body 23, the ring-shaped spacer 24, and the fixed disk 26 are made of, for example, an alumina ceramic material (thermal expansion coefficient α″=80×10 −'
/''C), one or more glass magnetic disks 5 are disposed on these ceramic hub bodies 23 via ring-shaped spacers 24 also made of ceramics, and Fixed disk 26
The mounting structure is such that it is tightened with screws 7.
かくすれば、熱膨張差による磁気ディスク５の位置ズレ
や、応力歪等の部分集中に起因する破損等の発生を無く
することが可能となる。In this way, it is possible to eliminate misalignment of the magnetic disk 5 due to differences in thermal expansion and damage caused by local concentration of stress and strain.
なお上記締付はネジ７と各セラミックス部材との熱膨張
差については、バネ座金２７の介在によって吸収是正−
され、磁気ディスク５に対する不都合が生じることはな
い。In addition, the above tightening is performed by using the spring washer 27 to absorb and correct the difference in thermal expansion between the screw 7 and each ceramic member.
Therefore, no inconvenience occurs to the magnetic disk 5.
第２図は本発明に係る磁気ディスクの取付構造の他の実
施例を示す要部縦断面図であり、本実施例が第１図によ
る実施例と異なる点は、ハブ本体３３がガラス製磁気デ
ィスク５の主体をなすガラス基板と略同等の熱膨張係数
を有する例えばアルミナセラミックス部材（熱膨張係数
α＃ ８０ Ｘ １０−７／℃）によって円板状に形成
されており、該円板状ハブ本体３３に対して、同じくセ
ラミックス製のリング状スペーサ２４を介して複数枚の
ガラス製磁気ディスク５と、同じくセラミックス製の下
部固定リング板３４とを、図示のように組み合わせて締
付はボルト３５により固定する取付構造としたことであ
る。FIG. 2 is a vertical cross-sectional view of a main part showing another embodiment of the magnetic disk mounting structure according to the present invention. This embodiment differs from the embodiment shown in FIG. 1 because the hub body 33 is made of glass magnetic material. The disc-shaped hub is formed of, for example, an alumina ceramic member (thermal expansion coefficient α# 80 x 10-7/°C) having approximately the same coefficient of thermal expansion as the glass substrate forming the main body of the disc 5. A plurality of glass magnetic disks 5 and a lower fixed ring plate 34 also made of ceramics are combined with the main body 33 via ring-shaped spacers 24 also made of ceramics as shown in the figure, and then tightened with bolts 35. The mounting structure is such that it can be fixed in place.
この実施例構成によっても前記第１図による実施例と同
様の効果が得られる。The configuration of this embodiment also provides the same effects as the embodiment shown in FIG. 1 above.
尚、以上の各実施例では、ハブ本体、リング状スペーサ
及び固定円板等をガラス製磁気ディスク５の主体をなす
ガラス基板と略同等の熱膨張係数を有するアルミナセラ
ミックス（熱膨張係数αζ８０Ｘ１０−７／’Ｃ）製と
した場合の例について説明したが、本発明はこの例に限
定されるものではなく、例えばガラス基板と略同等の熱
膨張係数を有するステンレス鋼（熱膨張係数α″＝９９
Ｘ１０−７／”Ｃ）製とした場合にも同様の効果が得ら
れる。In each of the above embodiments, the hub body, ring-shaped spacer, fixed disk, etc. are made of alumina ceramics (thermal expansion coefficient αζ80×10-7 /'C) has been described, but the present invention is not limited to this example. For example, stainless steel (thermal expansion coefficient α''=99
A similar effect can be obtained when it is made of X10-7/''C).
又、上記したようにハブ本体、リング状スペーサ及び固
定円板等の材質を替えることにより構造が特に複雑とな
ることは無く、又コスト高となることもない。Further, as described above, by changing the materials of the hub body, ring-shaped spacer, fixed disk, etc., the structure does not become particularly complicated, and the cost does not increase.
更に、以上の各実施例構成においては、ハブ本体の中心
部より、各ガラス製磁気ディスク間の間隙に空気流を噴
出させる噴出口及び塵埃除去用フィルター等の図示はな
いが、これらを配設できることは言うまでもない。Furthermore, in the configurations of each of the above embodiments, although not shown in the drawings, there are jet ports that eject airflow from the center of the hub body into the gaps between the glass magnetic disks, dust removal filters, etc., but these are provided. It goes without saying that it can be done.
以上の説明から明らかなように、本発明に係る磁気ディ
スクの取付構造によれば、取付構造を複雑化することな
く、複数枚のガラス製磁気ディスクの位置ズレや破損を
防止することが可能となり、磁気ディスク装置の信頼性
が著しく向上する等実用上製れた効果を奏する。As is clear from the above description, according to the magnetic disk mounting structure according to the present invention, it is possible to prevent misalignment and damage of a plurality of glass magnetic disks without complicating the mounting structure. , the reliability of magnetic disk devices is significantly improved, and other practical effects are achieved.
従って、ガラス製磁気ディスクは勿論のこと、セラミッ
クス製磁気ディスクを適用した磁気ディスク装置に適用
して極めて有利である。Therefore, it is extremely advantageous to apply it not only to glass magnetic disks but also to magnetic disk drives using ceramic magnetic disks.
第１図は本発明に係る磁気ディスクの取付構造の一実施
例を示す要部縦断面図、
第２図は本発明に係る磁気ディスクの取付構造の他の実
施例を示す要部縦断面図、
第３図は従来の磁気ディスクの取付構造を説明するため
の要部縦断面図を示す。
図中、５はガラス製磁気ディスク、７は締付はネジ、２
３はセラミックス製ハブ本体、２４はセラミックス製リ
ング状スペーサ、２６はセラミックス製固定円板、２７
はハネ座金、３３はセラミックス製円板状ハブ本体、３
４はセラミックス製下部固定リング板、３５は締付はボ
ルトをそれぞれ示す。
１１／ＷＩ
第 ３１１！ＩFIG. 1 is a longitudinal cross-sectional view of a main part showing one embodiment of a magnetic disk mounting structure according to the present invention, and FIG. 2 is a longitudinal cross-sectional view of a main part showing another embodiment of a magnetic disk mounting structure according to the present invention. , FIG. 3 shows a longitudinal cross-sectional view of a main part for explaining a conventional magnetic disk mounting structure. In the figure, 5 is a glass magnetic disk, 7 is a screw for tightening, 2
3 is a hub body made of ceramics, 24 is a ring-shaped spacer made of ceramics, 26 is a fixed disk made of ceramics, 27
3 is a spring washer, 33 is a ceramic disk-shaped hub body, 3
Reference numeral 4 indicates a lower fixing ring plate made of ceramics, and reference numeral 35 indicates a bolt for tightening. 11/WI No. 311! I
Claims (1)
介してガラス製磁気ディスクを取付ける構造において、
上記ハブ本体及びリング状スペーサを、前記磁気ディス
クの主体であるガラス基板と略同等の熱膨張係数を有す
る金属部材、又はセラミックス部材により構成したこと
を特徴とする磁気ディスクの取付構造。In a structure in which a glass magnetic disk is attached to a hub body connected to a spindle via a ring-shaped spacer,
A mounting structure for a magnetic disk, characterized in that the hub body and the ring-shaped spacer are made of a metal member or a ceramic member having a coefficient of thermal expansion substantially equal to that of the glass substrate that is the main body of the magnetic disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27001584A JPS61148667A (en) | 1984-12-20 | 1984-12-20 | Attaching structure of magnetic disc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27001584A JPS61148667A (en) | 1984-12-20 | 1984-12-20 | Attaching structure of magnetic disc |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61148667A true JPS61148667A (en) | 1986-07-07 |
| JPH0580745B2 JPH0580745B2 (en) | 1993-11-10 |
Family
ID=17480356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27001584A Granted JPS61148667A (en) | 1984-12-20 | 1984-12-20 | Attaching structure of magnetic disc |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61148667A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62121972A (en) * | 1985-11-22 | 1987-06-03 | Hoya Corp | Magnetic disk device |
| JPS62129986A (en) * | 1985-11-30 | 1987-06-12 | Hoya Corp | Magnetic disk device |
| JPS62175980A (en) * | 1986-01-29 | 1987-08-01 | Hoya Corp | Magnetic disk device |
| JPS62124665U (en) * | 1986-01-29 | 1987-08-07 | ||
| US4910620A (en) * | 1987-05-14 | 1990-03-20 | Siemens Aktiengesellschaft | Thermal compensation structure for a disk pack module |
| JPH02276450A (en) * | 1989-04-17 | 1990-11-13 | Nippon Densan Corp | Spindle motor |
| JPH038187A (en) * | 1989-06-02 | 1991-01-16 | Fujitsu Ltd | Disk device |
| US5760999A (en) * | 1996-04-30 | 1998-06-02 | Kabushiki Kaisha Soode Nagano | Hard disc spacer and hard disc clamp |
| US5917677A (en) * | 1995-12-18 | 1999-06-29 | Seagate Technology, Inc. | Disk drive motor spindle hub assembly with separately formed hub ceramic flange attachment |
| US5969902A (en) * | 1995-03-15 | 1999-10-19 | Kyocera Corporation | Support magnetic disk substrate and magnetic disk unit using the support member composed of Forsterite and an iron based component |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59149275U (en) * | 1983-03-23 | 1984-10-05 | 松下電器産業株式会社 | floppy disc |
| JPS59180828A (en) * | 1983-03-31 | 1984-10-15 | Fujitsu Ltd | Magnetic disk and its manufacture |
-
1984
- 1984-12-20 JP JP27001584A patent/JPS61148667A/en active Granted
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59149275U (en) * | 1983-03-23 | 1984-10-05 | 松下電器産業株式会社 | floppy disc |
| JPS59180828A (en) * | 1983-03-31 | 1984-10-15 | Fujitsu Ltd | Magnetic disk and its manufacture |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62121972A (en) * | 1985-11-22 | 1987-06-03 | Hoya Corp | Magnetic disk device |
| JPS62129986A (en) * | 1985-11-30 | 1987-06-12 | Hoya Corp | Magnetic disk device |
| JPS62175980A (en) * | 1986-01-29 | 1987-08-01 | Hoya Corp | Magnetic disk device |
| JPS62124665U (en) * | 1986-01-29 | 1987-08-07 | ||
| JPH0548554B2 (en) * | 1986-01-29 | 1993-07-21 | Hoya Corp | |
| US4910620A (en) * | 1987-05-14 | 1990-03-20 | Siemens Aktiengesellschaft | Thermal compensation structure for a disk pack module |
| JPH02276450A (en) * | 1989-04-17 | 1990-11-13 | Nippon Densan Corp | Spindle motor |
| JPH038187A (en) * | 1989-06-02 | 1991-01-16 | Fujitsu Ltd | Disk device |
| US5969902A (en) * | 1995-03-15 | 1999-10-19 | Kyocera Corporation | Support magnetic disk substrate and magnetic disk unit using the support member composed of Forsterite and an iron based component |
| US6215617B1 (en) | 1995-03-15 | 2001-04-10 | Kyocera Corporation | Support member for magnetic disk substrate |
| US5917677A (en) * | 1995-12-18 | 1999-06-29 | Seagate Technology, Inc. | Disk drive motor spindle hub assembly with separately formed hub ceramic flange attachment |
| US5760999A (en) * | 1996-04-30 | 1998-06-02 | Kabushiki Kaisha Soode Nagano | Hard disc spacer and hard disc clamp |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0580745B2 (en) | 1993-11-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |