JPS60106027A - Disc cartridge - Google Patents
Disc cartridgeInfo
- Publication number
- JPS60106027A JPS60106027A JP21256283A JP21256283A JPS60106027A JP S60106027 A JPS60106027 A JP S60106027A JP 21256283 A JP21256283 A JP 21256283A JP 21256283 A JP21256283 A JP 21256283A JP S60106027 A JPS60106027 A JP S60106027A
- Authority
- JP
- Japan
- Prior art keywords
- hub
- driving
- receiving surface
- driving device
- friction
- 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.)
- Pending
Links
- 238000003780 insertion Methods 0.000 claims abstract description 8
- 230000037431 insertion Effects 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- 229920003023 plastic Polymers 0.000 claims abstract description 5
- 239000004033 plastic Substances 0.000 claims abstract description 5
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 229920001230 polyarylate Polymers 0.000 abstract description 5
- 239000011347 resin Substances 0.000 abstract description 5
- 229920005989 resin Polymers 0.000 abstract description 5
- 239000000314 lubricant Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 235000014113 dietary fatty acids Nutrition 0.000 description 4
- 229930195729 fatty acid Natural products 0.000 description 4
- 239000000194 fatty acid Substances 0.000 description 4
- -1 fatty acid esters Chemical class 0.000 description 4
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 150000004665 fatty acids Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- GOQYKNQRPGWPLP-UHFFFAOYSA-N n-heptadecyl alcohol Natural products CCCCCCCCCCCCCCCCCO GOQYKNQRPGWPLP-UHFFFAOYSA-N 0.000 description 2
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 2
- PRAKJMSDJKAYCZ-UHFFFAOYSA-N squalane Chemical compound CC(C)CCCC(C)CCCC(C)CCCCC(C)CCCC(C)CCCC(C)C PRAKJMSDJKAYCZ-UHFFFAOYSA-N 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004909 Moisturizer Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 208000028659 discharge Diseases 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- UHCBBWUQDAVSMS-UHFFFAOYSA-N fluoroethane Chemical compound CCF UHCBBWUQDAVSMS-UHFFFAOYSA-N 0.000 description 1
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical compound FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229940057995 liquid paraffin Drugs 0.000 description 1
- HGPXWXLYXNVULB-UHFFFAOYSA-M lithium stearate Chemical compound [Li+].CCCCCCCCCCCCCCCCCC([O-])=O HGPXWXLYXNVULB-UHFFFAOYSA-M 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 230000001333 moisturizer Effects 0.000 description 1
- JXTPJDDICSTXJX-UHFFFAOYSA-N n-Triacontane Natural products CCCCCCCCCCCCCCCCCCCCCCCCCCCCCC JXTPJDDICSTXJX-UHFFFAOYSA-N 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229940032094 squalane Drugs 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000008117 stearic acid Substances 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
- G11B23/0035—Details means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving
Landscapes
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、磁気ディスクを収納したディスクカートリッ
ジに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disk cartridge containing a magnetic disk.
従来のディスクカートリッジにおいて、磁気ディスクを
保持するプラスチック製ハブは、一般的にはボリアリレ
ート樹脂を使用しており、駆動装置の受け面と前記ハブ
との摩擦係数は０３と比較的大きな値で・あった。In conventional disk cartridges, the plastic hub that holds the magnetic disk is generally made of polyarylate resin, and the coefficient of friction between the hub and the receiving surface of the drive device is a relatively large value of 03. there were.
従って、磁気ディスクのトルクが小さい場合には、前記
受は面とハブ間で滑りが生じず、駆動ビンがハブに形成
した係合部と安宇して係合しない場合が生じていた。さ
らに進むと受け面の移動によりハブに傷が生じ、受は面
とハブとの摩擦係数をより高めろ原因となっていた。Therefore, when the torque of the magnetic disk is small, the bridge does not slip between the surface and the hub, and the drive pin sometimes does not engage with the engagement portion formed on the hub. As the bearing progressed further, the movement of the receiving surface caused scratches on the hub, which caused the receiving to increase the coefficient of friction between the surface and the hub.
本発明の目的は、上述の従来例の問題点を解消し、ハブ
にプラスチック材を使用しても、ハブと駆動装置の受け
面間の摩擦を少なくし、磁気ディスクの駆動を確実にで
きるディスクカートリッジを提供することにある。An object of the present invention is to solve the above-mentioned problems of the prior art, reduce friction between the hub and the receiving surface of the drive device, and ensure reliable drive of the magnetic disk even if plastic material is used for the hub. The purpose is to provide cartridges.
この目的を達成するために、本発明は、ハブをプラスチ
ック材で形成し、このハブの少なくとも駆動装置の受け
面忙接触する部分に低摩擦被膜を形成したことを特徴と
する。In order to achieve this object, the present invention is characterized in that the hub is made of a plastic material, and a low friction coating is formed on at least the portion of the hub that comes into contact with the receiving surface of the drive device.
以下、本発明の好適な実強例を説明する。Hereinafter, preferred practical examples of the present invention will be explained.
第１図はディスクカートリッジ１の全体斜視図でであり
、ディスクカートリッジｌは、上ナース１αと下ケース
１ｂとから形成されており、表面には内部に収納した磁
気ディスク２を保持するノ・プ３を外部に露呈するため
の透孔４と、磁気ヘッド挿入口５とな設けである。前記
ハブ３には、図示しない駆動装置の駆動軸を嵌着するた
めの駆動軸挿入口６と、駆動装置の受け面７に突設した
駆動ビン７αと係合する係合部となる駆動ビン挿入口８
とを形成しである。さらにハブ３は第２図に示す断面図
のようにボリアリレート樹脂より成型され、側部で磁気
ディスク２を保持している。FIG. 1 is an overall perspective view of the disk cartridge 1. The disk cartridge L is formed from an upper case 1α and a lower case 1b, and has a nozzle on its surface that holds the magnetic disk 2 housed inside. A through hole 4 for exposing the magnetic head 3 to the outside and a magnetic head insertion opening 5 are provided. The hub 3 has a drive shaft insertion opening 6 for fitting a drive shaft of a drive device (not shown), and a drive pin serving as an engaging portion that engages with a drive pin 7α protruding from the receiving surface 7 of the drive device. Insertion port 8
and is formed. Furthermore, the hub 3 is molded from a polyarylate resin, as shown in the cross-sectional view of FIG. 2, and holds the magnetic disk 2 on its side.
前記駆動装置の受け面７は、第１図の矢印Ａ方向へ降下
し、ハブ３表面と接触しながら駆動ビン７ａを駆動ビン
挿入口８と嵌合すべく矢印Ｂ方向へ移動するので、少な
くとも受け面７が接触するハブ３に低摩擦被膜９を形成
する。第２図にはハブ３の上下表面すべてに前記被膜９
を形成した状態を示しである。The receiving surface 7 of the drive device descends in the direction of arrow A in FIG. A low friction coating 9 is formed on the hub 3 with which the receiving surface 7 contacts. In FIG. 2, the coating 9 is applied to all the upper and lower surfaces of the hub 3.
This figure shows the state in which a
以下に、前記低摩擦被膜９の形成方法の具体例を説明す
る。A specific example of the method for forming the low friction coating 9 will be described below.
実施例１；
ハブ３の素材をボリアリレート樹脂（商品名Ｕポリマー
、ＵＦ−１０（Ｎとし、このハブ３を四フッ化炭素ガス
中で放電処理し、〕・ブｙ表面をプｏｒｒ 、放電時間
１０分で行う。Example 1: The material of the hub 3 was made of polyarylate resin (trade name: U polymer, UF-10 (N), and the hub 3 was subjected to discharge treatment in carbon tetrafluoride gas. Do it in 10 minutes.
実施例２；
上記実施例１の四フッ化炭素ガスにかえてフッ化ビニル
ガスを使用する。Example 2; Vinyl fluoride gas is used instead of carbon tetrafluoride gas in Example 1 above.
実施例３；
上記実施例１の四フッ化炭素ガスにかえて、フッ化エチ
ルガスを使用する。Example 3: Ethyl fluoride gas is used in place of the carbon tetrafluoride gas used in Example 1 above.
上述した各実施例の効果と比較するために、上巳の比較
例のものを採用した。In order to compare the effects of each of the above-mentioned examples, Uami's comparative example was adopted.
比較例；
商品名Ｕポリマー、ＵＦ１００製のハブに同等表面処理
を施さない。Comparative example: A hub made from U Polymer (trade name), UF100, was not subjected to equivalent surface treatment.
前記実施例および比較例のハブに磁気ディスクを装着し
、ディスクカートリッジに組込んだ後、駆動装置に２万
回装着脱を繰返して、ハブ表「１１の駆動装置の受け面
による摩耗艮をｆｆ１ｌ＋宇した結果を表１に示す。こ
の表１にて分るように、実肯例Ｊ乃至３のようにプラズ
マ重合処理を施したものは、受は面との摩擦係数は小さ
く、駆動ビンが所定の駆動ビン挿入口へ安定して位置し
、また受け面によるハブ摩耗鳳も低減できるものである
。After attaching a magnetic disk to the hub of the above example and comparative example and assembling it into a disk cartridge, it was repeatedly attached to and detached from the drive unit 20,000 times. The results are shown in Table 1.As can be seen from Table 1, the friction coefficient of the bridge with the surface is small and the driving bottle is It can be stably positioned in a predetermined drive bottle insertion opening, and hub wear and tear caused by the receiving surface can be reduced.
表 １
また上述のようなプラズマ重合処理の外に下記のような
液体潤滑剤をノ・プ表面に塗布することも考えられる。Table 1 In addition to the above-described plasma polymerization treatment, it is also conceivable to apply a liquid lubricant as described below to the nop surface.
実施例Ａ；
ハブ３の素材をボリアリレート樹脂（商品名Ｕポリマー
、ＵＦ−１００）とし、このハブ３の表面にシリコンオ
イル（ＫＦ−９６）の７レオン溶液をスプレーコートす
る。Example A: The material of the hub 3 is polyarylate resin (trade name: U Polymer, UF-100), and the surface of the hub 3 is spray coated with a 7 Leon solution of silicone oil (KF-96).
実施例Ｂ； 実施例Ａと同一素材のハブにスクワランを塗布する。Example B; Apply squalane to a hub made of the same material as in Example A.
実施例Ｃ；
実施例Ａと同一素材の７・プにパー７０ロポリアルキル
エーテルを塗布する。Example C; 7-P made of the same material as in Example A is coated with Par70 polyalkyl ether.
上記各実施例の効果と比較するため、下記の比較例のも
のを採用した。In order to compare the effects of each of the above examples, the following comparative examples were adopted.
比較例；
商品名Ｕポリマー、ＵＦ−１００製のノ飄ブに同等表面
処理を施さない。Comparative Example: A knob made of UF-100 (trade name: U Polymer) was not subjected to the same surface treatment.
そして上記各実施例と比較例との対ステンレススチール
Ｖ！擦係数を測定した結果は表２に示すようになった。And the stainless steel V! of each of the above examples and comparative examples! The results of measuring the friction coefficient are shown in Table 2.
この表２のように実施例Ａ乃至０において、摩擦係数が
小さくなることが分る。As shown in Table 2, it can be seen that in Examples A to 0, the coefficient of friction is small.
尚、液体１ｆＦ！剤としては、上述の実施例の外にステ
アリン酸−Ｂｕ等の脂肪酸エステル、流動パラフィン等
の炭化水素、オレイン酸等の脂肪酸およびフッ紫オイル
等があげられる。In addition, liquid 1fF! In addition to the above-mentioned examples, examples of the agent include fatty acid esters such as stearic acid-Bu, hydrocarbons such as liquid paraffin, fatty acids such as oleic acid, and fluorinated oil.
さらにまた、低摩擦被膜９を形成するため方法として、
ハブ３に炭奏数８以上の脂肪酸、脂肪酸石鹸、ステアリ
ルアミド、ステアリルアルコールの少なくとも一種をハ
ブに塗布させても良い。Furthermore, as a method for forming the low friction coating 9,
The hub 3 may be coated with at least one of fatty acids with a carbon number of 8 or more, fatty acid soap, stearylamide, and stearyl alcohol.
これらの潤滑剤の少なくとも一種を、７レオン又はトル
エンに溶解させ、この溶液にハブ３を約３０分間浸漬し
、乾燥後、ハブ表面に析出した潤滑剤をきれいな布で拭
き取る。また、上記ｉｌｌ滑剤のハブへの付着力法とし
ては、直接ｎ滑剤をノ・プにこすり付けても良く、真空
中で潤滑剤を蒸発させてハブに吸着させても良い。At least one of these lubricants is dissolved in 7 Leon or toluene, the hub 3 is immersed in this solution for about 30 minutes, and after drying, the lubricant deposited on the hub surface is wiped off with a clean cloth. Further, as a method of adhesion of the ill lubricant to the hub, the lubricant may be directly rubbed on the knob, or the lubricant may be evaporated in a vacuum and adsorbed to the hub.
以下、具体的実施例の効果を比較してみる。The effects of specific examples will be compared below.
実施例イ； 潤滑剤としてステアリン酸な使用する。Example a; Use stearic acid as a lubricant.
実施例口； 潤滑剤としてステアリン酸リチウムを使用する。Example mouth; Use lithium stearate as a lubricant.
実施例ハ； 潤ｉけ劃としてステアリルアミドな使用する。Example c; Stearylamide is used as a moisturizer.
実施例口； 潤滑剤としてステアリルアルコールを使用する。Example mouth; Use stearyl alcohol as a lubricant.
そして上記各実施例と比較する比較例には、何等の表面
処理を施していない０これら各側の摩擦係数は表３に示
すようになった。Comparative examples to be compared with the above-mentioned examples were not subjected to any surface treatment.The friction coefficients on each side were as shown in Table 3.
表 ３
この表３にて分るように実ぬ例イ乃至二におし１ても、
摩擦係数が小さくなる。Table 3 As can be seen from Table 3, even in the actual examples A to II and I,
Friction coefficient becomes smaller.
以上説明したように１本発明によれは、ノ・プの少なく
とも駆動装置の受け面に接触する部分に形成した低摩擦
被膜によって、ノ１ブと受け面の摩擦係数を小さくし、
駆動装置によるノ１プの駆動をスムーズかつ確実に行え
るディスクカートリッジを提供することができる。As explained above, one aspect of the present invention is to reduce the coefficient of friction between the knob and the receiving surface by a low-friction coating formed on at least the portion of the knob that contacts the receiving surface of the drive device.
It is possible to provide a disk cartridge in which the drive device can smoothly and reliably drive the knob.
節１図はディヌクカートリッジの全体斜視図、ｔ１４２
図は本発明のハブ部分を示す一実肺例の断面図である。
１・・・・・・ディスクカートリッジ、２・・・・・・
磁気ディスク、３・・・・・・ハブ、５・・・・・・磁
気ヘッド挿入［］、７・・・・・・駆動装置の受けｍｌ
、７α・・・・・・駆動ビン、８・・・・・・係合部、
９・・・・・・低摩擦被膜。Section 1 figure is an overall perspective view of the Dinuk cartridge, t142
The figure is a cross-sectional view of an example lung showing the hub portion of the present invention. 1... Disk cartridge, 2...
Magnetic disk, 3...hub, 5...magnetic head insertion [], 7...driver receiver ml
, 7α... Drive bin, 8... Engagement part,
9...Low friction coating.
Claims (1)
転自在に収納し、この磁気ディスクを、駆動ビンとの係
合部な表面圧形成したハブにて保持したディスクカート
リッジにおいて、前記ハブをプラスチック材で形成し、
このハブの少なくとも駆動装置の受け面に接触する部分
に低壓擦被膜を形成したことを特徴とするディスクカー
トリッジ０In a disk cartridge in which a magnetic disk is rotatably housed in a case having a magnetic head insertion slot, and this magnetic disk is held by a hub formed with a surface pressure that is an engagement portion with a drive bin, the hub is made of a plastic material. form,
A disk cartridge 0 characterized in that a low friction coating is formed on at least the portion of the hub that contacts the receiving surface of the drive device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21256283A JPS60106027A (en) | 1983-11-14 | 1983-11-14 | Disc cartridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21256283A JPS60106027A (en) | 1983-11-14 | 1983-11-14 | Disc cartridge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60106027A true JPS60106027A (en) | 1985-06-11 |
Family
ID=16624749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21256283A Pending JPS60106027A (en) | 1983-11-14 | 1983-11-14 | Disc cartridge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60106027A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0514703A2 (en) * | 1991-04-30 | 1992-11-25 | Sony Corporation | A bearing ring with low sliding friction for an optical disk |
| WO1993003482A1 (en) * | 1991-08-02 | 1993-02-18 | Mitsui Petrochemical Industries, Ltd. | Hub for optical recording medium and optical recording medium |
| US5729414A (en) * | 1991-07-23 | 1998-03-17 | Emtec Magnetics Gmbh | Recording disk having a non-magnetizable hub cover |
| US5983089A (en) * | 1994-09-26 | 1999-11-09 | Endgate Corporation | Slotline-mounted flip chip |
| US6265937B1 (en) | 1994-09-26 | 2001-07-24 | Endgate Corporation | Push-pull amplifier with dual coplanar transmission line |
-
1983
- 1983-11-14 JP JP21256283A patent/JPS60106027A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0514703A2 (en) * | 1991-04-30 | 1992-11-25 | Sony Corporation | A bearing ring with low sliding friction for an optical disk |
| EP0514703A3 (en) * | 1991-04-30 | 1994-08-10 | Sony Corp | A bearing ring with low sliding friction for an optical disk |
| US5729414A (en) * | 1991-07-23 | 1998-03-17 | Emtec Magnetics Gmbh | Recording disk having a non-magnetizable hub cover |
| WO1993003482A1 (en) * | 1991-08-02 | 1993-02-18 | Mitsui Petrochemical Industries, Ltd. | Hub for optical recording medium and optical recording medium |
| US5983089A (en) * | 1994-09-26 | 1999-11-09 | Endgate Corporation | Slotline-mounted flip chip |
| US6265937B1 (en) | 1994-09-26 | 2001-07-24 | Endgate Corporation | Push-pull amplifier with dual coplanar transmission line |
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