JPH0127495B2 - - Google Patents
Info
- Publication number
- JPH0127495B2 JPH0127495B2 JP56049404A JP4940481A JPH0127495B2 JP H0127495 B2 JPH0127495 B2 JP H0127495B2 JP 56049404 A JP56049404 A JP 56049404A JP 4940481 A JP4940481 A JP 4940481A JP H0127495 B2 JPH0127495 B2 JP H0127495B2
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- capacitive
- capacitance
- information signal
- carbon black
- 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.)
- Expired
Links
- 229910052783 alkali metal Inorganic materials 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- 150000003839 salts Chemical class 0.000 claims description 10
- 150000001340 alkali metals Chemical class 0.000 claims description 8
- 229910052784 alkaline earth metal Chemical class 0.000 claims description 8
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 6
- 238000011069 regeneration method Methods 0.000 claims description 2
- 230000008929 regeneration Effects 0.000 claims 1
- 230000007547 defect Effects 0.000 description 16
- 239000006229 carbon black Substances 0.000 description 14
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000010409 thin film Substances 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 239000010408 film Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 2
- -1 alkali metal salts Chemical class 0.000 description 2
- KRGNPJFAKZHQPS-UHFFFAOYSA-N chloroethene;ethene Chemical group C=C.ClC=C KRGNPJFAKZHQPS-UHFFFAOYSA-N 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 229920001038 ethylene copolymer Polymers 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 241000282320 Panthera leo Species 0.000 description 1
- 239000001825 Polyoxyethene (8) stearate Substances 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 1
- 150000001341 alkaline earth metal compounds Chemical class 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B9/00—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor
- G11B9/06—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor using record carriers having variable electrical capacitance; Record carriers therefor
- G11B9/061—Record carriers characterised by their structure or form or by the selection of the material; Apparatus or processes specially adapted for the manufacture of record carriers
- G11B9/063—Record carriers characterised by their structure or form or by the selection of the material; Apparatus or processes specially adapted for the manufacture of record carriers characterised by the selection of the material
- G11B9/068—Moulding resin compositions
Description
【発明の詳細な説明】
本発明は静電容量型記録媒体に係り、特に情報
信号を表面部の幾何学的形状の変化として記録さ
れており、表面を相対的に走査する再生針の電極
との間の静電容量が幾何学的形状変化に応じて変
化することにより情報信号が再生される静電容量
型記録媒体において、アルカリ金属及びアルカリ
土類金属化合物、特に無機塩の形のアルカリ金属
及びアルカリ土類金属化合物が実質的に含まれて
いないようにしておくことによつて、記録媒体が
例えば高湿度の雰囲気下におかれていても記録媒
体の再生に際しては例えば画面欠陥等が実質的に
ないものとなり、再生が良好なものとなる静電容
量型記録媒体を提供することを目的とする。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a capacitive recording medium, and in particular, information signals are recorded as changes in the geometrical shape of the surface, and the present invention relates to an electrode of a reproducing needle that scans the surface relatively. In capacitive recording media, in which an information signal is reproduced by changing the capacitance between By making the recording medium substantially free of alkaline earth metal compounds, for example, even if the recording medium is placed in a high humidity atmosphere, there will be virtually no screen defects, etc. when playing the recording medium. It is an object of the present invention to provide a capacitance type recording medium which has excellent playback performance and has excellent playback performance.
従来より、情報信号に応じて平面又は溝内にピ
ツトを形成し、幾何学的形状の変化として情報信
号を記録して情報信号記録媒体を得、この情報信
号記録媒体の記録トラツク上に電極を設けた再生
針を相対的に走査させ、再生針の電極と情報信号
記録媒体との間に形成される静電容量が上記幾何
学的形状の変化に応じて変化することを利用して
記録情報信号を再生するいわゆる静電容量再生方
式がある。 Conventionally, pits are formed in a plane or groove according to an information signal, the information signal is recorded as a change in geometrical shape to obtain an information signal recording medium, and electrodes are placed on the recording track of this information signal recording medium. Recorded information is recorded by scanning the provided reproducing needle relatively and utilizing the fact that the capacitance formed between the electrode of the reproducing needle and the information signal recording medium changes in accordance with the change in the geometrical shape. There is a so-called capacitive regeneration method for regenerating signals.
この種の静電容量再生方式に用いられる静電容
量型情報信号記録媒体は、例えば、幾何学的形状
変化をもつてプレス成型された記録媒体本体の表
面に、再生針の電極との間に静電容量を形成する
為の電極として例えば数百Åの金属薄膜を付着さ
せ、更にその上に金属薄膜を保護し、電極同士の
短絡を防止し、電極間の誘電率を上げる為に数百
Åの誘電体薄膜を付着させた構成のものが提案さ
れているが、この構造の記録媒体は、記録媒体本
体のプレス成型工程、金属薄膜付着工程、誘電体
薄膜付着工程等多くの製造工程を必要とし、製造
が複雑で面倒であり、大がかりな製造設備を必要
とし、製造コストが極めて高くなる等の欠点があ
る。 The capacitive information signal recording medium used in this type of capacitance reproduction method has, for example, a press-molded recording medium body with a geometric shape change, and a space between the electrode of the reproduction needle and the surface of the recording medium body. For example, a thin metal film of several hundred angstroms is deposited as an electrode to form capacitance, and on top of that, a thin metal film of several hundred angstroms is deposited to protect the thin metal film, prevent short circuits between the electrodes, and increase the dielectric constant between the electrodes. A recording medium with a structure in which a dielectric thin film of 100 Å is attached has been proposed, but a recording medium with this structure requires many manufacturing processes, such as a press molding process for the recording medium body, a process for attaching a metal thin film, and a process for attaching a dielectric thin film. The manufacturing process is complicated and troublesome, large-scale manufacturing equipment is required, and the manufacturing cost is extremely high.
そこで、例えば塩化ビニル―酢酸ビニル共重合
体等の樹脂に導電物質である例えばカーボンブラ
ツクを数十重量部混合してなる導電性を有するプ
ラスチツクを原料としてプレス成型し、情報信号
を幾何学的形状の変化として記録した静電容量型
情報信号記録媒体が提案されており、この記録媒
体は、記録媒体そのものと再生針電極との間に静
電容量が形成される為、金属薄膜付着工程が不要
で、又カーボンブラツクの微粉末粒子自体が樹脂
によつて被覆されている為、誘電体薄膜付着工程
が不要となり、製造が極めて簡単で低コストなも
のとなるといつた特長があるとされている。 Therefore, a conductive plastic made by mixing several tens of parts by weight of a conductive substance such as carbon black with a resin such as vinyl chloride-vinyl acetate copolymer is press-molded as a raw material, and the information signal is shaped into a geometric shape. A capacitance-type information signal recording medium has been proposed as a change in the recording medium, and since a capacitance is formed between the recording medium itself and the playback needle electrode, there is no need for the process of attaching a metal thin film. Also, since the carbon black fine powder particles themselves are coated with resin, there is no need to apply a dielectric thin film, making manufacturing extremely simple and low-cost. .
又、塩化ビニル―酢酸ビニル共重合体の代りに
塩化ビニル―セチルビニルエーテル共重合体等の
塩化ビニル系樹脂を用いることも提案されてい
る。 It has also been proposed to use a vinyl chloride resin such as a vinyl chloride-cetyl vinyl ether copolymer instead of a vinyl chloride-vinyl acetate copolymer.
しかし、このような例えばカーボンブラツク等
の導電性物質等を含有した素材で、例えば静電容
量型情報信号記録媒体を作り、この記録媒体を、
例えば高温高湿の環境のもとにおいていると、記
録媒体の再生に際して、例えば再生画面欠陥が生
じるといつた致命的欠点が生じるに至つた。 However, for example, a capacitive information signal recording medium is made from a material containing a conductive substance such as carbon black, and this recording medium is
For example, if the recording medium is kept in an environment of high temperature and humidity, fatal defects such as reproduction screen defects occur when the recording medium is reproduced.
本発明者は、再生画面欠陥といつた致命的欠点
が何故起きるのかを検討した結果、例えば塩化ビ
ニル系樹脂に加えているカーボンブラツクには、
通常塩化ナトリウム、塩化カルシウムあるいは炭
酸ナトリウム等アルカリ金属あるいはアルカリ土
類金属の無機塩が微量混ざつており、これらの金
属塩が記録媒体中に含まれていると、例えば高温
高湿下では静電容量型記録媒体に凸状欠陥も起こ
し、再生に際してはこの凸状欠陥の故に情報信号
が欠除されて、例えばテレビ画面の画像が一部欠
けてしまつていたり、あるいは針飛び等の原因と
なることを見い出したのである。 As a result of studying why fatal defects such as reproduction screen defects occur, the inventor found that, for example, carbon black added to vinyl chloride resin has
Normally, trace amounts of inorganic salts of alkali metals or alkaline earth metals such as sodium chloride, calcium chloride, or sodium carbonate are mixed in, and if these metal salts are contained in the recording medium, static electricity may be generated under high temperature and high humidity conditions. Convex defects can also occur in capacitive recording media, and during playback, information signals are omitted due to these convex defects, causing, for example, parts of the image on a television screen to be missing, or needle skipping. I found out what happened.
そこで、本発明者は、例えば塩化ビニル系樹脂
等に混入する導電性物質としての、例えばカーボ
ンブラツクを、例えば水洗いした後乾燥しておく
ことによつて、アルカリ金属あるいはアルカリ土
類金属等の無機塩を実質的に除去しておくことに
より、静電容量型記録媒体中にこれらの金属塩が
含まれないようにしたのである。すなわち、図面
に示す如く、例えばタンク１中にカーボンブラツ
クと例えばイオン交換水を入れて撹拌扇で充分に
撹拌した後、ケーキプレス機及び減圧乾燥機２に
送り、水分をある程度除去した後、乾燥機３に送
り込み、含水率が約２％程度あるいはそれ以下に
乾燥し、計量器４を通してアルカリ金属塩等を含
んでいないカーボンブラツクを所定量高速撹拌機
５に入れ、塩化ビニル系樹脂等の記録媒体素材と
充分に混合し、所定の工程を経て、例えば静電容
量型ビデオデイスクを作つた。 Therefore, the inventor of the present invention has developed a method of removing inorganic materials such as alkali metals or alkaline earth metals by washing, for example, carbon black as a conductive substance mixed in vinyl chloride resin, etc., and then drying it. By substantially removing the salts, it is possible to prevent these metal salts from being contained in the capacitive recording medium. That is, as shown in the drawing, carbon black and ion-exchanged water, for example, are placed in a tank 1, thoroughly stirred with a stirring fan, and then sent to a cake press and a vacuum dryer 2 to remove some moisture and then dried. A predetermined amount of carbon black, which is dried to a moisture content of approximately 2% or less, and which does not contain alkali metal salts, etc., is put into a high-speed stirrer 5 through a measuring device 4, and records of vinyl chloride resin, etc. For example, a capacitive video disc is produced by thoroughly mixing with a media material and going through a predetermined process.
以下、本発明に係る静電容量型記録媒体の具体
例について説明する。 Hereinafter, specific examples of the capacitive recording medium according to the present invention will be described.
実施例 １
カーボンブラツクとしてライオンアクゾ社のケ
ツチエンブラツクECを水10に対し１Kg加え、
上記の処理工程をへて、水洗いによりカーボンブ
ラツクよりアルカリ金属及びアルカリ土類金属の
無機塩を除去する。この水洗いした水を分析した
結果、アルカリ金属及びアルカリ土類金属の無機
塩が検出された。Example 1 As carbon black, add 1 kg of Lion Akzo's Ketchen Black EC to 10 parts of water.
After the above treatment steps, inorganic salts of alkali metals and alkaline earth metals are removed from the carbon black by washing with water. As a result of analyzing the washed water, inorganic salts of alkali metals and alkaline earth metals were detected.
他方、ヘンシエル形高速ミキサー内に、塩化ビ
ニル系樹脂、例えば塩化ビニル約99.5〜90重量
％、エチレン約0.5〜10重量％の組成の共重合体、
例えば日産化学工業(株)製のニツサンビニール
E430を約100重量部、ジブチル錫ラウレートを約
３重量部、エポキシ化した大豆油を約0.5重量部、
ジメチルポリシロキサンを約0.7重量部入れ、充
分に撹拌する。尚、撹拌終了時での樹脂温度は約
70℃であつた。次に、上記処理を行なつてアルカ
リ金属塩等を除去したカーボンブラツクを約22重
量部加え、充分に撹拌した後、これらの混合粉末
を、例えば２軸の８インチオープンロールで約10
分間混練する。この際のロールの表面温度は約
160℃であつた。 On the other hand, in a Henschel type high speed mixer, a vinyl chloride resin, for example, a copolymer having a composition of about 99.5 to 90% by weight of vinyl chloride and about 0.5 to 10% by weight of ethylene,
For example, Nissan Vinyl manufactured by Nissan Chemical Industries, Ltd.
Approximately 100 parts by weight of E430, approximately 3 parts by weight of dibutyltin laurate, approximately 0.5 parts by weight of epoxidized soybean oil,
Add about 0.7 parts by weight of dimethylpolysiloxane and stir thoroughly. Furthermore, the resin temperature at the end of stirring is approximately
It was 70℃. Next, about 22 parts by weight of carbon black from which alkali metal salts etc. have been removed by the above treatment is added, and after thorough stirring, the mixed powder is rolled for about 10 minutes using, for example, a twin-screw 8-inch open roll.
Knead for a minute. The surface temperature of the roll at this time is approximately
It was 160℃.
混練後、シート状に切り出し、約５mm角のペレ
ツトにして押出機に通し、押し出し予備成型を行
なう。この押出機の温度は約160℃であつた。 After kneading, the mixture is cut into sheets, made into approximately 5 mm square pellets, and passed through an extruder for extrusion preforming. The temperature of this extruder was about 160°C.
そして、予備成型した材料を、金型にビデオデ
イスクのスタンパーを取り付けた圧縮成型機にて
約140Kg／cm2の圧力で60秒サイクルでプレスして、
静電容量型ビデオデイスクを作る。 Then, the preformed material is pressed in a compression molding machine equipped with a video disc stamper in the mold at a pressure of approximately 140 kg/cm 2 for a 60 second cycle.
Make a capacitive video disk.
実施例 ２
米国キヤボツト社のCSX―150A2のカーボンブ
ラツクを用いて、実施例１と同様してビデオデイ
スクを作る。Example 2 A video disc was made in the same manner as in Example 1 using CSX-150A2 carbon black manufactured by Cabot Corporation, USA.
比較例 １
実施例１において、カーボンブラツクに対して
水洗い処理を行なわず、すなわちアルカリ金属及
びアルカリ土類金属の無機塩を除去せずに、ケツ
チエンブラツクECをそのまま用いて、実施例１
と同様にしてビデオデイスクを作る。Comparative Example 1 In Example 1, the carbon black was not washed with water, that is, the inorganic salts of alkali metals and alkaline earth metals were not removed, and Ketchen Black EC was used as it was.
Create a video disc in the same way.
比較例 ２
実施例１において、水洗い処理したカーボンブ
ラツクに、カーボンブラツク１Kg当たり約0.5ｇ
の塩化ナトリウムを加えたものを用い、実施例１
と同様にしてビデオデイスクを作る。Comparative Example 2 In Example 1, about 0.5 g per 1 kg of carbon black was added to the water-washed carbon black.
Example 1
Create a video disc in the same way.
上記のようにして得られた静電容量型ビデオデ
イスクを、例えば温度45℃、相対湿度90％の雰囲
気下で48時間放置した後、再生装置に装着して再
生を行ない、10分間当り再生画像に生じた画面欠
陥数を測定すると、実施例１のものについては約
10個、実施例２のものについては約1.5個、比較
例１のものについては約120個、比較例２のもの
については約100個の画面欠陥が起きた。 The capacitive video disk obtained as described above is left for 48 hours in an atmosphere with a temperature of 45°C and a relative humidity of 90%, and then is attached to a playback device and played back. When measuring the number of screen defects that occurred in Example 1, it was found that approximately
10 screen defects occurred, about 1.5 screen defects occurred in Example 2, about 120 screen defects occurred in Comparative Example 1, and about 100 screen defects occurred in Comparative Example 2.
尚、記録媒体の主成分の素材として塩化ビニル
―エチレン共重合体、特にエチレンが約0.5〜10
重量％の組成の塩化ビニル―エチレン共重合体を
用いていると、高温において記録媒体の耐久性が
著しく優れており、又記録媒体の加工が極めて容
易である。 The main component of the recording medium is vinyl chloride-ethylene copolymer, especially ethylene with a content of about 0.5 to 10
When a vinyl chloride-ethylene copolymer having a composition of % by weight is used, the durability of the recording medium at high temperatures is extremely excellent, and the processing of the recording medium is extremely easy.
又、上記比較例２においてはNaClを加えた場
合であるが、NaClの代りにNa2CO3あるいは
CaCl2等を用いて同様に行ない、得られたビデオ
デイスクを高温高湿の雰囲気下においていると、
再生に際しては画面欠陥が多く起き、再生が劣悪
なものであつた。 In addition, in Comparative Example 2 above, NaCl was added, but Na 2 CO 3 or Na 2 CO 3 or NaCl was added instead of NaCl.
If you do the same thing using CaCl 2 etc. and place the resulting video disk in a high temperature and high humidity atmosphere,
During playback, many screen defects occurred and playback was poor.
又、これらアルカリ金属あるいはアルカリ土類
金属の無機塩が約60ppm以下の場合には、ビデオ
デイスクの再生に際して画面欠陥はそれ程起きて
なく、再生がそれ程劣悪なものではなかつた。 Furthermore, when the content of these inorganic salts of alkali metals or alkaline earth metals was about 60 ppm or less, screen defects did not occur as much when playing video discs, and playback was not so poor.
上述の如く、本発明に係る静電容量型記録媒体
は、情報信号が表面部の幾何学的形状の変化とし
て記録されており、表面を相対的に走査する再生
針の電極との間の静電容量が幾何学的形状変化に
応じて変化することにより情報信号が再生される
導電性物質を含む樹脂で成形された静電容量型記
録媒体であつて、この記録媒体中に含まれている
アルカリ金属及びアルカリ土類金属の無機塩が略
60ppm以下であるので、このような静電容量型記
録媒体を高温高湿、特に高湿の雰囲気下に放置し
ていても静電容量型記録媒体には実質的に凸状欠
陥が生じず、従つてこのような凸状欠陥が発生し
たことによつて記録情報信号が欠除するようにな
ることがなく、又針飛び等の現象は起きず、再生
は良好であり、従つて静電容量型記録媒体の保存
が簡単となり、この記録媒体を製造後水洗する必
要がないから、水洗により記録媒体に傷をつける
恐を回避でき、又、水洗作業工程を省けるから作
業能率を高めることができる等の特長を有する。 As described above, in the capacitive recording medium according to the present invention, information signals are recorded as changes in the geometrical shape of the surface, and static electricity between the electrode of the reproducing needle and the reproducing needle that scans the surface relatively is recorded. A capacitive recording medium molded from a resin containing a conductive substance, in which an information signal is reproduced by changing the capacitance according to a change in geometric shape, and is contained in the recording medium. Abbreviation for inorganic salts of alkali metals and alkaline earth metals
Since it is 60 ppm or less, even if such a capacitive recording medium is left in a high temperature and high humidity atmosphere, especially in a high humidity atmosphere, convex defects will not substantially occur in the capacitive recording medium. Therefore, the recorded information signal will not be deleted due to the occurrence of such a convex defect, and phenomena such as needle skipping will not occur, and reproduction will be good. It becomes easy to store the type recording medium, and since there is no need to wash the recording medium with water after manufacturing, it is possible to avoid the risk of damaging the recording medium due to washing with water, and it is possible to improve work efficiency because the washing process can be omitted. It has the following features.
図面は、本発明に係る静電容量型記録媒体の製
造に際して用いる導電物質の前処理工程の装置の
説明図である。
１…タンク、３…乾燥機、５…高速撹拌機。
The drawing is an explanatory diagram of an apparatus for a pretreatment process of a conductive material used in manufacturing a capacitive recording medium according to the present invention. 1...tank, 3...dryer, 5...high speed agitator.
Claims (1)
て記録されており、表面を相対的に走査する再生
針の電極との間の静電容量が幾何学的形状変化に
応じて変化することにより情報信号が再生される
導電性物質を含む樹脂で成形された静電容量型記
録媒体であつて、この記録媒体中に含まれている
アルカリ金属及びアルカリ土類金属の無機塩が略
60ppm以下であることを特徴とする静電容量型記
録媒体。1 The information signal is recorded as a change in the geometric shape of the surface, and the capacitance between the electrode of the regeneration needle that scans the surface relatively changes according to the change in the geometric shape. A capacitive recording medium molded from a resin containing a conductive substance from which information signals are reproduced, and the inorganic salts of alkali metals and alkaline earth metals contained in this recording medium are
A capacitive recording medium characterized by a capacitance of 60 ppm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4940481A JPS57167151A (en) | 1981-04-03 | 1981-04-03 | Recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4940481A JPS57167151A (en) | 1981-04-03 | 1981-04-03 | Recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57167151A JPS57167151A (en) | 1982-10-14 |
| JPH0127495B2 true JPH0127495B2 (en) | 1989-05-29 |
Family
ID=12830102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4940481A Granted JPS57167151A (en) | 1981-04-03 | 1981-04-03 | Recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57167151A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010023911A1 (en) | 2008-08-29 | 2010-03-04 | オイレス工業株式会社 | Multi-layer sliding member and rack guide in rack-and-pinion steering device for automobiles using same |
| US10640142B2 (en) | 2015-04-24 | 2020-05-05 | Oiles Corporation | Multilayered sliding member and rack-and-pinion type steering apparatus for automobile using the same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57172555A (en) * | 1981-04-17 | 1982-10-23 | Matsushita Electric Ind Co Ltd | Disk type recording medium and its manufacture |
| JPS61110352A (en) * | 1984-11-02 | 1986-05-28 | Victor Co Of Japan Ltd | Information signal recording medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5683854A (en) * | 1979-11-07 | 1981-07-08 | Rca Corp | Production of video disk |
-
1981
- 1981-04-03 JP JP4940481A patent/JPS57167151A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5683854A (en) * | 1979-11-07 | 1981-07-08 | Rca Corp | Production of video disk |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010023911A1 (en) | 2008-08-29 | 2010-03-04 | オイレス工業株式会社 | Multi-layer sliding member and rack guide in rack-and-pinion steering device for automobiles using same |
| US10640142B2 (en) | 2015-04-24 | 2020-05-05 | Oiles Corporation | Multilayered sliding member and rack-and-pinion type steering apparatus for automobile using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57167151A (en) | 1982-10-14 |
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