JP2582798B2 - Method for manufacturing visible magnetic recording sheet - Google Patents
Method for manufacturing visible magnetic recording sheetInfo
- Publication number
- JP2582798B2 JP2582798B2 JP62211629A JP21162987A JP2582798B2 JP 2582798 B2 JP2582798 B2 JP 2582798B2 JP 62211629 A JP62211629 A JP 62211629A JP 21162987 A JP21162987 A JP 21162987A JP 2582798 B2 JP2582798 B2 JP 2582798B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- fine particles
- magnetic recording
- microcapsules
- binder
- 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 - Lifetime
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/06187—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with magnetically detectable marking
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
- G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Photoreceptors In Electrophotography (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 この発明は、情報を磁気的に繰返し記録することがで
き、かつ、記録された情報を視認可能に表示する可視磁
気記録シートの製造方法に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a visible magnetic recording sheet capable of repeatedly recording information magnetically and displaying the recorded information visually. is there.
解決しようとする技術課題 この発明者は、昭和62年８月６日に提出した特許願に
添付した明細書において、第４図に示すように、透明基
材（以下、基材というときもある。）Ａと、磁性微粒子
１、その磁性微粒子と異なる色又は光反射率を有し、か
つ、比重が磁性微粒子よりも大きい非磁性微粒子２、界
面活性剤及び溶剤を満たしたマイクロカプセル３を前記
透明基材Ａの裏面に層状に設けてなる表示層Ｂと、前記
表示層の裏面に設けられた磁気記録層Ｃとで構成し、磁
気記録層に対する情報記録により、磁化区域に対応する
マイクロカプセル内の磁性微粒子１が磁気記録層Ｃ側に
吸引されることに伴って非磁性微粒子２が表示面側（基
材Ａ側）に移動して、非磁化区域に対応するマイクロカ
プセルの表示面側の磁性微粒子との間に生じるコントラ
ストにより、磁気的に記録された情報を表示面に視認可
能に表示するようにした可視磁気記録シートを紹介し
た。Technical Problem to be Solved The present inventor disclosed in a specification attached to a patent application filed on August 6, 1987, as shown in FIG. 4, a transparent substrate (hereinafter sometimes referred to as a substrate). .) A, the magnetic fine particles 1, the non-magnetic fine particles 2 having a different color or light reflectance from the magnetic fine particles and having a specific gravity larger than that of the magnetic fine particles, and the microcapsules 3 filled with the surfactant and the solvent. A microcapsule comprising a display layer B provided in a layer on the back surface of a transparent base material A and a magnetic recording layer C provided on the back surface of the display layer. The non-magnetic fine particles 2 move toward the display surface side (substrate A side) as the magnetic fine particles 1 in the inside are attracted to the magnetic recording layer C side, and the display surface side of the microcapsule corresponding to the non-magnetized area. Between the magnetic fine particles Trust by introduced the visible magnetic recording sheets so as to visibly display the information magnetically recorded on the display surface.
このような構造の可視磁気記録シートは従来知られて
いない。そして、マイクロカプセルはこれを媒体に透視
可能に層状に固定する必要があり、また、層状のマイク
ロカプセルからなる表示層の裏面に磁性粉で形成される
磁気記録層を設ける必要がある。このような粉粒体から
構成される表示層及び磁気記録層を、磁気記録層の磁化
区域の磁界がマイクロカプセル内の磁性微粒子に確実に
及ぶように、かつ、記録された情報を鮮明に表示できる
ように、均一な厚さと粒子分布をもって形成することは
容易でない。A visible magnetic recording sheet having such a structure has not been conventionally known. It is necessary to fix the microcapsules in a layer so that the microcapsules can be seen through the medium, and it is necessary to provide a magnetic recording layer made of magnetic powder on the back surface of the display layer made of the layered microcapsules. The display layer and the magnetic recording layer made of such a granular material are displayed in such a manner that the magnetic field in the magnetization area of the magnetic recording layer reliably reaches the magnetic fine particles in the microcapsule and the recorded information is clearly displayed. As possible, it is not easy to form with a uniform thickness and particle distribution.
この発明は、上記の点に鑑み、工程順序を適切に設定
することにより、簡単な工程で表示層のマイクロカプセ
ルが均一な分布と厚みを有する平滑な層状に形成され、
磁気記録層がこれに対する記録による磁化部分の磁界が
表示層のマイクロカプセルの磁性微粒子に確実に及び、
また、表示面の表示品質が向上されるような、可視磁気
記録シート製造方法を提供しようとするものである。The present invention has been made in view of the above points, and by appropriately setting the process order, the microcapsules of the display layer are formed in a smooth layer having a uniform distribution and thickness in a simple process,
The magnetic recording layer ensures that the magnetic field of the magnetized portion due to recording reaches the magnetic fine particles of the microcapsules of the display layer,
It is another object of the present invention to provide a method for manufacturing a visible magnetic recording sheet that improves display quality of a display surface.
課題解決手段 この発明では、上記の課題を解決するため、第一工程
として、透明基材Ａの裏面に、バインダーと磁性微粒
子、その磁性微粒子と異なる色又は光反射率を有し、か
つ、比重が磁性微粒子よりも大きい非磁性微粒子、界面
活性剤及び溶剤を満たしたマイクロカプセルとを混練し
たものを塗布し、透明基材側からマイクロカプセル内の
磁性微粒子に磁界を加えて、マイクロカプセルを透明基
材側に引き込んで整列させ、次いで、乾燥硬化させて、
表示層Ｂを形成する。Means for Solving the Problems In the present invention, in order to solve the above problems, as a first step, a binder and magnetic fine particles, having a color or light reflectance different from those of the magnetic fine particles on the back surface of the transparent substrate A, and a specific gravity Is applied by kneading non-magnetic fine particles larger than magnetic fine particles, microcapsules filled with a surfactant and a solvent, and applying a magnetic field to the magnetic fine particles in the microcapsules from the transparent substrate side to make the microcapsules transparent. It is drawn into the substrate side and aligned, then dried and cured,
The display layer B is formed.
この塗布後の乾燥時間の間にバインダーの表面が表面
張力により平滑化して表示層の厚みが均一化する。ま
た、マイクロカプセルの分布が偏っているときはマイク
ロカプセルがその弾性により相互に離間して分布率が平
均化される。この見地からバインダーの粘性は可及的に
小さいことが良く、混練物を基材に塗布した後、その基
材を水平状態で放置している間に重力により、又は基材
に加えられる遠心力により、バインダー表面より突出し
ているマイクロカプセルもそのバインダー内に沈下し、
基材Ａ及び後に形成される磁気記録層Ｃに対する距離が
均一化する。During the drying time after the application, the surface of the binder is smoothed by the surface tension, and the thickness of the display layer becomes uniform. When the distribution of the microcapsules is uneven, the microcapsules are separated from each other by their elasticity, and the distribution rates are averaged. From this point of view, the viscosity of the binder is preferably as small as possible.After applying the kneaded material to the substrate, the centrifugal force applied to the substrate by gravity or while the substrate is left in a horizontal state Thereby, the microcapsules protruding from the binder surface also sink in the binder,
The distance to the substrate A and the magnetic recording layer C to be formed later becomes uniform.
第二工程として、乾燥硬化して形成された前記表示層
Ｂの裏面に、バインダーと粉状磁性材料とを混練したも
のを塗布し、透明基材側からマイクロカプセル内の磁性
微粒子に磁界を加えて、マイクロカプセルを透明基材側
に引き込んで整列させ、次いで、乾燥させて磁気記録層
Ｃを形成する。In the second step, a binder and a powdered magnetic material are kneaded on the back surface of the display layer B formed by drying and curing, and a magnetic field is applied to the magnetic fine particles in the microcapsules from the transparent substrate side. Then, the microcapsules are drawn into the transparent substrate side to be aligned, and then dried to form the magnetic recording layer C.
この時点では、表示層Ｂの裏面は硬化して平滑面にな
っているので、磁性材料を直接塗着することが容易にで
き、しかも、シール用フィルムが不要であるので、これ
が不要になった分だけ、磁気記録層の磁化区域に生じる
比較的弱い磁界をマイクロカプセル内の磁性微粒子まで
到達させることが容易になり、表示信頼性の向上に利点
がある。At this point, the back surface of the display layer B is hardened and becomes a smooth surface, so that the magnetic material can be easily applied directly, and the sealing film is unnecessary, which is no longer necessary. This makes it easier for a relatively weak magnetic field generated in the magnetized area of the magnetic recording layer to reach the magnetic fine particles in the microcapsule, which is advantageous in improving display reliability.
第三工程として、磁気記録層Ｃの裏面に磁気記録面保
護膜を接合又は塗布乾燥により形成する。基材Ａ、バイ
ンダーで硬化された表示層Ｂ、及び磁気記録層Ｃが一体
的に結合して相当な硬度を備えた状態において、磁気記
録層の裏面に磁気記録面保護膜を接合又は塗布乾燥によ
り形成するので、膜の形成が安定して確実容易に行え
る。As a third step, a magnetic recording surface protection film is formed on the back surface of the magnetic recording layer C by bonding or coating and drying. In a state where the base material A, the display layer B cured with the binder, and the magnetic recording layer C are integrally bonded and have considerable hardness, a magnetic recording surface protective film is bonded to the back surface of the magnetic recording layer or applied and dried. Thus, the film can be formed stably and easily.
この発明の実施例 次に、この発明の実施例を説明する。Next, an embodiment of the present invention will be described.
［第一工程］ 基材Ａはこの可視磁気記録シートに強度を備える材料
でもある。従って、この基材を支持体として、その一面
に、マイクロカプセル３と溶液状の透明バインダー４と
を混練した混練物を、例えばロールコーティング、ブラ
シコーティング、吹付けなどの既知の方法により薄い層
状に塗布する。基材Ａの厚みは、一例として、このシー
トを記録紙として用いる場合は20〜100μｍ、記録カー
ドとて用いる場合は100〜1000μｍであり、また、マイ
クロカプセルの平均直径は30〜50μｍ、マイクロカプセ
ル内に収容される磁性微粒子は平均直径100〜150Åの球
形の、例えば黒色の四三酸化鉄が使用され、非磁性微粒
子は平均直径３μｍ程度の球形の、例えば白色のバリウ
ムが使用される。従って、上記混練物の塗布厚みは40〜
60μｍ位である。[First Step] The base material A is also a material having strength for the visible magnetic recording sheet. Therefore, a kneaded material obtained by kneading the microcapsules 3 and the solution-like transparent binder 4 on one surface of the substrate as a support is formed into a thin layer by a known method such as roll coating, brush coating, or spraying. Apply. The thickness of the base material A is, for example, 20 to 100 μm when the sheet is used as a recording paper, and 100 to 1000 μm when the sheet is used as a recording card, and the average diameter of the microcapsules is 30 to 50 μm, and the microcapsules are used. The magnetic fine particles housed therein are spherical, for example, black iron trioxide having an average diameter of 100 to 150 °, and the non-magnetic fine particles are spherical, for example, white barium having an average diameter of about 3 μm. Therefore, the coating thickness of the kneaded material is 40 to
It is about 60 μm.
塗布された層には、これを断面において見た場合に、
マイクロカプセルが相互に均一な間隔をもって近接した
状態で一列に整列されることが望ましい。これは、マイ
クロカプセル３とバインダー４との混合比の調整により
実現可能である。The applied layer, when viewed in cross section,
It is desirable that the microcapsules are arranged in a row in close proximity to each other at a uniform interval. This can be realized by adjusting the mixing ratio between the microcapsules 3 and the binder 4.
混練物の塗布に続いて、この塗布されたバインダーを
自然乾燥又は強制乾燥させる。この場合、一例としてバ
インダー４の粘度を低くするとともに、基材Ａを下側に
して水平状態に保持して、必要ならば基材に適度な振動
を付加しながら、バインダーの上面から突出するマイク
ロカプセル３をバインダー内に沈下させる。これによ
り、各マイクロカプセルを第４図に示されているよう
に、可及的に磁気記録層Ｃに近づけ、かつ、距離を均一
にする。Following application of the kneaded material, the applied binder is air-dried or forced-dried. In this case, as an example, the viscosity of the binder 4 is lowered, and the substrate A is held horizontally with the substrate A facing downward. The capsule 3 is settled in the binder. Thereby, as shown in FIG. 4, each microcapsule is brought as close as possible to the magnetic recording layer C and the distance is made uniform.
この磁気記録層からの距離が近くて均一であること
は、磁気記録層に対する記録により磁化された部分から
の磁界が磁性微粒子にできるだけ強く、かつ、確実に及
ぶことができ、従って、記録された情報の表示品質を向
上させる。The fact that the distance from the magnetic recording layer is short and uniform means that the magnetic field from the portion magnetized by recording on the magnetic recording layer can reach the magnetic fine particles as strongly and reliably as possible. Improve the display quality of information.
バインダーの粘性により、重力又は振動によっては望
み通りにマイクロカプセルの位置調整効果が得られない
場合であっても、第２図に示すように、基材Ａにバイン
ダーとマイクロカプセルの混練物Bnfの塗布直後に、移
動する基材Ａの下側から永久磁石当は電磁石などの界磁
装置６用いてバインダーに強磁場を与えることにより、
マイクロカプセル３ないの磁性微粒子に基材Ａ方向吸引
力を作用させて、不揃いのマイクロカプセルを相互移動
により整列させて、第３図に示すように均一に分布させ
ることができる。The viscosity of the binder, also by gravity or vibration in a case where not obtained alignment effect of microcapsules as desired, as shown in FIG. 2, the kneaded product of the binder and the microcapsules to the substrate A B nf Immediately after the application of a permanent magnet from the lower side of the moving substrate A, a strong magnetic field is applied to the binder using a field device 6 such as an electromagnet.
By applying a suction force in the direction of the base material A to the magnetic fine particles without the microcapsules 3, the irregular microcapsules can be aligned by mutual movement and uniformly distributed as shown in FIG.
一つの界磁装置のみでは吸引移動量が少ない場合は、
複数個の界磁装置を基材Ａの移動方向に設置すれば、こ
れらによってマイクロカプセル３を基材Ａ側に一様に整
列させることができる。If the amount of suction movement is small with only one field device,
If a plurality of field devices are installed in the direction of movement of the substrate A, the microcapsules 3 can be uniformly aligned on the substrate A side.
［第二工程］ 上記のようにして、基材Ａの裏面に表示層Ｂが成形さ
れた後は、その表示層の裏面に、磁性粉とバインダーの
混練物を既知の方法により塗着し、通常の方法により乾
燥して、厚さが例えば10〜20μｍ程度の磁気記録層Ｃを
形成する。前工程における表示層Ｂの平滑化により、こ
の工程において、均一の膜厚に塗着することが容易にで
きる。[Second Step] After the display layer B is formed on the back surface of the base material A as described above, the kneaded material of the magnetic powder and the binder is applied to the back surface of the display layer by a known method, The magnetic recording layer C having a thickness of, for example, about 10 to 20 μm is formed by drying by a usual method. By smoothing the display layer B in the previous step, it is easy to apply a uniform film thickness in this step.
［第三工程］ 次に、最後の工程として、磁気記録層Ｃが乾燥固化し
た後に、一例として２〜３μｍ程度の不透明合成樹脂膜
を形成し、又は、同様なフィルムを貼着して、記録面保
護膜５を形成する。この保護膜５はこの可視磁気記録シ
ートに対して情報の書き込みをする磁気ヘッドの接触摩
擦による記録面の摩耗や磁気カードとして実現した場合
の携帯中の摩耗などをを防止する。さらに、この保護膜
は、これを印刷媒体としても利用できる。[Third Step] Next, as a final step, after the magnetic recording layer C is dried and solidified, an opaque synthetic resin film having a thickness of about 2 to 3 μm is formed as an example, or a similar film is stuck thereon to perform recording. The surface protection film 5 is formed. The protective film 5 prevents wear of the recording surface due to contact friction of the magnetic head which writes information on the visible magnetic recording sheet, and wear during carrying when the magnetic head is realized as a magnetic card. Further, the protective film can be used as a printing medium.
この発明の効果 上述のように、この発明によれば、透明基材の裏面
に、バインダーと磁性微粒子、その磁性微粒子と異なる
色又は光反射率を有し、かつ、比重が磁性微粒子よりも
大きい非磁性微粒子、界面活性剤及び溶剤を満たしたマ
イクロカプセルとを混練したものを塗布し、透明基材側
からマイクロカプセル内の磁性微粒子に磁界を加えて、
マイクロカプセルを透明基材側に引き込んで整列させ、
次いで、乾燥させて、表示層を形成した後、前記表示層
の裏面に、バインダーと磁性粉とを混練したものを塗布
し、乾燥させて磁気記録層を形成し、最後に、前記磁気
記録層の裏面に磁気記録面保護膜を形成するようにした
ので、簡単な工程で表示層のマイクロカプセルが均一な
分布と厚みを有する平滑な層状に形成され、磁気記録層
がこれに対する記録による磁化部分の磁界が表示層のマ
イクロカプセルの磁性微粒子に確実に及び、従って、表
示面の表示品質が向上された可視磁気記録シートを製造
することができる。Advantageous Effects of the Invention As described above, according to the present invention, on the back surface of the transparent substrate, the binder and the magnetic fine particles have different colors or light reflectance from the magnetic fine particles, and the specific gravity is larger than the magnetic fine particles. Non-magnetic fine particles, a mixture of kneaded microcapsules filled with a surfactant and a solvent is applied, and a magnetic field is applied to the magnetic fine particles in the microcapsules from the transparent substrate side,
Pull the microcapsules into the transparent substrate side and align them,
Next, after drying to form a display layer, a mixture obtained by kneading a binder and magnetic powder is applied to the back surface of the display layer, and dried to form a magnetic recording layer. Finally, the magnetic recording layer is formed. Since the magnetic recording surface protective film is formed on the back surface of the substrate, the microcapsules of the display layer are formed in a simple process into a smooth layer having a uniform distribution and thickness, and the magnetic recording layer is magnetized by recording. Thus, the visible magnetic recording sheet with improved display quality on the display surface can be manufactured.
第１図はこの発明の製造方法を説明する工程図、第２図
はマイクロカプセルの位置調整方法の一例を示す断面
図、第３図は位置調整後の状態を示す同様の断面図、第
４図はこの発明の製造方法により製造される可視磁気記
録シートの一部の拡大断面図である。 Ａ……基材、Ｂ……表示層、Ｃ……磁気記録層、 １……磁性微粒子、２……非磁性微粒子、 ３……マイクロカプセル、４……バインダー、 ５……記録面保護膜、６……界磁装置。FIG. 1 is a process diagram for explaining the manufacturing method of the present invention, FIG. 2 is a sectional view showing an example of a method for adjusting the position of the microcapsules, FIG. 3 is a similar sectional view showing a state after the position adjustment, FIG. The figure is an enlarged sectional view of a part of the visible magnetic recording sheet manufactured by the manufacturing method of the present invention. A: base material, B: display layer, C: magnetic recording layer, 1 ... magnetic fine particles, 2 ... non-magnetic fine particles, 3 ... microcapsules, 4 ... binder, 5 ... recording surface protective film , 6 ... Field device.
Claims (1)
性微粒子、その磁性微粒子と異なる色又は光反射率を有
し、かつ、比重が磁性微粒子よりも大きい非磁性微粒
子、界面活性剤及び溶剤を満たしたマイクロカプセルと
を混練したものを塗布し、透明基材側からマイクロカプ
セル内の磁性微粒子に磁界を加えて、マイクロカプセル
を透明基材側に引き込んで整列させ、次いで、乾燥させ
て、表示層を形成する工程、 （ロ）前記表示層の裏面に、バインダーと磁性材料とを
混練したものを塗布し、乾燥させて磁気記録層を形成す
る工程、 （ハ）前記磁気記録層の裏面に磁気記録面保護膜を形成
する工程、 とからなる可視磁気記録シートの製造方法。(1) A binder and magnetic fine particles, non-magnetic fine particles having a different color or light reflectance from the magnetic fine particles and a specific gravity larger than the magnetic fine particles, a surfactant on the back surface of the transparent base material. And a mixture of kneaded microcapsules filled with a solvent is applied, a magnetic field is applied to the magnetic fine particles in the microcapsules from the transparent substrate side, the microcapsules are drawn into the transparent substrate side, aligned, and then dried. (B) applying a kneaded mixture of a binder and a magnetic material to the back surface of the display layer and drying the mixture to form a magnetic recording layer; (c) the magnetic recording layer Forming a magnetic recording surface protection film on the back surface of the magnetic recording sheet.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62211629A JP2582798B2 (en) | 1987-08-26 | 1987-08-26 | Method for manufacturing visible magnetic recording sheet |
| US07/229,333 US5006422A (en) | 1987-08-06 | 1988-08-05 | Visual magnetic recording medium and method of making the same |
| GB8818697A GB2208493B (en) | 1987-08-06 | 1988-08-05 | Magnetic visual recording media and methods of making the same |
| DE3827015A DE3827015A1 (en) | 1987-08-06 | 1988-08-05 | MAGNETIC, VISUAL-EFFECTIVE DISPLAY DEVICE |
| KR1019880010057A KR970005352B1 (en) | 1987-08-06 | 1988-08-06 | Visual magnetic recording medium & method of making the same |
| HK121796A HK121796A (en) | 1987-08-06 | 1996-07-11 | Magnetic visual recording media and methods of making the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62211629A JP2582798B2 (en) | 1987-08-26 | 1987-08-26 | Method for manufacturing visible magnetic recording sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6455568A JPS6455568A (en) | 1989-03-02 |
| JP2582798B2 true JP2582798B2 (en) | 1997-02-19 |
Family
ID=16608937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62211629A Expired - Lifetime JP2582798B2 (en) | 1987-08-06 | 1987-08-26 | Method for manufacturing visible magnetic recording sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2582798B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4639614B2 (en) * | 2004-03-15 | 2011-02-23 | 富士ゼロックス株式会社 | Liquid crystal display element and manufacturing method thereof |
| JP6227455B2 (en) * | 2014-03-27 | 2017-11-08 | タキロンシーアイ株式会社 | Waterproof sheet fixing method and sheet mounting plate |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1023457A (en) * | 1974-06-10 | 1977-12-27 | Ncr Corporation | Magnetically-responsive color shutter |
| JPS56110944A (en) * | 1980-02-07 | 1981-09-02 | Ricoh Co Ltd | Recording material for forming magnetic latent image |
-
1987
- 1987-08-26 JP JP62211629A patent/JP2582798B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6455568A (en) | 1989-03-02 |
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