JPH04233581A - Magnetic display system - Google Patents
Magnetic display systemInfo
- Publication number
- JPH04233581A JPH04233581A JP2409271A JP40927190A JPH04233581A JP H04233581 A JPH04233581 A JP H04233581A JP 2409271 A JP2409271 A JP 2409271A JP 40927190 A JP40927190 A JP 40927190A JP H04233581 A JPH04233581 A JP H04233581A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic powder
- light
- magnetic
- microcapsules
- display
- 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
- 239000006247 magnetic powder Substances 0.000 claims abstract description 193
- 239000003094 microcapsule Substances 0.000 claims abstract description 147
- 239000002245 particle Substances 0.000 claims abstract description 54
- 239000007788 liquid Substances 0.000 claims abstract description 48
- 239000011247 coating layer Substances 0.000 claims abstract description 19
- 239000000758 substrate Substances 0.000 claims description 19
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 229920006254 polymer film Polymers 0.000 claims description 6
- 229910001047 Hard ferrite Inorganic materials 0.000 claims description 3
- 239000000843 powder Substances 0.000 abstract description 25
- 230000003311 flocculating effect Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 12
- 239000007864 aqueous solution Substances 0.000 description 11
- 239000010410 layer Substances 0.000 description 11
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 108010010803 Gelatin Proteins 0.000 description 6
- 229920000159 gelatin Polymers 0.000 description 6
- 239000008273 gelatin Substances 0.000 description 6
- 235000019322 gelatine Nutrition 0.000 description 6
- 235000011852 gelatine desserts Nutrition 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000012463 white pigment Substances 0.000 description 6
- 230000031700 light absorption Effects 0.000 description 5
- 239000004408 titanium dioxide Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000002775 capsule Substances 0.000 description 4
- 230000008094 contradictory effect Effects 0.000 description 4
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 4
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 description 3
- 229920000084 Gum arabic Polymers 0.000 description 3
- 241000978776 Senegalia senegal Species 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 235000010489 acacia gum Nutrition 0.000 description 3
- 239000000205 acacia gum Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000001579 optical reflectometry Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、マイクロカプセル内で
光吸収性磁性粉と、光反射性非磁性粉の上下の位置を転
換することによって入射光を吸収または反射させて両者
の間に明暗のコントラスト像を形成する磁気ディスプレ
ーシステムに関する。[Industrial Application Field] The present invention absorbs or reflects incident light by changing the vertical positions of a light-absorbing magnetic powder and a light-reflecting non-magnetic powder within a microcapsule. The present invention relates to a magnetic display system that forms a contrast image.
【０００２】0002
【従来の技術】磁気ディスプレーシステムに類する従来
の技術には、透明プラスチックシートの全面に、一辺及
び深さ各２ミリメートル程度のハニカム状の窪みを設け
るように成型して、そのハニカム状の窪みの中に白色顔
料液体と磁性粉を注入し、注入物が外部に漏れないよう
に透明シートによって密封してなる磁気ディスプレーシ
ステムがある。これは磁気ディスプレー板の裏面の一端
より他端に棒状の永久磁石をディスプレー面全面に亘っ
て移動することによってハニカム状の窪みのなかの磁性
粉をディスプレー板の裏面に沈めて、表面には白色顔料
の白色を示すようにして、白色にしたディスプレーの表
面にペン状永久磁石の先端部を接触させて、接触部分の
磁性粉を表面に移動して像を形成するシステムである。[Prior Art] A conventional technology similar to a magnetic display system involves molding a transparent plastic sheet so that honeycomb-shaped depressions of approximately 2 mm on each side and depth are provided on the entire surface of the sheet. There is a magnetic display system in which a white pigment liquid and magnetic powder are injected into the container and sealed with a transparent sheet to prevent the injected material from leaking outside. This is done by moving a rod-shaped permanent magnet from one end of the back surface of the magnetic display board to the other end over the entire display surface, causing the magnetic powder in the honeycomb-shaped recesses to sink to the back surface of the display board, leaving a white color on the surface. In this system, the tip of a pen-shaped permanent magnet is brought into contact with the surface of a whitened display to show the white color of the pigment, and the magnetic powder in the contact area is moved to the surface to form an image.
【０００３】磁気ディスプレーシステムの第２の先行技
術として、本願出願人が出願した磁気ディスプレーシス
テム（特開平１−１４５６３７号）がある。このシステ
ムは、形状異方性を有する磁性粉を封入したマイクロカ
プセルを非磁性体基板に塗布したディスプレーと、磁性
粉の極性配向の転換による文字や像形成及び消去の手段
として永久磁石を用いている。A second prior art example of a magnetic display system is a magnetic display system (Japanese Patent Laid-Open No. 1-145637) filed by the applicant of the present invention. This system uses a display in which microcapsules containing magnetic powder with shape anisotropy are coated on a non-magnetic substrate, and a permanent magnet as a means of forming and erasing characters and images by changing the polar orientation of the magnetic powder. There is.
【０００４】また、第３の先行技術として本願出願人が
出願した磁気ディスプレーシステム（特開平２−１４６
０８２号）もマイクロカプセル中に磁性粉と非磁性粉を
封入して基板上に塗布配列したディスプレーで、マイク
ロカプセル中で磁性粉と非磁性粉の位置転換による文字
や像の形成及び消去の手段として永久磁石を用いている
。[0004] Furthermore, as a third prior art, a magnetic display system (Japanese Unexamined Patent Publication No. 2-146
No. 082) is also a display in which magnetic powder and non-magnetic powder are enclosed in microcapsules and coated and arranged on a substrate, and is a means of forming and erasing characters and images by changing the positions of magnetic powder and non-magnetic powder in the microcapsules. A permanent magnet is used as the magnet.
【０００５】[0005]
【発明が解決しようとする課題】上記従来の磁気ディス
プレーシステムのうち最初に挙げた先行技術にあっては
、ハニカムルームの中の磁性粉を裏面より表面に移動さ
せて像を形成するため、形成する線像はハニカムルーム
以下に細くすることは不可能であり、またハニカムルー
ムのサイズ（周囲各辺の長さと深さ）を現行の数ミリメ
ートルのオーダー以下に成型することは技術的に困難で
ある。更にハニカムルームを設けるための成型と白色顔
料液体と磁性粉を封入する工程は容易でないことや、ハ
ニカムルームを大型の黒板サイズに成型することは技術
的にほとんど不可能に近く、仮に技術的に可能であって
も高コストになることは避けられない。更にそのような
大きなサイズの全面に設けるハニカムルームの中に白色
顔料液体と磁性粉を注入，密封することはこれまた技術
的に至難であること、また逆に上記の構造のためにポケ
ットサイズのように小さなサイズのディスプレーにする
ことも容易でないこと、また仮に小型化しても、ハニカ
ムルーム構造には数ミリメートルの厚みがあるため携帯
用には過大な重量になることも避けられないなどの欠点
がある。[Problems to be Solved by the Invention] Among the conventional magnetic display systems mentioned above, in the first-mentioned prior art, the magnetic powder in the honeycomb room is moved from the back side to the front side to form an image. It is impossible to make the line image thinner than the honeycomb room, and it is technically difficult to mold the honeycomb room size (length and depth of each peripheral side) to less than the current order of several millimeters. be. Furthermore, the process of molding the honeycomb room and enclosing the white pigment liquid and magnetic powder is not easy, and it is technically almost impossible to mold the honeycomb room to the size of a large blackboard. Even if it is possible, it is unavoidable that it will be expensive. Furthermore, it is technically extremely difficult to inject and seal the white pigment liquid and magnetic powder into such a large honeycomb chamber, and conversely, due to the above-mentioned structure, it is difficult to inject and seal the white pigment liquid and magnetic powder into a honeycomb chamber of a pocket size. Disadvantages include the fact that it is not easy to make a display as small as this, and even if it were made smaller, the honeycomb room structure is several millimeters thick, so it would inevitably be too heavy for portable use. There is.
【０００６】また第２の先行技術として挙げた本願出願
人の出願した特開平１−１４５６３７号の磁気ディスプ
レーシステムは、前者のプラスティック成型によるハニ
カムルームに磁性粉と白色顔料を密封したディスプレー
システムと比較すると、形成できる文字や像の質がきわ
めて優れていること、また僅かな磁束密度によって磁性
粉の極性配向を転換できること、さらには大小自由なサ
イズのディスプレーが容易に得られることなどの点では
るかに進歩している。しかしながら、このシステムに用
いる磁性粉は垂直配向時の光吸収と水平配向時の光反射
のコントラストを強くする必要上、フェライトや酸化鉄
のように大量生産されている磁性粉の利用は不可能で、
表面に光沢が得られるニッケル等の合金磁性粉で、しか
も極性が得られ易いフレーク状（長辺を有する偏平形状
）の形状異方性をもった磁性粉が要求されるため、高コ
ストになってしまう欠点がある。[0006] Also, the magnetic display system disclosed in Japanese Patent Laid-Open No. 1-145637 filed by the present applicant, cited as the second prior art, is compared with the former display system in which magnetic powder and white pigment are sealed in a honeycomb room made of plastic molding. As a result, the quality of characters and images that can be formed is extremely high, the polar orientation of the magnetic powder can be changed with a small amount of magnetic flux density, and displays of any size can be easily obtained. progress has been made. However, the magnetic powder used in this system needs to have a strong contrast between light absorption when vertically aligned and light reflection when horizontally aligned, so it is impossible to use mass-produced magnetic powders such as ferrite and iron oxide. ,
Alloy magnetic powder, such as nickel, that provides a glossy surface, and magnetic powder that has flake-like (flat shape with long sides) shape anisotropy that makes it easy to obtain polarity is required, which results in high costs. There are drawbacks to this.
【０００７】つぎに第３の先行技術として挙げた本願出
願人の出願した特開平２−１４６０８２号は光吸収性磁
性粉と光反射性非磁性粉を油状液体中に分散してマイク
ロカプセルに封入して基板上に塗布する構造を特徴とす
るディスプレーで、前記２者に比較するとつぎに挙げる
幾多の利点がある。即ち基板に設けたハニカムルーム中
に磁性粉と白色顔料液体を封入する先行技術に比較し、
はるかに微小粒径のマイクロカプセルを利用することに
よって、形成する文字や画像の縁辺部が尖鋭化されるこ
と、ディスプレーの一定面積当り必要とする磁性粉，非
磁性粉，分散油状液体量が著しく少量となる省資源化が
可能なこと、ハニカムルーム成型、内容物の充填密封工
程に比較して著しく省コスト化が可能なこと、マイクロ
カプセルを塗布する基板に硬質シート、あるいは軟質可
撓性フイルム等の選択が可能となり、ボード型，シート
型，ロールスクロール型等のさまざまなディスプレー形
態を選択できること、量産シートより断截によって大小
自由にサイズの選択ができることなどが挙げられる。[0007] Next, as the third prior art, Japanese Patent Application Laid-Open No. 2-146082 filed by the present applicant discloses a method in which light-absorbing magnetic powder and light-reflecting non-magnetic powder are dispersed in an oily liquid and encapsulated in microcapsules. This is a display characterized by a structure in which the liquid is coated on a substrate, and has a number of advantages as follows when compared with the above two types. That is, compared to the prior art in which magnetic powder and white pigment liquid are sealed in a honeycomb room provided on the substrate,
By using microcapsules with a much smaller particle size, the edges of characters and images formed can be sharpened, and the amount of magnetic powder, non-magnetic powder, and dispersed oily liquid required per fixed area of the display can be significantly reduced. It is possible to save resources because it requires a small amount, and it is possible to significantly reduce costs compared to honeycomb room molding and filling and sealing processes. The substrate on which the microcapsules are applied can be a hard sheet or a soft flexible film. It is possible to select from various display formats such as board type, sheet type, roll scroll type, etc., and the size can be freely selected by cutting from mass-produced sheets.
【０００８】また、マイクロカプセル内で磁性粉の極性
配向を転換するディスプレーシステムの先行技術に比し
、使用磁性粉が圧倒的に低コストであること、文字や画
像形成・消去手段が著しく単純化できることなどが挙げ
られる。[0008] Furthermore, compared to the prior art display system in which the polar orientation of magnetic powder is changed within a microcapsule, the cost of the magnetic powder used is overwhelmingly low, and the means for forming and erasing characters and images is significantly simplified. There are things you can do.
【０００９】以上述べたように、本願出願人が出願した
特開平２−１４６０８２号は第１，第２先行技術として
引用したディスプレーシステムと比較して多くの利点を
有しているが、本発明ではこの特開平２−１４６０８２
号にさらに改良を加えて、主としてディスプレー上に形
成する文字や画像の良質化を達成するものである。As described above, the Japanese Patent Application Laid-Open No. 2-146082 filed by the applicant of the present application has many advantages compared to the display systems cited as the first and second prior art, but the present invention Now, this Japanese Patent Application Publication No. 2-146082
Further improvements have been made to this issue, primarily to improve the quality of characters and images formed on the display.
【００１０】0010
【課題を解決するための手段】本発明は上記課題を達成
するために、非磁性体基板に、油状液体中にそれぞれ分
散または溶解した光吸収性の優れた表面特性を有する磁
性粉と光反射性の優れた特性を有する非磁性粉を封入し
たマイクロカプセル塗布層を施す構造を有するディスプ
レーと、そのディスプレーに塗布されているマイクロカ
プセル塗布層の全面に亘ってマイクロカプセル内の光吸
収性磁性粉をディスプレーの裏面側に吸引移動させ、そ
の結果として光反射性の非磁性粉をディスプレーの表面
側に移動させる手段として、及び前記によってディスプ
レーの裏面側に吸引移動した光吸収性磁性粉を局部的に
表面側に吸引移動させてその部分の光反射性非磁性粉の
位置を反転させることによって文字や像を形成させる手
段として永久磁石を用いた磁気装置よりなる磁気ディス
プレーシステムにおいて、光吸収性磁性粉と、光反射性
非磁性粉が分散される油状液体を封入するマイクロカプ
セルは、その壁膜が実質的に透明で、内容物を半永久的
に保持できる強度を有する重合体膜で形成し、その最大
粒径１，０００ミクロン、最小粒径１００ミクロンの範
囲にある複数粒径のマイクロカプセルを適宜の比率で配
合した構成とした。[Means for Solving the Problems] In order to achieve the above-mentioned problems, the present invention provides a non-magnetic substrate with magnetic powder having excellent light-absorbing surface characteristics and light-reflecting powder dispersed or dissolved in an oily liquid. A display has a structure in which a microcapsule coating layer is applied that encapsulates non-magnetic powder with excellent magnetic properties, and a light-absorbing magnetic powder inside the microcapsules is applied over the entire surface of the microcapsule coating layer coated on the display. as a means for attracting and moving the light-reflecting non-magnetic powder to the back side of the display, and as a result moving the light-reflecting non-magnetic powder to the front side of the display, and locally localizing the light-absorbing magnetic powder that has been attracted and moved to the back side of the display by the above method. In a magnetic display system consisting of a magnetic device that uses a permanent magnet as a means of forming characters or images by attracting and moving the light-reflecting non-magnetic powder to the surface side and reversing the position of the light-reflecting non-magnetic powder in that part, a light-absorbing magnetic A microcapsule enclosing a powder and an oily liquid in which the light-reflecting non-magnetic powder is dispersed is formed of a polymer film whose wall film is substantially transparent and strong enough to retain the contents semi-permanently, Microcapsules having a plurality of particle sizes ranging from a maximum particle size of 1,000 microns to a minimum particle size of 100 microns were blended in an appropriate ratio.
【００１１】前記マイクロカプセル内の油状液体に分散
する磁性粉は最小粒径０．２ミクロン、最大粒径数ミク
ロンの範囲の一種または数種の粒径を組合せた。The magnetic powder dispersed in the oily liquid in the microcapsules has one or more particle sizes ranging from a minimum particle size of 0.2 microns to a maximum particle size of several microns.
【００１２】また、前記マイクロカプセル内の油状液体
に分散する磁性粉に、永久磁石になり得るハードフェラ
イトに類する磁性粉を適量加えて、マイクロカプセルを
基板面に塗設後、永久磁石粉体として着磁した。[0012] Furthermore, an appropriate amount of magnetic powder similar to hard ferrite that can be made into a permanent magnet is added to the magnetic powder dispersed in the oily liquid in the microcapsule, and after coating the microcapsule on the substrate surface, the powder is used as a permanent magnet powder. It was magnetized.
【００１３】また、前記マイクロカプセル内の油状液体
中に分散する磁性粉の油状液体中の可動性を得るために
、その表面に親油処理を施した。[0013] Furthermore, in order to obtain mobility in the oily liquid of the magnetic powder dispersed in the oily liquid in the microcapsules, the surface thereof was subjected to lipophilic treatment.
【００１４】また、前記マイクロカプセル内の油状液体
中に光吸収性磁性粉と共に分散する光反射性非磁性粉は
平均粒径が０．０１ミクロンから数ミクロンの範囲にあ
り、油状液体中の分散及び可動性を得るためにその表面
に親油処理を施した。[0014] Furthermore, the light-reflecting non-magnetic powder dispersed together with the light-absorbing magnetic powder in the oily liquid in the microcapsules has an average particle size in the range of 0.01 microns to several microns, and the light-reflecting non-magnetic powder is dispersed in the oily liquid. And its surface was subjected to lipophilic treatment in order to obtain mobility.
【００１５】また、前記マイクロカプセル内の油状液体
中に分散する光吸収性磁性粉と光反射性非磁性粉の配合
比が１：８から１：１の範囲に含まれることとした。[0015] Furthermore, the blending ratio of the light-absorbing magnetic powder and the light-reflecting non-magnetic powder dispersed in the oily liquid in the microcapsules is within the range of 1:8 to 1:1.
【００１６】また、非磁性体基板に、油状液体中にそれ
ぞれ分散または溶解した光吸収性の優れた表面特性を有
する磁性粉と光反射性の優れた特性を有する非磁性粉を
封入したマイクロカプセル塗布層を施す構造を有するデ
ィスプレーと、そのディスプレーに塗布されているマイ
クロカプセル塗布層の全面に亘ってマイクロカプセル内
の光吸収性磁性粉をディスプレーの裏面側に吸引移動さ
せ、その結果として光反射性の非磁性粉をディスプレー
の表面側に移動させる手段として、及び前記によってデ
ィスプレーの裏面側に吸引移動した光吸収性磁性粉を局
部的に表面側に吸引移動させてその部分の光反射性非磁
性粉の位置を反転させることによって文字や像を形成さ
せる手段として永久磁石を用いた磁気装置よりなる磁気
ディスプレーシステムにおいて、非磁性体基板に塗布す
る油状液体中に分散した光吸収性磁性粉と光反射性非磁
性粉を封入したマイクロカプセルの塗布層に、そのマイ
クロカプセルの平均粒径よりはるかに微小粒径の、実質
的に透明な油状液体のみを封入した含油マイクロカプセ
ルを適量添加して塗布した。[0016] Furthermore, microcapsules are prepared in which a magnetic powder having an excellent light-absorbing surface property and a non-magnetic powder having an excellent light-reflecting property, each dispersed or dissolved in an oily liquid, are encapsulated in a non-magnetic substrate. The display has a structure in which a coating layer is applied, and the light-absorbing magnetic powder in the microcapsules is attracted and moved to the back side of the display over the entire surface of the microcapsule coating layer coated on the display, resulting in light reflection. As a means for moving the magnetic non-magnetic powder to the front side of the display, and by locally attracting and moving the light-absorbing magnetic powder that has been attracted and moved to the back side of the display to the front side, the light-reflecting non-magnetic powder of that part is moved. In a magnetic display system consisting of a magnetic device that uses permanent magnets as a means of forming characters or images by reversing the position of magnetic powder, light-absorbing magnetic powder and light-absorbing magnetic powder dispersed in an oily liquid applied to a non-magnetic substrate are used. By adding an appropriate amount of oil-containing microcapsules containing only a substantially transparent oily liquid, the particle size of which is much smaller than the average particle size of the microcapsules, to the coating layer of microcapsules containing light-reflecting non-magnetic powder. Coated.
【００１７】[0017]
【作用】光吸収性磁性粉と光反射性非磁性粉を分散した
油状液体を封入するマイクロカプセルの粒径分布を最適
化することにより、文字や画像縁辺部が尖鋭になる。[Operation] By optimizing the particle size distribution of microcapsules that enclose an oily liquid in which light-absorbing magnetic powder and light-reflecting non-magnetic powder are dispersed, the edges of characters and images become sharp.
【００１８】また、マイクロカプセル内の油状液体中に
分散する光吸収性磁性粉の表面積を増大する目的で微小
化し、さらに粒子径の異なる複数の光吸収性磁性粉を組
合わせることによって、文字や画像形成時の微小な光吸
収性磁性粉の凝集効果によって明暗コントラストが改善
される。In addition, the light-absorbing magnetic powder dispersed in the oily liquid inside the microcapsule is miniaturized for the purpose of increasing the surface area, and by combining a plurality of light-absorbing magnetic powders with different particle diameters, letters and Bright-dark contrast is improved by the aggregation effect of minute light-absorbing magnetic powder during image formation.
【００１９】また、マイクロカプセル内の油状液体中に
分散する光吸収性磁性粉に着磁した永久磁石となる磁性
粉を適量添加することにより、マイクロカプセル内での
光吸収性磁性粉の可動性と凝集性が強化され、文字，画
像の形成と消去の応答性と明暗コントラストが改善され
る。Furthermore, by adding an appropriate amount of magnetic powder that becomes a magnetized permanent magnet to the light-absorbing magnetic powder dispersed in the oily liquid in the microcapsule, the mobility of the light-absorbing magnetic powder in the microcapsule can be improved. The cohesiveness is strengthened, and the responsiveness and brightness contrast of character and image formation and erasure are improved.
【００２０】また、マイクロカプセル内の油状液体中に
分散する光吸収性磁性粉，光反射性非磁性粉の表面を潤
滑親油処理することにより、両者の位置転換時の可動性
が改善される。[0020] Furthermore, by applying a lubricating lipophilic treatment to the surfaces of the light-absorbing magnetic powder and the light-reflecting non-magnetic powder dispersed in the oily liquid in the microcapsules, the mobility of both during position change is improved. .
【００２１】また、マイクロカプセル内の油状液体中に
分散する光吸収性磁性粉と光反射性非磁性粉の配合比を
最適化して明暗のコントラストが改善される。[0021] Furthermore, the contrast between light and dark can be improved by optimizing the blending ratio of the light-absorbing magnetic powder and the light-reflecting non-magnetic powder dispersed in the oily liquid within the microcapsule.
【００２２】また、マイクロカプセル塗布層に、油状液
体のみを含有した微小粒径のマイクロカプセル適量を埋
設することによりマイクロカプセル塗布層の表面平滑性
が向上し、さらにそのマイクロカプセル中の油状液体の
光屈折率が利用され、光吸収性磁性粉の光吸収性と、光
反射性非磁性粉の光反射性が補強される。Furthermore, by embedding an appropriate amount of microcapsules containing only an oily liquid in the microcapsule coating layer, the surface smoothness of the microcapsule coating layer can be improved, and the oily liquid in the microcapsules can be further improved. The optical refractive index is used to enhance the light absorption properties of the light-absorbing magnetic powder and the light reflection properties of the light-reflecting non-magnetic powder.
【００２３】[0023]
【実施例】以下、本発明を図面に示す実施例に基づいて
詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below based on embodiments shown in the drawings.
【００２４】同図において、１はディスプレーで、この
ディスプレー１は非磁性体基板２の裏面全面に、光吸収
性磁性粉３と光反射性非磁性粉４を含有したマイクロカ
プセル５を、更に磁性粉も非磁性粉も含まない微小粒径
の含油マイクロカプセル６を塗布してマイクロカプセル
層７を設け、更に、マイクロカプセル３と含油マイクロ
カプセル６が摩擦圧によって裂壊することを防止するた
めの保護層８を設ける構造とした。In the figure, 1 is a display, and this display 1 includes microcapsules 5 containing light-absorbing magnetic powder 3 and light-reflecting non-magnetic powder 4 on the entire back surface of a non-magnetic substrate 2, and further magnetic A microcapsule layer 7 is provided by coating oil-impregnated microcapsules 6 with a minute particle size that does not contain powder or non-magnetic powder, and further, a method for preventing the microcapsules 3 and oil-impregnated microcapsules 6 from being torn apart by frictional pressure. A structure in which a protective layer 8 is provided is adopted.
【００２５】前記非磁性体基板２としては、マイクロカ
プセル塗布層７を充分保持できる強度を有するプラスチ
ック，グラスファイバー，ガラス，紙，その他の硬質シ
ート状或いは軟質可撓性フイルム状のものが使用される
。The non-magnetic substrate 2 may be made of plastic, glass fiber, glass, paper, or other hard sheet or soft flexible film having sufficient strength to hold the microcapsule coating layer 7. Ru.
【００２６】次に光吸収性磁性粉３と光反射性磁性粉４
を含有したマイクロカプセル５及び含油マイクロカプセ
ル６によるマイクロカプセル層７について説明する。Next, light-absorbing magnetic powder 3 and light-reflecting magnetic powder 4
The microcapsule layer 7 made of the microcapsules 5 containing the oil-containing microcapsules 6 and the oil-containing microcapsules 6 will be explained.
【００２７】そもそも、本発明の磁気ディスプレーで重
要な特徴は磁場を与えることによってマイクロカプセル
５中で光吸収性磁性粉３が移動し、その結果として光反
射性非磁性粉４が受動的にその位置を変えることにある
ので、ディスプレー１の画質の良否は光吸収性磁性粉３
の光吸収と光反射性非磁性粉４の光反射によって生じる
明暗のコントラストの強弱と、そのコントラストによっ
て生じる文字や画像の縁辺部の尖鋭度と、更には光吸収
性磁性粉３と光反射性非磁性粉４の位置転換が短時間に
行われ、しかもその位置転換によって生じた文字や画像
が長期間安定維持できるかどうかによってきまる。上記
したディスプレー画質の良質化は、次に例示するような
二律背反する因子の最適組合せによって達成される。To begin with, the important feature of the magnetic display of the present invention is that the light-absorbing magnetic powder 3 moves within the microcapsules 5 by applying a magnetic field, and as a result, the light-reflecting non-magnetic powder 4 passively moves within the microcapsules 5. Since the image quality of the display 1 depends on changing the position, the quality of the image on the display 1 depends on the light absorbing magnetic powder 3.
The strength of the contrast between light and dark caused by the light reflection of the non-magnetic powder 4, the sharpness of the edges of characters and images caused by the contrast, and the light-absorbing magnetic powder 3 and the light reflectivity. It depends on whether the position of the non-magnetic powder 4 can be changed in a short time and whether the characters and images generated by the position change can be maintained stably for a long period of time. The improvement in display image quality described above is achieved by an optimal combination of contradictory factors as exemplified below.
【００２８】[0028]
【表１】[Table 1]
【００２９】本発明では上記した各因子の組合せを最適
化するために複数粒径のマイクロカプセル５，複数粒径
の光吸収性磁性粉３，光反射性非磁性粉４を組合わせ、
光吸収性磁性粉３と光反射性非磁性粉４の配合比を調整
し、また光吸収性磁性粉３と光反射性非磁性粉４に潤滑
処理を施し、また光吸収性磁性粉３に永久磁石粉体９を
添加し、さらにマイクロカプセル塗布層７に光吸収性磁
性粉３，光反射性非磁性粉４を含まない含油カプセル６
を適宜配列した。In the present invention, in order to optimize the combination of the above-mentioned factors, microcapsules 5 of multiple particle sizes, light-absorbing magnetic powder 3 of multiple particle sizes, and light-reflecting non-magnetic powder 4 are combined,
The blending ratio of the light-absorbing magnetic powder 3 and the light-reflecting non-magnetic powder 4 was adjusted, and the light-absorbing magnetic powder 3 and the light-reflecting non-magnetic powder 4 were lubricated, and the light-absorbing magnetic powder 3 was Oil-impregnated capsules 6 to which permanent magnetic powder 9 is added and which do not contain light-absorbing magnetic powder 3 and light-reflecting non-magnetic powder 4 in microcapsule coating layer 7
were arranged appropriately.
【００３０】先ず、光吸収性磁性粉３と光反射性非磁性
粉４を含有したマイクロカプセル５について、本実施例
では光吸収性磁性粉３として、表面にシリコン処理を施
した二酸化マンガンを１０％含む四三酸化鉄の粉体粒子
の粒径０．５ミクロンのものと、粒径０．３ミクロンの
ものを３：１の比率で混合して用いた。また、光反射性
非磁性粉４として、表面に親油処理を施した、平均粒径
０．３ミクロンの白色酸化チタン粉体を用いた。上記光
吸収性磁性粉３と光反射性非磁性粉４をフタル酸ジブチ
ル中に重量比でそれぞれ０．４％と１４％の割合で分散
した。First, regarding the microcapsules 5 containing the light-absorbing magnetic powder 3 and the light-reflecting non-magnetic powder 4, in this example, as the light-absorbing magnetic powder 3, 10% of manganese dioxide whose surface was silicon-treated was used. % triiron tetroxide powder particles having a particle size of 0.5 microns and particles having a particle size of 0.3 microns were mixed at a ratio of 3:1. Further, as the light-reflective non-magnetic powder 4, white titanium oxide powder with an average particle size of 0.3 microns and whose surface was subjected to lipophilic treatment was used. The light-absorbing magnetic powder 3 and the light-reflecting non-magnetic powder 4 were dispersed in dibutyl phthalate at weight ratios of 0.4% and 14%, respectively.
【００３１】次にｐＨ６に調整したゼラチン濃度１１％
の水溶液にアラビアゴム１１％の水溶液を加えてマイク
ロカプセル重合体膜用の水溶液系をつくり、約５０℃に
昇温して系のｐＨを４に調整したのち、あらかじめ準備
した前記光吸収性磁性粉３と光反射性非磁性粉４の分散
液を加えて分散液滴が約４００ミクロンになるように攪
拌した。所望の分散液滴が得られたのち、ゼラチンの４
倍量の水を加え系の温度を除冷後さらに１０℃まで冷却
して分散液滴の界面上に析出したゼラチン／アラビアゴ
ムの重合体膜をゲル化してグルタールアルデヒド２５％
濃度の水溶液を加えて重合体膜を硬化してマイクロカプ
セル５Ａを得た。同様の操作により約２００ミクロン粒
径のマイクロカプセル５Ｂを作成した。Next, gelatin concentration of 11% was adjusted to pH 6.
An aqueous solution system for a microcapsule polymer film was prepared by adding an aqueous solution of 11% gum arabic to an aqueous solution of the above, and the temperature was raised to about 50°C and the pH of the system was adjusted to 4. A dispersion of powder 3 and light reflective non-magnetic powder 4 was added and stirred so that the dispersed droplets were about 400 microns. After obtaining the desired dispersed droplets, 4
After adding twice the amount of water and slowly cooling the system, the system was further cooled to 10°C to gelatinize the gelatin/gum arabic polymer film that precipitated on the interface of the dispersed droplets, resulting in glutaraldehyde containing 25% glutaraldehyde.
The polymer film was cured by adding a concentrated aqueous solution to obtain microcapsules 5A. Microcapsules 5B having a particle size of about 200 microns were prepared by the same operation.
【００３２】次に、含油マイクロカプセル６について述
べる。まず、濃度がそれぞれ１１％のｐＨ６に調整した
ゼラチン水溶液とアラビアゴム水溶液を準備した。その
ゼラチン水溶液中に、そのほぼ８０％相当重量のフタル
酸ジブチルを加えて攪拌し４０ミクロンの油滴が得られ
るＯ／Ｗ型の乳化液をつくり、その乳化液にゼラチン水
溶液と等量のアラビアゴム水溶液を加えて５０℃まで昇
温したのち、系のｐＨを４．５に下げてゼラチン水溶液
の４倍量の水を加え系を１０℃まで冷却して、濃度２５
％のグルタールアルデヒド水溶液を加えてゼラチン重合
膜を硬化して、微小な含油カプセル６を得た。Next, the oil-containing microcapsule 6 will be described. First, a gelatin aqueous solution and a gum arabic aqueous solution each having a concentration of 11% and adjusted to pH 6 were prepared. Dibutyl phthalate in an amount equivalent to approximately 80% of the gelatin aqueous solution is added and stirred to create an O/W type emulsion that produces oil droplets of 40 microns. After adding the rubber aqueous solution and raising the temperature to 50°C, the pH of the system was lowered to 4.5, and 4 times the amount of water as the gelatin aqueous solution was added, the system was cooled to 10°C, and the concentration was 25°C.
% of glutaraldehyde aqueous solution was added to harden the gelatin polymer film to obtain minute oil-containing capsules 6.
【００３３】上記の方法で得られたマイクロカプセル５
Ａ，５Ｂ及び含油マイクロカプセル６は、それぞれマイ
クロカプセル分を約２０％含むスラリーとして得られる
。それぞれのスラリーを１０：５：３の割合で配合して
水分を１／２に減らし、ポリビニルアルコール１０％の
水溶液を同量加えてマイクロカプセル５Ａ，５Ｂと含油
マイクロカプセル６の混合塗布液を得た。この塗布液を
下地処理した１００ミクロンの厚さのポリエチレンテレ
フタレートシートでなる非磁性体基板２の裏面にブレー
ド付きカーテンコーターによって約５００ミクロンのウ
エット厚みに塗布して温風によって塗布層を乾燥してデ
ィスプレー１のシートを得た。Microcapsules 5 obtained by the above method
A, 5B and oil-impregnated microcapsules 6 are each obtained as a slurry containing about 20% of the microcapsule content. The respective slurries were mixed in a ratio of 10:5:3 to reduce the water content to 1/2, and the same amount of 10% polyvinyl alcohol aqueous solution was added to obtain a mixed coating solution of microcapsules 5A and 5B and oil-containing microcapsules 6. Ta. This coating solution was applied to the back surface of a non-magnetic substrate 2 made of a 100 micron thick polyethylene terephthalate sheet with a base treatment to a wet thickness of about 500 microns using a curtain coater with a blade, and the coating layer was dried with hot air. A display 1 sheet was obtained.
【００３４】次に他の実施例を説明する。光吸収性磁性
粉３として、シリコン表面処理を施した二酸化マンガン
１０％を含む四三酸化鉄粉体粒径０．５ミクロンと、同
０．３ミクロンに加えて永久磁石粉体９となり得るシリ
コン表面処理を施した粒径１．０ミクロンの異方性サマ
リウムコバルト磁性粉（組成；Ｓｍ２５．５％，Ｃｏ５
０％，Ｃｕ８％，Ｆｅ１５％，Ｚｒ１．４％）の３成分
をそれぞれ重量比で６０％，３０％，１０％の割合で混
合して用いた。また光反射性磁性粉４として、表面に親
油処理を施した平均粒径０．３ミクロンの白色酸化チタ
ン微粉を用い、前記混合磁性粉とともにフタル酸ジブチ
ル中にそれぞれ重量比で０．５％，１４％の割合で分散
した。Next, another embodiment will be explained. As the light-absorbing magnetic powder 3, triiron tetroxide powder particle size 0.5 micron containing 10% manganese dioxide and subjected to silicon surface treatment, and in addition to the same 0.3 micron, silicon that can be used as permanent magnet powder 9 Surface-treated anisotropic samarium cobalt magnetic powder with a particle size of 1.0 microns (composition: Sm25.5%, Co5
0%, Cu 8%, Fe 15%, and Zr 1.4%) were mixed at weight ratios of 60%, 30%, and 10%, respectively. Further, as the light-reflecting magnetic powder 4, white titanium oxide fine powder with an average particle size of 0.3 microns, whose surface has been subjected to lipophilic treatment, is used, and together with the mixed magnetic powder, 0.5% by weight of each is added to dibutyl phthalate. , distributed at a rate of 14%.
【００３５】この分散系を前記実施例と同様の方法で、
２種類の平均粒径となるマイクロカプセル５Ａ，５Ｂを
得て、前記実施例と同様の方法で得た粒径４０ミクロン
の含油マイクロカプセル６と、それぞれ１０：５：３の
割合で配合したマイクロカプセル５Ａ，５Ｂ，含油マイ
クロカプセル６の混合塗布液を下地処理した１００ミク
ロンの厚さのポリエチレンテレフタレートシートの裏面
に塗布乾燥した後、前記マイクロカプセル５に磁性粉の
一成分として含有した磁性粉に着磁して永久磁石粉体９
とした。このようにして得たディスプレー１のシートは
前記実施例によるディスプレーと比較して、書き込み、
消去の即時性と画像の鮮明度において優れていた。[0035] This dispersion system was prepared in the same manner as in the above example.
Microcapsules 5A and 5B having two types of average particle sizes were obtained, and microcapsules were mixed in a ratio of 10:5:3 with oil-impregnated microcapsules 6 having a particle size of 40 microns obtained in the same manner as in the above example. After coating a mixed coating solution of capsules 5A, 5B and oil-containing microcapsules 6 on the back surface of a 100 micron thick polyethylene terephthalate sheet that has been subjected to surface treatment and drying, the magnetic powder contained in the microcapsules 5 as one component of the magnetic powder is coated. Magnetized permanent magnet powder 9
And so. The sheet of display 1 obtained in this way was compared with the display according to the previous example, and the sheet of display 1 was
It was excellent in erasing immediacy and image clarity.
【００３６】図２は、前記したマイクロカプセル５及び
含油マイクロカプセル６を非磁性体基板２の裏面に塗布
してマイクロカプセル層７を設けたディスプレー１に、
マイクロカプセル５内の光吸収性磁性粉３及び永久磁石
粉体９をディスプレー１の全面に亘って、その裏面側に
吸引移動させる磁気装置１０を支持体１１に装着した図
である。この磁気装置１０は帯状に長い永久磁石１２が
用いられており、この磁気装置１０をスライダーとして
、ディスプレー１の面の裏面の一端より他端にスライド
移動させることによって、マイクロカプセル５内の光吸
収性磁性粉３及び永久磁石粉体９をディスプレー１の面
の裏面に吸引移動させることができるものである。FIG. 2 shows a display 1 in which a microcapsule layer 7 is provided by coating the above-described microcapsules 5 and oil-containing microcapsules 6 on the back surface of a non-magnetic substrate 2.
2 is a diagram in which a magnetic device 10 is attached to a support 11 to attract and move the light-absorbing magnetic powder 3 and the permanent magnet powder 9 in the microcapsule 5 to the back side of the display 1 over the entire surface of the display 1. FIG. This magnetic device 10 uses a long strip-shaped permanent magnet 12, and by sliding this magnetic device 10 as a slider from one end of the back surface of the display 1 to the other end, light absorption inside the microcapsules 5 is achieved. The magnetic powder 3 and the permanent magnet powder 9 can be attracted and moved to the back surface of the display 1.
【００３７】図４は、ディスプレー１の面の裏面の一端
より他端の方向に磁気装置１０を移動したとき、マイク
ロカプセル５内の光吸収性磁性粉３及び永久磁石粉体９
が磁気装置１０に吸引されて下部に、そして光反射性非
磁性粉４が上部に移動する状態を示すものである。FIG. 4 shows that when the magnetic device 10 is moved from one end of the back surface of the display 1 to the other end, the light-absorbing magnetic powder 3 and the permanent magnet powder 9 inside the microcapsule 5 are
The figure shows a state in which the powder is attracted by the magnetic device 10 and moves to the bottom, and the light-reflective non-magnetic powder 4 moves to the top.
【００３８】図５は図４に示すマイクロカプセル５の拡
大図である。このように、マイクロカプセル５内の光吸
収性磁性粉３が下部に、また光反射性非磁性粉４が上部
に移動した状態にあるディスプレー１を表面からみると
、入射光を光反射性非磁性粉４が反射することによって
ディスプレー１の全面が白色を示す。FIG. 5 is an enlarged view of the microcapsule 5 shown in FIG. In this way, when viewing the display 1 from the surface with the light-absorbing magnetic powder 3 in the microcapsules 5 moving to the bottom and the light-reflecting non-magnetic powder 4 moving to the top, the incident light is reflected by the light-reflecting non-magnetic powder. The entire surface of the display 1 appears white due to the reflection of the magnetic powder 4.
【００３９】図６は、文字，画像を示すディスプレー１
の面に文字，画像を形成するための磁気装置１２を示す
ものであり、ホルダー１３に２極着磁した棒状永久磁石
１４を装着した構成となっている。FIG. 6 shows a display 1 showing characters and images.
This figure shows a magnetic device 12 for forming characters and images on the surface of a holder 13, in which a bar-shaped permanent magnet 14 magnetized with two poles is attached to a holder 13.
【００４０】図７は、全面が白色に反射しているディス
プレー１の非磁性体基板２の表面から、前記ホルダー１
３に装着した２極着磁の棒状永久磁石１４の先端を接触
移動させて文字やその他の像を描くことにより、その部
分のマイクロカプセル５の内部の光吸収性磁性粉３は上
部に、また光反射性非磁性粉４が下部に移動する状態を
示すものである。FIG. 7 shows how the holder 1 is viewed from the surface of the non-magnetic substrate 2 of the display 1 whose entire surface reflects white.
By touching and moving the tip of the bipolar magnetized bar-shaped permanent magnet 14 attached to the microcapsule 3 to draw characters or other images, the light-absorbing magnetic powder 3 inside the microcapsule 5 in that part is moved to the upper part, and This shows a state in which the light-reflective non-magnetic powder 4 moves to the bottom.
【００４１】図８は図７に示すマイクロカプセル５に光
が当ったときの光の反射と吸収を示す拡大図である。FIG. 8 is an enlarged view showing reflection and absorption of light when the microcapsules 5 shown in FIG. 7 are irradiated with light.
【００４２】このようにマイクロカプセル５Ａ，５Ｂ内
の光吸収性磁性粉３が上部に移動した部分をディスプレ
ー１の表面からみると、入射光は光吸収性磁性粉３によ
って吸収されて黒色を示す。即ち、図４に示す操作によ
り、ディスプレー１の表面に光反射性非磁性粉４による
白色反射を与えたのち、その同じ表面を図６に示す操作
によって部分的に光吸収性磁性粉３による黒色吸収色に
転換させることによって文字や像を表示することができ
る。When the part where the light-absorbing magnetic powder 3 in the microcapsules 5A and 5B has moved upward is viewed from the surface of the display 1, the incident light is absorbed by the light-absorbing magnetic powder 3 and a black color is displayed. . That is, by the operation shown in FIG. 4, the surface of the display 1 is given white reflection by the light-reflecting non-magnetic powder 4, and then the same surface is partially colored black by the light-absorbing magnetic powder 3 by the operation shown in FIG. Characters and images can be displayed by converting to absorption color.
【００４３】上記のように、本発明では、先ず二律背反
する因子の組合せを最適化することにより、ディスプレ
ー画質の良質化を図っている。即ち、ディスプレーの画
像の光吸収性磁性粉３と光反射性非磁性粉４の相対的な
位置によって生じる明暗のコントラストトを強化するた
めには、マイクロカプセル５の粒径を出来るだけ大きく
して光吸収性磁性粉３がマイクロカプセル５の底部に位
置しているときにその上部に位置する光反射性非磁性粉
４の層を厚くし、逆に光反射性非磁性粉４がマイクロカ
プセル５の底部にあるときはその上部にある光吸収性磁
性粉３の層を厚くして、相互に底部にある粉体カラーに
対する隠蔽力を強くすべきであるが、この場合画像が粗
くなり、複雑な字画や細い画像の縁辺部が不鮮明となる
。As described above, the present invention attempts to improve the display image quality by first optimizing the combination of contradictory factors. That is, in order to enhance the contrast between brightness and darkness caused by the relative positions of the light-absorbing magnetic powder 3 and the light-reflecting non-magnetic powder 4 in the display image, the particle size of the microcapsules 5 should be made as large as possible. When the light-absorbing magnetic powder 3 is located at the bottom of the microcapsule 5, the layer of light-reflecting non-magnetic powder 4 located above is made thicker, and conversely, the light-reflecting non-magnetic powder 4 is located at the bottom of the microcapsule 5. When the light-absorbing magnetic powder 3 is at the bottom of the layer, the layer of light-absorbing magnetic powder 3 on top should be thicker to strengthen the mutual hiding power for the powder colors at the bottom, but in this case, the image will be rough and complicated. The edges of sharp strokes and thin images become unclear.
【００４４】逆にマイクロカプセル５の粒径を小さくす
ると画像が密となり画像縁辺部が尖鋭となるが、光吸収
性磁性粉３，光反射性非磁性粉４の層が薄くなり、相互
の隠蔽力が不足して明暗のコントラストが弱くなる。本
発明では上記の相反する２つの因子を両立させる目的で
２種の粒径の光吸収性磁性粉３，光反射性非磁性粉４含
有のマイクロカプセル５Ａ，５Ｂ及び微小粒径の含油マ
イクロカプセル６を配合して、ディスプレーのマイクロ
カプセル塗布層７とした。On the other hand, if the particle size of the microcapsules 5 is made smaller, the image becomes denser and the edges of the image become sharper, but the layers of the light-absorbing magnetic powder 3 and the light-reflecting non-magnetic powder 4 become thinner, and their mutual concealment becomes more difficult. The contrast between light and dark becomes weak due to lack of power. In the present invention, in order to balance the above two contradictory factors, microcapsules 5A and 5B containing light-absorbing magnetic powder 3 and light-reflecting non-magnetic powder 4 of two types of particle sizes and oil-impregnated microcapsules of fine particle size are provided. 6 was blended to form the microcapsule coating layer 7 of the display.
【００４５】上記の配合マイクロカプセル５Ａ，５Ｂの
うち、小粒径のマイクロカプセル５Ｂの隠蔽力の不足を
補うため微小粒径の含油マイクロカプセル６を、光吸収
性磁性粉３，光反射性非磁性粉４の双方を含有するマイ
クロカプセル５Ａ，５Ｂに添加配合している。この微小
な含油カプセル６が存在することにより、ディスプレー
１の面にマイクロカプセル５Ａ，５Ｂ内の光吸収性磁性
粉３によって形成された画像があるとき、そのマイクロ
カプセル５Ａ，５Ｂの上面または隣接部にある含油マイ
クロカプセル６を透過してその画像の線面に入射した光
は、含油マイクロカプセル６内のフタル酸ジブチルの屈
折率１．４９と光吸収性磁性粉３の屈折率１．６５の差
が小さいことから光吸収性磁性粉３の層に透過吸収され
、一方、画像線面以外の部分に入射した光は、含油マイ
クロカプセル６内のフタル酸ジブチルの屈折率と二酸化
チタンの屈折率２．７１の差が大きいことから二酸化チ
タン層による反射が強化される。これにより、小粒径の
マイクロカプセル５Ｂによる像形成時の明暗コントラス
トの不足分を補う効果が得られる。Of the above compounded microcapsules 5A and 5B, in order to compensate for the lack of hiding power of the small-sized microcapsules 5B, the small-sized oil-impregnated microcapsules 6 were mixed with light-absorbing magnetic powder 3 and light-reflecting non-containing powder. It is added and blended into microcapsules 5A and 5B containing both magnetic powder 4. Due to the presence of these minute oil-containing capsules 6, when there is an image formed by the light-absorbing magnetic powder 3 in the microcapsules 5A, 5B on the surface of the display 1, the upper surface or adjacent portion of the microcapsules 5A, 5B The light that has passed through the oil-containing microcapsules 6 and entered the line plane of the image has a refractive index of 1.49 of dibutyl phthalate in the oil-containing microcapsules 6 and a refractive index of 1.65 of the light-absorbing magnetic powder 3. Since the difference is small, the light is transmitted and absorbed by the layer of light-absorbing magnetic powder 3, and on the other hand, the light incident on the area other than the image line plane is affected by the refractive index of dibutyl phthalate and the refractive index of titanium dioxide in the oil-containing microcapsules 6. Since the difference of 2.71 is large, the reflection by the titanium dioxide layer is enhanced. This provides the effect of compensating for the lack of brightness and darkness contrast during image formation due to the small particle diameter microcapsules 5B.
【００４６】また、マイクロカプセル５Ａ，５Ｂ内の油
状液体中に分散する光吸収性磁性粉３の粒径を微小化し
て、２種類の粒径とすることによって、文字，画像形成
部に濃密な凝集吸着が得られ、また微小化によって増大
した表面積を利用できることから光吸収性磁性粉３の二
酸化チタンに対する配合比を小さくして、文字，画像形
成部以外の部分、即ち光吸収性磁性粉３がマイクロカプ
セル５Ａ，５Ｂの底部に位置しているときその上部に位
置する二酸化チタン層の部分、を厚くして光反射性が増
大する結果、ディスプレーの明暗コントラストが改善さ
れる。Furthermore, by miniaturizing the particle size of the light-absorbing magnetic powder 3 dispersed in the oily liquid in the microcapsules 5A and 5B to provide two types of particle sizes, dense opacity can be applied to the character and image forming areas. Since cohesive adsorption can be obtained and the increased surface area due to miniaturization can be utilized, the blending ratio of the light-absorbing magnetic powder 3 to titanium dioxide is reduced, and the light-absorbing magnetic powder 3 is applied to areas other than text and image forming areas. When the titanium dioxide layer is located at the bottom of the microcapsules 5A, 5B, the portion of the titanium dioxide layer located on top thereof is thickened to increase the light reflectivity, and as a result, the brightness contrast of the display is improved.
【００４７】そして、光吸収性磁性粉３に２種類の微小
化粒径を用いて、磁場を与えたときに比較的大きな粒径
の粒子の周囲に比較的小さな粒子が凝集して、マイクロ
カプセル５Ａ，５Ｂ内で位置転換するための良好な可動
性と、文字，画像を形成するマイクロカプセル５Ａ，５
Ｂの光吸収性磁性粉３粒子の凝集密度を濃厚にし、更に
、マイクロカプセル５Ａ，５Ｂ内の油状液体中に分散す
る光吸収性磁性粉３に永久磁石粉体９を少量加えること
により、前記可動性が一層良好になり、そして前記凝集
密度も一層濃密になる。[0047] Then, by using two types of miniaturized particle sizes for the light-absorbing magnetic powder 3, when a magnetic field is applied, relatively small particles aggregate around particles with a relatively large particle size, forming microcapsules. Microcapsules 5A, 5 with good mobility for repositioning within 5A, 5B and forming characters and images
By increasing the agglomeration density of the light-absorbing magnetic powder 3 particles B and further adding a small amount of permanent magnet powder 9 to the light-absorbing magnetic powder 3 dispersed in the oily liquid in the microcapsules 5A and 5B, The mobility is better and the agglomerate density is also denser.
【００４８】[0048]
【発明の効果】以上のように本発明によれば、先ず、マ
イクロカプセルの粒径の大小，光吸収性磁性粉及び光反
射性非磁性粉の粒径の大小に起因する、ディスプレーの
画質を良質化するための二律背反する因子の組合せを最
適化したものであり、光吸収性磁性粉と光反射性非磁性
粉を分散した油状液体を封入するマイクロカプセルの粒
径分布を最適化することにより、文字や画像縁辺部を尖
鋭にすることができ、そして、マイクロカプセル内の油
状液体中に分散する光吸収性磁性粉の表面積を増大する
目的で微小化し、さらに粒子径の異なる複数の光吸収性
磁性粉を組合せることにより、文字や画像形成時の微小
磁性粉の凝集によって明暗コントラストの向上を図るこ
とができる。As described above, according to the present invention, the image quality of a display, which is caused by the particle size of microcapsules, the light-absorbing magnetic powder, and the light-reflecting non-magnetic powder, can be improved. This is an optimized combination of contradictory factors to improve quality, and by optimizing the particle size distribution of microcapsules that enclose an oily liquid in which light-absorbing magnetic powder and light-reflecting non-magnetic powder are dispersed. , the edges of characters and images can be sharpened, and the surface area of the light-absorbing magnetic powder dispersed in the oily liquid inside the microcapsules can be increased. By combining magnetic powders, it is possible to improve the contrast between brightness and darkness by agglomerating the fine magnetic powders when forming characters or images.
【００４９】また、マイクロカプセル内の油状液体中に
分散する光吸収性磁性粉に永久磁石粉体を適量添加する
ことにより、マイクロカプセル内での磁性粉の可動性と
凝集性が強化され、文字や画像の形成と消去の応答性と
明暗コントラストの向上を図ることができる。Furthermore, by adding an appropriate amount of permanent magnetic powder to the light-absorbing magnetic powder dispersed in the oily liquid in the microcapsule, the mobility and cohesiveness of the magnetic powder in the microcapsule are strengthened, and the character It is possible to improve the responsiveness of forming and erasing images and the contrast between brightness and darkness.
【００５０】また、マイクロカプセル内の油状液体中に
分散する光吸収性磁性粉及び光反射性非磁性粉の表面を
潤滑親油処理することにより、両者の位置転換時の可動
性の向上を図ることができる。[0050] In addition, the surfaces of the light-absorbing magnetic powder and the light-reflecting non-magnetic powder dispersed in the oily liquid in the microcapsules are subjected to lubricant lipophilic treatment to improve their mobility when changing their positions. be able to.
【００５１】また、マイクロカプセル内の油状液体中に
分散する光吸収性磁性粉と光反射性非磁性粉の配合比を
最適化することにより、明暗のコントラストの向上を図
ることができる。Furthermore, by optimizing the blending ratio of the light-absorbing magnetic powder and the light-reflecting non-magnetic powder dispersed in the oily liquid in the microcapsules, it is possible to improve the contrast between light and dark.
【００５２】更には、マイクロカプセル塗布層に、油状
液体のみを含有した微小粒径の含油マイクロカプセルを
適量埋設することにより、この含油マイクロカプセル中
の油状液体の光屈折率の作用によって、マイクロカプセ
ルのうち、小粒径のマイクロカプセルの光吸収性磁性粉
の光吸収性と、光反射性非磁性粉の光反射性を補強する
ことにより、小粒径マイクロカプセルによる像形成時の
明暗コントラストの不足分を補うことができる。Furthermore, by embedding an appropriate amount of oil-impregnated microcapsules containing only an oily liquid in the microcapsule coating layer, the microcapsules can be formed by the action of the optical refractive index of the oily liquid in the oil-impregnated microcapsules. Among them, by reinforcing the light absorption of the light-absorbing magnetic powder and the light reflection of the light-reflecting non-magnetic powder of the small-sized microcapsules, the light-dark contrast during image formation using the small-sized microcapsules can be improved. You can make up for the shortfall.
【図１】本発明のディスプレーの構造例を示す説明図で
ある。FIG. 1 is an explanatory diagram showing an example of the structure of a display according to the present invention.
【図２】ディスプレー全面に亘ってマイクロカプセル内
の光吸収性磁性粉をマイクロカプセルの下部、即ちディ
スプレー面の裏面に吸引移動させる磁気装置を装着した
状態を示す説明図である。FIG. 2 is an explanatory diagram showing a state in which a magnetic device is attached that attracts and moves the light-absorbing magnetic powder in the microcapsules to the lower part of the microcapsules, that is, to the back surface of the display surface over the entire surface of the display.
【図３】図２に示す磁気装置の説明図である。FIG. 3 is an explanatory diagram of the magnetic device shown in FIG. 2;
【図４】ディスプレー全面に亘ってマイクロカプセル内
の光吸収性磁性粉がマイクロカプセルの下部、即ちディ
スプレーの裏面に吸引され移動した状態を示す説明図で
ある。FIG. 4 is an explanatory diagram showing a state in which the light-absorbing magnetic powder inside the microcapsule is attracted to the lower part of the microcapsule, that is, the back surface of the display and moves over the entire surface of the display.
【図５】図４に示すマイクロカプセルの拡大説明図であ
る。FIG. 5 is an enlarged explanatory diagram of the microcapsule shown in FIG. 4.
【図６】ディスプレー面に文字，画像を形成するための
磁気装置を示す説明図である。FIG. 6 is an explanatory diagram showing a magnetic device for forming characters and images on a display surface.
【図７】ディスプレー面に文字，画像を形成するときの
、マイクロカプセル内の光吸収性磁性粉と光反射性非磁
性粉の位置逆転を示す説明図である。FIG. 7 is an explanatory diagram showing the reversal of the positions of the light-absorbing magnetic powder and the light-reflecting non-magnetic powder in the microcapsule when forming characters and images on the display surface.
【図８】図７に示すマイクロカプセルに光が当ったとき
の光の吸収と反射を示す拡大説明図である。8 is an enlarged explanatory diagram showing absorption and reflection of light when light hits the microcapsule shown in FIG. 7; FIG.
１ ディスプレー ２ 非磁性体基板 ３ 光吸収性磁性体 ４ 光反射性非磁性体 ５ マイクロカプセル ５Ａ 大粒径のマイクロカプセル ５Ｂ 小粒径のマイクロカプセル ６ 含油マイクロカプセル ７ マイクロカプセル塗布層 ９ 永久磁石粉体 1 Display 2 Non-magnetic substrate 3. Light-absorbing magnetic material 4. Light reflective non-magnetic material 5. Microcapsules 5A Large particle size microcapsule 5B Small particle size microcapsules 6 Oil-containing microcapsules 7 Microcapsule coating layer 9 Permanent magnet powder
Claims (7)
れ分散または溶解した光吸収性の優れた表面特性を有す
る磁性粉と光反射性の優れた特性を有する非磁性粉を封
入したマイクロカプセル塗布層を施す構造を有するディ
スプレーと、そのディスプレーに塗布されているマイク
ロカプセル塗布層の全面に亘ってマイクロカプセル内の
光吸収性磁性粉をディスプレーの裏面側に吸引移動させ
、その結果として光反射性の非磁性粉をディスプレーの
表面側に移動させる手段として、及び前記によってディ
スプレーの裏面側に吸引移動した光吸収性磁性粉を局部
的に表面側に吸引移動させてその部分の光反射性非磁性
粉の位置を反転させることによって文字や像を形成させ
る手段として永久磁石を用いた磁気装置よりなる磁気デ
ィスプレーシステムにおいて、光吸収性磁性粉と、光反
射性非磁性粉が分散される油状液体を封入するマイクロ
カプセルは、その壁膜が実質的に透明で、内容物を半永
久的に保持できる強度を有する重合体膜で形成し、その
最大粒径１，０００ミクロン、最小粒径１００ミクロン
の範囲にある複数粒径のマイクロカプセルを適宜の比率
で配合したことを特徴とする磁気ディスプレーシステム
。1. Microcapsules in which a non-magnetic substrate is encapsulated with magnetic powder having an excellent light-absorbing surface property and non-magnetic powder having an excellent light-reflecting property, each dispersed or dissolved in an oily liquid. The display has a structure in which a coating layer is applied, and the light-absorbing magnetic powder in the microcapsules is attracted and moved to the back side of the display over the entire surface of the microcapsule coating layer coated on the display, resulting in light reflection. As a means for moving the magnetic non-magnetic powder to the front side of the display, and by locally attracting and moving the light-absorbing magnetic powder that has been attracted and moved to the back side of the display to the front side, the light-reflecting non-magnetic powder of that part is moved. In a magnetic display system consisting of a magnetic device using permanent magnets as a means of forming characters or images by reversing the position of magnetic powder, an oily liquid in which light-absorbing magnetic powder and light-reflecting non-magnetic powder are dispersed. The microcapsules that encapsulate are made of a polymer film with a substantially transparent wall and strong enough to retain the contents semi-permanently, and have a maximum particle size of 1,000 microns and a minimum particle size of 100 microns. A magnetic display system characterized by blending microcapsules with multiple particle sizes within a range at an appropriate ratio.
する磁性粉は最小粒径０．２ミクロン、最大粒径数ミク
ロンの範囲の一種または数種の粒径を組合せて用いたこ
とを特徴とする請求項１記載の磁気ディスプレーシステ
ム。[Claim 2] The magnetic powder dispersed in the oily liquid within the microcapsules is characterized in that one or more types of particle sizes are used in combination, ranging from a minimum particle size of 0.2 microns to a maximum particle size of several microns. The magnetic display system according to claim 1.
する磁性粉に、永久磁石になり得るハードフェライトに
類する磁性粉を適量加えて、マイクロカプセルを基板面
に塗設後、永久磁石として着磁することができるハード
フェライトに類する磁性粉を光吸収性磁性粉の１成分と
することを特徴とする請求項１記載の磁気ディスプレー
システム。[Claim 3] Add an appropriate amount of magnetic powder similar to hard ferrite that can become a permanent magnet to the magnetic powder dispersed in the oily liquid inside the microcapsule, apply the microcapsule to the substrate surface, and then magnetize it as a permanent magnet. 2. The magnetic display system according to claim 1, wherein one component of the light-absorbing magnetic powder is a magnetic powder similar to hard ferrite that can absorb light.
散する磁性粉の油状液体中の可動性を得るために、その
表面に親油処理を施したことを特徴とする請求項１記載
の磁気ディスプレーシステム。4. The magnetic display according to claim 1, wherein the surface of the magnetic powder is subjected to lipophilic treatment in order to obtain mobility in the oily liquid of the magnetic powder dispersed in the oily liquid within the microcapsule. system.
吸収性磁性粉と共に分散する光反射性非磁性粉は平均粒
径が０．０１ミクロンから数ミクロンの範囲にあり、油
状液体中の分散及び可動性を得るためにその表面に親油
処理を施したことを特徴とする請求項１記載の磁気ディ
スプレーシステム。5. The light-reflecting non-magnetic powder dispersed together with the light-absorbing magnetic powder in the oil-like liquid in the microcapsules has an average particle size in the range of 0.01 microns to several microns. 2. The magnetic display system according to claim 1, wherein the surface of the magnetic display system is subjected to lipophilic treatment in order to obtain movability.
散する光吸収性磁性粉と光反射性非磁性粉の配合比が１
：８から１：１の範囲に含まれることを特徴とする請求
項１記載の磁気ディスプレーシステム。6. The blending ratio of light-absorbing magnetic powder and light-reflecting non-magnetic powder dispersed in the oily liquid in the microcapsule is 1.
2. The magnetic display system according to claim 1, wherein the magnetic display system has a ratio of 1:8 to 1:1.
れ分散または溶解した光吸収性の優れた表面特性を有す
る磁性粉と光反射性の優れた特性を有する非磁性粉を封
入したマイクロカプセル塗布層を施す構造を有するディ
スプレーと、そのディスプレーに塗布されているマイク
ロカプセル塗布層の全面に亘ってマイクロカプセル内の
光吸収性磁性粉をディスプレーの裏面側に吸引移動させ
、その結果として光反射性の非磁性粉をディスプレーの
表面側に移動させる手段として、及び前記によってディ
スプレーの裏面側に吸引移動した光吸収性磁性粉を局部
的に表面側に吸引移動させてその部分の光反射性非磁性
粉の位置を反転させることによって文字や像を形成させ
る手段として永久磁石を用いた磁気装置よりなる磁気デ
ィスプレーシステムにおいて、非磁性体基板に塗布する
油状液体中に分散した光吸収性磁性粉と光反射性非磁性
粉を封入したマイクロカプセルの塗布層に、そのマイク
ロカプセルの平均粒径よりはるかに微小粒径の、実質的
に透明な油状液体のみを封入した含油マイクロカプセル
を適量添加して塗布したことを特徴とする磁気ディスプ
レーシステム。7. Microcapsules in which a non-magnetic substrate is encapsulated with magnetic powder having an excellent light-absorbing surface property and non-magnetic powder having an excellent light-reflecting property, each dispersed or dissolved in an oily liquid. The display has a structure in which a coating layer is applied, and the light-absorbing magnetic powder in the microcapsules is attracted and moved to the back side of the display over the entire surface of the microcapsule coating layer coated on the display, resulting in light reflection. As a means for moving the magnetic non-magnetic powder to the front side of the display, and by locally attracting and moving the light-absorbing magnetic powder that has been attracted and moved to the back side of the display to the front side, the light-reflecting non-magnetic powder of that part is moved. In a magnetic display system consisting of a magnetic device that uses permanent magnets as a means of forming characters or images by reversing the position of magnetic powder, light-absorbing magnetic powder and light-absorbing magnetic powder dispersed in an oily liquid applied to a non-magnetic substrate are used. By adding an appropriate amount of oil-containing microcapsules containing only a substantially transparent oily liquid, the particle size of which is much smaller than the average particle size of the microcapsules, to the coating layer of microcapsules containing light-reflecting non-magnetic powder. A magnetic display system characterized by a coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2409271A JP2850056B2 (en) | 1990-12-28 | 1990-12-28 | Magnetic display system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2409271A JP2850056B2 (en) | 1990-12-28 | 1990-12-28 | Magnetic display system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04233581A true JPH04233581A (en) | 1992-08-21 |
| JP2850056B2 JP2850056B2 (en) | 1999-01-27 |
Family
ID=18518618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2409271A Expired - Lifetime JP2850056B2 (en) | 1990-12-28 | 1990-12-28 | Magnetic display system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2850056B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0729145A (en) * | 1993-06-24 | 1995-01-31 | Toppan Printing Co Ltd | Magnetic recording body and recording method and erasing method of magnetic recording body |
| DE19529264A1 (en) * | 1994-08-10 | 1996-02-22 | Chemitech Inc | Magnetic display microcapsules and method of making magnetic display sheets using such microcapsules |
| JPH10123987A (en) * | 1996-10-21 | 1998-05-15 | Star Micronics Co Ltd | Magnetic head for magnetic display |
| JPH1176801A (en) * | 1997-07-16 | 1999-03-23 | Matsumoto Yushi Seiyaku Co Ltd | Micro capsule containing magnetic body and use thereof |
| JPH11115379A (en) * | 1997-10-17 | 1999-04-27 | Pilot Corp | Coloring method for color magnetic particle for magnetic display panel |
| US7561140B1 (en) | 2008-06-09 | 2009-07-14 | Japan Capsular Products, Inc. | Microcapsule magnetic migration display |
| CN112147830A (en) * | 2019-06-27 | 2020-12-29 | 日本胶囊制造股份公司 | Microcapsule magnetophoretic display capable of being erased from surface |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022029877A1 (en) * | 2020-08-04 | 2022-02-10 | Ｚｅｒｏ Ｌａｂ株式会社 | Magnetic sheet, magnetic writing system, drawing method, and erasing method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50160046A (en) * | 1974-06-10 | 1975-12-25 | ||
| JPS526376A (en) * | 1975-06-30 | 1977-01-18 | Ibm | Emulsion |
-
1990
- 1990-12-28 JP JP2409271A patent/JP2850056B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50160046A (en) * | 1974-06-10 | 1975-12-25 | ||
| JPS526376A (en) * | 1975-06-30 | 1977-01-18 | Ibm | Emulsion |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0729145A (en) * | 1993-06-24 | 1995-01-31 | Toppan Printing Co Ltd | Magnetic recording body and recording method and erasing method of magnetic recording body |
| DE19529264A1 (en) * | 1994-08-10 | 1996-02-22 | Chemitech Inc | Magnetic display microcapsules and method of making magnetic display sheets using such microcapsules |
| DE19529264B4 (en) * | 1994-08-10 | 2006-04-13 | Chemitech Inc., Fuchu | A magnetic recording and display apparatus and method of making the same |
| JPH10123987A (en) * | 1996-10-21 | 1998-05-15 | Star Micronics Co Ltd | Magnetic head for magnetic display |
| JPH1176801A (en) * | 1997-07-16 | 1999-03-23 | Matsumoto Yushi Seiyaku Co Ltd | Micro capsule containing magnetic body and use thereof |
| JPH11115379A (en) * | 1997-10-17 | 1999-04-27 | Pilot Corp | Coloring method for color magnetic particle for magnetic display panel |
| US7561140B1 (en) | 2008-06-09 | 2009-07-14 | Japan Capsular Products, Inc. | Microcapsule magnetic migration display |
| CN112147830A (en) * | 2019-06-27 | 2020-12-29 | 日本胶囊制造股份公司 | Microcapsule magnetophoretic display capable of being erased from surface |
| JP2021006844A (en) * | 2019-06-27 | 2021-01-21 | 株式会社日本カプセルプロダクツ | Microcapsule magnetophoresis display erasable from recording surface side |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2850056B2 (en) | 1999-01-27 |
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