JP2004050740A

JP2004050740A - Magnetic substance reverse display panel

Info

Publication number: JP2004050740A
Application number: JP2002213968A
Authority: JP
Inventors: Tomoaki Nishikawa; 西川　知明
Original assignee: Pilot Corp
Current assignee: Pilot Corp
Priority date: 2002-07-23
Filing date: 2002-07-23
Publication date: 2004-02-19
Anticipated expiration: 2022-07-23
Also published as: JP4014203B2

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a display body, such as a ruled line, of a magnetic substance reverse display panel from being scraped off by a magnetic pen etc., and a writing line from being broken off even when it overlaps with the display body. <P>SOLUTION: A writing surface is formed from a first writing surface composed of the first liquid housing chamber housing the first dispersion containing the first dispersed magnetic substance in which an S pole side surface part is colored in the first color, and an N pole side surface part is colored in the second color and the second writing surface, forming the display body, composed of the second liquid housing chamber housing the second dispersion containing the second dispersed magnetic substance in which an S pole side surface part is colored in the second color or the third color, and an N pole side surface part is colored in the first color or fourth color. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、筆記面に予め罫線や文字や模様等の表示体を設けた磁性体反転表示パネルに関する。
【０００２】
【従来の技術】
従来より、例えばＳ極側表面部分を緑にＮ極側表面部分を白に着色した磁性体を分散媒と増稠剤とを主成分とする降伏値を有する液体中に分散してなした分散液体を、複数の液体収容室（例えば裏面板の上に配した隔壁により仕切られたハニカムセル）に収容し、該液体収容室の表側に透明な表面板を配して筆記面とし、筆記面が白色の状態（Ｎ極側表面部分が筆記面に向いた状態）で、磁気ペンのＮ極を近づけることにより、磁力で磁性体を反転させて白色（Ｎ極側表面部分が筆記面に向いた状態）の背景部に緑色（Ｓ極側表面部分が筆記面に向いた状態）の筆記線を構成するいわゆる磁性体反転表示パネルは知られている。
【０００３】
また最近では、磁性体反転表示パネルの筆記面に、黒板やホワイトボードのように予め罫線や文字や模様等の表示体を設けることが望まれている。前記表示体を磁気パネルの筆記面に設ける方法としては、表面板の表側に直接印刷インキで印刷を行うものが実用新案登録第３０７５１９７号公報に記載されており、また、ホワイトボードでは、筆記面に色つきの粘着テープを貼付けて罫線とするものが良く知られている。
【０００４】
【発明が解決しようとする課題】
しかしながら、磁性体反転表示パネルの表面板は透明な樹脂で形成されているため、鋼板等で形成するホワイトボートとは異なり、印刷した後に焼き付け加工を行うことができず、印刷インキの定着性が低く、筆記面に磁気ペンや磁気イレーザーを当接して繰返しの書消しを行っていると、表示体が表面板から剥がれて見辛くなってしまうという問題がある。また、筆記面に色つきの粘着テープを貼付けて罫線とした場合も同様に、磁気ペンや磁気イレーザーに擦られて粘着テープが剥がれて見辛くなってしまうという問題があった。さらに、上記いずれの方法においても、筆記面から罫線等の表示体が浮き出た状態となるため、筆記時に磁気ペンが引っ掛かって筆記感が悪くなったり、ゴミや汚れが付着して表示体の視認性が悪くなるという問題があり、さらに、磁性体反転表示パネルは透明な表面板の裏側で磁性体による筆記線が構成される構造であるため、筆記線が表示体と重なった場合には、筆記線が表示体の裏に隠されてしまい、筆記線が途切れてしまうという問題があった。
【０００５】
本発明はこうした事実に鑑み、磁性体反転表示パネルが有する罫線等の表示体が、磁気ペン等に擦られて剥がれることがないものとし、また、筆記線が表示体と重なった場合においても、筆記線が途切れてしまうことがないものとすることを目的とする。
【０００６】
【課題を解決するための手段】
次に、前記課題を解決するために案出した本発明を説明する。
「１．Ｓ極側表面部分とＮ極側表面部分とを異なる色に着色した磁性体を分散媒と増稠剤とを主成分とする降伏値を有する液体中に分散してなした分散液体を、複数の液体収容室に収容し、該液体収容室の上側に筆記面となる透明な表面板を設けてなる磁性体反転表示パネルにおいて、筆記面を、Ｓ極側表面部分を第一の色に着色しＮ極側表面部分を第二の色に着色した第一の磁性体を分散した第一の分散液体を収容した第一の液体収容室で構成した第一筆記面と、Ｓ極側表面部分を前記第二の色又は第三の色に着色しＮ極側表面部分を前記第一の色又は第四の色に着色した第二の磁性体を分散した第二の分散液体を収容した第二の液体収容室で構成した、表示体を形成する第二筆記面とで形成したことを特徴とする。
２．Ｓ極側表面部分を第一の色に着色し、Ｎ極側表面部分を第二の色に着色した第一の磁性体を分散媒と増稠剤とを主成分とする降伏値を有する液体中に分散してなした分散液体を、複数の第一の液体収容室に収容し、該第一の液体収容室を透明な中板で被覆し、該透明な中板の上側に、凹部を設けてＳ極側表面部分を前記第二の色又は第三の色に着色しＮ極側表面部分を前記第一の色又は第四の色に着色した第二の磁性体を分散した第二の分散液体を収容した第二の液体収容室を形成し、前記透明な中板の上側に筆記面となる透明な表面板を配し、筆記面における前記第二の液体収容室の上面部分で表示体を構成する第二筆記面とし、その他の部分を第一筆記面としたことを特徴とする。」
【０００７】
本発明における罫線や文字や模様等の表示体は、第一筆記面における第一の液体収容室に収容した第一の磁性体の色と、第二筆記面における第二の液体収容室に収容した第二の磁性体の色の相違により現出するので、色の較差を出すことが重要である。尚、本発明における異なる色とは、色相、明度、彩度の少なくともいずれかの要素が違うものである。
【０００８】
また、本発明における磁性体反転表示パネルは、第一の液体収容室の第一の磁性体と第二の液体収容室の第二の磁性体とが入り混り、第一筆記面（背景部）と表示体との色の較差が減少して、筆記線や表示体の鮮明性が損なわれないようにするために、成形時に第一の磁性体と第二の磁性体とが混ざらないようにすることが好ましい。
【０００９】
【発明の実施の形態】
本発明を理解し易くするために図を用いて説明を行なう。図１は第一の実施の形態の磁性体反転表示パネルの第一状態を示す平面図で、図２は図１の要部断面模式図である。図２を用いて磁性体反転表示パネルの内部構造を簡単に説明をすると、磁性体反転表示パネル１は、筆記面２ａとなる透明な表面板２と裏面板３との間に、板材からなる隔壁４ａを組合わせて形成したハニカムセル４と、真空圧成形により成型した、隔壁５ａと隔壁間を連接する底部５ｂと底部の反対側に位置する折返部５ｃとで構成した有底のハニカムセル５とを介在させ、隔壁４ａ同士の間及び隔壁４ａと隔壁５ａとの間を第一の液体収容室６ａとし、隔壁５ａ同士の間を第二の液体収容室６ｂとしてある。また、Ｓ極側表面部分を緑色に着色しＮ極側表面部分を白色に着色した第一の磁性体８ａを分散媒と増稠剤とを主成分とする降伏値を有する液体７中に分散してなした分散液体９ａを、第一の液体収容室６ａに収容し、同液体７中にＳ極側表面部分を白色に着色しＮ極側表面部分を緑色に着色した第二の磁性体８ｂを分散した第二の分散液体９ｂを、液体収容室６ｂに収容してある。
【００１０】
図３は、本実施の形態の磁性体反転表示パネル１の製造工程の一部を示すものである。図３を用いて磁性体反転表示パネルの製造工程の一部を簡単に説明すると、初めに、有底のハニカムセル５を底部５ｂが下となるように配置して開口部を上に向けて（図２，図３における上下を反対にした状態）、第二の液体収容室６ｂに第二の分散液体９ｂを収容し、裏面板３を隔壁５ａ及び折返部５ｃに接着して第二の分散液体９ｂを封入し、次いで上下を反転し、図３に示すように、裏面板３の有底のハニカムセル５の隣りに、ハニカムセル４の隔壁４ａを接着して第一の液体収容室６ａを形成し、第一の液体収容室６ａに第一の分散液体９ａを収容し、次いで透明な表面板２をハニカムセル４の隔壁４ａ及びハニカムセル５の底部５ｂに接着して第一の分散液体を封入し（図２参照）、形成してある。
【００１１】
また、図２に示すように、第一状態の磁性体反転表示パネル１は、筆記面２ａに磁気イレーザー５０のＳ極を接触させた状態で往復動させてあり、磁気イレーザー５０の磁力ｇ（図中の一点鎖線の矢印）により、第一の磁性体８ａ及び第二の磁性体８ｂのいずれもが筆記面２ａにＮ極を向けてあり、第一の分散液体９ａに分散した第一の磁性体８ａで白色（Ｎ極側表面部分）の第一筆記面１０ａを構成し、第二の分散液体９ｂに分散した第二の磁性体８ｂで罫線となる緑色（Ｎ極側表面部分）の第二筆記面１０ｂを構成してある。
【００１２】
図４は、磁気ペンで、第一状態の磁性体反転表示パネル１の筆記面２ａに筆記を行ったときの平面図で、図５は図４の要部断面模式図である。図５に示すように、磁性体反転表示パネル１は、磁気ペン６０の前方部に配設した磁石６１のＮ極を、筆記面２ａに接触させた状態で矢印Ｖ方向へ動かし、磁気ペン６０の磁力ｈ（図中の一点鎖線の矢印）で第一の磁性体８ａ及び第二の磁性体８ｂを反転させ、磁気ペン６０の移動間にある（図５におけるＡ間にある）両磁性体８ａ，８ｂのＳ極を筆記面２ａに向けてある。図４，図５に示すように、筆記線Ａは、第一の磁性体部分Ａ１と第二の磁性体部分Ａ２とで線色が異なるものの、第二筆記面１０ｂに重なっている第二の磁性体部分Ａ２は、筆記面２ａに白色（Ｓ極側表面部分）を向けてあり、磁気ペン６０が通過していない第二筆記面１０ｂは緑色（Ｎ極側表面部分）であるため、結果的に重なった部分の筆記線は判別でき、途切れることなく表示がなされる。
【００１３】
図６は本実施の形態の磁性体反転表示パネルの第二状態を示す平面図で、図７は図６の要部断面模式図である。第二状態の磁性体反転表示パネル１は、筆記面２ａに磁気イレーザー５０のＮ極を接触させた状態で往復動させてあり、磁気イレーザー５０の磁力ｉ（図中の一点鎖線の矢印）により、第一の磁性体８ａ及び第二の磁性体８ｂのいずれもが、筆記面２ａにＳ極を向けており、第一の分散液体９ａに分散した第一の磁性体８ａで緑色（Ｓ極側表面部分）の第一筆記面１０ａを構成し、第二の分散液体９ｂに分散した第二の磁性体８ｂで罫線となる白色（Ｓ極側表面部分）の第二筆記面１０ｂを構成してある。尚、第二状態の磁性体反転表示パネル１に筆記線を書くには、先端にＳ極を有する磁気ペンを使用する。
【００１４】
図８は、磁気ペンで、第二状態の磁性体反転表示パネル１の筆記面２ａに筆記を行ったときの平面図で、図９は図８の要部断面模式図である。図９に示すように、磁性体反転表示パネル１は、磁気ペン７０の前方部に配設した磁石７１のＳ極を、筆記面２ａに接触させた状態で矢印Ｗ方向へ動かし、磁気ペン７１の磁力ｊ（図中の一点鎖線の矢印）で第一の磁性体８ａ及び第二の磁性体８ｂを反転させ、磁気ペン７０の移動間にある（図９におけるＢ間にある）両磁性体８ａ，８ｂのＮ極を筆記面２ａに向けてある。図８，図９に示すように、筆記線Ｂは、第一の磁性体部分Ｂ１と第二の磁性体部分Ｂ２とで線色が異なるものの、第二筆記面１０ｂに重なっている第二の磁性体部分Ｂ２は、筆記面２ａに緑色（Ｎ極側表面部分）を向けてあり、磁気ペン７０が通過していない第二筆記面１０ｂは白色（Ｓ極側表面部分）であるため、結果的に重なった部分の筆記線は判別でき、途切れることなく表示がなされる。
【００１５】
図１０は、第二の実施の形態の磁性体反転表示パネルを示す平面図で、図１１は図１０の要部断面模式図である。磁性体反転表示パネル１０１は、筆記面２ａとなる透明な表面板２と裏面板３との間に、板材からなる隔壁４ａを組合わせて形成したハニカムセル４を介在させてある。図中１０ａの部分は第一の液体収容室１０６ａとして前記第一の実施の形態と同様の分散液体９ａを収容して第一筆記面としてあり、１０ｂの部分は分散液体９ｂを収容して第二筆記面としてある。尚、本実施の形態では、隣り合う第一の液体収容室１０６ａと第二の液体収容室１０６ｂとに収容する、第一の磁性体８ａと第二の磁性体８ｂとが混ざらないようにするために、その製造時においては、裏面板３にハニカムセルを固着して双方の液体収容室１０６ａ，１０６ｂを形成し、第一の液体収容室１０６ａには第一の磁性体８ａを、第二の液体収容室１０６ｂには第二の磁性体８ｂを入れて、裏面板３の裏から磁石で双方の磁性体８ａ，８ｂを該裏面板３側に引き寄せた上で、液体７を双方の液体収容室１０６ａ，１０６ｂに収容させ、透明な表面板２をハニカムセル４の隔壁４ａに接着して第一の分散液体９ａ及び第二の分散液体９ｂを封入する工程としてある。他の構造及び作用は、前記第一の実施の形態の磁性体反転表示パネル１と同様であるため説明を省略する。
【００１６】
図１２は第三の実施の形態の磁性体反転表示パネルの第一状態を示す平面図で、図１３は図１２の要部断面模式図である。図１３を用いて磁性体反転表示パネルの内部構造を簡単に説明をすると、磁性体反転表示パネル２０１は、筆記面２０２ａとなる第一の透明な表面板２０２と第二の透明な表面板２２０とを貼り合わせ、第二の透明な表面板２２０と裏面板３との間に、板材からなる隔壁２０４ａを組合わせて形成したハニカムセル２０４を介在させてある。隔壁２０４ａ同士の間は第一の液体収容室２０６ａとしてある。第二の透明な表面板２２０の表側には、溝２２０ａを刻装してあり、溝２２０ａ内を第二の液体収容室２０６ｂとしてある。また、Ｓ極とＮ極を有しＳ極側表面部分を緑色に着色しＮ極側表面部分を白色に着色した第一の磁性体８ａを分散媒と増稠剤とを主成分とする降伏値を有する液体中７中に分散した第一の分散液体９ａを、液体収容室２０６ａに収容し、同液体７中にＳ極とＮ極を有しＳ極側表面部分を白色に着色しＮ極側表面部分を緑色に着色した第二の磁性体８ｂを分散した第二の分散液体９ｂを、第二の液体収容室２０６ｂに収容してある。
【００１７】
次に、磁性体反転表示パネル２０１の製造工程の一部を簡単に説明すると、初めに、ハニカムセル２０４ａに裏面板３を接着して第一の液体収容室２０６ａを形成し、第一の液体収容室２０６ａに第一の分散液体９ａを収容し、第二の透明な表面板２２０の裏側にハニカムセル２０４の隔壁２０４ａを接着して第一の分散液体２０９ａを封入し、第二の透明な表面板２２０の表側に設けた第二の液体収容室２０６ｂ（溝２２０ａ）に第二の分散液体９ｂを収容し、第二の透明な表面板２２０の表側に第一の透明な表面板２０２を接着し、第二の分散液体９ｂを第二の液体収容室２０６ｂに封入し、形成してある。
【００１８】
また、図１３に示すように、第一状態の磁性体反転表示パネル２０１は、筆記面２０２ａに磁気イレーザー５０のＳ極を接触させた状態で往復動させてあり、磁気イレーザー５０の磁力ｇ（図中の一点鎖線の矢印）により、第一の磁性体８ａ及び第二の磁性体８ｂのいずれもが、筆記面２ａにＮ極を向けており、第一の分散液体９ａに分散した第一の磁性体８ａで白色（Ｎ極側表面部分）の第一筆記面１０ａを構成し、第二の分散液体９ｂに分散した第二の磁性体８ｂで罫線となる緑色（Ｎ極側表面部分）の第二筆記面１０ｂを構成してある。
【００１９】
図１４は、磁気ペンで、第一状態の磁性体反転表示パネル２０１の筆記面２０２ａに筆記を行ったときの平面図で、図１５は図１４の要部断面模式図である。図１５に示すように、磁性体反転表示パネル２０１は、磁気ペン６０の前方部に配設した磁石６１のＮ極を筆記面２０２ａに接触させた状態で矢印Ｘ方向へ動かし、磁気ペン６０の磁力ｈ（図中の一点鎖線の矢印）で第一の磁性体８ａ及び第二の磁性体８ｂを反転させ、磁気ペン６０の移動間にある（図１５におけるＣ間にある）両磁性体８ａ，８ｂのＳ極を筆記面２０２ａに向けてある。図１４，図１５に示すように、筆記線Ｃは、第一の磁性体部分Ｃ１と第二の磁性体部分Ｃ２とで線色が異なるものの、第二筆記面１０ｂに重なっている第二の磁性体部分Ｃ２は、筆記面２０２ａに白色（Ｓ極側表面部分）を向けてあり、磁気ペン６０が通過していない第二筆記面１０ｂは緑色（Ｎ極側表面部分）であるため、結果的に重なった部分の筆記線は判別でき、途切れることなく表示がなされる。
【００２０】
図１６は第三の実施の形態の磁性体反転表示パネルの第二状態を示す平面図で、図１７は図１６の要部断面模式図である。第二状態の磁性体反転表示パネル２０１は、筆記面２０２ａに磁気イレーザー５０のＮ極を接触させた状態で往復動させてあり、磁気イレーザー５０の磁力ｉ（図中の一点鎖線の矢印）により、第一の磁性体８ａ及び第二の磁性体８ｂのいずれもが、筆記面２０２ａにＳ極を向けており、第一の分散液体９ａに分散した第一の磁性体８ａで緑色（Ｓ極側表面部分）の第一筆記面１０ａを構成し、第二の分散液体９ｂに分散した第二の磁性体８ｂで罫線となる白色（Ｓ極側表面部分）の第二筆記面１０ｂを構成してある。尚、第二状態の磁性体反転表示パネル２０１に筆記線を書くには、先端にＳ極を有する磁気ペンを使用する。
【００２１】
図１８は、磁気ペンで、第二状態の磁性体反転表示パネル２０１の筆記面２０２ａに筆記を行ったときの平面図で、図１９は図１８の要部断面模式図である。図１９に示すように、磁性体反転表示パネル２０１は、磁気ペン７０の前方部に配設した磁石７１のＳ極を、筆記面２０２ａに接触させた状態で矢印Ｙ方向へ動かし、磁気ペン７０の磁力ｊ（図中の一点鎖線の矢印）で第一の磁性体８ａ及び第二の磁性体８ｂを反転させ、磁気ペン７０の移動間にある（図１９におけるＤ間にある）両磁性体８ａ，８ｂのＮ極を筆記面２０２ａに向けてある。図１８，図１９に示すように、筆記線Ｄは、第一の磁性体部分Ｄ１と第二の磁性体部分Ｄ２とで線色が異なるものの、第二筆記面１０ｂに重なっている第二の磁性体部分Ｄ２は、筆記面２０２ａに緑色（Ｎ極側表面部分）を向けてあり、磁気ペン７０が通過していない第二筆記面１０ｂは白色（Ｓ極側表面部分）であるため、結果的に重なった部分の筆記線は判別でき、途切れることなく表示がなされる。
【００２２】
以上、本発明の実施の形態を詳述したが、本発明は、前記形態例に限定されるものではなく、特許請求の範囲に記載した本発明の要旨の範囲内で種々の変更を行うことができる。例えば、マイクロカプセルを液体収容室として分散液体（磁性体を降伏値を有する液体中に分散した液体）を収容したパネル構造のものに採用することも可能である。また、本実施の形態のように第一の磁性体を緑色と白色に色分けした場合に、第二の磁性体の色を、例えば青色と赤色のように、第一の磁性体の色と全く異なる組合せに着色しても良い。
【００２３】
また、図２０は本発明の変形例を示す参考姿図で、磁性体反転表示パネル３０１は、背景部となる第一筆記面１０ａを構成する第一の磁性体のＳ極側表面部分を青色、罫線となる第二筆記面１０ｂを構成する第二の磁性体のＳ極側表面部分を黄色、反対に、第一の磁性体のＮ極側表面部分は黄色、第二の磁性体のＮ極側表面部分は青色、となるように双方の磁性体の同じ磁極の色において大きな差を設けて着色してあることから、図２０Ａに示す第一筆記面１０ａが黄色で第二筆記面１０ｂが青色の状態の筆記面３０２ａにおいても、磁石８０を矢印方向に移動させて変化させた図２０Ｂに示す第一筆記面１０ａが青色で第二筆記面１０ｂが黄色の状態の筆記面３０２ａにおいても、第一筆記面１０ａ（背景部）に対して第二筆記面１０ｂ（罫線）は常に見易いものである。この関係は第一筆記面と筆記線との関係にも成立するので好ましい。また、図に示すように筆記面に対して幅広くＳ極とＮ極とが並行して接触することのできる磁石や、あるいは広い面積で筆記面に対して接触できる磁石を用いた場合には、第一筆記面（背景部）と第二筆記面（表示体）の色を同時に簡単に入れ替えさせることができるという作用効果が生じる。これに対し、図２１は、従来の罫線を設けた磁性体反転表示パネルを示す参考姿図で、磁性体反転表示パネル４０１は、第一の磁性体のＳ極側表面部分を青色、Ｎ極側表面部分を黄色に着色してあり、筆記面４０２ａには黒色のインキで印罫線４０２ｂを設けてある。筆記面４０２ａが黄色の状態（図２１Ａの状態）においては罫線４０２ｂは見易いが、磁石８０を矢印方向に移動させて変化させた青色の状態（図２１Ｂ）においては罫線４０２ｂは見辛くなってしまう。
【００２４】
【発明の効果】
本発明の磁性体反転表示パネルは前述したような構造なので、罫線等の表示体が透明な表面板の板面から浮き出た状態とならず、磁気ペン等に擦られて剥がれることがないものとなり、また、筆記線が表示体と重なった場合においても、筆記線が途切れてしまうことがないものとなった。
【図面の簡単な説明】
【図１】第一の実施の形態の磁性体反転表示パネルの第一状態を示す平面図である。
【図２】図１の要部断面模式図である。
【図３】第一の実施の形態の磁性体反転表示パネルの製造工程の一部を示すものである。
【図４】磁気ペンで、第一の実施の形態の第一状態の磁性体反転表示パネルの筆記面に筆記を行ったときの平面図である。
【図５】図４の要部断面模式図である。
【図６】第一の実施の形態の磁性体反転表示パネルの第二状態を示す平面図である。
【図７】図６の要部断面模式図である。
【図８】磁気ペンで、第一の実施の形態の第二状態の磁性体反転表示パネルの筆記面に筆記を行ったときの平面図である。
【図９】図８の要部断面模式図である。
【図１０】第二の実施の形態の磁性体反転表示パネルの第一状態を示す平面図である。
【図１１】図１０の要部断面模式図である。
【図１２】第三の実施の形態の磁性体反転表示パネルの第一状態を示す平面図である。
【図１３】図１２の要部断面模式図である。
【図１４】磁気ペンで、第三の実施の形態の第一状態の磁性体反転表示パネルの筆記面に筆記を行ったときの平面図である。
【図１５】図１４の要部断面模式図である。
【図１６】第三の実施の形態の磁性体反転表示パネルの第二状態を示す平面図である。
【図１７】図１６の要部断面模式図である。
【図１８】磁気ペンで、第三の実施の形態の第二状態の磁性体反転表示パネルの筆記面に筆記を行ったときの平面図である。
【図１９】図１８の要部断面模式図である。
【図２０】本発明の変形例を示す参考姿図である。
【図２１】従来の罫線を設けた磁性体反転表示パネルを示す参考姿図である。
【符号の説明】
１，１０１，２０１，３０１，４０１…磁性体反転表示パネル、
２，２０２…透明な表面板、２ａ，２０２ａ，３０２ａ，４０２ａ…筆記面、
２０２…第一の透明な表面板、２０２ａ…筆記面、
２２０…第二の透明な表面板、２２０ａ…溝、
３…裏面板、
４，２０４…ハニカムセル、４ａ，２０４ａ…隔壁、
５…有底のハニカムセル、５ａ…隔壁、５ｂ…底部、５ｃ…折返部、
６ａ，１０６ａ，２０６ａ…第一の液体収容室、
６ｂ，１０６ｂ，２０６ｂ…第二の液体収容室、
７…液体、８ａ…第一の磁性体、８ｂ…第二の磁性体、
９ａ…第一の分散液体、９ｂ…第二の分散液体。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a magnetic body reversal display panel provided with a display such as a ruled line, a character, and a pattern on a writing surface in advance.
[0002]
[Prior art]
Conventionally, for example, a magnetic material in which the S pole side surface portion is colored green and the N pole side surface portion is colored white is dispersed in a liquid having a yield value containing a dispersion medium and a thickener as main components. The liquid is stored in a plurality of liquid storage chambers (for example, honeycomb cells separated by partitions arranged on a back plate), and a transparent surface plate is disposed on the front side of the liquid storage chamber to form a writing surface. Is in a white state (a state in which the N pole side surface portion faces the writing surface), and the magnetic body is reversed by magnetic force by bringing the N pole of the magnetic pen closer to white (the N pole side surface portion faces the writing surface). A so-called magnetic material inversion display panel is known which forms a green (in a state where the S pole side surface portion faces the writing surface) writing line on a background portion of the writing panel.
[0003]
Recently, it has been desired to provide a display such as a ruled line, a character, a pattern, or the like in advance on a writing surface of a magnetic substance inversion display panel, such as a blackboard or a whiteboard. As a method of providing the display body on a writing surface of a magnetic panel, a method in which printing is performed directly on the front side of a surface plate with printing ink is described in Utility Model Registration No. 3075197, and a white board has a writing surface. It is well known that a colored adhesive tape is adhered to a ruled line.
[0004]
[Problems to be solved by the invention]
However, since the surface plate of the magnetic reversal display panel is formed of a transparent resin, unlike a white boat formed of a steel plate or the like, printing cannot be performed after printing, and the fixability of the printing ink is low. If the writing surface is repeatedly written with a magnetic pen or a magnetic eraser in contact with the writing surface, the display is peeled off from the surface plate and becomes hard to see. Similarly, when a colored adhesive tape is stuck on the writing surface to form a ruled line, similarly, there is a problem that the adhesive tape is peeled off by a magnetic pen or a magnetic eraser and becomes hard to see. Furthermore, in any of the above methods, since the display body such as ruled lines is protruded from the writing surface, the magnetic pen is caught at the time of writing and the writing feeling is deteriorated, and the display body is visually recognized by dust or dirt attached. In addition, there is a problem that the writing property is deteriorated, and further, since the magnetic material inversion display panel has a structure in which the writing line is formed by a magnetic material on the back side of the transparent surface plate, if the writing line overlaps the display body, There is a problem that the writing line is hidden behind the display body and the writing line is interrupted.
[0005]
In view of this fact, the present invention assumes that the display body such as the ruled line of the magnetic body reversal display panel is not peeled off by being rubbed with a magnetic pen or the like, and even when the writing line overlaps the display body, The purpose is to prevent writing lines from being interrupted.
[0006]
[Means for Solving the Problems]
Next, the present invention devised to solve the above problem will be described.
"1. Dispersion liquid obtained by dispersing a magnetic material in which the S-pole side surface portion and the N-pole side surface portion are colored differently in a liquid having a yield value containing a dispersion medium and a thickener as main components. Is stored in a plurality of liquid storage chambers, and a transparent surface plate serving as a writing surface is provided above the liquid storage chamber. A first writing surface formed of a first liquid storage chamber containing a first dispersion liquid in which a first magnetic material in which a first magnetic material colored in a color and an N pole side surface portion is colored in a second color is stored; A second dispersion liquid in which a side surface portion is colored with the second color or the third color, and the N pole side surface portion is dispersed with the second magnetic material colored with the first color or the fourth color. It is characterized by being formed by a second writing surface that forms a display body and is constituted by a second liquid storage chamber that is stored.
2. A liquid having a yield value in which a first magnetic substance whose S pole side surface portion is colored in a first color and whose N pole side surface portion is colored in a second color is composed mainly of a dispersion medium and a thickener. The dispersion liquid dispersed therein is accommodated in a plurality of first liquid storage chambers, the first liquid storage chamber is covered with a transparent middle plate, and a concave portion is formed on the upper side of the transparent middle plate. A second magnetic material in which a second magnetic body in which the S pole side surface portion is colored in the second color or the third color and the N pole side surface portion is colored in the first color or the fourth color is provided. Forming a second liquid storage chamber containing the dispersion liquid, a transparent surface plate serving as a writing surface is disposed above the transparent middle plate, and an upper surface portion of the second liquid storage chamber in the writing surface. A second writing surface constituting the display body is provided, and other portions are provided as first writing surfaces. "
[0007]
In the present invention, a display body such as a ruled line, a character or a pattern is accommodated in the color of the first magnetic body accommodated in the first liquid accommodation chamber on the first writing surface and in the second liquid accommodation chamber on the second writing surface. It is important to obtain a color difference, because the difference appears due to the difference in color of the second magnetic material. It should be noted that the different colors in the present invention are different from each other in at least one of hue, lightness, and saturation.
[0008]
Further, in the magnetic body reversal display panel of the present invention, the first magnetic body of the first liquid storage chamber and the second magnetic body of the second liquid storage chamber are mixed, and the first writing surface (background portion) is mixed. ) And the display body, so that the first magnetic body and the second magnetic body are not mixed at the time of molding so that the writing line and the sharpness of the display body are not impaired. Is preferable.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will be described with reference to the drawings for easy understanding. FIG. 1 is a plan view showing a first state of the magnetic reversal display panel according to the first embodiment, and FIG. 2 is a schematic sectional view of a main part of FIG. The internal structure of the magnetic material inversion display panel will be briefly described with reference to FIG. 2. The magnetic material inversion display panel 1 is made of a plate material between a transparent front plate 2 serving as a writing surface 2a and a back surface plate 3. Honeycomb cell 4 formed by combining partition walls 4a, bottomed honeycomb cell formed by vacuum pressure molding, and formed with bottom 5b connecting partition walls 5a and the partition walls and folded portions 5c located on the opposite side of the bottom portions. The first liquid storage chamber 6a is formed between the partition walls 4a and between the partition walls 4a and the partition walls 5a, and the second liquid storage chamber 6b is formed between the partition walls 5a. Further, the first magnetic material 8a having the S pole side surface portion colored green and the N pole side surface portion colored white is dispersed in the liquid 7 having a yield value containing a dispersion medium and a thickener as main components. The resulting dispersion liquid 9a is stored in the first liquid storage chamber 6a, and the second magnetic body in which the S pole side surface portion is colored white and the N pole side surface portion is colored green in the same liquid 7 The second dispersion liquid 9b in which the dispersion liquid 8b is dispersed is stored in the liquid storage chamber 6b.
[0010]
FIG. 3 shows a part of the manufacturing process of the magnetic reversal display panel 1 of the present embodiment. A part of the manufacturing process of the magnetic reversal display panel will be briefly described with reference to FIG. 3. First, the bottomed honeycomb cell 5 is arranged so that the bottom 5 b is downward, and the opening is directed upward. (In a state where the upper and lower sides in FIGS. 2 and 3 are turned upside down), the second dispersion liquid 9b is stored in the second liquid storage chamber 6b, and the back plate 3 is bonded to the partition wall 5a and the folded portion 5c to form the second dispersion liquid. The dispersion liquid 9b is sealed and then turned upside down. As shown in FIG. 3, the partition wall 4a of the honeycomb cell 4 is bonded to the bottomed honeycomb cell 5 of the back plate 3, and the first liquid storage chamber is formed. 6a, the first dispersion liquid 9a is stored in the first liquid storage chamber 6a, and then the transparent surface plate 2 is bonded to the partition wall 4a of the honeycomb cell 4 and the bottom 5b of the honeycomb cell 5 to form the first dispersion liquid. A dispersion liquid is enclosed (see FIG. 2) and formed.
[0011]
Further, as shown in FIG. 2, the magnetic body reversal display panel 1 in the first state is reciprocated in a state where the S pole of the magnetic eraser 50 is in contact with the writing surface 2a, and the magnetic force g ( As indicated by the one-dot chain line in the figure), both the first magnetic body 8a and the second magnetic body 8b have the N-pole facing the writing surface 2a and are dispersed in the first dispersion liquid 9a. The magnetic material 8a constitutes a white (N pole side surface portion) first writing surface 10a, and the second magnetic material 8b dispersed in the second dispersion liquid 9b forms a ruled line of green (N pole side surface portion). The second writing surface 10b is configured.
[0012]
FIG. 4 is a plan view when writing is performed on the writing surface 2a of the magnetic body reversal display panel 1 in the first state with a magnetic pen, and FIG. 5 is a schematic cross-sectional view of a main part of FIG. As shown in FIG. 5, the magnetic substance inversion display panel 1 moves the N pole of the magnet 61 disposed in front of the magnetic pen 60 in the direction of the arrow V while keeping the N pole in contact with the writing surface 2a. The first magnetic body 8a and the second magnetic body 8b are reversed by the magnetic force h (the one-dot chain line arrow in the figure), and the two magnetic bodies are between the movements of the magnetic pen 60 (between A in FIG. 5). The south poles 8a and 8b face the writing surface 2a. As shown in FIGS. 4 and 5, the writing line A has a different line color between the first magnetic part A1 and the second magnetic part A2, but has a second writing surface A overlapping the second writing surface 10b. The magnetic portion A2 is white (S pole side surface portion) facing the writing surface 2a, and the second writing surface 10b through which the magnetic pen 60 does not pass is green (N pole side surface portion). It is possible to determine the writing line of the part where the target overlaps, and the display is made without interruption.
[0013]
FIG. 6 is a plan view showing a second state of the magnetic reversal display panel of the present embodiment, and FIG. 7 is a schematic cross-sectional view of a main part of FIG. The magnetic body reversal display panel 1 in the second state is reciprocated in a state where the N pole of the magnetic eraser 50 is in contact with the writing surface 2a, and the magnetic force i of the magnetic eraser 50 (the one-dot chain line arrow in the figure) Each of the first magnetic body 8a and the second magnetic body 8b has the south pole facing the writing surface 2a, and the first magnetic body 8a dispersed in the first dispersion liquid 9a is green (S pole The first writing surface 10a of the side surface portion) and the second magnetic material 8b dispersed in the second dispersion liquid 9b form the second writing surface 10b of the white (S-pole side surface portion) to be the ruled line. It is. Note that a magnetic pen having an S pole at the tip is used to write a writing line on the magnetic reversal display panel 1 in the second state.
[0014]
FIG. 8 is a plan view when writing is performed on the writing surface 2a of the magnetic reversal display panel 1 in the second state with a magnetic pen, and FIG. 9 is a schematic cross-sectional view of a main part of FIG. As shown in FIG. 9, the magnetic substance inversion display panel 1 moves the S pole of the magnet 71 disposed in front of the magnetic pen 70 in the direction of the arrow W while keeping the S pole in contact with the writing surface 2 a. The first magnetic body 8a and the second magnetic body 8b are reversed by the magnetic force j (the one-dot chain line arrow in the figure), and the two magnetic bodies (between B in FIG. 9) during the movement of the magnetic pen 70 The north poles 8a and 8b face the writing surface 2a. As shown in FIGS. 8 and 9, the writing line B has a different line color between the first magnetic body portion B1 and the second magnetic body portion B2, but has the second writing surface B overlapping the second writing surface 10b. The magnetic portion B2 is oriented green (the north pole side surface portion) toward the writing surface 2a, and the second writing surface 10b through which the magnetic pen 70 does not pass is white (the south pole side surface portion). It is possible to determine the writing line of the part where the target overlaps, and the display is made without interruption.
[0015]
FIG. 10 is a plan view showing a magnetic material inversion display panel according to the second embodiment, and FIG. 11 is a schematic sectional view of a main part of FIG. The magnetic material reversal display panel 101 has a honeycomb cell 4 formed by combining a partition 4a made of a plate material between a transparent front plate 2 serving as a writing surface 2a and a back plate 3. In the figure, a portion 10a serves as a first liquid storage chamber 106a containing a dispersion liquid 9a similar to that of the first embodiment and serves as a first writing surface, and a portion 10b contains a dispersion liquid 9b and serves as a first writing surface. There are two writing surfaces. In the present embodiment, the first magnetic body 8a and the second magnetic body 8b housed in the adjacent first liquid housing chamber 106a and second liquid housing chamber 106b are not mixed. Therefore, at the time of manufacture, the honeycomb cells are fixed to the back plate 3 to form the two liquid storage chambers 106a and 106b, and the first liquid storage chamber 106a is provided with the first magnetic body 8a and the second liquid storage chamber 106a. The second magnetic body 8b is put in the liquid storage chamber 106b, and both the magnetic bodies 8a and 8b are attracted to the back plate 3 side by a magnet from the back of the back plate 3, and then the liquid 7 is transferred to both liquids. This is a step of enclosing the first dispersion liquid 9a and the second dispersion liquid 9b by accommodating the transparent surface plate 2 in the accommodation chambers 106a and 106b and adhering the transparent surface plate 2 to the partition wall 4a of the honeycomb cell 4. Other structures and operations are the same as those of the magnetic reversal display panel 1 according to the first embodiment, and thus description thereof is omitted.
[0016]
FIG. 12 is a plan view showing a first state of the magnetic reversal display panel according to the third embodiment, and FIG. 13 is a schematic sectional view of a main part of FIG. The internal structure of the magnetic material inversion display panel will be briefly described with reference to FIG. 13. The magnetic material inversion display panel 201 includes a first transparent surface plate 202 and a second transparent surface plate 220 serving as a writing surface 202a. And a honeycomb cell 204 formed by combining a partition wall 204a made of a plate material is interposed between the second transparent front plate 220 and the back plate 3. The space between the partitions 204a is a first liquid storage chamber 206a. A groove 220a is engraved on the front side of the second transparent surface plate 220, and the inside of the groove 220a serves as a second liquid storage chamber 206b. Further, a first magnetic material 8a having an S pole and an N pole, in which the S pole side surface portion is colored green and the N pole side surface portion is colored white, is a yield mainly composed of a dispersion medium and a thickener. The first dispersion liquid 9a dispersed in the liquid 7 having a value is stored in the liquid storage chamber 206a, and the liquid 7 has an S pole and an N pole, and the S pole side surface portion is colored white to form N The second dispersion liquid 9b in which the second magnetic material 8b whose pole side surface portion is colored green is dispersed is stored in the second liquid storage chamber 206b.
[0017]
Next, a part of the manufacturing process of the magnetic substance inversion display panel 201 will be briefly described. First, the back plate 3 is bonded to the honeycomb cell 204a to form the first liquid storage chamber 206a, and the first liquid storage chamber 206a is formed. The first dispersion liquid 9a is accommodated in the accommodation chamber 206a, the partition wall 204a of the honeycomb cell 204 is adhered to the back side of the second transparent surface plate 220, and the first dispersion liquid 209a is sealed. The second dispersion liquid 9b is stored in the second liquid storage chamber 206b (groove 220a) provided on the front side of the surface plate 220, and the first transparent surface plate 202 is placed on the front side of the second transparent surface plate 220. The second dispersion liquid 9b is sealed and sealed in the second liquid storage chamber 206b to form.
[0018]
As shown in FIG. 13, the magnetic substance inversion display panel 201 in the first state is reciprocated with the S pole of the magnetic eraser 50 in contact with the writing surface 202a, and the magnetic force g ( Both the first magnetic body 8a and the second magnetic body 8b have their N-poles directed to the writing surface 2a, and the first magnetic body 8a and the second magnetic body 8b are dispersed in the first dispersion liquid 9a. Green (N pole side surface portion) which constitutes a white (N pole side surface portion) first writing surface 10a with the magnetic material 8a, and is a ruled line with the second magnetic body 8b dispersed in the second dispersion liquid 9b Of the second writing surface 10b.
[0019]
FIG. 14 is a plan view when writing is performed on the writing surface 202a of the magnetic body reversal display panel 201 in the first state with a magnetic pen, and FIG. 15 is a schematic cross-sectional view of a main part of FIG. As shown in FIG. 15, the magnetic substance inversion display panel 201 moves the N pole of the magnet 61 arranged in front of the magnetic pen 60 in the direction of the arrow X while keeping the N pole of the magnet 61 in contact with the writing surface 202 a. The first magnetic body 8a and the second magnetic body 8b are reversed by the magnetic force h (the one-dot chain line arrow in the figure), and both magnetic bodies 8a between the movements of the magnetic pen 60 (between C in FIG. 15). , 8b face the writing surface 202a. As shown in FIGS. 14 and 15, the writing line C has a different line color between the first magnetic body portion C1 and the second magnetic body portion C2, but has the second writing surface C overlapping the second writing surface 10b. The magnetic portion C2 is white (S pole side surface portion) facing the writing surface 202a, and the second writing surface 10b through which the magnetic pen 60 does not pass is green (N pole side surface portion). It is possible to determine the writing line of the part where the target overlaps, and the display is made without interruption.
[0020]
FIG. 16 is a plan view showing a second state of the magnetic reversal display panel according to the third embodiment, and FIG. 17 is a schematic sectional view of a main part of FIG. The magnetic material reversal display panel 201 in the second state is reciprocated in a state in which the N pole of the magnetic eraser 50 is in contact with the writing surface 202a, and the magnetic force i of the magnetic eraser 50 (the one-dot chain line arrow in the figure) Each of the first magnetic body 8a and the second magnetic body 8b has the south pole facing the writing surface 202a, and the first magnetic body 8a dispersed in the first dispersion liquid 9a is green (S pole The first writing surface 10a of the side surface portion) and the second magnetic material 8b dispersed in the second dispersion liquid 9b form the second writing surface 10b of the white (S-pole side surface portion) to be the ruled line. It is. In order to write a writing line on the magnetic substance inversion display panel 201 in the second state, a magnetic pen having an S pole at the tip is used.
[0021]
FIG. 18 is a plan view when writing is performed on the writing surface 202a of the magnetic body reversal display panel 201 in the second state with a magnetic pen, and FIG. 19 is a schematic cross-sectional view of a main part of FIG. As shown in FIG. 19, the magnetic substance inversion display panel 201 moves the south pole of the magnet 71 disposed in front of the magnetic pen 70 in the direction of the arrow Y while keeping the S pole in contact with the writing surface 202a. The first magnetic body 8a and the second magnetic body 8b are reversed by the magnetic force j (the dashed-dotted arrow in the figure), and the two magnetic bodies are between the movements of the magnetic pen 70 (between D in FIG. 19). The north poles 8a and 8b face the writing surface 202a. As shown in FIGS. 18 and 19, the writing line D has a different line color between the first magnetic part D1 and the second magnetic part D2, but has a second writing surface D overlapping the second writing surface 10b. The magnetic portion D2 is oriented green (the north pole side surface portion) toward the writing surface 202a, and the second writing surface 10b through which the magnetic pen 70 does not pass is white (the south pole side surface portion). It is possible to determine the writing line of the part where the target overlaps, and the display is made without interruption.
[0022]
As described above, the embodiments of the present invention have been described in detail. However, the present invention is not limited to the above embodiments, and various changes may be made within the scope of the present invention described in the appended claims. Can be. For example, it is also possible to adopt a panel structure in which a microcapsule is used as a liquid storage chamber to store a dispersion liquid (a liquid in which a magnetic substance is dispersed in a liquid having a yield value). Further, when the first magnetic body is classified into green and white as in the present embodiment, the color of the second magnetic body is completely different from the color of the first magnetic body, for example, blue and red. Different combinations may be colored.
[0023]
FIG. 20 is a reference view showing a modification of the present invention. In the magnetic body reversal display panel 301, the S pole side surface portion of the first magnetic body constituting the first writing surface 10a serving as the background is blue. The S pole side surface portion of the second magnetic body constituting the second writing surface 10b to be a ruled line is yellow, conversely, the N pole side surface portion of the first magnetic body is yellow, and the N magnetic surface of the second magnetic body is N Since the pole side surface portion is colored with a large difference between the colors of the same magnetic poles of both magnetic bodies so as to be blue, the first writing surface 10a shown in FIG. Also in the writing surface 302a in a blue state, the first writing surface 10a shown in FIG. 20B in which the magnet 80 is changed by moving the magnet 80 in the direction of the arrow is blue and the second writing surface 10b is in a yellow state. , The first writing surface 10a (background portion) with respect to the second writing surface 10b ( Line) it is always easy to see things. This relationship is preferable because the relationship also holds between the first writing surface and the writing line. In addition, as shown in the figure, when a magnet that can widely contact the writing surface with the S pole and the N pole in parallel or a magnet that can contact the writing surface with a large area is used, There is an operational effect that the colors of the first writing surface (background portion) and the second writing surface (display body) can be easily and simultaneously switched. On the other hand, FIG. 21 is a reference drawing showing a conventional magnetic body reversal display panel provided with ruled lines. The side surface portion is colored yellow, and a marking line 402b is provided on the writing surface 402a with black ink. The ruled line 402b is easy to see when the writing surface 402a is yellow (the state in FIG. 21A), but the ruled line 402b is hard to see in the blue state (FIG. 21B) that is changed by moving the magnet 80 in the direction of the arrow. .
[0024]
【The invention's effect】
Since the magnetic reversal display panel of the present invention has the above-described structure, the display body such as the ruled line does not protrude from the surface of the transparent surface plate and does not peel off by being rubbed by a magnetic pen or the like. In addition, even when the writing line overlaps the display body, the writing line is not interrupted.
[Brief description of the drawings]
FIG. 1 is a plan view showing a first state of a magnetic reversal display panel according to a first embodiment.
FIG. 2 is a schematic sectional view of a main part of FIG.
FIG. 3 illustrates a part of the manufacturing process of the magnetic reversal display panel of the first embodiment.
FIG. 4 is a plan view when writing is performed on a writing surface of the magnetic body reversal display panel in the first state of the first embodiment with a magnetic pen.
FIG. 5 is a schematic sectional view of a main part of FIG.
FIG. 6 is a plan view showing a second state of the magnetic reversal display panel according to the first embodiment;
FIG. 7 is a schematic sectional view of a main part of FIG. 6;
FIG. 8 is a plan view when writing is performed on a writing surface of the magnetic body reversal display panel in the second state according to the first embodiment with a magnetic pen.
9 is a schematic cross-sectional view of a main part of FIG.
FIG. 10 is a plan view showing a first state of the magnetic reversal display panel according to the second embodiment.
11 is a schematic cross-sectional view of a main part of FIG.
FIG. 12 is a plan view showing a first state of the magnetic reversal display panel according to the third embodiment.
13 is a schematic cross-sectional view of a main part of FIG.
FIG. 14 is a plan view when writing is performed on a writing surface of a magnetic body reversal display panel in a first state according to the third embodiment with a magnetic pen.
15 is a schematic cross-sectional view of a main part of FIG.
FIG. 16 is a plan view showing a second state of the magnetic reversal display panel according to the third embodiment.
17 is a schematic cross-sectional view of a main part of FIG. 16;
FIG. 18 is a plan view when writing is performed on a writing surface of a magnetic reversal display panel in a second state according to the third embodiment with a magnetic pen.
19 is a schematic cross-sectional view of a main part of FIG. 18;
FIG. 20 is a reference view showing a modification of the present invention.
FIG. 21 is a reference view showing a conventional magnetic body reversal display panel provided with ruled lines.
[Explanation of symbols]
1,101,201,301,401 ... magnetic material inversion display panel,
2, 202: transparent surface plate, 2a, 202a, 302a, 402a: writing surface,
202: first transparent surface plate, 202a: writing surface,
220 ... second transparent face plate, 220a ... groove,
3. Back plate,
4,204: honeycomb cells, 4a, 204a: partition walls,
5 ... Honeycomb cell with bottom, 5a ... Partition wall, 5b ... bottom part, 5c ... folded part,
6a, 106a, 206a ... first liquid storage chamber,
6b, 106b, 206b ... second liquid storage chamber,
7 liquid, 8a first magnetic body, 8b second magnetic body,
9a: first dispersion liquid, 9b: second dispersion liquid.

Claims

A plurality of dispersion liquids are prepared by dispersing a magnetic material in which the S pole side surface portion and the N pole side surface portion are colored in different colors in a liquid having a yield value containing a dispersion medium and a thickener as main components. In the magnetic body reversal display panel having a transparent surface plate serving as a writing surface provided on the upper side of the liquid storage chamber, the writing surface is colored in a first color on the S pole side surface portion. A first writing surface formed of a first liquid storage chamber containing a first dispersion liquid in which a first magnetic material whose N pole side surface portion is colored in a second color is dispersed, and an S pole side surface portion A second dispersion liquid containing a second magnetic material in which the second magnetic material colored in the second color or the third color and the N pole side surface portion is colored in the first color or the fourth color is contained. A magnetic body reversal display panel, comprising: a second writing surface which forms a display body and which is constituted by two liquid storage chambers.

A liquid having a yield value in which a first magnetic substance whose S pole side surface portion is colored in a first color and whose N pole side surface portion is colored in a second color is composed mainly of a dispersion medium and a thickener. The dispersion liquid dispersed therein is accommodated in a plurality of first liquid storage chambers, the first liquid storage chamber is covered with a transparent middle plate, and a concave portion is formed on the upper side of the transparent middle plate. A second magnetic material in which a second magnetic body in which the S pole side surface portion is colored in the second color or the third color and the N pole side surface portion is colored in the first color or the fourth color is provided. Forming a second liquid storage chamber containing the dispersion liquid, a transparent surface plate serving as a writing surface is disposed above the transparent middle plate, and an upper surface portion of the second liquid storage chamber in the writing surface. A magnetic reversal display panel, wherein a second writing surface constituting a display body is used, and other portions are used as a first writing surface.