JPS61211095A - Electronic blackboard device - Google Patents
Electronic blackboard deviceInfo
- Publication number
- JPS61211095A JPS61211095A JP60051980A JP5198085A JPS61211095A JP S61211095 A JPS61211095 A JP S61211095A JP 60051980 A JP60051980 A JP 60051980A JP 5198085 A JP5198085 A JP 5198085A JP S61211095 A JPS61211095 A JP S61211095A
- Authority
- JP
- Japan
- Prior art keywords
- detected
- drawing pen
- conductor
- coordinate
- position coordinates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Drawing Aids And Blackboards (AREA)
- Position Input By Displaying (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明ｒｉ電子黒板装［４こ関し、特に描画面とディス
プレー面が一体化され、離れた場所に設置された二枚の
電子黒板を用いて相互に加筆および修正ができる′電子
黒板装置に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electronic whiteboard system [4] In particular, the drawing surface and the display surface are integrated, and two electronic whiteboards installed at separate locations are used. This invention relates to an electronic whiteboard device that allows mutual additions and corrections.
従来一般に用いられている電子黒板装置は、ライティン
グボード（座標入力板）上に記入された図形や文字を各
点の位置座標を示す電気信号に変換し、これをモニタテ
レビ又はビデオプロジェクタなどの別のディスプレー面
に表示させる装置であり、フロッピーディスクやビデオ
テープに記録させたり、ビデオプリンタを用いてコピー
を作成したり、電話回線等を使用して遠隔地に伝送した
りすることができ、テレビ会議やテレビ講義など各種の
応用が期待されている。ライティングボード上の図形や
文字を電気信号に変換する手段としては、充電変換を使
用する方法のほかに、ライティングホードの表面にＸ軸
およびＹ軸方向に移動する線状の進行電磁界を発生させ
、検出コイルを備えた特殊なフェルトベンを用いてこの
ライティングボード上に図形や文字を描キ、フェルトベ
ンの当てられた位Ｉｔ座標の軌跡を鬼気的情報として検
出記憶させる電磁結合方式（例えば特開昭５９−１８６
０７６号公報蚕照）が知６れている。Electronic whiteboard devices that have been commonly used convert figures and characters written on a writing board (coordinate input board) into electrical signals that indicate the position coordinates of each point, and then transmit these signals to a separate device such as a television monitor or a video projector. It is a device that displays images on the screen of a TV, and can be recorded on a floppy disk or videotape, made copies using a video printer, and transmitted to a remote location using a telephone line, etc. It is expected to be used in various applications such as conferences and TV lectures. In addition to the method of using charging conversion as a means of converting the figures and characters on the writing board into electrical signals, there is also a method of generating a linear traveling electromagnetic field that moves in the X-axis and Y-axis directions on the surface of the writing board. , a special felt ben equipped with a detection coil is used to draw figures and letters on this writing board, and the locus of the It coordinates where the felt ben was hit is detected and stored as magical information using an electromagnetic coupling method (for example, a special 1977-186
Publication No. 076 (Seri Teru) is known.
〔発明が解決すべき問題点」
上述した従来の′電子黒板装置でをま、図形を記入する
ライティングボードと一度寛気信号に変換した図形情報
を再生表示するディスプレー面とは場所も太きさも異な
っているため、テレビ会議などに便用した場合、ディス
プレー面上に表示された図形のライティングボード上の
精確な位置が分からないため、相手の描いた図形に描き
加えたシ修正を行うことが困難であり、黒板を用いた自
由な討議が制約されるという欠点かある。本発明の目的
は、ライティングボードとディバブ１／−面とを一体化
することによって上述の欠点を除去し、遠隔地に設置さ
れた二枚の電子黒板を用いて相互に加筆および修正がで
きる電子黒板装置を提供することである。[Problems to be Solved by the Invention] In the conventional 'electronic blackboard device' described above, the writing board on which figures are written and the display surface on which the graphic information once converted into a leisure signal is reproduced and displayed are different in terms of location and thickness. Because they are different, when used for video conferencing, etc., it is difficult to know the exact position of the figure displayed on the display surface on the writing board, so it is difficult to make corrections to the figure drawn by the other party. The drawback is that it is difficult and restricts free discussion using the blackboard. The purpose of the present invention is to eliminate the above-mentioned drawbacks by integrating a writing board and a dibab 1/- surface, and to provide an electronic board that allows mutual additions and corrections using two electronic blackboards installed in remote locations. The purpose of the present invention is to provide a blackboard device.
本究明の電子黒板装置は、透明な絶縁板で構成されそれ
ぞれ直交する座標軸の一方に平行な細長い多数の導体ル
ープから成る二組の導体ループ群を備えた座標人力板の
背面にビデオプロジェクタ用ノフＬ／ ／ｉ”ルレンズ
板をｍＮさせたツＬ敢乱面を有する電子黒板と、導体コ
イルを備え前記電子黒板の表面に図形等を入力する袖自
ペンと、前記各導体ループをＩＦｔ矢選択してＦｌＩＪ
記等体ループと前記導体コ・ｒル間の電Ｉｊｉｉ結合ｆ
こよる誘専信号を検出し前記描画ペンの位置座標を求め
る座標検出手段と、前記７１／ネル１／ンズ根に画像を
投影表示するビデオプロジェクタと、１＝１１１記座標
検出手段で検出した前記描画ペンの位置座標の軌跡を記
憶し前記ビデオプロジェクタを制御する制御平段とを備
え、前記描画ペンで描いた図形や文字が前記電子黒板上
に表示されるよう番こして構成される。The electronic whiteboard device of the present invention is constructed of a transparent insulating board and has two sets of conductor loops each consisting of a large number of elongated conductor loops parallel to one of orthogonal coordinate axes. An electronic blackboard with a curved surface made of L/ /i'' lens board, a pen equipped with a conductor coil and used to input figures etc. on the surface of the electronic blackboard, and each of the conductor loops selected by the IFt arrow. And FlIJ
Electrical Ijii coupling f between the isoconductor loop and the conductor coil
coordinate detection means for detecting the induced signal and determining the position coordinates of the drawing pen; a video projector for projecting and displaying an image on the 71/Nel 1/Ns root; and a control stage that stores the locus of the position coordinates of the drawing pen and controls the video projector, and is arranged so that figures and characters drawn with the drawing pen are displayed on the electronic blackboard.
次に図面を参照して本究明を詳細に説明する。 Next, the present research will be explained in detail with reference to the drawings.
第１図は本発明の一実施例の構成を示す概念図であり、
描画面とディスプレー面とを兼ねた電子黒板１と、電子
黒板１の表面に図形等を入力する描画ペン２と、描画ペ
ン２の当てられた電子黒板１上の位置座標を検出する座
標検出部３と、電子黒板１上に画像を投影表示するカラ
ービデオプロジェクタ４と、座標検出部３で検出された
位置座標を記憶しカラービデオプロジェクタ４の制御信
号を送出する制御部５とから構成されており、電子黒板
１上に描画ペン２で指示した点の軌跡がカラービデオプ
ロジェクタ４によシ図形や文字として同じ電子黒板１上
に表示される。FIG. 1 is a conceptual diagram showing the configuration of an embodiment of the present invention,
An electronic blackboard 1 that serves as both a drawing surface and a display surface, a drawing pen 2 that inputs figures etc. onto the surface of the electronic blackboard 1, and a coordinate detection unit that detects the coordinates of the position on the electronic blackboard 1 that the drawing pen 2 is applied to. 3, a color video projector 4 that projects and displays an image on the electronic whiteboard 1, and a control section 5 that stores the position coordinates detected by the coordinate detection section 3 and sends out a control signal for the color video projector 4. Then, the locus of the point indicated by the drawing pen 2 on the electronic blackboard 1 is displayed by the color video projector 4 as figures and characters on the same electronic blackboard 1.
第２図は・電子黒板１の実施例の構成を示す斜視図であ
り、描画面を構成しているすり硝子板６、硝子と屈折率
の近い透明なプラスチック板７と、透明硝子板８と、こ
れらの間に設けられたＸ軸に平行な多数の細長い導体ル
ープＸｌ・・・・Ｘｎから成る導体ループ群Ｘと、Ｙ軸
に平行な多数の細長い導体ループｙ１・・・・ｙｍから
成る導体ループ群ｙとを備えた’ｉＥ磁結合方式の座標
入力板９の背面に、ビデオプロジェクタのディスプレー
板に用いられるフレネルレンズ板１０が密着して設けら
れている。この座標入力板９は前述した特開昭５９−１
８６０７６号公報記載の座標人力装置の入力仮と同一の
構成であり、導体ループ群ｘ及びｙの各導体ループＸ１
・・・・Ｘｎ及びＹｓ・・・・Ｙｍに第３図のような搬
送周波数４５５ＫＨｚの多相バースト信号（９０Ｈｚ繰
返し）をｔＯ−１Ｉｓ ｔｌ 〜ｔ２の間に順次供給す
ると、すり硝子板６の上面にはＹ軸、Ｘ軸方向に移動す
る４５５Ｋ）１ｚの進行’ｇａ界が得られる。描画ペン
２にはこの進行′ｗｔ磁界に鎖交する４５５ＫＨｚの誘
動電圧を検出する導体コイルが設けられており、描画ペ
ン２を電子黒板１に当てたときこの導体コイルに誘導さ
れる４５５ＫＨｚ信号の検出タイミングを原点を示す時
刻と比較して描画ペン２の位置座標を求めることができ
る。FIG. 2 is a perspective view showing the configuration of an embodiment of the electronic whiteboard 1, which includes a ground glass plate 6, a transparent plastic plate 7 having a refractive index similar to that of glass, and a transparent glass plate 8, which constitute the drawing surface. , a conductor loop group X consisting of a large number of elongated conductor loops Xl... A Fresnel lens plate 10 used for a display plate of a video projector is provided in close contact with the rear surface of a coordinate input plate 9 of the 'iE magnetic coupling system, which is provided with a group of conductor loops y. This coordinate input board 9 is based on the above-mentioned Japanese Patent Application Laid-Open No. 59-1
It has the same configuration as the input temporary coordinate device described in Publication No. 86076, and each conductor loop X1 of the conductor loop groups x and y
When a polyphase burst signal (90 Hz repetition) with a carrier frequency of 455 KHz as shown in FIG. On the top surface, a 455K)1z traveling 'ga field moving in the Y-axis and X-axis directions is obtained. The drawing pen 2 is equipped with a conductive coil that detects a 455 KHz induced voltage interlinked with this traveling 'wt magnetic field, and when the drawing pen 2 is applied to the electronic blackboard 1, a 455 KHz signal induced in this conductive coil is detected. The position coordinates of the drawing pen 2 can be determined by comparing the detection timing with the time indicating the origin.
描画ペン２の検出信号は堆画ベンを電子黒板１に接触さ
せると回路が閉じて送出され、描画ペンを離すと回路が
切れて送出しないよう構成されている。The detection signal of the drawing pen 2 is configured so that when the drawing pen is brought into contact with the electronic blackboard 1, the circuit is closed and the signal is sent out, and when the drawing pen is released, the circuit is cut off and the signal is not sent out.
第４図は座標検出部３の一構成例を示すブロック図で、
制御回路１１からＸ軸、Ｙ軸走査回路１２ 、１２’を
経て第３図の多用バースト１ｇ号を座標入力板９の谷導
体ループに順次供給し、描画ペン２の検出１６号を４５
５ＫＨｚの同調増幅器１３で増幅したのち、同期検波器
１４で４５５Ｋ）ｉｚ（７）搬送波信号により同期検波
し、その出力をスライス回路１５を通してピーク検出回
路１６に加え、微分後ゼロクロス点を求めてピーク値の
発生時刻を検出し、クロックパルスな計数して位ｔ＃座
標を求めるように構成されている。この構成は前述の特
開昭５９−１８６０７６号公報記載の方法を改善した特
開昭５９−１２８７２８号明細誉記載の方法であり、そ
の動作の詳細については前記明細書を参照されたい。FIG. 4 is a block diagram showing an example of the configuration of the coordinate detection section 3.
The control circuit 11 sequentially supplies the frequent burst No. 1g shown in FIG.
After amplification with a 5KHz tuned amplifier 13, synchronous detection is performed using a 455K)iz(7) carrier signal with a synchronous detector 14, the output is applied to a peak detection circuit 16 through a slice circuit 15, and after differentiation, the zero crossing point is found and the peak is detected. It is configured to detect the time of occurrence of the value and count clock pulses to obtain the position t# coordinate. This configuration is a method described in Japanese Patent Application Laid-Open No. 59-128728, which is an improvement on the method described in Japanese Patent Application Laid-open No. 59-186076, and please refer to the above specification for details of its operation.
制御部５は座標検出部３で検出された描画ペンの位置座
標を記憶し、カラービデオプロジェクタ４に制御信号を
送出するほか、外部機器（ビデオプリンタや信号伝送用
の変復調装置）との１Ｎ号授受を行うように構成されて
いる。第１図に示すように本実施例の菟子黒板装ｒ１ｉ
ｔにはカラービデオプロジェクタが愛用されており、例
えば入力時に′鑞子黒板上の指定された場所に触れるこ
とにより色指定を行い、ａ数の色で表示させることが可
能である。なＪ６、図形を消去する場廿に（１同様な方
法で消去指示を行って（−画ペンで（ｉ示した領域内の
図形を消去するよ′）構＃：されている。The control unit 5 stores the position coordinates of the drawing pen detected by the coordinate detection unit 3, and sends control signals to the color video projector 4, as well as transmits 1N signals to external devices (video printer and signal transmission modem). It is configured to give and receive. As shown in FIG.
For example, color video projectors are commonly used by T, and for example, when inputting data, a color can be specified by touching a specified location on the blackboard, and the display can be made in a number of colors. J6, when erasing a figure, an instruction to erase is given in the same manner as in (1) (- erase the figure in the area indicated by i) using a drawing pen.
上述の構成によれば、遠隔地をこ二組の同様な電子黒板
装置を設置して電気１３号の伝送を行えば、Ａ地点の黒
板に記入した図形はＢ地点の黒板ｊこ・ム同時に表示さ
れ、Ｂ地点の黒板上でこれに加Ｊ修正を加えると直ちに
人地点の黒板にも表示されるので、遠隔地にあっても同
じ黒板の前で討論するのと同様にｆ用するＣとができる
。According to the above configuration, if two sets of similar electronic blackboard devices are installed in a remote location and electricity is transmitted, the figures written on the blackboard at point A will be displayed simultaneously on the blackboard at point B. If you make any additions or corrections to this on the blackboard at point B, it will immediately be displayed on the blackboard at person point, so even if you are in a remote location, you can use f in the same way as if you were discussing in front of the same blackboard. I can do that.
上述の実施例では座標入力板の導体ループに搬送周波数
のパース！’ １ｇ号を送出し、描画ペンの導体コイル
で鎖交磁界を検出するように説明したが、逆に堆−ペン
の導体コイルに搬送周波数の信号を入力し、座標入力・
仮の各導体ループなノ＠次切り替えて鎖交磁界を検出す
るようにしても同様な位置座標の検出ができる１、又、
上述の実施例では搬送周波数の検出信号を同調増幅した
後に同期構成し、検波出力のピークを求めて位置座標を
検出する方法を説明したが、この方法に限定されるもの
ではなく、例えば同期検波でなく包絡線構成を用いても
よく、同調増幅せずに検波出力の基本波成分をフィルタ
で抽出し、その位相を比較することによフて求めること
もできる。更に、搬送周波数のバースト信号を便用せず
、低周波のパルス１号を座標入力板に供給しても位置座
標の検出は可能である（前記特開昭５９−１８６０７６
号公報参照）。In the above embodiment, the carrier frequency is parsed in the conductor loop of the coordinate input board! ' 1g was sent out and the magnetic linkage field was detected by the conductor coil of the drawing pen, but conversely, the signal of the carrier frequency is input to the conductor coil of the drawing pen, and the coordinate input/
The same position coordinates can be detected even if the interlinkage magnetic field is detected by switching each temporary conductor loop.
In the above embodiment, a method was described in which the detection signal of the carrier frequency is synchronously amplified and then configured synchronously, and the position coordinates are detected by finding the peak of the detection output. However, the method is not limited to this method. For example, synchronous detection Instead, an envelope configuration may be used, and the fundamental wave component of the detection output can be extracted with a filter without tuned amplification, and the phase can be compared to obtain the amplitude. Furthermore, it is possible to detect position coordinates by supplying low-frequency pulse No. 1 to the coordinate input board without using a carrier frequency burst signal (as disclosed in Japanese Patent Application Laid-Open No. 186076/1983).
(see publication).
なお、上述の実施例ではカラービデオプロジェクタを１
史用しているが、カラーでなくモノクロームでも同様の
効果を得ることがでさ、直接投影型のビデオプロジェク
タでなく反射投影型のビデオプロジェクタを用いること
が可能なことは言うまでもない。Note that in the above embodiment, one color video projector is used.
Although it has been used in the past, it goes without saying that the same effect can be obtained with monochrome rather than color, and that it is also possible to use a reflective projection video projector instead of a direct projection video projector.
以上詳細に説明したように、本発明の電子黒板装置によ
れば、電子黒板の描画面とディスプレー面が同一である
ため、遠隔地においても相手の記入した図形等の位置が
容易に分かり、テレビ会議尋に匣用した場せ、あたかも
同じ黒板を用いているのと同様に別車修正を行いながら
討論でさるという効果がある。As explained above in detail, according to the electronic whiteboard device of the present invention, since the drawing surface of the electronic blackboard and the display surface are the same, it is easy to see the position of the figure drawn by the other party even in a remote location, and When used in a conference room, it has the effect of allowing the discussion to proceed as if the same blackboard was being used, with corrections being made on different wheels.
第１図は本発明の一実施例の構成を示す概念図、第２図
は第１図の電子黒板の一構成例を示す斜視図、第３図は
電子黒板に加えられるパースＢｑ号を示す説明図、第４
図は第１図の座標検出部の一実施例のブロック図である
。
１・・・・・・電子黒板、２・・・・・・描画ペン、３
・・・・・・座標検出部、４・・・・・・カラービデオ
プロジェクタ、５・・・・・・制御部、６・・・・・・
すり硝子板、７・・・・・・プラスチック板、８・・・
・・・透明硝子板、９・・−・・・座標人力板、１０・
・・・・・フレネルレンズ板、１１・・・・・・制御回
路、１２ 、１２’・・・・・・走査回路、１３・・・
・・・同調増幅器、１４・・・・・・同期検波器、１５
・・・・・・スライス回路、１６・・・・・・ピーク検
出回路。
代理人 弁理士 内 原 音
＄ ｌ 図
＄ ２ 回
ｉｏ７しネルしンス゛手穎FIG. 1 is a conceptual diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a perspective view showing an example of the configuration of the electronic blackboard in FIG. 1, and FIG. 3 shows a perspective Bq number added to the electronic blackboard. Explanatory diagram, 4th
This figure is a block diagram of one embodiment of the coordinate detection section of FIG. 1. 1...Electronic blackboard, 2...Drawing pen, 3
...Coordinate detection unit, 4...Color video projector, 5...Control unit, 6...
Frosted glass plate, 7...Plastic plate, 8...
...Transparent glass plate, 9...Coordinate manual board, 10.
...Fresnel lens plate, 11...control circuit, 12, 12'...scanning circuit, 13...
... Tuned amplifier, 14 ... Synchronous detector, 15
... Slice circuit, 16 ... Peak detection circuit. Agent Patent Attorney Uchihara Oto $ l Figure $ 2 io7 consultation procedure
Claims (3)
の一方に平行な細長い多数の導体ループから成る二組の
導体ループ群を備えた座標入力板の背面にビデオプロジ
ェクタ用のフレネルレンズ板を密着させた光散乱面を有
する電子黒板と、導体コイルを備え前記電子黒板の表面
に図形等を入力する描画ペンと、前記各導体ループを順
次選択して前記導体ループと前記導体コイル間の電磁結
合による誘導信号を検出し前記描画ペンの位置座標を求
める座標検出手段と、前記フレネルレンズ板に画像を投
影表示するビデオプロジェクタと、前記座標検出手段で
検出した前記描画ペンの位置座標の軌跡を記憶し前記ビ
デオプロジェクタを制御する制御手段とを備え、前記描
画ペンで描いた図形や文字が前記電子黒板上に表示され
るよう構成されたことを特徴とする電子黒板装置。(1) A Fresnel lens plate for a video projector is attached closely to the back of the coordinate input board, which is composed of a transparent insulating plate and has two sets of conductor loops each consisting of a large number of long and thin conductor loops parallel to one of the orthogonal coordinate axes. an electronic blackboard having a light-scattering surface; a drawing pen having a conductor coil for inputting figures etc. onto the surface of the electronic blackboard; and electromagnetic coupling between the conductor loops and the conductor coils by sequentially selecting each of the conductor loops. a coordinate detection means for detecting a guidance signal from the drawing pen to determine the position coordinates of the drawing pen; a video projector for projecting and displaying an image on the Fresnel lens plate; and storing a locus of the position coordinates of the drawing pen detected by the coordinate detection means. and control means for controlling the video projector, and is configured so that figures and characters drawn with the drawing pen are displayed on the electronic whiteboard.
プに搬送周波数のバースト電流を順次供給し、前記描画
ペンの導体コイルで検出された前記搬送周波数の誘導信
号を同調増幅したのち検波し、その検波出力のピーク値
の発生時刻から前記位置座標を検出することを特徴とす
る特許請求の範囲第１項記載の電子黒板装置。(2) The coordinate detection means sequentially supplies a burst current of a carrier frequency to each conductor loop of the coordinate input board, tunes and amplifies the induced signal of the carrier frequency detected by the conductor coil of the drawing pen, and then detects the induced signal. , the electronic whiteboard device according to claim 1, wherein the position coordinates are detected from the time of occurrence of the peak value of the detected output.
搬送周波数の電流を供給し、前記座標入力板の各導体ル
ープを順次切り替えて検出した前記搬送周波数の誘導信
号を同調増幅したのち検波し、その検波出力のピーク値
の発生時刻から前記位置座標を検出することを特徴とす
る特許請求の範囲第１項記載の電子黒板装置。(3) The coordinate detection means supplies a current at a carrier frequency to the conductor coil of the drawing pen, sequentially switches each conductor loop of the coordinate input board, and tunes and amplifies the detected induction signal at the carrier frequency, and then detects the detected signal. , the electronic whiteboard device according to claim 1, wherein the position coordinates are detected from the time of occurrence of the peak value of the detected output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60051980A JPS61211095A (en) | 1985-03-15 | 1985-03-15 | Electronic blackboard device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60051980A JPS61211095A (en) | 1985-03-15 | 1985-03-15 | Electronic blackboard device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61211095A true JPS61211095A (en) | 1986-09-19 |
Family
ID=12902007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60051980A Pending JPS61211095A (en) | 1985-03-15 | 1985-03-15 | Electronic blackboard device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61211095A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0212892U (en) * | 1988-07-08 | 1990-01-26 | ||
| JPH02158822A (en) * | 1988-12-13 | 1990-06-19 | Wacom Co Ltd | Picture input displaying device |
| JP2001021992A (en) * | 1999-07-09 | 2001-01-26 | C Media:Kk | Portable terminal, portable terminal system and portable telephone |
| JP2009192306A (en) * | 2008-02-13 | 2009-08-27 | Wacom Co Ltd | Position detecting device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5886630A (en) * | 1981-11-18 | 1983-05-24 | Agency Of Ind Science & Technol | Display for variable density graphic form |
| JPS6025045B2 (en) * | 1980-03-19 | 1985-06-15 | 製鉄化学工業株式会社 | Method for producing acrylic acid polymer with excellent salt water absorption ability |
-
1985
- 1985-03-15 JP JP60051980A patent/JPS61211095A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6025045B2 (en) * | 1980-03-19 | 1985-06-15 | 製鉄化学工業株式会社 | Method for producing acrylic acid polymer with excellent salt water absorption ability |
| JPS5886630A (en) * | 1981-11-18 | 1983-05-24 | Agency Of Ind Science & Technol | Display for variable density graphic form |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0212892U (en) * | 1988-07-08 | 1990-01-26 | ||
| JPH02158822A (en) * | 1988-12-13 | 1990-06-19 | Wacom Co Ltd | Picture input displaying device |
| JP2001021992A (en) * | 1999-07-09 | 2001-01-26 | C Media:Kk | Portable terminal, portable terminal system and portable telephone |
| JP2009192306A (en) * | 2008-02-13 | 2009-08-27 | Wacom Co Ltd | Position detecting device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5926168A (en) | Remote pointers for interactive televisions | |
| US4177354A (en) | Graphic communications apparatus | |
| KR0135985B1 (en) | Coordinate input device | |
| US5235363A (en) | Method and apparatus for interacting with a computer generated projected image | |
| JPH0210969B2 (en) | ||
| MY109780A (en) | Television receiver | |
| US3617630A (en) | Superimposed dynamic television display system | |
| JPS59266A (en) | Color information inputting system of electronic blackboard device | |
| JPS61211095A (en) | Electronic blackboard device | |
| CN215770296U (en) | Wisdom blackboard | |
| JPH08320755A (en) | Information processor | |
| EP0453568B1 (en) | Electronic blackboard apparatus | |
| JPH1031554A (en) | Data input device and information indication system | |
| JPH0137022B2 (en) | ||
| JPS617831A (en) | Overhead projector | |
| JPS60150119A (en) | Coordinate input device provided with display | |
| JPH04259022A (en) | Handwriting input device | |
| JPS59140483A (en) | Video projector apparatus | |
| JPS6133526A (en) | Discriminating method of drawing mode | |
| GB1296072A (en) | ||
| KR930015724A (en) | Curtain function control of video camera | |
| JPS6118389B2 (en) | ||
| JPH01257935A (en) | Overhead projector | |
| JPS6086907U (en) | Electron beam display device | |
| JPS60168081U (en) | Display device with multiple electronic cursors |