JPH0556201A - Electronic blackboard - Google Patents

Abstract

PURPOSE:To obtain an excellent printout by providing an electrostatic attraction equipment on a plotting surface. CONSTITUTION:In an electrostatic attraction equipment A to be applied to a plotting surface 1, the top face of a synthetic resin sheet material 11 serving as a dielectric layer is plotted on the surface 1 with a marker 2 and electrodes 12 to 15 integrally formed on the back face of the sheet material, 11 by means of printing are connected to a DC power supply 16. The sheet material. 11 is composed of a transparent synthetic resin, its surface is formed in printing with a surface processing layer 18 to improve a mat effect, durability and smoothness, and its surface side is formed in printing with a surface design layer 19. By applying voltage to the electrodes 12 to 15 by the power supply 16, electric charge having a different polarity from the electrodes 12 to 15 is generated from electrostatic induction at respective sections opposite to the electrodes 12 to 15 on an attraction sheet material 17 mounted on the sheet material 11, which results in an effect of electrostatic attraction force between the charges having different polarity from each other. At this time, by mounting the sheet material 17 serving as an original on the sheet material 11, the sheet material 17 is attracted and held by the sheet material 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic blackboard which attracts a sheet material by an electrostatic attraction device.

[0002]

2. Description of the Related Art An electronic blackboard proposed hitherto is capable of drawing with a water-based ink on a drawing surface and copying the drawn contents. On these electronic blackboards, characters and figures may be directly drawn with a marker pen made of water-based ink, or a sheet material may be attached to the surface of the paper, and characters or figures may be drawn on the paper by a pen made of water-based or oil-based ink. In this case, a magnet or an adhesive tape has been used to attach the sheet material to the electronic blackboard.

[0003]

However, it takes a lot of time to stick the paper on the electronic blackboard by means such as a magnet, and since the paper is not fixed on the entire surface of the electronic blackboard, the paper may be displaced or swelled by wrinkles. There are some places where you can do things, and sometimes you can't fix them satisfactorily. Further, when a magnet is provided on the electronic blackboard, there is a problem in that the magnet portion appears in black at the time of printing and the appearance is not good.

The present invention has been made in view of the above circumstances, and provides an electronic blackboard having a suction function, which can sufficiently exert the function of the electronic blackboard and can fix the sheet material flatly on the entire surface. With the goal.

[0005]

In order to solve such a problem, an electronic blackboard according to claim 1 is an electronic blackboard for printing out contents drawn on a drawing surface, wherein an electrostatic adsorption device is provided on the drawing surface. It is characterized by having.

In the electronic blackboard according to a second aspect of the present invention, the electrostatic attraction device has a DC power source connected to the back side of the synthetic resin sheet material as the dielectric layer, and the electrode groups in which the positive and negative electrodes are alternately arranged are conductive. It is characterized in that it is formed by printing with a volatile ink.

The electronic blackboard according to claim 3 is characterized in that the synthetic resin sheet material as the dielectric layer is subjected to surface modification treatment by a corona discharge treatment method or the like to improve printability.

An electronic blackboard according to a fourth aspect is characterized in that a surface treatment layer for improving durability and the like is printed on the surface side of a synthetic resin sheet material as a dielectric layer.

In the electronic blackboard according to a fifth aspect of the present invention, the synthetic resin sheet material as the dielectric layer is a transparent synthetic resin sheet material, and an electrode group and a surface design layer for enhancing the appearance are superposed on the back surface side thereof. It is characterized in that it is formed by printing.

[0010]

According to the above construction, the original placed on the drawing surface is electrostatically adsorbed and securely held.

[0011]

FIG. 1 is a perspective view of an electronic blackboard showing an embodiment of the present invention. In FIG. 1, a symbol 1 is a drawing surface, and a marker 2 and a blackboard eraser 3 are accommodated below the drawing surface in an accommodation portion slightly larger than their size. Further, the drawing surface 1 is normally stopped at the left end or the right end (in this example, the left end) of the drawing surface 1, and when the information drawn on the drawing surface 1 is taken in, the drawing surface 1 is moved from one end to the other end. A scanner 4 is provided. The scanner 4 is longer than the length of the drawing surface 1 in the vertical direction. When the scanner 4 is moved, the surface opposite to the drawing surface 1 is moved so as to be almost in contact with the drawing surface 1 and is drawn on the drawing surface 1. I will take in the information. When the information acquisition is completed, printing is performed by the printer 5 provided on the lower back side.

FIG. 2 is a side view showing the construction of an embodiment of the electrostatic attraction device A applied to the drawing surface 1 of the electronic blackboard shown in FIG. 1, which is applied to the entire drawing surface 1. , Here are some of them. Reference numeral 11 is a synthetic resin sheet material as a dielectric layer, and in this figure, the upper side is used as a surface for drawing with the marker 2 on the drawing surface 1. The synthetic resin sealing material 11 is composed of electrode groups 12 to 15 in which positive electrodes and negative electrodes are alternately provided on the back side by printing. The electrode groups 12 to 15 are connected to the DC power supply 16. Reference numeral 17 is a sheet material that is attracted to the drawing surface.

The electrostatic adsorption device A also functions as a surface sheet that can be drawn. Therefore, the synthetic resin sheet material 11 as the dielectric layer of the electrostatic attraction device A is a transparent synthetic resin sheet material, and the surface treatment layer 18 is formed by printing on the surface of the synthetic resin sheet material 11 to provide a matte effect, durability, and slipperiness. Etc., and the surface design layer 19 is formed by printing on the surface side to improve the appearance aesthetics. In this way, when the surface design layer 19 is printed on the back surface side of the synthetic resin sheet material 11, the electrode groups 12 to 15 are printed on the surface design layer 19 surface.

The synthetic resin sheet material 11 as the dielectric layer has a good dielectric property (dielectric constant 7 to 12, volume specific resistance 1).
PVF (polyvinyl fluoride) or PVDF (polyvinylidene fluoride) of 0 ^{13 to} 10 ¹⁵ Ω · cm is used. PVF or PVDF as this dielectric layer
Since the printing ink has poor adhesion to the printing ink and printing is difficult, the surface is subjected to a surface modification treatment by a corona discharge treatment method to be in a roughened state.

In this way, the electrode groups 12 to 15 connected to the DC power supply 16 are printed and formed on the rear surface of the synthetic resin sheet material 11 whose surface has been roughened and whose printability has been improved, using conductive ink. ITO, Ag, carbon black or the like is used for the conductive ink forming the electrode groups 12 to 15. A fluorine-based synthetic resin is mixed in the conductive ink in order to improve printability.

As shown in FIG. 3, the electrode groups 12 to 15 formed by printing with the conductive ink have comb-teeth-shaped positive electrodes 13, 15, ... And negative electrodes 12, 14 ,.
And are arranged in a meshed state to form an electrode pattern in which positive electrodes and negative electrodes are alternately arranged. Such an electrode pattern is formed over the entire surface of the synthetic resin sheet material 11.

In this apparatus, a sheet material 17 is placed at a predetermined position on a dielectric layer made of synthetic resin sheet material 11. Next, a voltage of about several kV is applied by the DC power supply 16 to the electrode group 1
When applied to Nos. 2 to 15, electric charges having a polarity different from those of the electrode groups 12 to 15 are generated by electrostatic induction at the portion of the sheet material 17 placed on the synthetic resin sheet material 11 facing the electrode groups 12 to 15. The electrostatic attraction force is generated between both charges (+, −) having different polarities. At this time, when the sheet material 17 as a document is placed on the synthetic resin sheet material 11, the sheet material 17
Is adsorbed and held on the synthetic resin sheet material 11 by electrostatic attraction. During this operation, since the electrode groups 12 to 15 are in close contact with the synthetic resin layer 11, the electrostatic attraction force does not decrease.

Further, when the voltage applied to the electrode groups 12 to 15 is removed by turning off the DC power source 16, the charges generated in the electrode groups 12 to 15 are discharged through the synthetic resin sheet material 11. The electrostatic attraction is attenuated by this discharge action, and the suction holding state of the sheet material 17 on the synthetic resin sheet material 11 is released. During this operation, the electrode groups 12 to 15 are in close contact with the dielectric layer, so that the discharge action of the residual charge is effectively promoted. Therefore, the residual charges do not hinder the generation of charges of opposite polarity when the revoltage is applied.

FIG. 4 is a diagram showing a manufacturing process of the electrostatic adsorption device A. First, the synthetic resin sheet material (PVF or PVDF) 11 as a dielectric layer is subjected to surface modification treatment by a corona discharge treatment method or the like (step S1). next,
Fluorine-based ink is mixed in the printing ink (surface treatment ink) to form the surface treatment layer (step S2), and the surface treatment layer is printed on the surface side of the synthetic resin sheet material as the dielectric layer with this printing ink. It is formed (step S3). Next, a fluorine-based ink is mixed into the printing ink (surface design ink) to form the surface design layer (step S4), and the surface design is performed on the back surface side of the synthetic resin sheet material 11 as a dielectric layer with this printing ink. A layer is formed by printing (step S5). Next, a fluorine-based ink is mixed in the printing ink (conductive ink) for forming the electrode groups 12 to 15 (step 6), and the electrode groups (electrode patterns) 12 to 15 are formed on the surface design layer with this printing ink. Is formed by printing (step S7), and the production of the electrostatic adsorption device A is completed (step S8).

Further, such an electrostatic adsorption device A is attached and fixed on an insulating sheet material of an electronic blackboard with an adhesive such as an epoxy resin to be assembled (step S9).

FIG. 5 shows an operating procedure of the electronic blackboard provided with the electrostatic attraction device A. First, the power of the electronic blackboard is turned on (step 20). Next, the adsorption switch of the electrostatic adsorption device A is turned on (step S21), a voltage is applied to the electrode groups 12 to 15 by the DC power supply 16, and the sheet material 17 is placed on the synthetic resin sheet material 11 as a dielectric layer. Adsorption and fixation (step S22) In this state, drawing is performed using the marker (step S23), and after the drawing is completed, printing is performed (step S24). Next, the adsorption switch of the electrostatic adsorption device A is turned off (step S25), the adsorption of the sheet material 17 is released (step S26), and the sheet material 17 is removed from the electrostatic adsorption device A (step S27).

[0022]

As described above, since the electronic blackboard of the present invention is provided with the electrostatic adsorption device on the drawing surface, the paper is fixed so that it does not take time and can be fixed on the entire surface, so that the paper is displaced or wrinkled. It has the effect of producing a clean printout without bulging.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of an electronic blackboard to which the present invention has been applied.

FIG. 2 is a cross-sectional view showing a configuration of an electrostatic attraction device.

FIG. 3 is a diagram showing a detailed configuration of an electrode group in FIG.

FIG. 4 is a flowchart showing a manufacturing process of the electrostatic attraction device.

FIG. 5 is a flowchart showing an operation procedure of the electronic blackboard.

[Explanation of symbols] 1 Drawing surface 2 Marker 3 Blackboard eraser 4 Scanner 11 Synthetic resin sheet material 12 to 15 Electrode group 16 DC power supply 17 Sheet material

Claims (5)

[Claims] 1. An electronic blackboard for printing out the contents drawn on a drawing surface, wherein the drawing surface is provided with an electrostatic adsorption device. 2. In the electrostatic attraction device, a DC power source is connected to the back surface side of a synthetic resin sheet material as a dielectric layer, and an electrode group in which positive and negative electrodes are alternately arranged is formed by printing with conductive ink. The electronic blackboard according to claim 1, wherein: 3. The electronic blackboard according to claim 1, wherein the synthetic resin sheet material as the dielectric layer is subjected to surface modification treatment by a corona discharge treatment method or the like to improve printability. 4. The electronic blackboard according to claim 1, wherein a surface treatment layer for improving durability and the like is formed by printing on the surface side of the synthetic resin sheet material as the dielectric layer. 5. The synthetic resin sheet material as the dielectric layer is a transparent synthetic resin sheet material, and the electrode group and the surface design layer for enhancing the appearance are printed and formed on the back surface side thereof. The electronic blackboard according to claim 1, which is characterized in that.