JPH0695596A - Electrostatic notice device - Google Patents

Abstract

PURPOSE:To provide an electrostatic notice device capable of writing letters on the surface of an attracted article while holding sufficient attraction holding force against the attracted article. CONSTITUTION:This device is provided with a hard coat material layer 5 on the surface of an attraction layer 2 consisting of dielectrics in layers and a pair of positive and negative sinking comb type electrodes 3 on the back of the attraction layer 2, and it is constituted to attract and hold attracted articles such as a paper sheet and others on the surface of this hard coat material layer 5 by Coulomb's force. The hard coat material layer 5 is formed by applying a coating material of, for example, acrylic urethane on the attraction layer 2 and hardening it by radiation of ultraviolet rays, and its volume sensitivity is made 10<10>OMEGA.cm or more and its thickness 50mu or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic bulletin board device for adsorbing and holding an object to be adsorbed by Coulomb force. The present invention relates to an electrostatic bulletin board device capable of performing.

[0002]

2. Description of the Related Art Conventionally, as an electrostatic bulletin board device for adsorbing and holding an object to be adsorbed such as a sheet by Coulomb force, an adsorbing layer made of a layered dielectric material and an electrically separating layer on the back surface side of the adsorbing layer are provided. A structure having a pair of electrodes provided in a laminated shape is known. In this conventional electrostatic bulletin board device, a pair of electrodes are connected to a DC power source to utilize the Coulomb force to adsorb and hold an adsorbed substance on the surface side of the adsorption layer.

[0003]

By the way, the electrostatic bulletin board device as described above has a so-called white function in addition to the original function of the adsorbing device for adsorbing and holding an object to be adsorbed, such as a sheet-like adsorbate material, on the display surface. If a writing tool such as a marking pen (marker) such as a board can be used to write characters on the display surface, convenience is greatly improved. In this way, it is conceivable to provide another layer on the surface of the adsorption layer in which characters can be written so that the electrostatic bulletin board device has both the adsorption function and the character writing function. However, if another surface layer is simply provided on the surface of the adsorption layer, when the electrode is connected to the power supply, the electrode becomes electrically conductive inside the surface layer, and the polarization charge for adsorbing and holding the object to be adsorbed. There is a problem that an electric field such as inducing a magnetic field is not effectively generated, or the surface layer thereof causes an electret phenomenon and the adsorption force is lost.

The present invention has been made in view of the above-mentioned problems, and it is possible to write characters on the display surface while maintaining a sufficient suction holding force by the Coulomb force with respect to the object to be attracted. The purpose is to provide an electronic bulletin board device.

[0005]

In order to achieve the above-mentioned object, an electrostatic bulletin board device according to the present invention comprises: (a) an adsorption layer made of a layered dielectric material; (b) one side of this adsorption layer. And a hard coat material layer having a volume resistivity of 10 ¹⁰ Ω · cm or more and having a predetermined surface hardness, and (c) provided on the other surface side of the adsorption layer electrically separated from each other and laminated. At least a pair of electrodes that generate an electric field that induces polarization charge in the adsorption layer is provided, and an object to be adsorbed disposed on one surface side of the adsorption layer via the hard coat material layer is adsorbed and held by Coulomb force. It is characterized by that.

When forming the hard coat material layer,
It may be performed by adhering an acrylic / urethane resin or a polyester resin to one side of the adsorption layer and curing it by irradiating with ultraviolet light, or by adhering the methacrylic resin to one side of the adsorption layer and curing by thermal reaction. Alternatively, an acrylic resin or a urethane resin may be adhered to one side of the adsorption layer to be cured, or a fluorine-based enamel resin may be baked on the one side of the adsorption layer. Further, in these cases, the thickness of the hard coat material layer is preferably 50 μm or less, and may be composed of one layer or two or more layers. The surface hardness of this hard coat material layer is preferably 3H or more.

Further, the adsorption layer is made of plastics, for example, one or more conductive materials selected from gold, silver, tin, zinc oxide, conductive oxides, conductive ionic resins, and carbon black. It is preferable to disperse the finely divided particles, and in this case, the volume resistivity of the adsorption layer is preferably set to 10 ¹¹ to 10 ¹⁴ Ω · cm.

It is preferable that an insulating layer is provided on the back side of the pair of electrodes with respect to the adsorption layer. In this case, the insulating layer is preferably made of an insulating adhesive, and its insulating property preferably has a volume resistivity of 10 ¹⁴ Ω · cm or more.

[0009]

In the electrostatic bulletin board device of the present invention, a pair of hard coat material layers having a predetermined surface hardness of 10 ¹⁰ Ω · cm or more in volume resistivity is provided on one surface side of the adsorption layer. The electric field generated by the application of DC voltage between the electrodes induces the polarization charge in the adsorption layer and the hard coat material layer macroscopically. In addition, it is possible to write characters on the surface of the hard coat material layer.

In this case, the hard coat material layer has a thickness of 50 μm or less, and the hard coat material layer is made of acrylic.
When a urethane resin is formed by a method of adhering it to the surface of the adsorption layer by coating, coating, screen printing, etc. and curing it by UV irradiation, etc., a coating film with a desired resistance value, high hardness and excellent scratch resistance is obtained. It becomes possible.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the electrostatic notice board according to the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of an electrostatic bulletin board device according to an embodiment of the present invention. A partial plan view, a partial cross-sectional view and a perspective view showing an example of a state of use of the electrostatic bulletin board device are shown. Are shown in FIGS. 2, 3 and 4, respectively.

The electrostatic bulletin board device 1 of the present embodiment has an adsorption layer 2
And a pair of positive and negative comb-teeth-shaped electrodes 3, 3 provided on the back surface side of the adsorption layer 2 and an insulating adhesive provided on the back surface side of the comb-teeth electrodes 3, 3 with respect to the adsorption layer 2. Layer 4
It has and. Then, a single hard coat material layer 5 is provided on the surface of the adsorption layer 2, and the hard coat material layer 5 is provided.
The adsorbent 6 such as a paper sheet is adsorbed and held by the Coulomb force on the surface side of the adsorption layer 2 via.

The adsorption layer 2 is made of plastics such as polyester, polyvinyl chloride, acrylic, polycarbonate, polyacetal, phenol, epoxy, and gold,
Metal particles such as silver and tin, conductive materials such as zinc oxide, conductive oxides, and finely divided conductive ion resins are dispersed, and the thickness is 0.5 to 0.1 mm and the volume is 0.5 mm. The resistivity is 10 ¹¹ to 10 ¹⁴ Ω · cm.

As shown in FIGS. 1 and 2, the pair of comb-teeth-shaped electrodes 3 are formed by interposing the comb-teeth portions facing each other, and each end of the pair of comb-teeth-shaped electrodes 3 is switched to the DC power supply 7. Is configured to be connected via. When the changeover switch 8 is operated, the pair of comb-teeth-shaped electrodes 3
The polarity of can be switched. This changeover switch 8
This operation is performed when the object 6 to be adsorbed is adsorbed for a long period of time, and this operation prevents the adsorption force of the adsorption layer 2 and the like from being lowered due to the electret phenomenon. The adhesive layer 4 is composed of a material having a high volume resistivity of 10 ¹⁴ Ω · cm or more and high insulation.

On the other hand, the hard coat material layer 5 is formed by coating an acrylic urethane resin on the surface of the adsorption layer 2, coater,
It is formed by applying it by screen printing or the like and curing it by irradiating with ultraviolet rays.

The electrostatic bulletin board device 1 having such a configuration
Is attached to a rectangular support frame 9 as shown in FIG. 4 with the adhesive layer 4 side facing inward, and the support frame 9 is set on a stand 10 for use. Further, instead of using the stand 10 as described above, the stand 10 can be used by being fixed to or suspended from a wall surface by a mounting bracket or the like. A reference numeral 11 in FIG. 4 denotes a power supply box, and the power supply box 11 is provided with a power-on switch (not shown) and the changeover switch 8 described above.

In this embodiment, the surface of the adsorption layer 2 is provided.
The volume resistivity of the hard coat material layer 5 is
10 regardless of product resistivity^TenΩ · cm or more, preferably
10 ^Ten-10¹³Ω · cm and its thickness is 50μ
Below (10 g / m²Below). Such a value
Setting the volume resistivity and thickness of the hard coat material layer 5
And a macroscopic absorption by the electric field generated by the application of voltage.
The polarization charge is sufficient across the adhesion layer 2 and the hard coat material layer 5.
Will be induced, and the material to be adsorbed 6 will be sufficiently absorbed.
It will be possible to exert strength. In addition, hard coat
The volume resistivity of the material layer 5 is 10^TenIf less than Ω · cm
Energizes inside the hard coat material layer 5 when the power is turned on.
Therefore, the polarization charge is not induced. On the other hand, 10¹³Ω
・ If it is larger than cm, it is large in the hard coat material layer 5.
To the object to be adsorbed 6 by causing such an electret phenomenon.
You may not be able to exert the necessary force, but in this case,
To operate the replacement switch 8 to prevent a decrease in the suction force
Therefore, it is possible to obtain a product that can be sufficiently used.

According to the electrostatic bulletin board device of this embodiment, since the surface of the adsorption layer 2 is white or light gray, characters or the like are printed on the surface by using a marking pen (marker) for a white board (whiteboard). Can be drawn, and in this case, the written characters and the like can be clearly highlighted.

Further, when the above-mentioned acrylic / urethane UV-curing type is used as the hard coat material, the surface hardness becomes 3H or more, so that the surface may be scratched even if a hard writing instrument is used. It is possible to obtain sufficient scratch resistance and durability. On the other hand, for example, epoxy-based paints have high resistance when cured, and PVC / soft types have suitable resistance, but have a problem with surface hardness, while hard-types have too high a resistance. There is. The surface quality of the hard coat material layer 5 according to this embodiment is JIS S 6052 in terms of appearance, color, ease of sticking and dropping of markers, surface roughness, and the like.
It was confirmed that the quality is equivalent to the quality of the white plate surface specified in (Enamel white plate).

[0021]

[Table 1]

Table 1 shows the volume resistivity and absorption of the hard coat material layer.
An example of the result of the correlation test with the wearing power is shown. This
The test was conducted under the conditions of temperature 23 ° C and humidity 67%.
Fine material 90 as an adsorbed substance on the surface of the hard coat material layer 5
2000 with power supply 7 with paper (A4 size) attached
Applying a DC voltage of V, and 10 seconds after applying the voltage
Measures the attractive force (kg) by pulling only with a spring
It was done. In addition, in the table, used in this example
Hard coat material has a volume resistivity of 4.7 x 10 ¹¹Ω ・ c
m and thickness of 50μ (acrylic / urethane type hard
Coating material), on the other hand, the hard coating of Comparative Example 1
The material has a volume resistivity of 2.3 × 10¹⁵Ω · cm with a thickness of 5
0 μ (polyester hard coat material).
Comparative Example 2 is made of aluminum, copper, stainless steel having a thickness of 20μ.
Metal-based solder by vapor deposition or sputtering
Coating material (volume resistivity 10^-Four) Is used,
Comparative Example 3 is shown without the hard coat material.
ing. Also, in the table, "straight" refers to the electrode
When the polarity of the applied voltage is not changed, it is called "switching" again.
This is the case when the polarity of the applied voltage is changed every predetermined time.
Show each. Furthermore, "no residue" means that the voltage
Static charge generated in the hard coat material layer when the application is stopped
Indicates that has disappeared.

According to the test results, when the volume resistivity of the hard coat material is set to the order of 10 ¹¹ Ω · cm as in this embodiment, the adsorption force is so large between “straight” and “switching”. Although there is no difference, when set to the order of 10 ¹⁵ Ω · cm as in Comparative Example 1,
It can be seen that the value of “straight” is smaller than that of “switch”, and the hard coat material layer 5 causes the electret phenomenon.

In this embodiment, the hard coat material layer 5
However, the thickness is not necessarily limited to 50 μm or less, and can be appropriately set according to the thickness of the adsorption layer 2.

In this embodiment, the adsorption layer 2 has a structure in which a fine material such as metal pieces or zinc oxide is dispersed in plastics such as polyvinyl chloride resin. The constitution can also be one in which carbon black is dispersed in a resin. When carbon black is used, the electrostatic bulletin board device exhibits a black color as a whole, and therefore a white writing instrument is used when writing characters.

In this embodiment, the hard coat material layer was formed by adhering an acrylic urethane resin on the surface of the adsorption layer and curing it by irradiation of ultraviolet rays. Of resin cured by UV irradiation, methacrylic resin coated to a thickness of several microns, and cured by heat reaction It can also be formed by baking or the like. Both methods depend on the drying temperature that does not affect the plastics substrate of the adsorption layer, the adhesion to the substrate, the crack resistance according to the stretchability of the plastics, and the effect of the marking pen after painting. It is necessary to select the method and type that are suitable for chemical resistance and stain resistance.

As described above, it is obvious that the present invention can be modified in various ways. Such modifications are within the spirit and scope of the invention and all such variations and modifications apparent to those skilled in the art are intended to be within the scope of the following claims.

[0028]

EFFECTS OF THE INVENTION According to the electrostatic bulletin board of the present invention, it is possible to maintain a sufficient attraction force for an object to be attracted and to write characters on the surface by using a writing instrument such as a marking pen. Therefore, it is possible to obtain an electrostatic bulletin board device with improved convenience.

In this case, the hard coat material layer has a thickness of 50 μm or less, and the hard coat material layer is made of acrylic.
When the urethane resin is formed by adhering it to the surface of the adsorption layer and curing it by irradiating with ultraviolet rays, a coating film having a desired resistance value, high hardness and excellent scratch resistance can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view illustrating an embodiment of an electrostatic bulletin board device according to the present invention.

FIG. 2 is a partial plan view for explaining an embodiment of the electrostatic bulletin board device according to the present invention.

FIG. 3 is a partial cross-sectional view illustrating an embodiment of the electrostatic bulletin board device according to the present invention.

FIG. 4 is a perspective view showing a state of use for explaining an embodiment of the electrostatic bulletin board device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrostatic bulletin board device 2 Adsorption layer 3 Electrode 4 Adhesive layer 5 Hard coat material layer 6 Object to be adsorbed

Claims (18)

[Claims] 1. An adsorption layer comprising (a) a layered dielectric material,
(B) a hard coat material layer provided on one surface side of the adsorption layer so as to cover the one surface side, and having a volume resistivity of 10 ¹⁰ Ω · cm or more and a predetermined surface hardness; and (c) the adsorption. On the other surface side of the layer, at least one pair of electrodes, which are electrically separated from each other and are laminated, are provided to induce polarization charges in the adsorption layer to generate an electric field. An electrostatic bulletin board device, wherein an object to be adsorbed via a hard coat material layer is adsorbed and held by Coulomb force. 2. The volume resistivity of the adsorption layer is 10 ¹¹ -1.
The electrostatic bulletin board device according to claim 1, which is 0 ¹⁴ Ω · cm. 3. The electrostatic bulletin board device according to claim 1, wherein the adsorption layer is made of plastics. 4. The plastic material is a finely divided conductive material dispersed therein.
The electrostatic notice device described in. 5. The conductive material is one or more selected from gold, silver, tin, zinc oxide, conductive oxides, and conductive ionic resins. Item 4. The electrostatic bulletin board device according to item 4. 6. The electrostatic bulletin board device according to claim 4, wherein the conductive material is carbon black. 7. The hard coat material layer is one layer or two layers.
The electrostatic bulletin board device according to claim 1, wherein the electrostatic bulletin board is composed of more than one layer. 8. The surface hardness of the hard coat material layer is 3H.
The electrostatic bulletin board device according to claim 7, which is the above. 9. The electrostatic bulletin board device according to claim 7, wherein the hard coat material layer is formed by adhering an acrylic urethane resin on the surface of the adsorption layer and curing the same by ultraviolet irradiation. . 10. The electrostatic bulletin board device according to claim 7, wherein the hard coat material layer is formed by adhering a polyester resin to the surface of the adsorption layer and curing the same by irradiating ultraviolet rays. 11. The electrostatic bulletin board device according to claim 7, wherein the hard coat material layer is formed by adhering a methacrylic resin to the surface of the adsorption layer and thermally curing it. 12. The electrostatic bulletin board device according to claim 7, wherein the hard coat material layer is formed by adhering an acrylic resin to the surface of the adsorption layer and curing the acrylic resin. 13. The electrostatic notice board device according to claim 7, wherein the hard coat material layer is formed by adhering a urethane resin to a surface of the adsorption layer and curing the urethane resin. 14. The electrostatic bulletin board device according to claim 7, wherein the hard coat material layer is formed by baking a fluorine-based enamel resin on the surface of the adsorption layer. 15. The hard coat material layer has a thickness of 50.
The electrostatic bulletin board device according to claim 1, wherein the electrostatic bulletin board is set to μ or less. 16. The insulating layer is provided on the back side of the pair of electrodes with respect to the adsorption layer.
The electrostatic notice device described in. 17. The electrostatic bulletin board device according to claim 16, wherein the insulating layer is made of an insulating adhesive. 18. The electrostatic bulletin board device according to claim 16, wherein the insulating layer has a volume resistivity of 10 ¹⁴ Ω · cm or more.