Pressure-sensitive pad and production thereof
First Claim
1. A writing pad comprising a pair of substrates each having an electrode formed on one of the surfaces, the pair of substrates being disposed in parallel in such a way that the electrodes face one another with a predetermined gap between the substrates by means of a plurality of insulating dot spacers,wherein a height (G) of the dot spacers is not greater than 15 μ
- m, a diameter (d) of the dot spacers on the electrode surface to which the dot spacers are fixed is d>
G, and an average center distance (L) between the adjacent dot spacers is not greater than 100 μ
m and 3 d<
L<
100 d,and further wherein, when the tip of an input pen for depressing either of the substrate has a radius of curvature (R μ
m), the average center distances (L) of the dot spacers satisfy the following relationship;
space="preserve" listing-type="equation">L≦
R/nwherein n is a positive integer of 4 or greater.
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Accused Products
Abstract
A writing pad having a construction wherein two substrates each having electrodes formed on one of the surfaces are disposed in parallel in such a way that their electrodes face one another with a predetermined gap between them. The gap is defined by insulating dot spacers fixed at regular intervals to at least one of the electrode surfaces. The height G of the dot spacers is smaller than 15 μm, the average center distance L between the adjacent dot spacers is smaller than 100 μm, d>G and 3 d<L<100 d (where d is a diameter of the dot spacers on the electrode surface to which the dot spacers are fixed). According to this writing pad, when characters or graphics are inputted to the input substrate of the writing pad by an input pen, an erroneous input does not occur even when fingers, etc., erroneously come into contact with the input substrate, and the erroneous operation does not occur, either, when the input operation is repeated many times by the input pen.
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Citations
8 Claims
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1. A writing pad comprising a pair of substrates each having an electrode formed on one of the surfaces, the pair of substrates being disposed in parallel in such a way that the electrodes face one another with a predetermined gap between the substrates by means of a plurality of insulating dot spacers,
wherein a height (G) of the dot spacers is not greater than 15 μ - m, a diameter (d) of the dot spacers on the electrode surface to which the dot spacers are fixed is d>
G, and an average center distance (L) between the adjacent dot spacers is not greater than 100 μ
m and 3 d<
L<
100 d,and further wherein, when the tip of an input pen for depressing either of the substrate has a radius of curvature (R μ
m), the average center distances (L) of the dot spacers satisfy the following relationship;
space="preserve" listing-type="equation">L≦
R/nwherein n is a positive integer of 4 or greater. - View Dependent Claims (2, 8)
- m, a diameter (d) of the dot spacers on the electrode surface to which the dot spacers are fixed is d>
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3. A writing pad comprising a pair of substrates each having an electrode formed on one of the surfaces, the pair of substrates being disposed in parallel in such a way that the electrodes face one another with a predetermined gap between the substrates by means of a plurality of insulating dot spacers,
wherein a height (G) of the dot spacers is not greater than 15 μ - m, a diameter (d) of the dot spacers on the electrode surface to which the dot spacers are fixed is d>
G, and an average center distance (L) between the adjacent dot spacers is not greater than 100 μ
m and 3 d<
L<
100 d and further,wherein at least one of the pair of electrode surfaces is treated with an insulating chain organic polymeric compound having a functional group capable of binding with a material composing the electrode. - View Dependent Claims (4)
- m, a diameter (d) of the dot spacers on the electrode surface to which the dot spacers are fixed is d>
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5. A process for producing a writing pad comprising a pair of substrates each having an electrode formed on one of the surfaces, the pair of substrates being disposed in parallel in such a way that the electrodes face one another with a predetermined gap between the substrates imposed by a plurality of insulating dot spacers,
which comprises a step of forming droplets of a spacer forming solution comprising an organic solvent and, dissolved or dispersed therein, a nonconductive resin on a preheated electrode surface, and evaporating the organic solvent from the droplets to form insulating dot spacers on the electrode surface, wherein a height (G) of the dot spacers is not greater than 15 μ - m, a diameter (d) of the dot spacers on the electrode surface is greater than G (d>
G), and an average center distance (L) between the adjacent dot spacers is not greater than 100 μ
m and 3 d<
L<
100 d. - View Dependent Claims (6, 7)
- m, a diameter (d) of the dot spacers on the electrode surface is greater than G (d>
Specification