TOUCH PANEL
A touch panel that sandwiches a light transmitting piezoelectric material, which generates a voltage by a pressing force, between an upper conductive layer formed on a bottom face of an upper substrate and a lower conductive layer formed on a top face of a lower substrate. Since there is no space between the upper conductive layer and the lower conductive layer, reflection of external light can be reduced. This achieves good viewability. In addition, the touch panel can be easily manufactureable just by sequentially superimposing and attaching components
1 . A touch panel comprising:
a light transmitting upper substrate where an upper conductive layer is formed on its bottom face;
a light transmitting lower substrate where a lower conductive layer is formed on its top face; and
a light transmitting piezoelectric material in which a voltage is generated in a thickness direction by a pressing force,
wherein the light transmitting piezoelectric material is sandwiched between the upper conductive layer and the lower conductive layer.
2 . The touch panel of claim 1 , wherein the light transmitting piezoelectric material is made of polyvinylidene-fluoride.
3 . A manufacturing method of a touch panel, comprising:
giving piezoelectricity in a thickness direction to a polyvinylidene-fluoride film by applying an electric field to top and bottom faces of the film while stretching the film;
fabricating a sheet of piezoelectric material by cutting the polyvinylidene-fluoride film to which piezoelectricity is given;
forming a thin film of one of indium tin oxide and tin oxide on one of a polyethylene terephthalate film, polycarbonate film, and glass;
fabricating a upper substrate and a lower substrate by cutting one of the indium tin oxide and tin oxide on one of a polyethylene terephthalate film, polycarbonate film, and glass, forming an upper conductive layer on the top substrate, and forming a lower conductive layer on the bottom substrate; and
holding the piezoelectric material by sandwiching the piezoelectric material between the upper conductive layer and the lower conductive layer.