CAPACITANCE TOUCH PANEL

摘要

A capacitance touch panel of the invention includes a display, a lower adhesive layer, a capacitance touch panel sensor, an upper adhesive layer and a protective substrate, which are formed in this order. Relative permittivity A in the upper adhesive layer and relative permittivity B in the lower adhesive layer satisfy expression (1): [relative permittivity A≧relative permittivity B . . . (1)] at respective temperatures set in increments of 20° C. from −40° C. to 80° C., and a temperature dependency of the relative permittivity B in the lower adhesive layer as determined by a temperature dependency evaluation test is up to 30%.

主权项

1. A capacitance touch panel comprising: a display; a lower adhesive layer; a capacitance touch panel sensor; an upper adhesive layer; and a protective substrate, which are formed in this order,
wherein relative permittivity A in the upper adhesive layer and relative permittivity B in the lower adhesive layer satisfy expression (1):
Relative permittivity A≧relative permittivity B  (1)at respective temperatures set in increments of 20° C. from −40° C. to 80° C., and
wherein a temperature dependency of the relative permittivity B in the lower adhesive layer as determined by a temperature dependency evaluation test is up to 30%, the temperature dependency evaluation test including sandwiching an adhesive layer between aluminum electrodes, increasing a temperature of the adhesive layer in increments of 20° C. from −40° C. to 80° C., calculating relative permittivity of the adhesive layer at respective temperatures by impedance measurement at 1 MHz, selecting a minimum value and a maximum value from the relative permittivity calculated at the respective temperatures and taking a value (%) determined from an expression [{(maximum value−minimum value)/minimum value}×100] as a temperature dependency.