Patent ID: 9645691
Date: 2017-05-09
CPC Classifications: G06F

Claim:
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): 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.