Electrically heatable solar reflective coated glazing with windows in coating configured, shaped and dimensioned in such a way as to minimise inhomogeneous heating

摘要

A vehicle glazing panel having an electrically heatable radiationreflective coating layer, at least two bus bars adapted to relay electrical power to the coating layer and at least a window, in the coating layer, permeable to electromagnetic radiations, which, when submitted to a power of 1000 W/m2 during 4 minutes, presents in a portion of the glazing panel delimited by the bus bars and not including the bus bars tips and their close periphery, a maximum temperature and a minimum temperature, such that the difference between the maximum temperature of the glazing panel with the window and the maximum temperature of the same glazing panel without window does not exceed 25° C. This may be used to minimise perturbations to the heating of the glazing caused by the presence of the window permeable to electromagnetic radiations and/or provide more even heating over the entire windscreen.