Abstract: Provided are a planar heat generating body and a vehicle windshield device that are capable of effectively suppressing adhesion of foreign matter thereto. The planar heat generating body includes: a heat generating wire that repeatedly folds so as to cover a surface surrounded by an outline; and a conducting wire for supplying current to the heat generating wire, that has a lower electrical resistance than the heat generating wire, as a result of having a greater width than the heat generating wire, and follows the outline.

Abstract: A thermal insulation structure for a vehicle window device is provided with a heater is disposed on a vehicle interior side, a heat-receiving component that is provided between the window and the heater, and that, by receiving heat from the heater, imparts radiant heat to the window, and a thermal insulation layer that is provided at a surface of the heater on an opposite side from the heat-receiving component, wherein the thermal insulation layer is formed by mutually superimposing a plurality of thermal insulation materials, and of the plurality of thermal insulation materials, a thermal insulation material on a closest side to the heater has greater heat resistance than a thermal insulation material on a furthest side from the heater, and the thermal insulation material on the furthest side from the heater has a lower thermal conductivity than the thermal insulation material on the closest side to the heater.

Abstract: Provided are a planar heat generating body and a vehicle windshield device that are capable of effectively suppressing adhesion of foreign matter thereto. The planar heat generating body includes: a heat generating wire that repeatedly folds so as to cover a surface surrounded by an outline; and a conducting wire for supplying current to the heat generating wire, that has a lower electrical resistance than the heat generating wire, as a result of having a greater width than the heat generating wire, and follows the outline.

Abstract: A sheet heater comprises a sheet form heating unit configured from a wire heater. The heating unit comprises a first heating unit positioned along a peripheral edge of the area subject to heating, and a second heating unit positioned at an area surrounded by the first heating unit. The second heating unit comprises a plurality of meandering parts, with mutually adjacent meandering parts overlapping each other in the meandering direction. In the heating unit, the width (WL) of the wire heater is greater than the width (WP) between mutually adjacent wire heaters.

Abstract: A thermal insulation structure for a vehicle window device is provided with a heater is disposed on a vehicle interior side, a heat-receiving component that is provided between the window and the heater, and that, by receiving heat from the heater, imparts radiant heat to the window, and a thermal insulation layer that is provided at a surface of the heater on an opposite side from the heat-receiving component, wherein the thermal insulation layer is formed by mutually superimposing a plurality of thermal insulation materials, and of the plurality of thermal insulation materials, a thermal insulation material on a closest side to the heater has greater heat resistance than a thermal insulation material on a furthest side from the heater, and the thermal insulation material on the furthest side from the heater has a lower thermal conductivity than the thermal insulation material on the closest side to the heater.