Transparent heating film

Abstract

The invention discloses a transparent heating film. The transparent heating film comprises a dielectric transparent base layer; a transparent resistive layer having a surface resistivity of 60-150 [omega] / sq and disposed on the base layer; the electrode layer is provided with at least one electrode circuit pattern, the electrode circuit pattern is composed of grids formed by interweaving micron-sized conductive wires, the grid density of the electrode circuit pattern is between 1 mesh / mm < 2 > and 25 mesh / mm < 2 >, and the electrode circuit pattern is electrically lapped with at least one local area of the resistive layer; and the protective layer is a transparent material thin layer with dielectric property, and the protective layer completely covers the area range comprising the resistance layer and the electrode layer. The transparent heating film disclosed by the invention has the effects of uniformly heating in the whole area and quickly demisting, and the heating value of the local area of the heating film can be randomly adjusted according to the use requirements.

Description

technical field [0001] The invention relates to a heat-generating film, in particular to a transparent heat-generating film that can be applied to defogging windshields of automobiles. Background technique [0002] Because the temperature difference will cause water vapor to condense on the surface of the windshield of the car, which will block the driver's vision and endanger driving safety, so a defogger is installed on the windshield of the car to eliminate the fog on the windshield; Generally, a car defogger attaches multiple defogging lines made of metal to the windshield of the car, and arranges each defogging line in parallel. When energized, the resistance of the defogging line generates electric heat. Conversion effect to heat the windshield of the car to dissipate the fog attached to the windshield; however, when the traditional defogger operates, its heating area is concentrated near the defogging line, while other defogging lines are not attached In the position...

AI Technical Summary

Problems solved by technology

[0002] Because the temperature difference will cause water vapor to condense on the surface of the windshield of the car, which will block the driver's vision and endanger driving safety, so a defogger is installed on the windshield of the car to eliminate the fog on the windshield; Generally, a car defogger attaches multiple defogging lines made of metal to the windshield of the car, and arranges each defogging line in parallel. When energized, the resistance of the defogging line generates electric heat. Conversion effect to heat the windshield of the car to dissipate the fog attached to the windshield; however, when the traditional defogger operates, its heating area is concentrated near the defogging line, while other defogging lines are not attached In the position where the windshield is located, the temperature must be raised by heat conduction. As a result, in addition to prolonging the time required for defogging, the uneven heat distribution will also cause internal stress on the windshield, which will easily lead to windshield after long-term repeated operation. Broken glass, endangering driving safety

Furthermore, the defogging wires of traditional defoggers are made of opaque metal materials, so attaching multiple defogging wires to the windshield will not only have a bad effect on the appearance, but also affect the driver's safety. Obstructed vision, unfavorable driving safety

[0003] In order to improve the traditional defogging line installed on the windshield, which hinders the view and is unsightly, the industry has advanced to replace the metal defogging line with a transparent ITO conductive strip. However, most of the ITO conductive strips are replaced. As a heat source, although it can effectively overcome the problem of windshield visibility, it still cannot improve the uneven distribution of the heating effect during the heating process and the lack of long defogging time. In addition, due to the ITO film The material has the characteristics of hard, brittle and poor ductility. Therefore, when the ITO conductive strip is attached to the non-full plane windshield, it is easy to break at the bending part, resulting in non-conduction and loss of heat and defogging performance.

Images