Heating element having communication window
Disclosed is a heating element, including: a substrate; a first bus bar provided on the substrate; a second bus bar which is provided on the substrate so as to be opposite to the first bus bar; and a heating pattern which is provided to electrically connect the first bus bar and the second bus bar, wherein the heating pattern includes a first pattern region which is in contact with the first bus bar and a second pattern region which is in contact with each of the second bus bar and the first pattern region and the first pattern region has an opening region which serves as a communication window.
1. A heating element, comprising:
a substrate;
a first bus bar on the substrate;
a second bus bar on the substrate positioned opposite to the first bus bar; and
a heating pattern electrically connecting the first bus bar and the second bus bar,
wherein the heating pattern includes a first pattern region that is in contact with the first bus bar and a second pattern region that is in contact with the second bus bar and the first pattern region, and the first pattern region has an opening region which serves as a communication window, and a ratio of a sheet resistance of the second pattern region with respect to a sheet resistance of the first pattern region is 1 or more,
wherein in the first pattern region of the heating pattern includes first heating lines that connect the first bus bar and the second pattern region, and the first heating lines are not connected to each other in a portion other than a first heating line partitioning the opening region, and each one of the first heating lines independently connects the first bus bar and the second pattern region.
2. The heating element of claim 1 , wherein a deviation of resistance across each of the first heating lines from the first bus bar to an interface between the first pattern region and second pattern region is 10% or less.
3. The heating element of claim 1 , wherein a ratio of a sheet resistance of the first bus bar with respect to a sheet resistance of the first pattern region is 0.1 or less.
4. The heating element of claim 1 , wherein a deviation of a sheet resistance in the second pattern region is 10% or less.
5. The heating element of claim 1 , wherein an opening region which serves as a communication window in the first pattern region is formed to be in contact with the center of the first bus bar in a longitudinal direction.
6. The heating element of claim 1 , wherein each of the first bus bar and the second bus bar includes one power source connecting unit.
7. The heating element of claim 1 , wherein the heating element is provided for a front glass of a vehicle.
8. The heating element of claim 1 , wherein the heating element is provided for a front glass of a vehicle, the first bus bar is disposed in a position corresponding to a top portion of the front glass of the vehicle, and the second bus bar is disposed in a position corresponding to a bottom portion of the front glass of the vehicle.
9. The heating element of claim 1 , wherein the heating element is provided for a front glass of a vehicle and the second pattern region includes a region corresponding to a center of a field of view from a driver's seat, and the first pattern region corresponds to a region which does not affect the field of view.
10. A heating element comprising:
a substrate;
a first bus bar on the substrate;
a second bus bar on the substrate positioned opposite to the first bus bar; and
a heating pattern electrically connecting the first bus bar and the second bus bar,
wherein the heating pattern includes a first pattern region that is in contact with the first bus bar and a second pattern region that is in contact with each of the second bus bar and the first pattern region, and the first pattern region has an opening region that serves as a communication window, and the first pattern region includes heating lines that connect the first bus bar and the second pattern region, and a deviation of resistance of each heating line from the first bus bar to an interface between the first pattern region and second pattern region is 10% or less,
wherein the heating lines in the first pattern region are not connected to each other in a portion other than a heating line partitioning the opening region, and each heating line independently connects the first bus bar and the second pattern region.
11. The heating element of claim 10 , wherein a ratio of a sheet resistance of the second pattern region with respect to a sheet resistance of the first pattern region is 1 or more.
12. The heating element of claim 10 , wherein a ratio of a sheet resistance of the first bus bar with respect to a sheet resistance of the first pattern region is 0.1 or less.
13. The heating element of claim 10 , wherein a deviation of a sheet resistance in the second pattern region is 10% or less.