Automobile Windshield Resistor Current Control
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Solution Overview
Problem
Automobile window glass with antifogging functions faces challenges in maintaining a wide field of view for passengers due to the elongated heating wire outside the information acquisition region, which requires a larger shielding area, thereby narrowing the field of view.
Innovation Solution
Incorporating a resistor between the heating portion and the power supply to adjust the current flowing through the heating wire, allowing for a shorter surplus wire and reducing the shielding area, thus preserving the field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the length of the heating wire disposed outside the heating region is increased to adjust the current, then the resistance of the heating wire is changed to control the current flowing into the heating wire, but the area for placing the surplus wire becomes large, requiring a larger shielding layer area, which narrows the field of view of passengers
Solution Approach 1:
The patent extracts the current control function from the heating wire itself and relocates it to a separate resistor component. The resistor is connected in series with the heating wire between the power supply and the heating region, allowing current adjustment without extending the heating wire outside the heating region. This separation removes the surplus wire that would otherwise require shielding, thus resolving the contradiction between current control reliability and shielding layer area.
2Ease of operation
If the length of the heating wire disposed outside the heating region is increased, then the resistance of the heating wire is changed to adjust the current, but the surplus wire must be placed avoiding bonding regions, making the area for placing the surplus wire inevitably large
Solution Approach 1:
The patent extracts the current adjustment function from the heating wire structure and implements it through a separate resistor component connected in series. This allows current adjustment to be achieved without extending the heating wire outside the heating region, eliminating the need to route surplus wire around bonding regions and reducing the area required for wire placement.
3Object-affected harmful factors
If the area for placing the surplus wire is shielded by a shielding layer, then the shielding layer area becomes large, but the field of view of passengers in the automobile becomes narrow
Solution Approach 1:
The patent extracts the surplus wire that would require shielding and replaces it with a compact resistor component. By moving the current control function from the heating wire extension to a separate resistor, the need for large-area shielding is eliminated, thereby preserving the passenger field of view while maintaining electromagnetic shielding where necessary.
Solution Approach 2:
The patent changes the physical configuration by replacing an elongated wire structure with a compact resistor component. This parameter change from linear wire extension to compact component reduces the spatial footprint required for current control, eliminating the need for large shielding areas and preserving the passenger field of view.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively secures a favorable field of view for passengers by minimizing the area required for the surplus wire and preventing unnecessary heating of the information transmitting/receiving region and the camera bracket.
Implementation Method 1
a heating wire which acts as the heating portion has a resistivity (adjustable resistance width) determined for each material employed. The heating wire is connected to the battery (power supply) of an automobile through a wiring, and a constant voltage (for example 11 to 14V) is applied from the battery. And, a means of adjusting the current which flows into the heating wire is required, and as an example of the means, it is considered to adjust the length of a heating wire disposed outside the heating region, that is a wire disposed between the bus bar portion and the heating region.
Data Source
AI summary
To provide an automobile window glass having an antifogging function, which can secure a favorable field of view of passengers in an automobile.A windshield 10 according to an embodiment comprises an in-vehicle camera 20, a conductor 26, and wirings 36 and 40 to connect the conductor 26 and a battery 38. The conductor 26 has a heating portion 30, and has a resistor 50 between the heating portion 30 and the battery 38. The heating portion 30 heats an information transmitting/receiving region 28 which allows the in-vehicle camera 20 to take an image of the scenery outside the automobile through the windshield 10. The resistor 50 has a resistance corresponding to the resistance of a surplus wire at the heating portion.