Fill Level Sensor Signal Transmitter With Printed Resistor Layout
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Solution Overview
Problem
Existing fill level sensors for motor vehicle containers have a bulky design due to the radial arrangement of the resistor arrangement outside the conductor path, leading to variable resistor thickness and increased dimensions.
Innovation Solution
The conductor path arrangement is placed on top of the resistor arrangement, allowing for a compact configuration with constant resistance values and protection of the resistor from contact, enabling the resistor arrangement to be positioned close to or below the slideway, and facilitating easy trimming and material recess creation for resistance adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the resistor arrangement is arranged radially outside the conductor path arrangement, then the signal transmitter can be produced with a conventional process, but the signal transmitter has very large dimensions
Solution Approach 1:
The conductor path arrangement and resistor arrangement are merged into a single planar layer structure. The conductor paths are formed as traces on the same substrate as the resistor arrangement, eliminating the need for radial extension outside the conductor path arrangement. This integration reduces the overall footprint while maintaining conventional production processes.
Solution Approach 2:
The design transitions from a radial three-dimensional arrangement to a planar two-dimensional layout. By arranging conductor paths and resistor elements on the same plane rather than extending radially outward, the signal transmitter achieves compact dimensions while preserving manufacturing simplicity.
2Ease of manufacture
If the conductor paths of the conductor path arrangement are raised, then the conductor paths can be produced separately, but the thickness of the resistor arrangement varies
Solution Approach 1:
The conductor paths and resistor arrangement are formed in the same planar layer, eliminating height differences between them. This co-planar arrangement ensures uniform resistor thickness while allowing separate definition of conductor and resistor regions through standard PCB or printed circuit techniques.
Solution Approach 2:
Different regions of the same substrate serve different functions: high-conductivity trace regions for current flow and resistive regions for sensing. By locally varying the material properties or trace geometry within the planar layer, both separate production capability and uniform thickness are achieved.
3Ease of manufacture
If the resistor arrangement is arranged radially outside the conductor path arrangement, then the production process is conventional, but the signal transmitter has very large dimensions
Solution Approach 1:
The conductor path arrangement and resistor arrangement are merged into a single planar layer structure. The conductor paths are formed as traces on the same substrate as the resistor arrangement, eliminating the need for radial extension outside the conductor path arrangement. This integration reduces the overall footprint while maintaining conventional production processes.
4Reliability
If the resistor arrangement is protected from contact with the sliding contact, then the resistor arrangement can be arranged close to the slideway, but the accessibility for trimming is reduced
Solution Approach 1:
The conductor path arrangement serves as an intermediary protective layer that shields the resistor arrangement from direct contact with the sliding contact. This intermediate structure allows the resistor arrangement to be positioned close to the slideway for compactness while maintaining accessibility through the conductor path openings or edges for trimming operations.
Data Source
AI summary
A signal transmitter for a fill level sensor, a conductor path arrangement is printed on a resistor arrangement. The resistor arrangement is located below a slideway and is accessible between conductor path sections for trimming of the resistor. The signal transmitter is of particularly compact configuration and can be produced at low cost.