Flexible Wiring Member for Electronic Balance Measurement Error
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Solution Overview
Problem
Conventional loss-in-weight type feeders using electronic balances suffer from measurement errors due to the rigid cables supplying power and control signals, which apply force to the weighing pan and are exacerbated by temperature changes, particularly in high-precision micro measurements.
Innovation Solution
An electronic balance with a flexible wiring member, such as a flexible substrate with a U-shaped curved portion, is integrated within the case to house the sensor unit, eliminating the influence of the wiring on the weighing pan and minimizing additional loads, thereby preventing measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rigid cable is used to supply power and control signals to the motor, then the structure is simple and easy to manufacture, but the cable applies force to the weighing pan causing measurement errors in high-precision micro measurements
Solution Approach 1:
The harmful rigid cable is extracted and removed from the weighing system. Instead, a flexible wiring member is used that can supply power and control signals without applying force to the weighing pan, thereby eliminating the measurement error while maintaining electrical connectivity.
Solution Approach 2:
A flexible wiring member is introduced to replace the rigid cable. This flexible member can accommodate movements and temperature changes without transmitting force to the weighing pan, thus preserving measurement precision while maintaining structural simplicity.
2Measurement precision
If a rigid cable is used for power and signal supply, then the installation is simple, but temperature changes cause linear expansion increasing force on the weighing pan and exacerbating measurement errors
Solution Approach 1:
The flexible wiring member can accommodate thermal expansion and contraction without transmitting force to the weighing pan. Its flexibility allows it to absorb dimensional changes due to temperature variations, maintaining measurement precision while remaining easy to install and operate.
Solution Approach 2:
The physical state of the wiring member is changed from rigid to flexible. This parameter change allows the wiring to adapt to temperature-induced dimensional changes without affecting the weighing pan, thereby maintaining measurement precision while preserving ease of operation.
3Measurement precision
If a flexible wiring member is used within the case, then measurement precision is improved by eliminating cable influence on the weighing pan, but the device structure becomes more complex
Solution Approach 1:
The flexible wiring member is integrated within the existing case structure, merging the electrical connection function with the housing structure. This approach improves measurement precision by eliminating external cable influence while minimizing additional structural complexity through efficient space utilization.
Data Source
AI summary
In an electronic balance used for a scale of a weighing unit of a feeder, a wiring member for supplying an electric signal from a control device to a driving source of a feeder unit is provided so as not to adversely affect a weighing pan. A flexible substrate using as the wiring member has one end provided with an electric signal input substrate and has the other end provided with an electric signal output substrate. A U-shaped curved portion is formed near the electric signal output substrate and arranged below a pan boss. The electric signal output substrate is fixed to the pan boss, the electric signal input substrate is fixed to a fixed frame, and the flexible substrate is provided in a case that houses a sensor unit.