Magnetic Line Sensor Capacitor Orientation for Vibration Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional multi-channel magnetic line sensors face limitations in resolution due to the number of magnetic sensor elements, leading to noise issues from vibrations transmitted through chip ceramic capacitors, which are costly to address.
Innovation Solution
A magnetic line sensor design with chip ceramic capacitors arranged orthogonally to the main scanning direction to suppress noise, using amplifier circuits connected via orthogonally arranged capacitors to reduce vibrations' impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple magnetic sensor elements are arranged in the main scanning direction to increase resolution, then the resolution is improved, but the number of chip ceramic capacitors increases leading to increased noise from vibrations
Solution Approach 1:
The patent applies local quality by orienting chip ceramic capacitors in different directions based on their position relative to vibration sources. Specifically, capacitors in regions susceptible to vibration from the thickness detection sensor are oriented with their longitudinal axis perpendicular to the vibration direction, while other capacitors may be oriented parallel to the main scanning direction. This localized differentiation reduces vibration-induced noise in critical areas while maintaining overall system performance.
Solution Approach 2:
The patent employs asymmetry by intentionally creating non-uniform orientation patterns of chip ceramic capacitors across the substrate. Instead of all capacitors being oriented uniformly, the invention introduces asymmetric orientation arrangements where capacitors are positioned at different angles (0° or 90° relative to the main scanning direction) based on their specific location and exposure to vibration sources, thereby optimizing noise reduction performance.
2Reliability
If chip ceramic capacitors are mounted on the substrate to process signals from magnetic sensor elements, then the signal processing function is achieved, but vibrations from the thickness detection sensor are transmitted to the capacitors causing noise
Solution Approach 1:
The patent applies local quality by orienting chip ceramic capacitors in different directions based on their position relative to vibration sources. Specifically, capacitors in regions susceptible to vibration from the thickness detection sensor are oriented with their longitudinal axis perpendicular to the vibration direction, while other capacitors may be oriented parallel to the main scanning direction. This localized differentiation reduces vibration-induced noise in critical areas while maintaining overall system performance.
Solution Approach 2:
The patent uses the orientation of chip ceramic capacitors as an intermediary mechanism to reduce vibration transmission. By positioning capacitors with their longitudinal axis perpendicular to the vibration direction from the thickness detection sensor, the capacitor structure acts as a mechanical filter, blocking the transmission of vibrational energy while maintaining electrical signal processing functionality.
3Reliability
If conventional multi-channel magnetic line sensors use multiple magnetic sensor elements per channel, then noise resistance is improved, but the resolution in the main scanning direction cannot be increased
Solution Approach 1:
The patent applies segmentation by dividing the magnetic line sensor into multiple independent channels, each with its own magnetic sensor element. This allows the sensor to achieve high resolution in the main scanning direction by increasing the number of channels, while the selective orientation of capacitors in each channel maintains noise resistance. Each channel processes signals independently, enabling both high resolution and noise immunity.
Solution Approach 2:
The patent resolves the contradiction by adding a dimensional aspect to capacitor orientation. Instead of solely relying on the number of sensor elements, the invention introduces the orientation dimension (0° or 90° relative to the main scanning direction) as an additional degree of freedom. This allows the system to achieve both high resolution through increased channel count and noise resistance through strategic orientation of capacitors in the vertical dimension.
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
Effectively suppresses noise in output signals without increasing costs, enhancing resolution and reducing noise generation from external vibrations.
Implementation Method 1
the vibrations of the thickness detection sensor seem to be transmitted to the magnetic line sensor to cause the substrate of the magnetic line sensor to vibrate
Implementation Method 2
resulting in a piezoelectric effect on the chip ceramic capacitors mounted on the substrate. This seemingly causes the noise.
Data Source
Figure 1~2
Figure 3~5
Figure 6(a)~6(b)
AI summary
Provided are a magnetic line sensor capable of inexpensively suppressing noise due to vibrations from outside the magnetic line sensor, a sheet recognition unit, and a sheet handling device. The magnetic line sensor is in a multi-channel system and detects magnetic information of a transported sheet. The magnetic line sensor includes multiple magnetic sensor elements each provided for a corresponding channel and arranged in a main scanning direction, multiple chip ceramic capacitors each electrically connected to a corresponding one of the multiple magnetic sensor elements and each having a pair of external electrodes, and a substrate on which the chip ceramic capacitors are mounted. At least one of the chip ceramic capacitors has its pair of external electrodes aligned in a direction orthogonal to the main scanning direction.