Multi-Track Displacement Detection Apparatus
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Solution Overview
Problem
Conventional displacement detection apparatuses face challenges in accurately detecting linear and rotational displacements due to reduced signal output when the detection head unit is positioned between magnetized parts, making it difficult to accurately measure displacement in multiple directions.
Innovation Solution
A displacement detection apparatus with a scale unit featuring track units of varying pitch directions and a detection head unit with multiple detection units positioned to read these tracks, allowing for accurate detection of displacement in two orthogonal directions by preventing signal reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the detection head unit is disposed between the first magnetized part and the second magnetized part, then the structure is compact and can detect displacement in multiple directions, but the signal output is reduced making accurate detection difficult
Solution Approach 1:
The scale unit is divided into multiple track units (first track unit, second track unit, third track unit) with different pitch directions. Each track unit is read by specific detection units, allowing the system to detect displacement in multiple directions (X, Y, and rotational directions) simultaneously without compromising signal quality, as each track provides dedicated signal output for its specific measurement direction
Solution Approach 2:
The patent introduces track units with different pitch directions (first pitch direction for X-axis, second pitch direction for Y-axis, third pitch direction for rotational detection). By adding this dimensional differentiation to the scale structure, the system achieves multi-directional detection capability while maintaining strong signal output from each independently oriented track unit
2Measurement precision
If multiple detection units are added to detect displacement in multiple directions, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The detection head unit is designed as a universal device that can read multiple types of tracks (first track, second track, third track) with different pitch directions using the same detection units. This multi-functionality allows a single detection head to perform X-axis detection, Y-axis detection, and rotational detection without requiring separate detection devices for each direction, thereby reducing overall system complexity
Solution Approach 2:
Multiple track units with different functions (X-axis track, Y-axis track, rotational track) are merged into a single scale unit structure. The detection units read multiple tracks simultaneously, combining multiple measurement functions into one integrated system, which reduces the number of separate components and simplifies the overall device architecture
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
Enables precise detection of displacement in multiple directions by optimizing the placement and configuration of detection units relative to the scale units, enhancing the accuracy of linear and rotational displacement measurements.
Implementation Method 1
The detection head unit has at least three or more detection units each configured to read the scale and to output a signal in accordance with the read scale
Data Source
AI summary
A displacement detection apparatus includes a scale unit and a detection head unit. The scale unit has a reference track unit and sub-track units, the pitch directions of these units being different from one another. The detection head unit has three or more detection units configured to read scales of the reference track unit and the sub-track units and to output signals in accordance with the read scales. The three detection units detect displacement in two orthogonal directions on a plane parallel to a plane along which the detection head unit moves.