Guide Carriage Encoder Scale for High-Contrast Position Detection
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Solution Overview
Problem
Existing linear profile rail guides with integrated linear encoders face challenges in achieving high contrast sensor signals for position detection, particularly in bright-field measurement, due to insufficient reflectivity differences between scattering and mirror areas, leading to inaccurate displacement measurements and space constraints for sensor devices.
Innovation Solution
A method using a pulsed laser to introduce microstructures into the guide carriage surface, creating alternating marking areas with high absorption and mirror areas, ensuring high contrast detection through bright-field measurement, and utilizing ultrashort pulse lasers for precise, corrosion-resistant surface modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional material measures with scattering zones composed of line elements are used, then the linear encoder can detect position changes, but the sensor signal contrast is low and measurement precision is insufficient
Solution Approach 1:
The patent applies optical absorption principles to create marking areas that strongly absorb light, contrasting with mirror areas that reflect light. This optical contrast mechanism (similar to color changes) enables the sensor to clearly distinguish between marking and mirror areas, significantly improving sensor signal contrast and measurement precision in bright-field measurement mode
Solution Approach 2:
The patent changes the optical parameters of the surface by creating marking areas with specific absorption characteristics. By controlling the optical absorption coefficient and creating distinct optical properties between marking areas (high absorption) and mirror areas (high reflection), the system achieves high-contrast sensor signals for accurate position detection
2Manufacturing precision
If pulsed laser is used to create microstructures, then surface modification precision is improved, but thermal impact on the surface increases
Solution Approach 1:
The patent employs pulsed laser irradiation with specific pulse durations (nanosecond to picosecond range) to create periodic thermal cycles. The pulsed nature allows rapid heating during the pulse and rapid cooling between pulses, enabling precise microstructure formation while limiting cumulative thermal impact on the surrounding material
Solution Approach 2:
The patent uses ultrashort pulse durations (nanosecond to picosecond scale) to deliver energy so rapidly that the thermal process completes before significant heat diffusion can occur. This 'rushing through' the thermal process enables precise surface modification with minimal thermal impact on the bulk material
3Measurement precision
If sensor device is added to guide carriage for position detection, then displacement measurement capability is improved, but the guide carriage structure becomes more complex and space requirements increase
Solution Approach 1:
The patent integrates the linear encoder scale directly onto the guide carriage surface, merging the measurement scale function with the guide carriage structure. This eliminates the need for separate scale components and reduces overall system complexity while maintaining high measurement precision through the optical contrast mechanism
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
The method enhances the accuracy of position detection by providing high-contrast optical scanning with reduced light scattering, allowing for precise measurement of guide carriage displacement while minimizing thermal and mechanical impact on the surface.
Implementation Method 1
A method using a pulsed laser to introduce microstructures into the guide carriage surface
Implementation Method 2
creating alternating marking areas with high absorption and mirror areas
Implementation Method 3
marking areas with high absorption
Implementation Method 4
mirror areas
Data Source
Figure 1A~1C
Figure 2~3
Figure 4A~4B
AI summary
The invention relates to a method for applying a dimensioned representation (15) to a surface of a guide carriage (2) of a linear profile rail guide, wherein the guide carriage (2) is guided on a guide rail (3) of the profile rail guide (1) so that the guide carriage (2) is movable linearly in the longitudinal direction (X) of the guide rail (3), and wherein the guide carriage (2) has a first side surface (2.1) extending in the longitudinal direction (X) of the guide rail (3), and wherein the dimensioned representation (15) has at least one track (SP1, SP2) extending linearly in the longitudinal direction (X) of the guide rail with several mirror areas (S; S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15) and marking areas (M; M1, M2, M3, M4, M5, M6, M7) arranged alternately one after the other. M8, M9, M10, M11, M12, M13, M14).The method comprises providing a pulsed laser for generating a laser beam and providing at least one of the marking areas (M; M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, M12, M13, M14) by introducing a microstructure into a first area of the first side surface of the guide carriage corresponding to the at least one marking area, by generating the laser beam with a sequence of several light pulses and directing the laser beam onto the first area of the first side surface in such a way that the laser beam is moved two-dimensionally relative to the first area and is successively irradiated by the light pulses, wherein each of the different irradiated sub-areas overlaps with at least two other irradiated sub-areas in the longitudinal direction (X) ortransverse to the longitudinal direction (X) which has at least one track (SP1, SP2).