Motorized Stylus Positioning via Rotating Shaft Sensors
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Solution Overview
Problem
Conventional touch modules require complex additional positioning mechanisms to position a stylus on a touch surface, which hinders thin module design and efficiency.
Innovation Solution
A touch module with an angle encoder and distance sensor on a rotating shaft of a motorized stylus calculates rotating angles and relative distances to determine local minimum positions, allowing the stylus to be positioned on the touch surface without additional assembly of positioning parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional touch positioning mechanisms are assembled on the touch module, then touch positioning capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the touch positioning function with the existing motor rotating shaft by mounting the angle encoder and distance sensor on the rotating shaft. This integration eliminates the need for separate positioning mechanisms, reducing device complexity while maintaining positioning capability through the coordinated data from both sensors.
Solution Approach 2:
The rotating shaft is given multiple functions: it serves both as the actuator for the stylus and as the mounting platform for positioning sensors. The angle encoder and distance sensor share the rotating shaft structure, allowing one component to fulfill multiple roles in the system.
2Measurement precision
If additional touch positioning mechanisms are assembled on the touch module, then touch positioning capability is improved, but module thinness deteriorates
Solution Approach 1:
The positioning sensors are nested on the rotating shaft structure, which itself is part of the motor assembly. This nested arrangement allows the sensors to be housed within the existing motor footprint rather than adding external positioning components that would increase module thickness.
3Measurement precision
If angle encoder and distance sensor are disposed on rotating shaft, then positioning accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The angle encoder and distance sensor are mounted on the rotating shaft during the motor assembly process, before the final integration into the touch module. This preliminary mounting allows for standardized motor assemblies with pre-integrated sensors, simplifying the overall manufacturing process through modular assembly.
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
This approach enables efficient touch positioning without the need for complex additional mechanisms, enhancing the thinness and functionality of the touch module.
Implementation Method 1
The angle encoder is disposed on the rotating shaft for generating encoded data with rotation of the rotating shaft
Implementation Method 2
The distance sensor is disposed on the rotating shaft to rotate cooperatively with the rotating shaft, for detecting a plurality of relative distances between itself and the first side, the second side, the third side, and the fourth side of the front frame respectively
Data Source
AI summary
A touch module includes a touch device, a stylus, and a processing unit. The stylus includes a body, a motor, an angle encoder, and a distance sensor. The angle encoder and the distance sensor are disposed on a rotating shaft of the motor. The distance sensor detects relative distances between itself and first, second, third, and fourth sides of a front frame of the touch device respectively. The processing unit is disposed in the body or the touch device for controlling the rotating shaft to rotate when a mark of the body points to the first side, calculating rotating angles of the rotating shaft and determining whether the rotating shaft makes one rotation according to encoded data of the angle encoder, and calculating four local minimum distances according to relationship of the rotating angles and the relative distances for positioning the stylus on a touch surface of the touch device.