Trackball Module Integration for Sensing Precision
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Solution Overview
Problem
The integration of trackball devices and control chipsets in conventional electronic devices faces challenges due to manufacturing and assembling tolerances, leading to inaccurate sensing and reduced user operation precision, which is not effectively addressed by replacing Hall ICs with reed switches.
Innovation Solution
A modular trackball module structure comprising a base, flexible printed circuit, trackball device, and lid, where the trackball device and control chipset are integrated within the base and connected via a flexible printed circuit, allowing precise location and reducing electrostatic discharge through metal construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the trackball device is fixed at the casing and Hall ICs are welded on the motherboard separately, then the manufacturing cost is reduced and assembly is simplified, but the sensing precision deteriorates due to accumulated tolerance
Solution Approach 1:
The patent merges the trackball device and control chipset into a single integrated module mounted on the motherboard, eliminating the need for separate fixation of components. This integration ensures precise relative positioning between magnetic rollers and Hall ICs while maintaining ease of manufacturing through modular assembly.
Solution Approach 2:
The patent introduces a precision positioning structure as an intermediary component between the trackball device and Hall ICs. This mediator component ensures accurate alignment and fixed relative positioning, compensating for manufacturing tolerances and preventing precision degradation.
2Measurement precision
If manufacturing and assembling tolerances are reduced to improve sensing precision, then the measurement precision improves, but the manufacturing complexity and cost increase
Solution Approach 1:
By integrating the trackball device and control chipset into one module, the patent reduces the number of separate components and their interfaces, thereby simplifying manufacturing while ensuring precise relative positioning within the integrated structure.
Solution Approach 2:
The patent implements preliminary precision positioning during the module integration stage, establishing accurate relative positions between components before final assembly. This preliminary action ensures sensing precision without requiring extreme precision in subsequent manufacturing steps.
3Ease of manufacture
If conventional assembly modes are used with reed switches, then the manufacturing cost is reduced, but the reliability deteriorates due to persistent tolerance accumulation
Solution Approach 1:
The patent combines the trackball device and control chipset into an integrated module, eliminating the problems of tolerance accumulation between separately assembled components. This integration maintains cost-effectiveness while significantly improving sensing reliability.
Solution Approach 2:
The patent replaces the mechanical reed switch system with a Hall IC-based magnetic sensing system. This substitution eliminates mechanical contact and associated tolerance issues, improving reliability while maintaining manufacturing efficiency through integrated 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 modular structure enhances sensing precision and user operation by accurately positioning the trackball device and control chipset, while preventing electrostatic discharge, thereby improving overall performance and reliability.
Implementation Method 1
The Hall ICs 74 sense the magnetism change of the magnetic rollers 73
Implementation Method 2
four magnetic rollers 73 and a casing 72 covering them
Data Source
AI summary
A trackball module structure is provided. In the structure, a Hall IC is integrated in a flexible printed circuit, and the integrated structure and a trackball device are disposed on the base to be located. Afterwards, a lid is used to fix the integrated structure and the trackball device to form a module. The module is easy to be disposed on an electronic device. This not only solves the problem that the conventional trackball is hard to locate, but also prevents the ESD with the cooperation of a metal base and a metal lid.