Stylus Charging Mechanism Preventing Premature Switch Trigger
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Solution Overview
Problem
Conventional electronic devices with stylus charging mechanisms risk over-charging the circuit board due to premature triggering of the charging switch during stylus insertion, potentially damaging the circuit board.
Innovation Solution
The electronic device employs an annular sleeve with a first and second protruding portion to replace the latch structure, where the second protruding portion only touches the charging switch when the stylus is fully inserted, thus preventing early triggering and using hooks for secure engagement and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the charging switch is positioned to be easily accessible during stylus insertion, then the charging operation is simplified, but the charging switch may be triggered too early causing over-charging and circuit board damage
Solution Approach 1:
The patent introduces an annular sleeve as an intermediary component between the stylus and the charging switch. The annular sleeve includes a first protruding portion that interacts with the stylus and a second protruding portion that interacts with the charging switch. This intermediary mechanism ensures the charging switch is only triggered when the stylus is fully inserted, preventing early triggering while maintaining operational simplicity
Solution Approach 2:
The annular sleeve is designed to rotate in advance during the stylus insertion process. The first protruding portion of the annular sleeve engages with the stylus first, causing the annular sleeve to rotate preliminarily before the second protruding portion triggers the charging switch. This preliminary action ensures the stylus is properly positioned before charging begins
2Device complexity
If a single-sided hook structure is used to fix the stylus, then the device complexity is reduced, but the force distribution becomes uneven and the stylus retention is insufficient
Solution Approach 1:
The patent employs asymmetric hook structures positioned at different locations around the accommodation groove. The first hook and second hook are strategically placed to provide balanced force distribution while maintaining a relatively simple overall structure. This asymmetric arrangement optimizes both structural simplicity and retention strength
Solution Approach 2:
The fixing mechanism is segmented into multiple independent hook structures (first hook and second hook) rather than using a single complex latch. This segmentation allows each hook to bear specific forces independently, improving overall retention strength while keeping individual components simple and the overall device complexity low
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 design prevents premature charging, enhances stylus retention, reduces the risk of over-charging, and addresses issues of uneven force distribution and assembly tolerance, ensuring reliable and secure charging operations.
Implementation Method 1
the stylus enters the accommodation groove from the open end and pushes the first protruding portion for driving the annular sleeve to rotate about the center column along a first direction
Implementation Method 2
the above-mentioned charging switch provides an elastic restoring force to move the second protruding portion
Implementation Method 3
The annular sleeve rotates about the center column along the reverse direction of the first direction by the weight of the annular sleeve
Data Source
AI summary
An electronic device includes a casing having an accommodation groove with an open end and a base adjacent to the accommodation groove, a stylus whose front edge has a groove, an annular sleeve, a charging switch adjacent to the base and a pair of hooks. The base has a center column protruding along an axial direction. The stylus enters the accommodation groove from the open end. The annular sleeve is sleeved on the center column and has first and second protruding portions. The first protruding portion is located on a movement path of the stylus entering the accommodation groove from the open end until going in thoroughly. The charging switch and the accommodation groove are on different sides of the base. The second protruding portion is adapted to touch the charging switch. The hooks are located on the opposite sides of the accommodation groove and adapted to be fastened with the groove.