Pointer Magnet Protection via Buffering Member
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Solution Overview
Problem
Existing electromagnetic pointers face challenges in achieving accurate and high-resolution location coordinates and pen touch pressure detection due to signal deviations and potential damage from impact forces.
Innovation Solution
A pointer design incorporating a casing with a first and second electromagnetic unit, an elastic member, and a pen point, where the second magnet is protected by a buffering protection member to prevent damage and signal deviation, ensuring accurate and stable signal generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second magnet is directly exposed without protection, then the structure is simple, but the magnet is vulnerable to impact damage and signal deviation
Solution Approach 1:
The patent applies beforehand cushioning by introducing a protection member that wraps around the second magnet before impact occurs. This protection member includes a buffering portion positioned between the magnet and potential impact sources, providing preemptive protection against drops or collisions. The buffering portion absorbs impact energy through elastic deformation, preventing direct transmission of shock forces to the magnet, thereby maintaining signal accuracy and preventing magnet damage without requiring complex protective structures.
2Strength
If the protection member is made of rigid material, then structural strength is high, but impact force transmission to the magnet increases
Solution Approach 1:
The patent applies parameter changes by carefully selecting and designing the protection member with specific material properties and geometric parameters. The protection member is designed with a buffering portion that has controlled elasticity and damping characteristics. By adjusting parameters such as wall thickness, material hardness, and buffering zone dimensions, the protection member achieves optimal balance between structural strength for protection and impact force absorption. The buffering portion is designed to deform elastically under impact, converting kinetic energy into deformation energy, thereby reducing force transmission to the magnet while maintaining adequate protective strength.
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 design enhances the accuracy and resolution of location coordinates and pen touch pressure detection while prolonging the service life of the pointer by buffering impact forces and maintaining signal consistency.
Implementation Method 1
the first electromagnetic unit includes a first magnet and a coil, where the first magnet is fixedly disposed in the accommodation space, and the coil winds around the first magnet
Implementation Method 2
The elastic member is disposed in the accommodation space and can provide an elastic force to the second electromagnetic unit along the axial direction
Data Source
AI summary
A pointer includes a casing, a first electromagnetic unit, a second electromagnetic unit, a first elastic member, and a pen point. The casing has an accommodation space and a port in communication with the accommodation space. The first electromagnetic unit includes a first magnet and a coil winding around the first magnet. The first magnet is fixedly disposed in the accommodation space. The second electromagnetic unit is movably disposed in the accommodation space along an axial direction, where the second electromagnetic unit includes a second magnet and a protection member wrapping the second magnet, and the second magnet is relatively away from or close to the first magnet. The elastic member is disposed in the casing and can provide an elastic force to the second electromagnetic unit along the axial direction. The pen point is movably disposed at the port and connected to the protection member.