Electronic Pen Central Rod Composite Structure
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Solution Overview
Problem
Existing electronic pen central rods face challenges in maintaining strength while being made smaller and thinner, leading to potential detachment of pen tips during use and complex manufacturing processes, along with difficulties in replacing pen tips and wear-out of connecting portions affecting writing pressure detection.
Innovation Solution
The electronic pen central rod is designed with a front-end member, back-end member, and connection member configuration, featuring detachable engagement portions with varying holding strengths to ensure robustness, ease of pen tip replacement, and simplified manufacturing, while maintaining strong attachment to the electronic pen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electronic pen central rod is made smaller and thinner to reduce device size, then the device becomes more compact, but the strength of the central rod is reduced
Solution Approach 1:
The patent employs a composite structure combining a metal pipe part and a resin part. The metal pipe part provides high strength and rigidity, while the resin part allows for miniaturization and cost-effective manufacturing. This composite approach enables the central rod to maintain sufficient strength even when made smaller and thinner.
Solution Approach 2:
The central rod is divided into multiple segments: a metal pipe part and a resin part that are press-fit together. This segmentation allows each material to contribute its strengths - the metal portion provides structural integrity while the resin portion enables size reduction and integrates other functions.
2Ease of manufacture
If press-insertion method is used to attach pen tip part to pipe part, then manufacturing is simplified, but connection strength is insufficient causing potential detachment during use
Solution Approach 1:
The connection structure uses a composite of metal pipe part and resin part with different mechanical properties. The resin part deforms plastically during press-insertion to create a strong mechanical interlock, while the metal pipe part maintains structural integrity. This composite approach achieves both ease of manufacture and high connection strength.
Solution Approach 2:
The patent utilizes the difference in material parameters between metal and resin, particularly their different plastic deformation characteristics. The resin part undergoes significant plastic deformation during press-insertion to lock the pen tip part, while the metal pipe part remains elastic. This parameter difference enables strong connection through a simple press-fit process.
3Strength
If adhesive bonding is used to attach pen tip part to pipe part, then connection strength is improved, but pen tip replacement becomes difficult and manufacturing process becomes time-consuming
Solution Approach 1:
The patent extracts the bonding function from chemical adhesives and replaces it with a mechanical interlocking structure. The resin part's plastic deformation during press-insertion creates the bonding effect, eliminating the need for separate adhesive application steps and enabling easy pen tip replacement while maintaining strong connection.
Solution Approach 2:
The patent replaces the chemical bonding mechanism (adhesive) with a mechanical bonding mechanism (plastic deformation and interlocking). The resin part deforms mechanically during press-insertion to create a strong, permanent connection that still allows for tool-free pen tip replacement, avoiding the complexities of adhesive-based systems.
4Adaptability or versatility
If frequent connection and disconnection of writing pressure detection part occurs, then pen functionality is maintained, but connecting portion wears out or deforms affecting pressure detection
Solution Approach 1:
The connection structure uses a composite of metal pipe part and resin part where the metal provides wear resistance for frequent connections, while the resin provides damping and stress distribution. This composite approach maintains reliable electrical and mechanical connections even after repeated attachment and detachment cycles.
Solution Approach 2:
The resin part acts as a cushioning element that absorbs stress and deformation during repeated connection and disconnection operations. This prevents wear and deformation of the critical metal connection portions, maintaining reliability over time while allowing frequent pen tip replacements.
Data Source
AI summary
An electronic pen central rod is provided. The electronic pen central rod includes a connection member having a front end and a back end, and a front-end member having a pen tip part and a back-end extension part that extends in an opposite direction from the pen tip part to be detachably held by the front end of the connection member with a first level of holding strength. The electronic pen central rod further includes a back-end member having an attachment part to be attached to an electronic pen interior and a front-end extension part that extends in an opposite direction from the attachment part to be held by the back end of the connection member with a second level of holding strength. The second level of holding strength is higher than the first level of holding strength.