Electronic Pen Core Body with Felt Tip and Rigid Skeleton
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Solution Overview
Problem
Conventional electronic pen core bodies made of felt or elastic materials face challenges in miniaturization due to low strength, durability issues, and difficulty in accurately transmitting pen pressure to the pen pressure detector, leading to poor writing feel and accuracy on glass surfaces.
Innovation Solution
An electronic pen core body design featuring a tip component made of felt coupled with an axis component made of a harder, non-fibrous material, where the axis component includes a recessed hole and a fitting portion for the pen pressure detector, allowing for improved strength, miniaturization, and accurate pressure transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a core body made of felt is used to improve writing feel on glass surface, then the feel of writing is excellent, but the strength is low and miniaturization is difficult
Solution Approach 1:
The core body is constructed as a composite structure combining felt material with a hollow cylindrical skeleton made of resin or metal. The felt provides excellent writing feel on glass surfaces while the rigid skeleton supplies structural strength and enables miniaturization. This composite approach resolves the contradiction between soft feel and structural strength.
Solution Approach 2:
Different parts of the core body have different material properties: the outer felt layer provides soft contact for writing, while the inner hollow cylindrical skeleton provides rigidity and strength. This local differentiation of material quality allows the core body to simultaneously achieve excellent writing feel and sufficient structural strength for miniaturization.
2Ease of operation
If a core body made of felt is used to improve writing feel, then the feel of writing is excellent, but the durability is low
Solution Approach 1:
The combination of felt and rigid skeleton creates a composite structure where the felt maintains excellent writing feel while the rigid skeleton provides durability and resistance to deformation. The skeleton prevents the felt from collapsing or deforming during repeated writing operations, thereby improving durability.
Solution Approach 2:
The core body is segmented into functional components: the felt layer for writing contact and the hollow cylindrical skeleton for structural support. This segmentation allows each component to perform its specific function optimally - the felt provides writing feel while the skeleton ensures durability and maintains structural integrity over time.
3Ease of operation
If a core body made of felt is used, then the feel of writing is excellent, but the dimensional accuracy is poor due to fluffiness
Solution Approach 1:
The rigid hollow cylindrical skeleton provides a dimensionally stable framework that prevents the felt from becoming fluffy or deforming. This skeleton acts as a form-giving structure that maintains precise dimensions while allowing the felt to provide soft writing contact, thereby resolving the contradiction between writing feel and dimensional accuracy.
Solution Approach 2:
The hollow cylindrical skeleton is positioned internally to provide dimensional stability where needed, while the felt covers the exterior to provide writing feel. This local differentiation ensures that the dimensional-critical portions are supported by the rigid skeleton while the writing-contact portions maintain the soft felt characteristics.
4Volume of moving object
If the core body is made thinner to enable miniaturization, then the electronic pen size is reduced, but the strength is insufficient and pressure transmission is poor
Solution Approach 1:
The hollow cylindrical skeleton made of rigid resin or metal provides high structural strength relative to its weight and volume. This allows the core body to be miniaturized while maintaining sufficient strength, as the rigid skeleton efficiently transmits forces even in thin-walled constructions.
Solution Approach 2:
The hollow cylindrical skeleton functions as a thin-walled rigid structure that provides high strength-to-weight ratio. This thin-walled construction enables miniaturization of the core body while maintaining the necessary structural strength and pressure transmission capabilities through the efficient geometry of the hollow cylinder.
5Strength
If the core body is made thicker to maintain strength, then the strength is sufficient, but miniaturization becomes very difficult
Solution Approach 1:
The hollow cylindrical skeleton utilizes the high strength-to-weight ratio characteristic of thin-walled structures. The hollow cylinder geometry provides exceptional structural efficiency, allowing the core body to achieve sufficient strength with minimal wall thickness, thereby enabling miniaturization without sacrificing strength.
Solution Approach 2:
The combination of rigid skeleton material (resin or metal) with the felt covering creates a composite structure where the skeleton provides high strength in a thin profile. This composite approach allows the core body to be both thin (enabling miniaturization) and strong (maintaining structural integrity).
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 strength and miniaturization of the electronic pen core body, enabling accurate transmission of pen pressure and improved writing feel, while reducing dimensional errors and fluffy surface issues, thus allowing for precise and durable writing operations.
Implementation Method 1
the coupling core portion disposed within the recessed hole of the axis component portion and coupled to the inner wall surface of the recessed hole of the axis component portion on the one end of the axis component portion in the axial direction
Implementation Method 2
the side of the core body opposite the tip portion is fitted to the fitting portion through a through hole formed on a magnetic core around which a coil is wound
Data Source
AI summary
Provided is an electronic pen core body including a tip component portion coupled to an axis component portion. At least one end of the axis component portion in an axial direction is made of a material that is harder than a material from which the tip component portion is made. The axis component portion includes a recessed hole and a fitting portion directly or indirectly fitted to a pen pressure detector. The tip component portion includes a tip portion protruding from the one end of the axis component portion in the axial direction, a coupling core portion disposed within the recessed hole and coupled to an inner wall surface of the recessed hole of the axis component portion, and a second ring-shaped end surface that contacts a first ring-shaped end surface of the axis component portion. The first ring-shaped end surface is covered by the second ring-shaped end surface.