Electronic Pen Knock Mechanism for Stable Coil Positioning
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Solution Overview
Problem
In conventional electronic pens, components such as coils in electromagnetic induction type pens can come into contact with the pen housing, causing instability in magnetic flux and affecting interaction with position detection sensors due to varying protrusion lengths and knock operations.
Innovation Solution
An electronic pen design featuring a projection portion on the main body housing engaged with a stopper on the pen housing inner wall, preventing the main body from moving towards the tip side and ensuring components like coils do not contact the inner wall, thereby maintaining stable magnetic flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electronic pen main body is housed in the pen housing with the back end fitted to the fitting portion, then the electronic pen main body can be easily replaced like a refill, but the pen tip side can freely move causing components to contact the inner wall surface
Solution Approach 1:
The patent applies local quality by creating a stopper portion at a specific location on the pen housing inner wall and a corresponding projection portion on the main body housing. This localized structural feature provides constraint exactly where needed (at the pen tip side) without affecting the overall replaceability of the main body. The stopper portion engages with the projection portion to prevent excessive protrusion, thereby preventing component contact with the inner wall surface while maintaining the ease of replacement capability.
2Ease of operation
If a conventional knock cam mechanism using a rotating cam is used, then the pen tip can be pushed out and retracted, but the pen tip side temporarily protrudes more than the normal amount during knock operation causing component contact
Solution Approach 1:
The patent applies preliminary anti-action by pre-installing the stopper portion on the pen housing inner wall and the projection portion on the main body housing before any knock operation occurs. This preliminary structural arrangement creates a mechanical limit that prevents the main body from protruding beyond a safe distance during knock operations. When the knock cam mechanism operates, the stopper portion engages with the projection portion to restrict excessive movement, thereby preventing component contact with the inner wall surface while allowing normal knock functionality.
3Reliability
If the coil comes into contact with the inner wall surface due to excessive protrusion, then a load is applied to the coil causing unstable magnetic flux, but the projection-stopper mechanism prevents this contact
Solution Approach 1:
The patent applies local quality by implementing a focused constraint mechanism using the stopper portion and projection portion at the critical location where the main body interfaces with the pen housing. This localized structural feature prevents excessive protrusion and coil contact with the inner wall surface, thereby maintaining magnetic flux stability. The solution adds minimal structural complexity only where needed, rather than redesigning the entire mechanism.
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
Prevents components from contacting the pen housing, ensuring stable magnetic flux and consistent interaction with position detection sensors, enhancing the pen's operational reliability.
Implementation Method 1
a coil wound around a magnetic core in an electronic pen of an electromagnetic induction type
Data Source
AI summary
An electronic pen includes a cylindrical pen housing having an opening on a pen tip side and having a hollow portion inside, and an electronic pen main body having a cylindrical main body housing to be housed in the hollow portion of the pen housing. An axial member is installed on one end side of the main body housing, while another end side of the main body housing is locked in the pen housing. A projection portion projecting in a direction crossing the axial direction is formed on an outer circumference portion of the main body housing at a predetermined position in the axial direction. A stopper portion to be engaged with the projection portion in a state in which a tip end side of the axial member is exposed outside from the opening is formed on an inner wall surface of the hollow portion of the pen housing.