Electronic Pen Knock Cam Mechanism Pressure Threshold
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Solution Overview
Problem
Existing electronic pens with a knock-type mechanism face usability issues due to the activation of the knock mechanism with a light pressure, affecting the functionality of the electronic eraser function portion and position indication portions.
Innovation Solution
An electronic pen design with a tubular pen housing featuring a first and second position indication portion, where the second portion includes an electronic eraser function, and a knock cam mechanism driven by a load in the axial direction, utilizing an elastic member to control the operation of the first position indication portion, ensuring it is pushed in and out only with a larger pressure than applied to the second portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the knock operation portion is pressed down with light pressure to protrude the position indication portion for writing input, then the knock operation becomes easy to perform, but the knock mechanism may be accidentally activated when the electronic eraser function portion is used, reducing usability
Solution Approach 1:
The patent applies parameter changes by introducing an elastic member with specific elastic force to create a pressure threshold. The knock cam mechanism is designed to activate only when a predetermined threshold pressure is applied to the knock operation portion, while normal erasing pressure remains below this threshold. This parameter-based differentiation allows the system to distinguish between intentional knock operations and normal eraser usage, preventing accidental activation while maintaining ease of operation.
2Ease of operation
If the position indication portion for writing input is arranged on the knock operation portion side, then the knock mechanism can easily protrude it, but the electronic eraser function portion cannot be properly used without accidental knock mechanism activation
Solution Approach 1:
The patent uses the elastic member as an intermediary element between the knock operation portion and the knock cam mechanism. This intermediary component transmits force only when a predetermined threshold is exceeded, acting as a filter that blocks normal eraser pressure from triggering the knock mechanism while allowing intentional knock operations to pass through and activate the position indication portion.
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 usability of the electronic eraser function and position indication by preventing accidental activation of the knock mechanism with light pressure, maintaining stable operation and preventing contact between internal components and the pen housing, thus improving overall usability and durability.
Implementation Method 1
an elastic member for the knock cam mechanism portion to push in and out the front end side of the first position indication portion from the opening when a pressure larger than a pressure applied to the front end side of the second position indication portion during use of the second position indication portion is applied from the second end side in the axial direction
Data Source
AI summary
Provided is an electronic pen including a tubular pen housing, a first position indication portion arranged on one end side of the pen housing in an axial direction, a second position indication portion arranged on another end side of the pen housing in the axial direction, and a knock cam mechanism portion driven by a load applied from the other end side in the axial direction. The electronic pen further includes an elastic member for the knock cam mechanism portion to push in and out a front end side of the first position indication portion from an opening of the pen housing when a pressure larger than a pressure applied to the front end side, located on the other end side in the axial direction, of the second position indication portion during use of the second position indication portion is applied to the other end side in the axial direction.