Electromagnetic Pen Variable Inductance Design
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Solution Overview
Problem
Current electromagnetic pens face challenges with size inconsistency and high production costs due to variable capacitance technology limitations and manufacturing errors, making them difficult to mass-produce effectively.
Innovation Solution
The electromagnetic pen employs a three-iron-core structure with wound coils and an elastic structure, using variable inductance technology to change frequency, and incorporates a silicone ring for buffering and size consistency, replacing variable capacitance and addressing assembly errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If variable capacitance technology is used in electromagnetic pen, then electromagnetic writing function is achieved, but manufacturing cost increases and production accuracy decreases
Solution Approach 1:
The patent changes the technical parameter from variable capacitance to variable inductance. By using an inductor with movable iron cores instead of a variable capacitor, the system achieves electromagnetic writing function while improving manufacturing precision. The inductance value can be adjusted by changing the air gap between iron cores, providing a more manufacturable solution with better size consistency.
Solution Approach 2:
The patent replaces the mechanical variable capacitance system with a mechanical variable inductance system. Instead of using a variable capacitor that requires precise mechanical adjustment, the invention uses an inductor with movable iron cores that can be adjusted through a simple mechanical linkage, thereby reducing manufacturing complexity and improving size consistency.
2Adaptability or versatility
If multiple parts with different materials are assembled, then electromagnetic pen functionality is achieved, but assembly complexity increases and size inconsistency occurs
Solution Approach 1:
The patent merges multiple functional components into an integrated inductor assembly. The coil, iron cores, and movable linkage are combined into a single functional unit that can be pre-assembled and tested as one module, then installed into the pen body. This reduces the number of separate assembly steps and minimizes size inconsistency by ensuring all components are calibrated together.
Solution Approach 2:
The patent segments the electromagnetic pen into modular sections: the inductor assembly with movable iron cores, the coil winding, the linkage mechanism, and the housing. Each module can be manufactured and tested separately, then assembled together, reducing overall assembly complexity while maintaining functionality.
3Strength
If rigid structure is used in electromagnetic pen, then structural strength is improved, but damage from mechanical shock increases
Solution Approach 1:
The patent incorporates a cushioning structure between the inductor assembly and the pen body housing. This cushioning layer is pre-installed to absorb mechanical shocks and vibrations before they can reach and damage the sensitive electronic components, thereby protecting the pen while maintaining structural integrity.
Solution Approach 2:
The patent uses a flexible cushioning material or thin film between rigid components. This flexible layer can deform to absorb mechanical shock while maintaining the overall structural strength of the pen. The flexible element acts as a buffer that protects sensitive internal components from damage during drops or impacts.
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
This design reduces production costs, improves performance, ensures size consistency, and extends the pen's service life by preventing mechanical shock and wear damage.
Implementation Method 1
an elastic structure is disposed between the PCBA circuit board and the iron core holder, the elastic structure plays a role of buffering
Implementation Method 2
The electromagnetic pen transmits an electromagnetic wave based on an internal oscillation circuit thereof
Data Source
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AI summary
Disclosed is an electromagnetic fountain pen, which includes a pen core, a housing, and a pen body located in the housing, the housing includes a front housing and a rear housing, the pen body includes a first iron core and an iron core holder, the iron core holder is provided with a pen core clamp link, a second iron core, and a third iron core, coils are wound outside the first iron core and the second iron core, the first iron core is close to a pen tip of the pen core, the pen core is configured to pass through a center of the first iron core, and then is clamped by one end of the pen core clamp link, and the other end of the pen core clamp link is configured to pass through a center of the second iron core, and then drive the third iron core to move; and a PCBA circuit board is disposed in the rear housing, and an elastic structure is disposed between the PCBA circuit board and the iron core holder. In the invention, a variable capacitance technology is replaced with a variable inductance technology, such that a price is lower and a performance is better; and the elastic structure is additionally disposed between the iron core holder of the front housing and the PCBA circuit board, such that a size consistency is good, mass production is facilitated, and a service life is prolonged. The invention can be widely used in the field of information input devices.