Passive Electromagnetic Pen Axial Displacement Adjustment
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Solution Overview
Problem
The existing passive electromagnetic pens face issues with size inconsistency due to manufacturing errors and material differences, leading to inconsistent weight senses, which complicates mass production and affects the pen's performance over time.
Innovation Solution
The design includes a pen core with a first iron core and a second iron core, where the coil is wound outside the first iron core, and a pressure regulating plate that rotates to change the axial displacement of an elastic component, ensuring consistent size and weight sense by adjusting the distance between the iron cores, and incorporating a PCBA circuit board for frequency changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a distance relationship structure of two iron cores is used to change inductance value, then the pen diameter can be reduced compared to coil-wound solenoid, but manufacturing errors and material differences cause size inconsistency and weight sense variation
Solution Approach 1:
The patent introduces a dynamic adjustment mechanism where the distance between the two iron cores can be adjusted after assembly. The iron core holder includes an adjustment structure that allows the second iron core to move relative to the first iron core, enabling post-assembly calibration of the inductance value to compensate for manufacturing variations.
Solution Approach 2:
The patent changes the parameter of iron core distance dynamically. By adjusting the distance between the two iron cores through the adjustment structure, the inductance value can be modified to compensate for manufacturing errors, ensuring consistent weight sense across different pens.
2Adaptability or versatility
If each part is made of different materials with manufacturing errors, then design flexibility is improved, but assembly produces size inconsistency and weight sense variation
Solution Approach 1:
The patent incorporates a feedback mechanism where the actual inductance value or weight sense is measured, and the adjustment structure is used to modify the iron core distance until the desired specification is achieved. This closed-loop approach ensures consistency despite using different materials with manufacturing tolerances.
Solution Approach 2:
The patent performs preliminary adjustment of the iron core distance during the assembly process. The adjustment structure allows operators to pre-calibrate each pen unit before final assembly, ensuring that weight sense consistency is achieved before the pens are delivered.
3Ease of manufacture
If axial displacement space of elastic component is not standardized, then assembly is easier, but mass production becomes difficult due to inconsistent weight senses
Solution Approach 1:
The patent makes the axial displacement space of the elastic component adjustable through the adjustment structure. This dynamic adjustment capability allows the same assembly process to accommodate variations in elastic component displacement, enabling both easy assembly and consistent mass production quality.
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 solution ensures consistent weight senses across passive electromagnetic pens, facilitating mass production and extending the product's service life by maintaining the inductance value and energy efficiency, while providing a thinner and more aesthetically pleasing design.
Implementation Method 1
a coil is wound outside the first iron core
Implementation Method 2
an elastic component, a pressure regulating plate
Data Source
Figure 1~3
Figure 4
AI summary
Disclosed is a passive electromagnetic pen, which includes a pen core, a first iron core, and an iron core holder, wherein a coil is wound outside the first iron core, the first iron core is fixed to an end of the iron core holder close to a pen tip of the pen core, a second iron core, an elastic component, a pressure regulating plate, and a first structure matched with the pressure regulating plate are disposed in the iron core holder sequentially from front to back, and the pen core is configured to pass through a center of the first iron core, and then drive the second iron core to move; and the pressure regulating plate when in rotation is configured to be in surface contact with the first structure by a surface, so as to generate an axial displacement to change an axial displacement of the elastic opponent. In the invention, the pressure regulating plate in rotation is in surface contact with the first structure by the surface, such that the pressure regulating plate generates the axial displacement, so as to change the axial displacement of the elastic component, thereby enabling an actual size of the passive electromagnetic pen in delivery to be equal to a standard size, ensuring consistent weight senses of each passive electromagnetic pen, and being conducive to mass production. The invention can be widely used in the field of information input devices.