Electromagnetic Resonance Pen Core Structure for Tilted Pressure Sensing
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Solution Overview
Problem
Existing electromagnetic resonance pens struggle to maintain a desirable magnetic field distribution when tilted horizontally for wide-range drawing, potentially reducing the strength of the housing and failing to accurately transmit pen pressure due to improper arrangement of the magnetic body and core body.
Innovation Solution
The electromagnetic resonance pen features a housing with an opening, a pen pressure detection unit, a columnar magnetic body with a wound coil, and a core body with a core rod that transmits force to the detection unit, along with a magnetic body holder to prevent the magnetic body from being pulled out, ensuring appropriate magnetic field distribution and pen pressure detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the electromagnetic resonance pen is tilted horizontally for wide-range drawing, then the drawing range is improved, but the pen pressure cannot be accurately transmitted to the detection unit
Solution Approach 1:
The core body is divided into a pressing member and a core rod, which are separable components. The pressing member transmits force to the core rod, which in turn transmits force to the detection unit. This segmentation allows the force transmission path to be optimized independently from the magnetic field generation components.
Solution Approach 2:
The core rod acts as an intermediary component between the pressing member and the detection unit. It transmits the force applied to the pressing member to the detection unit, ensuring accurate pen pressure detection even when the pen is tilted horizontally for wide-range drawing.
2Reliability
If the magnetic body is arranged on the housing for electromagnetic resonance function, then the magnetic field distribution is improved, but the strength of the housing is reduced
Solution Approach 1:
The magnetic body is separated from the housing structure and mounted on the core body instead. This segmentation allows the housing to maintain its strength while the magnetic body is positioned to provide the desired magnetic field distribution for electromagnetic resonance detection.
Solution Approach 2:
The core body serves as an intermediary carrier for the magnetic body, positioning it appropriately within the pen structure. This allows the magnetic body to be arranged for optimal electromagnetic resonance function without compromising the housing's structural integrity.
3Measurement precision
If the core body is bent to transmit force when tilted, then the pen pressure is transmitted to the detection unit, but the core body structure becomes complex
Solution Approach 1:
The core body is segmented into a pressing member and a core rod that can move relative to each other. The pressing member has a simpler structure that receives force, while the core rod transmits this force linearly to the detection unit, avoiding the need for a bent or complex core body structure.
Solution Approach 2:
The core rod is designed to move dynamically within the pressing member, allowing it to transmit force effectively regardless of the pen's orientation. This dynamic arrangement simplifies the overall core body structure compared to a fixed bent design.
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 solution allows for accurate detection of pen pressure and position indication even when the pen is tilted, maintaining a strong housing structure and enabling wide-range drawing without reducing the magnetic field distribution.
Implementation Method 1
a resonant circuit including a coil and a capacitor is mounted
Implementation Method 2
determining how to arrange a magnetic body (ferrite core), around which the coil is wound, with respect to the housing
Implementation Method 3
an electromagnetic resonance pen that functionally operates as a position indicator for a position detection apparatus of an electromagnetic resonance system
Data Source
AI summary
An electromagnetic resonance pen includes a housing including an opening portion at one end, a pen pressure detection unit fixed to the housing, a columnar magnetic body around which a coil is wound and which includes a through hole, and a core body including a core rod loosely fitted to the through hole of the columnar magnetic body and configured to transmit force to the pen pressure detection unit. The core body includes a wall portion including an inner wall facing a columnar side surface of the columnar magnetic body along a predetermined length in an axial direction of the housing. The electromagnetic resonance pen uses the columnar magnetic body to form a magnetic field.