Electronic Pen Coil Spring Core Body Electrical Connection
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Solution Overview
Problem
Existing electronic pens face reliability issues due to variations in the force applied by coil springs, affecting the detection of subtle writing pressures and the precision of writing trace reproduction, leading to potential contact failures and reduced accuracy in position indication signals.
Innovation Solution
An electronic pen design featuring a coil spring with low spring constant and low elastic modulus, allowing the core body to penetrate through its center axis, ensuring consistent electrical connection to the electronic circuit and enabling precise detection and transmission of writing pressures, even with slight applied forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coil spring is used to apply force to the pen tip shaft, then electrical connection is maintained, but variation in spring constant causes unreliable writing pressure detection
Solution Approach 1:
The patent extracts the force application function from the coil spring by introducing a separate pressing component. The coil spring only maintains electrical connection, while the pressing component applies controlled force to the pen tip shaft for reliable writing pressure detection without interference from spring constant variation.
Solution Approach 2:
The patent introduces a pressing component as an intermediary between the coil spring and the pen tip shaft. This mediator separates the functions of electrical connection maintenance and force application, allowing each component to perform its specific function without compromising the other.
2Reliability
If the coil spring applies force to the pen tip shaft, then contact reliability improves, but subtle writing pressure detection becomes difficult
Solution Approach 1:
The patent extracts the force application function from the coil spring by introducing a separate pressing component. The coil spring only maintains electrical connection, while the pressing component applies controlled force to the pen tip shaft for reliable writing pressure detection without interference from spring constant variation.
Solution Approach 2:
The patent changes the force application parameters by using a pressing component with controlled elasticity instead of a coil spring. This allows for optimized force characteristics that enable detection of subtle writing pressures while maintaining contact reliability.
3Ease of operation
If the pen tip shaft moves frequently in the axis center direction, then writing operation is enabled, but the coil spring comes off causing contact failure
Solution Approach 1:
The patent extracts the electrical connection maintenance function from the coil spring's force application role. A separate pressing component handles force application, allowing the coil spring to focus solely on maintaining electrical connection even during frequent pen tip shaft movements.
Solution Approach 2:
The patent creates a stable electrical connection interface by separating the force application and electrical connection functions. The pressing component ensures consistent contact pressure while the coil spring maintains electrical connection, creating an equipotential state that remains stable during operation.
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 ensures reliable and precise detection of writing pressures, preventing contact failures and allowing for high-precision rendering inputs, enabling accurate reproduction of writing traces with minimal pressure, thus enhancing the pen's reliability and precision.
Implementation Method 1
a coil spring that is configured to expand and contract and has electrical conductivity
Implementation Method 2
the writing pressure can be detected according to the capacitance between the first electrode 1052 and the second electrode 1054 that changes according to this pressing
Data Source
AI summary
An electronic pen includes an electrically conductive coil spring that expands and contracts, a core body having electrical conductivity, a writing pressure detector having a fitting part fitted to an end of the core body on a side of the core body that is opposite to a side of the core body that includes a pen tip, and an electronic circuit that includes an oscillating circuit. The electronic circuit, in operation, causes a detection result from the writing pressure detector to be included in a signal from the oscillating circuit. The core body penetrates through a center axis of the coil spring and is not biased by the coil spring, and a first end of the coil spring on a side of the coil spring adjacent to the pen tip is connected to the core body and a second end of the coil spring is connected to the electronic circuit.