Capacitive Stylus Receiver Coil Layout for Offset Wireless Charging
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Solution Overview
Problem
Active capacitive styluses face issues with battery replacement and increased costs due to the use of traditional batteries, which affect their usability and economic viability.
Innovation Solution
An active capacitive stylus designed for wireless charging using a receiver coil that aligns with a transmission coil in a wireless charging transmitter, optimizing power supply through electromagnetic induction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If traditional batteries (AAA, AA, or mercury button batteries) are used for power supply in active capacitive stylus, then the stylus can operate, but periodic battery replacement is required which increases maintenance complexity and cost
Solution Approach 1:
The patent extracts the battery component entirely from the stylus design and replaces it with a wireless power receiver coil. This eliminates the need for periodic battery replacement and reduces maintenance complexity while providing continuous operation capability through wireless charging from a charging surface.
Solution Approach 2:
The patent replaces the mechanical battery insertion/removal system with an electromagnetic wireless power transfer system. The receiver coil in the stylus communicates with a transmitter in the charging surface through electromagnetic induction, eliminating mechanical battery handling and reducing device complexity.
2Duration of action of moving object
If lithium battery is used in active capacitive stylus, then continuous operation is achieved, but the cost of the stylus increases and charging time is required when battery runs out
Solution Approach 1:
The patent enables the stylus to serve itself by incorporating a wireless power receiver that automatically charges when placed on a charging surface. The stylus draws power wirelessly without requiring external charging cables or manual battery replacement, making the charging process as simple as placing the stylus on the charging surface.
3Loss of energy
If receiver coil is positioned close to charging surface for efficient wireless charging, then charging efficiency improves, but positional alignment precision is required which may complicate the charging system
Solution Approach 1:
The patent employs a curved or flexible receiver coil design that can conform to the charging surface geometry. This curvature allows the receiver to maintain close proximity to the charging surface across a larger area, improving wireless charging efficiency while reducing the need for precise positional alignment through geometric adaptation.
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
Enables efficient and cost-effective charging of the active capacitive stylus without the need for battery replacement, maintaining high charging efficiency even with positional offsets.
Implementation Method 1
An active capacitive stylus is provided, which may be wirelessly charged through a wireless charging transmitter... the receiver is used to receive a radio frequency signal... When the receiver is aligned with the transmission coil, the wireless charging transmitter is adapted to charge the active capacitive stylus
Data Source
AI summary
An active capacitive stylus including a pen body, a receiver, an insulator, and a shell is provided. The pen body has an axial direction. The receiver surrounds the pen body to receive a radio frequency signal. The receiver includes an annular body with two opposite first sides and two opposite second sides. The length of each first side is greater than that of each second side. The two first sides are parallel to the axial direction. Each second side has a first radius of curvature and a second radius of curvature, and the first radius of curvature is different from the second radius of curvature. The insulator is located between the receiver and the pen body. The shell is sleeved on the pen body and wraps around the receiver. A wireless charging system is also provided.