Ceramic Back Cover Wireless Charging Integration
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Solution Overview
Problem
Existing portable electronic devices face challenges with thick wireless charging coils due to wire wrapping and metal back covers that affect signal transmission and increase manufacturing complexity and costs, while also having unsatisfactory wireless charging efficiency.
Innovation Solution
A ceramic back cover integrates a wireless charging RX coil with grooves for electrode extensions, eliminating the need for wire pressing and combining with a main antenna and NFC antenna, using zirconium or aluminum oxide ceramics with electroplating and silver ink firing for efficient heat dissipation and signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a wireless charging coil and magnetic plate are adhered to be fixed on a back cover, then wireless charging function is achieved, but inner space is occupied and product cannot be miniaturized and thinned
Solution Approach 1:
The patent integrates the wireless charging RX coil directly into the ceramic back cover by forming conductive patterns (traces) on the inner surface of the back cover, eliminating the need for separate coil components and magnetic plates. This merging of functions allows the back cover to serve both structural and wireless charging purposes, reducing overall device thickness while maintaining charging efficiency
Solution Approach 2:
The ceramic back cover is designed to perform multiple functions: it serves as the structural back cover, the antenna substrate, and the wireless charging receiver. The conductive patterns formed on the back cover enable it to function as both the structural element and the electromagnetic receiving element, achieving multi-functionality that reduces component count and device thickness
2Length of moving object
If wire of the coil is wrapped and leading-out end is pressed on the coil, then coil connection is achieved, but thickness of the coil is doubled
Solution Approach 1:
The patent replaces the traditional mechanical wire-wrapping and pressing method with a ceramic-based conductive pattern formation process. Conductive traces are directly formed on the inner surface of the ceramic back cover through printing or sintering techniques, eliminating the need for separate wire connections and pressing operations. This substitution dramatically reduces coil thickness and simplifies the manufacturing process
Solution Approach 2:
The invention changes the fundamental parameter of how electrical connections are made in the coil structure. Instead of using thick pressed wire connections, the patent uses thin conductive traces formed by ceramic printing technology, changing the connection method from mechanical pressing to ceramic-based conductive patterning, thereby reducing thickness while maintaining electrical functionality
3Shape
If metal frame and metal back cover are used for fashion, then aesthetic appearance is improved, but signal transmission is affected
Solution Approach 1:
The patent uses ceramic material for the back cover instead of traditional metal materials. Ceramic provides both the desired aesthetic appearance (can be made to look like metal or have unique textures) and the critical advantage of being non-conductive, which allows signal transmission without interference. This material substitution resolves the contradiction between appearance and signal transmission
4Length of moving object
If LDS antenna is fixed on plastic support by using screws, then antenna mounting is achieved, but thickness of the product is increased
Solution Approach 1:
The patent integrates the antenna directly into the ceramic back cover by forming conductive patterns on the back cover surface, eliminating the need for separate plastic supports and screw mounting structures. The back cover itself becomes the antenna substrate, merging the structural support function with the antenna function, thereby reducing thickness and simplifying the manufacturing process
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 reduces device thickness, enhances wireless charging efficiency, simplifies manufacturing, and ensures signal transmission without the need for segmented metal frames, offering higher quality and lower costs.
Implementation Method 1
using zirconium or aluminum oxide ceramics with electroplating and silver ink firing for efficient heat dissipation
Implementation Method 2
using zirconium or aluminum oxide ceramics with electroplating and silver ink firing
Implementation Method 3
a wireless charging RX coil is disposed on an inner surface of the ceramic back cover
Data Source
AI summary
Disclosed is a ceramic back cover used in an electronic device and an electronic device having the ceramic back cover. A wireless charging RX coil is disposed on an inner surface of the ceramic back cover, a groove used for disposing the wireless charging RX coil is in an intermediate region of the inner surface of the ceramic back cover, and at least two wireless charging RX electrode grooves that extend outward separately from an intermediate region of the groove and a marginal region of the groove are formed on the inner surface of the ceramic back cover. Electrodes formed in the at least two wireless charging RX electrode grooves are used as leading-out ends of the wireless charging RX coil disposed in the groove, and two ends of the wireless charging RX coil are welded at the leading-out ends.