Watch Terminal Shielding Sheet Design for Wireless Charging
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Solution Overview
Problem
Wearable type terminals face challenges with limited space for diverse components, mutual interference between antenna and wireless charging coil, and deteriorated exterior design when the display unit is deactivated, along with battery capacity issues due to constant activation.
Innovation Solution
A watch type terminal design incorporating a metal structure antenna, a shielding sheet with omitted areas for the wireless charging coil and components, and a ring-shaped wireless charging coil with a first and second shielding portion to prevent thickness increase and improve electromagnetic compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding sheet is provided to cover the wireless charging coil and components, then electromagnetic interference is reduced, but the terminal becomes thicker
Solution Approach 1:
The patent extracts the shielding function from a traditional continuous shielding sheet and implements it through selective shielding only in areas where electromagnetic interference occurs between the wireless charging coil and specific components (main chip, connector, rear surface components). This eliminates the need for a complete shielding sheet, reducing overall thickness while maintaining EMI protection where needed.
Solution Approach 2:
The shielding sheet is designed with localized shielding portions only in specific areas where electromagnetic interference problems occur, rather than providing uniform coverage across the entire terminal. The shielding portions are strategically positioned to cover only the problematic interference zones between the wireless charging coil and sensitive components.
2Adaptability or versatility
If diverse components are loaded in the terminal, then functionality is improved, but space for arrangement becomes insufficient
Solution Approach 1:
The patent utilizes the vertical dimension (thickness direction) to arrange components and shielding structures. By positioning the shielding sheet with localized portions in specific vertical zones and arranging components in different vertical layers, the design accommodates diverse functionality within limited horizontal space while managing electromagnetic interference in the vertical dimension.
3Shape
If the display unit is always activated to maintain exterior design, then appearance is improved, but battery capacity is depleted faster
Solution Approach 1:
The display unit operates periodically rather than continuously - it is activated only when needed for user interaction or to display information, and deactivated during periods of non-use. This periodic operation maintains the aesthetic appearance when required while significantly reducing battery consumption compared to continuous activation.
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 enhances wireless charging efficiency, reduces electromagnetic noise, and maintains a sleek design by avoiding overlap between the wireless charging coil and components, thereby preventing the terminal from becoming thick and improving user safety.
Implementation Method 1
a shielding sheet disposed on a rear surface of the main board
Implementation Method 2
a wireless charging coil provided in the internal space
Data Source
AI summary
A mobile terminal of the present invention comprises: a front case having a display unit disposed on a front surface thereof; a rear case coupled to the front case at the rear of the front case to form an inner space; a main board located in the inner space and comprising mounted components coupled to a surface thereof; a shielding sheet laminated on a back surface of the main board; and a wireless charging coil located in the inner space, wherein the shielding sheet has empty spaces at positions where the wireless charging coil and the mounted components overlap with each other. Accordingly, the main body of the mobile terminal can be prevented from becoming thick by forming the shielding sheet for enhancing the performance of the wireless charging coil in a shape that does not overlap with the wireless charging coil and the mounted components at the same time.