Switch Device Coil Antenna Layout for Wireless Power
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Solution Overview
Problem
Existing switch devices with coil antennas for wireless power feeding to portable devices face a challenge in increasing the intensity of the radio wave emitted while maintaining a compact size, as the outside diameter of the coil antenna is typically smaller than the control button, limiting the efficiency of wireless power transfer.
Innovation Solution
The switch device design includes a coil antenna with an outside diameter matching the control button, positioned rearwardly and coaxially with it, allowing for a constant-diameter cylindrical shape and increased freedom in component layout, enhancing the intensity of the radio wave emitted without increasing the device's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the coil antenna's outside diameter is made smaller than the control button, then the device size is reduced, but the radio wave intensity becomes too small for efficient wireless power feeding
Solution Approach 1:
The patent positions the coil antenna in the longitudinal dimension (rearward of the control button) rather than reducing its radial dimension. By making the antenna's outside diameter substantially the same as the control button's outside diameter and placing it rearwardly, the design utilizes the longitudinal space to achieve both compact radial profile and sufficient antenna size for effective wireless power transfer.
2Power
If the coil antenna's outside diameter is increased to improve radio wave intensity, then wireless power feeding efficiency improves, but the device size increases radially
Solution Approach 1:
The patent resolves this contradiction by shifting the design approach from radial expansion to longitudinal positioning. The coil antenna is positioned rearward of the control button with its outside diameter substantially matching the control button's diameter, thereby achieving effective wireless power transfer without increasing the radial footprint of the device.
Solution Approach 2:
The coil antenna is nested within the cylindrical housing in a rearward position, utilizing the internal longitudinal space of the device. This nesting approach allows the antenna to have sufficient dimensions for effective operation while being contained within the overall device envelope, preventing external size increase.
3Volume of moving object
If the coil antenna is positioned with outside diameter smaller than control button, then radial size is reduced, but the layout freedom of components is constrained
Solution Approach 1:
By positioning the coil antenna rearward of the control button with matching diameters, the patent creates a constant-diameter cylindrical configuration. This approach maintains compact radial dimensions while providing increased layout freedom, as components can be arranged along the longitudinal axis without radial interference constraints.
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 configuration effectively increases the radio wave intensity for efficient wireless power feeding while maintaining a compact device size, allowing for reliable operation and aesthetic enhancements through integrated light-emitting elements.
Implementation Method 1
the coil antenna induces an electromotive force in a transponder of the portable device that is held in the vicinity of the control button
Data Source
AI summary
A switch device includes a circuit board disposed in a tubular holder case, a control button disposed for movement along the longitudinal directions of the holder case, the control button being actuated by pressing from outside of the switch device, and a switch unit mounted on the circuit board, the switch unit being actuated in response to rearward movement of the control button by pressing. A coil antenna is disposed rearwardly of the control button and has an outside diameter which is substantially the same as an outside diameter of the control button.