Wireless Stylus Pen Power Management via Induction
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Solution Overview
Problem
Conventional stylus pens require battery replacement or external charging, which is inconvenient for users, as they lack a method for wireless power transmission.
Innovation Solution
A coordinate indicating device that wirelessly receives drive power from a coordinate measuring device using induction, resonance, or electric field coupling schemes, storing it in a battery for powering actuators that provide vibration or frictional forces, eliminating the need for battery replacement or external charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a battery is used to power the stylus pen, then the actuator can provide vibration or frictional force, but the battery requires replacement or external charging which reduces user convenience
Solution Approach 1:
The patent implements periodic wireless power transmission from the coordinate measuring device to the stylus pen. The power is transmitted in periodic cycles through electromagnetic induction, allowing the battery to be recharged automatically during use without requiring user intervention for battery replacement or external charging.
Solution Approach 2:
The stylus pen system performs self-charging through wireless power transmission. When the stylus pen is brought near the coordinate measuring device, the battery is automatically recharged without requiring user action to connect external chargers or replace batteries, making the system serve itself.
2Ease of operation
If wireless power transmission is implemented in the stylus pen, then battery replacement and external charging are eliminated, but the device complexity increases due to additional power reception and management components
Solution Approach 1:
The patent combines the power transmission and coordinate measurement functions into a single integrated system. The coordinate measuring device simultaneously performs measurement and wireless power transmission, while the stylus pen receives both measurement signals and power through its electromagnetic resonance components, reducing overall system complexity.
Solution Approach 2:
The electromagnetic resonance components in the stylus pen serve multiple functions: they enable coordinate indication through electromagnetic wave emission and simultaneously function as power reception coils for wireless charging. This multi-functionality eliminates the need for separate components, reducing device complexity.
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 continuous operation of stylus pens without battery replacement or external charging, enhancing user convenience by providing a seamless writing experience through wireless power transmission.
Implementation Method 1
Power transmission based on electromagnetic induction transmits power between a primary coil and a secondary coil. Once a magnet moves in a coil, an induced current is generated
Implementation Method 2
the resonance scheme, Soljacic, a professor at the Massachusetts Institute of Technology (MIT), announced in 2005 a system in which electricity is wirelessly transferred using a resonance-based power transmission principle
Implementation Method 3
a rectifier for rectifying the wirelessly received drive power into Direct Current (DC) drive power
Implementation Method 4
the EMR pen may include a condenser and a loop, and may emit the absorbed electromagnetic waves in a predetermined frequency
Implementation Method 5
an actuator for outputting at least one of preset vibration, frictional force, and electrostatic force, based on relative positions of the coordinate measuring device and the coordinate indicating device
Implementation Method 6
the stylus pen provides a frictional force or vibration to the user to allow the user to experience an environment similar to an actual writing environment
Data Source
AI summary
A coordinate indicating device which inputs coordinates to a coordinate measuring device is provided. The coordinate indicating device includes a power receiver for wirelessly receiving drive power from the coordinate measuring device, a rectifier for rectifying the wirelessly received drive power into Direct Current (DC) drive power, a battery for storing the rectified drive power, an actuator for outputting at least one of preset vibration, frictional force, and electrostatic force, based on relative positions of the coordinate measuring device and the coordinate indicating device by using the rectified drive power provided from the battery, a coordinate indicator for indicating coordinates at predetermined coordinates on the coordinate measuring device, and a shielding portion for shielding the coordinate indicator.