This publication disclosed an active stylus wireless charging method on notebook PCs
or tablet PC systems. The design target to improve active stylus charging design when
compared with traditional micro USB or USB type-C charging method. The new design
will take advantage of magnet attraction force to attract flexible mounted pogo pins to
charge active stylus automatically. When active stylus is magnetically attached to
notebook PC or tablet PC, the correspond magnet inside notebook PC or tablet PC will
be attracted and pull out the pogo pins outward to charge active stylus. When the active
pen is removed from notebook PC or tablet PC, the pogo pins will retract to default
parking position inside the systems. The new design enabled active stylus charging
without additional USB cable and provide better user experience on active stylus.
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INC, HP, "ACTIVE STYLUS WIRELESS CHARGING DESIGN", Technical Disclosure Commons, (October 05, 2018)