Telegraphy – Systems – Position coordinate determination for writing
Reexamination Certificate
2011-07-19
2011-07-19
Shalwala, Bipin (Department: 2629)
Telegraphy
Systems
Position coordinate determination for writing
C178S018010, C178S019010, C345S177000, C345S179000
Reexamination Certificate
active
07982141
ABSTRACT:
A pen includes a first speaker that outputs a first signal and a second speaker that outputs a second signal. The first and second speakers are located away from a tip of the pen at respectively different locations. The second signal is delayed with respect to the first signal by a time shorter than a cycle of the first signal. An interpolation time is set between the times of generation of the first and second signals. Interpolated positions of the first and second speakers at the interpolation time are estimated, and position of the tip of the pen is calculated from the interpolated positions of the first and second speakers.
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Beppu Tomohiko
Furuta Toshiyuki
Hamada Yuuta
Horikawa Hirofumi
Suga Satoshi
Hegarty Kelly
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Ricoh Company Limited
Shalwala Bipin
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