| US 7,528,825 B2 | ||
| Input pen and input device | ||
| Satoshi Sakurai, Shinagawa (Japan); Nobuo Yatsu, Shinagawa (Japan); and Keita Harada, Shinagawa (Japan) | ||
| Assigned to Fujitsu Component Limited, Tokyo (Japan) | ||
| Filed on Dec. 08, 2004, as Appl. No. 11/6,743. | ||
| Claims priority of application No. 2003-408548 (JP), filed on Dec. 08, 2003. | ||
| Prior Publication US 2005/0122319 A1, Jun. 09, 2005 | ||
| Int. Cl. G06F 3/033 (2006.01); G09G 5/00 (2006.01) | ||
| U.S. Cl. 345—179 [345/156] | 5 Claims |
| 1. An input pen in use for an input device comprising:
a first member;
a second member that moves together with a pen tip and touches the first member; and
a pen pressure detecting circuit that detects an amount of a pen pressure that is applied to the pen tip, based on a touch
area between the first member and the second member,
wherein the first member is a spring that has a diameter of spirals that becomes smaller as a distance from the pen tip increases
and varies the touch area according to a movement of the pen tip; and
the second member is a resistance film having a resistance that depends on the touch area.
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