Trackpad pen for use with computer touchpad

Details Trackpad pen for use with computer touchpad Trackpad pen for use with computer touchpad

2005-08-24

2009-11-03

Nguyen, Chanh (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Stylus

C178S019030

Reexamination Certificate

active

07612767

ABSTRACT:
A pen or stylus for use with a finger activated computer touchpad uses capacitively coupled voltage signals to simulate the capacitive effect of a finger on the touchpad. In addition, the pen has buttons that can be utilized to capacitively couple control signals to the touchpad that are interpreted by application software as specific user-defined inputs. The pen has a conductive tip that is placed into contact with the touchpad. By biasing the touchpad electrodes with a properly timed voltage signal, the pen alters the charging time of the electrodes in the touchpad. This alteration in charging time is interpreted by the touchpad as a change in capacitance due to the presence of a user's finger. Thus, the pen can be used with touchpads that were designed to only detect finger movements.

REFERENCES:
patent: 5365461 (1994-11-01), Stein et al.
patent: 5528002 (1996-06-01), Katabami
patent: 5790106 (1998-08-01), Hirano et al.
patent: 5945980 (1999-08-01), Moissev et al.
patent: 6262580 (2001-07-01), Wu
patent: 2005/0162411 (2005-07-01), Berkel van

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