Pressure sensor for a digitizer pen

Details Pressure sensor for a digitizer pen Pressure sensor for a digitizer pen

2007-04-10

2007-04-10

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Stylus

C178S018010, C178S019010

Reexamination Certificate

active

10791973

ABSTRACT:
A digitizer pen (100) has a pressure sensor (104) that includes a flexible first printed component (600) and a flexible second printed component (700), on which are printed or otherwise disposed traces of non-carbon ink. The non-carbon ink on at least one of the printed components is a resistive non-carbon ink (606and706). The first printed component has a circular sensor section (602) that opposes a circular sensor section (702) of the second printed component. The non-carbon ink on the circular sensor section of at least one of the printed components forms a pattern of pie-shaped traces (711–716) symmetrical about a center (1000) of the circular sensor section. A stylus (130) transfers force from a writing tip (136) to the pressure sensor, at or near the center of the circular sensor section, either directly or through an elastomer (148), and presses the circular sensor sections together. The area of the non-carbon ink on one circular sensor section thereby pressed into intimate contact with the non-carbon ink on the other circular sensor section is proportional to the force. The pressure sensor has two terminals (901and902) electrically coupled to the inks on the circular sensor sections such that the electrical resistance between the terminals is proportional to the pressure. The electrical resistance is approximately the same when the stylus transfers a force at the center of the circular sensor section or when the stylus transfers the same force off-centered (1005). An electrical resistance versus force curve (1400) is selectable by preselecting the size or the shape, or both, of the ink traces of the pie-shaped pattern. The abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims pursuant to 37 C.F.R. §172(b).

REFERENCES:
patent: RE34095 (1992-10-01), Padula et al.
patent: 5357062 (1994-10-01), Rockwell et al.
patent: 5571997 (1996-11-01), Gray et al.
patent: 5581052 (1996-12-01), Padula et al.
patent: 5633471 (1997-05-01), Fukushima
patent: 6252182 (2001-06-01), Lai
patent: 6288711 (2001-09-01), Tanaka et al.

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