Four button cursor and method for digitizing tablet

Details Four button cursor and method for digitizing tablet Four button cursor and method for digitizing tablet

1987-01-23

1988-05-31

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

363 60, 307264, G08C 2100

Patent

active

047482958

ABSTRACT:
A cordless four button cursor unit for accurately digitizing points along a digitizing tablet surface has an insulative housing including four buttons, each shaped as a quadrant of a circle and arranged about a hub. The hub acts as a stationary support from which an operator's fingers can conveniently "roll" to actuate any of the buttons. An antenna loop integral with a printed circuit board extends forward of the housing and subtends a cross hair on the bottom surface of a transparent substrate. A pair of conductive touch plates on opposite sides of the housing are short circuited by the resistance of an operator's hand, enabling an oscillator to effectuate operation of the cursor unit, causing the antenna to transmit electrostatic signals of frequencies representing button commands. The capacitance of the operator's body adds to the ground plane capacitance, so that transmission of electrostatic signals by the ground plane to the digitizing tablet is avoided. When the opeator's hand breaks contact with the touch plates, the oscillator is disabled before data errors can be produced by the resulting decrease in gound plane capacitance.

REFERENCES:
patent: 4194084 (1980-03-01), Hetzel
patent: 4600807 (1986-07-01), Kable
patent: 4639547 (1987-01-01), Jacob-Grinschgl et al.

Affiliated with

Also associated with

Rating

Four button cursor and method for digitizing tablet does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Four button cursor and method for digitizing tablet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Four button cursor and method for digitizing tablet will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1875749