公开(公告)号：CA1078490A

公开(公告)日：1980-05-27

申请号：CA268525

申请日：1976-12-22

Applicant: IBM

Inventor： DYM HERBERT ,  LOWY PAUL ,  SALYER GREG

IPC: G06F3/044 ,  G06F3/033 ,  G06F3/041 ,  G08C21/00

Abstract: TABLET WITH IMPROVED PEN HEIGHT COMPENSATION An improved operation is provided for a graphic tablet of the type in which a pen is capacitively coupled to sets of X dimension wires and Y dimension wires that are digitally activated to produce a pen signal that signifies the position of the pen on the tablet. Compensation is provided for variations in the pen signal that are attributable only to differences in the height of the pen above the tablet as the pen is operated over intervening layers of paper of various thicknesses. The drivers that activate the tablet are controlled to establish a sequence of different activation patterns and a corresponding sequence of analog pen signals. These signals are operated on to produce a pen position address that is substantially compensated for variations in pen height.

公开(公告)号：DE2656721A1

公开(公告)日：1977-06-30

申请号：DE2656721

申请日：1976-12-15

Applicant: IBM

Inventor： DYM HERBERT ,  LOWY PAUL ,  SALYER GREG

IPC: G06F3/044 ,  G06F3/033 ,  G06F3/041 ,  G06F3/00

Abstract: An improved operation is provided for a graphic tablet of the type in which a pen is capacitively coupled to sets of X dimension wires and Y dimension wires that are digitally activated to produce a pen signal that signifies the position of the pen on the tablet. Compensation is provided for variations in the pen signal that are attributable only to differences in the height of the pen above the tablet as the pen is operated over intervening layers of paper of various thicknesses. The drivers that activate the tablet are controlled to establish a sequence of different activation patterns and a corresponding sequence of analog pen signals. These signals are operated on to produce a pen position address that is substantially compensated for variations in pen height.

公开(公告)号：FR2313662A1

公开(公告)日：1976-12-31

申请号：FR7613463

申请日：1976-04-29

Applicant: IBM

Inventor： DYM HERBERT ,  KAMBIC STANLEY F ,  LOWY PAUL ,  SALYER GREG

IPC: G06F3/033 ,  G06F3/044 ,  G01D7/10 ,  G01D15/00

Abstract: The graph table is provided with perpendicular X and Y coordinate lines, with a control circuit for selectively supplying an AC signal to the coordinate lines, so as to excite a particular line. The stylus is positioned on the table so that it can be electrically coupled to the coordinate lines in order to receive the AC signal. The control circuit is used to provide a selected excitation configuration of the lines in a given dimension, with means for receiving the signal from the stylus to form a position address for the stylus. Pref. the control circuit allows the lines on one side of the stylus position to be excited, while the lines on the other side of the stylus position are not excited.