Tablet position digitizer
First Claim
1. A digitizer constituted by a tablet and a position indicator to determine coordinates indicated by said position indicator on said tablet, comprising:
- a set of coordinate determining conductor groups arranged on said tablet;
a first set of oscillation elements, having at least a first element and a second element, arranged on said tablet;
at least a second oscillation element coupled to said first set of oscillation elements, said second oscillation element having an input and an output wherein said input of said second oscillation element is connected to said first element of the first set of oscillation elements and said output of said second oscillation element is connected to said second element of the first set of oscillation elements; and
a third oscillation element arranged on said position indicator,wherein when said position indicator is placed at an arbitrary position on said tablet, said first set of oscillation elements, said second oscillation element, and said third oscillation element constitute an oscillator system to generate a coordinate signal such that the coordinates indicated by said position indicator are determined based on a plurality of signals generated in the coordinate determining conductor groups by causing magnetic fields and electric fields, generated by said position indicator when said oscillator system oscillates, to act on said coordinate determining conductors groups.
2 Assignments
0 Petitions
Accused Products
Abstract
In this digitizer, when the coil of the position indicator is placed near a plurality of conductors of the tablet, an oscillator arrangement is formed through the amplifier, and a position indicated by the position indicator is determined by detecting magnetic fields generated by the position indicator when the oscillator arrangement oscillates. In addition, when the position indicator is placed near the tablet, an oscillator arrangement is constituted by the position indicator and two conductors of the tablet at a timing at which the position of the position indicator is measured.
-
Citations
14 Claims
-
1. A digitizer constituted by a tablet and a position indicator to determine coordinates indicated by said position indicator on said tablet, comprising:
-
a set of coordinate determining conductor groups arranged on said tablet; a first set of oscillation elements, having at least a first element and a second element, arranged on said tablet; at least a second oscillation element coupled to said first set of oscillation elements, said second oscillation element having an input and an output wherein said input of said second oscillation element is connected to said first element of the first set of oscillation elements and said output of said second oscillation element is connected to said second element of the first set of oscillation elements; and a third oscillation element arranged on said position indicator, wherein when said position indicator is placed at an arbitrary position on said tablet, said first set of oscillation elements, said second oscillation element, and said third oscillation element constitute an oscillator system to generate a coordinate signal such that the coordinates indicated by said position indicator are determined based on a plurality of signals generated in the coordinate determining conductor groups by causing magnetic fields and electric fields, generated by said position indicator when said oscillator system oscillates, to act on said coordinate determining conductors groups. - View Dependent Claims (3, 4, 5, 6, 7, 8, 14)
-
-
2. A digitizer constituted by a tablet and a position indicator and designed to determine coordinates indicated by said position indicator on said tablet, comprising:
-
a plurality of first oscillation elements arranged at predetermined positions on said tablet; a second oscillation element with an input and an output; a selection means, which has respective connections that sequentially selects a set of first oscillation elements from said plurality of first oscillation elements, wherein a first selected oscillation element of said selected set of first oscillation elements is coupled to the input of the second oscillation element, and a second selected oscillation element of said selected set of first oscillation elements is coupled to the output of the second oscillation element; and a third oscillation element arranged on said position indicator, wherein when said position indicator is placed at an arbitrary position on said tablet, said selected set of first oscillation elements, said second oscillation element, and third oscillation element constitute an oscillator system, and the coordinates indicated by said position indicator are determined on the basis of outputs from the oscillation of said oscillator systems formed of a set of different first oscillation elements sequentially selected by said selection means. - View Dependent Claims (9, 10, 11, 12, 13)
-
Specification