Digitizer tablet with coarse and fine position determination
US4560830A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1983 |
| Grant date | Dec 24, 1985 |
| Priority date | — |
| Expiry date | Dec 22, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0441
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A grid of electrical conductors for locating the position of a stylus utilizes a reduced number of line drivers. The grid utilizes twice as many conductors as required by conventional grids for a given resolution. The conductors are divided into coarse and fine sets which are interleaved and coextensive in the long dimension of the conductors. The coarse set is divided into subsets which consist of a predetermined number of conductors in close proximity to each other, adjacent coarse conductors being separated by only one fine conductor. The fine set is divided into a number of subsets equal to the number of conductors in each coarse subset. The number of conductors in each fine subset equals the number of coarse subsets. Each of the conductors of the fine subsets is spaced one from the other by a number of fine conductors equal to the number of coarse subsets. The conductors of each subset are connected to each other and to the output of a single driver. The position of the stylus is located by scanning the coarse conductors to determine a coarse position and by scanning the fine conductors to determine a fine position. The coarse and fine positions are combined to produce the loc…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.