US4788384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for two-dimensional localization of events that generate current on a resistive surface
Assignee: ETBALISSEMENT PUBLIC CENTRE NATIONAL de la RECHERCHE SCIENTIFIQUE 15 QUAI ANATOLE FRANCE 75007 PARIS (FRANCE)
•
Filing: 1987-12-17
•
Granted: 1988-11-29
•
Expires: 2007-12-17
Abstract
Abstract Electrodes are placed at the periphery of a resistive surface to pick up a current generated at a point on the resistive surface. Each electrode is connected to at least three summing lines via respective resistors each having a fixed resistance value which is predetermined as a function of the summing line and of the electrode in such a manner as to obtain analog signals from at least two of the summing lines which are linear functions of respective co-ordinates (with respect to a predetermined co-ordinate system) of a point on the resistive surface at which current is generated.
Inventors
- 👤 Roger Bruere-Dawson
- 👤 Marcel Froissart
- 👤 Bernard M. Marechal
- 👤 Marcio N. DeSouza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:48
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/045; G01; G01B; G01B7/00; G01B7/004
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
A device for two-dimensional localization of current-generating events on a resistive surface, the device comprising: a resistive surface; a plurality of electrodes fixed to the resistive surface around its periphery in order to pick up currents generated by injecting current or electric charge into points on the resistive surface; and at least three current summing lines connected to the electrodes via discrete resistive components in such a manner as to obtain analog signals on said summing lines whose amplitudes are functions of the co-ordinates of said points in a predetermined reference co-ordinate system; the device including the improvement whereby: each of said electrodes is connected by means of respective resistive components to at least three summing lines in such a manner that at least two of the said lines deliver analog signals whose amplitudes are substantially linear functions of the desired co-ordinates.
Claim 2
Independent Claim
142 words
A device for two-dimensional localization of current-generating events on a resistive surface, the device comprising: a resistive surface; a plurality of electrodes fixed to the resistive surface around its periphery in order to pick up currents generated by injecting current or electric charge into points on the resistive surface; and at least three current summing lines connected to the electrodes via discrete resistive components in such a manner as to obtain analog signals on said summing lines whose amplitudes are functions of the co-ordinates of said points in a predetermined reference co-ordinate system; the device including the improvement whereby: each of said electrodes is connected by means of respective resistive components to at least three summing lines in such a manner that at least two of the said lines deliver analog signals whose amplitudes are substantially linear functions of the desired co-ordinates.
Claim 3
Dependent Claim
42 words
A device according to claim 1, wherein the number of electrodes is selected in such a manner that the distance between successive pairs of adjacent electrodes is no greater than the acceptable width of a peripheral distortion margin on the resistive surface.
Claim 4
Dependent Claim
11 words
A device according to claim 2, having at least 16 electrodes.
Claim 5
Dependent Claim
43 words
A device according to claim 1, wherein the signal obtained on one of said summing lines varies as a linear function of one co-ordinate and the signal obtained on another of said summing lines varies as a linear function of the other co-ordinate.
Claim 6
Dependent Claim
40 words
A device according to claim 4, having four summing lines, wherein the signals obtained on the summing lines are the same linear functions respectively of: a first co-ordinate, minus said first co-ordinate, the other co-ordinate, and minus said other co-ordinate.
Claim 7
Dependent Claim
33 words
A device according to claim 5, including means for generating two analog signals whose amplitudes are proportional to the co-ordinates by performing a linear combination of the signals obtained on the summing lines.
Claim 8
Dependent Claim
57 words
A device according to claim 1, wherein the sum of the conductances connecting any of the electrodes to the summing lines has a predetermined fixed value G such that R.sub.□ is greater than or of the same order as: (1/G); where R.sub.□ is the surface resistivity of the resistive surface and N is the number of electrodes.
Claim 9
Dependent Claim
38 words
A device according to claim 7, wherein the signals obtained on the summing lines are amplified by means of amplifiers having respective input impedances Z such that Z is less than or of the same order as: ##EQU1##
Claim 10
Dependent Claim
12 words
A device according to claim 1, wherein the resistive surface is disk-shaped.
Claim 11
Dependent Claim
93 words
A device according to claim 9, wherein the conductance G(n, 1) of the resistive connection between an electrode having θ n as its polar co-ordinate angle in said system of reference co-ordinates, and a summing line intended to provide a signal which is a linear function of the co-ordinate of a point localizing an event relative to an axis whose polar co-ordinate is θ 1 in said system of reference co-ordinates, has a value which is selected to be substantially equal to K(1+cos(θ n -θ 1 )), where K is a predetermined constant.
Claim 12
Dependent Claim
14 words
A device according to claim 1, wherein the resistive surface is rectangular in shape.
References Cited (Backward Citations)
GB1168427A
Cited
FR2181350A5
Cited
US3798370A
Cited
US4129747A
Cited
FR2463955A1
Cited
JPS5899889A
Cited
FR2522406A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |