Process for manufacturing capacitive keyboards and new keyboards obtained by this process
First Claim
1. Process for manufacturing capacitive keyboards of the type comprising, on each side of an insulating material of small thickness, two matrix arrangements, one in lines and the other in columns, of areas associated two by two for forming capacitive studs able to be subjected to the influence of a key for causing a metal armature to draw near thereto, characterized by the succession of steps consisting in applying, on one face (2) of a relatively rigid insulating support (1), a first matrix arrangement of areas (3) with their respective conducting tracks (4) in lines (or columns), in applying a thin insulating layer (5) to this face thus provided with this arrangement such that the thickness of said insulating layer on said areas of said first matrix arrangement is less than or equal to 20 microns, then in positioning on said insulating layer (5) said second matrix arrangement of areas (6) with their respectively conducting tracks (7) disposed in columns (or in lines) whereby a capacitive coupling of respective areas of said two matrix arrangements with little hinderance by said insulating layer is provided.
2 Assignments
0 Petitions
Accused Products
Abstract
According to the process, there is applied to one face of a relatively rigid isolating support (1) a first matrix arrangement of areas (3) connected by conductor tracks of lines (4). Said arrangement is coated with a thin layer of isolating lacquer (5) and a second matrix arrangement of areas (6) is set in place on the lacquer layer with their conductor tracks of columns (7) to obtain, by bringing together an armature towards each stud comprised of two areas (3, 6), a capacitive connection.
-
Citations
10 Claims
- 1. Process for manufacturing capacitive keyboards of the type comprising, on each side of an insulating material of small thickness, two matrix arrangements, one in lines and the other in columns, of areas associated two by two for forming capacitive studs able to be subjected to the influence of a key for causing a metal armature to draw near thereto, characterized by the succession of steps consisting in applying, on one face (2) of a relatively rigid insulating support (1), a first matrix arrangement of areas (3) with their respective conducting tracks (4) in lines (or columns), in applying a thin insulating layer (5) to this face thus provided with this arrangement such that the thickness of said insulating layer on said areas of said first matrix arrangement is less than or equal to 20 microns, then in positioning on said insulating layer (5) said second matrix arrangement of areas (6) with their respectively conducting tracks (7) disposed in columns (or in lines) whereby a capacitive coupling of respective areas of said two matrix arrangements with little hinderance by said insulating layer is provided.
Specification