×

Process for manufacturing capacitive keyboards and new keyboards obtained by this process

  • US 4,743,464 A
  • Filed: 12/04/1985
  • Issued: 05/10/1988
  • Est. Priority Date: 02/13/1984
  • Status: Expired due to Fees
First Claim
Patent Images

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.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×