Flexible printed circuit and electrical connection therefor

A flexible printed circuit comprising:

• a flexible insulation sheet having a plurality of conductive strips thereon each terminating in a conductive pad;
• said pads being arranged in a non-linear pattern;
• each said pad and the area of the insulation sheet underlying said pad being deformed to provide a hollow, upwardly extending contact projection defining a cavity therebelow, said projection having a generally hemispherical configuration;
• and
• a layer of elastomeric material underlying said sheet in the region of said projections and embodying upwardly protruding points extending into said cavities.

A flexible printed circuit comprising:

• a flexible insulation sheet having a planar area;
• a plurality of conductive strips on said sheet extending into said planar area;
• each said conductive strip having an upwardly extending contact projection thereon in said planar area, said projection having a generally hemispherical configuration;
• said projections being arranged in said planar area in a non-linear pattern;
• and
• an elastomeric member underlying said sheet at least in the region of said contact projections.

A flexible printed circuit comprising:

• a flexible insulation sheet having at least one conductive strip thereon terminating in a conductive pad;
• said pad and the area of the insulation sheet underlying said pad being deformed to provide a hollow, upwardly extending contact projection defining a cavity therebelow, said projection having a generally hemispherical configuration;
• a layer of elastomeric material underlying said sheet in the region of said projection and embodying an upwardly protruding point extending into said cavity;
• a second flexible insulation sheet above said first-mentioned sheet and having an opening therein aligned with said projection, said projection extending upwardly through said opening and above the upper surface of said second sheet;
• a second conductive strip on said second sheet terminating in a second conductive pad remote from said opening;
• said second pad and the areas of said first and second insulation sheets underlying said second pad being deformed to provide a second hollow, upwardly extending projection defining a second cavity therebelow, said second projection having a generally hemispherical configuration;
• and
• said elastomeric layer embodying a second upwardly protruding point extending into said second cavity.