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KEYBOARDS' CLASSIFICATION:     the basic data for the choice of a model

SILK SCREENED CIRCUIT
unsolderable 10µm silver tracks
finishing: graphite (optional)
 
PRINTED CIRCUIT
solderable 35 µm copper tracks
finishing: Sn/Pb Au/Ni (optional) 
 
flexible          series 1T rigid            series 2T
circuit ground: circuit ground:
125µm polyester backelite,epoxy-glass
thermostabilized polycarbonate, glass
  any thickness
   
connections: connections:
crimped connectors rivets, screws
ZIF connectors spring (front side)
   
   
   
type: type:
1T  flat overlay 2T  flat overlay
1TF embossed keys 2TF embossed keys
1TC metal domes
       under flat overlay
2TC metal domes
       under flat overlay
1TCF embossed keys
         and metal domes
2TCF embossed keys
         and metal domes
1TB transparent keys
      (for back-lit keyboards)
2TB trasparent keys
      (for back-lit keyboard)
1TBF transparent keys
         embossed
2TBF trasparent keys
         embossed
  2TG silicon rubber keypads
flexible          series 3T rigid            series 4T
circuit ground: circuit ground:
200µm polyester FR2 o FR4 1,6 mm
   
   
   
connections: connections:
solderable pads solderable pads
crimped connectors male strip
ZIF connectors terminal board
  rivets, screws
   
type: type:
3T  flat overlay 4T  flat overlay
3TF embossed keys 4TF embosed keys
3TC metal domes
       under flat overlay
4TC metal domes
       under flat overlay
3TCF embossed keys
         and metal domes
4TCF embossed keys
         and metal domes
 
 
 
 
 
 
 
 
  4TG silicon rubber keypads