公开(公告)号：US3627927A

公开(公告)日：1971-12-14

申请号：US3627927D

申请日：1969-11-24

Applicant: SANDERS ASSOCIATES INC

Inventor： SCHMITZ HERBERT E ,  BLEAU ROBERT A

IPC: H01H13/702 ,  H01H13/785 ,  H01H13/807 ,  H04L15/16

CPC classification number: H01H13/807 ,  B41J5/08 ,  H01H13/702 ,  H01H13/785 ,  H01H2201/026 ,  H01H2203/032 ,  H01H2207/024 ,  H01H2209/002 ,  H01H2215/002 ,  H01H2217/018 ,  H01H2219/028 ,  H01H2221/026 ,  H01H2221/042 ,  H01H2223/002 ,  H01H2223/034 ,  H01H2223/036 ,  H01H2225/008 ,  H01H2225/022 ,  H01H2229/028 ,  H01H2229/034 ,  H01H2239/05

Abstract: A monolithic keyboard constructed in layers with inexpensive materials and which has no conventional moving parts is disclosed. In one embodiment, the layers include a bottom or first layer of conductive material, a second layer of spongy material with holes cut therein, and a third layer of flexible printed circuit. This flexible printed circuit includes a sheet of insulating material with conductive pads placed thereunder in registration with the holes in the spongy material. Key symbols are etched on or printed over the conductive pads thereby indicating the placement of the keys. Depressing the key causes contact to be made between the respective pad and the first layer of conductive material. The spongy material gives the operator the ''''touch'''' of a standard typewriter keyboard.