Membrane switch apparatus having sequential bridging contact arrangement
Keyboard switch assembly having multilayer printed circuit structure
Keyboard switch assembly having foldable printed circuit board, integral spacer and preformed depression-type alignment fold
Flexible keyboard switch with integral spacer protrusions
Keyboard switch assembly with printed circuit board
Dual lateral switch device Patent #: 4301337
ApplicationNo. 06/465088 filed on 02/09/1983
US Classes:200/5A, With independent operators200/267, One layer (i.e., additional to its mounting)200/292, Printed circuit200/512, Membrane type200/86R, Treads361/680, Including keyboard support361/749Flexible board
ExaminersPrimary: Scott, J. R.
Attorney, Agent or Firm
International ClassesH01H 13/70 (20060101)
H01H 13/702 (20060101)
AbstractA spacerless switch circuit for use in multiple switch keyboards includes a first base member having a front surface and a second base member having a front surface in touching relationship against the front surface of the first base member. A plurality of first and second conductor traces are respectively deposited on the front surfaces of the first and second base members. An insulative layer is deposited over regions of either or both of the first and second conductor traces to insulate the conductor traces from each other when the front surfaces of the two base members are touching one another. One or more first switch contacts are deposited on the first base member and one or more facing second switch contacts are deposited on the second base member to define one or more on/off switches. At least one of the first switch contacts includes a first conductive pad and a first pressure sensitive layer applied over the first conductor pad so that a surface junction is formed between the first and second switch contacts where the surface junction is electrically nonconductive when the first contact noncompressively touches the facing second contact and is electrically conductive when the first contact compressively touches the facing second contact.