×

Keyboard switch

  • US 4,503,294 A
  • Filed: 11/28/1983
  • Issued: 03/05/1985
  • Est. Priority Date: 12/30/1982
  • Status: Expired due to Fees
First Claim
Patent Images

1. A membrane keyboard including:

  • first electrical circuit means having a plurality of first switch contacts;

    second electrical circuit means having a plurality of second switch contacts, and defining a switch sheet;

    insulating spacer means between said first and second electrical circuit means, said spacer means having a plurality of openings at locations corresponding to the locations of said first and second switch contacts, said openings defining switch motion cavities and wherein said switch motion cavities define switch operational areas of varying size wherein at least one of said switch operational areas is smaller than said other of said switch operational areas; and

    at least one slit through said switch sheet disposed above at least one of said switch motion cavities which defines said smaller switch operational area wherein the force for actuating said smaller switch operational area is reduced.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×