Browse Prior Art Database

Keyboard Using Simplified Construction Techniques

IP.com Disclosure Number: IPCOM000102598D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 3 page(s) / 110K

Publishing Venue

IBM

Related People

Abell Jr, WA: AUTHOR [+5]

Abstract

Disclosed is a keyboard which integrates the top enclosure with the top frame and integrates the bottom enclosure with the base plate. This keyboard also employs snap fasteners to join the electronics card to the switch matrix circuit and to join the top and bottom enclosures together. This construction technique greatly simplifies the keyboard assembly and enables lower cost as well as a smaller size.

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Keyboard Using Simplified Construction Techniques

       Disclosed is a keyboard which integrates the top
enclosure with the top frame and integrates the bottom enclosure with
the base plate.  This keyboard also employs snap fasteners to join
the electronics card to the switch matrix circuit and to join the top
and bottom enclosures together.  This construction technique greatly
simplifies the keyboard assembly and enables lower cost as well as a
smaller size.

      Referring to Fig. 1, the bottom enclosure 1 forms the base
which supports the switch matrix assembly.  The switch matrix
assembly is composed of two layers 3 and 4 containing contacts and
connecting circuitry separated by an insulating spacer layer 5 shown
in the figure in intimate contact with the drive layer 4.  The bottom
enclosure also contains snap fingers 2 which work in conjunction with
corresponding slots in the top enclosure 6 to fasten the keyboard
together.  The top enclosure 6 has integrally molded into it the
keybutton housings 7 and pockets on its underside to accept and
locate the pivot plate and spring assemblies 8 which provide the
actuation to close the switches located on the switch matrix
assembly.  Such actuation is accomplished by depression of keybutton
9 causing spring 10 to buckle causing the resultant rotation of pivot
plate 11 which, in turn, rocks onto the switch contacts to effect the
switch closure.

      Connection of the switch matrix assembly to the controlle...