Browse Prior Art Database

Strain Gauge-Based Computer Keyboard

IP.com Disclosure Number: IPCOM000103109D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 33K

Publishing Venue

IBM

Related People

Overman, TM: AUTHOR

Abstract

This article discloses a strain gauge-based computer keyboard. Referring to the Figure, each key 10 is made from a base 12 of an elastic material, such as a strip of metal or plastic. Base 12 has a curve along its length which will cause a slight click upon depression of the key. The spring constant and radius of curvature can be determined based upon the size of the key 10 and the resistance desired.

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Strain Gauge-Based Computer Keyboard

      This article discloses a strain gauge-based computer keyboard.
Referring to the Figure, each key 10 is made from a base 12 of an
elastic material, such as a strip of metal or plastic.  Base 12 has a
curve along its length which will cause a slight click upon
depression of the key.  The spring constant and radius of curvature
can be determined based upon the size of the key 10 and the
resistance desired.

      Each base 12 has a strain gauge 14 fastened at or near the
point that incurs the most bending strains when the key is pressed.
The change in resistance of the strain gauge is an indication that
the key has been depressed.  The keys as disclosed in this invention
can be assembled in any desired configuration, and would use
well-known circuits for detecting and measuring the changes in
resistance. Keyboards implementing the key structure disclosed herein
can be used in personal computers, terminals, calculators, etc.

      Disclosed anonymously.