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Browse Prior Art Database

Keyboard Tester

IP.com Disclosure Number: IPCOM000041998D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03

Publishing Venue

IBM

Related People

Authors:
Duffy, DD Floyd, RE McDermott, LF Shyrock, RS Smith, HC [+details]

Abstract

The force detector on the keyboard tester requires a near linear waveform detector. Waveform detectors cannot detect near linear waveforms. Ideally, the force applied to a key button on the keyboard should result in a linear waveform, as shown in Fig. 1, where P is the point at which the key spring buckles and a force value must be captured. Due to sticking, spring variations, etc., the actual waveform seen by the tester is approximated in Fig. 2. Using the standard peak detector, point A or B would be sensed as the "peak" value, stopping the search before the real peak is found at point P. The peak differential in the waveform is small at points A and B when compared to the value at P. This difference is the key to the near linear peak detector operation.