Browse Prior Art Database

Electronic Solution for "Beat the Shift" on Membrane or Capacitance Keyboards

IP.com Disclosure Number: IPCOM000035289D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Maddux, TP: AUTHOR

Abstract

This invention is a software or electronic hardware modification to help keyboard users with a problem identified as "beat the shift". This modification can be performed on both membrane and capacitance keyboards, since both technologies scan the keyboard to determine which switch position(s) are closed.

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Electronic Solution for "Beat the Shift" on Membrane or Capacitance Keyboards

This invention is a software or electronic hardware modification to help keyboard users with a problem identified as "beat the shift". This modification can be performed on both membrane and capacitance keyboards, since both technologies scan the keyboard to determine which switch position(s) are closed.

"Beat the shift" is a condition in which two upper case characters are typed when only one was desired. For example, the word "The" comes out "THe", or stated another way, the second character was upper case when only the first character was desired as upper case.

Human factors testing has shown how operators produce this type of error. Normally, the second key, in this case the "h", is made some 100 to 150 milliseconds after the shift is released. However, this time may vary from several milliseconds down to almost zero. This is fine as long as it stays in the correct order. However, in some cases, the operator is releasing the shift key several milliseconds after the second character is made. The machine obviously prints the upper case since the shift is still depressed.

It has been found that in these cases the shift key is depressed for only as little as 1-25 milliseconds during the initial portion of this second stroke.

The solution to a large percentage of these errors is accomplished by changing the software or electronic hardware relating to the keyboard electronics. Currently,...