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Pressure-Sensitive Key

IP.com Disclosure Number: IPCOM000034700D
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Tokuda, S: AUTHOR

Abstract

This article describes a pressure-sensitive cursor direction key to improve usability as a pointing device, wherein variable key pressure provides variable cursor speed on a display. Prior key output is binary, such as ON and OFF (pressed/released), and has no intermediate level between ON and OFF. Typamatic is one of the solution to convey operator's intention by interpreting it to pressing time. Changing pressure is the other way of interpretating an operator message to be conveyed, with high pressure corresponding to far and low pressure corresponding to near. The pressure-sensitive key described in this article senses the pressure level and informs the system. Thus, the system can control the pointer on its display according to the information which comes from the keys.

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Pressure-Sensitive Key

This article describes a pressure-sensitive cursor direction key to improve usability as a pointing device, wherein variable key pressure provides variable cursor speed on a display. Prior key output is binary, such as ON and OFF (pressed/released), and has no intermediate level between ON and OFF. Typamatic is one of the solution to convey operator's intention by interpreting it to pressing time. Changing pressure is the other way of interpretating an operator message to be conveyed, with high pressure corresponding to far and low pressure corresponding to near. The pressure-sensitive key described in this article senses the pressure level and informs the system. Thus, the system can control the pointer on its display according to the information which comes from the keys. This method is also applicable to detecting acceleration of key stroke. Counting the increasing and/or decreasing speed of the key stroke helps to convey the operator's intention. As shown in a figure, pressing the key top makes the brush go down and the distance of the brush down is detected by a digitizer which produces one of 256 signal levels in accordance with the distance. The non-linear coil spring increases the sensitivity when key stroke is short. In the case where the digitizer is formed by a resistor, key stroke is detected analogically with the variation of resistance.

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