Browse Prior Art Database

Battery Saver Circuit for Infrared-Linked Keyboard

IP.com Disclosure Number: IPCOM000044015D
Original Publication Date: 1984-Oct-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Estes, LT: AUTHOR

Abstract

There are desktop computers having battery-powered, detachable keyboards which communicate with a system unit through an infrared link. Some of these keyboards do not include an on/off switch for disconnecting the battery between periods of use. There is a remote possibility that an item, such as a book, left on such a keyboard will cause one or more keys to remain depressed during periods of non-use. As some keys will repeatedly generate character codes for as long as the key remains depressed, there is a remote possibility that the keyboard battery could become exhausted. To avoid this, it is suggested that a limit be imposed on the number of consecutive, identical character codes which the keyboard transmitter will accept without a fresh key depression.

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Battery Saver Circuit for Infrared-Linked Keyboard

There are desktop computers having battery-powered, detachable keyboards which communicate with a system unit through an infrared link. Some of these keyboards do not include an on/off switch for disconnecting the battery between periods of use. There is a remote possibility that an item, such as a book, left on such a keyboard will cause one or more keys to remain depressed during periods of non-use. As some keys will repeatedly generate character codes for as long as the key remains depressed, there is a remote possibility that the keyboard battery could become exhausted. To avoid this, it is suggested that a limit be imposed on the number of consecutive, identical character codes which the keyboard transmitter will accept without a fresh key depression. The limit may be expressed as a maximum number of characters or a maximum time.

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