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Battery Powered Data Entry Unit

IP.com Disclosure Number: IPCOM000078975D
Original Publication Date: 1973-Apr-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Foster, LD: AUTHOR

Abstract

A hand-held battery powered data entry unit having a keyboard and an optical display is provided with a timeout circuit, which is active once a character is displayed. If the timeout period lapses without something happening to affect the display, power to the data entry unit logic, keyboard and optical display is turned off, and the operation switches into a lower power mode where power is provided only to the storage media. Circuitry is also provided for detecting a low-voltage power supply condition and inhibiting the keyboard electronically until the low-voltage condition is corrected, such as by recharging the unit.

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Battery Powered Data Entry Unit

A hand-held battery powered data entry unit having a keyboard and an optical display is provided with a timeout circuit, which is active once a character is displayed. If the timeout period lapses without something happening to affect the display, power to the data entry unit logic, keyboard and optical display is turned off, and the operation switches into a lower power mode where power is provided only to the storage media. Circuitry is also provided for detecting a low- voltage power supply condition and inhibiting the keyboard electronically until the low-voltage condition is corrected, such as by recharging the unit.

The data entry unit 10, Fig. 1, is provided with a keyboard 15 and an optical display 30. Keyboard 15 includes the conventional numeric keys 0-9 and several functions or command keys. The enter key 16 is depressed when characters are to be entered into storage, to blank display 30 and to increment to the next record boundary in storage. In order to recall and display the previous data records entered in storage, recall key 17 must be depressed. Successive depressions of key 17 successively steps storage backwards. The clear key 18 is used to effect erasure of a record in storage so that it may be updated or corrected. Return key 19 is used when it is desired to reset the data address to the end of a data record boundary.

The operation and logic for the data entry unit 10 is shown in the flow chart in Fig. 2. Power on reset block 31 initializes the logic circuits, however, a separate switch, not shown, is used to reset storage and set the sto...