Browse Prior Art Database

Optical Keyboard

IP.com Disclosure Number: IPCOM000080186D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Dimmick, RF: AUTHOR [+2]

Abstract

An optical keyboard is provided which has tactile feedback, "N" key roll over and encoded output.

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Optical Keyboard

An optical keyboard is provided which has tactile feedback, "N" key roll over and encoded output.

Keys 10 are mounted in housing 30, Figs. 1 and 2, and upon manual depression, operate an associated interposer 11 which in turn deflects beam mounted actuator 12. Actuator 12 upon being deflected, enters either a rectangular slot 13 or angular slot 14 in slideable code bars 15, Figs. 2 and 3, positioned orthogonally to actuator 12.

If actuator 12 enters a rectangular slot 13, code bar 15 is not displaced and light from light source 25 passes through slot 16 in code bar 15 and impinges upon photosensitive device 26. However, when actuator 12 enters angular slot 14, code bar 15 is displaced so that tip 17 blocks light from photosensitive device 26, as seen in Fig. 4.

Each actuator 12 interacts with ten code bars 15. The outer two code bars generate synchronizing pulses and the remaining code bars provide eights bits for character encoding. Depression of one key 10 prevents simultaneous operation of another key, because actuator 12 interacts with all of the code bars and holds nonactuated code bars against movement as it enters the rectangular slots 13 of the nonactuated code bars.

There are five light sources 25 and each light source services two code bars and two photosensitive devices 26. The normal unoperated position of a code bar allows light to impinge upon the associated photosensitive device 26, so as to permit an "all cells on" check to be mad...