Browse Prior Art Database

Optical Keyboard Encoding System

IP.com Disclosure Number: IPCOM000097431D
Original Publication Date: 1962-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 42K

Publishing Venue

IBM

Related People

Smith, HJ: AUTHOR

Abstract

In this optical keyboard encoding system, a binary coded signal representative of each key of the keyboard is generated when each key is struck. A separate code signal is generated depending on whether the key is struck in the upper case or lower case mode.

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Optical Keyboard Encoding System

In this optical keyboard encoding system, a binary coded signal representative of each key of the keyboard is generated when each key is struck. A separate code signal is generated depending on whether the key is struck in the upper case or lower case mode.

Key 1 is a typical key of the encoding keyboard. A plurality of filters 2...9 are mounted in key 1. Filter 2 is shown opaque. Filters 3 and 4 are transparent with 0 degree polarization. Filters 5 and 6 are transparent and unpolarized. Filter 7 is transparent with 90 degree polarization. Filter 8 is opaque and filter 9 is transparent with 90 degree polarization.

Light source 10 directs light through a polarizer shift filter 11 and onto a plurality of receptors 12...19. Depression of key 1 causes filters 2...9to be placed in the path between light source 10 and receptors 12...19. Each receptor 12...19 is responsive to the light passing through a separate one of filters 2...9.

The shift key of the keyboard (not shown) is connected to polarizer shift filter 11 and orients it, for example, at 90 degree for the lower case shift and O degree for the upper case shift.

This arrangement results in the following conditions of the receptors 12...19. TABLE I

Code Filter No. Polarizer Shift Filter Position 90 degrees 0 degree

Filter 2 (opaque) No transmission No transmission Filter 3 (transparent 0 degree) No transmission Transmission Filter 4 (transparent 0 degree) No transmission Transmission Filter 5 (unpolarized) Transmission Transmission Filter 6...