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Touch Sensitive Device

IP.com Disclosure Number: IPCOM000092884D
Original Publication Date: 1967-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Shah, B: AUTHOR

Abstract

A touch sensitive device is provided by placing light emitter 1 and a number of photodetectors 2 in a paraboloid of revolution 3. Window 4 is contacted by finger 5 to perform the control function. Light emitting diode 1 is the centrally located diode in a three-by-three array in which the other eight diodes 2 are connected in parallel. Diodes 2 are reverse biased to be light sensitive. The light emitted from diode 1 is directed upwards by opague barriers 6. When a finger is put on hermetically sealed glass window 4, a portion of the radiation from diode 1 is deflected back and detected by diodes 2. The signal produced by diodes 2 in response to the deflected light then can be used to perform the desired function.

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Touch Sensitive Device

A touch sensitive device is provided by placing light emitter 1 and a number of photodetectors 2 in a paraboloid of revolution 3. Window 4 is contacted by finger 5 to perform the control function. Light emitting diode 1 is the centrally located diode in a three-by-three array in which the other eight diodes 2 are connected in parallel. Diodes 2 are reverse biased to be light sensitive. The light emitted from diode 1 is directed upwards by opague barriers 6. When a finger is put on hermetically sealed glass window 4, a portion of the radiation from diode 1 is deflected back and detected by diodes 2. The signal produced by diodes 2 in response to the deflected light then can be used to perform the desired function.

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