Browse Prior Art Database

Optical Document Sensor

IP.com Disclosure Number: IPCOM000078097D
Original Publication Date: 1972-Nov-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Bartz, MR: AUTHOR [+2]

Abstract

This document sensor, using a solid-state light source, improves reliability in a dusty environment. Collimating lens L1 forms light from light-emitting diode LED into collimated beam 3. Focusing lens L2 focuses beam 3 onto phototransistor 4 to keep it in a conductive state. A document 5 passing through beam 3 blocks the light and turns off phototransistor 4. Any light transmitted by the document is diffused and is not focused on phototransistor 4. Signal 6 is fed to amplifier 7 where it is amplified to a usable value. It is then fed to transport control 8 to monitor transport motion.

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Optical Document Sensor

This document sensor, using a solid-state light source, improves reliability in a dusty environment. Collimating lens L1 forms light from light-emitting diode LED into collimated beam 3. Focusing lens L2 focuses beam 3 onto phototransistor 4 to keep it in a conductive state. A document 5 passing through beam 3 blocks the light and turns off phototransistor 4. Any light transmitted by the document is diffused and is not focused on phototransistor 4. Signal 6 is fed to amplifier 7 where it is amplified to a usable value. It is then fed to transport control 8 to monitor transport motion.

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