Browse Prior Art Database

LED Print Analyzer

IP.com Disclosure Number: IPCOM000075247D
Original Publication Date: 1971-Aug-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Bartz, MR: AUTHOR [+2]

Abstract

This instrument measures the reflectance of printing, background ink and paper relative to a standard such as BaSO(4) or MgO. Document 1 is placed on document support plate 2 and inserted under scanner assembly 3, Fig. 1. The instrument is turned on by rotating switch 4 clockwise; this also energizes lamp 5 which illuminates chamber 20, Fig. 2. The viewer observes the document through a path comprised of microscope 6, mirror 7, beam splitter 8 and lens 9. Document 1 is moved under scanner assembly 3 so that the area to be measured is aligned with cross hairs of microscope 6. The document is held securely by hold-down assembly 19.

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LED Print Analyzer

This instrument measures the reflectance of printing, background ink and paper relative to a standard such as BaSO(4) or MgO. Document 1 is placed on document support plate 2 and inserted under scanner assembly 3, Fig. 1. The instrument is turned on by rotating switch 4 clockwise; this also energizes lamp 5 which illuminates chamber 20, Fig. 2. The viewer observes the document through a path comprised of microscope 6, mirror 7, beam splitter 8 and lens 9. Document 1 is moved under scanner assembly 3 so that the area to be measured is aligned with cross hairs of microscope 6. The document is held securely by hold-down assembly 19.

Switch 4 is rotated clockwise to the next position turning off lamp 5 and turning on discrete LED 10. Light from LED is focused on the document at C. Mirrors 11 and 12 are sections of elliptical cylinders, which focus reflected light on photodiodes 13 and 14 through paths C, A, E and C, B, D. The current generated by the photodiodes is fed into video amplifier 15. The output of the video amplifier drives reflectance meter 18 which measures reflectance from the document at point C. Controls 16 and 17 are used to calibrate reflectance meter 18 with a standard prior to making the desired measurement.

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