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Browse Prior Art Database

Fiber Optic Read Head

IP.com Disclosure Number: IPCOM000095301D
Original Publication Date: 1965-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Sokolski, M: AUTHOR

Abstract

Fiber optic read head 10 reflectively senses marks 11 on document 12. Light transmitting and receiving fiber bundles 15 and 20, respectively, are provided for each sensing position. Single light source 13 furnishes light to all bundles 15. Reflected light is directed by bundles 20 to phototransistors 21 from which the output signals are taken.

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Fiber Optic Read Head

Fiber optic read head 10 reflectively senses marks 11 on document 12. Light transmitting and receiving fiber bundles 15 and 20, respectively, are provided for each sensing position. Single light source 13 furnishes light to all bundles 15. Reflected light is directed by bundles 20 to phototransistors 21 from which the output signals are taken.

In many instances, particularly when sensing marks on a document, the reflectance of the marks is substantially the same as that of the document. This results in a very poor output signal even though the color contrast between a mark and the document is very great.

In order to achieve high resolution and signal output, the numerical aperture of fiber bundles 15 and 20 is between 0.5 and 0.65. Bundles 15 and 20 are mounted in housing 25 adjacent to each other with their ends viewing the document cut on an angle. This results in an illuminating area B and a viewing area A. Common area C then becomes the high resolution scan area. The high intensity illuminating rays 17 are reflected out of the viewing area of bundle 20, Since the high intensity reflected rays of glossy marks are not picked up by 20, a high signal output results.Although an angle of 27 degrees is shown, this angle varies with the index of refraction of the cores of the fiber bundles.

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