Browse Prior Art Database

Optical Reader

IP.com Disclosure Number: IPCOM000096107D
Original Publication Date: 1964-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Dryjanski, F: AUTHOR [+4]

Abstract

This optical reader comprises prism 4, optical system 2, light source, photocells 5, plate 6 which supports the document 3 screen 7 eliminates indirect lighting effects . Light from source 1 is focused into a rectangular thin beam 2' by optical system 2, a c cylindrical lens for example. This beam lights the document 3 to be read. Plate 6 which supports document 3, is a translucent material or is provided with apertures through which light is allowed to pass. Document 3 can be a card or a paper tape with three holes as an example. For each hole there is a beam such as 4' or 4" or 4". These beams are reflected twice by the prism faces 4a and 4b and then fall on a related photocell 5.

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Optical Reader

This optical reader comprises prism 4, optical system 2, light source, photocells 5, plate 6 which supports the document 3 screen 7 eliminates indirect lighting effects . Light from source 1 is focused into a rectangular thin beam 2' by optical system 2, a c cylindrical lens for example. This beam lights the document 3 to be read. Plate 6 which supports document 3, is a translucent material or is provided with apertures through which light is allowed to pass. Document 3 can be a card or a paper tape with three holes as an example. For each hole there is a beam such as 4' or 4" or 4".

These beams are reflected twice by the prism faces 4a and 4b and then fall on a related photocell 5.

The number of photocells 5 depends on the number of holes that might exist along a document line. The length of prism 4 is not limited. If it is required to read several lines at a time, it suffices to place side by side several photocell lines, several systems 2 and one or more light sources.

If the document bears no hole, but is slightly translucent, the light which passes through it is diffracted and distributed in various directions. The light intensity in the direction of the sensing beams is very small and, thus, the cells 5 which receive light are not sensitized.

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