Browse Prior Art Database

Combined Reading of Punched Holes and Marks

IP.com Disclosure Number: IPCOM000091838D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Boeckh, LK: AUTHOR [+6]

Abstract

Record cards carrying information in the form of punched holes or marks in different columns are scanned by a single optical reading head. The latter, when activated by control marks, senses light reflected by the marked areas or transmitted through the punched holes. Fiber optical reading head 10 comprises light transmitting and receiving fiber bundles 11 and 12 for the index positions of one column. Single light source 13 emits light to all bundles 11. The upper extremities of bundles 11 and 12, having slender rectangular square sections, are arranged vertically in relation to the surface of card 14.

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Combined Reading of Punched Holes and Marks

Record cards carrying information in the form of punched holes or marks in different columns are scanned by a single optical reading head. The latter, when activated by control marks, senses light reflected by the marked areas or transmitted through the punched holes. Fiber optical reading head 10 comprises light transmitting and receiving fiber bundles 11 and 12 for the index positions of one column. Single light source 13 emits light to all bundles 11. The upper extremities of bundles 11 and 12, having slender rectangular square sections, are arranged vertically in relation to the surface of card 14. Bundles 11 and 12 are disposed adjacent to each other or are distributed at random to direct light with uniform intensity, through a hole 15, to photocell 16 below the dotted line, or by reflection from a mark 17 to photocell 18 above the dotted line.

Punched holes 15 and marks 17 are located at index positions 19 of card 14. The lateral mark space is limited by the center lines of two subsequent columns 20, resulting in a card with half as many marks as there are holes. Control marks 21 are in card column 0 for distinguishing cards with both holes and marks. In order to avoid confusion with other printing, these marks are placed in index positions 11, 1, 3, 5, and 7. The output signals of the respective photocells 18 are gated to generate a control signal 22 conditioning head 10 for sensing either marks or holes.

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