Browse Prior Art Database

Photosensing Punched Cards

IP.com Disclosure Number: IPCOM000098763D
Original Publication Date: 1959-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Martin, HF: AUTHOR

Abstract

In the circuit a plurality of neon bulbs, one for each data row of a record card, is simultaneously subjected to a voltage of sufficient magnitude to fire all bulbs. Selectivity of firing is accomplished by exposing certain ones of the bulbs to light projected through data holes in the record card.

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Photosensing Punched Cards

In the circuit a plurality of neon bulbs, one for each data row of a record card, is simultaneously subjected to a voltage of sufficient magnitude to fire all bulbs. Selectivity of firing is accomplished by exposing certain ones of the bulbs to light projected through data holes in the record card.

An exposed bulb fires in a shorter period of time than an unexposed bulb and thereafter the firing pulse is terminated before the unexposed bulbs can fire.

An input pulse 1 of sufficient magnitude and duration to fire all bulbs 2 is applied to those bulbs through a line 3. Light sources 4 are directed toward corresponding bulbs 2, but normally the light is interrupted by a card 5. Certain bulbs, for example, the bulb designated 2', are exposed to the lights 4through data holes 6 in the card.

The pulse 1 is also applied to a bulb 7. Exposure of bulb 7 to a light source 8 is synchronized with the presentation of card columns to the row of bulbs 2. Bulb 7 is connected to the control grid of a thyratron 9 which conducts when the bulb 7 fires. Current flow from the line 3 through the thyratron 9 terminates the pulse 1 after the illuminated bulb 2' has fired but prior to firing of the unilluminated bulbs.

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