Browse Prior Art Database

EL-PC Shift Register

IP.com Disclosure Number: IPCOM000098365D
Original Publication Date: 1960-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Dersch, WC: AUTHOR

Abstract

This electro optical shift register responds to a light pulse applied to all of the photoconductors.

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EL-PC Shift Register

This electro optical shift register responds to a light pulse applied to all of the photoconductors.

The basic element is a latch circuit including resistors a in series with electroluminescent light sources b and photoconductors c. Resistors d are load resistors for photoconductors c. Capacitors e serve to couple adjacent stage s.

Assuming that stages 1, 2 and 4 are in the on condition with the EL light source activated to produce a low resistance in the corresponding photoconductor, a light pulse applied to all photoconductors, produces no change in the resistance of 1c, 2c or 4c, since these are illuminated from their individual EL light sources. Photoconductor 3c changes to a low resistance. This causes EL source 3b to emit light and latch on.

A differentiated pulse is applied to 4b by capacitor 3e. This negative pulse is longer than the light pulse and causes EL source 4b to extinguish. Since photoconductor 4c changes to a high resistance before the negative pulse decays, EL source 4b remains off.

The positive pulse developed across resistor 4d is transmitted to the next stage by capacitor 4e, but it has no effect since the next stage is already on.

The off stage shifts by one position for each light pulse applied to all the photoconductors.

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