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Photoelectric Relay With Storage

IP.com Disclosure Number: IPCOM000097051D
Original Publication Date: 1962-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Schulz, A: AUTHOR

Abstract

Relay and storage action is achieved by illuminating a PN junction. The current-voltage characteristic of this resembles that of tunnel diode. The characteristic shifts due to the photoelectric effect at the PN junction.

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Photoelectric Relay With Storage

Relay and storage action is achieved by illuminating a PN junction. The current-voltage characteristic of this resembles that of tunnel diode. The characteristic shifts due to the photoelectric effect at the PN junction.

Tunnel diode 6 is forwardly connected in series with a resistor R7 to a voltage source U1. With the PN junction not illuminated, the operating point A is established. When light source 4 illuminates the PN junction, e.g., through a hole in record carrier 5, the characteristic 2 is produced. The operating point A is no longer stable and operating point B is set up providing a higher current.

Operating point B remains stable also after illumination is terminated. The characteristic 1 is re-established, so that storage action occurs. For resetting to the original operating point A, additional current is fed to the circuit. The over-all current is, by the tunnel diode 6, momentarily raised above the maximum value in front of the descending part of the characteristic 1. The additional current is supplied through resistor R8, voltage source U2 and switch 9.

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