Browse Prior Art Database

Improvement Of Neon Bulb Ignition Characteristics

IP.com Disclosure Number: IPCOM000097878D
Original Publication Date: 1961-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Donner, EF: AUTHOR

Abstract

The ignition characteristics of neon and similar gaseous discharge devices varies from time-to-time for individual bulbs of a given type as well as for different types of apparently similar construction.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Improvement Of Neon Bulb Ignition Characteristics

The ignition characteristics of neon and similar gaseous discharge devices varies from time-to-time for individual bulbs of a given type as well as for different types of apparently similar construction.

These variations are reduced greatly by arranging the circuitry in which the bulbs are connected to bleed sufficient current through a bulb at all times to ionize the gaseous medium at a level below that affecting operation of associated components. For example, the EXCLUSIVE OR 10 is arranged to bleed current through the neon bulb 12. This is at a level at which an associated photoconductor 14 is not energized by light from bulb 12 until OR 10 has light input applied from one source A or another source B igniting bulb 12 to full brilliance.

OR 10 is derived by shunting the photoconductors 16 and 17 of one branch with resistors 18 and 19. The latter have a value so that current flows through the neon bulb 12 in the absence of light impinging on any of the photoconductors. Also, their value is such that light emanating from the bulb 12 is just insufficient to produce any appreciable effect on the output photoconductor
14. The resistor normally shunted across the bulb 12 is unnecessary.

1

Page 2 of 2

2

[This page contains 1 picture or other non-text object]