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RARE GAS FLUORESCENT LAMP FOR REPRODUCTION DEVICE

IP.com Disclosure Number: IPCOM000025069D
Original Publication Date: 1983-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 55K

Publishing Venue

Xerox Disclosure Journal

Abstract

Mercury-containing fluorescent lamps are commonly used in reproduction devices wherein an original document is incrementally illuminated in a scanning mode by one or two mercury fluorescent lamps. These lamps are subject to various problems such as instabilities in the axial optical profile and long warm-up time. A fluorescent lamp in which the mercury is replaced by one of the rare gases such as neon avoids these problems. Such a lamp would be inherently more stable, particularly to temperature variations and would have instant-on characteristics. Some examples of rare gas fluorescent lamps are as follows:

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KEROX DISCLOSURE JOURNAL

RARE GAS FLUORESCENT LAMP FOR REPRODUCTION DEVICE U.S. CI. 355/67 William L. Lama
Thomas J. Hammond

Proposed Classification

Int. C1. G03b 27/54

Mercury-containing fluorescent lamps are commonly used in reproduction devices wherein an original document is incrementally illuminated in a scanning mode by one or two mercury fluorescent lamps. These lamps are subject to various problems such as instabilities in the axial optical profile and long warm-up time. A fluorescent lamp in which the mercury is replaced by one of the rare gases such as neon avoids these problems. Such a lamp would be inherently more stable, particularly to temperature variations and would have instant-on characteristics. Some examples of rare gas fluorescent lamps are as follows:

1) Neon a 1 torr with a phosphor such as ZnSi04-Mn.

2) Xenon at 0.1 torr with a ZnSi04-Mn phosphor.

3) Neon at I torr and xenon at 0.1 torr with a ZnSi04-Mn phosphor.

4) Neon at 1 torr and helium at 1 torr with a ZnSi04-1Mn phosphor.

5) Neon at 1 torr with a phosphor such as KBr-In.

The above configurations, while suitable for scanning illuminations functions, may also be used in performing other xerographic functions, for example, to accomplish erasing unwanted charge from the surface of a photoreceptor. For erase applications the phosphor may not be needed.

Volume 8 Number 3 May/June 1983 269

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270 XEROX DISCLOSURE JOURNAL

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