Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

UNIFORM FLUORESCENT LAMP

IP.com Disclosure Number: IPCOM000026140D
Original Publication Date: 1990-Aug-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 62K

Publishing Venue

Xerox Disclosure Journal

Abstract

The output uniformity along the length of a fluorescent lamp used by image bars is improved by attaching a heat sinWclip arrangement to the lamp as shown in Figure 1. Fluorescent lamp 10 has a plurality of small spring clips 12 placed at indicated positions along the lamp. Clips 12 are connected to a heat sink 14 positioned axially parallel to the lamp. Normally a fluorescent lamp 10 is hotter at the ends than at the center. Since the light eficiency of the phosphor of the lamp is less at temperatures above 105"F, the light output follows the solid curve in Figure 1. Near ends of the lamp the clips are more dense, therefore cooling the lamp more, while near the center the clips are less dense allowing less cooling. At the center, no clip is provided at all thereby raising the temperature of the center above what would be if a clip were used. The anticipated illumination distribution is shown by the dotted line in Figure

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 94% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

UNIFORM FLUORESCENT LAMP Proposed Classification Joseph F. Stephany US. C1.313/493 Virgil J. Hull
Michael Poleshuk

Int. C1. HOlj 01/62

- Illumination without clips

at less I I - . . . . - Illumination with clips I umi nation center
higher
at ends with clips

Illumination

Distance Along Lamp \

\lo

Heatsink with clips concentrated at ends

FIG. 1

XEROX DISCLOSURE JOURNAL - Vol. 15, No. 4 July/August 1990 203

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

Page 2 of 2

UNIFORM FLUORESCENT LAMP(Cont'd)

The output uniformity along the length of a fluorescent lamp used by image bars is improved by attaching a heat sinWclip arrangement to the lamp as shown in Figure 1. Fluorescent lamp 10 has a plurality of small spring clips 12 placed at indicated positions along the lamp. Clips 12 are connected to a heat sink 14 positioned axially parallel to the lamp. Normally a fluorescent lamp 10 is hotter at the ends than at the center. Since the light eficiency of the phosphor of the lamp is less at temperatures above 105"F, the light output follows the solid curve in Figure 1. Near ends of the lamp the clips are more dense, therefore cooling the lamp more, while near the center the clips are less dense allowing less cooling. At the center, no clip is provided at all thereby raising the temperature of the center above what would be if a clip were used. The anticipated illumination distribution is shown by the dotted line in Figure


1.

204 XEROX DISCLO...