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COOLING MECHANISM FOR SCANNING LAMP ASSEMBLY

IP.com Disclosure Number: IPCOM000025747D
Original Publication Date: 1987-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 122K

Publishing Venue

Xerox Disclosure Journal

Abstract

Figure 1 shows a low-pressure, mercury vapor, fluorescent discharge lamp 2 reciprocated (by means not shown) along the length of a pair of guide rails 4 and 6 extending in parallel with each other and perpendicularly to the axis of the lamp 2. A platen (not shown) is positioned above the lamp and a document to be copied is placed on the platen surface. Lamp 2 extends across the guide rails 4 and 6 and is supported by them for reciprocal movement over the area between them under the influence of an intermittently-operated drive motor (not shown). The electrical connections to the end terminals 10 on the lamp 2 are such as to permit the lamp to be energized throughout its whole range of movement, so that it remains energized as it traverses below the platen in at least one direction, in order to illuminate a document supported by the platen so that light reflected from the document selective1 discharges an associated

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

COOLING MECHANISM FOR Proposed Classification SCANNING LAMP ASSEMBLY US. C1.35518
Robert
K. Beiter
C1. Int. Stephen C. Corona G03g 15/28

NG. I

4

0

FIG. 2

Volume 12 Number 5 September/October 1987 229

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

Page 2 of 2

COOLING MECHANISM FOR SCANNING LAMP ASSEMBLY (Cont'd)

Figure 1 shows a low-pressure, mercury vapor, fluorescent discharge lamp 2 reciprocated (by means not shown) along the length of a pair of guide rails 4 and 6 extending in parallel with each other and perpendicularly to the axis of the lamp 2. A platen (not shown) is positioned above the lamp and a document to be copied is placed on the platen surface. Lamp 2 extends across the guide rails 4 and 6 and is supported by them for reciprocal movement over the area between them under the influence of an intermittently-operated drive motor (not shown). The electrical connections to the end terminals 10 on the lamp 2 are such as to permit the lamp to be energized throughout its whole range of movement, so that it remains energized as it traverses below the platen in at least one direction, in order to illuminate a document supported by the platen so that light reflected from the document selective1 discharges an associated

For effective operation of the lamp 2, it is desirable or necessary to have cold spots provided at at least one location of the lamp envelope, so as to enhance the condensation of mercury vapor at that point. A supply of free liquid mercury is necessary to facilitate the gaseous discharge process taking place in the lamp. As shown in Figure 1, three cold spots are provided by a draft of cooling air travelling along a conduit 14 and being diverted upward at the appropriate locations by tabs 15. The right-hand end of conduit 14, is sealed by...