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ILLUMINATION LAMP ASSEMBLY FOR A DOCUMENT SCAN SYSTEM

IP.com Disclosure Number: IPCOM000025624D
Original Publication Date: 1986-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 147K

Publishing Venue

Xerox Disclosure Journal

Abstract

A document reproduction system which incorporates a scanning optical system can experience exposure strobing due to mechanical vibration of the various components comprising the optical system and particularly, vibrations of the scan/illumination lamp as it accelerates during a scan mode

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XEROX DISCLOSURE JOURNAL

ILLUMINATION LAMP ASSEMBLY Proposed Classification FOR A DOCUMENT SCAN SYSTEM
John H. Hinton
Keith A. Nau
Roger W. Budnik

U.S. C1.355/8 Int. Cl. G03g 15/28

37 40 1 FIG. t-* 7.4

Volume 11 Number 5 Septernber/October 1986 2 43

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ILLUMINATION LAMP ASSEMBLY FOR A DOCUMENT SCAN
SYSTEM
(Cont'd)

39

FIG: 3

54

39c

A document reproduction system which incorporates a scanning optical system can experience exposure strobing due to mechanical vibration of the various components comprising the optical system and particularly, vibrations of the scan/illumination lamp as it accelerates during a scan mode

The lamp acquires a vibration component which causes the illumination profile at a photoreceptor surface to oscillate in space. This oscillation results in exposure strobing causing undesirable streaking in an output copy sheet. The natural frequency of a lamp is related to the spring rate and the mass of the lamp, expressed by the formula:

where k is the spring rate in lbdin and m is the mass of the object. If the spring rate (stiffness) of the lamp is increased, the natural frequency would be increased. Figure 1 shows a scan lamp assembly 37 having an elastomeric 0- ring 38, around the lamp 39 circumference. The O-ring is biased against the lamp surface by designing reflectors 40 and 41 so that they are joined together at interface seam 42, securing O-ring 38 between the reflectors and the lamp surface. The O-ring is positioned between lamp filaments 44 so as not to interfere with light transmission. By positioning the O-ring rn the center (length) the lamp length is effectively cut in half, thus increasing the stiffness by a factor of 8. For some systems it may be desirable to use more than one 0- ring An alternate solution, still associated with the increased lamp stiffness concept is to fasten one or more extension springs around the lamp in a garter fashion. Again, the springs would be arranged so as not to block light transmission from the filaments.

              XEROX DISCLOSURE JOURNAL 244 Volume 11 Number 5 September/October 1986

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