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Browse Prior Art Database

APERTURE CONTROL OF INTEGRATING CAVITY FLASH LAMP EXPOSURE

IP.com Disclosure Number: IPCOM000025569D
Original Publication Date: 1986-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 69K

Publishing Venue

Xerox Disclosure Journal

Abstract

The figure shows an integrating cavity housing 10 suitable for flash-exposing documents placed on the top (platen) surface. A first, full power flash lamp 12 IS mounted on one wall of the cavity. A second, smaller flash lamp 14 is mounted on a second wall. When a document is in the copying position, an exposure measurement is made by firing lamp 14 and measuring the resultant light by means of photodetector 16. An attenuator I$ is moved into position beneath lens 20 mounted in the cavity floor. Attenuator 18 can be an iris-type aperture, a disc coated with a varying density profile, or a multiple-leafed attenautor. The position of the attenuator controls the amount of exposure at a photoreceptor moving along the focal plane of the lens. Once the attenuator is positioned, lamp 12 is fired to provide full document exposure.

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XEROX DISCLOSURE JOURNAL

APERTURE CONTROL OF INTEGRATING CAVITY FLASH LAMP EXPOSURE
L. J. Mason

Proposed Classification
U.S. Ci. 355/8

Int. CI. C03g 15/28

Volume 11 Number 2 MarchlApril 1986 77

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

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APERTURE CONTROL OF INTECRATlNG CAVITY FLASH LAMP EXPOSURE

(Cont'd)

The figure shows an integrating cavity housing 10 suitable for flash-exposing documents placed on the top (platen) surface. A first, full power flash lamp 12 IS

mounted on one wall of the cavity. A second, smaller flash lamp 14 is mounted on a second wall. When a document is in the copying position, an exposure measurement is made by firing lamp 14 and measuring the resultant light by means of photodetector 16. An attenuator I$ is moved into position beneath lens 20 mounted in the cavity floor. Attenuator 18 can be an iris-type aperture, a disc coated with a varying density profile, or a multiple-leafed attenautor. The position of the attenuator controls the amount of exposure at a photoreceptor moving along the focal plane of the lens. Once the attenuator is positioned, lamp 12 is fired to provide full document exposure.

For systems having multiple &eurolash lamps 12, if the timing of the lamp firing is split so that the exposure occurs in two segments, then the first exposure segment would be used to measure the amount of exposure still required from the second firing. Timing of the firing of the second lamp would be delayed until the at...