Browse Prior Art Database

EXPOSURE CONTROL WITH MULTIPLE FLASH LAMPS

IP.com Disclosure Number: IPCOM000025505D
Original Publication Date: 1985-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 66K

Publishing Venue

Xerox Disclosure Journal

Abstract

The figure discloses a document imaging system consisting of an enclosed housing 10 having an upper surface defined by a document support platen 12. The bottom surface accommodates a lens 14. A photoreceptor 16 is positioned beneath the housing and is exposed to light reflected from a document placed on platen 12. The light is produced by lamps 20, 22, 24, 26 located within the housing. Lamp 20 produces a first component of the total required exposure. Photodetector 28 measures the light from the cavity walls and determines the remaining exposure required from lamps 22, 24, 26, as well as their sequencing.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

EXPOSURE CONTROL WITH MULTIPLE FLASH LAMPS Lawrence J. Mason

Proposed Classification
U.S. CI. 355/8 Int. CI. G03g 15/28

Volume 10 Number 5 September/October 1985 295

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Page 2 of 2

EXPOSURE CONTROL WITH MULTIPLE FLASH LAMPS (Cont'd)

The figure discloses a document imaging system consisting of an enclosed housing 10 having an upper surface defined by a document support platen 12. The bottom surface accommodates a lens 14. A photoreceptor 16 is positioned beneath the housing and is exposed to light reflected from a document placed on platen 12. The light is produced by lamps 20, 22, 24, 26 located within the housing. Lamp 20 produces a first component of the total required exposure. Photodetector 28 measures the light from the cavity walls and determines the remaining exposure required from lamps 22, 24, 26, as well as their sequencing.

As an example, lamp 20 produces 60% of the total required exposure. Lamps 22, 24, 2 must supply the remaining 4096. The smallest energy unit would be
.45/(2 1-11 where J is the total maximum energy required and N is the number of lamps in the second stage. Since N=3 for this example, the least energy unit for lamp 22 would be .45/(8-1) = .06J.

kl

Lamps 24, 26 would supply .12J and .24J of the total energy.

XEROX 296 DISCLOSURE JOURNAL

Volume 10 Number 5 September/October 1985

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