Automatic exposure control system in a document recorder

Details Automatic exposure control system in a document recorder Automatic exposure control system in a document recorder

G - Physics

03

G

95/28

G03G 15/28 (2006.01) G03B 27/74 (2006.01) G03B 27/80 (2006.01)

Patent

CA 1083397

ABSTRACT OF THE DISCLOSURE The disclosure relates to an automatic exposure control system for use in a document recorder of the type which makes a photographic reproduction of each. of a series of documents and which has a document transport for feeding the documents along a predetermined path and an exposure station within the predeter mined path including an exposure light source for illuminating each document as each document is presented to the exposure station to facilitate the photographing of the documents. The automatic exposure control system controls the illumination intensity of the exposure light source in response to the reflectivity of each document to assure proper exposure of each document. It includes a first light source arranged relative to the predetermined path in advanced relation to the exposure station relative to document travel for projecting light onto the documents, a first light sen- sitive element arranged relative to the predetermined path for receiving the light reflected from the documents originating from the first light source for providing a first control signal having a magnitude directly related to the intensity of the reflected light, a feedback arrangement coupled between the first light source and the first light sensitive element for controlling the intensity of the first light source in response to the first con- trol signal to render the intensity of the reflected light received by the first light sensitive element substantially constant, and control means coupled to the exposure light source and responsive to the light output intensity of the first light source for con- trolling the illumination intensity of the exposure light source as each document is presented to the exposure station.

279060

Affiliated with

Also associated with

Rating

Automatic exposure control system in a document recorder does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic exposure control system in a document recorder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic exposure control system in a document recorder will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-339630