Photocopying – Contact printing – Light boxes
Patent
1991-12-20
1993-09-14
Picard, Leo P.
Photocopying
Contact printing
Light boxes
118663, 118694, 355208, G03G 2100
Patent
active
052453901
ABSTRACT:
A device incorporated in image forming equipment for adjusting the output of an image density sensor which optically senses the density of a toner image formed on a photoconductive element and representative of a reference pattern. The density sensor is made up of a light emitting element and a light-sensitive element. Thresholds divide an output range wherein the output characteristic of the sensor does not change into a plurality of subranges having the optimal output associated with the background of the photoconductive element as the center value. The sensor senses the background of the photoconductive element at predetermined intervals. Whether or not to adjust the output of the sensor is determined on the combination of the subrange where the resulting output of the sensor lies and the number of times that the former lies in the latter. The sensor output, i.e., a PWM (Pulse Width Modulation) duty to be fed to the light emitting element is changed to control the adjusted output associated with the background to the optimal value.
REFERENCES:
patent: 4894685 (1990-01-01), Shoji
patent: 5006896 (1991-04-01), Koichi et al.
patent: 5036363 (1991-07-01), Iida et al.
Ishigaki Kouji
Shimbo Yusuke
Horgan Christopher
Picard Leo P.
Ricoh & Company, Ltd.
LandOfFree
Device for adjusting output of image density sensor incorporated does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for adjusting output of image density sensor incorporated, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for adjusting output of image density sensor incorporated will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2031252