Document scanner employing a test chart to correlate the indepen

Details Document scanner employing a test chart to correlate the indepen Document scanner employing a test chart to correlate the indepen

1994-04-26

1995-10-03

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250234, 358406, 358474, H01J 4014

Patent

active

054554128

ABSTRACT:
A scanner is so arranged that a quantity of light reaching a CCD sensor can be kept constant with a change in reading position. In case a light source and a reading optical unit are driven independent of each other, variations in feed amount inevitably occur. To deal with it, a test chart of a specified length is first read to measure moving amounts of the light source and the reading optical unit. Then, the reading optical unit is moved by a predetermined amount. The light source is moved as effecting a correction based on the moving amounts initially measured. Then, a one-line reading process is carried out to scan an image on a document.

REFERENCES:
patent: 4893196 (1990-01-01), Koshiyouji et al.
patent: 5130525 (1992-07-01), Ryon
patent: 5245440 (1993-09-01), Sato
patent: 5282053 (1994-01-01), Robideau
patent: 5309205 (1994-05-01), Hayano

Affiliated with

Also associated with

Rating

Document scanner employing a test chart to correlate the indepen does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Document scanner employing a test chart to correlate the indepen, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Document scanner employing a test chart to correlate the indepen will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1078850