Revision 1.3

Mar.22 2001

-13-

GL646USB

15x31.25ns/pixel = 0.469us/pixel

(1). 600dpi : 1.517~2.533ms/line

(2). 1200dpi : 3.034~5.066ms/line

6.4. Fast scan for low DPI

Multiple CCD clocking rates allows speed up scan speed. You can speed up 2 times, 3 times or 4 times scanning

time for low resolution.

For example,600dpi scanner: if 75dpi speed up 4 times then 5.4ms/4=1.35ms/line. Scan speed is equal to 1.18s/page.

Chunky scan: You can speed up 2 times,3 times or 4 times scanning time.

Planar scan: 9 system clock/pixel: You can not speed up scanning time

12 system clock/pixel : You can speed up 2 times scanning time

15 system clock/pixel : You can speed up 2 times scanning time

6.5. Scanning Type

Support three line in(parallel ) for CCD, one line in for CCD or CIS, RGB line by turns in for CCD three types.

A. CCD

a. Three line in :

b. Line by line :

c.

Line by turns :

B. CIS

a. color scan :

TG

LED R

LED G

LED B

b.

gray scan:

G

B

R

RG

B

R

G

B