Mounted in the module housing, along with the PCB, is the second major component , it is
a one-to-one graded indexed micro lens array that focuses the scanned documents'
image onto the sensing line of the sensor chips. The third major component, mounted in
the module, is the LED light source. See Figure 2. The PI227/228/229's Cross Sectional
View. This pictorial cross section shows the LED Bar light source and its Illumination path
as it reflects the image from the document and focuses through the ROD lens on to its
image sensing line of the sensing chips. All components are housed in a small plastic
housing and covered with the fourth major component, a glass window. This cover glass
not only serves to protect all of the critical components within the housing from dust, but
also serves a minor role in the optical system. Together with rest of the module's optical
system, the module is adjusted to obtain the optimum depth-of-focus. See the paragraph
on MTF Graph and Its Discussions.
DOCUMENT SURFACE
GLASS WINDOW
LIGHT PATH
MODULE HOUSE
ROD LENS
D
LE
R
BA
SENSORS
PCB
INSIDE PICTORIAL OF MODULE
Figure 2. PI227/228/229's Cross Section
I/O
Designation
I/O to the module is a 12-pin connector located on one end of the module. See Figure 5.
Module's Mechanical Overview. Table 1 lists the pin numbers and their designations for
the I/O connector. It is JAE IL-Z-12P-S125L3-E connector.
Pin Number
1
2
3
4
5
6
Symbol
VOUT1
VOUT2
GND
VOUT3
VOUT4
Vdd
Names and Functions
Analog Video Output 1
Analog Video Output 2
Ground; 0V
Analog Video Output 3
Analog Video Output 4
Positive power supply
PAGE 3 OF 10 - PI227/228/229, 01-31-04
AMI [ AMI SEMICONDUCTOR ]
