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.

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

Symbol

Names and Functions

1

VOUT1

Analog Video Output 1

2

VOUT2

Analog Video Output 2

3

GND

Ground; 0V

4

VOUT3

Analog Video Output 3

5

VOUT4

Analog Video Output 4

6

Vdd

Positive power supply

GLASS WINDOW

DOCUMENT SURFACE

LIGHT PATH

SENSORS

PCB

LED

BAR

INSIDE PICTORIAL OF MODULE

PAGE 3 OF 10 - PI227/228/229, 01-31-04