Functional Description

The PI411MC-A7 consists of 11 imaging array sensors that are cascaded to provide 1408

photo-detectors. Each sensor has their associated multiplex switches, and a digital shift

register that controls its sequential readout. Each also contains a chip select switch so

that each following chip is accessed sequentially as its predecessor chip completes its

scan. Theses chips are mounted on a PCB board along with clock buffers and video

signal amplifier. See Figure 1. PI411MC-A7 module block diagram.

Figure 1. PI411MC-A7 module block diagram.

The PCB containing the imaging array is enclosed in a module housing, along with a one-

to-one graded indexed micro lens array that focuses the scanned documents' image onto

the sensing line of the sensor chips. The document is illuminated with a LED light source,

which is also mounted in the housing. See Figure 2. PI411MC-A7 Cross Sectional View.

Figure 2. PI411MC-A7 Cross Sectional View

GLASS WINDOW

DOCUMENT SURFACE

LIGHT PATH

SENSORS

PCB

LE

D

BA

R

INSIDE PICTORIAL OF MODULE

GLED

VLED

ROD LENSE

BUFFER

SHIFT REGISTER

VIDEO AMPL

PHOTO SENSORS

CP

SP

GRD

VDD(+5)

GRD

VOUT

1406

1407

1408

VIDEO LINE

1 2 3 4

LED

LED

LED

LED

LED

LED

LED

LED

PAGE 2 OF 7 - PI411MC-A7, 06-06-02