Figure 1: AMIS-710227/228/229 Module Block Diagram

(See Table 4-A for Pin Out Designation)

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. 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 Section 10: MTF

Graph and its Discussion.

2

AMI Semiconductor – May 06, M-20548-001

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