Minolta Di 620 Manual page 54

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The reflected light that passes through the filter reaches the CCD Sensor, which

converts the light into an electrical signal (image data signal). This signal then

passes into the Digital Image Processing Board, as illustrated below.

Original Detecting

Filter (LPF)

Digital Image Processing

Boad (PWB-IB)

Shading Correction

:Light reflected from original

:Light reflected from EDH-1 pressure pad

:Reflected light, after passing through filter

The Image Monitor circuitry (within the Digital Image Processing board) extracts

the image data that is coming from the edges of the original.

The extracted edge data is used to calculate the original's size, its position, and

its skew. The results of these calculations are then used to determine the reading

area for the CCD sensor and scanning start point for the scanner.

Original Glass

Motor Driver

Scanner Motor

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