(2) Scanner section

1) How to scan documents

The scanner has sensors that are arranged in a line. These sensors

scan a certain area of a document at a time and deliver outputs se-

quentially. When the line is finished, the next line is scanned, and this

procedure is repeated. The figure below shows the case where the lat-

ter two sections of an image which are scanned are shown with solid

lines and the former two sections which are being transmitted are

shown with dotted lines.

The direction of this line is called “main scanning direction,” and the

scanning direction “sub scanning direction.”

In the figure above, one line is divided into 4 sections. Actually, how-

ever, one line is divided into thousands of sections. For scanning, the

light receiving element called CCD is used.

The basic resolution indicates the scanner capacity. The basic resolu-

tion is expressed in dpi (dot/inch) which shows the number of light

emitting elements per inch on the document.

The basic resolution of this machine is 400dpi.

In the sub scanning direction, at the same time, the motor that drives

the optical system is controlled to scan the image at the basic resolu-

tion.

2) Basic structure of scanner section

1 Copy lamp (Xenon lamp) 2 Reflector (light conversion plate) 3 No. 1 mirror

4 No. 2 mirror 5 No. 3 mirror 6 Lens

7 No. 2/3 mirror unit 8 Copy lamp unit 9 CCD

10 Mirror motor 11 MHPS (Mirror home position sensor)

The scanner unit performs scanning in the digital optical system.

The light from the light source (Xenon lamp) is reflected by a document and passed through three mirrors and reduction lenses to

the CCD element (image sensor) where images are formed. This system is known as the reduction image sensor system. Photo ener-

gy on the CCD element is converted into electrical signals (analog signals). (Photo-electric conversion). The output signals (analog

signals) are converted into digital signals (A/D conversion) and passed to the MCU (main control/image process section). The resolu-

tion at that time is 400dpi.

The mirror unit in the scanner section is driven by the mirror motor.

The MHPS is provided to detect the home position of the copy lamp unit.

(6)(5)

(4)

(3)

(2)

(1)

(10)

(11)

(9)

(8)

(7)

5 4 3 2

Sub scanning direction

Sensor scanning area

Main

scanning

direction

Original

Image data sent to the ICU PWB

To MCU PWB

AL-1000/1010

7-2

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 106 107

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