Original Scanning - Riso ComColor X1 series Technical Manual

2-2. Original Scanning

Mechanism
Main parts layout drawing (Scanner top view)
Original detection senor 4
Original detection sensor 5
Original detection sensor 6
1. Scanner Module
The input is paper image. The output is image signal.
It is a box type unit with the function to scan paper originals by moving in parallel to the original.
The box-shape Scanner module consists of LED light, Lens, Mirrors and CCD PCB.
2 pieces of high-intensity white-colored LED are used. The LEDs are located on the rear and stick type
light-guide-panel is used to illuminate the whole length of the Scanner module, known as edge-light
method. In the past fluorescent lamps were used for the same purpose. The two LED lights illuminates
on the paper original at approximately 45 degrees from the two sides to eliminate the shades.
• Lens are used for the purpose of reduced-projection-exposure, in which the reflected image of the original is
gathered and exposed onto the CCD Image sensor. The lens consists of several pieces placed one after the
other. The reduced-projection-exposure system is required for the reason that the CCD is only about 1/10 of the
size of the paper original. For the reduced-projection-exposure to work effectively, the lens location is far from the
original but close to the CCD. The distance from the original to the CCD is approximately 400 to 500 millimeters.
The distance from the lens to the CCD is approximately 50 millimeters.
• The function of the mirrors is to transfer the illuminated image of the original to the lens. Several sets of mirrors
are used to reflect the image back and forth to direct the image to the Scanner module, producing the distance
needed.
• CCD Image Sensor (Charge Coupled Device Image Sensor) is one of the image sensors which is an image
capturing semiconductor device commonly used in both video cameras and digital cameras. The CCD contains
7,000 pieces of microscopic optical sensors in one straight line, each the size of 5 micrometer rectangular shape.
In the case of a color CCD, these microscopic sensors exist in 3 to 4 rows, each row with different color filter. Any
dust adhering to the CCD or mirrors results in poor image
Original detection sensor
Original detection sensor 1
Original detection sensor 2
Original detection sensor 3
Scanning direction
Scanning section
Guide shaft
Scanner Module
[ 20-5 ]
HS5000 Scanner option
Scanner Motor
x1 Series ComColor (Revision 0.9)