Optics Unit - Panasonic DP-150 Service Manual

5.Optics Unit

1)Construction of the optics unit
•
The optics unit consists of the exposure (fluorescent) lamp, the lens, the CCD
sensor and the reflecting mirrors.
•
The optics motor moves the full-speed unit exposing the original with the exposure lamp.
The reflection from the original is gathered on the CCD image sensor via lens, where optics
signals can be converted into electrical signals. (photoelectric conversion)
When this photoelectric conversion is performed, image information is converted
into pixel signals according to image density.
•
The electrical signals (analog signals) are converted into digital signals by the
CCD control PCB and they are transmitted to the image processing unit in the
control PCB of the main body.
•
When the laser beam equivalent to the image processing is emitted, charge on the
drum disappears.
7
6
Component name
1 Full-speed unit
2 Half-speed unit
3 Optics unit drive motor
4 Drive wire
5 Lens
6 CCD image sensor
7 Exposure lamp
2-12
2 5 1 3
4
Optics unit
Description
Consist of the exposure lamp and the no.1
mirror. Scan the original.
Consist of the no.2 and no.3 mirrors. Guide the reflected
light from the no.1 mirror. Keep the optical path length
constant between the original and lens by scanning at half-
speed of the full-speed unit.
Stepping motor. Drives the full-speed and half-speed unit.
Transmit driving force from the optics unit to
the full-speed and half-speed unit.
Form image on the CCD image sensor of the
reflected light from the original.
Convert optical signals into electrical signals.
Fluorescent. Light up the original.