Copying Process - Minolta Di 620 Manual

1155SBM0200A
2

COPYING PROCESS

1. Photoelectric
Conversion Section
17. Upper Paper
20. Lower Paper
Exit Switch
1. Photoelectric Conversion Section
The exposure lamp directs light onto the original. The light reflected from the original is
directed and resized by the various mirrors and lenses so as to produce a reduced-size
image on the CCD sensor.
The CCD sensor converts the reduced image into an electrical signal. The signal is out-
put to the IR image-processing section.
2. IR Image-Processing Section
This section converts the electric signal from the photoelectric conversion section into an
8-bit digital image signal (A/D conversion), applies appropriate correction processing,
and outputs the result to the memory section.
3. Memory Section
This section compresses the data received from the IR Image-Processing Section. The
section can store data for up to 200 A4-size sheets (assuming a B/W ratio of 6%). Stored
data can then be expanded in various ways in accordance with selected functions.
4. PH Image-Processing Section
This section applies correction processing to the digital signal output from the memory
section, then converts the result (D/A conversion) into an electrical signal that controls
the output level from the laser diode (LD).
5. Laser Exposure
The laser beam emitted from the LD strikes the surface of the PC drum, creating a latent
(electrostatic) image.
6. PC Drum
The drum is an aluminum cylinder coated with photosensitive material. The action of the
laser generates an electrostatic pattern (latent image) onto the drum surface.
7. Drum Charging
A scorotron charger (with 2 comb electrodes) generates a negative DC charged layer on
the surface of the drum.
8. Image Development
Negatively charged toner from the developer mixing chamber adheres to the latent image
on the drum surface, creating a visible image.
AC/DC bias voltage is applied to the sleeve roller to prevent toner from adhering to the
white background areas of the image.
9. Paper Feed
This section feeds sheets from the appropriate feed source (feed drawer or manual-feed
tray).
2. IR Image-Processing
Section
14. Main Erase
13. Cleaning
Exit Switch
16. Fusing
18. Turnover
3. Memory
Section
7. Drum
Charging
6. PC Drum
11/12.
15. Transport
Separation
19. Duplex Unit
M-3
4. PH Image-Processing
Section
5. Laser Exposure
8. Image Development
10. Image
9. Manual Feed
Transfer
9. Paper Feed
1155M079CB