2HJ/2HK
2-1-15
(3) LED print head
The LED print head is comprised of SELFOC lens array, and an LPH PWB. The LPH PWB arrays 5184 of LED chips in
line. It also includes the driver circuit for the LED chips. The light which is switched on and off depending on video data
irradiate the drum through the SELFOC lens, to form an image. The LED print head is of 600 dpi, therefore the exposure
of the light is as dense as 600 dots per a inch. The EEPROM on the LPH PWB stores data for compensation of fluctuation
of luminosity over all LED chips in the array.
Figure 2-1-19LED print head
SELFOC lens
(array)
LED chips
(5184 pieces)
LPH PWB
EEPROM
Dot
Drum
600 dot/inch
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