Table of Contents
Advertisement
• BJ print head unit
The ink that is supplied from the ink sponge is sent to the BJ nozzles
according to print signals that arrive from the signal contact pad.
Aluminum plate
Heater plate
Ink ejection hole
(1) Heater energized.
(minute bubbles
heat up)
(2) Heater on.
(individual bubbles
merge to become
one large bubble)
(3) Heater off.
(bubble continue
to expand, using
residual heat)
(4) Bubble decrease
in size,ink droplet
formed.
(5) Ink droplet ejected ink
refilled from ink chamber.
The ink in the ink sponge is filtered by the ink filter to remove any dust,
and is sent to the BJ nozzles via the joint pipe. When head drive current
flows to the heater plate inside the nozzles, the ink boils to be formed into
numerous bubbles. Eventually, these bubbles become a single boiling bub-
ble. Though the head drive current is stopped before the ink droplets leave
the nozzles, bubbling by remaining heat from the heater continues to dis-
charge ink droplets from the nozzle tips. After ink droplets are ejected
from the nozzles, the nozzles are charged with ink again from the ink
sponge.
Filament contacts
Protective bond for
filament contacts
Silicon plate
Ink chamber
Face plate
(part of plastic cover)
Fig. 4-66 BJ Print Head
RECORDING SECTION
Printed circuit board
Signal circuit
Flow of ink
s
from ink sponge
Ink filter
Joint pipe
Plastic cover
4–59
1
2
3
4
5
6
ït
çi
Advertisement
Table of Contents
