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BJC-2000
3.2.4 Bubble head unit structure
1) Bubble jet nozzles
The ink held by the sponge goes through a mesh-type ink filter and flows to the
bubble jet nozzles through the joint pipe.
When the head-drive current is supplied to the heater board, an ink bubble is
produced. Eventually, only one ink bubble is formed. The head-drive current is
turned off before the ink droplet leaves the nozzle. The bubbling however continues
with the residual heat and the ink droplets are ejected from the nozzles.
After an ink droplet is ejected, the nozzle is replenished with more ink from the ink
sponge.
NOTE
Heater Plate
Bubble Jet Nozzle
Start of heater power
1
2
While heater power is on
3
End of heater power
Bubble contraction,
4
ink bubble formation
5
Ink droplet ejection
The print head's heater board uses semiconductor technology with the
heater and circuitry built on a silicon plate.
This silicon plate, which contains electrical circuitry, is attached to an
aluminum base. The plastic cover, which is shaped to fit the nozzles, is
also attached.
Extra Fine Wire
Connecting Section
Protection Bond of Wire
Connecting Section
Silicon Plate
Aluminum Plate
Figure 4-10 Bubble Jet Nozzles (Partial View)
Signal Circuit
Print Board
Plastic Cover
Common Ink Chamber
Face Plate (Part of plastic cover)
4-13
Part 4: Technical Reference
Ink Path from Ink Sponge
Ink Filter
Joint Pipe
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