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4-13
BJC-2000
Part 4: Technical Reference
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.
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.
NOTE
Plastic Cover
Signal Circuit
Print Board
Extra Fine Wire
Connecting Section
Protection Bond of Wire
Connecting Section
Silicon Plate
Aluminum Plate
Heater Plate
Bubble Jet Nozzle
Common Ink Chamber
Face Plate (Part of plastic cover)
Joint Pipe
Ink Filter
Ink Path from Ink Sponge
Start of heater power
While heater power is on
End of heater power
Bubble contraction,
ink bubble formation
Ink droplet ejection
1
2
4
5
3
Figure 4-10 Bubble Jet Nozzles (Partial View)
Содержание Color Bubble Jet BJC-2000 Series
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