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BJC-50
3.2.3 Bubble jet head-unit structure
a) Bubble jet nozzles
The ink in the ink sponge is filtered through a meshed ink filter, and is fed to the
bubble-jet nozzles through the ink path in the holder. When the head-drive-current
flows to the heater board of each nozzle, ink is heated up, and bubbles are produced
and subsequently form into one large bubble. The head drive current is cut off
before a drop of ink is ejected from the nozzle, but bubbling continues due to the
heat remaining in the heater and the drop of ink is ejected from the nozzle.
After ejecting the ink drop, the nozzle is refilled with ink.
Heater Plate
Bubble Jet Nozzle
Start of Heater Power
1
While Heater Power is on
2
End of Heater Power
3
Bubble Contraction,
4
Ink Bubble Formation
Ink Drop Jetting
5
The heaters and their electrical elements within the bubble jet head are
formed on a silicon plate by means of semiconductor technology.
A photosensitive resin layer (nozzle wall) and plastic cover are bonded to
the silicon plate, and nozzles are made in the photosensitive resin layer by
laster.
Extra Fine Wire
Connecting Section
Protection Bond of Wire
Connecting Section
Silicon Plate
Aluminum Plate
Figure 4-16 Bubble Jet Head
Signal Circuit
Print Board
Ink Path from Ink Cartrige
Plastic Cover
Common Ink Chamber
Face Plate (Part of Plastic Cover)
4-23
Part 4: Technical Reference
Ink Filter
Joint Pipe
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