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Part 4: Technical Reference
3.2.3 Photo BJ cartridge structure
The photo BJ cartridge has a print head equipped with 136 nozzles through which the
four ink colors are ejected (24 nozzles each for yellow, magenta, and cyan; 64 nozzles
for black).
1) Pressure adjusting plate
As the ink is consumed, the pressure inside the cartridge decreases in relation to
the atmospheric pressure. This makes it harder for the ink to be supplied to the
head. To prevent this, the ink cartridge is provided with a pressure adjusting hole
for maintaining constant pressure inside the cartridge body.
2) Ink sponges
Each ink color (black, cyan, yellow, magenta) is soaked in its own respective sponge.
The cyan, yellow, and magenta ink sponges are compressed and stored in the
cartridge body.
3) Ink passage section
This is a passage through which the ink flows from the ink cartridge to the head unit.
4) Bubble jet head unit
From the ink cartridges, the four ink colors are supplied separately to the 136
bubble jet nozzles. Ink for the four colors is ejected through the 136 bubble jet
nozzles, according to the print signals received through the signal contacts.
Ink Filter
Ink Passage Section
136 Bubble Jet Nozzles
Faceplate
Figure 4-9 Photo BJ Cartridge Structure
Pressure Adjusting Plate
Ink Sponge
Aluminum Plate
Signal Contact
Bubble Jet Head Unit
4-12
BJC-2000
Ink Sponge
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