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piezo, thermal, bubble...

Some time ago I had it quite clear that each on the big 3 inkjet manufacturers used a distinctly different technology.

Please correct me if I'm wrong: About 4 years ago situation was like this:

Epson : piezo inkjet heads: head is fixed on printer, cartridge only has ink (and ink counter chips) ; in small printers head replacement is not practical because it costs more than printer itself, in big printers it's practical ; heads should last for over a year typically before needing replacement

HP: thermal inkjet heads: head is on the cartridge, so when you change ink you're changing head too

Canon: Bubblejet , similar technology to Thermal but relying on air thermal expansion instead of ink thermal expansion ; heads were also part of ink cartridge

but now situation seems to have changed... HP's midrange printers (and some small ones) now have cartridges that doesn't include heads in them. Same goes with Canon. But HP's heads are still a consumable, supposed to be changed after a certain (relatively small) number of cartridge changes. Not so with Canon, which seems to be similar to Epson's approach.

So, what's inside each of this printers nowadays?
Epson 2400, 4800, etc.... clearly still piezo, head should last for long time (over a year typically)
Canon i9100, i9950, W2200.... ???
HP 10ps, DesignJet 30 ??

best regards,

-- Roberto Michelena
   Infinitek
   Lima, Peru
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