Ricoh M-G1a - Page 57

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Model: M-G1a/M-G1b/M-G1L/M-G1W/R-
G1
Machine Codes:
J017/J019/J021/J023/J018
Slide 57
 Each print head uses piezo-electric elements (PZT), which
force ink from ink reservoirs, out of ink nozzles, and then
onto paper.
 This is done with pressure. At prescribed time, electric
charge is applied to PZT, making PZT expand.
 Expansion of PZT puts pressure on ink, forcing it out of
ejection port.
 This is a unique design that has several technical
advantages over bubble-jet printers, such as faster
printing speeds and more durable ink.
 By reshaping Piezo elements using electronic signals,
various ink drop sizes can be made.
 Piezo system supports two-bit / multi-bit controller with
only one nozzle.
 Piezo elements are expensive.
Big drop
Small drop
Add Electric
Voltage
Nozzles - 1/2
Note: View above is of head with it’s surface cover removed.