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(11) | EP 0 865 921 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Piezoelectric element driving circuit and ink jet recording apparatus |
| (57) A piezoelectric element driving circuit drives a plurality of piezoelectric elements
having common electrodes and independent electrodes which are driven independently.
The piezoelectric element driving circuit includes a first switch circuit (25; 25-1
to 25-n) enabling each of a plurality of piezoelectric elements of a first piezoelectric
element group (34) having the common electrodes coupled in common in response to a
first enable signal, a second switch circuit (26) enabling each of a plurality of
piezoelectric elements of a second piezoelectric element group (35) in response to
a second enable signal, where the piezoelectric elements of the second piezoelectric
element group are different from the piezoelectric elements of the first piezoelectric
element group, and a driving circuit part (31, 32, 33-1 to 33-n) driving in common
the independent electrodes of the corresponding piezoelectric elements of the first
and second piezoelectric element groups based on recording data. |