US 12,011,924 B2
Liquid ejection apparatus and capacitive load drive circuit
Noriaki Saito, Nagano (JP); and Masashi Kamiyanagi, Nagano (JP)
Assigned to Seiko Epson Corporation, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Oct. 27, 2021, as Appl. No. 17/511,629.
Claims priority of application No. 2020-181177 (JP), filed on Oct. 29, 2020.
Prior Publication US 2022/0134740 A1, May 5, 2022
Int. Cl. B41J 2/045 (2006.01); B41J 2/14 (2006.01)
CPC B41J 2/04581 (2013.01) [B41J 2/04588 (2013.01); B41J 2/04596 (2013.01); B41J 2002/14491 (2013.01)] 10 Claims
OG exemplary drawing
 
7. A capacitive load drive circuit comprising:
a head unit including
a first piezoelectric element that is actuated according to a first drive signal and a second drive signal that are selectively supplied to the first piezoelectric element, and
a second piezoelectric element that is actuated according to the first drive signal and the second drive signal that are selectively supplied to the second piezoelectric element; and
a flexible flat cable including
first wiring electrically connectable to the first piezoelectric element and the second piezoelectric element for selectively supplying the first drive signal to the first piezoelectric element and the second piezoelectric element,
second wiring electrically connectable to the first piezoelectric element and the second piezoelectric element for selectively supplying the second drive signal to the first piezoelectric element and the second piezoelectric element,
third wiring that is electrically coupled to one end of the first piezoelectric element and holds the one end of the first piezoelectric element at a constant potential, and
fourth wiring that is electrically coupled to one end of the second piezoelectric element and holds the one end of the second piezoelectric element at a constant potential, wherein
the first drive signal
transitions from a first potential to a second potential in a first period,
maintains the second potential during a second period following the first period, and
transitions from the second potential to the first potential in a third period following the second period,
the second drive signal
transitions from a third potential to a fourth potential in a fourth period,
maintains the fourth potential during a fifth period following the fourth period, and
transitions from the fourth potential to the third potential in a sixth period following the fifth period,
the first period and the fourth period overlap with each other in part or in whole,
the third period and the sixth period overlap with each other in part or in whole,
the second potential is higher than the first potential,
the fourth potential is lower than the third potential, and
the first wiring and the second wiring are both disposed between the third wiring and the fourth wiring.