| CPC B41J 2/14233 (2013.01) | 18 Claims |
|
1. A liquid ejecting head comprising:
a pressure chamber substrate in which wall surface portions of a pressure chamber in communication with a nozzle are formed;
an diaphragm that is provided on a first surface side of the pressure chamber substrate in a laminating direction and forms a top surface portion of the pressure chamber;
a piezoelectric element that is provided on the diaphragm; and
a communication plate that is provided on a second surface side opposite to the first surface of the pressure chamber substrate in the laminating direction and forms a bottom surface portion of the pressure chamber,
wherein a third surface of the communication plate is bonded to the second surface of the pressure chamber substrate by an adhesive and forms the bottom surface portion,
the third surface is provided with a supply opening that supplies a liquid to the pressure chamber and a discharge opening that guides a liquid in the pressure chamber to the nozzle,
the pressure chamber is longitudinal in a first direction when viewed in the laminating direction,
at one end of the bottom surface portion in the first direction, a first acute angle portion is formed by the wall surface portions that mutually form an acute angle,
at another end of the bottom surface portion in the first direction, a second acute angle portion is formed by the wall surface portions that mutually form an acute angle,
the first acute angle portion does not overlap with the supply opening and the discharge opening when viewed in the laminating direction,
the second acute angle portion does not overlap with the supply opening and the discharge opening when viewed in the laminating direction,
the piezoelectric element has an active portion in which a piezoelectric body laminate is sandwiched between a first electrode and a second electrode,
when a section, of the pressure chamber, whose position in the first direction is same as a position of the active portion is a vibrating section,
a direction that intersects with the laminating direction and the first direction is a second direction,
a virtual straight line that passes through a center in the second direction in the vibrating section and extends in the first direction is a central line, and
the first acute angle portion and the second acute angle portion are provided on mutually opposite sides with respect to the central line when viewed in the laminating direction,
the pressure chamber has the vibrating section, a supply section, and a discharge section,
the supply section includes the first acute angle portion and is adjacent to one end of the vibrating section in the first direction, a part of the supply section overlapping with the supply opening in the laminating direction,
the discharge section includes the second acute angle portion and is adjacent to another end of the vibrating section in the first direction, a part of the discharge section overlapping with the discharge opening in the laminating direction,
the pressure chamber has
a first boundary portion that extends in the first direction from the first acute angle portion as a starting point along a boundary between one of the wall surface portions and the top surface portion, and
a second boundary portion that extends in the first direction from the second acute angle portion as a starting point along a boundary between one of the wall surface portions and the top surface portion, and
when viewed in the laminating direction,
an interval in the second direction between the central line and the first boundary portion increases as approaching from the first acute angle portion to the vibrating section, in the supply section, and
an interval in the second direction between the central line and the second boundary portion increases as approaching from the second acute angle portion to the vibrating section, in the discharge section.
|