Droplet jet head and droplet jet applicator
A droplet jet head includes: a base member holding a plurality of piezoelectric elements; a vibration plate provided on the base member and vibrated by each of the plurality of piezoelectric elements; a liquid chamber plate provided on the vibration plate and forming wall surfaces of a plurality of liquid chambers containing liquid; a nozzle plate provided on the liquid chamber plate and having a plurality of nozzles communicating with the plurality of liquid chambers, respectively; a holder plate provided on the liquid chamber plate in a manner of covering the nozzle plate and having an opening which exposes each of the plurality of nozzles; a buffer member provided between the holder plate and the nozzle plate; and a plurality of screws fastening the base member, the vibration plate, the liquid chamber plate and the holder plate.
1. A droplet jet head comprising:
a base member which holds a plurality of piezoelectric elements;
a vibration plate which is provided on the base member and vibrated by the plurality of piezoelectric elements;
a liquid chamber plate which is provided on the vibration plate, and which forms wall surfaces of a plurality of liquid chambers containing liquid, the capacities of the liquid chambers being changed by the vibration plate;
a nozzle plate which is provided on the liquid chamber plate, and which has a plurality of nozzles communicating with the plurality of liquid chambers, respectively;
a holder plate which is provided on the liquid chamber plate in a manner of covering the nozzle plate, and which has an opening exposing the plurality of nozzles;
a buffer member which is provided between the holder plate and the nozzle plate; and
a plurality of screws which fasten the base member, the vibration plate, the liquid chamber plate and the holder plate,
wherein the nozzle plate is formed such that an area where the nozzles are formed protrudes from the opening in a state where the nozzle plate is joined with the holder plate.
2. The droplet jet head according to claim 1 , wherein the holder plate is formed of a material which produces a compressive strength greater than that of the nozzle plate.
3. The droplet jet head according to claim 1 , wherein the nozzle plate includes an orifice plate where the plurality of nozzles are formed.
4. A droplet jet applicator comprising:
a droplet jet head; and
a main body which holds the droplet jet head as well as supplies ink to the droplet jet head,
wherein the droplet jet head includes:
a base member which holds a plurality of piezoelectric elements;
a vibration plate which is provided on the base member and vibrated by the plurality of piezoelectric elements;
a liquid chamber plate which is provided on the vibration plate, and which forms wall surfaces of a plurality of liquid chambers containing liquid, the capacities of the liquid chambers being changed by the vibration plate;
a nozzle plate which is provided on the liquid chamber plate, and which has a plurality of nozzles communicating with the plurality of liquid chambers, respectively;
a holder plate which is provided on the liquid chamber plate in a manner of covering the nozzle plate, and which has an opening exposing the plurality of nozzles;
a buffer member which is provided between the holder plate and the nozzle plate; and
a plurality of screws which fasten the base member, the vibration plate, the liquid chamber plate and the holder plate,
wherein the nozzle plate is formed such that an area where the nozzles are formed protrudes from the opening in a state where the nozzle plate is joined with the holder plate.
5. The droplet jet applicator according to claim 4 , wherein the holder plate is formed of a material which produces a compressive strength greater than that of the nozzle plate.
6. The droplet jet applicator according to claim 4 , wherein the nozzle plate includes an orifice plate where the plurality of nozzles are formed.