JP2009136519A5 - - Google Patents

Claims (11)

A fluid ejection device that ejects fluid from a fluid ejection opening by changing the volume of a fluid chamber ,
A tube for supplying a fluid to the fluid chamber;
A fluid ejecting portion disposed at a tip of the tube,
In the fluid ejecting section, a plurality of variable volume chambers are connected in series via a communicating path between an inlet channel communicating with one end of the tube and an outlet channel communicating with a fluid ejecting opening for ejecting fluid. Arranged,
A fluid jet characterized in that, in a cross-sectional area perpendicular to a fluid flow direction, each cross-sectional area of the communication path, the outlet flow path, and the inlet flow path is smaller than a cross-sectional area of the fluid chamber. apparatus. The fluid ejection device according to claim 1,
A plurality of the variable volume chambers are provided in each of the variable volume chambers, the communication passage that connects the fluid chambers to each other, the fluid ejection opening, and the outlet flow that communicates with one of the fluid chambers. A thin plate-like spacer that forms a channel and a side wall of each of the inlet channels, a diaphragm that is in close contact with both the front and back surfaces of the spacer, and a piezoelectric element that is provided on the outer surface of the fluid chamber of the diaphragm; A fluid ejecting apparatus comprising: The fluid ejection device according to claim 1 or 2,
The inlet channel, the fluid chamber , the communication channel, and the outlet channel, so that the flow center of the inlet channel, the fluid chamber , the communication channel, and the outlet channel is linear. A fluid ejecting apparatus which is arranged. The fluid ejection device according to any one of claims 1 to 3 ,
The fluid ejecting apparatus according to claim 1, wherein a width of a side of the communication passage where the fluid flows into the fluid chamber is larger than a width of the side of the fluid flowing out of the fluid chamber. The fluid ejection device according to any one of claims 1 to 4 ,
The fluid ejecting apparatus according to claim 1, wherein the fluid ejecting section has a cylindrical shape, and the diameter of the fluid ejecting section is substantially equal to the diameter of the tube. In the fluid ejection device according to any one of claims 1 to 5 ,
At least one of the plurality of variable volume chambers, excluding the variable volume chamber communicating with the fluid ejection opening, is a reservoir that retains fluid. The fluid ejection device according to any one of claims 1 to 6 ,
The fluid ejecting apparatus according to claim 1, wherein the volume change timings of the fluid chambers of the plurality of variable volume chambers are matched. The fluid ejection device according to any one of claims 1 to 6 ,
The fluid ejecting apparatus according to claim 1, wherein, among the plurality of variable volume chambers, the volume changing chamber on the outlet flow channel side is preceded by a volume change timing of the fluid chamber in the variable flow chamber on the inlet flow channel side. The fluid ejection device according to any one of claims 1 to 6 ,
A fluid ejecting apparatus that delays the volume change timing of the fluid chamber of the volume variable chamber on the inlet flow channel side with respect to the volume variable chamber on the fluid ejecting opening side among the plurality of variable volume chambers. The fluid ejection device according to claim 8 or 9 , wherein
The fluid ejecting apparatus according to claim 1, wherein a leading time or a delay time of the volume change timing is within a half cycle of the driving signal. A medical device comprising the fluid ejection device according to any one of claims 1 to 10.