Liquid ejection head and recording device

Abstract

A liquid ejection head having a channel member which includes an ejection hole surface and a pressurization chamber surface opposite thereto. An actuator substrate overlaps the pressurization chamber surface. The channel member includes a plurality of ejection holes opening in the ejection hole surface, a plurality of pressurization chambers individually communicating with the plurality of ejection holes and arranged in plan view of the pressurization chamber surface, and a plurality of dummy pressurization chambers positioned outside of the predetermined region in plan view of the pressurization chamber surface. The actuator substrate includes a plurality of pressurization portions that individually pressurize the pressurization chambers, and a plurality of dummy pressurization portions that individually pressurize the dummy pressurization chambers. The dummy pressurization chambers communicate with each other via a plurality of communication paths. A closed space including the plurality of dummy pressurization chambers and the plurality of communication paths is hermetically closed.

The invention claimed is: 
     
       1. A liquid ejection head comprising:
 a channel member comprising
 a first surface and a second surface opposite to the first surface, 
 a plurality of ejection holes opening in the first surface, 
 a plurality of pressurization chambers individually communicating with the plurality of ejection holes and arranged in a predetermined region in a plan view of the second surface, 
 a plurality of dummy pressurization chambers positioned outside of the predetermined region in the plan view of the second surface; and 
 
 an actuator substrate overlapping the second surface of the channel member, comprising
 a plurality of pressurization portions that individually pressurizes the plurality of pressurization chambers, and 
 a plurality of dummy pressurization portions that individually pressurizes the plurality of dummy pressurization chambers; 
 
 wherein the plurality of dummy pressurization chambers communicates with each other via a plurality of communication paths, and 
 wherein a closed space comprising the plurality of dummy pressurization chambers and the plurality of communication paths is hermetically closed. 
 
     
     
       2. The liquid ejection head according to  claim 1 ,
 wherein the channel member comprises a plurality of plates stacked from the first surface toward the second surface, 
 wherein the plurality of plates comprises a cavity plate constituting the second surface, 
 wherein the cavity plate comprises an opening, adjacent to the second surface, that is at least a part of each of the plurality of pressurization chambers and the plurality of dummy pressurization chambers, 
 wherein the actuator substrate overlaps the second surface and closes the plurality of pressurization chambers and the plurality of dummy pressurization chambers, and 
 wherein the plurality of communication paths comprises a communication path constituted by a concave groove positioned in a surface of the cavity plate opposite to the second surface. 
 
     
     
       3. The liquid ejection head according to  claim 1 ,
 wherein the plurality of communication paths comprises a communication path that linearly connects positions in the plurality of dummy pressurization chambers that are adjacent to each other, the positions being closest to each other. 
 
     
     
       4. The liquid ejection head according to  claim 1 ,
 wherein the channel member comprises
 a first route comprising at least one of the plurality of communication paths, the first route connecting a predetermined two dummy pressurization chambers of the plurality of dummy pressurization chambers to each other, and 
 a second route comprising at least another of the plurality of communication paths, bypassing the first route, the second route connecting the predetermined two dummy pressurization chambers to each other. 
 
 
     
     
       5. The liquid ejection head according to  claim 4 ,
 wherein the predetermined two dummy pressurization chambers are adjacent to each other, and 
 wherein the second route comprises at least one of the dummy pressurization chambers other than the predetermined two dummy pressurization chambers. 
 
     
     
       6. The liquid ejection head according to  claim 1 ,
 wherein the plurality of pressurization chambers comprises a plurality of first pressurization chambers arranged in a predetermined direction parallel to the second surface,   wherein the plurality of dummy pressurization chambers comprises one or more first dummy pressurization chambers arranged, in succession to the plurality of first pressurization chambers, on one side of the plurality of first pressurization chambers in the predetermined direction, and   wherein a pitch between a first pressurization chamber of the plurality of first pressurization chambers, that is positioned at an end on the one side in the predetermined direction, and one of the first dummy pressurization chambers that is adjacent to the first pressurization chamber positioned at the end is smaller than a pitch of the plurality of first pressurization chambers.   
     
     
       7. The liquid ejection head according to  claim 1 ,
 wherein the plurality of pressurization chambers comprises a plurality of first pressurization chambers arranged in a predetermined direction parallel to the second surface, 
 wherein the plurality of dummy pressurization chambers comprises a plurality of first dummy pressurization chambers arranged in succession to the plurality of first pressurization chambers on one side in the predetermined direction, and 
 wherein a pitch of the plurality of first dummy pressurization chambers is smaller than a pitch of the plurality of first pressurization chambers. 
 
     
     
       8. The liquid ejection head according to  claim 1 ,
 wherein the plurality of pressurization chambers comprises a plurality of first pressurization chambers arranged in a predetermined direction parallel to the second surface,   wherein the plurality of dummy pressurization chambers comprises one or more first dummy pressurization chambers arranged, in succession to the plurality of first pressurization chambers, on one side of the plurality of first pressurization chambers in the predetermined direction, and   wherein a width of at least one of the one or more first dummy pressurization chambers in the predetermined direction is larger than a width of each of the plurality of first pressurization chambers in the predetermined direction.   
     
     
       9. The liquid ejection head according to  claim 1  claim,
 wherein the plurality of communication paths comprises
 a first communication path, and 
 a second communication path longer than the first communication path and having a cross-sectional area larger than a cross-sectional area of the first communication path. 
 
 
     
     
       10. The liquid ejection head according to  claim 1 ,
 wherein the channel member comprises a plurality of predetermined regions, and 
 wherein the plurality of dummy pressurization chambers is arranged to surround each of the plurality of predetermined regions. 
 
     
     
       11. A recording device comprising:
 the liquid ejection head according to  claim 1 ; and 
 a movement unit that moves the liquid ejection head and a recording medium relative to each other. 
 
     
     
       12. The recording device according to  claim 11 , comprising:
 a head chamber in which the liquid ejection head is accommodated; and 
 a controller, 
 wherein the controller controls at least one of a temperature, a humidity, and an air pressure of an inside of the head chamber. 
 
     
     
       13. The recording device according to  claim 11 , comprising:
 a coater that applies a coating agent to the recording medium. 
 
     
     
       14. The recording device according to  claim 11 , comprising:
 a drier that dries the recording medium. 
 
     
     
       15. The liquid ejection head according to  claim 1 ,
 wherein a size of at least one of the plurality of dummy pressurization chambers is different from a size of each of the plurality of pressurization chambers.    
     
     
       16. The liquid ejection head according to  claim 15 ,
 wherein the plurality of dummy pressurization chambers includes three or more dummy pressurization chambers, and the three or more dummy pressurization chambers are connected via communication paths that branch from each other among the plurality of communication paths.    
     
     
       17. The liquid ejection head according to  claim 1 , wherein the plurality of communication paths includes
 a first communication path, and   a second communication path having a width broader than a width the first communication path.    
     
     
       18. The liquid ejection head according to  claim 17 ,
 wherein a length of the second communication path is longer than a length of the first communication path.    
     
     
       19. The liquid ejection head according to  claim 18 ,
 wherein the plurality of dummy pressurization chambers includes a first dummy pressurization chamber, a second dummy pressurization chamber and a third dummy pressurization chamber which communicates with each other via the first communication path and the second communication path.    
     
     
       20. The liquid ejection head according to  claim 1 , wherein the plurality of communication paths includes
 a first communication path, and   a second communication path longer than the first communication path, and the second communication path connects the first communication path.    
     
     
       21. The liquid ejection head according to  claim 20 ,
 wherein, the second communication path having a cross-sectional area larger then a cross-sectional area of the first communication path.    
     
     
       22. The liquid ejection head according to  claim 21 ,
 wherein, the plurality of communication paths includes a third communication path connects a first dummy pressurization chamber of the plurality dummy pressurization chamber;   wherein, the third communication path having a cross-sectional area smaller than the cross-sectional area of the second communication path.    
     
     
       23. The liquid ejection head according to  claim 22 ,
 wherein a pitch between a first pressurization chamber of the plurality of pressurization chambers, that is positioned at an end on the one side in a predetermined direction, and the first dummy pressurization chamber that is adjacent to the first pressurization chamber positioned at the end is different from a pitch of the plurality of pressurization chambers.    
     
     
       24. The liquid ejection head according to  claim 23 ,
 wherein the pitch between the first pressurization chamber and the first dummy pressurization chamber is larger than the pitch between the first dummy pressurization chamber and another dummy pressurization chamber which is positioned opposite side to the first pressurization chamber with respect to the first dummy pressurization chamber in the predetermined direction.    
     
     
       25. The liquid ejection head according to  claim 24 ,
 wherein the first dummy pressurization chamber and said another chamber communicate with each other via the third communication path.    
     
     
       26. The liquid ejection head according to  claim 25 ,
 wherein a width of the first dummy pressurization chamber in the predetermined direction is different from a width of each of the plurality of pressurization chambers in the predetermined direction.