Laser process for making a filter for an ink jet

Abstract

A common recess, grooves, and common recess and/or column members in the grooves are formed on a base board at the same time, and such board is made a second base board, which is coupled to a first base board on which elements for liquid discharging energy are formed; hence obtaining an ink jet recording head provided with a filter unit in an arbitrary position in the region formed by the ink paths and the common liquid chamber. The filter unit can be processed by a single processing in the ink paths and/or the common liquid chamber to make it possible to prevent disabled discharge from taking place due to dust particles intermingled at the time of head manufacture. In this way, the discharging stability is enhanced, making a high-speed printing possible. A workpiece is efficiently processed by a single processing which is performed to process a three-dimensional configuration with respect to the direction in which the laser beam is irradiated.

1. A method for manufacturing an ink jet recording head, comprising the steps of:
 forming on a base board a recess portion serving as a part of an ink passage leading to  communicating with an ink discharge opening  portion and a projection having a shape in said the ink passage by a laser irradiation through a mask portion having a predetermined mask pattern corresponding to the shape of said the projection, wherein said the mask pattern at least one of reflects and or absorbs at least a part of said the laser irradiation; radiation; and  
 forming said the ink passage by coupling a side of said the base board on which said the recess portion is formed to another base board.  
 
     
     
       2. A method for manufacturing an ink jet recording head according to  claim 1 , wherein said the ink passage comprises a plurality of flow paths communicating with respective said ink discharge openings in the ink discharge portion and a common liquid chamber communicating with said the flow paths. 
     
     
       3. A method for manufacturing an ink jet recording head according to  claim 2 , wherein said the projection comprises a filter, and said the projection is disposed in a given said one of the flow paths. 
     
     
       4. A method for manufacturing an ink jet recording head according to  claim 3 , wherein said the projection is column-shaped. 
     
     
       5. A method for manufacturing an ink jet recording head according to  claim 2 , wherein said the projection comprises a filter located in the vicinity of an opening communicating with said flow paths in said the common liquid chamber, the opening communicating with the flow paths. 
     
     
       6. A method for manufacturing an ink jet recording head according to  claim 5 , wherein said the projection is column-shaped. 
     
     
       7. A method for manufacturing an ink jet recording head according to  claim 2 , wherein said the common liquid chamber is formed by molding and said the flow paths is are formed by laser processing. 
     
     
       8. A method for manufacturing an ink jet recording head according to  claim 1 , wherein an energy generation means for generating energy for discharging the ink from said discharge opening the ink discharge portion is provided at a portion on said the other board corresponding to the a position of said the ink passage. 
     
     
       9. A method for manufacturing an ink jet recording head according to  claim 8 , wherein said the energy generating means is an electro-thermal energy conversion element which generates heat energy as said the energy. 
     
     
       10. A method for manufacturing an ink jet recording head, wherein comprising the step of:
   forming  a recess portion serving as an ink passage communicating with an ink discharge portion and a projection having a shape and provided in saidthe ink passage are formed by a laser irradiation through a mask portion having a predetermined mask pattern corresponding to the shape of saidthe projection, wherein saidthe mask pattern at least one of reflects andor absorbs at least a part of saidthe laser irradiationradiation.  
 
     
     
       11. A method for manufacturing an ink jet recording head according to  claim 10 , wherein said the ink passage comprises a plurality of flow paths communicating with respective said ink discharge openings in the ink discharge portion and a common liquid chamber communicating with said the flow paths. 
     
     
       12. A method for manufacturing an ink jet recording head according to  claim 11 , wherein said the projection comprises a filter located in a given said one of the flow paths. 
     
     
       13. A method for manufacturing an ink jet recording head according to  claim 12 , wherein said the projection is column-shaped. 
     
     
       14. A method for manufacturing an ink jet recording head according to  claim 11 , wherein said the projection comprises a filter located in the vicinity of an opening communicating with said flow paths in said the common liquid chamber, the opening communicating with the flow paths. 
     
     
       15. A method for manufacturing an ink jet recording head according to  claim 14 , wherein said the projection is column-shaped. 
     
     
       16. A method for manufacturing an ink jet recording head according to  claim 10 , wherein an energy generating means for generating energy for discharging the ink from said the ink discharge opening portion is provided in said liquid the ink passage. 
     
     
       17. A method for manufacturing an ink jet recording head according to  claim 16 , wherein said the energy generating means is an electro-thermal energy conversion element which generates heat energy as said the energy. 
     
     
       18. A method for manufacturing a board member for use in an ink jet recording head, the board member including a recess that serves as part of an ink passage in fluid communication with an ink discharge opening and a plurality of protrusions arranged in the recess, said method comprising the steps of:
   providing a board member formed of polymer resin; and        irradiating a laser beam through a mask portion having a mask pattern corresponding to a shape of the plurality of protrusions, the mask pattern reflecting at least a part of the laser beam or absorbing at least a part of the laser beam.