| 摘要 |
PROBLEM TO BE SOLVED: To suppress displacement (curving) of a nozzle array formed in a nozzle sheet of a printer head. SOLUTION: In the printer head provided with the nozzle sheet where nozzles 18 for discharging ink liquid drops are formed, a head frame for supporting the nozzle sheet, and a substrate member which has a heating resistor for heating ink and is bonded to the nozzle sheet, the head frame and the substrate member have nearly equal coefficients of linear expansion, and the nozzle sheet has a coefficient of linear expansion larger than the coefficients of linear expansion of the head frame and the substrate member. Openings 19 for joining electrodes of the substrate member are formed in the nozzle sheet, and moreover, openings, 20 are formed at the opposite side region via an array of the nozzles 18 to a region where the openings 19 are formed. The openings 20 are formed to have the opening area gradually reduced from an edge part of the head frame 2 towards a center part. COPYRIGHT: (C)2003,JPO
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