DROPLET DISCHARGE HEAD, METHOD FOR PRODUCTION THEREOF, LIQUID CARTRIDGE, AND DROPLET DISCHARGE RECORDING DEVICE

PROBLEM TO BE SOLVED: To prevent an adhesive for joining a drive element substrate to a protective substrate from flowing in the driving portion of the drive element substrate in a droplet discharge head.SOLUTION: In a droplet discharge head, a drive element substrate 112 and a protective substrate 113 are joined via an adhesive 125. The drive element substrate 112 has the joint portion 126 of a drive element substrate side at which the joint portion 113a of a protective substrate side of the protective substrate 113 is joined to the surface facing the protective substrate 113. The joint portion 126 has an adhesive application area 126a scheduled for application of the adhesive 125 and a non-application area 126b unscheduled for application of the adhesive 125. Besides, the joint portion 126 has the variation point of surface property on the boundary between the adhesive application area 126a and the non-application area 126b. 【課題】液滴吐出ヘッドにおいて、駆動素子基板と保護基板を接合するための接着剤が駆動素子基板の駆動部分に流れ込むことを防止する。【解決手段】駆動素子基板１１２と保護基板１１３は接着剤１２５を介して接合されている。駆動素子基板１１２は、保護基板１１３と対向する面に保護基板１１３の保護基板側接合部分１１３ａが接合される駆動素子基板側接合部分１２６を備えている。駆動素子基板側接合部分１２６は、接着剤１２５の塗布が予定される接着剤塗布領域１２６ａと接着剤１２５の塗布が予定されない未塗布領域１２６ｂを備えている。駆動素子基板側接合部分１２６は、接着剤１２５の拡がりを制御するために接着剤塗布領域１２６ａと未塗布領域１２６ｂの境界に表面性の変化点を備えている。【選択図】図８