Patent ID: 7354138

Claim:
A liquid droplet discharge head, comprising: a channel which is formed by joining together a plurality of thin plates which are laminated with an adhesive; and an adhesive escape groove which is provided on at least one joined surface of the thin plates in at least one location on a periphery of the channel when a ratio M S â€² determined in relation to the channel is greater than a predetermined value, wherein: the ratio M S â€² is a ratio between an area M and an area Sâ€²; the area M is an area of the adhesive running off to the channel at joining assuming that no adhesive escape groove is provided on the periphery of the channel, the area M being a projected area on a cross-section perpendicular to a flow direction of the channel; and the area Sâ€² is an area of a cross-section perpendicular to the flow direction of the channel at post-joining assuming that no adhesive runs off to the channel.