Patent ID: 8313176

Claim:
A liquid ejection head comprising a plurality of plates which are laminated via an adhesive, at least one of the plurality of plates comprising: a plurality of holes which are configured to function as liquid channels; a plurality of individual bonding margins which are formed on a surface of the plate, and individually surround the plurality of holes; a bonding margin bridge which extends parallel to a direction connecting the plurality of holes to each other, and connect the plurality of individual bonding margins to each other; and a groove which defines outer edges of the plurality of individual bonding margins and the bonding margin bridge on the surface of the plate, wherein the bonding margin bridge further comprise a first bonding margin bridge, and wherein an area Sa of one of the plurality of individual bonding margins and an area Sb of the first bonding margin bridge satisfy Sb≦Sa and 0.2≦Sb/Sa≦1.0 is satisfied.