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Abstract

A droplet deposition apparatus, such as an inkjet printhead, that includes an integrally-formed manifold component and one or more actuator components; these actuator components provide an first array of fluid chambers, each of which has a piezoelectric actuator element and a nozzle, with this piezoelectric actuator element being able to cause the release in a deposition direction of fluid droplets through the nozzle in response to electrical signals; the first array of fluid chambers extends in an array direction from a first longitudinal end to a second, opposite longitudinal end, this array direction being perpendicular to the deposition direction; in addition, the manifold component is elongate in the array direction and includes a first and second manifold chambers, with these manifold chambers extending side-by-side in the array direction and the first manifold chamber being fluidically connected to the second manifold chamber via each of the fluid chambers in the first array; the cross-sectional area of at least one of these manifold chambers is tapered with distance in the array direction, for example to improve purging of the chambers during start-up; the cross-sectional shape of the integrally-formed manifold component perpendicular to the array direction varies with distance in the array direction such that the centroid of the cross-section remains a substantially constant distance, in said deposition direction, from said array of fluid chambers over the length of the first array of fluid chambers, with the integrally-formed manifold component thus being essentially self-stiffening.

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First Claim