Inkjet drop ejection apparatus with radially extending thermal actuators

摘要

An inkjet drop ejection apparatus comprises an array of ink ejection nozzles; a chamber corresponding to each ink ejection nozzle and for storing ink; and a plurality of actuators provided on top of each chamber, the actuators radially extending out from a common center and defining an ink ejection port at the common center. Each actuator is comprised of first material of surrounding a conductive core of a second material. Each actuator is adapted to bend inward with respect to the chamber when heated.