This patent describes an ink jet printer where ink is ejected from a nozzle chamber by means of the utilisation of the electrostatic attraction between two parallel plates. An electrostatic actuator includes a first planar electrode formed within a bottom and a moveable second planar electrode arranged above the first planar electrode. The second planar electrode is moveable to a pre-firing position adjacent to the first planar electrode, thereby causing a corrugated border portion of the second electrode to concertina. Upon reduction of a potential difference, the corrugated border returns to its quiescent position, thereby causing the ejection of ink from the nozzle chamber. Between the first planar electrode and the second planar electrode is an air gap interconnected to an external atmosphere at a side of the nozzle chamber such that air flows into and out of the gap upon movement of the actuator.
A camera includes a housing. An image sensor is fixed with respect to the housing and is configured to capture images. A print roll unit is releasably mounted within the housing. The print roll unit includes an elongate core, in turn, including a plurality of ink supply containers. Each container contains a respective type of ink. A roll of print media includes a tubular former in which the core can be received and a length of print media which is wound upon the former. A casing includes a pair of molded covers which can be releasably fastened together to encase the roll of print media, and defines a print media exit slot. A printer is housed in the housing, in fluid communication with the core, and is configured to print the captured images on the print media with ink stored in the core.
The described embodiments relate to fluid-ejection devices and methods of forming same. One exemplary embodiment includes a plurality of fluid drop generators and associated electrically conductive paths, and at least one electron beam generation assembly configured to selectively direct at least one electron beam at individual electrically conductive paths sufficiently to cause fluid to be ejected from an associated fluid drop generator.
Ink jet printheads and printhead components are described. One printhead includes a flow path and a piezoelectric actuator. The flow path includes a pumping region and the piezoelectric actuator is associated with the pumping region. The actuator has a pre-fired piezoelectric layer with a thickness of about 50 microns or less. A bonding layer fixes the pre-fired piezoelectric layer relative to the flow path.
A printhead having a monolithic semiconductor body with an upper face and a lower face. The body defines a fluid path including a pumping chamber, a nozzle flow path, and a nozzle opening. The nozzle opening is defined in the lower face of the body and the nozzle flow path includes an accelerator region. A piezoelectric actuator is associated with the pumping chamber. The actuator includes a piezoelectric layer having a thickness of about 50 micron or less.
