Abstract:
PROBLEM TO BE SOLVED: To provide a method and a device for enhancing the uniformity of droplets among a plurality of jets.SOLUTION: During a print cycle 20, 21, heat pulses 22, 24, 26, 28 of different profiles are delivered to inkjets of a print head. Selected ones of the inkjets are enabled 40 in coordination with the occurrence of selected ones of the heat pulses 22, 24, 26, 28 to control a characteristic of drops that are jetted by the respective inkjets.
Abstract:
PROBLEM TO BE SOLVED: To form a piezoelectric element having a stiffened surface.SOLUTION: An inkjet printing module is configured such that a curved region of a piezoelectric element, adjacent to an ink chamber, spans the ink chamber along a first direction and a second direction, the curved region having: a radius of curvature that varies along the first direction; and a radius of curvature that varies along the second direction, wherein the first and second directions are orthogonal.
Abstract:
PROBLEM TO BE SOLVED: To provide a microelectromechanical system.SOLUTION: The microelectromechanical system with structures having piezoelectric actuators (104) is provided. A plurality of piezoelectric islands are supported by a body (200) having a plurality of channels (205). The piezoelectric islands can be formed, in a part of the steps, by forming cuts (145) into a thick layer of a piezoelectric material, temporarily bonding it to a handle substrate, attaching the cut piezoelectric layer (107) to the body (200) having etching formation structures, and grinding the piezoelectric layer to a thickness that is smaller than depths of the cuts (140). Conductive materials (158, 210) can be formed on the piezoelectric layer to form electrodes (106, 112).
Abstract:
PROBLEM TO BE SOLVED: To provide a technique including a method and device for forming nozzles in a microelectromechanical device such as an ink jet print head. SOLUTION: The nozzles 460 are formed in a layer 420 prior to the layer 420 being bonded onto another portion 440 of the device. Forming the nozzles 460 in the layer 420 prior to bonding enables forming nozzles 460 that have a desired depth and a desired geometry. Selecting a particular geometry for the nozzles 460 can reduce the resistance to ink flow as well as improve the uniformity of the nozzles 460 across the microelectromechanical device. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a suitable printing head having a monolithic semiconductor body defining a pressure chamber, a nozzle flow channel and a nozzle opening part. SOLUTION: This printing head includes the monolithic semiconductor body 26 defining the pressure chamber 33, the nozzle flow channel 66 and the nozzle opening 22. The pressure chamber 33 is correlated with a piezoelectric actuator 28 including a piezoelectric layer 76 having about 50 microns or less of thickness. The semiconductor body also defines filter/impedance constitution 32 having plurality of flow channel openings. The semiconductor body is preferably a polished SOI wafer. In another embodiment, the printing head has a piezoelectric layer having about 0.05 microns or less of surface Ra, or including a porous filler in at least one surface. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a proper printhead.SOLUTION: A printhead has a monolithic semiconductor body (26) which defines a pressure chamber (33), a nozzle flow path (66) and a nozzle opening (22). A piezoelectric actuator (28) is associated with the pressure chamber, the actuator including a piezoelectric layer 76 having a thickness of about 50 microns or less. A semiconductor body also defines a filter/impedance feature (32) having a plurality of flow openings. The semiconductor body is preferably a polished SOI wafer. In another aspect, the invention features the printhead with a piezoelectric layer having a surface Ra of about 0.05 microns or less, or at least one surface including a void-filler material.
Abstract:
PROBLEM TO BE SOLVED: To provide a driving method in a drop-on-demand droplet ejection device where performance of the device is not influenced by frequency response of an ejector when the device is operated over a wide range of the frequency. SOLUTION: The driving method drives the droplet ejection device 12 and causes the device to eject a single droplet in response to tow or more pulses by using a multipulse waveform including two or more pulses each having an about 25 or less pulse cycle. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for decreasing a drop in ink speed between heat cycles of a piezoelectric inkjet printing module, and a method for polarizing the piezoelectric inkjet printing module.SOLUTION: A piezoelectric element 34 is superposed on a film 30. The piezoelectric element 34 has an electrode 40 on the piezoelectric element 34 side contacting the film 30. The electrode 40 comes in contact with an electrical contact 31 on the side 51 of the film 30 so that the electrode can be individually dealt with by a drive and integration circuits. The electrode 40 is placed on a semiconductor film 36 on the surface of the piezoelectric element 34.
Abstract:
PROBLEM TO BE SOLVED: To provide methods and articles used to degas liquids in a drop ejection device.SOLUTION: The drop ejection device includes: a channel wherein a fluid therein is pressurized for discharging a droplet from a nozzle opening and at least a part thereof is demarcated by a silicon material; and a deaerator 45 including a partition 50 having at least a hole 60 between a fluid reservoir region 47 and a vacuum region 49, and the deaerator containing the silicon material.