 Methods of forming magnetoresisitive devices |
| In one aspect, the invention encompasses a method of forming a magnetoresistive device. A stack is ... |
|
| Electronic package of photo-sensing semiconductor devices, and the fabrication and assembly thereof |
| Briefly described, and in accordance with a preferred embodiment thereof, the present invention ... |
|
| Electrically programmable resistance cross point memory |
| Accordingly, a memory structure is provided, which comprises a substrate, a plurality of bottom ... |
|
| Semiconductor photodiode |
| What is claimed is: 1. A semiconductor photodiode, comprising: a substrate formed of one of an n-... |
|
| Multiple color detection elevated pin photo diode active pixel sensor |
| The present invention is a color detection active pixel sensor which provides efficient absorption ... |
|
| Luminance-priority electronic color image sensor |
| What is claimed is: 1. A luminance priority color sensor comprising: a semiconductor substrate ... |
|
| Process for integration of a high dielectric constant gate insulator layer in a CMOS device |
| It is an object of this invention to fabricate a complimentary metal oxide semiconductor (CMOS) ... |
|
| Semiconductor device and a method of manufacturing the same |
| The present invention is made to solve such disadvantages as described above and contemplates a ... |
|
|
Solid state ink jet print head and method of manufacture
| Details |
Inventors: Weber, Timothy L.; Trueba, Kenneth E.; Harmon, John Paul;
Assignee: Hewlett-Packard Company (Palo Alto, CA)
Primary Examiner: Gulakowski; Randy
Assistant Examiner: Ahmed; Shamim
Attorney, Agent or Firm:
An ink jet print head having a substrate with an upper surface, and an ink supply conduit passing through the substrate. An array of independently addressable ink energizing elements are attached to the upper surface of the substrate. An orifice layer has a lower surface conformally connected to the upper surface of the substrate, and has an exterior surface facing away from the substrate. The orifice layer defines a plurality of firing chambers providing communication to the ink energizing elements, and each of the orifices is positioned in registration with a respective single ink energizing element. The exterior surface defines a plurality of nozzle apertures, each providing the upper terminus of a single firing chamber. Each of the firing chambers is laterally separated from all other firing chambers by a septum portion of the orifice layer. |
|
DETAILED DESCRIPTION Ink jet printing mechanisms use pens that shoot droplets of colorant onto a printable surface to generate an image.
Such mechanisms may be used in a wide variety of applications, including computer printers, plotters, copiers, and facsimile machines.
For convenience, the concepts of the invention are discussed in the context of a printer.
An ink jet printer typically includes a print head having a multitude of independently addressable firing units.
Each firing unit includes an ink chamber connected to a common ink source, and to an ink outlet nozzle.
A transducer within the chamber provides the impetus for expelling ink droplets through the nozzles.
To obtain high resolution printed output, it is desirable to maximize the density of the firing units, requiring miniaturization of print head components.
When resolutions are sufficiently high, conventional manufacturing by assembling separately produced components becomes prohibitive.
The substrate that supports firing resistors, the barrier that serves as a gasket to isolate individual resistors, and the orifice plate that provides a nozzle above each resistor are all subject to small dimensional variations that can accumulate to limit miniaturization.
In addition, the assembly of such components for conventional print heads requires precision that limits manufacturing efficiency.
Monolithic print heads have been developed to provide a print head manufacturing process that uses photo imaging techniques similar to those used in semiconductor manufacturing.
The components are constructed on a flat wafer by selectively adding and subtracting layers of various materials.
Using photo-imaging techniques, dimensional variations are limited.
Variations do not accumulate because each layer is registered to an original reference on the wafer.
Existing monolithic print heads are manufactured by printing a mandrel layer of sacrificial material where firing chambers and ink conduits are desired, covering the mandrel with a shell material, then etching or dissolving the mandrel to provide a chamber defined by the shell
|
| Related patents |
|
|
Wafer level contact sheet and method of assembly
The present invention relates to a system and method for performing reliability screening on semi-conductor wafers that uses a highly planar burn-in apparatus. The burn-...
|
|
|
Packaging micromechanical devices
Referring to FIG. 1, a 3.times.3 micromechanical mirror array is shown by way of example of a MEMS device array that is advantageously packaged according to the ...
|
|
|
Gate stack for high performance sub-micron CMOS devices
A principle objective of the invention is to provide a gate electrode structure having sub-micron device feature lengths. Another objective of the invention is to ...
|
|
|
Sensitivity control for nanotube sensors
In accordance with one aspect of the present invention an electronic system for detecting analytes is provided. The system includes a signal control and processing unit ...
|
|
|
Method of etching crystalline material with etchant injection inlet
The present invention has been accomplished in view of the various points as described above, and its object is to provide a fine working method of a crystalline ...
|
|
|
Selective formation of porous silicon
OF THE INVENTION The invention is based on forming a latent pattern in the surface of a silicon substrate that on exposure to etchant forms a pattern of porous silicon. ...
|
|
|
Method of producing buried porous silicon-geramanium layers in monocrystalline silicon lattices
The ability to synthesize Si based materials with new optical, photonic and electronic properties is greatly desired. Unfortunately, despite considerable effort, Si ...
|
|
|
Methodology for measuring and controlling film thickness profiles
The invention improves the control of film thicknesses within semiconductor manufacturing processes by evaluating an entire profile of a film layer (as opposed to an ...
|
|
|
Keepers for MRAM electrodes
A magnetic memory array, preferably comprising an MRAM, with a series of top electrodes in contact with a magnetic keeper on at least one surface, a series of bottom ...
|
|
|
All metal giant magnetoresistive memory
According to the present invention, a memory technology is provided which is based on structures which exhibit the property of giant magnetoresistance (GMR), and which ...
|
|
|
MEMS 
