A multicolor display device includes a transparent substrate (22), red and green fluorescent dyes (21) ink jet printed onto the substrate, a conductive layer (23) deposited over the red and green dye, an organic blue light emitting layer (24) deposited over the conductive layer, and an electrical contact deposited onto the blue light emitting layer.

Multicolor display devices

The novel pen body construction described herein includes multiple ink storage compartments communicating with a multi-orifice printhead, and these compartments are adapted to receive sections of ink-storage foam. Preferably, this foam is a reticulated polyurethane foam of controlled porosity and capalarity and is especially well suited for storing different ink colors, such as cyan, magenta and yellow. However, single compartment black ink storage is also within the scope of this invention.

Thermal ink jet pen body construction having improved ink storage and feed capability

A liquid ink, drop-on-demand printhead includes a substrate having a plurality of drop-emitter orifices, an ink channel coupled to each of the orifices for delivery of a body of ink to the orifices at a pressure above ambient, thereby forming an ink meniscus at the orifices. Drop selection is effected by selectively delivering heat to ink which has been delivered to selectively addressed ones of the orifices, thereby causing a difference in meniscus position between ink in addressed and non-addressed orifices. A heater is suspended in each ink meniscus close to its surface when the meniscus is at its position in a non-addressed orifice, the heater being effective to heat the meniscus and to thereby reduce surface tension of the meniscus at selectively addressed orifices.

Ink printing apparatus with improved heater

An ink jet print device includes a passageway for flowing ink having an outlet for ejecting ink at one end. The passageway has a portion where the cross-sectional dimensions of the passageway change. A generating device which generates energy for ejecting ink from the outlet is disposed on a surface intersecting the passageway and defines a part of the portion where the cross-sectional dimensions of the passageway change.

Ink jet print device and print head or print apparatus using the same

A directional brain stimulation lead assembly provides a lead (18) body and an insulating member (10) defining one or more windows (16) that selectively expose portions of electrodes (24A, 24B, 24C, 24D) carried by the lead body to produce a directional stimulation current field. The lead assembly can achieve more effective localization of electrical stimulation to very small brain targets, and thereby reduce the incidence of material side effects caused by collateral stimulation of brain tissue adjoining a desired brain target. In addition, the directional lead can sense brain activity on a more localized basis.

Directional brain stimulation and recording leads

A thermal ink jet printer is disclosed in which ink droplets are ejected from an orifice by the explosive formation of a vapor bubble within the ink supply due to the application of a two part electrical pulse to a resistor within the ink supply. The electrical pulse comprises a precurser pulse and a nucleation pulse; the precurser pulse preheats the ink in the vicinity of the resistor to a temperature below the boiling temperature of the ink so as to preheat the ink while avoiding vapor bubble nucleation within the ink supply and the subsequently occuring nucleation pulse very quickly heats the resistor to near the superheat limit of the ink.

Thermal ink jet printer

A thermal ink jet head is disclosed in which the jetting resistors, fluid interconnections, ink reservoir, electrical connections, and jetting orifices are fully integrated to provide an inexpensive, disposable jetting head. The entire hydraulic ink system is sealed to eliminate user interaction with the liquid ink, and ink can only exit the head via the jetting orifices under the influence of the jetting resistors. Once the ink is expended the user disposes with the old head and installs a new one by breaking and making a simple mechanical and low voltage electrical connection.

Disposable ink jet head

An ink reservoir which incorporates a negative back pressure source coupled to a membrane wall of the reservoir to prevent ink leakage from a reservoir orifice is disclosed. The back pressure is created by either a linear or nonlinear spring which can be either independent of, or integral with, the membrane. The result is freedom from ink leakage and improved quality printing when the reservoir is used in conjunction with an ink pen such as used in ink jet printing.

Ink reservoir with essentially constant negative back pressure

A method of making a monolithic bubble-driven ink jet print head is provided which eliminates the need for using glue or other adhesives to construct multiple part assemblies. The concept of the method is to provide a layered structure which can be manufactured by relatively standard integrated circuit and printed circuit processing techniques. First, a substrate/resistor combination is manufactured. Then a foundation of conductive material is firmly attached to the substrate and a resist layer is used to define a perimeter/wall combination over the foundation, with the perimeter/wall combination surrounding the resistors and providing hydraulic separation between them. The perimeter/wall combination is then electroplated in place. A flash coat of metal is applied over the resist which is inside the perimeter of the perimeter/wall combination and a second layer of resist is used to define the desired orifices and the external shape of the part. A second layer of metal is then electroplated in place on the flash coat covering the first layer of resist and the perimeter/wall combination. The flash coat and resists are then stripped, leaving a void defined by the second layer of metal and the perimeter/wall combination, with this second layer of metal having an orifice therein. The void forms the firing chamber for supplying ink to the resistors during operation.

Monolithic ink jet print head

A fabrication method for applying electrically conductive circuit traces to a substrate is described. The method uses an ink composition which is applied to a selected substrate by an ink delivery system. The ink includes an adhesive in combination with other additives, including one or more sovlents. The ink is delivered by the ink jet system in a selected pattern, followed by the application of a powdered metal to the pattern which adheres to the adhesive in the ink. After the removal of excess powder, the substrate, pattern and powder are heated in an amount sufficient to melt the powder on the substrate. This produces a pattern of conductive traces geometrically corresponding to the ink pattern initially applied to the substrate.

Frank L. Cloutier

Papers

Thermal ink jet printer

Disposable ink jet head

Ink reservoir with essentially constant negative back pressure

Monolithic ink jet print head

Method for applying a conductive trace pattern to a substrate