Hewlett-packard Development Company, L.P.

Hewlett-packard Company

George H Corrigan

Scott A Linn

Daryl E Anderson

Michael J Barbour

Michael W Cumbie

John M Wade

Chantelle Domingue

Ning Ge

James Michael Gardner

Trudy L Benjamin

Joseph M Torgerson

Jeffery S Beck

Richard I Klaus

Neel Banerjee

Teck-Khim Neo

Dennis J Schloeman

Matthew David Smith

Glenn Thomas Haddick

Winthrop D Childers

Alexander N Govyadinov

Adam L Ghozeil

Mark S Hickman

Manish Giri

Clayton L Holstun

Andrew Koll

Jeremy Sells

Graham Ross

Sadiq Bengali

Satya Prakash

King-Wah W Yeung

Teck Khim Neo

Tim R Koch

Joshua M Yu

Jaime H Bohorquez

Masoud K Zavarehi

Hilary Ely

Adam Higgins

Stanley J Wang

John P Whitlock

Pere Esterri

Tod Woodford

Darryl E Anderson

Chantelle E Domingue

Judy Benjamin

A print component integrated circuitry package includes a number of temperature sensors where each of the plurality of the temperature sensors is disposed in a corresponding temperature region of an integrated circuitry. In an example, an analog sense bus conductively connects to all of the plurality of temperature sensors and an external sensor pad that is to connect to a corresponding print controller contact.

Temperature detection and control

In one example in accordance with the present disclosure, a microfluidic device is described. The microfluidic device includes a reservoir to contain a first thermally expandable fluid, a first heater to heat the thermally expandable fluid in the reservoir, a channel extending from the reservoir and connected to the reservoir at a first opening, and a liquid volume obstructing the channel.

Microfluidic devices

A method may include maintaining a sample comprising an ionic species and an optical indicator at an elevated temperature above 25&#xb0; C. on a semi-conductive microfluidic die during an incubation period, intermittently interrogating the sample with an interrogating light during the incubation period and sensing a response of the sample to the interrogating light, wherein the sample is interrogated with the interrogating light only during those times at which the sample is being sensed.

Ionic species interrogation and sensing

The viscosity of a fluid may be determined using a flow rate determination. The flow rate may be determined based on fluid presence determinations within a capillary channel. Also, a temperature of an environment surrounding a capillary channel may be determined and signals may be transmitted to a thermal element responsive to the determined temperature.

Determine viscosity of fluids using a capillary channel

An integrated circuit to drive a plurality of fluid actuation devices includes a contact pad and a programmable pulldown device. The programmable pulldown device is electrically coupled to the contact pad. The programmable pulldown device is settable to any one of a plurality of resistances.

Pulldown devices

According to an example, a microfluidic apparatus may include a fluid slot and a foyer that is in fluid communication with the fluid slot via a channel having a relatively smaller width than the foyer. The microfluidic apparatus may also include an electrical sensor to measure a change in an electrical field caused by a particle of interest in a fluid passing through the channel from the fluid slot to the foyer, an actuator to apply pressure onto fluid contained in the foyer, and a controller to receive the measured change in the electrical field from the electrical sensor, determine, from the received change in the electrical field, an electrical signature of the particle of interest, and control the actuator to control movement of the particle of interest based upon the determined electrical signature of the particle of interest.

Microfluidic apparatuses for fluid movement control

The present disclosure is drawn to an insulated sensor including a silicon substrate with active circuitry on a surface thereof, an electrode disposed on the silicon substrate, a passivation layer having a thickness from greater than 500 Angstroms to 3,000 Angstroms disposed on the active circuitry, and an electrode insulating layer having a thickness from 10 Angstroms to 500 Angstroms disposed on the electrode.

Insulated sensors

A fluidic die may include a number of actuators. The number of actuators form a number of primitives. The fluidic die may include a digital-to-analog converter (DAC) to drive a number of the delay circuits. The delay circuits delay a number of activation pulses that activate the actuators associated with the primitives to reduce peak power demands of the fluidic die. A number of delay circuits may be coupled to each primitive.

Fluidic die

One example provides a printhead including a plurality of printhead dies, each printhead die including at least one crack sense resistor. At least one analog bus is connected to each printhead die, the at least one analog bus to output voltages to facilitate a printer controller to determine whether at least one of the printhead dies is cracked.

Crack sensing for printhead having multiple printhead die

In some examples, a method of sensing an ink level includes applying a pre-charge voltage to a sense capacitor to charge the sense capacitor with a charge, sharing the charge between the sense capacitor and a reference capacitor, causing a reference voltage at a gate of an evaluation transistor, and determining a resistance from a drain to a source of the evaluation transistor that results from the reference voltage.

Ink level sensing

A fluidic die includes a number of sensors to measure properties of a number of property control elements associated with the printhead die, a pass gate to communicate a number of signals to an application specific integrated circuit (ASIC) via an analog bus using control logic associated with the pass gate, and a bi-directional configuration bus coupled to the fluidic die to transmit a number of control signals to property control elements located on the fluidic die.

An inkjet printhead including a plurality of printhead dies, each printhead die including at least one crack sense resistor, at least one analog bus connected to each printhead die, and a controller separate from the plurality of printhead dies. The controller is configured to provide a known current to the at least one crack sense resistor of each printhead die in a selectable pattern via the at least one analog bus and to determine whether the printhead dies are cracked based on resulting voltages produced on the at least one analog bus.

In some examples, an ink level sensor includes a sense capacitor between a first node and ground, a first switch to couple a first voltage to the first node and charge the sense capacitor, a second switch to couple the first node with a second node and share the charge between the sense capacitor and a reference capacitor, causing a second voltage at the second node, and a transistor having a drain, a gate coupled to the second node, and a source coupled to ground, the transistor to provide a drain to source resistance in proportion to the second voltage.

A wide array printhead module includes a plurality of printhead die. Each of the printhead die includes a number of sensors to measure properties of a number of elements associated with the printhead die. The wide array printhead module further includes an application specific integrated circuit (ASIC) to command and control each of the printhead die. The ASIC is located off any of the printhead die.

Wide array printhead module

Growing community of inventors

Corvallis, OR, United States of America

George H Corrigan