Hewlett-packard Development Company, L.P.

Other

Gregory N Burton

Steven B Elgee

Joseph M Torgerson

Kevin Bruce

Jody L Clayburn

Trudy L Benjamin

Mark H MacKenzie

Kenneth R Williams

Paul I Mikulan

Kurt F Olsen

Ernesto A Garay

Lorraine T Golob

David Miller Lowe

Chen-Hsi Lin

Chi-Kwan Lau

Lorraine Theresa Widmann

Jacob McDonald Smith

Mark H Mackenzie

A drop detector includes a printed circuit board (PCB) including a number of optical channels each formed by a light emitter and a light detector and a number of holes defined in the PCB over which the optical channels pass over and through which a number of ejected drops from a number of printheads pass through wherein each of the number of holes defined in PCB are sized to contour the shape of the number of the printheads.

Drop detector

A method of detecting droplets of printing fluid output from a nozzle array includes, in an example, grouping a number of nozzles into a number of individual groups of nozzles and sequentially detecting, with a printing fluid detector, printing fluid ejected from each group of nozzles using a linear position encoder to synchronize the position of the printing fluid detector wherein the printing fluid detector stops moving while detecting each group of nozzles.

Detecting droplets

A printhead assembly for an inkjet-printing device includes a printhead die and a flexible circuit connected to the printhead die. The printhead die includes a substrate, a first ground network electrically connected to the substrate, a device layer, and a second ground network electrically connected to the device layer. The first ground network and the second ground network are electrically isolated from one another within the printhead die. The first ground network and the second ground network are electrically connected to one another at the flexible circuit.

Electrically connecting electrically isolated printhead die ground networks at flexible circuit

A system for drop detection of fluid drops ejected by a printing device includes a drop detector comprising a radiation source and radiation sensor for illuminating a region in which drops are ejected by a print bar and detecting radiation from the radiation source that is reflected by backscattering from the drops to the radiation sensor; and a controller for controlling the drop detector and the print bar, wherein the controller uses a signal output by the drop detector to determine whether nozzles of the print bar are operating properly.

Drop detection

Embodiments of a printhead are disclosed.

Printheads

Edges of a first conductive layer () and a silicate glass layer () extend adjacent one another along a via () extending to a semiconductor substrate (). An electrical conductor () extends through the via () into contact with the semiconductor substrate ().

Fluid ejection device comprising substrate contact via

The present invention provides a buried layer fabrication sequence suitable for bipolar and BiCMOS applications. The buried layer fabrication sequence for forming a buried layer having a first conductivity type includes the steps of: forming a first dielectric layer on a semiconductor substrate, the semiconductor substrate having a second conductivity type; forming a first mask layer having openings on top of the first dielectric layer, wherein the openings in the first mask layer are positioned over the regions where the first buried layer is formed; exposing the semiconductor substrate in the regions where openings in the first mask layer are formed; forming a second dielectric layer; removing the second dielectric layer; and forming a semiconductor layer.

Growing community of inventors

Camas, WA, United States of America

Gregory N Burton