公开(公告)号：US20210331252A1

公开(公告)日：2021-10-28

申请号：US16606084

申请日：2018-07-31

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Seongsik Chang ,  Krzysztof Nauka ,  Alejandro Manuel De Pena ,  Lihua Zhao

IPC: B22F12/43 ,  B22F10/28 ,  B22F10/36 ,  B28B1/00 ,  B28B17/00 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y50/02 ,  B23K26/06

Abstract: According to examples, an apparatus may include an array of micro-mirrors, each of the micro-mirrors being individually controllable to selectively be in a first position or a second position, and a light source to direct a pulse of light onto the array of micro-mirrors with sufficient intensity to cause micron-sized particles on a powder bed upon which the light is directed from the array of micro-mirrors to at least partially melt. Each of the micro-mirrors that is in the first position may reflect light onto a respective area on a layer of micron-sized particles to at least partially melt the micron-sized particles in the respective area and each of the micro-mirrors that is in the second position may reflect light away from the powder bed on which the micron-sized particles are supported.

公开(公告)号：US10459372B2

公开(公告)日：2019-10-29

申请号：US16076342

申请日：2017-01-13

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. ,  Seongsik Chang

Inventor： Seongsik Chang

IPC: G03G15/10 ,  G03G15/11 ,  C09D11/02 ,  G03G9/00

Abstract: A binary ink developer (BID) assembly for a liquid electrophotography (LEP) printing device can include a developer roller having an electrically insulating exterior coating that receives ink from an ink supply and transfers the received ink to a photoconductive imaging cylinder in accordance with an electrostatic image on the imaging cylinder. A charge-specified boundary condition can exist at the boundary between the exterior coating and the ink. Electrically conductive ink may not be transferred to the imaging cylinder at background portions of the electrostatic image.

公开(公告)号：US11845127B2

公开(公告)日：2023-12-19

申请号：US17043112

申请日：2018-06-08

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Thomas Anthony ,  Seongsik Chang ,  Keith Edward Moore

IPC: B22F10/00 ,  B33Y30/00 ,  B22F12/50 ,  B22F12/63 ,  B22F10/20 ,  B22F10/10 ,  B22F10/37 ,  B33Y70/00

CPC classification number: B22F10/00 ,  B22F10/20 ,  B22F12/50 ,  B22F12/63 ,  B33Y30/00 ,  B33Y70/00 ,  B22F10/10 ,  B22F10/37 ,  B22F2202/06 ,  B22F2999/00 ,  B22F12/50 ,  B22F12/63 ,  B22F2202/06

Abstract: A system to apply uniform layers of metal powder, the system includes: a conductive roller with a dielectric coating, the conductive roller biased at a first voltage; a powder supply to contain a metal powder biased at a second voltage, the powder supply to provide the metal powder to the conductive roller to form a uniform layer of metal powder on the dielectric coating of the conductive roller; a deposition area to receive the uniform layer of metal powder from the conductive roller, the deposition area biased at a third voltage, wherein the metal powder is transferred across an air gap from the conductive roller to the deposition area by electrostatic attraction of the metal powder.

公开(公告)号：US11338367B2

公开(公告)日：2022-05-24

申请号：US16606260

申请日：2018-06-08

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Thomas Anthony ,  Seongsik Chang

IPC: B33Y10/00 ,  B33Y30/00 ,  B33Y40/00 ,  B22F12/00 ,  B22F10/50

Abstract: A system for compacting layers of metal powder, including: a layer of metal powder at a first voltage; and a conductive object above the layer of metal powder, the conductive object at a second voltage, wherein a voltage differential between the layer of metal powder and the conductive object is sufficient to attract particles from the layer of metal powder to the conductive object, change the voltage on the particles, and redeposit the particles in the layer of metal powder.

公开(公告)号：US11143978B2

公开(公告)日：2021-10-12

申请号：US17256340

申请日：2018-10-11

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Seongsik Chang ,  Omer Gila ,  Daniel Espinosa ,  Anthony W. McLennan ,  Eyal Lovton ,  Asael Degany

IPC: G03G15/02 ,  G03G15/00

Abstract: A device includes a charge roller and a control portion. The charge roller is removably insertable to be in charge-transferring relation to, and spaced apart by a first air gap from, a photoconductive imaging portion of an electrophotographic printer. The control portion is to determine a size of the first air gap based on determination of a charging threshold voltage associated with the charge roller.

公开(公告)号：US20210302860A1

公开(公告)日：2021-09-30

申请号：US17254919

申请日：2018-12-20

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Seongsik Chang ,  Brad Thomas Dransfield ,  Eric G. Nelson ,  Bruce J. Jackson ,  Omer Gila ,  Anthony William McLennan ,  Asaf An ufa ,  Daniel Espinosa

IPC: G03G15/02

Abstract: An electrophotographic printer includes a charge roller in charge-transferring relation to a photoconductive imaging portion. The printer may determine an AC voltage setpoint of the charge roller.

公开(公告)号：US20210252602A1

公开(公告)日：2021-08-19

申请号：US17056211

申请日：2018-10-23

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Seongsik Chang

IPC: B22F12/44 ,  G02B26/08 ,  G02B7/18 ,  B81B7/00 ,  B33Y30/00

Abstract: Mounts for micro-mirrors are disclosed. A disclosed example apparatus includes a micro-mirror having a reflective surface area, and a movable mount to support and move the micro-mirror to direct light onto a printing area, where the movable mount includes a cross-sectional profile area that is at least 30% of the reflective surface area of the micro-mirror.

公开(公告)号：US10901344B2

公开(公告)日：2021-01-26

申请号：US16598120

申请日：2019-10-10

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Seongsik Chang

IPC: G03G15/10 ,  G03G15/11 ,  C09D11/02 ,  G03G9/00

Abstract: A binary ink developer (BID) assembly for a liquid electrophotography (LEP) printing device can include a developer roller having an electrically insulating exterior coating that receives ink from an ink supply and transfers the received ink to a photoconductive imaging cylinder in accordance with an electrostatic image on the imaging cylinder. A charge-specified boundary condition can exist at the boundary between the exterior coating and the ink. Electrically conductive ink may not be transferred to the imaging cylinder at background portions of the electrostatic image.

公开(公告)号：US09952527B2

公开(公告)日：2018-04-24

申请号：US15590874

申请日：2017-05-09

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Omer Gila ,  Seongsik Chang ,  Michael H. Lee

IPC: G03G15/02

CPC classification number: G03G15/0258 ,  G03G15/02 ,  G03G15/0216 ,  G03G15/0266 ,  G03G15/043 ,  G03G15/10 ,  G03G15/11

Abstract: Techniques for liquid electrography printing are described herein. In at least some examples herein, a liquid electrographic printer includes a charging element for charging a photo imaging plate (PIP). A light source irradiates light onto the charge element. The irradiated light is to heat the charge element to a selected temperature.

公开(公告)号：US20170219949A1

公开(公告)日：2017-08-03

申请号：US15500911

申请日：2014-07-31

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Thomas Anthony ,  Seongsik Chang ,  Omer Gila

IPC: G03G15/02 ,  G03G15/08 ,  B41F31/26

CPC classification number: G03G15/0233 ,  B41F31/26 ,  G03G15/0216 ,  G03G15/0258 ,  G03G15/0808 ,  G03G15/0817 ,  G03G15/0818

Abstract: An inner resistive film is applied to a conductive substrate. Ductile particles are disposed substantially uniformly throughout the inner resistive film. An outer resistive film is applied to the inner resistive film.