公开(公告)号：US11785856B2

公开(公告)日：2023-10-10

申请号：US16481023

申请日：2018-01-26

Applicant: THE TRUSTEES OF DARTMOUTH COLLEGE

Inventor： Zi Chen ,  John X. J. Zhang ,  Lin Dong ,  Zhe Xu

IPC: H10N30/30 ,  A61N1/378 ,  H02N2/18 ,  H10N30/857

CPC classification number: H10N30/306 ,  A61N1/3785 ,  H02N2/186 ,  H10N30/857

Abstract: A piezoelectric energy harvester has a layered structure comprising a first electrode, a polymeric piezoelectric material, and a second electrode, the layered structure coupled to receive mechanical stress from the environment, and the first and second electrode electrically coupled to a power converter. The power converter is adapted to charge an energy storage device selected from a capacitor and a battery. The method of harvesting energy from the environment includes providing a piezoelectric device comprising a layer of a polymeric piezoelectric material disposed between a first and a second electrode; coupling mechanical stress derived from an environment to the piezoelectric device; and coupling electrical energy from the piezoelectric device.

公开(公告)号：US20180212137A1

公开(公告)日：2018-07-26

申请号：US15880907

申请日：2018-01-26

Applicant: THE TRUSTEES OF DARTMOUTH COLLEGE ,  FACEBOOK, INC.

Inventor： Zi Chen ,  John X.J. Zhang ,  Frances Lau ,  Ali Israr

IPC: H01L41/047 ,  H01L41/08 ,  H01L41/083 ,  H01L41/09 ,  A61B5/00

Abstract: A haptic stimulator includes a multilayer sheet with a piezoelectric or electroactive polymer layer adapted to mechanically deform upon application of voltage, the multilayer sheet secured to a substrate, and a source of electrical stimulation coupled to drive electrodes on the polymer layer with an AC signal to vibrate the polymer layer. In particular embodiments, the polymer contains polyvinylidene fluoride, and electrodes are patterned to control local electric fields. Another haptic stimulator has first and second electrodes with an air gap and an insulating sheet between first and second electrodes, with an AC voltage driver connecting to the electrodes. In a method of providing haptic stimulation to skin an alternating current supply drives first and second electrodes, the electrodes disposed upon either a piezoelectric or electroactive polymer sheet, vibrating the polymer layer by driving the electrodes; and coupling vibrations of the polymer layer to the sensate skin.

公开(公告)号：US20220118294A1

公开(公告)日：2022-04-21

申请号：US17503166

申请日：2021-10-15

Applicant: The Trustees of Dartmouth College

Inventor： Zi Chen ,  Jing Fan ,  Matthew Liao

IPC: A62B23/02 ,  A62B18/08 ,  A62B18/02 ,  A61F9/02 ,  A41D13/11 ,  B01D45/06 ,  B01D45/08 ,  B01D50/20

Abstract: This invention provides a see-through full face mask and hood that integrates effective filtration for both inhaled and exhaled air. The mask includes a transparent visor mounted on a headband and surrounded by a frame. The headband or the frame (sides, bottom, etc.) can include a filtration assembly that allows passive inflow and outflow of air in a manner that is highly breathable. The frame generally seals against the users face in a comfortable manner. The visor can be surrounded by a subframe that can be moved upwardly out of engagement with a base frame—which remains attached to the wearer to expose the user's mouth for eating. The filtration assembly defines a plurality of tortuous or circuitous-path filtration tubes that employ bends, baffles, charged surfaces and/or other internal barriers to redirect airflow and thereby trap microdroplets containing pathogens until such pathogens can be rendered inactive.

公开(公告)号：US11969554B2

公开(公告)日：2024-04-30

申请号：US17092827

申请日：2020-11-09

Applicant: The Trustees of Dartmouth College ,  FACEBOOK, INC.

Inventor： Zi Chen ,  John X. J. Zhang ,  Frances Lau ,  Ali Israr

IPC: H10N30/857 ,  A61F2/70 ,  A61M21/00 ,  B06B1/02 ,  B06B1/06 ,  A61F2/54 ,  A61F2/68

CPC classification number: A61M21/00 ,  A61F2/70 ,  B06B1/0238 ,  B06B1/0688 ,  H10N30/857 ,  A61F2002/543 ,  A61F2002/6827 ,  A61M2021/0022 ,  A61M2205/0294 ,  B06B2201/55 ,  B06B2201/76

Abstract: A haptic stimulator includes a multilayer sheet with a piezoelectric or electroactive polymer layer adapted to mechanically deform upon application of voltage, the multilayer sheet secured to a substrate, and a source of electrical stimulation coupled to drive electrodes on the polymer layer with an AC signal to vibrate the polymer layer. In particular embodiments, the polymer contains polyvinylidene fluoride, and electrodes are patterned to control local electric fields. Another haptic stimulator has first and second electrodes with an air gap and an insulating sheet between first and second electrodes, with an AC voltage driver connecting to the electrodes. In a method of providing haptic stimulation to skin an alternating current supply drives first and second electrodes, the electrodes disposed upon either a piezoelectric or electroactive polymer sheet, vibrating the polymer layer by driving the electrodes; and coupling vibrations of the polymer layer to the sensate skin.

公开(公告)号：US10833245B2

公开(公告)日：2020-11-10

申请号：US15880907

申请日：2018-01-26

Applicant: THE TRUSTEES OF DARTMOUTH COLLEGE ,  FACEBOOK, INC.

Inventor： Zi Chen ,  John X. J. Zhang ,  Frances Lau ,  Ali Israr

IPC: H01L41/047 ,  H01L41/08 ,  A61B5/00 ,  H01L41/09 ,  H01L41/083 ,  H01L41/193 ,  G08B6/00 ,  G06F3/01

Abstract: A haptic stimulator includes a multilayer sheet with a piezoelectric or electroactive polymer layer adapted to mechanically deform upon application of voltage, the multilayer sheet secured to a substrate, and a source of electrical stimulation coupled to drive electrodes on the polymer layer with an AC signal to vibrate the polymer layer. In particular embodiments, the polymer contains polyvinylidene fluoride, and electrodes are patterned to control local electric fields. Another haptic stimulator has first and second electrodes with an air gap and an insulating sheet between first and second electrodes, with an AC voltage driver connecting to the electrodes. In a method of providing haptic stimulation to skin an alternating current supply drives first and second electrodes, the electrodes disposed upon either a piezoelectric or electroactive polymer sheet, vibrating the polymer layer by driving the electrodes; and coupling vibrations of the polymer layer to the sensate skin.