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公开(公告)号：US20200328341A1
公开(公告)日：2020-10-15
申请号：US16304817
申请日：2017-06-07
发明人： ACHIM HILGERS , MARK THOMAS JOHNSON
IPC分类号： H01L41/193 , H01L41/09
摘要： The invention provides an electroactive polymer actuator comprising a capacitance compensation means adapted to at least partially offset any changes in the capacitance across the member induced by its deformation. In this way, the electronic control of the device is rendered much simpler, since a varying capacitance across the actuator member does not have to be accounted for when driving the actuator to perform a particular deformation.
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2.发明申请公开(公告)号：US20200301059A1
公开(公告)日：2020-09-24
申请号：US16088091
申请日：2017-03-22
发明人： YANNYK PARULIAN JULIAN BOURQUIN , JOSEPH PETRUS HENRICUS TER BORCH , PETRUS THEODORUS JUTTE , KIRAN KUMAR THUMMA , BASTIAAN WILHELMUS MARIA MOESKOPS , RIEKO VERHAGEN , MARK THOMAS JOHNSON
摘要： There is provided a method of manufacturing a cutting element for use in a hair cutting device, the cutting element comprising an optical waveguide, the method comprising providing a preform for an optical waveguide, the preform comprising a core and an outer layer, wherein the outer layer is arranged around the core along the length of the core; forming a shaped preform by removing a portion of the outer layer along the length of the core to expose part of the core, wherein a remaining portion of the outer layer is a support structure for the core; heating the shaped preform; and pulling the shaped preform in the direction of the axis of the core to reduce the cross-section of the shaped preform and form the optical waveguide. Also provided is a cutting element manufactured according to the above method and a cutting element for use in a hair cutting device, the cutting element comprising an optical waveguide comprising a core and a support structure, wherein the support structure contacts the core along the length of the core to support the core, and wherein part of the core is exposed along the length of the core to form a cutting face for contacting hair. The thickness of the support structure tapers linearly or non-linearly from a thin side at which the support structure contacts the core to a thick side.
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公开(公告)号：US20200168783A1
公开(公告)日：2020-05-28
申请号：US16611870
申请日：2018-05-23
IPC分类号： H01L41/04 , H01L41/09 , H01L41/193
摘要： The proposed concept of driving an electroactive polymer actuator (70) makes use of a memory, comprising for example a look-up table (74), which stores data representing changes in actuation level over time for switching from a first actuation state to a second actuation state. A controller (76) controls a driver (72) to apply a drive waveform between two drive voltages, taking into account said stored data. In this way, non-ideal response (hysteresis, creep) of the actuator material is taken into account, so that the actuator may be operated as quickly and precise as possible. It is particularly suitable for ferroelectric relaxor polymers such as PVDF.
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公开(公告)号：US20200078091A1
公开(公告)日：2020-03-12
申请号：US16468736
申请日：2017-12-08
发明人： RIEKO VERHAGEN , BASTIAAN WILHELMUS MARIA MOESKOPS , KIRAN KUMAR THUMMA , MARK THOMAS JOHNSON , MARIUS IOSIF BOAMFA
IPC分类号： A61B18/20
摘要： There is provided a cutting element for use in a hair cutting device. The cutting element includes an optical waveguide having an optical axis and a sidewall, wherein a portion of the sidewall forms a cutting face for contacting hair; wherein the optical waveguide includes a plurality of structures formed along the optical axis, the structures having a refractive index which is different to a refractive index of the optical waveguide. A hair cutting device comprising a cutting element, and a method of manufacturing an optical waveguide cutting element are also disclosed.
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公开(公告)号：US20200035903A1
公开(公告)日：2020-01-30
申请号：US16488633
申请日：2018-02-27
IPC分类号： H01L41/04 , H01L41/193 , H01L41/09
摘要： The invention provides a field-driven electroactive material actuator that is driven by an actuation voltage. A driver is adapted to drive the actuation voltage from a first voltage level to a second voltage level, wherein the second voltage level is lower than the first, by way of a transition function, the transition function occurring over a transition time. The transition function includes a smoothing function. The transition time is at least 0.5 ms.
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公开(公告)号：US20190123256A1
公开(公告)日：2019-04-25
申请号：US16307164
申请日：2017-06-12
IPC分类号： H01L41/04 , H02M3/07 , H01L41/193
摘要： An actuator device comprises an electroactive polymer actuator (116) and a control circuit for driving the electroactive polymer actuator. The control circuit comprises a voltage boosting circuit including at least a capacitor (114; C11, C12, C13). An electroactive polymer layer (110) forms the electroactive polymer actuator in an active region (112) as well as a dielectric layer of the capacitor in a passive region (111). This provides integration of components to enable cost reductions and miniaturization.
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公开(公告)号：US20180375443A1
公开(公告)日：2018-12-27
申请号：US15776124
申请日：2016-12-01
摘要： A system comprises a power generator for generating electrical power and a switched capacitor converter for down-converting the output voltage of the power generator. The switched capacitor converter comprises a bank of capacitors and a switch arrangement. A controller is used for controlling the switches, based on a feedback signal from the power generator. This provides automatic control of the switched capacitor converter, thereby simplifying the overall control circuitry and improving efficiency.
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公开(公告)号：US20180294744A1
公开(公告)日：2018-10-11
申请号：US15756095
申请日：2016-08-26
发明人： KUMAR ARULANDU , DAAN ANTON VAN DEN ENDE , LUTZ CHRISTIAN GERHARDT , MARK THOMAS JOHNSON , NEIL FRANCIS JOYE
摘要： The invention provides a device (and method) for generating electrical power, comprising an electrical power generator configured to generate an electrical output current using charge induction. A load capacitor is used for storing charge in response to the rectified electrical output current, wherein the load capacitor has a capacitance which increases with voltage. This means the voltage stored on the load capacitor becomes flatter as it is charged and discharged; in a relatively discharged state, the capacitance is reduced giving a relatively larger voltage based on the stored charge, and in a relatively charged state, the capacitance is increased giving a relatively smaller voltage based on the stored charge. This improves initial energy transfer from the generator towards the storage element (non-linear capacitor) and makes the output voltage more flat and easier for practical use.
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公开(公告)号：US20180248105A1
公开(公告)日：2018-08-30
申请号：US15752974
申请日：2016-08-01
IPC分类号： H01L41/04 , H01L41/113 , H01L41/09 , H01L41/193
CPC分类号： H01L41/042 , H01L41/0926 , H01L41/1132 , H01L41/193
摘要： Provided is a combined actuator and sensor device having an electroactive polymer (EAP) structure (22) and a controller for generating drive signals applied to the EAP structure. The controller is adapted to superpose a small high-frequency AC sensing signal (34) on top of a larger actuation drive signal (32), the sensing signal having a frequency which resonates with the mechanical resonance frequency or anti-resonance frequency of the EAP structure. Application of mechanical loads to the device may be identified in changes in the impedance of the EAP structure, caused by damping of the mechanical resonance. In this way the device facilitates simultaneous sensing and actuation. A corresponding method of simultaneous sensing and actuation is also provided.
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公开(公告)号：US20180242851A1
公开(公告)日：2018-08-30
申请号：US15752622
申请日：2016-08-31
CPC分类号： A61B5/01 , A61B1/0008 , A61B5/0048 , A61B5/0053 , A61B5/0531 , A61B5/0816 , A61B5/6843 , A61B5/7278 , A61B2560/0223 , A61B2560/0252 , G01K7/22 , G01K7/24 , G01L1/16 , G01L9/0005 , H01L41/042 , H01L41/0825 , H01L41/0926 , H01L41/1132 , H01L41/193
摘要： The invention provides an electroactive material (preferably electroactive polymer) sensor system, comprising an electroactive material sensor (22) and a control system (28) for performing measurements relating to the impedance of the electroactive material sensor at at least first and second different frequencies. From these measurements a temperature at the sensor and an external pressure or force applied to the sensor can be determined. The sensor can thus be used as a pressure sensor and as a temperature sensor. When used in combination with actuation, an electroactive material actuator with integrated temperature sensing functionality is able to measure the temperature at the exact actuator position, which is always closer than an external thermocouple.
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