Patents by Inventor Chengkuo Lee
Chengkuo Lee has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11988600Abstract: A gas sensor, a method of manufacturing a gas sensor, a method for fabricating a micro electro-mechanical system (MEMS) die for a heater or thermopile, and a micro electro-mechanical system (MEMS) die for a heater or thermopile. The gas sensor comprises a first micro electro-mechanical system (MEMS) die comprising a light source; a second MEMS die comprising a light detector; a sample chamber disposes in an optical path between the light source and the light detector; and a holder substrate; wherein the first and second MEMS dies are disposed on the holder substrate in a vertical orientation relative to the holder.Type: GrantFiled: December 8, 2017Date of Patent: May 21, 2024Assignees: National University of Singapore, The Regents of the University of CaliforniaInventors: Enrico Macrelli, Massimo Bruno Cristiano Alioto, Chengkuo Lee, Costas John Spanos, You Qian
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Patent number: 11965755Abstract: A triboelectric sensor comprises a substrate; at least one grid structure disposed in or on the substrate; and at least one electrode for collecting triboelectric charges that are generated by sliding of an object over a surface of the substrate; wherein the at least one grid structure is configured such that motion of the object is detectable from a signal generated by crossing of the object over at least part of the grid structure.Type: GrantFiled: October 14, 2019Date of Patent: April 23, 2024Assignee: NATIONAL UNIVERSITY OF SINGAPOREInventors: Chengkuo Lee, Qiongfeng Shi, Tao Chen
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Patent number: 11885141Abstract: Disclosed is a sensory flooring system. The flooring system comprises a plurality of flooring segments and, for each flooring segment, one or more electrode portions. Each electrode portion is responsive to a force applied to the flooring segment and at least one electrode portion of a said flooring segment forms an electrode with at least one electrode portion of another said flooring segment. Moreover, each flooring segment comprises a unique encoding of the one or more electrode portions. Also disclosed is a sensory floor such a sensory flooring system, a receiver for receiving an electrical output from the one or more electrodes formed by said one or more electrode portions of the flooring segments, and a processor for analysing the electrical output and identifying the flooring segment by which the electrical output was produced.Type: GrantFiled: October 10, 2020Date of Patent: January 30, 2024Assignee: National University of SingaporeInventors: Qiongfeng Shi, Chengkuo Lee
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Publication number: 20230409114Abstract: A system to provide a human-machine interface to enable a user in a real space to act/sense in a virtual space. The system includes: a ring wearable by a finger of the user; a plurality of sensors, and a plurality of feedback units. The plurality of sensors being multimodal, including: a tactile sensor disposed on an inner surface of the ring; and a temperature sensor disposed on an outer surface of the ring. The plurality of feedback units being multimodal, including: a vibrator disposed on the ring, the vibrator being disposed on the outer surface of the ring; and a heater disposed on the inner surface of the ring. The system includes a controller configured to drive the plurality of sensors and the plurality of feedback devices to enable concurrent multimodal sensing and multimodal feedback.Type: ApplicationFiled: June 14, 2023Publication date: December 21, 2023Applicant: National University of SingaporeInventors: Zhongda SUN, Chengkuo LEE, Minglu ZHU
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Publication number: 20230020111Abstract: A wearable human machine interface (HMI) comprises a plurality of triboelectric finger bending sensors configured to sense finger bending, deflecting or curling; a triboelectric palm sensor configured to detect an applied force and its direction; and at least one mechanical stimulator configured to provide haptic feedback. The human machine interface is configured to be worn on a human hand and may take the form of a glove.Type: ApplicationFiled: January 5, 2021Publication date: January 19, 2023Inventors: Minglu ZHU, Chengkuo LEE
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Publication number: 20220341188Abstract: Disclosed is a sensory flooring system. The flooring system comprises a plurality of flooring segments and, for each flooring segment, one or more electrode portions. Each electrode portion is responsive to a force applied to the flooring segment and at least one electrode portion of a said flooring segment forms an electrode with at least one electrode portion of another said flooring segment. Moreover, each flooring segment comprises a unique encoding of the one or more electrode portions. Also disclosed is a sensory floor such a sensory flooring system, a receiver for receiving an electrical output from the one or more electrodes formed by said one or more electrode portions of the flooring segments, and a processor for analysing the electrical output and identifying the flooring segment by which the electrical output was produced.Type: ApplicationFiled: October 10, 2020Publication date: October 27, 2022Inventors: Qiongfeng SHI, Chengkuo LEE
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Publication number: 20220255465Abstract: Disclosed herein are triboelectric nanogenerators (TENGs). Such TENGs comprise at least one tribolectric (TE) layer comprising two surfaces relative movement between which generates a TE charge, and a circuit. The circuit comprises a switch, a sensor, and a load. The switch has an open condition in which the TE charge accumulates (the accumulated TE charge), and a closed condition in which the accumulated TE charge discharges between the two surfaces across the load, the sensor determining a time constant (?) of discharge of the accumulated TE charge across the load.Type: ApplicationFiled: August 3, 2020Publication date: August 11, 2022Inventors: Hao WANG, Chengkuo LEE, Tianyiyi HE
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Publication number: 20210404844Abstract: A triboelectric sensor comprises a substrate; at least one grid structure disposed in or on the substrate; and at least one electrode for collecting triboelectric charges that are generated by sliding of an object over a surface of the substrate; wherein the at least one grid structure is configured such that motion of the object is detectable from a signal generated by crossing of the object over at least part of the grid structure.Type: ApplicationFiled: October 14, 2019Publication date: December 30, 2021Inventors: Chengkuo LEE, Qiongfeng SHI, Tao CHEN
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Publication number: 20210380821Abstract: Disclosed is a method for forming a sensory textile. The method includes: providing a conductive polymer, a dopant and a solvent; mixing the conductive polymer, dopant and solvent to form a mixture having a predetermined ratio of the conductive polymer and the dopant, and a predetermined concentration of the conductive polymer; contacting a fabric with the mixture to coat the fabric with the conductive polymer and dopant; and drying the coated fabric. Also disclosed is a sensory textile device that includes such a sensory textile, a conductive backing layer and a spacer layer disposed between the sensory textile and conductive backing layer.Type: ApplicationFiled: October 18, 2019Publication date: December 9, 2021Inventors: Tianyiyi HE, Chengkuo LEE, Qiongfeng SHI, Hao WANG, Minglu ZHU
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Publication number: 20210257932Abstract: A self-powered triboelectric based device, a self-powered triboelectric based device, a user interface, a method of providing user input, an energy harvesting device, a method of harvesting energy, a submersion-detecting device, and a method of submersion-detecting.Type: ApplicationFiled: July 11, 2019Publication date: August 19, 2021Applicant: NATIONAL UNIVERSITY OF SINGAPOREInventors: Chengkuo LEE, Qiongfeng SHI
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Publication number: 20190360924Abstract: A gas sensor, a method of manufacturing a gas sensor, a method for fabricating a micro electro-mechanical system (MEMS) die for a heater or thermopile, and a micro electro-mechanical system (MEMS) die for a heater or thermopile. The gas sensor comprises a first micro electro-mechanical system (MEMS) die comprising a light source; a second MEMS die comprising a light detector; a sample chamber disposes in an optical path between the light source and the light detector; and a holder substrate; wherein the first and second MEMS dies are disposed on the holder substrate in a vertical orientation relative to the holder.Type: ApplicationFiled: December 8, 2017Publication date: November 28, 2019Inventors: Enrico Macrelli, Massimo Bruno Cristiano Alioto, Chengkuo Lee, Costas John Spanos, You Qian
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Publication number: 20160346466Abstract: A microfluidic device (100) is disclosed. The device comprises a triboelectric sensor (102); an elastically deformable pump (104) arranged to transfer fluid to at least one fluid outlet (108) and triboelectrically activate the sensor; and first and second check valves (106a, 106b) respectively arranged at the inlet and outlet of the pump to control fluid transfer in and out of the pump. When the pump is actuated in conjunction with the check valves to transfer a volume of fluid, at least a portion of the sensor is triboelectrically activated according to an amount of deformation of the pump to generate a corresponding output voltage signal for enabling the volume of fluid transferred by the deformed pump to be determined. A corresponding method of using the device is also disclosed.Type: ApplicationFiled: May 25, 2016Publication date: December 1, 2016Applicant: National University of SingaporeInventors: Hao Wang, Zhuolin Xiang, Chengkuo Lee
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Publication number: 20160331326Abstract: Embodiments in accordance with the present disclosure are directed to non-invasive or essentially non-invasive electrode structures, assemblies, and devices for sensing neural signals carried or produced by peripheral nerves, and/or applying stimulation signals to peripheral nerves. Electrode structures, assemblies, and devices in accordance with embodiments of the present disclosure include (a) flexible epineural strip electrode structures having one or more elongate electrode-carrying strips that can be adhered (e.g.Type: ApplicationFiled: February 15, 2016Publication date: November 17, 2016Inventors: Zhuolin XIANG, Shih-Cheng YEN, Chengkuo LEE, Sanghoon LEE, Nitish V. THAKOR, Amitabha LAHIRI, Faith Ann BAZLEY, Ashwati VIPIN, Ignacio Delgado MARTINEZ, Angelo Homayoun ALL, Yen Xian PEH
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Publication number: 20120089117Abstract: An apparatus that includes a nano-projection array and an application unit configured to displace the nano-projection array to thereby deliver a composition (e.g., vaccine) to a controlled depth within the skin. The nano-projection array includes nano-projections carried by a carrier substrate. The application unit includes a peripheral structure and a displaceable carrier. The nano-projection array can be disposed within the peripheral structure. Displacement of the displaceable carrier causes a corresponding displacement to the nano-projection array. The displacement of the displaceable carrier can be controlled. For instance the distance of displacement of the displaceable carrier can be controlled. A method or process for manufacturing the apparatus is also provided.Type: ApplicationFiled: April 23, 2010Publication date: April 12, 2012Applicant: NATIONAL UNIVERSITY OF SINGAPOREInventors: Hans Junginger, Giorgia Pastorin, Minrui Zheng, Chengkuo Lee
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Patent number: 6996306Abstract: Electrostatically operated micro-optical devices and method of manufacturing such devices is disclosed. In a preferred embodiment, the micro-optical devices using electrostatic comb drive actuators having new spring designs to overcome side instability and exhibit enlarged displacement, having new designs of comb finger electrode shapes to generate larger force output, and having new clip type latch mechanism to control the corresponding device at certain states in an analog manner without electrical power consumption. Based on the proposed optical path and device configurations, integration and assembly of a plurality of reflective micro-mirrors in conjunction with proposed new comb drive actuators is very promising way to provide micro-optical devices to get good optical performance and suitable for multi-channel applications. We also disclose several process techniques to manufacture the micro-optical devices with said electrostatic comb drive actuator in a mass production manner with higher yield.Type: GrantFiled: August 25, 2003Date of Patent: February 7, 2006Assignee: Asia Pacific Microsystems, Inc.Inventors: Chih-Chung Chen, Chengkuo Lee, Yen-Jyh Lai, Wen-Chih Chen, Ming-Hung Tsai
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Patent number: 6947657Abstract: A variable optical attenuator for providing a new light attenuation mechanism based on using at least one of tilted mirrors to change and control the beam direction of reflected light beam toward output optical port in a two dimensional light path configuration is demonstrated to achieve the light attenuation in terms of changing and controlling the coupling loss among input optical port, reflective tilted mirrors, and output optical port. The tilted mirror is supported and connected by a suspended flexure spring at one side. This suspended spring is connected with tilted mirror at one side and is anchored on a substrate at the other side via a post (or a pivot). When the tilted mirror is driven by an actuator to generate movement including rotational mirror deflection and parallel mirror shifted displacement, the reflected light beam path is changed according to the particular mirror positions. The attenuation value is modified and controlled by the coupled light of reflected light beam to output port.Type: GrantFiled: May 28, 2004Date of Patent: September 20, 2005Assignee: Asian Pacific Microsystems, Inc.Inventors: Chihchung Chen, Chengkuo Lee
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Patent number: 6901182Abstract: Disclosed is a retro-reflective type optical signal processing device and method, particularly to a device includes a set of optical mirror planes with retro-reflective type layout and configuration, and a set of micro-shutters controlled by microelectromechanical actuators, whereas the optical signals in propagation can be blocked or partially blocked in terms of the position of said a set of micro-shutters corresponding to the optical signal transmission path, thereby the method of said approach to determine the range of attenuated optical signal is a variable optical attenuation function demonstrated by present invention. Such a retro-reflective type optical signal processing device and method further comprises a set of three reflective mirrors and micro-shutters with reflective mirrors. Thereby this device has the capability to switch 2 sets of retro-reflected optical light transmission paths, the method of said approach is a demonstration of 2×2 optical switching function.Type: GrantFiled: May 30, 2003Date of Patent: May 31, 2005Assignee: Asia Pacific Microsystems, Inc.Inventors: Jer-Liang A. Yeh, Chih-Chung Chen, Yen-Jyh Lai, Wen-Chih Chen, Chengkuo Lee
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Publication number: 20050047721Abstract: Electrostatically operated micro-optical devices and method of manufacturing such devices is disclosed. In a preferred embodiment, the micro-optical devices using electrostatic comb drive actuators having new spring designs to overcome side instability and exhibit enlarged displacement, having new designs of comb finger electrode shapes to generate larger force output, and having new clip type latch mechanism to control the corresponding device at certain states in an analog manner without electrical power consumption. Based on the proposed optical path and device configurations, integration and assembly of a plurality of reflective micro-mirrors in conjunction with proposed new comb drive actuators is very promising way to provide micro-optical devices to get good optical performance and suitable for multi-channel applications. We also disclose several process techniques to manufacture the micro-optical devices with said electrostatic comb drive actuator in a mass production manner with higher yield.Type: ApplicationFiled: August 25, 2003Publication date: March 3, 2005Inventors: Chih-Chung Chen, Chengkuo Lee, Yen-Jyh Lai, Wen-Chih Chen, Ming-Hung Tsai
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Publication number: 20040240779Abstract: Disclosed is a retro-reflective type optical signal processing device and method, particularly to a device includes a set of optical mirror planes with retro-reflective type layout and configuration, and a set of micro-shutters controlled by microelectromechanical actuators, whereas the optical signals in propagation can be blocked or partially blocked in terms of the position of said a set of micro-shutters corresponding to the optical signal transmission path, thereby the method of said approach to determine the range of attenuated optical signal is a variable optical attenuation function demonstrated by present invention. Such a retro-reflective type optical signal processing device and method further comprises a set of three reflective mirrors and micro-shutters with reflective mirrors. Thereby this device has the capability to switch 2 sets of retro-reflected optical light transmission paths, the method of said approach is a demonstration of 2×2 optical switching function.Type: ApplicationFiled: May 30, 2003Publication date: December 2, 2004Applicant: Asia Pacific Microsystems, Inc.Inventors: Jer-Liang A. Yeh, Chih-Chung Chen, Yen-Jyh Lai, Wen-Chih Chen, Chengkuo Lee
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Patent number: 6804036Abstract: Disclosed is an optical switch using V-beam electrothermal actuators, buckle beam springs, and movement translation mechanism with its bi-directional movable latched function for optical communication applications. In the preferred embodiments, various layout combinations of the V-beam electrothermal actuators, the buckle beam springs, a reflective mirror shutter connected to a shutter beam, and spatial joint to enable various operation approaches to realize the bi-stable switching function without external electrical load and electrical power consumption of said optical switch regarding the input optical signals transmitting toward the output channels, or the input optical signals transmitting forward to the reflective mirror shutter and then being reflected toward the output channel.Type: GrantFiled: August 18, 2003Date of Patent: October 12, 2004Assignee: Asia Pacific Microsystems, Inc.Inventors: Wen-Chih Chen, Chia-Yu Wu, Chengkuo Lee