Kwan, Hong Kong
Albert Kwok Hung Kwan, Hong Kong CN
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20140065349 | REINFORCED ARCHITECTURAL PANEL - An architectural panel includes a substantially rectangular prismatic main body cast from lightweight concrete that has first and second major faces which are substantially planar and parallel to one another. First and second reinforcing mesh sheets are disposed substantially parallel to one another, next to the first and second major faces, respectively, and embedded in the main body. Recesses are arrayed in the first major face. Each recess extends through a respective opening in the first mesh sheet. | 03-06-2014 |
Chi Leung Kwan, Hong Kong HK
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20130305909 | RAW SOUND DATA ORGANIZER - A raw sound data organizer includes a processing unit configured to extract and convert an input into a digital format, and a display unit connected to the processing unit. The processing unit is configured to convert the input into a sequence of digital data and display the sequence of digital data in a form of a multi-dimensional color representation through the display unit. A raw sound data organizing method is also provided. | 11-21-2013 |
20150310876 | RAW SOUND DATA ORGANIZER - A raw sound data organizer includes a processing unit configured to extract and convert an input into a digital format, and a display unit connected to the processing unit. The processing unit is configured to convert the input into a sequence of digital data and display the sequence of digital data in a form of a multi-dimensional color representation through the display unit. A raw sound data organizing method is also provided. | 10-29-2015 |
Hing Kit Kwan, Hong Kong HK
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20100315748 | ESD Protection using a Capacitivly-Coupled Clamp for Protecting Low-Voltage Core Transistors from High-Voltage Outputs - An electro-static-discharge (ESD) protection circuit protects core transistors. An internal node to the gate of an n-channel output transistor connects to the drain of an n-channel gate-grounding transistor to ground. The gate of the gate-grounding transistor is a coupled-gate node that is coupled by an ESD coupling capacitor to the output and to ground by an n-channel disabling transistor and a leaker resistor. The gate of the n-channel disabling transistor is connected to power and disables the ESD protection circuit when powered. An ESD pulse applied to the output is coupled through the ESD coupling capacitor to pulse high the coupled-gate node and turn on the gate-grounding transistor to ground the gate of the n-channel output transistor, which breaks down to shunt ESD current. The ESD pulse is prevented from coupling through a parasitic Miller capacitor of the n-channel output transistor by the gate-grounding transistor. | 12-16-2010 |
20110216559 | Constant-Current Control Module using Inverter Filter Multiplier for Off-line Current-Mode Primary-Side Sense Isolated Flyback Converter - A fly-back AC-DC power converter has a constant-current control loop that senses the primary output current in a transformer to control the secondary output without an expensive opto-isolator. A primary-side control circuit can use either a Quasi-Resonant (QR) or a Pulse-Width-Modulation (PWM) control loop to switch primary current through the transformer on and off. A feedback voltage is compared to a primary-side voltage sensed from the primary current loop to turn the switch on and off. A multiplier loop generates the feedback voltage using a multiplier. A level-shift inverter and a low-pass filter act as the multiplier by multiplying an off duty cycle of the switch by the feedback voltage to generate a filtered voltage. A high-gain error amp compares the filtered voltage to a reference voltage to generate the feedback voltage. The multiplier produces a simple relationship between the secondary current and the reference voltage, yielding simplified current control. | 09-08-2011 |
20120126901 | PROGRAMMABLE ELECTRO-MAGNETIC-INTERFERENCE (EMI) REDUCTION WITH ENHANCED NOISE IMMUNITY AND PROCESS TOLERANCE - A frequency dithering circuit reduces emissions that cause Electro-Magnetic Interference (EMI) by spreading the spectrum of a clock. The clock sequences a counter that drives a digital count value to a digital-to-analog converter (DAC). The DAC outputs a sawtooth wave with a wide voltage swing. A subtractor scales down the voltage swing to produce a reduced-swing sawtooth wave which is used as an upper limit voltage. Comparators trigger a set-reset latch to toggle the clock when current pumps charge and discharge a capacitor beyond voltage limits. Since the upper limit voltage is the reduced sawtooth wave from the subtractor, the amount of time to charge the capacitor varies, dithering the period of the clock. The degree of dithering can be adjusted by programming the feedback resistance in the subtractor. The subtractor reduces the sensitivity of dithering to errors in the DAC, allowing for an inexpensive, less precise DAC. | 05-24-2012 |
20130294118 | Output Current Estimation for an Isolated Flyback Converter With Variable Switching Frequency Control and Duty Cycle Adjustment for Both PWM and PFM Modes - A fly-back power converter has a current-estimating control loop that senses the primary output current in a transformer to control the secondary output. A primary-side control circuit switches primary current through the transformer on and off. A discharge time when a secondary current through an auxiliary winding of the transformer is flowing is generated by sampling a voltage divider on an auxiliary loop for a knee-point. A normalized duty cycle is calculated by multiplying the discharge time by a current that is proportional to the switching frequency and comparing to a sawtooth signal having the switching frequency. The peak of a primary-side voltage is sensed from the primary current loop and converted to a current and multiplied by the normalized duty cycle to generate an estimated current. An error amp compares the estimated current to a reference to adjust the oscillator frequency and peak current to control primary switching. | 11-07-2013 |
20150381054 | LED Driver with Small Output Ripple Without Requiring a High-Voltage Primary-Side Electrolytic Capacitor - A power converter reduces output ripple without using an electrolytic primary-side capacitor that can reduce product lifetime. Primary-Side Regulation (PSR) using an auxiliary winding provides a regulated secondary voltage with some low-frequency ripple on a secondary winding of a transformer. A smaller secondary capacitor that is not an electrolytic capacitor filters the output of the secondary side. A bang-bang controller controls the secondary side current to reduce current ripple despite voltage ripple. The bang-bang controller has a series resistor and inductor in series with a load such as an LED. A voltage drop across the series resistor increases when a switch turns on. This increasing voltage drop toggles the switch off once an upper limit voltage is reached. The voltage drop then decreases as inductor current is shunted by a diode, until the voltage drop reaches a lower limit voltage and the switch toggles on again. | 12-31-2015 |
Kai Cheong Kwan, Hong Kong HK
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20100226010 | Anti-Shaking Optical Element For Optical Imaging Systems - The present invention provides an optical system comprising, at least one lens group for projecting an image on an image sensing means, an optical path being defined between a light entrance of said optical system and said image sensing means, a reflective optical element having convergent or divergent optical power and being located in said optical path, and means for moving the reflective optical element in response to unwanted movement of the imaging system to eliminate or mitigate the negative imaging effect of the said unwanted movement. | 09-09-2010 |
Kin Pui Kwan, Hong Kong CN
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20110284495 | ETCH ISOLATION LPCC/QFN STRIP - Various structures and fabrication methods for leadless plastic chip carrier (QFN) packages which utilize carriers in strip format, wherein the leads (or terminals) are formed to be electrically isolated from one another within each unit and in which the units are formed to be electrically isolated from one another within the strip using chemical etching techniques. | 11-24-2011 |
Lee Chi Kwan, Hong Kong CN
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20150207402 | Electronic Apparatus and Control Method for High Frequency AC to DC Conversion - A high-frequency ac-dc power converter takes an input ac signal and converts it to an output dc signal. The converter has at least two front-end rectifier diodes arranged as a full wave rectifier of the input ac signal. A first inductor positioned at the output of the full wave rectifier. An output capacitor is connected across a load for the converter. There are at least one additional inductor and one additional capacitor. A switching circuit selectively forms different (LC) resonant circuits with the inductors and capacitors during a cycle of the input ac signal to form a dc-dc power converter. | 07-23-2015 |
Man Shing Kwan, Hong Kong CN
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20160135032 | BEACON ASSISTED COMMERCIAL RECOGNITION SYSTEM - A system, comprising a primary communication path, a first communication device interfaced with the primary communication path, a second communication device interfaced with the primary communication path for communicating over the primary communication path to the first communication device, a controller for controlling the communication path between the first and second communication devices to allow or inhibit communication there over, a validation communication path, a first validation node interfaced with the validation communication path, a second validation node interfaced with the validation communication path for communicating with the first validation node over the validation communication path where in the presence of a transmission between the first and second validation nodes over the validation communication path constitutes a validation condition to control the mode of operation of the communication to be at least one of inhibiting communication over the primary communication path or allowing communication over the primary communication path. | 05-12-2016 |
Man W. Kwan, Hong Kong CN
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20100272194 | Channel Estimation Techniques for OFDM - An Orthogonal Frequency Division Multiplexing (OFDM) receiver comprises: a channel estimator receiving a signal that includes a plurality of symbols, each of the symbols including a plurality of pilots and a plurality of data subcarriers, wherein each symbol further includes at least one pilot subcarrier, the estimator using a first channel response estimate of the at least one pilot subcarrier in a first symbol to select a first weight matrix from a plurality of pre-generated weight matrices, and generating channel estimation information for data subcarriers in the first symbol using the selected first weight matrix. | 10-28-2010 |
Patrick Kwok Leung Kwan, Hong Kong CN
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20150027555 | MICROFLUIDIC PLATFORM AND METHOD FOR CONTROLLING THE SAME - A microfluidic platform including a microfluidic layer and a contact layer. The microfluidic layer is embedded with a microfluidic structure including a micro-channel and a fluidic sample contained in the micro-channel. The contact layer is able to be attached to the microfluidic layer, and includes a first heater for heating a first area of the microfluidic structure to a first temperature and a second heater for heating a second area of the microfluidic structure to a second temperature. The microfluidic layer and the contact layer rotate together during operation. A method for controlling a sample in the micro-channel of the microfluidic structure. | 01-29-2015 |
Po Kwong Kwan, Hong Kong HK
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20100039609 | Eyeglass Assembly - An eyeglass assembly | 02-18-2010 |
Po Kwong Kwan, Hong Kong CN
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20090051868 | SPECTACLE FRAME - A spectacle frame is disclosed as including a pair of mounting frames each for releasably holding a piece of optical lens, and a nose pad engaged with each respective mounting frame, in which the nose pad is swivellable about the respective mounting frame about a respective axis which lies generally on a plane containing the respective mounting frame. There is also disclosed a pair of spectacles including such a spectacle frame. | 02-26-2009 |
20090079933 | Spectacle Frame Assembly - A spectacle frame assembly is disclosed as including a pair of arm members, a spectacle frame for holding two pieces of optical lenses, and two nose pads engaged with the spectacle frame each via a ball and socket joint. | 03-26-2009 |
Pui Tong Kwan, Hong Kong CN
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20160074657 | Head-wearing wireless control transcranial electrical stimulation device - A head-wearing wireless control transcranial electrical stimulation device includes a head-wearing part and a remote control part. An integrated circuit board is arranged within a cavity of a first end of the head-wearing part. The integrated circuit board controls a microcontroller. The microcontroller is connected with and controls a plurality of electrodes for contacting a human body through circuit modules. The microcontroller receives a control instruction from the remote control part through a Bluetooth communication terminal, and then controls the plurality of the electrodes to exert an alternating current or a direct current having preset density and frequency to a cerebral cortex. The microcontroller receives an electrode feedback signal, and sends the electrode feedback signal after being pre-processed to a display module of the remote control part to be displayed through the Bluetooth communication terminal. | 03-17-2016 |
Siu Ming Kwan, Hong Kong CN
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20150238433 | Design and Manufacture of Nonelectronic, Active-Infusion Patch and Device for Transdermal Delivery Across Skin - Transdermal patches and devices for delivery of therapeutic drug and/or cosmetic formulations through an intact or porated skin barrier are described. Active-infusion delivers controlled dosing over a period of time to provide long-term efficacy. Methods and devices for preparing active-infusion patches for controlled dose delivery by nonelectronic means and methods of skin poration that is safe and painless are described. | 08-27-2015 |
Terance Chan Yuk Kwan, Hong Kong HK
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20110162866 | Multimedia Cable - A multimedia cable, particularly one designed to carry digital signals in accordance with an HDMI standard, which comprises two or more concentric rings of conductor cores arranged about a central conductor core. | 07-07-2011 |
Wai Lun Allan Kwan, Hong Kong CN
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20140217847 | BRUSHLESS PERMANENT MAGNET MOTOR - A brushless permanent magnet electric motor ( | 08-07-2014 |
Wanyin Kwan, Hong Kong CN
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20110235214 | Magnetoresistive sensor, magnetic head, head gimbal assembly, and disk drive unit with the same - A MR sensor includes a first shielding layer, a second shielding layer, a MR element formed therebetween, and a pair of hard magnet layers respectively placed on two sides of the MR element. The MR element comprises an AFM layer formed on the first shielding layer, a pinned layer formed on the AFM layer and a free layer formed between the pinned layer and the second shielding layer. The free layer is funnel-shaped, which having a first edge facing the air bearing surface and a second edge opposite the first edge, and the first edge has a narrower width than that of the second edge. The structure of the MR sensor can improve MR height control performance, and improve the ESD performance and decrease the PCN and RTN and, in turn, get a more stable performance. The present invention also discloses a magnetic head, a HGA and a disk drive unit. | 09-29-2011 |
20120099227 | Magnetoresistive Sensor, magnetic head, head gimbal assembly and disk drive unit with the same - A MR sensor comprises a first shielding layer, a second shielding layer, a MR element and a pair of hard magnet layers sandwiched therebetween, and a non-magnetic insulating layer formed at a side of the MR element far from an air bearing surface of a slider. The MR sensor further comprises a first non-magnetic conducting layer formed between the first shielding layer and the MR element, and the first non-magnetic conducting layer is embedded in the first shielding layer and kept separate from the ABS. The MR sensor of the invention can obtain a narrower read gap to increase the resolution power and improve the reading performance, and obtain a strong longitudinal bias field to stabilize the MR sensor so as to increase the total sensor area and, in turn, get an improved reliability and performance. The present invention also discloses a magnetic head, a HGA and a disk drive unit. | 04-26-2012 |
20120249130 | Method for measuring longitudinal bias magnetic field in a tunnel magnetoresistive sensor - A method for measuring longitudinal bias magnetic field in a tunnel magnetoresistive sensor of a magnetic head, the method includes the steps of: applying an external longitudinal time-changing magnetic field onto the tunnel magnetoresistive sensor; determining a shield saturation value of the tunnel magnetoresistive sensor under the application of the external longitudinal time-changing magnetic field; applying an external transverse time-changing magnetic field and an external longitudinal DC magnetic field onto the tunnel magnetoresistive sensor; determining a plurality of different output amplitudes under the application of the external transverse time-changing magnetic field and the application of different field strength values of the external longitudinal DC magnetic field; plotting a graph according to the different output amplitudes and the different field strength values; and determining the strength of the longitudinal bias magnetic field according to the graph and the shield saturation value. | 10-04-2012 |
20120287529 | Close loop method for measuring head SNR and media SNR - A close loop method for measuring head SNR, for a storage device comprising a storage media and a head, comprising steps of: (a) loading the head on the media with a dynamic fly height; (b) measuring an initial environmental temperature value Ti and measuring the head signal signal | 11-15-2012 |
20140334279 | TESTING METHOD OF A MAGNETIC HEAD, AND TESTING APPARATUS THEREOF - A testing method of a magnetic head includes: applying a first magnetic field with a constant intensity in a first direction that is the same with that of the longitudinal bias field to the magnetic head, simultaneously applying a second magnetic field with variant intensities in a second direction traversing the air bearing surface, and measuring a first noise; applying a third magnetic field with a constant intensity in a third direction that is opposite to the first direction to the magnetic head, simultaneously applying the second magnetic field with variant intensities in the second direction, and measuring a second noise; and analyzing noise change between the first noise and the second noise. The invention can screen out defective magnetic heads that possess poor noise characteristic and unstable performance. | 11-13-2014 |
Wing Cheuk Kwan, Hong Kong CN
Ying Kwan, Hong Kong HK
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20150281408 | METHODS AND SYSTEMS FOR IDENTIFYING DATA SESSIONS AT A VPN GATEWAY - Methods and systems for identifying Internet Protocol (IP) data sessions at a VPN gateway. The VPN gateway receives encapsulating packets, wherein the encapsulating packets encapsulate IP packets. A corresponding VPN connection through which the encapsulating packets are received is identified. The VPN gateway decapsulates the encapsulating packets to retrieve the IP packets and performs deep packet inspection (DPI) on the IP packets in order to identify one or more data sessions that the IP packets belong to. A DPI database is updated accordingly, based on, at least in part, the one or more data sessions. | 10-01-2015 |
Yiu Fai Kwan, Hong Kong CN
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20100155260 | MICRO-BLASTING TREATMENT FOR LEAD FRAMES - Method of manufacturing a lead frame wherein a bare lead frame material is immersed in a salt solution. Gas bubbles are provided in the salt solution next to the bare lead frame material such that the bubbles contact a surface of the lead frame material and pop in proximity to the bare lead frame material causing chemical reactions on the surface of the lead frame, thereby forming a plurality of dimples of irregular sizes on the surface of the lead frame. | 06-24-2010 |
Yiu Fai Kwan, Hong Kong HK
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20080216921 | LEADFRAME TREATMENT FOR ENHANCING ADHESION OF ENCAPSULANT THERETO - A method is provided for treating a leadframe comprising copper or copper alloy to enhance adhesion of molding compound to it. The leadframe is oxidized in an oxidation treatment bath to form copper oxide on the surface of the leadframe. It is then dipped in a complexing or chelating agent to enhance the purity of the copper oxide formed. Thereafter, the leadframe is cleaned with an acid to remove any contaminants remaining on the leadframe. | 09-11-2008 |
20080233683 | PRE-PLATED LEADFRAME HAVING ENHANCED ENCAPSULATION ADHESION - A process for producing a pre-plated leadframe that has enhanced adhesion by molding compound is provided, wherein a base leadframe material is first plated with multiple layers of metallic material. Thereafter, the plated base leadframe material is covered with a mask, so as to expose selected surfaces thereof at unmasked areas where enhanced adhesion of molding compound is desired. The said unmasked areas are plated with a layer of copper before removing the mask. Optionally, the layer of copper may further be oxidized to form a layer of specially controlled copper oxide. | 09-25-2008 |
20130098659 | PRE-PLATED LEAD FRAME FOR COPPER WIRE BONDING - A pre-plated lead frame comprises a substrate comprising copper or a copper alloy which has a first side and a second side opposite to the first side. A first plating layer comprising nickel is plated on the first and second sides of the substrate and a second plating layer comprising palladium is plated onto the first plating layer on the first and second sides of the substrate. A third plating layer comprising gold is then plated onto the second plating layer on the second side of the substrate, the third plating layer on the second side of the substrate having a thickness of more than 3 nm. On the first side of the substrate, there is either no gold plated onto the second plating layer, or a third plating layer comprising gold plated onto the second plating layer which has a thickness of 1.5 nm or less. | 04-25-2013 |
Yiu Wa Kwan, Hong Kong CN
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20150027555 | MICROFLUIDIC PLATFORM AND METHOD FOR CONTROLLING THE SAME - A microfluidic platform including a microfluidic layer and a contact layer. The microfluidic layer is embedded with a microfluidic structure including a micro-channel and a fluidic sample contained in the micro-channel. The contact layer is able to be attached to the microfluidic layer, and includes a first heater for heating a first area of the microfluidic structure to a first temperature and a second heater for heating a second area of the microfluidic structure to a second temperature. The microfluidic layer and the contact layer rotate together during operation. A method for controlling a sample in the micro-channel of the microfluidic structure. | 01-29-2015 |