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Kwan, Hong Kong
Hing Kit Kwan, Hong Kong HK
| Patent application number | Description | Published |
|---|---|---|
| 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 |
Kai Cheong Kwan, Hong Kong HK
| Patent application number | Description | Published |
|---|---|---|
| 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
| Patent application number | Description | Published |
|---|---|---|
| 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 |
Man W. Kwan, Hong Kong CN
| Patent application number | Description | Published |
|---|---|---|
| 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 |
Po Kwong Kwan, Hong Kong CN
| Patent application number | Description | Published |
|---|---|---|
| 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 |
Po Kwong Kwan, Hong Kong HK
| Patent application number | Description | Published |
|---|---|---|
| 20100039609 | Eyeglass Assembly - An eyeglass assembly | 02-18-2010 |
Terance Chan Yuk Kwan, Hong Kong HK
| Patent application number | Description | Published |
|---|---|---|
| 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 |
Wanyin Kwan, Hong Kong CN
| Patent application number | Description | Published |
|---|---|---|
| 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 |
Wing Cheuk Kwan, Hong Kong CN
Yiu Fai Kwan, Hong Kong HK
| Patent application number | Description | Published |
|---|---|---|
| 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 |
Yiu Fai Kwan, Hong Kong CN
| Patent application number | Description | Published |
|---|---|---|
| 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 |