Min Chen

US Patent:

6448545, Sep 10, 2002

Filed:

Jan 18, 2000

Appl. No.:

09/483005

Inventors:

Min Chen - Brookline MA

Assignee:

Syncrotronics Corp. - Chestnut Hill MA

International Classification:

H01J 4014

US Classification:

250214VT, 2502141, 2502081

Abstract:

An imaging system is disclosed for use in low-light environments or environments where low-levels of such radiation is desirable. Examples of such environments are endoscopy, laparoscopy, mammography and night photography. In the case of radiation that is other than visible light, a radiation converter and method for fabricating same is disclosed. The radiation converter comprises a film of heavy scintillator (e. g. CdWO ) coated on a fiber optical window to efficiently convert the radiation into visible light. The visible light is passed into a signal amplifier employing a focussing electron-bombarded charge-couple device (FEBCCD) or a focussing electron-bombarded complementary metal-oxide semiconductor (FEBCMOS) to amplify the signal. Novel methods of performing three-dimension imaging using this system as well as removing the effects of high-speed movement are also disclosed.

US Patent:

6920238, Jul 19, 2005

Filed:

Dec 3, 1996

Appl. No.:

09/254959

Inventors:

Min Chen - Brookline MA, US
Roudolf S. Shouvalov - Protvino, RU
Sergei Vasilievich Golovkine - Protvino, RU
Skiff Sokolov - Protvino, RU

Assignee:

Synchrotronics, Co. - Arlington MA

International Classification:

G06K009/00

US Classification:

382128, 378 984, 378 986, 378113

Abstract:

An imaging system is disclosed for use in low-light environments or environments where low-levels of such radiation is desirable. Examples of such environments are night photography, laparoscopy, and mammography. In the case of radiation that is other than visible light, a radiation converter and method for fabricating same is disclosed. The radiation converter comprises a film of heavy scintillator (e. g. CdWO4) coated on a fiber optical window to efficiently convert the radiation into visible light. The visible light is passed into a signal amplifier employing an electron-bombarded charge-couple device (EBCCD) to amplify the signal. Novel methods of performing three-dimension imaging using this system as well as removing the effects of high speed movement are also disclosed.

US Patent:

7035372, Apr 25, 2006

Filed:

Sep 6, 2002

Appl. No.:

10/236522

Inventors:

Min Chen - Brookline MA, US

Assignee:

Synchrotronics, Co. - Arlington MA

International Classification:

G01N 23/04

US Classification:

378 62, 378 988, 378 983

Abstract:

An imaging system is disclosed for use in low-light environments or environments where low-levels of such radiation is desirable. Examples of such environments are endoscopy, laparoscopy, mammography and night photography. In the case of radiation that is other than visible light, a radiation converter and method for fabricating same is disclosed. The radiation converter comprises a film of heavy scintillator (e. g. CdWO) coated on a fiber optical window to efficiently convert the radiation into visible light. The visible light is passed into a signal amplifier employing a focussing electron-bombarded charge-couple device (FEBCCD) or a focussing electron-bombarded complementary metal-oxide semiconductor (FEBCMOS) to amplify the signal. Novel methods of performing three-dimension imaging using this system as well as removing the effects of high-speed movement are also disclosed.

US Patent:

7440225, Oct 21, 2008

Filed:

Aug 21, 2006

Appl. No.:

11/507234

Inventors:

Min Chen - San Rafael CA, US
Zhi Wang - Irvine CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B 5/596

US Classification:

360 7804, 360 7809

Abstract:

A disk drive is disclosed including a disk having a plurality of servo tracks, wherein each servo track comprises a plurality of servo sectors forming N servo wedges, and a wedge time period (WTP) occurs between each servo wedge. A VCM control signal is generated by generating an estimated WTP by detecting the servo sectors, estimating a pivot velocity in response to the estimated WTP, the pivot velocity representing a velocity of an actuator arm about a pivot, generating a pivot friction compensation in response to the estimated pivot velocity, and generating the VCM control signal in response to the pivot friction compensation.

US Patent:

7589593, Sep 15, 2009

Filed:

Jan 30, 2008

Appl. No.:

12/022159

Inventors:

Jie-Wei Lai - Taipei, TW
Min Chen - Fremont CA, US

Assignee:

Mediatek Inc. - Hsin-Chu

International Classification:

H03F 3/04
H03F 1/22

US Classification:

330295, 330311

Abstract:

An amplifier circuit for amplifying an input signal to generate an output signal is provided. The amplifier circuit has a stacked main amplifier, a parallel sub-amplifier, and a signal combiner. The stacked main amplifier includes a first amplifier unit for outputting a first amplified signal generated from processing the input signal; and a second amplifier unit for outputting a second amplified signal generated from processing the first amplified signal. The first amplifier unit and the second amplifier unit share bias current. The parallel sub-amplifier is coupled to the stacked main amplifier according to a parallel connection fashion, and outputs a third amplified signal generated from processing the input signal. The signal combiner combines the second amplified signal and the third amplified signal to generate the output signal.

US Patent:

7595954, Sep 29, 2009

Filed:

Apr 18, 2006

Appl. No.:

11/406089

Inventors:

Min Chen - San Jose CA, US
Li Yi - Berkeley CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B 5/596

US Classification:

360 7708, 360 7704

Abstract:

Disclosed is a method of estimating repeatable runout (RRO) for a disk drive. The method includes: determining a plurality of position error signal (PES) values for a plurality of servo wedges of a track of a disk; and estimating repeatable runout (RRO) in the PES values for the servo wedges of the track by averaging determined PES values over a pre-determined number of revolutions of the disk of the disk drive and scaling the averaged PES values by a pre-determined ratio of the variance of non-repeatable runout (NRRO) to the variance of an optimal estimation of the RRO for the disk drive.

US Patent:

7616399, Nov 10, 2009

Filed:

Dec 7, 2006

Appl. No.:

11/635904

Inventors:

Min Chen - San Rafael CA, US
Zhi Wang - Irvine CA, US
Duc T. Phan - Saratoga CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B 5/596

US Classification:

360 7708

Abstract:

A disk drive comprising a moveable head, a disk, and a servo controller that implements servo control techniques to preserve PES continuity during track following operations is disclosed. The disk includes a plurality of tracks in which a substantial majority of the tracks include a plurality of servo sectors having a plurality of servo bursts that are utilized in track following operations. The servo controller controls track following operations with the moveable head and implements operations to preserve PES continuity during track following. These operations include: dividing tracks of the disk into a plurality of zones wherein each zone includes zone boundaries; and utilizing a PES equation for each zone to generate a PES value based upon read servo bursts wherein each zone PES equation includes a normalizing factor to account for boundary conditions associated with zone boundaries to preserve PES value continuity between zones.

US Patent:

7675707, Mar 9, 2010

Filed:

Nov 21, 2008

Appl. No.:

12/275989

Inventors:

Min Chen - San Leandro CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B 21/02

US Classification:

360 75

Abstract:

A disk drive is disclosed comprising a disk, a head actuated over the disk, and control circuitry operable to generate a fly height control signal. A fly height of the head is measured, and the measured fly height is combined with a target fly height and a feedforward signal, wherein the feedforward signal is generated according to:acos(2πnk/N)+bsin(2πnk/N)where aand bare coefficients and 2πnk/N represents a frequency of a repeatable disturbance in the fly height of the head.