Juil Lee
Juil Lee, Sewickley, PA US
Patent application number | Description | Published |
---|---|---|
20080304395 | Air Gap Servo For Optical Recording - A device reads and/or records marks in a track on a record carrier via near field optical recording. The device has a head including a lens to be positioned at a near field distance from a surface of the record carrier. An air gap controller is for controlling an air gap ( | 12-11-2008 |
20090115429 | Simultaneous Detection of In-Plane and Out-Of-Plane Position Displacement With Capacitive Sensors - An apparatus includes a first capacitive sensor connected to a first supply voltage, a second capacitive sensor connected to a second supply voltage, a sensing circuit for producing a sense voltage in response to current flowing in the first and second capacitive sensors, a first mixer for combining the sense voltage with a first reference voltage to produce a first signal representative of in-plane displacement between electrodes of the first and second capacitive sensors, and a second mixer for combining the sense voltage with a second reference voltage to produce a second signal representative of out-of-plane displacement between the electrodes of the first and second capacitive sensors. | 05-07-2009 |
20100157760 | OPTICAL STORAGE MEDIUM WITH LIMITED ACCESS - The present invention relates to an optical storage medium ( | 06-24-2010 |
20100177429 | Readback Signal-Based Head-Disc Contact Detection Using AM/FM Demodulation - A method includes: producing a readback signal using a recording head positioned adjacent to a recording medium, amplitude demodulating the readback signal to produce an amplitude demodulated signal, frequency demodulating the readback signal to produce a frequency demodulated signal, and using the amplitude demodulated signal and the frequency demodulated signal to determine contact of the recording head with the recording medium. An apparatus that can be used to implement the method is also provided. | 07-15-2010 |
Juil Lee, Eindhoven NL
Patent application number | Description | Published |
---|---|---|
20080267036 | Air Gap Servo for Optical Recording - A device reads and/or records marks in a track on a record carrier via near field optical recording. The device has a head including a lens to be positioned at a near field distance from a surface of the record carrier. An air gap controller is for controlling an air gap between the lens and the surface, and has an approach mode for bringing the lens from a remote distance in the far field ( | 10-30-2008 |
20090028021 | Radial To Focus Cross Talk Cancellation In Optical Storage Systems - A signal processing technique is proposed for compensating for radial to focus crosstalk in an optical storage system including an astigmatic lens ( | 01-29-2009 |
Juil Lee, Pittsburgh, PA US
Patent application number | Description | Published |
---|---|---|
20080205207 | Radial Tracking Method and Apparatus for an Optical Information Carrier Format with Non-Uniformly Spaced Tracks - A radial tracking method for an optical information carrier format with non-uniformly spaced tracks is disclosed, wherein a plurality of tracks ( | 08-28-2008 |
Juil Lee, Eden Prairie, MN US
Patent application number | Description | Published |
---|---|---|
20140269241 | HIGH SAMPLE RATE DPES TO IMPROVE CONTACT DETECTION SIGNAL TO NOISE RATIO - Using a high sample rate dPES, together with pulsed heater and lock-in technique, to improve dPES SNR for contact detection between the head and media surface. Steps of powering a transducing head actuator with pulsed input signal at a select data track offset from a previously-written to data track of the storage medium, where the pulsed input signal has select amplitude and duty cycle to simulate a response signal, and further locking in an amplitude with respect to the heater frequency, can lead to a determination of level of heater power for initiating contact between the transducing head and the storage medium. | 09-18-2014 |