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7369000 |
Adaptive frequency detector of phase locked loop
An adaptive frequency detector used in a phase locked loop for detecting a frequency difference between an input signal and an output clock generated from an oscillator of the phase locked loop...
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7359304 |
Method for recording wobble signals on an optical disc and optical disc on which the wobble signals are recorded
After pre-coding bit data of address information to be recorded on an optical disc on the basis of at least 4 wobble units, wobble data pre-coded on at least 4 wobble units is modulated by a BPSK...
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7358470 |
Optical pickup
An optical pickup with a reflective coating device is provided, including a laser diode (LD), an optical element, and a photo detector integrated circuit (PDIC). The LD emits 1-3 lights with...
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7349305 |
Wobble signal reproducing device and method
A wobble signal reproducing device and method. The wobble signal reproducing device may include a computation unit for outputting a push-pull signal by use of a signal picked up by wobbling an...
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7327647 |
Method and apparatus for generating the wobble clock signal
A method for generating a wobble clock signal. When the wobble signal becomes deformed or a defect on the optical disc is found, the present invention provides a stable wobble clock signal, which...
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7321639 |
Demodulator and address information extractor
In a demodulator for demodulating a BPSK modulated signal, demodulation performance degradation caused by analog circuits such as fabrication variation is suppressed, and furthermore, frequency...
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7317667 |
Wobble signal extraction circuit and optical disk device
A wobble signal extraction circuit for extracting a wobble signal from a first optical disk signal containing a wobble signal component caused by a wobble formed on a surface of an optical disk and...
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7310296 |
Method for decoding address in pre-groove data of an optical disc drive
A method for optical drive decoding of address in pre-groove (ADIP) data is provided to decode an input wobble signal to an ADIP unit signal. The method includes generating a wobble carrier...
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7286447 |
Recording and/or reproducing apparatus and method of controlling the same
A recording and/or reproducing apparatus and a method of controlling the same. The method of controlling the apparatus for recording information in or reproducing information from a disc having a...
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7274627 |
Record carrier and apparatus for scanning the record carrier
A record carrier has a servo track indicating an information track intended for recording information blocks, which servo track has a variation of a physical parameter, referred to as wobble. The...
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7269107 |
Method of detecting land pre-pit signal and optical disc player
The method of the present invention is capable of securely detecting LPP signals. The method comprises the steps of: reading a push-pull signal including a wobble component and LPP components; and...
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7251202 |
Substrate for optical recording medium, optical recording medium, master disc, master disc recording apparatus, and signal generating apparatus
A substrate for an optical recording medium includes recording tracks formed in guide grooves on a disc and an address section having an address pit sequence formed between the recording tracks in...
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7236433 |
System and method of recording and reproducing information
A method and apparatus for recording information by irradiating light onto a medium to form a recorded domain, and method and apparatus for reproducing the recorded information are provided. In one...
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7229743 |
Electron beam lithography method, patterned master carrier for magnetic transfer, lithography method for patterned master carrier for magnetic transfer, and method for producing performatted magnetic recording media
A fine pattern having first elements within track widths and second elements, which are shifted half a track pitch from the first elements, are drawn across the entire surface of a disk accurately...
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7218584 |
Information recording and reproducing apparatus
An information recording and reproducing apparatus performs information recording and reproducing on an optical disc having a recording track wobbled by a predetermined frequency. The apparatus...
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7212486 |
Optical disk device setting a gain of an amplifier so that a peak value and a bottom value of wobble signal components coincide
In this optical disk device, a reflected light of a light beam reflected from a pre-pit-formed side of a track wobbled on a disk is detected as a first detection signal. A reflected light of the...
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7193936 |
Wobble information detection method and wobble information detection apparatus for optical recording medium
A method and apparatus for detecting information recorded as a phase-modulated wobble along a track of an optical disk, whereby a reference phase section is recorded with wobble having a...
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7190663 |
Optical recording medium, information reproduction apparatus, and information recording/reproduction apparatus
User data recording areas and intermediate areas are alternately arranged on a disk. The intermediate area records at least information for synchronization.
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RE39513 |
Demodulation circuit for demodulating wobbling signal
A device for demodulating position information that is recorded as track wobbling in a record medium by a BPSK scheme includes a carrier-wave-generation circuit which derives a carrier wave from a...
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7180839 |
Recording medium having wobbled groove tracks out of phase with wobbled land tracks, servo controlling apparatus using wobble signal and method thereof
A recording medium having wobbled groove tracks out of phase with wobbled land tracks, a servo controlling apparatus using a wobble signal and a method thereof. The recording medium has land tracks...
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7151719 |
Method for reducing the noise in a wobble signal
The present invention relates to a method and a circuit for recovering information contained in a wobble track of an optical storage medium. One aim of the invention is to describe a method within...
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7149170 |
Method for decoding address in pre-groove data of an optical disc drive
A method for optical drive decoding of address in pre-groove (ADIP) data is provided to decode an input wobble signal to an ADIP unit signal. The method includes generating a wobble carrier...
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7141356 |
Electron beam lithography method
Deflecting means, for deflecting an electron beam in a radial direction and the circumferential direction, and blanking means, for shielding irradiation of the electron beam at portions other than...
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7139236 |
Information recording medium having substrate with microscopic pattern and reproducing apparatus therefor
A recording medium includes a substrate having a microscopic pattern, which includes a shape of continuous substance of approximately parallel grooves formed with a convex shaped section and a...
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7133331 |
Recording medium having a substrate containing microscopic pattern of parallel groove and land sections and recording/reproducing equipment therefor
An information recording medium 1 at least comprises a substrate 13 having a microscopic pattern 20 , which is constituted by a shape of continuous substance of approximately parallel grooves...
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7123559 |
Optical disc having uniform structure
An optical disc is manufactured under a uniform condition by forming grooves and lands on the entire surface of the disc. The optical disc is configured to obtain a reliable reproduction signal,...
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7123552 |
Wobble signal detecting circuit for optical disc system
A wobble signal detecting circuit for optical disc system includes at least a sample-and-hold circuit for carrying out sample-holding steps on each of first and second photoelectric signals, and a...
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7110347 |
Information recording medium
A recording medium is provided, which maximizes the recording capacity and simplifies the configuration of an information recording/reproducing apparatus including a pickup. In the medium,...
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7106669 |
Information recording method
A reproducing apparatus for reproducing information recorded on an optical recording medium including a disk-like substrate, a plurality of tracks extending in a circumferential direction on the...
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7099244 |
Wobble demodulator and wobble demodulation method
A wobble demodulator for reproducing digital information from an optical recording medium in which a track is formed in accordance with a wobble signal that is MSK-modulated so as to contain the...
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7095681 |
Apparatus and method for detecting wobble signal read from optical disc
An apparatus and method for detecting a wobble signal read from an optical disc. The wobble signal detection apparatus comprises an analog/digital (A/D) converter for A/D-converting an analog...
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7092330 |
Information recording method
A reproducing apparatus for reproducing information recorded on an optical recording medium including a disk-like substrate, a spiral or concentric-shaped groove structure along a track formed on...
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7092329 |
Physical identification data addressing method using wobble signal, wobble address encoding circuit, method and circuit for detecting wobble address, and recording medium therefor
A physical identification data (PID) addressing method using a wobble signal, a wobble address encoding circuit, a method and circuit for detecting the wobble address and a recording medium...
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7088653 |
Information recording method
A recording method for an optical medium including a disk-like substrate, a spiral or concentric-shaped groove structure along tracks formed on the substrate, each of the tracks being divided into...
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7085221 |
Optical disc
An optical disc includes a read-only area having a first wobble, which is a data wobble formed in the read-only area for only reading, a readable/writable area having a second wobble, which is...
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7085202 |
Information recording method
A recording method for an optical medium having a disk-like substrate with a spiral or concentric-shaped groove structure along a track formed on the substrate. The groove structure is wobbled in a...
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7082096 |
Information recording method
A recording method for an optical medium having a disk-like substrate, a plurality of tracks extending in a circumferential direction on the substrate and associated with a plurality of grooves,...
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7068585 |
Optical information recording medium
In a DVD-R, lands 1 and grooves 2 are alternately formed in a spiral configuration; the lands 1 form projecting parts, and the grooves 2 form recessed parts 2 . Recorded information is...
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7050363 |
Optical disk device
An optical disk device for writing data onto an optical disk having a wobble track comprises an optical pickup for irradiating laser light of a writing power and laser light of a replaying power...
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7046598 |
Apparatus for and method of detecting phase difference between phase reference signal and wobble
An apparatus which records/reproduces data with respect to an optical recording medium, includes a data processing unit which detects a phase difference between a phase reference signal and a...
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7012396 |
Increased digital spindle motor control resolution through dither
A motor controller provides pulse width modulated drive signals to a motor. A digital demand code for controlling motor speed is input to the motor controller. A dither generator generates a...
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6980494 |
Optical disc recording method and apparatus, optical disc, and optical disc reproducing apparatus
An optical disc recording method, an optical disc recording apparatus, and an optical disc in which performances of the optical disc is maintained over a long period of time without generating...
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6963521 |
Disc drive apparatus
Disclosed herein is a disc drive apparatus for recording and reproducing data to and from an optical disc-like storage medium. The apparatus includes a wobble signal generating element for...
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6937542 |
Recording device and method of detecting tracking error signal and wobble signal of a wobbled track of an optical disk
In an optical disk recording device for projecting a recording light beam onto an optical disk to form 3T-11T pits in a land of the optical disk, timing to sample and hold a reflected light...
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6930961 |
Grooving apparatus and grooving method
Disclosed is a grooving apparatus which can carry information on an information track at high recording density when carrying the information on the information track through a change in shape of a...
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6914856 |
Information recording medium
A recording medium that is adapted to maximize the recording capacity and to simplify the configuration of an information recording/reproducing apparatus including a pickup. In the medium, a...
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6912185 |
Optical disc and optical disc address reading apparatus and method
An optical disc having marks for dispersed addresses that can be easily detected with high precision. A dispersed address comprises synchronization marks, positive marks, and negative marks....
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6885622 |
Track offset compensation in optical disk drives using beat-inducing signals
A method for compensating track offset in an optical disk drive is provided, which achieves complete compensation of the track offset and than reduces the compensation time for the track offset....
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6873595 |
Information recording medium having parallel grooves with alternating convex-concave sections
An information recording medium includes a substrate having a microscopic pattern which has a shape of continous substance of approximately parallel grooves formed with a convex shaped section and...
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6850477 |
Optical disc and apparatus for scanning the optical disc
An optical disc is described for recording data, which disc has a recording area for recording data encoded in optical marks at a recording density. The recording area has circular or spiral tracks...
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