Patent application number | Description | Published |
20090284862 | HEAD POSITION CONTROL METHOD, HEAD POSITION CONTROL DEVICE, AND MAGNETIC RECORDING EVALUATION APPARATUS - A magnetic head position control method is provided to control a magnetic head to follow the track on a DTM disk by accurately detecting the eccentricity compensation amount through a simple process. An angle detection unit detects θ | 11-19-2009 |
20100033862 | Inspection Apparatus and Inspection Method of Magnetic Disk or Magnetic Head - The present invention provides a technique for converting burst data to digital data, applying FFT operation to 2 | 02-11-2010 |
20100067135 | Inspection Apparatus and Inspection Method of Magnetic Disk or Magnetic Head - The present invention is designed to support plural servo patterns by setting a portion of the information of the servo pattern as a detection pattern, comparing the demodulated pattern of the portion of the information with the detection pattern, and controlling an operation timing of a test according to a result of the comparison. | 03-18-2010 |
20100079900 | MAGNETIC HEAD-POSITIONING SERVO SYSTEM, MAGNETIC HEAD TEST SYSTEM AND MAGNETIC DISK TEST SYSTEM - A magnetic head-positioning servo system is provided to accurately test a magnetic disk with a track written in advance, by providing two fine actuators. The second fine actuator, to which a magnetic head is attached, is mounted on the first fine actuator. The second fine actuator has a larger generating displacement than a generating displacement of the first fine actuator, and lets the magnetic disk to follow the eccentricity of the track. In this way, the positioning accuracy can be increased. | 04-01-2010 |
20110090590 | HEAD POSITION CONTROL DEVICE, MAGNETIC RECORDING EVALUATION APPARATUS, AND HEAD POSITION CONTROL METHOD - At time to start learning feed-forward control and under the status that servo-drive is not put in execution, a positioning error of repeatable runout is detected by means of a positioning error of repeatable runout operation section and on the basis of a value of the positioning error of repeatable runout, a drive pattern and drive interval of idling are determined by means of a feed-forward data operation section. The drive pattern is stored in a feed-forward data memory and is outputted as feed-forward data in synchronism with the rotation of a spindle during drive interval, thus performing idling of a fine-movement actuator. After the idling has ended, control initiation sequence is resumed to carry out learning of feed-forward control. | 04-21-2011 |
20110211277 | DETECTING CIRCUIT AND INSPECTING APPARATUS - A detecting circuit, which can detect plural types of servo signals, including a cosine/sine value detector for sampling a servo signal supplied from an inspected object and thereby obtaining a cosine value and a sine value, an amplitude/phase detector for obtaining at least amplitude information and phase information on the basis of the cosine value and the sine value obtained by the cosine/sine value detector, and a servo selector/position detector for selecting a servo scheme of the inspected object and detecting a position of the inspected object on the basis of the amplitude information and the phase information obtained by the amplitude/phase detector. | 09-01-2011 |
20120194939 | PATTERNED MEDIUM INSPECTION METHOD AND INSPECTION APPARATUS - A patterned medium inspection method according to the present invention includes a timing computation process including a read process reading the reproduced signal of a patterned medium under inspection and a computation process computing the signal interval values from the patterned medium reproduced signal read in the read process, and a judgment process judging the quality of the patterned medium using the reproduced signal interval values computed in the computation process. | 08-02-2012 |
Patent application number | Description | Published |
20100020427 | METHOD FOR MEASURING OFFSET AMOUNT BETWEEN HEADS IN A COMPOSITE MAGNETIC HEAD AND A MEASURING DEVICE USING THE METHOD - An offset amount between heads is calculated by positioning a head in a designated track under an ON track servo control, obliquely writing test data by moving the head in a radial direction of the magnetic recording medium at a designated moving speed K to cross the designated track and at least one track adjacent to the designated track according to a write start signal, reading the oblique test data by the read head from the adjacent track under the ON track servo control, detecting a peak position of a read voltage by using a read voltage characteristics of the read signal in the adjacent track and calculating the offset amount between the heads by detecting a scan time up to the peak position of the read voltage. | 01-28-2010 |
20100020428 | METHOD FOR MEASURING WRITE/READ WIDTH OF A COMPOSITE MAGNETIC HEAD AND A MEASURING DEVICE USING THE METHOD - A test data is written in tracks of a DTM by making the tracks eccentric by accessing a plurality of tracks by forcibly making a composite magnetic head eccentric under an ON track servo control. The test data written in the tracks which are pseudo-eccentric are written in the tracks with the original write sensitive width of a write head. It is possible to obtain a read characteristics profile having a peak by tracing and reading the test data while moving the composite magnetic head (read head) which is forcibly made eccentric in a radial direction. | 01-28-2010 |
20100195244 | SERVO AREA TEST METHOD OF A MAGNETIC RECORDING MEDIUM AND A TEST DEVICE - A read signal for one revolution of each of a plurality of tracks jitter of which is cancelled is obtained and a binary-coded image data for the read signal is generated and the track number position of each servo area is specified from the binary-coded image data. Further, a read signal in this position in radial direction is obtained from the track number position of each of the specified servo areas and the servo area is tested by the read signal. | 08-05-2010 |
20100214686 | HEAD POSITIONING METHOD FOR ECCENTRIC TRACK AND HEAD POSITIONING CONTROL DEVICE - Drive waveforms with which extension and contraction characteristics of an actuator corresponding to a number of track eccentricity amounts are stored as data. By reading servo information written in a disk is obtained as a signal indicating a head displacement amount from a track. The head is moved in a direction in which the track is displaced by obtaining an amplitude corresponding to a slip amount of the head position and a rotation angle of maximum eccentricity, reading drive waveforms which is optimal in driving the actuator from the memory and driving the actuator with a drive waveform matched with the rotation angle at which the eccentricity is maximum. | 08-26-2010 |
Patent application number | Description | Published |
20090109358 | DISPLAY APPARATUS - Disclosed herein is a display apparatus including a first substrate patterned to create pixel electrodes, a second substrate placed to face the first substrate and a liquid-crystal layer sandwiched by the first and second substrates wherein: one of the first and second substrates is patterned to create color filters each provided for one of a plurality of different colors as color filters each associated with one of the pixel electrodes each included in one of pixels each provided for one of the different colors; each of the pixels each provided for one of the different colors has a pixel area which varies from color to color; and the ratio of the electrode area of any particular one of the pixel electrodes to the pixel area of the pixel that includes the particular pixel electrode varies from color to color. | 04-30-2009 |
20090296037 | DISPLAY DEVICE - A display device is provided and includes pixel electrodes, each of the pixel electrodes including a plurality of electrode sections which are arranged parallel to each other. Each electrode section is bent approximately in the middle along its extension direction in plan view. The pixel electrodes include a center connection portion adapted to connect together the electrode sections at their bent portions, and include end connection portions adapted to connect together the electrode sections at their end portions, and include protruding portions each of which is formed by extending the end connection portion in such a manner as to protrude from the arranged electrode sections. The display device also includes a substrate on which the pixel electrodes are arranged, an opposed substrate provided to face the side of the substrate on which the pixel electrodes are formed, and a liquid crystal layer filled and sealed between the substrate and opposed substrate. | 12-03-2009 |
20100157221 | LIQUID CRYSTAL PANEL AND ELECTRONIC APPARATUS - A liquid crystal panel includes: first and second substrates arranged to be opposite each other at a predetermined gap; a liquid crystal layer filled between the first and second substrates; a counter electrode pattern formed on the first substrate; a pixel electrode pattern formed on the first substrate; and alignment films formed such that the alignment direction of the liquid crystal layer crosses the extension direction of a slit of the pixel electrode pattern at an angle of 7° or larger. | 06-24-2010 |
20100157226 | LIQUID CRYSTAL PANEL AND ELECTRONIC APPARATUS - A liquid crystal panel includes: first and second substrates arranged to be opposite each other at a predetermined gap; a liquid crystal layer filled between the first and second substrates; alignment films; a counter electrode pattern formed on the first substrate; and a pixel electrode pattern formed on the first substrate so as to have a plurality of electrode branches, the pixel electrode pattern having a partial connection branch formed around a contact so as to transversely connect a plurality of electrode branches extending from the contact from among the plurality of electrode branches. | 06-24-2010 |
20100157228 | LIQUID CRYSTAL PANEL AND ELECTRONIC APPARATUS - A liquid crystal panel includes: first and second substrates arranged to be opposite each other at a predetermined gap; a liquid crystal layer filled between the first and second substrates; alignment films; a counter electrode pattern formed on the first substrate; and a pixel electrode pattern formed on the first substrate so as to have a plurality of electrode branches, the extension direction of which is bent at one bend point provided near an upper pixel portion from the center of a pixel region, and which are connected at the end portion of at least the upper pixel portion or lower pixel portion, wherein the extension direction of a slit formed near the upper pixel portion from the bend point from among slits formed in the pixel electrode pattern crosses the alignment direction of the liquid crystal layer at an angle of 7° or larger. | 06-24-2010 |
20100157229 | LIQUID CRYSTAL PANEL AND ELECTRONIC APPARATUS - A liquid crystal panel includes: first and second substrates arranged to be opposite each other at a predetermined gap; a liquid crystal layer filled between the first and second substrates; alignment films; a counter electrode pattern formed on the first substrate; and a pixel electrode pattern formed on the first substrate so as to have a plurality of electrode branches, wherein the extension direction of at least one of slits formed at both ends from among slits formed between the plurality of electrode branches crosses the alignment direction of the liquid crystal layer at an angle of 7° or larger. | 06-24-2010 |
20120194776 | DISPLAY DEVICE - A display device is provided and includes pixel electrodes, each including a plurality of electrode sections which are arranged parallel to each other. Each electrode section is bent approximately in the middle along its extension direction in plan view. The pixel electrodes include a center connection portion adapted to connect together the electrode sections at their bent portions, and include end connection portions adapted to connect together the electrode sections at their end portions, and include protruding portions each of which is formed by extending the end connection portion in such a manner as to protrude from the arranged electrode sections. The display device also includes a substrate on which the pixel electrodes are arranged, an opposed substrate provided to face the side of the substrate on which the pixel electrodes are formed, and a liquid crystal layer filled and sealed between the substrate and opposed substrate. | 08-02-2012 |
20140232973 | LIQUID CRYSTAL PANEL AND ELECTRONIC APPARATUS - A liquid crystal panel includes: first and second substrates arranged to be opposite each other at a predetermined gap; a liquid crystal layer filled between the first and second substrates; alignment films; a counter electrode pattern formed on the first substrate; and a pixel electrode pattern formed on the first substrate so as to have a plurality of electrode branches, the extension direction of which is bent at one bend point provided near an upper pixel portion from the center of a pixel region, and which are connected at the end portion of at least the upper pixel portion or lower pixel portion, wherein the extension direction of a slit formed near the upper pixel portion from the bend point from among slits formed in the pixel electrode pattern crosses the alignment direction of the liquid crystal layer at an angle of 7° or larger. | 08-21-2014 |
Patent application number | Description | Published |
20120057255 | INSPECTION DEVICE OR INSPECTION METHOD FOR MAGNETIC HEAD OR MAGNETIC DISC, AND MAGNETIC DISC RECORDING DEVICE AND MAGNETIC DISC RECORDING METHOD - An inspection device or inspection method for a magnetic head or magnetic disc which can form a servo pattern applicable to a write system, and a magnetic disc recording device or magnetic disc recording method. In inspection or recording of a magnetic disc, which rotates the magnetic disc, a servo pattern is written into a servo pattern region of the magnetic disc by a write-in element of a magnetic head, and is read by a read-in element of the magnetic head. Servo following of a position of the magnetic head on the magnetic disc is performed based on the servo pattern which comprises a plurality of patterns. The patterns are written-in with a first frequency for causing the patterns to be subjected to the servo following and, the patterns are overwritten with a second frequency different from the first frequency, except a servo following width used in the servo following. | 03-08-2012 |
20120075738 | INSPECTION APPARATUS AND INSPECTION METHOD FOR MAGNETIC HEAD OR MAGNETIC DISK AND INSPECTION METHOD FOR MAGNETIC HEAD - An inspection apparatus and method for a magnetic head or a magnetic disk is conducted using a two-carriage method. In particular, the magnetic disk is rotated by a spindle, a test signal is written into the magnetic disk by one magnetic head mounted in one carriage which moves in the radius direction of the magnetic disk, and the test signal of the magnetic disk is read by the other magnetic head mounted in the other carriage which moves in the radius direction of the magnetic disk to inspect the performance of the magnetic head or the magnetic disk using the read signal. The sector pulses to determine servo timing at which servo burst signals preliminarily written into the disk are read are formed on the basis of a clock signal and an index signal generated along with the rotation of the spindle. | 03-29-2012 |
20120250175 | INSPECTION DEVICE AND INSPECTION METHOD FOR INSPECTING MAGNETIC DISK OR MAGNETIC HEAD - The present invention realizes reduction of position information demodulation errors caused by the eccentricity of the magnetic disk and improvement of position signal detection accuracy, as well as enabling quick eccentricity clock correction for arbitrary clock frequencies. An inspection device in accordance with the present invention comprises: a servo demodulation unit which demodulates servo information; a PLL clock generating unit which generates a reference clock and supplies the reference clock to the servo demodulation unit; and a tester control unit. The PLL clock generating unit includes an eccentricity correction circuit for correcting the frequency of the reference clock depending on the eccentricity of the magnetic disk. The tester control unit generates correction data for correcting the frequency of the reference clock, multiplies the correction data by the inverse of a transfer function of the PLL clock generating unit, and supplies the product to the eccentricity correction circuit. | 10-04-2012 |