Patent application number | Description | Published |
20090034114 | Magnetic disk drive with head retraction control - Embodiments of the invention improve utility of a magnetic disk drive in which a head is retracted if the magnetic disk drive is in a dropping state. In one embodiment, an HDC/MPU provided in a magnetic disk drive judges whether the magnetic disk drive is in a dropping state based on an output from an acceleration sensor which may detect an acceleration and performs a retraction operation of a head. After the HDC/MPU judges that a drop is occurring, the HDC/MPU detects whether the drop judgment is incorrect according to whether a shock sensor detects a shock occurrence and changes the drop judgment condition based on a detection history of detected incorrect judgments. | 02-05-2009 |
20090141391 | Disk drive device and clearance control method thereof - Embodiments of the present invention help to precisely control the clearance between a head and disk for the pressure without using a barometric sensor. In an embodiment of the present invention, an HDD determines a clearance from variations in operational parameters, and further determines a variation in pressure by deducting the clearance variation caused by a variation in temperature from the clearance. When the HDD controls the clearance in accordance with the pressure change, the HDD checks for head-disk contact. The accuracy and reliability in pressure measurement (clearance measurement) using operational parameters are not high. Therefore, confirming the pressure measurement by the presence or absence of head-disk contact eliminates head-disk contact in the following read/write operation to attain a securer margin for the clearance. | 06-04-2009 |
20090201598 | Disc drive device - Embodiments of the present invention precisely measure clearance variation by temperature change using a value in a RW channel. In an embodiment of the present invention, an HDD measures resolution by signals in a RW channel. The measured resolution shows variations depending on temperature according to two factors. One factor is the clearance variation depending on the temperature and the other is the variation in operational property of the RW channel depending on the temperature. The HDD compensates for the temperature variation of the resolution according to the two factors. The HDD uses two kinds of sensed temperature. One corresponds to the temperature inside an enclosure in which head sliders are provided and the other corresponds to the temperature of the chip in which the RW channel is implemented. Sensing the drive temperature and the channel temperature independently achieves precise compensation for the variation in the measured resolution caused by clearance variation and channel property. | 08-13-2009 |
20090296260 | Device and method for specifying control value for controlling clearance between head and disk, and magnetic disk drive device - Embodiments of the present invention help to detect contact between a head and a magnetic disk more accurately in specifying a heater power value for adjusting a clearance between a head element portion and the disk. According to one embodiment, a hard disk controller/multiprocessing unit (HDC/MPU) measures amplitudes of read signals in a user data field DATA. A hard disk drive (HDD) fills a gap between servo data with single data sector. The HDC/MPU measures the amplitudes of read signals in each data sector at different heater power values. It determines the heater power value at which contact occurs from the measured values. | 12-03-2009 |
20100128383 | DISK DRIVE AND METHOD FOR CONTROLLING CLEARANCE IN THE DISK DRIVE - A disk drive. The disk drive includes a disk configured to store data, a slider configured to fly in proximity to the disk, and a magnetic-recording head on the slider configured to access the disk. The disk drive also includes a moving mechanism configured to support and to move the head-slider, an adjustment portion configured to adjust clearance between the magnetic-recording head and the disk, and a controller configured to control the adjustment portion to control the clearance. The controller is configured to perform clearance control in a first mode in an operation selected from the group consisting of reading user data and writing user data according to a change in fly height of the slider after a load operation, and subsequently is configured to perform clearance control in a second mode in an operation selected from the group consisting of reading user data and writing user data. | 05-27-2010 |
20110007416 | DISK DRIVE AND METHOD FOR MEASURING CLEARANCE BETWEEN A HEAD AND A DISK IN A DISK DRIVE - A disk drive. The disk drive includes a disk, a head, a head-slider, a moving mechanism, and a controller. The head is configured to access the disk. The head-slider includes the head, and is configured to fly in proximity to a recording surface of the disk. The moving mechanism is configured to move the head-slider over the disk, and to support the head-slider. The controller is configured to read out at least one from a plurality of clearance-measurement data strings from the recording surface of the disk using the head, and to calculate a clearance between the head and the disk from clearance-measurement results obtained from a plurality of resolutions with different frequency components. | 01-13-2011 |
20110102933 | DISK DRIVE AND METHOD FOR MEASURING CLEARANCE CHANGE IN THE DISK DRIVE - A method for measuring a change of a clearance between a head and a disk. The method includes reading a preliminarily written data string for clearance measurement on a disk to obtain a first measured value corresponding to a clearance, and writing a new data string for deterioration check onto the disk and reading the data string for deterioration check to obtain a second measured value corresponding to the clearance. The method also includes determining a deterioration of the data string for clearance measurement from a difference between the first measured value and the second measured value, measuring a clearance change using the data string for clearance measurement by a normal operation if the determination is that the data string for clearance measurement has not deteriorated, and measuring a clearance change by an operation different operation if the determination is that the data string for clearance measurement has deteriorated. | 05-05-2011 |
Patent application number | Description | Published |
20090095631 | METHOD FOR SEPARATING ACTIVE MATERIAL OF ELECTRODE PLATE FOR STORAGE BATTERY - An electrode plate ( | 04-16-2009 |
20100193465 | SEPARATING METHOD FOR CONDUCTIVE CERAMICS SINTERED BODY - There are provided an aqueous solution for separation of a conductive ceramics sintered body in which a conductive ceramic sintered body separated form a glass can be collected in a recyclable condition, and a separating method therefor, and an aqueous solution for separation with which a dark ceramics sintered body, a conductive ceramics sintered body and a glass are separately collected from a glass with a dark ceramics sintered body in which a conductive ceramics sintered body is formed on the dark ceramics sintered body, and a separating method therefor. A treatment liquid having an etching ability for at least one of a glass and a conductive ceramic sintered body is prepared as an aqueous solution | 08-05-2010 |
20100206005 | Interlayer Film Separation Solution and Interlayer Film Separation Method - There are provided an interlayer film separation solution and an interlayer film separation method capable of separating an interlayer film and a glass for a short period of time and collecting the separated interlayer film in a recyclable condition. An interlayer film separation solution | 08-19-2010 |
20100227752 | SEPARATING METHOD FOR DARK CERAMICS SINTERED BODY - There are provided an aqueous solution for separation of a dark ceramics sintered body, which can easily collect in a recyclable condition a glass from a glass with a dark ceramics sintered body, and a separating method therefor, and an aqueous solution for separation with which a dark ceramics sintered body, a conductive ceramics sintered body and a glass are separately collected from a glass with a dark ceramics sintered body formed with the dark ceramics sintered body and the conductive ceramics sintered body, and a separating method therefor. A treatment liquid (hydrofluoric acid, a mixture of ammonium fluoride and an acid, etc.) having an etching ability for at least one of a glass and a dark ceramic sintered body is prepared as an aqueous solution | 09-09-2010 |
20120125371 | METHOD OF RECYCLING WASTE FLUORESCENT LAMP - A method of recycling a waste fluorescent lamp which has a glass tube that keeps a vacuum state in its inside including (a) creating a hole in an edge of the glass tube and fulfilling a peeling liquid into the glass tube via the hole using a negative pressure constructed inside the glass tube; (b) peeling off layers formed inside the glass tube via the peeling liquid; and (c) creating another hole in an other edge of the glass tube and discharging the peeled layers and the peeling liquid via either or both of the holes. | 05-24-2012 |