Showing papers on "Magnetic tape published in 2017"

Magnetic tape and magnetic tape device

Abstract: The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm 3 , and an edge shape of the timing-based servo pattern specified by a magnetic force microscope observation is a shape in which a difference (l 99.9 −l 0.1 ) between a value l 99.9 of a cumulative frequency function of 99.9% of a position deviation width from an ideal shape in a longitudinal direction of the magnetic tape and a value l 0.1 of the cumulative frequency function of 0.1% thereof is equal to or smaller than 180 nm.

Magnetic tape, magnetic tape cartridge, and magnetic recording and reproducing device

Abstract: The magnetic tape includes a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support, and a magnetic layer containing ferromagnetic powder, abrasive, and binder on the nonmagnetic layer, wherein a thickness of the nonmagnetic layer is less than or equal to 0.50 μm, a coefficient of friction as measured on a base portion of a surface of the magnetic layer is less than or equal to 0.35, and ΔSFD in a longitudinal direction of the magnetic tape as calculated with Equation 1, ΔSFD=SFD25° C.−SFD−190° C., is greater than or equal to 0.50, wherein, in Equation 1, SFD25° C. denotes a SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of 25° C., and SFD−190° C. denotes a SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of −190° C.

Product Codes for Data Storage on Magnetic Tape

Abstract: For 2-D product codes used in tape storage, the mapping of error-correction-coding (ECC) blocks (EBs) into 2-D physical blocks (PBs) on magnetic tape is generalized. The 3-D product codes that have the same code rate and EB size as interleaved 2-D product codes currently used in tape storage are proposed. For 3-D product codes, a new family of mappings of EBs into 2-D PBs on magnetic tape is introduced, which fulfills the stringent burst-error-correction requirements of tape storage. The burst-error-correction capability of 2-D and 3-D product code words recorded on magnetic tape is analyzed as a function of track rotation, linear density, and ECC parameters. The performance limits of the tape-storage channel are determined based on computations of channel capacity and random coding bound. Hardware simulations of iterative hard-decision decoding of product codes implemented in a field-programmable gate array demonstrate the improved error-rate performance of 3-D product codes over 2-D product codes.

Magnetic Field Sensing Based on Bi-Tapered Optical Fibers Using Spectral Phase Analysis

Abstract: A compact, magnetic field sensor system based on a short, bi-tapered optical fiber (BTOF) span lying on a magnetic tape was designed, fabricated, and characterized. We monitored the transmission spectrum from a broadband light source, which displayed a strong interference signal. After data collection, we applied a phase analysis of the interference optical spectrum. We here report the results on two fabricated, BTOFs with different interference spectrum characteristics; we analyzed the signal based on the interference between a high-order modal component and the core fiber mode. The sensor exhibited a linear response for magnetic field increments, and we achieved a phase sensitivity of around 0.28 rad/mT. The sensing setup presented remote sensing operation and low-cost transducer magnetic material.

Magnetic tape having controlled surface properties of the back coating layer and magnetic layer

Abstract: A magnetic tape is provided in which the center line average surface roughness Ra measured regarding the surface of the magnetic layer is less than or equal to 1.8 nm, and the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is less than or equal to 0.050. A back coating layer includes one or more components selected from a fatty acid and a fatty acid amide. In addition, the C—H derived C concentration calculated from the C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed regarding the surface of the back coating layer at a photoelectron take-off angle of 10 degrees is greater than or equal to 35 atom %.

Magnetic tape device with TMR head and specific logarithmic decrement and magnetic reproducing method

Abstract: The magnetic tape device includes: a magnetic tape; and a reproducing head, in which the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, and logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.

Magnetic tape having characterized magnetic layer and magnetic tape device

Abstract: The magnetic tape includes: a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic layer, in which a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer has a servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and a magnetic tape device including this magnetic tape.

Magnetic tape having controlled surface properties of the magnetic layer

Abstract: A magnetic tape includes a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer. The total thickness of the non-magnetic layer and the magnetic layer is less than or equal to 0.60 μm. The magnetic layer includes a timing-based servo pattern, and the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is less than or equal to 0.050.

Hybrid servo pattern configurations for magnetic tape

Abstract: A tape drive-implemented method, according to one embodiment, includes: determining a servo band configuration of servo bands on a magnetic tape, using servo readers on a magnetic tape head to read one or more of the servo bands based on the determined servo band configuration, and using information read from the one or more of the servo bands to position the magnetic tape head relative to the magnetic tape. An array of data transducers is positioned along the magnetic tape head, the array extending perpendicular to a direction of travel of the magnetic tape. Moreover, a group of the servo readers is positioned at each end of the array of data transducers, and a distance between each of the immediately adjacent servo readers in each of the groups of servo readers is less than or equal to one third of a prespecified width of each of the servo bands.

Magnetic tape including characterized magnetic layer

Abstract: A magnetic tape is provided having a total thickness of the non-magnetic and magnetic layers of less than or equal to 0.60 μm. The C—H derived C concentration calculated from the C—H peak area ratio of C1s spectra by ESCA on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is greater than or equal to 45 atom %. The full widths at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer before and after vacuum heating with respect to the magnetic tape are respectively greater than 0 nm and less than or equal to 7.0 nm, and the difference between a spacing measured after the vacuum heating and a spacing measured before the vacuum heating is greater than 0 nm and less than or equal to 8.0 nm.

Magnetic tape device with magnetic tape having particular C-H derived C concentration and magnetic reproducing method

Abstract: The magnetic tape device includes: a magnetic tape; and a reproducing head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %.

Magnetic tape device and magnetic tape maintenance method

Abstract: A magnetic tape device includes a magnetic tape as a storage medium; a travel unit that moves the magnetic tape along a travel route; a magnetic head that is arranged at the travel route and performs data reading and writing for the magnetic tape that moves on the travel route; and a lifter unit that is arranged at the travel route and contacts the magnetic tape which is stopped on the travel route, where the lifter unit is able to reciprocate in a direction that intersects the travel route so as to separate the magnetic tape from the magnetic head.

Elevator car position detection device

Abstract: The invention provides an elevator car position detection device, and relates to the technical field of elevators. The elevator car is located in an elevator well; the detection device comprises a magnetic tape arranged in the elevator well along a vertical direction, a magnetic head for reading and writing information of the magnetic tape and a main controller electrically connected with the magnetic head; one end of the magnetic tape is fixed at the top end of the elevator well, and a balancing weight is arranged at the other end of the magnetic tape; the balancing weight is located at the bottom end of the elevator well; the magnetic head is fixed on the elevator car; the horizontal position of the magnetic head and the magnetic tape is fixed; the magnetic head performs reciprocating motion in the vertical direction in the elevator well along with the elevator car; the magnetic head reads the information of the magnetic tape and transmits the information to the main controller; and the main controller transmits elevator car position information to an elevator control system. According to the elevator car position detection device, the absolute position of the elevator car in the elevator well can also be rapidly and accurately obtained, the elevator does not need to calibrate the position information at a designated position, the detection technology of the position of the elevator car is simplified, the detection precision is high, and the detection cost is reduced.

Propeller type synchronous power generating and vibration suppression device and method with piezoelectric panel

Abstract: The invention relates to a propeller type synchronous power generating and vibration suppression device and method with piezoelectric panel. The device comprises a rotating module and a conductive module. The conductive module comprises a spiral coil, a conductive ring coil, a ring coil fixing plate, a fixed plate upper clamp, a fixing plate lower clamp, connecting conductors, output conductors and a coil sleeve. The rotating module comprises a blade outer sleeve, a rotating bearing, an embedded magnetic tape blade, a piezoelectric panel, piezoelectric panel conductors and a rotating clamping hole. The rotating module rotates around a vertical pipe under the flushing of sea waves to achieve the cutting of magnetic induction lines and the deformation of the piezoelectric panel simultaneously to generate electric current. At the same time, when the embedded magnetic tape blade and the piezoelectric panel rotate, the flow field surrounding the vertical pipe is undermined, the separation of boundary layers and the generation of vortexes are interfered, therefore the vortex induced vibration is inhibited, the device and method hit two birds with one stone.

Magnetic tape and manufacturing method of the same

Abstract: PROBLEM TO BE SOLVED: To provide a magnetic tape capable of exhibiting excellent electromagnetic conversion characteristics and suppressing the occurrence of bonding of a magnetic tape surface and a head during repeated running and the occurrence of scratches on the magnetic tape surface and attachment onto the head, and provide a manufacturing method of the magnetic tape.SOLUTION: The magnetic tape is characterized that: center line average surface roughness Ra measured on a magnetic layer side surface of a magnetic tape is 2.8 nm or less; the magnetic layer and a back coat layer include fatty acid ester; a spacing difference measured on the magnetic layer side surface and the back coat layer side surface before and after vacuum heating by an optical interference method are respectively more than 0 nm and 8.0 nm or less; and full widths at half maximum of spacing distribution measured on the back coat layer side surface before and after the vacuum heating of the magnetic tape by an optical interference method is respectively more than 0 nm and 10.0 nm or less.SELECTED DRAWING: None

Multi-curvature circumference path tracking control method based on magnetic tape guidance AGV

Abstract: Provided is a multi-curvature circumference path tracking control method based on a magnetic tape guidance AGV. The method includes establishing the movement relationship between the moving linear speed of AGV left and right driving wheels and the mass center rotation radius of the AGV; analyzing the positional relationship between the AGV, a magnetic guidance sensor and the circumferential path and establishing the geometric relation, selecting the critical signal value (critical angle) to guarantee the linear tracking accuracy of the magnetic tape guidance AGV, and guaranteeing the tracking capability of the magnetic tape guidance AGV on the circumference path in different curvatures by establishing the mapping relationship between the signal value of the magnetic guidance sensor and the deviation distance Si. On the premise of guaranteeing the tracking precision and the rapid reaction ability, the time for the AGV turning can be effectively reduced, and the AGV running efficiency is improved. In addition, the adaptability and flexibility of the AGV to the practical application environment can be improved.

Magnetic tape and magentic tape device

Abstract: The magnetic tape has a timing base servo pattern on the magnetic layer, wherein the centerline average surface roughness Ra on the surface of the magnetic layer is less than or equal to 1.8 nm, the magnetic layer contains a fatty acid ester, the full width at half maximum of spacing distribution measured by optical interferometry on the surface of the magnetic layer before and after vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 7.0 nm, the difference of spacing measured by optical interferometry on the surface of the magnetic layer after and before vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 8.0 nm.

Tunnel valve magnetic tape head for multichannel tape recording

Abstract: An apparatus, according to one embodiment, includes: a tape head having: a write module, a read module, and a plurality of tunnel valve read transducers arranged in an array extending along the read module. Each of the tunnel valve read transducers includes: a sensor structure, an upper and lower magnetic shield, an upper conducting spacer layer between the sensor structure and the upper magnetic shield, a lower conducting spacer layer between the sensor structure and the lower magnetic shield, and electrically insulating layers opposite the sensor structure. The sensor structure includes a cap layer, a free layer, a tunnel barrier layer, a reference layer and antiferromagnetic layer. A height of the free layer measured in a direction perpendicular to a media bearing surface of the read module is less than a width of the free layer measured in a cross-track direction perpendicular to an intended direction of media travel.

Method and device for storage of data backup

Abstract: The invention discloses a method and a device for storage of data backup. The method comprises the following steps of receiving a data backup request; writing the to-be-stored data into an SSD (solid state disc) hard disc, wherein the SSD hard disc is used as an intermediate cache for standby of a magnetic tape library; writing the data written into the SSD hard disc into the magnetic tape library to be stored; when external related backup software initiates a backup strategy, writing data into the end of the magnetic tape library; firstly, writing the data into a virtual magnetic tape library using the SSD hard disc as a carrier, and temporarily storing for a period of time; finally, writing the data on the SSD into a magnetic tape to be stored. The method has the advantages that by utilizing data cache, the magnetic tape library has the high-speed read-write function, the requirement of massive-data and high-concurrency data backup environment under the existing environment is met, the backup rate is accelerated, and the influence to the normal business due to overlong backup time is decreased.

Tape drive system with tape surface inspection unit

Abstract: A tape drive system for ensuring tape data integrity by tape surface inspection, the tape drive system being configured for reading and writing data from/to a magnetic tape, is provided. The tape drive system includes a laser inspection unit comprising a sender and a receiver integrated into the tape drive system, wherein the laser inspection unit configured for recognizing a tape defect by scanning the magnetic tape when the tape drive system is in operation. The tape drive system includes a read/write head configured for acting together with the laser inspection unit as sensors for providing sensor data during a read/write operation of the tape drive system, a communication link between the sensors and a controller unit for exchanging sensor data. The controller is configured for evaluating sensor data and for triggering predefined actions based on the respective evaluation results such that the tape data integrity is ensured.

Tape apparatus and control device

Abstract: A tape apparatus includes a tape drive and a processor. The tape drive is configured to perform data reading and data writing on a magnetic tape in which a plurality of tracks are formed. The processor is configured to control the tape drive to perform data reading and data writing on the plurality of tracks in a first segment among a plurality of segments obtained by dividing the magnetic tape in a running direction. The processor is configured to reserve a first track of the plurality of tracks as a copy target upon determining that an abnormality occurs in the first segment on the first track. The processor is configured to instruct the tape drive to copy data recorded in the first segment on the first track to a second segment on the first track at a predetermined timing. The second segment is adjacent to the first segment.

Magnetic tape having characterized magnetic layer and back coating layer

Abstract: A magnetic tape includes: a non-magnetic support; a magnetic layer on one surface side of the non-magnetic support; and a back coating layer on the other surface side. The center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.0 nm to 1.8 nm. The magnetic layer includes ferromagnetic hexagonal ferrite powder and non-magnetic powder. The tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed using a scanning transmission electron microscope is 0.85 to 1.00. Further, the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the back coating layer is less than or equal to 0.060.

Fault detection diagnostic device of multisensor rotating machinery system

Abstract: At the rotating machinery failure diagnosis of system in -process, because time measuring is examined to it to the increasing substantially of the complexity of modern machinery system, often there are the low signal -to -noise ratio and the diagnostic scheduling problem with a low credibility of signal, utilize the information sometimes can judged result and unreliable. To foretell this kind of situation the utility model provides a multisensor tooth rotating machinery is fault detection diagnostic device all, a fault detection diagnostic device of multisensor rotating machinery system, and its constitution includes: the test bench, characterized by, the test bench overhead have the motor, gear box, antifriction bearing, data acquisition system, multichannel magnetic tape recorder and signal processing system, the motor be connected with antifriction bearing and gear box, the gear box be connected with data acquisition system, data acquisition system and multichannel magnetic tape recorder are connected, multichannel magnetic tape recorder be connected with signal processing system.

Magnetic tape and manufacturing method therefor

Abstract: PROBLEM TO BE SOLVED: To provide a magnetic tape which can exhibit excellent electromagnetic conversion characteristic, and which suppresses sticking of a magnetic tape surface to a magnetic head during repeated travels and an occurrence of a flaw on the magnetic tape surface.SOLUTION: Provided is a magnetic tape having a magnetic layer including ferromagnetic powder and a binder on a non-magnetic support, wherein the magnetic layer includes fatty acid ester, a full width at half maximum of a spacing distribution measured on a surface of the magnetic tape at a side of the magnetic layer in an optical interference method before vacuum-heated is more than 0 nm and not more than 5.0 nm, a full width at half maximum of the spacing distribution measured on the surface of the magnetic tape at the side of the magnetic layer in an optical interference method after vacuum-heated is more than 0 nm and not more than 5.0 nm, and a difference (SS) between a spacing Smeasured on the surface of the magnetic tape at the side of the magnetic layer in an optical interference method after vacuum-heated and a spacing Smeasured on the surface of the magnetic tape at the side of the magnetic layer in an optical interference method before vacuum-heated is more than 0 nm and not more than 8.0 nm. Also provided is a method for manufacturing the magnetic tape.SELECTED DRAWING: None

Magnetic tape, magnetic tape cartridge, magnetic recording playback apparatus, and manufacturing method for magnetic tape

Abstract: PROBLEM TO BE SOLVED: To provide a magnetic tape whose non-magnetic layer and magnetic layer have a total thickness of not more than 060 μm and that can exhibit satisfactory electromagnetic conversion characteristics even if high-speed transportation is repeatedSOLUTION: A magnetic tape has a non-magnetic layer on a non-magnetic supporting body and a magnetic layer containing ferromagnetic powder and a binder on the non-magnetic layer A total thickness of the non-magnetic layer and the magnetic layer is not more than 060 μm, the frictional coefficient measured in the basic material part on the magnetic layer surface is not more than 035, the magnetic layer at least contains one kind or more of constituents selected from a group consisting of aliphatic acid and aliphatic acid amide, and the concentration of C-H-derived C calculated from a C-H peak area rate in the magnetic layer surface at a photoelectron taking-out angle of 10 degrees C1s spectrum obtained by X-ray photoelectron spectral analysis conducted on the magnetic layer surface is not less than 45 atom% There are provided a manufacturing method for the magnetic tape, a magnetic tape cartridge and a magnetic recording playback apparatusSELECTED DRAWING: None

Magnetic tape measure mount

Abstract: Systems and methods for manufacturing, implanting and using a magnetic tape measure mount to secure a tape measure or other related instrument magnetically to a user, to a user's belt, or work belt.

Magnetic shielding tape for cable and method for manufacturing thereof

Abstract: A method for manufacturing a magnetic tape includes the steps of forming a thin film magnetic layer including at least one metal ribbon sheet, adhering a cover film layer to one side surface of the thin film magnetic layer through a first adhesive layer, performing flaking on the metal ribbon sheet included in the thin film magnetic layer to which the cover film layer is adhered, and adhering a conductive layer to the other side surface of the thin film magnetic layer, which includes the at least one metal ribbon sheet undergone the flaking, through a second adhesive layer, wherein the dividing includes dividing the thin film magnetic layer to provide a gap between adjacent fine pieces among the plurality of fine pieces by applying tension to the thin film magnetic layer in an extension direction of the magnetic shielding tape while the flaking is performed.

Magnetic tape abrasivity measurement

Abstract: A tape head writer yoke pole tip and a substrate ground plane are electrically coupled to the resistance measuring module. An electrically conductive wear layer is disposed over the pole tip and a ground plane at the tape bearing surface, forming a closed circuit. A magnetic tape is transported across the tape head and wears away the wear layer. The resistance measuring module identifies when the circuit becomes open, and an amount of tape travel until the open circuit occurred, and transmits this to a host computer for determination of a tape abrasivity measure as a function of the amount of tape travel. The write element can be used for write operations while the wear layer is present, and after the wear layer has been worn away.

Three advances make magnetic tape more than a memory [News]

Abstract: In the age of flash memory and DNAbased data storage, magnetic tape sounds like an anachronism. But the workhorse storage technology is racing along. Scientists at IBM Research say they can now store 201 gigabits per square inch on a special "sputtered" tape made by Sony Storage Media Solutions. The palm-size cartridge, into which IBM scientists squeezed a kilometer-long ribbon of tape, could hold 330 terabytes of data, or roughly 330 million books' worth. By comparison, the largest solid-state drive, made by Seagate, is twice as big and can store 60 TB, while the largest hard disk can store only 12 TB. IBM's best commercial tape cartridge, which began shipping this year, holds 15 TB.

Magnetic tape and magnetic tape unit

Abstract: PROBLEM TO BE SOLVED: To improve both of surface smoothness of a magnetic layer in a magnetic tape and head positioning accuracy in a timing base servo system.SOLUTION: The magnetic tape includes a non-magnetic layer containing nonmagnetic powder and a binder on a nonmagnetic support and a magnetic layer containing ferromagnetic powder and a binder on the non-magnetic layer. The magnetic layer has a timing base servo pattern; a center line average surface roughness Ra measured on the surface of the magnetic layer is 1.8 nm or less; one or more kinds of components selected from the group consisting of fatty acids and fatty acid amides are contained in at least the magnetic layer; and the concentration of C-H derived C calculated from a C-H peak area ratio in a C1s spectrum obtained by X ray photoelectron spectrometry performed at a photoelectron extraction angle of 10 degrees on the surface of the magnetic layer is 45 atom% or more.SELECTED DRAWING: None