226results about "Disk carriers" patented technology

According to one embodiment, a disk device includes a disk-shaped recording medium, an actuator assembly provided to be rotatable and supporting a magnetic head, and a first stopper and a second stopper, arranged contactable with the actuator assembly. At least one of the first stopper and the second stopper includes a cushioning member having a contact surface contactable with the actuator assembly, and a gas adsorption member provided to surround the cushioning member except for the contact surface.

The present invention relates to an aluminum alloy disk material (1) having: a peeled surface, which is obtained by peeling a base layer containing Ni from at least one recycled material of an intermediate material or finished product including an aluminum alloy disk and the base layer; and an oxide film (10) on the surface of the peeled surface.

To provide an aluminum alloy plate for a magnetic disk, an aluminum alloy plate blank for a magnetic disk, and an aluminum alloy plate substrate for a magnetic disk, which have good rigidity and are capable of suppressing thermal deformation during magnetic film sputtering.SOLUTION: An aluminum alloy plate for a magnetic disk contains 0.1-7.0 mass % of Mg, 0.005-1.0 mass % of Cr, 3-100 mass ppm of Be, Mn, 100 mass ppm or less of Ti, and 0.20 mass % or less of Si. The total of at least one or more of Fe, Mn, and Ni is 0.03-5.9 mass %, and the remainder comprises Al and impurities. The solid-soluble amount of Mn in an aluminum parent phase is 0.03 mass % or more.SELECTED DRAWING: None

To provide a film-forming device capable of stabilizing a film thickness distribution of a protective film.SOLUTION: A film-forming device according to the present invention includes: a film-forming chamber; a holder for holding a substrate inside the film-forming chamber; an inlet pipe for introducing a carbon-containing source gas into the film-forming chamber; a cathode electrode with a filament shape; a first power supply that heats the cathode electrode by applying current; an anode electrode provided around the cathode electrode; a second power supply that generates a discharge between the cathode electrode and the anode electrode; a third power supply that applies the potential difference between the cathode electrode or the anode electrode and the substrate; an ionization region, in which the gas is ionized by the discharge; and an acceleration region, in which the ionized gas is accelerated by the potential difference, in which a soft magnetic cylinder is provided around the acceleration region.SELECTED DRAWING: Figure 1

An information recording medium disc according to an embodiment is a disc having a plate thickness of 0.51 mm or less, and is provided with a substrate and a cover layer. The substrate has one main surface and another main surface, and also has a side wall surface connecting the two main surfaces. A cover layer covers both main surfaces and side wall surfaces of the substrate. The disk has a specific elastic modulus E / d [106 m2 / s2] of 40 or more as calculated from a Young's modulus E [GPa] and a density d [g / cm3]. When 30 [G] impact of 2 [m seconds is applied to the disk in the normal direction of the main surface of the disk substrate in a state in which the inner peripheral end of the disk is fixed, the maximum amplitude caused by vibration in the thickness direction of the outer peripheral end of the disk substrate is 0.25 mm or less.

A glass substrate for a magnetic recording medium of the present invention has an average coefficient of linear thermal expansion within a temperature range of from 30° C. to 380° C. of from 30×10−7 / ° C. to 40×10−7 / ° C., a Young's modulus of 80 GPa or more, a specific Young's modulus of 30 GPa / g·cm−3 or more, and a strain point of 700° C. or more.

An alkali-free glass sheet according to the present invention contains, as a glass composition, in mol %, from 60% to 80% of SiO2, from 12% to 15% of Al2O3, from 1.2% to 4% of B2O3, from 0% to 0.5% of Li2O+Na2O+K2O, from 2% to 8% of MgO, from 2% to 11% of CaO, from 0% to 5% of SrO, from 0% to 5% of BaO, and from 10% to 16% of MgO+CaO+SrO+BaO, in which a mol % ratio B2O3 / Al2O3 is from 0.1 to 0.3, a mol % ratio (B2O3+BaO) / SiO2 is from 0.01 to 0.1, and MgO+CaO+SrO+BaO—Al2O3 is from −2% to +2%.

The invention discloses a rotating wheel device for realizing information interaction through Hall induction in the technical field of Hall induction, comprising a rotating disk, a magnet device and a Hall probe device, wherein the magnet device is fixedly connected to the top of the rotating disk, and the Hall probe device is fixedly connected to the bottom of the rotating disk, and the rotating disk comprises a first quadrant, a second quadrant, a third quadrant, a fourth quadrant, a fifth quadrant and a sixth quadrant, and is distributed in a clockwise ring shape. The rotating wheel device for realizing information interaction through Hall induction divides the rotating disk into six quadrants, installs a Hall probe device under the rotating disk, and installs a magnet device on the six quadrants at the same time, and through the Hall induction principle, enables the Hall probe to read the magnetism of the magnet device arranged according to a fixed rule on the rotating disk and send a signal, and after being processed by a single-chip computer program, accurately identifies the rotation information of the rotating disk, has a simple structure, does not require mechanical contact, has a small loss rate, a long service life, and saves costs.

To provide an aluminum alloy sheet for a magnetic disk, an aluminum alloy sheet blank for the magnetic disk, and an aluminum alloy sheet substrate for the magnetic disk, having satisfactory rigidity and capable of suppressing thermal deformation during magnetic film sputtering.SOLUTION: An aluminum alloy sheet for a magnetic disk, comprising: 0.1 to 7.0 mass% of Mg; 0.005 to 1.0 mass% of Cr; 3 to 100 mass ppm of Be; 0.20 mass% or less of Si; 0.05 to 5.9 mass% of at least one or more of Fe, Mn, and Ni in total; and a balance of Al and impurities.SELECTED DRAWING: None

Provided is a fluorine-containing ether compound represented by the following formula. R1-R2-O-CH2-R3-CH2-O-R4-R5 (R3 is a perfluoropolyether chain; R2 is represented by formula (2), R4 is represented by formula (3), and R1 and R5 are each a hydrogen atom or represented by formula (4); in formula (2), a and b are integers of 0-2 and c is an integer of 2-5; in formula (3), d and e are integers of 0-2 and f is an integer of 2-5; at least one of b in formula (2) and e in formula (3) is 1 or greater; and k in formula (4) is an integer of 3-6.)

The present invention relates to an aluminum alloy disc blank for a magnetic disc, characterized by being formed of an aluminum alloy containing Fe: 0.005 to 1.800 mass%, the balance consisting of Al and unavoidable impurities, and a flatness change of the aluminum alloy disc blank for a magnetic disc being 2.0 μm or less when the aluminum alloy disc blank for a magnetic disc is kept in the atmosphere at 50°C or lower for 336 hours.

Disclosed is a fluorine-containing ether compound which is represented by the formula shown below. R1-O-CH2-R2-(CH2-R3-CH2-R2)n-CH2-O-R4 (In the formula, R1 is formula (2-1) or formula (2-2). R2 represents a perfluoropolyether chain. R4 represents an organic group that has at least one polar group and 1 to 50 carbon atoms. R3 represents a divalent linking group that has at least one hydroxyl group. n is an integer of 0 to 2.)

Embodiments of the present invention relate to a disk device and an electronic device. The disk device includes a housing, a disk-shaped recording medium, a magnetic head, an internal wireless communication device, and internal components. The housing has a storage space provided therein. The recording medium is stored in the storage space and has a recording layer. The magnetic head is stored in the storage space and is configured to read and write information with respect to the recording medium. The internal wireless communication device performs at least one of the following operations: generating an electrical signal of information written by the magnetic head to the recording medium corresponding to light, a magnetic field, or an electric field generated by an external wireless communication device; and generating light, a magnetic field, or an electric field corresponding to the electrical signal of information read by the magnetic head from the recording medium toward the external wireless communication device. The internal components are stored in the storage space, are electrically connected to the magnetic head, and communicate with external components outside the housing through the internal wireless communication device and the external wireless communication device.

Described are systems, methods, and media for magnetic recording assisted by the use of ultrafast pulses such as ultrafast laser pulses. A layered magnetic medium includes a thin, magnetically softer capping layer disposed over a magnetically harder data recording layer. The capping layer is configured to have fast magnetization dynamics, and to have faster magnetization dynamics than the data recording layer. Due to the fast magnetization dynamics of the capping layer, ultrafast pulses can be used to assist a magnetic write field in magnetizing the capping layer without inducing any significant heating in the bulk of the media. The magnetization of the capping layer nucleates magnetization in the data recording layer under the influence of the magnetic write field.

To provide a glass for a magnetic recording medium substrate having excellent heat resistance and rigidity, a magnetic recording medium substrate made of the glass, a magnetic recording medium including the substrate, and a glass spacer for a magnetic recording device.SOLUTION: A glass for a magnetic recording medium substrate is an amorphous oxide glass having a SiO2 content of 56 to 80 mol%, a Li2O content of 1 to 10 mol%, a B2O3 content of 0 to 4 mol%, a total content of MgO and CaO (MgO+CaO) of 9 to 40 mol%, a specific gravity of 2.75 g / cm3 or less, a glass transition temperature of 650°C or more, and a Young's modulus of 90 GPa or more.SELECTED DRAWING: None

A fluorine-containing ether compound represented by formula (1). R < 1 >-O-CH < 2 >-R < 2 >-CH < 2 >-O-R < 3 > (R < 2 > is a perfluoropolyether chain. R1 is a formula (2-1) or a formula (2-2). And R3 is an organic group having at least one polar group and having 2-65 carbon atoms. In formula (2-1), X1 is a divalent linking group having 1-40 carbon atoms. Y1 and Z1 are organic groups with 1-12 carbon atoms or hydrogen atoms. At least one of X1, Y1, and Z1 contains a primary hydroxyl group. In the formula (2-2), X2 is a divalent linking group having 1-40 carbon atoms. And Y2 is an organic group with 1-12 carbon atoms or a hydrogen atom. And Z2 is an organic group with a carbon atom number of 1-12. And at least one of X2, Y2, and Z2 contains a primary hydroxyl group. )

The present disclosure provides a disk device capable of suppressing failure due to exhaust and improving reliability. According to one embodiment, a disk device includes: a disk-shaped recording medium; an actuator assembly provided in a rotatable manner; a magnetic head supported on the actuator assembly; and a first stopper and a second stopper disposed so as to be capable of abutting against the actuator assembly. At least one of the first stopper and the second stopper is provided with: a buffer member having a contact surface capable of coming into contact with the actuator assembly; and a gas-adsorbing material provided so as to surround a portion of the buffer member other than the contact surface.

According to one embodiment, a magnetic disk device includes a disk, a write head, a write processing unit, an error correction unit, a correction limit prediction unit, and a determination unit. During a write period in which the write processing is executed on the second data track, the correction limit prediction unit is capable of determining whether or not data of each of the target sectors of the first data track is damaged, and generates prediction information, and the determination unit determines whether or not to cause the write processing unit to continue the write processing on the second data track based on the prediction information.

To provide an aluminum alloy plate for a magnetic disk, an aluminum alloy plate blank for a magnetic disk, and an aluminum alloy plate substrate for a magnetic disk, which have good grindability and are capable of suppressing thermal deformation during magnetic film sputtering.SOLUTION: An aluminum alloy plate for a magnetic disk contains 0.1-7.0 mass % of Mg, 0.005-1.0 mass % of Cr, 3-100 mass ppm of Be, 100 mass ppm or less of Zr, and 0.20 mass % or less of Si. The total of at least one or more of Fe, Mn, and Ni is 0.05-3.0 mass %, and the remainder comprises Al and impurities. The area ratio of an intermetallic compound on a surface is 0.10-40%, and the area ratio is calculated for an intermetallic compound having a maximum length of 0.33 μm or more.SELECTED DRAWING: None

A glass plate configured to be cut into glass substrates for magnetic recording disks is described. The glass plate includes a first surface. For surface features of the first surface having a characteristic wavelength of 60 to 500 micrometers (μm), the root mean square of the surface topography of the surface features determined using surface analysis on the first surface with incident light and reflected light is given as microwaviness. The maximum value of the microwaviness of any region of the first surface may be greater than or equal to 1.2 nanometers (nm) and less than or equal to 2.8 nm. After the surface analysis, the glass plate may be cut into glass substrates in response to determining that the maximum value of the microwaviness is within the range. Further, a method of manufacturing glass substrates from the glass plate is described.

To provide a method for producing a magnetic recording medium capable of having a magnetic layer with high crystal orientation and few defects, a magnetic recording medium, and a magnetic storage device.SOLUTION: A method of producing a magnetic recording medium 1 includes: a step of forming a magnesium oxide underlayer 20 on a surface of a substrate 10 by a sputtering method with using a target containing magnesium oxide; and a step of forming a magnetic layer 30 on the surface side of the magnesium oxide underlayer 20, in which the target containing the magnesium oxide is heated to more than 600°C when forming the magnesium oxide underlayer 20.SELECTED DRAWING: Figure 1

Provided are a method for manufacturing a disk-shaped substrate having excellent flatness of a plating layer and excellent thickness uniformity of a chemically strengthened layer, and a magnetic recording medium. [Solution] A method for manufacturing a disk-shaped substrate, which comprises subjecting a disk-shaped substrate ground with a grinding fluid to at least one treatment selected from the group consisting of (1) heating, (2) washing with an organic solvent, and (3) ultraviolet light irradiation treatment, to remove at least a portion of the polymeric components of the grinding fluid on the surface of the disk-shaped substrate.

This fluorine-containing ether compound is represented by R1-R2-Y-(CH2)z-O-CH2-R3[-CH2-R4-CH2-R3]x-CH2-O-(CH2)z-Y-R5-R6 (x is 0-1; z is an integer of 2-10; Y is any of O, NH, or S; R3 is a perfluoropolyether chain; R4 is a divalent linking group having 1-3 hydroxyl groups and having oxygen atoms at both ends; R2 is formula (2-1) or (2-2); R5 is formula (2-3) or (2-4); and R1 and R6 are end groups.).

To provide a sputtering target capable of depositing a granular thin film with an excellent magnetic separability, the granular film being a magnetic film composed of a CoPt-based alloy.SOLUTION: The present invention relates to a sputtering target for a magnetic recording medium including Co and Pt as a metal component and including at least one kind of oxide. In the present invention, the sputtering target contains a tungsten oxide and / or a molybdenum oxide as a mandatory oxide for improving a magnetic separability, and a content of the mandatory oxide is 15 vol.% or less. As an oxide in the sputtering target, another oxide such as B2O3 may be contained as an optional oxide. In this case, a total oxide content is preferably 20 vol.% or more and 50 vol.% or less. In the present invention, the toral oxide content can be suitably set while maintaining the magnetic separability by applying the mandatory oxide.SELECTED DRAWING: Figure 1

The present invention relates to an aluminum alloy disc blank for a magnetic disc, characterized by being formed of an aluminum alloy containing Mg: 3.40 to 3.90 mass%, the balance consisting of Al and unavoidable impurities, the aluminum alloy disc blank for a magnetic disc having an electrical conductivity of 36.0% IACS or more.

To provide a disk device capable of improving the strength of coupling between an end surface of a base and an outer cover.SOLUTION: A disk device according to one embodiment includes a magnetic disc, a base, a film, an inner cover, and an outer cover. The base is provided with an inner space and has: a first inner surface that surrounds the magnetic disk; a support surface that is connected to an end of the first inner surface in a first direction; a second inner surface that is more separated from a rotation axis of the magnetic disk than the first inner surface and is also connected to the support surface; and an end surface that is connected to an end of the second inner surface in the first direction. The film covers a coating region included in the second inner surface and is separated from the end surface and an exposure region included in the second inner surface and aligned with the coating region around the rotation axis. The inner cover is supported on the support surface and is surrounded with the second inner surface. The outer cover is at least partially coupled to the base.SELECTED DRAWING: Figure 1

A substrate for a magnetic disk, characterized by being composed of an aluminum alloy containing one or two or more of Fe: 8.5 mass% or less, Mn: 2.5 mass% or less, Ni: 6.5 mass% or less, and Mg: 4.5 mass% or less, with the remainder composed of Al and unavoidable impurities, a resonance frequency being f (Hz), a density being p (g / cm 3 ), and a plate thickness being t (mm), (f x p / t) being 3800 or more, and a magnetic disk using the substrate for a magnetic disk.

The present invention relates to a sputtering target for a magnetic recording medium containing Co and Pt as metal components and containing at least one oxide. In the present invention, as an essential oxide for improving magnetic separation, tungsten oxide and / or molybdenum oxide is contained, and the content of the essential oxide is 15 vol% or less. As the oxide in the sputtering target, other oxides such as B2O3 can also be contained as optional oxides, and in this case, the total oxide content is preferably 20 vol% or more and 50 vol% or less. In the present invention, by applying the essential oxide, the total oxide content can be appropriately set while ensuring magnetic separation. According to the present invention, a granular thin film composed of a CoPt-based alloy having good magnetic separation can be formed.

Disclosed is a fluorine-containing ether compound which is represented by the formula shown below. R1-O-CH2-R2-(CH2-R3-CH2-R2)n-CH2-O-R4 (In the formula, R1 is formula (2-1) or formula (2-2). R2 represents a perfluoropolyether chain. R4 represents an organic group that has at least one polar group and 1 to 50 carbon atoms. R3 represents a divalent linking group that has at least one hydroxyl group. n is an integer of 0 to 2.)