106results about "Control/regulation carrier pressure" patented technology

A rigid magnetic recording disk drive includes a vacuum pump attached to the disk drive housing for removing air from within the housing so that the disk drive is operated at a reduced internal gas pressure. The pump motor is controlled by control circuitry that receives an input signal representative of the pressure within the housing to enable the pressure to be maintained within a predetermined reduced pressure range. Because spindle motor current has been directly correlated with internal pressure, a signal representative of the spindle motor current is used as the input to the pump control circuitry. The pump control circuitry also prevents the pump from turning on until the spindle motor has reached its stable operating speed, and from turning on when the disk drive is reading or writing data. Because of the reduced internal pressure the disk drive operates at a significantly higher disk RPM with only a minimal increase in power consumption and without any increase in track misregistration.

A disk drive includes a disk drive housing having a breather hole and a separate leak testing hole, both the breather hole and the leak testing hole being formed through the disk drive housing, and a drive sub-component attached to a surface of the disk drive housing so as to form an interface between the sub-component and the surface of the housing. The interface defines an interface outer perimeter and a sealed airflow testing channel in fluid communication only with the leak testing hole to enable a non-destructive detection of leaks at the interface. The airflow testing channel may be disposed within the interface outer perimeter.

A disk drive array system using a vacuum pump to reduce the disk drive internal pressures and/or a helium circulator to fill and circulate helium in a disk drive array to reduce vibrations, reduce power consumption, and increase cooling (when helium is used). The disk drive array system is also configured such that individual disk drives can be removed from the disk drive array without affecting the internal pressures of the remaining disk drives in the array.

In a disk drive device having a double cover structure with low-density gas enclosed therein, embodiments of the present invention help to securely perform leak inspection on an outer cover and to prevent defects caused in joining the outer cover. According to one embodiment, a hard disk drive (HDD) comprises a flow amount adjuster on a base-facing side of its inner cover. Helium gas in an enclosure goes out through a ventilation hole via diffusion channel of a flow amount adjuster. The emitted helium gas remains in the space between the inner cover and an outer cover. This achieves easier detection of the leakage of helium gas from the joining section of the outer cover and prevention of emission of too much helium gas from the enclosure.

Embodiments of the present invention help to prevent leakage of low-density gas during low-density gas injection into a disk drive device and to perform low-density gas injection efficiently. In a hard disk drive (HDD) according to one embodiment of the present invention, an injection hole filter with a valve function is attached to a helium injection hole in order to inject helium gas in an enclosure. The injection hole filter has a valve member configured to operate in an open state or closed state. The open state is a state while the helium gas is being injected and the closed state is a state after the helium gas has been finished to be injected. The valve member is in the open state if the outside pressure is higher than the inside pressure and is in the closed state if the inside pressure is higher than the outside pressure.

A cover plate for an optical disk drive designed to reduce disk vibrations and noise is provided. The cover plate is installed above a main frame of the optical disk drive and has a through hole in the center through which a disk clamp for clamping a disk placed on a turntable is fitted and a projection formed to oppose the disk up to a predetermined height in order to narrow a gap with the disk. Furthermore, the cover plate has a circular step formed opposite a surface corresponding to an outer circumference of the disk in the shape of an annular groove for lowering acoustic energy density of noise. The cover plate constructed in this way reduces disk vibration due to air damping effects resulting from a narrow gap between the disk and the cover plate while suppressing noise due to the presence of the abruptly expanded portion. Furthermore, the cover plate can be implemented without a separate device by making simple changes to the structure of cover plate.

A method and apparatus for sealing a hard disk drive with a low-density gas is provided. A valve body is positioned over an opening in the hard disk drive housing. The valve body is in communication with a source of low-density gas, a vacuum source and the interior of the disk drive. The vacuum source evacuates the internal cavity of the disk drive through the opening. The cavity is then filled with the low-density gas. A reciprocating member then positions a sealing member in the opening to seal the opening and capture the low-density gas within the disk drive.

A hard disk drive is disclosed which is highly reliable against environmental changes. A breather hole is formed in an enclosure which houses therein a magnetic disk and a magnetic head. An opening/closing control mechanism is provided in the breather hole. The opening/closing control mechanism is made up of a valve member for opening and closing the breather hole, a lever which supports the valve member at a fulcrum, a spring which urges the valve member in a closing direction through the lever, and a solenoid which causes the valve member to be displaced in an opening direction against the biasing force of the spring. When the hard disk drive is not operating, the breather hole formed in the enclosure 1 is closed to seal the enclosure hermetically. The breather hole is opened only in an operating condition of the hard disk drive in which the internal temperature of the enclosure rises, thereby minimizing an environmental deterioration in the interior of the enclosure caused by moisture, gases and particles entering from the exterior and preventing a lowering of reliability caused by corrosion of the magnetic disk and the magnetic head.

A disk drive has an internal breather filter that performs a filtration function while maintaining ventilation with an exterior of the drive. The filter circulates a gas between an interior and the exterior of its enclosure. The enclosure includes a first ventilation path for circulating the gas from the exterior to the filter, and a second ventilation path for circulating the gas from the filter to the exterior. In addition, a method of inspecting the filter and disk drive is disclosed. The method includes a compressing and decompressing step of compressing and decompressing the inside of the enclosure, a measuring step of measuring pressure in the enclosure, and a judging step of judging whether attachment of the filter is adequate on the basis of a value of the pressure measured.

A spindle motor includes a base portion and a bearing mechanism. A fixing region, which includes a first region at which the base portion and the bearing mechanism are fixed to each other and a second region at which a seal gap is defined between the base portion and the bearing mechanism, is located between an inner circumferential portion of the base portion which defines a through hole and an outer circumferential portion of the bearing mechanism. The inner circumferential portion of the base portion has, at least in the second region, a degree of surface roughness greater than a degree of surface roughness of the outer circumferential portion of the bearing mechanism. The seal gap gradually decreases in radial width with increasing height, and includes an adhesive along an entire circumference of the seal gap.

The invention relates to a data storage device and method, a black box, a vehicle, a controller and a medium. The device comprises a first storage area for storing vehicle data collected by a vehicledevice in real time, a detection module for detecting whether a preset event occurs, and a second storage area for storing vehicle data in a preset time period acquired from the first storage area andthe vehicle device when the preset event occurs. Through adoption of the method, vehicle data is stored safely and reliably, and desired data is convenient to acquire.

A top cover for use in a disk drive apparatus includes a plate made of a metal and a gasket fixed to the plate. The gasket is made of an elastomer. A surface of the plate includes a fixing region to which the gasket is closely adhered. The fixing region includes a plurality of ridges and in plan view a plurality of filamentous projections extending from each of the plurality of ridges. The plurality of ridges are arranged in the fixing region to increase a surface area of the fixing region. The plurality of ridges and the plurality of filamentous projections extending from each ridge are distributed over the fixing region.

Embodiments of the present invention provide a magnetic disk drive that can estimate the amount of gas filled in a housing precisely and simply. According to one embodiment, a magnetic disk drive including a housing in which a magnetic disk and a magnetic head are accommodated and gas having lower density than air is filled, a heating body provided in the housing, and means for holding a reference value of a parameter representing the temperature change speed of the heating body when the heating body is heated in the housing filled with a predetermined reference amount of the gas.

A sealed disk media enclosure is provided. The sealed disk media enclosure in one example includes a media enclosure structure formed of a porous material and including a disk media chamber and a chamber aperture on one side of the media enclosure structure, one or more disk media located in the disk media chamber, a Diamond-Like Carbon (DLC) coating on at least a portion of the media enclosure structure, with the DLC coating preventing passage of gas molecules through the media enclosure structure, and a cover affixed to the media enclosure structure and substantially sealing the chamber aperture, wherein a predetermined gas or gas mixture is sealed within the disk media chamber.

A hard disk drive effectively removes internal humidity therefrom and thus improves the reliance and performance of the hard disk drive in high and increased humidity environments.

A servo writer that writes servo information onto a disk of a hard disk drive. The servo writer can write servo information onto a disk of a hard disk drive while the disk is within an inner chamber of a housing. The rotating disk creates a flow of fluid within the inner chamber. The disk is rotated during the servo writing process. The density of a fluid medium within the inner chamber is controlled by a medium control system so that the density of the medium is less than the density of air at one atmosphere. Lowering the density decreases the amplitude of vibrational forces created by the flow of fluid. Decreasing the amplitude reduces errors in the servo writing process. The density can be reduced by pulling a vacuum within the inner chamber. The density can also be reduced by filling the inner chamber with a gas such as helium that has a lower density than air.