CN116230027A

CN116230027A - Hard disk and electronic device

Info

Publication number: CN116230027A
Application number: CN202211677280.0A
Authority: CN
Inventors: 罗勇
Original assignee: XFusion Digital Technologies Co Ltd
Current assignee: XFusion Digital Technologies Co Ltd
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-06-06

Abstract

Embodiments of the present disclosure provide a hard disk and an electronic device. The magnetic head is used for solving the problem that when the hard disk is used in a high-altitude area, the magnetic head can scratch the disk in a low way, and the disk and the magnetic head are damaged. The hard disk includes a disk body, a disk, an actuator arm, a magnetic head, a deforming device, and a control circuit. The tray body is provided with an air channel; the disc is rotatably arranged in the disc body; the actuating cantilever has elasticity and comprises a first end and a second end; the first end is disposed within the tray body. The magnetic head is disposed on the second end. The deformation device is fixed on the execution cantilever; can deform to drive the second end of the actuating cantilever to displace along the rotation axis of the disc away from one side of the disc. The control circuit is electrically connected with the deformation device and is used for controlling the deformation device to deform.

Description

Hard disk and electronic device

Technical Field

The present disclosure relates to the field of data storage technologies, and in particular, to a hard disk and an electronic device.

Background

When the hard disk is used in a high-altitude area (for example, the altitude exceeds 3048 m), the lifting force applied to the magnetic head is reduced due to lower atmospheric pressure in the high-altitude area, so that the magnetic head is lower and scratches on the disk, and the magnetic head and the disk are damaged.

Disclosure of Invention

An object of an embodiment of the present disclosure is to provide a hard disk and an electronic device, which are used for solving the problem that when the hard disk is used in a high altitude area, a magnetic head may scratch a disk, resulting in damage to the disk and the magnetic head.

In one aspect, embodiments of the present disclosure provide a hard disk. The hard disk includes a disk body, a disk, an actuator arm, a magnetic head, a deforming device, and a control circuit. The tray body is provided with an air channel; the disc is rotatably arranged in the disc body; the actuating cantilever has elasticity and comprises a first end and a second end; the first end is disposed within the tray body. The magnetic head is disposed on the second end. The deformation device is fixed on the execution cantilever; can deform to drive the second end of the actuating cantilever to displace along the rotation axis of the disc away from one side of the disc. The control circuit is electrically connected with the deformation device and is used for controlling the deformation device to deform.

When the hard disk is used in a high-altitude area, the control circuit controls the deformation device to deform, and the deformation device adjusts the position of the second end along the rotation axis of the disk. The deformation device is furthermore fixedly arranged on the actuator arm. In this way, the second end of the deformation device adjusting execution cantilever can move to the side far away from the disc, and the magnetic head can move along with the second end of the execution cantilever, namely, the magnetic head can move to the side far away from the disc, so that the position of the magnetic head is increased, namely, the flying height of the magnetic head is increased; further, the problem that the magnetic head damages the disc and causes damage to the magnetic head in high altitude areas is solved. In addition, the lower magnetic head can cause that the magnetic disk can not accurately store information, but the embodiment can adjust the flying height of the magnetic head, so that the magnetic head can read and write information on the magnetic disk when the hard disk is used in a high-altitude area, and the hard disk can store information in the high-altitude area.

When the hard disk is used in a low-altitude area, the deformation device is not required to be started or closed. Under the condition of closing the deformation device, the deformation device recovers deformation, so that the second end of the execution cantilever is lowered, and the magnetic head recovers to an initial state; the initial state can be understood as the position of the magnetic head when the hard disk is used in a low altitude area (e.g., marked with atmospheric pressure) and the hard disk can store information (e.g., the magnetic head reads and writes information on a rotating disc). Thus, the hard disk can be used in low altitude areas, so that the magnetic disk stores information; the flying height of the magnetic head can be adjusted, and the problem that the magnetic head and the disc are damaged when the magnetic head is used in a high-altitude area is avoided.

Alternatively, the deformation device is a piezoelectric device, which is capable of deforming in a length direction of the actuator arm when energized. The volume is smaller, so that the weight of the device is lighter; in addition, the cost is lower; and the installation in the disk body does not occupy more space of the disk body.

Optionally, the deformation device is fixedly arranged on one side of the execution cantilever, which is away from the disc; the deformation device can shrink along the length direction of the execution cantilever;

the force generated by the contraction of the deformation device acts on the upper surface of the execution cantilever, so that the execution cantilever bends upwards, the second end of the execution cantilever is heightened, and the flying height of the magnetic head is further improved. In addition, the magnetic head can read and write information when the flying height is increased, so that the magnetic disk can be used in high altitude areas.

Optionally, the deformation device is fixedly arranged on one side of the execution cantilever close to the disc; the deformation means is capable of expanding in a direction parallel to the length direction of the actuating cantilever.

The force generated by the expansion of the deformation device acts on the lower surface of the execution cantilever, so that the execution cantilever bends upwards, the second end of the execution cantilever is heightened, and the flying height of the magnetic head is further improved. In addition, the magnetic head can read and write information when the flying height is increased, so that the magnetic disk can be used in high altitude areas.

Optionally, the deformation device is arranged in the middle of the actuating cantilever.

Optionally, the control circuit includes a first switch and a power source, the first switch is disposed outside the disc body and has a first state. The power supply is connected in series with the deformation device and the first switch. Under the condition that the first switch is in a first state, the first switch conducts the deformation device with a power supply so that the deformation device deforms.

Optionally, the control circuit includes a second switch and a controller, the second switch is disposed outside the disc body and has a second state; the controller is electrically connected with the switch and the deformation device and is configured to control the deformation device to deform under the condition that the second switch is in the second state.

Optionally, the control circuit is electrically connected with the magnetic head; the control circuit is configured to control the deformation device to be powered on or powered off according to the strength of the magnetic signal sent by the magnetic head.

Optionally, the control circuit is electrically connected to the magnetic head. The control circuit is configured to control the deformation device to deform according to the strength of the magnetic signal sent by the magnetic head, so that the deformation device adjusts the second end to approach or depart from the disc along the rotation axis of the disc.

Optionally, the control circuit is configured to loop: and under the condition that the amplitude of the magnetic signal sent by the received magnetic head is larger than the threshold value, increasing and controlling the deformation of the deformation device, so that the deformation device moves in the direction away from the disc until the amplitude of the magnetic signal sent by the received magnetic head is smaller than or equal to the threshold value.

Optionally, the deformation device is attached to the actuator arm. The mounting of the deformation device and the execution cantilever can be realized rapidly.

In another aspect, embodiments of the present disclosure provide an electronic device including a hard disk and a circuit board assembly configured to store data in the hard disk or read data in the hard disk.

Drawings

In order to more clearly illustrate the technical solutions of the present disclosure, the drawings that need to be used in some embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings may be obtained according to these drawings to those of ordinary skill in the art. Furthermore, the drawings in the following description may be regarded as schematic diagrams, not limiting the actual size of the products, the actual flow of the methods, the actual timing of the signals, etc. according to the embodiments of the present disclosure.

FIG. 1 is a block diagram of an electronic device according to some embodiments;

FIG. 2 is a block diagram of a hard disk according to some embodiments;

FIG. 3 is a block diagram of a tray according to some embodiments;

FIG. 4 is a schematic diagram of a hard disk according to some embodiments;

FIG. 5 is a schematic diagram of altitude and head fly height according to some embodiments;

FIG. 6 is a schematic diagram of FIG. 2A;

FIG. 7 is another schematic diagram of FIG. 2 at A;

FIG. 8 is another schematic diagram of FIG. 2 at A;

FIG. 9 is a block diagram of another hard disk according to some embodiments;

FIG. 10 is a circuit diagram of a control circuit according to some embodiments;

FIG. 11 is a block diagram of a control circuit and a deformation device according to some embodiments;

FIG. 12 is a block diagram of another control circuit and a morphing device according to some embodiments;

FIG. 13 is a block diagram of another control circuit and a morphing device according to some embodiments;

FIG. 14 is a schematic diagram of magnetic signals of a magnetic head according to some embodiments.

Detailed Description

The following description of the embodiments of the present disclosure will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by one of ordinary skill in the art based on the embodiments provided by the present disclosure are within the scope of the present disclosure.

Throughout the specification and claims, the term "comprising" is to be interpreted as an open, inclusive meaning, i.e. "comprising, but not limited to, unless the context requires otherwise. In the description of the present specification, the terms "one embodiment," "some embodiments," "example embodiments," "examples," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.

At least one of "A, B and C" has the same meaning as at least one of "A, B or C," both include the following combinations of A, B and C: a alone, B alone, C alone, a combination of a and B, a combination of a and C, a combination of B and C, and a combination of A, B and C.

"A and/or B" includes the following three combinations: only a, only B, and combinations of a and B.

The use of "adapted" or "configured to" herein is meant to be an open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

An embodiment of the present disclosure provides an electronic device. In an embodiment, the electronic device may be one of various computing devices such as a desktop computer, a laptop computer, a workstation, a server, a smart phone, a tablet, a digital camera, and a black box.

Referring to fig. 1, an electronic device may include a circuit board assembly 1100 and a memory device 1200. The circuit board assembly 1100 may control the overall operation of the electronic device. For example, the circuit board assembly 1100 may be an Application Processor (AP) that controls the overall operation of the electronic device. The circuit board assembly 1100 may run an operating system, programs, or applications executable on the electronic device.

The circuit board assembly 1100 may store data in the memory device 1200 or may read data stored in the memory device 1200. The circuit board assembly 1100 may include a processor 1110, a cache device (cache memory device) 1120 (i.e., a cache memory), and a memory controller 1130. The processor 1110 may perform various operations for an electronic device and may process data.

In response to signals received from processor 1110, cache device 1120 may store data or may provide data stored therein to processor 1110. The cache device 1120 may support a higher access speed than the memory device 1200. For example, since a part of data stored in the storage device 1200 is stored in the cache device 1120, the speed of access according to a request of the processor 1110 can be increased. In an embodiment, the cache device 1120 may be a Static Random Access Memory (SRAM) device, but the disclosure is not limited thereto.

The memory controller 1130 may control the memory device 1200. For example, the memory controller 1130 may transmit an address ADDR, a command CMD, a control signal CTRL, and a DATA mask (mask) signal DM to the memory device 1200 to control the memory device 1200, and may exchange DATA "with the memory device 1200 through the DATA line DQ.

The memory device 1200 may operate under the control of a memory controller 1130. For example, the memory device 1200 may store DATA "or may provide the stored DATA" to the memory controller 1130 in response to a signal received from the memory controller 1130. In an embodiment, the memory device 1200 may be a mechanical hard disk or the like. The present disclosure is not limited thereto.

The embodiment of the disclosure also provides a hard disk. The hard disk may be the memory device 1200 shown in fig. 1, and the hard disk may be applied to the above-described electronic apparatus. Referring to fig. 2, the hard disk may be a mechanical hard disk that may include a mechanical assembly 10 and a control circuit 20. Control circuitry 20 is used to control machine assembly 10 and the transfer of information to and from machine assembly 10 to enable the hard disk to store information. Wherein mechanical assembly 10 may include a disk 100, a disk 110, an actuator suspension 140, and a magnetic head 120.

Referring to fig. 3, a disc body 100 has a disc cavity for accommodating a disc 110, an actuator arm 140, a magnetic head 120, and the like. In some examples, tray 100 may include an upper cover 101 and a bottom case 102. The upper cover 101 and the bottom case 102 may be fastened, for example, by screws, to form a tray body 100 having a tray cavity.

The tray body 100 has an air passage 1021 (which may also be referred to as an air hole). The air passage 1021 may make the air pressure inside and outside the tray body 100 the same. For example, the base may be provided with an air passage 1021. In some examples, a filter (e.g., a high efficiency filter) is disposed within the tray 100; the filter is located at the air passage 1021 for filtering air entering the tray 100 from the air passage 1021, so that the tray 100 is clean and dust-free.

With continued reference to fig. 2, a three-dimensional coordinate system in three-dimensional XYZ directions is established in fig. 2. The X direction, the Y direction and the Z direction are perpendicular. The X direction may be parallel to an extension line of the tray body 100 in the width direction, the Y direction may be parallel to an extension line of the tray body 100 in the length direction, and the Z direction may be a thickness direction of the tray body 100.

Disc 110 (which may also be referred to as a disk or a magnetic disk) is used to record data. Disc 110 is rotatably disposed within disc body 100. In some examples, the hard disk further includes a spindle motor 160. The spindle motor 160 is fixedly disposed in the tray body 100; for example, the spindle motor 160 is fixedly disposed on the bottom case 102 and is located in the disc cavity. The spindle motor 160 is coaxially coupled to the disc 110 such that the disc 110 can be rotated by the spindle motor 160. Wherein the disk 110 may be parallel to the plane of X Y. The spindle motor 160 is electrically connected to the control circuit 20, and the control circuit 20 controls the spindle motor 160 to rotate.

In some examples, disk 110 may include a substrate and a magnetic layer in a stacked arrangement. The material of the substrate can be plastic, aluminum, glass, etc. The magnetic layer is made of magnetic material.

The suspension 140 is implemented for mounting the magnetic head 120. The implement cantilever 140 includes opposite first and second ends 141, 142. The magnetic head 120 is disposed on the second end 142. The actuating cantilever 140 is rotatably disposed within the tray 100, such as the first end 141 is rotatably disposed within the tray 100. Thus, in the case of performing rotation of the suspension 140, the suspension 140 may be performed to move the magnetic head 120 onto the disk 110, so that the magnetic head 120 reads and writes information on the disk 110.

In some examples, the hard disk further includes a seek servo motor 150 (e.g., a stepper motor that may be voice coil type rotary or linear motion). The seek servo motor 150 is disposed within the disc body 100; a seek servo motor 150, for example, is disposed on the bottom case 102 and is located within the disc cavity. The shaft end of the seek servo motor 150 is fixedly connected to the first end 141 of the actuating arm 140. The first end 141 may be understood as the axis where the cantilever 140 is connected to the shaft end of the seek servo motor 150. Thus, the seek servo motor 150 can drive the actuator arm 140 to rotate, and the magnetic head 120 rotates along with the actuator arm 140. The seek servo motor 150 is electrically connected to the control circuit 20, and the control circuit 20 controls the seek servo motor 150 to rotate.

The actuating cantilever 140 has elasticity; for example, the actuator arm 140 is capable of being elastically deformed in the rotational axis direction (Z direction as shown in fig. 2) of the disc 110.

Referring to fig. 4, when the hard disk is operated in a low altitude area (e.g., an area marked with an atmospheric pressure), the seek servo motor 150 drives the actuator arm 140 to rotate, and the magnetic head 120 rotates with the actuator arm 140, so that the magnetic head 120 can move onto the disk 110. The spindle motor 160 rotates the disc 110, and aerodynamically, the air around the disc 110 rotates along with the disc 110 to generate a lifting force acting on the magnetic head 120 along the Z direction as shown in fig. 2, where the magnetic head 120 is also subjected to a force opposite to the lifting force (for example, a pressure acting on the magnetic head 120 by the suspension 140, or a gravity of the magnetic head 120, or a resultant force of the two), so that a distance exists between the magnetic head 120 and the disc 110 (the distance may be referred to as a flying height H), and the magnetic head 120 can read and write information on the disc 110 at the flying height H, so that the hard disk can store information.

According to the principle of elevation rise and barometric pressure reduction. Referring to fig. 5, the hard disk is operated in a high altitude area (an area having an altitude exceeding 3048m, for example, an area having an altitude of 3048 m) such that less gas is generated around the disk 110. When the disk 110 rotates, the gas around the disk 110 follows the disk 110 to rotate, so that the lifting force acting on the magnetic head 120 is small; so that the head 120 moves to one side of the disc 110, i.e., the flying height of the head 120 is lowered, for example, the head 120 contacts the disc 110 as shown in fig. 4, thereby causing the head 120 to scratch the disc 110, damaging the head 120 and the disc 110.

With continued reference to fig. 2 and 4, in order to solve the problem that the flying height of the magnetic head 120 is reduced when the hard disk is used in a high altitude area, in the present embodiment, the mechanical assembly 10 further includes a deformation device 130 electrically connected to the control circuit 20. The deformation device 130 is fixedly disposed on the actuating cantilever 140.

When the hard disk is used in a high altitude area, the control circuit 20 controls the deformation device 130 to deform along the length direction of the actuator arm 140, for example, so as to drive the second end 142 of the actuator arm 140 to move along the rotation axis of the disk 110 to a side far away from the disk 110. The rotational axis of disc 110 may be the Z direction shown in fig. 2.

Thus, the deformation device 130 adjusts the second end 142 of the actuator arm 140 to move away from the disc 110, and the magnetic head 120 follows the second end 142 of the actuator arm 140, i.e. the magnetic head 120 moves away from the disc 110, so as to raise the position of the magnetic head 120, i.e. raise the flying height of the magnetic head 120; further, the problem that the magnetic head 120 scratches the disc 110 and damages the magnetic head 120 and the disc 110 in the high altitude area is solved. In addition, the lower magnetic head 120 may cause that the magnetic disk cannot accurately store information, and in this embodiment, the flying height of the magnetic head 120 may be increased, so that when the hard disk is used in a high altitude area, the magnetic head 120 may read and write information on the disc 110, so that the hard disk may store information in the high altitude area.

When the hard disk is used in a low altitude area, the deformation device 130 is not required to be started or the deformation device 130 is required to be closed. Wherein, in the case of closing the deformation device 130, the deformation device 130 may lower the second end 142 of the actuator arm 140 so that the magnetic head 120 is restored to the original state; the initial state may be understood as a position of the magnetic head 120 when the hard disk is used in a low altitude area (e.g., marked with atmospheric pressure) and the hard disk may store information (e.g., the magnetic head 120 reads and writes information on the rotating disc 110). Thus, the hard disk can be used in low altitude areas, so that the magnetic disk stores information; the flying height of the magnetic head 120 can be adjusted to avoid the problem of damaging the magnetic head 120 and the disk 110 when used in a high altitude area.

In some examples, because first end 141 of actuator arm 140 is rotatably disposed within disc 100, first end 141 of actuator arm 140 does not follow deformation device 130, i.e., first end 141 does not move to a side facing away from disc 110; in this way, the second end 142 of the actuator arm 140 may follow the movement of the deformable member 130. Wherein the actuator arm 140 (e.g., at the center of gravity of the actuator arm 140) between the first and second ends 141, 142 may also move with the deformation device 130.

Illustratively, the deformation device 130 may also be a piezoelectric device that is capable of deforming along the length of the actuator arm when energized. In some examples, the piezoelectric device may be a piezoelectric ceramic sheet, e.g., the piezoelectric ceramic sheet may be a contracted piezoelectric ceramic sheet (may also be referred to as a contracted piezoelectric ceramic sheet); for another example, the piezoelectric ceramic sheet may be an expansion type piezoelectric ceramic sheet (may also be referred to as an expansion type piezoelectric ceramic sheet). In other examples, the piezoelectric device may also be a piezoelectric crystal or a piezoelectric polymer, or the like.

Also by way of example, the deformation device 130 may be a mechanical device with deformation capability that moves the second end 142 of the actuator arm 140 along the rotational axis of the disc 110 toward a side away from the disc 110. For example, the mechanical device may be a spring and a telescopic structure, the spring is fixed on the actuating cantilever, the fixed end of the telescopic structure is fixed on the first end, and the telescopic end of the telescopic structure is fixed on one side of the spring close to the second end. Under the condition that the telescopic end is contracted, the elastic piece is deformed, and the elastic piece drives the second end 142 of the execution cantilever 140 to move along the rotation axis of the disc 110 to a side far away from the disc 110. The structure of the mechanical device is not limited.

Various embodiments are provided below for the purpose of adjusting the head 120.

Scheme one

Referring to fig. 6, when the hard disk is used at a high altitude, the flying height of the magnetic head 120 is lowered, and the second end 142 of the suspension 140 is moved toward the disk 110 side. To raise the second end 142 of the actuator arm 140, the control circuit 20 controls the shape changing device 130 to be able to contract in the length direction of the actuator arm 140. Specifically, the control circuit 20 applies an electrical signal to a piezoelectric device (e.g., a contracted piezoelectric ceramic sheet). The piezoelectric device (e.g., a contracted piezoelectric ceramic sheet) is configured to contract in a direction parallel to the length direction of the actuating cantilever 140 according to the received electrical signal; for example, a piezoelectric device (e.g., a contracted piezoelectric ceramic sheet) may contract in the K direction as shown in fig. 6.

Also, the deformation device 130 (e.g., a contracted piezoelectric ceramic sheet) is fixedly disposed on a side of the actuating cantilever 140 facing away from the disc 110, for example, may be fixedly disposed on an upper surface of the actuating cantilever 140 as shown in fig. 6. In this way, the force of the deforming member 130 due to the contraction acts on the upper surface of the actuator arm 140, so that the actuator arm 140 is bent upward, thereby raising the second end 142 of the actuator arm 140 and thus increasing the flying height of the magnetic head 120. In addition, when the flying height is increased, the magnetic head 120 can read and write information, and thus, the magnetic disk can be used in a high altitude area.

When the hard disk is used in a low altitude area, the deforming device 130 is turned off by the control circuit 20. Specifically, in the case where the piezoelectric device (e.g., the contracted piezoelectric ceramic sheet) does not receive the electric signal, the piezoelectric device (e.g., the contracted piezoelectric ceramic sheet) is powered down, for example. So that the piezoelectric device (such as a contracted piezoelectric ceramic sheet) recovers its deformation; thereby lowering the second end 142 of the actuator arm 140 so that the magnetic head 120 returns to the original state. Thus, the hard disk can be used in a low-altitude area and also in a high-altitude area, and the magnetic head 120 does not scratch the disk 110 when used in a high-altitude area.

The deformation device 130 may be attached to the actuator arm 140. For example, the deformation device 130 may be attached to the side of the actuator arm 140 facing away from the disc 110. The deformation device 130 may be attached to the upper surface of the actuating cantilever 140 as shown in fig. 6. The connection between the deformation device 130 and the execution cantilever 140 can be realized quickly by adopting a pasting mode, so that the cost is reduced.

In some examples, all portions of the deformation device 130 are affixed to the actuator arm 140. In other examples, one portion of the deformation device 130 is attached to the actuator arm 140 and another portion is attached to the disc 100; in this way, the deformation device 130 may also adjust the position of the second end 142 of the actuator arm 140 higher.

For convenience of description hereinafter, the deformation device 130 in the first embodiment may be referred to as a first deformation device 131.

Scheme II

Referring to fig. 7, when the hard disk is used at a high altitude, the flying height of the magnetic head 120 is lowered, and the second end 142 of the suspension 140 is moved toward the disk 110 side. To raise the second end 142 of the actuator arm 140, the deformation device 130 is capable of expanding in a direction parallel to the length of the actuator arm 140. Specifically, the control circuit 20 applies an electrical signal to a piezoelectric device (e.g., an inflated piezoelectric ceramic sheet). The piezoelectric device (e.g., an expanding piezoelectric ceramic sheet) is configured to expand in a direction parallel to the length of the actuating cantilever 140 in accordance with the received electrical signal; for example, a piezoelectric device (e.g., an expanding piezoelectric ceramic sheet) may expand in the direction P as shown in fig. 7.

Also, the deformation device 130 (e.g., an expanded piezoelectric ceramic sheet) is fixedly disposed on a side of the actuating cantilever 140 near the disc 110, for example, may be fixedly disposed on a lower surface of the actuating cantilever 140 as shown in fig. 7. In this way, the force of the expansion of the deformable member 130 acts on the lower surface of the actuator arm 140, so that the actuator arm 140 is bent upward, thereby raising the second end 142 of the actuator arm 140 and thus increasing the flying height of the magnetic head 120. In addition, when the flying height is increased, the magnetic head 120 can read and write information, and thus, the magnetic disk can be used in a high altitude area.

When the hard disk is used in a low altitude area, the deforming device 130 is turned off by the control circuit 20. Specifically, in the case where the piezoelectric device (e.g., the swelling piezoelectric ceramic sheet) does not receive the electric signal, the piezoelectric device (e.g., the swelling piezoelectric ceramic sheet) is powered down, for example. So that the piezoelectric device (such as an expanded piezoelectric ceramic sheet) recovers its deformation; thereby lowering the second end 142 of the actuator arm 140 so that the magnetic head 120 returns to the original state. Thus, the hard disk can be used in a low-altitude area and also in a high-altitude area, and the magnetic head 120 does not scratch the disk 110 when used in a high-altitude area.

The deformation device 130 may be attached to a side of the actuator arm 140 adjacent to the disc 110. For example, the deformation device 130 is attached to the lower surface of the actuating cantilever 140 as shown in fig. 7. The manner, position and effect of the bonding of the deforming device 130 to the cantilever 140 may refer to the manner, position and effect of the bonding of the deforming device 130 to the cantilever 140 in the first embodiment, and will not be described again.

For convenience of description hereinafter, the deformation device 130 in the second embodiment may be referred to as a second deformation device 132.

Scheme III

Referring to fig. 8, the hard disk may include a first deformation device 131 and a second deformation device 132. The position and connection of the first deformable member 131 can refer to the deformable member 130 in the first embodiment; the location and connection of the second deformable device 132 may refer to the deformable device 130 in scheme two; and will not be described in detail.

In some examples, when the hard disk is used at high altitude, the flying height of the magnetic head 120 is reduced, and the second end 142 of the suspension 140 is moved toward the disk 110 side. To raise the second end 142 of the actuator arm 140, the control circuit 20 controls one of the first deforming means 131 and the second deforming means 132 to deform, the other not to deform.

Specifically, referring to fig. 8, the control circuit 20 applies an electrical signal to one of the first deformation device 131 (e.g., a piezoelectric device) and the second deformation device 132 (e.g., a piezoelectric device). Such that one of the first deformation device 131 and the second deformation device 132 receives an electrical signal (e.g., gets electricity); while the other does not receive an electrical signal (e.g., is powered down or not powered on) as a spare deformation device 130. The working principle of the first deforming device 131 may refer to the deforming device 130 in the first embodiment; the working principle of the second deformable device 132 may refer to the deformable device 130 in the second embodiment. Then one of the first deformation device 131 and the second deformation device 132 raises the second end 142 of the actuator arm 140 and the second end 142 of the actuator arm 140 raises the flying height of the magnetic head 120. The other of which may also follow the second end 142 of the actuating cantilever 140.

When the hard disk is used in a low altitude area, the first deformation device 131 and the second deformation device 132 are turned off by the control circuit 20, that is, in the case that the first deformation device 131 and the second deformation device 132 do not receive the electric signals, for example, the first deformation device 131 and the second deformation device 132 are powered off. Causing the first deforming means 131 and the second deforming means 132 to resume deformation; thereby lowering the second end 142 of the actuator arm 140 so that the magnetic head 120 returns to the original state.

Thus, the first deforming member 131 and the second deforming member 132 in the third embodiment can exert the same effect as the deforming member 130 in the first embodiment. In addition, in the case where one of the first and

second deformation devices

131 and 132 fails, the other can be used, so that the problem that the head 120 cannot be raised due to failure in the case where one deformation device 130 is used can be avoided.

In other examples, when the hard disk is used at high altitude, the flying height of the magnetic head 120 is lowered, and the second end 142 of the suspension 140 is moved toward the disk 110 side. To raise the second end 142 of the actuator arm 140, see fig. 8, the control circuit 20 applies an electrical signal to both the first deformation device 131 and the second deformation device 132. So that the first and

second deformation devices

131 and 132 receive the electrical signals at the same time, i.e., the first and

second deformation devices

131 and 132 simultaneously raise the second end 142 of the actuator arm 140, so that both can simultaneously raise the magnetic head 120.

In some possible implementations, the first deformation device 131 may be a contracting piezoelectric ceramic tile. The second deformation device 132 may be an expanding piezoelectric ceramic wafer.

Referring to fig. 9, along the length direction of the actuating cantilever 140, the distance between one end of the deformation device 130 and the first end 141 of the actuating cantilever 140 is D1, and the distance between the other end of the deformation device 130 and the second end 142 of the actuating cantilever 140 is D2. The deformation device 130 is disposed at the middle of the actuating cantilever 140; meaning that both D1 and D2 are 0 or more. Illustratively, d1=d2=0, i.e., both ends of the deformation device 130 are flush with the first and second ends 141 and 142, respectively. Also illustratively, D1 and D2 are both greater than 0, and in some examples, D1 and D2 are equal. In other examples, D1 and D2 are not equal, e.g., D1 is greater than D2, and e.g., D1 is less than D2.

Referring to fig. 10, the control circuit 20 may include: interface controllers, buffer memory, read channels (PRML read channels), microprocessors, preamplifiers, timing application specific integrated circuits, servo demodulators, digital signal processors, positioning drives, spindle drives, and the like. The interface controller is connected with the buffer storage, the host, the reading channel (PRML reading channel) and the microprocessor; the read channel is connected with the pre-amplifier and the timing special integrated circuit; the microprocessor is connected with the digital signal processor and the timing special integrated circuit; the digital signal processor is electrically connected with the positioning driver and the main shaft driver; the servo demodulator is connected with the pre-amplifier, the timing special integrated circuit and the digital signal processor.

The working principle of the control circuit is as follows:

the microcontroller sends a first signal for rotating the spindle motor and a second signal for searching for the rotation of the driving motor to the digital signal processor through the timing professional integrated circuit and the servo demodulator.

The spindle driver is electrically connected to the spindle motor 160. The spindle driver is configured to drive the spindle motor 160 to rotate according to the received first signal, and the spindle motor 160 drives the disc to rotate. The positioning driver is electrically connected with the seek servo motor 150; the positioning driver is configured to drive the seek servo motor 150 to rotate according to the received second signal, and the seek servo motor 150 drives the actuator arm to rotate, so that the magnetic head 120 disposed at the second end of the actuator arm reads and writes information on the rotating disc.

The pre-amplifier is electrically connected to the magnetic head 120; the signal from the head 120 to read information from the disc is amplified by the pre-amplifier and transmitted via the read channel to the interface controller, which stores the read information in a buffer or transmits it to the host.

The signal to write information transfers interface control from the buffer storage or host. The interface control is fed to the guard amplifier via the read channel and amplified by the pre-amplifier so that the signal for writing information by the head 120 is written on the disc.

In some embodiments, referring to fig. 11, the control circuit 20 may include a first switch 210 and a power supply 200. The first switch 210 may be a switch having an on-off function, such as a tact switch, a micro switch, etc.; i.e., the first switch 210 has functions of being turned on and off. The first switch 210 has a first state and a third state; the first state may be understood as a state when the first switch 210 is opened, and the third state may be understood as a state when the first switch 210 is closed.

The power supply 200 is connected in series with the deformation device 130 and the first switch 210. When the hard disk is used in a high altitude area, for example, an operator can open the first switch 210, that is, the first switch 210 is in the first state, so that the deformation device 130 is connected to the power supply 200; the deformation device 130 deforms. So that the deformation member 130 can adjust the position of the second end in the rotational axis direction of the disc; and thereby the flying height of the magnetic head 120 is increased. The first switch 210 is provided at the outside of the tray 100 to facilitate the operation. In this way, the flying height of the magnetic head 120 is not only increased, so that the magnetic head 120 does not scratch the disk; meanwhile, the magnetic head 120 of the hard disk can read and write information on the rotating disk, so as to achieve the aim of storing information. Thus, the hard disk can be used in a low-altitude area and also can be used in a certain high-altitude area.

In this embodiment, the height of the deformable member 130 (i.e. the height of the magnetic head 120) can be adjusted according to a specific altitude, i.e. it can be obtained through continuous experiments how much the deformable member 130 can be adjusted in a certain high altitude area. Wherein, in the high altitude area, the higher the altitude, the larger the deformation amount of the deformation device 130. For example, in the first high-altitude area, the deformation amount of the deformation device 130 is M1, and in the second high-altitude area, the deformation amount of the deformation device 130 is M2, and since the altitude of the first high-altitude area is greater than that of the second high-altitude area, M1 is greater than M2.

In some embodiments, referring to fig. 12, the control circuit 20 includes a second switch 220 and a controller 230. Wherein the controller 230 may be a microprocessor as shown in fig. 10. The second switch 220 has a second state and a fourth state. The controller 230 is electrically connected to both the second switch 220 and the deformation device 130, and the controller 230 is configured to control the deformation device 130 to deform when the second switch 220 is in the second state. In some examples, the second switch 220 may be an on-off type switch. The second state may be understood as a state when the second switch 220 is opened, and the fourth state may be understood as a state when the second switch 220 is closed.

When the hard disk is used in a high altitude area, for example, an operator can open the second switch 220, that is, the second switch 220 is in the second state; the controller 230 controls the shape changing device 130 to adjust the position of the second end along the rotational axis of the disk, thereby increasing the flying height of the magnetic head 120 so that the magnetic disk can store information.

When the hard disk is used in a low altitude area, for example, an operator can close the second switch 220, that is, when the second switch 220 is in the fourth state, the controller 230 controls the deformation device 130 to recover the deformation, and the deformation device 130 can lower the second end of the execution cantilever 140, so that the magnetic head 120 is recovered to the initial state; the disk may store information.

In other examples, the second switch 220 may be an on-off and regulating switch, such as a regulating switch. Thus, the second switch 220 may have an adjustment state in addition to the second state and the fourth state. In the case where the second switch 220 is turned on, the second switch 220 is brought into an adjusted state by adjusting the second switch 220, thereby changing an electric signal (e.g., voltage, current, etc.) of the second switch 220. In the case where the second switch 220 is in the second state and the fourth state, reference may be made to the related description in the above example, and a detailed description is omitted.

When the hard disk is used in a high altitude area, an operator adjusts the second switch 220 by adjusting the second switch 220 under the condition that the second switch 220 is turned on, so that the second switch 220 is in an adjusting state to adjust the electric signal of the second switch 220. The controller 230 controls the deformation member 130 to adjust the position of the second end in the rotation axis direction of the disc according to the electric signal of the second switch 220. In this way, the controller 230 may cause the deformation device 130 to adjust the position of the second end differently according to receiving different adjustment status signals.

Specifically, the second switch 220 has a plurality of gear positions (referred to as a first gear position, a second gear position, a third gear position … …, etc.) that can be adjusted. When the second switch 220 is in each gear, the electrical signal received by the controller 230 from the second switch 220 is different; so that the height of the second end of the deformation means 130 is also different. Thus, in a high altitude area within a certain range, the corresponding gear of the second switch 220 may be used, so that the deformation device 130 may adjust the magnetic head 120 to a corresponding flying height.

The first gear, the second gear, the third gear … …, and the like may be sequentially increased. For example, when the second switch 220 is in the first gear, the electrical signal of the second switch 220 received by the controller 230 is smaller than when the second switch 220 is in the second gear, the electrical signal of the second switch 220 received by the controller 230. So that when the second switch 220 is in the first gear, the height of the magnetic head 120 is adjusted by the deformation device 130 to be smaller than that when the second switch 220 is in the second gear, the height of the magnetic head 120 is adjusted by the deformation device 130. Of course, the first gear, the second gear, the third gear … …, and the like may be sequentially decreased.

The second switch 220 is provided at the outside of the tray 100 to facilitate the operation.

In some embodiments, the control circuit 20 is electrically connected to the magnetic head 120; the preamplifier in the control circuit 20, for example as shown in fig. 10, is electrically connected to the magnetic head 120. The control circuit 20 is configured to control the deforming device 130 to be powered on or powered off according to the strength of the magnetic signal sent by the magnetic head 120. The deformation device 130 may be connected to a positioning driver as shown in fig. 10.

When the hard disk is used in a high-altitude area, the magnetic head 120 is lower, so that a magnetic signal sent by the magnetic head 120 is stronger, the control circuit 20 controls the deformation device 130 to be continuously electrified according to the stronger magnetic signal, so that the deformation device 130 can be used for heightening the position of the second end along the rotation axis of the disk, and the flying height of the magnetic head 120 is heightened. The magnetic head 120 is maintained at the flying height so that the magnetic head 120 can continuously read and write information on the disk so that the disk can store information in a high altitude area.

When the hard disk is used in a low-altitude area, the magnetic head 120 is higher, so that a magnetic signal sent by the magnetic head 120 is weaker, the control circuit 20 controls the deformation device 130 to lose electricity according to the received weaker magnetic signal, and the deformation device 130 can regulate down the second end of the execution cantilever 140, so that the magnetic head 120 is restored to an initial state; so that the magnetic disk can store information in a low altitude area.

In some embodiments, referring to FIG. 13, the control circuit 20 is electrically connected to the magnetic head 120; the preamplifier in the control circuit 20, for example as shown in fig. 10, is electrically connected to the magnetic head 120. The control circuit 20 is configured to control the deforming device to deform (e.g., deform accordingly) according to the strength of the magnetic signal sent by the magnetic head 120, so that the deforming device 130 adjusts the second end to approach or depart from the disc along the rotation axis of the disc. The deformation device 130 may be connected to a positioning driver as shown in fig. 10.

When the hard disk is used in different high-altitude areas, the lower degree of the magnetic head 120 is different, so that the magnetic signal intensity emitted by the magnetic head 120 is different, the control circuit 20 controls the deformation device 130 to continuously power on according to the received magnetic signals with different intensities, so that the deformation device 130 can be adjusted to be different in the position of the second end along the rotation axis of the disk, and the flying height of the magnetic head 120 is different. And the magnetic head 120 can continuously read and write information on the disk at any flying height of the magnetic head 120, so that the disk can be used in different high-altitude areas.

In some examples, with continued reference to fig. 13, the control circuit 20 is configured to loop through: in the case where the amplitude of the received magnetic signal emitted from the magnetic head 120 is greater than the threshold value, the deformation of the deformation device 130 is controlled to be increased so that the deformation device 130 moves in a direction away from the disc until the amplitude of the received magnetic signal emitted from the magnetic head 120 is less than or equal to the threshold value. In this way, the flying height of the magnetic head 120 can be gradually increased by the deforming device 130.

Wherein, referring to fig. 14, the amplitude of the solid magnetic signal is greater than the amplitude of the dashed magnetic signal; i.e. the dashed line has a magnetic signal amplitude smaller than N and the solid line has a magnetic signal amplitude larger than N. The solid line shown in fig. 14 indicates the flying height of the magnetic head 120 when the magnetic head 120 can read and write information on the disk and the hard disk can store information. The broken line shown in fig. 14 indicates that the flying height of the magnetic head 120 is lowered so that the magnetic signal transmitted from the magnetic head 120 is enhanced, and at this time, the hard disk is defective in storing information or is unable to store information.

When the hard disk is used in different high altitude areas, the magnetic heads 120 have different lower degrees, so that the magnetic signal intensity emitted by the magnetic heads 120 is different. In the case where the amplitude of the magnetic signal emitted by the magnetic head 120 is greater than the threshold value, the control circuit 20 may provide an electrical signal that gradually increases to the deforming device 130, so that the deforming device 130 may gradually adjust the flying height of the magnetic head until the information read and written by the magnetic head on the disc can be completely stored. The electrical signal, which is continued by the control circuit 20 at this time, is supplied to the deformation device 130 so that the flying height of the magnetic head 120 remains unchanged.

The above is merely a specific embodiment of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art who is skilled in the art, who is disclosed the disclosure, thinks about the change or substitution, should be covered in the protection scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A hard disk comprising:

a tray body having an air passage;

a disc rotatably disposed within the disc body;

an actuator arm having elasticity and including a first end and a second end; the first end is arranged in the tray body;

a magnetic head disposed on the second end;

the deformation device is fixed on the execution cantilever and can deform to drive the second end of the execution cantilever to displace along the rotation axis of the disc at one side far away from the disc; the method comprises the steps of,

and the control circuit is electrically connected with the deformation device and is used for controlling the deformation device to deform.

2. The hard disk of claim 1, wherein,

the deformation device is a piezoelectric device, and the piezoelectric device can deform along the length direction of the execution cantilever under the condition of electrifying.

3. The hard disk of claim 1, wherein,

the deformation device is fixedly arranged on one side of the execution cantilever, which is away from the disc; the deformation device can shrink along the length direction of the execution cantilever;

or alternatively, the process may be performed,

the deformation device is fixedly arranged on one side of the execution cantilever close to the disc; the deformable member is capable of expanding in a direction parallel to the length of the actuator arm.

4. The hard disk of claim 1, wherein,

the deformation device is arranged in the middle of the execution cantilever.

5. The hard disk of claim 1, wherein the control circuit comprises:

the first switch is arranged outside the tray body and is provided with a first state;

the power supply is connected with the deformation device and the first switch in series;

and under the condition that the first switch is in the first state, the first switch conducts the deformation device with the power supply so as to deform the deformation device.

6. The hard disk of claim 1, wherein the control circuit comprises:

the second switch is arranged outside the tray body and is in a second state;

And the controller is electrically connected with the switch and the deformation device and is configured to control the deformation device to deform under the condition that the second switch is in the second state.

7. The hard disk of claim 1, wherein,

the control circuit is electrically connected with the magnetic head;

the control circuit is configured to control the deformation device to be powered on or powered off according to the strength of the magnetic signal sent by the magnetic head.

8. The hard disk of claim 1, wherein,

the control circuit is electrically connected with the magnetic head;

the control circuit is configured to control the deformation device to deform according to the strength of the magnetic signal sent by the magnetic head, so that the deformation device can adjust the second end to approach or depart from the disc along the rotation axis of the disc.

9. The hard disk of claim 8, wherein,

the control circuit is configured to loop execution: and under the condition that the amplitude of the received magnetic signal sent by the magnetic head is larger than a threshold value, increasing and controlling the deformation of the deformation device, so that the deformation device moves in a direction away from the disc until the amplitude of the received magnetic signal sent by the magnetic head is smaller than or equal to the threshold value.

10. An electronic device, comprising:

the hard disk of any one of claims 1 to 9; the method comprises the steps of,

and a circuit board assembly configured to store data in the hard disk or read data in the hard disk.