JPH06176555A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To obtain a magnetic disk device improving reliability with high impact resistance. CONSTITUTION:When a user lets the magnetic disk device fall erroneously, shock is diminished by shock absorbing members 16 attached to the four corner parts of a frame 2 and shock absorbing members 18 attached to the both end parts 20a of a connector accepting part 20, then the damage of respective mechanical parts is prevented. Also, the projecting shock absorbing members 18 attached in the neighbourhood of the both end parts 20a of the connector accepting part 20 is structured so as to freely extend and contract and the members 18 do not prevent the connector from attaching and detaching because the members 18 are fixed while retreating at the time of attaching to an external device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device having improved impact resistance.

[0002]

2. Description of the Related Art For example, when connecting to a conventional magnetic disk device capable of recording and reproducing digital information on a magnetic disk, particularly an external device, the magnetic disk is connected to a connection terminal for a memory card provided in the external device. In a small-sized (for example, 1.8-inch size) magnetic disk device (see FIG. 13) compatible with a memory card to which the device can be directly connected, there is a frame 38 formed of a rigid plate in a rectangular parallelepiped shape. A magnetic disk 40 for magnetically recording information is incorporated therein. When recording / reproducing information on / from the magnetic disk 40, the head assembly 42 is driven, and the recording / reproducing operation is performed by the magnetic head provided at the tip of the head assembly 42. In addition, by the spindle motor 44,
The magnetic disk 40 is rotationally driven, and the head portion of the head assembly 42 is floated by the airflow caused by the rotation, and magnetic information is recorded on the magnetic disk 40 from the head portion. On the lower surface of the frame 38, a printed circuit board 46 on which various circuits for controlling the drive of the spindle motor 44 and the head unit and the head assembly 42 are mounted, and the printed circuit board 46 is surrounded by the printed circuit board 46. A printed circuit board frame 48 (hereinafter referred to as a PCB frame) having guide grooves 47 formed in the vicinity of a portion matching both connector end portions 46a of the printed circuit board 46.
Printed circuit board cover 50 provided so as to cover the lower surface of the
(PCB covers) are attached by screws, respectively, and these form the main body of the magnetic disk device.

In such a magnetic disk device,
For example, a mechanism section that considers impact resistance such as prevention of damage due to dropping of the apparatus is provided inside the apparatus body. That is, the impact may damage the magnetic disk inside the main body. When the magnetic disk is damaged, the flying state of the head part is disturbed, the magnetic disk and the head part come into contact with each other, and more damage occurs, which may destroy the recorded data. In order to prevent such a state, the mechanical section is provided so as to prevent unnecessary contact between the magnetic disk and the head section and prevent the magnetic disk from being scratched.

One of the mechanical parts is, for example, a ramp load mechanism. The ramp load mechanism is as shown in FIG. That is, the rotation of the magnetic disk 40 is stopped when the apparatus is stopped. At this time, the head portion 52 is moved to the ramp load 54 adjacent to the outer peripheral portion of the magnetic disk 40 to fix the head portion 52 before the head portion 52 loses the floating force due to the air flow. It is a thing. Since the head portion 52 moves along the ramp load 54, it can be smoothly moved to the fixed position.

Similarly, as a means for fixing the head portion, there is a carriage lock mechanism. This is to move the head portion to a predetermined position on the inner circumference side of the magnetic disk when the apparatus is stopped, and to keep the head portion fixed by a magnet attached to the head assembly. On the inner circumference side of the magnetic disk, a contactable portion between the magnetic disk and the head section is provided as a dedicated area (contact start / stop zone) for fixing the head section to a fixed part, not an area for reproducing and recording data. ing.

[0006]

The small magnetic disk drive compatible with the memory card as described above may be carried by itself. There is a risk that the product may be accidentally dropped due to this transportation.

In the conventional magnetic disk drive, as described above, the ramp load mechanism or the carriage lock mechanism has been designed in consideration of the shock resistance of the mechanism inside the device against the impact at the time of dropping. However, this alone is not sufficient for absorbing the shock, and there is still a possibility that the internal mechanism of the device, especially the magnetic disk may be damaged. Moreover, when the printed circuit board and the frame are impacted, the connector portion is often damaged. Since the connector portion is exposed to the outside of the frame, it is the most vulnerable to impact, and when it receives an impact, the printed circuit board may be broken or the wiring of the printed circuit board may be cut. If the printed circuit board is damaged, the device will not operate normally. It should be noted that no means has been conventionally taken to deal with an impact received when the connector section and the external device are connected. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a magnetic disk device having excellent impact resistance and improved reliability.

[0008]

In order to achieve the above-mentioned object, the present invention has a printed circuit board on which various control circuits and the like are mounted and which is connected to the printed circuit board and is provided with a connection portion with external equipment. And a main body formed in a substantially rectangular parallelepiped shape,
A magnetic disk that is provided in the main body, magnetically divides a disk-shaped magnetic medium to add address information and records various information, and a control provided in the main body and mounted on the printed circuit board. A signal for writing or reading the information on or from the magnetic disk, which is driven and controlled by a circuit to drive the magnetic disk to rotate and a spindle motor which is driven and controlled by a control circuit mounted on the printed circuit board. It is an object of the present invention to provide a magnetic disk device including a head assembly that includes a head unit that converts a current into a magnetic field or a magnetic flux into a signal voltage, and a buffer member that is provided outside the main body and that damps shocks.

In order to achieve the above object, the present invention also provides a magnetic disk device in the above magnetic disk device, in which expandable and contractible cushioning members are provided at both ends of an external connection terminal provided on a printed circuit board. Especially.

[0010]

In the present invention, the shock-absorbing member absorbs and attenuates shocks such as dropping, so that damage to the mechanical portion inside the main body can be reduced and damage can be prevented.

[0011]

【Example】

 First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a magnetic disk device according to the present invention.
In particular, the disassembly showing the schematic configuration of a small-sized (for example, 1.8-inch size) magnetic disk device compatible with a memory card so that the magnetic disk device can be directly connected to a connection terminal for a memory card provided in an external device It is a perspective view. The apparatus has a rectangular parallelepiped frame 2 formed of a rigid plate. Inside this, there is a magnetic disk 4 for magnetically dividing the surface of a disk-shaped magnetic medium and giving an address or the like to record digital information. Further, a spindle motor 8 that rotationally drives the magnetic disk 4 is provided in the frame 2. A head assembly 6 having a head portion having a function of converting a signal current into a magnetic field or a magnetic flux into a signal voltage for writing or reading the information on the magnetic disk 4 is provided in the frame 2. ing.

A printed circuit board 10 on which various circuits for controlling the drive of the spindle motor 8 and the head section and the head assembly 6 are mounted on the lower portion of the frame 2 and the outer periphery of the printed circuit board 10. A printed circuit board frame 12 having a cover groove and a guide groove 11 formed therein.
A PCB frame (hereinafter referred to as a PCB frame) and a printed circuit board cover 14 (hereinafter referred to as a PCB cover) provided on the lower surface of the printed circuit board 10 are attached by screws, respectively, and these form the main body of the magnetic disk device. And
As a shock absorber, cushioning members 16 are attached to the four corners of the frame 2 with an adhesive. Similarly, a cushioning member 18 protruding from the main body is attached near both end portions 20a of the connector receiving portion 20. 2 is a top view of the magnetic disk device according to the present invention, FIG. 3 is a side view of FIG. 2, and FIG.
FIG.

As shown in FIGS. 2, 3 and 4, a frame 2 which is a portion where three adjacent planes overlap each other at a right angle.
A cushioning member 16 made of a member having a high damping characteristic (for example, synthetic rubber) is attached to the four corners of the with an adhesive. Further, cushioning members 19 are also attached near the four corners of the bottom surface of the PCB cover 14 that surrounds the printed circuit board 10. In short, the cushioning members 16 and 19 are arranged at the four corners of the magnetic disk device body so as to avoid direct impact on the surface of the magnetic disk device. Furthermore, the PCB frame 1 that matches both ends 20a of the connector receiving portion 20
The buffer member 18 is provided at the portion 2 so as to project to the outside. The protruding cushioning member 18 is shown in a perspective view in FIG. FIG. 6 is an enlarged schematic view of the inside of the portion A of FIG.

P near both ends 20a of the connector receiving portion 20
The CB frame portions 12a and 12b are provided with attachment portions to which the cushioning member 18 is attached. The cushioning member 18 has a front portion made of a rigid cushioning member 18a and a notch 22 formed therein. And a rigid cushioning member 18a
At the rear, soft cushioning member 18 attached with adhesive
b is provided. The soft cushioning member 18b is adhered to the PCB frame 12 at the rear portion. A cutout portion 22 is formed behind the rigid cushioning member 18a,
An engaging piece 26 made of a material having elasticity is configured to engage. A guide portion 26a formed at the rear portion of the engagement piece 26 is attached to the frame 2 of the guide groove portion by being adhered thereto. The operation of the above configuration will be described below.

When the magnetic disk device as described above is dropped, the outer surface of the magnetic disk device collides with the floor surface or the like in any case.
In this case, in the magnetic disk device according to the present invention, the respective cushioning members 16, 18, 19 first collide with the floor surface to damp the shock and prevent various internal mechanical parts, especially the magnetic disk 4, from being damaged. Even if the connector receiving portion 20 falls down with respect to the main body of the apparatus, the protruding cushioning member 1
8 collides with the floor first to damp the impact,
Various mechanical parts of the magnetic disk device, especially the connector receiving part 20
Protects the printed circuit board 10. Next, the action of the buffer member 18 attached to both ends 20a of the connector receiving portion 20 when the connector receiving portion 20 is inserted into the external terminal will be described with reference to the drawings.

FIG. 7 is a top view showing the structure around the buffer member 18, and FIG. 8 is a top view after inserting the connector receiving portion 20 into the external terminal. 7 and 8 are the same as FIG.
It is a sectional view cut in the BB 'direction.

When inserting the magnetic disk device according to the present invention into an external device, among the cushioning members 18 exposed to the outside of the main body, the soft cushioning member 18b attached to the rear portion is
For example, it is pressed and urged by the connector 30 of the expansion slot of the computer to be compressed, and both ends 2 of the connector receiving portion 20 are compressed.
It is stored in the space provided in the frame 2 near the portion 0a. At this time, the guide groove 11 is guided by the guide rail 32 of the expansion slot, and the guide rail 32 hits the engaging piece 26 when the rigid cushioning member 18a is housed substantially in the frame 2. When the engagement piece 26 is pushed by the guide rail 32, the engagement piece 26 is biased and stored in the cutout portion 22. The engaging piece 26 engaged with the cutout portion 22 is in close contact with and fixed to the cushioning member 18a, and the elastic force of the cushioning member prevents the connector portion from coming off. When the magnetic disk device inserted into the external device is removed, the engagement piece 26 is restored, and the cushioning member 18 stored in the frame 2 retreats and returns to the state of being projected and exposed to the outside of the main body.

According to the first embodiment, when the magnetic disk device is dropped, the shock absorbing member 18 absorbs the shock and protects various mechanical parts. Further, when the connector is connected, the cushioning member 18 is in close contact with the expansion slot due to its own elasticity and prevents the vibration of the magnetic disk device. In addition, even if the computer having the magnetic disk device built therein is accidentally dropped, the magnetic disk device is similarly protected from an impact. Therefore,
The original function of the magnetic disk device can be maintained, and the reliability can be improved. Further, since the cushioning member 18 projects and retracts when attaching and detaching the external device and the external connection terminal, there is no obstacle to the attachment and detachment. In addition, it is possible to prevent unnecessary force from being applied when attaching and detaching. Example 2

A magnetic disk device mounted on the PCB frame and the PCB cover and having a simplified cushioning member in the first embodiment will be described as a second embodiment. Further, the same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. 9 is a plan view of the magnetic disk device according to the present invention, FIG. 10 is a side view of FIG. 9, and FIG. 11 is a front view of FIG.

As shown in FIGS. 9, 10 and 11, cushioning members 16 are attached to the four corners of the frame 2 where three adjacent planes are overlapped at a right angle with adhesive. In addition, both ends 20a at the rear of the PCB frame 12
A buffer member 34 is attached to the. A buffer member 36 is adhered to both ends of the connector receiving portion 20 so as to cover the connector receiving portion, so that the guide groove 11 is exposed (see FIG. 12). The operation of the above configuration will be described below.

When the magnetic disk device as described above is dropped, the outer surface of the magnetic disk device collides with the floor surface or the like in any case.
In this case, in the magnetic disk device according to the present invention, the cushioning members 16, 34 and 36 first collide with the floor surface to damp the impact and prevent damage to various internal mechanical units.

According to the second embodiment, when the magnetic disk device is dropped, the shock absorbing member absorbs the shock and protects the various mechanical parts. Further, when the connector is connected, the cushioning member 36 is in close contact with the expansion slot by its own elasticity, and prevents vibration of the magnetic disk device. Further, even when a computer having the magnetic disk device built therein is accidentally dropped, the magnetic disk device can be similarly protected from an impact. Therefore, the original function of the magnetic disk device can be maintained, and the reliability can be improved. Further, by exposing the guide groove, there is no hindrance in connection and disconnection of the connector. In addition, it is possible to prevent unnecessary force from being applied when attaching and detaching. Further, the magnetic disk device can be easily assembled, particularly the buffer members 36 at both end portions of the connector receiving portion 20 can be easily attached.

[0024]

According to the present invention, by providing the cushioning member, it is possible to protect the mechanical portion of the apparatus from an external impact. Further, it has an excellent effect that reliability can be improved. Further, the cushioning members provided at both ends of the external connection terminal are useful because they can expand and contract when the external device is attached to and detached from the external connection terminal and do not hinder the attachment and detachment.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a schematic configuration of a magnetic disk device showing a first embodiment according to the present invention.

FIG. 2 is a top view of the magnetic disk device according to the embodiment.

FIG. 3 is a side view of FIG.

FIG. 4 is a front view of FIG.

FIG. 5 is a perspective view of a PCB frame of the magnetic disk device according to the embodiment.

FIG. 6 is an enlarged view of part A of FIG.

FIG. 7 is a sectional view of the structure around the cushioning member at both ends of the connector according to the embodiment, taken along line BB ′ in FIG. 5;

FIG. 8 is a sectional view of the structure around the buffer member after being connected to the connector according to the embodiment, taken along line BB ′ in FIG. 5;

FIG. 9 is a plan view of a magnetic disk device showing a second embodiment according to the present invention.

FIG. 10 is a side view of FIG. 9 according to the same embodiment.

FIG. 11 is a front view of FIG. 10 according to the same embodiment.

FIG. 12 is an enlarged perspective view around the buffer member at both ends of the connector according to the embodiment.

FIG. 13 is an exploded perspective view of a main part of a conventional magnetic disk device.

FIG. 14 is a side view schematically showing a ramp load mechanism.

[Explanation of symbols]

2 ... Frame, 4 ... Magnetic disk, 6 ... Head assembly, 8 ... Motor, 10 ... Printed circuit board, 11 ... Guide groove, 12 ... Printed circuit board frame (PCB frame),
14 ... Printed circuit board cover (PCB cover), 16 ... Buffer member, 17 ... Buffer member, 18 ... Buffer member, 20 ... Connector receiving portion, 22 ... Notch, 24 ... Buffer member, 26 ... Engaging piece, 30 ... Connector , 32 ... Guide rails, 34 ... Buffer member, 36 ... Buffer member, 38 ... Frame, 40 ... Magnetic disk, 42 ... Head assembly, 44 ... Spindle motor, 46 ... Printed circuit board, 47 ... Guide groove 48 ...
Printed circuit board frame (PCB frame), 50 ... Printed circuit board cover (PCB cover), 52 ... Head part, 5
4 ... Ramp Road.

Claims (2)

[Claims] 1. A main body formed in a substantially rectangular parallelepiped shape in which a printed circuit board on which various control circuits and the like are mounted is provided, which is connected to the printed circuit board and which is provided with a connection portion with an external device, A magnetic disk that is provided and magnetically divides a disk-shaped magnetic medium to add address information and records various information; and a control circuit that is provided in the main body and mounted on the printed circuit board. A spindle motor that drives the magnetic disk to rotate, and a drive circuit that is controlled by a control circuit mounted on the printed circuit board to apply a signal current to a magnetic field to write or read the information on the magnetic disk. Alternatively, a magnetic assembly including a head assembly including a head unit that converts magnetic flux into a signal voltage, and a shock absorbing member that is provided outside the main body and attenuates shocks. Disk device. 2. A magnetic disk drive according to claim 1, wherein a flexible cushioning member is provided at both end portions of the external connection terminal provided on the printed circuit board.