JPH0419677Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic disk device, and more particularly to improvements in a clean air circulation type magnetic disk device.

[Prior art]

Conventionally, a clean air circulation type magnetic disk device includes a housing, a magnetic disk rotatably provided in the housing, a magnetic head for writing and reading information to and from the magnetic disk, and a magnetic head provided in the housing. A known device is generally comprised of an air filter positioned in the air flow generated by the rotation of the magnetic disk to purify the air. In this type of magnetic disk device, an air filter is installed in the airflow generated by the rotation of the magnetic disk and circulated within the housing to remove dust from the airflow. There is.

Since filter paper is mainly used as the filter material in the air filter in the prior art described above, regardless of the nature of the dust, for example, whether it is made of metal, synthetic resin, etc., the particle size is larger than the pore size of the filter material. It has the advantage of being able to capture dust.

Incidentally, inside the housing of a magnetic disk device, abraded iron particles generated when each component is fastened to the housing body via screws are floating, and the magnetic head movement mechanism accompanying the operation of the magnetic disk device is floating. Various magnetic fine particles are generated, such as worn iron powder generated by the sliding of the guide rod and carriage, and magnetic metal powder peeled off from the surface of the magnetic disk due to the sliding contact of the magnetic head. Each of these magnetic fine particles circulates within the housing on an air current, and particles larger than a certain size are captured by an air filter.

Conventional air filters using filter paper are unable to actively capture fine particles smaller than the pore size, especially magnetic particles. Magnetic particles adhere to the magnetic head or the disk surface of the magnetic disk, which may lead to accidents such as magnetic recording reproduction errors and head crashes.

[Problem that the invention attempts to solve]

The present invention was developed in view of the above-mentioned shortcomings of the prior art.The problem that the present invention attempts to solve is to reliably capture magnetic particles floating inside the housing of a magnetic disk device, thereby preventing playback errors and destruction of magnetic recording. The aim is to prevent such accidents from occurring.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention
A housing with a sealed structure, a magnetic disk rotatably provided within the housing, a magnetic head for writing and reading information to and from the magnetic disk, and an air flow generated by the rotation of the magnetic disk. and an air filter located in the housing to purify the air in the air flow, the filter having a magnetizable and net-like particulate adsorption member that adsorbs magnetic particulates. It is characterized by being integrally provided so as to cover the air flow path.

[Effect]

With this configuration, the air flow path of the filter is covered with a magnetized and net-like particulate adsorption member, so that magnetic particles contained in the air flow are absorbed into the air flow path of the air filter. While the particles are flowing, they can be reliably captured by the particle adsorption member.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

In the figure, reference numeral 1 denotes a housing whose interior is sealed with a housing body 1A and a lid band (not shown) to prevent dust from entering. On the outside of the housing 1, there is an outer rotor type spindle, for example. A motor (not shown) is provided with a rotating shaft 2 protruding into the housing 1. Reference numeral 3 designates magnetic disks, and a plurality of magnetic disks 3 are provided at predetermined intervals in the axial direction of the rotary shaft 2 via disk mounting members 4.

5 is a magnetic head for writing and reading information to each magnetic disk 3; 6 is a linear magnetic head provided in the housing 1 for moving the magnetic head 5 in the radial direction of each magnetic disk 3; The magnetic head moving mechanism 6 is located outside the housing 1 and is driven by a stepping motor 7 provided in the housing body 1A.

8, 8, . . . are air circulation holes for blowing air flow A circulating in the housing 1 toward the disk surface of each magnetic disk 3, as described later, and each air circulation hole 8 is connected to the disk mounting member. 4 are located at equal intervals in the circumferential direction and axially perforated, the inlet 8A thereof opens on the upper surface of the disk mounting member 4, and the outlet (not shown) opens in the radial direction of each magnetic disk 3. It opens on the circumferential surface of the member 4 toward.

Reference numeral 9 denotes a guide plate for circulating the air flow A generated in the radial direction from the rotation center of each magnetic disk 3 toward the rotation center side by the rotation of each magnetic disk 3. The guide plate 9 has a flat bottom portion 9A having a width slightly shorter than the diameter of the disk mounting member 4 and a length slightly longer than the diameter of the magnetic disk 3, and a flat bottom portion 9A extending in the longitudinal direction along both widthwise edges of the bottom portion 9A. It has the shape of a shallow gutter consisting of integrally erected side wall portions 9B, 9B, with the middle portion of the side wall portion 9B on one side bulging out in a curved shape along the outer periphery of the disk mounting member 4, and the bottom portion 9A. A concavely curved opening 10 is formed along the outer periphery of the disk mounting member 4 . and,
The guide plate 9 is provided to protrude from the lower surface of the lid of the housing 1, and the lid and the guide plate 9 move the housing 1
An air flow passage 11 is formed along the radial direction of the magnetic disk 3 on the inner upper side. 12 is provided protrudingly on the former guide plate 9 to direct the air flow A in the air flow passage 11.
This is a guide member for guiding the disk toward the inlet 8A of the disk mounting member 4.

Reference numeral 13 denotes an air filter provided in the housing main body 1A, located in the air flow A in front of the tip of the guide plate 9 on the outside in the radial direction of the magnetic disk 3, and the air filter 13 has an opening on one side serving as an air inlet 14A; The opening on the other side facing the guide plate 9 is a horizontally long filter case 14 that serves as an air outlet (not shown).
and a filter material 15 made of filter paper provided inside the case 14 facing the air inlet 14A.

Next, reference numeral 16 denotes a magnetic particle adsorption member detachably attached to the filter case 14 so as to cover the air inlet 14A, in order to capture magnetic particles floating in the housing 1. The member 16 is made of a magnetized metal mesh formed in the same shape as one side of the filter case 14.

The magnetic disk device of this embodiment is constructed as described above, and in order to write information to or read information from the magnetic disk 3 using the magnetic head 5, the spindle motor is driven.
Rotate. Then, an air flow A having a wind speed of about 10 to 20 m/s is generated on the disk surface of the magnetic disk 3 in the radial direction from the center of rotation of the magnetic disk 3 based on the rotation. Therefore, the rotation center side of the magnetic disk 3 is in a negative pressure state, and the outer peripheral edge side of the magnetic disk 3 is in a high pressure state, and the air flow A circulates inside the housing 1 as shown in FIG. The air can be purified by an air filter 13 located at.

According to this embodiment, the air filter 13
Since the magnetic particulate adsorption member 16 is provided to cover the air inlet 14A, various magnetic particulates contained in the air flow can be attracted and captured by the adsorption member 16 before they flow into the air filter 13. can. Moreover, since the particle adsorption member 16 captures magnetic particles using magnetic force, it can reliably capture even magnetic ultrafine particles that cannot be captured by the filter paper 15 of the air filter 13. Since the attracted magnetic particles do not separate from the attracting member 16, the air inside the housing 1 can always be maintained in a clean state. Further, by periodically replacing the old particulate adsorption member 16 with a new particulate adsorption member 16, the adsorption power can be maintained. Furthermore, the particulate adsorption member 16 of this embodiment has a structure in which a metal net is magnetized, and this particulate adsorption member is provided perpendicular to the air flow so as to cover the air inlet 14A of the filter 13. Air inlet 14A
Magnetic particles can be captured over the entire surface of the air flow path, and the efficiency of capturing magnetic particles can be reliably improved compared to the case where a mere permanent magnet is disposed in the air flow path.

[Effects of the invention] As detailed above, according to the magnetic disk device according to the present invention, the filter provided in the housing has a magnetic property that attracts granular particles, and a net-like particulate adsorption member is attached to the air of the filter. Since it is configured to be integrally provided so as to cover the flow path, the following effects can be achieved.

Since the particulate adsorption member is provided so as to cover the air flow path of the filter, it is possible to reliably attract and capture magnetic particulates contained in the airflow that are difficult to capture with an air filter. Accidents such as magnetic recording reproduction errors and head crashes caused by adhesion of magnetic fine particles to the head or the disk surface of a magnetic disk can be prevented.

Since the particulate adsorption member is provided integrally with the filter, the adsorption force can be maintained by periodically replacing the old particulate adsorption member with a new particulate adsorption member, such as when replacing the filter paper of the filter.

The particulate adsorption member is constructed by magnetizing a net-like body, and since this particulate adsorption member is provided so as to cover the air flow path of the filter, it is possible to capture magnetic particulates over the entire surface of the air flow path. , it is possible to reliably improve the capturing efficiency of magnetic fine particles compared to the case where a mere permanent magnet is disposed in the air flow path.

[Brief explanation of drawings]

FIG. 1 shows a magnetic disk device according to an embodiment of the present invention, showing the flat part with the lid removed, and the second part with the lid removed.
The figure is an external perspective view showing a filter case and a particulate adsorption member. 1...Housing, 3...Magnetic disk, 5...
...Magnetic head, 13...Air filter, 16...
Particulate adsorption member, A...air flow.

Claims (1)

[Scope of utility model registration request] A housing with a sealed structure, a magnetic disk rotatably provided within the housing, a magnetic head for writing and reading information to and from the magnetic disk, and an air flow generated by the rotation of the magnetic disk. and an air filter located in the housing to purify the air in the air flow, the filter having a magnetizable and net-like particulate adsorption member that adsorbs magnetic particulates. A magnetic disk device characterized by being integrally provided so as to cover an air flow path of the magnetic disk device.