JPS608548B2 - filter unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filter unit for a magnetic recording/reproducing device (hereinafter referred to as a magnetic sheet device) using a flexible magnetic sheet.

2. Description of the Related Art Magnetic sheet devices using flexible magnetic sheets are now being used in place of magnetic disk devices using hard magnetic disks, which have traditionally been used as storage devices for electronic computers. Unlike conventional magnetic disk devices, such a magnetic sheet device requires smooth air circulation in the vicinity of the magnetic sheet in order to stably rotate the magnetic sheet. Furthermore, even if the magnetic sheet is rotating stably, the flexible magnetic sheet will come into contact with the magnetic head, sheet stabilizer plate, etc. due to vibrations, etc., and dust such as magnetic material powder will be generated, causing malfunctions in magnetic recording and playback. It had become. In order to compensate for this drawback, it has been generally known to provide a filter in the air circulation path of a magnetic sheet device to remove dust.

In order to provide a filter so as not to obstruct the circulating air flow, which subtly affects the stability of the magnetic sheet, the filter area must be widened, and the filter unit therefore becomes large, making it impractical. The present invention eliminates the above-mentioned drawbacks of the prior art by providing a compact filter unit that has a large filter area. The present invention will be explained below with reference to the drawings.

FIG. 1 shows a sectional view of a magnetic sheet device equipped with a filter unit according to the present invention. First, an outline of the device will be explained.

Reference numeral 11 indicates a flexible disc-shaped magnetic sheet whose surface is coated with a magnetic material.The central part of this magnetic sheet 11 is fixed to a hub 12, and this hub 12 is connected to the rotating shaft 14 of a motor 13. It is something that is fixed.

Below the magnetic sheet 11, a stabilizer plate 15 is arranged approximately parallel to the magnetic sheet 11 and at a slight interval, as shown in the top view in FIG. By fixing it to the plate 15, it is fixed directly in position, and the through hole 1 provided in the center of the stabilizing plate 15
6 is sealed by this motor. The upper part of the magnetic sheet 11 has a hole in the center.
A back plate 1 whose surface facing the back plate is formed as a flat surface.
7 is arranged at a slight distance from the magnetic sheet 11, and the stabilizer plate 15 forms a closed space surrounding the magnetic sheet 11. Reference numeral 18 designates a magnetic head which is fixed to the back plate 17 and whose magnetic gap faces the magnetic sheet.

As shown in FIG. 2, the stabilizing plate 15 is provided with radial grooves 19 at equal intervals, and an annular groove 201 is provided to connect the outer periphery of the groove 19. 1
Since a through hole 21 passing through the stabilizer plate i5 is provided in the middle of the magnetic sheet 9, by driving the motor 3 at high speed, the air close to the magnetic sheet 11 moves as shown by the arrow in FIG. . That is, the air that entered through the holes in the back plate 17 passes between the back plate and the magnetic sheet and is moved toward the outer circumference of the magnetic sheet, and a part of the air passes through the through holes 21 and is surrounded by the stabilizer and the back plate. The other part passes through the bottom of the groove 19 and moves toward the center of rotation, and the air that comes out above the groove 19 is returned along the bottom surface of the magnetic sheet 11 toward the outer periphery. It can be moved. As described above, the air inlet is a hole provided in the center of the back plate 17, and the filter unit 22 according to the present invention is fixed to this hole as shown.

This filter unit 22 includes a dense filter (for example, glass wool) shown at 23, 24
A coarse filter (for example, a fillet air filter made of untwilled cloth, such as EP-5100 (trademark)) and an upper member 25 for holding these filters.
, a lower member 26, and an introduction member 27 for introducing purified air into the hole of the back plate 27.

That is, as shown in FIG. 3, the upper member 25 has a support member 29 extending radially from the central member, a ring member 30 is fixed to the end of the support punch 29, and the ring member 30 is latched at three positions. It is made by fixing the member 31. Also lower member 2
6 has a shape in which a small ring member 32 and a large ring member 33 are connected by a support punch 34, as shown in FIG. A stop member 35 is provided. Also, the introduction member 27
As shown in FIG. 5, a ring 36 is inserted into the hole of the back plate 17, a ring 37 is inserted into the inside of the small ring member 32 of the lower member, and an air introduction hole provided above the ring 37. The upper member 25 has a notch 38 and a screw receiver 40 that is fixed to the upper member 25 by a screw inserted into a screw hole 39 provided in the center member of the upper member 25.

Therefore, after storing the dense filter 23 and coarse filter 24 formed in a ring shape between the upper member and the lower member, they are fixed by the locking member and the locked member, and inserted into the introduction member 27 fixed to the back plate 17. By doing so, a unit as shown in FIG. 6 can be obtained. In such a unit, there is a gap 4 between the protrusions 41 provided on the central member 28.
2, even if this protrusion 41 and the small ring member 32 are butted together, air can flow through the gap 42 (
(However, this gap 42 is assumed to face the coarse filter.) Furthermore, since the ends of the ring member 30 and the large ring member 33 are butted against each other and are in close contact with each other, air does not enter from this part.

Further, as described above, the introduction section 27 is provided with a notch 38, so that the air that has passed through the gap 42 is introduced into the hole in the back plate through this notch 38.

The filter 23 is a narrow-mesh filter that essentially serves as a filter, and is used to remove dust, etc. from the air that flows in as shown by the arrow in Figure 1.
The filter 24 is a coarse-mesh filter, and does not substantially function as a filter, but rather forms an air flow path.

It should be noted that the airflow flowing into the back plate can be controlled by the size of the closing part 43 provided at the center of the introduction member 27.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a magnetic sheet device to which the present invention is applied, FIG. 2 is a top view of a stabilizer, and FIG. 3 is an upper member of a filter unit according to the present invention. A is a top view, B is a sectional view, Fourth
The figure shows the lower part of the filter unit according to the invention, A
5 is a top view, B is a sectional view, FIG. 5 is an introduction member, A is a top view, B is a bottom view, and FIG. 6 is a sectional view of a filter unit according to the present invention. Here, 23 is a fine filter, 24 is a coarse filter, 2
5 is an upper member, 26 is a lower member, and 27 is an introduction member. Pig 2', Shisai 3 figure A Juice 3 figure B Otozu soup 4 figure 8 Suage figure A O5 figure 8 Spear 6'2

Claims (1)

[Claims] 1. A relatively coarse coarse filter, and a dense filter that is narrower than the coarse filter and arranged so as to surround the coarse filter, and the coarse filter is used as a fluid passage to conduct fluid from the dense filter to the coarse filter. A filter unit configured so that water flows into it.