JPH0770136B2 - Magnetic recording / reproducing device - Google Patents

Description

The present invention relates to a magnetic recording / reproducing apparatus using a magnetic sheet as a recording medium.

[Outline of Invention]

The present invention relates to a magnetic recording / reproducing apparatus for performing recording / reproduction by sliding a magnetic sheet traveling in one direction on a magnetic head to attach the magnetic head to a pad corresponding to the magnetic sheet, and attach the pad to the magnetic sheet. When the magnetic sheet travels, a negative pressure is generated between the magnetic sheet and the pad surface, and the magnetic sheet travels along the pad surface. It is designed to be surely and stably slidably contacted.

[Conventional technology]

Conventionally, in a magnetic recording / reproducing apparatus using a thin magnetic sheet as a recording medium, in order to improve the contact of the magnetic head with the magnetic sheet, as shown in JP-A-60-35369, the recording / reproducing of the magnetic sheet is performed. A sheet pressing device is provided on the opposite surface side of the magnetic sheet corresponding to the magnetic head arranged on the surface side, and the sheet pressing device regulates the pressing of the magnetic sheet so that the magnetic sheet is slidably contacted.

[Problems to be solved by the invention]

When a sheet pressing device that presses the magnetic sheet from the opposite side to the sliding contact portion of the magnetic head is provided in this way, avoid creep deformation of the sheet when the magnetic sheet is stopped, and sticking due to dew condensation etc. when the magnetic sheet is started. Therefore, a mechanism for contacting and separating the pressing member with respect to the magnetic sheet is required, which complicates the structure and requires a space for disposing such a mechanism in the mechanical deck, which increases the size of the mechanical deck itself and increases the cost. There was a drawback.

The present invention has been made in view of the above points, and provides a magnetic recording / reproducing apparatus in which a magnetic sheet is attracted to the magnetic head side by the traveling of the magnetic sheet and slidably contacts the magnetic head, and a good head contact can be obtained. .

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention is a magnetic recording / reproducing apparatus which performs recording / reproduction by sliding a magnetic sheet traveling in one direction on a magnetic head, and one end of which is arranged close to the magnetic sheet. , A pad having an inclined surface whose other end is gradually inclined away from the surface of the magnetic sheet along the running direction of the magnetic sheet, and a pad provided substantially at the center of the pad for recording and reproducing on the magnetic sheet. A magnetic head provided so as to project from the inclined surface by a required amount, a through hole that is provided between the pad and the magnetic head, and allows air to flow between the lower side of the pad and the pad inclined surface side. An opening and closing means for opening and closing to regulate the flow of air is provided, and when performing recording or reproduction, the through hole is closed by the opening and closing means,
By rotating the magnetic sheet, a negative pressure is generated between the inclined surface of the pad and the magnetic sheet to run along the surface of the pad to perform recording or reproduction by the magnetic head, and when the recording or reproduction is finished, The through hole is opened by the opening / closing means, and the negative pressure between the magnetic sheet and the inclined surface of the pad is released.

[Action]

With this configuration, when the rotation of the magnetic sheet is activated, the air gap between the magnetic sheet and the inclined surface of the pad becomes equal to the atmospheric pressure when the through hole is in the ventilation state, and the magnetic sheet is separated from the pad and the magnetic head. Therefore, even when the inclined surface of the pad is in a dew condensation state, non-rotation of the spindle due to sticking and damage to the magnetic sheet are prevented.

Also, after the rotation of the magnetic sheet is started, by closing the through hole, the gap between the magnetic sheet and the pad becomes negative pressure,
When recording or reproducing is performed by rotating along the inclined surface of the pad and surely slidingly contacting the magnetic head, and when the rotational traveling is stopped from this recording or reproducing state, the through hole is opened and the inclined surface side of the pad is placed. By releasing the negative pressure between the magnetic sheet and the pad in the ventilated state, the magnetic sheet is separated from the pad, the rotation stopping operation is smoothly performed, and the creep deformation of the magnetic sheet is prevented.

[Reference example used for explanation of the present invention]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, an embodiment of the present invention will be described with reference to the drawings. First, one embodiment will be described with reference to FIGS.

Reference numeral (1) is a disk-shaped magnetic sheet, which is attached to a center core (2) at the center as shown in FIG. 3, and is fitted to a spindle hub (3) via the center core (2) and a carrier (4 ) Is pressed and positioned by the clutch plate (5) attached to the spindle hub (3). This spindle hub (3) is constantly rotated by a drive motor (synchronous motor).

The pad (6) is arranged corresponding to the drive mechanism of the magnetic sheet (1), that is, corresponding to the rotational traveling portion of the magnetic sheet (1), and the magnetic head (7) is attached to the pad 86). In the case of this example, as shown in FIG. 1, the magnetic head (7) has a required amount, for example, a few, from the surface (6a) of the pad (6).
It is mounted so as to protrude by 10 μm. The amount of protrusion of the magnetic head (7) varies depending on the rounded shape of the head tip.

The pad (6) is inclined and opposed such that the surface (6a) of the pad (6a) is sequentially separated from the recording / reproducing surface of the magnetic sheet (1) in the rotational traveling direction (arrow direction in FIG. 1), An air gap a is formed between the sheet (1) and the sheet (1) in the direction of rotation, and the surface (6a) of the pad (6) is formed.
There is a gap b of about 1 μm between the inclined high-order edge and the magnetic sheet (1).

By disposing the pad (6) to which the magnetic head (7) is attached so as to correspond to the magnetic sheet (1) that is rotationally traveled by the drive mechanism as described above, the magnetic sheet (1) is rotationally traveled by the drive mechanism. Then, on the surface of the magnetic sheet (1), an air flow in the same direction as the sheet traveling speed is generated, and flows into the surface (6a) of the pad (6) through a gap b, but from the gap b. Since the air gap a is formed in a divergent shape at the front due to the inclination of the surface (6a), this air gap part becomes a negative pressure to the other surface side of the magnetic sheet (1). Therefore, the magnetic sheet (1) is pressed against the surface (6a) of the pad (6) by air pressure, and the surface (6a) of the pad (6) is pressed.
Thus, the magnetic head (7) protruding from the surface (6a) is slidably contacted to perform recording or reproduction.

The recording or reproducing of the magnetic sheet (1) is performed as described above, but the magnetic head (7) uses the surface (6) of the pad (6).
Since a required amount (several tens of μm) is projected from a), a narrow spacing (0.1 μm or less) can be maintained between the magnetic sheet (1) and the head contact omission due to the unevenness of the surface of the magnetic head (7). Will also be prevented.

In the above structure, the surface (6a) of the pad (6) has a quadrilateral shape as shown in FIGS. 2A and 2B as long as it has a shape capable of forming the above-mentioned void a between the pad (6) and the magnetic sheet (1). It may be (rectangular) or circular.

Next, an embodiment of the present invention will be described with reference to FIGS. 4 and 5, in which the negative pressure generated between the magnetic sheet and the pad in the above-described reference example can be adjusted.

That is, in the structure shown in FIGS. 4 and 5, a recess (6b) is formed in the center of the surface (6a) of the pad (6), and the recess (6
A magnetic head (7) is attached to the center of b), and the end of this head is made to project to the surface (6a) side by the required amount as in the previous embodiment.

A vent pipe (8) communicating with the outside is connected to the recess (6b) of the pad (6), and a valve (9) is attached to the vent pipe (8) to open and close the recess (6b). 6b) and the outside can be controlled to be conductive or non-conductive.

The pad (6) is also arranged corresponding to the rotational traveling portion of the magnetic sheet (1), and the surface (6a) is inclined so as to be gradually separated in the traveling direction of the magnetic sheet (1) so that the surface (6a) is separated from the magnetic sheet (1). Is formed so as to form a divergent space a in the running direction.

In this example having such a structure, when the magnetic sheet (1) is rotated while the valve (9) of the ventilation pipe (8) is closed, the magnetic sheet (1) is moved in the same manner as in the above-described embodiments.
The air gap a between the pad and the surface (6a) of the pad (6) becomes a negative pressure, so that the magnetic sheet (1) is run along the surface (6a) of the pad (6) (see solid line in FIG. 4). State) Sliding contact with the magnetic head (7) for recording or reproduction. Also,
The magnetic sheet (1) when the magnetic sheet (1) is rotated while the valve (9) of the ventilation pipe (8) is open.
The divergent space a between the pad and the surface (6a) of the pad (6) is ventilated to the outside through the recess (6b) of the pad (6) and the ventilation pipe (8), and is maintained at atmospheric pressure to maintain the magnetic sheet. (1) is rotatively traveled without following the surface (6a) of the pad (6) (state indicated by the chain double-dashed line in the figure), and therefore is not in sliding contact with the magnetic head (7) and recording or reproducing is not performed.

In this way, in this example, by opening / closing the valve (9) during the rotational traveling of the magnetic sheet (1), the magnetic sheet (1) is brought into sliding contact with the surface (6a) of the pad (6) and the magnetic head (7). Since it can be moved or released, by opening the valve (9) and releasing the sliding contact with the surface (6a) of the pad (6) and the magnetic head (7) when the magnetic sheet (1) starts to rotate. , The surface of the pad (6) (6
Even when a) is a dew condensation state, spind's non-rotation due to sticking and damage to the magnetic sheet (1) are prevented, and the magnetic sheet (1) is rotated and activated without receiving any load resistance. Power consumption can be reduced and
The valve (9) can be started in a short time to a predetermined rotation, and after this start
The magnetic sheet (1) is rotated along the surface (6a) of the pad (6) as described above and slidably contacts the magnetic head (7) for recording or reproduction.

When stopping the rotational traveling of the magnetic sheet (1) in the recording or reproducing state, the operation is performed by opening the valve (9) to separate the magnetic sheet (1) from the pad (6) and then stopping the rotation. Magnetic sheet (1)
Will not be damaged.

FIGS. 6A, B, and C are modified examples of the embodiment shown in FIGS. 4 and 5, and FIG. 6A shows a cross-section of a cross section in which the recess (6b) of the pad (6) widens outward. The through hole (6c) is formed, and the closing pin (10) is opened and closed by mechanically inserting and removing the closing pin (10) from the outside into the through hole (6c).

In the figure B, a through hole (6d) is formed in the recess (6b) of the pad (6), and an elastic closing piece (11) is attached to the outside of this through hole (6d) to constantly close the through hole (6d). It is biased so that it is operated only when the through hole (6d) is opened. Further, the closing piece (11) may be formed of a bimorph so as to be electrically opened and closed.

In FIG. 6C, the pad (6) is formed in a flat plate shape, and the magnetic head (7) attached to the pad (6), that is, the magnetic sheet (1) extends along the surface (6a) of the pad (6). When rotating, the magnetic head (7) forms a through hole (6e) in a tent-shaped portion, and an elastic blocking piece is provided on the outer surface side of the through hole (6e) as in the case of FIG. (11) is attached and the through hole (6e) is opened and closed.
In this case as well, the blocking piece (11) may be formed of a bimorph and electrically opened and closed.

In each of the modified examples configured as described above, as in the case of the embodiment shown in FIGS. 4 and 5, the through holes () formed in the pad (6) during rotation of the magnetic sheet (1) ( 6c),
Magnetic sheet (1) by opening and closing (6d), (6e)
Are brought into contact with and separated from the surface (6a) of the pad (6), and the above-mentioned effect can be expected.

Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to these embodiments, and it goes without saying that various configurations can be made without departing from the spirit of the present invention.

〔The invention's effect〕

As described above, according to the present invention, the magnetic head is attached to the pad so as to protrude by a required amount, and a negative pressure is generated between the pad and the magnetic sheet by using the flow of air when the magnetic sheet is running, so that the magnetic sheet is padded. Along with the surface of the magnetic head and slidingly contact with the magnetic head, and the through hole formed between the pad and the magnetic head is opened by the opening / closing means to release the negative pressure to separate the magnetic sheet from the surface of the pad and the magnetic head. Since it is configured as described above, extremely good contact of the magnetic sheet with the magnetic head can be obtained without adjusting the pad, and recording and reproducing are always performed reliably, and the magnetic sheet is separated from the pad when the rotation is started. Even when the surface of the is dewed, sticking is prevented to prevent the spindle from rotating and the magnetic sheet itself from being damaged. Creep deformation can be prevented with rotation stopping operation can be smoothly carried out because it can be separated in manner.

Further, the pad and the magnetic head are integrated to correspond to one surface side of the magnetic sheet, and since the support adjustment and movement mechanism of the pad is not used, the structure is simplified and the mechanical deck is made thin and compact. It becomes possible and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic front view of a main part in a reference example used for explaining the present invention, A shows a stopped state of a magnetic sheet, and B shows
2A and 2B are plan views of an example of a pad, FIG. 3 is a schematic sectional view of a reference example of a magnetic recording / reproducing apparatus to which the present invention is applied, and FIG. FIG. 5 is a schematic plan view of the pad of the embodiment of the present invention. FIG. 5 is a plan view of the pad. Is. In the figure, (1) is a magnetic sheet, (6) is a pad, (6a) is a surface, (6b) is a recess, (6c), (6d) and (6e) are through holes,
(7) is a magnetic head, (8) is a vent pipe, (9) is a valve, (10) is a blocking pin, (11) is an elastic blocking piece, and a is a divergent void.

Claims (1)

[Claims] 1. A magnetic recording / reproducing apparatus for performing recording / reproduction by sliding a magnetic sheet traveling in one direction on a magnetic head for recording / reproducing, wherein one end is arranged in proximity to the magnetic sheet and the other end is formed by the magnetic recording medium. A pad having an inclined surface that is gradually inclined away from the surface of the magnetic sheet along the running direction of the sheet, and an inclined surface of the pad that is provided substantially in the center of the pad and that performs recording and reproduction on the magnetic sheet. A magnetic head provided so as to project from the pad by a required amount from the through hole, which is provided between the pad and the magnetic head, and through which air flows between the lower side of the pad and the pad inclined surface side. An opening / closing means for opening / closing the through hole to restrict the flow of air is provided. When recording or reproducing, the through hole is closed by the opening / closing means and the magnetic sheet is rotatively run to move the path. A negative pressure is generated between the magnetic sheet and the inclined surface of the pad to cause the magnetic sheet to run along the surface of the pad to perform recording or reproduction by the magnetic head, and when the recording or reproduction is finished, the through hole is formed. Is opened by the opening / closing means to release the negative pressure between the magnetic sheet and the inclined surface of the pad.