JPS5843092Y2 - magnetic recording device - Google Patents

Description

[Detailed description of the invention] The invention creates a minute gap with respect to the magnetic head by rotating a sheet-like magnetic recording medium, and in this state information is written on the magnetic recording medium. The present invention relates to a magnetic recording device that reads information.

In this type of magnetic recording device, the magnetic recording medium is not in contact with the recording head, so the lifespan of the magnetic recording medium and the magnetic head is longer than that of conventional magnetic recording devices in which the magnetic recording medium is pressed against the magnetic head with a bat. It has the advantage of being able to achieve high-speed information processing as well as high-speed information processing, so it tends to be used frequently as a magnetic recording device such as a system typewriter.

On the other hand, in recent years, there has been a demand for increasingly higher speeds and larger capacities.

Therefore, in order to increase the speed, instead of moving the magnetic head for a single track in the track direction using a motor etc. as seen in conventional so-called sheet file devices, we use a so-called integrated head that spans multiple tracks. A method for selecting tracks using an electronic circuit was developed.

However, because the magnetic head was placed radially from the center of rotation of the magnetic recording medium, the gap size between the magnetic head and the magnetic recording medium differed between the inner and outer circumferential sides, making information processing unstable. The problem is that it can happen.

That is, air sucked in from the center of rotation of the magnetic recording medium flows toward the outer periphery in a spiral pattern and hits the magnetic head.

Here, a part of the airflow flows through a minute gap between the magnetic head and the magnetic recording medium, and the rest flows toward the outer periphery along the magnetic head.

The side currents flowing in the outer circumferential direction along the magnetic head are small at the innermost circumference, but at the outermost circumference, the side flows flowing across the entire width merge to form a large airflow.

This difference in side flow between the innermost and outermost peripheries causes a gap size difference of 0.5μ or less between the magnetic head and the magnetic recording medium, which can be uniformly distributed over a wide area spanning multiple trunks. It was difficult to

The present invention was developed based on the above circumstances, and its purpose is to make the minute gap between the magnetic head and the magnetic recording medium uniform over the entire width by changing the arrangement angle of the magnetic head. It is an object of the present invention to provide a magnetic recording device that achieves this.

The present invention will be explained below based on one embodiment of the invention.

In the figure, reference numeral 1 denotes a table, and a DC motor 3 for rotating a magnetic sheet 2 serving as a magnetic recording medium is provided at the center of the lower surface of the table 1.

The drive shaft 3a of the DC motor 3 has its tip protruding toward the upper surface of the table 1 through a drive shaft insertion hole 4 consisting of a stepped hole formed in the table IK, and a magnetic sheet holder 5 is fixed thereto. .

This magnetic sheet holder 5 is fixed to the drive shaft 3a with its upper surface protruding very slightly from the upper surface of the table 1, and the distance between the mutually facing surfaces of the magnetic sheet 2 and the table 1 is 50-100.
A gap t of approximately μ can be formed.

Further, the ring-shaped magnetic sheet holding plate 6 fitted onto the threaded portion of the magnetic sheet holder 5 can be pulled out from the threaded portion by removing a locking nut 7 screwed onto the threaded portion. There is.

Further, the magnetic sheet 2 is formed into a disk shape, and the threaded portion of the magnetic sheet holder 5 is inserted through a through hole 2a provided in the center of the magnetic sheet 2, and the magnetic sheet holder 5 and the magnetic sheet presser plate 6 are connected to each other. It is designed to be held in place.

When the drive shaft 3a of the DC motor 3 is driven, the magnetic sheet 2 and the table 1 float at a constant speed and are rotated parallel to the upward direction of the table 1 by the air flow generated between the magnetic sheet 2 and the table 1. There is.

Further, a magnetic head 9 faces the lower surface side of the magnetic sheet 2 through a slit 8 formed in the table 1.

This magnetic head 9 consists of a so-called integrated head in which magnetic recording/reproducing gaps for multiple tracks are patterned on a surface of silicon or the like, and recording tracks 10 are formed concentrically on the magnetic sheet 2. It is set up so that it spans all the numbers.

Furthermore, as shown in FIG. 2, the magnetic head 9 has air currents 11a, 11b, .
N and are arranged at substantially orthogonal angles.

Among them, 12 shown in FIG. 1 is an index disk attached to the tip of the lower end of the drive shaft 3a of the DC motor 3, and 13 is a sensor that optically detects the hole in the disk 12 using an LED and a phototransistor. The recording surface of the magnetic sheet 2 is equally divided (sectored) in the circumferential direction to detect sectors of recording tracks 10 formed concentrically.

Then, the magnetic sheet 2 is rotated by energizing the DC motor 3, and the magnetic information of the recording tracks 10 formed concentrically on the magnetic sheet 2 is selected by an electronic circuit (not shown). This means reading, writing magnetic information, or erasing it.

At this time, the magnetic sheet 2 floats due to the air current flowing between the magnetic sheet 2 and the table 1 caused by the rotational movement, rotates parallel to the upper surface of the table 1, and is also spaced between the magnetic sheet 2 and the magnetic head 9. A minute void is formed and there is no direct contact between the two.

That is, when the centrifugal force acts to lift the magnetic sheet 2, the air that has come into contact with the surface of the magnetic sheet 2
is frictionally engaged with the magnetic sheet 2 and stroked by the magnetic sheet 2.

The centrifugal force acting on the air molecules acts so that the engaged air is forced outwardly between the magnetic sheet 2 and the table 1.

Since the air pumped outward, that is, in the circumferential direction while drawing a spiral from the center of rotation, has a considerable velocity, the pressure between the magnetic sheet 2 and the table 1 is reduced according to Bernoulli's theorem, and thus Bernoulli's Force is exerted by the internal force of the magnetic sheet 2, centrifugal stress, and moving air, and acts to separate the magnetic sheet 2 and the table 1.

Once the magnetic sheet 2 rotates parallel to the top surface of the table 1, a minute gap is formed between the magnetic sheet 2 and the magnetic head 9 due to the air flow.

At this time, the magnetic head 9 aligns with the air currents 11a, 11b, . Because of the arrangement, the airflow 11a, 1
1b...11o, respectively, hit the magnetic head 9 at right angles.

This causes the side current 14 flowing along the magnetic head 9 to
... is directed towards the inner circumference at the innermost circumference, towards the outer circumference at the outermost circumference, and the side flow 14 at the inner and outer circumferences...
The flow rates are approximately the same.

Therefore, the airflow conditions on the inner and outer peripheries are almost the same, the gap size between the magnetic head 9 and the magnetic sheet 2 is uniform over the entire width, and information processing can be carried out in a stable state.

As explained above, the present invention is designed to rotate a sheet-like magnetic recording medium to create a small air gap for a magnetic head that is installed over a plurality of recording trunks that are formed concentrically on the magnetic recording medium. In a magnetic recording device that writes magnetic information or reads written information in this state, the magnetic head draws a spiral shape from the center of rotation as the magnetic recording medium rotates. The airflow is arranged at an angle substantially perpendicular to the airflow flowing toward the outer periphery.

Therefore, in the case where the magnetic head is arranged radially from the rotation center of the magnetic recording medium as in the conventional case, the side current flowing along the magnetic head has an innermost circumferential portion and an outermost circumferential portion.
Therefore, there is no difference in the size of the gap between the magnetic head and the magnetic recording medium, and the size of the small gap between the magnetic head and the magnetic recording medium is uniform over the entire width, so that information processing can be performed in an extremely stable state.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway schematic front view, and FIG. 2 is an explanatory diagram showing the positional state of the magnetic head and airflow. 2... Magnetic recording medium, 9... Magnetic head, 10...
-Recording track, 11a-11 "... Airflow.

Claims (1)

[Scope of utility model registration request] By rotating a sheet-like magnetic recording medium, a minute gap is formed in the magnetic head that is installed across multiple recording tracks formed concentrically on the magnetic recording medium, and information is written in this state. enter or write 1
The magnetic head is arranged at an angle substantially perpendicular to the airflow that flows toward the outer periphery while drawing a spiral shape from the center of rotation as the magnetic recording medium rotates. magnetic recording device.