JPH01113953A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain a firm and stable head touch by encircling a magnetic head with a surrounding wall, sucking air within the surrounding wall due to a lowering of the atmospheric pressure attending upon an increase of airflow speed and producing a negative pressure therein. CONSTITUTION:A partition frame 17 having the surrounding wall 16 surrounding all over a circle with the center of the magnetic head 12 is provided, and a space 19 surrounding the magnetic head 12 is formed by the partition frame 17 and a magnetic sheet 11. The surrounding wall 16 is positioned in an airflow rotating with the rotating magnetic sheet 11, and notches 20 are provided in such a position respectively that the airflow speed is changed and then the changed airflow speed is approximately the max. The airflow 1 generated with the rotation of the magnetic sheet 11 flows round along the outer periphery of the surrounding wall 16 of the partition frame 17, and the flow speed is increased to cause the lowering of the atmospheric pressure, so that the air is sucked out through the notches 20, resulting in the negative pressure in the space 19. By this method, the magnetic sheet 11 is sucked to be forcibly brought into contact with the magnetic head 12, thus obtaining the stable head touch.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a magnetic recording/reproducing device that has a simple structure and stabilizes head touch of a magnetic head.

<Prior art> In recent years, relatively inexpensive small-diameter flexible sheet-like magnetic recording media (hereinafter referred to as magnetic sheets) have been used to record image information, etc. by sliding a magnetic head onto the magnetic sheets that rotate at high speed. Magnetic recording devices for reproduction have been developed. In this type of device, in order to perform high-density recording on a magnetic sheet, it is necessary to bring the magnetic head into stable sliding contact with the magnetic sheet. Otherwise, stable sliding contact cannot be achieved because the magnetic sheet is flexible. Therefore, a device has been proposed that uses negative air pressure to bias a magnetic sheet toward the magnetic head, as disclosed in, for example, Japanese Patent Application Laid-Open No. 61-9868.

FIG. 5 is a schematic diagram of a device that utilizes this negative pressure.

This device has all receipts 11 as shown in FIG.
Slanted surfaces 14a are provided on the upstream and downstream sides of the magnetic head 12, facing the recording surface 11n, and are inclined so as to gradually move away from the magnetic sheet 11 from the upstream side to the downstream side in the moving direction 13 of the magnetic sheet 11.

Head sliding contact members 14 and 15 having 15a are arranged. According to this device, on the side of the magnetic sheet 11 facing the head sliding contact members 14, 15, air flowing along with the magnetic sheet 11 rotating at high speed is moved by the inclined surfaces 14a, 15a of the head sliding contact members 14, 15. It expands and creates negative pressure there. Therefore, as shown by the two-dot chain line in FIG. 5, the magnetic rate 11 is
5 side, and is forcibly brought into contact with the magnetic head 12.

<Problems to be Solved by the Invention> However, in the conventional device using negative pressure described above, in order to achieve stable head touch, a large amount of deflection of the magnetic sheet 11 by negative pressure is required. Therefore, there was a problem in that it was difficult to generate negative pressure to obtain the bias. Further, in the conventional device, the area of the portion facing the magnetic sheet 11 is large, and there is a concern that the surface of the magnetic sheet 11 may be damaged due to sliding contact.

The present invention was developed in view of the above circumstances, and is capable of reliably attracting the magnetic sheet to the magnetic head side using negative pressure to obtain stable head touch, while also preventing damage to the surface of the magnetic sheet. The aim is to provide a new device that is easy to use.

Means for Solving the Problems> A magnetic recording and reproducing apparatus according to the present invention that solves the above problems is a magnetic recording and reproducing apparatus that performs recording and reproducing by bringing a magnetic head into sliding contact with a rotating flexible sheet-like magnetic recording medium. The recording/reproducing device includes a peripheral wall surrounding the magnetic head and located in an air flow that rotates with the rotating magnetic recording medium, and a leading edge of the peripheral wall is close to the recording surface of the magnetic recording medium. A partition frame is provided to form a space surrounding the magnetic head, and the partition frame connects the space to the outside in the vicinity of a position where the flow velocity is maximum due to a change in the flow velocity of the air flow caused by the partition frame. It is characterized by being provided with an air circulation section.

Effects> The airflow generated by the rotation of the magnetic recording medium increases in flow velocity as it detours along the outer periphery of the partition frame, causing a drop in air pressure.

As a result, air is sucked out from inside the partition frame through the air circulation section, creating negative pressure in the space surrounding the magnetic head.
The magnetic sheet is attracted and forced into contact with the magnetic head.

Example of implementation Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a partially cutaway side view of a magnetic head section according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. As shown in FIGS. 1 and 2, this device is provided with a partition frame 17 having a peripheral wall 16 that surrounds a magnetic head 12 over its entire circumference. The leading edge of the peripheral wall 16 is close to the recording surface 11a of the magnetic sheet 11, and the base end of the peripheral wall 16 is continuous with the supporting portion 18 in the head carriage of the magnetic head 12, thereby separating the partition frame 17 and the magnetic sheet. 11 forms a cavity 19 surrounding the magnetic head 12. In this embodiment, the circumferential wall 16 has a long axis in the circumferential direction of the magnetic sheet 11 and a short axis in the radial direction when viewed from above.
'- It has an elliptical shape, and its elliptical peripheral wall 16 is located in the air flow that rotates with the rotating magnetic sheet 11, and is adapted to change the air flow velocity. Furthermore, Zhou l
! S! A notch 20 is provided in a part of the tip edge of the side part 16, thereby forming an air circulation part that connects the cavity 19 and the outside of the peripheral wall 16. The position of this notch 20 is
The position is set at a position where the air flow velocity changed by the peripheral wall 16 is approximately maximum, or at a position slightly upstream from the position in consideration of the delay in pressure change.

Further, the depth D of the notch 20 from the tip edge of the peripheral wall 16 is approximately the thickness of the air layer that rotates with the magnetic sheet 11, for example, 2
Select a value of 00 μm or less. Note that, as long as the value is within this range, the air circulation portion may be formed by drilling holes in the peripheral wall 16 instead of the notches 20.

According to such a configuration, as shown in FIG.
The flow detours along the outer periphery of the peripheral wall 16, and the flow velocity increases in the process. The increase in flow velocity causes a decrease in air pressure, whereby air is sucked out of the space 19 inside the partition frame 17 through the notch 20, and the space 19 becomes under negative pressure. As a result, the magnetic sheet 11 covering the space 19 is attracted and forced into contact with the magnetic head 12.
A stable head touch can be obtained. In this case, blank space 19
Since it is a limited area surrounded by the partition frame 17, sufficient negative pressure suction force can be secured, and the magnetic head 12 can be moved around the circumference! !
! Since it is located in the center of '16, the magnetic sheet 1 is evenly distributed.
1 can be brought into contact with the magnetic head 12, and
The amount of deflection of the magnetic sheet 11 due to attraction can also be reduced.

Here, since the magnetic sheet 11 comes into sliding contact with the leading edge of the peripheral wall 16, it is desirable that it be smooth and have excellent wear resistance. Therefore, for example, it is preferable to form a hard oxide film on the surface of the leading edge of the peripheral wall 16, and to impregnate the film with a synthetic resin having excellent non-adhesiveness and wear resistance, such as polyfluoroethylene.

Further, in the above-described embodiment, the peripheral wall 16 has an elliptical shape, but the present invention is not limited to this shape as long as it increases the flow velocity of the air flow (for example, as shown in FIG. 4).
It may be a streamline shape as shown in a) or an oval shape as shown in the figure (bl).In addition, the arrow 22 in the figure indicates the direction of air flow.

<Effects of the Invention> As described above in detail with reference to the embodiments, according to the present invention, a magnetic head is surrounded by a peripheral wall, and the air inside the peripheral wall is reduced by a decrease in air pressure accompanying an increase in air flow velocity caused by the presence of the peripheral wall. By attracting the magnetic sheet and creating a negative pressure there, the magnetic sheet is drawn and brought into contact with the magnetic head by the negative pressure, so it is possible to obtain a reliable and stable head touch by generating sufficient negative pressure suction force. becomes. Furthermore, since the area of the sliding contact portion with the magnetic plate is small, there is little possibility of damaging the surface of the magnetic sheet.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a magnetic head according to an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is an explanatory diagram of the operation, and FIGS. FIG. 5 is a plan view of a magnetic head section according to another embodiment of the invention, and FIG. 5 is a schematic configuration diagram of a device according to a conventional example. In the drawings, 11 is a magnetic sheet, 12 is a magnetic head, 16 is a peripheral wall, 17 is a partition frame, 19 is a blank space, and 20 is a notch.

Claims (1)

[Claims] In a magnetic recording and reproducing device that performs recording and reproducing by bringing a magnetic head into sliding contact with a rotating flexible sheet-like magnetic recording medium, a magnetic head is located within an air flow that surrounds the magnetic head and rotates with the rotating magnetic recording medium. a partition frame having a peripheral wall with a leading edge of the peripheral wall in close proximity to the recording surface of the magnetic recording medium to form a space surrounding the magnetic head;
The magnetic recording and reproducing device is characterized in that the partition frame is provided with an air circulation portion connecting the space to the outside near a position where the flow velocity becomes maximum due to a change in the flow velocity of the air flow caused by the partition frame. Device.