JPS61153867A - Magnetic head supporting device of magnetic recording device - Google Patents

Abstract

PURPOSE:To allow a magnetic head to stably follow to a flexible disk and to improve the durability of the disk by supporting a pivot which supports the reverse surface of the support gimbal springs of the magnetic head while shifting it from the center of the head in the rotating direction of the head. CONSTITUTION:Pivots 19 and 20 projecting from a carriage 1 and an arm 2 which support the back surfaces of gimbal springs 7 and 8 so that magnetic heads 13 and 14 do not move back from specific positions are fitted at a position behind centers of the springs 7 and 8 and heads 13 and 14 in the rotating direction of the flexible disk 15. Therefore, unbalanced pressure generated on the contact surface of the disk 15 is reduced by frictional forces between the disk 15 and heads 13 and 14 during the rotation of the disk 15. Consequently, the stable follow-up performance of the heads 13 and 14 on the disk 15 is obtained and the durability of the disk 15 is improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The invention is an improvement of a magnetic head support device in a magnetic recording device for double-sided media that records and plays back on both sides of a flexible double-sided magnetic disk (hereinafter referred to as a flexible disk). It is related to.

[Conventional technology]

3rd v! J is a sectional view showing a conventional magnetic head support device disclosed in, for example, Japanese Patent Publication No. 58-43826.

In the figure, (1) is a carriage that moves forward and backward on a suitable guide (not shown), and (2) is an arm that moves the carriage (
It is mounted on a seat (3) provided in the carriage (1) with a leaf spring (4), is rotatably supported within a certain range, and has a structure that allows it to approach or move away from the carriage (1). It has become. (5) and (6) are the carriages (1
), a window provided near the tip of the arm (2), (7
) and (8) are gimbal springs attached to the carriage (1) and arm (2) so as to be located within the windows (5) and (6).

These gimbal springs (7) and (8) are made from a single piece of thin spring material, as shown in Fig. 4, and have a central rectangular part (9).
is connected to the surrounding square frame (lO) at the narrow width part (11), and further an adhesive part (12) is formed that protrudes from the square frame (10) in a direction perpendicular to the narrow width part (11), The connection part of 2 is the carriage (1), the window part (5) of the arm (2),
It is fixed to the edge of (6) with adhesive.

At this time, the square portion (9) is formed so as to be able to rotate somewhat in the rotational direction of the flexible disk and in the radial direction. (13) and (14) are gimbal springs (7
), the magnetic head attached to the rectangular portion (9) of (8) performs recording and reproduction on the flexible disk (15). (1
6) and (17) are magnetic heads (13) and (14), respectively.
) is a pivot protruding from the carriage (1) and arm (2) so as to support the center of the back surface of the gimbal springs (7) and -(8) on which the magnetic head is attached so that the gimbal springs (7) and (8) cannot retreat beyond a predetermined position. (18) When recording/reproducing, the magnetic heads (13) and (14) sandwich the seven flexiful disks (15) between each other and pressurize them.
This is a pressure spring that ensures regeneration.

Next, the operation will be explained. Some means (not shown)
Lift the arm (2) with the magnetic head (13) and (
14), and insert the flexible disk (5) between the carriage (1) and the arm (2), and then pressurize the magnetic heads (13) and (14) with the pressure spring (18).
) is inserted into the flexible disk (15), and the flexible disk (15) is rotated to perform recording or reproduction. The magnetic heads (13), (14) are supported by pivots (16), (17) on their backs, so the flexible disk (15), which tends to bend, is restrained, and the magnetic heads (14), (15) ) with the pivots (16) and (17) as rotational fulcrums, the disk is swung somewhat in the disk rotational direction and radial direction.

[Problem that the invention seeks to solve]

The conventional magnetic head device as described above has a magnetic head (1
3), (14) and the torsion center of the gimbal springs (7), (8) (the narrow part (11) is the center of the gimbal springs (7), (8)
8) Centrally located. ) are almost the same, and when the gimbal springs (7) and (8) are pressurized, their centers are supported by pivots (161 and (171!), respectively!
, as shown in FIG. 5, a flexible disk (15)
During rotation, the flexible disk (15) and magnetic head (
The magnetic heads (13) and (14) are pulled rearward in the rotational direction of the flexible disk due to the frictional force on the contact surfaces of the magnetic heads (13) and (14), creating biased pressure on the flexible disk contact surfaces of the magnetic heads (13) and (14). In particular, the magnetic heads (13) and (14) each have a large amount of −
There is a problem in that the durability of the flexible disk is impaired due to the pressure applied thereto.

4. Generally, the gap of a magnetic head for recording on a flexible disk or reproducing information from a flexible disk is located approximately in the center of the magnetic head, and due to the above-mentioned biased pressure, the gap in the gap is In order to ensure the contact pressure to the flexible disk, the pressurizing spring (18) must be strengthened to provide a large pressurizing force, which poses problems such as impairing the durability of the flexible disk.

This invention was made to solve these problems, and it is possible to minimize the uneven stone pressure applied to the magnetic head surface when the flexible disk rotates, and also to reduce the magnetic head pressure to the necessary minimum. It is an object of the present invention to provide a magnetic head support equipment that can provide stable contact pressure between a flexible disk and a magnetic head and improve the durability of the flexible disk.

[Means for Solving the Problems] The magnetic head support device according to the present invention has the pivot supporting the back of the gimbal positioned behind the center position of the magnetic head in the direction of rotation of the flexible disk so that the magnetic head cannot retreat from a predetermined position. It was placed in

[Effect]

In the magnetic head support mechanism of the present invention, the pivot of the rotation fulcrum on which the magnetic head swings slightly following the flexible disk is located behind the center of the magnetic head in the direction of rotation of the flexible disk. Even if a rotational moment is generated on the magnetic head due to the frictional force between the disk and the magnetic head, the biased pressure on the magnetic head surface is reduced, and the magnetic head contacts the disk in a more stable manner.
The durability of the flexible disc is improved.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure and FIG. 2, (1) to (15) and (18) are completely the same as the conventional device described above.

(19), (20) are magnetic heads (13), (14)
The gimbal spring (7
), (8) so as to support the back of the carriage (1).
The pivots (19) and (20) project from the arm (2), and the pivots (19) and (20) are located at the center position of the gimbal spring (7), (8) and the magnetic head (13L (14)), and in the rotating direction of the flexible disk (15). It is attached at position e behind the

In the magnetic head support device configured in this way,
As shown in Figure 2, when the flexible disk rotates,
flexible disk (15) and magnetic head (13),
The center of rotation is the magnetic head (13), which absorbs the uneven pressure generated on the flexible disk contact surface due to the frictional force with the
(14) Since the center position and distance are shifted from each other, as will be described later, it can be reduced compared to a conventional case where the pivot is located at the center of the magnetic head.

In FIG. 5, e is the distance between the center position of the magnetic heads (13), (14) and the center of the pivot (19), (2G), h is the height of the magnetic head, and l is the flexible disk of the magnetic head. The length in the rotational direction, μ is the friction coefficient between the magnetic head and the flexible disk, and P is the pressure force applied to the head by the pressure spring (18).

Here, the rotational moment M generated in the magnetic head due to the frictional force with the flexible disk is M=μph...
... (1) Also, the pressure applied to the magnetic head surface per unit length in the rotation direction of the flexible disk is p.
Then, the following formula holds true.

Next, in order to understand the concept of lateral pressure applied to the magnetic head surface, the force p per unit length mentioned above is expressed as p = a x
+b ・・・・・・・・・ As (11), the above formula (i)
, (11), solving (i), Minnie 4≠(μh-e)
......(v)1)=+ (1--)/'-e
(μh-a) 1-=(vi), and when the pivot in the conventional example is at the center point of the magnetic head, that is, e =
In the case of 0, the maximum pressure occurs on the inlet side in the rotational direction of the flexible disk, and the pressure is P=+(1+6・-IL?-)...(■1). Considering the magnetic head for a flexible disk. In general, when μ = 04, h = 2m + I1 = 5am and substituted into equation (■1), p = 1.96・10, which is approximately Twice as much lateral pressure is generated. In contrast, in the present invention, if the amount of deviation in distance between the center point of the magnetic head and the center point of the pivot is set to approximately e = μh, the pressure on the magnetic head surface becomes almost uniform, and even if there is no extreme partial Since no surface pressure is generated, the durability of the flexible disc can be significantly improved.

In the above embodiment, only the pivots (19) and (2G) were arranged at the rear in the rotating direction of the flexible disk, but at the same time as the pivots, the narrow parts (11 ) also pivots (19), (2
If it is provided in the same position as 0), further effects can be expected.

Further, in the above embodiment, the carriage (1) and the arm (
The rear surface of each of the magnetic heads (13) and (14) in 2) is supported by pivots (19) and (20), respectively, but there is no pivot and the gimbal spring (I7)
, (18), the same effect can be achieved by arranging the gimbal, torsion, and center of the flexible disk at the rear in the rotating direction of the flexible disk.

〔Effect of the invention〕

As explained above, the present invention is a magnetic head support device that can be easily realized using a conventional component structure and does not require any special manufacturing method, and allows a magnetic head to stably follow a flexible disk. This has the effect of significantly improving the durability of the flexible disk.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a magnetic head support device according to an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a sectional view showing a conventional magnetic head support device, and FIG. The plan view and FIG. 5 are operation explanatory diagrams. In the figure, (1) is a carriage, (2) is an arm, and (1) is a carriage.
3) and (14) are magnetic heads, (7) and (8) gimbal springs, and (19) and (2G) are pivots. e is the distance between the centers of the magnetic head and the pivot. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa (and 2 others) Figure 1 Figure 3B Figure 5

Claims (2)

[Claims] (1) In a magnetic head support device for a double-sided magnetic recording device in which magnetic heads are brought into contact with both sides of a flexible disk, the magnetic head is supported on a gimbal spring that has a degree of freedom of movement in the rotational direction of the flexible disk. A magnetic head support device characterized in that a pivot supporting a back surface of a gimbal spring is supported at a position shifted rearward in the rotating direction of the flexible disk from the center position of the magnetic head. (2) The magnetic head according to claim 1, characterized in that the pivot is provided on the carriage or the arm and supports one of the gimbal springs at a position shifted to the rear side in the direction of rotation of the flexible disk. Support device.