JPS63239649A - Magnetic head supporting mechanism - Google Patents

Abstract

PURPOSE:To improve the following property and positional accuracy of a magnetic head by supporting displacibly the magnetic head in approximately vertical direction against a place and setting a spring constant in that direction and a torsional rigidity in the radial direction and the circumferential direction of a flexible disk into their appropriate regions. CONSTITUTION:A 1st magnetic head 5 and a 2nd magnetic head 9 are supported by a 1st supporting plate 6 and a 2nd supporting plate 10 respectively to be displacible in approximately vertical direction against the plane of the flexible disk 1. The spring constant is composed as approximately >=50g/mm and also the torsional rigidity of the radial direction and the circumferential direction of the flexible disk 1 is composed as approximately 400g.mm/rad - approximately 3,000g.mm/rad. In other words, the spring constant and the torsional rigidity of the radial direction and the circumferential direction of the flexible disk are set into their appropriate regions. By this method, the following property of the magnetic head is obtained good enough for practical use, and also the positional accuracy of the magnetic head is improved, while the life of the flexible disk is extended.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a liaison head support mechanism in a magnetic recording #i device, and more specifically to a double-sided magnetic head support mechanism.

[Conventional technology]

Conventionally, there are three types of supports for magnetic head supports in magnetic recording devices that use both sides of a flexible disk.

One is the type used by IBM when it first developed flexible disk drives (the so-called IBM type), in which a magnetic head was attached to the tip of an arm that provided springiness, and a protrusion attached to a pressure spring was used. The magnetic head is pressurized through the flexible disk, and the magnetic head is supported with degrees of freedom in the radial and circumferential directions of the flexible disk.

However, as the density of magnetic recording devices using flexible disks increases, it becomes difficult to control the position of the magnetic head to a specified position with sufficient positional accuracy with the above configuration. It is not used at all in magnetic recording devices that use tape.

Currently, the following two types of support mechanisms are used in magnetic recording devices using flexible disks of 5.25 inches or less.

FIG. 3 is a sectional view of the main part of the first type of support all, and FIG. 4 is a perspective view of the main part of the first type of support a groove, showing a part thereof.

In the first type of support mechanism (hereinafter referred to as a vertical gimbal type), a first magnetic head 55 and a second magnetic head 59 are connected to a first support plate 56 and a second support plate 6, respectively.
A first pivot 54a and a second pivot 5 are gimbal-supported by 0 and are further configured at the parts of the rigid first carriage 54 and second carriage 58.
8a, the first magnetic head 55 and the second magnetic head 59 are supported via the first support plate 56 and the second support plate 60, respectively, and 1) the flexible desk 51 of No. 11 is held between them; was.

In the magnetic head support structure A, each magnetic head has degrees of freedom in two directions (as shown by arrows 04 and 65 in FIG. 4), and each degree of freedom is defined by the first support plate 56 and the second support plate 60. The torsional rigidity is determined by the torsional rigidity of 200 g-m m /
The general rigidity was less than rad. A second type of magnetic head support Ia structure is shown in US Pat. No. 4,151,573 (Tanton patent).

This type of magnetic head support mechanism (hereinafter referred to as Tanton type) fixes a first magnetic head to a first carriage, a second magnetic head is gimbally supported by a support plate, and a part of the second carriage is fixed to the first magnetic head. The flexible disk was supported via a second support plate by a pivot having a structure such that the first magnetic head and the second magnetic head sandwiched the flexible disk.

In this support mechanism as well, the second magnetic head has degrees of freedom in two directions, as explained in FIG. It was determined by the torsional rigidity of the support plate.

Beya compensation-, /7N oboroso^-u IF Jd fuu,,-σ
In order to compensate for the fact that the second magnetic head is fixed to the first head and has no ability to follow the flexible disk, it is necessary to improve the ability of the second magnetic head to follow the flexible disk. The torsional rigidity of the support plate of the magnetic head was generally 150 g·mm/rad or less.

[Problem that the invention seeks to solve]

As described above, in the conventional first type magnetic head support structure a, as shown in FIG.
5 and the second magnetic head 59 are supported by the first pivot 54a and the second pivot 58a, respectively, so if the flexible disk 51 is tilted, the first magnetic head 55 The second magnetic head 59 tilts following the tilted flexible disk 51, resulting in deviation from the prescribed recording/reproducing position, so-called off-track.

Next, the off-track will be explained in detail.

FIG. 5 is an explanatory diagram of the off-track generation mechanism.

In FIG. 5, a first support plate 56 mounted on the first carriage 54 and a second support plate 56 mounted on the second carriage 54 are shown.
The second support plates 60 mounted on the front i! 8 First pivot l-54a and second pivot 58 a 1
．． : Abuts, supports and restricts deflection in the direction of each carriage, and each first pivot l-54
a and the contact point with the second pivot 58a as a fulcrum,
It is configured to be able to roll, and if the height of the flexible disk 51 changes or bends, for example, the previous iIt! With the first magnetic head 55 and the second magnetic head 59 sandwiching the flexible disk 51,
As shown in FIG. 5, the flexibility of the first support plate 56 and the second support plate 60 is maintained in balance between the flexibility of the flexible disk 51 and the flexibility of the first support plate 56 and second support plate 60.
The magnetic head 55 and the second magnetic head 59 are tilted and stabilized.

By the way, in order to maintain data compatibility with magnetic recording devices,
The recording/reproducing position of the recording/reproducing medium is standardized and defined, and in FIG. The recording and reproducing section of the magnetic head 59 causes a deviation from the normal recording and reproducing position of ΔX4, that is, off-track, and when data is reproduced in this state, the amplitude of the reproduced signal is increased and the correct reproduction may not be performed. , it becomes unplayable.

On the other hand, if data is recorded in this state and then played back using a normal magnetic recording device, the amplitude of the playback signal will be lowered and correct playback will not be performed or playback will become impossible. It also contained a fatal flaw that made the recording device incompatible, significantly reducing the reliability of the magnetic recording device.

Furthermore, in the second type of magnetic head support mechanism described above, unlike the first type of magnetic head support mechanism, the off-track does not occur, but since the first magnetic head is fixed, The ability to follow the tilt of the flexible disk is poor.2As a result, in order to obtain sufficient followability, the force that presses the second magnetic head toward the first magnetic head (so-called head pressure) must be increased. As a result, the life of the flexible disk is shortened.

Furthermore, in both the first type of magnetic head support mechanism (vertical gimbal type) and the second type of magnetic head support mechanism (Tanton type) described above, the second magnetic head 59 (shown in FIG. 3) is flexible. disk 51
When changing from a pressed state (not shown), that is, an unloaded state, to a pressed state, that is, a head loaded state (the state shown in FIG. 3), hold the flexible disk 51 and press the The first magnetic head 55 and the second magnetic head 59 collide, and the impact force causes damage to the magnetic film of the flexible disk 51. Depending on the degree of damage, the magnetic film may peel off, causing recording, reproduction, etc. It also has the problem of sometimes causing errors.

In order to weaken the above-mentioned impact, conventionally, an oil damper was attached to the second carriage to dampen the movement of the second carriage when the head was loaded, thereby reducing the impact. Not only is it expensive, but its characteristics change greatly depending on temperature.At high temperatures, the viscosity of the oil decreases, resulting in a decrease in damper effectiveness, while at low temperatures, the viscosity increases and the damper becomes too effective.

Also, in the first type of magnetic head support mechanism,
Also in the second type of magnetic head support mechanism, the first pivot 54a! J and a second pivot 58a are required, and when such pivots are used, the following problems occur.

FIGS. 6 and 7 are explanatory diagrams of the functions of the pivot and the support plate, and to simplify the explanation, only one head is shown, but the same applies to one head.

In FIG. 6, a first magnetic head 55 holds a flexible disk 51 and a flexible first support plate 5.
6, and the first support plate 5G is regulated by a first pivot 54a formed on the first carriage 54.

The first magnetic head 55 is connected to the flexible disk 51.
FIG. 7 shows the state in which it is tilted following .

In this case, the first magnetic head 55 tends to tilt following the flexible disk 51, and the first support plate 56 is twisted by a tie bar (indicated by 56y in FIG. 4), and the tie bar shown in FIG. However, since the first support plate 56 is restricted by the first pivot J-54a, in reality, the first pivot J-54a and the contact point of the first support plate 5G is used as a fulcrum, and the
Due to the above-mentioned action (shown in FIG. Extra force is required.

In other words, in the structure having the first pivot 54a, when the first magnetic head 55 tilts following the flexible disk 51, not only the force that twists the tie bar 5 (3y) but also the force that twists the arm portion 56a is applied. A bending force is required, and as a result, the ability of the first magnetic head 55 to follow the flexible disk 51 is impaired.

Regarding the second support plate 60 and the second pivot 58a, the ability of the second magnetic head 59 to follow the flexible disk 51 was impaired for the same reason.

In addition, in order to compensate for the deterioration in followability, it is necessary to reduce the torsional rigidity of the first magnetic head support plate 56 and the second magnetic head support plate 60, and in order to lower the torsional rigidity, bending support is required. There is also a problem in that the thickness of the plate becomes thinner, and therefore the support plate becomes weaker against external forces and is more likely to be damaged or deformed.

Therefore, the present invention aims to solve these problems.
The purpose of this is to support the magnetic head in a direction perpendicular to the plane of the flexible disk described in 071, and to limit the rigidity of the support plate of the magnetic head. Our goal is to provide a highly reliable magnetic head support device that stabilizes the ability of the magnetic head to follow the flexible disk.

[Means for Solving the Problems] The magnetic head support mechanism of the present invention has two magnetic recording and reproducing media, namely a flexible disk (1). A first magnetic head that contacts one surface of the M flexible disk, a first support plate that supports the first magnetic head with degrees of freedom in the radial and circumferential directions of the flexible disk, and the support. a first carriage that carries a plate and moves; a second magnetic head that contacts the other surface of the flexible disk and holds the flexible disk together with the first magnetic head; a second support plate that supports the disk with degrees of freedom in the radial direction and circumferential direction; a second carriage carried by and driven by the first carriage; a presser stage that presses the second magnetic head toward the first magnetic head and applies a required pressing force; a second magnetic spatula; II to 1'
In a magnetic head support mechanism comprising means for selectively supporting the flexible disk at a position away from the flexible disk against a tFJ suppressing force, the first support plate and the second support plate are arranged on a flat surface of the flexible disk. for one δ
It supports the first magnetic head and the second magnetic head so as to be displaceable in the vertical direction, and has a spring constant of about 50 g/sn m or more in this direction, and also in the radial direction of the flexible disk described above. The torsional rigidity in the circumferential direction is approximately 400 tg-m n+/r
ad ~ approx. 3000 g・m 111/ra
It is characterized by the measures taken in d.

[Effect]

According to the above arrangement of the present invention, the magnetic head is supported so as to be displaceable in a direction substantially perpendicular to the plane of the flexible disk, and the spring constant in this direction and the torsional rigidity in the radial and circumferential directions of the flexible disk are adjusted. Since the area is set in an appropriate area, the magnetic head can track the flexible disk sufficiently for practical purposes, and the magnetic head position t? To provide a magnetic head support mechanism with high fB reliability, which improves fB stability, prolongs the life of a flexible disk, and prevents the a-end of the head support from being easily damaged.

〔Example〕

Figure t5J is a sectional view of a main part of an embodiment of the magnetic head support mechanism of the present invention, and FIG. 2 is a plan view of a part of the main part.

In FIG. 1, a first carriage J capable of moving in the radial direction (direction of arrow 12) of a disc-shaped flexible disk L having an ulirt property moves to the first carriage J via a first support plate 6. It is equipped with one magnetic head 5.

In addition, 1) the second carriage 8, which is rotatable (not shown) and is supported by the first carriage 4 and driven by the first magnetic head 5 described in 1i, supports the second support plate 10; A second magnetic head 9 is mounted thereon.The second gear ridge 8 is located 30 mm to 100 m from the pivot point of the magnetic head 9.

In FIG. 2, the first support plate 6 is made of an extremely thin plate made of scrap metal or resin, and has a diameter of about 20 mm.
m is the size of the rn angle. A force is provided in the plane, and the tie bar Gy is twisted in the radial direction of the flexible disk L (indicated by the arrow 147 direction) by the force M, and the arm portion connecting the tie bar 6y and the tie bar 6x By bending 6a, the magnetic spatula 1
-5 is the 7 lexiple disk 1 (shown in Figure 1)
The center line of the tie bar 6y (Y f+&
), and can be brought into close contact with the flexible disk 1, and similarly, the tie bar 6X is twisted in the circumferential direction of the flexible disk 1, as shown in the direction of arrow 14x, By bending the arm portion 6a, the magnetic head 5 can rotate about the center a (X axis) of the tie bar 6x in accordance with the inclination of the flexible disk 1 (shown in FIG. 1). It is possible. The torsional rigidity in each direction of these two degrees of freedom is approximately 400 g・In m/rad ~ approximately 3000
The tentative J\ and shape of the first support plate 6 are determined so as to be configured by g - xn m / rad.

Also, before, il,! The second support plate io also has the same structure as the first support plate 6, and has a similar mechanism (not shown) to provide freedom in the circumferential direction and radial direction of the flexible disk 1, The magnetic head 9 can follow the inclination of the flexible disk 1 (shown in FIG. 1) and perform 1 (11 rotations).

The torsional rigidity in each direction of these two degrees of freedom is approximately 400g1
mm/rad ~ approx. 3000 g-nt ln/r
It is also the same as the first support plate in that the shape of the second support plate 6 is determined to be a(1 and (n).

Further, the first support plate 6 and the second support plate 10 are movable in a direction substantially perpendicular to the plane of the n'l pQ flexible disk (direction of arrow 13.15 in FIG. 1). magnetic head 5 and second magnetic head 9
The first supporting plate G
Since the second support plate 10 has a spring property, the force of pressing the second magnetic head 9 in the direction of the first magnetic head 5 (hereinafter referred to as head pressure) described in 1) causes the first magnetic head to Support plate 6
and the second support plate 10 are connected to the arm portion 6a shown in FIG.
and said A-1, JSI<1r1(1/Fb1T 律F, 4
IJ+?・-～-1. ↓, Fu, --, --
,tree! It is stable in the 41' state.

the first support plate 6 and the second support plate 10 in the direction;
The plates JV of the first support plate 6 and the second support plate IO are configured such that the spring stiffness in this direction is about 50 g/mm or more.
, it goes without saying that it constitutes the shape.

In the structure described above, the first magnetic head 5 and the second magnetic head 9 are supported so as to be movable in a direction substantially perpendicular to the plane of the flexible disk l (in the direction of arrow 13.15 in FIG. 1). The first pivot f.54n and the second pivot 58a (third
(shown in the figure), it becomes possible to eliminate the deterioration in followability caused by the IJ pivot mentioned in 1) of the conventional example. However, if the conventional support plate was used as is,
There was a problem in that the first support plate 5G and the second support plate 60 were largely bent in a direction substantially perpendicular to the plane of the flexible disk 51, making it impractical.

In order to prevent this, the rigidity of the support plate in the direction must be increased, but if the rigidity in this direction is increased too much, the support plate will inevitably become thick, resulting in Since the increase in the torsional rigidity of the support plate cannot be avoided, the torsional rigidity of the support plate increases too much, and the followability deteriorates.

As described above, the rigidity of the support plate in a direction substantially perpendicular to the plane of the flexible disk and the aforementioned torsional rigidity are limited to extremely limited appropriate ranges. 'M
The range was determined experimentally and the preferred range was determined by setting a spring constant of about 501 in a direction substantially perpendicular to the plane of the flexible disk as stated in the above claim Utl;
7 mm or more, the radial and circumferential torsional rigidity of the aforementioned flexible disk is approximately 400 g-mm/+-, ad
The stiffness value is ~3000 g-mm/ra+, 1, and the data on which the stiffness was calculated is shown next.

First, in FIG. 1, the spring constant in a direction substantially perpendicular to the plane of the flexible disk l (in the direction of arrows 15 and 13) is constrained by the following points.

The above-mentioned head pressure (generally about 20 gf, which will be explained in detail later) acts on the first support plate 6 and the second support plate 10, so that the two support plates 6 and the second support plate 1
0 is deflected in the directions of arrows 13 and 15, and due to this deflection, the mounting portion of the first support plate 6 on the first carriage 4 and the mounting portion of the second support plate 6 on the second carriage 8 The spacing between parts becomes narrower. General magnetic head head height (
A contact surface 7 between the first support plate 6 and the magnetic recording medium and a contact surface 11 between the plane of the second support plate 10 and the magnetic recording medium.
Since the distance between the two support plates is approximately 2.5 mm, the distance between the two support plates is approximately 5 mm. Furthermore, the first support plate 6 and the second support plate 10 are caused by the head pressure (assuming the spring constant in this direction to be 50 g f / mm).
By bending each by 0.4 mm, the distance between the two support plates becomes 4.2 mm.

For example, in the case of a 3.5-inch flexible disk, the Jf of the jacket 2 surrounding the flexible disk is standardized at 3.4 m river use.

If the deflection becomes larger than this, there is a risk that the jacket 2' enclosing the flexible disk n;1 will come into contact with the first support plate 6 or the second support plate 10 or the first carriage 4 or the second carriage 8. Yes, the first key
Yarifuji 4. There is a risk that contact may occur due to dimensional variations in the second carriage 8 and the jacket 20, and the required head pressure will not be applied to the magnetic head, making it impossible to obtain a sufficient reproduction output. Therefore, the rigidity in this direction is 50gf
/mm or more is required.

Next, regarding the torsional rigidity of the first support plate 6, this rigidity is the sum of the torsional rigidity of the tie bars 6x and 13y mentioned above and the contribution to the torsional rigidity due to the deflection of the arm portion 6a.
The contribution to the torsional rigidity due to the deflection of the 7'-arm portion 6a is larger than the rigidity of the tie bars Gx and 6y, and the same applies to the second support plate 10. .

*9 Ifl J /71 Male>-, the rigidity in the substantially perpendicular direction to the plane of Prudy 1 is also the same as the arm portions 6a, 1.
Since the stiffness is almost determined by the deflection of 0a, for example, the 7' rim portion 6 should be set so that the stiffness is 50 gf/mm or more.
When the plate thickness and shape of the support plate a and 10a are determined, the spring constant of the contribution to the torsional rigidity due to the deflection of the arm portion 6a will inevitably increase, and the torsional rigidity of the entire support plate will also inevitably increase.

In order to reduce the torsional rigidity, the tie bar portion 6x.

6y or lox, 10y has no choice but to be made thinner and longer, and as a result, the sizes of the first support plate 6, the second support plate 10, and the carriages 4, 8 become larger, and the tie bar part Gx, 6y, 10x.

The durability of 10y decreases and it becomes impossible to realize it.

From the above, the torsional rigidity is 400 g-mm/rad.
The above values are appropriate and achievable, and can be said to be preferable values.

Next, the upper limit of the torsional rigidity of the support plate is determined from a range in which the followability does not deteriorate. The followability is determined by the head pressure and the torsional rigidity of the support plate, and the followability becomes better as the head pressure is made stronger and the torsional rigidity is lowered.

However, increasing the head pressure has the disadvantage of shortening the life of the flexible disk, and in the past, a magnetic recording device using a 5.25-inch flexible disk had a head pressure of about 30[fζ]. However, in order to extend the life of the flexible disk,
These days, there are many around 20gF.

Therefore, in the present invention, it is naturally assumed that the head pressure is about 20 gf, and a preferable range of the rigidity of the support plate that provides good followability is set.

FIG. 8 is a diagram illustrating the reproduction output of the double-sided magnetic recording device, in which the horizontal axis represents the relative distance between the flexible disk plane and the contact surface 7 of the first magnetic head 5 with the magnetic recording medium shown in FIG. i! 1 m (hereinafter referred to as head height), this is an example in which the reproduction output voltage of the magnetic head 5 is shown as a ratio to the maximum reproduction output voltage on the m-axis.

Figure 8 shows that even if the head height becomes higher or lower,
This explains the fact that a sufficient reproduction output voltage is not generated.

The larger the permissible width (indicated by A) of the head height in which the reproduction output voltage can be obtained is 90% or more of the maximum reproduction output voltage, the better the followability of the head, and the tolerance II'! If A is less than 0.15 mm, it becomes extremely difficult to adjust the head height to the permissible width A, and mass productivity is lost. Therefore, the head height permissible @A
Tables 1 and 2 are the results of actual measurements using support plates with various torsional rigidities.

Table 1 is a list of actual measured values showing the permissible width of the head height with respect to the support plate rigidity in the magnetic head support Fa structure for 3.5 inch flexible disks, and Table 2 is a list of measured values showing the permissible head height width with respect to the support plate rigidity in the magnetic head support Fa structure for 3.5 inch flexible disks.
3 is a list of actually measured values showing support plate rigidity and head height permissible width in a magnetic head support mechanism for a cb flexible disk.

Table 1 Head height allowance for torsional rigidity of support plate
%i (mm) Table 2 Head height permissible width (mm) relative to support plate torsional rigidity From Table 1, in the case of a magnetic head support m structure for a 3.5 inch flexible disk, the torsional rigidity is 3000 g-1ll m/ra. (1@
The head height allowable width A is 0.15m from around M.
m or less, making it unsuitable for mass production. Similarly, from Table 2, 5
．． 25in c) l for flexible disk 1j! In the case of a head support mechanism, the torsion force is 2000 g-m.
The allowable head height gA starts from around m/rad.
is less than 0.15 mm, making it unsuitable for mass production.

From the above, to summarize the torsional rigidity, the torsional rigidity is approximately 400 g-mm/rad to approximately 3000 g-
It is shown that a deviation of mm/rad is a preferable range since it is possible to maintain the followability well.

The above-described magnetic head support structure a in the magnetic recording device for screen media of the present invention is not only fully practicable, but also has the following improvements.

1) In the conventional example, in the first type of magnetic head support m (vertical gimbal type) described in detail 1, the rigidity of the support plate is configured to be lower than necessary, and the rigidity of the flexible disk l (third For the slope of (shown in figure),
The magnetic head easily tilts, resulting in the above-mentioned off-track. However, in the present invention, the torsional rigidity of the support plate is approximately 115 times higher than that of the conventional one. The amount of tilting of the support plate 6 and the second support plate 10 (shown in FIG. 1) and the first magnetic head 5 and the second magnetic head 9 is reduced, and as a result, the above-mentioned off-track is reduced.

Furthermore, since the magnetic head can be displaced in a direction substantially perpendicular to the plane of the flexible disk 1, the following effects are achieved, and off-track is further reduced.

FIG. 9 is an explanatory diagram of off-track in the present invention.

As mentioned above, the first support plate 6 at t1η is bent in a direction substantially perpendicular to the plane of the flexible disk l, and is in balance with the above-mentioned pressing force, and in this balanced state, the first magnetic head 5 is tilted. The tilting mechanism is a virtual tilting fulcrum 1) located on the same plane as the mounting surface 4b formed on the first carriage 4, and existing on a virtual line connecting the if mounting surface 4L+. If the tilt angle θl of the first magnetic head 5 is the same, the larger the deflection amount of the first support plate 6, the smaller the off-track amount Δxi. Become.

Similarly, the second support plate lO is bent in a direction substantially perpendicular to the plane of the flexible disk 1, and is in balance with the above-mentioned pressing force, and in this balanced state, when the second magnetic head 9 is tilted, , the tilting mechanism configures a virtual tilting fulcrum P2 that is located approximately on the same plane as the mounting surface 8b formed on the second carriage 8 and that exists on an imaginary line connecting the mounting surface 8b. If the inclination angle θ2 of the similar magnetic head 9 is the same, the larger the deflection amount of the second support plate 10, the smaller the off-track amount -ΔX2.

As explained above, in the structure in which the first magnetic head 5 and the second magnetic head 9 are inclined while the first support plate 6 and the second support plate 10 are respectively bent, The amount of off-track is much smaller than the amount of off-track caused by the above-mentioned conventional example of the vertical gimbal type or the magnetic head support AM of the Kunton Quib. The amplitude drop in the signal is slight, and 1lllf to playback ann.
can be ignored.

2) Furthermore, regarding the above-mentioned 11th attack at Herad Road,
Since the first support plate 6 and the second support plate 10 have a spring property in a direction substantially perpendicular to the plane of the flexible disk 1, they act as a buffer member against the impact, and when the load is loaded, the first support plate 6 and the second support plate 10 The first magnetic head 5 and the second magnetic head 9 reduce the impact force applied to the flexible disk 1, and this effect lengthens the life of the flexible disk 1 and increases the reliability of the magnetic recording device. possible.

3) Furthermore, since the rigidity of the support plate 1iij is higher than in the past, the support plate becomes strong against external forces and is less likely to be damaged by troubles such as the jacket 2 enclosing the flexible disk 1 getting caught. , which is effective in improving reliability.

Furthermore, to add to the content of the present invention, as shown in FIG. 1, when the head is loaded, the support plate is deflected due to the head pressure. It is desirable that the magnetic head 5 and the second magnetic head 9 be parallel to each other before being bent.

Therefore, in order to realize this, it is necessary to incorporate the following two mechanisms into et9. The first is to prevent the first magnetic head 5 from tilting when force is applied to the contact surface 7 (shown in FIG. 1) of the first magnetic head 5 with the flexible disk l, that is, the head surface 7. When viewed from the vertical direction of the head surface 7 (as shown by the arrow 13), the center line of the tie bar 6X of the support [6 (shown as the X axis in FIG. 2) and the center AI of the tie bar 6y (as the Y axis in the TJZ diagram) The center 0 of the head surface 7 should be approximately aligned with the intersection point of (shown).

That is, the tie bars 6x, 6y are moved so that the magnetic head is tilted with the center 0 of the head surface 7 as a virtual fulcrum.
will be placed.

FIG. 1O is an explanatory diagram of the tilting of the magnetic head depending on the tie bar position described above.

A first magnetic head 5 is mounted on the first support plate 6, and the first magnetic head 5 rotates jj (indicator) about the Kuiper center 61) (shown as the Y axis in FIG. 2). be.

Furthermore, a pressing force is applied to the head surface 7 by an opposing magnetic head 9 (not shown), which acts as a pressure on the head surface 7 (this is indicated by an arrow 17).

Since this pressure is replaced by acting as a resultant force F at the center of the head surface 7, the moment about the Y axis is
1'' (as shown by arrow 18), and the magnetic head 5 will tilt.

In order to prevent the above-mentioned type 1, if the Y-axis is placed on the line of action of the resultant force F, the moment 1° will not occur, so the tie-bar center 6b (Y-axis) when viewed from the vertical direction of the head surface 7 The above-mentioned inclination can be prevented by providing it so as to substantially coincide with the center O of the head surface.

The same applies to the X-axis side, so the head surface 7
The inclination can be avoided by arranging the head so that the intersection of the X-axis and the Y-axis substantially coincides with the center of the head surface when viewed from the vertical direction. The second support plate 10 is also manufactured by friJ.

Next, the second a-groove will be explained.

Even if the above-mentioned first machine (N) is implemented, the rigidity of the arm portions 6a (there are four as shown in FIG. 2) of the temporary support 6 in the direction approximately perpendicular to the plane of the flexible disk 1 If there is a difference, the arm section with lower rigidity will deflect less than the arm section with higher rigidity, and as a result, the front head 5 and the second magnetic head 9 will be tilted. The same applies to the second support plate 10, and FIG. 11 is a diagram illustrating the tilting of the magnetic head due to the difference in rigidity of the support plate arm portions.

FIG. 12 is an explanatory diagram of the pressure on the head surface due to the rigidity of the arm portion.

In FIGS. 11 and 12, the first support plate 6 is bent under the head pressure as described above.
The magnetic head 5 is supported by the second support plate 10.
The second magnetic head 9 is supported in a bent state, and the flexible disk 1 is sandwiched therebetween.

If there is a difference in the rigidity of the arm portion 6a of the first support plate 6,
One of them is set to 6 and the other is set to 6', and the rigidity of the arm part 10 of the second support plates J and Oa is set to 101 (,
Indicated by J-Ok'.

Figure 11 shows that (compared to jk, 6' has higher rigidity, and 10
shows a case in which the stiffness of lOk is higher than ′, the amount of deflection on the more rigid side is small and the deflection on the less rigid side is large, and the first magnetic head 5 and the second magnetic head 9 are tilted. There is.

I of this first magnetic head 5 and second magnetic head 9
v (To remove the stiffness, set the stiffness of the arm section 6 k and 6', 10 and 101 ['' to be equal, or set the stiffness of the arm section 6 to 10, and f3 to ' and 10). ′ should be equal.

The ff￥12 diagram shows that 6k has higher rigidity than 6k', l Ok has higher rigidity than 10', and the rigidity of the arm part is equal to 6 and 10, and 61c' and 10' are equal. The following shows the case.

In the above case, the surface pressure 18 applied to the head surface 7 of the first magnetic head 5 and the head surface 11 of the second magnetic head 9 is higher as the arm is closer to the arm on the higher rigidity side;
The closer the arm is to the side with lower rigidity, the lower the surface pressure will be.

Therefore, a core section 20 that performs recording and reproduction of the second magnetic head 9
is the core section 19 that performs recording and reproduction of the first magnetic head 5.
Compared to the above, the flexible disk 1 has a higher recording density on the inner circumference, and the disadvantages in recording and reproducing can be improved by increasing the surface pressure and increasing the followability. can.

In other words, the rigidity of the arm portions facing each other with respect to the surface of the flexible disk in the two support plates is made approximately equal, and the rigidity of the arm portion on the side closer to the core 20 of the second magnetic head 9 is made equal. If you increase the second magnetic head 9
Since the surface area on the side closer to the core 20 of the second magnetic head 9 is higher, the core section 20 that performs recording and reproduction of the second magnetic head 9 has a higher surface area than the core section 19 that performs recording and reproduction of the first magnetic head 5. In the flexible disk I, it is located closer to the inner circumference and has a high recording density, which can improve the disadvantages in recording and reproducing, and improve the performance of the entire magnetic recording device.

Also, Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 1
FIG. 7 is a plan view of main parts in another embodiment showing the shapes of the first support plate 6 and the second support plate IO, and FIG.
The present invention can also be realized with the shapes of the first support plate 6 and the second support plate IO as shown in FIGS.

In FIG. 13, FIG. 14, FIG. 15, FIG. 16, and FIG. 17, in order to simplify the explanation, only the support plate No. 1 will be explained as in the previous embodiment, but The same applies to the second support plate.

The first magnetic head 5 is supported by a first support plate 6,
Mounted on the first carriage 4, the first support plate 6 is provided with a groove in its plane, whereby the first support plate 6 is an outer frame fixed to the first carriage 4. Part 6C
The magnetic head 5 is composed of tie bar portions 6x and 6y that provide flexibility and torsional rigidity, a mounting portion 6d on which the magnetic head 1 is mounted, and an arm portion 6a that provides flexure and torsional rigidity.
can be tilted.

Furthermore, in the magnetic head support C1 structure of the present invention, the support plate bends during the above-mentioned read, and has the effect of softening the impact. Under stress, in particular the tie bar 6Xe 63'l 10X.

Stress concentration tends to occur at both ends of the toy, which may cause problems in durability.

Tie bars 6x are used to prevent stress concentration.

It is desirable that the configurations of both ends of 6y, 10x, and 10y be connected to the Arno 1 part Ga and loa as smoothly as possible.

Considering the shape of the support plate from this point of view, the arm shape shown in FIG. 15 is disadvantageous because the angle θ3 formed between the tie bar 6y and the arm 6a is small, and as shown in FIG. It is desirable to do so.

Similarly, it is desirable that the angle θ4 formed between the tie bar 6x and the Arno section 6a is 90' or more, and for the same reason, the angle θ5 formed between the tie bar 6y and the outer frame section 6C is also set to the tie bar 6X.
It is also desirable that the angle θ6 formed by the magnetic head support portion 6d be 90° or more.

Naturally, the same applies to the second support plate 10.

Furthermore, during recording and reproduction, friction between the flexible disk 1 (shown in FIG. 1) and the first magnetic head 5 or the second magnetic head 9 causes the first magnetic head 5 or the second magnetic head 9 to The magnetic head 9 may vibrate and the reproduction output may become abnormal. This is a phenomenon called the so-called Hera 12 cry. In order to prevent this phenomenon, a member 17 (shown in FIG. 13) having a vibration-absorbing effect, such as rubber, may be attached to the first support plate 6, the second support plate 10, or both. In particular, the arm portion 6a
and the outer frame portion 6c of the support plate, the arm portion 10a and the outer frame portion of the support plate]Oc, or the arm portion 6a and the magnetic head of the support plate IS mounting portion 6d, the arm portion 10a and the support It is highly effective to tie it so as to bridge the magnetic head mounting portion 10d of the plate.

〔Effect of the invention〕

As described above, the present invention has many of the effects described in the embodiments, and in particular, the magnetic head support structure of the present invention can be displaced in a direction substantially perpendicular to the plane of the flexible disk. By supporting the magnetic head in the direction shown in FIG. It also has the advantages of improving the magnetic head's rotation angle by 111 degrees compared to the conventional one, extending the life of the flexible disk, and making the head support structure less likely to be damaged.
The present invention provides a highly reliable magnetic head support structure with a simple structure, and the practical effects of the present invention are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of an embodiment of a magnetic head support mechanism of the present invention, and FIG. 2 is a plan view of a main part of a part of a first magnetic head support groove of the present invention. Fig. 3 is a sectional view of the main part of the magnetic head in an example of a conventional magnetic head support mechanism (head support Tf mechanism), and Fig. fjS4 is a perspective view of the conventional magnetic head support mechanism. Fig. 5 is a conventional magnetic head support mechanism. magnetic spatula 1
: It is an explanatory diagram of off-track due to inclination. FIGS. 6 and 7 are explanatory views of the functions of a pivot and a support plate of a conventional magnetic head support mechanism. FIG. 8 is an explanatory diagram of an example of reproduction output of the double-sided magnetic recording device. FIG. 9 is an explanatory diagram of off-track due to magnetic head inclination in the present invention. FIG. 10 is an explanatory diagram of the inclination of the magnetic head depending on the tie bar position in the present invention. FIG. 31 is an explanatory diagram of the inclination of the magnetic head due to the difference in rigidity of the support plate arm portion in the Kinoi Ql. FIG. 12 is an explanatory diagram of the pressure on the head surface due to the rigidity of the arm portion. FIGS. 13 to 17 are plan views of essential parts of other embodiments of the support plate according to the present invention. Table 1 is a list showing the support plate rigidity and head height allowable width in a magnetic head support afff for a 3.5 inch flexible disk, and Table 2 shows the support plate rigidity and head height tolerance in a magnetic head support mechanism for a 5.25 inch h flexible disk. It is a list showing head height permissible widths. 1...Flexible disk 2.
・・・・・・・・・・・・Jacket 4・・・・・・・・・
・・・First carriage 5・・・・・・・・・・・・
First magnetic head 6...First support plate 6a...Arm portions 6x, 6y of the second support plate...・Tie bar 8 of the first support plate...
・・・・・・・・・Second carriage 9・・・・・・
...Second magnetic head 10...
...Second support plate 10a...Arm part 10 of first support plate, IOy...Tie bar part 12 of first support plate... ...Flexible disk rearward 13.15 ---Substantially perpendicular to the flexible disk plane or more Applicant Seiko Epson Corporation Figure 1 Figure 3 Figure 5 Figure 6 Figure 7 -/l -''Book 2 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 14 Figure 16 Figure 17

Claims (1)

[Claims] A flexible disk that is a magnetic recording and reproducing medium, a first magnetic head that contacts one surface of the flexible disk, and a support for the first magnetic head with degrees of freedom in the radial and circumferential directions of the flexible disk. a first support plate that carries the support plate and moves the support plate; a second magnetic head that contacts the other surface of the flexible disk and holds the flexible disk together with the first magnetic head; a second support plate that supports the second magnetic head with degrees of freedom in the radial and circumferential directions of the flexible disk; the second support plate is mounted and faces the first carriage; a second carriage that is rotatable and is carried by and driven by the first carriage, and presses the second magnetic head toward the first magnetic head;
A magnetic head support mechanism comprising a pressing means for applying a required pressing force, and a means for selectively supporting the second magnetic head at a position away from the flexible disk against the pressing force, wherein the first supporting The plate and the second support plate respectively support the first magnetic head and the second magnetic head so as to be displaceable in a direction substantially perpendicular to the plane of the flexible disk, and have a spring constant of about 50 g in this direction.
/mm or more, and the torsional rigidity of the flexible disk in the radial and circumferential directions is approximately 400g.
- A magnetic head support mechanism characterized by having a magnetic head support mechanism of mm/rad to approximately 3000g/mm/rad.