JPH07114779A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce influence on an actuator by magnetic interference by arranging a magnet for latch having a magnet latch mechanism and a movble piece at a position at the height of an upper board or a lower board of the side on which a permanent magnet is arranged. CONSTITUTION:A magnet latch mechanism for latching an actuator 10 has a movable piece 12 attracted to a magnet for latch, and the magnet 11 for latch is in contact with the movable piece 12 at the time of latching. In this case, since the magnet 11 for latch and the movable piece 12 for latch of the magnet latch mechanism to fix the actuator 10 are arranged at a position at the height of either of the upper yoke 1 and the lower yoke 2 at which a magnet 13 for VCM is arranged, even if it is miniaturized and a distance L is made shorter, magnetic interference between the magnet latch mechanism and the VCM magnetic circuit is suppressed to the minimum, and influence on the movable piece 12 can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to magnetic recording / reproducing in which a magnetic head mounted on an actuator is moved in the radial direction of a magnetic disk by the interaction between a current flowing in a voice coil and a permanent magnet arranged in at least one of upper and lower yokes. The present invention relates to a magnetic recording / reproducing apparatus having a latch mechanism for fixing an actuator.

[0002]

2. Description of the Related Art In a hard disk drive (HDD), a latch mechanism for fixing an actuator equipped with the magnetic head is usually provided so that the magnetic head is positioned in the CSS zone when the magnetic head is not accessed. Has been. As the latch mechanism, for example, a movable piece (iron piece) attached to one end of the actuator is attached to a permanent magnet (magnet) attached to a fixed portion such as a magnetic circuit or a yoke via an elastic body such as rubber or elastomer. There is a method of adsorption. Further, the actuator is usually driven by a voice coil motor (VCM), and in most cases, the voice coil is attached to the actuator.

[0003]

By the way, as the drive is miniaturized, the actuator is naturally miniaturized. However, with the magnetic circuit of VCM,
It is desirable that the magnetic circuits of the latching mechanism be sufficiently separated to eliminate their mutual interference due to leakage flux.

FIG. 9 is an enlarged view of a main part of a conventional magnetic recording / reproducing apparatus. As shown in FIG. 9, in the conventional magnetic recording / reproducing apparatus, the magnetic field is arranged between the upper and lower yokes 1 and 2 (within a space Z). Since the latching (fixing) magnet 3 of the latch mechanism is attached, it is practically impossible to secure a sufficient distance due to the miniaturization of the actuator as described above, and the magnet latching mechanism and the VCM magnetic circuit are Each leakage magnetic flux causes magnetic interference. Therefore, a force is exerted on the movable piece in the inner peripheral surface or the outer peripheral direction,
There is a problem in that it affects the control of the magnetic head attached to the actuator. In addition,
In FIG. 9, 5 is a voice coil fixed arm provided in the actuator, 6 is a movable piece attached to the fixed arm 5 and attracted to the latch magnet 3, 7 is an elastic body, 8 is a back yoke, and 9 is for VCM. It is a magnet.

Further, if the movable piece 6 of the actuator and the latching magnet 3 are left attracted to each other for a long time, there is a problem that the attraction force increases with time. This phenomenon is remarkable especially at low temperature, for example, -10
If it is left for 1000 hours or 2000 hours at ℃, it may become twice or more the adsorption force at room temperature initials. As a countermeasure, the material of the elastic body 7 is changed, the secondary vulcanization is performed, the surface roughness is increased, the surface portion is made to have irregularities, or the surface is broken by irradiating with ultraviolet rays to roughen the surface. Although there is a measure such as a latch, a latch mechanism for a small actuator cannot be a complete countermeasure.

A first object of the present invention is to provide a magnetic recording / reproducing apparatus in which the magnetic interference between the magnet latch mechanism for latching the actuator and the magnetic circuit of the VCM has little influence on the actuator.

A second object of the present invention is to provide a magnetic recording / reproducing apparatus in which the attraction force between the movable piece (iron piece) attached to the actuator and the latch magnet does not increase even at a low temperature. .

[0008]

A first object of the present invention is to arrange a voice coil of an actuator between upper and lower plates which face each other and constitute a yoke, and to arrange the current flowing through the voice coil and at least one of the upper and lower plates. In the magnetic recording / reproducing apparatus for driving the actuator by interaction with the permanent magnet to move the magnetic head mounted on the actuator in the radial direction of the magnetic disk, the upper plate or the lower plate on the side where the permanent magnet is arranged. At the height of
This is achieved by a first means in which a latch magnet and a movable piece (iron piece) of a magnet latch mechanism for fixing the actuator are arranged.

In the magnetic recording / reproducing apparatus in which the magnetic head is moved in the radial direction of the magnetic disk by driving the actuator, the second object is the latching movable piece of the magnet latch mechanism for fixing the actuator or the actuator. The latch magnet itself,
Alternatively, it is achieved by a second means in which a film of polyimide, fluorine, Teflon, or the like is attached to or coated on at least one of the elastic materials arranged so as to be in contact with them.

[0010]

In the first means, the influence of the magnetic interference generated by the leakage magnetic flux between the magnet latch mechanism for latching the actuator and the magnetic circuit of the VCM on the actuator is reduced.

In the second means, the attraction force between the movable piece attached to the actuator and the latch magnet hardly increases with the passage of time.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. A first embodiment of the magnetic recording / reproducing apparatus according to the present invention will be described. The first embodiment is an example of a latch mechanism that uses an attractive force. 1 is a plan view of an essential part of the first embodiment, FIG. 2 is an explanatory view seen from the direction of arrow A in FIG. 1, and FIG. 3 is an enlarged view of an essential part of FIG.

As shown in these figures, a fixed (latch) magnet 11 for fixing (latch) the actuator 10 is replaced with a VCM magnet (magnet) 13.
Is arranged on the upper yoke 1 on the side where is arranged. In the case of this embodiment, since the VCM magnet 13 is arranged only in the upper yoke 1, the latch magnet 11 is also arranged in the upper yoke 1.

That is, the latch magnet 11 and the movable piece 12 are located on the side of the upper yoke 1 on which the VCM magnet 13 is arranged, and at a position other than the interval Z formed by the upper yoke 1 and the lower yoke 2. ing. The VCM magnet 13 is attached only to the upper yoke 1.

The pole face C of the latch magnet 11 for attracting the movable piece 12 is formed in the vertical direction (direction orthogonal to the moving direction of the movable piece 12) in FIG. The polarity of the pole surface C of the latch magnet 11 is determined by the latch magnet 1
It is attached so that it has the same polarity as the polarity of the pole surface A of the VCM magnet 13 on the side where 1 is arranged.

Reference numeral 14 is an elastic member of the latch mechanism, 15 is a voice coil attached to the actuator 10, 16 is a fixed arm of the actuator 10 for fixing the voice coil 15, and 17 is extended from the fixed arm 16 toward the upper yoke 1. The movable piece 12 is attached to the arm 17. Reference numeral 18 is a magnetic head attached to the actuator 10, 19 is a rotation fulcrum of the actuator 10, 2
0 is the back yoke, and L is the distance between the movable piece 12 and the VCM magnet 13.

The latch mechanism utilizing the attracting force includes a latch magnet 11, an arm 17 extending from the fixed arm 16 of the actuator 10 toward the upper yoke 1, and an arm 1.
7 has a movable piece 12 attached to the latch magnet 11 and attracted to the latch magnet 11, and in the latch mechanism,
When latching, the latch magnet 11 (actually, the elastic member 14 of the latch mechanism interposed between the latch magnet 11 and the movable piece 12) and the movable piece 12 are in contact with each other.

In the first embodiment constructed as described above, the actuator 10 is fixed at the height position of one of the upper and lower yokes 1 and 2 where the VCM magnet 13 is arranged. Since the latching magnet 11 and the latching movable piece 12 of the magnetlatch mechanism are arranged, even if the distance L is reduced due to downsizing, the magnetic interference between the magnetlatch mechanism and the VCM magnetic circuit can be suppressed to the minimum. The influence on the movable piece 12 mounted on the magnetic disk 10 can be reduced, and the magnetic head 18 can be accurately controlled even if the distance between the innermost cylinder on the magnetic disk and the CSS zone is shorter than before. Is possible. This enables an increase in the number of cylinders per disk surface, that is, an increase in the storage capacity of the magnetic recording / reproducing apparatus.

Further, by attaching the polar surface A of the VCM magnet 13 and the polar surface C of the latch magnet 11 on the side where the latch magnet 11 is mounted so as to have the same polarity, it is possible to further improve the magnetic property. Interference can be suppressed.

FIG. 4 is an explanatory view of the second embodiment of the magnetic recording / reproducing apparatus according to the present invention. This second embodiment is a VC
In the example of using two M magnets, VCM is also used for the lower yoke 2.
A magnet 21 is arranged. The rest of the configuration is the same as that of the first embodiment, and the second embodiment also has the same effects as the first embodiment.

Next, a third embodiment of the magnetic recording / reproducing apparatus according to the present invention will be described. The third embodiment is an example provided with a latch mechanism utilizing the suction force. FIG. 5 is an explanatory view of a third embodiment of the magnetic recording / reproducing apparatus according to the present invention, and FIG. 6 is an enlarged view of a main part of FIG.

The latch magnet 22 and the movable piece 23 are positioned on the side of the yoke 1 to which the VCM magnet 13 is attached and at a position other than the space Z formed by the upper yoke 1 and the lower yoke 2.

The pole surface E of the latch magnet 22 that attracts the movable piece 23 is formed in the left-right direction (direction parallel to the moving direction of the movable piece 23) in FIG. The polarity of the pole surface E of the magnet 22 for latch is the magnet 2 for latch.
2 is attached so as to have the same polarity as the polarity of the pole surface A of the VCM magnet 13 on the side where 2 is attached, and magnetic interference is minimized.

And, the latch mechanism utilizing the suction force is
A latch magnet 22, an arm 24 extending from the fixed arm 16 of the actuator 10 toward the upper yoke 1,
It has a movable piece 23 attached to the arm 24 and attracted to the latch magnet 22. In the latch mechanism, the latch magnet 22 and the movable piece 2 are latched.
3 is not in contact.

Reference numeral 25 is a screw for attaching the movable piece 23 to the arm 17, and 26 is a back yoke.

Even in the third embodiment thus constructed, the same operational effect as that of the first embodiment can be obtained.

FIG. 7 is an explanatory view of the fourth embodiment of the magnetic recording / reproducing apparatus according to the present invention.

The fourth embodiment is an example in which two VCM magnets are used, and the lower yoke 2 also has VCM magnets 2.
7 are arranged. The rest of the configuration is the same as that of the third embodiment, and the fourth embodiment also has the same effects as the third embodiment.

Next, a fifth embodiment of the magnetic recording / reproducing apparatus according to the present invention will be described. FIG. 8 is a plan view of the essential parts of the fifth embodiment.

In the fifth embodiment, as shown in FIG. 8, a film made of polyimide, fluorine, Teflon, or the like is attached to the elastic body 33 attached so as to surround the latch magnet 34 of the latch mechanism, or The lubrication surface 36 is formed by coating or the like. 30 is a back yoke.

With such a lubricating surface 36, in the fifth embodiment, the increase of the attraction force at a low temperature can be significantly reduced, so that the latch magnet 34 of the latch mechanism can be reduced.
The amount of current required to release (separate) the movable piece 32 of the actuator 31 from the voice coil 35 to the voice coil 35 is small, so that the speed and acceleration of the actuator 31 (magnetic head) at the time of release can be kept low. , The control of the actuator 31 at the time of release becomes easy.

Although the lubricating surface 36 is formed on the surface of the elastic body 33 in FIG. 8, conversely, even if the lubricating surface is formed on the surface of the movable piece 32 by the same method. The effect does not change, and even if an elastic body is attached so as to surround the movable piece 32 and a lubricating surface is formed on the surface of the rack magnet by a similar method, the effect does not change.

[0033]

According to the invention of claim 1, a magnet latch mechanism for latching an actuator and a VC are provided.
It is possible to provide a magnetic recording / reproducing apparatus in which the influence of the magnetic interference of M with the magnetic circuit is lessened to the actuator, and the magnetic head can be accurately controlled.

According to the second aspect of the present invention, the attraction force between the movable piece (iron piece) attached to the actuator and the latching magnet is not increased, and the speed and acceleration of the actuator (magnetic head) at the time of release are increased. It is possible to provide a magnetic recording / reproducing device which can be suppressed to a low level and in which the control of the actuator at the time of release is facilitated.

[Brief description of drawings]

FIG. 1 is a plan view of a main portion of a first embodiment of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 2 is an explanatory view seen from the direction of arrow A in FIG.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is an explanatory diagram of a second embodiment of the magnetic recording / reproducing apparatus according to the present invention.

FIG. 5 is an explanatory diagram of a third embodiment of the magnetic recording / reproducing apparatus according to the present invention.

FIG. 6 is an enlarged view of a main part of FIG.

FIG. 7 is an explanatory diagram of a fourth embodiment of the magnetic recording / reproducing apparatus according to the present invention.

FIG. 8 is a plan view of a main portion of a fifth embodiment of the magnetic recording / reproducing apparatus according to the present invention.

FIG. 9 is an enlarged view of a main part of a magnetic recording / reproducing apparatus according to a conventional example.

[Explanation of symbols]

 1 Upper yoke 2 Lower yoke 10,31 Actuator 11,22 Latch magnet 12,23 Movable piece 13,27 VCM magnet 14 Latch mechanism elastic body 15 Voice coil 16 Actuator fixed arm 17,24 Arm 36 Lubrication surface A, C, E polar surface

Claims (2)

[Claims] 1. A voice coil of an actuator is arranged between upper and lower plates facing each other that constitute a yoke, and the actuator is operated by interaction between a current flowing through the voice coil and a permanent magnet arranged on at least one of the upper and lower plates. In a magnetic recording / reproducing apparatus for driving and moving a magnetic head mounted on the actuator in a radial direction of a magnetic disk, the actuator is fixed at a height position of an upper plate or a lower plate on which the permanent magnet is arranged. A magnetic recording / reproducing apparatus in which a latching magnet and a movable piece of a magnet latching mechanism are arranged. 2. A magnetic recording / reproducing apparatus for moving a magnetic head in a radial direction of a magnetic disk by driving an actuator, wherein a movable latching piece of a magnet latching mechanism for fixing the actuator or the latching magnet itself of the actuator. Or a magnetic recording / reproducing apparatus in which a film of polyimide, fluorine, Teflon (registered trademark) or the like is attached or coated on at least one of elastic materials arranged so as to be in contact with them.