JP2605958B2 - Support device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head support device in a disk device for recording or reproducing information magnetically or optically on a recording medium.

2. Description of the Related Art In a disk device that records information on a recording medium at a high density or reproduces information from now on, a head accesses the information track formed on the recording medium with high precision at the time of recording or reproducing the information. Is provided for the head.

Hereinafter, an example of the above-described conventional support device will be described with reference to the drawings.

FIG. 6 is a schematic view of a magnetic head supporting device which is an example of a conventional supporting device. The x-axis in the figure indicates the tangential direction, the y-axis indicates the tracking direction, and the z-axis indicates the focusing direction. 31 is a base in the magnetic head support device. Reference numerals 32a and 32b denote leaf spring holders fixed to the base 31 and having parallel flat surfaces disposed so as to face each other in the tracking direction (y-axis direction). 33a and 33b are metal leaf springs elastically deformed into an arc shape. The metal leaf spring 33a has one end fixed to the leaf spring holder 33a by a leaf spring fixing member 34a, and the other end fixed to the mover by a leaf spring fixing member 34b.
The metal plate spring 33b is also fixed in the same manner as the metal plate spring 33a, and the description is omitted. Reference numeral 35 denotes a back plate of the metal leaf spring 33a, which is a flat plate whose longitudinal direction is in the tracking direction (y-axis direction), and is fixed to the mover by a leaf spring fixing member 34b. Although not shown in the drawing, a back plate of the metal leaf spring 33b is disposed at a symmetric position. Numeral 36 denotes a drive coil of the mover. Both ends are supported symmetrically with respect to the tracking direction (y-axis direction) by metal leaf springs 33a and 33b via a pair of back plates 35. Numeral 40 denotes a magnetic head, which is supported by a mount member 38 via a flexure 39. Reference numeral 37 denotes a coil bobbin fixed to the drive coil 36, to which the mount member 3 having the magnetic head 40 is fixed. Reference numeral 41 denotes a magnetic yoke, two of which are symmetrically arranged with respect to the center axis of the mover parallel to the tracking direction (y-axis direction).
Fixed to 31. Reference numeral 42 denotes a permanent magnet which is arranged to face the drive coil 36 in the focusing direction (z-axis direction), and is fixed to the magnetic yoke 41.

The operation of the conventional support device configured as described above will be described below. By applying a drive current to the drive coil 36, the mover moves in the tracking direction (y-axis direction) by a known drive method. At this time, since the mover is supported by the metal plate springs 33a and 33b so as to be movable in the tracking direction (y-axis direction), the mover can be moved substantially linearly in the tracking direction (y-axis direction). Therefore, the magnetic head 40 accesses a target information track.

Problems to be Solved by the Invention However, the metal leaf spring configured as described above has a structure in which rigidity is high in the direction of the arc axis but low in the direction orthogonal to the arc axis. Therefore, in the conventional example, the rigidity in the tangential direction (x-axis direction) is weaker than the rigidity in the focusing direction (z-axis direction).
And the access operation becomes unstable.

In view of the above problems, the present invention provides a small supporting device that has high rigidity in both the x-axis direction and the z-axis direction, stably supports a movable portion, and performs access control in the same use space as in the related art. is there.

Means for Solving the Problems In order to solve the above problems, a supporting device of the present invention comprises a movable element, and a substantially symmetrical position relative to a moving direction of the movable element for supporting the movable element so as to be movable in a predetermined direction. A pair of support members, and a base that opposes the mover and supports the mover via the support member, the support member is made of at least two or more strip-shaped elastic members, The elastic member is elastically deformed into an arc shape around an axis perpendicular to the moving direction of the mover, and one end of the arc-shaped outer peripheral surface is set to the mover, and the other end of the arc-shaped outer peripheral surface is set to the other end. The direction of the arc axis of at least two of the two or more elastic members is fixed to the base, and the arc axis of the other elastic member is inserted into the arc-shaped internal space of one of the elastic members. Including.

According to the present invention, the rigidity of the support member in the tracking direction (y-axis direction) is small, but the rigidity is high in both the tangential direction (x-axis direction) and the focusing direction (z-axis direction). In addition, stable access control can be performed without disturbing the position of the mover against external vibration.

In addition, by using a configuration in which the arc-shaped internal space of one elastic member includes the arc axis of another elastic member having a different direction of the arc axis, the use space of the support member can be reduced,
It becomes easy to make the device thinner and smaller.

Embodiment Hereinafter, a supporting device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view schematically showing a magnetic head supporting device according to an embodiment of the present invention. FIG. 2 is a side view of the magnetic head supporting device according to the embodiment of the present invention, and FIG. 3 is a plan view of the magnetic head supporting device according to the embodiment of the present invention.

Reference numeral 1 denotes a base in the magnetic head support device.
Reference numerals 2 and 2 'denote a pair of thin plate holders fixed to the base 1, which are arranged to face each other in the tracking direction (y-axis direction). The sheet holder 2 has two planes 2a and 2b. In the drawings, only one of the pair is shown in detail to avoid unnecessary complication and facilitate understanding. 3
Is a mover, which comprises a coil bobbin 4, a drive coil 5, back plates 6, 6 ', a mount member 7, a flexure 8, and a magnetic head 9. A pair of back plates 6 and 6 ′ are disposed at both ends of the drive coil 5 fixed to the coil bobbin 4 so as to face each other in the tracking direction (y-axis direction). The back plate 6 has planes 6a and 6b facing parallel to the planes 2a and 2b of the thin plate holder 2. Similarly, the back plate 6 'also faces the thin plate holder 2'. Further, a mount member 7 having flexures 8a to 8d having magnetic heads 9a to 9d attached to the tips is fixed to the coil bobbin 4. Reference numerals 10 and 10 'denote a pair of support members disposed at symmetrical positions relative to the moving direction of the mover 3. The support member 10 is composed of two conductive thin metal plates 10a and 10b which are band-shaped elastic members elastically deformed into an arc shape around an axis perpendicular to the moving direction of the mover 3. Then, the arc axis of the metal sheet 10a is different in the focusing direction (z-axis direction), the arc axis of the metal sheet 10b is in the tangential direction (x-axis direction), and the arc axes of the metal sheet 10a are different from each other. The structure includes the metal sheet 10b in the space. The metal thin plate 10a has one end fixed to the flat surface 2a of the thin plate holder 2 by a fixing member 11a,
The plane 6 of the back plate 6 of the mover 3 is fixed by the fixing member 11b.
It is stuck to a. Similarly, the metal thin plate 10b has one end fixed to the plane 2b of the thin plate holder 2 by a fixing member 11c, and the other end fixed to the plane 6b of the back plate 6 of the mover 3 by a fixing member 11d. The support member 10 'has the same configuration as the support member 10 and is fixed to the thin plate holder 2' and the back plate 6 'of the mover 3. The drive coil 5 has one end connected to the support member 10 and the other end connected to the support member 10 '. 12
Is a magnetic yoke, in the tracking direction (y-axis direction)
Are arranged symmetrically with respect to the center axis of the mover parallel to the above, and both are fixed to the base 1. Reference numeral 13 denotes a permanent magnet which is arranged to face the drive coil 6 in the focusing direction (z-axis direction), and is fixed to the magnetic yoke 12.

The two magnetic yokes 12 and permanent magnets 13 are arranged symmetrically with respect to the center axis of the mover, but in FIG.
Are omitted.

The operation of the magnetic head supporting device configured as described above will be described below.

The thin metal plates 10a, 10b, 10'a, and 10'b support the mover 3 movably in the tracking direction (y-axis direction) by moving the position of the elastically deformed arc. Moreover, the arc axes of the thin metal plates 10a and 10'a are different from each other in the focusing direction (z-axis direction), and the arc axes of the thin metal plates 10b and 10'b are different in the tangential direction (x-axis direction). As a result, the rigidity in the directions other than the tracking direction (y-axis direction) is remarkably improved as compared with the related art.

By applying a drive current to the drive coil 5 through the support members 10 and 10 'made of a conductive thin metal plate, the mover 3 is moved in the tracking direction (y-axis direction). When the mover 3 moves, the metal sheets 10a, 10b, 10'a, 10 '
The arc portion of b moves by a half of the moving distance of the mover 3, and the thin metal plates 10a, 10b, 10'a, 10'b are moved to the thin plate holders 2, 2 'and the back plates 6, 6'. The mover 3 can move linearly in the tracking direction (y-axis direction).

As described above, according to this embodiment, the rigidity of the support member in the tracking direction (y-axis direction) is small, but the rigidity in both the tangential direction (x-axis direction) and the focusing direction (z-axis direction). Since the height is high, stable access control can be performed without disturbing the posture of the mover with respect to external vibration.

Further, since the support member is configured to include another thin metal plate b in the annular space of the thin metal plate, the support mechanism of the mover can be configured in substantially the same occupied space as in the conventional example. Suitable for miniaturization and miniaturization.

Further, since the support member is made of a conductive material, it also functions as a power supply line for supplying a drive current to the drive coil 5.
It is possible to stably support the mover and perform access control without giving an unnecessary load to the mover with a simple structure.

By the way, when the device is miniaturized, the magnetic circuit composed of the magnetic yoke and the permanent magnet and the support member come close to each other, which is affected by magnetic flux leakage from the magnetic circuit. The circuit is sucked and the access becomes unstable. In this case, by configuring the support member with a non-magnetic material, such a disadvantage can be avoided, and stable access control can be performed.

In the embodiment described above, the support member is constituted by two elastic members, but may be constituted by a single thin plate as shown in FIG. FIG. 3 is a configuration diagram of a support member according to a second embodiment of the present invention, and FIG. 4 is a developed view of the support member of the second embodiment.

The thin plate 14 constituting the supporting member is punched into an H shape shown in FIG. By bending the central portion of the thin plate 14 and making the opposite ends of the H shape close to each other, two annular elastic members shown in FIG. 3 can be formed.

Since the support member of the second embodiment is composed of a single thin plate, the structure is simpler than that of the first embodiment, and has excellent assemblability and assembling accuracy, and the effect is great.

Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 5 is an exploded perspective view of a main part of a third embodiment of the present invention. It should be noted that the same reference numerals as those in FIGS. 1 and 2 denote the same parts, and a description thereof will be omitted. Reference numeral 41 denotes a support member, which is composed of three conductive thin metal plates 41a, 41b, and 41c, which are band-shaped elastic members elastically deformed into an arc shape around an axis perpendicular to the moving direction of the mover 3. . The thin metal plates 41a and 41c have their arc axes arranged in the focusing direction (z-axis direction) and the thin metal plates 41b have their arc axes arranged in the tangential direction (x-axis direction). As shown in the figure, elastic members having different arc axes are arranged in a chain without contacting each other. Metal sheet 41a
One end is fixed to the flat surface 2a of the thin plate holder 2 by the fixing member 11a.
And the other end is fixed to the plane 6a of the back plate 6 of the mover 3 by the fixing member 11b. The metal thin plate 41c is also fixed with the same configuration. One end of the metal sheet 41b is
The thin plate holder 2 is fixed to the flat surface 2b by the fixing member 11c, and the other end is fixed to the back plate 6 of the movable element 3 by the fixing member 11d.
Is fixed to the plane 6b. Note that a support member having the same configuration as the support member 41 is also provided at the other end of the mover 3.
In the figure, they are omitted to avoid unnecessary duplication.

Needless to say, the same effect as that of the first embodiment can be obtained with this configuration.

Furthermore, in this embodiment, since a large number of elastic members can be arranged, the support of the mover can be stabilized, and a support device having excellent linearity can be provided. The device is particularly suitable for a small-stroke support device.

Advantageous Effects of the Invention As described above, the present invention provides a mover, and a pair of support members disposed at substantially symmetric positions relative to a moving direction of the mover that supports the mover in a predetermined direction; A base that opposes the mover and supports the mover via a support member, wherein the support member includes at least two or more belt-like elastic members, and the elastic member is configured to move in a direction in which the mover moves. Elastically deformed into an arc shape about an axis perpendicular to
One end of the arc-shaped outer peripheral surface is fixed to the mover, the other end of the arc-shaped outer peripheral surface is fixed to the base, and the direction of the arc axis of at least two of the two or more elastic members. The support member has a small spring stiffness in the moving direction of the mover and a high spring stiffness in the radial direction different from the moving direction of the support member, thereby breaking the posture of the mover against external vibrations. And stable access control can be performed.

In addition, by using a configuration in which the arc-shaped internal space of one elastic member includes the arc axis of another elastic member having a different direction of the arc axis, the use space of the support member can be reduced,
It becomes easy to make the device thinner and smaller.

Further, the support member is made of a single H-shaped thin plate, the center of which is bent, and the opposite ends of the H shape are brought close to each other to form two annular elastic members. A supporting device with excellent assembling accuracy can be provided, and the effect is great.

In addition, the elastic members constituting the support member have an annular shape, and the elastic members having different arc axes are arranged in a chain without contact with each other, so that a large number of elastic members can be arranged, so that the movable element is further supported. It is possible to provide a supporting device that is stable and has better linearity.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view schematically showing a magnetic head supporting device according to an embodiment of the present invention, FIG. 2 is a plan view of the magnetic head supporting device according to the embodiment of the present invention, and FIG. FIG. 4 is a configuration diagram of a support member according to a second embodiment, FIG. 4 is an exploded view of the support member according to the second embodiment of the present invention, FIG. 5 is an exploded perspective view of a main part of the second embodiment of the present invention, FIG. 6 is a schematic diagram of an optical system driving device according to a conventional example of the present invention. DESCRIPTION OF SYMBOLS 1 ... Base, 2, 2 '... Thin plate holder, 3 ... Mover, 4 ... Coil bobbin, 5 ... Drive coil, 6, 6' ... Back plate, 7 ... Mounting member, 8 ... ... flexure, 9 ... magnetic head, 10,10 '... support member, 10a-d ... metal sheet, 11a-d ... fixing member, 12 ... magnetic yoke, 13 ... permanent magnet.

Claims (4)

(57) [Claims] A movable member, a pair of support members movably supporting the movable member in a predetermined direction, and disposed at substantially symmetric positions with respect to a moving direction of the movable member; A base for supporting the mover via the support member, wherein the support member is made of at least two or more belt-shaped elastic members, and the elastic member is perpendicular to the moving direction of the mover. Two ends of an arc-shaped outer peripheral surface are fixed to the mover, the other end of the arc-shaped outer peripheral surface is fixed to the base, and two or more elastic members are fixed. A support device, wherein the directions of the arc axes of at least two elastic members are different, and the arc-shaped internal space of one elastic member includes the arc axis of the other elastic member. 2. The support member is made of one H-shaped thin plate,
2. The support device according to claim 1, wherein the center portion is bent and the opposite ends of the H shape are brought close to each other to form two annular elastic members. 3. The supporting device according to claim 1, wherein the elastic members forming the supporting member have an annular shape, and the elastic members having different arc axes are arranged in a chain without contacting each other. 4. The supporting device according to claim 1, wherein the elastic member is a non-magnetic thin metal plate.