JPS5857829B2 - Transducer support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic transducer particularly suitable for use in connection with a flexible YV magnetic disk, and more particularly to a spring-loaded support arrangement for such a magnetic transducer. .

U.S. Pat. No. 4,089,029 discloses a technique for mounting a magnetic transducer on a cantilevered gimbal spring having a pair of parallel opposing legs connected by a transverse leg for mounting the transducer. ing.

These legs support the pitching of the transducer (
i.e., exhibits elasticity against vertical movement of the leading and trailing edges of the transducer along the magnetic track, and exhibits resilience against and tolerates rolling of the transducer about an axis perpendicular to the magnetic track. .

A relatively stiff load arm with a spring load applied forces the transducer into tight contact with the disk.

This is due to the action of the projection and flange portion of the load arm forming a kind of universal joint.

The transducer is therefore free to pitch and roll without being affected by the load arm.

It is an object of the present invention to provide a spring support device for a transducer which is particularly suitable for use in connection with a flexible disk which has the property of moving considerably in the direction of the axis of rotation during rotation.

More specifically, it is an object of the present invention to provide a symmetrical flat gimbal spring for symmetrically mounting a transducer so that the gimbal spring's elasticity against pitch and roll of the transducer is uniform. The goal is to provide the following.

Yet another object of the invention is to provide a backup spring in a folded configuration that acts on the gimbal spring and the transducer through a universal joint consisting of a recess in the gimbal spring and a flange portion of the backup spring perpendicular to the main axis of the transducer. It is to provide.

The backup spring has dimensions and sections such that the flange portion remains parallel to its original position upon translational movement of the disk (i.e., movement in a direction perpendicular to the plane of the disk and parallel to its axis). It is characterized by an arrangement of

Yet another object of the invention is to provide an improved transducer support carriage having a swingable arm for supporting a transducer.

The carriage has a contact surface for supporting the arm in a position to bring the transducer into contact with the disk.

The arm remains in this position and does not become a moving element of the transducer in such a situation.

In FIG. 1, the transducer carriage 70V is replaced by the transducer carriage γ disclosed in U.S. Pat. No. 4,089,029.
0 is used in data storage devices such as those shown here.

It should be noted that among the plurality of parts or parts of the converter carriage 70V, those marked with a reference symbol with a ■ have the same reference symbol without a V in the converter carriage 70 disclosed in the above-mentioned U.S. patent. Corresponds to parts or parts marked with .

Carriage 70V has two rigid carriage parts 72V
and 74V, which include PolN12V and Nattu1
It is fixed by 14V and 116V.

The carriage portion 74V has a hole for receiving a guide rod for reciprocatingly mounting the carriage 70V.

One of them is 80V, and it has a guide rod of 76V.
is inserted.

The carriage 70V has swingable rigid arms 104 and 106, which are supported by leaf springs 108 and 110.
It is attached so as to be swingable with respect to the carriage parts 72V and 74V by (2).

The leaf spring 108■ is connected to the spacer 120■ and the return leaf spring 11.
It is attached to +N12V with nut 114V along with 8■.

The plate spring 110■ is the spacer 124■ and the return plate spring 11
It is attached to the pole l-112V with nut 116■ together with 6■.

Return leaf springs 118 and 122 are different from the leaf springs 118 and 122 disclosed in the above-mentioned U.S. patent in that they are bent in opposite directions, but they serve the same purpose as similar leaf springs 118 and 122 of arms 104 and 106. Protrusions 126■ and 128
■It is in contact with.

Arms 104* and 106* move outwardly relative to each other, at which time leaf springs 108* and 110* bend.

Also, as the arm 104■ moves outward, the arm 10
6■ to the outside, arms 104■ and 106■
are provided with interaction portions 104aV and 106aV.

A hook 148■ is attached to the arm 104■, and the arm 104■ is moved by means (not shown) that engages the hook 148■.

Carriage portions 72V and 74V are provided with stop surfaces 72bV and γ4bV for limiting the approach movement of arms 104■ and 106■, respectively.

Additionally, carriage portion 74V has a stop surface 74cV for limiting outward movement of arm 106.

Carriage parts 72V and 74V are each part 302
and 304.

The configurations disclosed in the above-mentioned US patents do not contain corresponding parts.

Portions 302 and 304 are connected to arms 104 and 106.
It is located inside the base end portions 104Va and 106Va of and protrudes in the direction of the tips 104Vb and 106Vb of these arms.

Therefore, portions 302 and 304 are connected to arms 104 and 10.
When 6■ is closest, the base end 104Va
and 106 Va.

In addition, in this state, the tips 104Vb and 106V
b is supported by stop surfaces 72bV and 74bV.

Arm 104* supports transducer 150*.

The transducer 150■ has a relatively wide surface 150Vw and a narrow surface 150Vx for contacting the magnetic disk 20V (see FIG. 3).

Further, the transducer 150■ has a leading edge 150Vy and a trailing edge Vz from the viewpoint of the moving direction A of the magnetic disk 20V.

Surfaces 150Vw and 150Vx extend along direction A and form a working surface 150Va of transducer 150.

The arm 106■ has a working surface 152Va.
52■ is supported.

Transducers 150■ and 152■ have surfaces 150 with different widths.
It is similar to converters 150 and 152 disclosed in the aforementioned US patent, except that it has Vw and 150Vx, etc.

Converters 150■ and 152■ face each other with a disk 20V in between.

The nominal plane of disk 20V is parallel to the guide bars, including guide bar 76b.

Transducer 150* is supported relative to arm 104* by support assembly 306.

Transducer 152* is supported relative to arm 106* by support assembly 307.

Support assemblies 306 and 307 are identical except that they are rotated 180 degrees from each other.

The support assembly 306 has a figure 8 shaped sheet metal gimbal spring 308 and a bidirectionally extending backab spring 310.

As shown in FIG. 6, the gimbal spring 308 has a central portion 308a, two side portions 308b and 308c.
, two connecting portions 308d and 308e connecting these portions, and two attachment tabs 308f and 308g.

The central portion 308a has an extension portion 308h and the transducer 1
50■ is due to the bonding material inserted into the hole 3081.
It can be attached to the back of both.

Transducer 150■ has approximately the same length as extension portion 308h, with central portion 308a being considerably longer.

The ratio between the length of the central portion 308a and the length of the transducer 150 is, for example, 4:1.

The central portion 308a and both side portions 308b, 308c have the same length and approximately the same width.

That is, gimbal spring 308 has symmetry.

Connecting portions 308d and 308e are connected to portions 308a, 308
b, considerably shorter than 308c.

As can be seen from the figures, portion 308a is centrally located with respect to portions 308d and 308e.

Tabs 308f and 308g correspond to portions 308b and 308c.
It protrudes outward at right angles at the center.

Tabs 308f, 308g and members 308d, 308e have approximately the same width.

Because gimbal spring 308 is formed from a single piece of spring metal of uniform thickness, tab 308f.

308g and the resistance to deflection of sections 308a-308e vary proportionally with the widths of these sections.

Arm 104* has a pair of flanges 312 and 314, and tabs 308f and 308g of gimbal spring 308 are molded into these flanges.

In this case, each part is made so that the tabs 308f and 308g on the outside of the flanges 312 and 314 are relatively short, specifically, slightly shorter than twice the width of each of the parts 308a, 308b, and 308c. Dimensions are determined.

A protrusion 176hV is formed in the portion 308a.

The protrusion 176bV is the working surface 150Va of the converter 150■
, the center line Z passing through its dimensional center and perpendicular to
(See Figure 5).

More specifically, the protrusion 176hV is offset by about 0.05 mm from the center line Z toward the wide contact surface 150Vw,
In addition, approximately 0.0.
It is desirable to be located at a position 10 mm closer.

The relationship between the transducer 150■ and the protrusion 176hV is almost the same as the relationship between the transducer 150 and the protrusion 176h disclosed in the above-mentioned U.S. patent, but one difference is that when the disk 20V rotates at high speed, the transducer Even if the contact surface is slightly raised from the surface of the disc, the contact surface should be 150Vw and 1
The position of the protrusion 176hV is shifted in order to maintain a substantially uniform pressure of 50Vx on the disk 20V.

Slot 30 in portion 308a as shown in FIG.
8j is formed by punching a protrusion 176.
In the process of forming the hV, the portion 308a and the extended portion 3
This is to prevent buckling of 08h.

Portion 308a connects to U-shaped lug 308 for clamping appropriate wiring on transducer 150 and to ground lug 30.
It has a length of 8m.

As shown in FIG. 4, backup spring 310 has three parallel sections 310a, 310b, 310c.

Portions 310d and 310e are portions 310a and 310
b is connected.

Portions 310f and 310g are portions 310b and 310
c is connected.

Portion 310a is supported by step 316 and retained there by post 318.

Portions 310d and 310e are from portion 310a to portion 31.
0b, the portions 310f and 310g move away from the converter 150■.
10b to section 310c.
■It seems to be moving away from.

The portion 310h extends from the portion 310c to the projection 176hV and the transducer 150, and has a flange portion 182gV at its tip that contacts the projection 176hV.

As can be seen from FIGS. 4 and 5, portions 310f and 3
10g is in a folded relationship with respect to portions 310d and 310e, and portion 310h is in a folded relationship with respect to portions 310f and 310.
There is a folded relationship with respect to g.

The spring action of backup spring 310 forces flange portion 182gV against protrusion 176bV and is substantially parallel to backup spring 308 and disk 20V.

Flange portion 182gV and projection 176hV form a type of universal joint similar to flange portion 182g and projection 176h of carriage 70 disclosed in the aforementioned US patent.

As previously mentioned, support assembly 307 is similar to support assembly 3.
It corresponds to the same as 06 but rotated 180 degrees.

Transducers 150 and 152 have backup springs 3 that apply pressure to protrusions 176hV on each support assembly.
10 is pressed against both sides of the disk 20V, and in this state, the converters 150■ and 152■
A data transfer operation is performed between the disk 20V and the disk 20V.

When backup spring 310 is attached to flange 312, portions 310d, 310e.

310f and 310g are bent outward (that is, in a direction away from the gimbal spring 308) by the restoring force of the gimbal spring 308.

The condition of backup spring 310 prior to attachment to flange 312 is shown in FIGS. 7 and 8.

In this state, the portion 310h and the flange portion 18
With the exception of 2gV, the backup spring 310 is flat.

The backup spring 310 can be made by etching a uniform thickness of leaf spring metal.

Portion 310h and flange portion 182gV are also initially in the same plane as the other portions, but are pulled outwards as clearly shown in FIG.

In the non-flat state before the backup spring 310 is attached to the flange 312, the flange portion 182gV
is α with respect to a plane parallel to the portions 310a to 310g.
(for example, 4°).

When backup spring 310 is attached to flange 312, portions 310d and 310e are attached to gimbal spring 3.
08, the portions 310f and 3
10g can also be bent in the same direction.

At this time, the flange portion 182gV at the tip of the downwardly extending portion 310h is connected to the protrusion 176 of the gimbal spring 308.
Contact hV.

As the backup spring 310 is subjected to the force exerted by the gimbal spring 308, the flange portion 182gV becomes substantially parallel to the gimbal spring 308.

On the other hand, the gimbal spring 308 also has a backup spring 310.
By supporting in this way, the transducer 150 is not in a truly flat state but in a slightly bent state (provided that the transducer 150 is not in contact with the disk 20V).

Arms 104 and 106 are moved into contact with each other to remove gimbal spring 30 associated with transducer 150.
8 and backup spring 310 are positioned as shown in FIG.
are pushed together with the disk 20V in between, so that the gimbal spring 308 is in a substantially flat state.

FIG. 9 shows the operation of the backup spring 310 when the transducer 150* is in contact with the disk 20V as opposed to the transducer 152*.

Since the portion 310e is fixed to the flange 312 at one end, if the portion 310e were independent, it would act like a cantilever, and when an upward force is applied, the tip of the portion 310e will It rises to the position of the dashed line shown at 310ee and approaches flange 312 slightly.

That is, portion 310e pivots about the fixed end.

Of course, such movement is based on the assumption that portion 310e exists alone, and in reality, as will be described below, such movement does not occur.

That is, in the actual device, the portion 3
The pivot rotation of 10e is suppressed.

In this state, portion 310b is approximately parallel to gimbal spring 308, and portion 310e is slightly S-shaped, as shown in FIGS. 5 and 9.

In the part 310g, the backup spring 310 is connected to the arm 10.
When attached to the flange 312 of 4.4, the gimbal is bent away from the spring 308.

Therefore, the tip of portion 310g will be further away from flange 312 than when portion 310g is parallel to the plane of gimbal spring 308.

If there is no action from other parts, when subjected to an upward force, part 310g will tend to pivot about part 310b and the tip will rise as shown by dashed line 310gg.

This tendency is observed in part 3 connected to part 310g.
10c and 310h.

The flange portion 182gV at the tip of the portion 310h is the protrusion 1
Due to the strong contact with 76hV, portion 310c is approximately parallel to gimbal spring 308.

The portion 310g is S-shaped like the portion 310e.

Portions 310e and 310g extend in opposite directions.

That is, since the portion 310g is folded with respect to the portion 310e, the translational movements of the tips of the portions 310e and 310g are canceled out.

Further, the substantially equal rotational effects of the influence of the portion 310g on the portion 310e and the influence of the portion 310h on the portion 310g cancel out the rotational movement of the tips of the portions 310e and 310g as described above.

In this way, rotation of the flange portion 182gV and movement of the two portions 310e and 310g are suppressed.

Therefore, the flange portion 18 in contact with the protrusion 176bV
The 2 gV movement occurs uniformly only in the direction perpendicular to the gimbal spring 308.

The operation of the backup spring 310 has been explained so far with particular reference to the portions 310e and 310g, but it goes without saying that the portions 310d and 310f also have similar effects.

Portions 310e, 310g and 310h are substantially connected in series, similarly 310d, 310f and 31
0h is also connected in series.

Portion 310e. 310g, 310d and 310f form a balanced structure.

Since sections 310e and 310d are symmetrically spaced apart and sections 310g and 310f are also symmetrically spaced apart, transducer 1502 is not directly related to these sections.

Since the portion 310h has a width approximately twice the width of each of the portions 310d to 310g, the paired portion 310
It is exactly balanced with f and 310g.

Since the portion 310h is shorter than the other portions 310d to 310g, there is less bending than these portions.

Since portions 310e and 310d are attached to flange 312, portion 310a may be omitted.

With the configuration described in detail above, the flange portion 182gV
applies pressure to the protrusion 176hV and acts to push the transducer 150■ toward the transducer 152■.

Note that pressure is also applied to transducer 152* by a similar configuration of support assembly 307.

Disk 20V tends to move somewhat in the axial direction of transducers 150 and 152, which is caused by support assembly 306.
and 307 are resisting the force exerted by spring 310 and resisting the deflection of portions 308a-308e of gimbal spring 308 and tabs 308f, 308g.

Furthermore, a ripple phenomenon may occur for the disk 20V.

Thus, when the various components are in the positions shown in FIG. (on an axis parallel to and perpendicular to the axis of central portion 308a).

As shown in FIG. 3, disk 20V moves in the direction of arrow A across transducer 150.

When the transducer 150■ pitches, the tabs 308f and 308
g is twisted and accordingly portion 308a.

308b and 308c flex, resulting in a restoring force that returns the entire gimbal spring 308 to its original flat state, and thus returns the transducer 150 to its original position.

This also applies to transducer 152* and its corresponding support assembly 307.

In addition, the working surface 150Va of the converters 150■ and 152■
and 152Va are facing each other and are always connected to the disk 20V.
Since the transducers 150■ and 152
It is clear that pitching in (2) occurs in opposite manners.

The 20V disk also tends to move out of plane,
This is in a direction perpendicular to the pitching direction and in the central portion 30.
8a causes transducer 150 to roll on an axis parallel to axis 8a.

At this time, the portion 308a functions to return the transducer 150 to its original position by returning to its original flat state.

Transducers 150 and 152 are maintained in contact with opposite sides of disk 20V and support assembly 307 operates similarly to support assembly 306 with respect to transducer 152 so that transducer 152 is in the opposite position from transducer 150. It causes lateral sway.

Gimbal spring 308 has symmetry.

That is, portions 308a, 308b, and 308c have equal lengths and are equally spaced apart.

Portions 308d and 308e are of equal length.

Tabs 308f and 308g are part 308d and 308e
It is located in the center.

Thus, gimbal spring 308 has a resiliency such that it can produce equal forces to restore transducer 1502 during pitching and rolling of transducer 1502.

When pitching or rolling occurs, the transducer 150
76hV and pivots about the universal joint formed by flange portion 182gh.

The width and length of the parts 308a to 308e and the tabs 308f and 308g of the gimbal spring 308 are (disc 20V
, and thus the transducer 150 (centered on an axis parallel to the disk 20V and perpendicular to the section 308a) in the direction of movement of the track that the transducer 150 follows. There is.

Because section 308a is relatively long (i.e., approximately four times the length of transducer 150 along section 308a), section 30
8a exhibits a proper elastic response to transducer 150's rolling about an axis parallel to axis 8a.

Portions 310f and 310g are portions 310d and 310e.
Backup spring 310 in the folded configuration extending in the opposite direction provides a spring with a uniform spring rate that maintains gimbal spring 308 flat in its original plane.

The transducer 20V moves in translation (parallel to the rotational axis of the disk 20V and the transducer main axis Z, and the working surface 1 of the transducer 150
The folded configuration of the backup spring 310 causes the flange portion 182gV to remain approximately parallel to the original plane of the gimbal spring 308 and to the plane of the disk 20V, although this may result in slight movement in the direction perpendicular to the gimbal spring 308. stay.

Therefore, during translational movement of disk 20V that disrupts the force relationship between transducers 150 and 152 and disturbs the alignment of the transducers with the tracks, flange portion 182gV acts like a cantilever. and does not generate lateral forces.

The combination of the flat gimbal spring 308 and the folded backup spring 310 decouples the roll and pitch and translation of the transducer 150 and eliminates the problem of the associated transducer going off track. .

This isolation of roll, pitch, and translation, and the fact that the backup spring 310 provides a very uniform spring constant, primarily contributes to the roll-resisting portion of the transducer. 308a and tabs 308f and 308g, which primarily resist transducer pitch, combine to meet specific stiffness requirements and specific dynamic response criteria between the transducer and the disk.

Additionally, the folded configuration of backup spring 310 allows for a relatively compact transducer support arrangement that requires little space on arm 104.

Additionally, since the support assemblies 307 and 308 are identical and consist only of a gimbal spring 308 and a backup spring 310, respectively, the overall design is easy to manufacture.

All the matters mentioned regarding converter 150■ are applicable to converter 15.
This also applies to 2■.

However, the two transducers are opposite each other with a disk in between, and each support assembly has a backup spring 310.
The pitching, rolling, and translation of the two transducers occurs in a complementary or opposite manner as they are pressed together by the action of the transducers.

Arms 104■ and 106■ are the first for data transfer.
When placed in close proximity as shown, base ends 104Va and 106Va are pressed against carriage portions 72V and 74V, and tip 1
04Vb and 106Vb are contact surfaces γ2bV and 74bV
Since the arms 104■ and 106
(2) is firmly supported with respect to carriage portions 72V and 74V.

Transducers 150 and 152 are thus firmly positioned with respect to carriage portions 72V and 74V, and their working surfaces 150Va and 152Va are in correct parallelism without deviation due to deflection of gimbal spring 108 and backup spring 110. will be maintained.

As shown in Figure 5, the protrusion 176hV is located a little to the left of the axis Z, and the front edge is 150V a little more than the rear edge 150Vx.
By forming the contact surface 150 at a position close to y,
Even if Vw is wider than the contact surface 150Vy, or even if the leading edge 150Vy rises above the disk 20V when the disk 20 rotates at high speed, the contact surface 150Vw and 15
0Vx can maintain a substantially uniform pressure relationship as an overall working surface for the disk 20V.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional view of a device for supporting a pair of transducers that contact an intervening disk from both sides (1-1 in Figure 2).
2 is a plan view of one arm and support assembly taken from the side of line 2-2 in FIG. 1; FIG. 1
4 is a perspective view of the support assembly; FIG. 5 is a cross-sectional view of the support assembly taken along lines 5-5 in FIG. 4; and FIG. Figure 7 is a top view of the backup spring before attachment to the flange of the arm; Figure 8 is a side view of the backup spring of Figure 7; Figure 9 is a side view of the backup spring after it has been attached to the flange of the arm; 104 ■ and 106 ■ ... Arm, 150 ■ and 152 ■ ... Converter, 308 ... Gimbal spring, 310 ... Backup spring.

Claims (1)

[Claims] 1. A rigid support, a gimbal spring attached to the support, a transducer attached to the gimbal spring, and a rigid support that applies pressing force to the transducer. and a back-up spring, wherein the gimbal spring is made entirely from a single piece of thin plate-like spring material and has three parallel narrow strip spring sections connected to each other at both ends. The transducer is mounted approximately at the center of the central spring portion, and narrow tab portions are formed approximately at the center outer sides of both spring portions, and the free ends of these tab portions are fixed to the support body. All of the narrow portions have elasticity to twist and flex and restore in response to external forces, thereby maintaining the transducer in a constant position relative to the recording medium, and the backup spring is entirely uniform. The outer quadrilateral part is supported in a cantilever shape on one side by a support, and the part is connected to the free end part of the quadrilateral part provided inside the quadrilateral part. From here, an intermediate portion is formed in the shape of a cantilever toward the supported side, and extends from the free end of the intermediate portion so as to apply pressing force to the transducer in a point contact manner. A transducer support device having a section.