JPH0417172A - Floating head lift device - Google Patents

Abstract

PURPOSE:To easily make a lift quantity almost constant, to reduce number of components and to make the profile of the device thin by arranging a slide plate advanced or retreated freely along the surface of a suspension toward a recording medium into a slot freely slidably formed on a support member. CONSTITUTION:A slide plate 25 advanced or retreated freely along the surface of a suspension 8 supporting a floating head 5 toward a recording medium 1 is provided and arranged into a slot 23 freely slidably formed on a support member 10. When the suspension 8 is lifted up, the slide plate 25 is advanced along the surface of the suspension 8 opposite to the recording medium 1. The suspension 8 is lifted up to a height where the suspension 8 is almost mated to provide a prescribed interval between the floating head 5 and the recording medium 1. Thus, the lift quantity of the floating head 5 is easily made constant, number of components is decreased and the profile of the device is made thin.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floating head elevating device in an information recording/reproducing device using a floating head, such as a magneto-optical disk device.

[Conventional technology]

In recent years, magneto-optical disks have been developed as optical memory devices capable of recording, reproducing, and erasing information. Magneto-optical disks use a perpendicularly magnetized film as a recording medium, and apply an external magnetic field to the perpendicularly magnetized film in a direction perpendicular to the film surface while heating the perpendicularly magnetized film by irradiating it with laser light and reducing its coercive force. This allows the direction of magnetization to match the direction of the external magnetic field, thereby recording information.

Recording methods for magneto-optical disks can be roughly divided into optical modulation methods, which modulate the intensity of laser light according to the information to be recorded while continuously applying an external magnetic field in a fixed direction, and optical modulation methods, which modulate the intensity of laser light according to the information to be recorded, and methods that irradiate laser light with a fixed intensity. There is a magnetic field modulation method that reverses the direction of the external magnetic field depending on the information to be recorded.

Incidentally, a magnetic field modulation method is seen as a promising method for realizing an override method in which new information is directly recorded without going through the process of erasing old information when rewriting recorded information. In this case, in order to increase the switching speed of the direction of the external magnetic field and improve the transfer rate, it is necessary to reduce the inductance of the magnetic head, but this will reduce the magnetic field strength, so the magnetic head It must be placed as close to the magnetic disk as possible.

However, when a resin such as polycarbonate is used as a substrate for a magneto-optical disk, the surface of the substrate has quite large surface runout (irregularities in the circumferential direction), so when the magnetic head is brought close to the magneto-optical disk, Under the influence of the above-mentioned surface runout, the magnetic head may come into contact with the magneto-optical disk, causing damage to the magnetic head or the magneto-optical disk. Therefore, there is a problem in that the magnetic head cannot be brought sufficiently close to the magneto-optical disk, and the magnetic field strength tends to be insufficient.

Furthermore, as the distance between the magnetic head and the perpendicularly magnetized film changes due to surface runout, the magnetic field strength tends to change.

Therefore, we adopted a floating magnetic head, which is used in magnetic disks, etc., and the magnetic head is biased toward one surface of the magneto-optical disk by a suspension made of a leaf spring, so that it comes into contact with the disk surface when the magneto-optical disk stops. At the same time, it is conceivable to perform recording by causing a floating magnetic head to follow the surface runout as the magneto-optical disk rotates, while keeping a substantially constant minute distance between it and the magneto-optical disk.

By the way, magneto-optical disks are usually not attached to the device and are replaceable, so it is necessary to provide an elevating device to lift the floating magnetic head from the surface of the magneto-optical disk during loading or unloading. Hitherto, such an elevating device for a floating magnetic head has been proposed for a replaceable magnetic disk device, and it is conceivable that the elevating device for a magnetic disk device can also be used in a magneto-optical disk device.

[Problem to be solved by the invention]

However, in that case, the following problems occur. For example, as an elevating device for a floating magnetic head in a magnetic disk device, a swinging member to which one end of a suspension is fixed is swingably connected to a support member via a pivot plate.
There is a structure in which a floating magnetic head is lifted by pressing an inclined surface provided on the swinging member with a bushing rod to swing the swinging member and the suspension (see Japanese Patent Laid-Open No. 1-94576). ).

Furthermore, in the above-mentioned elevating device, instead of pressing the inclined surface of the swinging member with the bushing rod, the supporting member is moved to the outer circumferential side of the magnetic disk together with the suspension and the swinging member, and the inclined surface is pressed against the fixed operating rod. There is also a device in which the suspension and the floating magnetic head are lifted by swinging the swinging member (see Japanese Patent Laid-Open No. 1-94577).

In all of these configurations, the suspension is made to swing together with the swinging member, which increases the number of parts and increases the thickness of the device. Further, as described above, in the case where the swinging member and the suspension are swung by pressing the inclined surface of the swiveling member with a bushing rod or an operating rod, the swiveling angle, in other words, the rift 11 is accurately controlled. If the lift amount is too small, there is a risk that the disk will come into contact with the flying magnetic head when loading or unloading the disk.

The above-mentioned problems not only occur in magnetic disk drives, but also occur when the above-mentioned elevating device is used in magneto-optical disk drives.

[Means to solve the problem]

In order to solve the above-mentioned problems, the floating head lifting device according to the present invention moves the floating head attached to the other end of the suspension, one end of which is fixed to the support member, toward the recording medium side using the biasing force of the suspension. A floating head elevating device provided in an information recording and reproducing device biased by a user has a slide plate that is movable back and forth along the surface of the suspension facing the recording medium, and the slide plate is attached to the support member. It is characterized in that it is slidably disposed within a groove formed in the.

[For production]

In the above configuration, when lifting the suspension, if the slide plate is advanced along the surface of the suspension on the side facing the recording medium, the suspension is lifted to a height where it is almost parallel to the slide plate, and the floating head is A predetermined interval is provided between the recording medium and the recording medium.

In this state, the recording medium can be loaded or ejected without bringing the recording medium into contact with the flying head.

In the above configuration, one end of the suspension is directly attached to the support member so that only the suspension and floating head can be raised and lowered, so the conventional swinging member is no longer required, reducing the number of parts and making the device thinner. can be achieved.

Further, since the suspension is lifted to a height where it becomes substantially parallel to the slide plate by advancing the slide plate, the amount of lift can be easily made substantially constant.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 15.

As shown in FIG. 14(d), a magneto-optical disk device as an information recording and reproducing device includes a spindle motor 2 (driving means) that rotationally drives a magneto-optical disk 1 as a recording medium housed in a cartridge la. , magneto-optical disk 1
is arranged to face one surface (lower surface in the figure) of the magneto-optical disk 1, and irradiates the magneto-optical disk 1 with a laser beam through the objective lens 3 during recording or reproduction, and also irradiates the magneto-optical disk 1 during reproduction.
In addition to detecting information based on the reflected light from
An optical head 4 that is moved in the radial direction of the magneto-optical disk 1 by a moving means such as a linear motor is arranged at a position corresponding to the objective lens 3 on the other surface (the top surface in the figure) of the magneto-optical disk 1. It is equipped with a floating magnetic head 5 that applies a magnetic field to the magneto-optical disk 1 during recording.

As shown in FIGS. 1 and 2(a) and 2(b), the floating magnetic head 5 is activated at the start of rotation of the magneto-optical disk 1 (the cartridge 1a is omitted in FIGS. 2(a) and 2(b)). The slider 6 has a slider 6 that slides along the upper surface of the magneto-optical disk 1 when finished, and a magnetic head main body 7 attached to the slider 6. The slider 6 has a substantially U-shaped support member 10 ( It is supported by the other end of a suspension 8 made of a leaf spring fixed to the upper horizontal part (see FIG. 14(d)).

The lower horizontal portion of the support member 10 is fixed to the optical head 4, and the floating magnetic head 5 is configured to move in the radial direction of the magneto-optical disk 1 together with the optical head 4. As shown in FIG. 7, FIG. 8, and FIG. 9, at both ends in the width direction at approximately the middle portion in the longitudinal direction of the upper surface of the upper horizontal portion of the support member 1O, there is a raised first step portion 21.・21 is provided.

Further, second step portions 22, 22, which are stepped up further than the first step portions 21, are provided at both ends in the width direction at the rear end portion in the longitudinal direction of the upper surface of the upper horizontal portion. As a result, between the opposing first step portions 21 and 21 and the second step portions 22 and 2
A groove 23 is formed between the two holes, that is, at the middle portion in the width direction of the upper horizontal portion.

As shown in FIGS. 11 and 12, one end of the suspension 8 is welded to the lower surface of the metal plate 16, and one end of the metal plate 16 and the suspension 8 are connected to the screws 24 and 24.
It is fixed to the first step portions 21, 21 by.

The suspension 8 has flanges 11 bent upward at both ends in the width direction in a region excluding the protruding base end.
11 is provided, and the portion having the flanges 11 becomes a non-flexible region 12, while only the protruding base end where the flanges 11 are not provided becomes a flexible region 13. The floating magnetic head 5 is biased toward the magneto-optical disk 1 by the biasing force of the bending region 13. As shown in FIG. 2(a), when the magneto-optical disk 1 is stopped, the floating magnetic head 5 is biased toward the magneto-optical disk 1 by the suspension 8 with a biasing force of about 1 to 10 gf, typically about 5 gf. It is pressed against the top surface of the

The upper horizontal part of the support member IO passes below the flexing area 13 of the suspension 8 and extends below the non-flexing area 12 . The front end of the upper horizontal portion is provided with a non-deflecting area 12 that contacts a non-deflecting area 12 when the suspension 8 is bent downward beyond the top surface position of the magneto-optical disk 1 when the magneto-optical disk 1 is loaded when the magneto-optical disk 1 is ejected. Thus, an inclined surface 14 is formed that limits the amount of downward deflection of the suspension 8. This prevents the floating magnetic head 5 from coming into contact with the objective lens 3 even when the magneto-optical disk 1 is ejected.

A slide plate 25 is disposed within the groove 23 in the upper horizontal portion of the support member 10, and the lower surface of the metal plate 16 is in slidable contact with the upper surface of the slide plate 25. As shown in FIG. 11, a linear gear 26 is provided on one side of the rear part of the slide plate 25, and the worm 2 is engaged with this gear 26.
7 by the motor 28, the slide plate 2
The front part of the suspension 5 moves forward and backward along the lower surface of the suspension 8, that is, the surface of the side facing the magneto-optical disk 1.

As a result, as shown in FIG. 2(a), the slide plate 2
When the front end of the magnetic head 5 is retracted at the same or slightly rearward position as the front end of the metal plate 16, the biasing force of the suspension 8 acts effectively to bias the floating magnetic head 5 downward. As shown in FIG. 5B, when the slide plate 25 advances to the non-deflecting region 12 along the lower surface of the suspension 8, the biasing force of the suspension 8 is not applied and the suspension 8 is in a substantially horizontal position. be.

In the above configuration, when loading the magneto-optical disk 1, the optical head 4 and the floating magnetic head 5 are retracted to the outside of the loading position of the magneto-optical disk 1, as shown in FIG. 14(a). Also, at this time, as shown in FIG. 2(b), the front end of the slide plate 25 advances to the non-deflecting area 12 along the lower surface of the suspension 8, and
is assumed to be in an almost horizontal position. In this state, the magneto-optical disk 1 is loaded onto the spindle motor 2 by a loading mechanism (not shown) (Fig. 14 et al.).

Subsequently, the optical head 4 and the floating magnetic head 5 are moved to the inner circumferential side of the magneto-optical disk 1, and the floating magnetic head 5
A CSS (ContactStart an
d5top) region (Figure (C))
.

Then, as the slide plate 25 is retracted backward, the biasing force of the suspension 8 acts, and the floating magnetic head 5 is pressed against the CS S 81 (area (d) in the same figure) on the upper surface of the magneto-optical disk 1. ) and Figure 2(a)).

After that, when the magneto-optical disk 1 starts to rotate for recording or reproduction, the first
As shown in FIG. 4(e), the floating magnetic head 5 flies above the magneto-optical disk 1. If you want to record, use optical head 4.
After moving the floating magnetic head 5 to a desired radial position, a magnetic field may be applied from the floating magnetic head 5 while the optical head 4 irradiates the magneto-optical disk 1 with a laser beam.

If reproduction is to be performed, a laser beam is irradiated from the magneto-optical disk 1, and information is detected based on the reflected light. When recording or reproducing is finished, the floating magnetic head 5 is guided to the above C8S area again, and when the rotation of the magneto-optical disk 1 is finished, the floating magnetic head 5 that has already been levitated moves along the C3S area. It slides and comes into contact with the upper surface of the CS S region again (FIG. 14(d)). After that, if the magneto-optical disk 1 is to be ejected, the suspension 8 is placed in a substantially horizontal position by advancing the slide plate 25, and the floating magnetic head 5 is separated from the top surface of the magneto-optical disk 1 ((C) in the same figure). After that, just do the opposite of what you did when loading.

In addition, as a mechanism for advancing and retracting the slide plate 25, the 11th
The mechanism shown in FIG. 15 may be used instead of the gear 26 and worm 27 shown in the figure. That is, here, the rear end of the slide plate 25 is connected to the movable core 32 of the self-holding solenoid 30 via the spring receiver 31, and the spring 33 is compressed between the self-holding solenoid 30 and the spring receiver 31. It is set up. The self-holding solenoid 30 has a built-in permanent magnet and holds the slide plate 25 in a stopped state with no current flowing in the retracted position or the advanced position.

Here, when the floating magnetic head 5 is in the lowered state and the clamp and slide plate 25 are in the retracted state, the spring 33 is compressed. When the slide plate 25 is advanced along the lower surface of the suspension 8 from this state, the self-holding solenoid 3
When a pulse current is applied to zero, the magnetic force of the permanent magnet that was attracting the movable iron core 32 is canceled out, and the restoring force of the spring 33 pushes the slide plate 25 forward and lifts the suspension 8.

On the other hand, when lowering the floating magnetic head 5 from the riff 1 state, when a pulse current is applied in the opposite direction to the above, the movable iron core 32 is attracted against the compressive force of the spring 33, and accordingly, When the slide plate 25 is pulled back, the floating magnetic head 5 is lowered.

An example of specific sizes of the floating magnetic head 5, suspension 8, and support member 10 will be shown below.

3 to 6, the slider 6 in the floating magnetic head 5 has a diameter of 5 mm in the radial direction of the magneto-optical disk 1;
The size is 7 mm in the circumferential direction.

The suspension 8 is made of stainless steel with a thickness of about 70 μm, and its width becomes gradually narrower as it approaches the floating magnetic head 5. The metal plate 16 is made of aluminum or the like, and its size is 6 mm in the radial direction of the magneto-optical disk 1.
mm, the circumferential direction is 10.2 mm, and the thickness is approximately 0.50 mm.

The length ffi of the suspension 8 between the centers of the slider 6 and the metal plate 16 is 26.41 mm, and the length of the bending region 13 is approximately 3 to 5 mm. The inclination angle θ1 of the suspension 8 with respect to the horizontal plane when in contact with the upper surface of the magneto-optical disk 1 is 2.2°, and the metal plate 16
The distance d1 between the top surface and the top surface of the magneto-optical disk 1 is 2
．． It is said to be 54mm.

Furthermore, when ejecting the magneto-optical disk 1, the suspension 8
is displaced downward to a position where the distance d2 between the upper surface of the metal plate 16 and the lower end of the floating magnetic head 5 is about 5 mm, as shown by the imaginary line in FIG. Here, magneto-optical disk 1
The thickness of the magneto-optical disk is 1.2 mm when loaded.
Assuming that the distance between the bottom surface of and the objective lens 3 is 1 mm,
If the upper horizontal portion of the support member 10 is not extended to the non-flexible region 12 of the suspension 8 as in this embodiment, the floating magnetic head 5 will come into contact with the objective lens 3 when the magneto-optical disk 1 is ejected. In this embodiment, as described above, the inclined surface 14 contacts the suspension 8 before the floating magnetic head 5 contacts the objective lens 3.

As shown in FIG. 10, the step d of the first step portion 21.

is 0.40 mm (therefore, the thickness of the slide plate 25 is 0.40 mm).
40 mm), the inclination angle θ2 of the inclined surface 14 with respect to the horizontal plane is 2.5°, and the distance d4 between the suspension 8 and the inclined surface 14 when the floating magnetic head 5 is in contact with the upper surface of the magneto-optical disk 1. (See Figure 13) is approximately 0.2mm
It is said that

It is preferable that this distance d4 be as small as possible within a range where the suspension 8 of the magneto-optical disk 1 does not come into contact with the inclined surface 14.

The distance ds (FIG. 8) between the lower surface of the lower horizontal portion of the support member 10 and the upper surface of the first step portion 21 is 7.76 mm, the thickness d6 of the lower horizontal portion is 1.5 mm, and the thickness d6 of the lower horizontal portion of the support member 10 is 1.5 mm. The width W of the lower horizontal part is 12 mm, and the width W2 of the upper horizontal part is 10.
5 mm, the width w3 of the groove 23 is 3.5 mm, the length 12 of the first step 21 is 5.8 mm, and the horizontal length of the inclined surface 14 is 7
! 3 is 1. It is assumed to be 0mm.

Note that the sizes listed above are merely examples and can be changed as necessary.

In the above embodiment, the floating magnetic head 5 is configured to be driven together with the optical head 4, but the floating magnetic head 5 may be driven separately from the optical head 4.

Further, in the above embodiment, a lifting device for a floating magnetic head 5 in a magneto-optical disk device has been described, but the present invention can also be applied to a flying head lifting device for a magnetic disk device or the like.

〔Effect of the invention〕

As described above, the floating head lifting device according to the present invention has the following features:
A slide plate is provided that can move forward and backward along the surface of the suspension that supports the floating head on the side facing the recording medium, and the slide plate is slidably arranged in a groove formed in the support member. It is the composition.

As a result, when lifting the suspension, the slide plate is advanced along the surface of the suspension on the side facing the recording medium, and the suspension is lifted to a height where it is almost parallel to the slide plate, and the floating head is Since a predetermined distance is provided between the floating head and the recording medium, the amount of lift of the floating head can be easily made almost constant. Note that the lift amount of the floating head can be adjusted to a desired value by changing the thickness of the slide plate.

In addition, one end of the suspension is directly attached to the support member so that only the suspension and floating head can be raised and lowered, so the conventional swinging member is no longer necessary, reducing the number of parts and making the device thinner. It also has the effect of being able to.

[Brief explanation of drawings]

1 to 15 show an embodiment of the present invention. FIG. 1 is a partially cutaway perspective view of a floating magnetic head lifting device. FIG. 2(a) is a schematic sectional view taken along the line ■-■ in FIG. 1. FIG. 2B is a schematic cross-sectional view showing the floating state of the floating magnetic head. FIG. 3 is a plan view of the floating magnetic head. FIG. 4 is a side view of the same. FIG. 5 is a bottom view of the same. FIG. 6 is a front view taken along the line ■-■ in FIG. 3. FIG. 7 is a plan view of the support member. FIG. 8 is a side view of the same. FIG. 9 is a rear view taken along line IX-IX in FIG. 7. FIG. 10 is a partially enlarged sectional view of FIG. 8. FIG. 11 is a plan view showing the support member and the floating magnetic head. FIG. 12 is a side view of the same. FIG. 13 is a partially enlarged sectional view of FIG. 12. FIGS. 14(a) to 14(e) are schematic side views showing the processing procedure from loading the magneto-optical disk to starting recording, respectively. FIG. 15 is a plan view showing a modification of the sliding plate advancing/retracting mechanism. 5 is a floating magnetic head (floating head), 8 is a suspension, 10 is a support member, 23 is a groove, and 25 is a slide plate. Patent Applicant: Sharp Co., Ltd., Figure 10

Claims (1)

[Scope of Claims] 1. An information recording/reproducing device is provided in which a floating head attached to the other end of a suspension whose one end is fixed to a support member is biased toward a recording medium by the biasing force of the suspension. The floating head elevating device includes a slide plate that can move forward and backward along the surface of the suspension facing the recording medium, and the slide plate is slidably disposed in a groove formed in the support member. A floating head lifting device characterized by: