JP2664447B2 - Rotating disk storage device - Google Patents

Description

The present invention relates to a contact-start-stop type rotating disk storage device (for example, a magnetic disk storage device), in particular, a disk and a transducer are mounted. The present invention relates to an improvement suitable for preventing suction of a slider and releasing suction.

2. Description of the Related Art In a contact start / stop type magnetic disk storage device, when a magnetic disk is stopped, a slider of a magnetic head is in contact with the magnetic disk. Easily causes an adsorption phenomenon due to the surface tension and viscosity of the material. When starting in this state, an excessive force acts on the magnetic head or the magnetic disk, which may cause damage.

For this reason, in the conventional apparatus, as described in Japanese Patent Application Laid-Open No. 62-47890, a nozzle for drying the contact surface by blowing dry air around the contact between the magnetic head and the magnetic disk is provided. There has been proposed an apparatus which reduces a frictional force between a head and a disk to prevent a head-disk suction accident.

In addition, the Invention Association Published Technical Report No. 88-9139 (issued August 1988
10), the recording / reproducing winding of the magnetic head is made of a resistor, or the bulk type magnetic head C
Wrap a resistor around the core in the same way as the recording / playback winding,
A technique has been proposed in which a direct current is applied to these resistors to raise the temperature near the contact portion between the head and the disk, thereby preventing a sticking accident.

Further, as described in JP-A-63-94480, by passing a current between the magnetic disk and the magnetic head slider, a contact resistance of a contact portion between the magnetic disk and the magnetic head is used. A device has been proposed which raises the temperature of the contact portion to prevent an adsorption accident.

[Problems to be Solved by the Invention] However, in the prior art as described in Japanese Patent Application Laid-Open No. Sho 62-47890, it is possible to blow dry air from a nozzle over the entire contact surface between a magnetic head and a magnetic disk. Can not. In other words, since the magnetic head and the magnetic disk are attracted to each other, the space formed by contact between the magnetic head and the magnetic disk is very narrow, so that dry air cannot be sufficiently introduced into this space. For this reason, it is difficult to sufficiently reduce the humidity near the contact surface. In particular, the humidity of the sealed space formed by the contact between the magnetic head and the magnetic disk cannot be reduced. For this reason, there is a problem that the suction between the magnetic head and the magnetic disk cannot be completely released. In addition, dust contained in the dry air blown out from the nozzles adheres to the magnetic head and the magnetic disk, and may cause a malfunction of reading data written on the magnetic disk or writing data to the magnetic disk. Problem. Further, a space for installing the nozzle is required, which is an obstacle to downsizing the disk storage device.

Further, in the related art as described in the above-mentioned Invention Association's published technical report No. 80-9139, when a recording / reproduction winding of a magnetic head is used as a resistor and a direct current is passed through the same, a magnetic field generated from the magnetic head causes There is a problem that magnetic recording information written on the magnetic disk surface is destroyed. Furthermore, since the recording / reproduction winding of the magnetic head is provided at a place different from the contact surface between the magnetic head and the magnetic disk,
There is a problem that the contact surface cannot be efficiently and quickly heated. In the case where a resistor is wound around the C core portion of the bulk type magnetic head in the same manner as the recording / reproducing winding and a direct current is supplied to the resistor, there are the same problems as the above two problems.

Further, in the technique described in the above-mentioned Japanese Patent Application Laid-Open No. 63-94480, since a current flows through the magnetic disk, there is a problem that the magnetically recorded information recorded on the magnetic disk surface is destroyed by the current. Further, in the case where the magnetic disk is made by hardening magnetic powder with epoxy resin, since the magnetic disk is an insulator, a current flows between the magnetic disk and the magnetic head slider through the magnetic disk. Therefore, there is a problem that the contact portion between the magnetic disk and the magnetic head slider cannot be heated.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and to realize a contact start / stop type rotation capable of effectively canceling or preventing the adsorption phenomenon between a recording disk and a slider having a transducer mounted thereon. An object of the present invention is to provide a disk storage device.

[Means for Solving the Problems] The present invention provides a configuration described in each claim for solving the above problems.

In the configuration according to any one of the first to fourth aspects, before the rotation of the recording disk is started, the slider itself generates heat due to the internal resistance of the slider caused by a heating current flowing through the slider via the conductive means. In the configuration described, water droplets on the contact surface between the recording disk and the slider are vaporized and removed by heating the slider with heating light, and the surface tension and viscosity of the lubricant for protecting the recording disk are reduced. The recording disk and the head are no longer attracted,
Adsorption accidents are prevented.

[Embodiment] An embodiment of the present invention will be described in the case of a sealed magnetic disk drive. This magnetic disk drive has a structure in which a plurality of magnetic disks are stacked on a vertical axis and a transducer of a magnetic head moves in a radial direction on a magnetic disk surface, and is of a contact start / stop type. It is. FIG. 5 is a plan view of the disk drive, in which a plurality of magnetic disks 2 as disks are mounted on a rotating shaft 1, a transducer 4 of a magnetic head is mounted on a slider 3 as mounting means, and a support member 5 It is connected to the holding member 6. The holding member 6 is driven to rotate around the rotation shaft 7 to bring the transducer 4 to a predetermined radial position on the magnetic disk 2. This holding member 6
It is driven to rotate about the rotating shaft 7 by a driving means 12 comprising a coil 10 and a magnet 11. These are entirely surrounded by the sealing means 13.

FIG. 1 is an enlarged view of part A of FIG. 5, and FIG. 2 is a sectional view taken along line II of FIG. As shown in the drawing, the transducer 4 is mounted on a slider 3 as mounting means, and the slider 3 is supported by a support member 5. Further, one end of each of the pair of conductive means 21 is connected to two places of the slider 3 by a conductive adhesive 22 or the like. The conductive means 21 is for supplying a current for heating to the slider 3. In the present embodiment, the conductive means 21 is composed of a conductive metal, for example, a copper wire 23 and an insulating coating 24 around the copper wire 23. 2, one end of the copper wire 23 is connected to the slider 3 by a conductive adhesive 22, and the other end is connected to the voltage control means 20 shown in FIG.

In the present embodiment, the slider 3 is made of a conductive ceramic having an electric resistance.
It is made of a material containing Mn and Zn or alumina titanium carbide. The support member 5 and the holding member 6 are made of metal.

FIG. 3 is a side view as seen from the direction B in FIG. Copper wire 23 of conductive means 21
Is adhered to the slider 3 by a conductive adhesive 22,
Since the copper wire 23 other than the vicinity of the bonding portion is insulated by the insulating coating 24, even if the copper wire 23 is energized, no leakage occurs to the support member 5 or the like. FIG. 4 is a side view as viewed from the direction C in FIG. 1 and also a side view in FIG. Slider 3 is tapered
The slider 3 has a pair of floating rails 34 composed of 32 and a flat portion 33, and the transducer 4 is mounted on an end 35 of the slider 3. The conductive means 21 is attached to a plane portion of the flying rail 34 of the slider 3 opposite to the flat portion 33. One end of the copper wire 23 of the conductive means 21 is connected to the slider 3 by the conductive adhesive 22.
The other end is connected to the voltage control means 20 shown in FIG. 5 after passing through the support member 5 and the holding member 6 while being protected by the insulating film 24. It goes without saying that the conductive means 21 and the voltage control means 20 also exist in the space surrounded by the sealing means 13.

Next, the operation of the present embodiment will be described. FIG. 6 is an enlarged view of the slider 3. In this embodiment, the magnetic disk 2
When the magnetic disk is stopped, the slider 3 comes into contact with the magnetic disk 2. When the magnetic disk rotates, the slider 3 floats above the magnetic disk 2 by utilizing the principle of a dynamic pressure air bearing. A so-called contact start / stop method is adopted. For this purpose, as shown in FIG.
At the time of stop, the flat portion 33 of the flying rail 34 of the slider 3, which is the mounting means of the transducer, comes into contact with the magnetic disk 2. The surface of the magnetic disk 2 is not a completely flat plane as shown in FIG. 6 due to deformation due to surface processing and unevenness of dust containing magnetic powder (this is exaggerated in the figure). Therefore, the flat part 33 of the flying rail 34
A minute space is formed at a contact portion between the magnetic disk 2 and the surface of the magnetic disk 2. Water droplets 40 are formed in the minute space by condensation of water vapor contained in the air, and a so-called adsorption phenomenon in which the magnetic disk 2 and the slider 3 are adsorbed by the surface tension and viscosity of the water droplets may occur. If the magnetic disk 2 and the slider 3 are attracted to each other, the magnetic disk 2 does not rotate at the start of rotation of the magnetic disk, or the slider 3
May move together with the magnetic disk 2 and apply excessive force, and the magnetic head may be damaged or an accident may occur.
The reliability of the magnetic disk drive is significantly reduced. In order to prevent this adsorption phenomenon from occurring, it is necessary to remove water droplets generated in a minute space created by the contact between the flat portion 33 of the rail 34 of the slider 3 and the magnetic disk 2. For this reason, in this embodiment, before starting the disk rotation at the time of starting the magnetic disk device, the voltage control unit 20 uses the conductive unit 21 to perform the following operations.
A voltage V is applied to the slider 3 to cause a current to flow through the slider 3.

Assuming that the electric resistance of the slider 3 is R, the slider generates heat due to the electric resistance of the slider itself when the voltage V is applied. Assuming that the amount of heat generated by the slider is Q and the current flowing when a voltage V is applied to the slider is I, Q is represented by the following equation: Q = V · I (1) = V ² / R (2 When the slide 3 is energized in this manner, the heat generated by the internal resistance R of the slider 3 causes the water droplets 40 generated on the entire contact surface between the slider 3 and the magnetic disk 2 to heat the entire slider 3. Are all heated and vaporized.
For this reason, it is possible to prevent the occurrence of an adsorption accident due to water droplets.

In the present embodiment, since the entire slider is heated by electricity using the internal resistance of the slider 3, it is easy to control the heating amount of the slider and no special device is required. Further, since all the contact surfaces between the slider 3 and the magnetic disk 2 can be heated, water droplets generated in all the minute spaces formed by the contact between the slider 3 and the magnetic disk 2 are easily heated and vaporized. be able to. In addition, it can be expected that the slider itself is deformed by heating the slider, and the attraction force is removed.

The heating current flowing through the slider may be DC or AC. When the electric resistance R of the slider is non-linear with respect to the temperature, the heating value Q of the slider can be easily controlled by using the current control means instead of the voltage control means 20.

Note that the pair of terminals 22 and 22 of the conductive means 21 are
The slider 3 is provided near both ends in the axial direction of the slider 3 so that the entire flat portion 33 of the flying rail 34 is heated.

As described above, by providing both terminals of the pair of conductive means 21 on the slider, a current flows only inside the slider, so that the rider itself is heated by heat generated by the internal resistance of the slider. Has become.

Further, in this embodiment, by heating the slider, it is possible to increase the temperature of the lubricant applied on the surface of the magnetic disk for protecting the magnetic disk, thereby reducing the surface tension and viscosity of the lubricant. Becomes For this reason, it is possible to prevent sticking accidents caused by the lubricant entering the contact surface between the magnetic disk and the slider.

A second embodiment of the present invention is shown in FIG. 7 and FIG. 8, which is a cross section taken along the line II. Instead of using the two conductive means 21 and 21 as in the first embodiment described above, in this embodiment, a copper wire 23 with an insulating coating 24 is used as one conductive means 21,
The supporting member 5 and the holding member 6 made of a conductive material are used as the other conductive means. Other configurations are the same as those of the first embodiment. In the present embodiment, the conductive means for the slider heating current can be simplified, and the same effect as in the first embodiment can be expected.

FIGS. 9 and 10 show a third embodiment of the present invention. In this embodiment, a conductive member 50 is provided on the upper surface of the flying rail 34 of the slider 3 opposite to the flat portion 33. The conductive member 50 is an electric resistor, and is attached to the slider 3 with an adhesive or the like. Further, a pair of conductive means 21 similar to the first embodiment is connected to two points of the conductive member 50. For this reason, even if the material of the slider 3 is a material having high electrical insulation (for example, alumina), the conductive member
Since power is supplied to the conductive member 50 and the conductive member 50 can be used as a heating element, the same effect as that of the first embodiment of the present invention can be expected. The location of the conductive member 50 connected to the conductive means 21 on the slider is not limited to the upper surface of the slider, but may be any location suitable for heating the flat portion 33 of the rail 34.

FIG. 11 shows a fourth embodiment of the present invention. The same reference numerals as those in the first embodiment indicate the same or similar ones.
In this embodiment, an optical heating means 60 for irradiating the slider 3 as a transducer mounting means with light 62 to heat it.
The irradiation light control means 70 for controlling the irradiation light 62 is provided on the holding member 6. The irradiation light control means 70 irradiates the slider 3 with light 62 from the optical heating means 60 at the start of rotation of the disk 2 to heat the slider 3 with light energy. By heating the slider 3 by the optical heating means 60, the same effect as in the first embodiment can be expected. As the optical heating means 60, for example, He-Ne laser light 61
Use As the optical heating means 60, far infrared rays or the like may be used. In this case, a ceramic member or the like that efficiently converts the radiated far infrared rays or the like into heat may be provided on the slider.

In the embodiment shown in FIG. 11, it is not necessary to mount the conductive means 21 used in the first embodiment on the slider 31. For this reason, the disk follow-up characteristic (flying characteristic) of the slider 3 during rotation of the disk 2 is not affected by the installation of the conductive means 21, and it is possible to secure a good floating characteristic. Further, since the optical heating means is used, the slider can be heated by the same mechanism regardless of whether the material of the slider is insulating or conductive.

A fifth embodiment of the present invention is shown in FIGS. In this embodiment, the slider 3 is composed of two support members made of a conductive material.
5a, 5b, the supporting members 5a, 5b
36, it is fastened to the holding member 6 made of an insulating material. Further, the supporting members 5a and 5b are connected to the voltage control means 20 by two conducting wires 23a and 23b. In this embodiment, a DC voltage source 25 is used as the voltage control means 20. Therefore 2
The conductors 23a and 23b are a positive electrode terminal (+) and a negative electrode terminal (-), respectively. Since the support members 5a and 5b of the slider of this embodiment are made of a conductive material, the support members 5a and 5b support the slider 3 and also have a function of a conductive means for supplying a heating current to the slider 3. For this reason, the same effect as in the first embodiment can be expected without installing the conductive means on the slider 3. This makes it easier to manufacture the device.

A conductive member as an electric resistance heating element is provided on the slider.
Also in the third embodiment in which 50 is attached, as the conductive means for supplying a heating current thereto, the first and second conductive means are used.
The one according to the second or fifth embodiment may be adopted.

[Effects of the Invention] According to the present invention, in a rotating disk storage device, water droplets generated in a minute space or a contact surface formed by contact between a storage disk and a slider as a mounting means of a transducer are heated and vaporized. It is possible not only to prevent the recording disc and the head from being adsorbed by water droplets, but also to heat the lubricant applied to the surface of the disc to protect the recording disc,
Since the surface tension and the viscosity can be reduced, it is possible to prevent an adsorption accident caused by sticking of the lubricant. Further, by heating the slider, the effect of preventing the sticking accident due to the deformation of the slider can be expected. Moreover, according to the present invention, there is no dust attached to the recording disk or the head as in the case where air is blown from a nozzle, the current for heating does not destroy the information stored on the recording disk, There are also effects such as that the contact surface between the plate and the head can be heated quickly and effectively, and that the present invention can be applied even when the recording disk is non-conductive.

[Brief description of the drawings]

FIG. 1 is a plan view of a magnetic head according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line II of FIG. 1, FIG. 3 is a side view of FIG. FIG. 4 is a side view seen from the direction C in FIG. 2, FIG. 5 is a plan view of a magnetic disk drive according to the embodiment of the present invention, FIG. 6 is a functional explanatory view of the first embodiment, FIG. FIG. 8 is a plan view of a magnetic head according to a second embodiment of the present invention, FIG. 8 is a sectional view taken along the line II of FIG. 7, and FIG. 9 is a front view of a slider unit according to a third embodiment of the present invention. Fig. 10, Fig. 10
FIG. 11 is a main configuration diagram of a fourth embodiment of the present invention, and FIGS. 12 and 13 are a plan view and a side view of a magnetic head according to a fifth embodiment of the present invention. . DESCRIPTION OF SYMBOLS 1 ... Rotating shaft, 2 ... Magnetic disk 3 ... Slider 4, ... Transducer 5 ... Support member, 6 ... Holding member 12 ... Driving means, 13 ... Sealing means 20 ... Voltage control means, 21 … Conducting means 34… Floating rail, 33… Flat part 40… Water droplet 50… Conductive member 60… Optical heating means 70… Irradiation light control means

Claims (6)

(57) [Claims] 1. A contact start device comprising: a recording disk mounted on a rotating shaft; a slider mounted with a transducer for the recording disk; and a support for movably supporting the slider with respect to the recording disk. In a stop-type rotating disk storage device, conductive means having current input / output terminals respectively connected to the slider at spaced portions on the slider, and heat generation of the slider itself due to the internal electric resistance of the slider is generated. A rotating disk type storage device, further comprising heating current supply means for flowing a heating current into the slider from the current input / output terminal via the conductive means before the recording disk starts rotating. 2. A contact start device comprising: a recording disk mounted on a rotating shaft; a slider mounted with a transducer for the recording disk; and a support for movably supporting the slider with respect to the recording disk. In a stop-type rotating disk storage device, a conductive member as an electric resistor attached to a slider, and a current input / output connected to the conductive member at spaced portions on the conductive member, respectively. A conductive means having an end, and a heating current for generating heat of the conductive member due to an internal electric resistance of the conductive member, the current input / output terminal through the conductive means before the start of rotation of the recording disk. A rotating disk type storage device, further comprising a heating current supply means for flowing the conductive member inside the conductive member. 3. A rotating disk storage device according to claim 1, wherein said conductive means comprises a pair of conducting wires. 4. The rotating disk storage device according to claim 1, wherein said conductive means comprises a conductor and a conductor which also serves as said support for supporting a slider. 5. The conductive means comprises a pair of conductors which also serves as the support for supporting a slider.
A rotating disk type storage device as described in the above. 6. A contact start device comprising a storage disk mounted on a rotating shaft, a slider mounted with a transducer for the storage disk, and a support movably supporting the slider with respect to the recording disk. In a stop-type rotating disk storage device, an optical heating unit for irradiating a slider with heating light to heat the slider, and operating the optical heating unit before the recording disk starts rotating. A rotating disk type storage device provided with irradiation light control means for the storage device.