JPH03230321A - Adhesion measuring instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to adhesion measurement technology, and is particularly effective when applied to evaluation of magnetic disks by measuring adhesion between the magnetic disk surface and a magnetic head. related to technology.

[Conventional technology]

For example, in magnetic disk drives widely used as external storage devices in information processing equipment, the so-called contact start-stop (C3S) method is used to improve the recording density of information on the magnetic disk, which is the recording medium. It is being

In other words, in principle, the narrower the flying gap of a magnetic head that performs information recording/reproducing operations on a magnetic disk using magnetism as a medium, the greater the information recording density on the magnetic disk. The floating gap is narrowed by increasing the pressing force balanced with the lifting force, so that when the magnetic disk is stationary, the magnetic head is in close contact with the surface of the magnetic disk.

In such a C3S method, the magnetic disk and the magnetic head are in a sliding state for a certain period from the start of the magnetic disk to steady rotation, and from steady rotation to rest, and there is concern about wear and tear on the magnetic disk. .

For this reason, lubricant is applied to the surface of the magnetic disk in order to reduce frictional resistance and protect the magnetic disk. However, if the amount of lubricant applied is too much or too little, the magnetic Problems can occur such as the head becoming stuck to the magnetic disk, making it difficult to start up, or insufficient protection of the magnetic disk, so it is necessary to accurately evaluate the state of lubricant application to the magnetic disk. .

Conventionally, as this type of technology, for example, Japanese Patent Application Laid-Open No. 1986-
A technique disclosed in Japanese Patent No. 3437 is known.

In other words, a magnetic disk coated with lubricant is fixed to a spindle, a head slider is placed facing a predetermined position on one side of the magnetic disk, and the magnetic disk is brought into close contact with a load several times the normal load pressure using a weight or the like. After leaving it for a predetermined period of time, remove the excess load to bring it to the normal load pressure, then pull the string wound around the spindle tangentially using a tension gauge, etc., to measure the force required to start the rotation of the magnetic disk. By measuring this, the maximum adhesion force (saturated adhesion force) between the magnetic disk and the magnetic head (head slider) in an unused state is measured, and the state of application of lubricant on the magnetic disk is evaluated.

[Problem to be solved by the invention]

However, in the case of the above-mentioned conventional technology, what is obtained by measuring - times is the attraction force only for a specific part (radial position) on one side of the magnetic disk, and it is not possible to measure the entire area on both the front and back sides of the magnetic disk. When attempting to do so, it is necessary to frequently repeat the operations of moving the magnetic head to the desired position, applying torque to the magnetic disk, and even reversing the magnetic disk.
There are problems such as the measurement work becomes complicated and the time required increases.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an adhesive force measurement technique that can quickly and efficiently measure the adhesive force on both the front and back surfaces of a disc.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means to solve the problem]

Among the inventions disclosed in this application, a brief overview of typical inventions is as described by Shimokita.

That is, the adhesive force measuring device according to the present invention includes a mounting base that removably holds and rotates a disc, a plurality of probes that are movably supported, and a mounting base that supports both the front and back sides of the disc held on the mounting base. A support means for pressing each of the probes with a desired load, and a force acting on each of the pressers pressed against the disk when the disk is rotated is individually measured via the support means. A measuring means, a conveying means that carries the supporting means and the measuring means and moves it in the radial direction of the disc held on the mounting base, and a display means that visually displays the measurement results by the measuring means are provided. is pressed against the disk with a desired load, and by moving the conveying means in the radial direction of the disk while rotating the disk, the force acting on each measuring element from the rotating disk is reduced. It is designed to measure both the front and back sides of the disc simultaneously in a spiral pattern.

[Effect]

According to the above-described adhesive force measuring device of the present invention, for example, a force generated by the adhesive force between the measuring tip and the disk is applied to the measuring tip which is pressed with a desired load on both the front and back surfaces of a rotating disk. is detected as a rotational moment by the support mechanism, and based on this rotational moment, the measuring means detects the force acting on each probe and outputs it as an adhesive force to the display means. ,
By moving the conveying means carrying the entire measuring head and measuring means in one direction in the radial direction of the disc, and changing the abutment position of each measuring head on both the front and back surfaces of the disc in the radial direction, Adhesive strength can be measured simultaneously over the entire area on both the front and back sides.

As a result, it is possible to quickly and efficiently measure the adhesion force over almost the entire area on both the front and back surfaces of the disc, compared to the case where, for example, the measuring element is pressed against each specific part on one side of the disc and measured sequentially. becomes possible.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An adhesive force measuring device according to an embodiment of the present invention will be described in detail below with reference to the following aspects.

FIG. 1 is a side view schematically showing an example of the configuration of an adhesive force measuring device according to an embodiment of the present invention, and FIG. 2 is a plan view showing a part thereof.

The adhesive force measuring device of this embodiment includes a mounting base 2 that holds a disk 1 such as a magnetic disk whose surface is coated with lubricant, and a drive motor 3 that rotates this mounting base 2 at a desired speed. The disc 1 is detachably fixed to the mount 2 via a cap 2a that is screwed onto the mount 2.

Near the mounting base 2, there is a disc 1 held on the mounting base 2.
A pair of guide rails 4 are arranged parallel to each other in the radial direction, and a carriage 5 is movably mounted on the guide rails 4.

A feed screw 7 that is rotated in a desired direction by a drive motor 6 supported on the guide rail 4 side is screwed into the carriage 5, and drives the rotation direction and rotation speed of the feed screw 7. By appropriately controlling the motor 6, the carriage 5 is configured to move linearly along the guide rail 4 in the radial direction of the disk I in a desired direction at a desired speed.

The drive motor 3 that rotates the mount 2 and the drive motor 6 that rotates the carriage 5 are controlled by a common control unit 8, and the rotation speed of the mount 2 and the linear movement speed of the carriage 5 are controlled by a common control unit 8. etc. can be set in any desired combination.

The carriage 5 is rotatably supported by a pivot shaft 9 provided parallel to the rotation axis of the mounting base 2, and has a plurality of support mechanisms 10 and supports so as to sandwich the disc 1 held on the mounting base 2. A mechanism 11 is arranged and is able to swing freely within a plane parallel to the disk 1.

At the ends of the support mechanisms 10 and 11 on the side of the mounting base 2, a magnetic head, which is attached to a magnetic disk device together with a disk 1 such as a magnetic disk, etc., is attached via a plate spring 10a and a plate spring lla. A plurality of probes 1 consisting of
2 and the probe 13 are fixed, and the plate spring 10
The structure is such that the individual probes 12 and 13 are pressed against both the front and back surfaces of the disc 1 with a desired load by the biasing forces of a and 11a.

On the other hand, on the other end side of the support mechanisms 10 and 11 in the carriage 5, a strain-to-electrical signal converter 141 and a strain-to-electrical signal converter 142 comprising, for example, a load cell are provided.
Detector 14 consisting of detection rods 141a and 142a that transmits the displacement of the Pa section of each of the support mechanisms 10 and 11 to the child electric signal converters 141 and 142, respectively.
is located.

In the support mechanism 10 (11), the distance from the pivot shaft 9 to the contact point of the detection rod 141a (142, a) is set to be equal to the distance to the contact point 12 (13).

Then, when the disc l rotates in the direction of the arrow, the contact point 12 (13) in the direction of the arrow B, which is generated due to the adhesive force between the disc 1 and the contact point 12 (13),
For example, a displacement of about 0 to 0.03 mm is considered an equal displacement in the direction of arrow C in the strain-electrical signal converter 141 (14
2), and is transmitted to the digital indicator 15 and the display 1 as an electric signal corresponding to the amount of displacement (amount of distortion).
7. Microcomputer 1 equipped with printer 18 etc.
6 is output.

Then, an electric signal corresponding to the load at that point measured by the detector 14 is sequentially displayed visually to the operator via the digital indicator 15 as a corresponding load value in the range of 0 to 50 gf, for example. The microcomputer 16 aggregates and displays the load measurement results over the entire area of the disk l measured as described below.
Processing such as recording is now performed.

Hereinafter, an example of the operation of the adhesive force measuring device of this embodiment will be explained.

First, prior to actual measurement work, the values displayed on the detector 14 and the digital indicator 15 are checked and adjusted using an actual load calibration method.

That is, the strain-electrical signal converter 1 constituting the detector 14
41 and 142 detection rods 141a and 142a
Add a no load and a known actual load to each of them using a tensile/con gauge, etc., and calculate the relationship between the actual load and the value displayed on the digital indicator 15 at that time as a line 8 as shown in FIG. 3, for example. Record yourself.

Then, for example, by using the zero point adjustment function of the digital indicator 15, etc., adjustment is made as appropriate so that the indicated value and the actual measured value match.

Thereafter, first, a disk 1 such as a magnetic disk to be measured is placed on the mount 2 and fixed with a cap 2a.

Next, by moving the carriage 5 appropriately, the first
As shown in the figures, the probes 12 and 13 are brought into contact with the innermost periphery of both the front and back surfaces of the disk 1 with a desired load.

Thereafter, by driving the mounting base 2 to rotate the disc 1 in the direction of the arrow A, and moving the carrier gauge 5 linearly in the direction of the arrow at a desired speed, the contact points 12 and 1 are
3 draws a spiral trajectory with respect to the disk 1 and moves over the entire area from the innermost circumference to the outermost circumference of the disk 1.

At this time, the digital indicator 15 receives a load ( At the same time that the adhesive force is displayed, the microcomputer 16 records the positions of the probes 12 and 13 in the radial direction of the disc 1 and the measured load (adhesive force) at the positions.

After the measurement is completed, the measurement results regarding the entire area on both the front and back surfaces of the disc 1 are displayed on the display 17 as diagrams such as those shown in FIGS. 4(a), (b) and 5(a), (b). At the same time, the information is displayed on a desired recording paper by the printer 18 along with the identification information of the disc 1 and the like.

Diagrams showing examples of such measurement results are shown in FIGS. 4 and 5.

That is, FIGS. 4(a) and b) show the measurement results of the front side and back side of a normal disk 1,
This shows that the adhesive force on both the front and back surfaces is stable at approximately a predetermined value over the entire area.

On the other hand, FIGS. 5(a) and 5(b) show the measurement results in the case of the two-disk plate 1 having an abnormal adhesive force.

That is, in the disc 1 obtained from the measurement results, the adhesive force in the central part of the front side of the figure (a) shows an abnormally large value, and in this region, for example, 'iF! This indicates that there is a problem with the amount of lubricant applied, such as too much or too little.

If there is a large dispersion in the adhesion of the disc I such as a magnetic disk, that is, if there is an excess or deficiency in the amount of lubricant applied, the magnetic disk and magnetic head may This causes difficulty in starting up due to sticking to the magnetic disk and accelerates wear of the magnetic disk and magnetic head, leading to breakdowns and reduced reliability in magnetic disk devices equipped with the magnetic disk as a storage medium.

Therefore, if such an abnormality is found, for example, immediately stop the application of lubricant to the disk 1 such as a magnetic disk in the same manufacturing process, and prevent the occurrence of many magnetic disks with abnormal adhesive strength. In addition to reviewing the entire process and taking appropriate measures to address the causes of abnormal adhesive strength, we aim to stabilize the quality and improve the reliability of disks such as magnetic disks.

As described above, according to the adhesive force measuring device of this embodiment, it is possible to simultaneously measure the adhesive force in the entire area of both the front and back sides of each disc 1 in one measurement operation. Also, complicated operations such as sequentially moving the position of the disc 1 in the radial direction of 13 and reversing the disc 1 are completely unnecessary, and adhesive force measurement can be carried out efficiently and quickly.

Furthermore, since the adhesive strength is continuously measured over the entire area on both the front and back sides of each disc 1, it is possible to
This eliminates the possibility of overlooking areas with abnormal adhesive strength due to removal of measurement areas, etc., and improves the reliability of adhesive strength measurement work.

For example, according to actual measurements by the present inventors, one disk light,
It is known that while the conventional method requires several tens of minutes, the adhesive force measuring device of this embodiment only takes a few minutes, which is a significant reduction in the required time.

As a result, measurement results such as abnormalities in adhesive strength can be quickly reflected in reviews of manufacturing processes, etc., and productivity in the entire manufacturing process of disks such as magnetic disks is improved.

Although the invention made by the present inventor has been specifically explained above based on Examples, it goes without saying that the present invention is not limited to the Examples and can be modified in various ways without departing from the gist thereof. Nor.

〔Effect of the invention〕

Among the inventions disclosed in this application, the effects obtained by typical inventions are briefly described below.

That is, the adhesive force measuring device according to the present invention includes a mounting base that removably holds and rotates a disc, a plurality of probes that are movably supported, and a mounting base that supports front and back surfaces of the disc held on the mounting base. Supporting means for pressing each of the measuring elements with a desired load on both sides, and a force acting on each of the pressing elements pressed against the circular plate when the disk is rotated is transmitted through the supporting means. a measuring means for individually measuring the measuring means; a conveying means for mounting the supporting means and the measuring means in a radial direction of the disk held on the mounting base; and a means for visually confirming the measurement results by the measuring means. and a display means for displaying, and is rotated by moving the conveyance means in the radial direction of the disc while rotating the disc while the measuring head is pressed against the disc with a desired load. Since the force acting on each measuring element from the disc is measured simultaneously on both the front and back sides of the disc in a spiral manner, for example, the force acting on each measuring element from the rotating disc is measured by applying the measuring element to the measuring element that is pressed with a desired load on both the front and back sides of the rotating disc. The support mechanism detects the force generated by the adhesive force between the disk and the disc as a rotational moment, and based on this rotational moment, the measuring means detects the force acting on each measuring element and displays the adhesive on the display means. In this state, the conveying means carrying the supporting mechanism, measuring element, and measuring means is moved in one direction in the radial direction of the disk, and each measuring element is brought into contact with both the front and back surfaces of the disk. By changing the position in the radial direction, it is possible to simultaneously measure the adhesive force over the entire area on both the front and back surfaces of the disc.

As a result, it is possible to quickly and efficiently measure the adhesion force over almost the entire area on both the front and back surfaces of the disk, compared to the case where, for example, the measuring element is pressed on each specific area on one side of the disk and measured sequentially. becomes possible.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a side view schematically showing an example of the configuration of an adhesive force measuring device according to an embodiment of the present invention, and FIG. 2 is a plan view showing a part thereof. , FIG. 3 is a diagram showing an example of the operation of the adhesive force measuring device which is an embodiment of the present invention, and FIGS. 4(a) and (b) show the front and back surfaces of a disk with normal adhesive force. Diagram showing an example of measurement results. FIGS. 5(a) and 5(a) are diagrams showing an example of measurement results for both the front and back surfaces of a disc with abnormal adhesive strength. 1...Disk, 2...Mounting base, 2a...Cap,
3... Drive motor, 4... Guide rail, 5... Carriage, 6... Drive motor, 7... Feed screw, 8
...Control unit, 9...Pivot axis, 10.11...
Support mechanism, 10a. 11a...Plate spring, 12.13...Measuring point, 14.
...Detector (measuring means), 141, 142...Strain-electrical signal converter, 141a, 142a...Detection terminal,
15...Digital indicator (display means), 16...
Microcomputer (measuring means), 17... Display (display means), 18... Printer (display means).

Claims (1)

[Claims] 1. A mounting base that removably holds and rotates a disc, and a plurality of probes that are movably supported, and each of the probes is attached to the desired position on both the front and back surfaces of the disc held by the mounting base. a supporting means for pressing each with a load; a measuring means for individually measuring, via the supporting means, a force acting on each of the pressers pressed against the disc when the disc is rotated; It is comprised of a conveying means that mounts a supporting means and the measuring means and moves the disc held on the mounting base in the radial direction, and a display means that visually displays the measurement results by the measuring means, By moving the conveying means in the radial direction of the disk while rotating the disk while pressing the probe against the disk with a desired load, the rotating disk acts on each measuring tip. An adhesive force measuring device characterized by measuring force simultaneously in a spiral shape on both the front and back sides of the disc.