JPH0366020A - Floppy disk for head alignment - Google Patents

Abstract

PURPOSE:To attain the check and adjustment of head alignment with an alignment signal recorder of one side recording type by fitting a core plate while having a disk in between and providing an upper core to the core plate removably. CONSTITUTION:Core plates 3a, 3b having a disk 1 in between are adhered concentrically to the disk 1 by using double side adhesion tapes 2a, 2b. Moreover, a chucking spring 7 in cooperation with a base 6 is provided to the center of the plates 3a, 3b. Then an upper core 8 is mounted on/dismounted from the plate 3a from the upper side and mounted on/dismounted from the plate 2a from the lower side. The mount is implemented by inserting a fixed pin 10 to holes 5a, 5b and a PG pin 9 to pin holes 4a, 4b respectively. A one side recording type alignment signal recorder is used to record an alignment signal to the floppy disk formed in this way thereby applying this method to the alignment check for a double side recording and reproduction type floppy disk.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a floppy disk for blade alignment, and is useful for blade alignment of a double-sided recording/playback type floppy disk device.

<Prior Art> Floppy disks are widely used as a medium for magnetically recording various types of information such as video, audio, and data.

There are two types of floppy disk devices for recording and reproducing information on and from floppy disks: single-sided recording/reproducing type and double-sided recording/reproducing type. A single-sided recording/playback type floppy disk device has one head and records and plays only on one side of the floppy disk. On the other hand, a double-sided recording/playback type floppy disk device has two heads with a floppy disk in between, and can record and read data on both sides of the floppy disk. Floppy disk drives for 2-inch floppy disks (video floppies) are currently single-sided recording/playback type.

Incidentally, head alignment of floppy disk devices is adjusted at the final stage of the manufacturing process. Head alignment refers to checking whether the azimuth angle of the head is the correct angle, and whether the stopping position of the head along the radial direction matches the normal track position.
This means that when there is a deviation, it is adjusted so that it is in the normal state.

An alignment signal recording device is used when inspecting the suitability of head alignment.

Although the alignment signal recording device has the same structure as the floppy disk device to be inspected, it is manufactured by adjusting the head azimuth angle and head stop position to be in a normal state with high precision. Therefore, after recording alignment signals for several tracks on a floppy disk using an alignment signal recording device, the floppy disk is taken out and played back by the floppy disk device to be tested, and the state of the alignment signal when played back is recorded. It is analyzed using an oscilloscope, etc., and the state of head alignment is determined based on this analysis.

<Problems to be Solved by the Invention> When performing head alignment, conventionally, when the floppy disk device to be inspected is a single-sided recording/playback type, an alignment signal is recorded in one head of the single-sided recording type. If the floppy disk device to be inspected is a double-sided recording/playback type, use a two-head double-sided recording type alignment signal recording device.

However, with a double-sided recording type alignment signal recording device,
Equipped with two heads with a floppy disk in between,
Moreover, it goes without saying that both heads must be set extremely accurately. The setting state of the head of this alignment signal recording device requires a detailed and troublesome work of adjusting while observing with an optical microscope or the like, which is extremely difficult in a double-sided recording type having two heads.

Furthermore, recently, a double-sided recording/playback type floppy disk device that can record and play back on both sides of a small 2-inch floppy disk is being researched and developed. If an attempt is made to produce a prototype alignment signal recording device, in addition to the difficulties described above, the difficulties will increase as the diameter becomes smaller.

In view of the above-mentioned prior art, the present invention provides a head alignment system that allows head alignment to be checked and adjusted using a single-sided recording type alignment signal recording device even if the floppy disk device to be inspected is a double-sided recording/playback type. It provides floppy disks for

Means for Solving the Problems> The configuration of the present invention for solving the above problems consists of a magnetic recording medium in the form of an annular plate, and a magnetic material in the form of an annular plate, with the magnetic recording medium interposed therebetween. A pair of core plates of equal thickness are attached concentrically to the magnetic recording medium, and an upper core is shaped like an annular plate and is detachably attached concentrically to either of the pair of core plates. and a magnetic bottle that is fixed to the upper core and becomes a magnetic path that guides magnetic flux from one core plate side to the other core plate side when the upper core is attached to either of the pair of core plates. It is characterized by having.

According to the present invention, an alignment signal is recorded on one side of a floppy disk for head alignment using a single-sided recording type alignment signal recording device, and in the floppy disk device to be inspected, an alignment signal is recorded on one side of a floppy disk for head alignment. After installing the floppy disk of the present invention and sending an alignment signal to one head, the floppy disk can be turned over and 7 alignment adjustments can be made to the other head.

Example of implementation Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 is an exploded perspective view showing a floppy disk 20 for head alignment according to a first embodiment of the present invention. As shown in the figure, a toroidal plate-shaped magnetic recording medium (hereinafter referred to as "
1 has an annular core plate 3a attached to its front side with a ring-shaped double-sided adhesive tape 2a, and an annular core plate 3b attached to its back side with a ring-shaped double-sided adhesive tape 2b. It is pasted. In other words, the core plates 3m and 3b are attached to the disc 1 in a circular manner, sandwiching the disc 1 between them. The core plays 1-3m and 3b have the same thickness and are made of a magnetic material such as magnetic stainless steel (SUS430) or iron-nickel magnetic alloy. Furthermore, a core plate 3a.

3b has pin holes 4a, 4b and a bottle hole 5a.

5b is formed, and the core plate 3b is provided with a receiving portion 6 for the spindle shaft. Of course, the positions of the bottle hole 4a and pin hole 4b and the positions of the bottle hole 5a and bottle hole 5b match.

Disc 1 and core plate 3m, 3 fixed together
A chucking spring 7 is provided at the center of b.

The chucking spring 7 cooperates with the receiver 6 to hold the spindle shaft and lock it in a predetermined position over the rotational direction.

As shown in FIG. 2, the upper core 8 has an annular plate shape, and a magnetic pin (hereinafter referred to as rPG pin) 9 and a fixing pin 10 are fixed to the upper core 8. There is. The PG bottle 9 is made of magnetic stainless steel (SU
The fixing pin 10 is made of non-magnetic stainless steel (SUS30) or iron-nickel magnetic alloy.
4) is made of non-magnetic material such as

In FIG. 1, the upper core 8 can be attached to and removed from the core plate 3a from the upper side, and can be attached to and removed from the core plate 3b from the lower side. When attaching the upper core 8 to the core plates 3a and 3b, the fixing pin 10 is inserted into the bottle holes 5a and 5b, and the
This is done by tightly inserting the G pin 9 into the pin holes 4a and 4b, respectively.

Next, the assembled state (hereinafter referred to as "mode") of the floppy disk 20 for head alignment shown in FIG. 1 will be explained.

3B shows the first mode of this embodiment. In other words,
FIG. 3(a) is a plan view with the disk 1 omitted;
b) is a sectional view, and FIG. 3(e) is a bottom view with the disk 1 omitted. As shown in FIG. 3(a), (b), and (c), in the first mode, the upper core 8 is connected to the core plate 3.
It is attached to b. In this state, the PG bottle 9 is in the bottle hole 4a.

4b, and the fixing pin 10 is inserted into the bottle hole 5m.

It is inserted in 5b.

FIG. 4 shows the second mode of this embodiment. In other words,
FIG. 4(a) is a plan view with the disk 1 omitted, FIG. 4(a)
b) is a sectional view, and FIG. 4(c) is a bottom view with the disk 1 omitted. As shown in FIG. 4 (a), (b), and (c), in the second mode, the upper core 8 is
It is attached to m. In this state, the PG pin 9 is in the bottle hole 4a.

4b, and the fixing bottle 10 is inserted into the bottle hole 5a.

It is inserted in 5b.

Switching between the first mode and the second mode described above can be done extremely easily. For example, from the first mode (Figure 3) to the second
To switch to the mode (Fig. 4), remove the upper core 8 from the core plate 3b, turn the disc 1 over,
You can attach the upper core 8 to the core play (37L). Switching from the second mode to the first mode can also be easily performed in the same way.

Here, a 2N type method for performing head alignment using the floppy disk 20 for head alignment according to the first embodiment will be described with reference to FIGS. 5 and 6.

In FIG. 5, 50 is a single-sided recording type alignment signal recording device, and 100 is a double-sided recording/reproducing type floppy disk device for alignment inspection. The alignment signal recording device 50 has one head 51. Further, a spindle 53 provided with a permanent magnet 52 for chucking is rotated by a motor 54. Furthermore, a PG signal detection section 55 consisting of a yoke and a coil is provided. On the other hand, the floppy disk device 100 has two heads 101a and 101b, and a spindle 103 provided with a permanent magnet 102 for chucking is rotated by a motor 104. Furthermore, a PG signal detection section 105 consisting of a yaw and a coil is provided.

In the method shown in FIG. 5, the floppy disk 20 is first set to the second mode in which the upper core 8 is attached to the core plate 3a, as shown in FIG. It is attached to the recording device 20. Then, the head 51 records the recording surface of the disk 1 on the corebrake)-3b side (hereinafter, this recording surface will be referred to as the "B side", and the recording surface on the opposite side will be referred to as the "A side"). Record the alignment signal. For example, the first part of side B.
Record the alignment signal on the 25th and 50th tracks.

During this recording, the magnetic flux of the permanent magnet 52 passes through the core plate 3b and the PG pin 9 and reaches the PG signal detection section 55, so that synchronization is achieved.

Next, the floppy disk 20 is removed from the alignment signal recording device 50 and inserted into the floppy disk device 100 as shown in FIG. 5tb). In other words, the floppy disk 20 is kept in the second mode and chucked onto the spindle 103, and the B side of the disk 1 is placed in the spatula F.
10 l b lc Set so that they are facing each other. In this state, the floppy disk device 100 is operated for reproduction,
The alignment of the head 101b can be inspected by reproducing the Bi alignment signal using the head 101b and inspecting the reproduced signal.

Next, place the floppy disk 2o on the spindle 103.
5(C), and then chucked onto the spindle 103 again as shown in FIG. 5(C).

In other words, the disk 1 on which the alignment signal is recorded
The B side of the head 101a faces the head 101a.

In this state, the floppy disk device 100 is operated for reproduction, the alignment signal of side B is reproduced by the head 101a, and the head 101a is inspected for reproduction No. 73.
alignment inspection can be performed.

Note that the procedure in FIG. 5 (bl) and the procedure in FIG. 5 (C1) may be reversed.

The second method will be explained based on FIG. In the second method, first, as shown in Figure 6(a), the floppy disk 2o
is placed in the alignment signal recording device 50 in the second mode, and the head 51 records an alignment signal on the B side of the disk 1. Next, the floppy disk 20 is temporarily removed from the alignment signal recording device 50 and switched to the first mode, and then attached to the alignment signal recording device 50 again as shown in FIG. 6(b), and the head 51 aligns it to the A side of the disk 1. Record the signal. in this case,
Core play) Since the thickness of 3a and 3b is equal, the head 5
The distance between the head 51 and the A surface is equal to the distance between the head 51 and the B surface.

The floppy disk 1 with the 7 alignment signals recorded on the A side and B side of the disk 1 in this way is
1, it is attached to the floppy disk device 100 to be tested. and floppy disk device i1
00, the head 101a reproduces the 7 alignment signal of side B, the head 101b reproduces the alignment signal of side A, and the reproduced signals are inspected.

101b alignment inspection can be performed.

FIG. 7 is an exploded perspective view showing the main parts of a floppy disk 30 for head alignment according to a second embodiment of the present invention, and FIG. 8 is a sectional view showing the mounted state. In this floppy disk 30, a core plate 33m is attached to the disk 31 using image adhesive tapes 32a and 32b.

33b are attached concentrically. Core plate 33
m and 33b have the same thickness and are made of a magnetic material.

As shown in FIG. 9 when viewed from the bottom side, the upper core 34 has a PG bottle 35 fixed to it, and a spring portion 34a that acts as a chucking spring and a holder that serves as a surface for the spindle shaft. A portion 34b is formed.

This upper core 34 is a core play) 33a.

It can be attached by tightly fitting into the central opening of the core plate 33b, and can be inserted and attached from the core plate 33a side, or conversely, from the core plate 33b side.

Therefore, like the floppy disk 20 of the first embodiment, this floppy disk 30 is also mounted on a spindle 53 having a permanent magnet 52, and after recording seven alignment signals with a single-sided recording type alignment signal recording device, double-sided recording is performed. By performing a playback operation on a playback type floppy disk device, it is possible to check the alignment of a double-sided recording/playback type floppy disk device.

<Effects of the Invention> As specifically explained above in conjunction with the embodiments, according to the present invention, the alignment signal of the present invention can be recorded using a single-sided recording type alignment signal recording device without using a double-sided recording type alignment signal recording device. By recording on a floppy disk, it can be used for alignment inspection of double-sided recording/playback type floppy disk devices. Therefore, especially when developing a small-diameter 2-inch double-sided recording/playback type floppy disk device, a single-sided recording type is sufficient as a one-line signal recording device for this device, and a double-sided recording type is complicated and difficult to manufacture. There is no need to develop a new alignment signal recording device.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing the first embodiment of the present invention;
The figure is a perspective view showing the upper core of the first embodiment, FIGS. 3 and 4 are explanatory views showing the assembled state of the first example, FIGS. 5 and 6 are explanatory views showing the inspection state, and FIGS. FIG. 7 is an exploded perspective view showing the second embodiment of the present invention, FIG. 8 is a sectional view showing the second embodiment, and 9yAE is a perspective view showing the one-flange core of the second embodiment. In the drawing, 1.31 is a disk, 2 a, 2 b, 32 a, 32 b are double-sided adhesive tapes, 3 a, 3 b, 33 a, 33 b are core plates, 7 is a chucking spring, 8.34 is a Upper core, 9.35 is the PG pin.

Claims (1)

[Scope of Claims] A magnetic recording medium in the form of an annular plate, and a magnetic material in the form of an annular plate, which are attached concentrically to the magnetic recording medium with the magnetic recording medium in between, and mutually thick A pair of core plates of equal size, an upper core that is in the shape of an annular plate and is attached concentrically to either of the pair of core plates in a removable manner, and a pair of upper cores that are fixed to the upper core. A floppy disk for head alignment, comprising: a magnetic pin that, when attached to either of the core plates, forms a magnetic path for guiding magnetic flux from one core plate side to the other core plate side.