JPS62125585A - Disk holding mechanism of flexible disk device - Google Patents

Abstract

PURPOSE:To keep a stable contact state between a magnetic head and a recording disk by pressing a flexible recording disk against a reference plane by means of a pressure member. CONSTITUTION:A recording disk 2 containing magnetic materials on both sides of a 'Mylar(R)' sheet is enclosed into a nonflexible cassette housing 1 for production of a recording medium 22. Then the medium 22 is guided by a groove 23 for support of the housing 1 and set and therefore both magnetic heads 7 and 8 are in contact with the disk 2. Then a pressure member 14 presses the disk 2 against both reference plane 16 and 13 by means of the force of a spring 15. Thus the disk 2 passes through an area between a reference plane 4 and the member 14 and is guided to an area between both heads 7 and 8. Thus the disk 2 is rotated stably at the areas near both heads 7 and 8 and therefore the stable contact is secured between both heads 7 and 8 and the disk 2. As a result, information of high density can be recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a recording medium case, and particularly to a recording medium suppression mechanism and a hard cartridge that maintain stable contact between a magnetic head and a flexible recording medium. It is.

[Background of the invention]

In order to develop and commercialize high-capacity flexible disks with high recording density, it is necessary to bring the recording medium into stable contact with the magnetic head. For example, with respect to metal flexible disks, the hard case type conventionally used results in a structurally unstable medium contact state, resulting in poor yield.

FIG. 2, FIG. 4, and FIG. 5 are a plan view of a conventional flexible disk device and a recording medium, and a cross-sectional view taken along plane A-A and plane B-8. Furthermore, here,
The term "recording medium" refers to a combination of a recording disk and a cassette housing into which it is inserted. 2, 4 and 5, 1 is a cassette into which a recording medium is inserted; 2 is a recording disk such as a flexible disk; 3 is a shutter into which a head is inserted; 4 is a spring for returning the shutter; 5 is a pressing member (pressure pad) for pressing the recording disk 2 against the reference surface of the cassette 1; 6 is the first reference surface; 7 is the magnetic head on side L; 8 is the magnetic head on side O; 9 10 is a magnetic head, 10 is a spindle for inserting and rotating the cassette housing l in the center, 11 is a second reference plane,
12 is a spring.

24 is also a spring, 23 is a groove for supporting the cassette case, 17 is a bottle, 20 is a first cassette opening, 21 is a first shutter opening, 22 is a recording medium (recording disk and cassette 1-shape body) It is.

As shown in the drawings, the recording medium 22 is a recording disk 2 having magnetic material on both sides of a Mylar sheet enclosed in a non-flexible cassette housing 1. This recording medium 22 is accommodated and supported by a cassette housing support groove 23 within the apparatus. This flexible disk device has a second reference plane 11 that determines the height of the recording medium 22 with respect to a magnetic head 9 that performs recording and reproduction, and a spindle 10 that rotates the recording disk 2, and a second reference surface 11 that determines the height of the recording medium 22, and a second reference surface 11 that protects the recording disk 2. The cassette housing l is pressed against the second reference surface 11 by the force of the spring 12. The recording medium 22 includes a shutter 3 that protects the recording disk 2, and a return spring 4 that returns the shutter 75 to its original state.

A pressing member (called a pressure butt) 5 is provided to press the recording disk 2 against the first base surface 6 provided inside the cassette housing, and the recording disk 2 rotates to press against the first reference surface 6 provided therein. 6
When the magnetic head 9 passes between the magnetic heads 9 after passing through the position pressed by the magnetic head 9, information is recorded and reproduced. The relationship of the arrangement of the base 1′ base etc. mentioned above is, for example,
It is disclosed in Japanese Patent No. 683. However, in order to record high-density information on the recording disk 2, it is necessary to maintain a more stable contact state between the magnetic head 9 and the recording disk 2 than ever before, and the conventional structure There is a problem that high-density information cannot be recorded.

FIG. 11, FIG. 12, and FIG. 13 are reproduction output waveform diagrams of the flexible disk device, respectively. For example, in the conventional structure, even if one rotation of the recording disk 2 at a relatively low recording density provides a reproduction voltage as shown in FIG.
As shown in the figure, the reproduction voltage deteriorates. This is mainly due to insufficient contact between the recording disk 2 and the head 9. Conventionally, when the head is in contact with the recording disk 2 in a stable state with respect to the height of the head, normal characteristics can be obtained as shown in □3Σ. Also,
In the conventional apparatus, as described in Japanese Patent Publication No. 58-17988, the cassette housing 1 is pressed against the second reference surface, and the recording disk 2 is placed on the first reference surface inside the recording medium 22. A method is shown in which the surface 6 is pressed by pre-shabat to stabilize the running of the flexible disk flowing into the magnetic head. However, in such a structure, as shown in FIG. 3, due to bending during plastic molding of the cassette housing l, bending occurs from the horizontal # (broken B), making it difficult to achieve dimensional accuracy.

FIG. 6, FIG. 7, and FIG. 8 are cross-sectional views of conventionally proposed magnetic disk drives, and diagrams showing stable regions when changing the read voltage and the height of the magnetic head. In FIG. 6, 13 is a third reference surface, 14 is a pressure butt, and 15 is a spring. It is pressed against the third reference surface 13 via the member (brella chapara h) 14. As a result, a certain amount of distortion is forcibly applied to the flexible disk in the vicinity facing the long hole for recording and reproduction.

With this structure, distortion in the vicinity of the central hole of the recording disk 2 is suppressed, so the magnetic head can make stable contact on both the inner and outer circumferential sides, and the rigidity of the disk 2 is increased. hand,
It is possible to suppress the flapping phenomenon during rotation. However, as shown in FIG. 3, the dimensional accuracy is improved due to bending during the formation of the cassette housing 1. In Kaya 7 figure.

61 in Figure 6. The reproducing voltages are shown as 1 to 1 when the dimension of δ2 is set to δ2=0.2 (constant) and sequentially changed from δ1=−0 to 1 to 0.4. Sides O and 1 of cylinder 00 and sides O and 1 of cylinder 103 are 1f
l11 has been established. Side 0 is represented by white, and side 1 is represented by black. The reproduction voltage stable region is in the range of δ1=0 to 0.3. As is clear from this, δ1. The stable region of the reproduction voltage is determined by the dimension of δ2, so δ1
．． The value of δ2 has an important meaning. In addition, the first
Figure 1 shows the case where measurements were taken outside the stable reproduction voltage region of the x7 diagram. Moreover, FIG. 8 shows δ1. The reproduced voltage when δ2 is combined with a specific value is shown. Normally, the playback voltage increases from the inner track to the outer track, but
In FIG. 8, the voltage difference between side 0 and side 1 becomes larger as each of δ1 and δ2 becomes larger.

As is clear from FIGS. 6 to 8, when it is difficult to achieve 1-dimensional accuracy, the reproduction voltage is unstable (unstable contact between the recording disk 2 and the magnetic head 9) or the medium durability is deteriorated. , and it becomes impossible to record a suitable magnetic field 2.

As a result, the yield of the recording medium 22 or magnetic recording device deteriorates.

[Purpose of the invention]

The purpose of the present invention is to improve such conventional problems, maintain a stable contact state between the magnetic head and the recording disk, improve the recording surface density of the entire device, reduce the bit cost due to large capacity recording, Another object of the present invention is to provide a recording medium case that allows the device to be made smaller.

[Summary of the invention]

In order to achieve the above object, two recording medium cases of the present invention include:
In a recording medium case for storing a flexible recording medium, one inner surface of the case has a first reference surface for guiding the recording medium having a different height from the inner surface, or a first
and a second reference plane, and the first or first and second reference plane.
The recording medium is characterized in that it includes means for pressing the recording medium against a reference surface of the recording medium.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view of a magnetic disk device showing an embodiment of the present invention, with FIGS. 9(a)(b) and 10(a)(
b) is a plan view and a side sectional view of a recording medium case showing one embodiment of the present invention, respectively. In Figure 1, 13
is a third reference surface, 14 is a pressure rose h, 16 is a fourth reference surface, and other symbols that are the same as in FIG. 2 indicate the same mechanisms. In addition, in FIGS. 9 and 10, 18 is the second cassette opening, 19 is the second shutter opening, and other parts are the same as in FIGS. 1, 4, and 5. The mechanism is shown.

A new feature of this embodiment is a mechanism in which the recording disk 2 that has passed between the pressure butt 14 and the fourth reference surface 16 is guided between the magnetic heads 7.8 in a stable state.

A recording disk 2 with magnetic material on both sides of a Mylar sheet,
A recording medium 22 is formed by enclosing it in a non-flexible cassette flute body 1. When this recording medium 22 is guided and inserted by the cassette housing support groove 23 in the magnetic disk device, the shutter 3 of the recording medium 22 opens as the bin 17 operates. As a result, the magnetic head 7.
8 comes into contact with the recording disk 2 and performs recording and reproducing operations (
(hereinafter referred to as the first cassette opening 2o) and the recording disk 2
A region provided for stabilizing the running of the cassette (hereinafter referred to as the second cassette opening 18) is opened. after that,
As shown in FIG. 1, in the cassette opening 18 of the man 2, a pressing member (hereinafter referred to as the pressure butt 14) presses the recording disc 2 against the fourth base 7g3 by the force of the spring 15.
By pressing against the surface 16 and the third reference surface 13,
The rotating recording disk 2 is protected and the surface of the recording disk 2 is cleaned by pressing through the liner inside the flexible disk.

In this way, the recording disk 2 passes between the fourth reference surface 16 and the pressure butt 14 facing each other, and the magnetic head 7
．． It is led between 8 and 8. Therefore, the magnetic head 7.8, which is pressed against the recording disk 2 by the force of the spring 24,
The variation in the height of the fourth reference surface 16 relative to the side 0 magnetic head 8 is reduced, and the recording disk 2 rotates stably in the vicinity of the magnetic head, making stable contact with the recording disk 2. This makes it possible to record high-density information.

FIG. 14 is a reproduction output waveform diagram in FIG. 1. When the mechanism shown in FIG. 1 is evaluated using the reproducing voltage of the magnetic head, as in the conventional example, in the conventional recording density shown in FIG. In this example, as shown in FIG. 14, the difference in the read voltage is improved, and even at a high density, the magnetic head can provide a sufficient read voltage of 1! ), and it can be seen that the contact state between the recording disk 2 and the head is stable. Furthermore, with the configuration of this embodiment, the housing 1 can be used for the conventional cassette 1, and a single device can be used as a high-density cassette flute body and a conventional low-density cassette housing. In addition, the pressure pad 14 and the third reference surface 1
3. The fourth reference surface 16 can be placed anywhere on the circumference of the recording disk 2 within the permitted range between the space chambers.

In this manner, in this embodiment, the contact between the magnetic head 7.8 and the recording disk 2 can be maintained stably, and high-density information can be recorded at a higher frequency. For example, horizontal recording of 20,000 to 300,008 Pr or more or vertical recording of 100,000 BPI or more is also possible.

〔Effect of the invention〕

As explained above, according to the present invention, the contact between the magnetic head and the recording disk can be maintained stably, and the air gap loss between the magnetic head and the recording disk can be reduced. It becomes possible to record information, and as a result, the recording surface density of the entire device is improved, and the bit cost 1- can be reduced due to large-capacity recording, or the device with the same capacity can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a magnetic disk device showing an embodiment of the present invention, FIG. 2 is a sectional view of a conventional magnetic disk device, and FIG. 3 is a sectional view of a conventional magnetic disk device.
The figure is a sectional view of a conventionally proposed cassette housing, and FIGS. 4 and 5 are a plan view and a sectional view of a conventional magnetic disk device.
6, 7, and 8 are a cross-sectional view of a conventionally proposed magnetic disk device, and a relationship between the reproduction voltage and the height of the magnetic head when the height is varied, and FIGS. 9 and 10 are, respectively. 11, 12, and 13 are conventional playback output waveform diagrams, and FIG. 14 is a playback output according to the present invention. FIG. cassette housing, 2: recording disk, 3: shutter, 4: shutter return sublink, 5° I4: pressing member (pressure butt), 6: reference surface of il, 7: side l magnetic head, 8:
Side 0 magnetic head, 92 magnetic head, 10 spindle, 11: second reference plane, 12, 15.24: spring, 13
: third reference plane, 16: fourth reference plane, 17: bottle, 20.
13: first and second cassette openings, 21.19:
first and second shutter openings, 22: recording medium;
23: Groove for supporting the cassette case. Patent Applicant Hitachi, Ltd. Representative Patent Attorney Toshi Isomura:, - Figure 1 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 1 δ -0, 1-0, 2-0,3 Figure 10 Figure 9
Figure (al (a) 1st] Figure 12

Claims (1)

[Claims] (1) In a recording medium case for storing a flexible recording medium, one inner surface of the case has a first reference surface for guiding the recording medium that is different in height from the inner surface, or a first reference surface and a first reference surface for guiding the recording medium. 1. A recording medium case comprising: two reference surfaces; and means for pressing the recording medium against the first reference surface or the first and second reference surfaces.