JPH04370590A - Disk cartridge and its record reproducing device - Google Patents

Abstract

PURPOSE:To realize a high density recording surface and to prolong the life of a disk and record and reproducing heads. CONSTITUTION:A pair of a first disk guiding sections 25 and 26, which are facing to each other through a flexible disk 29, are provided inside a shell 21 and a pair of a second disk guiding sections 27 and 28 are provided in parallel with the first disk guiding sections 25 and 26 and the surface of the disk with a prescribed gap. These disk guiding sections 25 to 28 are placed in the direction of the hear movement and furthermore, are configured by the guiding section which is located for and aft and sides of the disk rotational direction of a head port 24. Therefore, recording surfaces are created in the region including the in and outside of the peripheral of the flexible disk 29 and simultaneously a stable rotational operation of the flexible disk 29 is realized a during disk rotation.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge equipped with a disk such as a magnetic disk as a recording medium, and a recording/reproducing apparatus therefor.

0002

2. Description of the Related Art In general, a disk cartridge houses the disk in a box-shaped cartridge body to prevent damage to the disk and dust from adhering to the disk, and also to simplify the chucking mechanism. For this reason, there is a known device in which a magnetic plate for magnetic clamping is attached to the disk.

Conventionally, as this type of disk cartridge, for example, those shown in FIGS. 3(A) and 3(B) have been employed. To explain this based on the same figure, in the same figure, what is indicated by the reference numeral 1 is a box-shaped shell, and the casing 2 has a table insertion hole 2a in the center and is open on one side.
The housing 2 includes a lid 3 that closes the opening 2b of the housing 2, and is entirely made of a synthetic resin material such as ABS. This shell 1 is provided with two head insertion holes 4 (only the lower head insertion hole is shown) that open inside and outside the shell and extend in the diametrical direction of the table insertion hole 2a. Four arc-shaped disc regulating ribs 5 are formed on the top of the disc 5, arranged in parallel at a predetermined interval.

Reference numeral 6 denotes a shutter for opening and closing the head insertion hole 4, and is slidably provided on the shell 1.

Reference numeral 7 denotes a flexible disk, such as a magnetic disk, which has recording/reproducing surfaces 7a and 7b on both its front and back sides, and is rotatably housed in the shell 1, with a hub mounting opening on both sides of the disk in the center. A hole 8 is provided.

Reference numeral 9 denotes a hub having a flange 9a that comes into contact with one end surface of the flexible disk 7 during recording and reproduction, and is inserted and fixed into the hub mounting hole 8, and is made entirely of a magnetic material such as stainless steel. . An annular presser plate 10 made of a magnetic material is also inserted into the insertion tip of the hub 9 .

11 is a motor having a rotating shaft 11a that can be inserted into and removed from the table insertion hole 2a and the hub 9;
It is fixed to a chassis 12 for a recording/reproducing device.

Reference numeral 13 denotes a turntable having a circular shape in plan view as a pedestal, which is attached to the tip of the rotating shaft 11a, and is entirely made of the same material as the hub 9. This turntable 13 has the rotating shaft 1
An annular recess 13a is provided extending around the periphery of the recess 1a, and a disk receiving surface 13b that contacts the end surface of the flange 9a during recording and reproduction is formed at the opening periphery of the recess 13a. Then, the recess 1 of this turntable 13
A magnet 14 for suctioning and gripping the flexible disk 7 is mounted inside 3a.

Reference numeral 15 denotes a gimbal that moves forward and backward in the radial direction of the flexible disk 7 by an actuator 16;
It is provided on the side of the rotating shaft 11a, and a contact type recording/reproducing head 17 that can be inserted into and removed from the head insertion hole 4 is held at the tip end thereof.

In the figure, arrows A1 and A2 indicate the forward and backward directions of the shutter 6, and arrows B indicate the direction of the flexible disk 7.
, C1 and C2 are the recording/reproducing head 17.
Indicates the direction of advance and retreat.

In order to perform recording and reproduction on the disk cartridge constructed as described above, the flexible disk 7 is suspended at approximately the middle position within the shell 1 and rotated at high speed in the direction of arrow B by the motor 11, and at the same time, the recording and reproduction head is rotated. 17 is the recording/reproducing surface 7a, 7 of the flexible disk 7.
arrows C1 and C by the actuator 16.
This is done by advancing and retreating in two directions. At this time, Figure 4
Two pads 18,1 as shown in (A) and (B)
The recording/reproducing head 9 is inserted into the head insertion hole 4 together with the recording/reproducing head 17 and comes into contact with both sides of the flexible disk 7.

Note that (A) in the same figure shows the recording/reproducing surfaces 7a and 7b.
This figure shows the case of recording and reproducing on a flexible disk 7 having a recording and reproducing surface 7b on both sides, and FIG.

[0013]

[Problems to be Solved by the Invention] However, in conventional disk cartridges, the flexible disk 7 is only held by suction at the center during recording and reproduction (during disk rotation). The periphery becomes a free edge, which increases vibration, and the inner periphery of the flexible disk 7 also has a large surface runout due to the influence of the mechanical accuracy of the hub 9 itself and the chucking accuracy of the magnet 14, etc.
In many cases, no signal surface is formed on the inner and outer periphery of the so-called landing zone.

That is, even if signal surfaces are formed on the inner and outer peripheral edges of the flexible disk 7, the recording/reproducing head 17 does not come into good contact with these signal surfaces due to disk vibration or disk surface runout, resulting in a decrease in recording/reproducing reliability. This is because you end up doing it.

As a result, the recording surface for audio signals, video signals, data signals, etc. is formed only in areas other than the inner and outer peripheral edges of the flexible disk 7, making it impossible to achieve the high density recording surface that has been available in recent years. There was a problem.

[0016]Furthermore, if there is vibration or surface wobbling in the flexible disk 7 during recording/reproducing, the tracking ability of the flexible disk 7 with respect to the recording/reproducing surfaces 7a, 7b becomes worse. Pacing loss occurs, and the contact pressure of the recording/reproducing head 17 against the flexible disk 7 increases in this portion, resulting in a problem that the quality life of the flexible disk 7 and the recording/reproducing head 17 is reduced.

The present invention and another invention have been made in view of the above circumstances, and it is an object of the present invention to make it possible to increase the density of recording surfaces in recent years, and to extend the quality and life of disks and recording/reproducing heads. The present invention provides a disc cartridge and a recording/playback device for the same.

[0018]

[Means for Solving the Problems] A disk cartridge according to the present invention includes a shell having an opening for inserting a recording/reproducing head, and a disk rotatably housed within the shell and having a recording/reproducing surface. A pair of first disk guide portions are provided in the shell, each facing each other via the disk, and a pair of second disk guide portions are provided in parallel with the first disk guide portions at a predetermined interval in the direction of the disk surface, The second disk guide portion and the first disk guide portion are formed by guide portions that extend in the head advance/retreat direction and are located on the front and rear sides of the opening in the disk rotation direction.

Further, a recording and reproducing device for a disk cartridge according to another aspect of the present invention includes a pedestal having a disc receiving surface to which a disk can be attached and removed, and a recording and reproducing head that moves forward and backward in the direction of the disc receiving surface of the pedestal. The recording/reproducing head is constituted by a head facing between a first disk guide section and a second disk guide section.

[0020]

In the present invention and other inventions, when the disk rotates, the disk is guided through the minute gaps between the first disk guide parts and between the second disk guide parts.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the structure of a disc cartridge according to the present invention and a recording/reproducing apparatus for a disc cartridge according to another aspect of the present invention will be explained in detail with reference to embodiments shown in the drawings.

FIGS. 1A, 1B, and 1C are a plan view and a sectional view showing the inside of a disc cartridge according to the present invention and a disc cartridge recording/reproducing apparatus according to another invention of the present invention. In the same figure, what is indicated by the reference numeral 21 is a box-shaped shell, which has a table insertion hole 22a in its center and has a casing 22 that opens on one side and a lid 23 that closes an opening 22b of this casing 22. The entire body is made of a synthetic resin material such as ABS. This shell 21 has two head insertion holes 2 that open inside and outside the shell and extend in the diametrical direction of the table insertion hole 22a.
4, and arc-shaped disk regulating ribs (not shown) arranged in parallel at a predetermined interval on the same circumference are formed inside. Inside this shell 21, there is a pair of first disk guide parts 25, 26 that are opposed to each other via a flexible disk (to be described later), and a predetermined interval between these first disk guide parts 25, 26 in the direction of the disk surface. A pair of second disk guide portions 2 arranged in parallel with each other.
7 and 28 are provided.

The first disk guide portions 25, 26 and the second disk guide portions 27, 28 are formed by guide portions that extend in the head advance/retreat direction and are located on the front and rear sides of the table insertion hole 22a in the disk rotation direction. has been done. In addition, these first disk guide portions 25, 26 and second disk guide portions 27, 28 are made of wear-resistant materials such as SiO2, Al2O3, and SiC with a particle size of 0.1 to 0.5 μm.
Alternatively, disk guide surfaces 25a to 28a are each formed by depositing fine particles of Si3N4 or the like. The width W and height H of each disc guide part 25 to 28 are set to 2 to 3 mm and 0.1 to 0.5 mm, respectively, and the length is determined from the inner peripheral edge of the disc (table insertion hole 2).
The dimensions are set from the opening periphery of 2a to the outer periphery of the disk.

Reference numeral 29 denotes the disk guide surfaces 25a to 28a.
Recording and reproducing surfaces 29a and 29b facing each other with a small gap
It is a flexible disk, such as a magnetic disk, which has on both its front and back sides, and is rotatably housed in the shell 21, and has a hub mounting hole 30 that opens on both sides of the disk in the center. The recording and reproducing surfaces 29a and 29b of this flexible disk 29 have a thickness of, for example, 25 to 25 mm.
It is formed by sputter-depositing or coating Co--Cr, barium ferrite, etc. on both sides of a base material made of PET resin or the like with dimensions of 150 μm and 65 mm in diameter.

Reference numeral 31 denotes a hub having a flange 31a that comes into contact with one end surface of the flexible disk 29 during recording and reproduction, and is inserted and fixed into the hub mounting hole 30, and is made entirely of a magnetic material such as stainless steel. . An annular presser plate 32 also made of a magnetic material is inserted into the insertion tip of the hub 31 .

Reference numeral 33 denotes a motor having a rotating shaft 33a that can be inserted into and removed from the table insertion hole 22a and the hub 31;
It is fixed to a chassis 34 for a recording/reproducing device.

Reference numeral 35 denotes a turntable having a circular shape in plan view as a pedestal, which is attached to the tip of the rotating shaft 33a, and is entirely made of the same material as the hub 31. This turntable 35 is provided with an annular recess 35a extending around the rotating shaft 33a, and a disk receiving surface 35b that comes into contact with the end surface of the flange 31a during recording and reproduction is provided at the opening periphery of the recess 35a. It is formed. Then, the recess 3 of the turntable 35
A magnet 36 for suctioning and gripping the flexible disk 29 is mounted inside 5a.

Numerals 37 and 38 are parallel plate springs each having a trapezoidal shape in side view, and are provided on one side of the rotating shaft 33a, and are moved forward and backward in the direction of the disk receiving surface of the turntable 35 by an actuator 39. It is composed of Both leaf springs 37 and 38 have a thickness of 0.
The contact type recording/reproducing head 40 facing between the first disk guide section 26 and the second disk guide section 28 has a head auxiliary plate 41 with a thickness of 0.1 mm at the tip. Fixed through.

Reference numeral 42 denotes a lead wire wound around the recording/reproducing head 40.

It is assumed that the recording/reproducing head 40 also faces between the first disk guide section 25 and the second disk guide section 27. The shell 21 also has a head insertion hole 24.
A shutter (not shown) is slidably provided to open and close the shutter.

In the figure, reference numeral B indicates the rotational direction of the flexible disk 29, and C1 and C2 indicate the direction of rotation of the flexible disk 29.
Indicates the direction of advance and retreat.

In order to perform recording and reproduction on the disk cartridge constructed as described above, the flexible disk 29 is suspended at approximately the middle position within the shell 21 and is rotated at high speed in the direction of arrow B by the motor 33, and at the same time, the recording and reproduction head is rotated. 40 on the recording/playback surface 2 of the flexible disk 29
9a and 29b and move the actuator 39 forward and backward in the directions of arrows C1 and C2. At this time, the flexible disk 29 is guided through the small gaps between the first disk guide section 25 and the first disk guide section 26 and between the second disk guide section 27 and the second disk guide section 28.

Therefore, in this embodiment, the first disk guide portions 25 and 26 and the second disk guide portion 2 of the flexible disk 29 are rotated during disk rotation (during recording and reproduction).
Since vibrations and surface runout between the flexible disk 29 and the flexible disk 29 can be eliminated, a recording surface for audio signals, video signals, data signals, etc. can be formed in the area including the inner and outer peripheral edges of the flexible disk 29.

In addition, in this embodiment, vibration and surface wobbling of the flexible disk 29 can be eliminated during recording and reproducing.
The recording/reproducing head 40
Spacing loss between the flexible disk 29 and the flexible disk 29 can be prevented, and the contact pressure of the recording/reproducing head 17 against the flexible disk 29 (contact pressure of 0.5 grams or less) can be reduced.

Furthermore, in this embodiment, the formation of the disk guide surfaces 25a to 28a in the disk guide portions 25 to 28, respectively, prevents the flexible disk 29 and the disk guide surfaces 25a to 28a from sticking due to wetting when the disk is stopped. In addition, stable rotational operation of the flexible disk 29 can be obtained during disk rotation.

In this embodiment, an example is shown in which the recording/reproducing surfaces 29a and 29b are formed on both the front and back sides of the flexible disk 29, but the present invention and other inventions are not limited to this. The present invention can also be applied to a flexible disk 29 with a recording/reproducing surface 29b formed on one side as shown in FIG. 2, in the same manner as in the embodiment.

Furthermore, in this embodiment, the case where the recording/reproducing head 40 comes into contact with the flexible disk 29 is limited to the case where the application is limited, but the present invention and other inventions are applicable to the type where the recording/reproducing head 40 does not come into contact with the flexible disk 29. Of course, the present invention can also be applied to other types in the same way as the embodiments.

[0038]

As described above, the present invention includes a shell having an opening for inserting a recording/reproducing head, and a disk rotatably housed within the shell and having a recording/reproducing surface. A pair of first disk guide portions are provided in the shell, each facing each other via a pair of first disk guide portions, and a pair of second disk guide portions are provided in parallel with the first disk guide portions at a predetermined interval in the direction of the disk surface. The second disk guide section and the first disk guide section are formed by guide sections that extend in the head forward/backward direction and are located on the front and back sides of the opening in the disk rotation direction. It is equipped with a pedestal having a disk receiving surface to which a disk can be attached and removed, and a recording/reproducing head that moves forward and backward in the direction of the disk receiving surface of the pedestal, and the recording/reproducing head is connected to a first disk guide section and a second disk guide section. Since the disk is configured with a head that faces between the first and second disk guides, when the disk rotates, it is guided through the minute gaps between the first disk guide and the second disk guide and between the second disk guide and the second disk guide.

Therefore, it is possible to eliminate vibrations and surface runout between the first and second disk guide portions of the disk when the disk rotates, so that audio signals, video signals, and data are transmitted to the area including the inner and outer peripheries of the disk. It is possible to form a recording surface for signals, etc., and it is possible to achieve the high density recording surface that has been developed in recent years.

[0040]Furthermore, being able to eliminate the vibration and surface wobbling of the disk during disk rotation improves the ability of the recording/reproducing head to follow the recording/reproducing surface, thereby preventing spacing loss between the recording/reproducing head and the disk. Can be done.

[0041] Therefore, since the contact pressure of the recording/reproducing head against the disk can be reduced, stable rotational movement of the disk can be obtained when the disk is rotated.
It is possible to extend the life of the disk and the recording/reproducing head.

[Brief explanation of the drawing]

FIGS. 1A, 1B, and 1C are a plan view and a sectional view showing the inside of a disc cartridge according to the present invention and a disc cartridge recording and reproducing apparatus according to another invention of the present invention.

FIG. 2 is a sectional view showing another embodiment.

FIGS. 3A and 3B are a plan view and a sectional view taken along line bb--b of the conventional disk cartridge and the inside of the disk cartridge recording and reproducing device.

FIGS. 4A and 4B are cross-sectional views showing a state of contact between a head and a disk in a conventional recording/reproducing device.

[Explanation of symbols]

21...Shell, 24...Head insertion hole, 25, 26...First
Disk guide section, 27, 28...Second disk guide section, 2
5a to 28a...Disc guide surface, 29...Flexible disk, 29a, 29b...Recording/reproducing surface, 35...Turntable, 35b...Disc receiving surface, 40...Recording/reproducing head.

Claims (3)

[Claims] 1. A shell having an opening for inserting a recording/reproducing head, and a disk rotatably housed within the shell and having a recording/reproducing surface, and a pair of disks facing each other with the disk interposed therebetween. One disk guide is provided in the shell, and a pair of second disk guides are provided that are parallel to the first disk guide at a predetermined distance in the disk surface direction, and these second disk guides and the first disk A disk cartridge characterized in that the guide section is formed by a guide section that extends in the head advancing and retreating direction and is located on the front and rear sides of the opening in the disk rotation direction. 2. The disk cartridge according to claim 1, wherein the first disk guide portion and the second disk guide portion are formed with a disk guide surface made of fine particles having wear resistance. 3. A disc storage device comprising: a pedestal having a disc receiving surface to which the disc of claim 1 or claim 2 can be attached and removed; and a recording/reproducing head that moves forward and backward in the direction of the disc receiving surface of the pedestal; A recording/reproducing apparatus for a disk cartridge, characterized in that it is constituted by a head facing between the first disk guide section and the second disk guide section according to claim 1.