JPH07220350A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain a recording/reproducing device provided with the copy protecting function such as disabling the read-out owing to the dislocation of a recording track by mechanically making the centering position of a recording medium eccentric against a normal device. CONSTITUTION:A rotary shaft 10 is pivotally supported by a chassis 104 of the recording/reproducing device so as freely rotatable through a bearing, and the one end is connected with a spindle motor. At another end of this rotary shaft 10, a shaft 11 of the centering member for a flexible disk is integrally provided by a screw part 12. An axial center B of this shaft 11 is set at the position dislocated by the shifted amount E in the radial direction against an axial center A of the rotary shaft 10. When a carriage 61 mounted with a magnetic head 60 which is a signal converter, is moved to the position of the track 20 to write into the eccentric recording medium, the shaft 11 is shifted from the axial center B, then the track 20 with the axial center A of the rotary shaft 10 as the center is formed. Thus, the magnetic head is unable to trace on the track in the eccentric state, thereby the read-out is disabled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus, and more particularly, to a recording / reproducing apparatus mounted with a disk cartridge containing a flexible disk such as a magnetic disk as an information recording medium.

[0002]

2. Description of the Related Art For example, a flexible disk drive device is known as a conventional recording / reproducing device. Such a flexible disk drive device includes a chassis as a base, a holder for accommodating a recording medium, a guide means composed of a slide plate formed with a cam means for guiding the holder to a recording position and a discharge position, and a feed unit. A lead screw which is a transfer means having a groove formed therein, a stepping motor which rotationally drives the lead screw, and a lower magnetic head which is a signal converter are mounted, and an engaging member which engages with a feed groove of the lead screw at one end. A carriage having a follower pin that is a coupling means and capable of moving the magnetic head in the radial direction of the recording medium, and an upper magnetic head that is a second converter facing the lower magnetic head is attached to one end, and the other end is attached. Is screwed to the carriage and a spindle motor that drives the hub stand on which the recording medium is placed to rotate around the spindle axis. It is mainly composed of a.

Here, the chucking member of the recording medium will be further described with reference to FIG. 11. The hub base is so arranged that the centering member 71 is projected at the other end of the rotary shaft 70 whose one end is connected to the spindle motor. 73 is provided, and a positioning pin 74 for the recording medium is arranged at a position deviated from the rotary shaft 70 so as to project from the hub base 73.
The rotary shaft 70 and the centering member 71 have the same diameter, and the hub base 73 is rotated by rotationally driving the rotary shaft 70 by a spindle motor. By placing the recording medium having the centering member 71 inserted on the hub base 73, the recording medium on the hub base 73 is rotationally driven about the axis of the rotary shaft 70.

In such a recording / reproducing apparatus for an exchangeable recording medium, compatibility between the apparatuses is maintained. For example, a flexible disk in which data is written by one apparatus can be read by another apparatus. Has become.

By the way, in recent years, with the widespread use of systems equipped with these recording / reproducing devices, it is becoming important to manage confidentiality of data written in recording media.

That is, there is an increasing need to provide copy protection so that data on a recording medium will not be copied or read by a third party.
However, such a copy protect means is not provided in the conventional recording / reproducing apparatus, and the countermeasure is left to the user.

A first object of the present invention is to provide a recording / reproducing apparatus having a copy protection function.

A second object of the present invention is that when the recording medium is mounted on the hub of the recording medium, the recording medium moves in a direction away from the centering member, and positioning is performed at a position where the center of the recording medium is eccentric. It is an object of the present invention to provide a recording / reproducing apparatus in which tracks are formed eccentrically and data cannot be read by a conventional apparatus using a chucking member.

A third object of the present invention is a rotating body which cannot read data with a device using a conventional chucking member and can have a large fixing area such as caulking margin. It is an object of the present invention to provide a recording / reproducing device capable of more firmly fixing the hub base to the rotation shaft.

[0010]

A first object of the present invention is to provide a centering member which is detachably engaged with the engaging portion of a disk-shaped recording medium having an engaging portion at its center, and a centering member which is rotatable. In a recording / reproducing apparatus including a rotating body to be driven and a converter for reading or writing a signal facing the disc-shaped recording medium, the axis of the centering member is relative to the axis of rotation of the rotating body. And eccentric first means.

The first object is, in the first means,
This is achieved by the second means in which the rotational axis center position of the rotating body with respect to the rotational axis center position of the disk-shaped recording medium is decentered by approximately half the recording track interval or more.

[0012] The second object is to provide a rotating body, a rotating shaft having a protruding portion that passes through the center of the rotating body and protrudes to the upper surface, and a positioning member arranged eccentrically from the radial direction of the rotating shaft. In the recording / reproducing apparatus having the above, it is achieved by the third means in which the diameter of the rotating shaft in the protruding portion is set to approximately 3.8 mm or less.

The third object of the present invention is that, in the second means,
This is achieved by the fourth means in which the diameter of the rotating shaft on the lower surface side of the protrusion is larger than the diameter of the protrusion.

[0014]

By the first means, the centering position of the recording medium is mechanically deviated from that of an ordinary apparatus, so that a recording track is formed on the recording medium with a large eccentricity. Unable to read.

By the second means, the rotary shaft center position of the rotary body relative to the rotary shaft center position of the disk-shaped recording medium is eccentric by more than half of the recording track interval. Therefore, in the conventional apparatus using the chucking member. The magnetic head cannot trace the eccentric recording track, and data cannot be read.

By the third means, the diameter of the rotating shaft in the protrusion is set to be approximately 3.8 mm or less. Therefore, when the recording medium is mounted on the hub of the recording medium, the recording medium moves in a direction away from the centering member for recording. Positioning is performed at a position where the center of the medium is eccentric by E, and recording tracks are formed eccentrically, so that data cannot be read by a device using a conventional chucking member.

By the fourth means, the diameter of the rotary shaft on the lower surface side of the protrusion is larger than the diameter of the protrusion, so that the recording track is formed eccentrically. Therefore, the device using the conventional chucking member is used. Cannot read data. Further, a large fixing area such as caulking margin can be taken, and the hub base, which is a rotating body, can be more firmly fixed to the rotating shaft.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

A flexible disk drive device as a recording / reproducing device according to the present invention will be described with reference to FIGS. 1 to 10.

FIG. 1 is a sectional view of a chucking member of a recording / reproducing apparatus according to a first embodiment of the present invention, and FIG. 2 is a chucking state of a recording medium using the chucking member of the first embodiment and a conventional state. FIG. 3 is an explanatory view comparing the chucking states of recording media using the chucking member of FIG.
FIG. 4 is an explanatory diagram showing a track of a recording track and a track of a recording medium when reading or writing data on the recording medium using the recording / reproducing apparatus according to the second embodiment. FIG. FIG. 5 is an explanatory view of a flexible disk, FIG. 5 is an explanatory view of a recording track in a 3.5-inch flexible disk of 135 TPI, FIG. 6 is a sectional view of a chucking member of a recording / reproducing apparatus according to a second embodiment of the present invention, and FIG. Explanatory diagram comparing the chucking state of the recording medium using the chucking member of the second embodiment and the chucking state of the recording medium using the conventional chucking member,
FIG. 8 is a cross-sectional view of a chucking member of a recording / reproducing apparatus according to the third embodiment, and FIG. 9 shows the overall structure of the recording / reproducing apparatus to which each embodiment of the present invention is applied (the cartridge holder is removed). FIG. 10 is a plan view showing the overall structure of a recording / reproducing apparatus to which each embodiment of the present invention is applied.

First, the overall configuration of the flexible disk drive device will be described with reference to FIGS. 4, 9 and 10.

In these figures, the disk drive device 1
Reference numeral 01 denotes a lower cover 102, a control board connected to the spindle motor, and a chassis 10 arranged on the control board.
4 and a carriage 107 provided on the chassis 104 and provided with a pair of magnetic heads 105 and 106 at the tip.
And a carriage transfer device 109 that transfers the carriage 107 in a radial direction of a magnetic sheet (magnetic disk) 56 (see FIG. 4) described later, and a spindle motor 103 that is projected onto the chassis 104 and attached to the chassis 104. Hub base 142 having a centering member described later
And a cartridge holder 111 that holds the disk cartridge 50 (see FIG. 4) in the apparatus and is vertically movable with respect to the chassis 104 (a direction perpendicular to the paper surface in FIG. 10) and a cartridge holder 111. A slide plate 114 for moving up and down 111 and an eject lever 112 for introducing the disc cartridge 50 to the loading position and pushing it out from the loading position to the ejection position.
And an upper cover (not shown).

The chassis 104 is formed by pressing an iron plate or an aluminum alloy, a carriage transfer device 109 is provided on the rear side of the disk drive device 101 which is the upper side in FIGS. 9 and 10, and a hub base is on the front side which is the lower side. 142 is provided, and the cartridge holder 111 and the slide plate 114 are centered around the hub base 142.
Is provided.

The carriage transfer device 109 is swingably supported by a carriage 107 on which a lower magnetic head 105 is mounted and an anti-magnetic head mounting end of the carriage 107, and a hold case 1 on which an upper magnetic head 106 is mounted.
16 and the carriage 1 on the left side of the carriage 107
Guide shaft 117 for supporting 07, a screw shaft 119 arranged in parallel with guide shaft 117 and having a spiral feed groove formed in the outer peripheral portion thereof, and carriage 1
The follower pin 120 and a support member 122 that supports the follower spring are provided to protrude from the main body 07. The carriage 107 has a guide shaft 1 via a bearing.
The slider 17 is slidably supported and is movable along the radial direction of the magnetic sheet 56 mounted on the hub base 142. The follower pin 120 is integrally formed with the support member 122, and the follower spring is fixed to the lower surface of the support member 122 with a set screw. The screw shaft 119 is elastically held by the follower spring and the follower pin 120 to prevent the follower pin 120 from being separated from the feed groove. One end of the screw shaft 119 is connected to the stepping motor 115 and rotates in synchronization with the rotation of the stepping motor 115.
Then, when the screw shaft 119 rotates, the follower pin 120 converts the rotational motion into a linear motion, and the carriage 107 reciprocates along the guide shaft 117 according to the rotation amount of the screw shaft 119, and the commanded magnetic sheet 56. Be transferred to the truck position. Reference numeral 116a is a load arm portion provided on the hold case 116 and engaged with an arm portion of a cartridge holder 111 described later.

The cartridge holder 111 is integrally formed from a U-shaped cartridge holding portion 140 on both sides and an upper surface portion 141 made of a thin plate connecting the cartridge holding portion 140. A portion supports the lower surface of the disk cartridge 50, and all other lower surface portions are opened so that the hub base 142 and the later-described hub 55 (see FIG. 4) of the magnetic sheet 56 can face each other. The insertion side A has a cartridge insertion port 143. The cartridge holder 140 of the cartridge holder 111 includes the chassis 1
04, the projections 146 engaging with the guide groove and the guide notch.
And 146 are formed.

Guide grooves and guide notches are formed on the inner surfaces of the side plates 147 and 148 of the chassis 104 for guiding the protrusions 146 arranged on the cartridge holding portion 140 of the cartridge holder 111. The magnetic sheet 56 is moved substantially vertically to the chassis 104 along the guides of the groove and the guide notch.
It is possible to perform loading and unloading of. This movement is performed by a cam mechanism described later that vertically moves the cartridge holder 111 according to the operation of the slide plate 114. When the cartridge holder 111 is in the loaded state, the eject button connected to the slide plate 114 is connected to the chassis. When it is pushed in the depth direction 104 (upward direction in FIG. 9), the cartridge holder 111 is pushed up in the upward direction, that is, in the unloading direction along with the movement.

The slide plate 114 is arranged on the lower surface of the cartridge holder 111. This slide plate 114
Is slidably supported by a guide slit of the chassis 104, and the slide plate 114 is allowed to slide in the front-rear direction with respect to the cartridge holder 111. The chassis 1 on which one of the side plates of the slide plate 114 abuts and slides on the protrusion 146 when not loaded.
A parallel cam portion parallel to the upper surface of 04 and an inclined cam portion formed in a downward slope on the rear (back) side with respect to the chassis 104 for lowering the cartridge holder 111 during the loading operation and raising the cartridge holder 111 during the ejecting operation, After 2
It is provided in one place. When the disc cartridge 50 is inserted, the cartridge holder 111 is lowered to the loading position. The slide plate 114 is constantly biased toward the cartridge insertion side A by the slide spring 155. The slide plate 114 has a rear end claw portion 152.
Is engaged with the lock plate 151 to be locked and held in the load position, that is, the pushing position. The slide plate 114 is integrally provided with an eject button attachment portion 156.

At the upper right portion of the cartridge holder 111 in FIG. 10, the eject lever 112 is swingably supported by the support shaft 158 while being constantly elastically biased in the eject direction (counterclockwise direction) by the eject spring 157. There is. The swinging end of the eject lever 112 comes into contact with a side end of a shutter 53, which will be described later, as the eject lever 112 rotates, and the disc cartridge 50 is rotated.
The shutter 53 is opened.

Next, the loading and unloading operations of the disk drive device 101 having the above-described structure will be described.

When the disc cartridge 50 is inserted from the unloading state, the pivot lever end of the eject lever 112 comes into contact with the side surface of the shutter 53 at the tip of the disc cartridge 50, and when the disc cartridge 50 is further pushed in, the eject lever 112 moves to that position. It rotates about the support shaft 158, and the shutter 53 is released by the rotating end of the eject lever 112, and moves inward. The disc cartridge 50 is the cartridge holder 1.
When it is inserted to the innermost part of 11, the lock plate 151 abuts and the lock plate 151 rotates in the direction of the arrow in FIG. 10, the lock of the slide plate 114 is released, and the slide spring 155 is released.
The elastic plate moves the slide plate 114 in the downward direction of FIG. 9 (in the front direction of the disk drive device 101). When the slide plate 114 is released, the shutter 53 is fully opened. Further, when the slide plate 114 is slid in the downward direction of FIG. 9 so that the hub 55 of the disc cartridge 50 is located right above the hub base 142 and the disc cartridge 50 cannot be introduced any further, the cartridge holder 111 is just moved. The protrusion 146 is set to be located above the inclined cam portion formed on the side plate 147 of the slide plate 114. When the disc cartridge 50 is further inserted, the slide plate 114 is unlocked,
The slide plate 114 is moved downward in FIG. 9 by the slide spring 155, the cartridge holder 111 is vertically lowered to the chassis 104 side along the guide groove portion and the guide cutout portion, the magnetic sheet 56 is loaded on the hub base 142, and the magnetic force is reduced. The heads 105 and 106 enter the case of the disk cartridge 50 through the head insertion holes 52 and 53 and come into contact with the magnetic sheet 56 to enable recording / reproduction.

In this way, the upper magnetic head 106 on the hold case 116 side touches the magnetic sheet 56,
The magnetic sheet 56 is sandwiched between the lower magnetic head 105 on the side of the carriage 107, and a loading state is reached, and the loading of the magnetic sheet 56 is completed.

When recording or reproduction is completed and the disc cartridge 50 is taken out, an eject operation is performed. At this time, if the eject button is pushed into the rear side of the chassis 104, the slide plate 114 is pushed.
Along with this, the cartridge holder 111 also moves to the back side, pushes up the protrusion 146 of the cartridge holder 111 along the inclined cam portion, positions the protrusion 146 on the parallel cam portion, and the cartridge holder 111 moves upward (away from the chassis 104). To move to the unload state. When the slide plate 114 is pushed further, the slide plate 114 is moved to the back side position and the lock plate 1
It is locked by 51 and also eject lever 11
2 is the support shaft 1 due to the elastic force of the eject spring 157.
The disc cartridge 50 is rotated counterclockwise in FIG. 10 about the axis 58, and ejects the disc cartridge 50 in the counter arrow A direction.
During this ejecting process, the shutter 53 of the disc cartridge 50 engaged with the eject lever 112.
Also moves in the closing direction, and will naturally be closed when ejected. Therefore, the eject lever 112 also functions as a shutter opening / closing lever. In this way, the disc cartridge 50 can be taken out by hand only after it is ejected.

The features of the present invention will be described below.

First, the first embodiment will be described with reference to FIGS.

As shown in FIG. 1, the rotary shaft 10 is rotatably supported by a chassis 104 of the recording / reproducing apparatus via a bearing, and one end thereof is connected to a spindle motor (not shown). A shaft 11, which is a centering member for the flexible disk, is integrally provided at the other end of the rotary shaft 10 by, for example, the rotary shaft 10 and a screw portion 12 provided on the shaft 11. Here, the axis B of the shaft 11 is the rotary shaft 10
It is set so as to be displaced from the axis A of A by the amount E of displacement in the radial direction.

Here, the deviation amount E will be described in more detail. The 3.5-inch flexible disk currently widely used is a hard cartridge 5 as shown in FIG.
A flexible magnetic sheet 56 is included in the number 0. An iron hub 55 is attached to the magnetic sheet 56 at a substantially central position with an adhesive or the like, and the hub 55 is exposed from the opening 51 of the cartridge 50. An opening 57 is formed in the hub 55 substantially at the center of the magnetic sheet 56, and a positioning opening 58 is formed at a position offset from the opening 57. The cartridge 50 is provided with an opening 52 at the center thereof,
A shutter 53 is provided so as to cover the opening 52 so as to be slidable in the left-right direction in FIG. The shutter 53 is provided with an opening 54 at a position corresponding to the opening 52 of the cartridge 50 when the shutter 53 is slid in the direction of the arrow D.
Through this, the magnetic head 60 faces the magnetic sheet 56 to read and write signals.

Further, in a 3.5 inch flexible disk of 135 TPI (tracks per inch), the distance between the recording tracks 20 and 20 is about 0.18 as shown in FIG.
It is 75 mm. Then, each recording track 20
Is approximately equal to the width of the read / write gap of the magnetic head 60, and is set to about 0.117 mm.

By the way, in general, the magnetic head 60 is 80%.
It is known that the data cannot be read and written if the off-track is performed. Therefore, in the embodiment of the present invention, the distance between the recording tracks 20 and 20 is about 0.
The shift amount E is set to be approximately half or more of 1875 mm, that is, about 0.0937 mm.

A hub base 13, which is a pedestal for a flexible disk, is attached to the shaft 11 by caulking or press fitting with the shaft 11 protruding, as shown in FIG. A positioning pin 14 is provided at a position eccentric from the shaft 11 so as to project from the upper surface (disk receiving surface) of the.

Next, the chucking operation of the first embodiment will be described. When the disc cartridge 50 is attached to the device using the chucking member as described above,
As shown in FIG. 2, the hub 5 of the disc cartridge 50
5 is positioned as shown by the solid line. That is, when the shaft 11 is inserted into the center hole 57 of the hub 55 and the positioning pin 14 is inserted into the positioning hole 58 of the hub 55, the positioning pin 14 is rotated by a spring (not shown) or centrifugal force.
By moving in a direction away from 1, the shaft 11 and the inner wall of the central hole 57 are pressed and held for positioning.

The one shown by the dotted line in FIG. 2 shows the chucking state when the conventional chucking member is used, but since the axis B of the shaft 11 is displaced by the displacement amount E, It can be seen that in the case where the chucking member according to the first embodiment is used, the rotation center of the recording medium is eccentric by E.

Next, reading and writing on the recording medium in the recording / reproducing apparatus in the first embodiment will be described with reference to FIG.

FIG. 3 is a view from above, and A is the rotary shaft 10.
Axis, B is the axis of axis 11, 20 is the recording track, 59
Is an outer periphery of the recording medium, 60 is a magnetic head, and 61 is a carriage. As shown in FIG. 3, the recording medium (magnetic sheet)
The center position of is shifted from the axis A of the rotary shaft 10 by a shift amount E, that is, approximately the position of the axis B of the shaft 11. However, the center of rotation of the recording medium (magnetic sheet) is the axis A of the rotating shaft 10.

A carriage 61 on which a magnetic head 60, which is a signal converter, is mounted on a recording medium thus eccentric.
Is moved to the position of the desired recording track 20 by driving the carriage transfer device 109, and when a signal is written by the magnetic head 60, it is deviated from the axis B of the shaft 11 (normal rotation center of the recording medium) and the rotation shaft 10 moves. A recording track 20 centered on the axis A is formed.

Even if the recording medium having the recording track 20 formed eccentrically in this way is mounted on another recording / reproducing apparatus having a normal chucking member and reading is attempted, the recording medium on the eccentric recording track is not removed. The magnetic head cannot trace and cannot read.

Further, as a method of forming the recording track 20 by eccentricity, a conventional chucking member is used, and the mounting position of the bearing for supporting the rotary shaft 10 of the chassis 104 is deviated as compared with the usual one. You may make it provide in a position.

In the first embodiment constructed as described above, since the axis A of the rotating shaft 10 of the chucking member and the axis B of the centering member (11) are displaced, the conventional chassis is used. It is possible to use the chucking member after assembling other constituent members to this chassis, so that only the chucking member of the embodiment can be used. Yes, the process can be managed easily. Further, even when the conventional device is reassembled into the device having the copy protection function of this embodiment after the assembling, it is possible to easily cope with it by exchanging only the chucking member.

Next, a second embodiment of the present invention will be described with reference to FIGS. 3, 6 and 7.

The second embodiment proposes a protect means suitable for a recording / reproducing apparatus using a 3.5-inch flexible disk.

In FIG. 6, the rotary shaft 30 is rotatably supported by a chassis 104 of the recording / reproducing apparatus via a bearing, and one end thereof is connected to a spindle motor (not shown). A centering member 31, which is a projecting portion of the flexible disk, is integrally provided on the upper end of the rotating shaft 30, and the centering member 31 is projected from the upper surface (disk receiving surface) of the hub base 33. Hub stand 3 for rotating shaft 30
The fixation of No. 3 is performed by caulking or press fitting.

Here, the diameter of the rotating shaft 30 having the centering member 31 was set to be about 4 mm, more precisely 3.991 mm, for the centering member and the rotating shaft of the conventional chucking member. However, it is set to about 3.8 mm. In the second embodiment, the difference between the diameter of the conventional centering member and the radius is corrected, that is, the deviation amount E is the recording track 2.
The pitch is set to be approximately half the pitch between 0 and 20.

Next, the chucking operation of the second embodiment will be described with reference to FIG. A disk cartridge 50 is provided in an apparatus using the chucking member as described above.
, The hub 55 of the disk cartridge 50 is positioned as shown by the solid line in FIG. That is, when the centering member 31 is inserted into the center hole 57 of the hub 55 and the positioning pin 34 is inserted into the positioning hole 58 of the hub 55, the positioning pin 34 is moved from the centering member 31 by a spring (not shown) or centrifugal force. The centering member 31 and the inner wall of the central hole 57 are pressed against each other and positioned in the direction in which the centering member 31 and the inner wall of the center hole 57 are moved in the direction away from each other.

The dotted line in FIG. 7 shows the chucking state when the conventional chucking member is used. As described above, the diameter of the centering member 31 is reduced by the deviation amount E. Therefore, in the case of using the chucking member according to the second embodiment, it is understood that the rotation center of the recording medium is eccentric by the deviation amount E from the normal rotation center position.

The reading / writing from / to the recording medium in the recording / reproducing apparatus equipped with the chucking member according to the second embodiment having the above-mentioned structure is similar to that of the first embodiment shown in FIG. In addition, since the recording track 20 is formed eccentrically from the normal rotation center position of the recording medium, data cannot be read by the device using the conventional chucking member. Furthermore, since the rotary shaft 30 and the centering member 31 are integrally formed without using a connecting member such as a screw, processing is easy.

Next, a third embodiment of the present invention will be described with reference to FIG.
Will be described with reference to.

The third embodiment is to further improve the chucking member of the second embodiment, omitting the description of the parts common to the second embodiment and only the differences. To do.

That is, the chucking member in the third embodiment is the upper surface of the hub base 43 (disk receiving surface).
The diameter a1 of the centering member 41, which is a more protruding portion, is set to approximately 3.8 mm. The diameter a2 of the rotary shaft 40 on the lower surface side of the centering member 41 is larger than the diameter a1 of the centering member 41. In addition,
The diameter a2 of the rotary shaft 40 on the lower surface side of the centering member 41 may be approximately 4 mm, which is the same as the rotary shaft of the conventional chucking member or larger than that. The chucking operation in the third embodiment is performed in the same manner as in the second embodiment, and the description thereof will be omitted.

Reading and writing on the recording medium in the recording / reproducing apparatus equipped with the chucking member according to the third embodiment having the above-described structure are performed in the same manner as in the second embodiment shown in FIG. Since the track 20 is formed eccentrically, data cannot be read by a device using a conventional chucking member.

Further, in the third embodiment, since only the centering portion 41 involved in chucking has a small diameter as described above, the fixing area such as caulking margin can be made large and the hub which is a rotating body. The base 43 can be more firmly fixed to the rotary shaft 40.

When the diameter of the rotary shaft 40 is formed to be the same as that of the conventional chucking member, the rotary body (hub base 4
Since it is not necessary to change the inner diameter of 3), it is possible to use the rotating body (hub base 43) in the conventional chucking member, and it is possible to reduce the material cost.

In each of the above-described embodiments, a flexible disk is used as the recording medium. However, the recording medium is not limited to this, and a recording medium having a centering hole at the center thereof, such as an optical disk, has a substantially conical shape or a tip end. The present invention can also be applied to a recording / reproducing device for recording / reproducing, or recording / reproducing using a centering member (protruding portion) having roundness.

[0062]

According to the first aspect of the invention, since the centering position of the recording medium is mechanically deviated from that of an ordinary apparatus, recording tracks are formed on the recording medium with a large eccentricity. A conventional device cannot read data, and a recording / reproducing device having a copy protection function can be provided. Moreover, since the axis of the rotating shaft of the chucking member and the axis of the centering member are offset, a conventional chassis can be used, and only the chucking member of the embodiment can be used after assembling other constituent members to this chassis. Since it is only necessary to use the ones, the conventional assembly process or assembly jig of the apparatus can be used as it is, and the process management can be easily performed. Further, even when the conventional device is reassembled into the device having the copy protection function of the present invention after assembling, it can be easily dealt with by exchanging only the chucking member.

According to the second aspect of the present invention, the position of the rotary shaft center of the rotary member relative to the position of the rotary shaft center of the disk-shaped recording medium is eccentric by more than half of the recording track interval. In the apparatus used, the magnetic head cannot trace the eccentric recording track, and data cannot be read.

According to the third aspect of the present invention, the diameter of the rotary shaft in the protruding portion is set to about 3.8 mm or less, so that when the recording medium is mounted on the hub, the recording medium moves in a direction away from the protruding portion. Then, positioning is performed at a position where the center of the recording medium is eccentric by E, and the recording track is formed eccentrically, so that data cannot be read by a device using a conventional chucking member.

According to the invention described in claim 4, since the diameter of the rotating shaft on the lower surface side of the protrusion is larger than the diameter of the protrusion, the recording track is formed eccentrically. Data cannot be read out by the device using the member. Further, a large fixing area such as caulking margin can be taken, and the rotating body can be more firmly fixed to the rotating shaft.

[Brief description of drawings]

FIG. 1 is a sectional view of a chucking member of a recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram comparing a chucking state of a recording medium using a chucking member of a recording / reproducing apparatus according to a first embodiment of the present invention and a chucking state of a recording medium using a conventional chucking member. Is.

FIG. 3 is an explanatory diagram showing a track of a recording track and a track of a recording medium when reading or writing data on the recording medium using the recording / reproducing apparatus according to the first and second embodiments of the present invention. .

FIG. 4 is an explanatory diagram of a 3.5-inch flexible disk as an example of a recording medium.

FIG. 5 is an explanatory diagram of recording tracks on a 135 TPI 3.5-inch flexible disk.

FIG. 6 is a sectional view of a chucking member of a recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 7 is an explanatory diagram comparing a chucking state of a recording medium using a chucking member of a recording / reproducing apparatus according to a second embodiment of the present invention and a chucking state of a recording medium using a conventional chucking member. Is.

FIG. 8 is a sectional view of a chucking member of a recording / reproducing apparatus according to a third embodiment of the present invention.

FIG. 9 is a plan view showing the overall structure (without the cartridge holder) of the recording / reproducing apparatus to which each embodiment of the present invention is applied.

FIG. 10 is a plan view showing an overall configuration of a recording / reproducing apparatus to which each embodiment of the present invention is applied.

FIG. 11 is a sectional view of a chucking member of a conventional recording / reproducing apparatus.

[Explanation of symbols]

 10,30,40 Rotating shaft 11,31,41 Centering member 13,33,43 Hub base 14,34,44 Positioning member 20 Recording track A Shaft axis of rotating shaft B B Centering member 11 shaft center

Claims (4)

[Claims] 1. A centering member that removably engages with the engaging portion of a disc-shaped recording medium having an engaging portion in the center, a rotating body that rotationally drives the centering member, and the disc-shaped recording medium. In a recording / reproducing apparatus provided with a converter for reading or writing a signal facing each other, the axis of the centering member is eccentric with respect to the axis of rotation of the rotating body. Playback device. 2. The recording / reproducing apparatus according to claim 1,
A recording / reproducing apparatus, wherein the rotational axis center position of the rotating body is eccentric with respect to the rotational axis center position of the disk-shaped recording medium by approximately half the recording track interval or more. 3. A recording / reproducing apparatus having a rotating body, a rotating shaft having a protrusion passing through the center of the rotating body and protruding to the upper surface, and a positioning member arranged eccentrically from the radial direction of the rotating shaft. 2. The recording / reproducing apparatus, wherein the diameter of the rotary shaft in the protruding portion is set to approximately 3.8 mm or less. 4. The recording / reproducing apparatus according to claim 3,
The recording / reproducing apparatus, wherein the diameter of the rotating shaft on the lower surface side of the protrusion is larger than the diameter of the protrusion.