JPH10144030A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely release a magneto-optical disk with a small releasing force by increasing the thickness of a hub part of a disk-like recording medium than the thickness of the information recording area and supporting the outer side part of the turntable supporting surface of this hub part. SOLUTION: The thickness of the hub part 16a at the inner peripheral side of the magneto-optical disk 16 is formed to be thicker than the thickness of the information recording area 16b of the outer peripheral side, and also a projected line 23b in contact with the position at the outer side in the radial direction than the part to be brought in contact with the turntable of the hub part 16a is provided inside the head access window part 17b of a lower shell 14 positioned at the side where the turntable of a cartridge casing is arranged, and when the chucking is released, the magneto-optical disk 16 is separated from the turntable by supporting the hub part 16b with the projected line 23b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk-shaped disk such as an optical disk or a magneto-optical disk used as an information recording medium of a disk recording / reproducing apparatus for recording and / or reproducing information signals such as audio, video and computer data. The present invention relates to a disk cartridge in which a recording medium is rotatably accommodated. In particular, a release force of a sufficient magnitude required when releasing the disk can be applied to the disk-shaped recording medium, so that the disk-shaped recording medium can The present invention relates to a disk cartridge capable of easily and reliably performing an attaching / detaching operation.

[0002]

2. Description of the Related Art Conventionally, an optical disk apparatus generally includes a semiconductor laser, a diffraction grating, a beam splitter, a collimator lens, an objective lens, a concave lens, a cylindrical lens, a photodetector, and the like. It is configured to have a recording surface. This optical disk apparatus irradiates a laser beam emitted from a semiconductor laser through a diffraction grating, a beam splitter, and a collimator lens to irradiate an information recording surface from an objective lens, and irradiates the irradiated laser beam or reflection from the information recording surface. Recording and / or reproduction of information is performed based on the light. Then, the carriage holding the objective lens is moved (directly or rotated) in the radial direction of the disk by the carriage driving mechanism, so that the recording and / or reproduction of information is continuously performed.

[0003] A disk-shaped recording medium used in such a disk recording / reproducing apparatus is enclosed by a cartridge housing in consideration of convenience of handling and portability of a user. As a disk cartridge in which the disk-shaped recording medium is rotatably housed in a cartridge housing, for example, those having a configuration as shown in FIGS. 14 and 15 are known.

This disc cartridge 1 has a built-in write-once magneto-optical disc on which a user can record and write information such as computer data later.
4 and has a configuration as shown in cross section in FIG. That is, the disk cartridge 1 has a cartridge housing 2 formed by a pair of upper and lower shells 3 and 4, a magneto-optical disk 6 rotatably housed in a disk housing chamber 5 of the cartridge housing 2, and the like. ing. On both upper and lower surfaces of the cartridge housing 2, a head access window 7 extending radially outward from the center is opened, and the head access window 7 can be opened and closed by a slide shutter 8. At the center of the magneto-optical disk 6, a hub 6a having a hub hole 9 is provided.
The thickness of the hub 6a is the same as the thickness of the information recording area 6b on the radially outer side.

The disk cartridge 1 having such a configuration is mounted on a disk recording / reproducing apparatus, for example, mounted on a disk tray which can be taken in and out of the apparatus main body. At this time, the slide shutter 8 of the disk cartridge 1 is automatically released by a shutter opening / closing mechanism provided in the apparatus main body, and information on the lower surface of the magneto-optical disk 6 exposed from the released head access window 7 is provided. The optical head faces the recording surface, and the magnetic field head faces the opposite upper surface.

[0006] A turntable is inserted into the head access window 7 from below, and its tip is inserted into the hub hole 9 of the magneto-optical disk 6. The chucking plate is attracted by the magnetic force of the magnet built in the turntable, and the magneto-optical disk 6 is mounted and fixed on the turntable by the clamping force between the chucking plate and the disk support surface, and is integrally rotated and driven. It has become so.

When the disk cartridge 1 is ejected from the disk recording / reproducing apparatus, it is necessary to apply an external force to the magneto-optical disk 6 held on the turntable by the magnetic force of the magnet to separate the disk cartridge 1 from the turntable. As a disk release method for releasing the disk by applying an external force for releasing the disk to the magneto-optical disk 6, for example, the following method can be mentioned.

First, the turntable is moved downward while the magneto-optical disk 6 is fixed and supported.
Second, the disk cartridge 1 is moved upward while the turntable side is fixedly supported. Part 3
Is a combination of the above 1 and 2, which moves the turntable downward and also moves the disk cartridge 1 upward. In any of the release methods 1 to 3, in any case, a part of the lower shell 4 of the cartridge housing 2 presses a part of the information recording surface of the information recording area 6b of the magneto-optical disk 6. By making the pressing force larger than the magnetic force of the magnet, the magneto-optical disk 6 can be released from the support surface of the turntable.

[0009]

However, in the above-described disk cartridge, polycarbonate is generally used as the material of the disk substrate of the magneto-optical disk, and has relatively low rigidity. Therefore, if the thickness of the magneto-optical disk is set to be uniform and thin over the whole, elastic deformation occurs on the outer portion from the turntable support surface of the hub portion, and the magneto-optical disk warps into a bowl shape, overcoming the magnetic force of the magnet, and Sufficient force to release the disk is not transmitted to the magneto-optical disk. As a result, in the case of a magneto-optical disk in which the thickness of the disk substrate is set to be uniform and thin over the whole, it becomes necessary to apply a release force to the magneto-optical disk more than before, and the reliability of the operation of the chucking mechanism is increased. There was a problem that lack was a concern.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a hub portion of a disk-shaped recording medium is made thicker than an information recording area portion. By supporting the outer part than the surface,
It is intended to solve the above problems.

[0011]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and the like, and achieves the above object by reducing the thickness of a hub portion on an inner peripheral side of a disc-shaped recording medium by recording information on an outer peripheral side. It is formed to be thicker than the thickness of the region portion, and inside the head access window portion of the shell located on the side where the turntable of the cartridge housing is arranged, radially outside the contact portion of the hub portion with the turntable. A support projection is provided for contacting the portion, and when chucking is released, the hub is supported by the support projection to separate the disk-shaped recording medium from the turntable.

According to the present invention, since the hub portion of the disk-shaped recording medium is supported by the supporting projections by the above-described structure, when a force for releasing the disk-shaped recording medium from the turntable is applied. In addition, the force can be reliably transmitted to the disk-shaped recording medium to reliably perform the disk releasing operation, and the reliability of the operation of releasing the disk-shaped recording medium can be improved.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 show a first embodiment of the present invention. FIG. 1 is a perspective view of a disk cartridge with a sliding shutter opened, FIG. 2 is an exploded perspective view of the disk cartridge, and FIG. X-ray enlarged sectional view, FIGS.
FIG. 7 is a diagram showing a disk-shaped recording medium. 8 to 10 show a second embodiment of the present invention. FIG. 8 is an exploded perspective view of a disk cartridge, and FIG.
FIG. 10 is a sectional view of a portion corresponding to X-rays, and FIG.

FIG. 11 is an explanatory view showing a state in which the disk cartridge according to the present invention is mounted on the apparatus main body, and FIG. 12 shows a relationship between the disk cartridge mounted on the apparatus main body, the turntable, and the recording / reproducing head. Explanatory diagram,
FIG. 13 is an explanatory diagram of the chucking operation.

As shown in FIGS. 1 to 3, the disk cartridge 11 has a cartridge housing 12 formed by overlapping a pair of upper shells 13 and lower shells 14, and is formed in the cartridge housing 12. Disk 16 showing a specific example of a disk-shaped recording medium rotatably accommodated in a disk accommodation chamber 15, and a head access window 17 formed in upper and lower shells 13 and 14.
a, 17b which can be opened and closed.

The upper shell 13 is formed of a rectangular thin plate-like body, and has an inner surface provided with an upper concave portion 20a forming the upper half of the disk accommodating chamber 15.
A ring-shaped partition wall 21a is formed in a, and the upper half of the disk storage chamber 15 is set therein. A shutter sliding portion 22a formed of a wide concave portion to which the slide shutter 18 is slidably provided is provided in a portion from the upper surface to the front surface of the upper shell 13.

The upper shell 1 is provided on the shutter sliding portion 22a.
3 includes a central portion, and a portion extending from the central portion to the vicinity of the front surface has an upper head access window 17a into which a magnetic field head constituting one of information recording and / or reproducing heads is removably inserted. Is open. The inner surface of the upper shell 13 on the center side of the upper head access window 17a is provided with an arc-shaped ridge 23a extending continuously in the circumferential direction. The protruding shape 23a regulates movement of the magneto-optical disk 16 in the thickness direction by more than a predetermined amount and fluctuation of the tilt. On the front side of the upper head access window 17a, there is provided a head escape groove 24a for facilitating insertion of a magnetic field head inserted from the lateral direction.

The lower shell 14 is configured to have a substantially antisymmetric relationship with the upper shell 13. That is, a lower concave portion 20b that forms the lower half of the disk accommodating chamber 15 is provided on the inner surface of the lower shell 14, which is a thin rectangular plate, and a ring-shaped partition wall is formed in the lower concave portion 20b. 2
1b is formed, and the lower half of the disk storage chamber 15 is set therein. A shutter sliding portion 2 including a wide recessed portion to which a slide shutter 18 is slidably mounted is provided on a portion from the lower surface to the front surface of the lower shell 14.
2b is provided.

The lower shell 1 is provided on the shutter sliding portion 22b.
The lower head access window portion 17b into which the optical head constituting the other of the information recording and / or reproducing head is removably inserted is provided in the central portion from the central portion to the vicinity of the front surface. Is open. The inner surface of the lower shell 14 on the center side of the lower head access window 17b is provided with an arc-shaped ridge 23b extending continuously in the circumferential direction. The projection 23b is a specific example of a supporting projection, which supports the central portion of the lower surface of the magneto-optical disk 16 and releases the magneto-optical disk 16 from the disk support surface of the turntable as described later. It is an input unit for applying external force. On the front side of the lower head access window 17b, there is provided a head escape groove 24b for facilitating insertion of the optical head inserted from the lateral direction.

Further, in a space formed on one side of the front side of the lower shell 14, upper and lower head access windows 17a,
A coil spring 25 that constantly biases the slide shutter 18 so as to close the shutter 17b is housed. One spring piece of the coil spring 25 is engaged with the inner wall of the lower shell 14, while the other spring piece passes through a slit groove 26 formed on the front surface and is engaged with the slide shutter 18. I have.

As shown in FIGS. 4A and 4B, the magneto-optical disk 16 has a thick hub portion 16a formed at the center.
And a thin information recording area 16b which is developed radially outward from the hub 16a.
An information recording surface on which information recording is possible is set to the lower surface of the information recording area 16b. The hub portion 16a of the magneto-optical disk 16 is formed such that the surface on the information recording surface side is the same plane, while the opposite information recording surface side is thick at a predetermined height.
As a result, the rigidity of the hub 16a is reduced by the information recording area 16b.
Is set higher than the rigidity.

A hub hole 19 is formed in the center of the hub 16a of the magneto-optical disk 16. As a material of the magneto-optical disk 16, for example, a synthetic resin such as polycarbonate (PC) or polyolefin is suitable, but it is needless to say that other synthetic resins can be used. For example, various materials such as a glass material and an aluminum alloy can be used. The material of the upper and lower shells 13 and 14 is, for example, ABS resin (acrylonitrile-butadiene-styrene resin), HIPS (high impact polystyrene), PP
A synthetic resin such as (polypropylene) is suitable, but other synthetic resins can also be used.

In a state where the pair of shells 13 and 14 are vertically overlapped and the magneto-optical disk 16 is accommodated in the disk accommodating chamber 15, the contact surfaces thereof are fused or bonded with an adhesive, or By using fixing means such as fastening with a screw member, the cartridge housing 1
2 are assembled and integrally formed. The slide shutter 18 is mounted on the upper and lower shutter sliding portions 22a and 22b so that the upper and lower head access windows 17a and 17b can be opened and closed at the same time.

The slide shutter 18 has a shape (a U-shaped cross section) in which a middle portion of a strip-like member is bent at two places, and one upper surface piece 18a opens and closes the upper head access window 17a. The other lower surface piece 18b opens and closes the lower head access window 17b. The distal ends of the upper surface piece 18a and the lower surface piece 18b of the slide shutter 18 are slidably locked by pressing plates 27 fixed to the upper and lower shells 13, 14, whereby the upper surface piece 18a and the lower surface piece 18b Escape is prevented. And
The slide shutter 18 is urged by the above-described coil spring 25, and the upper and lower head access windows 17a, 17b
It is configured to close.

As another embodiment of the above-described magneto-optical disk 16, a structure as shown in FIGS. 5 to 7 can be applied. The magneto-optical disk 16A shown in FIG.
On the contrary to the magneto-optical disk 16, a thick hub portion 16a is formed on the information recording surface side. FIG.
The magneto-optical disk 16B shown in FIG. 7 has a metal hub 28 fitted and fixed from above in the hub hole 19 of the magneto-optical disk 16 shown in FIG.
In FIG. 5, a metal hub 28 is fitted and fixed to the hub hole 19 of the magneto-optical disk 16 shown in FIG.

The metal hub 28 has a cylindrical portion 28a having a diameter larger than its height, a bottom portion 28b provided so as to close the lower surface of the cylindrical portion 28a, and a metal hub 28 which extends outward at an upper end portion of the cylindrical portion 28a. And a positioning hole 28d into which a positioning projection of the turntable is inserted is formed in the center of the bottom surface portion 28b. The cylindrical portion 28a of the metal hub 28 is fitted into the hub hole 19 of the magneto-optical disk 16 to be integrally formed. As a material of the metal hub 28, for example, stainless steel (for example, SUS410 or the like) which can be attracted by a magnet is suitable, but it is a matter of course that other magnetic materials can be applied.

The above-described disk cartridge 11
As another embodiment of the present invention, one having a configuration as shown in FIGS. 8 and 9 can be applied. In the disk cartridge 31 shown in the second embodiment, the outermost peripheral portion of the magneto-optical disk 32 is also made thick. As for the outermost peripheral portion of the magneto-optical disk 32, as shown in FIG. 10, various forms can be adopted depending on the combination with the shape of the hub portion 16a.

That is, the magneto-optical disk 32 shown in FIG.
Has a hub portion 32a which is built up on the opposite side of the information recording surface of the information recording area portion 32b on the inner peripheral portion, and has a ring-shaped thick portion 33 protruding toward the information recording surface on the outermost peripheral portion. Is provided. The magneto-optical disk 32 shown in FIG.
A is a hub portion 32a which is built up on the opposite side of the information recording surface.
Is provided on the inner peripheral portion, and a ring-shaped thick portion 33 protruding on the side opposite to the information recording surface is provided on the outermost peripheral portion similarly to the hub portion 32a. Further, the magneto-optical disk 3 shown in FIG.
2B has an inner peripheral portion having a hub portion 32a which is built up on the information recording surface side, and a ring-shaped thick portion 33 protruding toward the information recording surface side like the hub portion 32a on the outermost peripheral portion. It is provided. Then, the magneto-optical disk 32C shown in FIG.
Has a hub portion 32a built up on the information recording surface side on the inner peripheral portion, and a ring-shaped thick portion 33 protruding toward the opposite information recording surface side is provided on the outermost peripheral portion.

Further, in the second embodiment, as shown in FIG. 9, a receiving portion 23c corresponding to the ridge 23a of the inner peripheral portion is provided also at the outermost peripheral portion of the lower concave portion 20b of the lower shell 14. Have been. The receiving portion 23c is provided with the turntable 4
This is effective for a mechanism that releases the chucking by moving the disk cartridge 11 without moving the disk cartridge 5. Also,
The upper shell 13 is provided with a posture restricting projection 34 for restricting the movement of the magneto-optical disk 32 in the radial direction and preventing the tilt of the magneto-optical disk 32 from changing more than a predetermined amount.

The disk cartridge 11 having such a structure is, for example, as shown in FIGS.
It is used in a write-once type disc recording / reproducing apparatus 40 which shows a specific example of a disc recording / reproducing apparatus, and records and reproduces information. This disk recording / reproducing device 40
The apparatus main body 41 includes a disk tray 42 and the like. A disk tray 42 is mounted on the apparatus main body 41 from a disk insertion slot 43 provided in the apparatus main body 41.

The disc tray 42 is moved forward and backward by a tray driving mechanism (not shown) to move the disc tray 42 shown in FIG.
It is possible to move linearly between the disk tray 42 shown in FIG. 12 and the disk setting position at which the disk tray 42 has moved to the rearmost end. The disk tray 42 is provided with an opening 44 having a predetermined width extending rearward from the center portion. When the disk cartridge 11 is mounted, the opening 44 is provided in the head access windows 17a, 17b of the disk cartridge 11.
The turntable 45, the optical head 46, and the magnetic field head 47 can enter and exit the windows 17a and 17b.

The disk cartridge 11 placed on the disk tray 42 and inserted into the apparatus main body 41 is
The slide shutter 18 is automatically opened by a shutter opening / closing mechanism (not shown), and the upper and lower head access windows 1 are opened.
7a and 17b are opened, and the hub 16a and a part of the information recording area 16b of the magneto-optical disk 16 are vertically exposed. A turntable 45 is inserted into the hub 16a of the magneto-optical disk 16 from below, and a part of the information recording area 16b of the magneto-optical disk 16 is opposed to the magneto-optical disk 16 with the magneto-optical disk 16 interposed therebetween. Optical head 46
And each tip of the magnetic field head 47 is inserted.

The turntable 45 is fixed to a rotating shaft 48a of a spindle motor 48 fixed to a mechanical chassis, and the operation of the spindle motor 48 causes the turntable 45 to rotate integrally. As shown in FIG. 13, a magnet 56 is integrally buried at the tip of the turntable 45, and the magneto-optical disk 16 is fixed to the turntable 45 by the magnetic force of the magnet 56, whereby the magneto-optical disk is fixed. The disk 16 is configured to be driven to rotate integrally with the turntable 45. Reference numeral 57 denotes a yoke for increasing the magnetic force of the magnet 56.

That is, in the case of the magneto-optical disk 16 (16A or the like) without the metal hub 28, a chucking plate (not shown) rotatably supported by the apparatus main body 41 is attracted by the magnet 56, and this chucking is performed. The magneto-optical disk 1 is held by the clamping force between the plate and the turntable 45.
6 is fixed. In the case of the magneto-optical disk 16B (16C or the like) having the metal hub 28, the magnet 56
The metal hub 28 is directly attracted to the turntable 4 by the attracting force of the metal hub 28.
Fixed to 5.

The optical head 46 and the magnetic field head 4
7 is structurally integrated through a link mechanism 49 connected in a U-shape so that the magneto-optical disk 16 can be simultaneously rotated and moved with access. The link mechanism 49 includes a lower link 50 having an optical head 46 fixed to an upper surface, an upper arm 51 having a magnetic field head 47 fixed to a lower surface, and the upper arm 51 and the lower link 50 on the side of the magneto-optical disk 16. And a side link 52 that is connected at the side. Further, a feed shaft 53 is threaded through the lower link 50 in a state where the axis is directed in the radial direction of the magneto-optical disk 16, and one end of the feed shaft 53 is rotatably supported by a bearing 54. On the other hand, a motor 55 for rotating the feed shaft 53 is connected to the other end of the feed shaft 53. The feed shaft 53 and the motor 55 constitute a head feed mechanism.

The operation of the head feed mechanism causes the feed shaft 5 to move.
The link mechanism 49 is moved in the axial direction 3, and the optical head 46 and the magnetic field head 47 are reciprocated in the radial direction along each surface of the magneto-optical disk 16 via the link mechanism 49. Although not shown, the optical head 46 facing the information recording surface of the magneto-optical disk 16 is connected to a high-frequency amplifier, and the magnetic field head 47 is connected to a drive circuit.

When the disc cartridge 11 is inserted into the disc recording / reproducing apparatus 40 having such a configuration,
The magneto-optical disk 16 is fixed to the turntable 45 through the operation shown in FIG. 13, and the releasing operation is performed thereafter. That is, in the initial state of the insertion of the disk cartridge 11, as shown in FIG. 13A, the magneto-optical disk positioned inside the head access window 17b opened by the movement of the slide shutter 18 is located above the turntable 45. Sixteen hub portions 16a are opposed to each other. The hub 16a of the magneto-optical disk 16 is
The lower shell 14 is placed on a ridge 23b provided on the inner peripheral edge of the lower head access window 17b, and is supported by the lower shell 14 by the ridge 23b.

As described above, before the magneto-optical disk 16 is mounted on the apparatus main body 41, the cartridge housing 1
The position of the magneto-optical disk 16 in the disk storage room 1 is
The thick hub portion 16a is always supported by the ridge 23b in this play.

From this state, when the turntable 45 is moved up or the disk cartridge 11 is lowered, or by performing these operations simultaneously, the turntable 45 is brought closer to the magneto-optical disk 16 as shown in FIG. 13B. The tip of the rotary shaft 48a on the 45 side is fitted into the positioning hole 28d of the metal hub 28 of the magneto-optical disk 16, whereby the magneto-optical disk 16 is positioned relative to the turntable 45 in the radial direction. At the same time, the metal hub 28 is attracted by the magnetic force of the magnet 56, and the magneto-optical disk 16 is fixed to the turntable 45 by the magnetic force of the magnet 56.

Subsequently, as shown in FIG. 13C, by raising the turntable 45 to raise the magneto-optical disk 16 by a predetermined amount, the lower surface of the hub portion 16a becomes convex.
The rotation of the magneto-optical disk 16 is enabled by being separated from the support surface of the magneto-optical disk 3b. In this state, the magneto-optical disk 16 is driven to rotate, and the optical head 4 is moved with respect to the information recording surface.
6 and the magnetic field head 47 are operated to record new information on the information recording surface, or
Information recorded in advance on the information recording surface can be read.

When the disk cartridge 11 is to be removed from the apparatus main body 41 after the recording / reproducing operation is completed, first, the turntable 45 is used to remove the magneto-optical disk 16 from the turntable 45.
Is performed to open the. This disk opening operation is performed by performing an operation opposite to the above-described disk mounting operation. That is, the turntable 45 is lowered from the state shown in FIG.
1 or do these at the same time. This allows
The turntable 45 and the disk cartridge 11 move in a direction in which they are relatively separated from each other, and change to the state shown in FIG. 13B. As a result, the protruding ridges 23b of the lower shell 14 abut on the outer side of the clamp area of the thickened hub portion 16a of the magneto-optical disk 16.

Subsequently, by further increasing the force for separating the turntable 45 from the disk cartridge 11, if the separation force is greater than the attraction force of the magnet 56, the force is moved from the turntable 45 to the magneto-optical disk 16. Is transmitted to the ridge 23b through the
3b is input to the lower shell 14. At this time, the force applied to the magneto-optical disk 16 as a reaction force from the lower shell 14 side always acts on the hub portion 16b which is a thick portion, so that the elasticity of the disk as in the case where a thin portion is pressed. The deformation does not increase. Therefore, the force applied to release the chucking force of the magneto-optical disk 16 by the magnet 56 can be reduced, and the release of the magneto-optical disk 16 can be reliably performed with a small release force.

In the case of the second embodiment described above, FIG.
By providing the thick part 33 at the outermost periphery as shown in A to D, the magneto-optical disks 32, 32A, 32B, 32C
The magneto-optical disk 16, whose rigidity was shown in the first embodiment,
16A, 16B, and 16C, and the effect that the magneto-optical disk can be reliably released with a small releasing force can be further increased. Further, by moving the disk cartridge 11 with the turntable 45 fixed, the outermost thick portion 33 abuts on the receiving portion 23c of the lower shell 14 to regulate the elastic deformation of the disk. Also, the effect that the release force can be reduced can be obtained. Furthermore, the positional error in the radial direction of the receiving portion 23c can be made rough, which facilitates the production and contributes to the saving of the releasing force.

As described above, the present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, an example in which a magneto-optical disk is used as a disk-shaped recording medium has been described. Disc) and other optical discs and other disc-shaped recording media. Further, in the above embodiment, an example was described in which the present invention was applied to a disk recording / reproducing apparatus which also serves as a recording / reproducing apparatus as a disk recording / reproducing apparatus. .

In the above embodiment, an example in which the present invention is applied to a tray-type disk recording / reproducing apparatus has been described. However, the present invention can be applied to a slot-in type disk recording / reproducing apparatus. Further, in the above-described embodiment, the example in which the circumferentially continuous ridges are used as the support protrusions has been described. However, a plurality of protrusions formed at predetermined intervals in the circumferential direction can be used as the support protrusions. . Thus, the present invention can be variously modified without departing from the spirit thereof.

[0046]

As described above, according to the present invention,
A support projection is provided on the cartridge housing, and the support projection supports the thickened hub portion so that the disk-shaped recording medium is separated from the turntable. When releasing the medium, the elastic deformation of the disk can be reduced to reduce the acting force required at the time of release, and the effect that the small release force can reliably release the magneto-optical disk can be obtained. Can be In addition, since the elastic deformation of the disk-shaped recording medium is suppressed to a small value, the effect that the time-dependent change of the disk-shaped recording medium and the distortion due to the temperature can also be suppressed can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a disk cartridge according to the present invention, with a slide shutter opened.

FIG. 2 is an exploded perspective view showing a first embodiment of the disk cartridge of the present invention.

FIG. 3 is a sectional view taken along line XX of FIG. 1 showing the first embodiment of the disk cartridge of the present invention.

4A and 4B show a first embodiment of a disk-shaped recording medium according to a first embodiment of the disk cartridge of the present invention, wherein FIG. A is a perspective view and FIG.

5A and 5B show a second embodiment of the disc-shaped recording medium according to the first embodiment of the disc cartridge of the present invention, wherein FIG. A is a perspective view and FIG.

FIGS. 6A and 6B show a third embodiment of the disc-shaped recording medium according to the first embodiment of the disc cartridge of the present invention, wherein FIG. 6A is a perspective view and FIG.

7 shows a fourth embodiment of the disk-shaped recording medium according to the first embodiment of the disk cartridge of the present invention. FIG. 7A is a perspective view, and FIG.

FIG. 8 is an exploded perspective view showing a second embodiment of the disk cartridge of the present invention.

FIG. 9 is a sectional view of a portion corresponding to line XX of FIG. 1 showing a second embodiment of the disk cartridge of the present invention.

FIG. 10 shows a disc-shaped recording medium according to a second embodiment of the disc cartridge of the present invention.
FIG. B is a cross-sectional view of a main part of the second embodiment, FIG. C is a cross-sectional view of a main part of the third embodiment, and FIG. D is a cross-sectional view of a main part of the fourth embodiment. is there.

FIG. 11 is a perspective view showing a use state of the disk cartridge of the present invention, in a state of being mounted on a disk tray.

FIG. 12 is an explanatory view showing a use state of the disk cartridge of the present invention in cross section.

FIG. 13 is an explanatory diagram for explaining a disk chucking operation and a release operation of the disk cartridge of the present invention.

FIG. 14 is an exploded perspective view showing a conventional disk cartridge.

FIG. 15 is a sectional view showing a conventional disk cartridge.

[Explanation of symbols]

11 disk cartridge, 12 cartridge housing, 13 upper shell, 14 lower shell, 15 disk accommodation room, 16, 16A, 16B, 16C, 3
2, 32A, 32B, 32C magnetic disk (disk-shaped recording medium), 16a hub, 16b information recording area, 17a, 17b head access window, 19
Hub hole, 23b convex stripe (support convex part), 28 metal hub, 33 thick part, 40 disk recording / reproducing device (disk recording and / or reproducing device), 45 turntable, 46 optical head, 47 magnetic field head

Claims (3)

[Claims] 1. A cartridge housing in which a disk accommodating chamber is formed by stacking a pair of shells, a disk-shaped recording medium rotatably accommodated in the disk accommodating chamber, and provided in the cartridge housing. And a turntable capable of chucking the disk-shaped recording medium by a magnetic force of a magnet. The hub portion is formed to be thicker than the information recording region on the outer peripheral side, and the hub is provided inside the head access window portion of the shell located on the side of the cartridge housing on which the turntable is arranged. A support projection is provided that contacts the part radially outside the contact part of the part with the turntable. During grayed released, the disk cartridge being characterized in that to support the hub portion with the supporting convex portion so as to separate the disk-like recording medium from the turn table. 2. The disk cartridge according to claim 1, wherein said support projection is formed of an arc-shaped projection that is continuous in a circumferential direction. 3. The disk cartridge according to claim 1, wherein the outermost peripheral portion of the disk-shaped recording medium is formed to be thicker than the upper information recording region.