JP2651333B2 - Disk cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge for an optical disk or the like.

[0002]

2. Description of the Related Art Generally, in an optical disk drive, a rotational drive is faithfully transmitted to a recording / reproducing position, that is, a turntable, with respect to an optical disk (disk cartridge) inserted from the outside of the apparatus, and eccentric mounting is performed. A disk clamp function is required to prevent this. Here, in the related art, a so-called mechanical mechanism comprising a disc pressing member disposed at a position facing the turntable and a drive mechanism for moving the disc pressing member from the retracted position during loading of the disc (cartridge) to the pressed position on the turntable.・ The chucking method was adopted.

However, in response to recent demands for smaller and thinner devices, a magnet chucking method has been proposed. According to this method, as shown in FIG. 8 , a magnetic plate 2 having a flange structure made of a ferromagnetic material is provided concentrically and integrally with a center portion of an optical disk 1 and installed on a turntable 3 having a centering portion. The magnetic plate 2 is magnetically attracted by the permanent magnet.
The turntable 3 is driven to rotate by a spindle motor 4. This method has a simple configuration and can be said to be an effective chucking method for downsizing the device. Also, highly errors during writing and reading with respect to the disc itself as a recording medium (i.e., the error rate before correction by the electrical circuit 10 to ⁵ -10 ~ about ⁶⁾ hard case member in order to avoid It is required that the optical disk 1 is housed in a so-called cartridge type (therefore, the optical disk 1 is actually housed in a rectangular case member). Thus, it can be said that the adoption of such a cartridge type / magnet chucking method is effective for an optical disk, particularly for a write-once type mainly dealing with computer data.

However, on the other hand, the existence of a digital audio disk (CD = compact disk), which has advanced in the field of optical disks, and a CD-ROM for recording and reproducing data and video signals as one application thereof cannot be ignored. is there. That is, even in the above-described write-once optical disk drive, such a CD or CD-R
This is because enabling access to the OM disk is important for improving the developability and added value of the device. However, the problem here is that such a CD-RO
This means that the M disk is not of a cartridge type and does not have a magnetic member corresponding to the magnetic plate 2. As a result, in order to fix the CD disk 5 having no magnetic plate on the turntable 3,
For example, as shown in FIG. 7 , the disk can be magnetically clamped between the magnet or the magnetic material of the turntable 3 by using a clamper 6 made of a magnet or a magnetic material, or mechanically clamped by using another pressing member. 5 will be chucked. In any case, there is no compatibility between the cartridge type optical disk and the exposed type CD disk as described above. This is due to the difficulty in realizing (designing) a loading mechanism that allows both forms of cartridges and disks, and causes a problem in mounting a magnetic plate for each CD disk during use.

[0005] From the above, as shown in FIG.
It is conceivable to make the exposed type CD disk 5 or the like freely insertable and settable in the rectangular cartridge 7 to make it compatible with the cartridge type optical disk. In this case, the cartridge 7 is provided with a shutter 9 having a U-shaped cross section for opening and closing the reading opening / closing window 8 movably in the direction of arrow A, as in the case of a normal cartridge type optical disk.

[0006]

A left and right side end adjacent to one side end having a shutter 9 has a disk insertion opening for inserting the CD disk 5 into the cartridge 7 and a door member for opening and closing the disk opening. Or, when it is provided in, there is the following inconvenience.

First, with the opening and closing movement of the shutter 9,
The door member may be opened carelessly. Second,
If a disc insertion port is formed at these left or right ends or at the left and right sides, the bending in the cartridge thickness direction due to the formation of the disc insertion port as indicated by a virtual line in the drawing may hinder the smooth movement of the shutter 9. Third, when loading, dimensional accuracy is required for the width W of the cartridge 7. However, if a door member is provided at the left or right end or at the side that can contribute to such width W, the dimensional accuracy becomes poor. , Loading may be hindered.

[0008]

A shutter having a U-shaped cross section for opening and closing the opening window is moved along one side end of the cartridge body formed of a hard case member having an opening window. In the freely provided disk cartridge, a disk insertion opening for inserting and removing an exposed disk is formed at the other end located opposite to the one end of the cartridge body, and the disk insertion opening is closed openably. A pivot point is formed at one end of the door member ,
The fulcrum is held between the cartridge body and
Locking means for holding the door member in a closed state is defined as the door member.
It was formed on the cartridge body .

[0009]

Since the disk insertion opening and the door member are located on the other side opposite to the one side end having the shutter, the door member may not be opened carelessly even when the shutter is opened and closed. without it without hindering the movement of the shutter even produced a deflection cartridge member in the disc insertion opening portion, and, rather also damaging the width that affect loading, further, the door
The member can be securely attached to the disc insertion slot.
Reduce the gap between the cartridge body and the door member.
Can improve dustproofness.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. The present embodiment relates to a disk cartridge applied to, for example, a magnetic chucking type disk drive. First, a disk drive of a magnet chucking type is provided. As shown in FIG. 2, the driving device mainly includes an external turntable 11 which is connected to a spindle motor 10 and rotates. Here, the turntable 11 has a built-in magnet (not shown), and is provided with an aligning shaft 12 protruding from an upper end thereof, which is positioned on the shaft. Thus, the optical disk of the cartridge type / magnet chucking type can be chucked as it is.

In this embodiment, a disk drive such as a CD or a CD-ROM which does not basically have a magnetic plate can be chucked for such a disk drive. . As shown in FIG. 3 and the like, the disc 13 is housed in a rectangular hard case member (cartridge main body) 14 so as to be detachably inserted into a cartridge as described later. Here, the disc 13 has a center hole 13a of a predetermined diameter at the center, an information recording portion is formed around the center hole 13a toward the outer peripheral direction, and the outermost peripheral portion is a non-recording portion. And
In the inner peripheral portion of the case member 14, a groove 14a for mounting and holding a non-recording portion of the disc 13 when the disc 13 is not chucked is formed as shown in FIG. In the center of the case member 14, there are formed center holes 14b and 14c having a predetermined diameter through which the external turntable 11 can be inserted. An opening window 14d for writing / reading is formed in a slot shape at a radial position corresponding to the center hole 14b.

Further, a shutter 15 which is bent toward the center holes 14b and 14c and has a substantially U-shaped cross section is slidably attached to one end of the case member 14. Here, a long hole 15a for writing / reading which is elongated in the radial direction of the disc 13 is formed at a predetermined position on the back surface (the side of the center hole 14d) of the shutter 15, and the shutter 15 extends in a direction orthogonal to the longitudinal direction of the long hole 15a. It can slide. Normally, the cartridge is urged by urging means (not shown) so as to assume a position as shown in FIG.
At the time of loading for inserting 4), the shutter 15 is opened by this loading mechanism, and the slot 15a is
As shown in (1), the operation corresponding to the opening window 14d and corresponding to the position of the center hole 13a of the disk 13 is the same as in the case of a normal optical disk cartridge.

The case member 14 is provided with a magnetic flange 16. The magnetic flange 16 is formed of a magnetic material in a disk shape and has an annular groove 16a having a predetermined width on the outer peripheral surface thereof, and has a diameter smaller than the diameter of the central holes 14b and 14c of the case member 14 as shown in FIG. It is formed as a small diameter one. Thus, the magnetic flange 16 is detachable from the case member 14 and is attached in a loosely fitted state. The magnetic flange 16 is loosely fitted to the case member 14 on the opposite side of the external turntable 11, that is, on the side of the center hole 14c in FIG. That is, the external turntable 11, the disk 13, the magnetic flange 16 from below.
Are set in order. In addition, an alignment hole 16b that engages with the alignment shaft 12 is formed on the bottom surface of the magnetic flange 16. Further, the shutter 15 is formed with an extended piece 15b extending to the vicinity of the center hole 14c, and the extended piece 15b is cut out in a semicircular shape smaller in diameter than the magnetic flange 16 and is chamfered in a tapered shape. An engaging portion 15c having a size and a thickness to be engaged with the annular groove 16a of the magnetic flange 16 at the closed position is formed.
That is, when the magnetic flange 16 is in a single state,
, But the engaging portion 15c of the shutter 15
Is prevented from falling off by engaging with the annular groove 16a.

In such a basic configuration, when the magnetic flange 16 is not mounted on the disk drive, the magnetic flange 16 has a smaller diameter than the center hole 14c as shown in FIG. Joint 15c
The lock is held in a state where it does not fall. That is, the magnetic flange 16 does not rattle even in the non-chucking state, and the magnetic flange 16 made of the magnetic material contacts the recording surface of the free disk 13 in the case member 14 and causes scratches or rattle. Never. Also, when considering the disk 13 and the case member 14, only the non-recording portion of the disk 13 contacts the groove 14a, and the recording portion is not damaged.

At the time of loading such a cartridge (case member 14) into a disk drive, the shutter 15 is moved by a loading mechanism as shown in FIG.
Is driven to slide as shown in FIG.
It is in a state of being located in the radial direction corresponding to 3a. Such opening movement of the shutter 15 causes the engagement portion 15
2 and 6, the magnetic flange 16 comes out of the annular groove 16a of the magnetic flange 16, and the magnetic flange 16 is in a free state. At this time, the case member 14 is loaded by the loading mechanism onto the disk drive of the magnet chucking type as shown in FIG. 2, and the external turntable 11 enters the center hole 14b of the case member 14; Center hole 13 of disc 13
It comes into contact with the bottom surface around a. The external turntable 11 containing a magnet attracts the free magnetic flange 16 located above the disk 13, and the disk 13 is clamped between the external turntable 11 and the magnetic flange 16. (Ie, magnet chucked). At this time, the alignment shaft 12 is engaged with the alignment hole 16b,
Be aligned. As a result, when the external turntable 11 is rotated by the spindle motor 10, the disk 13 in the case member 14 is also integrally rotated.

In this manner, even a disk 13 such as a CD or a CD-ROM can be driven to rotate by a cartridge type / magnet chucking type disk drive. At this time, 200 ~ 500rpm
Even when the disk 13 rotates at a high speed and receives a high torque motion, the holding state of the disk 13 is stable,
The surface runout and the surface angle can be suppressed within the allowable values. That is, the method of clamping a disk between a turntable and a magnetic flange (clamper) by magnetic force is a method generally and widely used in current CD players.
There is no problem in terms of the fluctuation of disk surface runout accuracy and durability due to such chucking. Here, the magnetic flange 1
Since 6 can be made of inexpensive sheet metal or the like, the cost can be reduced and a CD-ROM compatible optical disk drive can be obtained. Further, since the magnetic flange 16 is independent of the disk 13 and is detachable from the case member 14, even if the disk 13 such as a CD-ROM is of a double-sided type, one magnetic flange 16 can be used. It is only necessary to change the installation direction of the magnetic flange 16 to, for example, the center hole 14b side without using the disk 13, and it is not necessary to take out the disk 13 from the case member 14 and replace it. Is easy to handle.

The structure for inserting the disc 13 in the single state into the case member 14 will now be described with reference to FIG. First, in this embodiment, a disk insertion slot 17 for inserting and removing the disk 13 is formed at the other end of the case member 14 opposite to one end where the shutter 15 is provided. Further, a door member 19c that rotatably closes the disk insertion port 17 is provided using a fulcrum 18c provided at one end of the disk insertion port 17 as a rotation fulcrum. A groove (not shown) constituting a part of the groove 14a of the case member 14 is formed inside the door member 19c, and has a substantially U-shaped cross section. This door member 1
A projection 21c is formed on the upper end on the tip side of 9c, and a concave portion 22c for locking the projection 21c with the door member 19c closed is formed on the ceiling surface of the disk insertion slot 17 on the case member 14 side. Therefore, the disk 13 may be inserted into the case member 14 with the door member 19c opened and the disk insertion opening 17 opened, and then the door member 19c may be closed and the projection 21c may be locked by the recess 22c.

Therefore, according to the present embodiment, the disc insertion slot 17 and the door member 19c are located at opposite sides of the shutter 15 and do not interfere with each other. With the door member 19c
There is no inadvertent opening. Therefore, the stored disk 13 does not accidentally come out. Even if the case member 14 forms the disk insertion slot 17 and is bent in the thickness direction at this portion, the case member 14 is located farthest from the shutter 15, and the bending prevents the shutter 15 from moving. There is no such thing. Furthermore, since the presence of the door member 19c does not affect the dimensional accuracy of the width W of the case member 14, the dimensional accuracy of the width W is always ensured during loading, and a normal loading operation is ensured.

[0019]

As described above, according to the present invention, a shutter having a U-shaped cross section for opening and closing the opening window is provided at one end of the cartridge body comprising a hard case member having an opening window. In a disk cartridge movably provided along an end, a disk insertion opening for inserting and removing an exposed disk is formed at the other end located opposite to the one end of the cartridge main body. A pivot point is formed at one end of the door member to open and close the door
Then, this rotation fulcrum is clamped by the cartridge body.
Locking means for holding the door member in a closed state.
Since the door member and the cartridge body are formed ,
Since the disc insertion opening and the door member are located at the opposite sides of the shutter farthest away from the shutter, there is no inconvenience that the door member is opened carelessly even when the shutter is opened and closed. Even if the cartridge body is bent at the mouth, it does not hinder the movement of the shutter, does not impair the width dimension affecting loading, and furthermore, the door member is
It can be securely inserted into the disc insertion slot and
Reducing the gap between the cartridge body and the door member
Therefore, the dust-proofing property can be enhanced, and in particular, there is an effect that an exposure-type disc that can be reproduced alone can be used as a cartridge-type disc, and the disc can be replaced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional side view during loading.

FIG. 3 is a vertical sectional side view including a partially enlarged portion.

FIG. 4 is a horizontal sectional view.

FIG. 5 is a plan view during non-loading.

FIG. 6 is a plan view during loading.

FIG. 7 is an exploded perspective view showing a conventional example.

FIG. 8 is an exploded perspective view showing another conventional example.

FIG. 9 is a perspective view showing still another conventional example.

[Explanation of symbols]

 14 Cartridge main body 14d Open window 15 Shutter 17 Disc insertion slot 19c Door member

Claims (1)

(57) [Claims] 1. A shutter having a U-shaped cross section for opening and closing the opening window is provided at one end of a cartridge body comprising a hard case member having an opening window so as to be movable along the one end. in the disk cartridge, one end of the disk insertion opening for loading and unloading the exposed type disc to the other side end located on opposite sides formed to one side edge, the door member for closing the disc insertion opening openably of the cartridge body A pivot point is formed on the car, and this pivot point is
Holds the door by closing it with the cartridge body
Locking means for holding the door in the state with the door member and the cartridge.
A disk cartridge formed on the main body .