JP2937669B2 - Disk unit - 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 drive in which a cartridge having windows for exposing a disk formed on both sides thereof is loaded, and in particular, dust or the like enters the inside of the cartridge through a window on an unused side. The present invention relates to a disk device that prevents such a situation.

[0002]

2. Description of the Related Art Recently, a disk capable of recording and reproduction using a magneto-optical system or the like has been used, and such a disk is generally used by being housed in a cartridge. Further, this type of disc includes a disc for both recording and reproduction, and a disc for reproduction only in which software such as music is already recorded. 3A and 3B show the appearance of a cartridge storing a read-only disc, and FIG.
(B) is a back view. FIG. 4 shows the appearance of a cartridge containing a disk for both recording and reproduction, and FIG.
Is a plan view, and (B) is a back view.

In the reproduction-only type shown in FIGS. 3A and 3B, when the shutter S provided on the cartridge Ca slides in the direction of the arrow, the window 2 opens on the back surface C2. On the other hand, no window is formed on the surface C1 of the cartridge Ca, and the portion of the surface C1 is a display space for displaying the recorded software content. In the read-only disk device in which the cartridge Ca is loaded, the optical head faces the window 2 opened by opening the shutter S, and information is reproduced by laser light emitted from the optical head to the disk.

In the recording / playback type shown in FIGS. 4A and 4B, when the shutter S provided on the cartridge Cb slides in the direction of the arrow, the window 1 opens on the front surface C1 and the window also opens on the back surface C2. 2 opens. In the disk device in which the recording / playback type cartridge Cb is loaded, the optical head faces the window 2 which is opened by opening the shutter S, and the magnetic head faces the window 1. The recording surface of the disk is heated by the laser beam and the magnetic field is modulated by the magnetic head to perform writing.
At the time of reproduction, recorded information is read by reflected return light of laser light emitted from the optical head.

[0005]

There are two types of disk devices in which this type of disk is loaded, those that can record and reproduce data, and those that are only used for reproduction. Is common. When the recording / playback cartridge Cb is loaded into such a playback-only disk device, the following problem occurs. FIG. 5 is a plan view showing a state in which a recording / playback cartridge is loaded in a read-only disk device, and FIG. 6 is a sectional view taken along the line VI-VI in FIG.

In this read-only disk device, a turntable 4 on which a clamp 6 at the center of the disk in a loaded cartridge is mounted, a spindle motor 3 for driving the turntable 4, and a state in which a shutter S is opened. An optical head H facing the recording surface of the disk D via the window 2 is provided. When the recording / playback cartridge Cb is loaded and the disc is loaded on the turntable 4, in this state, the shutter S is already opened, and the shutter S remains open while the cartridge continues to be loaded. is there. In addition, for example, in the case of an in-vehicle disk device, for example, the reproduction is not performed, and the cartridge is often left for a long time with the cartridge loaded in the disk device.

In this case, the window 1 on the upper surface side of the cartridge Cb continues to be opened, so that the dust DS easily adheres to the upper surface of the disk D. When the amount of the dust and the like becomes large, when the same cartridge Cb is loaded into a recording / reproducing disk device and recording is to be performed, the dust is transferred to a magnetic head facing the upper surface of the disk D, Problems such as a decrease in magnetic modulation capability occur.

Accordingly, the present invention provides a disk drive in which a cartridge having windows formed on both front and back sides is loaded, wherein dust or the like can be prevented from entering the cartridge from an unused window. It is intended to provide.

[0009]

According to the present invention, a cartridge having windows formed on both front and rear sides for exposing a disk housed therein to the outside is loaded, and a signal is recorded on the disk at the loading position. Or, a disk device having a head for reproduction, wherein a closing member for covering a window of the cartridge on a side where the head does not act on a disk is provided.

[0010]

According to the above-mentioned means, when a window is formed on both front and back surfaces of a cartridge, such as a magneto-optical recording type disk for both recording and reproduction, and the disk is exposed at that portion, only one window of the cartridge is used. When used, a closing member that closes the window of the cartridge on the unused side is provided, such as when the reproduction operation is interrupted,
It is possible to prevent dust and the like from entering the cartridge from the window.

[0011]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a state in which a recording / playback cartridge is loaded in a disk device according to the present invention, and FIG. 2 is a sectional view taken along the line II-II of FIG. This disk device is for reproduction only, for example, for use in a vehicle, and is shown in FIG.
FIG. 4B shows a cartridge Ca for reproduction only shown in FIG.
A cartridge C for both recording and reproduction shown in FIGS.
b can be commonly loaded. The spindle motor 3 and the spindle motor 3
And a turntable 4 which is mounted on and driven by a shaft, and an optical head H for reproduction facing the disk is provided to be driven in the horizontal direction in the figure.

When the cartridge Ca for reproduction only shown in FIG. 3 or the cartridge Cb for both recording and reproduction shown in FIG. 4 is loaded, the cartridge is guided into the apparatus by a loading mechanism.
The shutter S is slid to open the window 2 on the back surface C2 of the cartridge Ca for reproduction only, and open the windows 1 and 2 on the front surface C1 and back surface C2 of the cartridge Cb for both recording and reproduction. Be released.
Then, with the shutter S opened, the clamp portion 6 is guided to the position of the turntable 4 and appears in the circular window C3 in the center of the back surface C2 of the cartridge Ca or Cb.
Are magnetically attracted to the turntable 4 and fitted. At this time, the shutter S is kept open, and the optical head H for reproduction faces the disk D exposed from the window 2 on the back surface of the cartridge.

In the disk drive shown in FIG.
A closing plate 7 is provided at a position opposed to. The closing plate 7 is rotatably supported by a shaft 9 and is urged by a spring 8 in a counterclockwise direction in FIG. As shown in FIG. 4 (A), on the surface C1 of the recording / reproducing cartridge Cb, a portion where the shutter S slides is a concave portion 1a, and when the shutter S is opened, the window 1 is formed in the concave portion 1a. appear. As shown in FIGS. 1 and 2, when the cartridge Cb for both recording and reproduction is loaded and the closing plate 7 is rotated clockwise, the closing plate 7 fits into the concave portion 1a, With the closing plate 7,
The window 1 can be completely sealed.

A solenoid mechanism 12 is provided below the closing plate 7, and its plunger 12 a and the closing plate 7 are connected by a spring 11. here,
The tension of the spring 11 is set to be stronger than the tension of the spring 8. When the solenoid mechanism 12 is not excited, the closing plate 7 is rotated counterclockwise by the elastic force of the spring 8 as shown by the solid line in FIG. 2, but the solenoid mechanism 12 is excited,
When the plunger 12a is sucked, the closing plate 7 is pulled clockwise through the spring 11, and is brought into a chain line state in FIG. The solenoid mechanism 12 is energized by a drive circuit 13, and the drive circuit 13 is controlled by a control circuit 14, which is a control center of the entire disk drive. Further, an optical sensor 15 for detecting a type detection hole of a cartridge to be loaded is provided in the disk device, and a detection output of the optical sensor 15 is detected by a detection circuit 16 and A / D converted. It is provided to the control circuit 14.

As shown in FIGS. 3 (B) and 4 (B), a type detection hole SA is provided on the back surface C2 of the cartridge. The control circuit 14 can recognize whether the cartridge Ca for reproduction only is loaded or the cartridge Cb for both recording and reproduction is loaded.

Next, the operation will be described. When the cartridge is inserted into the insertion slot of the disk device, the cartridge is loaded into a position shown in FIG. 2 by a loading mechanism (not shown), and the clamp portion 6 at the center of the disk D is fitted to the turntable 4 by magnetic adsorption or the like. You. Further, when guided by the loading mechanism, the shutter S of the cartridge is slid. Therefore, as shown in FIG. 2, when the cartridge is loaded, the shutter S is maintained in a state where the shutter S is already slid, and the cartridge C
The window 2 on the back C2 is opened, and the windows 1 and 2 on both the front and back are opened in the cartridge Cb for both recording and reproduction.

When a cartridge is loaded, the detection output of the optical sensor 15 is detected by a detection circuit 16 and A
/ D converted and applied to the control circuit 14. Control circuit 1
In 4, it is recognized from the detection output whether the loaded device is for playback only or for both recording and playback.
If the loaded cartridge Ca is a read-only cartridge, no command is issued to the drive circuit 13 and the solenoid mechanism 1
2, the closing plate 7 is separated from the cartridge Ca by the pulling force of the spring 8 as shown by the solid line in FIG.

When it is determined that the loaded cartridge Cb is for both recording and reproduction, the control circuit 1
4 issues a command to the drive circuit 13 and the solenoid mechanism 1
2, the plunger 12 a is attracted by the excitation of the solenoid mechanism 12, and the closing plate 7 is pulled via the spring 11. Then, as shown by a chain line in FIG. 2, the window 1 on the upper surface of the cartridge is closed by the closing plate 7. Since the closing plate 7 is elastically pulled by the force of the spring 11, and the closing plate 7 has an area that fits into the recess 1a in which the window 1 is formed, the window 1 is securely closed. Even when the cartridge is still loaded in the disk device without performing the above operation, dust and the like do not enter the inside of the cartridge from the window 1. Then, for example, when an eject operation for removing the cartridge is performed,
When the energization of the solenoid mechanism 12 is cut off, the closing plate 7 rotates upward by the pulling force of the spring 8, and the closing plate 7 separates from the cartridge Cb. And the cartridge Cb
Is discharged by the loading mechanism.

In the above embodiment, the window 1 is always closed by the closing plate 7 while the recording / reproducing cartridge Cb is loaded, but the closing plate 7 is driven in the closing direction. Various timings can be handled by the control circuit 14. For example, in the read-only disk device shown in FIG. 2, when the cartridge Cb for both recording and reproduction is loaded and the reproduction operation is directly performed, the closing plate 7 is not immediately lowered, and the reproduction operation is interrupted for a certain period of time. Only when it is maintained in the loaded state, the solenoid 12
May be driven to close the window 1 on the upper surface by the closing plate 7. In this method, only when the regeneration is interrupted, the closing plate 7
Is lowered and the lowering force of the closing plate 7 does not act on the cartridge Cb during the reproducing operation. Therefore, it is possible to prevent the sliding resistance between the disc and the inner surface of the cartridge from increasing due to the bending of the cartridge Cb during the reproducing operation. it can.

In addition, in the read-only disk device shown in FIG. 2, when the cartridge Ca or Cb is loaded at the position of the turntable 4 regardless of the type of the cartridge, the solenoid mechanism 1
2 may be driven to lower the closing plate 7.
In this method, when the loaded cartridge Cb for both recording and reproduction is used, the window 1 on the upper surface is immediately closed by the closing plate 7 as shown in FIG. In the case of the cartridge Ca, since the one corresponding to the window 1 is not originally open, the closing plate 7 merely rides on the upper surface of the cartridge Ca by the elastic force of the spring 11.

Further, the present invention is not limited to a read-only disk device, but can also be implemented in a recording / playback disk device. That is, the closing plate 7 can be lifted to a position where it does not interfere with the recording magnetic head, and when the recording / playback cartridge is loaded and the recording mode is set, the closing plate 7 is moved from the cartridge Cb. Then, the magnetic head for modulation can face the window 1. When a read / write cartridge is loaded and a reproducing operation is performed, the magnetic head may be retracted to a position outside the window 1 and the window 1 may be closed by the closing plate 7.

[0022]

As described above, according to the present invention, when a disk having windows formed on both front and rear surfaces such as a recording / reproducing disk is used, the heads do not face each other. Since the closing member for closing the window is provided, it is possible to prevent dust from entering the cartridge from an unused window.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state where a cartridge is loaded in a disk device according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

3A and 3B show a read-only cartridge, wherein FIG. 3A is a plan view and FIG. 3B is a rear view.

FIG. 4 shows a cartridge for both recording and reproduction, and (A)
Is a plan view, and (B) is a back view.

FIG. 5 is a plan view showing a state where a cartridge is loaded in a conventional disk device.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 5;

[Explanation of symbols]

 Ca cartridge for reproduction only Cb cartridge for both recording and reproduction D disk 1 recording window 2 reproduction window 3 spindle motor 4 turntable 6 clamp 7 closing plate 8 spring 11 spring 12 solenoid mechanism

Claims (1)

(57) [Claims] 1. A head for loading a cartridge having windows formed on both sides thereof for exposing a disk housed inside to the outside, and recording or reproducing signals on the disk at the loading position. And a closing member for covering a window of the cartridge on a side where the head does not act on the disk.