JPH0437497B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floppy disk device or a similar disk device, and more particularly to a disk device having an electrical eject mechanism.

[Conventional technology]

In a magnetic disk device using a 3.5-inch floppy disk, generally called a microfloppy disk, it has already been proposed to electrically eject the floppy disk using a motor or a plunger solenoid.

[Problem that the invention seeks to solve]

By the way, when ejecting is performed electrically, there is a high possibility that an erroneous ejecting operation will be performed. For this reason, it has conventionally been necessary to provide a door lock (ejection lock) mechanism using a plunger solenoid or the like to prevent accidental ejection. Providing an independent ejection lock mechanism in this way hinders the miniaturization and reduction of power consumption of the disk device.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disk device that can easily prevent erroneous ejection.

[Means for solving problems]

To achieve the above object, the present invention includes: a turntable for rotating a recording medium disk; a disk motor for rotating the turntable; a signal conversion head for converting data in relation to the disk; It has a tunnel erase gap for erasing both sides of the track formed by the signal conversion head, and this tunnel erase gap is located a certain distance behind the signal conversion gap of the signal conversion head in the scanning direction. a tunnel erase head disposed in the disk, and a head moving device for moving the signal conversion head and the tunnel erase head in a direction across tracks of the disk;
A write circuit including a write gate for selectively flowing a current corresponding to write data to the signal conversion head and connected to the signal conversion head, and a write gate signal for controlling the write gate. a write gate signal supply circuit for supplying a write gate signal, and a write gate signal supply circuit connected between the write gate signal supply circuit and the tunnel erase head;
an erase control circuit that applies a delay corresponding to the interval between the signal conversion gap and the tunnel erase gap to the write gate signal to form an erase gate signal indicating an erase period; and a mounting state of the disk on the rotary table. an eject mechanism for releasing the disk and putting the disk into an eject state; an eject signal generating circuit for generating an eject signal for instructing the eject state; and an electrical eject mechanism for operating the eject mechanism in response to the eject signal. connected between a drive device, the eject signal generation circuit, and the eject drive device, and in response to the erase gate signal obtained from the erase control circuit, when the erase gate signal permits erasing. The present invention relates to a disk device having an eject prohibition control circuit that prohibits eject.

[Effect]

The eject inhibit control circuit in the present invention is responsive to the erase gate signal. Therefore, the eject operation is not started in synchronization with the end of the period indicating write of the write gate signal, but is allowed to eject in synchronization with the end of the period indicating erasing of the erase gate signal. In this way, by delaying the eject with respect to the write gate signal, it becomes possible to tunnel erase to the end of the track recorded in the signal conversion gap.

〔Example〕

Next, a floppy disk device according to an embodiment of the present invention shown in FIG. 1 will be explained.

The disk device shown in Fig. 1 is, for example,
Data is written and read using the micro floppy disk (3.5 inch disk) disclosed in Publication No. 117463,
Inside the container 1 of the disk device, there is a turntable 3 for rotating the flexible magnetic disk 2;
A disk motor 4 coupled to the disk 2, a tunnel erase type head 5 for writing data to and reading data from the disk 2, and a head for moving the head 5 in the cross-track direction (radial direction) of the disk 2. moving mechanism 6,
A disk cartridge moving mechanism 7 for obtaining the mounted state and the mounted state (eject state) of the disk 2, an electric eject drive device 8 for ejecting the disk cartridge moving mechanism 7, and various electric circuits. is provided.

The disk 2 is housed in a case 9 and constitutes a disk cartridge 10. In order to insert this cartridge 10 into the container 1, a front plate 11 of the container 1 is provided with an opening 12 for attaching and removing a disk cartridge. Disk cartridge 1
0 is carried as shown by arrows 13 and 14 by the disk cartridge moving mechanism 7, and is attached to and removed from the rotating table 3.
will be done.

The disk cartridge moving mechanism 7 functions as an ejection mechanism according to the present invention, and also functions as a disk loading mechanism.

The head moving mechanism 6 includes a head carriage 15.
and the lead screw 16 that is engaged with this.
and a stepping motor 17 coupled to this lead screw.

An eject drive device 8 connected to the disk cartridge moving mechanism 7 is composed of a plunger solenoid, and is configured to cause the disk cartridge moving mechanism 7 to eject due to its bias.

Reference numeral 19 denotes an eject signal generation circuit, which generates a low level eject signal by the eject operation switch of the disk device or the host side device. The eject signal generation circuit 19 has two
It is connected to an eject drive circuit 24 via a flip-flop 22 constituted by two NAND gates 20 and 21 and an AND gate 23.

The flip-flop 22 is for determining the eject drive period. This one NAND
The eject signal generation circuit 19 is connected to one input terminal of the gate 20, the disk sensor 25 is connected to one input terminal of the other NAND gate 27, and the output terminal of one NAND gate 20 is connected to the other NAND gate 27. 21, the output terminal of the other NAND gate 21 is connected to the other input terminal of one NAND gate 20, and the output terminal of one NAND gate 20 is connected to the AND gate via the NOT circuit 21a. It is connected to 23.

The disk sensor 25 is connected to the disk cartridge 1
The light emitting element 26 and the light receiving element 2 arranged in the path of 0
When the disk cartridge 10 is inserted into a predetermined position, the light emitting element 26 is blocked by the disk cartridge 10, and the light receiving element 2
When the output of 7 becomes high level and the ejection of the disk cartridge 10 is completed, the light emitting element 26
The light is incident on the light receiving element 27 and is configured to generate a low level output.

The eject drive circuit 24 is a flip-flop 2
This circuit supplies power to the eject drive device 8 only during the eject period in response to the output of the eject drive device 8.

A read/write circuit 28 is connected to the head 5 and includes a read circuit and a write circuit. Head 5 is a tunnel erase type head, so it has a read/write gap.
It consists of a write head and a tunnel erase head having an erase gap. In addition, lead/
The light gap and the erase gap have a constant spacing in the track direction. The write circuit portion of the read/write circuit 28 includes a known write gate (not shown) that allows a current corresponding to write data supplied from a line 29 to flow, and an erase gate (not shown) that controls an erase current. (not shown) is built-in. The read/write circuit 28 is exactly the same as that of a conventional floppy disk device and is well known, so a detailed explanation will be omitted.

The read/write circuit 28 receives a write gate signal 30 derived from the host device.
They are connected via NOT circuits 30a and 30c. Further, an erase control circuit 30b is connected to a branch line of the output of the NOT circuit 30a,
This output is connected to the read/write circuit 28 via the NOT circuit 30d. The erase gate control circuit 30b controls the read/write operation of the head 5.
The erase gate signal is generated by applying a delay corresponding to the interval between the write gap and the erase gap to the write gate signal.

The AND gate 23 constitutes an eject inhibition control circuit according to the present invention, the output of the flip-flop 22 is connected to the first input terminal of the AND gate 23 via the NOT circuit 21a, and the NOT circuit is connected to the second input terminal of the AND gate 23. 30c is connected, and a NOT circuit 30d is connected to the third input terminal.

2 to 5 show an example of the disk cartridge moving mechanism 7 shown in FIG. 1. FIG. Disk cartridge moving mechanism 7 shown here
Since this is basically the same as that disclosed in Japanese Patent Application Laid-open No. 117463/1983, detailed explanation will be omitted and only an outline will be given. This disk cartridge moving mechanism 7 is designed to guide the disk cartridge 10 in the directions of arrows 13 and 14 in FIG.
It has a cartridge holder 31 shown in FIG.
The disk cartridge 10 is manually inserted into the holder 31 from the direction of the arrow 32.
When the disk cartridge 10 is inserted to a predetermined position, the holder 31
It moves in the direction shown by arrow 14 in FIG. Four pins 33 are provided on the side surface of the holder 31 and are inserted into the vertical guide holes 35 of the guide plate 34 to which the holder 31 is fixed, so that the holder 31 can only move in the vertical direction shown by the arrow 14 in FIG. It is movable. The lever 36 in FIG. 3 is pivotally supported by the holder 31, biased counterclockwise in FIG. 2 by a torsion spring 37, and the lever 36 in FIG. (eject direction). However, when the disk cartridge 10 is mounted on the rotating table 3, ejection is prevented by a known disk cartridge positioning means (not shown).

A slider 38, shown in FIGS. 4 and 5, is provided to provide vertical movement of the holder 31, as indicated by arrow 14. This slider 38 has an arrow 39
It is guided by a pin 40 so as to be movable in the direction shown by , that is, the same direction as the direction in which the cartridge 10 is installed and removed. This side surface 41 is provided with an inclined groove 42, into which the pin 33 of the holder 31 is inserted. As a result, the slider 38 moves to the arrow 3 in FIG.
9. When the pin 33 moves in the direction of the arrow 43 in FIG. 5, a force is applied to the pin 33 to move the holder 31 in the direction of the arrow 44 in FIG. Slider 38 is biased downwardly in FIG. 4 by spring 45. Therefore, in the disk loading state, the slider 3
8 has shifted downward in Figure 4. An eject drive 8, consisting of a plunger solenoid, is connected to the slider 38 and pulls the slider 38 upwardly in FIG.

46 is a lock lever, which has a recessed portion 47;
It is biased counterclockwise by a spring 48. 4 shows the disc loading state, so the pin 49 of the slider 38 has come out of the recess. However, when the slider 38 is pulled upward by the drive device 8 in FIG. Entry lock is established. This unlocking is achieved by pressing the cartridge 10 against a rising pressure portion 50 provided on the lock lever 46.

〔motion〕

Next, the sixth graph showing the voltage waveforms at points A to F in FIG.
The operation of the apparatus shown in FIG. 1 will be explained with reference to the drawings.
If a high level (true) write gate signal is generated on the output line of the NOT circuit 30a from _t1 to _t4 as shown in FIG. 6A, the erase control circuit 30a
From 0b, the erase gate signal shown in FIG. 6B is generated at _t2 to _t5 , which is slightly delayed from the write gate signal. As described above, at _t3 when the write gate signal and the erase gate signal are in the write permission state (true), the eject switch in the eject signal generation circuit 19 is operated by mistake, and the eject signal becomes low level as shown in FIG. 6C. When the (eject trigger) occurs, in response, the output of the flip-flop 22 becomes a low level as shown in FIG. 6E. However, the inverted signals in Fig. 6 A and B are
Since it is input to the AND gate 23, the output of the AND gate 23 is prohibited from going high in response to the low level output for ejection control obtained from the flip-flop 22. Therefore, even if an eject signal is generated at _t3 , eject does not start. At t ₅ , both the signals A and B in FIG. 6 become low level, and conversely, the NOT circuit 30c,
When the outputs of both gates 30d become high level, the eject inhibition is canceled and the output of AND gate 23 becomes high level as shown in FIG. 6F. The eject drive circuit 24 operates the eject drive device 8 in response to the high level signal shown in FIG. 6F, and ejection is executed. Disk cartridge 1 at t ₆
When the ejection of 0 is completed, the output of the disk sensor 25 becomes low level as shown in FIG. 6D.
In response, the flip-flop 22 operates as shown in FIG.
As shown in FIG. 2, the output of the AND gate 23 becomes a low level, and the power supply to the eject drive device 8 is cut off.

After the _5th point of ejecting, the 6th
Since both the write gate signal in FIG. A and the erase gate signal in FIG. 6B are at low level, erroneous writing and unerased data will not occur.

[Modified example]

The invention is not limited to the embodiments described above, but can be modified. For example, in the above embodiment, the downward movement of the cartridge 10 in FIG. 2 is performed by the torsion spring 37, but as shown in FIG. By energizing this, the lever 36 may be turned counterclockwise in FIG. 7 and the cartridge 10 may be ejected. In this case, the plunger solenoid 51 is connected to the eject drive circuit 24 shown in FIG.

Further, instead of performing the ejecting operation using a plunger solenoid, a motor may be used and ejecting may be performed based on the angular movement of the motor.

Also, instead of using slider 38, a plunger solenoid or motor may be provided to move holder 31 in the direction of arrow 14 in FIG. Furthermore, the flip-flop 22 may be constructed from a D flip-flop. Further, the cartridge 10 is moved only in the direction of the arrow 13 in FIG.
may be moved in the direction of arrow 14 in FIG.
It is also applicable to a case where the rotary table is fixedly arranged, the disk cartridge is moved in the direction of arrow 13 in FIG. 1, and the disk is fixed with a clamper.

〔Effect of the invention〕

According to the present invention, erroneous ejection can be easily and reliably prevented.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a part of a disk device according to an embodiment of the present invention, FIG. 2 is a plan view showing a holder portion of a disk cartridge moving mechanism, and FIG. 3 is a side view showing a guide of the holder. Fig. 4 is a plan view of the slider portion, Fig. 5 is a side view showing the relationship between the holder and the slider, and Fig. 6 is A to F of Fig. 1.
FIG. 7 is a waveform diagram showing the state of the points, and a plan view showing a modified eject mechanism. 2... Disk, 3... Turntable, 4... Disk motor, 7... Disk cartridge moving mechanism, 8... Eject drive device, 10... Cart cartridge, 19... Eject signal supply circuit, 23
...AND gate, 24...Eject drive circuit,
25...Disk sensor, 28...Read/write circuit, 30...Write gate signal line.

Claims (1)

[Scope of Claims] 1. A turntable for rotating a recording medium disk, a disk motor for rotating the turntable, a signal conversion head for converting data in relation to the disk, and the signal conversion head. a tunnel erase gap for erasing both sides of the track formed by the head, and the tunnel erase gap is disposed a certain distance behind the signal conversion gap of the signal conversion head in the scanning direction. a head moving device that moves the signal conversion head and the tunnel erase head in a direction across tracks of the disk; and a write gate that selectively flows a current corresponding to write data to the signal conversion head. a write circuit including a write circuit and connected to the signal conversion head; a write gate signal supply circuit supplying a write gate signal for controlling the write gate; the write gate signal supply circuit and the tunnel erase head; an erase control circuit connected between the write gate signal and the write gate signal to form an erase gate signal indicating an erase period by applying a delay corresponding to the interval between the signal conversion gap and the tunnel erase gap to the write gate signal; an eject mechanism for releasing the mounting state of the disk on the rotary table and putting the disk in an eject state; an eject signal generating circuit for generating an eject signal for instructing the eject state; an electric eject drive device that operates the eject mechanism; and an electric eject drive device that is connected between the eject signal generation circuit and the eject drive device and that operates the erase gate signal in response to the erase gate signal obtained from the erase control circuit. A disk device comprising: an eject prohibition control circuit that prohibits eject when a gate signal permits erasing.