JPH0562332A - Magnetic recording device - Google Patents

Abstract

(57) [Summary] [Purpose] To enable reading and writing when a floppy disk is rotated at high speed or at low speed. [Structure] A head holder 22 is provided with a magnetic head for reading and writing on a disk 21, and the head holder 22 is moved up and down by a head lifting lever 11. When the lever 16 driven by the lever 11 pushes down the slide member 5 of the disk 21, the floppy disk becomes a high speed rotation type. Also, the rod 16c is the switch 2
Press 0 to rotate the floppy at high speed. [Effect] For a magnetic disk cartridge compatible with high-speed rotation, this is switched to a high-speed compatible read / write operation. Further, with respect to a conventional magnetic disk cartridge that does not support high-speed rotation, reading and writing are performed under the same conditions as the conventional one.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording device used as an external storage device of an electronic computer, and more particularly to a magnetic recording device capable of high speed recording / reproducing.

[0002]

2. Description of the Related Art Magnetic disk cartridges called floppy disks are widely used for external storage of electronic computers. As shown in FIG. 5, the disk-shaped flexible magnetic recording medium 3 is housed in a hard case called shells 1a and 1b. In order to remove dust adhering to the magnetic recording medium, the inner surface of the shell is removed. The fibrous sheets called liners 2a and 2b are provided in a portion facing the magnetic recording medium, and a plate called a lifter 4 is provided to press the liners 2a and 2b against the magnetic recording medium 3.

A conventional floppy disk is 300 times per minute.
The medium was rotated at the speed of rotation to read and write information, but in recent years, the rotation speed has been increased to 3,600 rpm,
Attempts have been made to improve the processing speed.

[0004]

However, when the conventional floppy disk is rotated at a high speed, the friction between the liner and the medium causes scratches, which deteriorates the durability of the medium. This problem can be solved by using a floppy disk with an improved liner part so that reading and writing can be performed at high speed, but the problem of damaging the floppy disk and drive if a conventional floppy disk is inserted incorrectly was there.

[0005]

A magnetic recording apparatus according to the present invention comprises an exchangeable disc-shaped magnetic recording medium, a drive device for rotating the magnetic recording medium, and a magnetic head for reading and writing information from the magnetic recording medium. In a magnetic recording device having
It is characterized in that a detecting means for detecting whether or not the magnetic recording medium is compatible with high speed rotation, and a switching means for switching the number of rotations of the magnetic recording medium according to the detection result are provided.

To detect whether or not the magnetic recording medium is compatible with high-speed rotation, it is preferable to press a part of the magnetic recording medium and detect the amount of pushing. A magnetic disk cartridge compatible with high-speed rotation switches between high-speed rotation and low-speed rotation by being pushed in. Further, if the pushing device is driven by using the power source already provided in the drive for moving the head, the present invention can be implemented by adding only a few parts.

[0007]

The problem of using a floppy disk at high speed is mainly caused by friction between the liner and the magnetic recording medium. The liner contacts the magnetic recording medium by being pushed up by the lifter. Therefore, the contact between the liner and the magnetic recording medium can be prevented by pushing down the lifter from the outside during high-speed rotation.

The "high-speed rotation-compatible magnetic disk cartridge" having such a mechanism has a liner and a magnetic recording medium in contact with each other when the lifter cannot be pressed down, like the conventional disk cartridge. Even if a conventional floppy disk device that does not have a disk is used, the same reading and writing as a conventional disk cartridge can be performed.

The magnetic recording apparatus of the present invention is provided with a mechanism for pushing down the lifter, for example. If this lifter drops normally, read and write at high speed. When the conventional magnetic disk cartridge is inserted, the lifter pressing device hits the shell, and thus the lifter pressing down fails. Therefore, whether or not the magnetic disk cartridge is compatible with high-speed rotation is identified by the moving distance of the lifter depressing lever.

When a magnetic disk cartridge compatible with high speed rotation is inserted, the rotation speed of the spindle motor for rotating the magnetic recording medium is set to a high speed. Further, the head signal processing circuit is set to process a high frequency signal.

When it is detected that the inserted magnetic disk cartridge does not support high speed rotation, the rotation speed of the spindle motor and the head signal processing circuit are set to the same conditions as those of the conventional floppy disk drive,
Read and write.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 3 and 4 are used in a magnetic recording apparatus of the present invention.
FIG. 2 shows a magnetic disk cartridge for high-speed rotation, and FIG. 2 shows the shell, the liner, the lifter (the part indicated by the dotted line is below the liner), and the slide member for pushing down the lifter. FIG. 3 is a detailed sectional view of the lifter portion.

The magnetic recording medium 3 is housed inside hard shells 1a, 1b made of synthetic resin. Liners 2a and 2b made of non-woven fabric are attached inside the shells 1a and 1b by partial adhesion. A part of the liner is pushed up by the lifter 4 to wipe off dust on the magnetic recording medium.

The lifter 4 is formed of an elastic resin plate and pushes the liner upward by the elasticity of the lifter itself. The lifter 4 has a protrusion 4 a extending outside the outer circumference of the magnetic recording medium 3. Shell 1a
A through hole 6 is provided at a position corresponding to the protruding portion 4a. A member 5 that slides in the vertical direction in FIG. 2 is fitted into the through hole 6 to prevent dust from entering through the through hole 6.

When the lifter 4 is not pushed down through the slide member 5, the magnetic disk cartridge of this embodiment functions similarly to the conventional magnetic disk cartridge. When the slide member 5 is pushed by the lever 16 described later and the lifter 4 is pushed down, the liners 2a, 2
b and the magnetic recording medium 3 are brought into non-contact with each other, and high-speed reading / writing becomes possible.

FIGS. 1 and 2 show an embodiment of the present invention, and show a portion of a lifter depressing device interlocking with a head up-and-down mechanism. In addition, FIG. 1 shows the disk 2
1 is a front view facing 1 and FIG. 2 is a view on arrow II of FIG. 1.

The head push-up lever 11 is pushed up at the position shown by (x) in the figure when the disc is not inserted, and pushes up the upper magnetic head holder 22. That is, the head push-up lever 11 is pivotally supported by the pin 12 with respect to the base frame 28 and is pushed up from the push-up shaft 29. The protrusion 22 a of the head holder 22 is locked to the head push-up lever 11. The spring 13 wound around the pin 12 biases the operating end 11a side of the lever 11 in a downward direction, and when the push-up shaft 29 is retracted to release the push-up force, the spring 23 causes the head push-up lever to be released. 11 rotates in a direction to release the push-up of the head.

Magnetic heads for reading and writing on the disk 21 are attached to the tip ends of the upper head holder 22 and the lower head holder (not shown).
The base end side of the head holder 22 is attached to the base 27 via the elastic plate 23, and the tip end side of the head holder 22 is vertically movable in the direction perpendicular to the paper surface of FIG. The base 27 is advanced and retracted in the radial direction of the disk 21 by the motor 26 and the ball screw 25. A force for lowering the head is applied to the head holder 22 by a spring 24. For this reason, when the head push-up by the head push-up lever 11 is released, the head moves downward and contacts the disk 21. The head push-up lever 11 is configured to be gradually lowered by the damper 14 and the cam 15.

The above is the mechanism for moving the head up and down, which is provided in the conventional magnetic disk drive. The device of the present invention is realized by adding a small number of parts to the head up-and-down mechanism.

A magnetic disk cartridge compatible with high speed rotation is provided with a push-in portion at a position indicated by (z) in the figure for disc identification and rotation speed switching. That is, by pressing this part from the outside, the magnetic disk cartridge switches to withstand high-speed rotation,
Further, whether or not this portion can be pushed in is identified as to whether or not the magnetic disk cartridge is compatible with high-speed rotation.

The device shown in FIG. 1 pushes this part by means of the actuating end 16b of the lever 16. Lever 16 is pin 18
Is rotatably supported by the spring, and a force is applied by the spring 19 in a direction to push down the lever 16.
When the magnetic disk cartridge is not inserted, that is, when the head is raised, the root portion 16a of the lever 16 is the root portion 1 of the head lifting lever 11.
It is pushed by 1b, and the lever 16 is raised. When the magnetic disk cartridge is inserted and the head moves down, the lever 16 also starts moving down.

If the inserted disk cartridge is compatible with high speed rotation, the operating end 16 of the lever 16
a press the switch button of the disc 21
To a state compatible with high-speed rotation. If the button is pushed in successfully, the lever is lowered, and the rod portion 16c provided on the lever 16 pushes the detection switch 20 to inform the drive that the magnetic disk cartridge compatible with high-speed rotation has been inserted.

If the inserted disk cartridge is a conventional magnetic disk cartridge that does not support high-speed rotation, the lever 16 corresponds to the case of the cartridge and stops halfway. In this case, since the lever 16 does not press the detection switch 20, it can be determined that a normal disk cartridge has been inserted.

The drive uses the signal from the detection switch to
The rotation speed of the spindle motor is switched, the time constant of the filter of the head signal processing circuit is switched, and the information transmission speed is switched.

[0025]

As is apparent from the above embodiments, the magnetic recording apparatus of the present invention can be realized by adding a small number of parts as compared with the conventional apparatus, and is excellent as follows. Have the effect.

First, the magnetic recording apparatus of the present invention switches a magnetic disk cartridge compatible with high-speed rotation to a high-speed compatible read / write operation. Further, with respect to a conventional magnetic disk cartridge that does not support high-speed rotation, reading and writing are performed under the same conditions as the conventional one.

The floppy disk drive is already widely used. When introducing new products, compatibility with conventional products becomes the biggest issue. The magnetic recording apparatus of the present invention can read and write a magnetic disk cartridge compatible with high-speed rotation at a speed ten times or more faster than that of a conventional magnetic disk cartridge, and can also read and write a conventional magnetic disk cartridge under the same conditions as the conventional one.

Therefore, the user does not need to be aware of the type of the disk cartridge or the type of the magnetic recording device, and the conventional magnetic recording device or the magnetic disc cartridge, the high speed rotation type magnetic recording device and the high speed rotation compatible magnetic disc cartridge. Can be mixed. In any combination of magnetic recording device and magnetic disk cartridge,
Reading and writing can be performed normally, and high-speed reading and writing are performed only when a high-speed rotation type magnetic recording device and a magnetic disk cartridge compatible with high-speed rotation are combined.

[Brief description of drawings]

FIG. 1 is a front view of a magnetic recording device according to an example.

FIG. 2 is a view on arrow II of FIG.

FIG. 3 is a plan view showing an internal configuration of a floppy disk.

FIG. 4 is an enlarged cross-sectional view showing a configuration of a slide member 5 portion in FIG.

FIG. 5 is an exploded perspective view of a floppy disk.

[Explanation of symbols]

 1a, 1b Shell 3 Flexible magnetic recording medium 4 Lifter 5 Slide member 11 Head pushing lever 12 Pin 13 Spring 16 Lever 20 Detection switch 22 Head holder

Claims (4)

[Claims] 1. A magnetic recording device having a replaceable disk-shaped magnetic recording medium, a drive device for rotating the magnetic recording medium, and a magnetic head for reading and writing information from the magnetic recording medium, the magnetic recording device being capable of high-speed rotation. A magnetic recording apparatus comprising: a detection unit that detects whether or not the medium is a recording medium; and a switching unit that switches the rotation speed of the magnetic recording medium according to the detection result. 2. The magnetic recording device according to claim 1, wherein
The magnetic recording medium has a pushing means for pushing a part of the magnetic recording medium, and the detecting means detects whether or not the pushing amount of the pushing means is to detect whether or not the magnetic recording medium is compatible with high-speed rotation. And a magnetic recording device. 3. The magnetic recording device according to claim 2,
A magnetic recording apparatus, wherein the magnetic recording medium is switched to a high-speed rotation compatible magnetic recording medium by pressing a part thereof. 4. The magnetic recording apparatus according to claim 2 or 3, wherein the pushing means for pushing a part of the magnetic recording medium is driven by a power source for moving the magnetic head toward and away from the magnetic recording medium. A magnetic recording device characterized by being driven.