JPS61204860A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent rocking in the vertical direction of upper and lower heads and to suppress the resonance of a head supporting arm by attaching the first magnetic head to a carriage through a gimbals spring body of all directions and fixing the second magnetic head to a head supporting body without the gimbals. CONSTITUTION:A gimbals spring body 104 which has a number of degrees of interlocking in the radial direction and the peripheral direction of a double- face flexible magnetic disc 103 is attached to a carriage 101. The first magnetic head 105 is attached to the about center of the gimbals spring body 104. A head supporting body 107 is provided openably and closably on the carriage 101 by a spring body 106 consisting of a flat spring-shaped hinge. The second magnetic head 108 is fixed directly to the head supporting body 107. The second magnetic head 108 is fixed without gimbals having no degree of freedom of interlocking in the radial direction and the peripheral direction of the magnetic disc 103.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic recording and reproducing apparatus suitable for recording and reproducing a flexible double-sided magnetic disk.

[Background of the invention]

This type of device and L7, for example! Samurai Ko Showa 58-1
5866, etc., the lower head is fixed to the carriage without using a gimbal spring body to regulate the position and inclination of the reference surface of the magnetic disk, and the upper head is made of a plate spring hinge with respect to the carriage. By gimbally supporting a head support arm that is attached to a spring body so that it can be opened and closed, and pressing this head support arm against the lower head side with a screw spring, the ability of the upper and lower heads to follow the bending (Waviness) of the magnetic disk is improved. There are known things that can improve In this device, the upper head uses a gimbal spring body, a leaf spring hinge, and a torsion spring, so when the upper head is brought into contact with the magnetic disk surface by the head support arm, the magnetic When reading and writing data on a disk, parasitic vibrations generated in the gimbal spring cause the plate spring hinge, torsion spring, and head support arm to resonate, making recording and playback by the upper and lower heads unstable, and This has the problem of damaging the magnetic disk. This problem becomes more difficult as the recording density of the magnetic disk increases or as the thickness of the magnetic disk becomes thinner.
This is noticeable, and it becomes more compact due to higher density.
, is an extremely important issue that must be solved in order to realize a magnetic recording and reproducing device for FC magnetic disks.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems by preventing the upper and lower heads from swinging in the direction perpendicular to the reference plane of the magnetic disk, and by suppressing the resonance of the head support arm, thereby making the upper and lower heads flexible. It is an object of the present invention to provide a magnetic recording and reproducing device which is extremely suitable for recording and reproducing information on a high-density double-sided magnetic disk.

[Summary of the invention]

The gist of the present invention is to provide a carriage movably provided on one side of a rotating flexible double-sided magnetic disk in the radial direction of the magnetic disk, a first magnetic head attached to the carriage, and a first magnetic head attached to the carriage. a head support located on the other surface side and provided so as to be openable and closable with respect to the carriage, and facing the first magnetic head;
and a second magnetic head attached to the head support, and an elastic machine engaged with the head support to press the second magnetic head against the first magnetic head with a predetermined pressure via the magnetic disk. In the magnetic recording/reproducing apparatus, the first magnetic head is supported via an omnidirectional gimbal spring body supported at a point having a fixed positional relationship with respect to the carriage at a position where both magnetic heads face each other. , attached to the carriage, and a second
The magnetic head is non-gimbaled to the head support.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings.

1 and 2 show the basic structure of the present invention.

That is, a carriage 101 made of synthetic resin or a steel plate is movably provided on a guide shaft 100 mounted on the chassis using a driving source such as a stepping motor. A gimbal spring body 104 having a degree of freedom of movement in the radial and circumferential directions of the flexible double-sided magnetic disk 103 is attached to the carriage 101 by welding or adhesive.

A first magnetic head 105 is attached approximately at the center of the gimbal spring body 104 by adhesive or the like. A head support 107 is provided on the carriage 101 so that it can be opened and closed by a spring body 106 made of a leaf spring-like hinge. A second magnetic head 108 is directly fixed to the head support 107 by adhesive or the like. The second magnetic head 108 does not have a degree of freedom of movement in the radial direction and circumferential direction of the magnetic disk 103, and is fixed in a so-called non-gimbal manner.

A spring 109 made of a spring material is engaged with the head support 107 to press the second magnetic head 108 against the first magnetic head 105 via the magnetic disk 103 with a predetermined pressure. A bomb 109 is attached to the carriage 101.

Pivot 1 contacts the center of the back of gimbal spring body 104
10, it is formed integrally with the carriage 101.

The pivot 110 serves as a base point at which the first magnetic head 105 maintains a constant position with respect to the nominal plane of the magnetic disk 103.

According to the above configuration, the position of the nominal plane of the magnetic disk 103 can be regulated by the first magnetic head 105, and the inclination of the first magnetic head 105 can be regulated by the second magnetic head 108 without causing resonance. , since the first head 105 is attached to the gimbal spring body 104 with two degrees of freedom, both heads 105, 1 are attached to both sides of the magnetic disk 103.
08 has excellent followability.

FIGS. 3 to 8 show a specific embodiment of a magnetic recording/reproducing apparatus employing the present invention. The contents will be explained in detail above.

The chassis l of the magnetic recording/reproducing device is made of a steel plate. A support plate 2 for attaching the magnetic recording/reproducing device to a counterpart device such as a personal computer is fixed to the chassis 1 with screws or the like.

The front panel 3 is fixed to the front of the chassis l with screws or the like. The front panel 3 is provided with an opening 3a through which a cartridge 5 for a flexible double-sided magnetic disk 4 is inserted and removed.

The holder 6 made of a steel plate is supported by four support members 7 made of synthetic resin that are outsert at the ends of the chassis 1 so as to be able to move up and down. A guide groove 7a is formed in the support member 7. A roller 8 that engages with the guide groove 7a is provided at the side end of the holder 6.

The eject lever 9 made of a steel plate is movably installed on the chassis l. The coil spring 10 has one end fixed to a mounting piece 1a that is outsert to the chassis, and the other end fixed to a mounting piece 9a formed on the eject lever 9.

The elastic holding body 11 includes an L-shaped lever 11a, a coil spring llb, this coil spring 111), and the lever 11a.
and a mounting bin 11c for mounting the A
Ru. When the eject lever 9 is moved rearward and the locking bent portion lid formed on the lever 11a is engaged with the locking opening 9b provided on the eject lever 9, the engaged state is controlled by the elastic force of the coil spring llb. configured to be retained. When the lever 11a is rotated in a direction opposite to the elastic force of the coil spring llb, the engagement state is released, and the eject lever 9 is moved forward by the coil spring 10 to return to its original state.

When the cartridge 5 is inserted into the holder 6 through the opening 3a, the locking pin 13 provided on the lever 12 rotatably supported by the holder 6 is pulled against the elastic force of the holder 6. The chassis of the cartridge 5 (
1 (not shown) can be opened. Further, when the cartridge 5 is pushed into the holder 6, the cartridge 5
is brought into contact with the lever 11a, rotates about the locking pin 13 as a fulcrum, the engagement between the eject lever 9 and the lever 11a is released, and the coil spring lO causes the eject lever (-
9 is moved forward.

There are guide grooves 9 in the bent portions at both ends of the eject lever 9.
C is formed. This guide groove 9C allows the roller 8 provided on the holder 6 to descend along the guide groove 7a when the eject lever 9 moves forward. As the roller 8 descends along the guide groove 7a, the holder 6 descends, and the magnetic disk 4])
The pulley 4a is fixed to the chassis 1, or inserted into the pulley 16 of a magnetic disk drive 15 consisting of D and M.

A first magnetic head 1 that performs recording and reproduction on a magnetic disk 4
7 is 0.3 to 0.5 van on the first head support 18 made of a metal, for example, a stainless steel plate.
It is attached via a two-degree-of-freedom spring body 19 made of metal, such as stainless steel plate, with a diameter of 0.05 to 0.08. The second magnetic head 20 that performs recording and reproducing on the surface of the magnetic disk 4 opposite to the surface on which the first magnetic head 17 performs recording and reproducing is made of metal, such as stainless steel, and has a thickness of 0.3 to 0.5 m. A second head support body 2 made of a steel plate of
1 through a fixing plate 22 made of a stainless steel plate. Gimbal spring body 19 and fixed plate 22
are welded to the first head support 18 and the second head support 21, respectively.

The first head support body 18 is integrally formed with a connecting body 23 that largely protrudes laterally. In this embodiment, the first head support 18 and the connecting body 23 are formed by punching out a single stainless steel plate, but the invention is not limited to this. The first head support 18 and the connecting body 23 may be formed separately and then welded together.

Two guide members 26 made of metal rods are attached to the chassis 1 in parallel using outsert attachment pieces 1b, attachment fittings 24 made of a plate spring material, and attachment screws 25.

A carrier 27 made of synthetic resin is movably attached to the guide member 26 . The carrier 27 has a first head support 1B and a second head support 21 so as to sandwich the carrier 27.
can be installed. The mounting positions on both head supports 18 and 21 are set so that the first magnetic head 17 and the second magnetic head 20 face each other. The carrier 27 and the head support 18 constitute a carriage.

The second head support body 21 consists of a member 21a that supports the second magnetic head 20, and a spring body 21b that is made of a leaf spring-like hinge made of a metal body thinner than this member 21a. It is held so that it can swing upwards. The member 21a and the spring body 21b are integrated by caulking.

Bent pieces 2IC are formed at both ends of the second head support 21. The bent piece 21c extends outside a surface 21d of the second magnetic head 20 opposite to the mounting surface and in the longitudinal direction of the second head support 21.

The chassis 1 is provided with a drive device 28 that positions the first magnetic head 17 and the second magnetic head 20. The drive device 28 includes a motor 28a such as a stepping motor, a screw 28b that is rotated forward and backward by the motor 28a, and a mounting plate 28C for screwing the motor 28a to the chassis 1.

The screw 28b and the connecting body 2 are connected so that the connecting body 23 moves on the screw 28b when the screw 28b rotates.
3 is directly connected by a screw nut (28d).

Bent pieces 18a are formed at both ends of the first head support 18. The bent piece 18a extends outside the surface of the second magnetic head 17 opposite to the mounting surface 18b and in the longitudinal direction of the first head support 18.

First head support 18, carrier 27, and second head support 2
1 are integrated by fasteners consisting of screws 29.

The carrier 27 is provided with a through hole 27a into which the screw 29 is fitted, and a metal distance piece 30 is inserted into the through hole 27a.
Provided by insert molding or press fitting.

The ammunition 31 has the first magnetic head 17 and the second magnetic head 2.
It has a function of pressing the second head support in the direction of pressing 0. The ammunition machine 31 requires at least a coil spring tQ31a and a steel plate mounting member 31b to which the coil spring 31a is attached. Mounting member 31
b is fixed onto the carrier mounting member 21b of the second head support 21 using screws 29. The mounting member 31b includes an interlock adjustment member 32a for the position sensor 32.
A member 31c for attaching ' is integrally formed. The position sensor 32 defines and detects the initial position of the carrier 27.

The second head support 21 has a
an arm body 33 used for swinging the second arm upward;
A terminal block 35 is provided for electrically connecting a flexible cord 34 connected to the magnetic head 20. The arm body 33 and the terminal block 35 are integrally molded from a synthetic resin with excellent electrical insulation properties.

The mounting position of the arm body 33 and the mounting position of the coil spring 31a of the ammunition machine 31 are arranged substantially in a straight line with respect to a direction perpendicular to the longitudinal direction of the second head support body 21.

Flexible cord 3 connected to first magnetic head 17
6 has a head cord 37, and the flexible cord 34 connected to the second magnetic head 20 has a head cord 38.
are electrically connected to each other.

The tension spring 39 has one end attached to the notch 23a of the connecting body 23, and the other end attached to the attachment piece 1c outsert to the chassis l. The connecting body 23 and the first head support 18 are always pulled in a predetermined direction by a tension spring 39.

The front panel 3 is provided with an opening 3b through which a knob 4o made of synthetic resin for operating the eject lever 9 enters and exits. The knob 4o is fixed to the front end of the eject lever 9 with a screw or the like.

The position sensor 32 is fixed to the chassis 1 with screws 41. The mounting plate 28C of the drive device 28 has screws 4
2 and a screw hole 42a.

The first head support 18 has a mounting hole 27 provided at the front end of the carrier 27 so that it does not rotate relative to the carrier 27.
bf: is used and fastened to the carrier 27 by screws 43. The carrier 27 has a through hole 2 into which the guide member 26 fits.
7C is provided.

A pivot 18C that abuts the center portion of the gimbal spring body 19 is integrally formed on the first head support body 18. The second head support body 21 includes a coil spring 3 of the ammunition 31.
A cylindrical portion 21f for attaching the lower end of 1a and an opening 21g into which the terminal block 35 fits are formed. Bullet machine 31
The mounting member 31b is formed with a cylindrical portion 31d that allows access to the upper end of the coil spring 31a of the bullet 31,
Ru.

The chassis l has four parts 1d into which the lower end portion of the carrier 27 is fitted.
is provided. The size of the four parts 1d is such that even if the companion body 27 moves on the guide member 26, the carrier 27 does not fit on the edge of the recessed part 1d.
It is set so that there is no collision.

A printed circuit board (not shown) is disposed on the back surface of the chassis 1. Holes 1e and 1f are provided in the chassis 1 for connection with electrical components mounted on this printed circuit board. The hole 1e is used for fitting the connector for the head cord 37, 38. Hole lf is used to connect terminal pin 32a of position sensor 32 to an electrical component.

An automatic eject mechanism 4 is located at the rear end of the eject lever 9.
4 is provided. Cartridge 5 is in holder 6.
Guide leaf springs 45, 45a and leaf springs 46, 46a that come into contact with the cartridge 5 set in the holder 6 and press the cartridge 5 in a predetermined direction are provided.

A cover 47 made of a steel plate is provided above the holder 6. The positioning protrusion 1g of the cover 47 is outsert to the chassis 1. A deformation prevention pin 48 made of a screw or the like is provided in the center of the cover 47. The deformation prevention pin 48 comes into contact with the holder 6 to prevent the force bar 47 from being permanently deformed when a strong force is applied to the cover 47 and the cover 47 is slightly bent.

The holder 6 is provided with an opening 6a into which the second head support 21 fits, an escape hole 6b for preventing the temperature of the magnetic disk 4 from rising, and an arm 33f: an operating body 6c for operation. A bent lip 6d is formed at the edge of the opening 6a. The bent ribs 6d improve the strength of the holder 6 and provide an electrical and magnetic shielding effect (f-shrinking) for the second magnetic head 20.

A shutter 49 is provided in the opening 3a of the front panel 3. When the cartridge 5 is almost completely attached to the holder 6, the shutter 49 closes to prevent dust from entering the holder 6 through the opening 3a.

The second head support body 21 is provided with a notch 21n for positioning the arm body 33. Four relief portions lh and a relief hole 11 are formed in the mounting portion of the Shaan 1 (IJ) motor 28a. A pin 33a is integrally formed on the arm body 33.

Head cord 38 using bottle 33a and arm body 33 for OIJ
A cord stop is formed.

In the above configuration, normally the operating body 6C of the holder 6
The arm body 33 is lifted by the arm 33, the second head support body 21 is swung upward, and the first magnetic head 17
This prevents the second magnetic head 2o from colliding with the second magnetic head 2o.

When the cartridge 5 is inserted into the holder 6 through the opening 3a of the front panel 3 and the rear end of the cartridge 5 collides with the lever 11a, the lever 11a and the eject lever 9 are disengaged and the coil spring 10 is released. Since the eject lever 9 is moved forward, the entire holder 6 is lowered by the action of the guide groove 9c and the roller 8.

When the holder 6 is lowered, the hub 4a of the magnetic disk 4 is mounted on the hub receiver 16, and the first magnetic disk 17 and the second magnetic disk 20 are brought into contact with the magnetic disk 4. In this state, when the motor 28a is driven and the lead screw 28b is rotated, the connecting body 2
As the screw nut 28d held at C.3 moves on the lead screw C19) 28b, the connecting body 23, the first head support 18, the carrier 27 and the second head support 21 move along the guide member 26. .

In this embodiment, the first head support 18 and the connecting body 2
3 is made of metal, and since the connecting body 23 is directly connected to the lead screw 28b, there is almost no expansion/contraction due to temperature/humidity changes or deformation over time, so there is extremely little displacement due to environmental changes after manufacturing. , the initial performance can be maintained.

Carrier 2 forming a through hole 27c in which the guide member 26 fits
7 can be mass-produced by making it a molded product made of synthetic resin.

Since the second head support 21 is also made of metal, there is almost no expansion/contraction or deformation over time due to changes in temperature and humidity of the second head support 21. 21, the displacement due to environmental changes after manufacture is extremely small, and the initial performance can be maintained.

Furthermore, the first head support 18 and the second head support 2
1 is made of metal, so the first magnetic head 17
There is also an electrical and magnetic shielding effect for the second magnetic head 20. First magnetic head 17 and second magnetic head 2
Since it is possible to provide the No. 0 shield integrally with the first head support 18 or the second head support 21, and there is no need to provide a separate shield, the degree of freedom in design is extremely large. .

Furthermore, since the first head support 18 and gimbal spring body 19 and the second head support 21 and fixing plate 22 are joined by welding, the usage environment (temperature of 5° to 45°
In an environment where the humidity is 30% to 80%), there is little displacement due to environmental changes, and the initial performance can be fully maintained.

In this embodiment, when the first head support 18, the synthetic resin carrier 27, and the second head support 21 are fastened with the screws 29, the carrier 27 is compressed and deformed, and the fastening force of the screws 29 is reduced. In order to prevent the first magnetic head 17 and the second magnetic head 20 from becoming misaligned due to loosening, a metal distance piece 30 is provided in the through hole 27H of the carrier 27 by insert molding or press fitting. . therefore,
Even if the carrier 27 is made of synthetic resin, the first magnetic head 17
High precision alignment between the magnetic head and the second magnetic head 20 is possible.

In this embodiment, the first head support 18 and the second head support 21 are formed by punching a thin steel plate.
Since the bending pieces 18a and 21c't are provided respectively, the first head support 18 and the second head support 21 have sufficient rigidity and do not bend under normal use conditions. do not have. Moreover, since the bent pieces 18a and 21C are bent toward the surface opposite to the mounting surface of the first magnetic head 17 or the mounting surface of the second magnetic head 20, the first head support 18 and the second The gap with the head support 21 can be set small, making it possible to reduce the thickness of the entire device.

Furthermore, in this embodiment, the mounting position of the arm body 3 and the pressing position of the coil spring 31a of the ammunition machine 31 are set to the second head support body 2.
Since the second head support 21 is arranged substantially in a straight line along the longitudinal direction and the right angle direction of the second head support 21, when the special holiday 21 swings upward, the second head support 21 is bent and permanently deformed. Because there is nothing to do,
Misalignment between the magnetic head 17 and the second magnetic head 20 can be prevented.

In this embodiment, the fixing plate 22 of the second head support 21 is attached to the first magnetic head 17 provided on the gimbal spring 19 held by the pivot 18c to keep the fixing position of the magnetic disk 4 with respect to the reference surface. The provided second magnetic head 20
is pressed by the bullet 31, so the second
Since the head support body 21 side does not resonate due to the gimbal spring body during recording and reproduction of the magnetic disk 4, damage to the magnetic disk 4 can be prevented, and
Swinging of the first magnetic head 17 and the second magnetic head 20 in the direction perpendicular to the reference plane of the magnetic disk 4 is suppressed,
Recording/reproduction start time can be shortened. Also,
The gimbal spring 19 allows the first magnetic head 17 and the second magnetic head 20 to follow the undulations of the magnetic disk 4, thereby improving stable head contact performance.

Note that the carrier 27 and the head support 1 constituting the carriage are
Although the carriage 8 is separate, the carriage 12 may be formed by integrally molding both of them from the same material (synthetic resin or steel plate). Further, the second magnetic head 20 is fixed to the second head support 21 by being fixed to a fixing plate 22 and welding the fixing plate 22 to the second head support 21.
Directly attaching the second head support 2 without providing the fixing plate 22
It may be fixed to 1 by adhesive or the like.

〔Effect of the invention〕

As described above, according to the present invention, a carriage movably provided on one side of a rotating flexible double-sided magnetic disk in the radial direction of the magnetic disk, and a first magnetic head attached to the carriage, a head support located on the other side of the magnetic disk and provided so as to be openable and closable with respect to the carriage; and a first magnetic head opposite to the first magnetic head and attached to the head support. In a magnetic recording and reproducing apparatus, the magnetic recording and reproducing apparatus includes a second magnetic head and an elastic machine engaged with the head support to press the second magnetic head against the first magnetic head via the magnetic disk with a predetermined pressure, The first magnetic head is attached to the carriage via an omnidirectional gimbal spring body supported at a point in a fixed positional relationship with respect to the carriage at a position where both magnetic heads face each other, and Since the second magnetic head is non-gimbally fixed to the head support, resonance of the head support and swinging of the first magnetic head and the second magnetic head in a direction perpendicular to the reference plane of the double-sided magnetic disk occur. This magnetic recording and reproducing apparatus is suitable for recording and reproducing a flexible and high-density double-sided magnetic disk.

[Brief explanation of the drawing]

FIGS. 1 and 2 show the principle structure of the present invention, with FIG. 1 being a cross-sectional side view of the main part, and FIG. 2 being a top view of the main part. 3 to 8 show a magnetic recording/reproducing device adopting the present invention, FIG. 3 is a perspective view showing the main parts assembled, FIG. 4 is a sectional view of the main parts before the magnetic disk is inserted, Fig. 5 is a cross-sectional view of the main parts with the magnetic disk inserted, Fig. 6 is a plan view showing the main parts assembled, Fig. 7 is a side view showing the main parts assembled, and Fig. 8 is an exploded perspective view. . 17... First magnetic head, 18... First head support body, 18c... Pivot, 20... Second magnetic head, 21... Second head support body, 21b... Spring body ,
22...Fixing plate, 27...Carrier, 31a...Coil spring.

Claims (1)

[Claims] 1. A carriage movably provided on one side of a rotating flexible double-sided magnetic disk in the radial direction of the magnetic disk, a first magnetic head attached to the carriage, and a first magnetic head attached to the carriage; a head support located on the other side of the disk and provided so as to be openable and closable with respect to the carriage; a second magnetic head facing the first magnetic head and attached to the head support; , this second
A magnetic recording and reproducing apparatus comprising: a bullet engaged with the head support to press the magnetic head against the first magnetic head via the magnetic disk with a predetermined pressure;
The first magnetic head is attached to the carriage via an omnidirectional gimbal spring body supported at a point in a fixed positional relationship with respect to the carriage at a position where both magnetic heads face each other. A magnetic recording/reproducing device, wherein the magnetic head is fixed to the head support in a non-gimbal manner. 2. The magnetic recording and reproducing apparatus according to claim 1, wherein the gimbal spring body has a degree of freedom of movement in the circumferential direction and radial direction of the magnetic disk. 3. The carriage includes a carrier that moves on a guide member provided on a chassis on which the carriage is mounted, and a head support that is attached to the carrier and to which the first magnetic head is attached via a gimbal spring body. A magnetic recording and reproducing apparatus according to claim 1, characterized in that the magnetic recording and reproducing apparatus comprises: 4. The magnetic recording device according to claim 1, wherein the head support body to which the second magnetic head is attached is provided so as to be openable and closable with respect to the carriage by a spring body made of a leaf spring-like hinge. playback device. 5. The magnetic recording and reproducing apparatus according to claim 1, wherein the ammunition comprises at least a coil spring.