JPH03219470A - Carriage unit of magnetic disk device - Google Patents

Abstract

PURPOSE:To stick a regulation plate on a wide area with sufficient strength and to easily perform the working of the regulation plate with high accuracy by forming the regulation plate in flat shape, and sticking fixedly it on the flat bent part of a head supporting plate. CONSTITUTION:A carriage 6 holds and carries a magnetic head 3. The head supporting plate 5 is stuck fixedly on the upper plane of the carriage at prescribed height. The supporting plate 5 is made of a magnetic material, and the magnetic head 3 is stuck on the upper terminal of a vertical part by bending both terminals 5a, 5b of the plate 5 and fixing on the upper plane of the carriage 6. A hole 5c is formed at the base part of the bent part 5a, and the magnetic head 3 is fixed on the supporting plate 5 by making a magnetic core 3a protrude. The regulation plate 4 is stuck on the bent part 5a of the supporting plate, and the core 3a is inserted with play to a center hole 4a, and the upper terminal is protruded a little over the plate 4, then, it is brought into contact with a magnetic disk. A housing 8 is slided on a shaft 9, and a shaft 5 regulates the turn of the carriage 6. A pin 10 is the one for cam follower, and a projection 6b is the one for tension spring. By employing such structure, it is possible to stick the regulation plate with sufficient strength, and to form it in flat and simplified shape, and to perform the working with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device for magnetically recording or reproducing information on a magnetic disk as a rotating magnetic recording medium.

[Traditional technology] This type of magnetic disk device rotates the magnetic disk, moves a carriage carrying a magnetic head, moves the magnetic head to an arbitrary track position on the magnetic disk, and then moves the magnetic head to a desired track position on the magnetic disk. Magnetic recording or reproduction of information is performed by making a sliding contact. A magnetic disk drive has a regulating member separate from the magnetic head that slides into contact with the magnetic disk together with the magnetic head, regulates the positional relationship of the sliding contact between the magnetic head and the magnetic disk, and stabilizes the sliding contact state between the two. body or integrally provided.

A conventional example of a carriage unit comprising the above-mentioned carriage, magnetic head, regulating member, etc. in such a magnetic disk device is shown in FIGS. 10(A) to 11(C) and FIG. In this case, the above-mentioned regulating member is constructed separately from the magnetic head.

In these figures, reference numeral 6 denotes a carriage which is a carrier for transporting the magnetic head 3. The upper surface of the carriage 6 has an L
A head support plate 29 bent into a letter shape is fixed by adhesive or screws, and a magnetic head 3 for reading or writing signals from the magnetic disk is fixed to the upper end of the plate by screws or adhesive. There is. Further, a regulation plate 30, which is the above-mentioned regulation member, is fixed to the upper end of the head support plate 29. The regulating plate 30 has a convex portion 30a on the lower surface, is formed in a disc shape, and is fixed to the head support plate 29 by bonding the convex portion 30a to the side surface of the head support plate 29. The magnetic core 3a of the magnetic head 3 has a regulating plate 30.
The upper end of the magnetic core 3a protrudes slightly from the upper surface of the regulating plate 30 so that the magnetic core 30a and the regulating plate 30 come into sliding contact with a magnetic disk (not shown). .

[Problems to be Solved by the Invention] However, in the conventional example described above, the area of the adhesive surface for bonding the regulating plate 30 to the head support plate 29 is not large enough, so the fixing strength of the regulating plate 30 is insufficient. , regulation plate 3
There is a lack of stability in maintaining the posture of 0.Also, the regulation plate 30
Since it has a convex portion 30a and has a complicated shape, it is difficult to process and mold it with high precision. For this reason, the sliding contact of the magnetic head with respect to the magnetic disk, so-called head touch, becomes unstable, resulting in a lack of reliability of the apparatus.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and stabilize head touch in this type of magnetic disk device.

[Means for Solving the Problems] In order to solve the above problems, a carriage unit of a magnetic disk device according to the present invention includes a carriage, a head support plate having a predetermined height fixed on the carriage, and a head support plate having a predetermined height fixed on the carriage. It consists of a magnetic head fixed to the upper end of the support plate, and a flat regulation plate that regulates the positional relationship of sliding contact between the magnetic head and the magnetic disk, and the regulation plate is formed at the upper end of the head support plate. Adopted a structure that is fixed by adhesive to the flat bent part.

[Function] According to such a structure, the regulation plate is formed into a flat plate shape,
Since it is fixed by adhering to the flat bent part of the head support plate, the area of the adhesive surface to which the regulation plate is attached can be made sufficiently large, and the regulation plate can be fixed with sufficient strength. Since it is flat and simple in shape, it can be easily processed and molded with high precision.

[Example] Hereinafter, details of embodiments of the present invention will be described with reference to the drawings.

1A to 1C are a plan view, a front view, and a side view showing the structure of a carriage unit provided in a magnetic disk drive according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the carriage unit. It is a diagram.

In these figures, reference numeral 6 denotes a carriage which is a carrier for transporting the magnetic head 3. A head support plate 5 having a predetermined height is fixed to the upper surface of the carriage 6 by adhesive or screwing.

The head support plate 5 is made of a magnetic material such as permalloy alloy, and has bent portions 5a at both upper and lower ends as shown in FIG. 1(C).
, 5b, and the bent portions 5b are fixed to the upper surface of the carriage 6. The magnetic head 3 is fixed to the upper end of the vertical portion of the head support plate 5 by screws or adhesive. As shown in FIG. 2, a hole 5c is formed at the base of the flat bent part 5a, and the upper part of the magnetic head 3 with the magnetic core 3a attached thereto is loosely fitted into this hole 5c, and the magnetic core 3a is folded. The magnetic head 3 is fixed to the head support plate 5 so as to protrude above the curved portion 5a.

Further, on the upper surface of the bent portion 5a of the head support plate 5, the regulating plate 4 is fixed by adhesive for stabilizing the sliding contact state between the magnetic head 3 and the magnetic disk 31 as described above.

The regulating plate 4 is formed into a flat disk shape, and is adhered to the upper surface of the flat bent portion 5a of the spatula support plate 5. Further, as shown in FIG. 7, a hole 4a is formed in the center of the regulating plate 4, and a magnetic core 3a of the magnetic head 3 is placed in this hole 4a.
is loosely fitted, and the medium sliding surface at the upper end of the magnetic core 3a is connected to the side plate 4.
It protrudes slightly from the top surface and can come into sliding contact with the magnetic disk 31 which is rotated in the direction of the arrow during recording and reproduction. Note that the upper surface of the regulation plate 4 has C-shaped low protrusions 4b, 4.
C is formed, and the flat upper surfaces of the protrusions 4b and 4c come into sliding contact with the magnetic disk 31.

On the other hand, as shown in FIGS. 1 and 2, a cylindrical housing 8 is fixed to the upper surface of the carriage 6 with screws, and an oilless bearing metal 7 is press-fitted into this housing 8. A guide shaft 9 is slidably fitted into the metal 7. Further, a hook 6a is provided protruding from the center of the carriage 6, a protrusion 6b is formed on one end, and a cam follower bin 10 is implanted on the other end.

Next, in the magnetic disk device of this embodiment, the carriage 6
The structure of the carriage moving mechanism that moves the carriage and peripheral mechanisms related to the mechanism will be explained with reference to FIGS. 3 to 7.

First, FIGS. 3 and 4 are a plan view and an exploded perspective view of the entire mechanism. As shown in FIG. 3, the carriage unit is assembled to the chassis 1 by fixing the guide shaft 9 of the carriage unit described above to the chassis 1 of the apparatus with screws. In this state, the carriage 6 can rotate up and down about the guide shaft 9, and is biased by a plate spring 14 fixed on the chassis 1 in a rotation direction in which the magnetic head 3 protrudes upward. However, the protrusion 6b of the carriage 6 is attached to the shaft 1 fixed on the chassis 1.
5, the rotational limit of the carriage 6 is restricted to a predetermined value.

The carriage 6 is slidable by a guide shaft 9 in the directions of arrows a and b in FIG. It is biased in direction b.

On the other hand, reference numeral 16 denotes a drive motor of the carriage moving mechanism, and a pinion 17 fixed to the drive shaft meshes with a large gear portion 19a of an intermediate gear 19 supported by a shaft 18 implanted in the chassis l. The small gear portion 19b of the intermediate gear 19 meshes with the gear portion 11b of the cam gear 11 which is supported by a shaft 20 implanted in the chassis l. The bottle lO of the carriage 6 is pressed against the cam portion 11a formed on the cam gear 11 by the biasing force of the spring 12.

The cam gear 11 is biased counterclockwise in FIG. 3 by a torsion coil spring 21 whose both ends are locked by a hook llc protruding from the cam gear 11 and a hook 22 provided on the chassis l.

Further, a protrusion lid is provided on the upper surface of the cam gear 11.

Next, near the cam gear 11, an operating spring 26 is rotatably supported by a small diameter portion 25b of a stepped shaft 25 implanted in the chassis 1. This arm 26 operates the track position detection switch 23. The switch 23 is attached to a base 24. The base 24 is fitted onto the large diameter portion 25a of the shaft 25, and is fixed by passing a screw 40 into an elongated hole 24d formed in the base 24 and tightening the screw 40 to the chassis 1. Loosen screw 40 and remove shaft 25.
The position of the base 24 can be adjusted by rotating the base 24 in directions c and d using the fulcrum as a fulcrum. Further, a bent portion 24a having a U-shaped groove is formed at one end of the base 24, and two bent portions 24b and 24c are formed at the other end. The actuating arm 26 is formed by the bent portions 24b and 24c.
The rotation range of is restricted.

On the other hand, in the center of the area between the shafts 9 and 15 of the chassis l shown in FIG. 3, there is a large circular hole 1a as shown in FIG.
A spindle motor 2, which is a drive source of a rotational drive mechanism, is fitted into this hole 1a and fixed to the chassis 1 with screws. As shown in FIGS. 5 and 6, a disc-shaped spindle 2b is fixed to the upper end of the rotating shaft 2a of the spindle motor 2. As shown in FIGS.

When the magnetic disk cassette 32 that rotatably accommodates the magnetic disk 31 shown in FIG. 5 is loaded into the magnetic disk device, the cassette 32 is loaded onto the spindle 2b by a mechanism not shown, and as shown in FIG. The center core 33 of the magnetic disk 31 is fitted onto the rotating shaft 2a and held on the spindle 2b.
This is what is called chucking. The guide set 32 has an opening 32 a formed therein for the magnetic head 3 to access the magnetic disk 31 .

Next, the operation of the above configuration will be explained.

First, when the device is powered on, track 00 detection is performed to move the magnetic head 3 to the outermost track position of the magnetic disk 31. This operation will be explained with reference to FIG.

In FIG. 8, the drive motor 16 is driven to rotate in the direction of arrow A, the intermediate gear 19 is rotated in the AI force direction via the pinion 17, and the cam gear 11 is rotated in the A2 direction. Accompanying this, the cam portion 11a presses the bottle lO of the carriage 6, and the carriage 6 moves in the direction a against the biasing force of the spring 12.

Eventually, the protrusion lid comes into contact with the actuation arm 26 due to the amount of rotation of the cam gear 11, causing the actuation arm 26 to rotate in the A3 direction.The other end of the arm 26 presses the movable piece of the switch 23, and when the switch 23 is turned on, the drive is activated. The motor 16 is stopped and the carriage 6 is stopped. And the motor 16 is B
It is rotated by a small predetermined amount in the direction. As a result, the pinion 17, intermediate gear 19, and cam gear 11 are
- Cam portion 11a that rotates in the B2 direction and comes into contact with the bottle 10
The cam surface moves backward, and the carriage 6 is moved by a small predetermined amount in the b direction by the biasing force of the spring 12.

The position thus moved is stored as a position corresponding to the outermost track position, and the requested track is accessed using this as a reference. Note that the detection position of this outermost track can be finely adjusted. That is, as mentioned above, loosen the screw 40 and attach the base 24 to the positions shown in FIGS. 8 and 9.
By rotating the switch 23 in directions c and d in the figure and moving the switch 23, the rotation angle of the cam gear 11 at which the switch 23 is turned on can be changed, and the position of the carriage 6 at which the switch 23 is turned on can be changed.

1 2 On the other hand, when the magnetic disk cassette 32 shown in FIG.
Then, as shown in FIG. 6, the center core 33 of the magnetic disk 31 is chucked onto the spindle 2b. The magnetic disk 31 is rotated by the drive of the spindle motor 2.

When a host system (not shown) requests access to the magnetic disk device, the drive motor 16 shown in FIG. 8 is rotated in the direction B by an amount corresponding to the requested track position, and the carriage 6 is moved in direction b to a position corresponding to the requested track position.

During this time, the carriage 6 is rotated by the drive of a solenoid (not shown) so that the magnetic head 3 is separated from the magnetic disk 31, but when the carriage 6 reaches the requested track position, the solenoid is de-energized. The carriage 6 rotates in the direction in which the magnetic head 3 approaches the magnetic disk 31 by the biasing force of the leaf spring 14 . The magnetic core 3a of the magnetic head 3 is inserted into the opening 3 of the disk cassette 32.
It comes into sliding contact with the magnetic disk 31 via the magnetic disk 2a as shown in FIG. 7, and signals are recorded or reproduced on the required track of the magnetic disk 31.

Here, the regulating plate 4 as well as the magnetic core 3a of the magnetic head 3 comes into sliding contact with the magnetic disk 31 to regulate the positional relationship of sliding contact between the magnetic disk 31 and the magnetic core 3a, thereby stabilizing the sliding contact state. .

According to the present embodiment as described above, the regulation plate 4 is formed into a flat disk shape and is fixed by adhering to the flat bent portion 5a of the head support plate 5. The area of the adhesive surface can be made sufficiently large, and the regulating plate 4 can be fixed with sufficient strength. Therefore, the posture of the regulating plate 4 can be stably maintained. Moreover, since the regulating plate 4 has a simple shape and can be easily processed and molded with high precision, good head touch can be stably maintained regardless of environmental changes, and the reliability of the magnetic disk device can be improved.

Further, according to the present embodiment, the head support plate 5 is made of a magnetic material such as a par 3 4 malloy alloy, and the magnetic head 3 is loosely fitted into the hole 5C, and the entire circumference of the magnetic head 3 is surrounded by the magnetic material. Therefore, the magnetic head 3 can be effectively shielded from the magnetic field.

[Effects of the Invention] As is clear from the above description, the carriage unit of the magnetic disk drive according to the present invention includes a carriage, a head support plate fixed on the carriage and having a predetermined height, and an upper end of the support plate. It consists of a magnetic head fixed to the head, and a flat plate-like regulating plate that regulates the positional relationship of sliding contact between the magnetic head and the magnetic disk, and the regulating plate is a flat folded plate formed at the upper end of the head support plate. Since we have adopted a structure in which the regulation plate is glued and fixed to the curved part, the area of the adhesive surface to which the regulation plate is attached is sufficiently large, and the regulation plate can be fixed with sufficient strength, making it possible to control the posture of the regulation plate. In addition to being able to stably hold the regulating plate, the regulating plate can be easily processed and molded with high precision, resulting in the excellent effect of stably maintaining good head touch and improving the reliability of the magnetic disk device.

[Brief explanation of drawings]

Figures 1 (A), (B), and (C) are a plan view, a front view, and a side view showing the structure of a carriage unit of a magnetic disk drive according to an embodiment of the present invention, respectively, and Figure 2 is an exploded view of the unit. 3 and 4 are respectively a plan view and an exploded perspective view showing the structure around the carriage moving mechanism of the magnetic disk device of the same embodiment, and FIG. 5 is a perspective view of the spindle motor and magnetic disk cassette of the same device. Fig. 6 is a partially cutaway side view of the spindle motor section, Fig. 7 is a side sectional view showing the state of sliding contact between the magnetic head and the regulating plate with respect to the magnetic disk, and Figs. 8 and 9 are carriage movement. Plan view and side view showing the operation of the mechanism, Figures 1O (A) and (B)
, (C) are a plan view, a front view, and a side view showing the structure of a carriage unit of a conventional magnetic disk device, respectively;
FIG. 11 is an exploded perspective view of the unit. 1...-Chassis 2...-Spindle motor 3.
...Magnetic head 4...Restriction plate 5--Head support plate 6-Carriage 5 6 11...Cam gear 16...Drive motor 31--
-Magnetic disk 7 664

Claims (1)

[Claims] 1) A carriage, a head support plate fixed on the carriage and having a predetermined height, a magnetic head fixed to the upper end of the support plate, and a sliding contact between the magnetic head and a magnetic disk. Consists of a flat regulation plate that regulates the positional relationship of dynamic contact.
A carriage unit for a magnetic disk drive, wherein the regulating plate is adhesively fixed to a flat bent portion formed at an upper end of the head support plate. 2) The magnetic disk device according to claim 1, wherein the head support plate is made of a magnetic material, and the magnetic head is loosely fitted into a hole formed in the bent portion of the support plate. carriage unit.