JPH06302172A - Frame structure of magnetic disk recording and reproducing device - Google Patents

Abstract

(57) [Abstract] [Purpose] It is applied to a magnetic disk recording / reproducing apparatus to increase the rigidity of the main frame, reduce the deformation against external force, and improve the off-track performance. [Structure] A flat plate whose main component is iron or aluminum is punched, bent, drawn, and screwed to adjacent side plates.
Alternatively, the main frame is formed in a box shape by fixing it by caulking. Main parts such as a main shaft motor, a head carriage, a guide shaft, and a seek motor are arranged on or inside the main frame. [Effect] It is possible to realize an inexpensive magnetic disk recording / reproducing apparatus while improving the off-track performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure in the field of magnetic disk recording / reproducing.

[0002]

2. Description of the Related Art As shown in Japanese Utility Model Laid-Open No. 61-105990, a structure of a conventional magnetic disk recording / reproducing apparatus is such that a seek motor holding member, a head carriage guide shaft, a bezel and other parts are directly composed of a single flat iron plate. It was attached to the frame. The main frame made of a flat iron plate has a low rigidity because the plate thickness must be reduced due to the weight limitation of the device, and the rigidity is low.
In order to secure rigidity, additional parts were attached, which inevitably led to an increase in the number of parts and an increase in cost.

Further, as shown in Japanese Patent Laid-Open No. 62-165777, there is also a conventional example in which the above parts are attached to a main frame made of a molded product of an aluminum die casting material. Although the main frame, which is a molded product of aluminum die-cast material, is lightweight but still secures rigidity, the cost of the main frame was extremely high, which was a factor in increasing the cost of the device.

[0004]

As described above, in the conventional magnetic disk recording / reproducing apparatus, the rigidity is low in the main frame of the flat iron plate, and when vibration or shock is applied from the outside of the apparatus, the apparatus is When it is attached to the main body apparatus, the main frame is largely distorted and the relative positional relationship between the spindle motor and the head carriage changes, which causes increase in off-track between desired tracks of the magnetic disk medium and the magnetic head. Further, the main frame made of an aluminum die cast material is lightweight and has sufficient rigidity, but it causes an increase in the cost of the apparatus.

The present invention has been made in order to solve such a problem, and it is a main frame made of one plate as a material, but the rigidity of the frame is secured, and the cost can be reduced. It is an object to provide a disc reproducing device.

[0006]

[Means for Solving the Problems]

(1) In a magnetic disk recording / reproducing apparatus, a main shaft motor that rotationally drives a magnetic disk medium, a guide shaft that supports a head carriage, and a seek motor that slides the head carriage in the radial direction of the magnetic disk medium are directly or indirectly. The main frame to be fixed to is a box shape consisting of a bottom plate or a top plate and a plurality of side plates obtained by pressing, bending or drawing one plate containing iron or aluminum as a main component. At least a pair of adjacent side plates of the side plates are fixed.

(2) In (1), in the adjacent side plates, the first side plate is overlapped and fixed to the plate extending from the second side plate.

(3) In (2), the first side plate and the plate extending from the second side plate are fastened with a screw member.

(4) In (2), a burring or dowel headed to the first side plate provided on the plate extending from the second side plate is provided at a position where the first side plate corresponds to the burring or dowel. It is characterized by being fitted into a hole and caulking.

(5) In (1), in the adjacent side plates, the first side plate intersects with the second side plate and is fixed.

(6) In (5), the first side plate is crimped to the second side plate.

[0012]

In the magnetic disk recording / reproducing apparatus of the present invention,
The main frame is made of iron or aluminum as a main component, and is punched, bent, drawn, etc. to form a box shape, and adjacent side plates are fixed by screws or caulking. It has a much higher rigidity than the flat plate, and the distortion of the main frame is greatly reduced when vibration or shock is applied from the outside of this device, or when this device is attached to the main unit. Off-track changes are much smaller.

Further, for a molded part made of an aluminum die cast material, a very inexpensive frame can be obtained while ensuring the same rigidity and performance, and a device which can satisfy the market demand for a low price has been obtained.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below based on the embodiments shown in the drawings.

(Embodiment 1) FIG. 1 is a perspective view showing the configuration of a magnetic disk recording / reproducing apparatus according to an embodiment of the present invention, FIG. 2 (a).
2B is a partially enlarged perspective view showing a characteristic portion of the main frame 10, and FIG. 2B is a partially enlarged perspective view showing a plate of the main frame 10 before processing such as pressing, bending, and drawing. A head that supports a spindle motor (not shown) that rotatably drives a magnetic disk medium (not shown) on or in the main frame 10 and a magnetic head (not shown) that slides in the radial direction of the magnetic disk medium. A carriage 22, a guide shaft 20 for guiding the head carriage 22 only in the radial direction of the magnetic disk medium, a seek motor 21 for step-driving the head carriage 22 by a rack and pinion method or a screw method, and the like are arranged. .

The main frame 10 is formed by bending a flat plate containing iron or aluminum as a main component as shown in FIG. 2 (b) and bending it to form a box shape as shown in FIG. 2 (a). The first side plate 11 of the main frame 10 and the side plate 1
The plate 13 extending from the second side plate 12 adjacent to 1 overlaps, and the screw member 23 is fastened through the holes 24 and the screw holes 25 formed in the side plate 11 and the plate 13, respectively.
To fix.

Since the main frame 10 formed as described above has a box shape with respect to one flat plate, the rigidity is remarkably increased even if the thickness is the same, and external force such as twisting or bending is applied. On the other hand, the deformation of the main frame 10 is reduced and the off-track is reduced. Further, by increasing the number of places where adjacent side faces are fixed, such as fixing the plate 15 and the side plate 11 extending from the third side plate 14, the rigidity of the main frame 10 is further increased, and a device with good performance is obtained. In addition, since it is a flat plate processed product while ensuring rigidity, it is a very inexpensive frame for molded parts made of aluminum die-cast material, and it is a device that can satisfy the market demand for cost reduction.

(Embodiment 2) Next, FIG. 3 shows another embodiment of the present invention. FIG. 3 is a partially enlarged perspective view showing a characteristic part of the main frame 10. The main frame 10 has a shape in which a flat plate containing iron or aluminum as a main component is pressed and then drawn, and as shown in FIG.
It has a box shape in which a narrowed portion 18 is generated at the corner of 0.
The fixing is similar to the first embodiment, the first side plate 11 of the main frame 10 and the plate 13 extending from the second side plate 12 adjacent to the side plate 11 overlap each other, and the holes 24 formed in the side plate 11 and the plate 13, respectively. The screw member 23 is fastened through the screw hole 25 to fix the side plate 11 and the plate 13.

The rigidity of the main frame 10 formed as described above is higher than that of the first embodiment, and the deformation of the main frame 10 against external force such as twisting and bending is reduced, and the off-track is reduced.

(Embodiment 3) Next, FIGS. 4 and 5 show another embodiment of the present invention. FIG. 4 is a partially enlarged perspective view showing a characteristic portion of the main frame 10, and FIG.
FIG. 6 is a cross-sectional view of a characteristic portion on the p plane. Main frame 1
0 is a shape obtained by pressing and then drawing a flat plate containing iron or aluminum as a main component, and FIG.
As shown in (a), the plate 13 is provided with a burring 15 facing the first side plate 11, and the first side plate 11 is the burring 1.
A hole 31 is provided at a position corresponding to 5. To fix the side plate, after inserting the burring 15 into the hole 31, caulking is performed as shown in FIG.

The main frame 10 formed as described above has characteristics similar to those of the first embodiment, the deformation of the main frame 10 against external force is small, and the off-track is reduced. Further, since the screw member 23 is unnecessary, the device can satisfy the market demand for cost reduction, which leads to reduction of the number of parts and cost.

(Embodiment 4) FIGS. 6 and 7 show another embodiment of the present invention. 6 (a) is a partially enlarged perspective view showing a characteristic part of the main frame 10, and FIG. 6 (b) is a partially enlarged perspective view showing a plate of the main frame 10 before processing such as pressing, bending and drawing. 7 is a partially enlarged perspective view showing a characteristic portion of the main frame 10. The main frame 10 has a blank shape as shown in FIG. 6B, and the first side plate 11 has the second side plate 1
A concave portion 16 is formed in a portion corresponding to 2 and a convex portion 17 is formed in a portion corresponding to the first side plate 11 on the second side plate 12.
When the punched shape of FIG. 6B is bent, the concave portion 16 and the convex portion 17 are fitted to each other, and the side plates 11 and 12 are in an intersecting state. Further, the side plate 11 and the side plate 12 are fixed by crimping the convex part 17 to the concave part 16.

The main frame 10 formed as described above has characteristics similar to those of the first embodiment, the deformation of the main frame 10 against external force is small, and the off-track is reduced. Further, since the screw member 23 is unnecessary, the device can satisfy the market demand for cost reduction, which leads to reduction of the number of parts and cost.

Further, as shown in FIG. 7, if holes 18 are formed in the first side plate 11 instead of the recesses 16 and caulking, the fixing force is further increased and the rigidity of the main frame 10 is increased.

[0025]

As described above, according to the present invention, in a magnetic disk recording / reproducing apparatus, a flat plate containing iron or aluminum as a main component is punched, bent, and drawn,
The main frame is formed in a box shape by fixing the side plates adjacent to each other with screws or caulking. Since the main shaft motor, head carriage, guide shaft, and seek motor, etc. are placed on or within the main frame, the main frame is deformed even if external force such as bending or twisting is applied. Becomes smaller and the off-track becomes smaller accordingly. In addition, since the main frame is formed by processing one plate, the rigidity is the same as that of the main frame made by the conventional aluminum die-cast material, but the cost is low and the device satisfies the market requirements. It was

[Brief description of drawings]

FIG. 1 is a configuration perspective view showing an embodiment of a magnetic disk recording / reproducing apparatus of the present invention.

FIG. 2 is a partially enlarged perspective view showing a characteristic part of the present invention.

FIG. 3 is a partially enlarged perspective view showing a characteristic part of another embodiment of the present invention.

FIG. 4 is a partially enlarged perspective view showing a characteristic part of another embodiment of the present invention.

5 is a partial enlarged cross-sectional view taken along the plane ppp-p-p in FIG.

FIG. 6 is a partially enlarged perspective view showing a characteristic part of another embodiment of the present invention.

FIG. 7 is a partially enlarged perspective view showing a characteristic part of another embodiment of the present invention.

[Explanation of symbols]

 10 main frame 11 first side plate 12 second side plate 13 plate extending from second side plate 14 third side plate 15 plate extending from third side plate 16 recessed portion formed on first side plate 17 second side plate Convex part formed on 18 Draw part 19 Burring 20 Guide shaft 21 Seek motor 22 Head carriage 23 Screw member 24 hole 25 Screw hole 30 Caulking hole 31 hole

Claims (6)

[Claims] 1. In a magnetic disk recording / reproducing apparatus, a main shaft motor that rotationally drives a magnetic disk medium, a guide shaft that supports a head carriage, and a seek motor that slides the head carriage in the radial direction of the magnetic disk medium, directly or The main frame, which is indirectly fixed, has a box shape consisting of a bottom plate or a top plate and a plurality of side plates obtained by pressing, bending or drawing a single plate mainly composed of iron or aluminum. Of the side plates
A frame structure for a magnetic disk recording / reproducing apparatus, wherein at least a pair of adjacent side plates are fixed. 2. The frame structure of a magnetic disk recording / reproducing apparatus according to claim 1, wherein in the adjacent side plates, the first side plate is overlapped and fixed to the plate extending from the second side plate. 3. The frame structure for a magnetic disk recording / reproducing apparatus according to claim 2, wherein the first side plate and the plate extending from the second side plate are fastened together by screw members. 4. A burring or dowel heading to the first side plate included in a plate extending from the second side plate is fitted into a hole provided at a position corresponding to the burring or dowel, by the first side plate, The frame structure of the magnetic disk recording / reproducing apparatus according to claim 2, wherein the frame structure is caulked. 5. The frame structure of a magnetic disk recording / reproducing apparatus according to claim 1, wherein, in the adjacent side plates, the first side plate intersects and is fixed to the second side plate. 6. The frame structure of a magnetic disk recording / reproducing apparatus according to claim 5, wherein the first side plate is crimped to the second side plate.