JPS62223875A - Recording and reproducing device for magnetic disk - Google Patents

Abstract

PURPOSE:To realize a miniaturization and thinning, light weighing, low costing and to shorten an assembly and adjustment times by having the minimum dimensional shape planely and by fitting the main component on the main base worked with high accuracy, by having about the same dimension planely and by fitting to the sub-base worked with rough accuracy. CONSTITUTION:The main component is integrally fitted onto the main base 1 which is miniaturized and thinned and worked with high accuracy, and this main base 1 is fitted to the sub-base 13 which has about the same dimension with the device planely and which is roughly worked comparatively in its precision, for instance, subjected to a sheeting or synthetic resin forming, but a cushion 12 with spacer is subjected to a bushing to the fitting part which is engaged with the sub-space 13 of the main base 1. The composition is made by fitting a bolt 10, washer 11 to the sub-base 13 through the cushion 12 with spacer. In this way, the main base 1 to which a high accurate work is required can be miniaturized and costed down.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mechanical structure in a flexible disk recording/reproducing device.

[Conventional technology]

FIG. 3 is an exploded perspective view showing the main parts of a conventional magnetic disk recording/reproducing device. In the figure, reference numeral 1 denotes a main base that is approximately the same size in plan as the main body of the magnetic disk recording/reproducing apparatus.
, a stepping motor for moving the head (not shown), a sensor 4 such as a TKOO sensor for positioning the head, etc. are attached. Furthermore, the head carriage 5 is movably mounted on the main base 1 through the guide rod 6 by fixing both ends of the guide rod 6 of the head carriage 5 with bolts 8 via clamps 7. The side surface 5a of the head carriage 5 is engaged with the screw shaft 3a of the stepping motor 3, so that the rotation of the stepping motor 3 moves the head carriage 5 step by step.

In recent years, magnetic disk recording and reproducing devices have become increasingly smaller and thinner, and at the same time, there has been a trend toward larger recording capacities. On the other hand, the magnetic properties of magnetic disk media are improving, and the performance and density are increasing, and along with this, magnetic disk recording and reproducing devices are required to have a higher track pitch and higher precision. On the other hand, market demand for lower costs is increasing.

The material of the magnetic disk medium is a base film coated with a magnetic layer of about 1 to 13 μm on the surface, and expands and contracts freely depending on changes in temperature and humidity. In order to follow this trend, the main base 1 constituting the magnetic disk recording/reproducing device is made of a material such as aluminum die-casting, which has a thermal expansion coefficient of approximately the same order as that of the magnetic disk medium. Because of the processing involved, the cost of the main base 1 is extremely high. moreover,
The spindle motor 2, which rotates the magnetic disk medium,
High precision is required to prevent center runout. Stepping motor which is a system for positioning the head 3. Head carriage5. As for the guide rod 6, it goes without saying that the material selection and processing accuracy should be improved in the same manner.

[Problem that the invention seeks to solve]

In the conventional magnetic disk recording and reproducing device as described above, the main base 1 has a planar dimension that is approximately the same as the device, and thus the main base 1 is made smaller and thinner.

This is an impediment to weight reduction and cost reduction, and since most of the parts that make up the device are mounted on the main base 1, which is machined with high precision, it is difficult to assemble and adjust during production. However, there were also problems such as the need for a very large amount of time.

This invention was made to solve these problems, and it is possible to reduce the size, thinness, weight, and cost of magnetic disks, reduce the time required for assembly and adjustment during production, and improve economic efficiency. The purpose is to obtain a recording/reproducing device.

[Means for solving problems]

The magnetic disk recording and reproducing device according to the present invention has a main base that has minimum dimensions and shape in a plane and is machined with high precision, and a stepping motor that moves the head, which is a main component that requires high precision. , main parts such as a disk carriage that is fed in steps by the rotation of this stepping motor, a sensor that positions the head, and a spindle motor for rotating the disk are attached, and the main parts are mounted on the main base via a cushioning material bushed. It is attached to a sub-base that has approximately the same dimensions as the device and is machined with rough precision.

[Effect]

In the magnetic disk recording/reproducing device of the present invention, in order to make the entire device smaller and thinner, the main base has a minimal shape and a minimum volume on which the main parts are attached to improve the processing accuracy of the device. The overall characteristics can be determined by the assembly of the main base part, and by making the sub-space approximately the same size as the device in plan view, this sub-space can be compared, including external attachment etc. Install components that do not require precision.

〔Example〕

FIG. 1 is an exploded perspective view showing the main parts of a magnetic disk recording/reproducing apparatus which is an embodiment of the present invention. In the figure, reference numeral 1 denotes a main base made of molded parts such as aluminum die-cast material, which has minimum dimensions and shape in a plane and is processed with high precision. A stepping motor 3 for moving the head, a head carriage 5 for step-feeding by the rotation of the stepping motor 3, and a sensor 4 such as a TKOO sensor for positioning the head are attached. Similar to the conventional example shown in FIG. It is installed so that it can be moved freely. Side surface 5 of head carriage 5
a is engaged with a screw shaft 3a of a stepping motor 3, and the rotation of the stepping motor 3 causes the herad carriage 5 to be fed step by step. Further, on the main base 1, a spindle motor 2 for rotating a magnetic disk medium (not shown) is attached with bolts 9. In the magnetic disk recording and reproducing device according to the present invention, the main components of the magnetic disk recording and reproducing device are mounted together on a main base 1 that is small and thin and processed with high precision.
It is attached to a sub-base 13 that has approximately the same dimensions as the device in plan view, and is relatively rough in terms of accuracy and is machined, for example, by sheet metal processing or synthetic resin molding. A cushion 12 with a spacer is bushed on a mounting portion of the main base 1 that engages with a sub-base 13. As shown in FIG. It is constructed by passing a washer 11 through a cushion 12 with a spacer and attaching a sub-base 13.

In the magnetic disk recording/reproducing device configured in this way, the main base 1, which requires high-precision machining, can be made smaller and lower in cost.
On top are spindle motor 2, stepping motor 3,
Since the main parts such as the sensor 4, head carriage 5, and guide rod 6 are attached, it has the advantage of being easy to adjust after assembly and ensuring high precision.It also has an economical effect because the adjustment time can be shortened. There is also.

In addition, since the sub-base 13 is made of rough-accuracy sheet metal processing or synthetic N resin molded parts, the sub-base 13 is different from the conventional main base 1 shown in FIG.
The main base 1 and sub-base 13 that are divided into two parts in the embodiment of the present invention shown in the figure are more advantageous in terms of cost and ease of assembly, and furthermore, the overall device is smaller. becomes possible.

In the above embodiment, the main base 1 is made of a molded part such as aluminum die-casting material, but in recent years, the accuracy of sheet metal processing has improved considerably, and for this reason, the main base 1 and the sub-base Both parts 13 and 13 may be made of sheet metal parts, and the same effects as in the above embodiment can be obtained. Furthermore, it goes without saying that the sub-base 13 may be a molded part made of synthetic wood.

〔Effect of the invention〕

As described above, the present invention provides a magnetic disk recording/reproducing device in which a stepping motor, a head carriage 2 sensor, a spindle motor, etc. This main base is attached to a sub-base that is roughly the same size as the device in plan view and machined with rough precision, making it smaller and thinner.

In addition to being lighter and lower in cost, it is also easier to adjust during the assembly process during production, and efficiency can be improved by shortening assembly adjustment time.In addition, the main base is smaller, which reduces costs. In addition, the main base and sub-base have an IX effect against vibrations and shocks from the outside of the device through the use of cushions, which improves the performance of conventional devices of this type and provides inexpensive devices. It has an ambiguous effect.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the main parts of a magnetic disk recording/reproducing apparatus which is an embodiment of the present invention, FIG. The figure is an exploded perspective view showing the main parts of a conventional magnetic disk recording/reproducing device. In the figure, 1- Main base, 2 Spindle motor, 3 Stepping motor, 3a Screw shaft,'
4.Sensor, 5.Head carriage, 5a.Side, 6
・Guide rod, 7・ Clamp, 8.9, 10...
Bolt, 11... washer, 12 - shoe pad with spacer, 13... sub-base. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In a magnetic disk recording and reproducing device, main components such as a stepping motor that moves the head, a head carriage that moves the head in steps by the rotation of this stepper motor, a sensor that positions the head, and a spindle motor that rotates the disk are arranged in a planar manner. It is mounted on a main base that has minimum dimensions and shape and is machined with high precision, and is assembled and adjusted. A magnetic disk recording/reproducing device configured to be attached to a processed sub-base, and having a cushion with a spacer bushed in the attachment portion of the main base that engages with the sub-base to provide a buffering effect against vibrations and shocks. Device.