JPH0524588B2 - - Google Patents

Description

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

[Prior Art] FIG. 2 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 having approximately the same size in plan as the main body of the magnetic disk recording/reproducing apparatus.On this main base 1, a spindle motor 2 for rotating a magnetic disk medium (not shown) and a head (not shown) are moved. stepping motor 3,
A sensor 4 such as a TKOO sensor for positioning the head is attached. Furthermore, the head carriage 5 is movably mounted on the main base 1 by fixing both ends of the guide rod 6 of the head carriage 5 with bolts 8 through clamps 7.
The side surface 5a of the head carriage 5 is engaged with the screw shaft 3a of the stepping motor 3, and as the stepping motor 3 rotates, the head carriage 5
I'm trying to make it step forward.

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 have been improved, and the performance and density are increasing, and along with this, magnetic disk recording and reproducing devices are also required to have higher track pitches and higher precision. On the other hand, the market demand for low cost products is increasing.

The material of the magnetic disk medium is a base film coated with a magnetic layer of about 1 to 1.3 μm on the surface, and expands and contracts freely depending on changes in temperature and humidity. In order to follow this, the main base 1 that constitutes the magnetic disk recording and reproducing device
Because the main base 1 is manufactured with high precision using materials such as aluminum die-casting, which has a coefficient of thermal expansion on the same order as that of the magnetic disk medium, the cost of the main base 1 is extremely high. become.
Furthermore, the spindle motor 2 that rotates the magnetic disk medium is also required to have high precision to avoid core runout. For the stepping motor 3, head carriage 5, and guide rod 6, which are the system for positioning the head, material selection and
Of course, it is intended to improve machining accuracy.

[Problems to be Solved by the Invention] In the conventional magnetic disk recording/reproducing device as described above, the main base 1 has a planar dimension that is approximately the same as the device. This is an impediment to weight reduction and cost reduction, and also because most of the parts that make up the device are installed in a wide space on the main base 1, which is machined with high precision. However, there were problems such as a large amount of time required for assembly and adjustment during production.

This invention was made in order to solve these problems, and it is possible to reduce the size, thickness, weight, and cost of magnetic disks, as well as shorten the time for assembly and adjustment during production. The purpose is to obtain a recording/reproducing device.

[Means for Solving the Problems] A magnetic disk recording and reproducing device according to the present invention includes:
A magnetic disk recording/reproducing device in which parts are arranged on a base consisting of a main base and a sub-base, and the main base includes a stepping motor for moving the head, and a step feeding by the rotation of the stepping motor. A head carriage and a spindle motor for rotating the disk are disposed, and the main base is formed by high-precision machining that defines the positional relationship of the disposed parts and does not impair the adhesion performance between the medium and the head. , the sub-base is formed by processing with coarser precision than the main base.

Further, the planar shape of the main base is made smaller than the device, and the planar shape of the sub-base is made to have approximately the same dimensions as the device.

In addition, cutouts are provided in portions of the main base that are not involved in mounting major components such as the stepping motor and head carriage.

[Function] In the magnetic disk recording/reproducing device of the present invention, the substrate for mounting components is divided into a main base and a sub-base, the main base is formed by high-precision processing, the sub-base is formed by coarse-precision processing, Main parts such as the stepping motor, head carriage, sensor, and spindle motor are mounted on the high-precision main base, making it possible to determine the characteristics of the entire device by assembling the main base. The positional accuracy between the arranged parts can be obtained with the desired high precision.

Further, by making the planar shape of the main base smaller than the dimensions of the device, the entire device can be made smaller and thinner, and the main base can be easily processed with high precision, which requires high precision.

In addition, by making the sub-base approximately the same size as the device in plan view, the sub-base has the following features:
Attach components that do not require relatively high precision, including external attachments.

Further, the planar shape of the main base can be minimized by leaving only the parts necessary for attaching the parts necessary to configure the device and cutting out the parts not necessary for the parts device.

[Embodiment] FIG. 1 is an exploded perspective view showing the main parts of a magnetic disk recording and 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 dimensions and shape smaller than the sub-base described later in plan and is processed with high precision.On this main base 1, A stepping motor 3 (not shown) for moving the head, a head carriage 5 for moving the head in steps by the rotation of the stepping motor 3, and a sensor 4 such as a TKOO sensor for positioning the head are installed. Similar to the conventional example shown in FIG. 2, the head carriage 5 is movably mounted on the main base 1 by fixing both ends of the guide rod 6 of the head carriage 5 with bolts 8 through clamps 7. It is being 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 causes the head carriage 5 to be fed in steps. Also, main base 1
A spindle motor 2 for rotating a magnetic disk medium (not shown) is attached to the top with bolts 9. In the magnetic disk recording and reproducing apparatus according to the present invention, the main parts of the magnetic disk recording and reproducing apparatus are mounted together on a main base 1 that is small and thin and processed with high precision. The sub-base 10 has approximately the same dimensions as the device in plan view and is relatively roughly processed in terms of accuracy, for example, formed by sheet metal processing or molding of metal or synthetic resin. Installed and configured.

In addition, the main base 1 is cut out to form cutout portions 1A and 1B in which the main parts such as the stepping motor 3, the sensor 4, and the head carriage 5 are attached, so that the main base 1 has a minimum planar shape. ing.

In the magnetic disk recording/reproducing apparatus constructed in this manner, the main base 1, which requires highly accurate machining, is downsized, improving machining accuracy and making it possible to reduce costs. Also, main base 1
Main parts such as the spindle motor 2, stepping motor 3, sensor 4, head carriage 5, and guide rod 6 are mounted on the top, making it easy to adjust the positional relationship of the main parts after assembly. It has the advantage of ensuring adhesion performance, and also has an economical effect because the adjustment time can be shortened. In addition, the notches 1A and 1B of the main base 1 are provided with holes for inserting bolts necessary for the sub-base 10 and the spindle motor 2.
It has reached very close to that range, and can contribute to weight reduction and downsizing.

In addition, since the sub-base 10 can be made of rough-accuracy sheet metal processing or synthetic resin molded parts, it is different from the conventional main base 1 shown in Fig. 2 above, as shown in Fig. 1. The main base 1 and sub-base 10 that are divided into two parts in the embodiment of the present invention are more advantageous in terms of cost and ease of assembly, and furthermore, it is possible to downsize the entire device. become.

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 10 and 10 may be made of sheet metal parts, and the same effects as in the above embodiment can be obtained. Also,
Needless to say, a synthetic resin molded part may be used as the sub-base 10.

[Effects of the Invention] As described above, the present invention provides a magnetic disk recording/reproducing device in which a stepping motor, a head carriage, a sensor, a spindle motor, etc. are mounted on a main base that is miniaturized in two dimensions and processed with high precision. 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, and the parts not necessary for mounting the parts are cut. As a result, it is possible to reduce the size, thickness, weight, and cost, and it is also possible to easily adjust the assembly process during production. Furthermore, it is possible to improve efficiency by shortening the assembly adjustment time. The miniaturization of the base makes it possible to reduce costs, and provides excellent effects such as being able to provide an inexpensive device without impairing the performance of conventional devices of this type.

[Brief explanation of the drawing]

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. 2 is an exploded perspective view showing the main parts of a conventional magnetic disk recording/reproducing device. In the figure, 1... Main base, 1A, 1B
...Notch, 2...Spindle motor, 3...
...Stepping motor, 3a...Screw shaft,
4...Sensor, 5...Head carriage, 5a...
...Side, 6...Guide rod, 7...Clamp,
8, 9...Bolt, 10...Sub-base.
In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A magnetic disk recording/reproducing device in which parts are arranged on a base consisting of a main base and a sub-base, wherein the main base includes a stepping motor for moving the head, and a stepping motor for moving the head. A head carriage for step feeding by the rotation of a motor and a spindle motor for rotating the disk are disposed, and the main base defines the positional relationship of the disposed parts and maintains high precision without impairing the adhesion performance between the medium and the head. 1. A magnetic disk recording/reproducing device, wherein the sub-base is formed by processing, and the sub-base is formed by processing with coarser precision than the main base. 2. A magnetic disk recording/reproducing device having a rectangular outer shape in plan view, comprising a main base having a smaller planar shape than the outer shape, and a sub-base having substantially the same planar shape as the outer shape. A magnetic disk recording/reproducing apparatus according to claim 1. 3. The main base according to claim 2, characterized in that a portion of the main base that is not involved in the mounting of parts arranged on the main base is cut out, so that the planar shape of the main base is reduced in size. Magnetic disk recording and reproducing device. 4. The magnetic disk recording/reproducing apparatus according to claim 1, wherein the sub-base is formed by sheet metal processing. 5. The magnetic disk recording and reproducing apparatus according to claim 1, wherein the sub-base is formed by molding metal or synthetic resin.