JPS62223874A - Recording and reproducing device for magnetic disk - Google Patents

Abstract

PURPOSE:To cushion the vibration and impact given from the external part by fitting a main base via the buffer material subjected to a bushing to the sub-base having about the same dimension with those of the device planely and worked in a rough accuracy. CONSTITUTION:A main base 1 is fitted to the sub-base 11 having about the same dimension with those of the device planely and being worked comparatively rough in its accuracy, for instance subjected to a sheeting or synthetic resin forming, and the cushion 12 with a spacer is subjected to a bushing at the fitting part engaging with the main base 1 of the sub-base 11. The composition is made by fitting with a nut 13, etc. through the cushion 12 with a spacer a bolt 10 which is subjected to a bushing to the main base 1 and sub-base 11.

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, l denotes a main base that is approximately the same size in plan as the main body of the magnetic disk recording/reproducing device, and on this main base 1 is a spindle motor 2 (not shown) that rotates a magnetic disk medium. , a stepping motor 3 (not shown) for moving the head, 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. Side surface 5a of head carriage 5
is engaged with the screw shaft 3a of the stepping motor 3, and the rotation of the stepping motor 3 causes the head carriage 5 to be moved step by step.

In recent years, magnetic disk recording and reproducing devices have become increasingly smaller and thinner, and at the same time, the recording capacity has also tended to increase.Meanwhile, the magnetic properties of magnetic disk media have also been improved, resulting in higher performance and higher density. Along with this, magnetic disk recording and reproducing devices are also required to have a high track pitch, and the demand for high precision is also increasing, while on the other hand, the market demand for lower costs is also increasing.

In addition, the material of the magnetic disk medium (well, a magnetic layer of about 1 to 13 μm coated on the surface of the base film, which expands and contracts freely depending on the humidity and changes in humidity. The main base 1, which constitutes the magnetic disk recording/reproducing device, is processed with high precision using a material such as aluminum cast material, which has a thermal expansion coefficient of approximately the same order as that of the magnetic disk medium. Therefore, the cost of the main base 1 is extremely high.Furthermore, the spindle motor 2 that rotates the magnetic disk medium is required.
High precision is also required to prevent center runout.・Stepping motor which is the system for positioning the rad 3.
・＼Rad Carriage 5. As for the guide rod 6, it goes without saying that the material selection and processing accuracy should be improved in the same way.

[Problems that the invention attempts to resolve] In the conventional magnetic def disk recording/reproducing device as described above, the main base 1 is approximately the same size as the device in plan view. , smaller and thinner.

This has become an impediment to weight reduction and cost reduction.
In addition, because the ends of the parts that make up the device are mounted on the main base 1, which is machined with high precision, there are problems such as the fact that assembly and adjustment during production takes a very long time. was there.

This invention was made in order to solve these problems, and it is possible to reduce the size, thickness, weight, and cost, as well as reduce the time t (δ) for assembly and adjustment during production, and improve economic efficiency. The purpose is to obtain a good magnetic disk recording and reproducing device.

[Means for solving problems]

The magnetic disk recording/reproducing device according to the present invention has a stepping motor that moves a head, which is a main component that requires high precision, on a main base that has a minimum planar dimension and shape and is machined with high precision. , main parts such as a head carriage that is moved 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 base is made to have approximately the same size as the device in plan view. It is attached to a sub-base machined with rough precision via a cushioning material made of bushings.

[Effect]

In the magnetic disk recording/reproducing device of the present invention, the main base has the minimum size and shape with the main parts attached, and the minimum volume to improve processing accuracy, in order to make the entire device smaller and thinner. The overall characteristics can be determined by assembling the main base, and by making the sub-base approximately the same size as the device in plan view, this sub-base can be used for external attachment, etc. Install components that do not require relatively high 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 rotation of the stepping motor 3, and sensors 4 such as a TKOO sensor for positioning the head are attached. On the main base 1, as in the conventional example shown in FIG. A carriage 5 is movably attached. 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 rad carriage 5 to move 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 machined with high precision. is attached to a sub-base 11 that has approximately the same dimensions as the device in plan view and is relatively roughly machined in terms of accuracy, such as sheet metal processing or synthetic resin molding, but the sub-base A cushion 12 with a spacer is attached to the mounting portion connected to the main base l of 11.

As shown in FIG. 2, bolts 10 are pushed into the main base 1 and the sub-base 11, and are attached to the bolts 1 to 13 through the bolts 12 with spacers.

In the magnetic disk recording/reproducing device constructed in this way, the main base 1, which requires high-precision machining, can be made smaller and lower in cost. , stepping motor 3
Since main parts such as , sensor 4, l\head caliper position 5, and guide rod are attached, it is easy to adjust after assembly and ensure high accuracy.Also, the adjustment time can be shortened, making it economical. There are also some effects.

In addition, since the sub-base 11 can be made of rough-accuracy sheet metal processing or synthetic resin molded parts, compared to the conventional main base 1 shown in FIG.
The main base 1 and sub-base 11 that are divided into two 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 11 and 11 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 a synthetic resin molded part may be used as the sub-base 11.

〔Effect of the invention〕

As explained above, this invention is a magnetic disk recording/reproducing device in which a stepping motor, a head carriage 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.

! i! In addition to being able to quantify and reduce costs, it is also possible to easily adjust the assembly process during production. Furthermore, it is possible to improve efficiency by shortening assembly adjustment time, and furthermore, it is possible to reduce costs by downsizing the main base. In addition, the main base and sub-base have a cushioning effect against vibrations and shocks from the outside of the device, making it possible to improve the performance of conventional devices and provide inexpensive devices. This is to reduce the effect of the war.

[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 a mounting section in 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 Crane, 8.9, 10
Bolt, 11 Sub base, 12 Cushion with spacer, 13 Nut. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In a magnetic disk recording/reproducing device, main components such as a stepping motor that moves the head, a head carriage that moves the head in steps by rotation of the stepping motor, a sensor that positions the head, and a spindle motor that rotates the disk are arranged in a two-dimensional manner. It is installed and adjusted on a main base that has minimum dimensions and shape and is machined with high precision, and this main base has dimensions that are approximately the same size as the device in plan view and is machined with rough precision. 1. A magnetic disk recording/reproducing device, characterized in that the sub-base is attached to a main base, and a cushion with a spacer is bushed in a mounting portion of the sub-base that engages with the main base to provide a cushioning effect.