JPS6052967A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To increase the number of tracks and to increase the recording capacity by a simple structure, by winding a metallic bond onto a pulley of a carriage driving motor by two rotations or more. CONSTITUTION:A metallic band 31 is wound without a gap to a pulley 16 by a spring part 22, and when the pulley 16 rotates in the direction 32, a carriage moves in the direction 33. In this case, the metallic band 31 is wound onto the pulley 16 by two times, therefore, such a phenomenon as the metallic band 31 is not detached from th pulley 16 by a metallic band fixing screw 21 by one rotation is not generated, and the rotation can be executed by another rotation or so. Also, a metal reinforcing plate 25 is placed so that it is not protruded to the outside from the outside diameter of the pulley, so as not to hit against the carriage. Also, a part for escaping from a head part of the screw is provided on the metallic band so that it does not hit against the fixing screw 21. In this way, the recording capacity can be increased by a simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording device. More specifically, the present invention relates to a magnetic recording apparatus having a mechanism for converting the rotational motion of a drive motor for fully driving a carriage carrying a magnetic head and moving in the radial direction of a recording medium into the motion of the carriage through a metal band.

With the improvement of magnetic recording technology, the recording density per surface of a recording medium is increasing at a rate of about 10 times every 10 years. Currently, magnetic recording devices are supported by such advances in magnetic recording technology, and the development of high-capacity devices that can obtain many times the storage capacity with the same volume as conventional devices, and vice versa. Progress is being made in the development of compact devices with a fraction of the cost.

In particular, magnetic recording devices, in which the magnetic head moves in the radial direction of the recording medium to perform recording and reproduction, are increasingly being used in small offices and
Computers and A u-enabled personal computers,
BACKGROUND ART Miniaturization and commercial capacity are being promoted as external storage devices for word processors and the like.

As described above, there are two ways to increase the total areal recording density: one is to increase the linear recording density by 710'r, and the other is to increase the number of tracks per surface. However, in the former method, even if the linear recording density is increased by zero due to a reduction in the recording medium diameter, the data transfer speed must be kept the same in order to ensure compatibility with conventional storage devices. Therefore, the current situation is that the linear recording density has not been improved in a positive sense. The latter method of increasing the number of tracks is effective because compatibility with conventional magnetic storage devices is not lost. In this way, in a magnetic recording device having a mechanism (so-called actuator) that moves the entire magnetic head in the radial direction of the recording medium, such as a stepping motor as a total drive source, in order to increase the total number of tracks as described above,
Efforts are being made to improve the positional accuracy of the actuator and increase the track density. Some storage devices write track positioning signals on the recording medium, thereby achieving a high track density.

FIG. 1 shows a conventional actuator mechanism having a carriage 16 on which a magnetic head 11 is mounted and which moves in the radial direction of a recording medium 120. As shown in FIG. Reference numeral 14 denotes a motor for driving the carriage 13, and a metal band 17 wound around a pulley 16 attached to a rotor shaft 15 converts the rotational motion of the drive motor into @line motion of the bv carriage 13. As shown in the detailed diagram of the conventional carriage galley section in Figure 2, the drive motor is used to drive the actuator of small external storage devices such as small office computers and high-performance personal computers. There are many oven loop type devices that use a stepping motor as the motor and do not use servo. A small storage device using such a stepping motor can be used to create a track 'P.
1. There is one problem when trying to increase the total amount. for example,
When a stepping motor with a step angle of 1.8 degrees is used as a drive motor, in two-phase drive and one-phase drive, if the number of tracks is 200 or more, the motor must make one rotation or more.

FIG. 1 shows a complete example of a mechanism for converting the rotational motion of a motor into the motion of a carriage using a metal band, which has been commonly used in the past, and this example will be described in detail.

The stepping motor 14 is used as a driving motor, and the carriage 13 to which the magnetic head 11 is attached is connected to the metal band 1.
7 in the radial direction of the recording medium. Figure 2 shows a detailed diagram.

A metal band 17 is attached to a pulley 16 attached to a rotor shaft 15 of a stepping motor shaft 14 by a fixing screw 21, and the metal band 17 is attached by being wrapped around the pulley once. 22 is a spring for pulling the metal band, and is fixed on the carriage 13 with a screw. When the drive motor l1I115 rotates in the direction of arrow 23, the pulley 16 also rotates in the same direction, so the carriage moves in the direction of arrow 24 via the metal band 17 attached to the boot 11. . The gear ridge drive mechanism as described above has a simple structure and is capable of highly accurate positioning, so it has been used in many magnetic recording devices. However, as described above, when attempting to expand the recording area, since the metal band is fixed on the pulley by the metal band fixing screw 21, it is structurally impossible to move the boot 11-1 by more than one rotation. Furthermore, since there is a plate 25 for reinforcing the metal band, etc., the effective travel distance is reduced to only 8 side angles per rotation due to contact with the carriage.

The present invention eliminates such drawbacks and proposes a mechanism that uses a metal band to convert the rotation of a drive motor into movement of a carriage, in which the carriage can move even if the drive motor rotates more than once. be.

FIG. 3 shows a concrete example of the carriage moving mechanism according to the present invention, in which a metal band 31 attached to a boot IJ-16 is wound twice around a pulley. If the structure is as shown in the figure, the main spindle motor will not be able to rotate because the metal band reinforcing plate hits the carriage.
．． It can rotate about 8 times. In other words, if a stepping motor with a step angle of 1.8 degrees is used as a conventional drive motor, even if the total track density is increased, it will be approximately 1.
Whereas only about 60 tracks could be recorded, if the metal band mechanism according to the present invention is used, about 560 tracks can be installed on the recording medium. The moving method will be explained in detail. In reality, the metal band 31 is wound tightly around the pulley by the spring portion 22. When the pulley rotates in the 32 direction, the carriage moves in the 36 direction via the metal band 61. At this time, as mentioned above, the metal band is wrapped twice on the pulley, so 1
During rotation, the dimetal band does not separate from the pulley due to the metal band fixing screw, and the metal band can be rotated nearly one more turn in the groove where the part where the metal band is fixed appears.

At this time, make sure that the metal band reinforcing plate 25 does not hit the carriage and do not protrude beyond the outside diameter of the pulley, or chamfer the reinforcing plate so that the metal band wraps around the pulley smoothly. .

Furthermore, it is necessary to bend the reinforcing plate to match the curvature of the boob. Alternatively, the carriage side in contact with the reinforcing plate 25 may be ground. To avoid hitting the fixing screw, you must provide a part to escape the head of the metal screw.

The problem with the mechanism described above is that when the metal band is wound on the pulley once and when it is wound on the second rotation, the diameter of the pulley increases by the thickness of the metal band during the second rotation. That is what I have done. However, the metal band is quite thin compared to the pulley diameter. If the thickness of the metal band used is all the same, there will be no problem as there will be compatibility with other magnetic recording devices. Especially in fixed disk devices where the recording medium is not replaced,
This is considered to be optimal because it has the property that the track pitch can change somewhat as long as the track position is reproducible.

Further, the difference between the amount of winding and separation of the metal band due to the difference in pulley diameter is absorbed by the spring 22.

Furthermore, by wrapping the metal band around the pulley for two or more full rotations, it becomes possible to convert the entire rotation of one drive motor into movement of the carriage for two or more rotations.

As mentioned above, there are two metal bands on the pulley.
With the simple structure of more than one rotation, the recording area on the recording medium, in other words, the number of tracks, can be increased, and the recording capacity can be increased.

This is considered to be particularly effective in fixed disk devices in which the recording medium is not replaced. The machine according to the present invention can also be applied to a magnetic recording device that uses a rotary arm actuator mechanism to convert the rotation of a motor into the rotation of an arm via a null band.

[Brief explanation of drawings]

Fig. 1...Reservoir 2 showing a conventional actuator mechanism...Details of a conventional carriage drive section Fig. 3...Fig. 11 showing a specific example of a carriage drive mechanism according to the present invention... Magnetic head 12... Recording medium 13... Carriage 14... Carriage drive motor 15... Rotor shaft 16... Boot 11-17... Metal band 21... Fixing screw 22... Metal band Spring 23 for pulling...
Motor rotation direction 24... Carriage movement direction 25... Reinforcement plate 31... Metal band 32 wrapped around twice...
・Boot rotation direction 63... Carriage movement direction or more Applicant Suwa Seikosha Co., Ltd. Agent Mogami Patent Attorney Figure 1 Figure 2

Claims (1)

[Claims] A carriage that moves in the radial direction of the recording medium, which is equipped with a recording medium, a magnetic head that performs all recording and reproduction, and a motor that drives the carriage. In a magnetic recording device having a mechanism for converting a metal band wrapped around a pulley into a motion of a carriage, the metal band wrapped around the boo 11- is wound at least twice on the pulley. magnetic recording device.