JPS6161277A - Arm for positioning carriage of magnetic disk device - Google Patents

Abstract

PURPOSE:To lower a vibrating level of a resonance frequency, to make easy the control of a servo and to position a magnetic head effectively and stably by filling a resin in a rib of an arm with a rib supporting the magnetic head. CONSTITUTION:An arm 2 to which a magnetic head 6 is attached rotates centering a rotating shaft 5 supported through a bearing 10 by a housing 1. According to a calling, writing instructions, the arm 2 is rapidly moved, the arm 2 produces an up-and-down vibration and a twisting vibration. Then, a position change between information positions of the magnetic head 6 and a magnetic head 7, that is, an off-track is produced, but a damping force of a resin 9 filled in the rib of the arm reduces the vibration of the arm 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an arm for a positioning carriage used in a magnetic disk drive.

[Conventional technology]

In general, in a movable head type magnetic disk drive, as soon as there is a request to read specific information on the magnetic disk, the movable head must rapidly position itself in the radial direction of the magnetic disk so as to minimize the read time. .

FIG. 3 (2), ■) shows a plan view and a front view of a conventional carriage. For example, in the case of a rotary type magnetic disk device, the magnetic head 6 is attached to the arm 2, and the arm 2 is attached to the housing l. The magnetic head 6 is brought to an appropriate position on the magnetic disk 7 by rotating around a rotating shaft 5 provided on the shaft 8, and as the magnetic disk 7 rotates around the shaft 8, magnetic data is written. Perform reading. A coil 4 is attached to the arm 2.
By applying a current K, a force is generated between the permanent magnet 3 and the coil 40, which causes the arm 2 to rotate. Positioning of the magnetic spatula 6 is generally controlled by a servo circuit system forming a closed loop of magnetic head position detection → voice coil sensor control circuit → voice coil motor coil energization → coil movement → magnetic head movement → magnetic head position detection. .

[Problems to be solved]

In the prior art, when the magnetic head 6 moves rapidly in response to a command such as a call, the resonance frequency becomes a problem in the servo loop as described above. If the resonance frequency is too low or the vibration level is too high, the servo system will resonate, making accurate positioning impossible.

In the past, the recording density of the magnetic disk 7 was low and there was sufficient margin for reading and writing information, but as storage density and capacity have increased in recent years, there is no margin for reading and writing information, and the resonance Either the frequency needs to be increased or the vibration level needs to be reduced.

That is, the present invention lowers the vibration level of the resonant frequency by filling the ribs of the ribbed arm that supports the magnetic head, making it easier to control the servo system, and ensuring reliable and stable positioning of the magnetic head. It has been made possible to do so.

[Means for solving problems]

The present invention has solved the above problems, and is characterized in that, in a positioning carriage for a magnetic disk device, which has a magnetic head and a ribbed arm that supports the magnetic head, the ribs of the arm are filled with resin. That is.

〔Example〕

Next, one embodiment will be described with reference to FIGS. 1 and 2.

Fig. 1 is a longitudinal sectional view of the carriage to which the positioning carriage arm of a magnetic disk drive according to the present invention is applied, and Fig. 2 shows the servo system when using the conventional arm and when using the arm according to the present invention. FIG. 3 is a diagram showing a comparison of frequency characteristics.

In FIG. 1, l is a housing, and 11 is a magnetic circuit consisting of a permanent magnet 3 and a coil 4. Reference numeral 12 denotes an arm operated by a magnetic circuit 11, and a magnetic head 6 is attached to this arm 2.

This arm 2 rotates around a rotating shaft 5 that is supported on a housing 1 via a bearing 1O.

7 is a magnetic disk, and 9 is a resin filled in the ribs of the arm 2.

Next, its operation will be shown. When the arm 2 moves rapidly in response to a call or write command, the arm 2 causes vertical and torsional vibrations due to the excitation force. This causes a mutual positional change between the magnetic head 6 and the information position of the magnetic disk 7, that is, off-track.

However, since the resin 9 is filled in the ribs of the arm 2, the vibration energy of the arm 2 is transmitted to the resin 9 and converted into thermal energy within the resin, so that the vibration energy becomes small. That is, the vibration of the arm 2 is reduced by the damping force of the resin 9.

In FIG. 2, the frequency characteristic of the servo system using the conventional arm 2 is shown by curve 2', and the frequency characteristic of the servo system when arm 12 according to the present invention is used is shown by curve 12'. According to this, it can be seen that the vibration level is reduced when the arm 12 according to the present invention is used.

Therefore, by filling the ribs of the arm 12 with the resin 9, the resonance level of the servo system in the positioning mechanism of the magnetic head 6 of the magnetic disk device is lowered, the control of the servo system is facilitated, and the magnetic head 6 is reliably operated. Moreover, stable positioning can be performed.

〔Effect of the invention〕

As explained above, in the present invention, since the ribs of the ribbed arm supporting the magnetic head are filled with resin, the vibration level of the resonance frequency is lowered, and the control of the servo system is facilitated.
This has the effect of ensuring reliable and stable positioning of the magnetic head.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a magnetic disk drive positioning carriage arm according to the present invention, and FIG. 2 is a servo system diagram using a conventional arm and an arm according to the present invention. A diagram showing a comparison of frequency characteristics, FIG. 3 (4). (B) is a plan view of a magnetic disk device to which a positioning carriage arm of a conventional magnetic disk device is applied;
It is a front view.

Claims (1)

[Claims] In a positioning carriage for a magnetic disk device having a magnetic head and a ribbed arm supporting the magnetic head,
An arm for a positioning carriage of a magnetic disk device, characterized in that a rib of the arm is filled with resin.