JPH0243267B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a head access mechanism for a magnetic disk device, and particularly to a magnetic head access mechanism that is simple in structure and advantageous for high-speed access.

(b) Background of the Technology Magnetic disk devices used as file devices in computer systems, etc., have become larger in size and have improved performance, resulting in higher density, larger capacity ratios, and faster speeds. Shortening the time period has become an extremely important issue. In addition, the magnetic head access mechanism that supports the magnetic head and performs the seek operation is required to have high-speed operation that can position the magnetic head with high speed and high precision with respect to the magnetic disk, so it is necessary to simplify the structure and reduce the weight. It is requested.

(c) Prior art and problems By the way, the conventional access mechanism for positioning magnetic heads in magnetic disk devices generally has three magnetic heads on one side, as shown in FIG.
A movable part for seek operation in which a plurality of support arms 2 to which are attached via support springs 4 are held, and a movable coil 5 constituting a part of a linear motor (also called a voice coil motor) is arranged on the other side. It consists of a carriage 1. The carriage 1 is mounted on a precisely machined guide rail 7 with a ball bearing 6 interposed therebetween.
The movable coil 5 is arranged so as to be movable in a straight line along the linear motor, and the movable coil 5 is inserted into a fixed magnetic circuit (not shown) that constitutes a part of the linear motor.

By supplying a drive current to the movable coil 5, which constitutes a linear motor in combination with the fixed magnetic circuit, the carriage 1 is moved linearly, and each magnetic head 3 is moved to a selected position on a corresponding magnetic disk (not shown). It is designed to perform a seek operation to the track position.

However, the above-described conventional magnetic head access mechanism is suitable for performing a seek operation by holding a large number of support arms 2, each of which is attached to a magnetic head 3 via a support spring 4. Since the linear movement of is carried out via ball bearings 5 on guide rail 7, the overall structure is quite large and complicated, and the mass of these movable parts becomes large. was.

(d) Purpose of the Invention In view of the above-mentioned conventional drawbacks, the present invention aims to reduce the weight of the carriage, which is the main body of the magnetic head access mechanism, by simplifying its structure without sacrificing its rigidity, thereby achieving high-speed access to a magnetic disk. The object of the present invention is to provide a novel head access mechanism for a magnetic disk device that is operable.

(e) Structure of the Invention According to the present invention, the carriage supporting the magnetic head function part is made of ceramic or the like and has a flat plate-like structure with guide rails provided at the upper and lower ends, and the carriage of the flat plate-like structure is A plurality of support arms each supporting a magnetic head are attached to one lengthwise end of the guide rail via a connecting plate, and the other end constitutes a part of a linear motor that moves the carriage in the lengthwise direction of the guide rail. A magnetic disk device characterized in that it is provided with a cylindrical moving coil, and that the plate-shaped carriage has a rib structure or a beam structure to improve rigidity and reduce weight. This is achieved by providing a head access mechanism.

(f) Embodiments of the invention Examples of the invention will be described in detail below with reference to the drawings.

FIG. 2 is a schematic perspective view showing one embodiment of the head access mechanism of the magnetic disk device according to the present invention, and FIG. 3 is a front view showing the moving coil of the head access mechanism of FIG. 2 attached to the corresponding fixed magnetic circuit. It is a diagram. In both of these figures, reference numeral 21 denotes a carriage structure that is a feature of the present invention, for example, guide rails 23 are provided at the upper and lower ends of a ceramic plate, and punched holes 22 are regularly bored in order to reduce the weight. It has a flat plate-like structure. As shown in the figure, a magnetic head 2 is connected to one end of the flat plate-shaped carriage structure 21 via a support spring 26.
A plurality of support arms 24 supporting 5 are attached to a connecting plate 27
installed by. Further, at the other end of the carriage structure 21, there is a movable motor which, in combination with a fixed magnetic circuit 31 consisting of a quarter-shaped iron core 32, a permanent magnet 33, a yoke 34, etc. shown in FIG. 3, constitutes a linear motor. A coil 28 is integrally attached via a support member 29.

As described above, the head access mechanism of the present invention includes:
The main carriage structure 21 has a flat plate-like structure with punched holes 22 formed in a ceramic plate, and has a rib structure partially reinforced by the support member 29, and has a ball bearing for linear movement. Due to the elimination of attachments, the overall structure is highly rigid and extremely lightweight. Therefore, as shown in FIG. 3, the movable coil 28 of such a head access mechanism is installed in the fixed magnetic circuit 31 in the carriage assembly 21 by means of a bearing 35 provided in the fixed magnetic circuit 31. When the guide rails 23 at the upper and lower ends are guided and inserted to form a linear motor with this circuit, the carriage structure 2
1 moves linearly at high speed, making it possible to accurately position each magnetic head 25 at a selected track position on the magnetic disk.

(g) Effects of the Invention As is clear from the above explanation, according to the head access mechanism of the magnetic disk device according to the present invention, the carriage structure supporting the magnetic head function part punches the hole 22a in the ceramic plate material or the like. It has a flat plate-like structure with holes, a rib structure partially reinforced by moving coil support members, etc., and the elimination of ball bearings for linear movement, resulting in high rigidity as a whole. Since it has a very light and simple structure, it can be easily miniaturized, and it has many excellent advantages, such as being able to access the magnetic disk at high speed. Therefore, it is extremely advantageous to apply it to head access mechanisms of various magnetic disk devices, especially small magnetic disk devices.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view for explaining a magnetic head access mechanism in a conventional magnetic disk device, and FIG. 2 is a schematic perspective view showing an embodiment of the head access mechanism for a magnetic disk device according to the present invention.
FIG. 3 is a front view of the moving coil of the head access mechanism of FIG. 2 attached to a corresponding fixed magnetic circuit. In the figure, 21 is a carriage structure, 22 is a punched hole, 23 is a guide rail, 24 is a support arm, 25 is a magnetic head, 26 is a support spring, 27 is a connecting plate, 28 is a moving coil, 29 is a support member, 3
1 is a fixed magnetic circuit, 32 is a quarter-shaped iron core, 33 is a permanent magnet, 34 is a cylindrical yoke, and 35 is a bearing.

Claims (1)

[Claims] 1. A carriage that supports a magnetic head functional section,
It has a flat plate structure with guide rails provided at the upper and lower ends, and a plurality of support arms each supporting a magnetic head are attached to one end of the carriage in the length direction of the plate structure via a connecting plate, and the other 1. A head access mechanism for a magnetic disk device, comprising a cylindrical moving coil forming a part of a linear motor for moving the carriage in the length direction of a guide rail. 2. The head access mechanism for a magnetic disk device according to claim 1, wherein the flat plate-like structure of the carriage has a rib configuration or a beam configuration. 3. A head access mechanism for a magnetic disk device according to claims 1 and 2, wherein the flat plate-shaped carriage is made of ceramic material.