JPH01220101A - Moving multi-track head type information recorder - Google Patents

Abstract

PURPOSE:To obtain high track density and to attain a high speed access by allocating a track group per a 1/n number of whole track number on the surface of an information recording medium with respective track corresponding parts which are provided to a multi-track head with an equal interval. CONSTITUTION:Three magnetic disks 1 are fitted to a same spindle 2, revolved and driven by a spindle motor 3. A magnetic head 4 is arranged on the front and rear surfaces of each disk 1 and four operating gaps 4a-4d for recording and reproducing, which are formed with the equal interval, are formed in one body. Each voice coil is driven and controlled by a tracking servo control circuit 6 and the gaps 4a-4d are positioned with being respectively correspondent to track groups 5a-5d. Out of the three disks 1, the 1/4 number of the one side of only one disk (only the track group 5c to be the second from an inner circumference side, for example) is obtained as an area exclusively used for a servo track and the other is wholly obtained as a data area. Thus, the high track density is obtained and the high speed access can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a moving multi-track head type information recording device, particularly, for example, to a magnetic disk in which a magnetic head having multiple gaps is relatively moved in a direction across tracks. The present invention relates to information recording devices such as recording devices.

[Conventional technology]

In conventional nuclide multi-track head type information recording devices, such as magnetic disk recording devices, the multi-gap magnetic head used is of a fixed type that cannot be moved in the radial direction of the magnetic disk. On the other hand, in the type that uses a magnetic head that is moved along the radial direction of the magnetic disk (in the direction across the tracks), a single-gap magnetic head is mounted on a carriage.

[Problem that the invention seeks to solve]

However, the former mentioned above, which uses a fixed type magnetic head, is not suitable for increasing the track density (TPI), and the latter, which uses a single-gap magnetic head, has a large number of tracks handled by the magnetic head. Therefore, there was a limit to reducing the average access time.

On the other hand, in a type of magnetic disk recording device that uses a moving magnetic head and drives multiple magnetic heads simultaneously, the entire surface of one of the magnetic disks is allocated for a servo track, This reduced the effective utilization rate of the media. As a countermeasure to this problem, a data track servo system has been proposed, but this leads to the complexity of the processing circuit.

Therefore, the technical problem to be solved by the present invention is to solve the problems of the above-mentioned prior art, and its purpose is to:
An object of the present invention is to provide an information recording device that can cope with high track density and allows high-speed access. Another object of the present invention is to provide an information recording apparatus that can reduce the servo track area of the entire recording medium and improve the effective utilization rate of the recording medium surface.

(Means for Solving the Problems) The above-mentioned object of the present invention is to provide a multi-track head that moves relatively in a direction across tracks on an information recording medium, and a multi-track head that is formed at equal intervals on the multi-track head. is an integer of 2 or more) and a track corresponding section having at least a reproduction function, and each track corresponding section is in charge of a group of tracks of 1/n of the total number of tracks on one side of the information recording medium. This is achieved by a moving multi-track head type information recording device.

Further, according to the present invention, at least one of the track corresponding parts is dedicated to tracking servo.

[Effect]

The present invention is as described above, and each of the head-corresponding parts of the multi-track head only needs to move a number of consecutive track areas of 1/n of all the tracks on one side of the information recording medium. As a result, the moving distance of the head can be significantly reduced, and the average access time can be dramatically shortened. Furthermore, since the respective head corresponding parts of the multi-track head are spaced apart by 1/n of the total number of tracks, fine processing and integration are possible and it is possible to easily cope with high track density.

Furthermore, in an information recording device that uses multiple recording media, if only an area L/n of all tracks on one side of a specific recording medium is dedicated to tracking servo, tracking will be performed on all recording media. Servo can be performed, the data area can be increased, and the effective utilization rate of the recording medium surface can be improved.

〔Example〕

The present invention will be explained below with reference to one embodiment shown in FIGS. 1 to 3.

In FIG. 3, reference numeral 1 denotes a magnetic disk. In this embodiment, three magnetic disks 1 are attached to the same spindle 2, and are rotationally driven by a spindle motor 3. Each magnetic disk 1 has a diameter of 2.5
inch, 256 tracks on one side, track density of IKtDi, and rotated at 1200 rpm.

4 is a multi-gap magnetic head shown in FIG. 1, which is disposed on the front and back sides of each magnetic disk 1, and each head or a pair of front and back sides, although it is simplified in FIG. 3, is composed of a voice coil. The actuator moves the magnetic disk 1 by a predetermined amount in the radial direction of the magnetic disk 1 (in the direction across the tracks).

Each of the magnetic heads 4 has four recording/reproducing operations (
[Air] The gaps 4a to 4d are integrally formed, and the distance between each working gap is set to about 1.6 mm, and the total width is set to about 6 mm. Each of the voice coils is driven and controlled by a tracking servo control circuit 6 to correctly position each operating gap 4a to 4d on a desired track.

Each of the working gaps 4a to 4d of the magnetic head 4 is adapted to take charge of 1/4 of the total number of tracks on each surface of the magnetic disk 1, that is, 64 tracks in this embodiment. As shown in Figure 2, magnetic disk 1
Continuous track groups 54 to 5d of 64 tracks above
Each of the working gaps 44 to 4d is positioned corresponding to each of the working gaps 44 to 4d. One side of one of the three magnetic disks 1 (for example, the bottom magnetic disk 1 in FIG.
Only 1/4 of the number of tracks (for example, the second track group 5C from the inner circumferential side in FIG. 2) of the lower surface of the servo track is designated as a servo track exclusive area, and the rest are all data areas. That is, only 64 tracks out of the total number of 256x6 tracks on the three magnetic disks are used as the servo track area, and the data area is increased as much as possible to improve the effective utilization rate of the disk surface. There is.

In the configuration of the embodiment described above, the magnetic head 4 is made of, for example, a thin film magnetic head, and the operating gaps 4a to 4d of fine width corresponding to high track density are formed at equal intervals with desired accuracy. (by providing a tunnel erase gap on both sides of the recording/reproducing gap if necessary), the head is fixed to a known floating type head support, and floats a minute distance from the magnetic disk 1 as the magnetic disk 1 rotates. ing. Then, by the access signal,
The tracking servo control circuit 6 drives the voice coil based on a servo information read signal of one operating gap (for example, 4C) of a specific single magnetic head 4 corresponding to the servo track area, and each magnetic head 4 The respective operating gaps 4a to 4d are positioned on desired tracks, and magnetic information (data) is recorded or reproduced. In other words, if the alignment accuracy between each magnetic head 4 is adjusted correctly, since each magnetic head 4 is of a multi-gap type, 174 of one of the six disk surfaces can be used as a servo track area. , tracking servo will be performed reliably.

In this embodiment, the amount of movement of the magnetic head 4 is
1/1 compared to one using a single gap magnetic head
4 (because the average access distance can be about 0.5 mm), the average access time is about 10 mm5
ec, the average waiting time can be reduced to 4.2mm5ec. On the other hand, when a single gap magnetic head is used, the average access time is about 25 mm5ec, and the high speed access achieved by the embodiment is remarkable. Also, in the examples. The data storage capacity of the entire device is approximately 15M.
On the other hand, if one side of one of the magnetic disks 1 is used as a servo track area, the data storage capacity will be approximately 13 MB, and it is clear that the effective utilization rate of the disk surface is increased by the embodiment.

Note that in the embodiment described above, the magnetic disk 1 is
Although the magnetic disks 1 are shown as having four working gaps, the number of magnetic disks 1 can be arbitrary, and the number of working gaps can also be selected as an arbitrary integer of 2 or more. In addition, recording media other than magnetic disks, such as magnetic tape devices,
The present invention can also be applied to magnetic card devices, and in some cases, the present invention can also be applied to information recording devices other than magnetic recording devices, such as optical recording devices.

〔Effect of the invention〕

As described above, according to the present invention, an information recording device capable of high track density and high speed access can be provided. Furthermore, the servo track area of the entire recording medium can be reduced, and the effective utilization rate of the recording medium surface can be increased, which is of great value in this type of information recording apparatus.

[Brief explanation of the drawing]

The drawings all relate to one embodiment of the present invention; FIG. 1 is an explanatory diagram showing a multi-gap magnetic head, FIG. 2 is an explanatory diagram showing a magnetic disk, and FIG. 3 is a simplified diagram of a magnetic disk recording device. It is an explanatory diagram. l...magnetic disk, 2...spindle, 3...spindle motor, 4...
6H air head, 4a to 4d...operating gap,
5a to 5d...Track group, 6...Tracking servo control circuit.

Claims (2)

[Claims] (1) A multi-track head that relatively moves in a direction across tracks on an information recording medium, and n (n is an integer of 2 or more) tracks formed at equal intervals on the multi-track head and having at least a reproduction function. a moving multi-track head type, characterized in that each track corresponding section is in charge of a group of tracks each having 1/n of the total number of tracks on one side of the information recording medium. Information recording device. (2) A moving multi-track head type information recording apparatus according to claim (1), wherein at least one of the track corresponding parts is dedicated to tracking servo.