JPH04366474A - Magnetic recorder/reproducer - Google Patents

Abstract

PURPOSE:To enhance a density of a track and to improve reliability by eliminating a thermal offtrack occurring due to a thermal expansion difference caused by a difference of materials of a magnetic disk disposed in a housing and a material of a head support member provided planely with a plurality of magnetic heads in a recorder/reproducer such as a fixed magnetic head type magnetic disk apparatus, etc. CONSTITUTION:A head support member 14 in which a plurality of magnetic head elements 15 are so planely provided as to correspond to record tracks on a recording surface, is disposed oppositely on the recording surface of a magnetic recording medium 11 mounted on a rotary spindle 12. In this magnetic recorder/reproducer, the member 14 as a thermal expansion coefficient equivalent to that of a base material of the medium 11, and fixed near the spindle 12 to be provided in a fixed state to the medium 11.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording and reproducing device, and more particularly to a magnetic recording and reproducing device such as a fixed magnetic head type magnetic disk device or a floppy disk device.

In recent years, as electronic computers have become smaller and more portable, there has been a demand for smaller magnetic recording/reproducing devices, such as magnetic disk devices, higher recording density, and shorter access times.

0003

2. Description of the Related Art Conventional general magnetic disk drives include a magnetic disk mounted on a rotating spindle via a hub mechanism, and a recording/recording disk supported by a tracking actuator via a support arm for the magnetic disk. A reproducing magnetic head, etc. is housed in a sealed housing, and the tracking actuator is driven to position the magnetic head at a selected recording track position on a rotating magnetic disk surface, thereby recording and reproducing information. ing.

[0004] The miniaturization of such magnetic disk drives is achieved by miniaturizing the component parts, but it is also possible to miniaturize the device only by miniaturizing the component parts without reducing the number of component parts. There are limits. In addition, because one or two magnetic heads seek all the recording tracks on the magnetic disk surface and record/playback is performed on the selected recording track, the seek operation takes time, so the seek time is There is a demand for a reduction in

[0005] Therefore, in order to solve such problems,
A magnetic disk mounted on a rotating spindle and a head support member fixedly disposed opposite the recording surface thereof and having a plurality of magnetic heads provided in a plane so as to correspond to each recording track on the recording surface. A fixed magnetic head type magnetic disk device in which a head disk assembly is housed in a sealed housing has been proposed.

[0006]

[Problems to be Solved by the Invention] However, in the conventional fixed magnetic head type magnetic disk device described above, one magnetic head corresponds to each recording track on the magnetic disk surface. Since the seek operation time is greatly shortened and a tracking actuator or the like is not required, it is extremely advantageous for downsizing the device.

However, in such a magnetic disk device, due to temperature changes (temperature rise) inside the housing during operation, the material of the magnetic disk base material and the head support member on which a plurality of magnetic heads are provided in a flat manner may deteriorate. There is a problem in that thermal off-track (misalignment between the recording track and the magnetic head due to thermal expansion) occurs due to the difference in coefficient of thermal expansion, making it difficult to achieve high density recording, especially high track density.

In view of the above-mentioned conventional problems, the present invention solves the problem of thermal expansion coefficient due to the difference in material between the base material of the magnetic disk disposed in the housing and the head support member on which a plurality of magnetic heads are provided in a planar manner. It is an object of the present invention to provide a compact magnetic recording/reproducing device that eliminates thermal off-track caused by the difference in magnetic field and has high track density and improved reliability.

[0009]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a magnetic recording medium which is arranged to face the recording surface of a magnetic recording medium mounted on a rotating spindle and to correspond to each recording track on the recording surface. In a magnetic recording and reproducing device, a head support member having a plurality of magnetic head elements arranged in a plane is disposed, and the head support member has a coefficient of thermal expansion equivalent to that of the base material of the magnetic recording medium, and has a rotary spindle. One end is fixed to a fixing member near the magnetic recording medium, so that it is fixed to the magnetic recording medium.

[0010] Also, a stator corresponding to a rotor of a drive motor of the rotary spindle is provided on a fixing portion that fixes the head support member to the fixing member.

[0011]

[Operation] In the present invention, the thermal expansion coefficients of the magnetic recording medium mounted on the rotating spindle and the head supporting member on which a plurality of magnetic head elements are provided in a plane are equalized, and the head supporting member is attached to the rotating spindle. By fixing in the vicinity,
The thermal expansion of the magnetic recording medium in the radial direction from the rotating spindle and the head support member in the same direction from the fixed part are approximately equal, and thermal off-track due to temperature changes (temperature rise) in the housing during operation of the device is prevented. It is automatically corrected and can be significantly reduced.

[0012] Further, the stator constituting the drive motor of the rotary spindle is provided on a fixed part that fixes the head support member to the fixed member, and a rotor is provided on the rotary spindle side correspondingly. The volume occupied by the drive motor within the device can be reduced, thereby making it possible to further downsize the device.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side sectional view of a main part showing a first embodiment in which a magnetic recording/reproducing device according to the present invention is applied to a magnetic disk device.

In the figure, reference numeral 11 denotes a magnetic disk mounted on a rotating spindle 12 connected to a drive motor 13 via a hub mechanism (not shown). The magnetic recording layer 14 has a structure in which a magnetic recording layer is deposited thereon, and the same number of planar thin film magnetic head elements 15 are connected to the magnetic head 14 so as to correspond to each recording track on the recording surface of the magnetic disk 11. The base material of the disk 11, i.e.
The head support member is formed and disposed planarly on a support substrate made of aluminum, glass, etc., which has the same coefficient of thermal expansion as the nonmagnetic substrate and has the same disk shape.

The head support member 14 faces the recording surface of the magnetic disk 11 with a predetermined minute gap therebetween, and is mounted near the rotating spindle 12 by a fixing member 16 as shown in the figure. These are housed in a sealed housing 17.

Therefore, in the configuration of this embodiment, the magnetic disk 11 and the head support member 14 have the same coefficient of thermal expansion, and since both are fixed at the rotating spindle 12 and its vicinity, the magnetic The thermal expansion of the disk 11 and the head support member 14 from the rotary spindle 12 side toward the outer circumference is approximately equal, and even if the temperature inside the housing 17 changes during operation of the device, thermal off-track is automatically corrected. This makes it possible to significantly reduce this.

FIG. 2 is a sectional side view of a main part showing a second embodiment in which the magnetic recording/reproducing device according to the present invention is applied to a magnetic disk device, and the same parts as in FIG. 1 are given the same reference numerals. did.

The difference between the embodiment shown in this figure and the first embodiment shown in FIG. A head support member 21 in which the same number of planar thin film magnetic head elements 15 are disposed in a plane.
The shape of the magnetic disk 11 is, for example, a semi-disc shape of 1/2, or a sector shape of 1/3, 1/4, etc.
The head support member 21 faces the recording surface of the magnetic disk 11 with a predetermined minute gap therebetween, and is fixedly arranged near the rotating spindle 12 by a fixing member 22 as shown.

The configuration of this embodiment also provides the same effects as the first embodiment shown in FIG. 1. Further, FIG. 3 is a side sectional view of a main part showing a third embodiment in which the magnetic recording/reproducing apparatus according to the present invention is applied to a magnetic disk device, and the same parts as in FIG. 1 are given the same reference numerals.

The embodiment shown in this figure is different from the first embodiment shown in FIG.
A head support member 14 in which the plurality of planar type thin film magnetic head elements 15 are disposed in a plane is disposed on a fixed part fixed to a fixed member 16, and a rotor is provided on the rotating spindle 12 side correspondingly. 32 is arranged.

The structure of this embodiment also provides the same effects as the first embodiment shown in FIG. Since it consists of 12 drive motors, the number of component parts can be reduced,
The volume occupied by the drive motor within the housing 17 is significantly reduced, thereby making it easier to make the device more compact.

[0022] In the above embodiments, an example in which the present invention is applied to a magnetic disk device has been described, but the essence of the present invention is not limited thereto, and can also be applied to, for example, a floppy disk device. Needless to say.

[0023]

[Effects of the Invention] As is clear from the above explanation, the fixed magnetic head type magnetic recording/reproducing apparatus according to the present invention has the following advantages:
Even if the temperature inside the housing 17 changes during operation of the device, thermal off-track is automatically compensated and significantly reduced, improving track density and reliability, and
This has excellent practical effects, such as being able to realize a smaller and cheaper magnetic recording/reproducing device by reducing the number of component parts.

[Brief explanation of drawings]

FIG. 1 is a sectional side view of a main part of a first embodiment in which a magnetic recording/reproducing device according to the present invention is applied to a magnetic disk device.

FIG. 2 is a side sectional view of a main part showing a second embodiment in which the magnetic recording/reproducing device according to the present invention is applied to a magnetic disk device.

FIG. 3 is a side sectional view of a main part showing a third embodiment in which the magnetic recording/reproducing device according to the present invention is applied to a magnetic disk device.

[Explanation of symbols]

11 Magnetic disk 12 Rotating spindle 13 Drive motor 14, 21 Head support member 15 Thin film magnetic head element 16, 22 Fixed member 17 Housing 31 Stator 32 Rotor

Claims (2)

[Claims] 1. A plurality of magnetic head elements (15) are arranged to face the recording surface of a magnetic recording medium (11) mounted on a rotating spindle (12) and correspond to each recording track on the recording surface. ), the head supporting member (14) has a coefficient of thermal expansion equivalent to that of the base material of the magnetic recording medium (11), and rotating spindle (12)
A magnetic recording/reproducing device characterized in that one end of the magnetic recording medium (11) is fixed to a fixing member (16) near the magnetic recording medium (11). 2. The rotary spindle (
2. The magnetic recording and reproducing apparatus according to claim 1, further comprising a stator (31) corresponding to the rotor (32) of the drive motor of claim 12).