JPS62222461A - Information recording and reproduction device - Google Patents

Abstract

PURPOSE:To obtain the interchangeability in recording and reproducing of higher accuracy than in the past by approximately letting the arranging direction of the means supporting movably either a recording medium or recording and reproducing head coincide with the inside of the plane including the rotary shaft of the recording medium. CONSTITUTION:A magnetic disk 1 is driven by being rotated at the prescribed speed by the rotary center shaft. A magnetic head 2 is then slid from the lower face of the magnetic disk 1, so a carriage 3 is supported so as to move in parallel within the plane in parallel to the disk at the lower side than the magnetic disk 1. The supporting part 3b of a box structure is integrally formed at the upper part of the carriage 3, the center part of the supporting part 3b becomes a hollow part 3d and bearings 3e, 3e are provided on the wall face before and behind the carriage formed by this hollow part 3d. These bearings 3e support the carriage 3 on a screw rod 4, which is supported freely rotatably via bearings 9a, 9a to the screw brackets 9, 9 being fixed to the chassis, etc., of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information recording and reproducing device, and particularly to an information recording and reproducing device that records and reproduces information in different areas of a recording medium by relative movement of a recording medium and a recording and reproducing head. It is something.

[Prior art] The above configuration has been conventionally implemented in optical disk devices, floppy disk devices, and the like.

For example, in a floppy disk device, the above-mentioned relative movement is performed by a mechanism as shown in FIG. In FIG. 3, reference numeral 1 denotes a flexible or rigid magnetic disk, which is rotated at a predetermined speed by a driving means (not shown). In many conventional devices, QIj
The magnetic disk l as an N body is rotationally driven by a fixed center of rotation, and a magnetic disk 2 that is in contact with the magnetic disk l is moved along the radius of the magnetic disk 1 to perform different information tracks on the magnetic disk l. I am trying to record and play.

The magnetic helad 2 is attached to a carriage 3, and the carriage 3 is slidably supported by a guide rod 4. By moving the carriage 3 along the guide rod 4 by a stepping motor 5, the magnetic helad 2 is moved. Track movement is performed. The stepping motor 5 and the carriage 3 are coupled by a comprehensive means consisting of a boot 97.8, a belt IO, and the like.

[Problems to be Solved by the Invention] In the conventional configuration described above, the moving direction of the magnetic heald 2 is set on a straight line passing through the center of the magnetic disk 1, that is, on the radius or diameter. However, as shown in FIG. 4(A), the guide rod 4 is arranged parallel to the moving direction of the spatula 2, and the straight line along the arrangement direction does not intersect with the rotation axis 0 of the magnetic disk 1.

As shown in FIG. 4(A), if there is play between the bearing 3a of the carriage 3 and the guide rod 4, the magnetic helad 2 rotates. At this time, the rotation center axis 0' becomes the center of the bearing 3a of the guide rod 4, so the magnetic helad 2 moves with a large rotation radius.

In this case, the track deviation width of the magnetic head 2 determined by the play between the carriage and the guide rod 4 is
If the value is close to the track width T above, it becomes difficult to ensure compatibility in recording and reproduction.

Therefore, in the past, care had to be taken not to reduce the accuracy of parts and assembly of the carriage and guide rod.

[Means for Solving the Problems] In order to solve the following problems, in the present invention, for a recording medium that is rotationally driven in a predetermined direction, a recording/reproducing head is moved in a direction different from the moving direction of the medium, In an information recording and reproducing apparatus that relatively moves the recording medium and records and/or reproduces information in different areas of the recording medium, either the recording medium or the recording/reproducing head is used to perform the relative movement. A configuration is adopted in which the arrangement direction of the means for movably supporting the recording medium is substantially aligned within a plane containing the rotation axis of the recording medium.

[Function] According to the above configuration, the center of rotation of the recording/reproducing head caused by backlash in the member supporting the recording/reproducing head or the recording medium also coincides with the plane containing the rotational axis of the recording medium, which is different from the conventional configuration. Compared to this, it is possible to keep the rotation radius of the recording/reproducing head smaller than that caused by backlash of the support member. Therefore, if the machining accuracy of the support means is at the same level, compatibility in recording and reproduction can be ensured with higher precision than in the past.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

1(A) and 1(B) show the configuration of the main parts of a magnetic disk device such as a floppy disk and a hard disk device as an embodiment of the information recording/reproducing device according to the present invention. Reference numeral 1 denotes a magnetic disk, which is driven to rotate at a predetermined speed by a driving means (not shown) about a rotation center axis which is fixed as in the conventional case. As shown in FIG. 1(B), since the magnetic head 2 comes into sliding contact with the lower surface of the magnetic disk 1, the carriage 3 is supported so as to move in parallel in a plane parallel to the disk below the magnetic disk 1. Ru.

A support section 3b having a box-shaped structure is integrally formed on the upper part of the carriage 3, as shown in FIG. 1(B). The center portion of the support portion 3b is a hollow portion 3d, and bearings 3e, 3e are provided on the front and rear walls of the carriage formed by the hollow portion 3d. These bearings 3e,
3e supports the carriage 3 on the screw rod 4.

The screw rod 4 is rotatably supported by a screw bracket 9.9 fixed to the chassis of the apparatus through bearings 9a, 9a.

Further, an auxiliary rod 11 is arranged parallel to the screw rod 4 on the side of the carriage. This rod 11 passes through a guide portion 3C extending to the side of the carriage 3, and is connected to the magnetic field by the auxiliary rod 11 and the screw rod 4 so that the magnetic disk inviting surface of the door 2 is parallel to the magnetic disk 1. A carriage 3 is supported.

On the other hand, a pulley (or gear, etc.) 8 is fixed to the end of the screw rod 4 on the side closer to the magnetic disk l, and this pulley 8 is connected to the stepping motor 5 via a timing belt (or Yggde belt, etc.) 10. It is connected to a pulley 7 that is connected to a rotating shaft. Further, inside the hollow part 3d of the support part 3b of the carriage 3, a feed bottle 6 is fixed in parallel to the feed groove of the screw rod 4 so as to diagonally cross the hollow part 3d.
is slidably fitted into the feed groove of the screw rod 4.

In the above configuration, the rotation axis of the screw rod 4 is set within a plane containing the rotation axis of the magnetic disk l. In addition, the carriage 3 of the magnetic helad 2 is arranged so that the gap of the magnetic helad 2 is also within a plane that includes the rotation axis of the magnetic disk 1.
The mounting position has been set for the

In the above configuration, in order to move the magnetic head 2 to a different track position on the magnetic disk l in order to record and/or reproduce information, the stepping motor 5 is rotated by a predetermined amount, and the pulley 7 and timing belt 10 are rotated by a predetermined amount. and rotate the screw rod 4 via the pulley 8.

As a result, the feed bottle 6 is conveyed along the feed groove of the screw rod 4, so that the carriage 3 and the magnetic disk 2 fixed thereto move along the radius of the magnetic disk 1. This movement moves the magnetic head 2 to a different track position on the magnetic disk 1.

At this time, as shown in FIG. 4 CB), since the rotation center of the screw rod 4 supporting the carriage 3 is set within a plane containing the rotation axis 0 of the magnetic disk 1,
Play between screw rod 4 and screw bracket 9,
Alternatively, since the center of rotation 0' of the magnetic helad 2 caused by the backlash between the feed bottle 6 and the screw rod 4 coincides with the plane containing the rotation axis 0 of the magnetic disk 1, the rotation center 0' of the magnetic helad 2 is more stable than before. Track deviation @t can be reduced.

In other words, as shown in FIG. 4(A), conventionally, the rotation center 0' of the magnetic head caused by backlash of the supporting member does not line up with a straight line passing through the rotation center of the magnetic disk. The radius of rotation was large, but in the wooden embodiment, even if the play of the screw rod is the same, the radius of rotation of the magnetic heald 2 caused by the play becomes smaller than that of the conventional example, thereby reducing the track deviation width t. .

Conversely, if it is sufficient to guarantee the same track deviation width as in the past, the screw rod 4 and the screw bracket 9, or the screw rod 4 and the feed bin 6
It is also possible to reduce assembly accuracy and reduce manufacturing costs.

2 (A) and (B) are (A) of FIG. 1.

This figure shows a configuration in which the drive system for the screw rod 4 in (B) has been changed from the one using pulleys and a timing belt to the one using gears. Here, in order to match the rotational direction of the stepping motor 5 with the case shown in FIG. It meshes with gear 8'. The other configurations are exactly the same as those shown in FIGS. 1(A) and 1(B).

With the configuration shown in FIG. 2, the same effect as described above can be obtained, and by transmitting power between the gears, a larger reduction ratio can be set and track movement can be performed at a small pitch.

In the embodiments shown in FIGS. 1 and 2, it is possible to make the entire mechanism smaller in the width direction of the carriage 3 than before, but if miniaturization in the longitudinal direction of the carriage 3 is important, Screw the stepping motor shown in Figure 2 onto the screw rod 4.
By changing the gears 7 and 8 to a worm gear and a worm wheel gear, it is possible to downsize the carriage in the longitudinal direction, that is, in the depth direction of the apparatus.

Furthermore, although a feed bottle is used to connect the screw rod 4 and the carriage 3 in Figures 1 and 2, the driving torque can be increased by connecting the screw rod to a pole screw cut directly into the support part 3b of the carriage. This makes it possible to reduce the number of parts and maintain highly accurate head position control.

The above configuration is not limited to magnetic disk devices, but can also be applied to information recording and reproducing devices such as optical disk devices. In this case, the same technique can be applied to an apparatus in which the recording/reproducing head side is fixed and the recording medium side is moved to achieve relative movement between the two.

[Effects] As is clear from the above description, according to one aspect of the present invention, with respect to a recording medium that is rotationally driven in a predetermined direction, the recording/reproducing head is moved relative to the recording medium in a direction different from the moving direction of the medium. In an information recording and reproducing apparatus that records and/or reproduces information on different areas of a recording medium by moving the recording medium, either the recording medium or the recording and reproducing head is movably supported in order to perform the relative movement. Since the arrangement direction of the members is aligned almost within the plane that includes the rotation axis of the recording medium, the position control of the recording medium and recording/playback head can be performed with high accuracy using the same machining precision as before. It is possible to achieve the same level of accuracy as in the past using cheaper and less accurate members, and to reduce the size and weight of the entire mechanism.

[Brief explanation of drawings]

FIGS. 1(A) and 1(B) are a top view and a side view showing the configuration of the main parts of a magnetic disk device employing the present invention, and FIG.
), (B) is Fig. 1 (A). (B) is a top view and side view showing the configuration of the main parts of the magnetic disk device; FIG. 3 is a perspective view showing the configuration of the magnetic head moving mechanism in a conventional floppy disk device;
FIGS. 4A and 4B are explanatory diagrams showing different operations in the conventional and the present invention, respectively. l...Magnetic disk 2...Magnetic head 3...
Carriage 4...Screw rod 5...Stepping motor 6...Feed pin

Claims (1)

[Claims] With respect to a recording medium that is rotationally driven in a predetermined direction, a recording/reproducing head and the recording medium are moved relative to each other in a direction different from the moving direction of the medium to record and/or record information in different areas of the recording medium. In an information recording/reproducing apparatus that performs reproduction, the arrangement direction of the means for movably supporting either the recording medium or the recording/reproducing head for performing the relative movement is approximately within a plane containing the rotation axis of the recording medium. An information recording/reproducing device characterized by matching.