JPH0845202A - Magnetic disk driving device - Google Patents

Abstract

PURPOSE:To diminish an adverse effect upon recording and reproducing operation of a magnetic disk to the utmost by making an arm difficult to shake even when a comparatively large space is left between a feed screw and a carriage and also to suppress a cost increase as much as possible. CONSTITUTION:The arm 30 is integrally provided with one side part of a longitudinal side part 23 of the carriage 20 to be orthogonal to this one side part of the carriage 20 so as to bridge a space between the one side part and the feed screw 18, and a pin 31 to be meshed with the feed screw is embedded in a tip part of this arm 30. In addition, the arm 30 is formed wider toward its base in width in a plan view, and hence a cross sectional area in the vicinity of the base is rather larger than the conventional one.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive for recording and reproducing information on a magnetic disk such as a floppy disk used as a storage medium for personal computers and word processors.

[0002]

2. Description of the Related Art As a magnetic disk drive device of this type, one whose main part is shown in FIG. 3 is known. The magnetic disk drive device 50 includes a carriage 20 whose main portion has a substantially U-shaped outer shape and which is capable of sandwiching a magnetic disk D which is mounted on the rotary table 12 and rotated. In the carriage 20, a movable magnetic head 24 is provided on an upper side portion 21 that is vertically swingable, and a fixed magnetic head 2 is provided on a lower side portion 22.
5 is provided so that the disk D is sandwiched between the movable magnetic head 24 and the fixed magnetic head 25, and is guided by the guide rod 14 to be moved in the radial direction of the magnetic disk D.

That is, as shown in detail in FIG. 4, the carriage 20 is rotatably driven by the motor 17 along the direction of movement of the carriage 20 in parallel with it, in other words, in parallel with the guide rod 14. The feed screw 18 is provided, and an arm 40 having a pin 42 that engages with the feed screw 18 is provided on one side of the vertical side portion 23 of the carriage 20. It is integrally provided so as to bridge with 18 and to be orthogonal to one side of the carriage 20.

[0004]

In the conventional magnetic disk drive device 50 as described above, a relatively large space L is provided between the feed screw 18 and the carriage 20 due to the layout restrictions of each part. Inevitably, therefore, the arm 40 becomes relatively long. However,
Since the arm 40 is made of synthetic resin integrally with the carriage 20 and has a cantilever structure, the arm 40 may move along the moving direction of the carriage 20 as indicated by an arrow S in the figure due to a change in environment such as temperature and humidity. There was a big swing. If the arm 40 swings in this way, it adversely affects the recording / reproducing operation with respect to the magnetic disk (for example, the absolute amount of thermal off-track increases). in this case,
It is possible to think of a measure such as making the arm 40 made of a metal having high rigidity, but doing so causes a problem such as an increase in cost.

In view of the above point, the present invention makes it difficult for the arm to swing even if there is a relatively large distance between the feed screw and the carriage, and can minimize the adverse effect on the recording / reproducing operation with respect to the magnetic disk. An object of the present invention is to provide a magnetic disk drive device that can suppress cost increase as much as possible.

[0006]

In order to achieve the above object, a magnetic disk drive apparatus according to the present invention has a generally U-shape having an upper side portion and a lower side portion provided with a movable magnetic head and a fixed magnetic head. A main part is a synthetic resin, which has an outer shape and is designed to be moved in the radial direction of the magnetic disk by sandwiching the magnetic disk mounted on a rotary table and being rotated, between the movable magnetic head and the fixed magnetic head. Made of a carriage, a feed screw arranged parallel to the carriage along the moving direction of the carriage, and integrally formed so as to bridge the carriage and the feed screw so as to be orthogonal to the side portion of the carriage. An arm made of a synthetic resin, which is projectingly provided and has a pin which is engaged with the feed screw and is planted at its tip, and the width of the arm in plan view becomes wider toward the base. It is characterized in that it is.

[0007]

In the magnetic disk drive according to the present invention configured as described above, since the width of the arm in plan view becomes wider toward the root, the rigidity of the arm in the lateral direction increases. It becomes difficult for the arm to shake (horizontal shake) along the moving direction of the carriage.

As a result, even if there is a relatively large gap between the feed screw and the carriage, the arm is less likely to swing, so that it is possible to reduce the absolute amount of thermal off-track, and it is possible to reduce the magnetic disk. The adverse effect on the recording / reproducing operation can be minimized, and moreover, the arm can be made of a synthetic resin material integrally with the carriage as in the conventional case, so that the cost increase can be suppressed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a magnetic disk drive device according to the present invention. The magnetic disk drive device 10 of this example includes a carriage 20, a feed screw 18, and an arm 30, like the conventional device 50 described above. The main part of the carriage 20 is made of synthetic resin, and has an approximately U-shaped outer shape including an upper side part 21 and a lower side part 22 provided with a movable magnetic head 24 and a fixed magnetic head 25, and a vertical side part 23. The movable magnetic head 2 holds the magnetic disk D that is held and rotated by being mounted on the rotary table 12.
4 and the fixed magnetic head 25, and the guide rod 1
The magnetic disk D is moved in the radial direction while being guided by 4.

The feed screw 18 is arranged along the moving direction of the carriage 20 in parallel with it, in other words, in parallel with the guide rod 14, and is rotationally driven by a motor 17.

The arm 30 is used for the carriage 2
0 of the vertical side portion 23 and the feed screw 18 are bridged to the side portion of the carriage 20 so as to be orthogonal to the side portion of the carriage 20. The tip portion of the carriage 20 meshes with the feed screw. Although the pin 31 that is used is the same as in the conventional art, as shown in detail in FIG.
Since the width in plan view is wider toward the root and the thickness is the same as the conventional one, the cross-sectional area near the root is considerably larger than the conventional one.

As described above, since the width of the arm 30 in plan view is made wider toward the root, the arm 30 is
Since the rigidity of the arm 30 in the horizontal direction is increased, the arm 30 is less likely to shake (horizontal shake) along the moving direction of the carriage 20.

As a result, the feed screw 18 and the carriage 20
Even if there is a relatively large space between the arm 30 and
Since it becomes difficult to swing, the absolute amount of thermal off-track can be reduced and the adverse effect on the recording / reproducing operation with respect to the magnetic disk D can be minimized. Since it is made of a synthetic resin material integrally with the side portion 23, cost increase can be suppressed.

In addition to the above structure, the arm 30 has
It goes without saying that the rigidity can be further increased by making the longitudinal side portion 23 wider toward the root in the longitudinal direction.

The carriage 20 has been described with respect to the structure of the upper side portion 21 having the movable magnetic head 24 and the lower side portion 22 having the fixed magnetic head 25. However, both the upper side portion 21 and the lower side portion 22 can be moved. Even in the case of a carriage, the same action and effect are exhibited.

[0016]

As can be understood from the above description, in the magnetic disk drive device according to the present invention, the width of the arm in plan view becomes wider toward the root, so that the direction of movement of the carriage of the arm is increased. It is possible to prevent shake along the side (lateral shake) easily, so that even if there is a relatively large gap between the feed screw and the carriage, it is possible to prevent shake of the arm, and as a result, the absolute amount of thermal off-track can be reduced. As a result, the adverse effect on the recording / reproducing operation with respect to the magnetic disk can be minimized, and the arm can be made of a synthetic resin material integrally with the carriage as in the conventional case, so that the cost increase can be suppressed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of an embodiment of a magnetic disk drive device according to the present invention.

FIG. 2 is a partially enlarged view showing the periphery of the carriage of FIG.

FIG. 3 is a perspective view showing a main part of an example of a conventional magnetic disk drive device.

FIG. 4 is a partially enlarged view showing the periphery of the carriage of FIG.

[Explanation of symbols]

 10 Magnetic Disk Drive 18 Feed Screw 20 Carriage 23 Vertical Side 24, 25 Magnetic Head 30 Arm 31 Pin D Disk

Claims (1)

[Claims] 1. A magnetic disk, which has a substantially U-shaped outer shape having an upper side portion and a lower side portion on which a movable magnetic head and a fixed magnetic head are provided and which is mounted on a rotary table and can be rotated, is fixed to the movable magnetic head. A carriage whose main part is made of synthetic resin, which is designed to be moved in the radial direction of the magnetic disk while being sandwiched between it and a magnetic head, and a feed screw which is arranged in parallel with the carriage along the moving direction of the carriage. A synthetic resin projecting integrally on a side portion of the carriage so as to bridge the carriage and the feed screw so as to be orthogonal to the side portion, and a pin meshing with the feed screw is planted at the tip end thereof A magnetic disk drive, wherein the width of the arm in plan view is made wider toward the root.