JP2656671B2 - Floppy disk device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floppy disk drive and, more particularly, to its structure.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for miniaturization of information processing apparatuses while keeping their reliability at a high level. Among them, especially in a floppy disk device, the demand for downsizing is remarkable because it is mounted on a downsized personal computer or the like.

In a floppy disk drive, miniaturization and thinning depend on miniaturization and thinning of a drive system structure. In the 3.5-inch floppy disk device, the size on the plane can be reduced to approximately the same size as the medium. However, there is room for improvement in reducing the thickness.

Next, a drive system of a conventional floppy disk drive will be specifically described with reference to the drawings.

[0005] A frame body 41 forming an apparatus housing mounts and supports a slide plate 42, a cassette holder 43, a spindle motor 50, and a linear pulse motor 54. The cassette holder 43 supports the medium,
The medium moves so as to be engaged with the spindle motor 50 as a guide when the medium is inserted. The trajectory of the movement of the cassette holder 43 is set by the slide plate 42. That is, the movement of the medium is performed by the slide plate 42 and the cassette holder 43.

Next, a description will be given of the spindle motor 50 for generating a rotating force of the medium. Referring to FIG. 4, the spindle motor 50 has a rotor 45 and a stator 48, and generates a rotating force by an electromagnetic action of the rotor 45 and the stator 48. The stator 48 is fixed to the frame 41, and the rotor 45 is fixed to a shaft 46 supported by a bearing 47 supported by the bearing housing 44. The bearing housing 44 is fixed to the frame 4 by screws 49.
1 is fixedly supported.

Referring to FIG. 5, a linear pulse motor 5
4 has a mover 52 and a stator 53, and obtains a translational force from these electromagnetic actions. A head 51 that scans the lower surface of the medium is fixed to the mover 52. Stator 53
Are fixed to the frame 41 by screws 55.

[0008]

A floppy disk drive requires two conditions with respect to the above-mentioned structure in order to increase the reliability of the apparatus. First, since the slide plate 42 and the cassette holder 43 are the parts that receive the most mechanical stress when the medium is attached and detached, they must be strong. Along with this, the frame supporting these also needs to be strong.

Second, since the spindle motor 50 and the linear pulse motor 54 support the medium and the head, their relative positions are required to be stationary. This change in relative position causes head off-track.

Considering the above-described conventional example from this viewpoint, the frame 41 must have a sufficient thickness from the first condition. The thickness of the frame body 41 on its lower surface (the mounting surface of the bearing housing 44 and the stator 53) causes an increase in the thickness of the device and an increase in weight. Further, when the bearing housing 44 and the stator 53 are fixed by screws, loosening of the screws 49 and 55 directly appears as a displacement of the head 51.

[0011]

In order to reduce the thickness of the apparatus while satisfying the first and second conditions, the floppy disk apparatus of the present invention supports a medium guide mechanism such as a slide plate. The frame and the bottom plate which is thinner than this frame and support the spindle motor and the linear pulse motor are connected, and the bearing housing of the spindle motor and the stator of the linear pulse motor are molded outsert molded to the bottom plate. It is stuck.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows only the mechanism fixed to the bottom plate 2 which is a feature of the present invention (excluding the electric system). The frame 1 has four sides bent in the same direction and a substantially rectangular hole formed therein.
To the bottom plate 2. A mechanism for inserting and removing a medium is attached to the frame 1, but this attachment mechanism is not shown because it is the same as the conventional one. The bottom plate 2 is made of a material thinner than the frame 1.

The stator 5 has a rail 10 and is fixed to the bottom plate 2. A mover 6a is disposed at a position indicated by a dotted line 6b. The mover 6a is provided on the rail 10 by electromagnetic action with the stator 5 and moves in parallel.
(The position of the dotted line 7b).

The bearing housing 3 supports a bearing 4 inside thereof and is fixed to the bottom plate 2. The bearing 4 is provided on the shaft 3 of the rotor 32 provided at the position indicated by the dashed line 8.
1 is supported.

Next, the stator 5 and the bearing housing 3
The attachment of the base 4 to the bottom plate 2 will be described with reference to FIGS. The stator 5 has a ball 11 on its rail portion 10.
The movable element 6a is supported via the. The mover 6a is guided by the ball 11 and the rail 10, and moves in the direction perpendicular to the plane of the drawing in the drawing due to the electromagnetic action of the stator 5. The mover 6a has a head 7a that scans one side of the mounting medium,
The support 12 is fixed. A head assembly (not shown) is elastically supported on the support 12, and the head of the head assembly scans the other surface of the medium. The stator 5 is fixed to the bottom plate 2, and this fixing is so-called outsert molding. (This outsert molding is described in JP-A-62-41090 and JP-A-62-41.
010 etc.). The bottom plate 2 is provided with a rectangular through hole at a position indicated by a two-dot chain line in FIG. 1 and a plurality of circular openings on both sides thereof. At this position, the stator 5 is outsert molded, and the mounting structure of the stator 5 to the bottom plate 2 is shown in FIG.
become that way.

Next, referring to FIG.
Will be described. A bearing housing 34 is fixed to the bottom plate 2, and a bearing 35 is provided inside the bearing housing 34. A stator 33 is fixed outside the bearing housing 34. The rotor 32 has a shaft 31 at the center, which is supported inside a bearing 35. The rotor 32 has a permanent magnet 36 at a position facing the stator 33, and the rotor 32 is rotated by a mutual electromagnetic action between the stator 33 and the permanent magnet 36.

The bearing housing 34 is also fixed to the bottom plate 2 by outsert molding in the same manner as the stator 5 described above.

[0018]

As described above, the floppy disk drive of the present invention has a sufficient strength since the drive system is mounted on two frame members including the frame and the bottom plate thinner than the frame. The thickness of the apparatus can be reduced while ensuring the thickness.

Further, by fixing the stator of the linear pulse motor and the bearing housing of the spindle motor to the bottom plate by outsert molding, it is possible to prevent the head from being displaced relative to the spindle motor rotation shaft.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view taken along line YY of FIG. 1;

FIG. 4 is a partial sectional view showing a spindle motor of a conventional floppy disk device.

FIG. 5 is a partial sectional view showing a linear pulse motor of a conventional floppy disk device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 2 Bottom plate 3 Bearing housing 5 Stator

Continuation of the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location G11B 21/02 612 G11B 21/02 612L

Claims (3)

(57) [Claims] A magnetic head mounted on the magnetic recording medium; a moving means for moving the magnetic recording medium in a radial direction; a spindle motor for rotating the magnetic recording medium; a cassette holder for accommodating the magnetic recording medium; In a floppy disk device having a slide plate for moving to a recording / reproducing position, a bottom plate supporting a fixed portion of the moving means and a fixed portion of the spindle motor,
A floppy disk drive, comprising: a frame supporting the cassette holder and the slide plate; and a frame fixed to the bottom plate at a side portion of the bottom plate. 2. The floppy disk drive according to claim 1, wherein said moving means is a linear pulse motor. 3. The floppy disk drive according to claim 2, wherein the stator of the linear pulse motor and the bearing housing of the spindle motor are formed by outsert molding.