JP3348306B2 - Disk unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive suitable for use in, for example, a floppy disk drive.

[0002]

2. Description of the Related Art Disk devices such as floppy disk devices are widely used in personal computers, office computers, word processors and the like, and their use has been remarkable.

Conventionally, this type of disk device is configured, for example, as shown in FIG.

Referring to FIG. 1, reference numeral 1 denotes a chassis in which a spindle motor shaft 2 as a center of rotation of a disk is built in, and for example, a housing of a personal computer or the like (not shown). ), And is formed by a bottomed box having a storage space 1a entirely open frontward and facing the disk cartridge 3. At the rear right side of the bottom surface of the chassis 1, a holding wall 4 having a through hole 4a opening in the front-rear direction and a support shaft 5 arranged in parallel with the holding wall 4 at a predetermined interval are provided upright. Are provided with two spring locking pieces 6 which are arranged side by side at predetermined intervals in the left-right direction. In addition, guide grooves (only the two left guide grooves are shown) 7 extending vertically are integrally provided on both side walls of the chassis 1.

[0005] Reference numerals 8 and 9 denote two pairs of protrusions arranged in parallel in the front-rear direction at a predetermined interval, which are mounted on the bottom surface of the chassis 1 and are configured to guide a slide plate described later in the front-rear direction. I have. Protrusions 8 and 9 of each pair
Are arranged side by side at predetermined intervals in the left-right direction. Among them, a conical cartridge positioning portion 9a whose outer diameter decreases toward the front end is provided on the rear projection 9.
Is provided.

Reference numeral 10 denotes a U-shaped slide plate having a U-shaped cross-section plate having an eject button 11 for ejecting a disc cartridge on the right side of the front end thereof, and a U-shaped notch 12a in plan view facing the spindle motor shaft 2. The chassis 1 comprises a bottom plate 12 having a first elongated hole 12b in which the spring engaging piece 6 faces, and two side plates 13 erected on both sides of the bottom plate 12 and facing each other at a predetermined interval.
It is provided to be able to advance and retreat inside.

On the bottom plate 12 of the slide plate 10, the projections 8, 9 face a notch 14 extending in the front-rear direction, a second elongated hole 15, and a spring engagement member corresponding to the spring engagement piece 6. A stop hole 16 is provided. A lock claw 17 protruding downward is attached to one rear side edge of the bottom plate 12 of the slide plate 10.

The bottom plate 12 of the slide plate 10 is formed with four front, rear, left and right cam grooves 18 having a gradient that rises obliquely forward. Is provided with a rack 19 extending in the front-rear direction.

Reference numeral 20 denotes two tension coil springs for urging the slide plate 10 forward, and both ends thereof are locked by the respective spring locking pieces 6 and the respective spring locking holes 16.

Reference numeral 21 denotes a trigger arm having an engaging surface 21a and a guide surface 21b corresponding to the lock pawl 17, which is rotatably provided on the support shaft 5, and has a spring projecting laterally on an upper end surface. An arm operator 22 having a locking projection 22a is provided integrally.

Reference numeral 23 denotes a torsion spring for urging the trigger arm 21 to rotate in a direction for locking the slide plate 10. A torsion spring is provided around the support shaft 5, and both ends are provided with the protrusion. 22a and the holding wall 4.

Reference numeral 24 denotes a stepping motor for feeding the head carriage, which is fixed to the rear end of the chassis 1. The output shaft 25 of the stepping motor 24 is formed by a lead screw shaft extending in the front-rear direction and having a helical V-shaped groove 25a, and has a front end bearing in a through hole 4a of the holding wall 4 (see FIG. (Not shown).

Reference numeral 26 denotes a guide shaft extending in the front-rear direction, which is held at the rear central portion of the chassis 1, and is configured to guide a head carriage described later in the front-rear direction.

Reference numeral 27 denotes a needle pin 2 projecting obliquely rearward.
8 and a head carriage having a leaf spring 29 for pressing the needle pin 28 against a groove wall in the V-shaped groove 25a of the output shaft 25. The head carriage is held above the chassis 1 so as to be able to advance and retreat. Is provided with a shaft hole (not shown) through which the guide shaft 26 is inserted via a bush (not shown). A first head 3 for reading recorded information on a disk is provided on the upper surface of the tip of the head carriage 27.
0, and the first head 3
Head arm 32 having second head 31 corresponding to 0
Is swingably attached via an elastic body 33.
The head arm 32 is configured such that the second head 31
The torsion spring 34 moves in the direction approaching the head 30.
The stopper 32a for regulating the rotation of the arm is provided integrally on one side edge of the arm.

Reference numeral 36 denotes a cartridge holder for holding the disc cartridge 3 so as to be freely inserted and removed, and is provided in the slide plate 10 so as to be able to move up and down. A roller 37 as a convex portion facing the cam groove 18 and the guide groove 7 is rotatably held at both side ends of the cartridge holder 36, and is opened on both sides at one side edge of the upper end portion. A cut-and-raised piece 38 having a locking hole 38a is provided. And this cartridge holder 36
The lock pawl 17 and the engaging surface 21 are pressed by the pressing of the disk cartridge 3 against the arm operating member 22.
a is disengaged and approaches the bottom plate 12 by the forward movement of the slide plate 10, while the eject button 1
The slide plate 10 is configured to be separated from the bottom plate 12 by the rearward movement of the slide plate 10 due to the pressing of 1.

Reference numeral 39 denotes an arm for opening and closing the shutter 3a of the disk cartridge 3. The arm 39 is rotatably provided on the rear side edge of the upper end of the holder 36. The arm 39 is integrally formed with a locking piece 40 projecting upward.

Reference numeral 41 denotes a tension coil spring for giving the arm 39 a return behavior.
0 and locked in the locking hole 38a.

Reference numerals 42 and 43 denote a switch for detecting the type (2DD, 2HD, 2ED) of the disk (not shown) and a switch for detecting whether or not writing is possible on the disk (not shown). Is installed through.

A gear 46 meshes with the rack 19.
The reduction gear mechanism has a rear end portion of the chassis 1.

Reference numerals 47 and 48 denote positioning recesses provided in the case 3b of the disk cartridge 3 for the projections 9 to enter and exit.

[0021]

By the way, in this type of disk drive, FIG.
As shown in FIG. 5, a metal cover 49 for covering the head carriage 27 and the head arm 32 is mounted on the chassis 1 and a magnetic piece 50 such as permalloy is mounted on the upper surface of the non-connection side end of the head arm 32. Therefore, when the head arm 32 was raised, the magnetic piece 50 was in contact with the inner surface of the cover due to bending of the cover 49 or the like. As a result, the magnetic piece 50 slides on the cover 49 when the head carriage 27 advances and retreats, and there is a problem that abnormal noise is generated due to friction between metals.

Further, the contact of the upper surface of the magnetic piece 50 with the inner side surface of the cover 49 increases the contact resistance when the head carriage 27 moves back and forth (seek) because of the large contact area, and a seek error occurs. There were also problems.

The present invention has been made in view of such circumstances, and it is possible to prevent the metals from coming into contact with each other when the head carriage advances and retreats, thereby preventing abnormal noise and seek errors. A disk device is provided.

[0024]

A disk drive according to the present invention comprises a chassis for holding a carriage which moves forward and backward by driving a motor, a synthetic resin head arm which is swingably connected to the carriage, and a chassis for holding the same. A metal cover mounted on the head and covering the carriage and the head arm; and a seal mounted on the head arm.
A disk drive provided with a head piece;
At a position other than the mounting position of the shield piece, a synthetic resin protrusion protruding toward the inner surface of the cover.
Provided integrally, the upper end position of the protrusion is above the shield piece
It is designed to be higher than the end position.

[0025]

In the present invention, when the head arm made of synthetic resin rises and comes into contact with the inner surface of the cover, only the protrusion comes into contact with the inner surface of the cover, and the head arm has
The shield piece does not abut against the cover .

[0026]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 is a sectional view showing a main part of a disk drive according to the present invention, and FIG. 2 is a perspective view showing a head assembly of the disk drive according to the present invention. The same reference numerals are given to the members, and the detailed description is omitted. In the description of the embodiment, the same reference numerals are used for the same members as those used in the description of the conventional example.

In the figure, reference numeral 60 denotes a head arm having a second head 61 corresponding to the first head 30. An arm mounting portion 62a of an elastic body 62 is provided above the base end of the head carriage 27. It is mounted so that it can swing freely.

An arm rotation restricting stopper 63 projecting to the left is integrally formed on one left side edge of the head arm 60. The stopper 63 projects upward at the center in the width direction of the upper end surface and has a predetermined width in the left and right direction. The two rising pieces 64a, 64b facing each other with an interval are integrally formed with the spring locking portions 64. The head arm 60 is oscillated by a torsion spring 65 in a direction in which the second head 61 approaches the first head 30.

A shield piece 66 made of a magnetic material such as permalloy is mounted on the upper surface of the head arm 60 on the side opposite to the connection side.

Numerals 67 and 68 denote two protrusions juxtaposed in the front-rear direction of the shield piece 66.
Are protruded integrally at the opposite end of the connection side. These sticks 6
Reference numerals 7 and 68 are formed by protrusions having substantially curved ellipses in plan view, having curved surfaces 67a and 68a that can abut on the inner surface of the cover 49 and projecting toward the inner surface of the cover 49.

Reference numeral 69 denotes a holder integrally provided below the left side of the head carriage 27 and having a shaft hole 69a through which the guide shaft 26 is inserted via a bush B.

Reference numeral 70 denotes a spring mounting piece fixed to the rear end of the head carriage 27 and having a plurality of spring locking grooves 70a.

In the disk device thus constructed, the head arm 60 is raised and the metal cover 49 is raised.
When it comes into contact with the inner side surface of the head, it comes into contact with the curved surfaces 67a, 68a of the synthetic resin projecting members 67, 68 located at a position higher than the position where the head arm 60 is raised. be able to.

In this embodiment, the curved surfaces 67a, 68a of the projections 67, 68 abut against the inner surface of the cover 49 because the contact area is small, so that the head carriage 27 moves forward and backward (seek) accordingly. Sometimes the movement resistance can be reduced.

In this embodiment, the shield piece 6
6, two projecting members 67 and 68 are arranged in the front-rear direction, but the present invention is not limited to this.
The same effects as those of the embodiment can be obtained also in the case of having the protrusion as shown in (A) to (C).

In this case, a single protrusion 71 is arranged on the head-up side of both side edges of the head arm 60 in FIG. In FIG. 7B, two protrusions 81 and 82 are arranged in the left-right direction of the shield piece 66. In FIG. 9C, a single protrusion 91 is arranged at a position in front of the shield piece 66.

In this embodiment, the head arm
Although the example in which the protrusions 67 and 68 are positioned at 60 is shown, in the present invention, the protrusions 102 and 10 projecting toward the head arm 60 are provided on the inner surface of the metal cover 101 as shown in FIG.
3 may be those provided integrally with the drawing and the like as a matter of course.

In addition, in this embodiment, an example in which the present invention is applied to a floppy disk device has been described. However, the present invention is not limited to this, and can be applied to other disk devices in the same manner as the embodiment.

[0040]

As described above, according to the present invention, a chassis for holding a carriage that advances and retreats by driving a motor, a synthetic resin head arm slidably connected to the carriage, and a chassis for the chassis. A metal cover attached to cover the carriage and the head arm; and a shield piece attached to the head arm.
In the disk device obtained above,
At a position other than the mounting position of the shield piece, a synthetic resin protrusion protruding toward the inner surface of the cover is integrally provided.
The head arm on the inner surface of the cover.
At a position other than the mounting position of the shield piece at
When the head arm made of synthetic resin rises and comes into contact with the inner surface of the cover, only the
Abuts the inside surface of the cover and seals the head arm
The part of the chip will not come into contact .

Therefore, when the head carriage advances and retreats, it is possible to prevent metal-to-metal contact between the shield piece attached to the head arm and the metal cover, thereby preventing generation of abnormal noise due to friction between metals. Can be.

Also, since only the protruding part comes into contact, the contact is made.
Since the contact area is small, the movement resistance at the time of seeking of the head carriage is reduced, and the occurrence of seek error can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a disk drive according to the present invention.

FIG. 2 is a perspective view showing a head assembly of the disk device according to the present invention.

FIGS. 3A to 3C are perspective views showing another embodiment of the head assembly according to the present invention.

FIG. 4 is a sectional view showing another embodiment of the disk drive according to the present invention.

FIG. 5 is an exploded perspective view showing the entire conventional disk device.

FIG. 6 is a sectional view showing a head assembly of a conventional disk drive.

[Explanation of symbols]

27 head carriage 30 first head 49 cover 60 head arm 61 second head 62 elastic body 65 torsion spring 66 shield pieces 67, 68, 102 and 103

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-4-216366 (JP, A) JP-A-63-90062 (JP, A) JP-A-3-295086 (JP, A) JP-A-2- 53272 (JP, A) JP-A-4-302880 (JP, A) JP-A-4-31459 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 17/32 G11B 21 / 12

Claims (3)

(57) [Claims] 1. A carriage for moving forward and backward by driving a motor, a chassis holding a synthetic resin head arm swingably connected to the carriage, and a metal mounted on the chassis and covering the carriage and the head arm. And a cover attached to the head arm
In the disk drive provided with the shield piece, the mounting position of the shield piece on the head arm
At the outer position, a synthetic resin protrusion protruding toward the inner surface of the cover is integrally provided, and the upper end position of the protrusion is set to the front.
A disk device characterized in that the height is higher than the upper end position of the shield piece . 2. A method according to claim 1, wherein the projections are the heads
A disk device, which is positioned on the head-up side of a drive arm . 3. A carriage for moving back and forth by driving a motor, a chassis holding a synthetic resin head arm swingably connected to the carriage, and a metal mounted on the chassis and covering the carriage and the head arm. And a cover attached to the head arm
And a shield piece, wherein the inner surface of the cover has
Install a projection that abuts a position other than the shield piece mounting position.
When the head arm is lifted,
The shield piece does not contact the inner surface of the cover.
Disk and wherein the was Unishi.