JPH11203800A - Flexible disk drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance control property and durability by securing the smooth movement of a head carriage always in a flexible disk drive. SOLUTION: This flexible disk drive is provided with a head carriage 14 holding a magnetic head movably in a prescribed direction with respect to a magnetic disk and a guide bar 15 guiding the head carriage along the prescribed direction and the guide bar 15 is applied with a surface treating such as plating treating, nitriding treating and so forth. Consequently. the sliding between the head carriage 14 and the guide bar 15 becomes smooth without coating grease on the bar 15 by applying the surface treating on the bar in this manner and a head positioning control can be performed with high accuracy. Thus, the seek life and durability between the carriage and the guide bar are enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flexible disk drive, and more particularly, to a flexible disk drive carriage mechanism.

[0002]

2. Description of the Related Art An example of a conventional flexible disk drive will be described with reference to FIG. The illustrated flexible disk drive has a main frame 31 and a thin plate-shaped cover body 32 that covers the main frame 31. The main frame 31 and the cover body 32 are combined with each other to form a hollow receiving portion surrounded by the main frame 31 and the cover body 32. The receiving unit receives the magnetic disk and performs magnetic recording and reproduction on an access area of the magnetic disk.

[0003] A front bezel 34 for guiding the magnetic disk to the receiving portion in a correct posture is attached to a front portion of the receiving portion. A reception port 34a is formed in the front bezel 34. Receiving port 34a in the receiving section
There is provided an eject plate 37 for positioning the magnetic disk inserted from the same side so that one surface thereof is opposed to the disk, and a disk holder unit 38 for facing the surface opposite to the one surface of the magnetic disk and holding the magnetic disk at a predetermined position.

Further, a head carriage (carriage) 39 having a magnetic head 33 facing a window of the magnetic disk when the magnetic disk is positioned at a predetermined position, and an eject lever 40 are provided in the receiving portion. I have. The eject lever 40 includes a rotating shaft (shaft portion) 40 a pivotally supported by the main frame 31 and a rotating shaft 40 a.
And an arm portion 40b extending to one side.
The eject lever 40 rotates about a rotation shaft 40 a in parallel with the surface of the main frame 31.

The components held by the main frame 31 include, in addition to the eject lever 40 and the head carriage 39, a disk table 35 for rotating the magnetic disk, a stepping motor 36 for moving the head carriage 39 back and forth, A guide bar (guide member) 41a for guiding the movement of the head carriage 39, a guide bar clamp 41b for clamping the guide bar 41a, and the like are attached. Further, on the lower surface of the main frame 31, as a component of the flexible disk drive, a main printed circuit board on which circuits necessary for reading / writing data are mounted, a motor for rotating and driving the disk table 35, and a drive circuit therefor are mounted. Sub-printed circuit board and the like. These main printed circuit board and sub printed circuit board are the lower cover body (not shown)
Covered by.

The eject plate 37 pushes the eject button 42 projecting from the outer surface of the front bezel 34 into the receiving portion, and moves slightly backward to rotate the eject lever 40.

The magnetic disk housed in the receiving portion is locked by a lock mechanism (not shown) so that the magnetic disk does not jump out of the receiving portion. And
When the lock release operation of the lock mechanism is performed from this state,
The magnetic disk is ejected so that a part thereof protrudes out of the receiving opening 34a of the front bezel 34 from the receiving portion by the urging force of the eject lever spring 43 which is a spring mechanism for urging the eject lever 40. . The eject plate 37 is provided with an eject spring 37a as a spring mechanism. When the ejection button 42 is released, the eject plate 37 returns to the original position by the spring mechanism. In this way, the magnetic disk can be pulled out of the receiving section.

[0008]

By the way, as described above, in the flexible disk drive, the carriage is guided by the guide bar when the head carriage is moved, whereby the feed position (movement position) of the carriage is adjusted. I try to increase the accuracy. For this reason, a round bar is generally used as the guide bar, and the rattling in the receiving portion (round hole) of the carriage is managed. In addition, in order to smoothly move the carriage along the guide bar, grease is applied to the guide bar, or an oil metal or the like is used for a receiving portion (round hole) of the carriage.

As described above, in the conventional flexible disk drive, an operation such as applying grease to the guide bar must be performed. That is, since the application operation of applying grease is performed, the grease is uniformly applied. This makes it difficult to ensure smooth movement of the carriage. In particular, in a high-capacity flexible disk drive, since the moving speed of the head carriage is high, it is necessary to ensure smooth movement of the head carriage.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flexible disk drive in which a smooth movement of a head carriage is always ensured and excellent in controllability and durability.

[0011]

According to the present invention, a magnetic head for reading and writing data from and to a magnetic disk, and the magnetic head are movably held in a predetermined direction with respect to the magnetic disk. In a flexible disk drive having a carriage and a guide member for guiding the carriage along the predetermined direction, the flexible disk drive is characterized in that the guide member is subjected to a surface treatment.

As the surface treatment, for example, plating or nitriding is used. Further, as the surface treatment, a coating treatment with Teflon, boron, molybdenum, polyamide, fluorine, or the like may be performed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

Referring to FIGS. 1 to 3, FIG. 1 does not show a mounting / dismounting mechanism for inserting and removing a magnetic disk in the configuration of the flexible disk drive. The main frame 10 has a U-shaped cross section having side walls 10-1 on both sides, and all the components are accommodated in the main frame 10. The main printed board 11 and the sub-printed board 20 are fixed by screws near the bottom of the main frame 10. That is, as for the main printed circuit board 11, the main plate of the main frame 10 is cut and raised.
One support 10-2 is formed, and the main printed circuit board 1
1 is fixed on the two support bases 10-2 by screws 12. The use of such a support 10-2 is as follows.
This is because the lower surface side of the main printed circuit board 11 is a solder surface on which electronic components or circuits are mounted, and is for securing a necessary space between the main printed circuit board 11 and the main plate of the main frame 10.

The stepping motor 13 is provided on a rear wall 10-3 provided at the rear end of the main frame 10, and its output shaft 13-1 passes through the rear wall 10-3. The tip of the output shaft 13-1 is rotatably supported by a bearing 10-4 formed by cutting and raising the main plate of the main frame 10. The output shaft 13-1 is threaded around. Arm 14-1 provided on head carriage 14
When the output shaft 13-1 rotates, the head carriage 14 moves in the same direction as the output shaft 13-1 because the pin 14-2 implanted in the shaft 14 is engaged with this screw.

A U-shaped bearing arm 14-3 is provided on the head carriage 14 opposite to the arm 14-1. A guide bar 15 extends through the bearing arm 14-3. The guide bar 15 is a guide bar clamp 16
Is held in. As a result, the output shaft 13-1
The movement of the head carriage 14 with the rotation of the head is guided by the guide bar 15. The guide bar clamp 16
The support plate 10-4 is screwed and fixed. The support plate 10-4 is formed by cutting and raising the main plate of the main frame 10 and protrudes upward through a hole in the main printed circuit board 11.

The guide bar 15 has been subjected to a surface treatment in advance. For example, the guide bar 15 is subjected to plating or nitriding as a surface treatment. Further, a coating treatment may be performed as a surface treatment. In this case, for example, Teflon, boron, molybdenum,
Polyamide, fluorine, or the like is used.

As described above, by preliminarily surface-treating the guide bar 15, it is not necessary to apply grease or the like as in the prior art, and the slip between the head carriage and the guide bar becomes smooth and the head is positioned. Control can be performed accurately. In particular, even if the moving speed of the head carriage is high as in a high capacity flexible disk drive, the sliding between the head carriage and the guide bar can be made smooth. In addition, since the sliding between the head carriage and the guide bar can be made smooth, the seek life and durability between the carriage and the guide bar are improved.

Next, the sub-printed circuit board 20 will be described. As is apparent from FIG.
Since the motor 21 for rotating the magnetic disk and necessary circuit components (not shown) are mounted only on the upper surface side,
The magnetic disk is fixed by screws 12 so as to be almost in contact with the entrance of the magnetic disk, that is, the main plate of the main frame 10 near the front bezel 17. The structure of the motor 21 will be briefly described. The rotating shaft 21-1, a cylindrical center metal 21-2 as a bearing, a plurality of stator cores 21-3 extending radially from the center, A ring-shaped permanent magnet 21 provided so as to surround an outer peripheral portion of a stator coil 21-4 and a core 21-3 wound around a distal end portion.
-5, a casing 21-6 rotatably holding the permanent magnet 21-5, and the permanent magnet 21-5 and the casing 21-6 rotate together with the rotating shaft 21-1. 21-
7 is an index magnet.

The upper flat portion 21-6a of the casing 21-6 has the same function as the disk table 35 described with reference to FIG. Therefore, an arm 22 is rotatably mounted on the lower surface side of the flat portion 21-6a with one end pivotally supported, and a drive roller 23 is rotatably provided at the other end of the arm 22. A square hole is provided in the flat portion 21-6a, and the drive roller 23 is disposed so as to protrude upward through the hole. The magnetic disk accommodated in the flexible disk drive rests on the flat portion 21-6a, and is driven to rotate by the drive roller 23 being fitted into a hole formed in the hub of the magnetic disk.

On the upper part of the motor 21, an attaching / detaching mechanism for taking in and out the magnetic disk, that is, the eject plate 24 (corresponding to 37 in FIG. 4) described in FIG. 4, a disk holder unit 25 and the like are assembled. A cover plate 18 is combined with the main frame 10 to cover a space in the main frame 10. The cover plate 18 covers up to a portion corresponding to the rear wall 10-3.

As described above, the main printed circuit board 11,
The main frame 10 also includes a head carriage 14 and an associated mechanism for driving and guiding the same, a sub-printed circuit board on which a drive mechanism for rotating and driving the magnetic disk and a circuit therefor are mounted, and a detachable mechanism for loading and unloading the magnetic disk.
It is not necessary to provide a cover plate on the lower side of the main frame 10 because it is housed inside.

Referring to FIGS. 1 and 3, the rear portion of side wall 10-1 is further extended than the rear end portion of main frame 10, and the rear end edge of this extended portion is bent inward to form a bent portion. 10-5 is formed. The bent portion 10-5 is connected to the rear end of the stepping motor 13 or the main printed circuit board 11.
It is formed at a position extending further rearward than the pin terminal of the I / F (interface) connector 19 mounted on the rear part. This is because, since the cover plate 18 is cut at the rear wall 10-3, if the side wall 10-1 is cut at a position before the bent portion 10-5, and if there is no bent portion, when assembling, Stepping motor 13 and I / F connector 19
This is because there is a risk that the pin terminal may hit the corner of the table and damage it. That is, the bent portion 10-5 is connected to the stepping motor 13 or the I / O
It functions as a protection member for the F connector 19. The illustration of the front bezel is omitted in FIG.

Further, also at the lower end of the rear part of the side wall 10-1 adjacent to the main printed board 11, a part of the lower end is bent to form a bent part 10-6. The bent portion 10-6 functions as a support member that supports a portion of the main printed circuit board 11 that protrudes from the rear end of the main frame 10.

[0025]

As described above, according to the present invention,
Since surface treatment is performed on the guide member (guide bar) of the carriage, there is no need to apply grease or the like as in the conventional case, and the slip between the head carriage and the guide bar becomes smooth, and the head positioning control is performed with high accuracy. There is an effect that it can be performed well. In particular, even if the moving speed of the head carriage is high as in a high capacity flexible disk drive, the sliding between the head carriage and the guide bar can be made smooth. In addition, since the sliding between the head carriage and the guide bar can be made smooth, the seek life and durability between the carriage and the guide bar can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a flexible disk drive according to the present invention.

FIG. 2 is a sectional view taken along line AA ′ of FIG.

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

FIG. 4 is an exploded perspective view schematically showing a conventional flexible disk drive.

[Explanation of symbols]

 Reference Signs List 10 Main frame 11 Main printed circuit board 12 Screw 13 Stepping motor 14 Head carriage 15 Guide bar 16 Guide bar clamp 17 Cover plate 18 I / F connector 20 Sub printed circuit board 21 Motor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshinori Tanki 1601 Sakai, Atsugi-shi, Kanagawa Mitsumi Electric Co., Ltd.

Claims (3)

[Claims] A magnetic head for reading and writing data to and from a magnetic disk; a carriage for holding the magnetic head so as to be movable in a predetermined direction with respect to the magnetic disk; A flexible disk drive having a guide member that guides along the surface of the flexible disk drive, wherein the guide member is subjected to a surface treatment. 2. The flexible disk drive according to claim 1, wherein a plating process or a nitriding process is used as the surface treatment. 3. The flexible disk drive according to claim 1, wherein the surface treatment is performed by coating with Teflon, boron, molybdenum, polyamide, fluorine, or the like.