JP3468253B2 - Magnetic disk driver - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing disk (hereinafter referred to as a magnetic disk) having a structure in which a flexible disk for recording / reproducing information such as a magnetic disk is housed in a case. The present invention relates to a magnetic disk driver that is rotationally driven to perform information processing, and more particularly to a magnetic disk driver that has a stepping motor fixing structure for driving a carriage along a predetermined direction.

[0002]

9 and 10 show the structure around a magnetic head feed mechanism of a conventional magnetic disk driver. The magnetic disk 30 is inserted into the magnetic disk driver from the direction shown by arrow A in FIG. Magnetic disk 30 inserted
Is a disk table assembly (disk holding mechanism)
11 are held in a state where their central axes coincide with each other. The disk table assembly 11 is rotatably supported on the surface of the main frame 13 via a spring 12. The disk table assembly 11 is rotationally driven by a motor (not shown) provided on the back surface of the main frame 13, so that the magnetic disk rotates. A board (not shown) on which a large number of electronic components are mounted is attached to the back surface of the main frame 13.

The magnetic disk driver has a magnetic head 14 for reading / writing data from / to the magnetic disk. The magnetic head 14 is held by a carriage 15. A combination of the magnetic head 14 and the carriage 15 is called a carriage assembly (magnetic head feeding mechanism). The carriage 15 is arranged on the surface of the main frame 13 so as to be separated from the main frame 13 as described later, and the magnetic head 14 is moved in a predetermined radial direction with respect to the magnetic disk (direction shown by arrow B in FIG. 4). Holds movably along.

A rear wall 131 of the main frame 13 is also provided.
A stepping motor 16 is fixed to the. The stepping motor 16 drives the carriage 15 along a predetermined radial direction B. More specifically, the stepping motor 16 has a rotating shaft (drive shaft) 161 extending in parallel with a predetermined radial direction B. A male screw is cut on the rotating shaft 161. The tip of the rotary shaft 161 passes through a hole 132a formed in a bent portion 132 that is erected by cutting and raising the main frame 13. By this hole 132a, the rotary shaft 161 is regulated so as to extend parallel to the predetermined radial direction B, and the tip end thereof is rotatably held.

On the other hand, the carriage 15 has an arm 151 extending from the carriage main body to the rotary shaft 161, and the tip of the arm 151 is a hook bent so as to fit into the valley portion of the male screw of the rotary shaft 161. It has a part 151a. Therefore, the rotary shaft 161 of the stepping motor 16
When is rotated, the hook portion 151a of the arm 151 is moved along the valley portion of the male screw of the rotation shaft 161, so that the carriage 15 itself moves along the predetermined radial direction B. Stepping motor 16 is carriage 1
5 serves as a driving means for moving 5 along a predetermined radial direction B.

Since the rotating shaft 161 of the stepping motor 16 is provided on one side of the carriage 15, one side of the carriage 15 is movably supported by the rotating shaft 161 while being separated from the main frame 13. However, it is not possible to dispose the entire carriage 15 away from the surface of the main frame 13 only by supporting the rotary shaft 161. Therefore, it is necessary to guide the carriage 15 while supporting it on the other side. This guide is the guide bar 17.

The guide bar 17 is provided on the opposite side of the rotation shaft 161 of the stepping motor 16 with the carriage 15 interposed therebetween. The guide bar 17 extends parallel to the predetermined radial direction B, and has one end 171 and the other end 172 fixed to the surface of the main frame 13 as described later,
The carriage 15 is guided along a predetermined radial direction B.
As a result, the entire carriage 15 is attached to the main frame 1
3 is located away from the surface.

The guide bar 17 is held on the surface of the main frame 13 by a guide bar clamp 18.
The guide bar clamp 18 is fixed to the surface of the main frame 13 by binding machine screws 19.

Since the guide bar clamp 18 merely clamps the guide bar 17, the guide bar 17 cannot be fixed to the surface of the main frame 13 only by this. For this reason, a pair of positioning members for regulating the positions of both ends 171 and 172 of the guide bar 17 are required. As the pair of positioning members, a pair of bent portions 201 'and 202' formed by cutting and raising a part of the main frame 13 on the surface side of the main frame 13 is used. The pair of bent portions 201 ′ and 202 ′ regulate the positions of both ends 171 and 172 of the guide bar 17, and cooperate with the guide bar clamp 18 to fix the guide bar 17 to the surface of the main frame 13.

The carriage 15 has a support frame 152 for slidably supporting the carriage body along the guide bar 17. The guide bar 17 is fitted in the support frame 152. Therefore, in this state, the carriage 1
When 5 slides along the guide bar 17, the support frame 15
2 contacts the main frame 13. In order to prevent this, a relief portion is formed in the main frame 13 at a position facing the guide bar 17. As the escape portion, a frame hole 21 'formed in the main frame 13
Are using.

By the way, the stepping motor 16 includes
As shown in FIGS. 11 and 12, a flange portion 16a extending in the radial direction is provided on the surface projecting the rotary shaft 161. The flange portion 16 a is arranged to face the rear wall 131 of the main frame 13. The flange portion 16a is formed on the rear wall 131 of the main frame 13 by a plurality of screws 70.
Is pressed against the stepping motor 16
Is fixed to the rear wall 131 of the main frame 13.

When adjusting the characteristics of the stepping motor 16, the plurality of screws 70 are loosened to remove the stepping motor 16
Is adjusted by rotating the rotary shaft 161 clockwise or counterclockwise.

By the way, there is an increasing demand for miniaturization of recent magnetic disk drivers. For this reason,
As shown in 0, the width dimension of the main frame 13 is slightly larger than the width dimension of the magnetic disk 30, and efforts have been made to minimize the dimension in the vertical (thickness) direction. Therefore, it is desirable that the depth dimension of the main frame 13 be as close as possible to the depth dimension of the magnetic disk 30.

[0014]

However, the stepping motor 16 has its characteristics adjusted by loosening these screws using at least two screws 70, and then tightening the screws again, the rear wall of the main frame 13. Since the work of fixing to 131 is required, there is a problem that work in a narrow space is difficult.

A space for installing the carriage 15, the stepping motor 16, and the rotary shaft 161 is required on the rear portion of the main frame 13, that is, on the rear wall 131 side. This space is defined by the distance L between the front end of the magnetic disk 30 and the rear wall 131, as shown in FIG. 10, and the distance L has been required to be 1 cm or more. Therefore, the conventional magnetic disk driver is
In particular, there was a limitation in reducing the dimension in the depth direction.

Therefore, an object of the present invention is to provide a magnetic disk driver capable of realizing a reduction in size in the depth direction and facilitating work such as fixing and adjusting a stepping motor fixed to a main frame. To do.

[0017]

According to the present invention, there is provided a disk holding mechanism for rotationally driving a magnetic disk while holding it , and a magnetic head feeding mechanism.
Mechanism is a stepping motor, said the feed screw is Installing the output shaft of the stepping motor, the said by mounting a magnetic head with engages the feed screw feeding the magnetic disk the magnetic head by rotation of the screw of which a carriage for moving in a radial direction, the di
Disk holding mechanism and the magnetic head feeding mechanism in a magnetic disk driver provided on the main frame, the stearate
Clamp member for fixing the topping motor, and one
And the stepping motor has a flange portion facing the main frame, and an assembly of the stepping motor and the feed screw is provided in the main frame on the side opposite to the insertion port of the magnetic disk. It is located at the back and adjacent to one of the left and right side edges of the main frame, and the clamp member has the flange portion at the front.
The arm part pressed against the main frame and the main part
An engaging portion that sandwiches and engages a side edge of the frame.
The lamp member is attached to the main frame by the one screw.
Thus , a magnetic disk driver characterized by being fixed is obtained.

[0018]

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic disk driver of the present invention will be described below with reference to the drawings. First, an embodiment of the magnetic disk driver of the present invention will be described with reference to FIGS. 1 and 2, the main frame 1
Is the width of the magnetic disk 30 and the depth is
Slightly larger than the depth dimension (however, within +10 mm)
To be The magnetic disk 30 is inserted into the magnetic disk driver main body from the direction shown by arrow A in FIG. The stepping motor 2 is fixed to a position adjacent to the left side wall among the side walls on both sides of the main frame 1 by utilizing a part of the rear wall 1-1.

The stepping motor 2 has a feed screw 2-1.
Is attached, and the tip thereof is rotatably supported by a support portion 1-2 formed by cutting and raising the main frame 1. The magnetic head 3 is attached to the feed screw 2-1.
Is partially engaged with the carriage 4. As a result, similarly to the conventional example shown in FIG. 9, the carriage 4 moves along the predetermined radial direction B of the magnetic disk 30 by the rotational movement of the feed screw 2-1.

A guide bar 5 is fixed to the main frame 1 by two supporting portions 1-3 formed by cutting and raising so as to extend parallel to the feed screw 2-1.

Next, the fixing structure of the main frame 1 and the stepping motor 2 will be described in detail.

A fixed wall 1-5, which is lower than the rear wall 1-1, is formed on the rear wall 1-1 adjacent to the left side wall of the side walls on both sides of the main frame 1. That is, the stepping motor 2 is arranged at the inner side of the main frame 1 on the side opposite to the insertion port of the magnetic disk and adjacent to the left side edge (see FIG. 1) of the main frame 1.

The stepping motor 2 has a feed screw 2-
As shown in FIGS. 3 and 4, a flange portion 2a having a diameter larger than the diameter of the stepping motor 2 is provided on the surface from which 1 is projected. The flange portion 2a is arranged to face the fixed wall 1-5. A part of the flange portion 2a is engaged with an engagement wall portion 1-6 which rises at a right angle from the side edge of the fixed wall 1-5. An engagement space 1-7 for engaging a part of the flange portion 2a is formed in the engagement wall portion 1-6.
The engagement space 1-7 is a portion formed with a slit or hole that is inserted through a part of the flange portion 2a and engaged therewith.

The other portion of the flange portion 2a opposite to a part of the flange portion 2a is pressed and fixed to the fixed wall 1-5 by the screw head of one screw 70. Screw is fixed wall 1-
It is screwed to 5. To adjust the characteristics of the stepping motor 2, loosen the screw 70 and then rotate the stepping motor 2 clockwise or counterclockwise for adjustment.

5 and 6 show a fixing structure of the stepping motor 2 according to another embodiment. The stepping motor 2 is fixed to the fixed wall 1-5 of the main frame 1 by a clamp member 80 having a central portion punched out to form a space S and a single screw 70. The clamp member 80 is the flange portion 2a of the stepping motor 2.
The pair of arms 80-1 whose diameter directions are orthogonal to each other are pressed against the fixed wall 1-5 with elastic force. Clamp member 8
A clamp member 80 is fixed to one end surface of 0 by fastening a screw 70 to the fixed wall 1-5. The other end of the clamp member 80 has an engaging portion 80-2 extending to the back surface of the fixed wall 1-5 and sandwiching and engaging the fixed wall 1-5.

A tongue piece 80-3 extending to the flange portion 2a is formed near the screw 70. Tongue 80-
3 presses the flange portion 2a toward the fixed wall 1-5 with an elastic force. To adjust the characteristics of the stepping motor 2, loosen the screw 70 and then rotate the stepping motor 2 clockwise or counterclockwise for adjustment.

FIG. 7 shows another embodiment of the engaging portion 80-2 of the clamp member 80 shown in FIG. The clamp member 80 is bent parallel to the end surface of the fixed wall 1-5, and a cut-and-raised portion 80-5 is formed in an end plate portion 80-4 extending from the end surface of the fixed wall 1-5. Cut and raised part 80
-5 is elastically engaged with the back surface of the fixed wall 1-5.

Next, the relationship between the carriage 4, the feed screw 2-1 and the guide bar 5 will be described with reference to FIG. The carriage 4 includes an upper carriage 41 and a lower carriage 42.
1. The magnetic heads 3a and 3b are attached to one end of the lower carriage 42, respectively. The upper carriage 41 can be opened upward in the drawing.
The magnetic disk (not shown) has an upper carriage 41.
Is inserted between the upper carriage 41 and the lower carriage 42, and after the insertion, the magnetic heads 3a and 3b come close to the magnetic disk.
It will be closed.

The upper carriage 41 is composed of a plate-shaped arm. On the other hand, the lower carriage 42
Is a flat plate 42-1 supporting the magnetic head 3b, and a protrusion 42-2 provided at the end opposite to the magnetic head 3b.
And the protrusion 42-2 is provided with an upper carriage 4
1 is combined with the projecting portion 41-2 connected to the No. 1 via the metal connecting plate 41-1. The protruding portion 41-2 is fixed together with the protruding portion 42-2, and is provided with a spring mounting portion 41-3 protruding rightward in FIG. Spring mounting part 41
From -3, a round bar-shaped spring support portion 41-4 projects forward in the drawing, and a spring 41-5 for urging the upper carriage 41 downward in the drawing is attached to the spring support portion 41-4. Has been.

The connecting plate 41-1 is provided with a protrusion 4 by means of two screws.
It is fixed by a pressing plate 41-6 attached to the upper surface of 1-2. 41-7 is a pin for positioning the pressing plate 41-6.

The upper carriage 41 is adapted to be opened upward by a disc holder plate (not shown) before inserting the magnetic disc. When the magnetic disk is inserted, the disk holder plate moves downward, and as a result, the upper carriage 41 is closed downward by the spring 41-5 and the magnetic head 3a approaches the magnetic disk. When the magnetic disk is ejected, the upper carriage 41 is kept open upward by the disk holder plate moving upward.

Next, a space is formed between the protruding portion 41-1 and the protruding portion 42-2, and the feed screw 2-1 is inserted into this space. Moreover, in this space, a metal member (not shown) fitted in the valley portion of the feed screw 2-1 is provided. In this way, the carriage 4 is similar to the carriage 15 described in FIG.
By the rotation of the feed screw 2-1, it moves in the axial direction.

A thick portion 42-3 is provided in the middle of the lower carriage 42 in parallel with the feed screw 2-1, and the guide bar 5 is provided in a through hole provided in the thick portion 42-3. It is slidably inserted. Thereby, the guide bar 5 guides the movement of the carriage 4. The punched hole 1 is formed in the main frame 1 corresponding to the movement range of the thick portion 42-3 so that the protruding portion of the thick portion 42-3 does not contact the main frame 1 and hinder the movement of the carriage 4.
-9 (see FIG. 2) is formed. This also prevents the dimension of the magnetic disk driver from increasing in the vertical direction (thickness direction) due to the protruding portion of the thick portion 42-3.

In the conventional magnetic disk driver described with reference to FIG. 10, the center of the disk table assembly 11 is on the center line (indicated by a chain line) in the depth direction of the magnetic disk driver. On the other hand, in the magnetic disk driver according to the present invention, as shown in FIG. 2, the center of the disk table assembly 11 is displaced to the right in the drawing from the center line (shown by a chain line) in the depth direction of the magnetic disk driver. . In this way, as shown in FIG. 1, the left side edge of the main frame 1 and the magnetic disk 30.
The feed screw 2-1 is arranged by utilizing a slight space formed between the left side edge and the left side edge.

In the magnetic disk driver of the present invention described above, the stepping motor 2 and the feed screw 2-1 are provided on the inner side of the main frame 1 and adjacent to one of the side edges, and the carriage 3 is provided. By extending in a direction perpendicular to the depth direction and further moving in the depth direction, the dimension in the depth direction can be shortened by 10 mm or more as compared with the conventional magnetic disk driver shown in FIG.

[0037]

The magnetic disk driver according to the present invention is
Since the stepping motor can be provided on the back side of the main frame and adjacent to one of the stepped portions of both side edges, the stepping motor can be fixed to the main frame with a single screw. The space can be saved, and the stepping motor can be installed even in a narrow space.

Further, the magnetic disk driver according to the present invention can realize a reduction in size particularly in the depth direction, and can provide a magnetic disk driver that meets the demand for miniaturization.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing a main part of a magnetic disk driver according to the present invention together with a magnetic disk.

FIG. 2 is a plan view showing the magnetic disk driver shown in FIG. 1 without a magnetic disk.

3 is a plan view showing a fixing structure of a stepping motor used in the magnetic disk driver shown in FIG.

4 is a side view of a fixing structure of the stepping motor shown in FIG.

5 is a plan view showing another fixing structure of the stepping motor used in the magnetic disk driver shown in FIG. 1. FIG.

6 is a side view of the fixing structure of the stepping motor shown in FIG.

7 is a plan view showing still another fixing structure of the stepping motor used in the magnetic disk driver shown in FIG. 1. FIG.

8 is a perspective view showing a driving and guiding structure of the carriage shown in FIG.

FIG. 9 is an exploded perspective view showing a main part of a conventional magnetic disk driver.

10 is a plan view schematically showing a main part of the magnetic disk driver shown in FIG. 9 together with a magnetic disk.

11 is a side view showing a fixing structure of a stepping motor used in the magnetic disk driver shown in FIG.

12 is a plan view of a fixing structure of the stepping motor shown in FIG.

[Explanation of symbols]

1 mainframe 1-5 Fixed wall 1-6 Engagement wall 1-7 Engagement space 2 stepping motor 2a Flange part 3 magnetic head 4 carriage 5 Guide bar 30 magnetic disk 70 screws 80 Clamping member 80-1 Arm part 80-3 tongue

Continuation of the front page (72) Inventor Yoshiaki Aboshi, No. 1-1 Bandai Bandai, Tendo City, Yamagata Prefecture (56) References JP-A-2-29972 (JP, A) JP-A-8-129839 (JP, A) JP 5-250820 (JP, A) JP 4-168685 (JP, A) JP 62-149078 (JP, A) Actually open 3-20068 (JP, U) Actually open 61 −24862 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 21 / 00-21 / 06

Claims (3)

(57) [Claims] 1. A disk holding mechanism for rotating and holding a magnetic disk, and a magnetic head feeding mechanism.
Seen, the magnetic head feed mechanism and the stepping motor, the <br/> a feed screw is Installing the output shaft of the stepping motor, the feed screw equipped with a magnetic head with which engages the feed screw And a carriage for moving the magnetic head in the radial direction of the magnetic disk by the rotation of the disk, the disk holding mechanism and the magnetic head.
In order to fix the stepping motor in the magnetic disk driver with the drive mechanism installed in the main frame
And a single screw, the stepping motor has a flange portion facing the main frame, and the stepping motor and the feed screw are combined.
The three-dimensional insertion opening of the magnetic disk is located adjacent to one of the left and right side edges of the main frame to a rear portion of the main frame opposite to the clamp portion
Material presses the flange part to the main frame
Engages with the arm part by sandwiching the side edge of the main frame.
An engaging portion, and the clamp member includes the main frame.
A magnetic disk driver, wherein the magnetic disk driver is fixed to the frame by the one screw . 2. The clamp member comprises the arm portion.
The flange that is pressed against the main frame
The tongue that presses the other part of the part against the main frame
Magnetic disk driver according to claim 1, characterized in that it has. 3. The engaging portion is a side edge of the main frame.
The end plate portion is bent parallel to the end face, and the end plate portion is
Cut and raise the main frame from the back side
Magnetic disk driver according to claim 1, characterized in that it has a to portion.