JP2002288950A - Recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording and reproducing device without causing misalignment of a magnetic head by surely fixing a stepping motor for controlling a magnetic head position to the casing without increasing its cost. SOLUTION: The stepping motor 24 for controlling the position of the magnetic head is fixed to the casing by using a clamp 28 permitting to fix it at least at three points in an area over an angular range of 180 degrees viewing from the center of the stepping motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a recording / reproducing apparatus, and more particularly to recording / reproducing a signal by moving a head by driving a stepping motor in a radial direction of a recording medium such as a floppy (registered trademark) disk. The present invention relates to a recording / reproducing apparatus configured as described above.

[0002]

2. Description of the Related Art In a recording / reproducing apparatus for a recording medium such as a floppy disk, a head such as a magnetic head approaches a loaded recording medium and the head is moved to a carriage in order to drive the head in a radial direction of the recording medium. The carriage is mounted, and the carriage is moved in the radial direction (tracking direction) of the disk-shaped recording medium. In order to move the head, a stepping motor is used. According to a conventional technique, as shown in FIG. 7, a casing (chassis) is formed by a clamp whose flange is a substantially U-shaped fixture. Attached and fixed. That is, the clamp is substantially U-shaped, the base of which is screwed to the casing, and the tip of the two branches forming the substantially U-shape fixes the stepping motor in such a manner that the flange is pressed against the surface of the casing. I have. According to another conventional technique (Japanese Patent Laid-Open No. 2000-3565), a flange of a stepping motor is fixed to a casing with two screws as shown in FIG.

[0003]

According to the prior art of FIG. 7 described above, the stepping motor is substantially U-shaped.
Since the casing is fixed at the tips of the two branch portions of the clamp, which is a character-shaped fixing bracket, the fixing force is easily affected by the strength and dimensions of the clamp, and there is a problem that there are many variations. That is, if the strength and dimensions of the clamp are not appropriate, the stepping motor cannot be fixed with sufficient force, and the stepping motor itself rotates due to an external force such as an impact during use, and the exact position of the magnetic head is The situation that control becomes impossible occurs.

On the other hand, the prior art shown in FIG. 8 is a good measure for more secure fixing because the stepping motor is fixed at two places by screws, but increases the cost because parts and labor are increased accordingly. There is a problem. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a recording / reproducing apparatus in which a stepping motor for controlling the position of a magnetic head is securely fixed to a casing without increasing the cost, so that no displacement occurs. .

[0005]

In order to achieve the above object, according to the present invention, a stepping motor for controlling the position of a magnetic head is fixed at at least three points in an area covering an angle range of approximately 180 degrees as viewed from the center of the stepping motor. It is designed to be fixed to the casing by using a clamp that can be used.

That is, according to the present invention, a casing, a magnetic head for accessing a recording medium loaded in the casing, a carriage for holding the magnetic head, and sliding the carriage in a radial direction of the cartridge recording medium. In a recording / reproducing apparatus having a stepping motor to be moved and a substantially U-shaped clamp for pressing and fixing a flange of the stepping motor against the casing, the clamp has an angle of about 180 degrees as viewed from the center of the stepping motor. A recording / reproducing apparatus is provided, wherein the recording / reproducing apparatus is configured to press the flange against the casing at at least three points in an area over a range.

According to this configuration, the stepping motor can be securely fixed to the casing without increasing the cost, and there is no problem in that the displacement of the stepping motor is caused and the position control of the magnetic head is not hindered.

Further, in the present invention, the substantially U-shaped clamp has a projection projecting from a central portion of a portion forming the U-shape to an internal space surrounded by the U-shaped portion.

According to this configuration, the intervals between the three support points are substantially the same, and sufficient fixation can be performed efficiently with only the three support points.

Further, in the present invention, the substantially U-shaped clamp includes a base portion screwed to the casing in a free state before the stepping motor is fixed, and a base in the thickness direction from the base portion. And the step section
The protrusion extending from the step portion and the two branch portions forming the U-shape, the tip of the two branch portions is more thicker than the tip of the protrusion from the most lifted portion of the step portion. Extending far in the direction.

According to this configuration, when fixing the stepping motor, when the base portion is fixed to the casing with a screw, the tips of the two branch portions first come into contact with the flange of the stepping motor, and the fixing is performed. The flange is pressed by the tip, and the stepping motor can be firmly fixed.

Further, in the present invention, the substantially U-shaped clamp includes a base portion screwed to the casing in a free state before fixing the stepping motor, and a thickness direction in the thickness direction from the base portion. A first step portion raised by a predetermined distance, the protrusion extending from the first step portion, and two second portions raised from the both end portions of the base portion by a distance larger than the predetermined distance in a thickness direction thereof. A step portion, and two branch portions forming the U-shape extending from the second step portion, respectively, and the tip of the two branch portions is closer to the second step than the tip of the projection from the base portion. And extending far away in the thickness direction opposite to the section.

According to this configuration, when fixing the stepping motor, when the base is fixed to the casing with a screw, the tips of the two branches first come into contact with the flange of the stepping motor, and then the protrusion is fixed. The flange is pressed by the tip, and the stepping motor can be firmly fixed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a first embodiment of a recording / reproducing apparatus according to the present invention, FIG. 2 is a perspective view showing a state of mounting a stepping motor in FIG. 1, and FIG. 3 is a stepping motor in FIG. FIG. 4 is a schematic exploded perspective view showing a state before the clamp is attached to the motor, FIG. 4 is a rear view showing a state where the stepping motor is fixed by the clamp of FIG. 3, and FIG. 5 is a first embodiment of FIGS. FIG. 6 is a side view of a clamp used in the embodiment, FIG. 6 is a diagram showing a clamp used in the second embodiment, FIG.
Is a perspective view showing a conventional fixing method, and FIG. 8 is a perspective view showing another conventional fixing method.

In FIG. 1, a floppy disk device as a recording / reproducing device includes a base 1 as a chassis.
0 and a cover 12 as a housing cover constitute a casing. A panel 44 is attached to the front of the casing, and a shutter 46 that opens and closes an opening of the panel 44 is attached to the panel 44. The base 10 has a spindle motor 22 for rotating and driving a floppy disk.
Is attached. A control printed circuit board 14 in which a control circuit is incorporated is attached to the base 10.

A clamp 2 in which a stepping motor 24 for driving a carriage 30, which will be described later, functions as a fixture.
8 attached to the rear of the base 10. The carriage 30 includes the guide rod 3 fixed to the base 10.
The carriage 30 can be moved in the radial direction of the floppy disk along 4 and the screw shaft 26 of the stepping motor 24 and the rear part of the carriage 30 are screwed together, so that the rotation of the screw shaft 26 moves the carriage 30. The fine adjustment of the position of the carriage 30 is performed by the stepping motor 2.
4 is rotated. A magnetic head (not shown) is attached to the carriage 30, and other magnetic heads are also attached, and an arm 32 is attached to the carriage 30. A holder 16 is attached to the cover 12 so as to be vertically movable. The holder 16 has left and right holding portions for holding a floppy disk (not shown) on both sides.

As shown in detail in FIG.
A base portion 28A, a step portion 28C lifted from the base portion 28A in the thickness direction, and two branch portions 27A and 27B extending from the step portion 28C to form a U-shaped portion;
A projection 29 is provided at the center of the U-shaped portion and extends into the internal space of the U-shaped portion. Further, a through hole 28B through which the screw 31 passes is provided in the base portion 28A.

The clamp 28 fixes the flange 25 of the stepping motor 24 by pressing it against the surface of the base 10 as follows. That is, the screw 31 is connected to the base 28A.
Is inserted into the through hole 28 </ b> B and screwed into a female screw portion (not shown) provided on the base 10. FIG. 4 shows that the flange 25 of the stepping motor 24 is pressed by the two branches 27A and 27B and the protrusion 29, and as a result, the base 10
(See FIG. 2). FIG. 5 is a side view showing a state before the clamp 28 according to the first embodiment is attached. Since the clamp 28 is made of an elastic metal, when the clamp 28 is attached to the base 10 with the screw 31 as shown in FIG. 2, the two branch portions 27A and 27B and the projection 29 are elastically deformed to reduce the pressing force. appear. In FIG. 4, a mark “x” schematically shows a pressing portion (contact portion). That is, when the clamp 28 is attached to the base 10 by the screw 31, the two branch portions 27A,
Flange 2 is formed by the respective tips of 27B and projection 29.
5 is pressed and fixed. These pressing portions are substantially 1 when viewed from the center O of the stepping motor 24.
It exists within an angle range of 80 degrees.

Next, a second embodiment of the present invention will be described. The second embodiment is the same as the first embodiment except that the shape of the clamp 28 is different from that of the first embodiment. FIG. 6 shows a clamp 2 according to the second embodiment.
8 (a) is a front view, (b) is a plan view,
(C) is a side view. In the first embodiment shown in FIGS. 1 to 4, the step portion 28 </ b> C is formed uniformly, but in the second embodiment, the step portion is
A, 27B and the protrusion 29 are provided on each of the branch portions 27A, 27B and the protrusion 29.
Is different. Also, the distances at which the tips of the branch portions 27A and 27B and the protrusion 29 are apart from the base portion 28A are different.

That is, the U-shaped clamp 28 of the second embodiment lifts from the base portion 28A by a predetermined distance in the thickness direction in a free state before fixing the stepping motor 24. Step part 28C3 and the first
A protrusion 29 extending from the step portion 28C3;
8A, two second step portions 28C lifted from both ends by a distance greater than the predetermined distance in the thickness direction.
1, 28C2 and two branches 27A forming a U-shape extending from the second step portions 28C1, 28C2, respectively.
27B, two branches 27A from the tip of the projection 29,
The tip of 27B extends from the base 28A to the second step 2
It extends far in the thickness direction opposite to 8C1 and 28C2.

In the second embodiment, the stepping motor 24 is fixed as follows. First, when the screw 31 is tightened, first, the two branch portions 27A and 27B contact the flange 25, and as the screw 31 is tightened,
The tips of the two branch portions 27A, 27B press and fix the flange 25. When the screw 31 is further tightened, the protrusion 2
As the tip of 9 touches the flange 25 and the screw 31 is tightened, the tip of the projection 29 presses the flange 25 to fix it at this portion. In the second embodiment, the reason why the projection 29 finally presses the flange 25 is that the projection 29 is close to the base portion 28A, so that the pressing force by the projection 29 is reduced to the two branch portions 27A and 27B. When the fine adjustment of the position of the carriage 30 is performed by rotating the stepping motor 24, the screw 3
Since the two branches 27A and 27B press the flange 25 even when the projection 29 is not in contact with the loosened 1,
Stable adjustment is possible without the flange 25 floating from the base 10.

In the second embodiment, the step portions are provided on each of the branch portions 27A and 27B and the projection 29, and the degree of the swell is determined by the branch portions 27A and 27B.
And the protrusion 29, the swelling of the step portion is similar to that of the first embodiment.
It is also possible to make the height the same as the height of the protrusion 29 and change only the degree of extension in the thickness direction in the direction opposite to the swelling therefrom.

In each of the above embodiments, as shown in FIG. 4, the tips of the branches 27A and 27B are located at an angle of about 180 degrees when viewed from the center O of the stepping motor 24. , 27B are further extended so that their positions are 18 degrees from the center O of the stepping motor 24.
It can also be at an angular position exceeding 0 degrees.
With such a configuration, each branch 2
Since the tips of 7A and 27B are further away from the projection 29,
The stepping motor 24 can be fixed more stably. Accordingly, the stepping motor 24 referred to in the present invention
Should be understood as an angle range including up to several tens of degrees, not a narrow angle range of around 180, as viewed from the center O of FIG.

The above embodiment has been described by taking a floppy disk device as an example of a recording / reproducing device. However, a predetermined head is received by receiving a cartridge of a recording medium of another recording system such as an optical disk or a magneto-optical disk (MO). The present invention is applicable to other disk devices that guide the position.

[0025]

As described above, according to the present invention, since the clamp is configured to press the flange against the casing at at least three points in a region covering an angle range of approximately 180 degrees as viewed from the center of the stepping motor, The stepping motor can be securely fixed to the casing without increasing the cost, and there is no problem in that the position of the stepping motor is displaced and the position control of the magnetic head is not hindered.

In the present invention, the substantially U-shaped clamp has a projection projecting from the center of the U-shaped portion to the internal space surrounded by the U-shaped portion. The intervals between the points are substantially the same, and sufficient fixing can be performed efficiently with only the three support points.

In the present invention, the substantially U-shaped clamp is
In a free state before fixing the stepping motor, a base portion screwed to the casing, a step portion raised from the base portion in the thickness direction, a projection extending from the step portion, and a U-shape are formed. With two branches,
Since the tips of the two branch portions extend farther in the thickness direction from the most raised portion of the step portion than the tip of the projection, when fixing the stepping motor, fixing the base portion to the casing with a screw 2 The ends of the two branches first contact the flange of the stepping motor to be fixed, and then the flanges are pressed by the ends of the projections, so that the stepping motor can be firmly fixed.

Further, in the present invention, the substantially U-shaped clamp is
In a free state before fixing the stepping motor, a base portion screwed to the casing, a first step portion lifted from the base portion by a predetermined distance in a thickness direction thereof, and extended from the first step portion. It has a protrusion, two second step portions lifted from both ends of the base portion by a distance greater than a predetermined distance in a thickness direction thereof, and two branch portions forming a U-shape extending from the second step portions, respectively. And
The tip of the two branches is second from the base than the tip of the projection.
Since it extends far in the thickness direction opposite to the step, when fixing the stepping motor, the tip of the two branches first contacts the flange of the stepping motor when fixing the base to the casing with screws. Then, the flange is pressed by the tip of the projection, and the stepping motor can be firmly fixed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing how the stepping motor shown in FIG. 1 is attached.

FIG. 3 is a schematic exploded perspective view showing a state before a clamp is attached to the stepping motor of FIG. 2;

FIG. 4 is a rear view showing a state where the stepping motor is fixed by the clamp of FIG. 3;

FIG. 5 is a side view of the clamp used in the first embodiment of FIGS.

FIG. 6 is a diagram showing a clamp in a second embodiment of the recording / reproducing apparatus according to the present invention, wherein (a) is a front view, (b) is a plan view, and (c) is a side view.

FIG. 7 is a perspective view showing a conventional fixing method.

FIG. 8 is a perspective view showing another conventional fixing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Base 12 Cover (a casing is comprised with a base) 16 Holder 22 Spindle motor 24 Stepping motor 25 Flange 26 Screw shaft 27A, 27B Branch part 28 Clamp 28A Base part 28B Through hole 28C Step part 29 Projection 30 Carriage 31 Screw 32 Arm 44 Panel 46 Shutter

Claims (4)

[Claims] A magnetic head for accessing a recording medium loaded in the casing; a carriage for holding the magnetic head; a stepping motor for sliding the carriage in a radial direction of the cartridge recording medium; A substantially U-shaped clamp for pressing and fixing a flange of the stepping motor against the casing, wherein the clamp has at least 3 in an area covering an angle range of about 180 degrees when viewed from the center of the stepping motor. A recording / reproducing apparatus characterized in that the flange is pressed against the casing at a point. 2. The U-shaped clamp according to claim 1, wherein the substantially U-shaped clamp has a projection projecting from a central portion of the U-shaped portion to an internal space surrounded by the U-shaped portion. 2. The recording / reproducing apparatus according to 1. 3. The substantially U-shaped clamp is lifted in a thickness direction from the base portion screwed to the casing and the base portion in a free state before fixing the stepping motor. A step portion, the protrusion extending from the step portion, and two branch portions forming the U-shape, the tip of the two branch portions being the most lifted portion of the step portion from the tip of the protrusion 3. The recording / reproducing apparatus according to claim 2, wherein the recording / reproducing apparatus extends far from the thickness direction. 4. The substantially U-shaped clamp includes a base that is screwed to the casing in a free state before fixing the stepping motor, and a predetermined distance from the base in a thickness direction thereof. A first step portion raised only by the first step portion, the protrusion extending from the first step portion, and two second step portions lifted from both ends of the base portion by a distance larger than the predetermined distance in a thickness direction thereof. ,
It has two branches forming the U-shape extending from the second step, respectively, and the ends of the two branches are more opposite to the second step from the base than the ends of the protrusions. 3. The recording / reproducing apparatus according to claim 2, wherein the recording / reproducing apparatus extends far in the thickness direction.