JP3701867B2 - Carriage latch mechanism of magnetic head and magnetic disk device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a carriage latch mechanism for holding a carriage unit so that the magnetic head supported by the carriage unit does not fall off from the retracted position when an impact is applied to the magnetic disk device, and a magnetic disk having the latch mechanism Relates to the device.
[0002]
[Prior art]
Conventionally, in an information processing apparatus such as a personal computer, a magnetic disk device is used as an information recording / reproducing apparatus. The magnetic disk device has a disk-shaped recording medium provided rotatably and a magnetic head supported by an actuator called a carriage, and the magnetic head is positioned on the rotating recording medium by the carriage, Reading / writing of recording to a recording medium is performed. At the time of this read / write, the magnetic head is levitated from the recording medium by the rotation of the recording medium.
[0003]
In recent years, magnetic disk devices are increasingly used in notebook personal computers and mobile terminals, and impact resistance has become an important factor as required performance of magnetic disk devices. One of the things that must be avoided when an impact is applied is damage to the magnetic head or recording medium due to contact between the magnetic head and the recording medium.
[0004]
Particularly in recent years, the recording density has been increased, and accordingly, the flying height of the magnetic head needs to be reduced, so that the smoothness of the recording medium has been increased. For this reason, if the magnetic head is positioned on the recording medium while the rotation of the recording medium is stopped, the magnetic head is attracted to the recording medium and becomes inoperable. Therefore, it is necessary to retract the magnetic head from the data area of the recording medium when not operating.
[0005]
The magnetic head retracting method is roughly divided into two methods, a CSS (Contact Start Stop) method and a ramp load method. The CSS system is a system in which a retreat position is set in a part of the recording medium (usually the innermost circumference of the recording medium in many cases), and the magnetic head is retreated to this retreat position. In particular, the CSS system uses a zone texture medium in which minute protrusions and grooves are provided at the retracted position and the smoothness at the retracted position is intentionally reduced, thereby avoiding the magnetic head from being attracted. On the other hand, in the ramp load system, a ramp is provided outside the recording medium, and a load bar is provided at the tip of the suspension supporting the magnetic head. This is a method of completely retracting to the outside.
[0006]
In either method, when the magnetic head moves from the retracted position, the magnetic head is attracted onto the recording medium. Therefore, a latch mechanism for preventing the magnetic head from dropping off from the retracted position even when an impact is applied becomes very important.
[0007]
Conventionally, as such a latch mechanism, there is a mechanism in which a magnetic body is provided on the carriage side and the carriage is fixed (latched) to a retracted position by a permanent magnet.
[0008]
  However, in the above-described latch mechanism, when performing a read / write operation, the latch must be released by the driving force of the carriage actuator that drives the carriage, and the latching force for fixing the carriage is less than the force of the carriage actuator. There must be. Carriage fixing force that can withstand large impactsTheIt is difficult to get. On the other hand, from the viewpoint of contact between the magnetic head and the recording medium, speed control when loading the magnetic head onto the recording medium is very important. However, when the latch force of the carriage due to magnetic force is sufficiently large so that the carriage latch is not released due to an impact, it is extremely difficult to release the latch of the carriage with the carriage actuator and control the load speed of the magnetic head. It is difficult to.
[0009]
Therefore, as another latch mechanism, the structure uses a wind force generated by the rotation of the spindle during operation to release the latch, and during non-operation, the latch mechanism is restored to the latch position by a spring member or magnetic force so that the latch always operates. There are things. This mechanism has a relatively simple structure and can be realized without much cost, and its effect has been confirmed, but sufficient wind power can be obtained with a device with a low spindle rotation speed or a device with a small recording medium diameter. In many cases, it is used in a magnetic disk device having a diameter of 3.5 inches or more.
[0010]
As another latch mechanism, the latch is normally released and the carriage can freely move. However, when a rotational acceleration is applied that causes the carriage to drop from the retracted position, the latch mechanism operates at that acceleration, and the carriage There is also a mechanism called an inertia latch system that prevents the carriage from rotating and dropping out of the retracted position by being caught by the claw.
[0011]
Several examples of a conventional latch mechanism using an inertia latch system will be described.
[0012]
In the example shown in FIG. 12, a carriage claw 105a is formed at the end of the carriage 105 opposite to the end supporting the magnetic head 109, and the carriage claw 105a is rotatable around a shaft 115. The latch 105 is configured to prevent the carriage 105 from falling off the ramp 104 by engaging a latch claw 121 provided at the tip of the latch member 120.
[0013]
That is, as shown in FIG. 12A, in a state where the magnetic head 109 is positioned on the ramp 104, the carriage claw 105a and the latch claw 121 are not engaged. In this state, an impact or the like is applied to the magnetic disk device, and as shown in FIG. 12B, rotational acceleration is generated in the counterclockwise direction around the shaft 106 that rotatably supports the carriage 105. Then, the latch member 120 also rotates in the same direction as the carriage 105 around the shaft 115. As a result, the latch claw 121 engages with the carriage claw 105 a, the rotation of the carriage 105 is prevented, and the magnetic head 109 can be prevented from falling off the ramp 104.
[0014]
However, contrary to the case shown in FIG. 12B, when the clockwise rotational acceleration acts on the carriage 105, the carriage 105 collides with the stopper 117 as shown in FIG. Due to the rebound, this time it rotates counterclockwise. On the other hand, the latch member 120 rotates clockwise, and the latch claw 121 is separated from the carriage 105.
[0015]
Therefore, the carriage 105 rotates without being blocked by the latch member 120, and the magnetic head 109 falls off the ramp 104. That is, in the example shown in FIG. 12, the latch mechanism functions only when the carriage 105 rotates in one direction, and the reliability as the latch function is low.
[0016]
In the example shown in FIG. 13, the latch member 150 is provided with an arc-shaped slit 151 centered on the shaft 145, and the engaging pin 155 provided on the carriage 135 is received by the slit 151. Further, in order to move the magnetic head 139 onto the recording medium 132 during the read / write operation, the slit 151 is formed with a notch 151 a for allowing the engagement pin 155 to escape from the slit 151. In a state where no impact or the like is applied (initial state), the latch member 150 is in the initial position shown in FIG. 13A, and the magnetic head 139 can move onto the recording medium 132 from the retracted position. According to such a configuration, as shown in FIG. 13B, even when clockwise rotational acceleration acts on the carriage 135 and the latch member 150, the engagement pin 155 is moved from the slit 151 by the rotation of the latch member 150. Since it cannot come out, the counterclockwise rotation of the carriage 135 due to the carriage 135 colliding with the stopper 147 can be prevented. That is, the latch mechanism functions as long as the latch member 150 rotates, regardless of which direction the carriage 135 rotates.
[0017]
However, in this mechanism, since it is necessary to provide the arc-shaped slit 151 in the latch member 150, the size of the latch member 150 is increased. Further, in order to reliably prevent the rotation of the carriage 135 due to an impact or the like, it is desirable to rotate the latch member 150 at a high speed and greatly. For this purpose, the distance from the shaft 145 to the slit 151 may be increased and the length of the slit 151 may be increased, but this also results in an increase in the size of the latch member 150. Therefore, the configuration shown in FIG. 13 is not practical in a magnetic disk device that is required to be downsized.
[0018]
The example shown in FIG. 14 solves the drawbacks of the above two examples, and the latch member 180 is provided with a first latch arm 180a and a second latch member 180, which are rotatably provided around shafts 145a and 145b, respectively. The latch arm 180b. A latch claw 181 that engages with the carriage claw 165a provided on the carriage 165 is provided on the second latch arm 180b. Further, the first latch arm 180a includes a first auxiliary claw 182a that pulls the second latch arm 180b and rotates it counterclockwise by rotating the first latch arm 180a counterclockwise, A second auxiliary claw 182b that pushes the second latch arm 180b and rotates it counterclockwise when the one latch arm 180a rotates clockwise is integrally provided.
[0019]
In the initial state, as shown in FIG. 14 (a), the first latch arm 180a and the second latch arm 180b are respectively held in the initial position by a position restricting member (not shown) using a spring or a magnetic force. The carriage claw 165a and the latch claw 181 are not engaged. In this state, when counterclockwise rotational acceleration acts on the carriage 165, as shown in FIG. 14B, the first latch arm 180a also rotates counterclockwise and the first auxiliary pawl 182a is moved to the first position. The second latch arm 180b is rotated counterclockwise by engaging with the second latch arm 180b. As a result, the latch claw 181 engages with the carriage claw 165a, and the rotation of the carriage 165 counterclockwise is prevented. Conversely, when a clockwise rotational acceleration acts on the carriage 165, as shown in FIG. 14C, the carriage 165 collides with the stopper 177 and rotates counterclockwise by rebounding at that time. On the other hand, the first latch arm 180a rotates clockwise, and the second latch arm 180b is pushed and rotated counterclockwise by the second auxiliary claw 182b. As a result, the latch claw 181 engages with the carriage claw 165a and the carriage 165 is prevented from rotating.
[0020]
As described above, according to the mechanism shown in FIG. 14, the latch pawl 181 works with respect to bidirectional rotational acceleration, so that the carriage 165 can be more reliably prevented from falling off.
[0021]
[Problems to be solved by the invention]
However, in the latch mechanism as shown in FIG. 14, the latch member is composed of two latch arms, and accordingly, the shaft that rotatably supports the latch arm and the latch arm when the latch is not in operation are arranged. A position regulating member that maintains the neutral position is required for each latch arm. Therefore, the number of parts increases, and the assembly man-hours and management man-hours at the time of manufacture increase accordingly, resulting in an increase in cost.
[0022]
In the inertia latch system, since the carriage and the latch member generally rotate with the same rotational acceleration, in order to engage the carriage claw and the latch claw before the magnetic head comes off the ramp, the carriage claw and the latch claw The positional relationship of is very important. That is, before the carriage pawl passes due to the rotation of the carriage, the positional relationship between the two in the standby state must be set so that the latch pawl is positioned on the trajectory of the carriage pawl.
[0023]
For this purpose, the latch member needs to be assembled with high positional accuracy. In particular, when the latch member is composed of two latch arms as shown in FIG. 14, the first latch for rotating the second latch arm as well as the second latch arm provided with the latch pawl is used. The arm must also be assembled with high positional accuracy. Conventionally, the latch mechanism is provided on the magnetic circuit for driving the carriage. However, in this method, the mounting tolerance between the magnetic circuit and the carriage is added, and the relative positional accuracy between the carriage and the latch mechanism is increased. It was hard to get out.
[0024]
An object of the present invention is to provide a carriage latch mechanism and a magnetic disk device capable of reliably latching a carriage with a simple structure against an external impact. Another object of the present invention is to provide a carriage latch mechanism and a magnetic disk device which can be easily assembled with a small number of parts, and with ease of mounting position accuracy of parts during assembly.
[0025]
[Means for Solving the Problems]
  In order to achieve the above object, the carriage latch mechanism of the present invention is pivotally supported so as to be swingable within a range that supports the magnetic head and includes the retracted position.In order to hold one end of the swing range as the retracted position, it is abutted against the carriage first stopper.A carriage latch mechanism for holding the carriage means so as not to drop out of the retracted position when an external force is applied,
  A single latch member provided with a latch claw that is pivotally supported in the same plane as the carriage means and protrudes with respect to the plane;
  The carriage means includes a latch pawl when the carriage means is in the retracted position.positionSlits are formed,
  The slit is located in front of the latch member.It is the position when no external force is appliedWhen in the initial position, the carriage means can freely swing within the range without interfering with the latch pawl., Formed in an arc shape around the rotation center of the carriage meansAn escape portion and a bent portion extending from the escape portion,The latch claw is rotated by rotating the carriage means and the latch member by the external force.A contact surface that abuts against the carriage means and prevents rotation of the carriage means, and a facing surface that faces the contact surfaceIncluding holding partSee
  The latch member is a latch member for holding, as the initial position, one end on the rotation direction side that is the same as the rotation direction of the carriage means when the carriage means is abutted against the carriage first stopper in the swing range. It has a latch side abutting part that abuts against the stopper.And features.
  In the carriage latch mechanism of the present invention, in the above invention, the latch member is rotatable in both directions at the initial position, instead of the latch member having a latch side abutting portion, and the holding portion However, the relief part is provided symmetrically on both sides of the relief part.
[0026]
Further, the magnetic disk device of the present invention includes a disk-shaped recording medium provided so as to be rotationally driven,
A magnetic head is supported and within a range including a retraction position where the magnetic head is retreated from the recording medium and a position where the magnetic head is on the recording medium within the same plane as the rotation surface of the recording medium. A carriage means pivotally supported by the shaft;
Driving means for driving the carriage means to position the carriage means at a predetermined position on the recording medium;
A carriage latch mechanism according to the present invention.
[0027]
  In the carriage latch mechanism of the above invention, when the carriage means is not in operation, the latch claw provided on the latch member is formed in the slit formed on the carriage means and having the relief portion and the holding portion.Approachdoing. Usually, the latch claw is located in the relief portion, and the carriage means can perform a normal operation. When an external force that rotates the carriage means is applied in this state, the latch member also starts to rotate in the same manner as the carriage means, and the latch claw moves to the holding portionApproachTo do. Since the holding part is bent and extended with respect to the relief part, as long as the above external force is applied, the latch claw is attached to the holding part.ApproachThe carriage means is prevented from further rotation and the carriage means is latched. Moreover, since the latch pawl and the slit are engaged, the latch of the carriage means does not depend on the direction of rotation. As described above, since the latch member is provided with a latch claw and a slit for engaging the latch claw is provided in the carriage means, a small carriage latch mechanism can be achieved.
  In particular, in a configuration in which the latch member has a latch-side abutting portion, the carriage means and the latch member are abutted against and held by the carriage first stopper and the latch member stopper, respectively, when no external force is applied. Here, when an external force is applied to rotate the carriage means in a direction in which the carriage-side abutting portion is separated from the carriage first stopper, the latch member also rotates in the same direction, and the carriage means is latched as described above. On the other hand, when an external force is applied to rotate the carriage means in the direction in which the carriage-side abutting portion is pressed against the carriage first stopper, the latch member is also pressed against the latch member stopper, and the carriage means and the latch member rebound. As a result, the carriage means and the latch member rotate in the same direction as when an external force is applied to rotate the carriage means so that the carriage-side abutting portion is away from the carriage first stopper, and the carriage means is latched.
  On the other hand, in the configuration in which the latch member is rotatable in both directions at the initial position and the slit holding portions provided in the carriage means are provided on both sides of the relief portion, the carriage means rotates in any direction. Even so, the latch claw enters the holding portion corresponding to the rotation direction among the holding portions, and the carriage means is latched.
[0028]
Further, by making the gravity center positions of the carriage means and the latch member coincide with the respective rotation centers, when an external force in the translation direction is applied to the carriage means and the latch member, the carriage means and the latch member do not rotate. Thereby, the unstable factor of the latch operation due to the unstable operation of the carriage means and the latch member is eliminated.
[0029]
  Furthermore, holding the slitPartThe contact surface is formed at an angle that rotates the latch member in a direction in which the latch claw moves away from the escape portion by the rotation of the carriage means.ApproachAs long as the force at the time is received, the state in which the latch claw is positioned in the holding portion is maintained, and the carriage means is more reliably latched.
[0030]
  In this case, in order to hold the latch claw in the holding part well, the end part farthest from the escape part of the holding part,ContactIt is continuous with the touch surface and the latch clawApproachPossibleHollowIs preferably formed. Also,ContactFacing the touch surfaceOppositeSurface, latch clawContactForming at an angle that pushes the latch claw so that the carriage means rotates in a direction opposite to the direction of contact with the touch surface to contact the latch claw and rotate the latch member in a direction to return to the initial position. Thus, the movement of the latch member to the initial position during the return operation of the latch member to the initial position and the return operation of the carriage mechanism to the retracted position is accelerated. In some cases, such as when the external force is large or when the external force is applied again during the latching operation, the carriage means may start to rotate again in the direction away from the retracted position. Therefore, the carriage mechanism is latched by the same operation as described above.
[0033]
  The latch member has a latch side abutting portion.In this case, the latch side abutting portion is configured to abut against the latch member stopper by line contact or point contact, so that the rebound speed of the latch member when the latch side abutting portion is pressed against the latch member stopper is increased. Become. Also, the latch member stopper can beDeformationWith this configuration, the latch-side abutting portion pressed against the latch member stopper is repelled by the reaction force of the latch member stopper, and the rebound speed of the latch member is further increased. Furthermore, the rotation speed of the latch claw when the latch member rotates by making the distance from the swing center of the latch member to the latch side abutting portion shorter than the distance from the swing center of the latch member to the latch claw. Becomes larger than the rotational speed of the latch-side abutting portion. In either case, move the latch claw at a high speed and move the latch claw to the holding part before it passes through the slit relief.ApproachAs a result, the reliability of the latch operation is improved.
[0034]
Further, when the carriage has a second stopper that contacts the carriage-side abutting portion at the other end of the swing range of the carriage means, the stopper is connected to a shaft member that pivotally supports the latch member. By using both of them, a latch member is the only part newly added for the carriage latch mechanism, and an increase in the number of parts can be minimized. For accurate operation of the latch member, the mounting position of the latch member, that is, the position of the shaft member (carriage second stopper) is important. The carriage second stopper defines the swing range of the carriage means. Therefore, it is attached with high positional accuracy. Therefore, by using the carriage second stopper also as the shaft member, it is possible to omit the shaft member that needs to be attached with high positional accuracy for attaching the latch member, and assembling becomes easy.
[0035]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0036]
(First embodiment)
FIG. 1 is a plan view showing the internal structure of the magnetic disk apparatus according to the first embodiment of the present invention. 2A and 2B are enlarged views showing the carriage mechanism and the latch mechanism of the magnetic disk apparatus shown in FIG. 1, wherein FIG. 2A is a plan view and FIG. 2B is a side view thereof.
[0037]
As shown in FIG. 1, this magnetic disk apparatus is roughly divided into two recording media 2 stacked with a space between each other, and a plurality of magnetic heads 9 that read / write data from / to the recording media 2. (See FIG. 2) and a latch mechanism for latching the magnetic head 9 on the ramp 4 when not in operation. These mechanisms include a base 1 manufactured by aluminum die-casting. It is accommodated in a housing constituted by a cover (not shown in FIG. 1 because the removed state is shown).
[0038]
The disc-shaped recording medium 2 is fixed to the spindle motor 3 fixed to the base 1 at a distance from each other via a clamp ring 17 and a spacer ring (not shown), and is fixed by driving the spindle motor 3. It is rotated at the number of rotations. In the present embodiment, the spindle motor 3 has a cantilever structure fixed to the base 1 as an example. However, the spindle motor 3 may have a both-end support structure that is fixed not only to the base 1 but also to the cover.
[0039]
The carriage mechanism 5 has a carriage arm 7 provided so as to be swingable (rotatable) about a pivot bearing 6 fixed to both the base 1 and the cover. As shown in FIG. 2, four suspensions 8 are attached to the tip of the carriage arm 7 at intervals in the thickness direction of the carriage arm 7, and two suspensions 8 face each other. A magnetic head 9 is attached so as to do this. Thereby, the read / write operation can be performed on both surfaces of the two recording media 2.
[0040]
A load bar 8 a is provided at the tip of the suspension 8. When the magnetic disk device does not perform a read / write operation, the load bar 8 a rides on the ramp 4 and completely retracts the magnetic head 9 from the recording medium 2. The lamp 4 has an inclined surface with a certain angle, and is fixed to the base 1. Therefore, the magnetic head 9 can be loaded and unloaded from the recording medium 2 at a constant speed.
[0041]
The magnetic head 9 is positioned with respect to the recording medium 2 by positioning the carriage arm 7 by a VCM (Voice Coil Motor) 10. The VCM 10 includes a magnetic circuit provided on the base 1 and a coil 11 provided on the carriage mechanism 5. The magnetic circuit is composed of a magnet 13 and a bottom yoke 14 fixed to the base 1 and a top yoke (not shown). In this embodiment, the coil 11 is held by a coil holder 12 made of resin and integrally formed with the carriage arm. The VCM 10 is generally used in this type of magnetic disk device, and since the detailed configuration and positioning method are well known, the description thereof is omitted here.
[0042]
The carriage mechanism 5 refers to the entire unit supported by the pivot bearing 6 including the coil 11 and the coil holder 12 in addition to the carriage arm 7, the suspension 8, and the magnetic head 9. The position of the center of gravity coincides with the center of the pivot bearing 6, that is, the center of rotation of the carriage mechanism 5.
[0043]
The coil holder 12 integrally formed with the carriage arm 7 has an inner peripheral stopper receiving surface 12 a that receives an inner peripheral stopper (shaft 15), which will be described later, and an outer peripheral stopper receiving surface that receives the outer peripheral stopper 16 at a part of the coil holder 12. It has the protrusion part which comprises 12b.
[0044]
A shaft 15 that functions as an inner peripheral stopper of the carriage mechanism 5 is erected on the base 1. The shaft 15 is provided at a position where the above-described inner peripheral stopper receiving surface 12 a contacts when the magnetic head 9 reaches the innermost periphery of the recording medium 2. As a result, the carriage arm 7 is prevented from further moving to the inner periphery, and the suspension 8 is prevented from being damaged by the collision with the clamp ring 17 or the spacer ring. The mounting position of the shaft 15 is important in defining the swing range of the carriage mechanism 5. The shaft 15 passes through the bottom yoke 14 of the VCM 10 and also has a function as positioning means for attaching the magnetic circuit of the VCM 10 to the base 1 with high positional accuracy. Therefore, the shaft 15 itself is attached to the base 1 with high positional accuracy.
[0045]
An outer peripheral stopper 16 is also attached to the base 1. However, when the magnetic head 9 is about to move further outward from the ramp 4 with respect to the recording medium 2, the outer peripheral stopper receiving surface 12 b is applied. It is provided at the position where it touches. As a result, the magnetic head 9 is prevented from falling off the ramp 4 and the suspension 8 is thereby prevented from being damaged. The outer peripheral stopper 16 incorporates a latch magnet (not shown), and a magnetic material such as SUS430 is attached to the outer peripheral stopper receiving surface 12b. Thus, when not operating, the carriage mechanism 5 is attracted to the outer peripheral stopper 16 by the magnetic force of the latch magnet, and the position of the carriage mechanism 5 is held at the retracted position unless an impact force exceeding this force is applied from the outside.
[0046]
Next, the latch mechanism of the present embodiment will be described in detail mainly with reference to FIG.
[0047]
The latch member 20 constituting the latch mechanism is disposed adjacent to the carriage mechanism 5 between the bottom yoke 14 and the carriage mechanism 5, and the same plane as the carriage mechanism 5 via the bush on the shaft 15 described above. It is supported so that it can swing (rotate) around the shaft 15. For example, a stainless steel bush is used to reduce the frictional resistance of the latch member 20. The position of the center of gravity of the latch member 20 coincides with the center of rotation, that is, the center position of the shaft 15.
[0048]
The latch member 20 includes an arm 20a and a counterweight portion 20b that extend from the shaft 15 to substantially opposite sides within the plane of rotation thereof. The length of the arm 20a is longer than the length of the counterweight portion 20b. A latch claw 21 that protrudes from the rotation surface of the latch member 20 and engages a slit 25 described later is integrally provided at the tip of the arm 20a. The latch claw 21 preferably protrudes in a direction substantially parallel to the axial direction of the shaft 15, in other words, in a direction substantially perpendicular to the rotation surface of the latch member 20.
[0049]
In the vicinity of the shaft 15, the latch member 20 is provided with a protruding portion 20 c having a magnetic body (not shown) such as SUS430 that receives an attractive force by the magnet 13 (see FIG. 1) of the VCM 10. Yes. As a result, the latch member 20 is always subjected to a force for holding the latch member 20 in the initial position, and the latch member 20 is positioned in the initial position unless an impact exceeding this force is applied from the outside. The latch member 20 is formed of resin, and the magnetic body and the above-described bush are integrally formed when the latch member 20 is formed by insert molding.
[0050]
The counterclockwise corner portion of the counterweight portion 20b that is the farthest from the shaft 15 is an abutting portion 22. At the initial position of the latch member 20, the abutting portion 22 is pressed against the latch stopper 23 provided on the base 1 in a line contact or point contact state by the magnetic force received by the convex portion 20c as shown in FIG. . The distance from the shaft 15 to the butting portion 22 is shorter than the distance from the shaft 15 to the latch claw 21.
[0051]
  As shown in FIG. 3, the latch stopper 23 isbottomIt is a portion that protrudes as a thin plate from the wall and is integrally formed with the base 1 and is configured to be easily elastically deformed by pressing the abutting portion 22. The latch stopper 23 is not particularly limited in shape and material as long as it can be elastically deformed in this way, and may be integrally formed of aluminum as a part of the base 1. For example, a material having low rigidity such as resin may be used for the base 1. It may be configured to be fixed.
[0052]
  On the other hand, the latch claw 21 of the latch member 20 is provided on the coil holder 12 constituting the carriage mechanism 5.ApproachA slit 25 is formed. The slit 25 will be described with reference to FIG.
[0053]
The slit 25 reaches the end face of the coil holder 12, and when the latch member 20 is in the initial position, the slit 25 does not interfere with the latch claw 21 and does not interfere with the operation of the carriage mechanism 5 on the recording medium 2 (see FIG. 1). A latch claw holding portion 25e that is bent from the relief portion 25a with respect to the moving direction of the relief portion 25a relative to the latch claw 21 during operation of the carriage mechanism 5 and extends away from the rotation center of the carriage mechanism 5. Have The relief portion 25a is preferably formed in an arc shape centering on a pivot bearing 6 (see FIG. 2), which is the rotation center of the carriage mechanism 5. The latch claw holding portion 25e has a contact surface 25b that comes into contact with the latch claw 21 to prevent rotation of the carriage mechanism 5 when an impact is applied from the outside and the latch member 20 rotates clockwise, and a surface that faces the contact surface 25b. And an opposing surface 25d.
[0054]
The contact surface 25b is formed at an angle that, when coming into contact with the latch claw 21, rotates the latch member 20 in a direction in which the latch claw 21 moves away from the escape portion 25a. The end of the latch claw holding portion 25e farthest from the escape portion 25a is formed with a recess 25c large enough to accommodate the latch claw 21. The opposing surface 25d is formed at such an angle that the latch claw 21 released from the recess 25c comes into contact with it and further returns to the initial position.
[0055]
Next, the operation of the latch mechanism will be described.
[0056]
  First, at the initial position where no external impact is applied, as shown in FIG. 5, the magnetic body provided at the tip of the convex portion 20c is attracted by the magnetic force of the VCM 10 (see FIG. 1), and the abutting portion 22 is latched. Stopper23It is pressed against. In this state, the latch claw 21 does not interfere with the slit 25 of the carriage mechanism 5, and the latch claw 21 passes through the escape portion 25a even if the carriage mechanism 5 rotates counterclockwise. In operation, loading and unloading of the magnetic head 9 (see FIG. 2) to the recording medium 2 (see FIG. 1) can be performed. When the carriage mechanism 5 is not operating, as shown in FIG. 1, the carriage mechanism 5 has the outer peripheral stopper receiving surface 12b attracted to the outer peripheral stopper 16 by magnetic force, and the load bar 8a rides on the ramp 4. In the retracted position.
[0057]
When a translational impact is applied to the magnetic disk device, the carriage mechanism 5 and the latch member 20 both do not rotate because the center of gravity of the carriage mechanism 5 and the latch member 20 coincide with the center of rotation thereof. Accordingly, the latch member 20 is held at the initial position and the carriage mechanism 5 is held at the retracted position, and the carriage mechanism 5 and the latch member 20 operate only when an impact is applied to rotate the carriage mechanism 5. To do. As a result, factors that cause unstable operation of the carriage mechanism 5 and the latch member 20 are eliminated, and stable operation of the carriage mechanism 5 and the latch member 20 as will be described later when an impact is applied to the magnetic disk device. Is possible.
[0058]
On the other hand, when an impact acceleration larger than the magnetic attractive force of the carriage mechanism 5 and the latch member 20 is applied to the magnetic disk device to rotate the carriage mechanism 5 counterclockwise, as shown in FIG. Both the mechanism 5 and the latch member 20 rotate counterclockwise. As a result, the latch claw 21 moves from the escape portion 25a to the latch claw holding portion 25e and contacts the contact surface 25b of the slit 25. Since the latch claw holding portion 25e is bent and extends with respect to the relief portion 25a, the latch claw 21 is latched to the latch claw holding portion 25e as long as the carriage mechanism 5 and the latch member 20 receive counterclockwise rotational force. The rotation of the carriage mechanism 5 is suppressed.
[0059]
At this time, the distance from the rotation center of the latch member 20 to the latch claw 21, the distance from the rotation center of the carriage mechanism 5 to the slit 25, and the latch claw 21 and the slit 25 when the latch member 20 is in the initial position. If the gap is set appropriately, the movement speed of the latch claw 21 can be increased with respect to the movement speed of the portion of the carriage mechanism 5 where the slit 25 is formed, and the carriage mechanism 5 is more reliably locked. It becomes possible. Further, in order to appropriately set the positional relationship between the latch claw 21 and the slit 25, the attachment position of the latch member 20, that is, the position of the shaft 15 is also important. However, as described above, since the shaft 15 also serves as a positioning pin for the VCM 10, it is not necessary to install the shaft 15 with high positional accuracy only for the latch member 20, and the man-hour for mounting the shaft 15 increases accordingly. Nor.
[0060]
Here, the contact surface 25b of the slit 25 is formed so as to be inclined counterclockwise with respect to a straight line passing through the rotation center of the latch member 20 and the latch claw 21, and thus contact the latch claw 21. The latch member 20 receives a counterclockwise force due to the inertial force of the carriage mechanism 5. By the rotation operation of the latch member 20, the latch claw 21 enters the recess 25c as shown in FIG. In this state, as long as the carriage mechanism 5 receives a counterclockwise external force, the latch claw 21 does not come out of the recess 25 c and the carriage mechanism 5 is latched by the latch member 20. As a result, the rotation of the carriage mechanism 5 and the latch member 20 in the counterclockwise direction, that is, the movement of the magnetic head 9 (see FIG. 2) to the recording medium 2 (see FIG. 1) is prevented.
[0061]
After that, when the impact acceleration for rotating the carriage mechanism 5 counterclockwise is eliminated or reduced, the reaction force when the latch claw 21 enters the recess 25c or the outer peripheral stopper 16 (see FIG. 1) is built. The carriage mechanism 5 starts to rotate clockwise by the force to return the carriage mechanism 5 by the latch magnet to the retracted position. As a result, as shown in FIG. 8, the latch claw 21 comes off the recess 25c, and the latch claw 21 comes into contact with the opposing surface 25d as the carriage mechanism 5 rotates clockwise.
[0062]
When the latch claw 21 is disengaged from the recess 25c, the latch member 20 is moved to the initial position by the magnetic force acting between the magnetic body provided on the convex portion 20c (see FIG. 2) of the latch member 20 and the magnet 13 (see FIG. 1). Starts rotating clockwise to go back. On the other hand, the facing surface 25d is formed so as to be inclined counterclockwise with respect to a straight line passing through the rotation center of the latch member 20 and the latch claw 21 and to come into contact with the latch claw 21. Therefore, when the carriage mechanism 5 rotates clockwise while the latch claw 21 is in contact, the latch claw 21 is pushed by the facing surface 25d, and the clockwise rotation of the latch member 20, that is, movement to the initial position is accelerated. Is done. Therefore, when the carriage mechanism 5 returns to the retracted position, the latch member 20 has already been returned to the initial position.
[0063]
When the impact force applied to the magnetic disk device is large or when an impact is applied again during the latching operation, the carriage mechanism 5 rebounds and starts rotating in the direction away from the retracted position. Is already at the initial position, the series of operations described above are repeated at substantially the same timing. As a result, the carriage mechanism 5 can be reliably locked against rebound of the carriage mechanism 5.
[0064]
Finally, the carriage mechanism 5 and the latch member 20 are each returned to the retracted position and the initial position by the attractive force acting between the magnetic body and the magnet, and are in the state shown in FIG.
[0065]
In the foregoing, the operation of the carriage mechanism 5 and the latch member 20 in the case where an impact acceleration for rotating the carriage mechanism 5 in the counterclockwise direction is applied to the magnetic disk device has been described. The operation in the case where an impact acceleration is applied to rotate the lens clockwise will be described below.
[0066]
In the state shown in FIG. 1, the carriage mechanism 5 is in the retracted position, and the outer peripheral stopper receiver 12 b is in contact with the outer peripheral stopper 16. Therefore, when an impact acceleration is applied to rotate the carriage mechanism 5 in the clockwise direction, the outer peripheral stopper receiver 12b is strongly pressed against the outer peripheral stopper 16, and the reaction causes the carriage mechanism 5 to start rotating counterclockwise.
[0067]
On the other hand, the latch member 20 is in the initial position, and the abutting portion 22 is in contact with the latch stopper 23. Accordingly, the latch member 20 also tries to rotate clockwise due to the impact acceleration that tries to rotate the carriage mechanism 5 clockwise, whereby the abutting portion 22 is strongly pressed against the latch stopper 23 and the latch stopper 23 is elastically deformed. The latch member 20 also starts to rotate counterclockwise by the restoring force. At this time, the contact between the abutting portion 22 and the latch stopper 23 is a line contact or a point contact, and the contact area between the two is small. Therefore, the coefficient of restitution of the abutting portion 22 when the abutting portion 22 is pressed against the latch stopper 23 is increased, and the rotational speed of the latch member 20 in the counterclockwise direction is increased.
[0068]
Further, since the distance from the rotation center of the latch member 20 to the latch claw 21 is larger than the distance from the rotation center of the latch member 20 to the abutting portion 22, the latch claw 21 has a larger rotation speed than the abutting portion 22. Move with.
[0069]
Therefore, before the escape portion 25a of the slit 25 passes through the latch claw 21, the latch member 20 can be rotated counterclockwise to obtain the state shown in FIG. Thereafter, the carriage mechanism 5 and the latch member 20 operate in the same manner as when an impact acceleration is applied to rotate the carriage mechanism 5 counterclockwise. As a result, the carriage mechanism 5 can be reliably latched. it can.
[0070]
Here, due to the relationship between the moment of inertia of the carriage mechanism 5 and the rigidity of the outer peripheral stopper 16, there is a frequency band in which the carriage mechanism 5 is likely to repel. When an impact having a component close to the frequency band is received, the carriage mechanism 5 may start rotating due to a reaction even if the acceleration is weak. In order to prevent such rotation of the carriage mechanism 5, the ratio of the inertia moment of the latch member 20 and the rigidity of the latch stopper 23 is substantially the same as the ratio of the inertia moment of the carriage mechanism 5 and the rigidity of the outer peripheral stopper 16. It is desirable to define the rigidity of the latch stopper 23 so that It is possible to make the ratio of the moment of inertia of the latch member 20 and the rigidity of the latch stopper 23 substantially the same as the ratio of the moment of inertia of the carriage mechanism 5 and the rigidity of the outer peripheral stopper 16 by changing other structural portions. However, since the latch stopper 23 has the simplest shape, it is easiest to define the rigidity of the latch stopper 23. By defining the rigidity of the latch stopper 23 in this manner, the rotational speed of the latch member 20 can be made larger than the rotational speed at which the carriage mechanism 5 rebounds for any frequency band impact.
[0071]
As described above, according to this embodiment, the latch member 20 is provided with the latch claw 21 and the slit 25 is formed in the coil holder 12 which is a member constituting the carriage mechanism 5. When an impact is applied to the apparatus, the carriage mechanism 5 can be latched to prevent the magnetic head 9 from falling off the ramp 4. Since the latch member 20 is simply provided with the latch pawl 21, the structure of the latch member 20 itself is simple, and the carriage mechanism 5 can be latched by one latch member 20 against bidirectional rotational force. Therefore, there is almost no enlargement of the whole apparatus by adding the latch member 20. On the other hand, since the slit 25 is formed in the resin-made coil holder 12 constituting a part of the carriage mechanism 5, it can be easily formed simultaneously with the molding of the coil holder 12.
[0072]
In particular, when an impact acceleration is applied to rotate the carriage mechanism 5 clockwise, the latch member 20 is rotated counterclockwise by the repulsive force acting on the abutting portion 22 to latch the carriage mechanism 5. However, when the latch member 20 is rotated counterclockwise, the restoring force of the latch stopper 23 can be utilized by providing the latch stopper 23 that is elastically deformed by the pressing of the abutting portion 22 as described above. . As a result, the counterclockwise rotation speed of the latch member 20 can be increased, and the carriage mechanism 5 can be latched more reliably.
[0073]
In this embodiment, the abutting structure of the latch member 20 has been described by taking the thin plate-like latch stopper 23 formed as a part of the base 1 as an example, but other examples are illustrated in FIGS. 9 and 10. The description will be given with reference.
[0074]
In the example shown in FIG. 9, a latch receiving member 62 formed of a material having elasticity such as rubber is attached to a portion of the inner wall of the base 61 that contacts the latch member 20. The latch member 20 is the same as that shown in FIG. 1 and the like, and the abutting portion 22 is bitten into the latch receiving member 62 and pressed against the latch receiving member 62 in a line contact state. In the example shown in FIG. 10, an abutting member 73 made of a material having elasticity such as rubber is attached to a portion of the latch member 72 that contacts the base 71, while the abutting member 73 is affixed to the inner wall of the base 71. The protrusion 71a with which the member 73 abuts is provided integrally. In this way, either the latch member side or the base side can be formed of an elastic member, and the repulsive force applied to the latch member can be increased.
[0075]
(Second Embodiment)
FIG. 11 is a plan view of a carriage mechanism and a latch mechanism of a magnetic disk device according to the second embodiment of the present invention. FIG. 11 shows a state in which the latch member 50 is in the initial position and the carriage mechanism 35 is in the retracted position.
[0076]
  In this embodiment, the latch member 50 does not have an abutting portion as in the first embodiment, and the latch member 50 is not in contact with a base (not shown). Accordingly, the latch member 50 can rotate in both the clockwise and counterclockwise directions at the initial position. However, the latch member 50 has a magnetic body (not shown) provided on the convex portion 50c and V.CMIs received by the magnetic force acting between them, and is normally held at the initial position.
[0077]
  The coil holder 42 of the carriage mechanism 35 has a latch claw 51 of the latch member 50 for latching the carriage mechanism 35.ApproachA slit 55 is formed. The slit 55 includes an escape portion 55a similar to that of the first embodiment, and two latch claw holding portions 55e and 55e 'branched from both sides of the escape portion 55a. The latch claw holding portions 55e and 55e 'are arranged symmetrically with respect to the escape portion 55a, and act on the latch claw 51 in the same manner as in the first embodiment. Recesses 55c and 55c 'are formed at the tips of the latch claw holding portions 55e and 55e'.
[0078]
In other configurations, for example, the gravity center position of the latch member 50 matches the rotation center of the latch member 50, the gravity center position of the carriage mechanism 35 matches the rotation center of the carriage mechanism 35, and the carriage. Since the mechanism 35 is in the state in which the outer peripheral stopper receiving surface 42b is in contact with the outer peripheral stopper (not shown) in the retracted position, the detailed description thereof is omitted.
[0079]
According to the above configuration, the latch claw 51 is located at the relief portion 55 a of the slit 55 at the initial position where no impact is applied from the outside. Therefore, the carriage mechanism 35 can freely rotate counterclockwise, and is in a state where a normal operation as a magnetic disk device can be performed.
[0080]
When an impact acceleration for rotating the carriage mechanism 35 counterclockwise is applied to the magnetic disk device, the carriage mechanism 35 starts rotating counterclockwise and the latch member 50 also starts rotating counterclockwise. . Thereby, the latch claw 51 enters the latch claw holding portion 55e farther from the rotation center of the carriage mechanism 35 among the two latch claw holding portions 55e and 55e '. Thereafter, the carriage mechanism 35 is latched by the latch member 50 through a series of operations similar to those described in the first embodiment. Finally, the latch member 50 is moved to the initial position, and the carriage mechanism 35 is moved to the retracted position. To return to each.
[0081]
On the other hand, when an impact acceleration is applied to rotate the carriage mechanism 35 clockwise, the outer peripheral stopper receiving surface 42b is pressed against the outer peripheral stopper, and the carriage mechanism 35 starts to rotate counterclockwise by the reaction. At the same time, the latch member 50 starts to rotate clockwise, whereby the latch claw 51 has a latch claw holding portion 55e ′ closer to the rotation center of the carriage mechanism 35 of the two latch claw holding portions 55e and 55e ′. to go into. Since this latch claw holding portion 55e 'has a symmetrical shape with the other latch claw holding portion 55e, the carriage mechanism is operated in the same series of operations as when the latch claw 51 enters the latch claw holding portion 55e. 35 is latched by the latch member 50. Finally, the latch member 50 returns to the initial position, and the carriage mechanism 35 returns to the retracted position.
[0082]
As described above, the carriage mechanism 35 can be latched regardless of any impact acceleration that rotates the carriage mechanism 35, and the carriage mechanism 35 and the latch member 50 return to the initial state when the impact acceleration is lost. Thus, the carriage mechanism 35 can be freely rotated.
[0083]
When a translational impact is applied to the magnetic disk device, both the carriage mechanism 35 and the latch member 50 have their center of gravity coincident with their rotational center, so that the latch is the same as in the first embodiment. The member 50 is held at the initial position, and the carriage mechanism 35 is held at the retracted position.
[0084]
【The invention's effect】
As described above, according to the present invention, the latch member is provided with the latch claw, and the carriage means is provided with a slit that engages with the latch claw. Even in this case, the carriage means can be latched.
[0085]
In addition, by aligning the center of gravity of the carriage means and the latch member with the respective rotation centers, the unstable operation factor of the carriage means and the latch member when a translational impact is applied is eliminated, and a more stable latch operation is achieved. Can be realized.
[0086]
  Furthermore, holding the slitPartBy forming the contact surface at an angle that rotates the latch member in a direction in which the latch claw moves away from the escape portion by the rotation of the carriage unit, the carriage unit can be latched more reliably.
[0087]
Further, when the carriage means and the latch member are configured to abut and be held at one end of each swing range, the abutment portion of the latch member is configured to abut against the stopper by line contact or point contact. The latch member stopper is configured to be elastically deformable by abutment of the latch member, or the distance from the rocking center of the latch member to the abutting portion is made shorter than the distance from the rocking center of the latch member to the latch pawl. Thus, the latch claw can be moved quickly. Further, when the carriage has a second stopper that contacts the carriage-side abutting portion at the other end of the swinging range of the carriage means, the stopper is also used as a shaft member that pivotally supports the latch member, thereby increasing the number of parts. Can be minimized, and the mounting position accuracy of the parts can be eased and the assembly can be easily performed.
[Brief description of the drawings]
FIG. 1 is a plan view showing an internal structure of a magnetic disk device according to a first embodiment of the present invention.
2 is an enlarged view showing a carriage mechanism and a latch mechanism of the magnetic disk apparatus shown in FIG. 1, wherein FIG. 2 (a) is a plan view thereof and FIG. 2 (b) is a side view thereof.
3 is a view showing a cross section of a base at a portion where a latch stopper is provided in the magnetic disk device shown in FIG. 1;
4 is a plan view showing a further enlarged portion of a slit portion of the carriage mechanism and the latch mechanism shown in FIG. 2. FIG.
5 is a diagram for explaining the operation of the latch mechanism shown in FIG. 2, showing a state in which the latch member is in the initial position and the carriage mechanism is in the retracted position.
6 is a diagram for explaining the operation of the latch mechanism shown in FIG. 2, and shows a state in which the latch member and the carriage mechanism are rotated counterclockwise from the state shown in FIG.
7 is a diagram for explaining the operation of the latch mechanism shown in FIG. 2, in which the latch member and the carriage mechanism are further rotated from the state shown in FIG. 6, and the latch claw is in the recess.
8 is a diagram for explaining the operation of the latch mechanism shown in FIG. 2, and shows a state in which the latch member and the carriage mechanism are rotated clockwise after the state shown in FIG.
FIG. 9 is a cross-sectional view of a main part showing another example of a latch member butting structure.
FIG. 10 is a plan view of a principal part showing still another example of a latch member abutting structure.
FIG. 11 is a plan view of a carriage mechanism and a latch mechanism of a magnetic disk device according to a second embodiment of the present invention.
FIG. 12 is a diagram for explaining an example of a latch mechanism of a carriage by an inertia latch system of a conventional magnetic disk device.
FIG. 13 is a diagram for explaining another example of a latch mechanism of a carriage by an inertia latch system of a conventional magnetic disk device.
FIG. 14 is a diagram for explaining still another example of a latch mechanism of a carriage using an inertia latch system of a conventional magnetic disk device.
[Explanation of symbols]
1,61,71 base
2 recording media
3 Spindle motor
4 lamps
5,35 Carriage mechanism
6 Pivot bearing
7 Carriage arm
8 Suspension
9 Magnetic head
10 VCM
11 Coil
12, 42 Coil holder
13 Magnet
14 Bottom yoke
15 shaft
16 Perimeter stopper
20, 50, 72 Latch member
20a arm
20b Counterweight part
20c, 50c Convex part
21, 51 Latch claw
22 Butting part
23 Latch stopper
25, 55 slit
25a, 55a Escape part
25e, 55e, 55e 'latch claw holder
25c, 55c, 55c 'hollow
62 Latch receiving member
71a protrusion
73 Butting member

Claims (14)

An external force is applied to the carriage means that supports the magnetic head and is pivotally supported within a range including the retracted position and abuts against the carriage first stopper to hold one end of the swing range as the retracted position. In a carriage latch mechanism that holds it so as not to drop out of the retracted position when added,
A single latch member provided with a latch claw that is pivotally supported in the same plane as the carriage means and protrudes with respect to the plane;
The carriage means is formed with a slit in which the latch pawl is located when the carriage means is in the retracted position.
The slit allows the free oscillation of said carriage means in said range without interfering with the latch pawl when in the initial position the latch member is a position in a state where no plus a pre Kigairyoku , the center and the circular arc shape which is formed in the relief portion of the rotation center of said carriage means, extending bent from the relief portion, the latch claws and those by the carriage means and said latch member by the external force to rotate contact look including a holding portion having a contact surface and the opposing surface facing the said contact surface to prevent rotation of said carriage means,
The latch member is a latch member for holding, as the initial position, one end on the rotation direction side that is the same as the rotation direction of the carriage means when the carriage means is abutted against the carriage first stopper in the swing range. a carriage latch mechanism characterized that you have the abutted against latch-side abutting portion to the stopper. An external force is applied to the carriage means that supports the magnetic head and is pivotally supported within a range including the retracted position and abuts against the carriage first stopper to hold one end of the swing range as the retracted position. In a carriage latch mechanism that holds it so as not to drop out of the retracted position when added,
A single latch member provided with a latch claw that is pivotally supported in the same plane as the carriage means and protrudes with respect to the plane;
The carriage means is formed with a slit in which the latch pawl is located when the carriage means is in the retracted position,
The slit allows the carriage means to freely swing within the range without interfering with the latch pawl when the latch member is in an initial position which is a position in a state where the external force is not applied. An escape portion formed in an arc shape with the rotation center of the carriage means as a center, and a bent portion extending from the escape portion, and the carriage means and the latch member are rotated by the external force to contact the latch claw. A holding surface having a contact surface for preventing rotation of the carriage means and an opposing surface facing the contact surface,
The latch member is rotatable in both directions at the initial position, and the holding portion is provided on both sides of the escape portion so as to be symmetrical to the escape portion. The carriage latch mechanism according to claim 1 or 2 , wherein the carriage means and the latch member have the same center of gravity and the center of oscillation. The contact surface of the holding portion by the rotation of said carriage means, said latch pawl is formed at an angle to rotate the latch member in a direction to move away from the relief portion, one of the claims 1 to 3 the carriage latch mechanism according to any one of claims. Wherein the farthest end from the relief portion of the holding portion, before continuous with Kise' Sawamen, and the latch pawl recess which can enter is formed, the carriage latch mechanism of claim 4. The facing surface of the holding portion, the contact with the latch claw by the carriage means is rotated in a direction opposite to the direction when the latch claw is in contact with the front Kise' Sawamen and the said latch member The carriage latch mechanism according to claim 4 or 5 , wherein the carriage latch mechanism is formed at an angle to push the latch pawl so as to rotate in a direction to return to the initial position. The carriage latch mechanism according to claim 1 , wherein the latch side abutting portion is abutted against the latch member stopper by line contact or point contact. The carriage latch mechanism according to claim 1 or 7 , wherein the latch member stopper is configured to be elastically deformable by abutting the latch side abutting portion. The carriage latch mechanism according to claim 8 , wherein the latch member stopper is made of an elastic member. The carriage according to claim 1, 7, 8, or 9 , wherein a distance from the swing center of the latch member to the latch side abutting portion is shorter than a distance from the swing center of the latch member to the latch pawl. Latch mechanism. A carriage second stopper that contacts the carriage-side abutting portion at the other end of the swinging range of the carriage means, and a shaft member that pivotally supports the latch member also serves as the carriage second stopper; The carriage latch mechanism according to any one of claims 1 to 10 . The carriage latch mechanism according to claim 11 , wherein the shaft member is positioned with reference to a base portion of an apparatus on which the carriage means and the latch member are mounted. A disk-shaped recording medium provided to be rotatable,
A magnetic head is supported and within a range including a retraction position where the magnetic head is retreated from the recording medium and a position where the magnetic head is on the recording medium within the same plane as the rotation surface of the recording medium. A carriage means pivotally supported by the shaft;
Driving means for driving the carriage means to position the carriage means at a predetermined position on the recording medium;
Magnetic disk device having a carriage latch mechanism according to any one of claims 1 to 12. 14. The magnetic disk according to claim 13 , wherein the driving means is a voice coil motor, and a coil constituting the voice coil motor is integrally formed with the carriage means with resin, and the slit is formed in the resin portion. apparatus.

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