JP2007052880A - Inertia latch mechanism, magnetic disk drive and electronic equipment - Google Patents

Abstract

To reduce the size of a magnetic disk device while reliably latching a carriage against an impact force, and when an impact force is not applied, an inertia lever is reliably positioned at a neutral position to prevent unnecessary latching. Can be realized easily.
A base end portion 43 of a carriage 4 is provided with a first concave portion 43a and a second concave portion 43b, and a latch arm 71 has a first concave portion 43a at both ends sandwiching a rotating shaft 72. And a second claw portion 71b engageable with the second recess 43b. Further, a torsion coil spring is provided for biasing the rotation of the latch arm 71 from both sides with the back surface of the yoke 51 as a support shaft. When an impact or vibration is applied to the HDD, the latch arm 71 latches the carriage 4 corresponding to the inertia in both rotational directions, and when no impact or vibration is applied, the latch arm is driven by the biasing force of the torsion coil spring. 71 is kept in the neutral position.
[Selection] Figure 2

Description

  The present invention relates to an inertia latch mechanism used in a magnetic disk device such as an HDD (hard disk drive), a magnetic disk device having the latch mechanism, and an electronic apparatus having the magnetic disk device.

  2. Description of the Related Art Recently, in a magnetic disk device such as an HDD, a ramp / load system is employed in which a head is retracted to a lamp outside the disk when the disk is not rotating. In this ramp-load system, when an impact or vibration is applied from the outside, the carriage that supports the head rotates and the head drops from the lamp onto the disk, causing an adsorption phenomenon between the head and the disk. Usually, a latch mechanism for locking the carriage is provided to prevent this. The latch mechanism includes a magnet latch mechanism using a magnetic force and an inertia latch mechanism using an inertial force.

  Among them, the inertia latch mechanism includes a two-latch mechanism composed of two levers, an inertia lever that rotates by inertial force, and a lock lever that rotates in conjunction with the rotation of the inertia lever and locks the carriage; There is a one-latch mechanism composed of a single lever that combines the inertia lever mechanism and the lock lever mechanism.

  Of these, the two latch mechanism can be latched in response to rotational impacts in both the clockwise and counterclockwise directions depending on the direction in which the inertia is applied, but the cost is high due to the large number of parts, and In particular, there is a problem that sufficient space cannot be taken even if it is adopted in a miniaturized HDD.

  On the other hand, the single latch mechanism is advantageous in terms of cost and space for downsizing, but normally the lever standby position is determined by using the force of the magnet when inertia is not applied. One end of the lever is pressed against the magnet with respect to the rotation axis. Then, only one direction can be dealt with with respect to the direction in which the inertia is applied, and it was impossible to deal with the rotational impact in both directions like the two levers.

In view of this, an inertia latch mechanism has been devised in which latching claws are provided at both ends across the rotation shaft of the lever, and latching can be performed with one lever while corresponding to the inertia in both rotation directions (see, for example, Patent Document 1). ).
JP 2001-14815 (paragraphs [0034], [0035], FIG. 4 etc.)

  By the way, when trying to cope with inertia in both directions with a single lever, the lever should be in a neutral position so that it will not affect the load operation by unnecessarily rotating and latching when there is no impact. It is necessary to make it stand by after positioning. However, in the technique described in Patent Document 1, the positioning is determined by a magnetic body provided on the lever and a magnet provided on the opposite side of the lever from the carriage adjacent to the lever. Therefore, a space for providing the magnet is required, which becomes an obstacle when trying to downsize the HDD. In view of the recent miniaturization of HDDs, this obstacle is serious.

  In view of the circumstances as described above, the object of the present invention is to latch the carriage with respect to the impact force, and to reliably position the inertia lever at the neutral position when the impact force is not applied. It is an object of the present invention to provide an inertia latch mechanism of a magnetic disk device, a magnetic disk device having the inertia latch mechanism, and an electronic apparatus having the magnetic disk device that can be easily reduced in size.

  In order to solve the above-described problems, an inertia latch mechanism of the present invention is an inertia latch mechanism used in a magnetic disk device, having a magnetic head at one end and first and second recesses at the other end. The carriage is movable between the magnetic disk and the ramp about a rotation axis that is substantially perpendicular to the recording surface of the magnetic disk, and engageable with the first recess. A first claw portion, a second claw portion engageable with the second recess, and a rotation shaft of the carriage so as to be sandwiched between the first claw portion and the second claw portion. A rotation shaft provided substantially parallel to the magnetic disk device, and when a predetermined external force is applied to the magnetic disk device, the rotation shaft is provided to be rotatable in a clockwise direction and a counterclockwise direction around the rotation shaft. The predetermined external force is applied to the latch arm and the magnetic disk device. If no, comprising a biasing means for biasing the latch arm in a direction to restrict rotation of the latch arms.

  Here, the magnetic disk device is, for example, an HDD. The urging means is an elastic body such as a spring or rubber. Various springs such as coil springs and leaf springs can be used. The predetermined external force is a translational impact, a rotational impact, a vibration, etc., and is a force larger than a force obtained by adding at least the urging force by the urging means and the frictional force between the latch arm and its rotating shaft. . That is, when the predetermined external force is applied, the latch arm rotates against the biasing force and the frictional force.

  With this configuration, when the magnetic head is retracted from the ramp, either a clockwise direction or a counterclockwise direction is applied to the latch arm by applying a predetermined external force such as shock or vibration to the magnetic disk device. Even when the inertia in the direction is applied, the first claw portion engages with the first concave portion of the carriage by the rotation of the latch arm in both directions, or the second claw portion is the second claw portion. The magnetic head can be prevented from jumping out from the lamp to the magnetic disk side by engaging with the concave portion. In addition, when the predetermined external force is not applied, the latch arm is corrected to a predetermined neutral position by the biasing means, so that the latch arm rotates to latch the magnetic head until the latch is not necessary. Thus, it is possible to prevent the loading and unloading from becoming impossible. That is, since the neutral correction can be surely performed by the urging means, the inertia latch mechanism can be realized also by a so-called single latch structure latch arm. As a result, space can be saved while reducing the number of parts compared to a latch arm having a two-latch structure, and the reliability of the magnetic disk drive can be improved by simplifying the structure. it can.

  If the biasing force of the biasing means is too strong, there is a possibility that the latch arm rotation start timing will be delayed at the time of impact or vibration, and latching may fail, and if it is too weak, the neutral correction may not be possible. Therefore, the force is adjusted to a range where such a situation does not occur.

  According to an embodiment of the present invention, the inertia latch mechanism further includes a cover member that covers a part of the latch arm and the carriage, and the biasing means rotates the latch arm in a clockwise direction. And a torsion coil spring that is urged so as to be regulated in a counterclockwise direction, and a support member that is provided on the back surface of the cover member and supports the torsion coil spring. By adopting the torsion coil spring as the urging means, it is possible to reliably realize the neutral correction even though the cost is low and the structure is relatively simple. Further, by providing the support member of the torsion coil spring on the latch arm and the cover member of the carriage, the space can be used more effectively than when the support member is provided independently.

  According to an aspect of the present invention, in the inertia latch mechanism, the torsion coil spring includes first and second arm portions, and the latch arm has a predetermined distance from a rotation shaft of the latch arm. Provided in contact with the first arm portion to receive the urging force in the clockwise direction and the urging force in the counterclockwise direction by contacting the first projecting portion and the second arm portion. There may be provided a second protrusion for receiving. For example, when the diameter of the magnetic disk is 1 inch, the predetermined distance refers to a distance of, for example, about 2 mm or more from the center of the rotating shaft toward the longitudinal direction of the latch arm. Since the arm portion of the torsion coil spring supports the latch arm with the projecting portion having the predetermined distance as a fulcrum, the neutral position is corrected more stably when the predetermined external force is not applied to the magnetic disk device. Is possible.

  According to an aspect of the present invention, in the inertia latch mechanism, the latch arm may be formed such that the thickness at both ends is thicker than the thickness near the rotation shaft. As a result, both ends of the latch arm away from the pivot axis become heavier, so that the inertia when the predetermined external force is applied to the magnetic disk device and the inertia is applied as compared with the case where the wall thickness is constant. The moment, that is, the torque is increased, and the latch arm is stably rotated by the inertia, so that the latch operation can be reliably performed.

  According to an aspect of the present invention, in the inertia latch mechanism, the latch arm may be formed of a resin containing tungsten. The latch arm having a larger specific gravity is preferable because the torque increases. Therefore, for example, an alloy having a large specific gravity such as brass may be used. However, by using a resin containing tungsten, a sufficient specific gravity can be provided at a low cost compared to an alloy such as brass. The torque can be reliably obtained.

  According to an aspect of the present invention, in the inertia latch mechanism, a tab is provided at a tip of the magnetic head, and the ramp includes a slope on which the tab rides when the magnetic head is unloaded, And a step portion that is formed in the unloading direction and on which the tab is placed when the magnetic disk is not rotated.

  Here, the unload direction refers to the direction in which the magnetic head moves away from the magnetic disk. Further, the stepped portion may be formed at a substantially right angle, or may be formed as a chamfered shape, an R-shaped slope or the like. With this configuration, even when the predetermined external force is applied to the magnetic disk device and the tab (head) moves to the magnetic disk side, the movement is restricted by the stepped portion. Even if it is delayed from the start of the rotation, the movement of the head can be restricted or delayed to assist the latch operation by the rotation of the latch lever.

  According to an aspect of the present invention, in the inertia latch mechanism, the latch arm includes a protrusion provided in the direction of the carriage from the vicinity of the rotation shaft and a magnetic element provided at a tip of the protrusion. The carriage may form a part of a voice coil motor and have a magnet capable of attracting the magnetic body at the other end. As a result, when the predetermined external force is not applied, the neutral correction operation of the latch arm by the biasing means can be assisted by the attractive force of the magnet, and the predetermined external force is applied. Thus, even if the start of rotation of the latch arm is delayed, the turning force of the carriage can be weakened by the attractive force of the magnet, and the failure of the latch operation can be prevented.

  A magnetic disk apparatus according to another aspect of the present invention is a magnetic disk apparatus having an inertia latch mechanism, and has a magnetic disk, a spindle motor for supporting and rotating the magnetic disk, and a magnetic head at one end. And the first and second recesses at the other end, and the head is moved between the magnetic disk and the ramp by rotating about a rotation axis substantially perpendicular to the recording surface of the magnetic disk. Carriage, a voice coil motor for rotating the carriage, a first claw portion engageable with the first recess, and a second claw portion engageable with the second recess And a rotation shaft provided substantially parallel to the rotation shaft of the carriage so as to be sandwiched between the first claw portion and the second claw portion, and a predetermined external force applied to the magnetic disk device. Centered on the rotation axis A latch arm provided to be rotatable in a clockwise direction and a counterclockwise direction, and a direction for restricting the rotation of the latch arm when the predetermined external force is not applied to the magnetic disk device. And urging means for urging the power.

  An electronic apparatus according to still another aspect of the present invention is an electronic apparatus having a magnetic disk device, and includes a magnetic disk, a spindle motor for supporting and rotating the magnetic disk, and a magnetic head at one end. The first and second recesses are provided at the other end, and the head can be moved between the magnetic disk and the lamp by rotating about a rotation axis substantially perpendicular to the recording surface of the magnetic disk. A carriage, a voice coil motor for rotating the carriage, a first claw portion engageable with the first recess, and a second claw portion engageable with the second recess. And a rotation shaft provided substantially parallel to the rotation shaft of the carriage so as to be sandwiched between the first claw portion and the second claw portion, and a predetermined external force is applied to the magnetic disk device. When it is added, it rotates clockwise around the rotation axis. When the predetermined external force is not applied to the latch arm that is provided so as to be rotatable in the counterclockwise direction, the latch arm is biased in a direction that restricts the rotation of the latch arm. And a control unit that controls at least one of recording of data on the magnetic disk device and reproduction of data recorded on the magnetic disk device.

  Here, as the electronic device, a computer (in the case of a personal computer, it may be a laptop type or a desktop type), a portable or stationary audio / visual device, a DVD recorder, a PDA (Personal Digital). Assistance), electronic dictionary, camera, display device, mobile phone, game device, car navigation device, robot device, and other electrical appliances. The control unit is, for example, a CPU (Central Processing Unit) or an electronic circuit that exchanges signals with the magnetic disk device.

  According to the present invention, the carriage is reliably latched against the impact force, and when the impact force is not applied, the inertia lever is reliably positioned at the neutral position to prevent unnecessary latching, and the magnetic disk device. Can be miniaturized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an appearance of a HDD 100 according to an embodiment of the present invention when a top cover (not shown) is removed, and FIG. 2 shows a disk, carriage, lamp, and inertia in the HDD 100. FIG. 3 is a view showing the latch mechanism, and FIG. 3 is an enlarged view of the vicinity of the latch arm in FIG.

  As shown in FIG. 1, the HDD 100 according to this embodiment has a substantially rectangular case 1 having an upper surface opened and the top cover fixed by, for example, screwing, and the case 1 includes a magnetic disk 2. And a spindle motor 3 that supports and rotates the magnetic disk 2 and a carriage that supports a plurality of magnetic heads 45 that write and read information on the magnetic disk 2 movably with respect to the magnetic disk 2. 4, a VCM (voice coil motor) 5 that positions the magnetic head 45 by rotating the carriage 4, and the magnetic head 45 from the magnetic disk 2 when the magnetic disk 2 is not rotating (when the drive of the HDD 100 is stopped). The ramp 6 for retracting to a separated position and the magnetic head 45 to be latched to the ramp 6 during the retracting Like substrate unit 8 having the inertia latch mechanism 7 and the head amplifier IC8a the like are accommodated.

  The magnetic disk 2 is formed to have a diameter of 1 inch, for example, and has magnetic recording layers on the upper surface and the lower surface. An engagement hole at the center of the magnetic disk 2 is fitted into a hub (not shown) of the spindle motor 3, and is held by an upper clamp spring 3a by, for example, screwing. The diameter of the magnetic disk 2 may be other diameters such as 2.5 inches and 3.5 inches.

  As shown in FIGS. 1 and 2, the carriage 4 includes a bearing unit 41 fixed to the bottom surface of the case 1, for example, two arms 42 provided to extend from the bearing unit 41, and the bearing unit 41. On the other hand, it has a base end portion 43 provided on the opposite side to the arm 42.

  A suspension 44 is fixed to the extended end of the arm 42, and a magnetic head 45 is attached to the tip of the suspension 44. The carriage 4 is rotatable about the bearing unit 41, and the magnetic head 45 is movable between an arbitrary position on the magnetic disk 2 and the lamp 6 by the rotation. The magnetic head 45 is electrically connected to the substrate unit 8 via the flexible substrate 9. As shown in FIG. 1, a stopper 11 made of, for example, rubber or resin is provided between the base end portion 43 and the magnetic disk 2, and when the carriage 4 rotates clockwise, the stopper 11 In this way, the magnetic head 45 does not overrun the ramp 6.

  As shown in FIGS. 1 to 3, a VCM coil 53 is fixed to the base end portion 43. The VCM coil 53 includes a magnet 52 (see FIG. 1) provided so as to cover the VCM coil 53 and one yoke 51 (see FIG. 1) provided so as to further cover the magnet 52 and the latch arm 71. 1 and FIG. 2) and the other yoke (not shown) fixed to the case 1 below the magnet 52 constitutes the VCM 5. By energizing the VCM coil 53 through the substrate unit 8 and the flexible substrate 9, the carriage 4 is rotated and the magnetic head 45 is moved and positioned on a desired track of the magnetic disk 2.

  The inertia latch mechanism 7 includes a first recess and a second recess formed in the base end portion 43, a latch arm 71 provided at the left corner of the case 1 near the base end portion 43, and the latch arm 71 on the carriage 4. And a torsion coil spring 73 that urges the latch arm 71 in a direction opposite to the rotation direction. The torsion coil spring is formed on the back surface of the yoke 51. And a support shaft 74 that supports 73.

  4 is a perspective view of the latch arm 71 and the torsion coil spring 73 in the planar direction, and FIG. 5 is a perspective view of the latch arm 71 and the torsion coil spring 73 in the back direction. As shown in FIGS. 1 to 5, at both ends in the longitudinal direction of the latch arm 71, a first claw portion that can be engaged with a first recess of the base end portion 43 of the carriage 4, and a base end portion The second claw portion that can be engaged with the second concave portion 43 is formed so as to sandwich the rotating shaft 72. When an impact or vibration is applied to the HDD 100, the latch arm 71 rotates about the rotation shaft 72 due to the inertia caused by the impact or vibration. When the latch arm 71 rotates in the clockwise direction (the direction of arrow A in FIG. 3), the first claw portion engages with the first concave portion of the base end portion 43 of the carriage 4 and counterclockwise. When rotating in the direction of arrow B in FIG. 3, the second claw portion engages with the second recess, thereby restricting the rotation of the carriage 4 and retracting to the lamp 6. It is possible to prevent the magnetic head 45 from falling off the ramp 6 and jumping out to the surface of the magnetic disk 2. That is, the latch arm 71 can perform a latch operation corresponding to the inertia in both rotational directions.

  Further, the latch arm 71 is formed to be thicker from the rotating shaft 72 toward the longitudinal direction. Thus, by increasing the position far from the rotation shaft 72, the torque can be increased and the rotation operation, that is, the latch operation can be performed stably. In consideration of the magnitude of torque, the material of the latch arm 71 is preferably large in specific gravity. For example, brass is used, but the material is not limited to this. For example, a resin containing tungsten may be used. Thereby, cost can be reduced compared with alloys, such as a brass, implement | achieving sufficient specific gravity.

  The torsion coil spring 73 supported by the support member on the back surface of the yoke 51 includes a first arm portion 73a, a second arm portion 73b, and a coil portion 73c. Further, as shown in FIG. 4, a first convex portion 71c and a second convex portion 71d are formed on the both side surfaces of the latch arm 71 at positions at a predetermined distance d from the rotation axis. The first arm portion 73a urges the latch arm 71 from both sides with the first convex portion 71c as the fulcrum and the second arm portion 73b as the fulcrum, respectively. With this configuration, the torsion coil spring 73 keeps the latch arm 71 in a neutral position when the magnetic head 45 is retracted to the ramp 6 and no impact or vibration is applied to the HDD 100, and when it is loaded. Thus, the latch arm 71 is prevented from rotating until there is no need for latching.

  If this biasing force is too strong, the latch arm 71 rotation start timing at the time of impact or vibration may be delayed by the rotation of the carriage 4 and the latch may fail, and if it is too weak, the latching position is held at the neutral position. Therefore, the force is adjusted to a range in which such a situation does not occur. Further, the predetermined distance d is, for example, a distance of 2 mm or more when the diameter of the magnetic disk 2 is 1 inch. The longer the distance d, the more stable the latch arm 71 can be kept at the neutral position. .

  FIG. 6 is an enlarged perspective view of the vicinity of the lamp 6. As shown in FIGS. 1, 2, and 6, the ramp 6 is provided at a position on the outer side of the magnetic disk 2 from the right bottom surface to the side surface of the case 1. The ramp 6 is formed with a slope 6a on which the magnetic head 45 rides from the vicinity of the outer edge of the magnetic disk 2 when the magnetic head 45 is unloaded, and on the unload side (in a direction away from the magnetic disk 2) from the slope 6a. Is formed with a step portion 6b on which a tab 46 formed at the tip of the magnetic head 45 is placed when the magnetic disk 2 is not rotated, that is, when the magnetic head 45 is retracted to the ramp. Since the tab 46 is placed on the stepped portion 6b, even if a predetermined impact or vibration is applied to the HDD 100 and the magnetic head 45 is likely to move to the magnetic disk 2 side, the movement of the tab 46 is the stepped portion. 6b, the rotation of the carriage 4 can be delayed when the start of the rotation of the latch arm 71 in the inertia latch mechanism 7 is delayed, and the inertia latch mechanism 7 is assisted and the latch operation fails. Can be prevented.

  Next, the operation of the inertia latch mechanism 7 in this embodiment will be described. FIG. 7 is a diagram showing a latch operation when a clockwise inertia is applied, and FIG. 8 is a diagram showing a latch operation when a counterclockwise inertia is applied.

  As shown in FIG. 7, when the HDD 100 is not operating (when the magnetic disk 2 is not rotating), when an impact or vibration is applied that causes the carriage 4 to rotate counterclockwise (magnetic disk 2 direction), The latch arm 71 is rotated counterclockwise (in the direction of the arrow B in the figure) so as to be synchronized with the rotation of the carriage 4 by the inertia of the impact or vibration, and the second claw portion 71b is 2 is engaged with the recess 43b. At this time, the latch arm 71 rotates against the urging force of the first arm portion 73 a of the torsion coil spring 73. More specifically, the latch arm 71 rotates when the inertia due to impact or vibration is larger than the force obtained by adding the frictional force of the rotation shaft 72 to the biasing force. By this operation, the carriage 4 is latched and its rotation is restricted, and the magnetic head 45 can be prevented from jumping out onto the magnetic disk 2.

  Further, as shown in FIG. 8, when the HDD 100 is not in operation, when an impact or vibration is applied that causes the carriage 4 to rotate in the clockwise direction (the direction away from the magnetic disk 2), the rotation of the carriage 4 is as follows. Although it is regulated by the stopper 11 shown in FIG. 1, it can be considered that it rotates counterclockwise by rebounding to the stopper 11 or the like. In this case, the latch arm 71 is rotated clockwise (in the direction of arrow A in the figure) by the inertia, and the first claw portion 71 a is engaged with the first concave portion 43 a of the carriage 4. At this time, the latch arm 71 rotates against the urging force of the second arm portion 73 b of the torsion coil spring 73. Also by this operation, the carriage 4 is latched and the magnetic head 45 can be prevented from popping out.

  That is, the inertia latch mechanism 7 in the present embodiment can latch the carriage corresponding to the inertia in both rotational directions. In addition, when a large impact or vibration is not applied due to the urging force of the torsion coil spring 73, the latch arm 71 is reliably corrected to the neutral position. It is possible to prevent the load operation from being hindered.

  In addition, since the neutral correction can be realized, an inertia latch mechanism can be realized by a latch arm having a so-called single latch structure, and the number of parts can be reduced and space can be saved. Since the torsion coil spring 73 for neutral correction is also provided along the longitudinal direction of the latch arm 71, it does not take up space. Space saving is particularly effective for a small HDD such as a 1-inch HDD.

  It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

  In the above-described embodiment, the step portion 6b provided in the lamp 6 can adopt various shapes. FIG. 9 is a diagram showing variations in the shape of the stepped portion 6b.

  The step portion 6b may be formed in a substantially vertical shape as shown in FIG. 5A, may be formed in an R shape as shown in FIG. It may be formed in a slope shape as shown, or may have other shapes. Regardless of the shape, it is possible to restrict the movement of the tab 46 and cover the delay of the rotation operation of the latch arm 71 to surely perform the latch operation.

  In the above-described embodiment, the latch arm 71 is corrected to the neutral position by the biasing force of the torsion coil spring 73. However, in addition to the torsion coil spring 73, the magnet 52 may be used. FIG. 10 is a view showing the inertia latch mechanism 7 when the magnet 52 is further used as the neutral correction means.

  As shown in the figure, a convex portion 75 is provided on the carriage side of the rotation shaft 72 of the latch arm 71, and an iron piece 76 as a magnetic body is provided at the tip of the convex portion 75. On the other hand, the suction part 52a is formed by cutting the vicinity of the rotating shaft 72 of the magnet 52 forming the VCM 5 into a mountain shape. As a result, when no impact or vibration is applied to the HDD 100, the iron piece 76 is attracted by the suction portion 52a, so that the latch arm 71 is maintained in a neutral position and coupled with the biasing force of the torsion coil spring 73. Neutral correction can be performed stably. Further, even if the start of rotation of the latch arm 71 is delayed when an impact or vibration is applied, the rotational force of the carriage 4 can be weakened by the attractive force of the magnet 52, and the failure of the latch operation can be prevented. it can. In addition, the said convex part 75 can maintain a neutral position more stably if it forms long as much as possible.

  The HDD 100 in the above-described embodiment includes, for example, a computer (in the case of a personal computer, a laptop type or a desktop type), portable and stationary audio / visual devices, a DVD recorder, a PDA ( Personal Digital Assistance), electronic dictionary, camera, display device, mobile phone, game device, car navigation device, robot device, etc., CPU, etc. for controlling recording and reproduction of information on the magnetic disk 2 by exchanging signals with the HDD 100 and electric circuits The present invention can be applied to any electronic device having the above.

1 is a perspective view showing an appearance of a HDD 100 according to an embodiment of the present invention when a top cover (not shown) is removed. FIG. 2 is a perspective view showing a disk, a carriage, a lamp, and an inertia latch mechanism in the HDD 100. FIG. FIG. 3 is an enlarged perspective view of the vicinity of a latch arm in FIG. 2. 4 is a perspective view of a latch arm 71 and a torsion coil spring 73 in a planar direction. FIG. FIG. 5 is a perspective view of the latch arm 71 and the torsion coil spring 73 in the back direction. FIG. 6 is an enlarged perspective view of the vicinity of a lamp 6. FIG. 6 is a diagram showing a latch operation when a clockwise inertia is applied. FIG. 6 is a diagram showing a latch operation when an inertia in a counterclockwise direction is applied. It is the figure which showed the variation of the shape of the level | step difference part 6b. It is the figure which showed the inertia latch mechanism 7 at the time of further using the magnet 52 as a neutral correction | amendment means.

Explanation of symbols

2 ... Magnetic disk 3 ... Spindle motor 4 ... Carriage 5 ... VCM
6 ... Ramp 6a ... Slope 6b ... Step 7 ... Inertia latch mechanism 11 ... Stopper 43 ... Base end 43a ... First recess 43b ... Second recess 45 ... Magnetic head 46 ... Tab 51 ... Yoke 52 ... Magnet 52a ... Suction part 71 ... Latch arm 71a ... first claw part 71b ... second claw part 71c ... first convex part 71d ... second convex part 72 ... rotating shaft 73 ... torsion coil spring 73a ... first arm part 73b ... second arm portion 75 ... convex portion 76 ... iron piece 100 ... HDD

Claims (9)

An inertia latch mechanism used in a magnetic disk device,
It has a magnetic head at one end and first and second recesses at the other end, and rotates between a magnetic disk and a ramp about a rotation axis that is substantially perpendicular to the recording surface of the magnetic disk. A carriage capable of moving the head,
It is sandwiched between a first claw portion that can be engaged with the first recess, a second claw portion that can be engaged with the second recess, and the first claw portion and the second claw portion. As described above, when a predetermined external force is applied to the magnetic disk device, a clockwise direction and a counterclockwise direction about the rotation axis are provided. A latch arm provided so as to be freely rotatable in a rotating direction;
And an urging means for urging the latch arm in a direction to restrict the rotation of the latch arm when the predetermined external force is not applied to the magnetic disk device. The inertia latch mechanism according to claim 1,
A cover member that covers a part of the latch arm and the carriage;
The biasing means is
A torsion coil spring that biases the latch arm so as to restrict the rotation of the latch arm in a clockwise direction and a counterclockwise direction;
An inertia latch mechanism, comprising: a support member provided on a back surface of the cover member and supporting the torsion coil spring. The inertia latch mechanism according to claim 2,
The torsion coil spring has first and second arm portions;
The latch arm is provided at a predetermined distance from a rotation axis of the latch arm, and has a first protrusion for contacting the first arm and receiving the urging force in the clockwise direction, An inertia latch mechanism comprising a second protrusion for contacting the second arm and receiving the counterclockwise biasing force. The inertia latch mechanism according to claim 1,
The inertial latch mechanism according to the present invention, wherein the latch arm is formed such that the thickness at both ends is thicker than the thickness near the rotation shaft. The inertia latch mechanism according to claim 1,
An inertia latch mechanism, wherein the latch arm is made of a resin containing tungsten. The inertia latch mechanism according to claim 1,
A tab is provided at the tip of the magnetic head,
The lamp is
A slope on which the tab rides when the magnetic head is unloaded;
An inertia latch mechanism comprising: a step portion formed in the unload direction with respect to the slope and on which the tab is placed when the magnetic disk is not rotated. The inertia latch mechanism according to claim 1,
The latch arm has a convex portion provided in the direction of the carriage from the vicinity of the rotation shaft, and a magnetic body provided at the tip of the convex portion,
The carriage includes a magnet that forms a part of a voice coil motor and that can attract the magnetic body at the other end. A magnetic disk device having an inertia latch mechanism,
A magnetic disk;
A spindle motor for supporting and rotating the magnetic disk;
It has a magnetic head at one end and first and second recesses at the other end, and rotates between a magnetic disk and a ramp about a rotation axis that is substantially perpendicular to the recording surface of the magnetic disk. A carriage capable of moving the head,
A voice coil motor for rotating the carriage;
The first claw portion engageable with the first recess, the second claw portion engageable with the second recess, and the first claw portion and the second claw portion. As described above, when a predetermined external force is applied to the magnetic disk device, a clockwise direction and a counterclockwise direction about the rotation axis are provided. A latch arm provided so as to be freely rotatable in a rotating direction;
An urging means for urging the latch arm in a direction for restricting the rotation of the latch arm when the predetermined external force is not applied to the magnetic disk device. An electronic device having a magnetic disk device,
A magnetic disk;
A spindle motor for supporting and rotating the magnetic disk;
It has a magnetic head at one end and first and second recesses at the other end, and rotates between a magnetic disk and a ramp about a rotation axis that is substantially perpendicular to the recording surface of the magnetic disk. A carriage capable of moving the head,
A voice coil motor for rotating the carriage;
The first claw portion engageable with the first recess, the second claw portion engageable with the second recess, and the first claw portion and the second claw portion. As described above, when a predetermined external force is applied to the magnetic disk device, a clockwise direction and a counterclockwise direction about the rotation axis are provided. A latch arm provided so as to be freely rotatable in a rotating direction;
A magnetic disk device having urging means for urging the latch arm in a direction that restricts rotation of the latch arm when the predetermined external force is not applied to the magnetic disk device;
An electronic apparatus comprising: a control unit that controls at least one of recording of data on the magnetic disk device and reproduction of data recorded on the magnetic disk device.

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