KR20020008271A - Actuator latching apparatus for disk drive - Google Patents

Abstract

PURPOSE: An actuator latching device of a disk drive is provided to sensitively act on a shock having rectilinear and rotary components applied to a housing, to effectively control the movement of an actuator. CONSTITUTION: An actuator latching device of a disk drive includes an actuator(11) for moving a head between a data area(14b) and a parking area(14a) of a disk(14) set inside a housing(10), a moving lever(20) capable of moving between the first position for controlling the movement of the actuator placed in the parking area and the second position out of a movement section of the actuator, and a pressing member(21) for pressing the moving lever to the second position. The device further has a rotating member that is moved to a control direction in which the moving lever is moved to the first position by external force and to a cancellation direction in which the moving lever returns to the original position according to elastic restoring force of the pressing member, and an elastic unit that rotates the rotating member to the control direction to allow the rotating member to push the moving lever to the first position.

Description

Actuator latching apparatus for disk drive

The present invention relates to an actuator latching apparatus of a disc drive for restraining rotation of an actuator.

A disk drive, such as a hard disk drive, is one of the auxiliary storage devices of a computer, and is a device for recording data on or reproducing the recorded data.

When the spindle motor inside the hard disk stops driving, the speed of the disk rotating by the spindle motor gradually decreases. At this time, the head is supported by the flow of air in the upper portion of the disk, and then descends to the surface of the disk. However, if the head comes into contact with the surface of the disc, the disc or the data recorded on the disc may be damaged. In order to prevent this risk, the disc is provided with a so-called parking area in which the head rests. The parking area is an area on the disc disc in which no data is recorded, and is a predetermined area on the disc where the head is moved and seated before contacting the disc surface. This parking area is provided inside or outside the disk.

On the other hand, vibration or shock may be applied to the hard disk drive in the standby state. At this time, the head seated in the parking area is out of the parking area and invades the data area in contact with the disk. The head invading the data area is in contact with the disk surface and damages the disk surface as well as the data stored on the disk. In order to prevent the above problems from occurring, by restraining the rotation of the actuator supporting the head to support the head seated in the parking area with a constant force so that the head cannot be moved from external shock or vibration. Latching devices are used.

1 is a schematic partial perspective view of a latching device disclosed in US Pat. No. 5636090.

Referring to the drawings, the actuator 2 supporting the head 1 is rotatably installed about the pivot 3. A latch 4 for restraining rotation of the actuator 2 is rotatably supported by a latch pin 5 provided in the housing 10. The latch 4 is formed with a hole 4a engaged with the finger 2a of the actuator 2. The latch 4 is elastically pressurized by the latch spring 6 to keep the hole 4a and the finger 2a separated. In this state, when the shock is received from the outside in the clockwise direction, the actuator 2 and the latch 4 are subjected to rotational inertia. By this rotational inertia force, each of the actuator 2 and the latch 4 receives a rotational force in the counterclockwise direction. However, since the latch 4 reacts more sensitively to the rotational inertia than the actuator 2, the latch 4 is rotated by being applied counterclockwise before the actuator 2, so that the hole 4a and the finger 2a are coupled to each other. 2) bound.

By the way, in the latch system operating as described above, the actuator 2 cannot substantially coincide with the pivot 3 in the center of gravity. That is, the center of gravity of the actuator 2 is out of the pivot (3) due to the manufacturing stationary error. In addition, the external shock applied to the latching device substantially has a straight component and a rotational component. At this time, when the straight component is large among the external shocks applied, an inertial force due to the eccentric mass of the actuator 2 is generated. The inertial force resulting from such eccentric mass causes the actuator 2 to rotate and the latch 4 not to rotate. In this case, there is no alternative that can prevent the head 1 from invading the data area.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide an actuator latching device of a disk drive having an improved structure so that an actuator can be restrained from an inertia force caused by an external impact.

1 is a schematic perspective view showing an actuator latching device of a conventional disk drive.

2 is a schematic plan view of an actuator latching device of a disk drive according to an embodiment of the present invention;

3 is a cross-sectional view of main parts of the actuator latching device shown in FIG. 2;

Figure 4 is an exploded perspective view of the main portion extract of the actuator latching device shown in FIG.

5 is a plan view showing a state before an impact is applied to the housing.

Fig. 6A is a partial plan view showing the state of the latching device before the impact is applied.

FIG. 6B is a cross-sectional view taken along the line II of FIG. 6A. FIG.

Figure 7a is a plan view showing the operation of the mass member subjected to the inertia force by the impact.

FIG. 7B is a cross-sectional view taken along the line II-II of FIG. 7A. FIG.

8A to 8D are each a schematic plan view showing the operation of the latching device when a linear inertial force acting on a predetermined x-y axis is applied to the mass member.

9A to 9D are each a schematic plan view showing the operation of the latching device when a straight member of the mass member acts out of a predetermined x-y axis.

10 is a schematic plan view for explaining the operation of the latching device when the inertial force of the rotating component is applied to the mass member.

11 is a schematic plan view showing the latching device is repositioned after the applied shock disappears, and the actuator is unlatched.

<Description of Symbols for Major Parts of Drawings>

10.Housing 11. Actuator

13. Boy coil motor 14. Disk

15.Head 17.Bush

20. Rotating lever 21. Pressure member

30. Rotating member 40. Elastic unit

41. Elastic bar 43. Mass member

An actuator latching device for a disc drive according to the present invention for achieving the above object comprises: an actuator rotatably installed in the housing to reciprocate a head supported at one end between a data area and a parking area of a disc installed in the housing; Rotating lever is rotatably installed in the housing, one side is located in the rotational section of the actuator, the rotational lever is movable between a first position for regulating the rotation of the actuator located in the parking area, and a second position out of the rotational section ; A pressing member for pressing the pivot lever to the second position; A rotating member rotatably installed in the housing, the rotating member being moved in a restriction direction for moving the pivoting lever to the first position by an external force and in a release direction for restoring the position by the elastic restoring force of the pressing member; And an elastic unit which is elastically restored again after the rotation member is rotated in a regulating direction so that the rotation member pushes the rotation lever to the first position while being elastically moved under the inertia force applied to the housing. It is characterized by including.

Hereinafter, an actuator latching apparatus of a disk drive according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 and 3, the actuator latching device of the disc drive according to the embodiment of the present invention, the actuator 11 is installed rotatably in the housing 10, and the rotation of the actuator 11 is selectively selected. A rotating lever 20 rotatably installed in the housing 10 so as to interfere with each other, a pressing member 21 for pressing the rotating lever 20 to one side, and a rotating member installed in the housing 10. 30) and an elastic unit 40. Here, the optical disk 14 having the data area 14b and the parking area 14a is rotatably installed in the housing 10. On the other hand, the parking area 14a is provided at a central portion of the optical disk 14 in a predetermined section, but may be provided outside the optical disk 14a.

The actuator 11 is rotatably installed about the pivot 12 by the voice coil motor 13 installed in the housing 10. The recording / reproducing head 15 is supported at the end of the actuator 11. An actuator 11 reciprocates the head 15 between the parking area 14a and the data area 14b. Here, it is preferable that a locking groove 11a is formed at one side of the actuator 11 to prevent the release of the sliding lever when the interference with the rotation lever 20 is released.

The rotation lever 20 is rotatably installed on the rotation shaft 16 installed in the housing 10. The rotation lever 20 is selectively rotated by a predetermined section by an external force, thereby regulating the rotation of the actuator 11. To this end, the rotation lever 20 is movable between a predetermined first position and a second position. Here, the first position is a state as shown by a solid line in FIG. 2, and the rotation lever 20 is positioned in the rotation section of the actuator 11 to thereby rotate the actuator 11 located in the parking area 14a. Regulating position. In addition, the second position is a position such that the rotation lever 20 does not restrict the rotation of the actuator 11 outside the rotation section of the actuator 11, as shown by a virtual line in FIG. 2. The rotation lever 20 is preferably installed so that its center of gravity coincides with the rotation shaft 16. Accordingly, one end 23 of the rotation lever 20 is selectively interfered with the actuator 11, and the other end 24 is interfered with the rotation lever 30. And, the other end 24 of the rotation lever 20 is provided with a lever pin 24a for interference with the rotary lever 30.

The pressing member 21 is for pressing the pivoting lever 20 to the second position and is integrally formed with the pivoting lever 20. Specifically, the pressing member 21 is formed to extend from the rotation center of the rotation lever 20, the end of which is supported inside the housing 10. Therefore, when the rotating member 20 is moved in the A direction, the pressing member 21 is elastically deformed to provide the repulsive force in the B direction to the rotating member 20.

The rotating member 30 is rotatably supported on the outer circumference of the bush 17 fixed to the housing 10. In addition, the rotation member 30 is rotated by a predetermined angle in the control direction (C) by being pushed by the elastic unit 40, it is possible to restore the position in the release direction (D) by being pushed by the rotation member 20 rotated in the B direction. . Here, the restricting direction (C) is a direction for moving the pivoting lever 20 to the first position, and the release direction (D) is a direction in which the pivoting lever 20 is restored by the elastic force of the pressing member 21. to be. As shown in FIG. 4, the rotation member 30 has a center hole 31 through which the elastic bar 41 to be described later passes. In addition, four guide holes 33 are formed in the rotating member 30 so as to be symmetrical with respect to the elastic bar 41 passing through the center hole 31 to form an equal interval. In addition, the rotating member 30 is provided with an extension part 35 extending from one side so as to interfere with the lever pin 24a of the pivoting lever 20 during rotation.

The elastic unit 40 is an elastic bar 41 is installed on the central axis of rotation of the rotating member 30, and a mass member is installed around the rotating member 30 so that the center thereof is supported by the elastic bar 41 ( 43). The elastic bar 41 may be, for example, a metal wire capable of elastic restoration or a long coil spring. One end of the elastic bar 41 is fixed to the bottom of the long hole (17a) formed in the bush 17, the other end is fixed to the center of gravity of the mass member 43. The elastic bar 41 is accommodated in the long hole 17a and passes through the center hole 31 of the rotating member 30 to support the mass member 43. Therefore, the elastic bar 41 freely supports the movement of the mass member 43 in the state of not interfering with the bush 17 and the rotating member 30 during elastic deformation. Here, the upper end of the bush 17 is coupled to the clamper 50 to prevent the separation of the rotating member (30). The mass member 43 is positioned above the rotating member 30 with its center of gravity supported by the elastic bar 41. The mass member 40 has a plurality of contact pins 43a corresponding to each of the guide holes 33 of the rotating member 30. That is, the total of four contact pins 43a are symmetrical with respect to the center of mass of the mass member 40 and protrude from the lower side to form an equal interval. In addition, the contact pins 43a are installed in the guide hole 33 to be in contact with the regulation direction C. That is, in the state in which the rotating member 30 is biased toward the release direction D side, all of the contact pins 43a are positioned to contact the inner wall of the restricting direction C side of the guide hole 33.

On the other hand, the housing 10 is preferably provided with a stopper 19 to limit the rotation range of the rotating member 30 in the release direction (D).

An operation of the actuator latching device of the disk drive according to the embodiment of the present invention having the above configuration will be described in detail.

First, when there is no impact from the outside of the housing 10 including the latching device in the state where the actuator 11 is located in the parking area 14a, it is maintained as shown in FIG. That is, the rotation lever 20 is biased in the B direction by the pressing force of the pressing member 21, and is maintained in a state not located in the rotation range of the actuator 11. At this time, the postures of the rotating member 30 and the elastic unit 40 are fixed as shown in FIGS. 6A and 6B.

On the other hand, in the above state, when the shock is transmitted to the housing 10, the mass member 43 supported by the elastic bar 41 receives the inertial force in the opposite direction to which the impact is applied, as shown in Figs. 7a and 7b. Move as shown. Then, at least one of the contact pins 43a 'of the contact members 43a of the mass member 43 presses the inner wall of the guide hole 33 of the rotating member 30 in the restricting direction C. Then, the remaining contact pins 43a are separated from the inner wall of the guide hole 33 so as not to interfere with the rotation of the rotating member 30. In this case, the rotating member 30 rotates the rotation lever 20 in the A direction while being rotated a predetermined angle in the regulating direction (C). At this time, the rotating member 30 is rotated only in the regulation direction (C) regardless of the direction of the inertial force applied to the mass member 43. On the other hand, the rotation lever 20 is pushed by the rotation member 30 to rotate in the A direction, one end 23 of the rotation lever 20 is coupled to the engaging groove (11a) of the actuator (11). In this case, the actuator 11 is caught by the rotation lever 20 so that the actuator 11 does not leave the parking area 14a. Here, in case of external impact, the inertia force may also be applied to the actuator 11 to rotate, but the response is late because the weight of the actuator 11 is heavier than the mass member 43, the rotating member 30, or the like. Therefore, since the latching device according to the embodiment of the present invention reacts before the actuator 11 is rotated by the inertial force, it becomes possible to latch the actuator 11.

On the other hand, when the direction of inertial force acting on the mass member 43 is different, the operation of the rotating member 30 and the rotation lever 20 will be described in more detail.

First, as shown in FIGS. 8A to 8D, when the inertial force F acting on the mass member 43 is applied in a symmetrical direction between the contact pins 43a, that is, in a predetermined XY axis direction, the contact pins Only one of the contact pins 43a 'of the contact pins deviating from the direction in which the inertial force F acts in 43a causes contact pressure on the inner wall of the guide hole 33. The remaining contact pins 43a do not contact pressurize at least the inner wall of the guide hole 33. Therefore, as described above, as the rotating member 30 is rotated in the control bar C, the rotating lever 20 can be rotated in the A direction. Here, the contact pins 43a 'for contact-pressing the rotating member 30 are indicated by black dots on the drawings.

In addition, as shown in Figs. 9A to 9D, when the direction of inertia force F applied to the mass member 43 is a straight line off the XY axis, the direction of inertia force F acts as a reference. Only the contact pins 43a 'biased to one side press contact the inner wall of the guide hole 33. The other contact pins 43a do not at least pressurize the inner wall of the guide hole 33. Therefore, the rotating member 30 is forcibly rotated in the regulating direction C to rotate the rotation lever 20. Here too, the contact pins 43a 'for contact-pressing the inner wall of the guide hole 33 are indicated by black dots.

In addition, as shown in FIG. 10, when the inertia force F in the rotational direction, that is, the regulating direction C, acts on the mass member 43, all the contact pins 43a are formed on the inner wall of the guide hole 33. Contact pressure to rotate the rotating member 30 in the regulation direction (C).

As described above, when the mass member 43, the rotating member 30 and the rotation lever 20 are interlocked by the inertial force due to the impact, the actuator 11 is shown in Figure 1, the locking groove 11a Rotation is constrained in the direction away from the parking area 14a by being caught by one end of the rotation lever 20. Thus, damage to the disk 14 due to impact can be prevented. In particular, unlike the related art, since the latching device of the present invention can operate regardless of the direction of the impact applied to the housing 10, the actuator 11 can be easily restrained. In addition, although not shown, even if the inertial forces of the woven component and the rotating component act on the mass member 43 at the same time, the rotating member 30 can be rotated by the mass member 43 in the restricting direction (C).

On the other hand, when the inertial force F acts in the release direction D, the inertial force acts on the actuator 11 in the same direction. However, in this case, all of the contact pins 43a are spaced apart from the inner wall of the guide hole 33 so as not to be hard on the rotating member 30. Furthermore, when the mass member 43 is severely moved because the inertial force is so great, the contact pin 43a may pressurize the inner wall of the guide hole 33 in the release direction D, but the rotary member 30 may Since it is stuck to the stopper 19, it will not rotate.

In addition, even if an inertial force acts on the actuator 11 in the release direction D, it is prevented from being mechanically rotated by being caught by the actuator stopper 18 (see Fig. 1) installed in the housing 10.

Subsequently, when the impact applied to the housing 10 disappears, the rotation lever 20 is moved from the dotted line to the solid line state as shown in FIG. 11 by the elastic restoring force of the pressing member 21. Then, the rotation lever 20 rotates the rotation lever 30 in the release direction D to move to the original position. At the same time, the mass member 43 is moved to its original position by the elastic restoration of the elastic bar 41. In this case, the rotation lever 20 is moved out of the rotation section of the actuator 11, and the rotation lever 20 can be rotated to the data region 14b by the driving force of the voice coil motor 13 of the actuator 11.

According to the actuator latching device of the disk drive according to the present invention as described above, even if the impact having a linear component and a rotating component is applied to the housing, the latching device reacts sensitively to effectively regulate the rotation of the actuator. Therefore, it is possible to prevent the actuator from leaving the parking area regardless of the impact in any direction, thereby preventing damage to the disk, thereby improving the reliability and stability of the product.

Claims (7)

An actuator rotatably installed in the housing to reciprocate the head supported at one end between the data region and the parking region of the disk installed in the housing; Rotating lever is rotatably installed in the housing, one side is located in the rotational section of the actuator, the rotational lever is movable between a first position for regulating the rotation of the actuator located in the parking area, and a second position out of the rotational section ; A pressing member for pressing the pivot lever to the second position; A rotating member rotatably installed in the housing, the rotating member being moved in a restriction direction for moving the pivoting lever to the first position by an external force and in a release direction for restoring the position by the elastic restoring force of the pressing member; And An elastic unit which is elastically restored after the rotation member is rotated in a regulating direction so that the rotation member pushes the rotation lever to the first position while being elastically moved by the inertia force applied to the housing. Actuator latching device for a disk drive, characterized in that. The method of claim 1, wherein the elastic unit, An elastic bar installed on a central axis of rotation of the rotating member; And a mass member installed around the rotating member such that a center thereof is supported by the elastic bar and contact-pressurizing the rotating member in the restricting direction while elastically deforming the elastic bar by an inertia force caused by an external impact. Actuator latching device for disk drives. The method of claim 2, The mass member has at least four contact pins which are symmetrical with respect to the elastic bar and formed at equal intervals, At least one of the contact pins the actuator latching device of the disk drive, characterized in that for pressing the rotating member when the elastic deformation of the elastic bar, the rest are spaced apart so that the rotating member can be rotated in the control direction. . The method of claim 3, A plurality of guide holes are formed in the rotating member to correspond to the contact pins. The contact pins of the actuator of claim 2, wherein the contact member is provided to be in contact with the direction of the regulation direction in the guide hole when the rotating member is biased toward the release direction side. The method according to any one of claims 2 to 4, And a bush fixed to the housing and rotatably supporting the rotating member on an outer circumference thereof, and having a central hole formed in the center thereof to accommodate and support the elastic bar. The method of claim 1, The pressurizing member is formed to extend from one side of the rotating member, the actuator latching device of the disk drive, characterized in that the support is supported on one side of the housing. The method according to any one of claims 1 to 4, An actuator latching device of a disc drive, characterized in that a stopper is provided within the housing to define a range of rotation of the rotating member in the release direction.