JPH04302877A - Carriage lock mechanism of optical disk device - Google Patents

Abstract

PURPOSE:To surely lock the carriage with an always stable attracting force irrespective of the manufacturing tolerance in the magnetic force attracting type carriage lock mechanism. CONSTITUTION:In the magnetic attracting type carriage lock mechanism locking the stop state of the carriage 25 by confronting the attracted member 32 being provided on the carriage 25 with a projection part 29a formed on a magnet 29 of a voice coil motor 27, a groove 33 along the rotary direction of the carriage 25 is formed on the projection part 29a and the attracted member 32 is provided on the groove 33 at the locked position; an always stable leakage magnetic flux is thus obtained.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a carriage lock mechanism that locks the movement of a magnetic head at a predetermined position in a magnetic disk drive (HDD) using the CSS method (contact start/stop method), for example. Regarding.

0002

[Prior Art] For example, in a magnetic disk drive employing the CSS method, in order to prevent the disk (recording medium) from being scratched when the magnetic head starts or stops, the innermost circumference of the disk is A CSS zone, which is an area unrelated to the data zone, has been established. When the power is off (when the disk is stopped), the magnetic head is in this CSS zone.
is touching the disc at the tip. Then, by turning on the power and increasing the rotation of the disk, the magnetic head floats and moves toward the outer circumference of the disk, that is, toward the data zone.

By the way, when the power is off, the magnetic head may move due to some kind of momentum (vibration), potentially damaging the surface of the disk. Therefore, a locking mechanism is required to lock the stopped state of movement of the magnetic head at a predetermined position, that is, the CSS zone.

[0004] As this type of locking mechanism, there is one that utilizes the magnetic force of a magnet. This uses, for example, a voice coil motor (VCM) magnet, and when the magnetic head is in the CSS zone, the carriage is fixed by the magnetic force of this magnet. FIG. 4 shows a conventional carriage lock mechanism. In FIG. 4, 11 is a carriage. This carriage 11 rotates about a shaft 12 as a fulcrum, and moves a magnetic head (not shown) attached to its tip in the radial direction of the recording medium. A voice coil motor (VCM) 13 includes a magnet 14, a coil 15, and a yoke (not shown). A cylindrical suction target member 17 is provided on the carriage 11 via a support member 16 . This attracted member 17 has a magnetic head with CSS.
When in the zone, it faces the protrusion 14a formed on the magnet 14. In this state, the attracted member 17 is attracted by the magnetic force of the magnet 14, and the carriage 11
is fixed.

[0005]

In the magnetic attraction type carriage lock mechanism as described above, the locking force is determined by the amount of leakage magnetic flux of the magnetic member with respect to the attracted member. That is, the more leakage magnetic flux that the attracted member receives, the stronger the locking force becomes. In the conventional locking mechanism, as shown in FIG. 5, when the attracted member 17 leaves in the direction normal to the rotating direction of the carriage 11 (in the direction of arrow a) in the locked position, it is received by the protrusion 14a of the magnet 14. Leakage magnetic flux is reduced. Therefore, depending on the manufacturing tolerance, it was not possible to obtain sufficient suction force, and the carriage 11 could not be reliably locked.

The present invention has been made in view of the above-mentioned points, and provides a magnetic disk that can always reliably lock a carriage with a stable attraction force, regardless of manufacturing differences, in a magnetic attraction type carriage lock mechanism. The purpose is to provide a carriage locking mechanism for the device.

[0007]

[Means for Solving the Problems] The present invention provides a magnetic attraction type carriage lock mechanism that locks the stopped state of a carriage by arranging an attracted member and a magnetic member to face each other. A groove is formed in the groove, and the member to be attracted is placed in the groove at a predetermined position.

[0008]

[Operation] According to the above structure, leakage magnetic flux is relatively stable at any position in the groove formed in the magnetic member. Therefore, by arranging the suctioned member in this groove, sufficient suction force can be obtained even if the suctioned member is separated in the direction normal to the rotating direction of the carriage, thereby ensuring that the carriage is can be locked.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A carriage lock mechanism for a magnetic disk drive according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a plan view showing the overall configuration. Figure 2
, 21 is a recording medium, and the CSS zone 23, which is an area unrelated to the data zone 22, is located on the innermost circumference of the recording medium.
has. In a CSS type magnetic disk device, the magnetic head 24 is on standby in this CSS zone 23.
When driven, it moves to the data zone 22 via the carriage 25. The carriage 25 is powered by a voice coil motor (VC
M) rotates about the shaft 26 as a fulcrum, and the magnetic head 2
4 in the radial direction of the recording medium 21. The voice coil motor 27 includes a yoke 28 and a magnet 2 shown in FIG.
9 and a coil 30, and the carriage 25 is rotated by electromagnetic action with the magnet 29 generated by energization of the coil 30.

Here, as shown in FIG.
5 is provided with a suction member 32 having an L-shaped cross section via a support member 31. This attracted member 32 moves with the rotation of the carriage 25, and when the carriage 25 is in a predetermined position (when the magnetic head 24 is located in the CSS zone 23 in the CSS system), it is attached to the magnet 29. It faces the formed protrusion 29a. In addition,
In FIG. 1, FIG. 1(a) is a plan view showing the configuration of the main parts, and FIG. 1(b) is a perspective view thereof. In the same embodiment, a groove 33 is formed in the protrusion 29a along the direction of rotation of the carriage 25. The attracted member 32 is formed to be disposed in this groove 33 in the locked position.

Next, the operation of this embodiment will be explained.

For example, when the power is turned off, in the CSS system, the carriage 25 is driven by the driving force of the voice coil motor 27, which is obtained by utilizing the electromotive current generated from the surplus rotation of the DD motor (disk rotation motor). rotates in the inner circumferential direction of the recording medium 21. As the carriage 25 rotates, the magnetic head 24 is set in the CSS zone 23 provided at the innermost circumference of the recording medium 21. The magnetic head 24 is CS
When moving to the S zone 23, the attracted member 32 provided on the carriage 25 via the support member 31 faces the protrusion 29a of the magnet 29. In this state, the attracted member 32 is attracted by the magnetic force of the magnet 29. As a result, the stopped state of the carriage 25, that is, the stopped state of the magnetic head 24 is locked.

Furthermore, when the power is turned on, the carriage 2
5 is the recording medium 2 by the driving force of the voice coil motor 27.
Rotates in the direction of the outer circumference of 1. With this rotation of the carriage 25, the attracted member 32
distance from. As a result, the locked state of the carriage 25 is released, and the magnetic head 24 moves from the CSS zone 23 to the data zone 22.

Here, when the carriage 25 is in the lock position during non-operation, the attracted member 32 is in the groove 33 formed in the protrusion 29a of the magnet 29. This groove 3
In No. 3, the leakage magnetic flux is relatively stable, so it is possible to prevent the lack of attractive force due to manufacturing tolerances.

FIG. 3 shows this situation. In the same figure (a), groove 3
3 shows the case where the cross-sectional shape of groove 3 is triangular, and FIG.
3 shows a case where the cross-sectional shape is rectangular. In either shape, leakage magnetic flux is relatively stable at any position within the groove 33. Therefore, in the locked position,
By arranging the member to be attracted 32 in this groove 33, it is possible to obtain sufficient suction force even if the member to be attracted 32 is separated in the normal direction (direction of arrow a) with respect to the rotating direction of the carriage 25. This allows the carriage 25 to be reliably locked.

[0017]

As described above, according to the present invention, in the magnetic attraction type carriage locking mechanism, a groove is formed in the magnetic member along the rotating direction of the carriage, and the attracted member is inserted into this groove at the lock position. Because of this arrangement, leakage magnetic flux received by the attracted member can be stabilized. Thereby, the carriage can always be reliably locked with a stable suction force, regardless of manufacturing differences.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of main parts of a carriage lock mechanism according to an embodiment of the present invention, with FIG. 1(a) being a plan view thereof and FIG. 1(b) being a perspective view thereof.

FIG. 2 is a plan view showing the overall configuration of the embodiment.

FIG. 3 is a diagram for explaining leakage magnetic flux according to the same embodiment.

FIG. 4 is a diagram illustrating the configuration of the main parts of a conventional carriage lock mechanism; FIG. 4(a) is a plan view thereof, and FIG. 4(b)
is its perspective view.

FIG. 5 is a diagram for explaining leakage magnetic flux caused by a conventional carriage lock mechanism.

[Explanation of symbols]

21... Recording medium, 22... Data zone, 23... CSS zone, 24... Magnetic head, 25... Carriage, 26... Axis, 27... Voice coil motor, 28... Yoke, 29... Magnet, 29a... Projection, 30... Coil , 31... Supporting member, 32... Attracted member, 33... Groove.

Claims (2)

[Claims] Claim 1: A magnetic head that seeks on a recording medium and records/reproduces data; a magnetic head that rotates about a predetermined axis;
a carriage for moving the magnetic head in the radial direction of the recording medium; and a magnetic member for locking the carriage when the carriage is in a predetermined position, the carriage having a groove along the rotating direction of the carriage. and an attracted member that moves with the rotation of the carriage and is disposed in the groove of the magnetic member when the carriage is at the predetermined position. Features a carriage lock mechanism for magnetic disk drives. 2. The carriage lock mechanism for a magnetic disk drive according to claim 1, wherein the magnetic member is a magnet of a voice coil motor that drives the carriage.