JPH0685263B2 - Supporting structure for running body - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a traveling body for moving a head for recording / reproducing data to / from a storage medium in an access direction in an optical disk device, a magneto-optical disk device, a magnetic disk device, or the like. The present invention relates to a support mechanism for a traveling body that supports a vehicle.

[Prior Art] In general, a magnetic disk device is often used as an auxiliary storage device in a computer system. In recent years, there has been a proposal to use an optical disk device that uses a photoreactive substance as a storage medium or a magneto-optical disk device that uses a magneto-optically reactive substance as a storage medium in an auxiliary storage device.

Among these various storage devices, the magnetic disk device has a gradually increasing storage density, and the optical disk device and the magneto-optical disk device have a very high storage density as a major feature.

As described above, in a device that stores data at a high density, since the recording tracks for storing the data are extremely fine and densely formed, the head for recording and reproducing the data is used as a target recording track. Very high accuracy is required for the positioning mechanism for positioning to.

In order to realize highly accurate positioning control in this way,
It is necessary to support a traveling body (hereinafter referred to as a carriage) that moves the head in the access direction smoothly and in a state in which movement in a direction other than the movement direction is restricted.

Therefore, as a carriage supporting mechanism for that purpose, there are, for example, those described in Japanese Patent Application Laid-Open No. 57-40785 or those disclosed in Japanese Patent Application Laid-Open No. 58-14372.

However, in the former one, the mechanism that gives the preload force to support the carriage on the rail without backlash fixes the bearing for attaching the carriage to the rail to the carriage with a cantilever structure using a leaf spring. Therefore, there is a problem that the leaf spring swings to generate vibration in the carriage.

Further, in the latter case, since a rail for guiding passes through the center of the carriage, other components such as a linear motor for reciprocating the carriage cannot be attached to the center of the carriage. there were. Further, there is also a problem that the preload force changes depending on the position of the carriage in the head access direction.

[Purpose] The present invention has been made in order to eliminate the above-mentioned disadvantages of the conventional technique, and an object of the present invention is to provide a support mechanism for a traveling body that can stably and reliably supply a preload force.

[Structure] In order to achieve this object, the present invention mounts a bearing for supplying a preload force to a traveling body by elastic mounting members whose both ends are supported.

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

1 (a), (b) and (c) show a head access mechanism according to an embodiment of the present invention.

In the figure, two round rod-shaped guide shafts 2 and 3 are arranged in parallel with a moving direction of a traveling body (hereinafter referred to as a carriage) 1 (head access direction).

In addition, one side surface 1a of the carriage 1 is formed to have a substantially mountain-shaped cross section, and the mountain-shaped sloped surface has an appropriate interval.
Bearings 4, 5 and 6 for mounting the carriage 1 on the guide shaft 2 are provided. These bearings
Among the bearings 4, 5, 6, the bearings 4, 5 are in contact with the upper surface of the guide shaft 2, the bearing 6 is in contact with the lower surface, and the guide shaft 2 is sandwiched by the bearings 4, 5 and 6. .

The other side surface 1b of the carriage 1 is formed in a substantially mountain-shaped cross section at a portion where the bearings 7 and 8 corresponding to the bearings 4 and 5 are attached, and these bearings 7 and 8 are the upper surface of the guide shaft 3. Is in contact with.

On the other hand, the bearing 9 that comes into contact with the guide shaft 3 from the side opposite to the bearings 7 and 8 is attached to the side surface 1b of the carriage 1 via a leaf spring 10 for generating a preload force.

As shown in FIG. 2, the leaf spring 10 has holes for attaching to the carriage 1 formed at both ends of a horizontal plate 10a formed in a substantially T shape, and the central portion of the horizontal plate 10a is raised. ing. Further, the vertical plate 10b extending from the center of the horizontal plate 10a is bent in correspondence with the angle at which the bearing 9 is brought into contact with the guide shaft 3, and the shaft of the bearing 9 is attached to the tip thereof.

Therefore, due to the torsional rigidity of the leaf spring 10, as shown in FIG. 3, a preload force FP acting on the guide shaft 3 is generated.

The direction in which the preload force FP acts can be set to an arbitrary position depending on the bending mode of the vertical plate 10b. Therefore, the direction in which the preload force FP acts can be set to an ideal direction, and the mounting accuracy of the bearing 9 can be improved. Can be improved. Also,
When attaching the leaf spring 10 to the carriage 1,
Since it is possible to work from the front direction, the installation is easy. The magnitude of this preload force is 10
It can be set to an appropriate value depending on the length dimension of.

In this way, the bearings 4,5,6,7,8,9 supporting the carriage 1 on the guide shafts 2,3 are
Since the leaf springs 10 that are in contact with the guide shafts 2 and 3 without backlash by the preload force generated by the preload force and that generate the preload force at both ends are fixed to the carriage 1, the leaf spring 10 The rigidity in directions other than the preload direction is extremely high, and therefore unnecessary vibration can be prevented.

As a result, the performance of the servo control mechanism for accurately positioning the carriage 1 can be significantly improved.

Now, an outline of an optical disk drive device to which this embodiment is applied is shown in FIGS. 4, 5 and 6. In these figures, the same parts as those in FIGS. 1 (a), (b) and (c) and the corresponding parts are designated by the same reference numerals and the description thereof will be omitted.

In the figure, a spindle motor 21 for driving an optical disc OD is provided at an appropriate position of a frame 20 of the optical disc drive device, and the carriage 1 is provided in correspondence with the access direction passing through the axis of the spindle motor 21. Guide shafts 2 and 3 for guiding the are arranged.

An optical pickup 22 for recording / reproducing data on / from an optical disk OD is mounted on the carriage 1, and a coil 23a, which is a component of a linear motor 23 for driving the carriage 1 in the access direction, is installed in the hollow portion thereof. Is attached.

Further, a magnet 23b, which is a component of the linear motor 23, is attached to the frame 20 at a position facing the coil 23a.

Incidentally, 24, 25, 26, 27, 28, 29 are fixing plates for fixing the guide shafts 2, 3 to the frame 20.

In this way, since the carriage 1 that moves the optical pickup 23 in the access direction of the optical disk OD is supported by the configuration of the above-described embodiment, the linear motor 23 can be configured inside the carriage 1, and therefore, The optical disk drive can be made compact.

Further, since it is possible to prevent unnecessary vibration from occurring in the carriage 1, the accuracy of tracking control for positioning the optical pickup 23 on an arbitrary recording track of the optical disc OD is improved.

By the way, the configuration of the leaf spring 10 for generating the preload force FP is not limited to that shown in the above-mentioned embodiment. For example, as shown in FIG. 7, only a vertical plate portion formed in a substantially T shape may be bent. In this example, since the leaf spring 10 'can be attached to the upper surface of the carriage 1, the attaching work can be further facilitated.

Furthermore, as shown in FIG. 8, two bearings sandwiching the same guide shaft may be attached to the leaf spring 10 ″. In this case, one end of the leaf spring 10 ″ is fixed with a screw 40,
By fixing the other end by the combination of the guide elongated hole 41 and the guide pin 42, the assembling property can be further improved.

The present invention can be applied not only to the optical disk drive device but also to a magnetic disk device or a magneto-optical disk device in the same manner.

[Effect] As described above, according to the present invention, the bearing for supplying the preload force is attached to the traveling body by the elastic attachment members whose both ends are supported. Without generating vibration
Therefore, there is an advantage that the preload force can be stably and reliably supplied.

[Brief description of drawings]

1A is a plan view showing an apparatus according to an embodiment of the present invention, FIG. 1B is a partially cutaway side view, FIG. 1C is a side view, and FIG. 2 is a leaf spring. FIG. 3 is a schematic view for explaining generation of preload force by a leaf spring, and FIG. 4 is a plan view showing an outline of an optical disk drive device to which an embodiment of the present invention is applied. 5 is a side view illustrating the internal structure of the carriage, FIG. 6 is a partial cross-sectional view illustrating the internal structure of the carriage, FIG. 7 is a perspective view illustrating another example of the leaf spring, and FIG. FIG. 9 is a perspective view showing still another example of the leaf spring. 1 …… Carriage, 2,3 …… Guide shaft, 4,5,6,7,
8,9 …… Bearing, 10,10 ′, 10 ″ …… Flat spring.

Claims (1)

[Claims] Claims: 1. Two guide shafts, which are arranged in parallel with the traveling path of the traveling body and guide the traveling body, and two guide shafts attached to the traveling body and abutting on the guide shaft from different directions, A plurality of bearings for restricting movement in a direction other than the moving direction of the elastic body, one of the plurality of bearings being disposed at a central portion of the elastic mounting member having edges formed at both ends for mounting to the traveling body. A support structure for a traveling body, which is provided and applies an urging force acting on a surface perpendicular to a moving direction to the traveling body.