JPH042461Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a head drive mechanism of a magnetic disk recording/reproducing device such as an electronic camera.

(Prior Art) As a means for parallelly scanning a head frame on which a magnetic head for recording and reproducing signals for recording and reproducing signals on a magnetic disk is mounted with high precision using a guide member, a technique as shown in FIG. It is disclosed in Publication No. 205957.

In this technique, the main shaft 2 and the auxiliary shaft 3 are used as guide members to scan the head 1 in the X direction. The following means are taken to absorb the mounting error between the two axes, which should be parallel.

That is, the main shaft 2 is slidably fitted into the head 1, the auxiliary shaft 3 is slidably fitted by the piston 4, and the piston 4 is fitted into the main shaft 2.
It is set so that it can slide in the groove 5 in the direction Y perpendicular to the direction Y.

In this way, even if an error occurs in the parallelism with the main shaft 2 when attaching the auxiliary shaft 3, the change in distance between the two shafts will be absorbed by the sliding movement of the piston 4. As a result, head 1 can be installed without requiring any special adjustment when installing the shaft.
This means that parallel scanning can be performed with high precision.

(Problems to be solved by the invention) However, the above-mentioned conventional technology has the following problems.

This is because there are a relatively large number of fitting parts that affect the positional accuracy of the head 1, and from this point of view, this is an impediment to improving the positional accuracy of the head.

That is, in the above configuration, the head 1 of the main shaft 2
At least three fitting parts are required: a fitting part for the piston 4 of the auxiliary shaft 3, a fitting part for the piston 4 of the auxiliary shaft 3, and a fitting part for the groove 5 of the piston 4. The sum of these differences affects the head position accuracy. Furthermore, since there are many fitting parts, sliding resistance increases, leading to problems in driving energy and durability.

(Means for solving the problem) Therefore, the purpose of the present invention is to reduce the number of fitting parts as much as possible by simple means, to ensure positional accuracy during head scanning, and to reduce frictional resistance for head movement. It is an object of the present invention to provide a head drive mechanism for a magnetic disk recording/reproducing device that can improve durability and reduce drive energy at a minimum.

In accordance with the purpose of the present invention, a slide guide surface is formed on the side opposite to the guide member for the magnetic head of the head frame, and the inner ring of the head frame is attached to a fixed shaft fixed to the main body so as to be perpendicular to the disk surface. A head drive mechanism is provided in which the outer ring of at least one ball bearing fitted with the ball bearing is preloaded in the axial direction of a fixed shaft by a preload urging means and brought into contact with the fixed shaft.

(Function) In this invention, instead of supporting through fitting,
It is supported under pressure by rotating means using ball bearings.

(Example) Example 1 (see Figures 1 to 3) In the figure, reference numeral 10 indicates a magnetic head, approximately L
It is attached to a head frame 11 consisting of a letter-shaped block. One end of the head frame 11 is fitted into a main guide shaft 12 as a guide member at two positions in the longitudinal direction of the shaft. Reference numerals 11a and 11b each indicate a bearing of this fitting portion.

Regarding the head frame, slide guide surfaces 11c and 11d are formed parallel to the main guide shaft 12 and have a constant thickness on the side opposite to the fitting portion.
There is. Moreover, these slide guide surfaces 11c, 1
A fixed shaft 13 is installed in the main body 14 perpendicularly to 1d.

A ball bearing 15 is attached to the fixed shaft 13, and a portion of an outer ring 15a rotatable with respect to the fixed shaft 13 is positioned to cover the slide guide surface 11c.

A sleeve 16 having a flange 16a is fitted onto the fixed shaft 13, and an extensible coil spring 17 serving as a preload biasing means is wound around the sleeve 16. Here, the flange 16a is also connected to the outer ring 1.
5a, the elastic force of this coil spring 17 is applied to the main body 14 and the flange 16a.
acting between the outer ring 1 and the slide guide surface 11c.
5a, the slide guide surface 11d is attached to the flange 16.
energize them so that they come into close contact with each other.

However, the slide guide surfaces 11c and 11d are slidable in the Y direction orthogonal to the X direction.
In addition to biasing the slide guide surface, the coil spring 17 also functions as a preload spring for the ball bearing 15, contributing to reducing bearing fluctuations in the Z direction that are involved in vertical fluctuations of the head 10. ing.

With this structure, the head frame 11 is supported by one fitting portion between the head frame 11 and the main guide shaft 12.

The head frame is assembled using bolts and screws installed on the rotating shaft of the stepping motor (not shown).
The slide guide surface is slidably supported in the Y direction, and is movable in the X direction by the function of the ball bearing 15.

In this example, if the fitting part between the sleeve 16 and the fixed shaft 13 does not have a certain length,
Care must be taken, as the so-called ``twiddling'' phenomenon may occur and the movement will not be smooth.

When a ball bearing having a large flange-shaped portion that receives the slide guide surface can be used, it is possible to use a configuration in which such ball bearings are placed facing each other, as in the following embodiment.

Embodiment 2 (See Figure 4) In this example, a ball bearing 15' is used in place of the sleeve 16 in the above example, and the slide guide surface 11d of the outer ring 15'a is connected to a coil as a preload biasing means. It is pressed by a spring 17'.

In this example, in consideration of the above-mentioned "twisting phenomenon", the fixed shaft 1 of the ball bearing 15' is
It is also necessary that a certain length be taken in the longitudinal direction of the axis of No. 3. A feature of this example is a further reduction in sliding resistance.

(Effects) In the present invention, since there are few fitting parts that affect head positioning accuracy, highly accurate scanning is possible.
Furthermore, since the slide guide surface is supported by a preloaded ball bearing, sliding resistance is reduced, which is advantageous in that durability and drive energy efficiency can be improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the head drive mechanism according to the present invention, Fig. 2 is a plan view of the above figure, Fig. 3 is a side sectional view of the same figure, and Fig. 4 is a head drive mechanism illustrating a modified embodiment. FIG. 5 is a sectional view of a main part, and FIG. 5 is a perspective view of a main part of a parallel scanning means according to the prior art. 10... Magnetic head, 11... Head frame, 11c, 11d... Slide guide surface, 14
...Body, 15...Ball bearing, 17,1
7'...Coil spring.

Claims (1)

[Claims for Utility Model Registration] A head drive mechanism for a magnetic disk recording/reproducing device in which a head frame on which a magnetic head for recording and reproducing signals on a magnetic disk is mounted is moved by regulating the direction of movement by a guide member. A slide guide surface is formed on the opposite side of the guide member to the magnetic head of the head frame, and the inner ring is fitted onto the slide guide surface onto a fixed shaft fixed to the main body so as to be perpendicular to the disk surface. 1. A head drive mechanism for a magnetic disk recording/reproducing device, characterized in that the outer ring of at least one ball bearing is preloaded and brought into contact with a fixed shaft in the axial direction by a preload urging means.