JPH0528940Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a linear drive device for linearly moving a magnetic head, an optical head, etc., which is used in a magnetic disk device, an optical disk device, etc.

BACKGROUND ART FIGS. 3 and 4 show the configuration of a conventional linear drive device. In Figures 3 and 4, 3
1 is a center yoke, 32 is a pair of side yokes provided on the sides of the center yoke 31, and 33 is a spacer interposed between both ends of the center yoke 31 and each side yoke 32 for providing a magnetic gap 34. . 35 is a coil wound around the center yoke 31 and physically coupled to a movable object such as a magnetic head (not shown); 36 is a side yoke 32;
A magnet 37 is fixed to the surface on the center yoke 31 side of the center yoke 31 and the side yoke 32.
These screws are used to secure the spacer 33 at two locations, one between each end of the spacer 33, and the other end of the spacer 33, respectively.

To assemble this linear drive, coil 35
is inserted into the center yoke 31, the spacer 33 and the magnet 36 are glued to the side yoke 32, and the side yoke 32 and spacer 33 are screwed together
7 to fix it to the center yoke 31.

By passing current through the coil 35, the movable object can be moved linearly.

Problems to be solved by the invention However, in the above conventional linear drive device,
With the screw 37 retracted into the screw holes of the side yokes 32 and spacer 33, the screws 37 and the screw holes of the center yoke 31 must be positioned, and this positioning is difficult. Further, there was a problem that it took time to rotate the screw 37, that is, to assemble the screw 37.

The present invention aims to solve these conventional problems and to provide a linear drive device that can be assembled easily and in a short time.

Means for Solving the Problems The technical means of the present invention for solving the above problems consists of a center yoke wound with a coil that is physically connected to a movable object, and a center yoke on the side of the center yoke. a side yoke provided with a magnet on its surface and provided on the side of the center yoke; a spacer interposed between the center yoke and the side yoke to provide a magnetic gap; and the spacer, the side yoke, and the center yoke. and at least one of the holes formed in the spacer, the side yoke, and the center yoke to fix the spacer to the area where the hole is provided, and then fit into the other hole to fix the spacer. , a positioning pin for positioning the side yokes and the center yoke, and the center yoke, the spacer, and the side yokes are fixed by the attraction force of the magnet.

Therefore, according to the present invention, the spacer, the side yokes, and the center yoke can be easily positioned using the positioning pins, and the assembly can be performed by fitting the positioning pins and holes, thereby reducing the assembly work. It can save time.

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

1 and 2 show an embodiment of the present invention, with FIG. 1 being a plan view and FIG. 2 being a front view. In Figures 1 and 2, 1 is the center yoke, 2
A pair of side yokes are provided on the sides of the center yoke 1, and a spacer 3 is interposed between both ends of the center yoke 1 and each side yoke 2 to provide a magnetic gap 4. 5 is a movable object (not shown) wrapped around the center yoke 1, such as a magnetic head.
6 is a magnet fixed to the surface of the side yoke 2 on the side of the center yoke 1 by adhesive or other means; 7, 8, and 9 are attached to the spacer 3, the side yoke 2, and the center yoke 1, respectively. Holes formed to communicate at two locations, 1
0 is a positioning pin that positions the spacer 3, side yoke 2, and center yoke 1 using these holes 7, 8, and 9.

Next, the assembly order of the linear drive device will be explained. In advance, a coil 5 is wound around the center yoke 1, a magnet 6 is fixed to the side yoke 2, a positioning pin 10 made of a spring pin or the like is press-fitted into the hole 7 of the spacer 3, and then fixed to the spacer 3. put. Then, one protrusion of the positioning pin 10 is fitted into the hole 9 of the center yoke 1. Next, the other protrusion of the positioning pin 10 is fitted into the hole 8 of the side yoke. This fitting operation is performed on both sides of the center yoke 1. In this assembled state, the center yoke 1, spacer 3, and side yoke 2 are attached to the magnet 6.
It is fixed by the suction force of. This adsorption force is several
Kg, and can be strongly fixed without using screws like conventional methods. Of course, positioning pin 1
If there is no 0, the yokes 1, 2 and the spacer 3 can be easily removed by relatively shifting them.

As described above, according to the above embodiment, the relative positions of the yokes 1, 2 and the spacer 3 can be easily determined by the positioning pin 10, and the yokes 1, 2 and the spacer 3 can be easily determined by the attraction force of the magnet 6. can be firmly fixed. Further, since the assembly can be performed by fitting the positioning pin 10 into the holes 8 and 9, the assembly can be completed in a short time.

Note that by providing the spacer 3 and the side yoke 2 as one body, fixing the positioning pin 10 in these holes 7 and 8, and fitting the protrusion of the positioning pin 10 into the hole 9 of the center yoke 1, the above-mentioned result can be achieved. The same effects as in the embodiment can be expected, and in this case, since the spacer 3 and the side yoke 2 are stably fixed, it is also possible to reduce the number of positioning pins 10. After fitting the coil 5 to the center yoke 1, one end of the positioning pin 10 is fixed to the hole 9 of the center yoke 1, and the spacer 3 and the holes 7 and 8 of the side yoke 2 are attached to the protrusion of the positioning pin 10. Alternatively, the positioning pin 10 may be fitted into the holes 9, 7, and 8 of the center yoke 1, spacer 3, and side yoke 2.

Effects of the invention As described above, according to the invention, the spacer,
Holes formed in the side yokes and center yokes are positioned using positioning pins, and the center yokes, spacers, and side yokes are fixed by the attraction force of the magnets, so the relative positions of the yokes and spacers can be easily determined. Moreover, since the assembly can be performed by fitting the positioning pin and the hole, the assembly time can be shortened.

[Brief explanation of the drawing]

1 and 2 show a linear drive device according to an embodiment of the present invention, FIG. 1 is a plan view, FIG. 2 is a front view, and FIGS. 3 and 4 show a conventional linear drive device, FIG. 3 is a plan view, and FIG. 4 is a front view. 1...Center yoke, 2...Side yoke, 3
... Spacer, 4 ... Magnetic gap, 5 ... Coil, 6 ... Magnet, 7, 8, 9 ... Hole, 10 ... Positioning pin.

Claims (1)

[Claims for Utility Model Registration] (1) A center yoke wound with a coil that is physically connected to a movable object, and a magnet provided on the side of the center yoke, and a magnet provided on the side of the center yoke. a spacer interposed between the center yoke and the side yokes for providing a magnetic gap; holes formed in the spacer, the side yokes, and the center yoke; and the spacer, the side yokes, and the center yoke. and a positioning pin that positions the spacer, side yokes, and center yoke by fitting into at least one of the holes formed in the hole and fixing the spacer to the part provided with the hole, and then fitting into another hole to position the spacer, the side yoke, and the center yoke. A linear drive device characterized in that a yoke, a spacer, and a side yoke are fixed by the attraction force of a magnet. (2) The linear drive device according to claim 1, wherein an intermediate portion of the positioning pin is fixed to a hole in a spacer, and both ends of the positioning pin are fitted into holes in a center yoke and a side yoke. (3) The middle part and one end of the locating pin are fixed to the holes in the spacer and the side yoke, and the other end of the locating pin is fitted into the hole in the center yoke.Claim 1 of Utility Model Registration Linear drive device as described in section. (4) The linear drive according to claim 1, wherein one end of the positioning pin is fixed to a hole in the center yoke, and the protrusion of the positioning pin is fitted into the spacer and the hole in the side yoke. Device.