JPS62104470A - Plate-formed linear pulse motor - Google Patents

Abstract

PURPOSE:To miniaturize a magnetic head driving gear and realize cost reduction, by setting a detection mechanism for detecting the position of the original point of a mover, between a stator and the mover. CONSTITUTION:A detection mechanism 3 is set on the upper surface of the salient section 12a of the back yoke 12 of a stator 1, and by the detection mechanism 3, the position of an original point is detected directly through the end section of a mover 2 or the like. The detection mechanism 3 is organized with a set of a light-projecting element 32, a light-receiving element 33 forming a pair with respect to a housing 31, and a reflecting mirror 34 between them, confronting the housing 31 set at a core-projecting section 12a. The end section of the mover 2, namely, the position of the original point is detected based on the output of the light-receiving element 33.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a flat linear pulse motor applied to, for example, a magnetic head drive device for a floppy disk of a word processor.

<Summary of the Invention> The present invention provides a linear mover comprising a stator having a four-phase magnetic pole tooth row arranged on its upper surface, and a linear mover having a magnetic pole tooth row opposing the four-phase magnetic pole tooth row arranged on its lower surface. In the pulse motor, a mechanism for detecting the origin position of the movable element is provided between the stator and the movable element, thereby realizing miniaturization and cost reduction of the magnetic head drive device.

<Background of the Invention> Conventionally, this type of magnetic head drive device has a feed screw 41 formed on the rotating shaft of a rotary pulse motor 4, as shown in FIG. A screw hole 52 is formed in the support plate 5 supported by the guide 51,
The feed screw 41 is screwed into the screw hole 52 to convert the rotation of the pulse motor 4 into linear movement of the magnetic head 6. However, in this device, in order to determine the relative position of the magnetic head 6 and the front disk drive 7, a light shielding plate 53 is attached to a part of the magnetic head support plate 5 (N
A photosensor unit 8 is disposed in the path of the light-shielding plate 53, and by adjusting the light-shielding position, the outermost track G of the floppy disk 7, which is the origin position of the pulse motor 4, is set. In this home position alignment, after all the pulse smoke 4, magnetic head support plate 5, etc. are assembled into the device, it is necessary to adjust the position of the photosensor unisoto 8 while looking directly at the signal from the diskette. Setting up this ali v5 is complicated and takes time. Moreover, Fumetosenza Unisoto 8 uses a commercially available ready-made Unisoto, which has a large outer diameter and costs 1f.
This is one of the reasons why the equipment becomes larger and more expensive.

In addition, a proposal was made to apply a direct-acting flat plate linear pulse motor to such a magnetic head drive device (Japanese Patent Laid-Open No. 59-89
No. 565), but this flat linear pulse motor also uses the same mechanism as the above example to detect the origin position, and does not have the same disadvantages as the previous example in terms of origin position alignment.

<Object of the invention> The present invention solves the conventional problems by providing a mechanism for detecting the origin position of the mover between the stator and the mover.
The purpose of the present invention is to provide a new flat linear pulse motor that can simplify the work of aligning the origin, reduce the size of the device, and reduce costs.

<Configuration and Effects of the Invention> In order to achieve the above object, the present invention includes a stator having a four-phase magnetic pole tooth row arranged on the upper surface, and a magnetic pole tooth row opposing the four-phase magnetic pole tooth row on the lower surface. In a flat linear pulse motor consisting of a mover with A detection mechanism consisting of a reflecting mirror that projects an image onto the surface is provided. According to the above configuration, in this invention, in particular, the entire light projecting element, light receiving element, and reflecting mirror forming the detection mechanism are incorporated into the stator, and the origin position is detected by detecting the end of the movable element, etc. As a result, it has two practical effects that can reduce the size and cost of the floppy head drive device.

<Description of Embodiments> FIG. 1 shows a flat linear pulse motor according to the present invention.

The linear pulse motor consists of a stator 1 and a mover 2 slidably supported by the stator 1, and the stator 1 includes:
A pack yoke 12 of the same width is attached to the bottom surface of a flat permanent magnet 11 having an appropriate width and length, and a 0:1 section (') is placed in front of it.
1 protruding and l゛ζ are integrally connected and arranged. On the two sides of the permanent magnet 11, there are yokes 13 arranged in pairs on the front, back, left and right sides.
The outer parts are made to protrude from both sides of the magnet 11, and the inner end faces are opposed to each other and are integrally connected. A pair of rectangular rod-shaped magnetic cores 15a and 15b are arranged in series, and a magnetic pole tooth row 13a to 13 is provided on the upper surface of each yoke 13 corresponding to the permanent magnet 11.
d.

The four-phase magnetic pole tooth rows 132 to 13d are shifted in phase in the longitudinal direction of the permanent magnet, that is, in the moving direction of the moving element. Guides 16 parallel to each other are attached to the upper surface of the yoke 13 corresponding to the magnetic cores], 5a, and 15b, and the movable element 2 is slidably supported.

The mover 2 has a magnetic pole tooth row 32 corresponding to the magnetic pole tooth rows 13a to 13d of the stator 1 on the lower surface of a flat main body 21, and guide surfaces 23 with right-angled cross sections on both side edges.
is supported on the guide 16 of the stator 1, and a magnetic gap in microns is set between the magnetic pole tooth rows 13a to 13d of the stator 1 and the magnetic pole tooth row 22 of the mover 2.

In the present invention, a detection mechanism 3 is disposed on the upper surface of the protrusion 12a of the back yoke 12 in the stator 1, and the detection mechanism 3
It is characterized in that the origin position is directly detected from the end of the mover 2. The detection mechanism 3 includes a light emitting element 3 that forms a pair with respect to a housing 31 disposed on the core protrusion 12a.
2, a light receiving element 33, and two symmetrically inclined reflecting surfaces 34a, 34++ therebetween, and a reflecting mirror 34 is provided for projection.
A light-receiving element unit is configured, and the projected light from the light-emitting element 32 is reflected in one direction from one reflecting surface 34a, and the reflected light from the movement r-2 is reflected from the other reflecting surface 34b toward the light-receiving element 33 side. The output of the light receiving element 33 is reflected to the Schmitt circuit 35 shown in FIG.
F control, O:;; section, l! of mover 2. lI”:> Detects the origin position.

FIG. 5 shows another embodiment of the stator 1 in a flat linear pulse motor. In this embodiment, a square bar-shaped permanent magnet 11
A four-phase magnetic pole tooth row 13a is provided on the upper surface of each magnetic pole surface on both sides of the magnetic pole surface.
- 13d are integrally connected, and the front and rear parts of each yoke 13 are provided with mounting pieces 17 that project parallel to each other forward and backward, and between the left and right mounting pieces 17, excitation coils 14a, 14b are connected. A pair of magnetic cores 1.5a wound with
, 15b are arranged in series, guides 16 are connected and arranged on both sides of the permanent magnet 11 and the yoke 13, and a pair of bolts are formed between the left and right mounting pieces 17 on the housing 31 as in the previous example.

A detection mechanism 3 having a reflecting mirror 34 is provided between the light receiving elements 32 and 33.

6 to 8 show another embodiment of the reflecting mirror 34 in the detection mechanism 3. In this embodiment, two symmetrically inclined reflecting surfaces 34a and 34b between the pixel elements 32 and 33 are connected to the movable member. When the ends of the stator 1 and the mover 2 coincide with each other, the projected light from the light projecting element 32 is tilted low and symmetrically on the side corresponding to the rear in the direction of movement of the light emitting element 32. 34a, the moving element 2, the reflecting surface 34b, and the light receiving element 33, so that the length of the moving element 2 can be minimized.

In each of the above embodiments, the reflecting mirror 34 in the detection mechanism 3 has a housing member plated, in addition to a glass mirror plate.
A mirror surface can be formed by vapor deposition or other chemical treatment, and the origin detection position of the slider 2 is not limited to the end of the slider 2, but a detection mark may be applied to the lower surface of the slider as necessary. ,
Of course, you can choose to do so.

However, in the present invention, a support member (not shown) is provided at the front end of the mover 2 to attach the magnetic head. In the detection mechanism 3, the projected light from the light projecting element 32 is reflected upward from one reflecting surface 34a of the corresponding reflecting mirror 34, reflected downward by the magnetic pole tooth row 22 of the mover 2, and reflected from the other reflecting surface 34a. It is reflected on the reflective surface 34b and acts on the light receiving element 33 (Fig. 2),
Detected. When mover 2 moves to the stroke end,
The projected light from the light emitting element 32 is diffused upward, and the light emitted from the light receiving element 3
The output of the light receiving element 33 is ON-OFF controlled through a Schmitt circuit 35, and the origin position of the moving element 2 is detected and determined.

In addition, in the operation of the linear pulse motor, by passing a current through the coil 14a, magnetic flux is generated in the magnetic pole tooth row 13a in a direction that strengthens the bias magnetic flux caused by the permanent magnet 11 and in the magnetic pole tooth row 13b in a direction that weakens each other. The magnetic pole tooth row 22 of the stator 1 and the magnetic pole tooth row 13a of the stator 1 are stabilized in a opposed state, and then when the current in the coil 1.4H is cut off and the current is passed through the coil 14b, the permanent magnet 11 is turned off in the magnetic pole tooth 13d. The bias magnetic fluxes of the magnetic pole teeth are strengthened, and magnetic fluxes are generated in the direction of weakening each other in the magnetic pole tooth row 13C, and the magnetic pole tooth row 22 of the mover 2 and the magnetic pole tooth row 13d of the stator 1 face each other and become stable. Similarly, coil 14a
By passing a current in the opposite direction through the coils 14, 2, the magnetic pole tooth row 22 of the mover 2 and the magnetic pole tooth row 13b of the stator 1 are stabilized as they face each other. When a current in the opposite direction is passed through b, the magnetic pole tooth row 22 of the mover 2 and the magnetic pole tooth row 13C of the stator 1 face each other and become stable. In the magnetic pole tooth rows 13a to 13d of the stator 1, the magnetic pole tooth rows 13a and 13b and 13c and 13d have a magnetic pole tooth pitch of 172, and the magnetic pole tooth rows 13a and 13C have a 1/4 pitch phase difference, so the above-mentioned In operation, mover 2 is 1/4
Move in a pinch.

As described above, the present invention provides four-phase magnetic pole tooth rows 13a to 1 on the upper surface.
3d, and a slider 2, which has a magnetic pole tooth row 22 facing this magnetic pole tooth row on the lower surface. A detection mechanism 3 having a light emitting element 32, a light receiving element 33, and a reflecting mirror 34 therebetween is arranged, and the origin position of the mover 2 is detected by this detection mechanism 3, so that the present invention is particularly advantageous in light emitting. element 32, reflecting mirror 34, and light receiving element 33
By using small elements, the linear pulse motor itself can have an origin position detection mechanism built-in.
Therefore, it is possible to miniaturize the magnetic head drive device, and furthermore, it is possible to realize a significant cost reduction, which has the effect of achieving the purpose of the invention by simplifying the structure.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of the flat linear pulse motor according to the present invention, Fig. 2 is a front view showing the main parts in cross section, Fig. 3 is an oblique view of the detection mechanism, and Fig. 4 is Fig. 3 IV. -IV line sectional view, FIG. 5 is a perspective view showing another embodiment, FIG. 6 is a side view showing another example of the detection mechanism, FIG. 7 is a perspective view of FIG. 6, and FIG. 8 is a perspective view showing another example of the detection mechanism. FIG. 7 is a sectional view taken along the line ■-■, FIG. 9 is a circuit diagram used in the detection mechanism, and FIG. 10 is a perspective view of a conventional example. 1... Stator 13a-13d... Magnetic pole tooth row 2... Mover 22... Magnetic pole tooth row 3...
... Origin detection mechanism 31 ... Housing 32 ... Light emitting element 33 ...
... Light receiving element 34 ... Reflecting mirror 34a, 34
b...Reflective surface patent Applicant: Tateishi Electric Co., Ltd. Helicopter Mortar, 〒-IHY'iI 3〒〒-IHY'iI 3〒7〒-〒-〒-〒-〒-〒-IHY'iI〒〒-〒-IHY'iI 3〒〒7〒-〒-〒-〒-〒-IHY'iI 3〇〒7〒-〒-〒-〒-〒-IHY'iI 3〇〒7〒-〒-〒-〒-IHY'iI 3〇〒7 figure

Claims (2)

[Claims] (1) A stator with a 4-phase magnetic pole tooth row arranged on its upper surface, and a mover disposed on the stator and with a magnetic pole tooth row facing the 4-phase magnetic pole tooth row on its lower surface. 1. A flat linear pulse motor characterized in that a detection mechanism for detecting the origin position of the moving element is provided between the stator and the moving element. (2) In the origin position detection mechanism, a light emitting element and a light receiving element are arranged facing each other on a stator, and between them, the projected light of the light emitting element is reflected to the movable element, and the reflected light from the movable element is reflected to the light receiving element. 2. A flat linear pulse motor according to claim 1, wherein a reflecting mirror is provided.