JP3121367U - Stepping motor for camera drive - Google Patents

Abstract

The present invention provides a stepping motor for a camera driving device that can operate reliably and reduce production costs.
A yoke includes one base portion, two arm portions formed on both sides of the base portion, four free ends of the arm portion and four separately formed between the arm portion and the base portion. Has magnetic poles. The two coils 20 are mounted so as to cover the outer periphery of the arm part separately. The magnet 30 has a cylindrical iron core that generates magnetic poles capable of changing different polarities by being magnetized so as to form a plurality of areas along the circumferential direction, and the iron core floats under the action of magnetic force. It arrange | positions between magnetic poles so that it can rotate by this. The handle 40 is connected to the magnet 30 and can be rotated synchronously therewith and has an interlocking unit that can drive a predetermined property of the camera.
[Selection] Figure 1

Description

  The present invention relates to a stepping motor, and more particularly to a stepping motor of a camera driving device.

The principle of the stepping motor of a known camera driving device is that a magnet and a plurality of yokes having magnetic poles are combined, the magnetic field of the yoke is changed by a coil disposed on the yoke, and the magnet and the yoke are caused to react with each other. Is to operate.
However, since many of the yokes that form the magnetic field of a plurality of magnetic poles have a problem that it is difficult to grasp the precision during assembly, the accuracy of operation is affected. Further, since there are drawbacks such as a large number of parts, a long time for assembly, and a relatively high production cost, there is room for improvement in the stepping motor of the known camera drive device.

As a result of hard efforts to solve the above-mentioned drawbacks, the present inventor has completed a stepping motor for a camera driving device.
A main object of the present invention is to provide a stepping motor for a camera driving device that can achieve the object of reliable operation by simplifying the structure and increasing the precision.
Another object of the present invention is to provide a stepping motor for a camera driving device that is easy to assemble and that can achieve the purpose of reducing production costs.

  In order to achieve the above-described object, a stepping motor of a camera driving device according to the present invention includes one yoke, two coils, one magnet, and one handle. The yoke has one base portion, two arm portions formed on both sides of the base portion, and four magnetic poles separately formed between the free end of the arm portion and the arm portion and the base portion. The two coils are separately mounted on the outer periphery of the two arm portions of the yoke. The magnet consists of a cylindrical iron core that generates magnetic poles that can change different polarities by magnetizing to form a plurality of areas along the circumferential direction, and the iron core floats by receiving the movement of magnetic force It is arranged between these magnetic poles of the yoke so that it can rotate. The handle is connected to the magnet and can be rotated synchronously. As a result, the present invention not only has the advantages that the structure is simplified, the precision is high, and the assembly is easy, but it is also possible to achieve the purpose of reliably operating and reducing the cost.

The features and effects of the present invention will be described below with reference to the drawings and embodiments. First, the description of the drawings is as follows.
FIG. 1 is a perspective view after assembly of an embodiment of the present invention.
FIG. 2 is a front view after assembly of an embodiment of the present invention.
FIG. 3 is an exploded perspective view of an embodiment of the present invention.
FIG. 4 is an exploded side view of an embodiment of the present invention.

As shown in FIGS. 1 to 4, a stepping motor of a camera driving device according to an embodiment of the present invention is used for a control operation for controlling a shutter or a diaphragm of a camera, and includes one yoke, two coils, It has one magnet and one handle.
The yoke 10 is integrally molded from a metal, forms the entire body 11 in a W shape, and is formed on one opposite U-shaped base 12 and extending from both sides of the base 12 so as to be positioned on opposite sides of the base 12. And two arm portions 13. The two arm portions 13 are separately parallel to both sides of the base portion 12. Moreover, the arm part 13 has the fixed tank 14 in the bottom part outer side, and has the fixed tank 15 for fixing the main body 11 to the top outer side. Further, the base 12 has a recess 121, and two magnetic poles 16 and 17 are generated between the recess 12 and the arm 13, and the arm 13 separately generates a magnetic pole 18 and a magnetic pole 19 at the free end.

The two coils 20 are formed in advance by winding an elongated enamel wire 22 in a predetermined shape and size, and form a fitting hole 23 that is fixed so as to cover the outer periphery of the two arm portions 13 of the yoke 10. Power is supplied through the head portions 24 at both ends of the wire 22.
Further, the yoke 10 and the two coils 20 described above can constitute the coil unit 1.

  The magnet 30 has a cylindrical iron core 31, and the iron core 31 is magnetized so as to form four zones at the same interval along the circumferential direction, that is, a magnetic pole that can be switched between different polarities, that is, an N pole and an S pole. Generate poles. The magnet 30 has a pivot hole 32 formed along the axis of the iron core 31 and a positioning hole 35 positioned on the end surface of the iron core 31. Further, the magnet 30 is kept floating so as to be positioned between the magnetic pole 16, the magnetic pole 17, the magnetic pole 18, and the magnetic pole 19 by the magnetic force of the iron core 31.

The handle 40 includes a pivot 41 having a slight rib-like locking portion 42 inserted into the pivot hole 32 of the magnet 30, a plate 43 connected to the pivot 41, and a plate 43 so as to be positioned on the same plane as the pivot 41. And a positioning portion 45 that is inserted into the positioning hole 35 of the magnet 30 and an interlocking portion 47 that is formed on the other surface of the plate 43 and deviates from the pivot 41.
Further, the magnet 30 and the handle 40 described above can constitute the crankset 4.

Hereinafter, the operation and function of the present embodiment will be described.
The crankset 4 is wound from the coil set 1, and the coil set 1 can maintain the balance of the receiving force together with the magnet 30 of the crankset 4 via the magnetic force of the magnetic pole 16, the magnetic pole 17, the magnetic pole 18 and the magnetic pole 19 of the yoke 10. maintain. Further, the coil set 1 and the crank set 4 are not in contact with each other, and the magnet 30 of the crank set 4 can rotate along the axis of rotation.

  When the coil 20 is energized through the head portion 24, the coil 20 generates a sensitive potential and can change the magnetism of the magnetic pole 16, the magnetic pole 17, the magnetic pole 18, and the magnetic pole 19 of the yoke 10. Since the magnet 30 is affected by changes in the surrounding magnetic field, and the magnet 30 of the crankset 4 cannot balance the receiving force, it is rotated along the axis of the magnet 30 of the crankset 40 at the same time. The interlocking portion 47 of the handle 40 is moved along the magnet 30 of the crank set 40.

  In the above-described embodiment, the magnetic pole 16, the magnetic pole 17, the magnetic pole 18, and the magnetic pole 19 are integrally formed on the yoke 10, the relative positions and dimensions are relatively reliable, and the material properties are relatively consistent. It is possible to further ensure the rotational operation of the magnet 30 due to the magnetic properties. In addition, since the magnet 30 and the handle 40 rotate while facing each other in the center, a stable and reliable effect can be achieved, the interlocking operation is further ensured.

As described above, the advantages of the present invention are as follows.
1. Since the yoke is integrally molded and the accuracy and certainty of the magnetic field of the magnetic poles generated by the yoke are higher than those known, the stepping motor of the camera drive device according to the present invention can achieve reliable operation. Is possible.
2. Since the structure after the combination is simplified, the number of parts is less than the known ones, and the assembly is easy, the stepping motor of the camera drive device according to the present invention saves labor and materials during production and reduces the production cost. Can be realized.

1 is a perspective view illustrating a stepping motor of a camera driving device according to an embodiment of the present invention. 1 is a front view illustrating a stepping motor of a camera driving device according to an embodiment of the present invention. 1 is an exploded perspective view illustrating a stepping motor of a camera driving device according to an embodiment of the present invention. 1 is an exploded side view illustrating a stepping motor of a camera driving device according to an embodiment of the present invention.

Explanation of symbols

  1 Coil unit, 4 Crankset, 10 Yoke, 11 Body, 12 Base, 13 Arm, 14 Fixed tank, 15 Fixed tank, 16 Magnetic pole, 17 Magnetic pole, 18 Magnetic pole, 19 Magnetic pole, 20 Coil, 22 Enamel wire, 23 Fitting Joint hole, 24 head part, 30 magnet, 31 iron core, 32 pivot hole, 35 positioning hole, 40 handle, 41 pivot, 42 locking part, 43 plate, 45 positioning part, 47 interlocking part, 121 recess

Claims (4)

A yoke having one base, two arm portions formed on both sides of the base portion, and a free end of the arm portion and four magnetic poles separately formed between the arm portion and the base portion;
Two coils mounted so as to cover the outer periphery of the two arm portions of the yoke separately;
It has a cylindrical iron core that generates magnetic poles that can change different polarities by magnetizing to form multiple areas along the circumferential direction, and the iron core can rotate by floating under the action of magnetic force A magnet disposed between the magnetic poles of the yoke so that
A handle having an interlocking portion that is connected to a magnet and can be rotated synchronously and can drive a predetermined property of the camera,
A stepping motor for a camera driving device.   2. The stepping motor for a camera driving device according to claim 1, wherein the two magnetic poles positioned at the base of the yoke are formed by being divided by a concave tank.   2. The stepping motor for a camera driving device according to claim 1, wherein the yoke has a slight fixing tank formed outside the yoke and fixing the yoke to a predetermined part of the camera.   2. The stepping motor for a camera driving device according to claim 1, wherein the coil has a fitting hole that is wound and molded in advance and is fixed so as to cover the arm portion of the yoke.

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