JP2007244152A - Motor and driving unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which can be reduced in plane area and miniaturized, and to provide a driving unit. <P>SOLUTION: The motor 1 is provide with a stator 2, made of a magnetic material, a rotor 3, having a magnet 31 and a rotor metal 32, a coil 4, having a winding core 41 made of a magnetic material and a coil wire 42 wound around the coil winding core 41, and a wheel row 5, including the rotor metal 31 and an output shaft 6. The coil winding core 41 is formed of two bodies, and at least one part of the wheel row 5 is arranged so as to be superimposed planarly on the coil 4 and separated in terms of the cross sections. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a motor and a drive unit, and in particular, a motor including a train wheel including a rotor kana and an output shaft, wherein at least a part of the train wheel overlaps with a coil in a plan view and is separated in cross section. In particular, the present invention relates to a motor and a drive unit that can be reduced in size by reducing the plane area by disposing a train wheel.

Conventionally, step motors have been widely used in optical zoom lens mechanisms, optical lens focus mechanisms, and the like in combination with optical lens drive units.
In recent years, with the widespread use of mobile phones having a zoom lens mechanism, the demand for optical lens driving units has also increased.
Since the above step motor and optical lens drive unit are mounted on small electronic devices such as mobile phones, various technologies have been developed to meet the demands of miniaturization, thinning, weight reduction, high output, etc. I came.

(Conventional example)
For example, Patent Document 1 discloses a small drive means including a two-pole step motor, a torque increasing gear train, and a rotation output shaft, and a two-pole step motor, a reduction gear train, and a reduction gear train. A technology of an optical lens driving device including a conversion unit that converts to linear movement and an optical lens that moves by the conversion unit is disclosed.
According to the small driving means and the optical lens driving device, it is possible to reduce the thickness and power of the entire driving device and to provide a miniaturized optical lens driving device.
JP 2004-364490 A

  However, the small-sized drive device and the optical lens drive device according to the conventional example are arranged so that the torque increasing gear train overlaps the coil in section and is separated from the plane, thereby reducing the plane area and reducing the size. It was not enough to meet the demands for the

  The present invention has been proposed in order to solve the problems of the conventional techniques as described above, and an object of the present invention is to provide a motor and a drive unit that can be reduced in size and reduced in size.

In order to achieve the above object, a motor of the present invention includes a stator made of a magnetic material, a rotor having a magnet and a rotor kana, a coil core made of a magnetic material, and a coil having a coil wire wound around the coil core. , A motor including a train wheel including the rotor kana and an output shaft, wherein the coil core is formed of two bodies, and at least a part of the train wheel overlaps the coil in a plane, And it arrange | positions so that it may leave | separate in cross section.
If it does in this way, the plane area of a motor can be reduced and a motor can be reduced in size.

In the motor according to the present invention, the coil cores are disposed to face each other.
If it does in this way, since a coil core is normally arranged symmetrically, the coil core used by two bodies can be shared, and cost reduction of a manufacturing cost can be aimed at.

Further, in the motor of the present invention, the winding portion of the coil core is rod-shaped, the winding portions of the coil core are arranged in parallel, and the train wheel is planarly arranged on the coil. It is arranged between the two.
If it does in this way, it will become possible to arrange | position each component with high density, and the width | variety of a motor can be narrowed.

In the motor of the present invention, the wheel train has at least one intermediate wheel between the rotor kana and the output shaft.
In this way, speed adjustment (for example, acceleration and deceleration) or torque adjustment can be easily performed.

In the motor according to the present invention, the intermediate wheel is composed of a gear and a pinion.
If it does in this way, a structure can be simplified and also the cost reduction of a manufacturing cost can be aimed at by forming a gearwheel and a kana integrally.

In the motor of the present invention, the train wheel is supported by a base plate and a train wheel bridge, and the coil and the stator are disposed on the opposite side of the train wheel with the base plate interposed therebetween.
In this way, the shaft support distance (bearing span) of the rotor kana, intermediate shaft, output shaft, etc. constituting the train wheel can be shortened, and the length of each shaft can be shortened, so mechanical strength, operational reliability, Productivity in assembly can be improved. Moreover, the freedom degree of wheel train arrangement | positioning can be raised.

In the motor according to the present invention, the substrate has a rectangular shape, and the coil is disposed on an edge of a long side of the substrate.
In this way, the motor can be further reduced in size.

In the motor according to the present invention, a post is erected on the substrate, and the positioning portion of the stator and / or the coil engaged with the post has a notch shape.
In this way, compared with the case of forming a hole for inserting into the post, it is possible to make a shape with a part of the outer peripheral portion of the hole being chipped, the motor can be downsized, and the positioning portion can be It can be formed easily.

In the motor of the present invention, the train wheel is supported by the stator and the train wheel bridge, and the coil is disposed on the opposite side of the train wheel with the stator interposed therebetween.
In this way, the number of parts can be reduced, the manufacturing cost can be reduced, and the motor can be made thinner. In addition, since the shaft support distance (bearing span) of the rotor kana, intermediate shaft, output shaft, etc. that make up the train wheel is shortened and each shaft length can be shortened, mechanical strength, operational reliability, and production in assembly Etc. can be improved.

In the motor according to the present invention, a post is mounted on the train wheel bridge, and the positioning portion of the stator and / or the coil engaged with the post has a notch shape.
In this way, compared with the case of forming a hole for inserting into the post, it is possible to make a shape with a part of the outer peripheral portion of the hole being chipped, the motor can be downsized, and the positioning portion can be It can be formed easily.

In order to achieve the above object, a drive unit according to the present invention comprises a motor according to any one of claims 1 to 10 and a motion conversion means for converting the rotational motion of the motor into another motion. It is as.
In this way, it is possible to reduce the size of the drive unit and to provide other motions other than rotational motion, such as linear motion, reciprocating motion, swing motion, and periodic motion.

In the drive unit according to the present invention, the motion conversion means includes a transmission member and a driven member.
In this way, the configuration is simplified, and the manufacturing cost can be reduced.

In the drive unit of the present invention, the transmission member is a cam, and the driven member is a cam follower.
In this way, the rotational movement of the motor can be easily converted into a reciprocating movement or a swinging movement.
The motion conversion means is not limited to a cam and a cam follower, and for example, a motion conversion means using a rack and pinion or a link mechanism may be used.

In the drive unit of the present invention, a gear is formed on the output shaft of the motor, and the cam is formed on a part of the gear.
If it does in this way, the gear can have the function of a cam, and by sharing parts, the number of parts can be reduced and the cost of manufacturing can be reduced.

In the drive unit of the present invention, the cam formed on a part of the gear of the output shaft is formed in a range in which the angle with respect to the center of the gear is greater than 90 ° and equal to or less than 180 °.
If it does in this way, the movement distance (stroke) of a cam follower can be lengthened, and the performance of a drive unit can be improved.

In the drive unit of the present invention, the lens holder holding the lens is driven by the motion conversion means.
In this way, the lens can be easily moved.

In the drive unit of the present invention, the lens is an optical system lens.
In this way, a miniaturized optical system lens driving unit can be provided.

  According to the motor and the drive unit of the present invention, it is possible to provide a motor and a drive unit that can reduce the plane area and can be miniaturized.

[First Embodiment of Motor]
Hereinafter, a first embodiment of a motor of the present invention will be described with reference to the drawings.
FIG. 1: has shown the schematic plan view of the principal part concerning 1st embodiment of the motor of this invention.
FIG. 2 is a schematic view of a main part according to the first embodiment of the motor of the present invention, where (a) shows a front view and (b) shows a side view.
Further, FIG. 3 shows a schematic perspective view of the first embodiment according to the motor of the present invention.
1, 2, and 3, the motor 1 is a two-pole step motor, and includes a stator 2, a rotor 3, a coil 4, a train wheel 5, an output shaft 6, a substrate 7, and the like.

<Stator>
The stator 2 is a plate-like member made of a magnetic material, and is generally manufactured by press molding. Further, as shown in FIG. 4A, the stator 2 has a substantially H-shaped planar shape, and has a horizontally long connecting portion 22 and a left side portion formed so as to be orthogonal to the left end of the connecting portion 22. 21 and a right side portion 23 formed so as to be orthogonal to the right end of the connecting portion 22. Furthermore, a substantially circular through-hole 210 in which the magnet 31 is accommodated is formed in a range where the left side portion 21 and the connecting portion 22 are connected. The through-hole 210 is formed with small semicircular cutouts 211 in the three directions of the longitudinal direction of the left side portion 21 and the direction of the connecting portion 22.
In addition, the stator 2 has narrow portions 212 formed around the through hole 21, that is, at three positions on the left side, the upper right side and the lower right side of the through hole 21. The magnet 31 is rotated by alternately magnetizing the three enclosed regions.

As shown in FIG. 2, the stator 2 is attached on the substrate 7 by a post 71 and a screw 72, and a coil winding core 41 is attached on the stator 2.
Here, preferably, as shown in FIG. 4A, the upper and lower ends of the left side of the left side 21 and the upper and lower ends of the right side of the right side 23 are positioned as the positioning portions of the stator 2 in the direction of the connecting portion 22. A substantially semicircular cutout 24 may be formed. The notches 24 formed at these four locations engage with the respective posts 71 to position the stator 2. In this way, compared with the case where a hole (not shown) for inserting the stator 2 is formed in the post 71, the outer peripheral portion of the hole can be cut off, and the motor 1 can be reduced in size. And the positioning part can be easily formed.

<Rotor>
The rotor 3 includes a rotor kana 32 and a magnet 31 coupled to the rotor kana 32. The rotor kana 32 is a small gear having ten teeth, and is supported by a bearing plate 73 attached to the substrate 7 and a train wheel bridge 53 and rotates according to the rotation of the magnet 31. The magnet 31 is substantially cylindrical and is fitted into the shaft body of the rotor kana 32. Further, in FIG. 1, the magnet 31 is a magnet whose left upper side is magnetized to the N pole and whose lower right side is magnetized to the S pole. The bearing plate 73 has a substantially cylindrical shape having an upper lid, and a through-hole into which a small-diameter portion called a tenon formed at the tip of the shaft body of the rotor kana 32 is inserted is formed in the upper lid. The bearing plate 73 is mounted on the substrate 7 by pressing the cylindrical portion into the substrate 7. Further, when the stator 2 is attached to the substrate 7, the bearing plate 73 is inserted into the through hole 210, and the upper lid protrudes above the stator 2.
In the present embodiment, the magnet 31 is a magnet magnetized in two poles, but the present invention is not limited to this. For example, a magnet magnetized in an even pole such as a quadrupole or hexapole is used. It may be used.

<Coil>
The coil 4 has two coil cores 41 and a coil wire 42 wound around each coil core 41.
The coil winding core 41 is a plate-like member made of a magnetic material, and is generally manufactured by press molding. As shown in FIG. 4B, the coil winding core 41 has a substantially I-shaped planar shape, and is formed at a rod-shaped winding portion 411 around which the coil wire 42 is wound and at the left end of the winding portion 411. The left side portion 412 and the right side portion 413 formed at the right end of the winding portion 411 are formed. The lower part of the left side part 412 has a shape separated from the notch 211 so as not to affect the rotation of the rotor 3.

Further, the coil winding core 41 is mounted on the stator 2 by a post 71 and a screw 72 as shown in FIG.
As shown in FIG. 4 (b), the coil core 41 is provided in the direction of the connecting portion 22 as a positioning portion of the coil core 41 on the left upper end portion of the left side portion 412 and the right upper end portion of the right side portion 413. A substantially semicircular cutout 414 is formed. The notches 414 formed at these two locations are engaged with the posts 71 to position the coil core 41. In this way, compared to the case where a hole (not shown) for inserting the coil core 41 is formed in the post 71, the outer peripheral portion of the hole can be partially cut off. Can be reduced in size, and the positioning portion can be easily formed.

Further, preferably, as shown in FIG. 1, the same coil core 41 may be disposed to face each other. At this time, since the two coil winding cores 41 are symmetrically arranged, the coil winding core 41 attached to the upper part and the coil winding core 41 attached to the lower part can be used in common in the same figure. Cost reduction can be achieved.
Further, in the motor 1 of the present embodiment, rod-shaped winding portions 411 are arranged substantially in parallel, and a train wheel 5 described later is disposed between the coils 4 in a planar manner. In this way, each component (stator 2, rotor 3, coil 4, and train wheel 5) can be arranged with high density (in a state where useless empty space is omitted), and the width of the motor 1 can be further increased. Can be narrowed.
In the present embodiment, the cross-sectional shape of the winding part 411 is rectangular, but is not limited thereto, and may be various shapes such as a circle and an ellipse.

<Wheel train>
The train wheel 5 includes a rotor kana 32, a first intermediate wheel 51, a second intermediate wheel 52, and an output shaft 6. In the present embodiment, the train wheel 5 includes the first intermediate wheel 51 and the second intermediate wheel 52. However, the present invention is not limited to this. For example, the wheel train 5 includes the rotor kana 32. And the output shaft 6 (that is, when there is no intermediate wheel between the rotor kana 32 and the output shaft 6), or one or more intermediate wheels may be used.

The first intermediate wheel 51 includes a large gear 511 having 50 teeth meshing with the rotor kana 32, a small gear (also referred to as a kana) 512 having ten teeth integrally formed on the upper surface of the large gear 511, And a shaft body (not shown).
The second intermediate wheel 52 includes a large gear 521 having 60 teeth meshing with the small gear 512, and a small gear having seven teeth integrally formed on the lower surface of the large gear 521 (also referred to as a kana). ) 522 and a shaft main body (not shown) including a tenon. The small gear 522 meshes with the large gear 62 having 56 teeth of the output shaft 6.
As described above, the train wheel 5 includes the two intermediate wheels 51 and 52 between the rotor kana 32 and the output shaft 6 for speed adjustment (in this embodiment, reduction of a reduction ratio of 1/240) and Torque adjustment can be easily performed.
The intermediate wheels 51 and 52 are constituted by large gears 511 and 521 and small gears 512 and 522, respectively. In this way, the structure can be simplified, and the manufacturing cost can be reduced by integrally forming the large gear 511 and the small gear 512 and the large gear 521 and the small gear 522, respectively. it can.

As shown in FIGS. 1 and 2, the train wheel 5 is arranged such that the first intermediate wheel 51, the second intermediate wheel 52, and the output shaft 6 overlap with the coil 4 in a plan view and are separated in cross section. ing. If it does in this way, the plane area of the motor 1 can be reduced and the motor 1 can be reduced in size.
The train wheel 5 excluding the rotor 3 is pivotally supported by the substrate 7 and the train wheel bridge 53, and the coil 4 and the stator 2 are disposed on the opposite side of the train wheel 5 with the substrate 7 interposed therebetween. As a result, the shaft support distance (bearing span) of the rotor kana 32, the intermediate shafts 51 and 52, the output shaft 6 and the like constituting the train wheel 5 is shortened, and each shaft length can be shortened. Reliability and productivity in assembly can be improved. Moreover, the design freedom at the time of arrange | positioning the wheel train 5 can be raised. Note that the rotor 3 of the train wheel 5 is pivotally supported by the bearing plate 73 and the train wheel bridge 53 mounted on the substrate 7 as described above.

<Output shaft>
The output shaft 6 includes a shaft main body 61 and a large gear 62. The large gear 62 is pivotally supported by the substrate 7 and the train wheel bridge 53, and the shaft main body 61 projects from the train wheel bridge 53.

<Board>
The substrate 7 has a rectangular shape, and through holes (not shown) are formed at four corners. Posts 71 formed integrally with the columnar member 701 are press-fitted into the through holes from below. Thus, the post 71 is press-fitted and erected at the four corners of the upper surface of the substrate 7, and the columnar member 701 is erected and press-fitted at the four corners of the lower surface. Further, the substrate 7 has a structure in which a through hole for supporting the first intermediate wheel 51, the second intermediate wheel 52 and the output shaft 6 is formed, and a bearing plate 73 is press-fitted upright at the position of the rotor 3. It is as. Moreover, the coil 4 is each arrange | positioned at the edge of the long side which the board | substrate 7 opposes, Thereby, the motor 1 can be reduced in size. The post 71 and the columnar member 701 are cut with female screws (not shown) into which the screws 72 and 702 are tightened, respectively. By using the substrate 7, the post 71 and the cylindrical member 701, the motor 1 can be easily assembled. For example, first, the stator 2 and the coil 4 are stacked on the substrate 7 in a state where the stator 2 and the coil 4 are engaged with the post 71, and the screws 72 are fastened to the post 71, thereby firmly fixing the stator 2 and the coil 4 to the substrate 7. Secure to. Next, the rotor 3 is attached to the bearing plate 73, the first intermediate wheel 51, the second intermediate wheel 52, and the output shaft 6 are attached to the base plate 7, and then the wheel train receiver 53 is covered, and the screw 702 is attached to the cylinder. By tightening on the member 701, the train wheel 5 is pivotally supported.
In this embodiment, the post 71 and the columnar member 701 are integrally formed and the post 71 is press-fitted into the through hole of the substrate 7. However, the present invention is not limited to this structure. The post 71 and the columnar member 701 may be integrally formed.

<Telescope receiver>
The train wheel bridge 53 has a rectangular shape that is substantially the same size as the base plate 7, and is not shown, but penetrates the rotor 3, the first intermediate wheel 51, the second intermediate wheel 52, and the output shaft 6. A hole is drilled, and a screw hole for the screw 702 is drilled.
Further, as shown in FIG. 3, the train wheel bridge 53 has a cam follower opening 531 formed therein.
Although not shown, a wall may be erected in the vicinity of the outer peripheral edge of the train wheel bridge 53 so that foreign matter or the like does not enter between the train wheel bridge 53 and the substrate 7. Then, it is possible to prevent malfunction due to foreign matters entering the train wheel 5.

According to the motor 1 having the above-described configuration, at least a part of the train wheel 5 is disposed so as to overlap the coil 4 in a plan view and to be separated in cross section, so that the plane area of the motor 1 is reduced. Therefore, the size can be reduced.
Further, the train wheel 5 is pivotally supported by the substrate 7 and the train wheel bridge 53, and the coil 4 and the stator 2 are disposed on the opposite side of the train wheel 5 with the substrate 7 interposed therebetween. The shaft support distance (bearing span) of the rotor kana 32, the intermediate shafts 51 and 52, the output shaft 6 and the like constituting the shaft is shortened, each shaft length can be shortened, and the mechanical strength, operational reliability, and production in assembly. Etc. can be improved. Moreover, the design freedom at the time of arrange | positioning the wheel train 5 can be raised.

  In addition, the motor 1 of this embodiment is not limited to the said structure, For example, it is good also as a structure which arrange | positions a train wheel above a coil, and has various other application examples.

[Second Embodiment of Motor]
Next, a second embodiment of the motor of the present invention will be described with reference to the drawings.
FIG. 5: has shown the schematic front view of 2nd embodiment concerning the motor of this invention.
In the figure, the motor 1a of this embodiment is different from the motor 1 of the first embodiment in that a stator 2a having both functions of the stator 2 and the substrate 7 is used instead of using the substrate 7. Other components are almost the same as those in the first embodiment.
Therefore, in FIG. 5, the same components as those in FIG. 2A are denoted by the same reference numerals, and detailed description thereof is omitted.

  The stator 2 a has substantially the same shape as the stator 2, and has a through hole (not shown) for supporting the first intermediate wheel 51, the second intermediate wheel 52, and the output shaft 6. In the stator 2a, a bearing plate 73a having substantially the same structure as the bearing plate 73 is press-fitted and installed in the through hole 210. In addition, when it is necessary to provide the said through-hole in the position remove | deviated from the connection part 22 shown to Fig.4 (a), although not shown in figure, a protrusion part is formed in the connection part 22, and in this protrusion part, A through hole is drilled.

  In the motor 1a, the train wheel 5 excluding the rotor 3 is pivotally supported by the stator 2a and the train wheel bridge 53, and the coil 4 is disposed on the opposite side of the train wheel 5 with the stator 2a interposed therebetween. . That is, since the stator 2a also has the function of the substrate 7, it is not necessary to use the substrate 7, so that the number of parts can be reduced, the manufacturing cost can be reduced, and the motor 1a can be made thinner. can do. Furthermore, since the shaft support distance (bearing span) of the rotor kana 32, the intermediate wheels 51 and 52, the output shaft 6 and the like constituting the train wheel 5 is shortened, and the respective shaft lengths can be shortened, the mechanical strength and the operation Reliability and productivity in assembly can be improved. Note that the rotor 3 of the train wheel 5 is pivotally supported by a bearing plate 73a and a train wheel receiver 53 mounted on the stator 2a.

  Further, the post 71a and the columnar member 701a are integrally formed, and a female screw (not shown) into which the screw 72 and the screw 702 are tightened is cut. By using the stator 2a, the post 71a, and the columnar member 701a, the motor 1a can be easily assembled. For example, first, the cylindrical member 701a and the post 71a are screwed into the train wheel bridge 53 using the screw 702, and the bearing plate 73a is press-fitted into the stator 2a. Next, the rotor 3, the first intermediate wheel 51, the second intermediate wheel 52, and the output shaft 6 are attached to the train wheel bridge 53, and the stator 2a is then connected to the column member 701a while the notch 24 is engaged with the post 71a. Place on top. Here, the first intermediate wheel 51, the second intermediate wheel 52, and the output shaft 6 are pivotally supported by the train wheel bridge 53 and the stator 2a. The rotor 3 is pivotally supported by a bearing plate 73a mounted on the stator 2a and a train wheel bridge 53. Subsequently, the motor 1a can be assembled by stacking the coils 4 in a state of being engaged with the posts 71a on the stator 2a and tightening the screws 72 into the posts 71a.

  Thus, according to the motor 1a of the present embodiment, the plane area of the motor 1a can be reduced, and the motor 1a can be reduced in thickness. Moreover, since it is not necessary to use the board | substrate 7, the number of parts can be reduced and the cost reduction of a manufacturing cost can be aimed at.

[First Embodiment of Drive Unit]
Next, a drive unit using the motor of the present invention will be described with reference to the drawings.
FIG. 6 shows a schematic perspective view of the first embodiment according to the drive unit of the present invention.
In the figure, the drive unit of the present embodiment is an optical system lens drive unit 10 that moves a lens (not shown) in a linear direction. The optical lens drive unit 10 includes the motor 1 described above, a cam 91 and a cam follower 92 as motion conversion means, and a lens case 8 that holds the lens in a reciprocating manner.
The drive unit of the present invention is not limited to driving a lens, and can drive various driving objects.

Since the motion conversion means of this embodiment is configured by a transmission member (cam 91) and a driven member (cam follower 92), the configuration is simplified and the manufacturing cost can be reduced.
Further, by using the cam 91 as the transmission member and the cam follower 92 as the driven member, the rotational motion of the motor 1 can be easily converted into a reciprocating motion. The motion conversion means is not limited to the cam 91 and the cam follower 92 and is not shown, but for example, a motion conversion means using a rack and pinion or a crank mechanism may be used.

The cam 91 is a plate cam connected to the output shaft 6 of the motor 1, and moves the cam follower 92 in the vertical direction according to the rotation of the output shaft 6. The cam follower 92 is press-fitted into the lens holder 83, converts the rotational motion of the output shaft 6 into linear motion, and moves the lens holder 83 in the vertical direction.
Further, the motion conversion means of the present embodiment is configured to convert the rotational motion of the output shaft 6 into the linear motion of the cam follower 92 using a cam mechanism, but the motion conversion means of the present invention is limited to this. For example, various motion converting means for converting into reciprocating motion, rocking motion, periodic motion, and the like can be used.

  The lens case 8 is formed in a substantially cubic housing 81, a pair of guide pins 82 formed in the housing 81 for positioning the lens holder 83 in the circumferential direction, and held in the housing 81 so as to be reciprocally movable. And a lens holder 83 to which is attached. Although not shown, the lens holder 83 is biased downward by a biasing means such as a spring. Instead of providing the urging means, a positive cam or a yoke cam may be used.

As described above, according to the optical lens driving unit 10 of the present embodiment, the motor 1 can be used to reduce the size of the entire driving unit.
Further, since the lens holder 83 holding the lens is driven by the cam 91 and the cam follower 92, the optical lens driving unit 10 can easily move the lens. Furthermore, since the lens is used as an optical system lens, it is possible to provide a miniaturized optical system lens driving unit 10 capable of realizing an autofocus function and an autozoom function.

[Second Embodiment of Drive Unit]
Next, a second embodiment of the drive unit of the present invention will be described with reference to the drawings.
FIG. 7 shows a schematic perspective view of the second embodiment according to the drive unit of the present invention.
FIG. 8 shows a cross-sectional view taken along the line AA in FIG.
Further, FIG. 9 shows a schematic enlarged view of the main part for explaining the cam forming gear of the second embodiment according to the drive unit of the present invention.
7, 8, and 9, the optical system lens driving unit 10 b according to the present embodiment is compared with the optical system lens driving unit 10 according to the first embodiment, instead of using the cam 91, instead of using the output shaft 6 b of the motor 1 b. The difference is that a cam forming gear 62b in which a gear and a cam are formed is formed. Other components are almost the same as those in the first embodiment.
Therefore, in FIG. 7, 8, and 9, the same code | symbol is attached | subjected about the component similar to FIG. 6, and the detailed description is abbreviate | omitted. In FIG. 8, the first intermediate wheel 51 and the rotor 3 are omitted so that the structure of the main part can be easily understood.

  The output shaft 6b includes a shaft body 61 and a cam forming gear 62b. The cam forming gear 62b includes a cam forming portion 621b and a large gear portion 622b. Compared with the large gear 62 described above, the cam forming portion 621b is located on the opposite side of the second intermediate wheel 52 across the center of the output shaft. And a large gear portion 622b is formed on the second intermediate wheel 52 side.

  Further, as shown in FIG. 9, the cam forming gear 62b has a cam forming portion 621b in a range where the angle with respect to the center of the cam forming gear 62b is greater than 90 ° and equal to or less than 180 °. That is, when the cam follower 92 moves to the highest position, the cam follower 92 moves to a position away from the center of the output shaft by a distance H. When the output shaft 6b rotates counterclockwise by θ ′ (output shaft rotation angle), the cam follower 92 descends along the cam forming portion 621b and the height of the virtual cam follower 92b (that is, the output shaft). It descends to a position (distance h from the center). At this time, if the cam forming portion 621b is formed in a range where the angle with respect to the center of the cam forming gear 62b (that is, the cam forming angle θ) is greater than 90 ° and equal to or less than 180 °, the movement distance (stroke) of the cam follower 92 is = H-h can be lengthened, and the performance (for example, resolution) of the optical system lens driving unit 10b can be improved.

  In the optical lens drive unit 10b, the cam follower 92 protrudes from the cam follower opening 531 of the train wheel bridge 53 toward the center of the motor 1b, and is in contact with the cam forming portion 621b of the cam forming gear 62b. . Therefore, when the output shaft 6b swings and rotates within the range of the output shaft rotation angle θ ′, the cam follower 92 linearly moves in the vertical direction along the curved surface of the cam forming portion 621b.

  As described above, according to the optical lens driving unit 10b of the present embodiment, the cam forming gear 62b of the output shaft 6b can have a cam function, and the number of parts can be reduced by using parts in common. Cost reduction can be achieved.

The motor and the drive unit of the present invention have been described with reference to the preferred embodiments. However, the motor and the drive unit according to the present invention are not limited to the above-described embodiments, and are various within the scope of the present invention. Needless to say, it is possible to implement this change.
For example, in the optical system lens drive unit 10, the flat plate cam 91 is used, but as shown in FIG. 10, a disk-shaped cam 91 c having a high portion and a low portion connected by a gentle slope on the upper surface is used. May be. In this way, it is possible to provide an optical lens driving unit 10c that can reciprocate the lens more smoothly.

  As described above, the motor and the drive unit of the present invention are not limited to the optical lens drive unit, and can be effectively applied to various small drive units.

The schematic plan view of the principal part concerning 1st embodiment of the motor of this invention is shown. It is the schematic of the principal part concerning 1st embodiment of the motor of this invention, (a) is a front view, (b) has shown the side view. The schematic perspective view of 1st embodiment concerning the motor of this invention is shown. It is the schematic of 1st embodiment concerning the motor of this invention, (a) is a top view of a stator, (b) has shown the top view of a coil winding core. The schematic front view of 2nd embodiment concerning the motor of this invention is shown. The schematic perspective view of 1st embodiment concerning the drive unit of this invention is shown. The schematic perspective view of 2nd embodiment concerning the drive unit of this invention is shown. The AA sectional view in Drawing 7 is shown. The schematic enlarged view of the principal part for demonstrating the cam formation gear of 2nd embodiment concerning the drive unit of this invention is shown. The schematic perspective view for demonstrating the application example of 1st embodiment concerning the drive unit of this invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a, 1b Motor 2, 2a Stator 3 Rotor 4 Coil 5 Wheel train 6, 6b Output shaft 7 Board | substrate 8 Lens case 10, 10b, 10c Optical system lens drive unit 21 Left side part 22 Connection part 23 Right side part 24 Notch 31 Magnet 32 Rotor Kana 41 Coil core 42 Coil wire 51 First intermediate wheel 52 Second intermediate wheel 61 Shaft body 62 Large gear 62b Cam forming gear 71, 71a Post 72 Screw 73, 73a Bearing plate 81 Housing 82 Guide pin 83 Lens holder 91 91c Cam 92 Cam follower 92b Virtual cam follower 511, 521 Large gear 512, 522 Small gear 531 Cam follower opening 621b Cam forming portion 622b Large gear portion 701, 701a Cylindrical member 702 Screw 210 Through hole 211 Notch 212 Notch 411 Winding Line part 412 Left side part 413 Right side part 4 4 notch θ cam forming an angle θ'output shaft rotation angle

Claims (17)

A stator made of a magnetic material, a rotor having a magnet and a rotor kana, a coil winding core made of a magnetic material, a coil having a coil wire wound around the coil winding core, and a wheel train including the rotor kana and an output shaft. A motor,
The coil winding core is formed of two bodies, and further, at least a part of the train wheel is arranged so as to overlap with the coil in a plan view and to be separated in cross section. motor.   The motor according to claim 1, wherein the coil winding cores are arranged to face each other.   The winding portion of the coil core is rod-shaped, the winding portions of the coil core are arranged in parallel, and the train wheel is arranged between the coils in a plane. The motor according to claim 1, wherein the motor is provided.   The motor according to any one of claims 1 to 3, wherein the train wheel has at least one intermediate wheel between the rotor kana and the output shaft.   The motor according to claim 4, wherein the intermediate wheel includes a gear and a pinion.   The said train wheel is supported by the board | substrate and the train wheel bridge, and the said coil and the said stator are arrange | positioned on the opposite side of the said train wheel across the said board | substrate. The motor according to claim 5.   The motor according to claim 6, wherein the substrate has a rectangular shape, and the coil is disposed on an edge of a long side of the substrate.   The post is erected on the substrate, and the positioning portion of the stator and / or the coil that engages with the post has a notch shape. motor.   The wheel train is supported by the stator and a train wheel bridge, and the coil is disposed on the opposite side of the wheel train with the stator interposed therebetween. The motor as described in any one.   The motor according to claim 9, wherein a post is attached to the train wheel bridge, and a positioning portion of the stator and / or the coil engaged with the post has a notch shape. . The motor according to any one of claims 1 to 10, and
A drive unit comprising a motion conversion means for converting the rotational motion of the motor into another motion.   The drive unit according to claim 11, wherein the motion conversion means includes a transmission member and a driven member.   The drive unit according to claim 12, wherein the transmission member is a cam, and the driven member is a cam follower.   The drive unit according to claim 13, wherein a gear is formed on an output shaft of the motor, and the cam is formed on a part of the gear.   The drive unit according to claim 14, wherein a cam formed on a part of the gear of the output shaft is formed in a range in which an angle with respect to a center of the gear is greater than 90 ° and equal to or less than 180 °.   The drive unit according to claim 11, wherein a lens holder holding a lens is driven by the motion conversion unit.   The drive unit according to claim 16, wherein the lens is a lens of an optical system.

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