JP2006094607A - Motor manufacturing method, motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact motor manufacturing method for evenly maintaining an interval between a rotor and a stator and avoiding the torque reduction of the rotor, and a motor. <P>SOLUTION: The motor manufacturing method manufactures the motor provided with the cylindrical stator for forming a magnetic field within a cylindrical shape, the cylindrical rotor disposed and spaced through an air gap within the cylindrical shape of the stator and rotatably driven by the magnetic field formed by the stator, and a main housing having a positioning section for positioning a rotational shaft of the rotor and disposing the stator and the rotor, and has a disposing process for disposing a spacer having a thickness fitted to the air gap between the rotor and the stator and also disposing the stator, the rotor and the spacer in the main housing so as to bring the rotor into contact with the positioning section, a stator fixing process for fixing the stator to the main housing, and a spacer removing process for removing the spacer from the main housing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a motor manufacturing method for manufacturing a motor including a stator that forms a magnetic field and a rotor that is rotationally driven by the magnetic field of the stator, and a motor manufactured by such a motor manufacturing method.

  2. Description of the Related Art It is widely practiced to incorporate an imaging device that captures a subject and obtains a digital captured image in a small device such as a mobile phone or a PDA (Personal Digital Assistant). Since an imaging device is provided in a small device that is always carried around, it is possible to easily take a picture anytime without having to carry a digital camera or a video camera. In addition, these small devices are generally equipped with a data communication function using wireless or infrared rays in advance, and the captured images are immediately taken on the spot to other mobile phones, personal computers, etc. There is also an advantage that it can be sent to.

  However, since an imaging device built in a small device such as a mobile phone is considerably smaller than a normal digital camera, the size of components such as a lens and a charge coupled device (CCD) and the components are not limited. The storage space is greatly limited. For this reason, these small devices have insufficient shooting functions and image quality of captured images to be used as alternative devices for digital cameras. For obtaining images instead of memos, and for standby screens for mobile phones and the like. As in the case of obtaining an image, the use is often limited for shooting that does not require image quality.

  With regard to these points, in recent years, high-pixel small CCDs and high-contrast small lenses have been developed, and the quality of captured images taken using small devices such as mobile phones and PDAs is rapidly increasing. Is going on. In order to enhance the imaging function, which remains as a remaining issue, it is particularly desirable that these small devices are equipped with an autofocus function and a zoom function that are normally installed in digital cameras.

  The autofocus function and the zoom function are realized by moving a plurality of lenses in a direction along the optical axis in the imaging apparatus. In digital cameras, video cameras, and the like, as a lens driving method, a method using rotation of a DC motor or a stepping motor, a method using compression / expansion of a piezoelectric element, and the like are known. When these methods are applied to a small device such as a mobile phone, a cylindrical hollow rotor that surrounds the outer periphery of the lens barrel holding the lens in terms of downsizing of the device and accuracy of lens movement control. It is considered preferable to use a hollow stepping motor that rotates the stator by applying a pulse current to the stator that surrounds the outer periphery of the hollow rotor.

As a lens driving method to which such a hollow stepping motor is applied, for example, a method of driving the lens barrel in a direction along the optical axis via a moving mechanism such as a cam mechanism between the lens barrel and the rotor ( For example, see Patent Literature 1, Patent Literature 2, and Patent Literature 3), a method of moving a lens barrel with the rotor itself (for example, Patent Literature 4, Patent Literature 5, Patent Literature 6), a lens barrel and a rotor. A method of integrating them (for example, Patent Document 7) has been proposed.
JP-A-56-147132 JP 59-109006 JP 59-109007 JP 60-415 JP-A-60-416 JP 60-417 Japanese Patent Laid-Open No. 62-195615

  Here, in the stepping motor, a gap (referred to as an air gap) is provided between the rotor and the stator in order to rotate the rotor. There's a problem. Conversely, if the air gap is narrow, the attractive force with the magnetic field formed by the stator increases, so if the air gap is not uniform over the entire circumference of the rotor, the rotor is attached to the stator at a particularly narrow portion of the air gap. The torque is strongly attracted and biased, and the torque decreases.

  A stepping motor applied to a normal size digital camera or the like is relatively large so that it has a large original torque and a sufficient air gap. Therefore, the influence of torque reduction is small.

  However, in an imaging device that is much smaller than a digital camera, the lens is more susceptible to friction due to the downsizing of the device, making it difficult to drive the lens smoothly. Will not drive at all.

  For these reasons, there is a need for the development of a small motor that has a uniform air gap around the entire circumference of the rotor and avoids torque reduction. However, the rotor made of magnetic material and the stator made of metal tend to stick together, and it is very difficult to arrange the stator and rotor in the main body housing with a uniform air gap. is there.

  In view of the above circumstances, an object of the present invention is to provide a motor manufacturing method and a motor for manufacturing a small motor in which a rotor and a stator are arranged at a uniform interval.

The motor manufacturing method of the present invention that achieves the above object has a cylindrical shape, a stator that forms a magnetic field in the cylindrical shape, and a cylindrical shape that is arranged at a predetermined distance in the cylindrical shape of the stator. Manufactures a motor arranged in a main body housing having a positioning part that physically contacts the rotor and determines the position of the rotation axis of the rotor, which is rotated with respect to the stator by a magnetic field formed by the stator In the motor manufacturing method,
An arrangement process in which a spacer having a thickness corresponding to the predetermined distance is arranged between the rotor and the stator, and the stator, the rotor, and the spacer are arranged in the main body housing so that the rotor contacts the positioning portion;
A stator fixing process for fixing the stator to the main body housing;
And a spacer extracting process for extracting the spacer from the main body casing.

  According to the motor manufacturing method of the present invention, the rotor is disposed in the main body casing so as to contact the positioning portion, and the stator is disposed in the main body casing with a spacer interposed between the rotor and the rotor. The spacer sandwiched between the rotor and the spacer is extracted from the main body housing after the stator is fixed to the main body housing. Therefore, it is possible to avoid a problem that the stator and the rotor are attracted to each other before the adhesive or the like for fixing the stator to the main body casing is dried, and the rotor and the stator are evenly spaced. It can be opened and placed in the main body housing.

Further, in the motor manufacturing method of the present invention, the main body housing is provided with a hole in a part of a corresponding position between the stator and the rotor,
The spacer extracting process is preferably a process of extracting the spacer from the hole provided in the main body casing.

  By providing a hole in the corresponding part of the main body housing between the stator and the rotor, the spacer can be extracted as it is with the motor assembled, and the motor is disassembled, the spacer is extracted, and the motor is reassembled Can be omitted, and the interval between the stator and the rotor can be kept uniform with high accuracy.

Further, the motor of the present invention that achieves the above object has a cylindrical shape, a stator that forms a magnetic field in the cylindrical shape, and a cylindrical shape that is arranged at a predetermined distance in the cylindrical shape of the stator, A rotor that is rotationally driven with respect to the stator by a magnetic field formed by the stator, and a rotation of the rotor that is positioned further inside the cylindrical shape of the rotor and holds the lens so that the optical axis is along the cylindrical axis And a lens holder that is driven in a direction along the cylindrical axis of the rotor, and the stator and the rotor have a positioning portion that physically contacts the rotor and determines the position of the rotation axis of the rotor. In the motor arranged in the housing,
An arrangement process in which a spacer having a thickness corresponding to a predetermined distance is arranged between the rotor and the stator, and the stator, the rotor, and the spacer are arranged in the main body housing so that the rotor contacts the positioning portion;
A stator fixing process for fixing the stator to the main body housing;
It is manufactured through a spacer extracting process of extracting the spacer from the main body casing.

  According to the motor of the present invention, the rotor and the stator are arranged at a uniform interval, and the lens can be smoothly driven even when applied to a small imaging device or the like.

  In addition, about the motor said to this invention, it shows only the basic form here, but this is only in order to avoid duplication, The above-mentioned basic form is not included in the motor said to this invention. Various forms corresponding to the respective forms of the motor manufacturing method are included.

  According to the present invention, it is possible to manufacture a small motor in which a rotor and a stator are arranged at a uniform interval.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an external perspective view of a small imaging device mounted on a mobile phone or the like.

  The imaging apparatus 1 is provided with an autofocus function for focusing on a subject by driving a plurality of lenses in a direction along the optical axis (hereinafter, the direction along the optical axis is referred to as the front-rear direction). The imaging device 1 has an external appearance in which a cylindrical stator 30 is sandwiched between an upper cover 10 and a lower cover 40, and a magnet and a lens to be described later are held inside the stator 30. A lens holder 20 is disposed. Further, the upper cover 10 is provided with a hole 10a used when the imaging device 1 is assembled. The stator 30 corresponds to an example of a stator according to the present invention, and the lens holder 20 corresponds to an example of a lens holder according to the present invention. The combination of the upper cover 10 and the lower cover 40 corresponds to an example of the main body housing according to the present invention, and the hole 10a corresponds to an example of the hole according to the present invention. The hole 10a will be described in detail later.

  FIG. 2 is a cross-sectional view of the imaging device 1 shown in FIG. 1 cut along a plane passing through the straight line AA ′.

  2 shows the upper cover 10, the lower cover 40, the stator 30, and the lens holder 20 that are also shown in FIG. 1, and further includes a first lens 21, a second lens 22, a third lens 23, a magnet 50, A rotating body 51, a CCD 60, and the like are shown.

  The lens holder 20, the magnet 50, and the rotating body 51 have a cylindrical shape coaxial with the stator 30. The magnet 50, the rotating body 51, and the lens holder 20 are arranged inside the stator 30 in this order from the side close to the stator 30. ing. An air gap P is formed between the stator 30 and the magnet 50 at a uniform interval w over the entire circumference of the cylindrical shape. The stator 30 and the magnet 50 constitute a stepping motor. When a pulse current is applied to the stator 30, the magnet 50 is rotated by the number of rotations corresponding to the pulse current. The stator 30 corresponds to an example of the stator according to the present invention, and the magnet 50 corresponds to an example of the rotor according to the present invention.

  Here, the description of FIG. 2 is temporarily interrupted, and the stator 30 and the magnet 50 will be described in detail with reference to FIG.

  FIG. 3 is a diagram showing the stator 30 and the magnet 50.

  The stator 30 is composed of two layers of coil parts, an upper coil part 30a and a lower coil part 30b. Since the upper coil portion 30a and the lower coil portion 30b have the same configuration, the description of the configuration of the lower coil portion 30b is omitted, and only the configuration of the upper coil portion 30a will be described.

  The upper coil portion 30a is formed to be surrounded by a cylindrical shape by an upper coil cover 32 and a lower coil cover 33, and a coil 31 made of a wound conductive wire is stored in the inside surrounded by the cover. . The upper coil cover 32 and the lower coil cover 33 are provided with teeth 32a and 33a arranged so as to alternately mesh with each other inside the cylindrical shape. There is a gap between the teeth 32a and the teeth 33a.

  A pulse current is alternately applied to the coil 31 of the upper coil portion 30a and the coil 31 of the lower coil portion 30b. When a pulse current is applied, magnetic field lines are generated in the coil 31, and the magnetic field lines are guided to the inside of the cylindrical shape by the upper coil cover 32 and the lower coil cover 33. When the introduced magnetic field lines reach the teeth 32a and 33a, the magnetic field lines once enter the air and cross the gap. As a result, one of the teeth 32 a and 33 a arranged so as to mesh with each other is an N pole, and the other is an S pole, and magnetic fields of the N pole and the S pole are alternately formed along the cylindrical inner periphery of the stator 30. .

  The magnet 50 is made of a magnetic material such as neodymium. For example, the magnet 50 is passed through the inside of a ring-shaped head in which N poles and S poles are alternately formed along the inner periphery. It is a permanent magnet that is alternately poled along the outer circumference with N and S poles. The magnet 50 is rotationally driven with respect to the stator 30 by a repulsive force and an attractive force with a magnetic field formed by the stator 30.

  The rotation drive of the magnet 50 will be described.

  The magnet 50 has 48 poles, and each of the upper coil portion 30a and the lower coil portion 30b has 48 teeth. Further, the position of the teeth of the upper coil portion 30a and the position of the teeth of the lower coil portion 30b are shifted by half of the teeth. When a pulse current is applied to the stator 30 as will be described later, the magnet 50 rotates with one pole as one step and rotates once in 48 steps.

  When rotating the magnet 50 in the forward direction, by repeating energization in the order of the forward direction of the upper coil portion 30a, the forward direction of the lower coil portion 30b, the reverse direction of the upper coil portion 30a, and the reverse direction of the lower coil portion 30b, The magnet 50 can be reliably rotated in the forward direction. Further, by repeating energization in the order of the forward direction of the upper coil portion 30a, the reverse direction of the lower coil portion 30b, the reverse direction of the upper coil portion 30a, and the forward direction of the lower coil portion 30b, the magnet 50 is rotated in the reverse direction. be able to.

  This is the end of the description of FIG. 3, and the description will return to FIG.

  A rotating body 51 shown in FIG. 2 is bonded to the inside of the magnet 50 and is rotated as the magnet 50 rotates. A spiral groove 51 a is provided on the inner surface of the rotating body 51, and this spiral groove 51 a meshes with a spiral protrusion 20 a (described later) provided on a part of the outer surface of the lens holder 20.

  The lens holder 20 holds lenses arranged in the order of the first lens 21, the second lens 22, and the third lens 23 from the side close to the upper cover 1. The first lens 21, the second lens 22, and the third lens 23 satisfy the following conditions.

  First, in this example, the first lens 21 is made of a glass material, and has a meniscus shape having a positive power with a front surface (side closer to the upper cover) (hereinafter referred to as a surface) having a convex shape.

  The second lens 22 is made of a plastic material. In this example, the second lens 22 has a meniscus shape having a negative power with an aspherical back surface and a concave surface.

  The third lens 23 is made of a plastic material, and both surfaces of the front and back surfaces are aspherical, and the back surface is a concave shape near the optical axis and has a negative power shape.

Further, if the paraxial focal length of the entire lens system is f, the paraxial focal length of the third lens 23 is f3, the radius of curvature of the surface of the first lens 21 is R1, and the half angle of view at the maximum image height is θ,
0.6 <R1 / f <0.8 (1)
-1.0 <f3 / f <0 (2)
0.60 <tan θ <0.70 (3)
Meet.

  By applying the first lens 21, the second lens 22, and the third lens 23 that satisfy the above conditions, a compact and highly accurate lens group can be configured.

  Further, a convex portion 20 b extending in the front-rear direction is provided on the outer surface of the lens holder 20 on the side of the first lens 21, and the outer surface of the portion holding the second lens 22 and the third lens 23. Is provided with a spiral protrusion 20a.

  A mechanism for driving the lens holder 20 in the front-rear direction will be described.

  When a pulse current is applied to the stator 30, the rotating body 51 is rotated once every 48 steps as the magnet 50 rotates. The spiral groove 51a of the rotating body 51 is provided two more times (= 96 steps) than the spiral groove 51a of the lens holder 20, and the lens holder 20 can move by 96 steps.

  The rotational force of the rotating body 51 is converted into a force in the front-rear direction by the spiral groove 51a and the spiral protrusion 20a. The converted force in the front-rear direction is transmitted to the lens holder 20, and the lens holder 20 is driven in the front-rear direction. In this embodiment, the lens holder 20 moves about 1.25 mm in the front-rear direction with a full stroke (= 96 steps), and moves about 13 μm in the front-rear direction in one step. That is, in this imaging device 1, the lens position can be controlled in units of 13 μm.

  Further, a spring 24 biased forward is attached to the lower side of the lens holder 20 (side closer to the lower cover 40), and the driving force of the lens holder 20 is reinforced by the spring 24. Yes.

  The upper cover 10 and the lower cover 40 shown in FIG. 2 are connected by screws (not shown).

  The upper cover 10 is provided with a concave portion 10b that extends in the front-rear direction and fits with the convex portion 20b at a portion corresponding to the convex portion 20b of the lens holder 20. The rotational force of the magnet 50 is transmitted to the lens holder 20 by the spiral groove 51a and the spiral protrusion 20a. However, when the movement of the lens holder 20 in the rotational direction is not restricted, the lens holder 20 rotates in the front-rear direction. Since the lens is moved, the image may be shifted due to the eccentricity of the lens. Since the convex part 20b of the lens holder 20 and the concave part 10b of the upper cover are fitted to each other, such rotation of the lens holder 20 is prevented.

  The lower cover 40 is provided with a groove 40a surrounding the inside of the rotating body 51, and the movement of the magnet 50 and the rotating body 51 in the left-right direction is restricted by the groove 40a. If the magnet 50 and the rotating body 51 are moved in the left-right direction, the lens holder 20 is also rattled accordingly, and there is a possibility that the driving accuracy of the lens is deteriorated. In the imaging apparatus 1, the lower cover 40 also serves as a mechanism for preventing the movement of the magnet 50 and the rotating body 51, and avoids the problem that a new part is provided to increase the size of the apparatus, thereby enabling high-precision lens driving. Can be realized. The groove 40a corresponds to an example of a positioning portion according to the present invention.

  The lower cover 40 holds a low-pass filter 41 and a CCD 60.

  The subject light that has passed through the first lens 21, the second lens 22, and the third lens 23 is received by the CCD 60 through the low-pass filter 41. In the low-pass filter 41, unnecessary fine spatial frequency components included in the subject light are leveled. By using the low-pass filter 41, problems such as pseudo colors and moire can be reduced.

  The subject light that has passed through the low-pass filter 41 is received by the CCD 60, and image data representing the subject is generated.

  In the imaging apparatus 1 as described above, the autofocus function is realized by the following procedure. In the following description, it is assumed that the lens holder 20 moves forward by applying a forward pulse current to the stator 30.

  First, subject light is roughly read by the CCD 60, and low-resolution data representing the subject light is generated. This low resolution data is transmitted to a CPU such as a mobile phone provided with the imaging device 1.

  Subsequently, a forward pulse current for moving the lens holder 20 by one step is supplied to the stator 30.

  When a pulse current is applied to the stator 30, the magnet rotates by one step, and the rotating body 51 is rotated with the rotation of the magnet. The rotational force of the rotating body 51 is converted into a forward force and transmitted to the lens holder 20, and the lens holder 20 moves about 13 μm in the forward direction.

  When the lens holder 20 moves, the subject light is read again by the CCD 60 and low resolution data is generated. This low resolution data is also transmitted to a CPU such as a mobile phone provided with the imaging device 1.

  The CPU detects the contrast of each of the two low-resolution data transmitted from the CCD 60, and determines which of the detected contrasts is greater. When the contrast of the previous low resolution data is larger, a reverse pulse current for returning the lens holder 20 by one step backward is energized to the stator 30 and the contrast of the subsequent low resolution data is larger. In this case, a forward pulse current that moves the lens holder 20 forward one step further is supplied to the stator 30.

  As described above, the process of detecting the contrast by moving the lens holder 20 is continued for up to 96 steps until the magnitude of the contrast of the previous low-resolution data and the contrast of the subsequent low-resolution data are reversed. When the magnitudes of these contrasts are reversed, the stator 30 is energized with a pulse current in a direction opposite to the direction energized immediately before, and the lens holder 20 is returned by one step. The position of the lens holder 20 at this time is an in-focus position where the contrast is maximized.

  The imaging device 1 is basically configured as described above.

  Here, when the air gap P opened between the stator 30 and the magnet 50 shown in FIG. 2 is biased, a part of the magnet 50 is strongly attracted to the stator 30 and the magnet 50 may not rotate. There is. Therefore, the air gap P needs to be uniform over the entire circumference of the magnet 50. Hereinafter, a method for assembling the imaging device 1 so that the air gap P is uniform will be described.

  FIG. 4 is an exploded perspective view of the image pickup apparatus 1, and FIG. 5 is a flowchart illustrating a method for assembling the image pickup apparatus 1.

  As shown in FIG. 4, in the imaging apparatus 1, a plurality of columns 11 provided on the upper cover 10 and the lower cover 40 are connected by screws 80, and the space surrounded by the upper cover 10, the columns 11, and the lower cover 40. The stator 30 is fixed to the base. Further, the magnet 50, the rotating body 51, and the lens holder 20 are sequentially arranged in the cylindrical shape of the stator 30 from the side close to the stator 30.

  As preparations for attaching various elements to the upper cover 10 and the lower cover 40, a magnet 30 having a rotating body 51 attached to the inner peripheral surface is prepared, and the first lens 21, the second lens 22, and the like shown in FIG. The third lens 23 is attached to the lens holder 20 (step S1 in FIG. 5).

  Subsequently, the lens holder 20 to which the lens is attached is inserted further inside the rotating body 51 attached to the inner peripheral surface of the magnet 30 (step S2 in FIG. 5).

  When the above-described preparation is completed, the stator 30 is disposed at a predetermined position on the upper cover 10 (step S3 in FIG. 5). At this time, the stator 30 is only disposed on the upper cover 10 and is not fixed to the upper cover 10.

  Subsequently, a sheet (hereinafter referred to as a spacer) having a width w ′ that matches the interval w of the air gap P formed between the stator 30 and the magnet 30 shown in FIG. (Step S4 in FIG. 5).

  When the spacer is disposed, the magnet 50 on which the lens and the rotating body 51 are mounted is disposed in the groove 40a of the lower cover 40 so as to sandwich the spacer between the stator 30 (step S5 in FIG. 5). Since the stator 30 is made of metal, when the magnet 50 is inserted, the stator 30 may be attracted to and stuck to the magnet 50. In the present embodiment, since the spacer is disposed between the stator 30 and the stator 30, the stator 30 and the magnet 50 can be disposed at a uniform interval. The process of arranging the stator 30, the magnet 50, and the spacer in Step S3, Step S4, and Step S5 corresponds to an example of the arrangement process in the motor manufacturing method of the present invention.

  When the magnet 50 is disposed, the spring 24 is attached to the lower side of the lens (step S6 in FIG. 5).

  Subsequently, an adhesive is applied between the upper cover 10 and the stator 30 with a spacer interposed between the stator 30 and the magnet 50.

  Further, the pillar 11 of the upper cover 10 and the lower cover 40 are connected by screws 80, and the position of the stator 30 is determined (step S7 in FIG. 5).

  This state is maintained until the adhesive is dried and the upper cover 10 and the stator 30 are completely fixed (step S8 in FIG. 5). The process of fixing the upper cover 10 and the stator 30 in step S7 and step S8 corresponds to an example of a stator fixing process in the motor manufacturing method of the present invention.

  When the upper cover 10 and the stator 30 are completely fixed, the spacer is extracted from between the stator 30 and the magnet 50 (step S9 in FIG. 5). The process of extracting the spacer 80 in step S9 corresponds to an example of the spacer extracting process in the motor manufacturing method of the present invention.

  FIG. 6 is a cross-sectional view of the imaging apparatus 1 with a spacer inserted.

  When the upper cover 10 and the stator 30 are fixed, the spacer 80 is extracted from the hole 10 a provided in the upper cover 10. At this time, since the stator 30 is bonded to the upper cover 10 and the movement of the magnet 50 in the left-right direction is restricted by the groove 40a, the left-right direction of the stator 30 and the magnet 50 is removed even if the spacer 80 is removed. The position is maintained. Therefore, the stator 30 and the magnet 50 can be arranged with a uniform gap (interval w corresponding to the thickness w ′ of the spacer 80) over the entire circumference.

  In addition, by preparing the hole 10a of the upper cover 10, the spacer 80 can be extracted after the imaging apparatus 1 is assembled. The process of removing the lower cover 40, extracting the spacer 80, and reattaching the lower cover 40 is performed. Can be omitted.

  In the motor manufactured as described above, torque reduction is avoided by the uniform air gap P. By incorporating such a motor in the small imaging device 1, the lens can be driven smoothly. Can do.

  Here, in the above description, an example has been described in which the stator is first disposed on the upper cover, and the magnet is disposed after the spacer is disposed on the inner side of the stator. It may be a process of arranging the magnets first, or a process of arranging the spacers and magnets inside the stator and then arranging them together in the main body housing.

  Moreover, although the example which extracts a spacer from the hole provided in the upper cover was demonstrated above, the spacer extraction process said to this invention is, for example, after fixing a stator to an upper cover, removing a lower cover and extracting a spacer. It may be a process.

  Moreover, although the example which provides the groove | channel 40a which controls the position of the left-right direction of the magnet 50 and the rotary body 51 in the above was demonstrated, the positioning part said to this invention is provided in an upper cover, Also good.

  In the above description, the stepping motor that controls the rotation of the rotor by applying a pulse current to the stator has been described. However, the motor according to the present invention may be a DC motor or the like.

  In the above description, an example in which the direction of the force due to the rotational drive of the rotor is converted into a direction along the optical axis of the lens by the spiral groove and the spiral protrusion, the rotor according to the present invention is, for example, The direction of the force by rotational driving may be changed by a cam groove and a cam pin.

  In the above description, an example in which a motor is applied to realize the autofocus function has been described. However, a motor manufactured by the motor manufacturing method of the present invention is applied to realize a zoom function. May be.

1 is an external perspective view of an imaging apparatus to which an embodiment of the present invention is applied. It is sectional drawing when cut | disconnecting the imaging device 1 shown in FIG. 1 in the surface which passes along straight line AA '. It is a figure which shows the stator 30 and the magnet 50. FIG. 2 is an external perspective view of a lens holder 20. FIG. 3 is a flowchart illustrating an assembling method for assembling the imaging device 1. It is sectional drawing in the imaging device 1 in which the spacer was inserted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Imaging device 10 Upper cover 11 Pillar 20 Lens holder 201 1st part 202 2nd part 20a Spiral protrusion 20b Convex part 21 1st lens 22 2nd lens 23 3rd lens 30 Stator 30a Upper coil part 30b Lower coil part 31 Coil 32 Upper coil cover 33 Lower coil cover 32a, 33a Teeth 40 Lower cover 41 Low pass filter 50 Magnet 51 Rotating body 51a Spiral groove 60 CCD

Claims (3)

A stator having a cylindrical shape that forms a magnetic field in the cylindrical shape, and a cylindrical shape that is disposed at a predetermined distance in the cylindrical shape of the stator, and is formed on the stator by a magnetic field formed by the stator. In a motor manufacturing method for manufacturing a motor disposed in a main body housing having a positioning portion that physically contacts the rotor and determines a position of a rotation axis of the rotor,
A spacer having a thickness corresponding to the predetermined distance is disposed between the rotor and the stator, and the stator, the rotor, and the spacer are placed in the main body casing so that the rotor contacts the positioning portion. The placement process to place on the body,
A stator fixing process for fixing the stator to the main body housing;
A motor manufacturing method comprising: a spacer extracting process of extracting the spacer from the main body casing. The main body casing is provided with a hole in a part of a corresponding position between the stator and the rotor,
The motor manufacturing method according to claim 1, wherein the spacer extracting step is a step of extracting the spacer from a hole provided in the main body casing. A stator having a cylindrical shape that forms a magnetic field in the cylindrical shape, and a cylindrical shape that is disposed at a predetermined distance in the cylindrical shape of the stator, and is formed on the stator by a magnetic field formed by the stator. A rotor that is driven to rotate, and a lens positioned further inside the cylindrical shape of the rotor to hold the lens so that the optical axis is along the axis of the cylindrical shape. A main body housing including a lens holder that is driven in a direction along the shape axis, wherein the stator and the rotor are in physical contact with the rotor and determine a position of a rotation axis of the rotor. In the motor arranged in
A spacer having a thickness corresponding to the predetermined distance is disposed between the rotor and the stator, and the stator, the rotor, and the spacer are placed in the main body casing so that the rotor contacts the positioning portion. The placement process to place on the body,
A stator fixing process for fixing the stator to the main body housing;
The motor is manufactured through a spacer extracting process of extracting the spacer from the main body casing.

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