JPH0686529A - Driver and shutter driver for camera and lens-barrel driver for camera - Google Patents

Abstract

PURPOSE:To obtain a driver capable of directly driving an object to be driven without the necessity of a speed reducing mechanism, and capable of generating large driving force, by rotating circular output members successively in the same direction by the rotor of each power generating part. CONSTITUTION:The interlocking ring 13 of a device has a gear 13a in its peripheral part, and the gear 13a bites the gear 7b of a first rotor 7 and that 10b of a second rotor 10. When current is caused to flow in the second coil 12, and magnetic poles 11a and 11b of the second stator 11 are made N-pole and S-pole respectively, the second rotor 10 rotates counterclockwise by magnetic force. Interlocked with it, the interlocking ring 13 rotates clockwise and the first rotor 7 rotates counterclockwise. And the first rotor 7 and the second rotor 10 are at positions rotated counterclockwise by 90 deg.. Next, when the current is interrupted, and current is caused to flow in a first coil making the magnetic poles 8a and 8b of the first stator 8 S-pole and N-pole respectively, the first rotor 8 rotates counterclockwise by magnetic force. Interlocked with it, the interlocking ring 13 rotates clockwise and the second rotor 10 rotates counterclockwise. And the first rotor 7 and the second rotor 10 rotate counterclockwise by 90 deg..

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generator suitable for small precision equipment such as a camera, that is, a driving device, a shutter driving device for the camera, and a lens barrel driving device for the camera.

[0002]

2. Description of the Related Art Some recent cameras use a step motor as a driving source for driving a lens and as a driving source for a shutter and an aperture. For example, the conventional example disclosed in Japanese Utility Model Laid-Open No. 63-113127 is one such example. In the prior art disclosed in this publication, a flat step motor is arranged in the lens barrel of the camera, and the step motor is magnetized in the radial direction as shown in FIG. A rotor, a plurality of stators having a plurality of magnetic poles facing the outer circumference of the rotor, and a coil for exciting the stator, and these components are provided along the peripheral surface of the lens barrel. They are arranged in an arc shape. In FIG. 9, 1 is a circular lens barrel base plate,
Reference numeral 2 is a rotor rotatably attached to the lens barrel base plate 1 at the portion 2a.

For example, as shown in this figure, the rotor 2 is divided into four parts at a central angle of 90 ° with respect to the axial center, and S poles and N poles are alternately magnetized in the four divided regions. There is.

Numerals 3 and 4 are stators, and magnetic poles 3a, 3b, 4a and 4b facing the outer circumference of the rotor 2 are formed.

Reference numerals 5 and 6 are coils for exciting the stators 3 and 4. Then, the rotor is rotated by switching the energization of the coil, and the shutter blade or the photographing lens (not shown) is driven by the rotor.

[0006]

The above-mentioned conventional optical devices such as step motors and cameras have the following drawbacks.

(I) In the above step motor, the two magnetic poles 3a, 3b (4a, 4b) of each stator must be arranged at intervals along the radial direction of the lens barrel as shown in FIG. Therefore, the dimension A of the motor in the thickness direction cannot be reduced so much, and therefore the outer diameter D of the lens barrel cannot be reduced.

(Ii) Since the driving force generated by the step motor is weak and the index pitch of rotation of the step motor is large, it is necessary to use a speed reduction mechanism.
Not only does the equipment such as a camera become large due to the arrangement of the reduction gear mechanism and the reduction gear mechanism protrudes to the outside of the equipment to deteriorate the appearance of the equipment, but also the weight and cost of the equipment increases and power loss is reduced. Will lead to an increase.

Therefore, it is an object of the present invention to directly drive a driven body without requiring a reduction mechanism such as a gear train requiring a large space, and to have a driving force larger than that of a conventional lens barrel mounted step motor. To provide a drive device (or a power generation device) capable of generating power, and a drive device (power generation device) having a structure and a power generation principle suitable for mounting on a cylindrical device such as a lens barrel. It is to be.

[0010]

According to a first drive device of the present invention, at least two power generating units that generate step rotations with a predetermined time difference are arranged in an arc around one annular output member. , Each of the power generators is composed of a rotor magnetized to have two poles and a pair of magnetic poles arranged at positions opposite to each other with the rotor sandwiched therebetween. It is characterized in that the annular output member is configured to be rotationally driven in the same direction. In this drive device, since the magnetic poles of each power generation unit are only one pair arranged with the rotor interposed therebetween, the width of each stator can be reduced, and a lens barrel including the drive device of the present invention can be mounted. It does not increase the diameter of the device. Further, when the driving device of the present invention is mounted on a lens barrel or the like and used as a lens driving device, the annular output member can be directly connected to the rotary barrel in the lens barrel, and therefore a lens that does not need a speed reduction mechanism is required. A drive device can be realized.

On the other hand, the second drive device of the present invention comprises a fixed first ring and a first ring loosely fitted to the first ring so as to be able to roll along the inner peripheral surface of the first ring. 2 rings,
A plurality of biasing means arranged at predetermined intervals along the peripheral surface of the first ring and momentarily pressing the second ring against the inner peripheral surface of the first ring; The urging means are sequentially operated along the circumference of the first ring to move the second ring.
The ring is configured to rotate within the first ring.

The second driving device of the present invention is suitable as a built-in driving device for optical equipment and precision small equipment because it can drive a driven object without requiring any speed reducing means.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the driving device of the present invention will be described below with reference to the drawings.

1 to 7 show a first embodiment of the present invention.

Reference numeral 7 denotes a first rotor rotatably attached to a ground plate (not shown), and the magnetized portion 7a is made of a permanent magnet. The magnetization direction is the radial direction, and in this embodiment, the circumference is divided into two. 7a1 is a south pole and 7a2 is a north pole.

Reference numeral 8 is a first stator having magnetic pole portions 8a and 8b facing the magnetized portion 7a of the first rotor and attached to a ground plate (not shown).

Reference numeral 9 is a first coil for exciting the first stator 8.

Reference numeral 10 denotes a second rotor rotatably attached to a ground plate (not shown), and the magnetized portion 10a is made of a permanent magnet. The magnetization direction is the radial direction, and in this embodiment, the circumference is divided into two. 10a1 is S
It is a pole and 10a2 is a north pole.

Reference numeral 11 is a second stator having magnetic pole portions 11a and 11b facing the magnetized portion 10a of the second rotor and attached to a ground plate (not shown).

Reference numeral 12 is a second coil for exciting the second stator 11.

Reference numeral 13 denotes an interlocking ring rotatably attached to a ground plate (not shown). A gear portion 13a is formed on an outer peripheral portion of the base plate. The gear portion 7b of the first rotor 7 and the second rotor 10 are provided.
Is meshed with the gear portion 10b. As a result, the first rotor 7 and the second rotor 10 have a structure in which they rotate in conjunction with each other. The magnetized portion of the first rotor 7 is the magnetic pole portion 8 of the first stator 8.
The phase of the rotational position facing a and 8b differs from the phase of the rotational position where the magnetized part of the second rotor 10 faces the magnetic pole parts 11a and 11b of the second stator 11 by 90 ° as shown in FIG. Has been done.

The first rotor 7, the first stator 8 and the first coil 9 are constructed as shown in the sectional view of FIG.

Second rotor 10, second stator 11, second
The coil 12 has the same configuration. With such a configuration, the magnetic pole portion does not need to project outside or inside the rotor, and the A dimension described in the conventional example can be made small.

Next, the operation will be described.

From the state shown in FIG. 3, the second coil 12 is energized to make the magnetic pole portion 11a of the second stator 11 the N pole and the magnetic pole portion 11
b is the south pole. As a result, the second rotor 10 rotates counterclockwise due to the magnetic force. In conjunction with that, the interlocking ring 13 rotates clockwise,
The first rotor 7 rotates counterclockwise. The first rotor 7 and the second rotor 10 are rotated 90 ° counterclockwise. This state is shown in Figure 4.
Is the state of.

Next, the second coil 12 is de-energized from the state shown in FIG. 4, and the first coil 8 is energized to de-energize the first stator 8.
The magnetic pole portion 8a is set to the S pole and the magnetic pole portion 8b is set to the N pole. As a result, the first rotor 8 rotates counterclockwise due to the magnetic force. Interlocking with this, the interlocking ring 13 rotates clockwise and the second rotor 10 rotates counterclockwise. The first rotor 7 and the second rotor 10 are rotated 90 ° counterclockwise. This state is the state shown in FIG. In the same manner, the first coil is de-energized, the second coil is energized, and the magnetic pole portion 11a of the second stator 11 is the S pole and the magnetic pole portion 1
If 1b is made the N pole, it further rotates by 90 °, then the second coil is de-energized, and the first coil is energized.
If the magnetic pole portion 8a of the stator 8 is the N pole and the magnetic pole portion 8b is the S pole, the stator 8 further rotates 90 °, and the first rotor and the second rotor have made one rotation. By repeating this operation, the interlocking ring 13 rotates rightward little by little.

To rotate the interlocking ring 13 counterclockwise, energization is performed as follows.

From the state shown in FIG. 3, the second coil 12 is energized to make the magnetic pole portion 11a of the second stator 11 the S pole and the magnetic pole portion 11
b is the north pole. As a result, the second rotor 10 rotates clockwise due to the magnetic force. In conjunction with this, the interlocking ring 13 rotates counterclockwise and the first rotor 7 rotates clockwise. First rotor 7 and second
The rotor 10 is rotated 90 ° to the right.

Next, the power supply to the second coil 12 is cut off, and the first coil
The coil is energized to make the magnetic pole portion 8a of the first stator 8 an N pole and the magnetic pole portion 8b an S pole. As a result, the first rotor 8 rotates clockwise due to the magnetic force. Interlocking ring 1 linked to it
3 rotates left and the second rotor 10 rotates right. Therefore the first
The rotor 7 and the second rotor 10 are rotated 90 ° counterclockwise. If the first coil is de-energized and the second coil is de-energized in the same manner, and the magnetic pole portion 11a of the second stator 11 is the N pole and the magnetic pole portion 11b is the S pole, then the coil is further rotated by 90 °, and then the second coil is rotated. When the coil is de-energized, the first coil is energized, and the magnetic pole portion 8a of the first stator 8 is changed to the S pole and the magnetic pole portion 8b is changed to the N pole, the coil is further rotated by 90 °, and the first rotor and the second rotor are 1 It has rotated. By repeating this operation, the interlocking ring 13 rotates rightward little by little.

FIG. 6 shows an example of a driving device for the diaphragm blades and shutter blades using the step motor having the above-mentioned structure. A drive ring 14 rotates integrally with the interlocking ring 13.

Drive rings 14a, 14b and 14c are provided.
Drive pins fixedly attached to, and reference numerals 15, 16 and 17 denote shutter blades that also serve as apertures.

Reference numeral 18 is a holding base plate fixed to a base plate (not shown), and the shutter blades 15, 16 and 17 also used as apertures are on the holding base plate 18.

Reference numerals 18a, 18c and 18e are fulcrum pins fixed to the pressing base plate 18, and the shutter blades 15 also serve as the diaphragm.
The hole 15a is rotatably fitted to the fulcrum pin 18a, and the elongated hole 15b is slidably fitted to the drive pin 14a. The aperture / shutter blade 16 has a hole 16a rotatably fitted in the fulcrum pin 18c and an elongated hole 16b slidably fitted in the drive pin 14b. The aperture / shutter blade 17 has a hole 1
7a is rotatably fitted to the fulcrum pin 18e, and the long hole 17b
Is slidably fitted to the drive pin 14c. The long holes 18b, 18d, 18f of the holding base plate 18 are driven by the drive pin 14a,
It is an escape groove for preventing 14b and 14c from contacting each other. With this configuration, when the drive ring 14 rotates counterclockwise, the shutter blades 16, 17, 15 move the fulcrum pin 18a,
Rotate counterclockwise about 18c and 18e to form an opening. The opening area (opening diameter) is determined by the rotational position of the drive ring 14.

Reference numeral 19 is a blade pressing plate, which is a spacer projection 19
It is fixed to the pressing base plate 18 with a predetermined gap with the pressing base plate 18 by a and 19b. The shutter blades 15, 16 and 17 are located in the gap, and the gap is the amount necessary for the shutter blades 15, 16 and 17 to be movable.

FIG. 7 shows an example of a lens driving device using the driving device having the structure shown in FIG. A helicoid groove that engages with a helicoid of a lens barrel described later is formed in the inner diameter portion of the interlocking ring B. 20 is a lens barrel, and the helicoid part 20
a is formed. A groove 20c is formed on the arm 20b, and the groove 20c is formed by a pin 21 provided on a ground plate (not shown).
It is fitted with a sliding power so that the rotation of the lens barrel is stopped. Helicoid portion 20 of lens barrel 20
a and the helicoid groove of the interlocking ring 13 are engaged,
The rotation of the interlocking ring B moves the lens barrel in the optical axis direction. In this embodiment, the magnetized portion of the first rotor 7 and the magnetized portion of the second rotor 10 are magnetized in two parts, that is, magnetized every 180 °. The number of poles does not limit the present invention in any way. For example, in the case where the magnetized portion of the first rotor 7 and the magnetized portion of the second rotor 10 are magnetized such that the outer peripheral surface of the rotor is divided into four (that is, every 90 °), the S pole and the N pole alternate. The phase of the rotational position where the magnetized portion of the first rotor 7 faces the magnetic pole portions 8a and 8b of the first stator 8, and the magnetized portion of the second rotor 10 faces the magnetic pole portions 11a and 11b of the second stator 11. If the phase is different from the phase of the rotational position by 45 °, the first rotor 7 and the second rotor 10 can be rotationally driven by every 45 °. That is, in the case of using a rotor that is magnetized by being divided into n on the outer peripheral surface, if the rotor phase is configured to differ by 360 ° / 2n, the rotor can be rotationally driven every 360 ° / 2n.

FIG. 8 shows a second embodiment, in which the first rotor 7 and the second rotor 10 are coaxially arranged and are integrally rotated by the connecting shaft 22. As a result, the dimension B in the longitudinal direction of the step motor, that is, the dimension in the circumferential direction of the taking lens (not shown) becomes compact.

Next, an embodiment of another type of drive device according to the present invention will be described with reference to FIGS.

10 to 14 show a third embodiment of the present invention. FIG. 10 is a sectional view of a lens barrel in which the driving device of the present invention is used as a lens driving device.

1 is a rotating ring made of a magnetic material,
2 is a fixing ring. The outer diameter of the rotating ring 1 is φ
D ₁ , the inner diameter of the fixed ring 2 is φD ₂ , and the rotating ring 1 is arranged in the fixed ring 2. 3, 5,
Reference numerals 7 and 9 denote yokes fixed to the fixed ring 2 and are arranged on the circumference of the fixed ring 2 at substantially equal intervals. 4, 6,
Reference numerals 8 and 10 are coils for exciting the yokes 3, 5, 7, and 9. The yokes 3, 5, 7 and 9 are excitation parts 3a, 3b,
5a, 5b, 7a, 7b, 9a, 9b are opposed to the rotary ring 1. The yoke 3 and the coil 4 compose a first biasing means, the yoke 5 and the coil 6 compose a second biasing means, and the yoke 7 and the coil 8 compose a third biasing means. The yoke 9 and the coil 10 constitute a fourth biasing means.

Reference numeral 11 is a taking lens. As shown in FIG. 10, since the rotating ring 1 has a hollow shape, it does not block the optical path of the taking lens 11. 12 is a photographing lens 1
1 is a holding cylinder for holding the helicoid 12a on the outer peripheral portion.
Have. Further, an axial groove 12b is formed, the groove 12b and the pin 1a of the rotating ring 1 are slidably fitted together, and the rotating ring 1 and the holding barrel 12 are integrated with respect to rotation around the optical axis. It is designed to rotate.

13 has a helicoid 13a in its inner diameter,
It is a fixed ground plate fixed to the fixed ring 2. Fixed ground plate 1
The helicoid 13a of No. 3 is helicoidally coupled to the helicoid 12a of the holding cylinder 12 described above. The fixing ring 2
The fixed base plate 13 and the fixed base plate 13 may be formed of the same member. According to the above configuration, the taking lens 11 and the holding barrel 12 are moved in the optical axis direction by the rotation of the rotating ring 1 about the optical axis.

Next, the rotating operation of the rotating ring 1 will be described.

When the coil 4 is energized from the state shown in FIG. 11, the rotary ring is attracted by the yoke 3 of the first biasing means and the rotary ring 1 comes to a position where it abuts on the inner diameter portion of the fixed ring 2. This state is shown in FIG. When the coil 6 is further energized from the state shown in FIG. 12, the rotating ring 1 is attracted by the yoke 3 of the first urging means and the yoke 5 of the second urging means and rolls along the inner diameter portion of the fixed ring 2. It is configured to prevent slippage between the rotary ring 1 and the fixed ring 2 so as to come to the position indicated by 13.

Next, when the coil 4 is de-energized, it is attracted only by the yoke 5 of the second urging means, so the inner diameter of the fixed ring 2 rolls to the position shown in FIG.

Thereafter, similarly, (coil 6 energization) → (coils 6, 7 energization) → (coil 7 energization) → (coils 7, 8)
(Energization) → (coil 8 energization) → (coils 8 and 4 energization) →
(Coil 4 energized) → (Coil 4, 6 energized) → (Coil 6 energized)
When energized, the rotating ring 1 rotates around the optical axis while rolling on the inner diameter of the fixed ring 2. Suppose the rotating ring 1 rotates without slipping. The amount of rotation of the rotating ring 1 around the optical axis is the rotation angle required to change from the state of FIG. 12 to the state of FIG. 14 by D ₂ −D ₁
/ D ₁ × 90 °.

The reverse rotation of the rotary ring 1 may be carried out by reversing the above energization order. By changing the value of D ₂ -D ₁ , the indexing amount of rotation of the rotary ring 1 can be set arbitrarily, and a large rotational driving force can be taken out by a slight biasing force of the biasing means, so that the lens 11 and No other reduction mechanism is required for driving the holding barrel 12, and a compact lens barrel can be obtained.

In this embodiment, the electromagnet device is used as the urging means, but an electrostatic force or an electromagnetic force may be used.

FIG. 24 shows an embodiment in which the shutter blades or diaphragm blades are driven by a rotating ring.

The rotary ring 101 is driven in the same manner as in the third embodiment, and the drive pins 101a, 101b, 101c are fixed.

Reference numerals 115, 116 and 117 denote shutter blades that also serve as diaphragms.

Reference numeral 118 denotes a holding base plate fixed to a base plate (not shown), and shutter blades 115, 116, 11 also serving as diaphragms.
7 is on the holding base plate 118. 118a, 118
Numerals c and 118e are fulcrum pins fixed to the pressing base plate 118. In the aperture / shutter blade 115, the hole 115a is rotatably fitted to the fulcrum pin 118a, and the elongated hole 115b is slidably fitted to the drive pin 101a. I am fit. In the aperture / shutter blade 116, the hole 116a is rotatably fitted to the fulcrum pin 118c, and the elongated hole 116b is slidably fitted to the drive pin 101b. In the aperture / shutter blade 117, a hole 117a is rotatably fitted in the fulcrum pin 118e, and a long hole 117b is slidably fitted in the drive pin 101c. Long holes 118b, 118d, 118 of the holding base plate 118
Symbol f is an escape groove for preventing the drive pins 101a, 101b, 101c from coming into contact with each other. With this configuration, when the rotary ring 101 rotates counterclockwise, the shutter blades 11
6, 117, 115 are fulcrum pins 118a, 118c, 1
18e is rotated counterclockwise about the rotation center to form an opening. The opening area (opening diameter) depending on the rotating position of the rotating ring 101
Will be decided.

Reference numeral 119 denotes a blade pressing plate, which is a spacer protrusion 1
It is fixed to the pressing base plate 118 by 19a and 119b so as to have a predetermined gap with the pressing base plate 118. The shutter blades 115, 116, 117 are located in the gap, and the gap is the amount necessary for the shutter blades 115, 116, 117 to move.

Next, a fourth embodiment in which the above embodiment is further improved will be described with reference to FIG.

FIG. 15 shows a modification of the embodiment shown in FIG. 10, in which the permanent magnets 14, 15, 16, 17 are incorporated in the same yokes 3, 5, 7, 9 as in FIG. According to this, when all the coils are de-energized, the rotating ring 1 is attracted and held by any of the permanent magnets 14, 15, 16 and 17. When the rotating ring 1 is driven, if the current is selectively passed through the coils 4, 6, 8 and 10 so as to cancel the magnetic force of the permanent magnets, the rotating ring 1 is attracted by the biasing means that does not pass the current. As described in the example, the inner diameter portion of the fixing ring 2 can be rolled. The advantage of this embodiment is that the rotating ring 1 is held by the closest urging means at that time, that is, the permanent magnet, even when the coil is not energized, and is used for the purpose of stably fixing the rotating ring 1 for a long time. Suitable for the case.

However, in the above-mentioned embodiment, in order to always smoothly rotate the rotating ring 1 in the fixed ring 2, it is necessary to design based on the following mechanical analysis. The movement of the rotary ring 1 in the above embodiment will be described below, as well as a modified embodiment in which the above embodiment is further improved.

In the lens driving device shown in FIG. 10, since the pin 1a of the rotary ring 1 is connected to the holding cylinder 12 inside the inner diameter portion φD ₂ of the fixed ring 2, the locus of the pin 1a is as shown in FIG. become. The pin 1a finally rotates to the left (or to the right), but as shown by an arrow B, there is a position where it reverses in the middle. This is a force that acts to stop the rotation when the holding cylinder 12 is continuously rotated, and each time an impact force is applied to the holding cylinder to cause vibration or noise or to quickly drive the holding cylinder. It becomes an obstacle to. Further, when a rotating ring that rotates instead of the holding cylinder 12 is provided and the shutter blade and the diaphragm blade are moved by this rotating ring, the blade may move in the closing direction in the process of opening the opening and The blade may move in the opening direction during the closing operation.
That is, the position of the rotating ring 1 and the rotating position of the rotating ring are not uniquely determined. Therefore, it becomes difficult to control the opening amount.

Therefore, in the fifth embodiment of the present invention, the following improvements are made to the structure of the third embodiment based on the above consideration. That is, in the fifth embodiment of the present invention, the outer periphery of the rotary ring, which is in contact with the inner diameter of the fixed ring, prevents slippage or causes a high frictional force in the first range and does not prevent slippage. A second range in which only a low frictional force is generated is provided.

A fifth embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 16, in the present embodiment, a friction surface 1b having a large friction coefficient and a sliding surface 1c having a small friction coefficient are provided on the outer peripheral surface of the rotating ring 1, that is, on the surface contacting the hollow inner diameter portion of the fixed ring 2. Has been formed. As the friction surface 1b, a method of roughening the surface roughness or a method of sticking a rubber sheet can be considered.

The boundary between the friction surface 1b and the sliding surface 1c is P
₁ and P ₂ . FIG. 17 shows a rotating ring 1 and a fixed ring 2.
FIG. 4 is a plan view showing the relationship between the pin 1a and the rotary ring 1 rolling in the direction of arrow C without rolling on the inner peripheral surface of the fixed ring 2 and moving in the direction of arrow D, and the pin 1a moves along the locus of the chain double-dashed line in the figure. To go. As a result, the pin 1a rotates rightward about the center of the inner diameter portion of the fixed ring 2, but rotates in the opposite direction from point E to point F, that is, to the left. Pin 1a sets the position of P ₁ to P ₁ point of the rotating ring 1 as shown in FIG. 17 is a position which comes to the position of point E is in contact with the inner diameter portion of the stationary ring 2, and pin 1a is F point At the position where it comes to the position, P ₂ point of the rotating ring 1 touches the inner diameter part of the fixed ring 2
Set the position of ₂ . With this setting, P ₁ to P
Up to ₂ , the sliding surface 1c, which has a small coefficient of friction, contacts the inner diameter of the fixed ring 2, so even if the rotating ring 1 rotates in the direction of arrow C, almost no force is required to drive the pin 1a from point E to point F. Does not occur. Therefore, the position of the pin 1a changes from the state of FIG. 17 to that of FIG. 18 as the arrow C of the rotary ring 1 rotates.
18 to FIG. 19.

The position of the pin 1a in FIG. 17 is shown by the dotted line in FIG.

The position of the pin 1a in FIG. 18 is shown by the dotted line in FIG. 19, and the locus of the pin 1a is shown by the chain double-dashed line.

In FIG. 20, a curve G shows the locus of the pin 1a with respect to the fixed ring 2. Since the pin 1a rotates in the inner diameter portion of the fixed ring 2 without being reversed in the middle, vibration and noise are reduced when the lens barrel is driven. Further, when the shutter blade is used for opening and closing, the shutter blade does not move in the opposite direction during opening or closing, so that control of the opening amount of the shutter blade becomes simple.

21 and 22 show a sixth embodiment. In this embodiment, an engaging portion between the rotary ring 1 and a holding cylinder 12 which is a member rotationally driven by the rotary ring 1, that is, a pin 1a and a groove 12 is provided.
The engagement position with b is arranged outside the outer peripheral portion of the rotary ring which comes into contact with the fixed ring. The sectional view is shown in FIG. In the figure, the relation between r ₁ and D ₁ is 2r ₁ > D ₁
Have a relationship. The locus of movement of the pin 1a is shown by a curve H in FIG. As can be seen from this figure, the pin 1a does not move in the opposite direction during the rotational movement around the optical axis.

[0064]

(I) As described with reference to FIGS. 1 to 8,
The first drive device of the present invention has two rotors, and by connecting the Λ phase with respect to those stators while shifting them by a half of the magnetizing pitch, the planar size occupied by the step motor becomes small, and therefore, the present invention provides The blade drive device or the lens drive device using the drive device can be made compact.

(Ii) As described with reference to FIGS. 10 to 15, the second drive device of the present invention has a hollow cylindrical rotating ring and a cylindrical inner diameter portion, and the rotating ring is provided in the inner diameter portion. The arranged fixed ring can be switched between a first state in which the rotating ring is urged toward the inner diameter portion of the fixed ring and a second state in which the urging is released, and the fixed ring has substantially equal intervals on the circumference of the fixed ring. And at least three urging means disposed in the actuator, capable of giving a fine feed motion to the driven object without a reduction mechanism and generating a small driving force. A large driving force can be obtained. As a result, in an optical device using the driving device of the present invention as a lens driving device, the lens barrel can be made compact while maintaining a cylindrical shape.

(Iii) As described with reference to FIGS. 15 to 23, the drive device of the present invention is provided with the first range for preventing slippage and the second range for producing low friction on the outer peripheral portion of the rotary ring. Alternatively, by disposing the engaging portion of the rotary ring and the member rotationally driven by the rotary ring outside the outer peripheral portion of the rotary ring that contacts the fixed ring, a member rotationally driven by the rotary ring (for example, a photographing lens). It is possible to prevent the generation of force that acts to stop the rotation of the holding cylinder and the ring that opens and closes the shutter blades, or to temporarily move in the opposite direction, reducing vibration and noise. In addition, the movement amount of the rotationally driven member can be easily controlled.

[Brief description of drawings]

FIG. 1 is a perspective view of a drive device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a step motor unit of the drive device shown in FIG.

FIG. 3 is a plan view showing an operating state of the driving device of the present invention.

FIG. 4 is a plan view showing an operating state of the driving device of the present invention.

FIG. 5 is a plan view showing an operating state of the driving device of the present invention.

FIG. 6 is a perspective view of an aperture / shutter device that uses the driving device of FIG.

7 is a perspective view showing a main part of a lens driving device using the driving device of FIG.

FIG. 8 is a perspective view of the second embodiment.

FIG. 9 is a plan view of a conventional example.

FIG. 10 is a sectional view of a lens driving device including a driving device according to a third embodiment of the present invention.

11 is a plan view showing the operation of the lens driving device shown in FIG.

12 is a plan view showing the operation of the lens driving device shown in FIG.

13 is a plan view showing the operation of the lens driving device shown in FIG.

14 is a plan view showing the operation of the lens driving device shown in FIG.

FIG. 15 is a plan view of a driving device according to a fourth embodiment of the present invention.

FIG. 16 is a perspective view of a rotary ring equipped in a driving device according to a fifth embodiment of the present invention.

FIG. 17 is a diagram showing a movement trajectory of the pin 1a of the rotating ring in FIG.

FIG. 18 is a diagram showing a movement trajectory of the pin 1a of the rotating ring in FIG.

FIG. 19 is a diagram showing a movement trajectory of the pin 1a of the rotating ring of FIG.

20 is a diagram showing a movement locus of the pin 1a of the rotating ring of FIG.

FIG. 21 is a sectional view of a sixth embodiment of the present invention.

22 is a diagram showing the locus of movement of the pins of the rotary ring of the apparatus shown in FIG.

23 is a diagram showing a locus of movement of a pin of a rotating ring of the apparatus shown in FIG.

FIG. 24 is a diagram showing a modification of the fourth embodiment.

[Explanation of symbols]

(FIGS. 1-9) 7 ... 1st rotor 8 ... 1st stator 9 ... 1st coil 10 ... 2nd rotor 11 ... 2nd stator 12 ... 2nd coil 13 ... Interlocking ring (FIGS. 10-15) 1 ... Rotating ring 2 ... Fixed ring 3, 5, 7, 9 ... Yoke 4, 6, 8, 10 ...
Coil 11 ... Photographic lens 12 ... Holding cylinder 13 ... Fixed base plate (FIGS. 16 to 23) 1 ... Rotating ring 1a ... Pin 2 ... Fixing ring 3, 5, 7, 9, ... Yoke 4, 6, 8, 10 ... Coil 11 ... Photographing lens 12 ... Holding tube 12b ... Groove 13 ... Fixed ground plate 16 ... Friction surface 1c ... Sliding surface

Claims (10)

[Claims] 1. A cylindrically-shaped first rotor and a second rotor that are magnetized in a radial direction, and a first stator having two magnetic pole portions facing the outer peripheral surface of the first rotor. ,
A second stator having two magnetic pole portions facing the outer peripheral surface of the second rotor, a first coil that excites the first stator, and a second coil that excites the second stator. A magnetizing part of the first rotor, which comprises a coil and an interlocking output means driven by the first rotor and the second rotor, and which opposes the magnetic pole part of the first stator. And a rotational phase of a magnetized portion of the second rotor facing the magnetic pole portion of the second stator are different from each other by an angle of half the magnetized pitch of the rotor. . 2. The interlocking output means is an annular member or a circular member, and the first rotor, the first stator, and the first coil are arranged in an arc shape along the outer periphery of the interlocking output means. The drive device according to claim 1, wherein the second rotor, the second stator, and the second coil are arranged in an arc shape along the outer periphery of the interlocking output means. 3. The drive device according to claim 1, wherein the first rotor and the second rotor are fixed to the same shaft. 4. A fixed first ring, a second ring loosely fitted to the first ring so as to rotate along an inner peripheral surface of the first ring, and a circumference of the first ring. A plurality of biasing means which are arranged at a predetermined interval along the same time and momentarily press-contact the second ring to a point on the inner peripheral surface of the first ring;
And sequentially moving the plurality of biasing means along the circumference of the first ring to move the second ring along the inner peripheral surface of the first ring. A drive configured to rotate the second ring. 5. The drive device according to claim 4, wherein a first region having a high friction coefficient and a second region having a low friction coefficient are formed on the outer peripheral surface of the second ring. 6. An engaging portion that integrates the driven member rotationally driven by the second ring with the driven member only in the rotation direction protrudes from one end surface of the second ring. The drive device according to claim 4, wherein the drive device is provided. 7. A shutter device comprising: the driving device according to claim 1, 2 or 3; and a shutter blade or an aperture blade, wherein the interlocking output means drives the shutter blade or the aperture blade. 8. The drive device according to claim 1, 2 or 3, and a taking lens barrel, wherein the taking lens barrel is moved in the optical axis direction by the interlocking output means. Lens drive device. 9. The drive device according to claim 4, 5 or 6, wherein the second ring has a hollow shape, a lens having a hollow portion of the second ring as an optical path, and a lens for holding the lens. A lens holding cylinder integrally connected to the second ring in the rotational direction and having a helicoid on the outer peripheral portion, a helicoid of the lens holding cylinder on the inner periphery, and a fixed base plate having a helicoid portion for helicoid coupling. Lens barrel characterized by. 10. A shutter device comprising the drive device according to claim 4, 5 or 6, and a shutter blade or a diaphragm blade, wherein the shutter blade or the diaphragm blade is driven by the second ring.