JP2999998B1 - Actuator and camera shutter using the same - Google Patents

Abstract

Kind Code: A1 An actuator which has a plurality of rotors arranged at close positions and can be individually controlled, which is advantageous in terms of cost and space, and a camera shutter using the actuator. To provide. A rotor (11, 12) is supported by a base frame (9) and a cover frame (10) constituting a stator frame, and integrally has output pins (21a, 22a) at radial positions of a rotating shaft. . The shutter blades are reciprocated by the reciprocating rotation of the rotor 11, and the aperture blades are reciprocated by the reciprocating rotation of the rotor 12. Rotor 11, 1
2 has two poles and the same magnetization direction, so that it can be magnetized simultaneously in the assembled state. Coil 13, 14
Is wound around the stator frame so as to surround the bearing portion for each rotor. However, since the winding axis is common and the winding direction is the same, the winding process is performed by rotating the stator frame on the X axis. It can be done at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator of the type generally referred to as a moving magnet type motor in which a rotor made of a permanent magnet is reciprocated only within a predetermined angle range. The present invention relates to an actuator having a plurality of rotators and capable of individually rotating them, and a camera shutter using the actuator.

[0002]

2. Description of the Related Art An actuator called a moving magnet type motor rotates a rotor by a predetermined angle in a forward direction when a current is applied to a coil of a stator in a forward direction, and a predetermined angle when a current is applied in a reverse direction. , The output pin rotating integrally with the rotor drives the driven member. Compared to a stepping motor, this actuator has the advantage that the control system is simpler and is suitable for cost reduction and miniaturization, but it is inferior in starting performance and driving force and can perform complicated rotation control. For this reason, it is advantageous to use it mainly in precision equipment, toys, locking devices, and the like when it is required to be relatively compact and a small load is required.

There are mainly two types of actuator configurations. The first one is disclosed in
As described in JP-A-148869 or the like, the coil of the stator is moved with respect to the frame supporting the rotor.
It is wound so as to surround the bearing, and the second
As described in Japanese Patent Laid-Open No. 10-68980, a coil is wound around a magnetic pole member of a stator,
The magnetic pole portion of the magnetic pole member is arranged so as to face the peripheral surface of the rotor. Usually, these rotors are magnetized to two or four poles. The configuration of the actuator of the present invention belongs to the first type of configuration.

Incidentally, among various products, there are cases in which a plurality of driven members located close to each other are desired to be driven by individual actuators. For example, in a camera shutter, a shutter blade is driven by one actuator and a diaphragm blade is driven by another actuator, or in a locking device, a plurality of lock members are provided, and they are sequentially released. For example, the user may want to be able to unlock when all are released. In such a case, conventionally, individually manufactured actuators have been assembled to the device one by one.

[0005]

As described above, an actuator called a moving magnet type motor is an actuator that is advantageous in reducing cost and size. However, when a plurality of individually controllable actuators are mounted on one device, the number of mounting portions on the device increases in proportion to the number of actuators.
If the rotor is arranged at a close position, the rotor may not be assembled in a predetermined space, and the degree of contributing to miniaturization of the device may be reduced. In such a case, if several actuators having different shapes of the mounting portion are prepared and used in combination,
In some cases, multiple rotors can be placed close to each other in a limited space, but this would increase the cost and reduce the degree to which the cost of the device could be reduced. Would. Therefore, even when assembling a plurality of rotors in close proximity to each other, the advantages of cost reduction and miniaturization of this type of actuator are not impaired, but rather, cost and space are more advantageous. It is desired to realize such an actuator.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to arrange a plurality of rotors at close positions and control them individually. An object of the present invention is to provide an actuator which is advantageous in terms of cost and space, and a camera shutter using the actuator.

[0007]

In order to achieve the above purpose SUMMARY OF THE INVENTION The actuator of the present invention, our common stator frame
Kicking plurality of permanent magnetized in the two poles are formed integrally with the output pins extending parallel to the rotation axis in the radial position of the respective rotary shafts are journalled in the parallel respective rotation axis proximate position A magnet rotor and a plurality of coils wound around the common stator frame so as to surround two bearing portions for each rotor, and each coil has its winding axis on the common axis So that the winding directions of the coils are the same. Also,
To achieve the purpose, the actuator of the present invention,
Parallel respective rotation axis proximate position definitive common stator frame
A plurality of permanent magnets made of a rotor which is magnetized in two poles, which are provided integrally with the output pins extending parallel to the rotation axis in the radial position of the respective rotary shafts are journalled in the, each rotor A plurality of coils wound around the common stator frame so as to surround two bearing portions for each rotor.
Indicates that the boundaries of the magnetic poles on each
So that they can be aligned on the same side of each
Polarity may be all are arranged in the so that a same polarity. Furthermore, in order to achieve the above purpose,
The actuator of the present invention, near the definitive common stator frame
A plurality of permanent magnets magnetized in two poles, which are provided integrally with the output pins extending parallel to the rotation axis in the radial position of the respective rotary shafts are journalled in the parallel respective rotation axis contacting position And a plurality of coils wound around the common stator frame so as to surround two bearings for each rotor, and each coil has its winding axis on the common axis. And the winding direction of each coil is the same, and each rotor is
The pole boundaries can be aligned in the same direction,
The may be the polarity of the same side of the boundary line are all disposed on so that a same polarity. Further, in each actuator of the present invention as described above, the common stator frame includes a common base frame that performs one bearing of each rotor, and a common cover frame that performs the other bearing of each rotor. It is advantageous in the case of manufacturing if it is constituted by. Change
In each actuator of the present invention as described above,
The two stators are supported on the common stator frame, and the actuators are mounted on a shutter base plate. The output pin of one rotor drives a shutter blade, and the output pin of the other rotor is an aperture blade. , A low-cost camera shutter can be obtained. In this case, even if the output pin of one rotor drives a shutter blade and the output pin of the other rotor drives a lens in the optical axis direction, a low-cost camera shutter is similarly formed. It is possible to obtain.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to a first embodiment shown in FIGS. 1 to 6 and a second embodiment shown in FIGS. In each of these embodiments, an actuator having two rotors (referred to as a twin actuator) is applied to a digital camera. In the first embodiment, a shutter is operated by one of the rotors. The blades are driven, and the diaphragm blades are driven by the other rotor. In the second embodiment, the shutter blades are driven by one rotor, and the lens is driven by the other rotor. It was done.

First Embodiment First, the structure of the first embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a plan view showing a stationary state before photographing as viewed from the subject side. , FIG. 2
FIG. 3 is a sectional view of a main part of FIG. 1, and FIG. 3 is a plan view of FIG. 1 with an actuator removed. As can be seen from FIG. 2, in this embodiment, the shutter base plate 1, the intermediate plate 2, and the auxiliary base plate 3 are arranged so as to have a predetermined space in order from the subject side, and the intermediate plate 2 and the auxiliary base plate 3 , Is fixed to the shutter base plate 1 by appropriate means not shown. The space between the shutter base plate 1 and the intermediate plate 2 is a shutter chamber, and the space between the intermediate plate 2 and the auxiliary base plate 3 is a diaphragm chamber. As shown in FIG. 1, the shutter base plate 1 has a circular opening 1a at a substantially central portion. Openings (not shown) are also formed in the intermediate plate 2 and the auxiliary base plate 3, but in this embodiment, the shutter base plate 1
Is an exposure opening.

The shutter base plate 1 is made of synthetic resin,
On the rear side of FIG. 3, that is, on the lower side of FIG.
d. The shutter blades 4 and 5 are rotatably mounted on the shafts 1b and 1c.
By inserting the tips of the shafts 1b and 1c into the holes of the intermediate plate 2, the shutter blades 4 and 5 are prevented from coming off the shafts 1b and 1c. The shaft 1d extends through a hole formed in the intermediate plate 2, and rotatably mounts a diaphragm blade 6 in the diaphragm chamber. Then, the tip is inserted into a hole formed in the auxiliary base plate 3 so that the diaphragm blade 6 does not come off the shaft 1d. Further, the aperture blade 6 is formed with an opening 6a having a smaller diameter than the above-mentioned opening 1a.

On the subject side of the shutter base plate 1, that is, on the upper side in FIG. 2, two mounting portions 1e and 1f having screw holes are provided.
8 attached. The stator frame of the actuator is composed of a base frame 9 made of synthetic resin and a cover frame 10, and a flexible hook portion 10 a provided on the cover frame 10 is hooked on the base frame 9 to form the both. Can be integrated with each other.
Attachment to e and 1f is performed by inserting screws 7 and 8 into holes formed in the base frame 9. Although a plurality of hook portions 10a are actually provided, FIG. 2 shows only one of them.

The cover frame 10 has two cylindrical portions 10b, 1
0c are provided, and the rotor 11,
12 are accommodated. These rotors 11 and 12 are made of permanent magnets, respectively, and are supported by a base frame 9 and a cover frame 10, and coils 13 and 14 are wound around the respective two bearings. . The coils 13 and 14 have their respective winding axes on a common axis, and the winding directions of the coils are the same. That is, the coils 13 and 14 are wound around an axis X indicated by a two-dot chain line in FIGS. 1 and 2, and the winding direction is the right side in FIGS. 1 and 2 in the case of the present embodiment. It is wound counterclockwise when viewed from above.

The cylindrical portions 10b and 10c of the cover frame 10 have
After winding the coils 13 and 14 as described above, the cylindrical yokes 15 and 16 are fitted. As shown in FIG. 1, two rod-shaped magnetic members 17 and 18 are press-fitted into the cylindrical portion 10b so as to be parallel to the rotation axis of the rotor 11. Two rod-shaped magnetic members 19 and 20 are similarly press-fitted into the portion 10c. Further, the rotors 11 and 12 of this embodiment are both magnetized to two poles, and are arranged so that their magnetizing directions are the same. That is, in FIG. 1, the boundary line of the magnetic pole is indicated by a solid line for convenience, but the opening 1a side (upper side in FIG. 1) is the N pole and the opposite side (lower side in FIG. 1). Side) is the south pole.

The rotors 11 and 12 are integrally formed with drive arms 21 and 22 made of synthetic resin by molding. The drive arms 21 and 22 project radially from the rotation shafts of the rotors 11 and 12, and have output pins 21a and 22a at their ends extending parallel to the rotation shafts. The output pin 21a of the drive arm 21 passes through the long hole 9a formed in the base frame 9 and the long hole 1g formed in the shutter base plate 1, and the shutter blades 4, 5 have the long holes 4a.
a, 5a. The shape of the long hole 1g is shown in FIG.
, The long hole 9a also has the same shape, and both are arranged so as to overlap. The two end faces in the longitudinal direction regulate the operating angle of the output pin 21a.

On the other hand, the output pin 22a of the drive arm 22
Penetrates the long hole 9b of the base frame 9 and the long hole 1h of the shutter base plate 1 and fits into the long hole 6b of the diaphragm blade 6. Also,
The elongated hole 9b has the same shape as the elongated hole 1h shown in FIG.
The two end faces in the longitudinal direction of the elongated holes 1h and 9b are arranged so as to overlap with the elongated hole 1h.
The operating angle of a is regulated. In addition, FIG.
As described above, since the actuator is removed from the shutter base plate 1 in a plan view, the output pins 21a and 22a should not be shown. It is shown for the sake of convenience in order to facilitate understanding of the relationship with the aperture blade 6. This is the same for FIGS. 4 to 6.

Here, a method of manufacturing the actuator according to the present embodiment will be described. As can be seen from the above description of the configuration, in the present embodiment, the stators are not prepared for the two rotors 11 and 12, and the common configuration including the base frame 9 and the cover frame 10 is not provided. Is provided. This is the same even if there are three or more rotors. For this reason, the number of parts can be reduced and the manufacturing cost can be reduced as compared with a case where a stator frame is prepared for each rotor. In addition, since the number of mounting portions for the shutter base plate 1 can be reduced, the mounting space can be small, and it is possible to contribute to downsizing and downsizing of the shutter.

Therefore, first, the cylindrical portion 10 of the cover frame 10 is
The rotors 11 and 12 are housed in b and 10c, respectively, and one end of each of the rotating shafts is supported by the cover frame 10. In this case, the rotors 11 and 12 are not yet magnetized into two poles. After that, the other end of each rotating shaft of the rotors 11 and 12 is supported by the base frame 9, and the base frame 9 and the cover frame 10 are integrated by the hook 10 a. After assembling the rotors 11 and 12 in this way, windings are wound around the assembly to form the coils 13 and 14, and the winding process is performed simultaneously by one winding machine. That is, first, the assembly is mounted on a winding machine so as to be rotatable about the axis X, and one end of each of the wires drawn from different bobbins is fixed to a stator frame. The solid is wound by rotating clockwise as viewed from the right in FIGS. Therefore, the two coils 13, 1
4 makes the winding process more efficient than in the case where
The cost can be reduced.

Next, in the magnetizing device, the rotor 11,
12 will be magnetized, but the magnetization process
As shown by the arrow in FIG. 1, the process is performed by exposing the rotors 11 and 12 to a strong magnetic field having a magnetic field in a direction perpendicular to the rotation axis. In that case, the rotors 11 and 12
Since the magnets are given directionality when magnetized in advance, they can be automatically set by a strong magnetic field when magnetized, even if the rotating positions of the rotors 11 and 12 are not exactly aligned when they are put into a magnetizing device. It is designed to be positioned.

As described above, according to this embodiment, after the two rotors 11 and 12 have been assembled in advance to the common stator frame,
Since it is possible to simultaneously magnetize them, it is easier to handle the rotors 11 and 12 in the manufacturing process than when the magnets are individually magnetized and then assembled to the stator frame. Thus, cost reduction is possible.
That is, according to the present embodiment, there is an advantage that the two rotors can be handled together when moving the rotor in and out of the magnetizing device. Also, when magnetized individually in advance, various fine objects are easily attached, and management until assembly to the stator frame is troublesome, but in the case of the present embodiment, assembly is performed within the stator frame. Since it is magnetized after that, its management becomes relatively easy. In addition, this magnetizing step may be used as a pre-step of the above-described winding step. However, as described above, after magnetized, a fine object tends to adhere, so it is preferable to perform the post-process as much as possible.

Next, the rod-shaped magnetic members 17, 18, 1
2 are inserted into holes formed in the cover frame 10 from above in FIG. Then, the cylindrical yokes 15, 16 are connected to the cylindrical portions 10b, 10c of the cover frame 10.
2 are fitted downward from above in FIG. 2 to complete the twin actuator of this embodiment. The magnetic member 1
It has been confirmed that the assembly of the yoke 15, 16 with the 7, 18, 19, 20 and the yoke 15, 16 does not cause any particular trouble even if performed before the magnetizing step. Order is preferred. Also, the magnetic members 17, 18, 1
There is no particular problem in assembling the components 9 and 20 even before the winding process.

Next, the operation of this embodiment will be described. FIGS. 1 and 3 show a stationary state before photographing, but here, in particular, the camera is in an unused state. Therefore, the power switch of the camera is turned off, the image monitor is not functioning, and the coils 13 and 14 are not energized. In this state, S
Since the magnetic force acting between the pole (the lower magnetic pole in FIG. 1) and the magnetic member 17 is larger than the magnetic force acting between the N pole and the magnetic member 18, the rotor 11 is turned counterclockwise. A rotating urging force is applied. However, as shown in FIG. 3, the rotation is prevented by the output pin 21a abutting on the lower end surface of the elongated hole 1g, and the shutter blades 4, 5 are kept in the fully opened state.

On the other hand, in this state, the magnetic force acting between the N pole (the upper magnetic pole in FIG. 1) of the rotor 12 and the magnetic member 20 acts between the S pole and the magnetic member 19. Since it is larger than the magnetic force, the rotor 12 is provided with an urging force that rotates clockwise. However, as shown in FIG. 3, the output pin 22a is prevented from rotating by contacting the upper end surface of the elongated hole 1h. At this time, the aperture blade 6 keeps a state of being rotated counterclockwise on the shaft 1d, and the opening 1a is fully opened.

When the power switch of the camera is closed prior to photographing, the image pickup device is turned on and the accumulation and release of electric charge are repeated. Therefore, the subject can be observed on the image monitor. However, in this state, the coils 13 and 14 are not energized yet, and the shutter blades 4 and 5 and the aperture blade 6 maintain the opening 1a in the fully opened state. After that, when the release button is pressed at the time of photographing, it is determined whether to perform photographing in the fully opened state or to perform photographing in the small aperture state using the aperture 6a of the aperture blade 6 according to the output signal of the image sensor at that time. And
In addition, the exposure time is determined.

First, a case in which the subject is relatively dark and shooting is performed in this fully opened state will be described. In this case, photographing is immediately started with the charge accumulation start signal for the image sensor as a trigger signal. That is, the exposure time control circuit is activated by the trigger signal, and the counting of seconds corresponding to the exposure time is started. When the counting is completed, the coil 1
3 is energized in the positive direction. Therefore, the rotor 11 is rotated clockwise from the state shown in FIG. 1, and causes the shutter blades 4 and 5 to perform the closing operation by the output pin 21a. Then, after the shutter blades 4 and 5 close the opening 1a, the closing operation stops when the output pin 21a contacts the upper end surface of the elongated hole 1g.

When this closed state is reached, in this embodiment, the power supply to the coil 13 is cut off. However, at this time, even if the energization is cut off, the magnetic force acting between the N pole (the upper magnetic pole in FIG. 1) of the rotor 11 and the magnetic member 18 causes the magnetic force acting between the S pole and the magnetic member 17 to change. Since the magnetic force acting on the rotor 11 is larger than the magnetic force acting on the rotor 11, a biasing force that rotates clockwise is applied to the rotor 11, and this state is maintained. If power saving is not considered, energization may be continued, but in that case, the magnetic member 18 becomes unnecessary. Then, in this closed state, the subject image is stored in the storage medium via the image writing device or the like, and when this is completed, the coil 13 is energized in the reverse direction. Therefore, the rotor 11 is rotated in the counterclockwise direction, and the output pin 21a causes the shutter blades 4 and 5 to open, and returns to the state shown in FIGS.
Thereafter, the energization of the coil 13 is stopped, and the camera is ready for the next photographing.

Next, a description will be given of a case where an image is taken using the aperture 6a of the aperture blade 6 because the subject is relatively bright, with reference to FIGS. The operation description will be briefly described. First, in this case, the coil 14 is energized in the reverse direction. In this case, since the winding direction of the coil 14 is the same as that of the coil 13, the rotor 12 is rotated counterclockwise, and the aperture blade 6 is rotated clockwise by the output pin 22a. FIG. 4 shows a state where the output pin 22a comes into contact with the lower end surface of the elongated hole 1h and stops, and the exposure opening is regulated by the opening 6a. In this state, energization of the coil 14 is cut off. However, the magnetic force acting between the S pole (the lower magnetic pole in FIG. 1) of the rotor 12 and the magnetic member 19 becomes N pole and the magnetic member 20 is greater than the magnetic force acting between the rotor 12 and the rotor 12, the urging force is applied to the rotor 12 to rotate in the counterclockwise direction
Thereafter, this state is maintained. In this case, as described above, the power supply does not need to be stopped unless power saving is considered.

After the state shown in FIG. 4 is reached, photographing is started as described above. When the counting of the seconds corresponding to the exposure time is completed, the coil 13 is energized in the positive direction by the output signal from the exposure time control circuit. Therefore, the rotor 11 is rotated clockwise from the state shown in FIG. 1, and causes the shutter blades 4 and 5 to perform the closing operation by the output pin 21a. FIG. 5 shows a state in which after the shutter blades 4 and 5 close the opening 1a, the output pin 21a comes into contact with the upper end surface of the elongated hole 1g and stops. In addition, when this closed state is established, energization of the coil 13 is cut off.

In this closed state, when the subject image is stored in the storage medium, the energization of the coil 14 in the forward direction is performed, so that the rotor 12 is rotated clockwise and the output pin 22a is turned on. Then, the diaphragm blade 6 is rotated counterclockwise. FIG. 6 shows a state in which the output pin 22a is in contact with the upper end surface of the elongated hole 1h. In the state of FIG. 6, the energization of the coil 14 is stopped, but the rotor 12 keeps this state for the reason already described. Thereafter, since the current is supplied to the coil 13 in the reverse direction, the rotor 11 is rotated in the counterclockwise direction, and the output pin 21a is
To make it open. Then, the output pin 21a abuts on the lower end surface of the elongated hole 1g and stops,
It returns to the state shown in FIG. 1 and FIG.

After that, the power supply to the coil 13 is cut off,
In preparation for the next shooting, if you do not want to take the next shooting, just open the power switch in this state,
There is no need for the actuator to function at all. Note that, in the description of the operation when the subject is relatively bright, FIG.
In order to return from the state shown in FIG. 3 to the state shown in FIG. 3, first, the case where the aperture blade 6 is returned and then the shutter blades 4 and 5 are returned has been described. However, the order is not particularly significant. No problem. If the power consumption can be performed at once, the power can be restored at the same time.

[Second Embodiment] Next, a second embodiment will be described with reference to FIGS. FIG. 7 is a plan view as viewed from the subject side, and FIG. 8 is a cross-sectional view of main parts in FIG. This embodiment is also a digital camera shutter using a twin actuator, but differs from the first embodiment in that one rotor drives the shutter blades and the other rotor drives the lens. It is. Although the entire configuration of the actuator employed in this embodiment is not specifically shown, it is actually identical to the actuator employed in the first embodiment. Therefore, for the actuator, the same reference numerals as in the first embodiment denote the same members and portions only, and a description of the configuration will be omitted. Although the shape and mounting configuration of the shutter blades are not shown, they are omitted since they are exactly the same as in the first embodiment.

The shutter base plate 31 of this embodiment is made of synthetic resin, and has a circular opening 31a substantially at the center. An auxiliary base plate 32 is attached to the shutter base plate 31 by appropriate means, and a shutter chamber is formed therebetween. Also, as mentioned above,
The shutter blades in the present embodiment have exactly the same two constructions as the shutter blades 4 and 5 of the first embodiment, and are rotatable on two shafts erected on the shutter base plate 31 in the shutter chamber. Installed. The shutter base plate 31 has the same long hole as the long hole 1g of the first embodiment, and the output pin 21a integrated with the rotor 11 is formed.
Are fitted in long holes formed in the shutter blades. The auxiliary base plate 32 also has an opening 3 similar to the opening 31a.
2a is formed, but in this embodiment, the opening 3a is formed.
1a regulates the exposure aperture.

The shutter base plate 31 has a cylindrical portion 3 on the subject side.
1b is formed, and a female helicoid screw is formed on the inner peripheral surface thereof. The lens barrel 33 is made of a synthetic resin, and has a lens 34 mounted therein. A male helicoid screw that is screwed to the helicoid screw of the cylindrical part 31b is formed on the outer peripheral surface. The lens barrel 33 has a protruding portion in the radial direction, and a pin 33a is provided therein.

A shaft 31c is provided on the shutter base plate 31, and a lever 35 is rotatably mounted thereon. Also, the screw 36 is attached to the screw hole of the shaft 31c to prevent the lever 35 from coming off.
The lever 35 has two notches 35a,
The pin 33a is fitted into the notch 35a, and the output pin 22a integral with the rotor 12 is fitted into the notch 35b. The tip of the output pin 22a is inserted into a long hole 31d formed in the shutter base plate 31, so that the output pin 22a can be operated without any trouble.

Next, the operation of this embodiment will be described. The state shown in FIG. 7 shows a still state before shooting.
Moreover, since the camera is not in use, the power switch is turned off and the coils 13 and 14 are not energized. At this time, the magnetic force acting between the S pole (the lower magnetic pole in FIG. 7) of the rotor 11 and the magnetic member 17 is N
Since the magnetic force is larger than the magnetic force acting between the pole and the magnetic member 18, the rotor 11 is provided with a biasing force that rotates in the counterclockwise direction, and the shutter blade maintains the fully opened state of the opening 31a. . On the other hand, the rotor 12 also has its S pole (the lower magnetic pole in FIG. 7) and the magnetic member 19.
Is larger than the magnetic force acting between the N pole and the magnetic member 20, so that an urging force rotating in the counterclockwise direction is also applied. Therefore, the output pin 22a rotates the lever 35 clockwise, and keeps the lens barrel 33 extended to the subject side.

When the power switch of the camera is closed prior to photographing, the image pickup device is energized and the subject can be observed on the image monitor. Thereafter, when taking a picture, when a release button is pressed, it is determined whether to take a picture with the lens barrel 33 extended or to take a picture with the lens barrel 33 extended, based on a measurement result of a distance measuring device (not shown), In addition, the exposure time is determined.

Therefore, when photographing is performed with the lens barrel 33 extended, photographing is immediately performed using a signal to start accumulation of electric charges in the image sensor as a trigger signal. When the counting of the second time corresponding to the exposure time is completed, the output signal of the exposure time control circuit causes the coil 13 to return.
Is supplied with electricity in the positive direction. Therefore, the rotor 1
1 is rotated clockwise from the state of FIG.
1a causes the shutter blades to perform the closing operation,
In the closing operation, after the shutter blade closes the opening 31a, the output pin 21a comes into contact with the stopper (the upper end surface of the long hole corresponding to the long hole 1g shown in the first embodiment) and stops.

In this closed state, the power supply to the coil 13 is cut off. At this time, the magnetic force acting between the N pole (the upper magnetic pole in FIG. 7) of the rotor 11 and the magnetic member 18 becomes the S pole. Since the magnetic force acting on the rotor 11 is larger than the magnetic force acting between the rotor 11 and the magnetic member 17, a biasing force that rotates clockwise is applied to the rotor 11, and this state is maintained. In the closed state, the subject image is stored in the storage medium. When the image ends, the coil 13 is energized in the reverse direction. Therefore, the rotor 11 is rotated in the counterclockwise direction to cause the shutter blades to open by the output pin 21a, and after returning to the state of FIG. 7, the energization of the coil 13 is stopped to prepare for the next photographing.

On the other hand, when photographing is performed with the lens barrel 33 retracted, the coil 14 is first energized in the positive direction. Therefore, the rotor 12
Is rotated clockwise from the state of FIG.
By a, the lever 35 is rotated counterclockwise. Further, thereby, the lens barrel 33 is retracted leftward in FIG. Then, the output pin 22a is
The stopper comes into contact with the stopper (the upper end face of the long hole corresponding to the long hole 1h shown in the first embodiment) and stops. Then, the coil 14
Of the rotor 12 at this time,
Since the magnetic force acting between the pole (the upper magnetic pole in FIG. 7) and the magnetic member 20 is larger than the magnetic force acting between the S pole and the magnetic member 19, the rotor 12 has a clock. A biasing force rotating in the direction is applied, and this state is maintained.

In this way, after the lens barrel 33 is retracted, the photographing is performed. After the photographing is started, the shutter blades close and the subject image is stored in the storage medium. The description up to the end of the opening operation of the shutter blade is the same as the above-described case in which the photographing is performed with the lens barrel 33 extended, so that the description is omitted to avoid duplication. Then, when the shutter blades open and end the operation,
This time, the coil 14 is energized in the reverse direction.
Therefore, the rotor 12 is rotated counterclockwise, and the output pin 22a rotates the lever 35 clockwise.
As a result, the rotor 12 returns to the state shown in FIG. 7, and the lens barrel 33 returns to the extended position shown in FIG.
Thereafter, the power supply to the coil 14 is cut off and the power switch is opened when the photographing is not performed in preparation for the next photographing. The returning operation of the lens barrel 33 may be performed before the opening operation of the shutter blades, or may be performed at the same time.

In each of the above embodiments, the drive arm is made of a synthetic resin and is integrated with the rotor by molding. However, the present invention is not limited to such a structure. Instead, the rotor and the drive arm may be formed together using a mixed material of a resin material and a magnetic material. Further, in each of the above embodiments, two rotors are supported on the stator frame, but three or more rotors may be provided. Further, in each of the above embodiments, the stator frame is constituted by the base frame and the cover frame, and the bearing of the rotor is shared between them. However, in the present invention, the stator frame is constituted by one member. Even if
It may be composed of three or more members, and the rotor may be supported by the same member.

In each of the above embodiments, the rotor and the coil are arranged such that the winding axes of the coils are on a common axis and the winding directions of the coils are the same. The rotation axes are parallel to each other and the two poles of each rotor
Of Although the orientation of the polarity is arranged so obtained so that the same as the other rotor, the present invention is not limited to such a configuration. That is, provided that the winding axes of the coils are on the common axis and the winding directions of the coils are the same, the polarity of the two poles of the rotor is not necessarily different from that of the rotor. Can be the same as the rotor of
Each rotor does not need to be arranged in the same direction, and each rotor has its rotation axis parallel to each other and its two poles have the other polarity.
If the coils are arranged so as to be able to be the same as the rotor , it is not always necessary that the winding axes of the coils are on the common axis and the winding directions of the coils are the same. . Further, the conductors of each coil need not necessarily have the same wire diameter, and may be different for each coil.

[0042]

As described above, according to the present invention, since a plurality of individually controllable rotors are supported by the common stator frame, the number of parts is small and the space is small. This is advantageous for mounting on a motor, and the arrangement of coils and rotors can reduce the number of man-hours in the winding process and the magnetizing process. It is very advantageous for the formation.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment viewed from a subject side, showing a stationary state before photographing.

FIG. 2 is a sectional view of a main part of FIG.

FIG. 3 is a plan view when the actuator is removed from FIG. 1;

FIG. 4 is a plan view similar to FIG. 3,
This shows a state in which the aperture blade is inserted into the exposure opening from the initial position during photographing.

FIG. 5 is a plan view similar to FIG. 3,
This shows a state immediately after the end of shooting.

FIG. 6 is a plan view shown in the same manner as FIG. 3,
FIG. 6 shows a state in which the diaphragm blade has returned to the initial position from the state shown in FIG. 5.

FIG. 7 is a plan view of the second embodiment viewed from the subject side, showing a stationary state before photographing.

FIG. 8 is a sectional view of a main part of FIG. 7;

[Explanation of symbols]

1, 31 Shutter base plate 1a, 6a, 31a, 32a Opening 1b, 1c, 1d, 31c Shaft 1e, 1f Mounting 1g, 1h, 4a, 5a, 6b, 9a, 9b, 31d
Slot 2 Intermediate plate 3, 32 Auxiliary ground plate 4, 5 Shutter blade 6 Aperture blade 7, 8, 36 Screw 9 Base frame 10 Cover frame 10a Hook portion 10b, 10c, 31b Tube portion 11, 12 Rotor 13, 14 Coil 15 , 16 Yoke 17, 18, 19, 20 Magnetic member 21, 22 Drive arm 21a, 22a Output pin 33 Lens cylinder 33a Pin 34 Lens 35 Lever 35a, 35b Notch hole

Claims (6)

(57) [Claims] 1. A husband proximity position definitive common stator frame s
And a plurality of permanent magnets made of a rotor which is magnetized in two poles, which are provided integrally with the output pins extending parallel to the rotation axis of the rotary shaft and the parallel in the radial position of the respective rotary shafts are bearing A plurality of coils wound around the common stator frame so as to surround two bearing portions for each rotor, each coil having its winding axis on a common axis, and Wherein the winding directions are the same. Wherein each position near the definitive common stator frame s
And a plurality of permanent magnets made of a rotor which is magnetized in two poles, which are provided integrally with the output pins extending parallel to the rotation axis of the rotary shaft and the parallel in the radial position of the respective rotary shafts are bearing A plurality of coils wound around the common stator frame so as to surround two bearing portions for each of the rotors , and each rotor has a boundary between magnetic poles on a respective rotating surface.
The lines can be aligned in the same direction,
Actuator, wherein a polarity of the same side of the boundary lines are all disposed on so that a same polarity. Wherein each position near the definitive common stator frame s
And a plurality of permanent magnets made of a rotor which is magnetized in two poles, which are provided integrally with the output pins extending parallel to the rotation axis of the rotary shaft and the parallel in the radial position of the respective rotary shafts are bearing A plurality of coils wound around the common stator frame so as to surround two bearing portions for each rotor, each coil having its winding axis on a common axis, and Are wound in the same direction , and each rotor is separated from the boundary of the magnetic pole on the respective rotation plane.
Can be aligned in the same direction, and each boundary
Actuator, wherein a polarity of the same side of the line are all disposed on so that a same polarity. 4. The common stator frame includes a common base frame that supports one of the rotors and a common cover frame that supports the other of the rotors. The actuator according to any one of claims 1 to 3, wherein 5. The actuator according to claim 1, wherein two of said rotors are supported by said common stator frame, and said actuator is mounted on a shutter base plate, and said output pin of one of said rotors is mounted on said shutter base plate. A shutter for a camera, wherein a shutter blade is driven, and the output pin of the other rotor drives an aperture blade. 6. The actuator according to claim 1, wherein two of said rotors are supported by said common stator frame, and said actuator is mounted on a shutter base plate, and said output pin of one of said rotors is mounted on said shutter base plate. A shutter for a camera, wherein a shutter blade is driven, and the output pin of the other rotor drives a lens in an optical axis direction.