JPH10293334A - Position control device and compensating optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly control a travel member position without any need of laying an expensive position detection means by keeping the rotor position of a stepping motor electrically at the same phase at the first and the second positions of a travel member. SOLUTION: A rotor 193 made of a plastic magnet has a periphery magnetized at a plurality of positions either divisionally or alternately, and a gear is integrated with the rotor 193 for the transmission of the torque thereof to the rack of a lock ring. In addition, coils 194 and 195 respectively excite stator yokes 191 and 192. In this case, a position for enabling the rotor 193 to stop under the interruption of electric power is called a stable position or a single- phase power supply position. Furthermore, the positions of the rotor 193 at a lock ring engagement position and a lock ring disengaged position are both taken as an A-shape power supply position as mechanically stable positions. According to this construction, the stop position of the rotor 193 becomes stable, even when the power supply is interrupted after a drive, and can remain stopping at the position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a position control device for controlling the position of a moving member using a stepping motor as a drive source, and a correction optical device for switching the state of locking means using a stepping motor as a drive source. is there.

[0002]

2. Description of the Related Art In a current camera, since all important operations for photographing such as exposure determination and focusing are automated, there is a very small possibility that even a person who is not experienced in operating the camera will fail in photographing. .

Recently, a system for correcting an image blur caused by a camera shake applied to a camera has been studied, and a factor which causes a photographer to fail in photographing has almost disappeared.

Here, a system for correcting image blur caused by camera shake will be briefly described.

[0005] The camera shake at the time of photographing is usually a vibration of 1 Hz to 12 Hz as a frequency. However, even if such camera shake occurs at the time of release of the shutter, it is possible to take a picture without image shake. As a basic idea, it is necessary to detect the camera shake caused by the camera shake and to displace the correction lens according to the detected value. Therefore, in order to be able to take a picture in which image shake does not occur even if camera shake occurs, first, it is necessary to accurately detect the camera vibration, and second, to correct the optical axis change due to the camera vibration. Needs to be displaced and corrected.

In principle, this vibration (camera shake) is detected by a vibration detecting section for detecting acceleration, speed, and the like, and a displacement is obtained by electrically or mechanically integrating an output signal of the vibration detecting section. This can be performed by mounting a vibration detection device or the like including an arithmetic unit having an integrator or the like that outputs the data on a camera. Then, based on this detection information, the image blur correction can be performed by controlling the correction optical device in the image blur correction device mounted to change the photographing optical axis, that is, by displacing the correction lens.

Further, many conventional examples (Japanese Patent Laid-Open No. Sho 62-188)
No. 75, JP-A-7-98469, JP-A-7-9846
No. 9) includes a locking member in the correction optical device that can mechanically lock and lock the displacement of the correction lens, so that the image blur correction operation is not required (image blur correction). When the interchangeable lens equipped with the device is detached from the camera body or the image blur operation switch is turned off, etc.), the driving means controlled by the control means such as the CPU moves the locking member, and the correction lens Fixed and locked so that the optical axis of the lens coincides with the optical axis of the other lens, it is possible to prevent damage due to disturbance vibration (vibration applied when carrying) due to rattling of the correction lens and wasteful power consumption by the correction optical device. Is going. Further, various proposals using a stepping motor as a drive source for the front locking member drive section have been made by the present applicant. These are configured to be able to hold the locking member by utilizing the magnitude of the self-holding force at a stable position due to the detent torque of the stepping motor. It does not require electric power for maintaining the stationary state, and it is possible to maintain the state stably.

[0008]

However, even in the above-described conventional example using a stepping motor, when a large impact exceeding the detent torque is applied, the stepping motor locks the locking member or sets the locking member in the locked state. It was not possible to keep it in the unlocked state, and it moved to the next stable position against the detent torque. As a result, the control means sends a drive pulse signal to the stepping motor to switch between the two states in the subsequent control, even though the locking member is stopped at a position that is not in the locked state or the unlocked state. As a result, the actual movement of the stepping motor cannot follow this drive pulse signal, and loses synchronism, resulting in a switching failure of the locking member.

As described above, when the image blur correction operation is not normally required (such as a state in which an interchangeable lens equipped with an image blur correction device is detached from a camera body or a state in which an image blur operation switch is turned off). Generally, the locking member is held in a locked state. However, when a conventional example using the above-described stepping motor is applied to a system for driving an image blur correction device in an interchangeable lens by a power supply in a camera body, such as a vibration reduction system in a commercially available single-lens reflex camera, The power supply is cut off by accidentally removing the interchangeable lens from the camera body during the image blur correction operation or turning off the power (particularly removing the battery), and the locking member is locked. In some cases, the lens cannot be driven, and the correction lens remains in an unlocked state.

Therefore, when the interchangeable lens is mounted on the camera body or when a new battery is inserted, it cannot be determined whether the locking member is stopped in the locked state or the unlocked state. In addition, since the stop position shift due to the impact can occur at the same time, the control means cannot send an appropriate drive pulse signal according to the stop position of the stepping motor.

Although it is effective to provide a means for detecting the state of the locking member in order to solve the above problems, it is only necessary to detect only the locked state or the non-locked state of the locking member. Since it is not possible to detect the position when the stop position shift occurs due to the above impact alone, a mechanism for detecting the position of the locking member over a wide range is required, and there are significant disadvantages in terms of space and cost, and a small and inexpensive vibration isolation system. There was a drawback that it was difficult to provide.

(Object of the Invention) A first object of the present invention is to provide a method for detecting the position of an expensive moving member without providing a means for detecting the position of the moving member.
It is an object of the present invention to provide a position control device capable of appropriately controlling the position of a moving member even when the stop position of the moving member is shifted due to an impact or the like.

A second object of the present invention is to eliminate the need for providing a means for detecting the state of an expensive locking means, and to prevent the locking means from being displaced due to an impact or the like to prevent the locking means from being in a locked state or an unlocked state. In both cases, it is an object to provide a correction optical device capable of appropriately controlling the position of the locking means.

[0014]

In order to achieve the first object, the present invention according to claims 1 and 2 is characterized in that when a predetermined function section is brought into a first function state, it is placed in a first position. A moving member located at a second position when the predetermined function unit is brought into the second function state, and moving the moving member from the first position to a second position.
Or a stepping motor for driving from the second position to the first position, and the rotor position of the stepping motor at the first position and the second position of the moving member is electrically controlled. A position setting device having a function of changing the position from one to the other in a predetermined number of steps by energizing the stepping motor in the phase. The movable member can be positioned at the first position or the second position where the movement should be stopped.

Further, in order to achieve the second object,
According to a third aspect of the present invention, there is provided a correction optical system movable to correct an image shake caused by a shake applied to an optical apparatus, and a locking state for locking the correction optical system so as not to move. Locking means for setting a movable unlocked state;
A stepping motor for driving the locking means from the locked state to the unlocked state or from the unlocked state to the locked state; A correction optical device in which the rotor positions of the stepping motor in the state are electrically in phase with each other, and by energizing the stepping motor in the phase, the state is changed from one to the other with a predetermined number of steps. The structure is such that the movement of the locking means can be controlled by the stepping motor having a function of changing the locking means, and the locking means can be moved to a locked state or a non-locked state to be taken when the vehicle is originally stopped.

Similarly, in order to achieve the second object,
According to a fifth aspect of the present invention, there is provided a position detecting means for detecting a movement position of a correction optical system, and a stepping means which is electrically in-phase in the first state or the second state. After energizing the motor for a predetermined time, the position detecting means detects the position of the correction optical system, and determines whether the locking means is in a locked state or a non-locked state based on the result. The state discriminating means or the driving means for driving the correction optical system after the stepping motor is electrically energized in the first state or the second state for a predetermined time at the phase, and And a locking state determining means for determining whether the locking means is in a locked state or a non-locked state based on the result of the movement of the correction optical system by the output of the position detecting means. Have Is intended to positive optical device, further, and when the correction optical device is connected to the optical device main body,
When the power of the correction optical device is turned on (particularly when a new battery is inserted), the stepping motor is energized in the above-mentioned phase, so that the locking means is either locked or unlocked. State is determined by the locking state determination means, and when the device is in a state where the correction optical system can function, such as when power is supplied,
The correction optical system is driven to its original position so as to be in a locked state or a non-locked state, and it is configured to check which state the locking means is currently in.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is a block diagram schematically showing a system for correcting an image blur caused by a camera shake (an image blur correction device including a correction optical device and a vibration detecting device) according to an embodiment of the present invention. 81p camera shake in the direction of arrow 81 inside
And a system for correcting an image shake caused by a horizontal shake 81y.

In FIG. 1, reference numeral 82 denotes a lens barrel;
p and 83y are vibration detection units for detecting camera vertical vibration and camera horizontal vibration, respectively.
4p, 84y. 85 is a correction optical device (87
p and 87y are coils for applying thrust to the correction lens, and 8
Reference numerals 6p and 86y denote position detecting elements for detecting the position of the correction lens.
The image plane 88 is driven with the output of 3p, 83y as the target value.
To ensure stability at

FIGS. 2 to 15 are views showing the mechanical structure of the correction optical device in the image blur correction device according to one embodiment of the present invention. FIG. 2 is an exploded view of the main components of the correction optical device. FIG. 3 shows the correction optical device viewed from the left side in FIG. 2 (for the sake of explanation, the hard substrate 111 is removed so that the inside can be seen), and FIG. 3 as viewed from the direction of arrow A, and FIG.
FIG. 5 is a diagram showing a configuration of a portion relating to position detection of FIG.
5 (a) is a plan view and a sectional view showing a part of FIG. 5 (b) in an enlarged scale, FIG. 6 is a view showing a plane, a side view and a sectional view of the coil unit. 7 is a diagram for explaining the configuration of a drive unit for shake correction according to the present embodiment in comparison with a conventional configuration, FIG. 8 is a diagram showing the hard substrate 111 shown in FIG. 2 and the like, and FIG. Support frame 12 shown in FIG.
FIG. 3 is a diagram showing the base plate 13 and the bottom plate 13 viewed from the back side of the surface shown in FIG.
FIG. 10 is a diagram showing the lock ring 113 and the rolling restriction ring 112 shown in FIG.
FIG. 12 is a view for explaining when the support frame 12 is locked or unlocked by the lock ring 113. FIG.
13 is an exploded perspective view showing the components of FIG. 13. FIG. 13 is a view showing a positional relationship between the magnet rotor 193 and the stator yokes 191 and 192 in the stepping motor 19, and FIG.
FIG. 15 is a timing chart of coil energization in the stepping motor 19, and FIG. 15 is a diagram showing a relationship between a stop position of the stepping motor 19 and a state of the lock ring 113.

First, the configuration of a correction optical device in an image blur correction device according to an embodiment of the present invention will be briefly described with reference to FIG.

The correction lens 11 is supported by a support frame 12,
The support frame 12 is connected to the main plate 13. Then, a correction optical system including the correction lens 11 and the support frame 12 is driven in a pitch direction 114p and a yaw direction 114y by a driving unit including a permanent magnet and a coil, which will be described later, and the image blur is corrected. Reference numeral 113 denotes a lock ring, which locks the support frame 12, that is, the correction optical system at a predetermined position by transmitting an output of a stepping motor 19 described later to the rack 113a. 112 is a rolling regulating member, by fitting the support frame 12 via the three shaft portions 112a ₁ ~112a ₃ the base plate 13, decided to regulate the rolling of the optical axis of the support frame 12 Become. Reference numeral 111 denotes a hard board (printed board) on which various terminals such as a stepping motor and a coil, and various terminals such as a hall element described below, which constitute a position detecting means, are intensively wired on the same plane.

Hereinafter, the detailed configuration will be described with reference to FIGS.

Reference numeral 12 denotes a support frame for supporting the correction lens 11 (see FIGS. 3 and 9). The support frame 12 includes permanent magnets 14p and 14y shown in FIG.
15y, which is hidden by 15y)
15y is fixed by caulking or screwing.

Reference numeral 13 denotes a ground plate, and coils 16p and 16y are attached to the surface of the ground plate 13 facing the permanent magnets 14p and 14y (see FIG. 5B). This coil 1
6p (similarly for 16y), as shown in FIG. 6, is formed integrally with the coil frame 16a made of a resin material, and the coil 16p is connected to a terminal pin 16b which is a conductive member pressed into the coil frame 16a.
The two terminals p are connected to form a unit, and the terminal pin 16b is penetrated and soldered to a hard substrate 111 described later. 6 (a) is a plan view of the coil unit 16, FIG. 6 (b) is a side view, and FIG. 6 (c) is C in FIG. 5 (b).
It is a -C 'sectional view.

The yokes 15p and 15y and the permanent magnets 14 which constitute the driving means of the correction optical system are constructed as described above.
The relationship between p, 14y and coils 16p, 16y will be described with reference to FIG. FIG. 7A shows an embodiment of the present invention, and FIG. 7B shows an inappropriate example.
(C) shows a conventional example.

In the conventional example shown in FIG.
6p and 76y were attached to the support frame 75. The permanent magnet 73 forms a closed magnetic path indicated by a broken line 73b by the first yoke 712 and the second yoke 72 as shown. The reason why the closed magnetic path is formed in this way is that the flow of the magnetic flux is thereby adjusted and the driving efficiency is improved.

In the embodiment of the present invention, the support frame 12
When a permanent magnet 14p (14y) is mounted on the support frame 12, as shown in FIG.
What is necessary is just to provide the permanent magnets 14p and 14y and the opposing yokes 15ap and 15ay at positions facing the permanent magnets. Thus, a closed magnetic path 14a is formed.

However, in the embodiment of the present invention, the balance between the improvement of the driving efficiency by providing the opposed yokes 15ap and 15ay and the deterioration of the followability caused by the increase in weight due to the attachment of the opposed yokes 15ap and 15ay. From the viewpoint, as shown in FIG. 7A, a closed magnetic circuit is used without providing an opposing yoke. That is, the configuration focuses on the fact that the absolute value of power consumption can be reduced by not increasing the weight, rather than improving the driving efficiency.

As shown in FIGS. 3 and 9, arms 12a extend radially in three directions on the support frame 12, and rollers 17 are screwed to the arms 12a (see FIG. 5 for details).
(Via a screw 17a as shown in FIG.
Is inserted into the guide groove 13a of the base plate 13 (see FIGS. 2 and 4A) as described below. The guide groove 13a is shown in FIG.
As shown in FIG. 3A, the rollers 17 are elongated in the direction of the arrow 13b, so that the three rollers 17 can move in this direction. That is, the support frame 12 can freely slide in all directions in the plane including the base plate 13 (the optical axis direction 13c in FIG. 4A).
Only the position is regulated).

At the time of assembly, the arm 12a of the support frame 12 is
The roller 17 is screwed to one or two of the three places, and the screw 17 is screwed into the guide groove 13 of the base plate 13.
a, and the supporting frame 12 is placed on the main plate 13. Finally, the remaining rollers 17 are screwed to the arm portions 12 a of the supporting frame 12 through the remaining guide grooves 13 a, so that the supporting frame 12 is supported on the main plate 13. 12 is completed.

Here, it is possible to adjust the inclination of the correction lens 11 by making the above-mentioned roller 17 an eccentric roller as shown in FIG. 5 (a) (FIG. 5 (a) is as described above). FIG.
It is a figure which shows the plane and cross section which expanded a part of (b).). That is, by rotating the roller 17, the arm 12a
Is moved back and forth in the optical axis direction, so that the position of the three arm portions 12a in the optical axis direction can be adjusted by the rollers 17 so that the inclination of the correction lens 11 can be adjusted. The arm 12a cannot be rotated.

A lock ring 113 shown in FIGS. 10 (a-1) and 10 (a-2) is rotatably supported on the base plate 13 from the back side of the surface shown in FIG. A gear 193a provided on a rotor 193 of a stepping motor 19 (see FIGS. 3, 12, and 13; details will be described later) attached to the base plate 13 via (see FIG. 3) meshes with the rack 113a. The lock ring 113 can be driven in the rotation direction.
Four cams 11 provided on the lock ring 113
3b is a relationship with the four-point protrusion 12b shown in FIG.
The locking and non-locking of the support frame 12 functions as locking means.

That is, when the lock ring 113 shown in FIG. 10A is rotated counterclockwise, the lock ring 113 shown in FIG.
Since the cam portion 113b of the lock ring 113 is separated from the protrusion 12b of the support frame 12, the support frame 12 is free (unlocked) with respect to the lock ring 113 as shown in FIG.
When the lock ring 113 is rotated clockwise,
As shown in FIG. 11B, the flat portion 11 of the cam portion 113b
3c comes into contact with the projection 12b, and the support frame 12 and the lock ring 113 are engaged. That is, the support frame 12 is locked to the main plate 13.

Therefore, when performing the shake correction, the lock ring 113 is driven counterclockwise by the stepping motor 19 to bring the support frame 12 into a free state (unlocked state) with respect to the lock ring 113. When the correction is completed, the lock ring 113 is driven to rotate clockwise to bring the support frame 12 into a state in which the support frame 12 is locked with respect to the main plate 13 (an engagement state).

As described above, the support frame 12 is connected to the base plate 13 by the rollers 17 and the guide grooves 13a, and the position thereof is regulated in the optical axis direction. This support method is excellent in assemblability, and
The guide groove 13a is formed integrally with the
It is easy to manage the fitting between the hole 7 and the hole of the guide groove 13a (in general, it is easy to understand in consideration of the relationship between the roller and the cam, which are often used in the lens barrel). Further, by making the roller 17 a known eccentric roller, there is an advantage that the inclination between the support frame 12 and the base plate 13 can be adjusted by the rotation of the roller 17.

However, in the case of the above supporting method, the supporting frame 12 is moved in the pitch direction 114p and the yaw direction 1 shown in FIG.
In addition to being able to freely move in the direction 14y (shake correction direction), it also rotates in the rolling direction 114r. This rotation deteriorates the shake correction accuracy.

Therefore, in the present embodiment, the following method is adopted in order to reduce the influence of the rolling.

FIG. 9 (b) is a view of only the base plate 13 of FIG. 3 viewed from the back, and shows the elongated holes 13d ₁ , 1 extending in the 114y direction.
3d ₂ and 13d ₃ are provided. This long hole 13d
To _1, 13d _2, 13d _3, FIG. 10 (b-1), ( b-
Shafts 112a ₁ , 112a ₂ , 112a ₃ extending from the rolling regulating ring 112 shown in 2) in the direction opposite to the paper surface respectively penetrate. The shaft portion 112a ₁ and elongated hole 13d _1, located in each fitting relationship the shaft 112a ₃ and elongated hole 13d _3, the rolling regulating ring 112 from the two points is only movable in the direction 114y to the base plate 13.

[0040] The elongated hole 13d ₂ is elongated holes 13d _1, 13d
₃ is larger than the (but are drawn in substantially the same manner as in the drawing), and increase the fitting backlash between the shaft 112a _2. This is because the three shaft portions 112a ₁ , 112a ₂ , 11
2a ₃ and to become a duplicate fit to the fitting also is because the movement between the rolling regulating ring 112 and base plate 13 is astringent. That is, it is preferable to open one of the three long holes widely.

Now, considering the long hole 13d ₁ as a reference, 11
4y direction of span is longer than the elongated hole 13d ₂ of the elongated hole 13d _3. Therefore, when the fitting hole of the elongated holes 13d ₁ and slots 13d _3, the rolling regulating ring even when fitting play of the shaft portion 112a _1, 112a ₃ occurs 112 and the ground plane 13
Rolling play between them can be reduced. (Slot 13d
If the ₁ and slots 13d ₂ and the fitting hole, because the span of both direction 114y is short, rolling play becomes larger) rolling regulating ring 112 claws 13k provided at the main plate 13 (FIGS. 5 (b) and 9 (b)), the engagement is elastically restricted in the optical axis direction. The shaft portions 112a ₁ , 112a ₂ , 112a ₃ of the rolling restricting ring penetrate through the main plate 13 and enter the elongated holes 12c ₁ , 12c ₂ , 12c ₃ provided on the back surface of the support frame 12 and extending in the 114p direction (FIG. 9).
(See (a) back view of support frame and FIG. 5 (b)). Also in this case, the elongated hole 12c ₁ , the shaft portions 112a ₁ , 12c ₂ and the shaft portion 112
and the a ₂ in a fitting relationship, by setting a large elongated hole 12c _3, and avoid duplication fitting. Reason for wide open elongated hole 12c ₃ when this is the same as in the case of the long hole 13d. Therefore, the support frame 12 can move only in the 114p direction with respect to the rolling restriction ring 112.

With the above configuration, the support frame 12 can move only in the directions 114p and 114y with respect to the base plate 13 and is restricted in the rolling direction 114r. Since slight rolling due to the looseness between the holes 13d and 12b still remains, a spring 18 is provided between the hook 12d provided on the arm 12a on the support frame 12 and the hook 13e provided around the base plate 13. (See FIGS. 3 and 5). The spring 18 is shown in FIG.
As shown in FIG. 5, the support frame 12 extends radially from the center of the support frame 12 in three directions, and pulls the support frame 12 in an eight-split state. Since the hooks 12d are provided at positions far apart in the radial direction from the center of the support frame 12, when a force in the rolling direction acts on the support frame 12, the force is suppressed by the elastic force of the springs arranged in the eight-split direction. I can do things. That is, since the rolling is elastically regulated, it is possible to prevent the occurrence of minute rolling play.

FIG. 8 shows the hard substrate 111 shown in FIGS. 2, 4B and 5B, and the pattern 111c shown in FIG.
Hall elements 110p and 110y (only the positional relationship is shown in FIG. 3), which are position detecting means to be described later, are connected to the back side of p and 111cy by reflow.
Although an example using a Hall element as the position detecting means is shown, any magnetic detecting means such as an MR element may be used.
Further, an optical detecting means such as a photo reflector may be used.

The hard substrate 111 is mounted on the base plate 13 using the positioning pins 13f of the base plate 13 and the holes 111d of the hard substrate 111 as guides, and screws are passed through the holes 111e and screwed into the screw holes 13g (see FIG. 3). . At this time, as described above, the terminal pin 1 of the coil unitized
6b extends upward in the plane of FIG. 3, and coils 194 and 195 (FIG. 12) of the stepping motor 19 described later.
Connection terminals 194a, 194b, 195a, 19
5b also extends in this direction.
b and connection terminals 194a, 194b, 195a, 195b
Also penetrate through the holes 111b and 111a (see FIG. 8).
The holes 111a and 111b are through holes, and are electrically connected to the terminal pins 16p and 19a by soldering.

As position detecting means attached to the hard substrate 111, as described above, the Hall elements 110p, 11
0y is used (see FIG. 4B and FIG. 7A).

Hereinafter, the operation will be described with reference to FIG.

The Hall element 110p (110y) changes its output in response to a change in the surrounding magnetic field. In FIG. 7A, the Hall element 110p (110y) faces the bipolar magnetized permanent magnet 14p (14y), and the support frame 1
2 (for example, in the pitch direction 114p), the Hall element 110p (110y) and the permanent magnet 14p (14p).
y) is shifted, so that the Hall element 110p (1
10y), the magnetic field intensity applied to the Hall element 11 changes.
0p (110y) detects the position of the support frame 12 by performing output corresponding thereto.

FIG. 12 is an exploded perspective view showing components of the stepping motor 19 described above.

Reference numeral 191 denotes a stator yoke in which a plurality (six) of soft magnetic plates are laminated and fixed, and the soft magnetic plates are unitized by laminating plates of the same shape. I have.

Reference numeral 192 is the same component as the stator yoke 191 and serves as the other stator yoke of the two-phase type stepping motor. The stator yoke 192 is used by turning the stator yoke 191 upside down.

Reference numeral 193 denotes a plastic magnet rotor which is rotatable according to the excitation state of the stator yoke 191 and the stator yoke 192. The outer periphery of the rotor is dividedly and alternately magnetized to lock the rotational force of the rotor 193. A gear 193a for transmitting the ring 113 to the rack 113a is integrally provided. 194,19
5 is a stator yoke 191 and a stator yoke 1 respectively.
The coil 194 and the coil 195 are composed of the same components. Coils 194 and 195 are connected to connection terminals 194a, 194b, 195.
a, 195b to excite the stator yokes 191 and 192, respectively.

Reference numeral 196 denotes a positioning and supporting member for the stator yoke 191 and the stator yoke 192, and the rotor 1
A motor case that supports the rotation shaft 193b of the rotation shaft 93 as a rotation shaft, and is attached to the base plate 13 via the motor base plate 198 described above. Of course, the motor case 196 may be configured to be provided integrally with the main plate 13.

Reference numeral 197 denotes a motor case cover, which rotatably supports the rotation shaft 193c of the rotor 193, and which engages the claw portions 197a to 197d with the groove portions 196 of the motor case 196.
c to 196f, thereby forming a unitized stepping motor 1 as an electromagnetic drive device.
9 are configured.

Next, the operation of the stepping motor 19 having the above configuration will be described.

Connection terminals 194 to coils 194 and 195
When a current is passed through a, 194b, 195a, and 195b, a magnetic field is generated in the stator yokes 191 and 192 and acts with the magnetic field of the rotor 193 to form a closed magnetic path. At this time, if the coil 195 is not energized, the magnetic path generated by the energized coil 194 becomes dominant, and the rotor 193 generates a rotational torque (coil 1).
The same applies when only 95 is energized.) In addition, both coils 194, 1
Similarly, when current is supplied to the stator yoke 95, the stator yoke 192,
A magnetic path is formed in each of the rotors 193 and acts with the rotor 193 to apply a rotational torque to the rotor 193. Therefore,
By energizing the two coils 194 and 195 sequentially while switching the current direction, a conventionally known stepping motor can be driven, and the gear portion 193a of the rotor 193 and the rack 113a of the lock ring 113 mesh with each other. The lock ring 113 can be rotated by a predetermined angle.

FIGS. 13A to 13H show the rotor 193 and the stator yoke 191 of the stepping motor 19.
192 is a diagram showing a positional relationship with respect to 192. FIG.

In each figure, the poles magnetized on the outer periphery of the rotor 193 and the poles generated in the stator yokes 191 and 192 by energizing the coils 194 and 195 are as follows.
The notation of N and S is given.

FIG. 13A shows a state in which the coil 194 is energized in the direction in which the poles indicated on the stator yoke 191 are generated (hereinafter, this state is referred to as an “A-phase energized state” and an energized state in the opposite direction). Is referred to as “/ A phase energized state”). In such a state, since the poles of the rotor 193 are attracting the poles generated in the stator yoke 191, the poles of the rotor 193 are stopped facing the stator yoke 191. And rotor 19
No. 3 poles do not face each other, and
/ 2 (= P / 2). That is, the arrangement of the stator yokes 191 and 192 is “nP + (P / 2):
(N is an integer) ". Further, even if the power supply is stopped in this state, the rotor 1
Since the poles of 93 are attracting to the stator yoke 191, the rotor 193 can be stopped as it is. That is, it is in a mechanically stable position.

In the following description, such a position where the rotor 193 can be stopped even when the power is turned off is referred to as a “stable position” or a “one-phase energized position”.

FIG. 13B shows a state in which the coil 194 is energized in the A-phase and the coil 195 is energized in the direction in which the pole indicated on the stator yoke 192 is generated (hereinafter, this state is referred to as “B-phase energized state”). , And the energized state in the reverse direction is referred to as “/ B-phase energized state”). When the A and B phases are energized from the state of FIG. 13A, the poles of the rotor 193 and the poles generated in each stator repel or attract each other, and the rotor 1
Numeral 93 rotates clockwise by P / 4 and keeps the balance to stop in the state of FIG. Further, when the power supply is stopped in this state, the poles of the rotor 193 try to attract either the stator yoke 191 or 192, so that the rotor 193 cannot be stopped at the same position. The state moves to the state shown in FIG. 13A or the state shown in FIG.

In the following description, such a position where the rotor 193 cannot be stopped when the power is turned off is referred to as an “unstable position” or a “two-phase energized position”.

FIG. 13C is a diagram showing a state in which the energization to the coil 194 is cut off from the state of FIG. 13B and the B-phase energization is performed to the coil 195. At this time, the stator yoke 192
, Attract the poles of the rotor 193, and the rotor 193 further rotates clockwise P / 4 with respect to the state of FIG. 13B. This state is a stable position as in (a).

FIG. 13 (d) shows currents in the / A and B phases, FIG. 13 (e) shows current in the / A phase, FIG. 13 (f) shows currents in the / A and / B phases, and FIG. B-phase conduction, FIG.
13B, the rotor 193 rotates clockwise by P / 4 with respect to the previous figure, but the principle is the same as in FIGS. 13A to 13C. Description is omitted.

FIG. 14 is a timing chart of coil energization based on the above-described operation principle. The horizontal axis in FIG. 14 shows the number of pulses (or time), the vertical axis shows the energized state, and the lower part shows the energized phase and FIG.
The correspondence with the state of (h) is shown.

From this figure, it can be seen that there are eight possible combinations of current-carrying phases.
When counting as pulses, the rotor 193 can be rotated to an arbitrary angle by applying a current for the phase from the first pulse again after the ninth pulse. It is naturally possible to rotate the rotor 193 counterclockwise by P / 4 by tracing the states of FIGS. 13A to 13H in reverse.

FIG. 15 is a block diagram of the first and second embodiments described with reference to FIGS.
Rotor 193 of stepping motor 19 by two-phase drive
12 is a diagram showing a relationship between the stop position of the lock ring 113 and the state of the lock ring 113 shown in FIG.

In the drawing, the position where the rotor 193 stops without energization (one-phase energization position) is indicated by a white circle, and the position where the two coils are energized simultaneously and stopped (two-phase energization position) is indicated by a black circle. Shows the energized phase at that position.
11A shows a position where the lock ring 113 is locked as shown in FIG. 11B, and FIG. 11B shows a position of the rotor 193 where the lock ring 113 is unlocked as shown in FIG. In this embodiment, since the A-phase energized state is a mechanically stable position, the stop position is stable even when the energization is cut off after the end of driving, and the stop position is maintained at the same position. it can.

FIG. 16 shows an image blur correction device including the correction optical device described with reference to FIGS. 2 to 15 according to the present invention.
FIG. 2 is a block diagram of an interchangeable lens autofocus (AF) single-lens reflex camera system.

In the figure, reference numeral 200 denotes a camera body, and 300 denotes an interchangeable lens body. Reference numeral 201 denotes a camera CPU configured by a microcomputer, which controls operations of various circuits in the camera body 200 as described later, and communicates with the lens CPU 301 via the camera contact 202 when the lens body 300 is mounted. It is. Reference numeral 203 denotes an externally operable power switch, which is a camera CPU 2
01 is a switch for starting power supply to each actuator, sensor, and the like in the system and enabling the system to operate. Reference numeral 204 denotes an externally operable two-stage stroke release switch, the signal of which is input to the camera CPU 201.

The camera CPU 201 has a release switch 2
If the first stroke switch is ON (SW1 signal is generated) in accordance with the signal input from the signal input unit 04, the exposure measurement by the photometric circuit 205, a focusing operation, and the like are performed, and a shooting preparation state is entered, and the second stroke switch is turned ON ( SW2 signal generation)
When it is detected that the camera body 20 has been operated, the operation of various devices in the lens body 300 is controlled as will be described later.
When the lens is mounted on the lens unit 302, an aperture operation command, which will be described later, is transmitted to the camera CPU 201 via the lens contact 302, and an exposure start command is transmitted to the exposure circuit 206 to perform an actual exposure operation. When the exposure end signal is received, a feed start command is transmitted to the feed circuit 207 to perform the film winding operation. 208 is a distance measuring circuit,
When the switch SW1 of the release switch 204 is turned ON, a subject existing in the ranging area is measured according to a ranging start command transmitted from the camera CPU 201, and a focusing lens required for focusing on the subject is moved. The amount is determined and transmitted to the camera CPU 201.

Reference numeral 303 denotes an externally operable image blur operation switch (hereinafter, referred to as an IS switch) for selecting whether or not to perform an image blur correction operation (hereinafter, also referred to as an IS operation) described later (ON). To select IS operation). Reference numeral 304 denotes a vibration detection device, and the lens CPU 30
In accordance with an instruction from 1, a vibration detecting unit 304 a for detecting acceleration or speed of vertical and horizontal vibrations of the camera, and a displacement obtained by electrically or mechanically integrating an output signal of the vibration detecting unit 304 a is output to the lens CPU 301. And an operation unit 304b.

Reference numeral 305 denotes a correction optical device described in detail with reference to FIGS. 2 to 15, and is roughly divided into the following five components controlled by the lens CPU 301, respectively. The first is a correction optical system 305a mainly composed of the correction lens 11 and the support frame 12, and the second is mainly the permanent magnets 14p and 14
y, coils 16p and 16y,
The third is a driving means 305b for moving the first and second permanent magnets 14p, 14y and the Hall elements 110p, 11
0y, the position detecting means 305c for detecting the position of the moved correction lens 11, and the fourth comprises the lock ring 113 and the projection 12b of the support frame 12, and if necessary, the correction lens 11 is moved to a predetermined position. Fifth is a driving means 305e which is formed of a stepping mower and can drive the lock ring 113.

The correcting optical device 305, IS switch 303, vibration detecting device 304, and lens CPU 301 for controlling these constitute an image blur correcting device.

Reference numeral 306 denotes a focusing device. The driving circuit 3 is controlled by the lens CPU 301 according to the amount of movement of the focusing lens transmitted from the camera CPU 201 as described above.
06a and a focusing lens 306b driven by the driving circuit 306a. Reference numeral 307 denotes an aperture device, which includes a drive circuit 307a controlled by the lens CPU 301 in accordance with an aperture operation command transmitted from the camera CPU 201 as described above, and an aperture member 307b driven by the drive circuit 307a to determine an opening area. Have been.

FIG. 17 is a flowchart showing a main operation in the camera system shown in FIG.

First, the power switch 2 of the camera body 200
03 is turned on, power supply to the lens body 300 starts (or when a new battery is inserted, or when the lens body 300 is attached to the camera body 200, for example).
When communication is started between the lens CP and the lens body 300 (YES in # 5001), the lens CP
U301 is a locking means 305 in the correction optical device 305.
A-phase energization is performed on the stepping motor 19 constituting d (# 5002).

Thus, even if the rotor 193 is in the adjacent mechanically stable position (A / B or A / B phase energization) due to a large impact against the detent torque, for example,
It can be drawn to the position where the A-phase is energized.

That is, in the present embodiment, the rotor position of the stepping motor 19 in the locked state and the non-locked state is electrically in phase. Are both A-phase energized, the lock ring 113 has been moved from the locked state or the unlocked state to the next mechanical stable position due to the large impact as described above (the stop position shift occurred. In this case, it is possible to easily drive to the locked state or the unlocked state, which should have been stopped, simply by conducting the A-phase current irrespective of the state before the displacement.

Thereafter, the lens CPU 301 further detects the position of the correction lens 11 from the outputs of the Hall elements 110p and 110y (# 5003), and establishes a state in which the subsequent drive control can be appropriately performed by the above-described A-phase energization. Then, it is determined whether the lock ring 113 has been locked or unlocked. Specifically, the difference between the center position of the photographing optical axis and the position of the correction lens 11 (or the driving unit 3)
11b, an amount that can be actually moved when a drive command for the correction lens 11 is issued is obtained, and the obtained value is locked (see FIG. 11).
It is determined whether or not the value is smaller than the assumed locking play between the flat portion 113c of the cam 113b of the lock ring 113 and the projection 12b of the support frame 12 (see # 5004). Then, the process proceeds to step # 5006. If it is larger, it is determined that the locked state is not established, the stepping motor 19 is energized, and the lock ring 113 is driven to the locked state, which is the initial state (# 5005).

As a result, the drive current can be supplied to the locked state only when the lock ring 113 is in the unlocked state.
Unnecessary energization can be prevented, and power saving and improvement in reliability can be achieved.

The series of operations (# 5002- # 5)
005), regardless of the state of the lock ring 113 (locked state or non-locked state), and even if the stop position is displaced due to an impact, the stepping motor 19 is finally locked out of step. The ring 113 can be driven to a locked state.

Further, the lock ring 1 from the unlocked state
If the driving of the lock 13 is performed after the correction lens 11 (correction optical system 305a) is aligned with the center of the optical axis by the driving unit 305b, the driving load can be reduced and the driving can be performed in a shorter time. It is possible.

Next, the camera CPU 201 determines whether or not the SW1 signal is generated in the release switch 204 (# 5006). If it is, the lens CPU 301 turns on the IS switch 303 (selects the IS operation). It is determined whether the IS operation has been performed (# 5007). If the IS operation has been selected, the process proceeds to step # 5008, and if not, the process proceeds to step # 5022. In step # 5008, the lens CPU 301 starts an internal timer, and then the camera CPU 201 executes photometry, AF (ranging operation), lens CP
U301 energizes the stepping motor 19 so as to start AF (focusing operation) and shake detection, and to release the locking means 305d to enable shake correction control by the driving means 305b (# 5009).

Next, the lens CPU 301 checks whether or not the time measured by the timer has reached a predetermined time t _1, and if not, stays in this step until it reaches (# 5).
010). This is a process for waiting for a time until the output of the vibration detecting device 304 is stabilized. Then, starting when the predetermined time t ₁ has elapsed, through the driving means 305b based on the output of the target value signal and the position detecting means 305c by the output of the vibration detecting device 304 drives the correcting optical system 305a, the shake correction control (# 5011).

Next, the camera CPU 201 checks whether or not the SW2 signal is generated in the release switch 204 (# 5012), and if not, determines whether or not the SW1 signal is generated again (# 5012). 5014) If the SW1 signal is not generated, the lens CPU 301
Is stopped (# 5015), and the locking means 305d, that is, the stepping motor 1 is locked so as to lock the correction optical system 305a at a predetermined position (optical axis center position).
9 is energized (# 5016).

If it is determined in step # 5012 that the SW2 signal has not been generated, but it is determined in step # 5014 that the SW1 signal has been generated, the process proceeds to step # 5012.
Return to If it is determined in step # 5012 that the SW2 signal of the release switch 204 has been generated, the lens CPU 301 controls the aperture device 307, and at the same time, the camera CPU 201 performs an exposure operation on the film via the exposure circuit 206 (# 5013). Next, the camera CPU 201 checks the state of the SW1 signal (# 501).
4) When the SW1 signal is no longer generated, the lens CPU 301 stops the shake correction control as described above (#
At the same time, the stepping motor 19, which is the driving means 305b, is energized so that the correction optical system 305a is locked at a predetermined position (the optical axis center position) by the locking means 305d (# 5016).

When the above operation is completed, the lens CP
U301 do once reset and started again (# 5017), Determining Whether again SW1 signal is generated within a predetermined time t ₂ the timer (# 5018 → # 50
19 → # 5018 ...). If shake again SW1 signal to a predetermined time t in ₂ stop the correction occurs, photometry, AF (distance measurement and focusing operation) and a correction optical system 30
5a is released (# 5020), and since the shake detection is continued, the correction optical system 305a is immediately driven based on the target value signal and the output of the position detection means 305c, and the shake correction control is started again. (# 5011).

Hereinafter, the same operation as described above is repeated. By performing such processing, as described above, when the photographer stops the release operation and then performs the release operation again, the inconvenience of activating the vibration detection device 304 and waiting for the output to stabilize each time is avoided. It can be eliminated.

On the other hand, a predetermined time t after the shake correction is stopped
_{If the} SW1 signal is not generated within ₂ (# 508)
YES), the shake detection is stopped (the operation of the vibration detection device 304 is stopped) (# 5021). Then step # 5
Returning to 006, the process enters a state of waiting for the generation of the SW1 signal.

If the IS operation has not been selected in step # 5007, the camera CPU 201
The lens CPU 301 executes AF (ranging operation) and AF (focusing operation), respectively (# 5022).

Next, the camera CPU 201 checks whether or not the SW2 signal of the release switch 204 has been generated (# 5023), and if not, determines again whether or not the SW1 signal has been generated (# 5023). 5025) If no SW1 signal has been generated, the flow returns to step # 5006 to enter a state of waiting for generation of the SW1 signal. If it is determined that the SW2 signal has not been generated in step # 5023 but the SW1 signal has been generated in step # 5025, the process returns to step # 5023. Then, in this step # 5023, the release switch 204 is set to SW.
When it is detected that two signals have been generated, the lens CPU 30
1 controls the aperture device 307 and at the same time
1 performs an exposure operation on the film via the exposure circuit 206 (# 5024). Next, the camera CPU 201
The state of one signal is checked (# 5025). If the SW1 signal has not been generated, steps # 5025 to # 50 are performed.
Return to 06.

In the AF single-lens reflex camera system of the interchangeable lens type according to the present embodiment, the power switch 203 is turned off.
The above-described series of operations is repeated until F is reached, and when turned off, communication between the camera CPU 201 and the lens CPU 301 ends, and power supply to the lens body 300 ends.

According to the above embodiment, the rotor position of the stepping motor 19 in the locked state and the unlocked state of the lock ring 113 is electrically in phase (A phase conduction in the embodiment). Even if the lock ring 113 shifts the stop position due to an impact or the like, the A-phase energization allows the lock ring 113 to be easily shifted.
Can be driven to a locked state or a non-locked state. Accordingly, the lock ring 11 can be brought to a state where it should be stopped without providing an expensive and large-sized position detecting means for detecting the position of the lock ring 113.
3 can be located.

The A-phase energization is performed when an interchangeable lens (having an image blur correction device) is mounted on the camera body or when power is supplied. The switching control of the ring 113 can be appropriately performed.

The relationship between each means shown in the claims and each of the above-described embodiments is as described above. However, the present invention is not limited to the configurations of these embodiments. It goes without saying that any configuration may be used as long as the function described in the section or the function of the embodiment can be achieved.

(Modification) In the above embodiment, the case where the stepping motor is used for switching between the locked state and the unlocked state of the lock ring is described as an example. However, the present invention is not limited to this. A stepping motor, and a moving member moved between the first position and the second position by the stepping motor, the moving member having the first position or the second position as an initial position, The present invention can be applied to any device having a structure that is controlled to move to the position.

In the above embodiment, the lock ring for locking the correction lens is used as the moving member. However, for example, a mirror interposed between the zoom lens and the stepping motor to set the position of the zoom lens. A cylinder (having a structure that is driven and controlled with the tele end or the wide end as an initial position) may be used as the moving member.

As is apparent from the above description, the present invention has been described with respect to an example in which the present invention is applied to a camera. However, the present invention is not limited to this. The present invention is also applicable to a device having a correction optical device and other devices. It is possible.

[0099]

As described above, according to the present invention,
Provided is a position control device capable of appropriately controlling the position of a moving member without providing a means for detecting the position of an expensive moving member, even when a stop position shift of the moving member occurs due to an impact or the like. You can do it.

Further, according to the present invention, there is provided no means for detecting the state of the expensive locking means, and even if the locking means is displaced by an impact or the like and is not in the locked state or the non-locked state. It is possible to provide a correction optical device capable of appropriately controlling the position of the locking means.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing a system for correcting image blur according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing main components of the correction optical device according to the embodiment of the present invention.

FIG. 3 is a diagram illustrating a correction optical device viewed from a left direction in FIG. 2;

4 is a diagram showing a configuration of a portion related to the detection of the position of the correction lens from the direction of arrow A in FIG.

FIG. 5 is a sectional view taken along line B-B 'of FIG.

FIG. 6 is a diagram showing a plane, a side surface, and a cross section of the coil unit according to the embodiment of the present invention.

FIG. 7 is a diagram for explaining a configuration of a drive unit for shake correction according to an embodiment of the present invention by comparison with a conventional configuration.

FIG. 8 is a plan view showing the hard substrate shown in FIG. 2 and the like.

9 is a diagram showing the support frame and the base plate shown in FIG. 2 and the like as viewed from the back side in FIG. 3;

10 is a diagram showing the lock ring and the rolling restricting ring shown in FIG. 2 and the like as viewed from the plane in FIG. 3;

FIG. 11 is a view for explaining a lock mechanism of the support frame by the lock ring shown in FIG. 2 and the like.

FIG. 12 is an exploded perspective view showing components of the stepping motor according to the embodiment of the present invention.

13 is a diagram showing a positional relationship between a magnet rotor and each stator yoke in the stepping motor of FIG.

14 is a timing chart of coil energization in the stepping motor of FIG.

FIG. 15 is a diagram showing a relationship between a stop position of the stepping motor of FIG. 12 and a state of a lock ring.

FIG. 16 is a block diagram showing a circuit configuration of an interchangeable lens equipped with an image blur correction device according to an embodiment of the present invention and a camera body.

17 is a flowchart showing a series of operations of the camera in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Correction lens 12 Support frame 12b Cam part 13 Base plate 13b Cam part 14p, 14y Permanent magnet 19 Stepping motor 113 Lock ring 191, 192 Stator yoke 193 Rotor 301 Lens CPU 305 Correction optical device 305a Correction optical system 305b Driving means 305c Position detection means 305d Locking means 305e Driving means

Claims (8)

[Claims] A moving member positioned at a first position when the predetermined function unit is set to the first function state, and at a second position when the predetermined function unit is set to the second function state; A stepping motor for driving the moving member from the first position to the second position or from the second position to the first position, wherein a first position and a second position of the moving member are provided. Wherein the rotor position of the stepping motor is electrically in phase with each other. 2. The moving member is connected to an optical member,
2. The position control device according to claim 1, wherein the position control device is used for controlling the position of the optical member. 3. A correction optical system movable to correct image blur caused by a shake applied to an optical apparatus, a locked state for locking the optical system so as not to be moved, and a movable non-locked state. And a stepping motor for driving the locking means from the locked state to the unlocked state or from the unlocked state to the locked state. A correction optical device, wherein the rotor positions of the stepping motor in the locked state and the unlocked state of the stopping means are electrically in phase with each other. 4. The correction optical device according to claim 3, wherein the rotor position is a mechanically stable position in a non-excited state. 5. A position detecting means for detecting a moving position of the correction optical system, and a step for supplying a predetermined time to the stepping motor in the locked state or the non-locked state. After the power is supplied, the position detection unit detects the position of the correction optical system, and based on the result, determines whether the locking unit is in a locked state or a non-locked state. 5. The correction optical device according to claim 3, further comprising: 6. A driving unit for driving the correction optical system, a position detection unit for detecting a movement position of the correction optical system, and electrically in-phase in the locked state or the non-locked state. After the stepping motor is energized for a predetermined time at the phase, the driving means is operated and the amount of movement of the correction optical system by this is obtained from the output of the position detecting means. 5. The correction optical device according to claim 3, further comprising: a locking state determination unit configured to determine which state is in a locking state or a non-locking state. 7. A connection state detecting means for detecting a connection state with the optical device main body, wherein the locked state determination means detects that the optical device main body is connected by the connection state detecting means. 7. The correction optical device according to claim 5, wherein the operation is started by being performed. 8. A power supply state detecting means for detecting a state of power supply, wherein the locking state determining means detects that power has been supplied to the apparatus by the power supply state detecting means. 7. The correction optical device according to claim 5, wherein the operation is started by the operation.