JPH11119280A - Position controller and correction optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly control the position of a moving member without providing a device with an expensive means detecting the position of the moving member by selectively energizing a stepping motor so that it is driven according to whether the moving member is set at a first position, a second position or another position when the moving member is moved. SOLUTION: When the power source switch 203 of a camera main body 200 is turned on and power is started to be supplied to a lens main body 300 from a power source, the stepping motor of a lock means 305d in a correction optical device 305 is energized so as to be driven at the interval of an energizing pulse T2(second driving pattern) by a lens CPU 301 and a lock ring is driven to a lock state. Next, when an SW-1 signal is generated at a release switch 204 and an IS action is selected, the stepping motor is energized so as to be driven at the interval of the energizing pulse T2(first driving pattern) by the CPU 301 so that the release of the lock means 305d is executed in order to realize a shake correction control action. Thus, the lock means 305d can be surely moved to the desired state.

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 an optical correction device for controlling the position of a 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, so that the correction lens can be damaged by disturbance vibration (vibration applied when carrying), and wasteful power consumption by the correction optical device. Prevention.

Further, a proposal using a stepping motor as a driving source for a driving portion of the locking member (Japanese Patent Application No. 9-209,197).
No. 114198, Japanese Patent Application No. 9-114199) are also variously 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.

[0009]

Normally, when there is no need to perform a shake correction operation (such as when an interchangeable lens equipped with an image shake correction device is detached from the camera body or when an image shake 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 or turning off the power (particularly removing the battery) during the image blur correction operation or the driving of the locking member. The stop member cannot be driven to the locked state, and the correction lens may remain in the non-locked state or may be in a state other than either the locked or non-locked state (halfway stopped state). Was.

Further, when a large impact exceeding the detent torque is applied to the stepping motor, the stepping motor may be in a state other than the locked state or the non-locked state (a halfway stopped state). .

Therefore, when the interchangeable lens is mounted on the camera body or when a new battery is inserted, it is not possible to determine in which position the locking member is stopped. The control means sends a drive pulse signal for switching between the two states to the stepping motor in the subsequent control, even though it is stopped at the position where it is not in the unlocked state. Cannot be driven, and the phenomenon of poor switching of the locking member has occurred.

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 impossible 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, which is disadvantageous in terms of space and cost, and is 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 an expensive means for detecting the position of a moving member without providing an expensive means.
It is an object of the present invention to provide a position control device that can appropriately control the position of a moving member even when the moving member has been stopped due to an impact or the like.

A second object of the present invention is to eliminate the need for providing an expensive means for detecting the position of the locking means, and to prevent the locking means from being displaced due to impact or the like. An object of the present invention is to provide a correction optical device that can appropriately perform position control.

[0015] A third object of the present invention is that while the correction optical system is erroneously driven by the user, the device is detached from the main unit having the power supply, and the locking means is in the proper position. The present invention aims to provide a correction optical device that can reliably move a locking means to a desired state without giving a user a sense of incongruity even when stopped at a place other than the above. Is what you do.

A fourth object of the present invention is to provide a state in which the locking means stops at a place other than the proper position because the power is turned off while the correction optical system is being driven by a user by mistake. Even
It is an object of the present invention to provide a correction optical device that can surely move a locking unit to a desired state without giving a user an uncomfortable feeling when the power is turned on again.

[0017]

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 a driving signal to the stepping motor when the moving member is moved is selected from a plurality of types and output. A position control device having a drive control unit that moves the moving member, whether the moving member is located at the first or second position, or is located at another location. , The drive energization to the stepping motor can be selectively performed.

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 blur caused by a shake, a locked state in which the correction optical system is locked 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, and the locking means. And a drive control unit for selecting and outputting a drive signal to the stepping motor for moving from among a plurality of types. Depending on whether the stop means is located in the first or second position or elsewhere,
The drive current supply to the stepping motor can be selectively performed.

In order to achieve the third object,
The present invention according to claims 4, 6 and 7 further comprises a connection state detecting means for detecting that the correction optical device is connected to the main apparatus having a power supply, and the correction optical device is connected to the main apparatus by the connection state detecting means. If it is detected that the first drive signal has been detected, the first drive signal is selected as a drive signal to the stepping motor; otherwise, the drive control means selects a second drive signal different from the first drive signal. Correction optical device.

In the above configuration, when it is detected that the correction optical device is connected to the main unit, the driving signal to the stepping motor is longer than the second driving signal in terms of the energizing pulse interval or the applied voltage. A large first drive signal is output to the stepping motor. This is when the user accidentally drives the correction optical system, the device is disconnected from the main device having the power supply, and it is detected that the correction optical device is connected to the main device. This is because the locking means may be stopped at a place other than the regular position, and even in such a situation (a situation where the energized phase and the actual position of the stepping motor are shifted), By outputting the first drive signal, the locking means can be moved to follow the drive pulse.

In order to achieve the fourth object,
The present invention according to claims 5 to 7 further comprises a power supply state detecting means for detecting a state of power supply, wherein the power supply state detecting means detects that power supply to the correction optical device has been started. In the case where the correction is performed, a first drive signal is selected as a drive signal to the stepping motor, and in other cases, a second drive signal different from the first drive signal is selected. It is an optical device.

In the above configuration, when the start of power supply to the correction optical device is detected, a drive signal to the stepping motor is supplied with a larger energizing pulse interval than the second drive signal or an applied voltage. A large first drive signal is output to the stepping motor.
This means that the power is turned off (due to the removal of the battery) while the user mistakenly drives the correction optical system, and the power supply to the correction optical device is started (a new battery is inserted). This is because the locking means may be stopped at a place other than the normal position when such a situation is detected (for example, when the energized phase is shifted from the actual position of the stepping motor). By outputting the above-mentioned first drive signal even under the situation, the locking means can be moved to follow the drive pulse.

[0023]

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 the figure, 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 for explaining the mechanical configuration of the correction optical device and the operation of the stepping motor in the image blur correction device according to one embodiment of the present invention, and FIG. 2 is a diagram showing the correction optical device. FIG. 3 is an exploded perspective view showing main components of the correction optical device. FIG. 3 shows a correction optical device viewed from the left side in FIG. 2 (the hard substrate 111 is removed so that the inside can be seen for the sake of explanation). 4 (a) is the arrow A in FIG.
FIG. 4B is a diagram showing the configuration of a portion relating to position detection of the correction lens 11, and FIG. 5 is a diagram BB 'in FIG.
5A is a plan view and a sectional view showing a part of FIG. 5B in an enlarged manner, and FIG. 6 is a plan view of the coil unit.
FIG. 7 is a diagram showing a side surface and a cross section, FIG. 7 is a diagram for explaining the configuration of a drive unit for shake correction in the present embodiment in comparison with a conventional configuration, and FIG.
FIG. 9 shows the support frame 12 and the base plate 13 shown in FIG.
FIG. 10 is a diagram showing the lock ring 113 and the rolling restricting ring 112 shown in FIG. 2 and the like as seen from the surface shown in FIG. 3, and FIG. FIG. 12 is an exploded perspective view showing the components of the stepping motor 19 when the support frame 12 is locked by the ring 113, and FIG. FIG. 14 is a timing chart of coil energization in the stepping motor 19, and FIG. 15 is a diagram showing the relationship between the stop position of the stepping motor 19 and the 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, 14y (yoke 15p,
15y, which is hidden by 15y)
15y is fixed by caulking or screwing.

Reference numeral 13 denotes a base plate, and coils 16p and 16y are attached to the surface of the base 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, 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
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 changing the above-mentioned rollers 17 into eccentric rollers as shown in FIG. 5A (FIG. 5A is described above). FIG.
(B) is a partially enlarged plan view and cross-sectional view). That is, by rotating the roller 17, the arm 12 a moves back and forth in the optical axis direction. Therefore, by adjusting the position of the three arms 12 a in the optical axis direction by the roller 17, the inclination of the correction lens 11 is adjusted. It is possible to make the roller 17 unrotatable with the arm 12a by tightening the screw 17a after the adjustment.

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 a base plate 13 (see FIG. 3) has holes 13m (see FIG. 3). The lock ring 113 can be driven in the rotation direction by meshing with the rack 113a penetrating through FIG. 9 (b).
At this time, the allowable rotation range of the lock ring 113 is
The range is limited to the range between the end surface 13n of the third hole 13m in the rotation direction and the end surface 113e of the rack 113a of the lock ring 113 (see FIG. 10A-1). 4 provided on this lock ring 113
The cam portion 113b at the location is a four-point projection 1 shown in FIG.
By locking and unlocking the support frame 12 in relation to 2b, it 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 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-mentioned 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 employed to reduce the influence of the rolling.

FIG. 9 (b) is a view of only the base plate 13 of FIG. 3 as viewed from the back, and 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.

[0046] 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) nail rolling regulating ring 112 is provided at the main plate 13 1
At 3k (see FIGS. 5B and 9B), the engagement is elastically restricted in the optical axis direction. The shaft portions 112a ₁ , 112a ₂ , 112a ₃ of the rolling restricting ring pass through the base 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 ( a)
(See FIG. 5B). Again, slot 1
The 2c ₁ and the shaft portion 112a _1, 12c ₂ and the shaft portion 112a ₂ in the fitting relationship, by setting a large elongated hole 12c _3,
Avoid double mating. 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 is 114
It can move only in the p direction.

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 attached to 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 described above, the position detecting means attached to the hard substrate 111 includes the Hall elements 110p and 11p.
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 of (six) 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 divided 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.

196 is used to position and support the stator yoke 191 and the stator yoke 192,
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 has the claw portions 197a to 197d formed in 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.

Connecting 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 the 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 poles indicated on the stator yoke 192 are 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 a 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 operation principle as described above. 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 the states of the energized 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 figure, the position where the rotor 193 can be stopped without energizing (one-phase energizing position) is indicated by a white circle, and the position where two coils are energized and stopped simultaneously (two-phase energizing position) is indicated by a black circle. Shows the energized phase at that position.
11A shows the position where the lock ring 113 is locked as shown in FIG. 11B, and FIG. 11B shows the 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.

The position c is where the end surface 13n in the rotation direction of the hole 13m of the base plate 13 and the end surface 113e of the rack 113a of the lock ring 113 are in contact with each other (the rotation of the lock ring 113 is mechanically restricted). In the present embodiment, the position of the rotor 193 in the locked and unlocked state is outside the range between the locked and unlocked positions of the rotor 193 in the locked and unlocked state (positions a and b). The end surface 113e of the main plate 113a is set so as to be shifted by about three steps to the position shown in FIG.

FIGS. 16 and 17 are diagrams showing the energization pattern to the stepping motor 19 and the actual movement of the rotor 193 (that is, the movement of the lock ring 113) in the present embodiment described with reference to FIGS. It is. FIG. 16 is a view showing the movement when the lock ring 113 is moved from the unlocked state to the locked state, and FIG. 17 is the view when the lock ring 113 is moved from the stopped state to the locked state. It is a figure showing movement. In the figure, the horizontal axis represents time, and the vertical axis represents the position of the rotor 193 (the position of the lock ring 113) or the state of energization to the stepping motor 19 corresponding to that position, and the line represents the state of energization to the stepping motor 19. And the line is the rotor 193
(Lock ring 113).

First, an energization pattern to the stepping motor 19 will be described with reference to FIG.

First, the energization phase (A phase) at the unlocked position is energized for a certain time. Thereafter, as described with reference to FIG. 13, the energization phase is sequentially performed up to the energization phase (24 steps) at the locking position while the energization phase is advanced in the drive direction by one step at a time T1. At this time, the energization phase (A phase) at the locking position, which is the stop target position, is energized for a longer time than the energization time in each step during the drive up to that time.

Next, the actual movement of the rotor 193 according to the above-described energization pattern will be described.

In FIG. 16, if the lock ring 113 is in the unlocked state, it remains stopped during the first energization of the A-phase, and a shift due to a large impact exceeding the detent torque of the stepping motor 19 occurs. During this energization time, the motor is driven to the normal unlocked state. Next, the energization during driving to the locking position causes a delay in following the energized phase in several steps of starting movement, but thereafter, the energization is driven substantially in accordance with the advance of the energized phase. Then, when the advance of the energizing phase is stopped and fixed at the stop position, which is the stop target position, the phase temporarily passes (overshoots) due to the inertia, but is immediately pulled back to reverse the lock position again due to the inertia. Passing to the side, pulled back. This motion is repeated several times and gradually attenuates, and finally stops at the stop position, which is the stop target position.

The state in which the lock ring 113 is moved from the unlocked position to the locked position has been described above.
The driving direction (the direction in which the energizing phase advances) may be changed from the locked state to the unlocked state.

In the present embodiment, the energization phase in the first locked or unlocked state of the energization of the drive (the originally expected state before driving) is energized for a certain period of time. Even in the case where a deviation occurs (in such a case, it is usually shifted by one step from the originally expected state), the actual driving can be performed after returning to the originally expected state. It can be driven reliably without any occurrence.

Further, the energization time at the stop target position is set longer than the energization time in each step during driving, so that the overshoot due to inertia is reliably attenuated before the energization is stopped. A reliable drive can be performed without variation.

Further, the stop position (a or b) and the mechanical restriction position (c) in the locked state or the non-locked state are set to be larger than the amount of overshoot generated at the time of stopping the drive, so that it is stable. In addition, it is possible to prevent the occurrence of unpleasant noise due to mechanical hit.

Next, with reference to FIG. 17, a description will be given of a drive from a partially stopped state (a state where it is unknown where the vehicle is stopped) to a locked state.

The sequence of switching the energized phase of the drive pattern (line) is the same as that described with reference to FIG. 16, and a description thereof will be omitted. In this case, the time interval for advancing the energized phase is T2 (T2
> T1).

Next, the rotor 193 (lock ring 11)
The state of the actual movement of 3) will be described. Assuming that the position before the drive is the position (position e) of the ninth step in the locking direction from the non-locking position (produced by power supply being cut off during image blur correction), the A-phase During this energization time, the motor is driven to the position of the eighth step (position d), which is the closest A-phase position, and thereafter, the current phase leads the line by eight steps in the same energized phase as the line. It is driven along the line towards the locking position.

However, while the drive energization is performed for 24 steps, there are only 16 steps (from the position d to the position a) up to the locking position, so that the motor passes the locking position which is the target stop position. Once a mechanical hit bounces back, but is immediately pulled back along the line. And
Again, it bounces off mechanically, but this time the line is closer than the line (the force trying to move along the line is stronger than the force trying to move along the line)
It is pulled in the direction along the line.

That is, as described above, the lock ring 113
And the end surface 113e of the main plate 113a is set so as to be shifted from the position of the rotor 193 in the locked state (position a) by about three steps outside the range between the non-locked state and the locked state. Before reaching the half cycle of the energizing phase of the step motor 19 (4 steps in the embodiment, corresponding to 1/6 rotation) (in the example of FIG.
13 (d) corresponding to the step ahead / when the A and B phases are energized, mechanical rebounds and rebounds are repeated. During this repetition, the energized phase advances and the A phase is energized. (From / A / B above / A → /
(Because the current-carrying phase advances as A./B.fwdarw.A./B.fwdarw.A), the force to move along the line increases, and the wire is pulled in the direction along the line.

When the advance of the energized phase is stopped and fixed at the stop position, which is the stop target position, the inertia temporarily passes through the stop position (overshoot) due to inertia.
Is immediately pulled back and again passes the locking position to the opposite side by inertia and is pulled back. This movement is repeated several times and gradually attenuates, and finally stops at the stop position, which is the stop target position.

In the above description, it was assumed that the position before driving was the position of the ninth step (position e) in the locking direction from the non-locking position, but stopped at other positions. Even in this case, when the first A-phase energization ends, the rotor 193 is turned off.
(Lock ring 113) has four A phases (a (locked position), b (unlocked position), d (eighth step), a and d
(The position of the 16th pulse in the example of FIG. 17) may not be present at any position. However, even in this case, the time interval in which the energized phase is advanced is set to a time interval T2 (T2>) at which the rotor 193 can follow the energized phase from the time when the energized phase and the actual position of the rotor 193 match.
Since it is set to T1), it moves according to the drive pattern until it hits the machine (except when it is at the position b), and after the mechanical hit, it moves to the nearest drive pattern energized phase position. Finally, it stops at the locking position (position a).

In this embodiment, at the beginning of the energization of the drive, the energization phase in the non-locked state (the original state before the drive) should be energized for a certain period of time. Even in this case, since the actual driving can be performed after being moved to the position of the same energization phase as that in the unlocked state, the movement can be reliably started without any trouble such as step-out.

Further, the locking position (a or b) and the mechanical contact position (c) are set to be smaller (about 3 steps) than a half cycle (4 steps) of the conduction phase cycle (8 steps). Finally, it is possible to stop at the locking position by energizing the locking position, which is the target stop position.

Further, the energizing time at the target stop position is set longer than the energizing time in each step during driving, and the irregular behavior due to overshoot due to inertia or bouncing upon mechanical hit is reliably attenuated. The energization is stopped, and there is no variation in the stop position, so that reliable driving can be performed.

As described above, in the present embodiment, the locking drive and the unlocking drive can be reliably performed regardless of where the rotor 193 (lock ring 113) is stopped. No need to do. Also,
In order to reduce the generation of shock or sound at the time of mechanical hit, the end face 13 in the rotation direction at the hole 13m of the base plate 13
n or the rack 11 in the lock ring 113
At least one of the end surfaces 113e of 3a may be formed of a shock absorbing member such as an elastic member.

FIG. 18 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. 1 is a block diagram illustrating an electrical configuration of a lens interchangeable autofocus (AF) single-lens reflex camera system.

In the figure, reference numeral 200 denotes a camera main body, and 300 denotes an interchangeable lens main 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 first stroke switch of the release switch 204 is O
N (SW1 signal is generated)
In accordance with a ranging start command transmitted from the PU 201, a subject existing in the ranging area is measured, and the amount of movement of the focusing lens necessary to focus on the object is determined.
Transmit to U201.

Reference numeral 303 denotes an image stabilizing operation switch (hereinafter, referred to as an IS switch) that can be operated from the outside, and selects whether or not to perform an image stabilizing 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 detection means 305c for detecting the position of the moved correction lens 11, and the fourth is mainly a stepping motor 19, a lock ring 113, a support frame 1
2 projections 12b, and the correction lens 1
A locking means 305d capable of locking the lens 1 at a predetermined position (optical axis center position), and a fifth driving means 3 comprising a stepping motor 19 for driving the lock ring 113.
05e.

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 in accordance with 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. 19 is a flowchart showing main operations 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, the camera body 20
When it is determined that communication between the camera body 200 and the lens body 300 has started (eg, when the lens body 300 is attached to the lens CP0) (YES in # 5001), the lens CP
U301 is a locking means 305 in the correction optical device 305.
The stepping motor 19 as a component of FIG.
Pulse interval T2 (second drive pattern) described in
Is performed to drive the lock ring 113 to the locked state (# 5002).

As a result, as described above, the lock ring 11
Regardless of the state of 3, it can be reliably driven to the locked state.

Next, the camera CPU 201 determines whether or not the SW1 signal is generated in the release switch 204 (# 5003). If the SW1 signal is generated, the lens CPU 301 turns on the IS switch 303 (selects the IS operation). It is determined whether the IS operation has been selected (# 5004). If the IS operation has been selected, the process proceeds to step # 5005, and if not, the process proceeds to step # 5019. In step # 5005, the lens CPU 301 starts the internal timer, and then the camera CPU 201 executes photometry, AF (ranging operation), lens CP
The energizing pulse described in FIG. 16 is supplied to the stepping motor 19 so that U301 starts AF (focusing operation), shake detection, and further releases the locking means 305d to enable shake correction control by the driving means 305b. Drive energization is performed at an interval T1 (first drive pattern) (# 5006).

Next, the lens CPU 301 checks whether or not the content of the time counted by the timer has reached a predetermined time t _1. If it has not, the process stays in this step until it reaches (# 5).
007). 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 (# 5008).

Next, the camera CPU 201 checks whether or not the SW2 signal is generated in the release switch 204 (# 5009), and if not, determines whether or not the SW1 signal is generated again (# 5009). 5011) If the SW1 signal is not generated, the lens CPU 301
Stops the vibration correction control (# 5012), and locks the correction optical system 305a at a predetermined position (the optical axis center position), that is, the stepping motor 1
9 is energized in the first drive pattern (# 501).
3).

If it is determined in step # 5009 that the SW2 signal has not been generated, but it is determined in step # 5011 that the SW1 signal has been generated, step # 5009 is executed.
Return to If it is determined in step # 5009 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 (# 5010). Next, the camera CPU 201 checks the state of the SW1 signal (# 501).
1) If the SW1 signal is no longer generated, the lens CPU
301 stops the shake correction control (# 5012), and moves the correction optical system 305a to a predetermined position (optical axis center position).
Driving means 305 so as to be locked by the locking means 305d.
Power is supplied to the stepping motor 19 in the first drive pattern b (# 5013).

After the above operation is completed, the lens CP
U301 do once reset and started again (# 5014), whether again SW1 signal is generated within a predetermined time t ₂ determines the timer (# 5015 → # 50
16 → # 5015 ...). 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 (# 5017), 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. (# 5008).

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, after stopping the shake correction, a predetermined time t
_{If the} SW1 signal is not generated within ₂ (# 501
5), the shake detection is stopped (the operation of the vibration detection device 304 is stopped) (# 5018). Then step #
The process returns to 5003 and enters a state of waiting for the generation of the SW1 signal.

If the IS operation is not selected in step # 5004, the camera CPU 201
The lens CPU 301 executes AF (focusing operation) (distance measurement operation) (# 5019).

Next, the camera CPU 201 checks whether or not the SW2 signal of the release switch 204 is generated (# 5020). If not, it is determined whether or not the SW1 signal is generated again (# 5020). 5022) If no SW1 signal has been generated, the flow returns to step # 5003 to enter a state of waiting for SW1 signal generation. Also, in step # 5020, no SW2 signal is generated, but SW1
If a signal has been generated, the process returns to step # 5020. Then, in this step # 5020, the release switch 20
4 detects that the SW2 signal has been generated, the lens C
PU 301 controls the aperture device 307, and at the same time, the camera C
The PU 201 performs an exposure operation on the film via the exposure circuit 206 (# 5021). Next, the camera CPU 20
1 checks the state of the SW1 signal (# 5022). If the SW1 signal has not been generated, the process returns from step # 5022 to step # 5003.

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.

(Correspondence between Invention and Example) In the above embodiment, the second drive pattern corresponds to the first drive signal of the present invention, the first drive pattern corresponds to the second drive signal of the present invention, Steps # 5002, # 5006, # 5013, # 501 of the lens CPU 301 in FIG.
In FIG. 7, the portion for selecting the second drive pattern or the first drive pattern corresponds to the drive control means of the present invention. Other means are as described above.

The present invention is not limited to the configurations of these embodiments, but may be any configuration that can achieve the functions described in the claims or the functions of the embodiments. Needless to say, this may be done.

(Modification) In the above embodiment, an example is shown in which the locked state and the unlocked state of the lock ring are switched. However, the present invention is not limited to this, and the stepping motor and the first A moving member that is moved by the stepping motor between a position and a second position,
The present invention is applicable to any device having a structure in which the moving member is controlled to move to the other position with the first position or the second position as an initial 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.

In the above embodiment, the difference between the first and second drive patterns is that the energization time is changed, that is, the drive pulse interval is changed. However, the magnitude of the voltage applied to the stepping motor is different. May be changed (because the suction force changes when the applied voltage is high).

As is clear 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. It is also possible to apply the present invention to a device that performs the above.

[0121]

As described above, according to the present invention,
Without providing an expensive means for detecting the position of the moving member, it is possible to provide a position control device capable of appropriately controlling the position of the moving member even when the stop of the moving member occurs due to an impact or the like. Things.

Further, according to the present invention, without providing an expensive means for detecting the position of the locking means, the position of the locking means can be maintained even when the locking means stops moving due to an impact or the like. It is possible to provide a correction optical device that can appropriately perform control.

Further, according to the present invention, while the correction optical system is erroneously driven by the user, the device is detached from the main unit having the power supply, and the locking means is out of the normal position. Even if it is stopped at a place, it is possible to provide a correction optical device that can surely move the locking means to a desired state without giving a user a sense of incongruity when re-mounted. is there.

Further, according to the present invention, there is provided a state in which the locking means stops at a place other than the normal position because the power is turned off while the correction optical system is being driven by mistake. Also,
An object of the present invention is to provide a correction optical device that can surely move a locking unit to a desired state without giving a user an uncomfortable feeling when the power is turned on again.

[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 view for explaining a state when the lock ring positioned in the locked state is driven to the unlocked position by the stepping motor of FIG. 12;

FIG. 17 is a view for explaining a state in which the lock ring in a partially stopped state is driven to a non-locking position by the stepping motor of FIG. 12;

FIG. 18 is a block diagram illustrating 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.

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

[Explanation of symbols]

 Reference Signs List 11 correction lens 12 support frame 12b cam portion 13 base plate 13b cam portion 13m hole 14p, 14y permanent magnet 19 stepping motor 113 lock ring 113a rack 113e end face 191, 192 stator yoke 193 rotor 301 lens CPU 305 correction optical device 305a correction optical system 305c Position detecting means 305d Locking means 305e Driving means

Claims (7)

[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; and a driving signal to the stepping motor when moving the moving member. And a drive control means for selecting and outputting from a plurality of types. 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 the shake, and a locked state in which the correction optical system is locked so as not to be moved and a movable non-locked state set. Locking means, 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, and a moving means for moving the locking means. And a drive control means for selecting and outputting a drive signal to the stepping motor from a plurality of types. 4. A connection state detecting means for detecting that the correction optical device is connected to a main body device having a power supply, wherein the drive control means is connected to the main body device by the connection state detection means. When the fact is detected, the first drive signal is selected as the drive signal to the stepping motor,
4. The correction optical device according to claim 3, wherein in other cases, a second drive signal different from the first drive signal is selected. 5. A power supply state detecting means for detecting a state of power supply, wherein the drive control means detects that power supply to the correction optical device has been started by the power supply state detecting means. Wherein a first drive signal is selected as a drive signal to the stepping motor, and a second drive signal different from the first drive signal is selected otherwise. 3. The correction optical device according to 3. 6. The driving signal of the first driving signal, wherein an interval of energizing pulses to the stepping motor is set larger than that of the second driving signal.
Or the correction optical device according to 5. 7. The correction optical system according to claim 4, wherein a voltage applied to the stepping motor of the first drive signal is set higher than that of the second drive signal. apparatus.