JPH0980542A - Image moving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image moving device whose power consumption is low. SOLUTION: This device is provided with a frame body holding at least a part of a photographing optical system, a holding mechanism holding the frame body, a driving mechanism 13 driving the frame body on a plane perpendicular to an optical axis, a drive circuit 9 driving the driving mechanism, a control part 6a controlling the drive circuit, and a power supply source 10 supplying power to the driving mechanism through the drive circuit. In the case a distance between the center of the optical system held by the frame body and the optical axis is equal to or above a specified value decided according to the optical characteristic of the photographing optical system and the moving range of the optical system held by the frame body in a natural state, the control part controls the drive circuit so that the distance may attain a specified value and decides the initial position of the driving center of the frame body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image moving apparatus which corrects a blur of a subject image by moving the subject image on a photographing surface of a photographing optical system.

[0002]

2. Description of the Related Art Conventionally, in a photographing device such as a camera, when a photographer moves a little while photographing a subject image (during exposure),
The subject image on the shooting surface moved, and the obtained photograph was a so-called blurred photograph with unclear outlines. On the other hand, recently, during exposure, by moving the image blur correction optical system, which is a part or all of the photographing optical system, so as to cancel the movement of the photographer, the blurring of the subject image on the photographing surface is prevented. An image moving device that does (hereinafter referred to as "blurring correction") is being researched and developed.

As such an image moving device, a blur correction optical system (hereinafter referred to as "VR lens") is moved in a plane perpendicular to the optical axis of the photographing optical system to perform blur correction. There is an apparatus disclosed in Kaihei 3-110530. In this device, a VR lens is supported by an XY stage in a plane perpendicular to the optical axis, and two DC motors are used as drive sources for driving the VR lens.
The rotation of the DC motor is decelerated by a predetermined reduction gear, converted into two linear motions that are not parallel to each other by a lead screw or the like, and then transmitted to the XY stage. As a result, the VR lens is driven in the plane substantially orthogonal to the optical axis.

On the other hand, when the XY stage is used as described above, the VR lens may not move smoothly due to friction or the like generated in the XY stage. Therefore, recently, in order to solve such a problem and ensure smooth movement of the VR lens, a method of supporting the VR lens in the lens barrel with an elastic body is used. Specifically, a plurality of cylindrical elastic bodies are arranged in the lens barrel so that their cylindrical axes are parallel to the optical axis, and the VR lens is cantilever-supported at their ends. By doing so, the VR lens moves smoothly within the plane defined by the end of the elastic body.

Further, when a rotary motor such as a DC motor is used as a drive source, it is essential to use a gear to decelerate the rotational movement of the motor to convert it into a linear movement. However, it is difficult to avoid the generation of noise with these gears. On the other hand, in recent years, there is a strong demand for quietness during use, especially in home-use photographing devices. For this reason, it is proposed that the drive source of the VR lens adopts a voice coil motor (hereinafter, referred to as “VCM”) that can directly apply the driving force to the VR lens without a mechanical mechanism. Has been done. Here, VCM is
It is a motor that generates a driving force by using an electromagnetic force generated by an electric current and a magnetic force, and is characterized by generating a linear driving force having a magnitude proportional to a value of a current that has been applied.

[0006]

However, in the above-described conventional image moving apparatus, in order to support the VR lens by the elastic body, for example, when the photographing device is set so that the cylindrical axis of the elastic body is horizontal. The VR lens moves downward by gravity due to the action of weight, and the center of the VR lens does not coincide with the optical axis in a natural state. For this reason, the conventional image moving apparatus operates the VCM to keep the center of the VR lens aligned with the optical axis even when no shake correction is performed, and generates a force against gravity. There was a need. As a result, the conventional image moving apparatus consumes a large amount of power, and has a problem that the battery life is shortened, for example, in a portable image-taking device including only a battery having a limited capacity.

On the other hand, with respect to the above problem, for example, the start position of image blur correction drive (hereinafter referred to as “VR drive”) is set to VR.
A method has been proposed in which the elastic force of the elastic body that supports the lens and the gravity acting on the VR lens or the like are balanced. However, when the VR drive is performed according to this proposal, the VR lens moves to a position further away from the optical axis in the gravity direction because the initial position of the VR lens deviates downward from the optical axis by gravity. It becomes possible to do. As a result, there is a problem that when the VR lens is driven in the gravitational direction, the image is likely to be deteriorated due to the aberration, and when the driving is stopped in a range where the aberration does not occur, the correctable range becomes narrow.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 proposes a frame body (22, 23) for holding at least a part of a photographing optical system, and a frame body (22, 2).
3) is held in a plane substantially perpendicular to the optical axis of the photographing optical system, and a force corresponding to the distance between the optical axis and the center of the optical system held by the frame (22, 23) is applied to the frame (22). , 23) acting on the holding mechanism (36, 37, 38, 39) and a force corresponding to the supplied electric power to generate the frame body (22, 2).
3) two or more drive mechanisms (13) for driving the same in directions not parallel to each other in the plane, and two or more drive mechanisms (1
At least one drive circuit (9) for driving 3),
An image moving apparatus having a control unit (6a) for controlling a drive circuit (9) and a power supply source (10) for supplying power to two or more drive mechanisms (13) via the drive circuit (9). , The control unit (6a), in the natural state, the frame (2
2,23) the distance between the center of the optical system and the optical axis is
A drive circuit (9) so that the distance becomes a predetermined value when it is a predetermined value or more determined by the optical characteristics of the photographing optical system and the moving range of the optical system held by the frame bodies (22, 23).
Is controlled to determine the initial position of the drive center of the frame body (22, 23).

According to a second aspect of the invention, in the image moving apparatus according to the first aspect, further, in order to limit the total value of the electric power supplied to the two or more drive mechanisms (13),
It is characterized by including a supply power limiting section (7) for limiting the power supplied to the drive circuit (9) to a certain value or less by detecting the current or voltage from the power supply source (10). Furthermore, the invention according to claim 3 is the image moving apparatus according to claim 1 or 2, characterized in that the predetermined value is a value related to the aberration of the imaging optical system.

[0010]

Embodiments of the present invention will be described below in more detail with reference to the drawings. FIG.
FIG. 4 is a block diagram illustrating a configuration of a camera using the image moving device according to the present invention. The power supply 10 supplies power to this embodiment by turning on a main switch (not shown). The switch S1 is a switch that is turned on when the release button is half-pressed, and the switch S2 is turned on when the release button is fully pressed. In the present embodiment, when the switch S1 is turned on, preparation for photographing such as adjustment of the shutter speed and focal length is performed, and when the switch S2 is turned on, a release operation is performed and exposure is started.

The CPU 6a detects the light quantity of the object A
E sensor (not shown), AF that detects the distance to the subject
In addition to sensors (not shown) and the like, it is an electronic circuit that controls the VR sensors 3a and 3b and the position detection sensors 34 and 35, or detects and processes the outputs of these sensors. Here, the VR sensor 3 is a sensor that detects camera shake, and
The U6a detects the posture (position, velocity, acceleration, angle, angular velocity, angular acceleration, etc.) of the camera at that moment based on the output of the VR sensor 3. In addition, the position detection sensor 3
Reference numerals 4 and 35 are sensors for detecting the position of the lens frame 23 described later.

The CPU 6b is an electronic circuit that controls the exposure amount control section 4, the AF control section 5, and the winding section 8 based on the detection results of the AE sensor, the AF sensor, etc. transmitted from the CPU 6a. Here, the exposure amount control unit 4 adjusts the exposure amount at the time of shooting by controlling an aperture mechanism and a shutter mechanism (not shown) based on the detection result of the AE sensor. The AF controller 5 controls the focusing operation of an optical system (not shown) based on the output of the AF sensor. Further, the winding unit 8 is for winding the film after the photographing is completed.

The actuators 13a and 13b are for driving the lens frame 23 in a plane substantially perpendicular to the optical axis, and in this embodiment, a VCM is used. Details of the VCM will be described with reference to FIG. The drive circuit 9 receives a control signal from the CPU 6a via the limiting unit 7 so that the actuators 13a, 13a
It is a circuit for driving b.

Further, the limiting section 7 detects the current supplied from the power source 10 to the drive circuit 9, and the value thereof, that is, the total value of the currents supplied to the actuators 13a and 13b is a predetermined value (hereinafter, "set value"). It is a circuit that limits it so that it does not exceed the above. Here, the setting value of the limiting unit 7 is set to a value according to the power supply 10 used by the camera. That is, in the present embodiment, the setting value of the limiting unit 7 is the power supply 10
Of the energy remaining from the electromotive force of the power source 10, etc., depending on the type (large power source externally connected to the camera, or small dry battery built in the camera, etc.) The amount is detected and changed stepwise based on the detection result.

2 and 3 are views for explaining the mechanism for driving the VR lens of this embodiment, and FIG.
FIG. 3 is a front view of a mechanism including an R lens, and FIG. 3 is a sectional view taken along line AA of FIG. The circular member drawn in the approximate center of FIG. 2 is the VR lens 21 of this embodiment. VR lens 2
1 is held by the lens chamber 22 on its outer periphery,
Further, the lens chamber 22 is held by the lens frame 23 on the outer circumference.

The elastic members 36 to 39 are metal wires or the like for supporting the lens frame 23 in the lens barrel. The elastic body 36 is installed parallel to the optical axis, and each length is
It is almost the same. Therefore, the lens frame 23 supported by these is movable in an arbitrary direction within a plane substantially perpendicular to the optical axis, and as a result of the movement, the lens frame 23 does not tilt with respect to the plane.

Coil 24, magnet 26, yokes 28, 40
(Or, the coil 25, the magnet 27, the yokes 29, 41)
Is an actuator 13 shown in FIG. 1 and constitutes a so-called voice coil motor (VCM). The coils 24 and 25 are coil members made of elongated conductor wires, and are similar to an athletics track composed of two linear portions parallel to each other and two semicircular portions connecting the ends of the respective linear portions. It has a shape. Coils 24, 25
The vertical bisector of each straight line is the VR lens 21.
Are attached to the outer edge portion of the lens frame 23 so as to intersect each other at a substantially right angle in the substantially center of.

The yokes 28, 40 and the magnet 26 are members for forming a magnetic field that traverses the coil 24 in the optical axis direction. The yoke 28 and the yoke 40 sandwich the magnet 26 in the optical axis direction, and The yoke 28 and the magnet 26 are the coil 2
4 are arranged so as to be sandwiched in the optical axis direction. Similarly, the yokes 29 and 41 and the magnet 27 are members for forming a magnetic field that crosses the coil 25.
The magnet 1 is arranged so as to sandwich the magnet 27 in the optical axis direction, and the yoke 29 and the magnet 27 are arranged so as to sandwich the coil 25 in the optical axis direction.

On the other hand, the coils 24 and 25 are connected to the drive circuit 9 described above, and are supplied with current from the power source 10 via the drive circuit 9. When a current flows through the coil 24 (25), an electromagnetic force (hereinafter referred to as "thrust") is generated between the current and the magnetic field generated by the magnet 26 (27). This thrust changes its direction depending on the direction of the current flowing through the coil 24 (25), and increases or decreases its magnitude in proportion to the magnitude of the current.

The lens position detector 30 (31) is a vertical bisector (x axis) of the straight part of the coil 25 on the side surface of the lens frame 23 (vertical bisector of the coil 24 (y axis)). ) Is a protrusion located on the extension of the slit, and a slit 32 (33) through which a light beam that travels substantially in the optical axis direction can be transmitted through the center thereof.
have.

The photo interrupter 34a (35a) is
It is a member mainly composed of a light projecting section and a light receiving section, and the lens position detecting section 30 (31) is formed by the light projecting section and the light receiving section.
Are installed so as to be sandwiched in the optical axis direction (see FIG. 3).
By arranging in this way, the photo interrupter 3
4a (35a) is irradiated by the light projecting unit and the slit 32
It is possible to detect the amount of movement of the lens frame 23 in the x-axis direction (y-axis direction) by detecting the light transmitted through the light receiving section. Information regarding the amount of movement of the lens frame 23 detected by the photo interrupter 34a is
It is fed back to the CPU 6a, and the CPU 6a outputs a new control signal for controlling the actuator 13 to the drive circuit 9 based on the feedback. In the present embodiment, by repeating such an operation, the VR lens 21 is arranged at a predetermined position and shake correction is performed.

Next, the operation of the drive mechanism of the VR lens 21 will be described. As described above, the drive circuit 9 which receives the control signal transmitted from the CPU 6a supplies appropriate currents to the coils 24 and 25 in order to drive the actuator 13. As a result, the VR lens 21 is attached to the coil 2
It is driven by the electromagnetic force (thrust) generated by the interaction between the electric currents flowing in the magnets 4, 25 and the magnetic fields generated by the magnets 26, 27. When the VR lens 21 moves from the center of the optical axis due to this thrust, the elastic body 36 that supports the lens frame 23.
˜39 bend, and a spring force in the direction toward the optical axis is generated.
As a result, the VR lens 21 moves to a position where the thrust generated by the coils 24 and 25 and the spring force generated by the elastic bodies 36 to 39 are balanced.

Actually, the mass of the entire mechanism for driving the VR lens causes a force in the direction of gravity to act on the elastic bodies 36 to 39, and also variously controls when the VR lens 21 is driven and controlled. Since the force is generated, the VR lens 21
It moves to a position where these forces and thrust are balanced. Furthermore, the VR lens 2 is attached to the coils 24 and 25.
Since the counter electromotive force is generated by the movement of 1, the thrust force generated by the VCM is reduced, and the VR lens 21 moves to a position where the reduced thrust force and the spring force are balanced.

On the other hand, in this embodiment, the coil 24 is provided by providing the limiting section 7 between the power source 10 and the drive circuit 9.
And 25, the total value of the currents supplied to 25 is limited to a certain value or less. For this reason, the drive range of the VR lens 21 is
Limited to a certain area. Therefore, the drive range of the VR lens 21 will be described below.

For the sake of simplicity, the lens frame 23 has a thrust force generated in the VCM and the VR lens 21.
It is assumed that only two types of force, that is, the spring force of the elastic body generated due to the movement of the (lens frame 23) act. First,
The thrust generated by the VCM increases in proportion to the current.
On the other hand, the spring force of the elastic body that opposes this thrust increases in proportion to the distance between the center of the VR lens 21 and the optical axis.

Here, when the currents Ia and Ib are applied to the coils 24 and 25, respectively, the center of the VR lens 21 moves to the position (x, y) in the coordinate system with the optical axis as the center. When the total magnetic flux density F1 generated in two VCMs including the coil 24 or the coil 25 is B and the length of the coil that can effectively generate an electromagnetic force by a magnetic force and a current is L, the following formula is obtained. Represented. F1 = Ia · B · L + Ib · B · L (1) However, in any VCM, B and L are assumed to be equal. Further, F1 represents only the size, not the direction.

On the other hand, the force F2 generated by the elastic body is a force kx in the x direction, where k is the spring constant of the entire elastic body.
It is the sum of the forces ky in the y direction and is represented by the following equation. F2 = kx + ky (2) If the total value of the currents flowing into the two VCMs is I, then I = Ia + Ib (3) Here, since the VR lens 21 is positioned at a position where F1 and F2 are in balance, the relationship of F1 = F2 (4) holds.

From the above equations (1) to (4), the relationship between the total value I of the currents flowing to the two VCMs and the central position (x, y) of the VR lens 21 is derived. FIG. 4 is a diagram showing the result, and the region surrounded by the range (1) in the figure is
The center of the VR lens 21 is a region that can be moved by VR driving. A range (3) in the drawing shows that when the center of the VR lens moves outside the range, the subject image on the photographic screen is affected by aberration and the image deteriorates. .

Here, the range (1) is enlarged or reduced according to the change of the set value of the limiter 7, that is, the change of I in the equation (3). That is, in the present embodiment, by appropriately setting the setting value of the limiting unit 7, it is possible to prevent a collision with a lens barrel or the like due to excessive movement of the lens frame 23, and to generate an unpleasant sound or a camera caused by an impact. It is possible to prevent such malfunctions. Further, limiting the supply current by the limiting unit 7 means limiting the electric power consumed by the actuator 13 or the like because the resistance value of the actuator 13 or the like is substantially constant. That is, in the present embodiment, the setting value of the limiting unit 7 is set to a value according to the power supply 10 used by the camera, thereby realizing power saving of the drive mechanism of the VR lens 21 and improving the life of the power supply 10. I am making it happen.

By the way, in the above calculation example, the gravity component is not taken into consideration, but in normal photographing, the camera is handled in a state where the optical axis is in a substantially horizontal direction, so that the VR lens and the VR lens drive mechanism are handled. A force in the direction of gravity is applied to. Therefore, in the natural state, that is, in the state where no current is supplied to the VCM, the center of the VR lens is at a position O below the optical axis O where the spring force of the elastic bodies 36 to 39 and the force in the direction of gravity balance. Located in the '. A range (2) shown in FIG. 4 represents a range in which the center of the VR lens 21 can be moved during VR driving in consideration of such influence of gravity. As shown in the figure,
The range (2) is a range in which the range (1) is moved in parallel to the downward direction of gravity.

Here, in the conventional image moving apparatus of this type,
The VR drive of the VR lens is performed according to the following two methods. The first method is to move the lens frame 23 upward in the gravity direction by applying a constant initial current (offset current) to the VCM that generates the driving force in the y direction before the photographing device enters the photographing state. The center of the lens 21 is superposed on the optical axis O. In other words, in this method, the initial position of the drive center of the lens frame 23 is set to the optical axis O. In this method, the image moving device performs the blur correction under the optically optimal condition, but on the other hand,
As pointed out in the conventional example, since the VCM is energized even when no shake correction is performed at all, the power consumption becomes large and the life of the power supply 10 becomes short.

The second method is to carry out blurring correction while the VR lens is moving downward in the gravity direction. According to this method, the power consumption is large as in the case of the first method. Never be. However, depending on the shooting conditions, a part of the range (2) in which the VR lens is movable (area pqr in the figure) deviates from the range (3), and as a result of blurring correction, the subject on the shooting surface Significant aberration effects can occur on the image.

On the other hand, in the present embodiment, V which generates the driving force in the y direction before the photographing device enters the photographing state.
By passing an offset current smaller than that in the first method to the CM, the center of the VR lens is overlapped with the point O ″. That is, the initial position of the driving center of the lens frame 23 is set not at the optical axis O but at the point O ″. Here, the point O ″ is a point on the line segment connecting the point O ′ and the optical axis O, and V is centered on that point.
This is a point that the moving range (4) of the center of the VR lens when the R drive is performed does not deviate from the range (3). By doing so, in the present embodiment, it is possible to completely prevent the influence of aberration or the like from occurring in the subject image due to blur correction. In addition, the present embodiment
Since the required offset current is smaller than that of the first method, the power consumption is small, and the life of the power supply 10 can be extended.

Next, the main operation of this embodiment will be described. FIG. 5 is a flowchart showing the operation of this embodiment.
In the present embodiment, when the release switch is half pressed after the main switch is turned on (S100) and the switch S1 is turned on (S110), the VR sensor 3, the AE sensor, and the AF sensor are detected.
Electric power is supplied to the sensors and the like, and these sensors are brought into an operating state (S120). Further, the exposure amount control unit 4 and the AF control unit 5 are also supplied with electric power to be in an operating state, and the AE sensor,
The shutter speed and the focal length are adjusted based on the output of the AF sensor (S120).

Next, according to the present embodiment, V
When the R mode is set (S130), the lens frame 23 is moved to x by driving the actuator 13.
Shaking in the axial direction and the y-axis direction, the position change of the lens frame 23 at that time is detected by the photo interrupters 34a and 35a. As a result, the amount of deviation between the center of the VR lens 21 and the optical axis and its direction are obtained (S140). Also, VR
Based on the output of the sensor 3, the drive amount of the VR lens 21,
The driving speed, the driving direction, and the like are calculated by the CPU 6a (S150).

After that, when the release button is fully pressed and the switch S2 is turned on (S160), the mirror-up operation is performed (S170). Next, in preparation for the VR operation, an operation of superimposing the center of the VR lens 21 on the above-mentioned point O ″ is performed (S180). Specifically, the amount of deviation between the center of the VR lens 21 and the optical axis detected in S140 is
It is compared with a predetermined distance stored in advance in a storage unit (not shown), that is, the distance between the point O and the point O ″. As a result, if the former is larger than the latter, the VR lens 21
The center of is moved to point O '', in the latter case VR
The lens 21 is not moved.

Further, a control signal is transmitted from the CPU 6a to the drive circuit 9, the drive circuit 9 drives the actuator 13 based on this signal, and VR drive is started so that the subject image does not move on the photographing surface ( S190). Also, V
Immediately after the R lens 21 is driven, the exposure amount control unit 4 controls a shutter mechanism or the like to expose a film (not shown) according to a predetermined exposure amount obtained from the output of the AE sensor ( S200). End of exposure (S21
After 0), VR driving is finished (S220), and the VR lens 21 is moved to a position where the center thereof overlaps the point O ″ (S230). Further, after performing the mirror down (S240), it is determined whether or not the continuous shooting mode is set (S250). If not set, all the operations of the present embodiment are ended.

(Other Embodiments) The present invention is not limited to the above embodiment. The above embodiment is an exemplification, and has substantially the same configuration as the technical idea described in the scope of the claims of the present invention. It is included in the technical scope of the invention.

In the above embodiment, the limiting section 7 limits the total current supplied to the actuators 13a and 13b to a predetermined value or less.
Since the resistance value of the R sensor 3 is substantially constant, even if the voltage applied to the actuators 13a and 13b is limited to a predetermined value or less, the same effect can be obtained. In addition, the limiting unit 7 includes the actuator 13
The current (voltage) supplied to a and 13b may be independently limited to a predetermined value or less. In this case, the movable range of the VR lens 21 is a region as shown in a range (3) shown in FIG.

[0040]

As described in detail above, according to the invention of claim 1 or 3, in the natural state, the control unit takes an image of the distance between the center of the optical system held by the frame and the optical axis. When the distance is equal to or more than a predetermined value determined by the optical characteristics of the optical system and the movement range of the optical system held by the frame, the drive circuit is controlled so that the distance becomes the predetermined value, and the initial position of the drive center of the frame is set. Since it is decided, it is possible to completely prevent the subject image from being affected by aberrations and the like due to the shake correction, and to reduce the power consumption and increase the life of the power supply source. It is possible to provide an image moving device. Further, according to the invention of claim 2 or 3, the frame body that holds at least a part of the photographing optical system is driven by two or more drive mechanisms that generate a force according to the supplied electric power, and the supplied electric power Since the limiting unit limits the total value of the electric power supplied to the two or more drive mechanisms to the predetermined value or less, it is possible to provide the image moving apparatus with low power consumption.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a configuration of an embodiment according to the present invention.

FIG. 2 is a front view illustrating a mechanism that drives a VR lens according to an embodiment of the present invention.

3A to 3A of a mechanism for driving the VR lens shown in FIG.
It is sectional drawing.

FIG. 4 is a schematic diagram showing a moving range of a VR lens according to an embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of the embodiment according to the present invention.

[Explanation of symbols]

3 VR sensor 6 CPU 7 Limiting unit 9 Driving circuit 10 Power supply 13 Actuator 22 Lens chamber 23 Lens frame 34, 35 Position detection sensor 36-39 Elastic body

Claims (3)

[Claims] 1. A frame body for holding at least a part of a photographing optical system, and an optical system for holding the frame body in a plane substantially perpendicular to an optical axis of the photographing optical system and for holding the frame body. A holding mechanism that applies a force corresponding to the distance between the center of the optical axis and the optical axis to the frame body, and a force corresponding to the supplied electric power to generate a force that is not parallel to each other in the plane. Two or more drive mechanisms that drive the two or more drive mechanisms, a drive circuit that drives the two or more drive mechanisms, a power supply source that supplies power to the two or more drive mechanisms via the drive circuits, and in a natural state, If the distance between the center of the optical system held by the frame and the optical axis is equal to or greater than a predetermined value determined by the optical characteristics of the photographing optical system, and the moving range of the optical system held by the frame, The drive circuit is controlled so that the distance becomes a predetermined value. And, image movement device, characterized in that it comprises a control unit for determining the initial position of the drive center of the frame. 2. The image moving apparatus according to claim 1, further comprising detecting a current or a voltage from the power supply source in order to limit a total value of electric power supplied to the two or more drive mechanisms. Accordingly, the image moving apparatus is provided with a supply power limiting unit that limits the power supplied to the drive circuit to a certain value or less. 3. The image moving apparatus according to claim 1, wherein the predetermined value is a value related to an aberration of a photographic optical system.