JP2015011108A - Image shake correction device, lens barrel, optical device and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To downsize an image shake correction device that drives a plurality of movable members and corrects an image shake.SOLUTION: An image shake correction device 100 comprises: a first movable unit 103 that holds a first correction lens 102; and a second movable unit 105 that holds a second correction lens 104. An amount-of-light adjustment part 110 disposed between the first movable unit 103 and the second movable unit 105 has a first notch part 1103 and a second notch part 1104, and the first movable unit 103 has a first coupling part 1031 and a second coupling part 1032. The second movable unit 105 has a third coupling part 1051 and a fourth coupling part 1052. A first movement member 106 is coupled to the first coupling part 1031 through the first notch part 1103, and rotates in a state where the first movement member is coupled to the third coupling part 1051. A second movement member 107 is coupled to the second coupling part 1032 through the second notch part 1104, and rotates in a state where the second movement member is coupled to the fourth coupling part 1052.

Description

  The present invention relates to an image blur correction apparatus mounted on an imaging apparatus such as a digital camera or an optical apparatus such as a lens barrel, binoculars, or a telescope.

An image shake correction apparatus mounted on a digital camera or the like moves a movable member holding a correction optical member such as a correction lens or an imaging element in two directions (yaw direction and pitch direction) orthogonal to the optical axis direction, Drive control is performed in a plane orthogonal to the optical axis.
The image blur correction device disclosed in Patent Document 1 is configured by effectively using the space in the lens group by connecting and driving two correction optical members with the light amount control device interposed therebetween, and the entire lens barrel. Miniaturization is realized.

JP 2010-164926 A

The image blur correction apparatus disclosed in Patent Document 1 has a problem that it is difficult to reduce the diameter, particularly when the amount of movement of the movable member is increased. The reason is that the area of the notch formed around the portion connecting the plurality of movable members increases in the proportion of the entire apparatus (details will be described later with reference to FIG. 7A). To do).
An object of the present invention is to realize a reduction in size of an image blur correction apparatus that drives a plurality of movable members to correct image blur.

  In order to solve the above problems, an apparatus according to the present invention includes a first correction member and a second correction member, and corrects image blur by moving the first correction member and the second correction member by a driving unit. An image blur correction device that holds the first correction member, has a first movable member having a first connecting portion and a second connecting portion, holds the second correcting member, and has a third connecting portion and a fourth connecting member. A second movable member having a connecting portion, a first guide portion that is disposed between the first movable member and the second movable member and guides the first connecting portion, and a second guide that guides the second connecting portion. A guide part, an intermediate member having a first notch part and a second notch part formed on the peripheral edge part, and the third connecting part are connected to each other and connected to the first connecting part through the first notch part. A first moving member that moves in connection with the fourth connecting portion; And a second moving member which moves by being connected to the second connecting portion through-out portion.

  According to the present invention, it is possible to reduce the size of an image blur correction apparatus that drives a plurality of movable members to correct image blur.

1 is an exploded perspective view of an image shake correction apparatus according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view of the image blur correction device of FIG. 1 when viewed from the opposite side. FIG. 2 is a cross-sectional view of the image shake correction apparatus of FIG. 1 cut along a plane parallel to the optical axis. FIG. 4 is a cross-sectional view of the image shake correction apparatus of FIG. 1 cut along a plane that is parallel to the optical axis and orthogonal to the cross section of FIG. 3. It is a figure at the time of seeing the part by which the 1st movable unit is arrange | positioned from an optical axis direction. It is a figure at the time of seeing the part by which the 2nd movable unit is arrange | positioned from an optical axis direction. It is a schematic diagram for demonstrating the effect of this invention by contrasting a comparative example (A) and 1st Embodiment (B). In the image shake correction apparatus according to the second embodiment, it is a diagram when a portion where the first movable unit is arranged is viewed from the optical axis direction.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In each embodiment, an example in which the present invention is applied to an image shake correction apparatus mounted on an imaging apparatus or an optical apparatus will be described. For example, the present invention can be applied to an electronic apparatus including an imaging device such as a digital video camera, a surveillance camera, or a Web camera, or an imaging device such as a mobile phone or a tablet terminal. The present invention can also be applied to an optical device such as an observation device such as an interchangeable lens mounted on a digital single-lens reflex camera, binoculars, a telescope, or a field scope.

[First embodiment]
An image shake correction apparatus according to a first embodiment of the present invention will be described.
First, components constituting the image blur correction apparatus will be described with reference to FIGS. FIG. 1 is an exploded perspective view showing a configuration of an image shake correction apparatus 100 according to the present embodiment. The image blur correction apparatus 100 includes a fixed ground plate 101, a first correction lens 102, and a second correction lens 104. The first movable unit 103 holds the first correction lens 102, and the second movable unit 105 holds the second correction lens 104.

  FIG. 2 is an exploded perspective view of the image blur correction apparatus 100 as viewed from the opposite side in the optical axis direction to FIG. FIG. 3 is a cross-sectional view of the assembled image blur correction apparatus 100 taken along a plane parallel to the optical axis. 4 is a cross-sectional view of the image blur correction apparatus 100 taken along a plane parallel to the optical axis and orthogonal to the cross section of FIG. FIG. 5 is a diagram when the first movable unit 103 is viewed from the optical axis direction. FIG. 6 is a view of the second movable unit 105 as viewed from the side opposite to FIG. 5 in the optical axis direction. In FIGS. 5 and 6, parts are omitted as appropriate for simplification. 1 to 6, the optical axis direction of the first and second correction lenses is the X-axis direction, the direction orthogonal to the X-axis is the Y-axis direction, and the direction orthogonal to the X-axis and the Y-axis is the Z-axis direction. Define.

The first moving member 106 and the second moving member 107 are both substantially annular rotating members. The electromagnetic drive unit includes a first drive unit 108 and a second drive unit 109. The first drive unit 108 includes a first coil 1081, a first magnet 1082, and a first yoke 1083. The second drive unit 109 includes a second coil 1091, a second magnet 1092, and a second yoke 1093. The light amount adjusting unit 110 is disposed between the first movable unit 103 and the second movable unit 105. Each member is disposed in an accommodation space formed by the fixed base plate 101 and the lid 111.
The fixed base plate 101 is formed in a substantially disc shape, and is fixed to a lens barrel that supports another lens group (for example, an imaging optical system). The fixed ground plate 101 has an opening 101a at the center. The fixed ground plate 101 has a first bearing portion 1011 and a second bearing portion 1012 (see FIG. 3). The first bearing portion 1011 has a cylindrical surface that is substantially coaxial with the opening portion 101a, and rotatably supports the first moving member 106. The second bearing portion 1012 has a cylindrical surface that is coaxial with the first bearing portion 1011 and rotatably supports the second moving member 107. The fixed ground plate 101 holds the stator portions (magnet and yoke) of the first drive unit 108 and the second drive unit 109.

  The first correction lens 102 is a movable lens that forms part of the imaging optical system, and is a correction member that decenters the optical axis. The first correction lens 102 is driven and controlled by a drive control unit (not shown). As a result, an image blur correction operation for moving the optical image that has passed through the imaging optical system is performed, and the stability of the image on the imaging surface of the imaging element can be ensured. The first movable unit 103 holds the first correction lens 102 in the central opening. The first movable unit 103 includes four arm portions 1033a to 1033d around the optical axis. Arms 1033a and 1033b are located on opposite sides of the optical axis. Arms 1033c and 1033d provided in a direction orthogonal to these are positioned on opposite sides of the optical axis. The arm portion 1033 a includes a first connecting pin 1031, and the arm portion 1033 b includes a first long hole portion 1032.

  The first connecting pin 1031 protrudes from both sides of the arm portion 1033a in the X-axis direction, and functions as a first connecting portion. The first elongated hole portion 1032 extends along the longitudinal direction of the arm portion 1033b and functions as a second connecting portion. As shown in FIG. 3, the first connecting pin 1031 is fitted in a first guide portion 1101 provided in the light amount adjusting portion 110 and a first cam groove 1061 provided in the first moving member 106. The first elongated hole portion 1032 is fitted with a first drive pin 1071 provided on the second moving member 107. The first elongated hole portion 1032 is designed so that the center of the correction lens 102 and the center of the first connecting pin 1031 are positioned on an extension line in the longitudinal direction.

  The second correction lens 104 is a movable lens that forms part of the imaging optical system, and is a correction member that decenters the optical axis. The second correction lens 104 is driven and controlled by a drive control unit. As a result, an image blur correction operation for moving the optical image that has passed through the imaging optical system is performed, and the stability of the image on the imaging surface of the imaging element can be ensured. In this embodiment, a correction lens is used as the correction member. However, by driving an image pickup device using a CCD (charge coupled device) or the like with respect to the photographing optical system, an image on the image pickup surface is displayed. Stability can be secured. In this case, drive control of the image sensor is performed as a correction member.

  The second movable unit 105 holds the second correction lens 104 in the central opening. The second movable unit 105 includes four arm portions 1053a to 1053d around the optical axis. Arms 1053a and 1053b are located on opposite sides of the optical axis. Arms 1053c and 1053d provided in a direction orthogonal to these are positioned on opposite sides of the optical axis. The arm portion 1053a includes a second connecting pin 1051, and the arm portion 1053b includes a second elongated hole portion 1052. The second connecting pin 1051 protrudes from both sides of the arm portion 1053a in the X-axis direction and functions as a third connecting portion. The second elongated hole portion 1052 extends along the longitudinal direction of the arm portion 1053b and functions as a fourth connecting portion. The distance from the second connecting pin 1051 to the optical axis of the second correction lens 104 is set to be equal to the distance from the first connecting pin 1031 to the optical axis of the first correction lens 102. As shown in FIG. 3, the second connecting pin 1051 is fitted into a second guide portion 1102 provided in the light amount adjusting portion 110 and a second cam groove 1062 provided in the first moving member 106. The second long hole portion 1052 is fitted with a second drive pin 1072 provided on the second moving member 107. The second elongated hole portion 1052 is designed so that the center of the correction lens 104 and the center of the second connecting pin 1051 are positioned on an extension line in the longitudinal direction.

  The first moving member 106 is configured in a cylindrical shape having the X axis as a central axis, and is supported by a first bearing portion 1011 provided on the fixed base plate 101. The first moving member 106 includes a first cam groove 1061 as a first cam portion and a second cam groove 1062 as a second cam portion. The first cam groove 1061 guides the first connecting pin 1031. When the rotation angle of the first moving member 106 is α and the distance from the rotation axis to the central axis of the first cam groove 1061 is Ra, the center line of the first cam groove 1061 is Ra = k1 · α (k1 is a constant) It is a so-called Archimedes spiral shape. A first cam groove 1061 is formed at the tip of the first communication portion 1063 provided on the outer surface of the cylindrical portion of the first moving member 106. The first cam groove 1061 is disposed on the first movable unit 103 side through the arc-shaped first cutout portion 1103 formed in the light amount adjusting unit 110. In addition, although the part which formed the 1st cam groove 1061 is integrated with the 1st moving member 106, in order to ensure assembly property, you may comprise as a different body suitably. In this case, the first cam groove 1061 is integrated with the first moving member 106 by bonding or the like after assembly.

The second cam groove 1062 guides the second connecting pin 1051. When the distance from the rotation axis to the center of the second cam groove 1062 is Rb, the center line of the second cam groove 1062 is expressed as Rb = k 2 · (α + θ) (k 2 and θ are constants). It is a spiral shape. In this embodiment, k1 = k2 and θ = 180 ° are set.
The second moving member 107 is formed in a cylindrical shape having the X axis as a central axis, and is supported by a second bearing portion 1012 provided on the fixed base plate 101. The second moving member 107 includes a first drive pin 1071 that drives the first long hole portion 1032, and a second drive pin 1072 that drives the second long hole portion 1052. The first drive pin 1071 is provided at an end portion of the second communication portion 1073 connected to the outer surface of the cylindrical portion of the second moving member 107 and protrudes in the X-axis direction. The first drive pin 1071 is disposed on the first movable unit 103 side through an arc-shaped notch 1104 formed in the light amount adjusting unit 110. Further, the second drive pin 1072 protrudes from the cylindrical portion of the second moving member 107 in the X-axis direction. The angle formed between the line segment connecting the first drive pin 1071 and the rotation center axis of the second moving member 107 and the line segment connecting the second drive pin 1072 and the rotation center axis of the second moving member 107 is , The above-described θ (180 ° in the present embodiment) is set. Further, the distance from the rotation center axis of the second moving member 107 to the first drive pin 1071 is equal to the distance from the rotation center axis to the second drive pin 1072. In the present embodiment, the first drive pin 1071 is integrated with the first moving member 107, but both members may be configured separately to ensure assemblability. In that case, the portion provided with the first drive pin 1071 is integrated with the second moving member 107 by bonding or the like after assembly.

  The 1st drive part 108 is an actuator which drives the 1st moving member 106, and uses a voice coil motor in this embodiment. The driving principle and type of the first driving unit 108 are not limited. As long as the first moving member 106 can be moved to a predetermined position, a drive unit such as a stepping motor or an ultrasonic motor may be used. As shown in FIG. 4, the first coil 1081 is composed of a conductive wire wound in a spiral shape with an arc that is coaxial with the cylindrical portion of the first moving member 106 as a central axis. The first coil 1081 is fixed to the first moving member 106. The first magnet 1082 has a U-shaped cross-sectional shape so as to surround the first coil 1081 as shown in FIG. The surface of the first magnet 1082 facing the first coil 1081 is magnetized to the S pole, and the outer surface is magnetized to the N pole. The first yoke 1083 includes an inner core portion that passes through the central axis of the first coil 1081 and an outer yoke portion that is formed so as to surround the outer surface of the first magnet 1082. By inserting the first magnet 1082 into the first yoke 1083, a magnetic flux is formed toward the inner core portion disposed on the central axis of the first coil 1081. When the first coil 1081 is energized, a Lorentz force corresponding to this magnetic flux and current is generated, and the first coil 1081 is driven in the circumferential direction (direction perpendicular to the paper surface of FIG. 4).

  The second drive unit 109 is an actuator that drives the second moving member 107. The second drive unit 109 includes a second coil 1091, a second magnet 1092, and a second yoke 1083. Since the second drive unit 109 uses a voice coil motor in the same manner as the first drive unit 108, detailed description thereof is omitted.

  The light amount adjusting unit 110 is an intermediate member fixed to the inner peripheral portion of the fixed base plate 101. For example, a shutter member, a diaphragm mechanism, an ND (Neutral Density) filter, a diaphragm ring, and the like. The light amount adjusting unit 110 adjusts the amount of light passing through by opening and closing a diaphragm blade, a filter, and the like disposed in the center according to a command from the drive control unit. As shown in FIG. 3, the light amount adjusting unit 110 includes a first guide unit 1101 and a second guide unit 1102. The first guide part 1101 has a groove on the side facing the first movable unit 103. This groove extends linearly in the radial direction and guides the first connecting pin 1031. The second guide part 1102 has a groove on the side facing the second movable unit 105. This groove extends linearly in the radial direction and guides the second connecting pin 1051. The angle formed by the first guide part 1101 and the second guide part 1102 in the direction around the X axis is the above-described θ (180 ° in the present embodiment). The light amount adjusting unit 110 has an opening 110a at the center, and has arc-shaped first notch portions 1103 and second notch portions 1104 on peripheral edges located on opposite sides of the X axis.

  The lid 111 is a substantially disc-shaped cover member having an opening 111a at the center. The lid 111 is attached to the fixed ground plate 101 to form an accommodation space. Members such as the first movable unit 103 and the second movable unit 105 are disposed in the accommodation space. Thereby, when an impact force is applied to the image blur correction apparatus 100, or when a posture difference changes, it is possible to prevent the internal components from falling off.

Next, the structure of the image blur correction apparatus 100 and the relationship between each unit will be described. The fixing unit of this embodiment includes a fixed ground plate 101, a light amount adjusting unit 110, and a lid 111. As shown in FIGS. 3 and 4, the first movable unit 103 is disposed in the first space formed by the light amount adjusting unit 110, the lid 111, and the cylindrical surface portion of the fixed base plate 101. A second movable unit 105, a first moving member 106, and a second moving member 107 are arranged in a second space formed by the light amount adjusting unit 110 and the bottom surface portion and the cylindrical surface portion of the fixed ground plate 101.
The first yoke 1083 and the first magnet 1082 constituting the stator of the first drive unit 108 are attached to the fixed ground plate 101. Similarly, the second yoke 1093 and the second magnet 1092 constituting the stator of the second drive unit 109 are attached to the fixed ground plate 101.

The first moving member 106 is rotatably supported by the first bearing portion 1011 of the fixed ground plate 101. The first coil 1081 is attached to the cylindrical portion of the first moving member 106. When the first coil 1081 is energized, the first moving member 106 is driven in the rotational direction about the X axis. Since the first communication unit 1063 is disposed through the first notch 1103 of the light amount adjusting unit 110, interference with the light amount adjusting unit 110 can be avoided. A portion where the first cam groove 1061 is formed is disposed in the first space.
The second moving member 107 is rotatably supported by the second bearing portion 1012 of the fixed ground plate 101. The second coil 1091 is attached to the cylindrical portion of the second moving member 107. By energizing the second coil 1091, the second moving member 107 is driven in the rotation direction about the X axis. Since the second communication portion 1073 is disposed through the second notch portion 1104 of the light amount adjustment unit 110, interference with the light amount adjustment unit 110 can be avoided. The portion where the first drive pin 1071 is formed is disposed in the first space.

  As shown in FIGS. 3 and 4, the position of the second movable unit 105 in the optical axis direction is determined by holding the arm portions 1053 a to 1053 d between the fixed ground plate 101 and the light amount adjusting unit 110. The arm portions 1053a to 1053d are supported so as to be movable in a plane perpendicular to the optical axis in contact with the fixed base plate 101 and the light amount adjusting unit 110 with appropriate friction. The second connecting pin 1051 is guided at the intersection of the second guide portion 1102 and the second cam groove 1062 to determine one point on the plane. The second elongated hole portion 1052 is guided by the second drive pin 1072 to determine the position in the angular direction. Thereby, the position of the second movable unit 105 is uniquely determined.

  As shown in FIGS. 3 and 4, the position of the first movable unit 103 in the optical axis direction is determined by the arm portions 1033 a to 1033 d being held between the light amount adjusting unit 110 and the lid 111. The arm portions 1033a to 1033d are supported so as to be movable in a plane orthogonal to the optical axis in a state where the arm portions 1033a to 1033d are in contact with the light amount adjusting unit 110 and the lid 111 with appropriate friction. The first connecting pin 1031 is guided at the intersection of the first guide part 1101 and the first cam groove 1061, thereby determining one point on the plane. The first elongated hole portion 1032 is guided by the first drive pin 1071 to determine the position in the angular direction. Thereby, the position of the first movable unit 103 is uniquely determined.

Next, positioning and operation of each movable unit will be described with reference to FIGS.
When the first moving member 106 is rotated by the first drive unit 108, the position of the intersection of the first cam groove 1061 and the first guide unit 1101 changes when viewed from the X-axis direction, and the first movable unit 103 is moved. Moving. In FIG. 5, when the first moving member 106 is rotated in the positive direction around the X axis (direction A in FIG. 5), the first correction lens 102 moves in the negative direction on the Y axis (downward in FIG. 5). Since the first cam groove 1061 has an Archimedean spiral shape, the ratio between the rotation amount of the first moving member 106 and the movement amount of the first correction lens 102 is always constant. At this time, the position of the intersection between the second cam groove 1062 and the second guide portion 1102 shown in FIG. 6 also changes at the same time, and the second movable unit 105 moves. In FIG. 6, when the first moving member 106 is rotated in the positive direction around the X axis (direction A in FIG. 6), the second correction lens 104 moves in the positive direction on the Y axis (upward in FIG. 6). Since the second cam groove 1062 has an Archimedean spiral shape, the ratio between the rotation amount of the second moving member 107 and the movement amount of the second correction lens 104 is always constant.

When the second moving member 107 is rotated by the second driving unit 109, a straight line connecting the first connecting pin 1031 and the first long hole portion 1032 rotates with respect to the fixed portion. Accordingly, the first correction lens 102 rotates about the first connecting pin 1031 as a central axis. In FIG. 5, when the second moving member 107 is rotated in the positive direction around the X axis (direction A in FIG. 5), the first movable lens 103 rotates the first correction lens 102 in the tangential direction. Move in the negative direction (left side of FIG. 5). At this time, since the first drive pin 1071 also rotates at the same time, the second correction lens 104 rotates about the second connecting pin 1051 as a central axis. In FIG. 6, when the second moving member 107 is rotated in the positive direction around the X axis (the A direction in FIG. 6), the second movable lens 105 is rotated to move the second correction lens 104 in the tangential direction. Move in the forward direction (left side in FIG. 6).
In this manner, by driving the first moving member 106 and the second moving member 107, the first correction lens 102 and the second correction lens 104 can be moved to predetermined positions in a direction orthogonal to the optical axis. it can.

  Next, the relationship between the moving direction of the first movable unit 103 and the moving direction of the second movable unit 105 will be described. In the present embodiment, the angular phase difference between the first cam groove 1061 and the second cam groove 1062, the angular phase difference between the first drive pin 1071 and the second drive pin 1072, and the first guide part 1101 and the second guide part. The value of θ representing the angular phase difference from 1102 is set to 180 °. That is, the center axis of the first guide part 1101 and the center axis of the second guide part 1102 are both formed in a straight line, and the angle formed by these center axes is 180 °. This angle is an angle formed by a line segment connecting the first elongated hole portion 1032 and the rotation axis of the first moving member 106 and a line segment connecting the second elongated hole portion 1052 and the rotation axis of the second moving member 107. Is equal to When θ = 180 °, the moving direction of the first movable unit 103 and the moving direction of the second movable unit 105 are always opposite.

On the other hand, when the value of θ is 0 °, the moving direction of the first movable unit 103 and the moving direction of the second movable unit 105 are always the same direction. That is, the angle formed by the moving direction of the first movable unit 103 and the moving direction of the second movable unit 105 coincides with the θ value. Thus, the θ value can be set to an arbitrary angle. In the image blur correction apparatus, there are many uses in the case where the moving direction of the first movable unit 103 and the moving direction of the second movable unit 105 are the same direction or the opposite directions. Therefore, the θ value is set to 0 ° and 180 °, respectively.
In this embodiment, the value of k1 that determines the shape of the first cam groove 1061 and the value of k2 that determines the shape of the second cam groove 1062 are set to be the same. Thereby, the absolute value of the movement amount of the first movable unit 103 and the movement amount of the second movable unit 105 when the first moving member 106 is rotated can be made the same. Note that the cam curves of the first cam groove 1061 and the second cam groove 1062 can be formed in different shapes. In this case, the ratio between the movement amount of the first movable unit 103 and the movement amount of the second movable unit 105 can be changed. For example, by changing the k1 value and the k2 value, the ratio of the movement amounts of the first movable unit 103 and the second movable unit 105 can be set to k1 / k2.

In the present embodiment, the distance from the center of the first correction lens 102 to the first connection pin 1031 is equal to the distance from the center of the second correction lens 104 to the second connection pin 1051. Further, the rotation radius of the first drive pin 1071 and the rotation radius of the second drive pin 1072 are equal. Thereby, the absolute value of the movement amount of the 1st movable unit 103 and the movement amount of the 2nd movable unit 105 when rotating the 2nd moving member 107 can be made the same.
On the other hand, a specification for changing the movement amount of the first movable unit 103 and the movement amount of the second movable unit 105 with respect to the rotation of the second moving member 107 is also possible. That is, the distance from the optical axis of the first correction lens 102 to the first connection pin 1031 and the distance to the first drive pin 1071, and the second connection pin 1051 and the second drive pin 1072 from the optical axis of the second correction lens 104. What is necessary is just to change suitably the distance to. Thereby, when the second moving member 107 rotates, the ratio of the moving amount of the first correction lens 102 and the moving amount of the second correction lens 104 can be changed.

  In the present embodiment, the first moving member 106 and the second moving member 107 are arranged coaxially and perform rotational movement. That is, the first driving force by the first driving unit 108 rotates the first moving member 106 and is transmitted to the first and second movable units. In addition, the second driving force by the second driving unit 109 rotates the second moving member 107 and is transmitted to the first and second movable units. The first movable unit and the second movable unit are not limited to such a drive configuration, and the first movable member and the second movable member can be translated in a plane perpendicular to the optical axis with respect to the fixed portion. May be driven.

According to the present embodiment, the following effects can be obtained.
(1) The area of the notch provided in the intermediate member (in this embodiment, the light amount adjusting unit 110) disposed between the two movable units can be reduced.
This effect will be described with reference to FIG. FIG. 7A shows a comparative example, and FIG. 7B is a schematic diagram showing this embodiment.
FIG. 7A is a diagram illustrating a case where the image shake correction apparatus according to the comparative example is cut along a plane orthogonal to the optical axis. Hereinafter, the reason why the area of the notch formed around the portion connecting the plurality of movable members becomes larger in the entire apparatus will be described. The light quantity regulating device 201 is sandwiched between two movable members (movable units), and a movable member 202 is disposed on the inner peripheral side. A movable range (denoted as S) of the movable member 202 indicates a gap between the movable member 202 and the light amount regulating device 201. The communication part 2021 is a part that connects two movable members. In order to avoid the communication part 2021, the light quantity regulating device 201 is provided with a circular notch 2011. Around the communication unit 2021, a space larger than the movable range S is necessary in all directions. The area of the notch 2011 increases in proportion to the square of the length of the movable range S of the movable member 202 (the length in the direction orthogonal to the optical axis). For this reason, when it is desired to increase the movable range S, the proportion of the space of the notch portion 2011 with respect to the light amount regulating device 201 increases, and it is difficult to reduce the diameter of the image blur correction device.
As described above, in order to avoid interference between the communication portion connecting the two movable members and the intermediate member, the intermediate member needs a cutout portion larger than the locus of the communication portion. In the configuration shown in FIG. 7A, the circular area of the notch 2011 increases as the moving amount of the movable unit increases.

  On the other hand, in the present embodiment, the first moving member 106 and the second moving member 107 are provided with communication portions 1063 and 1073, respectively. The communication portions 1063 and 1073 can move only in the rotation direction around the optical axis, and when viewed from the optical axis direction, the areas of the first notches 1103 and 1104 are proportional to the amount of movement of the movable unit. Therefore, even when the amount of movement of the movable unit is increased, the area of the notch only increases in proportion to the first power of the length of the movable range S. As a result, it is possible to reduce the size of the image blur correction apparatus.

(2) The diameter of the image blur correction apparatus can be reduced by the configuration in which the first moving member 106 and the second moving member 107 are rotatably supported by the fixed base plate 101 around the optical axis.
The cutout portions 1103 and 1104 of the intermediate member need to be larger than the trajectories of the communicating portions 1063 and 1073 at the time of movement, but by the configuration for rotatably supporting the first moving member 106 and the second moving member 107, The trajectories of the communication portions 1063 and 1073 are arcuate. Therefore, the shape of the notches 1103 and 1104 is an arc shape centered on the optical axis. The radial width of the notch portion depends only on the shape of the communicating portion and does not depend on the moving distance of the movable member. For this reason, even if the movement amount of the movable member is increased, it is possible to avoid an increase in the diameter of the entire apparatus.

  Further, the notch portion needs to be disposed outside the optical path and inside the apparatus. If the shape of the notch is an arc, it is difficult to create a dead space. Therefore, there is an effect that it is easy to avoid increasing the diameter of the entire apparatus. This effect is particularly effective when the intermediate member is a light amount adjusting device. In the light amount adjusting device, members such as a light amount adjusting blade are often arranged concentrically around the opening, and it is often difficult to provide a notch portion as it approaches the optical axis. Therefore, in the case of a circular notch as shown in FIG. 7A, there is a possibility that the overall diameter of the apparatus is increased. On the other hand, when the notch is arcuate as in the present embodiment, a dead space is unlikely to occur.

(3) Since the first and second movable units can be moved differently, it is possible to perform image blur correction with little decrease in optical performance.
Optimization of optical performance can be achieved by using a plurality of image blur optical systems having different motions.
As described above, according to the present embodiment, it is possible to reduce the size of an image blur correction apparatus that drives a plurality of movable members to correct image blur. Further, in the image blur correction apparatus, it is possible to realize image blur correction with little deterioration in optical performance by changing the moving direction of the plurality of movable members and changing the ratio of the moving amount.

[Second Embodiment]
Next, an image blur correction apparatus according to the second embodiment of the present invention will be described with reference to FIG. In addition, about the component similar to the case of 1st Embodiment, the detailed description is abbreviate | omitted by using the code | symbol already used, and a difference is mainly demonstrated. FIG. 8 is a diagram when the first movable unit 203 is viewed from the optical axis direction. In FIG. 8, parts are appropriately omitted for simplification.
The image shake correction apparatus 200 according to the present embodiment includes a first movable unit 203 that holds the first correction lens 102 and a second movable unit 105 that holds the second correction lens 104. The first drive unit 208 includes a first coil 2081 and a first magnet 2082. The second drive unit 209 includes a second coil 2091 and a second magnet 2092. These members are arranged in a storage space by the fixed base plate 101 and the lid 111 together with other members (the first moving member 106, the second moving member 107, and the light amount adjusting unit 110).

Both the first drive unit 208 and the second drive unit 209 are voice coil motors. As shown in FIG. 8, the first coil 2081 is attached to the first movable unit 203. The second coil 2091 is attached to the first movable unit 203 at an angle phase of 90 ° in the direction around the X axis with respect to the first coil 2081. The first magnet 2082 and the second magnet 2092 are attached to the fixed base plate 101 or the lid 111 constituting the fixing member. The first magnet 2082 and the second magnet 2092 are arranged at an angular phase of 90 ° in the direction around the X axis.
When the first coil 2081 is energized, the first movable unit 203 is driven in the Z-axis direction. Further, the first movable unit 203 is driven in the Y-axis direction by energization of the second coil 2091.

  According to this embodiment, a driving force for moving the first and second movable units is obtained by the first and second driving units. That is, the first driving force by the first driving unit 208 is transmitted from the first movable unit 203 to the first moving member 106 and then to the second movable unit 105 in this order. Further, the second driving force by the second driving unit 209 is transmitted from the first movable unit 203 to the second moving member 107 and then to the second movable unit 105 in this order.

Which configuration to select between the first embodiment and the second embodiment may be determined according to the type and characteristics of the drive unit. In the case of the second embodiment, the first and second moving members act as a speed reduction mechanism with respect to the movable member. Therefore, when the movable unit is directly driven by the drive unit, the amount of movement of the drive unit becomes small. For this reason, the structure shown in 2nd Embodiment can be used with the drive part of a type from which an output falls with the increase in a movement amount. On the other hand, in the case of 1st Embodiment, each drive part rotationally drives the 1st and 2nd moving member which acts as a deceleration mechanism. For this reason, when using a rotary actuator or a low-power actuator, it is advantageous to select the configuration of the first embodiment.
As described above, the present invention is not limited to the configuration exemplified in each of the above embodiments, and the material, shape, dimensions, form, number, arrangement location, and the like can be appropriately changed without departing from the gist of the present invention. is there.

101 Fixed ground plate 102 First correction lens (first correction member)
103 1st movable unit (1st movable member)
1031 1st connection pin (1st connection part)
1032 First long hole (second connecting part)
104 Second correction lens (second correction member)
105 Second movable unit (second movable member)
1051 2nd connection pin (3rd connection part)
1052 Second slot (fourth connecting part)
106 1st moving member 107 2nd moving member 108 1st drive part 109 2nd drive part 110 Light quantity adjustment part (intermediate member)

Claims (14)

An image blur correction apparatus that includes a first correction member and a second correction member, and corrects image blur by moving the first correction member and the second correction member by a driving unit.
A first movable member holding the first correction member and having a first connecting portion and a second connecting portion;
A second movable member holding the second correction member and having a third connecting portion and a fourth connecting portion;
A first guide part disposed between the first movable member and the second movable member, for guiding the first connection part; a second guide part for guiding the second connection part; An intermediate member having a first notch and a second notch;
A first moving member connected to the third connecting portion and connected to the first connecting portion through the first notch and moving;
A second moving member that is connected to the fourth connecting part and is connected to the second connecting part through the second notch and moves;
An image blur correction apparatus comprising: In the intermediate member, the first notch portion is formed along the moving direction of the first moving member, and the second notch portion is formed along the moving direction of the second moving member,
2. The first movable member rotates about the first connecting portion by the movement of the second moving member, and the second movable member rotates about the third connecting portion. The image blur correction device according to 1. The first moving member has a first communication part connected to the first connection part through the first notch part,
3. The image blur correction device according to claim 2, wherein the second moving member includes a second communication portion that is connected to the second connection portion through the second notch portion.   The image blur correction apparatus according to claim 1, wherein the intermediate member is a member that adjusts a light amount.   5. The fixing device according to claim 1, further comprising a fixing member that holds the intermediate member and supports the first moving member and the second moving member so as to be rotatable or translationally movable. The image blur correction apparatus described. A fixing member that rotatably supports the first moving member and the second moving member disposed coaxially;
5. The shape of each of the first notch and the second notch is an arc shape centering on the rotation axes of the first moving member and the second moving member. 2. An image blur correction apparatus according to item 1.   The first moving member has a first cam portion that guides the first connecting portion and a second cam portion that guides the third connecting portion, and the shapes of the first cam portion and the second cam portion are The image blur correction apparatus according to claim 1, wherein the image blur correction apparatus is different.   When viewed from a direction orthogonal to the moving direction of the first movable member and the second movable member, the central axes of the first guide portion and the second guide portion are both formed in a straight line, and the first guide portion The angle formed by the central axis and the central axis of the second guide part is a line segment connecting the second connecting part and the rotation axis of the first moving member, and the fourth connecting part and the second moving member. The image blur correction device according to claim 6, wherein the image blur correction device is equal to an angle formed by a line segment connecting the rotation axis.   When viewed from a direction orthogonal to the moving direction of the first movable member and the second movable member, the angle formed by the central axis of the first guide portion and the central axis of the second guide portion is 0 ° or 180 °. The image blur correction apparatus according to claim 8, wherein the image blur correction apparatus is provided.   The said drive part is provided with the 1st drive part which drives the said 1st moving member, and the 2nd drive part which drives the said 2nd moving member, The any one of Claim 1 thru | or 9 characterized by the above-mentioned. Image shake correction device.   The drive unit includes a first drive unit that drives the first movable member, and a second drive unit that drives the first movable member in a direction different from a direction in which the first drive unit drives. The image blur correction apparatus according to claim 1.   A lens barrel comprising the image blur correction device according to claim 1.   An optical apparatus comprising the image blur correction device according to claim 1. An imaging apparatus comprising the lens barrel according to claim 12.

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